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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Clean ups from Moschip version and a few ioctl implementations by:
4 * Paul B Schroeder <pschroeder "at" uplogix "dot" com>
5 *
6 * Originally based on drivers/usb/serial/io_edgeport.c which is:
7 * Copyright (C) 2000 Inside Out Networks, All rights reserved.
8 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
9 *
10 */
11
12#include <linux/kernel.h>
13#include <linux/errno.h>
14#include <linux/slab.h>
15#include <linux/tty.h>
16#include <linux/tty_driver.h>
17#include <linux/tty_flip.h>
18#include <linux/module.h>
19#include <linux/serial.h>
20#include <linux/usb.h>
21#include <linux/usb/serial.h>
22#include <linux/uaccess.h>
23
24#define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
25
26/*
27 * 16C50 UART register defines
28 */
29
30#define LCR_BITS_5 0x00 /* 5 bits/char */
31#define LCR_BITS_6 0x01 /* 6 bits/char */
32#define LCR_BITS_7 0x02 /* 7 bits/char */
33#define LCR_BITS_8 0x03 /* 8 bits/char */
34#define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
35
36#define LCR_STOP_1 0x00 /* 1 stop bit */
37#define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */
38#define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */
39#define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
40
41#define LCR_PAR_NONE 0x00 /* No parity */
42#define LCR_PAR_ODD 0x08 /* Odd parity */
43#define LCR_PAR_EVEN 0x18 /* Even parity */
44#define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */
45#define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */
46#define LCR_PAR_MASK 0x38 /* Mask for parity field */
47
48#define LCR_SET_BREAK 0x40 /* Set Break condition */
49#define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */
50
51#define MCR_DTR 0x01 /* Assert DTR */
52#define MCR_RTS 0x02 /* Assert RTS */
53#define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */
54#define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */
55#define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */
56#define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */
57
58#define MOS7840_MSR_CTS 0x10 /* Current state of CTS */
59#define MOS7840_MSR_DSR 0x20 /* Current state of DSR */
60#define MOS7840_MSR_RI 0x40 /* Current state of RI */
61#define MOS7840_MSR_CD 0x80 /* Current state of CD */
62
63/*
64 * Defines used for sending commands to port
65 */
66
67#define MOS_WDR_TIMEOUT 5000 /* default urb timeout */
68
69#define MOS_PORT1 0x0200
70#define MOS_PORT2 0x0300
71#define MOS_VENREG 0x0000
72#define MOS_MAX_PORT 0x02
73#define MOS_WRITE 0x0E
74#define MOS_READ 0x0D
75
76/* Requests */
77#define MCS_RD_RTYPE 0xC0
78#define MCS_WR_RTYPE 0x40
79#define MCS_RDREQ 0x0D
80#define MCS_WRREQ 0x0E
81#define MCS_CTRL_TIMEOUT 500
82#define VENDOR_READ_LENGTH (0x01)
83
84#define MAX_NAME_LEN 64
85
86#define ZLP_REG1 0x3A /* Zero_Flag_Reg1 58 */
87#define ZLP_REG5 0x3E /* Zero_Flag_Reg5 62 */
88
89/* For higher baud Rates use TIOCEXBAUD */
90#define TIOCEXBAUD 0x5462
91
92/* vendor id and device id defines */
93
94/* The native mos7840/7820 component */
95#define USB_VENDOR_ID_MOSCHIP 0x9710
96#define MOSCHIP_DEVICE_ID_7840 0x7840
97#define MOSCHIP_DEVICE_ID_7843 0x7843
98#define MOSCHIP_DEVICE_ID_7820 0x7820
99#define MOSCHIP_DEVICE_ID_7810 0x7810
100/* The native component can have its vendor/device id's overridden
101 * in vendor-specific implementations. Such devices can be handled
102 * by making a change here, in id_table.
103 */
104#define USB_VENDOR_ID_BANDB 0x0856
105#define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
106#define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00
107#define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
108#define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01
109#define BANDB_DEVICE_ID_US9ML2_2 0xAC29
110#define BANDB_DEVICE_ID_US9ML2_4 0xAC30
111#define BANDB_DEVICE_ID_USPTL4_2 0xAC31
112#define BANDB_DEVICE_ID_USPTL4_4 0xAC32
113#define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
114#define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02
115#define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
116#define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
117#define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
118
119/* This driver also supports
120 * ATEN UC2324 device using Moschip MCS7840
121 * ATEN UC2322 device using Moschip MCS7820
122 */
123#define USB_VENDOR_ID_ATENINTL 0x0557
124#define ATENINTL_DEVICE_ID_UC2324 0x2011
125#define ATENINTL_DEVICE_ID_UC2322 0x7820
126
127/* Interrupt Routine Defines */
128
129#define SERIAL_IIR_RLS 0x06
130#define SERIAL_IIR_MS 0x00
131
132/*
133 * Emulation of the bit mask on the LINE STATUS REGISTER.
134 */
135#define SERIAL_LSR_DR 0x0001
136#define SERIAL_LSR_OE 0x0002
137#define SERIAL_LSR_PE 0x0004
138#define SERIAL_LSR_FE 0x0008
139#define SERIAL_LSR_BI 0x0010
140
141#define MOS_MSR_DELTA_CTS 0x10
142#define MOS_MSR_DELTA_DSR 0x20
143#define MOS_MSR_DELTA_RI 0x40
144#define MOS_MSR_DELTA_CD 0x80
145
146/* Serial Port register Address */
147#define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
148#define FIFO_CONTROL_REGISTER ((__u16)(0x02))
149#define LINE_CONTROL_REGISTER ((__u16)(0x03))
150#define MODEM_CONTROL_REGISTER ((__u16)(0x04))
151#define LINE_STATUS_REGISTER ((__u16)(0x05))
152#define MODEM_STATUS_REGISTER ((__u16)(0x06))
153#define SCRATCH_PAD_REGISTER ((__u16)(0x07))
154#define DIVISOR_LATCH_LSB ((__u16)(0x00))
155#define DIVISOR_LATCH_MSB ((__u16)(0x01))
156
157#define CLK_MULTI_REGISTER ((__u16)(0x02))
158#define CLK_START_VALUE_REGISTER ((__u16)(0x03))
159#define GPIO_REGISTER ((__u16)(0x07))
160
161#define SERIAL_LCR_DLAB ((__u16)(0x0080))
162
163/*
164 * URB POOL related defines
165 */
166#define NUM_URBS 16 /* URB Count */
167#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
168
169/* LED on/off milliseconds*/
170#define LED_ON_MS 500
171#define LED_OFF_MS 500
172
173enum mos7840_flag {
174 MOS7840_FLAG_CTRL_BUSY,
175 MOS7840_FLAG_LED_BUSY,
176};
177
178static const struct usb_device_id id_table[] = {
179 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
180 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7843)},
181 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
182 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
183 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
184 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
185 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
186 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
187 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
188 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
189 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
190 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
191 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
192 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
193 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
194 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
195 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
196 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
197 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
198 {} /* terminating entry */
199};
200MODULE_DEVICE_TABLE(usb, id_table);
201
202/* This structure holds all of the local port information */
203
204struct moschip_port {
205 int port_num; /*Actual port number in the device(1,2,etc) */
206 struct urb *read_urb; /* read URB for this port */
207 __u8 shadowLCR; /* last LCR value received */
208 __u8 shadowMCR; /* last MCR value received */
209 char open;
210 char open_ports;
211 struct usb_serial_port *port; /* loop back to the owner of this object */
212
213 /* Offsets */
214 __u8 SpRegOffset;
215 __u8 ControlRegOffset;
216 __u8 DcrRegOffset;
217 /* for processing control URBS in interrupt context */
218 struct urb *control_urb;
219 struct usb_ctrlrequest *dr;
220 char *ctrl_buf;
221 int MsrLsr;
222
223 spinlock_t pool_lock;
224 struct urb *write_urb_pool[NUM_URBS];
225 char busy[NUM_URBS];
226 bool read_urb_busy;
227
228 /* For device(s) with LED indicator */
229 bool has_led;
230 struct timer_list led_timer1; /* Timer for LED on */
231 struct timer_list led_timer2; /* Timer for LED off */
232 struct urb *led_urb;
233 struct usb_ctrlrequest *led_dr;
234
235 unsigned long flags;
236};
237
238/*
239 * mos7840_set_reg_sync
240 * To set the Control register by calling usb_fill_control_urb function
241 * by passing usb_sndctrlpipe function as parameter.
242 */
243
244static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
245 __u16 val)
246{
247 struct usb_device *dev = port->serial->dev;
248 val = val & 0x00ff;
249 dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
250
251 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
252 MCS_WR_RTYPE, val, reg, NULL, 0,
253 MOS_WDR_TIMEOUT);
254}
255
256/*
257 * mos7840_get_reg_sync
258 * To set the Uart register by calling usb_fill_control_urb function by
259 * passing usb_rcvctrlpipe function as parameter.
260 */
261
262static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
263 __u16 *val)
264{
265 struct usb_device *dev = port->serial->dev;
266 int ret = 0;
267 u8 *buf;
268
269 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
270 if (!buf)
271 return -ENOMEM;
272
273 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
274 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
275 MOS_WDR_TIMEOUT);
276 if (ret < VENDOR_READ_LENGTH) {
277 if (ret >= 0)
278 ret = -EIO;
279 goto out;
280 }
281
282 *val = buf[0];
283 dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
284out:
285 kfree(buf);
286 return ret;
287}
288
289/*
290 * mos7840_set_uart_reg
291 * To set the Uart register by calling usb_fill_control_urb function by
292 * passing usb_sndctrlpipe function as parameter.
293 */
294
295static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
296 __u16 val)
297{
298
299 struct usb_device *dev = port->serial->dev;
300 val = val & 0x00ff;
301 /* For the UART control registers, the application number need
302 to be Or'ed */
303 if (port->serial->num_ports == 2 && port->port_number != 0)
304 val |= ((__u16)port->port_number + 2) << 8;
305 else
306 val |= ((__u16)port->port_number + 1) << 8;
307 dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
308 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
309 MCS_WR_RTYPE, val, reg, NULL, 0,
310 MOS_WDR_TIMEOUT);
311
312}
313
314/*
315 * mos7840_get_uart_reg
316 * To set the Control register by calling usb_fill_control_urb function
317 * by passing usb_rcvctrlpipe function as parameter.
318 */
319static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
320 __u16 *val)
321{
322 struct usb_device *dev = port->serial->dev;
323 int ret = 0;
324 __u16 Wval;
325 u8 *buf;
326
327 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
328 if (!buf)
329 return -ENOMEM;
330
331 /* Wval is same as application number */
332 if (port->serial->num_ports == 2 && port->port_number != 0)
333 Wval = ((__u16)port->port_number + 2) << 8;
334 else
335 Wval = ((__u16)port->port_number + 1) << 8;
336 dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
337 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
338 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
339 MOS_WDR_TIMEOUT);
340 if (ret < VENDOR_READ_LENGTH) {
341 if (ret >= 0)
342 ret = -EIO;
343 goto out;
344 }
345 *val = buf[0];
346out:
347 kfree(buf);
348 return ret;
349}
350
351static void mos7840_dump_serial_port(struct usb_serial_port *port,
352 struct moschip_port *mos7840_port)
353{
354
355 dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
356 dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
357 dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
358
359}
360
361/************************************************************************/
362/************************************************************************/
363/* I N T E R F A C E F U N C T I O N S */
364/* I N T E R F A C E F U N C T I O N S */
365/************************************************************************/
366/************************************************************************/
367
368static inline void mos7840_set_port_private(struct usb_serial_port *port,
369 struct moschip_port *data)
370{
371 usb_set_serial_port_data(port, (void *)data);
372}
373
374static inline struct moschip_port *mos7840_get_port_private(struct
375 usb_serial_port
376 *port)
377{
378 return (struct moschip_port *)usb_get_serial_port_data(port);
379}
380
381static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
382{
383 struct moschip_port *mos7840_port;
384 struct async_icount *icount;
385 mos7840_port = port;
386 if (new_msr &
387 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
388 MOS_MSR_DELTA_CD)) {
389 icount = &mos7840_port->port->icount;
390
391 /* update input line counters */
392 if (new_msr & MOS_MSR_DELTA_CTS)
393 icount->cts++;
394 if (new_msr & MOS_MSR_DELTA_DSR)
395 icount->dsr++;
396 if (new_msr & MOS_MSR_DELTA_CD)
397 icount->dcd++;
398 if (new_msr & MOS_MSR_DELTA_RI)
399 icount->rng++;
400
401 wake_up_interruptible(&port->port->port.delta_msr_wait);
402 }
403}
404
405static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
406{
407 struct async_icount *icount;
408
409 if (new_lsr & SERIAL_LSR_BI) {
410 /*
411 * Parity and Framing errors only count if they
412 * occur exclusive of a break being
413 * received.
414 */
415 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
416 }
417
418 /* update input line counters */
419 icount = &port->port->icount;
420 if (new_lsr & SERIAL_LSR_BI)
421 icount->brk++;
422 if (new_lsr & SERIAL_LSR_OE)
423 icount->overrun++;
424 if (new_lsr & SERIAL_LSR_PE)
425 icount->parity++;
426 if (new_lsr & SERIAL_LSR_FE)
427 icount->frame++;
428}
429
430/************************************************************************/
431/************************************************************************/
432/* U S B C A L L B A C K F U N C T I O N S */
433/* U S B C A L L B A C K F U N C T I O N S */
434/************************************************************************/
435/************************************************************************/
436
437static void mos7840_control_callback(struct urb *urb)
438{
439 unsigned char *data;
440 struct moschip_port *mos7840_port;
441 struct device *dev = &urb->dev->dev;
442 __u8 regval = 0x0;
443 int status = urb->status;
444
445 mos7840_port = urb->context;
446
447 switch (status) {
448 case 0:
449 /* success */
450 break;
451 case -ECONNRESET:
452 case -ENOENT:
453 case -ESHUTDOWN:
454 /* this urb is terminated, clean up */
455 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
456 goto out;
457 default:
458 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
459 goto out;
460 }
461
462 dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
463 if (urb->actual_length < 1)
464 goto out;
465
466 dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
467 mos7840_port->MsrLsr, mos7840_port->port_num);
468 data = urb->transfer_buffer;
469 regval = (__u8) data[0];
470 dev_dbg(dev, "%s data is %x\n", __func__, regval);
471 if (mos7840_port->MsrLsr == 0)
472 mos7840_handle_new_msr(mos7840_port, regval);
473 else if (mos7840_port->MsrLsr == 1)
474 mos7840_handle_new_lsr(mos7840_port, regval);
475out:
476 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
477}
478
479static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
480 __u16 *val)
481{
482 struct usb_device *dev = mcs->port->serial->dev;
483 struct usb_ctrlrequest *dr = mcs->dr;
484 unsigned char *buffer = mcs->ctrl_buf;
485 int ret;
486
487 if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
488 return -EBUSY;
489
490 dr->bRequestType = MCS_RD_RTYPE;
491 dr->bRequest = MCS_RDREQ;
492 dr->wValue = cpu_to_le16(Wval); /* 0 */
493 dr->wIndex = cpu_to_le16(reg);
494 dr->wLength = cpu_to_le16(2);
495
496 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
497 (unsigned char *)dr, buffer, 2,
498 mos7840_control_callback, mcs);
499 mcs->control_urb->transfer_buffer_length = 2;
500 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
501 if (ret)
502 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
503
504 return ret;
505}
506
507static void mos7840_set_led_callback(struct urb *urb)
508{
509 switch (urb->status) {
510 case 0:
511 /* Success */
512 break;
513 case -ECONNRESET:
514 case -ENOENT:
515 case -ESHUTDOWN:
516 /* This urb is terminated, clean up */
517 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
518 __func__, urb->status);
519 break;
520 default:
521 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
522 __func__, urb->status);
523 }
524}
525
526static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
527 __u16 reg)
528{
529 struct usb_device *dev = mcs->port->serial->dev;
530 struct usb_ctrlrequest *dr = mcs->led_dr;
531
532 dr->bRequestType = MCS_WR_RTYPE;
533 dr->bRequest = MCS_WRREQ;
534 dr->wValue = cpu_to_le16(wval);
535 dr->wIndex = cpu_to_le16(reg);
536 dr->wLength = cpu_to_le16(0);
537
538 usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
539 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
540
541 usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
542}
543
544static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
545 __u16 val)
546{
547 struct usb_device *dev = port->serial->dev;
548
549 usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
550 val, reg, NULL, 0, MOS_WDR_TIMEOUT);
551}
552
553static void mos7840_led_off(struct timer_list *t)
554{
555 struct moschip_port *mcs = from_timer(mcs, t, led_timer1);
556
557 /* Turn off LED */
558 mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
559 mod_timer(&mcs->led_timer2,
560 jiffies + msecs_to_jiffies(LED_OFF_MS));
561}
562
563static void mos7840_led_flag_off(struct timer_list *t)
564{
565 struct moschip_port *mcs = from_timer(mcs, t, led_timer2);
566
567 clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
568}
569
570static void mos7840_led_activity(struct usb_serial_port *port)
571{
572 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
573
574 if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
575 return;
576
577 mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
578 mod_timer(&mos7840_port->led_timer1,
579 jiffies + msecs_to_jiffies(LED_ON_MS));
580}
581
582/*****************************************************************************
583 * mos7840_interrupt_callback
584 * this is the callback function for when we have received data on the
585 * interrupt endpoint.
586 *****************************************************************************/
587
588static void mos7840_interrupt_callback(struct urb *urb)
589{
590 int result;
591 int length;
592 struct moschip_port *mos7840_port;
593 struct usb_serial *serial;
594 __u16 Data;
595 unsigned char *data;
596 __u8 sp[5];
597 int i, rv = 0;
598 __u16 wval, wreg = 0;
599 int status = urb->status;
600
601 switch (status) {
602 case 0:
603 /* success */
604 break;
605 case -ECONNRESET:
606 case -ENOENT:
607 case -ESHUTDOWN:
608 /* this urb is terminated, clean up */
609 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
610 __func__, status);
611 return;
612 default:
613 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
614 __func__, status);
615 goto exit;
616 }
617
618 length = urb->actual_length;
619 data = urb->transfer_buffer;
620
621 serial = urb->context;
622
623 /* Moschip get 5 bytes
624 * Byte 1 IIR Port 1 (port.number is 0)
625 * Byte 2 IIR Port 2 (port.number is 1)
626 * Byte 3 IIR Port 3 (port.number is 2)
627 * Byte 4 IIR Port 4 (port.number is 3)
628 * Byte 5 FIFO status for both */
629
630 if (length > 5) {
631 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
632 return;
633 }
634
635 sp[0] = (__u8) data[0];
636 sp[1] = (__u8) data[1];
637 sp[2] = (__u8) data[2];
638 sp[3] = (__u8) data[3];
639
640 for (i = 0; i < serial->num_ports; i++) {
641 mos7840_port = mos7840_get_port_private(serial->port[i]);
642 wval = ((__u16)serial->port[i]->port_number + 1) << 8;
643 if (mos7840_port->open) {
644 if (sp[i] & 0x01) {
645 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
646 } else {
647 switch (sp[i] & 0x0f) {
648 case SERIAL_IIR_RLS:
649 dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
650 dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
651 mos7840_port->MsrLsr = 1;
652 wreg = LINE_STATUS_REGISTER;
653 break;
654 case SERIAL_IIR_MS:
655 dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
656 mos7840_port->MsrLsr = 0;
657 wreg = MODEM_STATUS_REGISTER;
658 break;
659 }
660 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
661 }
662 }
663 }
664 if (!(rv < 0))
665 /* the completion handler for the control urb will resubmit */
666 return;
667exit:
668 result = usb_submit_urb(urb, GFP_ATOMIC);
669 if (result) {
670 dev_err(&urb->dev->dev,
671 "%s - Error %d submitting interrupt urb\n",
672 __func__, result);
673 }
674}
675
676static int mos7840_port_paranoia_check(struct usb_serial_port *port,
677 const char *function)
678{
679 if (!port) {
680 pr_debug("%s - port == NULL\n", function);
681 return -1;
682 }
683 if (!port->serial) {
684 pr_debug("%s - port->serial == NULL\n", function);
685 return -1;
686 }
687
688 return 0;
689}
690
691/* Inline functions to check the sanity of a pointer that is passed to us */
692static int mos7840_serial_paranoia_check(struct usb_serial *serial,
693 const char *function)
694{
695 if (!serial) {
696 pr_debug("%s - serial == NULL\n", function);
697 return -1;
698 }
699 if (!serial->type) {
700 pr_debug("%s - serial->type == NULL!\n", function);
701 return -1;
702 }
703
704 return 0;
705}
706
707static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
708 const char *function)
709{
710 /* if no port was specified, or it fails a paranoia check */
711 if (!port ||
712 mos7840_port_paranoia_check(port, function) ||
713 mos7840_serial_paranoia_check(port->serial, function)) {
714 /* then say that we don't have a valid usb_serial thing,
715 * which will end up genrating -ENODEV return values */
716 return NULL;
717 }
718
719 return port->serial;
720}
721
722/*****************************************************************************
723 * mos7840_bulk_in_callback
724 * this is the callback function for when we have received data on the
725 * bulk in endpoint.
726 *****************************************************************************/
727
728static void mos7840_bulk_in_callback(struct urb *urb)
729{
730 int retval;
731 unsigned char *data;
732 struct usb_serial *serial;
733 struct usb_serial_port *port;
734 struct moschip_port *mos7840_port;
735 int status = urb->status;
736
737 mos7840_port = urb->context;
738 if (!mos7840_port)
739 return;
740
741 if (status) {
742 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
743 mos7840_port->read_urb_busy = false;
744 return;
745 }
746
747 port = mos7840_port->port;
748 if (mos7840_port_paranoia_check(port, __func__)) {
749 mos7840_port->read_urb_busy = false;
750 return;
751 }
752
753 serial = mos7840_get_usb_serial(port, __func__);
754 if (!serial) {
755 mos7840_port->read_urb_busy = false;
756 return;
757 }
758
759 data = urb->transfer_buffer;
760 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
761
762 if (urb->actual_length) {
763 struct tty_port *tport = &mos7840_port->port->port;
764 tty_insert_flip_string(tport, data, urb->actual_length);
765 tty_flip_buffer_push(tport);
766 port->icount.rx += urb->actual_length;
767 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
768 }
769
770 if (!mos7840_port->read_urb) {
771 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
772 mos7840_port->read_urb_busy = false;
773 return;
774 }
775
776 if (mos7840_port->has_led)
777 mos7840_led_activity(port);
778
779 mos7840_port->read_urb_busy = true;
780 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
781
782 if (retval) {
783 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
784 mos7840_port->read_urb_busy = false;
785 }
786}
787
788/*****************************************************************************
789 * mos7840_bulk_out_data_callback
790 * this is the callback function for when we have finished sending
791 * serial data on the bulk out endpoint.
792 *****************************************************************************/
793
794static void mos7840_bulk_out_data_callback(struct urb *urb)
795{
796 struct moschip_port *mos7840_port;
797 struct usb_serial_port *port;
798 int status = urb->status;
799 unsigned long flags;
800 int i;
801
802 mos7840_port = urb->context;
803 port = mos7840_port->port;
804 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
805 for (i = 0; i < NUM_URBS; i++) {
806 if (urb == mos7840_port->write_urb_pool[i]) {
807 mos7840_port->busy[i] = 0;
808 break;
809 }
810 }
811 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
812
813 if (status) {
814 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
815 return;
816 }
817
818 if (mos7840_port_paranoia_check(port, __func__))
819 return;
820
821 if (mos7840_port->open)
822 tty_port_tty_wakeup(&port->port);
823
824}
825
826/************************************************************************/
827/* D R I V E R T T Y I N T E R F A C E F U N C T I O N S */
828/************************************************************************/
829
830/*****************************************************************************
831 * mos7840_open
832 * this function is called by the tty driver when a port is opened
833 * If successful, we return 0
834 * Otherwise we return a negative error number.
835 *****************************************************************************/
836
837static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
838{
839 int response;
840 int j;
841 struct usb_serial *serial;
842 struct urb *urb;
843 __u16 Data;
844 int status;
845 struct moschip_port *mos7840_port;
846 struct moschip_port *port0;
847
848 if (mos7840_port_paranoia_check(port, __func__))
849 return -ENODEV;
850
851 serial = port->serial;
852
853 if (mos7840_serial_paranoia_check(serial, __func__))
854 return -ENODEV;
855
856 mos7840_port = mos7840_get_port_private(port);
857 port0 = mos7840_get_port_private(serial->port[0]);
858
859 if (mos7840_port == NULL || port0 == NULL)
860 return -ENODEV;
861
862 usb_clear_halt(serial->dev, port->write_urb->pipe);
863 usb_clear_halt(serial->dev, port->read_urb->pipe);
864 port0->open_ports++;
865
866 /* Initialising the write urb pool */
867 for (j = 0; j < NUM_URBS; ++j) {
868 urb = usb_alloc_urb(0, GFP_KERNEL);
869 mos7840_port->write_urb_pool[j] = urb;
870 if (!urb)
871 continue;
872
873 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
874 GFP_KERNEL);
875 if (!urb->transfer_buffer) {
876 usb_free_urb(urb);
877 mos7840_port->write_urb_pool[j] = NULL;
878 continue;
879 }
880 }
881
882/*****************************************************************************
883 * Initialize MCS7840 -- Write Init values to corresponding Registers
884 *
885 * Register Index
886 * 1 : IER
887 * 2 : FCR
888 * 3 : LCR
889 * 4 : MCR
890 *
891 * 0x08 : SP1/2 Control Reg
892 *****************************************************************************/
893
894 /* NEED to check the following Block */
895
896 Data = 0x0;
897 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
898 if (status < 0) {
899 dev_dbg(&port->dev, "Reading Spreg failed\n");
900 goto err;
901 }
902 Data |= 0x80;
903 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
904 if (status < 0) {
905 dev_dbg(&port->dev, "writing Spreg failed\n");
906 goto err;
907 }
908
909 Data &= ~0x80;
910 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
911 if (status < 0) {
912 dev_dbg(&port->dev, "writing Spreg failed\n");
913 goto err;
914 }
915 /* End of block to be checked */
916
917 Data = 0x0;
918 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
919 &Data);
920 if (status < 0) {
921 dev_dbg(&port->dev, "Reading Controlreg failed\n");
922 goto err;
923 }
924 Data |= 0x08; /* Driver done bit */
925 Data |= 0x20; /* rx_disable */
926 status = mos7840_set_reg_sync(port,
927 mos7840_port->ControlRegOffset, Data);
928 if (status < 0) {
929 dev_dbg(&port->dev, "writing Controlreg failed\n");
930 goto err;
931 }
932 /* do register settings here */
933 /* Set all regs to the device default values. */
934 /***********************************
935 * First Disable all interrupts.
936 ***********************************/
937 Data = 0x00;
938 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
939 if (status < 0) {
940 dev_dbg(&port->dev, "disabling interrupts failed\n");
941 goto err;
942 }
943 /* Set FIFO_CONTROL_REGISTER to the default value */
944 Data = 0x00;
945 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
946 if (status < 0) {
947 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
948 goto err;
949 }
950
951 Data = 0xcf;
952 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
953 if (status < 0) {
954 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
955 goto err;
956 }
957
958 Data = 0x03;
959 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
960 mos7840_port->shadowLCR = Data;
961
962 Data = 0x0b;
963 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
964 mos7840_port->shadowMCR = Data;
965
966 Data = 0x00;
967 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
968 mos7840_port->shadowLCR = Data;
969
970 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
971 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
972
973 Data = 0x0c;
974 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
975
976 Data = 0x0;
977 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
978
979 Data = 0x00;
980 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
981
982 Data = Data & ~SERIAL_LCR_DLAB;
983 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
984 mos7840_port->shadowLCR = Data;
985
986 /* clearing Bulkin and Bulkout Fifo */
987 Data = 0x0;
988 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
989
990 Data = Data | 0x0c;
991 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
992
993 Data = Data & ~0x0c;
994 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
995 /* Finally enable all interrupts */
996 Data = 0x0c;
997 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
998
999 /* clearing rx_disable */
1000 Data = 0x0;
1001 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1002 &Data);
1003 Data = Data & ~0x20;
1004 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1005 Data);
1006
1007 /* rx_negate */
1008 Data = 0x0;
1009 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1010 &Data);
1011 Data = Data | 0x10;
1012 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1013 Data);
1014
1015 /* Check to see if we've set up our endpoint info yet *
1016 * (can't set it up in mos7840_startup as the structures *
1017 * were not set up at that time.) */
1018 if (port0->open_ports == 1) {
1019 /* FIXME: Buffer never NULL, so URB is not submitted. */
1020 if (serial->port[0]->interrupt_in_buffer == NULL) {
1021 /* set up interrupt urb */
1022 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1023 serial->dev,
1024 usb_rcvintpipe(serial->dev,
1025 serial->port[0]->interrupt_in_endpointAddress),
1026 serial->port[0]->interrupt_in_buffer,
1027 serial->port[0]->interrupt_in_urb->
1028 transfer_buffer_length,
1029 mos7840_interrupt_callback,
1030 serial,
1031 serial->port[0]->interrupt_in_urb->interval);
1032
1033 /* start interrupt read for mos7840 */
1034 response =
1035 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1036 GFP_KERNEL);
1037 if (response) {
1038 dev_err(&port->dev, "%s - Error %d submitting "
1039 "interrupt urb\n", __func__, response);
1040 }
1041
1042 }
1043
1044 }
1045
1046 /* see if we've set up our endpoint info yet *
1047 * (can't set it up in mos7840_startup as the *
1048 * structures were not set up at that time.) */
1049
1050 dev_dbg(&port->dev, "port number is %d\n", port->port_number);
1051 dev_dbg(&port->dev, "minor number is %d\n", port->minor);
1052 dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1053 dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1054 dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1055 dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1056 mos7840_port->read_urb = port->read_urb;
1057
1058 /* set up our bulk in urb */
1059 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1060 usb_fill_bulk_urb(mos7840_port->read_urb,
1061 serial->dev,
1062 usb_rcvbulkpipe(serial->dev,
1063 (port->bulk_in_endpointAddress) + 2),
1064 port->bulk_in_buffer,
1065 mos7840_port->read_urb->transfer_buffer_length,
1066 mos7840_bulk_in_callback, mos7840_port);
1067 } else {
1068 usb_fill_bulk_urb(mos7840_port->read_urb,
1069 serial->dev,
1070 usb_rcvbulkpipe(serial->dev,
1071 port->bulk_in_endpointAddress),
1072 port->bulk_in_buffer,
1073 mos7840_port->read_urb->transfer_buffer_length,
1074 mos7840_bulk_in_callback, mos7840_port);
1075 }
1076
1077 dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1078 mos7840_port->read_urb_busy = true;
1079 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1080 if (response) {
1081 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1082 __func__, response);
1083 mos7840_port->read_urb_busy = false;
1084 }
1085
1086 /* initialize our port settings */
1087 /* Must set to enable ints! */
1088 mos7840_port->shadowMCR = MCR_MASTER_IE;
1089 /* send a open port command */
1090 mos7840_port->open = 1;
1091 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1092
1093 return 0;
1094err:
1095 for (j = 0; j < NUM_URBS; ++j) {
1096 urb = mos7840_port->write_urb_pool[j];
1097 if (!urb)
1098 continue;
1099 kfree(urb->transfer_buffer);
1100 usb_free_urb(urb);
1101 }
1102 return status;
1103}
1104
1105/*****************************************************************************
1106 * mos7840_chars_in_buffer
1107 * this function is called by the tty driver when it wants to know how many
1108 * bytes of data we currently have outstanding in the port (data that has
1109 * been written, but hasn't made it out the port yet)
1110 * If successful, we return the number of bytes left to be written in the
1111 * system,
1112 * Otherwise we return zero.
1113 *****************************************************************************/
1114
1115static int mos7840_chars_in_buffer(struct tty_struct *tty)
1116{
1117 struct usb_serial_port *port = tty->driver_data;
1118 int i;
1119 int chars = 0;
1120 unsigned long flags;
1121 struct moschip_port *mos7840_port;
1122
1123 if (mos7840_port_paranoia_check(port, __func__))
1124 return 0;
1125
1126 mos7840_port = mos7840_get_port_private(port);
1127 if (mos7840_port == NULL)
1128 return 0;
1129
1130 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1131 for (i = 0; i < NUM_URBS; ++i) {
1132 if (mos7840_port->busy[i]) {
1133 struct urb *urb = mos7840_port->write_urb_pool[i];
1134 chars += urb->transfer_buffer_length;
1135 }
1136 }
1137 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1138 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1139 return chars;
1140
1141}
1142
1143/*****************************************************************************
1144 * mos7840_close
1145 * this function is called by the tty driver when a port is closed
1146 *****************************************************************************/
1147
1148static void mos7840_close(struct usb_serial_port *port)
1149{
1150 struct usb_serial *serial;
1151 struct moschip_port *mos7840_port;
1152 struct moschip_port *port0;
1153 int j;
1154 __u16 Data;
1155
1156 if (mos7840_port_paranoia_check(port, __func__))
1157 return;
1158
1159 serial = mos7840_get_usb_serial(port, __func__);
1160 if (!serial)
1161 return;
1162
1163 mos7840_port = mos7840_get_port_private(port);
1164 port0 = mos7840_get_port_private(serial->port[0]);
1165
1166 if (mos7840_port == NULL || port0 == NULL)
1167 return;
1168
1169 for (j = 0; j < NUM_URBS; ++j)
1170 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1171
1172 /* Freeing Write URBs */
1173 for (j = 0; j < NUM_URBS; ++j) {
1174 if (mos7840_port->write_urb_pool[j]) {
1175 kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
1176 usb_free_urb(mos7840_port->write_urb_pool[j]);
1177 }
1178 }
1179
1180 usb_kill_urb(mos7840_port->read_urb);
1181 mos7840_port->read_urb_busy = false;
1182
1183 port0->open_ports--;
1184 dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
1185 if (port0->open_ports == 0) {
1186 if (serial->port[0]->interrupt_in_urb) {
1187 dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1188 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1189 }
1190 }
1191
1192 Data = 0x0;
1193 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1194
1195 Data = 0x00;
1196 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1197
1198 mos7840_port->open = 0;
1199}
1200
1201/*****************************************************************************
1202 * mos7840_break
1203 * this function sends a break to the port
1204 *****************************************************************************/
1205static void mos7840_break(struct tty_struct *tty, int break_state)
1206{
1207 struct usb_serial_port *port = tty->driver_data;
1208 unsigned char data;
1209 struct usb_serial *serial;
1210 struct moschip_port *mos7840_port;
1211
1212 if (mos7840_port_paranoia_check(port, __func__))
1213 return;
1214
1215 serial = mos7840_get_usb_serial(port, __func__);
1216 if (!serial)
1217 return;
1218
1219 mos7840_port = mos7840_get_port_private(port);
1220
1221 if (mos7840_port == NULL)
1222 return;
1223
1224 if (break_state == -1)
1225 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1226 else
1227 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1228
1229 /* FIXME: no locking on shadowLCR anywhere in driver */
1230 mos7840_port->shadowLCR = data;
1231 dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1232 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1233 mos7840_port->shadowLCR);
1234}
1235
1236/*****************************************************************************
1237 * mos7840_write_room
1238 * this function is called by the tty driver when it wants to know how many
1239 * bytes of data we can accept for a specific port.
1240 * If successful, we return the amount of room that we have for this port
1241 * Otherwise we return a negative error number.
1242 *****************************************************************************/
1243
1244static int mos7840_write_room(struct tty_struct *tty)
1245{
1246 struct usb_serial_port *port = tty->driver_data;
1247 int i;
1248 int room = 0;
1249 unsigned long flags;
1250 struct moschip_port *mos7840_port;
1251
1252 if (mos7840_port_paranoia_check(port, __func__))
1253 return -1;
1254
1255 mos7840_port = mos7840_get_port_private(port);
1256 if (mos7840_port == NULL)
1257 return -1;
1258
1259 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1260 for (i = 0; i < NUM_URBS; ++i) {
1261 if (!mos7840_port->busy[i])
1262 room += URB_TRANSFER_BUFFER_SIZE;
1263 }
1264 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1265
1266 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1267 dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1268 return room;
1269
1270}
1271
1272/*****************************************************************************
1273 * mos7840_write
1274 * this function is called by the tty driver when data should be written to
1275 * the port.
1276 * If successful, we return the number of bytes written, otherwise we
1277 * return a negative error number.
1278 *****************************************************************************/
1279
1280static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1281 const unsigned char *data, int count)
1282{
1283 int status;
1284 int i;
1285 int bytes_sent = 0;
1286 int transfer_size;
1287 unsigned long flags;
1288
1289 struct moschip_port *mos7840_port;
1290 struct usb_serial *serial;
1291 struct urb *urb;
1292 /* __u16 Data; */
1293 const unsigned char *current_position = data;
1294
1295 if (mos7840_port_paranoia_check(port, __func__))
1296 return -1;
1297
1298 serial = port->serial;
1299 if (mos7840_serial_paranoia_check(serial, __func__))
1300 return -1;
1301
1302 mos7840_port = mos7840_get_port_private(port);
1303 if (mos7840_port == NULL)
1304 return -1;
1305
1306 /* try to find a free urb in the list */
1307 urb = NULL;
1308
1309 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1310 for (i = 0; i < NUM_URBS; ++i) {
1311 if (!mos7840_port->busy[i]) {
1312 mos7840_port->busy[i] = 1;
1313 urb = mos7840_port->write_urb_pool[i];
1314 dev_dbg(&port->dev, "URB:%d\n", i);
1315 break;
1316 }
1317 }
1318 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1319
1320 if (urb == NULL) {
1321 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1322 goto exit;
1323 }
1324
1325 if (urb->transfer_buffer == NULL) {
1326 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
1327 GFP_ATOMIC);
1328 if (!urb->transfer_buffer)
1329 goto exit;
1330 }
1331 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1332
1333 memcpy(urb->transfer_buffer, current_position, transfer_size);
1334
1335 /* fill urb with data and submit */
1336 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1337 usb_fill_bulk_urb(urb,
1338 serial->dev,
1339 usb_sndbulkpipe(serial->dev,
1340 (port->bulk_out_endpointAddress) + 2),
1341 urb->transfer_buffer,
1342 transfer_size,
1343 mos7840_bulk_out_data_callback, mos7840_port);
1344 } else {
1345 usb_fill_bulk_urb(urb,
1346 serial->dev,
1347 usb_sndbulkpipe(serial->dev,
1348 port->bulk_out_endpointAddress),
1349 urb->transfer_buffer,
1350 transfer_size,
1351 mos7840_bulk_out_data_callback, mos7840_port);
1352 }
1353
1354 dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1355
1356 if (mos7840_port->has_led)
1357 mos7840_led_activity(port);
1358
1359 /* send it down the pipe */
1360 status = usb_submit_urb(urb, GFP_ATOMIC);
1361
1362 if (status) {
1363 mos7840_port->busy[i] = 0;
1364 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1365 "with status = %d\n", __func__, status);
1366 bytes_sent = status;
1367 goto exit;
1368 }
1369 bytes_sent = transfer_size;
1370 port->icount.tx += transfer_size;
1371 dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
1372exit:
1373 return bytes_sent;
1374
1375}
1376
1377/*****************************************************************************
1378 * mos7840_throttle
1379 * this function is called by the tty driver when it wants to stop the data
1380 * being read from the port.
1381 *****************************************************************************/
1382
1383static void mos7840_throttle(struct tty_struct *tty)
1384{
1385 struct usb_serial_port *port = tty->driver_data;
1386 struct moschip_port *mos7840_port;
1387 int status;
1388
1389 if (mos7840_port_paranoia_check(port, __func__))
1390 return;
1391
1392 mos7840_port = mos7840_get_port_private(port);
1393
1394 if (mos7840_port == NULL)
1395 return;
1396
1397 if (!mos7840_port->open) {
1398 dev_dbg(&port->dev, "%s", "port not opened\n");
1399 return;
1400 }
1401
1402 /* if we are implementing XON/XOFF, send the stop character */
1403 if (I_IXOFF(tty)) {
1404 unsigned char stop_char = STOP_CHAR(tty);
1405 status = mos7840_write(tty, port, &stop_char, 1);
1406 if (status <= 0)
1407 return;
1408 }
1409 /* if we are implementing RTS/CTS, toggle that line */
1410 if (C_CRTSCTS(tty)) {
1411 mos7840_port->shadowMCR &= ~MCR_RTS;
1412 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1413 mos7840_port->shadowMCR);
1414 if (status < 0)
1415 return;
1416 }
1417}
1418
1419/*****************************************************************************
1420 * mos7840_unthrottle
1421 * this function is called by the tty driver when it wants to resume
1422 * the data being read from the port (called after mos7840_throttle is
1423 * called)
1424 *****************************************************************************/
1425static void mos7840_unthrottle(struct tty_struct *tty)
1426{
1427 struct usb_serial_port *port = tty->driver_data;
1428 int status;
1429 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1430
1431 if (mos7840_port_paranoia_check(port, __func__))
1432 return;
1433
1434 if (mos7840_port == NULL)
1435 return;
1436
1437 if (!mos7840_port->open) {
1438 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1439 return;
1440 }
1441
1442 /* if we are implementing XON/XOFF, send the start character */
1443 if (I_IXOFF(tty)) {
1444 unsigned char start_char = START_CHAR(tty);
1445 status = mos7840_write(tty, port, &start_char, 1);
1446 if (status <= 0)
1447 return;
1448 }
1449
1450 /* if we are implementing RTS/CTS, toggle that line */
1451 if (C_CRTSCTS(tty)) {
1452 mos7840_port->shadowMCR |= MCR_RTS;
1453 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1454 mos7840_port->shadowMCR);
1455 if (status < 0)
1456 return;
1457 }
1458}
1459
1460static int mos7840_tiocmget(struct tty_struct *tty)
1461{
1462 struct usb_serial_port *port = tty->driver_data;
1463 struct moschip_port *mos7840_port;
1464 unsigned int result;
1465 __u16 msr;
1466 __u16 mcr;
1467 int status;
1468 mos7840_port = mos7840_get_port_private(port);
1469
1470 if (mos7840_port == NULL)
1471 return -ENODEV;
1472
1473 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1474 if (status < 0)
1475 return -EIO;
1476 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1477 if (status < 0)
1478 return -EIO;
1479 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1480 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1481 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1482 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1483 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1484 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1485 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1486
1487 dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1488
1489 return result;
1490}
1491
1492static int mos7840_tiocmset(struct tty_struct *tty,
1493 unsigned int set, unsigned int clear)
1494{
1495 struct usb_serial_port *port = tty->driver_data;
1496 struct moschip_port *mos7840_port;
1497 unsigned int mcr;
1498 int status;
1499
1500 mos7840_port = mos7840_get_port_private(port);
1501
1502 if (mos7840_port == NULL)
1503 return -ENODEV;
1504
1505 /* FIXME: What locks the port registers ? */
1506 mcr = mos7840_port->shadowMCR;
1507 if (clear & TIOCM_RTS)
1508 mcr &= ~MCR_RTS;
1509 if (clear & TIOCM_DTR)
1510 mcr &= ~MCR_DTR;
1511 if (clear & TIOCM_LOOP)
1512 mcr &= ~MCR_LOOPBACK;
1513
1514 if (set & TIOCM_RTS)
1515 mcr |= MCR_RTS;
1516 if (set & TIOCM_DTR)
1517 mcr |= MCR_DTR;
1518 if (set & TIOCM_LOOP)
1519 mcr |= MCR_LOOPBACK;
1520
1521 mos7840_port->shadowMCR = mcr;
1522
1523 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1524 if (status < 0) {
1525 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1526 return status;
1527 }
1528
1529 return 0;
1530}
1531
1532/*****************************************************************************
1533 * mos7840_calc_baud_rate_divisor
1534 * this function calculates the proper baud rate divisor for the specified
1535 * baud rate.
1536 *****************************************************************************/
1537static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1538 int baudRate, int *divisor,
1539 __u16 *clk_sel_val)
1540{
1541 dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1542
1543 if (baudRate <= 115200) {
1544 *divisor = 115200 / baudRate;
1545 *clk_sel_val = 0x0;
1546 }
1547 if ((baudRate > 115200) && (baudRate <= 230400)) {
1548 *divisor = 230400 / baudRate;
1549 *clk_sel_val = 0x10;
1550 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1551 *divisor = 403200 / baudRate;
1552 *clk_sel_val = 0x20;
1553 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1554 *divisor = 460800 / baudRate;
1555 *clk_sel_val = 0x30;
1556 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1557 *divisor = 806400 / baudRate;
1558 *clk_sel_val = 0x40;
1559 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1560 *divisor = 921600 / baudRate;
1561 *clk_sel_val = 0x50;
1562 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1563 *divisor = 1572864 / baudRate;
1564 *clk_sel_val = 0x60;
1565 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1566 *divisor = 3145728 / baudRate;
1567 *clk_sel_val = 0x70;
1568 }
1569 return 0;
1570}
1571
1572/*****************************************************************************
1573 * mos7840_send_cmd_write_baud_rate
1574 * this function sends the proper command to change the baud rate of the
1575 * specified port.
1576 *****************************************************************************/
1577
1578static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1579 int baudRate)
1580{
1581 int divisor = 0;
1582 int status;
1583 __u16 Data;
1584 __u16 clk_sel_val;
1585 struct usb_serial_port *port;
1586
1587 if (mos7840_port == NULL)
1588 return -1;
1589
1590 port = mos7840_port->port;
1591 if (mos7840_port_paranoia_check(port, __func__))
1592 return -1;
1593
1594 if (mos7840_serial_paranoia_check(port->serial, __func__))
1595 return -1;
1596
1597 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1598 /* reset clk_uart_sel in spregOffset */
1599 if (baudRate > 115200) {
1600#ifdef HW_flow_control
1601 /* NOTE: need to see the pther register to modify */
1602 /* setting h/w flow control bit to 1 */
1603 Data = 0x2b;
1604 mos7840_port->shadowMCR = Data;
1605 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1606 Data);
1607 if (status < 0) {
1608 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1609 return -1;
1610 }
1611#endif
1612
1613 } else {
1614#ifdef HW_flow_control
1615 /* setting h/w flow control bit to 0 */
1616 Data = 0xb;
1617 mos7840_port->shadowMCR = Data;
1618 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1619 Data);
1620 if (status < 0) {
1621 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1622 return -1;
1623 }
1624#endif
1625
1626 }
1627
1628 if (1) { /* baudRate <= 115200) */
1629 clk_sel_val = 0x0;
1630 Data = 0x0;
1631 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1632 &clk_sel_val);
1633 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1634 &Data);
1635 if (status < 0) {
1636 dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1637 return -1;
1638 }
1639 Data = (Data & 0x8f) | clk_sel_val;
1640 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1641 Data);
1642 if (status < 0) {
1643 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1644 return -1;
1645 }
1646 /* Calculate the Divisor */
1647
1648 if (status) {
1649 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1650 return status;
1651 }
1652 /* Enable access to divisor latch */
1653 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1654 mos7840_port->shadowLCR = Data;
1655 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1656
1657 /* Write the divisor */
1658 Data = (unsigned char)(divisor & 0xff);
1659 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1660 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1661
1662 Data = (unsigned char)((divisor & 0xff00) >> 8);
1663 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1664 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1665
1666 /* Disable access to divisor latch */
1667 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1668 mos7840_port->shadowLCR = Data;
1669 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1670
1671 }
1672 return status;
1673}
1674
1675/*****************************************************************************
1676 * mos7840_change_port_settings
1677 * This routine is called to set the UART on the device to match
1678 * the specified new settings.
1679 *****************************************************************************/
1680
1681static void mos7840_change_port_settings(struct tty_struct *tty,
1682 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1683{
1684 int baud;
1685 unsigned cflag;
1686 __u8 lData;
1687 __u8 lParity;
1688 __u8 lStop;
1689 int status;
1690 __u16 Data;
1691 struct usb_serial_port *port;
1692
1693 if (mos7840_port == NULL)
1694 return;
1695
1696 port = mos7840_port->port;
1697
1698 if (mos7840_port_paranoia_check(port, __func__))
1699 return;
1700
1701 if (mos7840_serial_paranoia_check(port->serial, __func__))
1702 return;
1703
1704 if (!mos7840_port->open) {
1705 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1706 return;
1707 }
1708
1709 lData = LCR_BITS_8;
1710 lStop = LCR_STOP_1;
1711 lParity = LCR_PAR_NONE;
1712
1713 cflag = tty->termios.c_cflag;
1714
1715 /* Change the number of bits */
1716 switch (cflag & CSIZE) {
1717 case CS5:
1718 lData = LCR_BITS_5;
1719 break;
1720
1721 case CS6:
1722 lData = LCR_BITS_6;
1723 break;
1724
1725 case CS7:
1726 lData = LCR_BITS_7;
1727 break;
1728
1729 default:
1730 case CS8:
1731 lData = LCR_BITS_8;
1732 break;
1733 }
1734
1735 /* Change the Parity bit */
1736 if (cflag & PARENB) {
1737 if (cflag & PARODD) {
1738 lParity = LCR_PAR_ODD;
1739 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1740 } else {
1741 lParity = LCR_PAR_EVEN;
1742 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1743 }
1744
1745 } else {
1746 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1747 }
1748
1749 if (cflag & CMSPAR)
1750 lParity = lParity | 0x20;
1751
1752 /* Change the Stop bit */
1753 if (cflag & CSTOPB) {
1754 lStop = LCR_STOP_2;
1755 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1756 } else {
1757 lStop = LCR_STOP_1;
1758 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1759 }
1760
1761 /* Update the LCR with the correct value */
1762 mos7840_port->shadowLCR &=
1763 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1764 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1765
1766 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1767 mos7840_port->shadowLCR);
1768 /* Disable Interrupts */
1769 Data = 0x00;
1770 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1771
1772 Data = 0x00;
1773 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1774
1775 Data = 0xcf;
1776 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1777
1778 /* Send the updated LCR value to the mos7840 */
1779 Data = mos7840_port->shadowLCR;
1780
1781 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1782
1783 Data = 0x00b;
1784 mos7840_port->shadowMCR = Data;
1785 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1786 Data = 0x00b;
1787 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1788
1789 /* set up the MCR register and send it to the mos7840 */
1790
1791 mos7840_port->shadowMCR = MCR_MASTER_IE;
1792 if (cflag & CBAUD)
1793 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1794
1795 if (cflag & CRTSCTS)
1796 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1797 else
1798 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1799
1800 Data = mos7840_port->shadowMCR;
1801 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1802
1803 /* Determine divisor based on baud rate */
1804 baud = tty_get_baud_rate(tty);
1805
1806 if (!baud) {
1807 /* pick a default, any default... */
1808 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1809 baud = 9600;
1810 }
1811
1812 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1813 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1814
1815 /* Enable Interrupts */
1816 Data = 0x0c;
1817 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1818
1819 if (!mos7840_port->read_urb_busy) {
1820 mos7840_port->read_urb_busy = true;
1821 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1822 if (status) {
1823 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1824 status);
1825 mos7840_port->read_urb_busy = false;
1826 }
1827 }
1828 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1829 mos7840_port->shadowLCR);
1830}
1831
1832/*****************************************************************************
1833 * mos7840_set_termios
1834 * this function is called by the tty driver when it wants to change
1835 * the termios structure
1836 *****************************************************************************/
1837
1838static void mos7840_set_termios(struct tty_struct *tty,
1839 struct usb_serial_port *port,
1840 struct ktermios *old_termios)
1841{
1842 int status;
1843 struct usb_serial *serial;
1844 struct moschip_port *mos7840_port;
1845
1846 if (mos7840_port_paranoia_check(port, __func__))
1847 return;
1848
1849 serial = port->serial;
1850
1851 if (mos7840_serial_paranoia_check(serial, __func__))
1852 return;
1853
1854 mos7840_port = mos7840_get_port_private(port);
1855
1856 if (mos7840_port == NULL)
1857 return;
1858
1859 if (!mos7840_port->open) {
1860 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1861 return;
1862 }
1863
1864 /* change the port settings to the new ones specified */
1865
1866 mos7840_change_port_settings(tty, mos7840_port, old_termios);
1867
1868 if (!mos7840_port->read_urb) {
1869 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
1870 return;
1871 }
1872
1873 if (!mos7840_port->read_urb_busy) {
1874 mos7840_port->read_urb_busy = true;
1875 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1876 if (status) {
1877 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1878 status);
1879 mos7840_port->read_urb_busy = false;
1880 }
1881 }
1882}
1883
1884/*****************************************************************************
1885 * mos7840_get_lsr_info - get line status register info
1886 *
1887 * Purpose: Let user call ioctl() to get info when the UART physically
1888 * is emptied. On bus types like RS485, the transmitter must
1889 * release the bus after transmitting. This must be done when
1890 * the transmit shift register is empty, not be done when the
1891 * transmit holding register is empty. This functionality
1892 * allows an RS485 driver to be written in user space.
1893 *****************************************************************************/
1894
1895static int mos7840_get_lsr_info(struct tty_struct *tty,
1896 unsigned int __user *value)
1897{
1898 int count;
1899 unsigned int result = 0;
1900
1901 count = mos7840_chars_in_buffer(tty);
1902 if (count == 0)
1903 result = TIOCSER_TEMT;
1904
1905 if (copy_to_user(value, &result, sizeof(int)))
1906 return -EFAULT;
1907 return 0;
1908}
1909
1910/*****************************************************************************
1911 * mos7840_get_serial_info
1912 * function to get information about serial port
1913 *****************************************************************************/
1914
1915static int mos7840_get_serial_info(struct tty_struct *tty,
1916 struct serial_struct *ss)
1917{
1918 struct usb_serial_port *port = tty->driver_data;
1919 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1920
1921 ss->type = PORT_16550A;
1922 ss->line = mos7840_port->port->minor;
1923 ss->port = mos7840_port->port->port_number;
1924 ss->irq = 0;
1925 ss->xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1926 ss->baud_base = 9600;
1927 ss->close_delay = 5 * HZ;
1928 ss->closing_wait = 30 * HZ;
1929 return 0;
1930}
1931
1932/*****************************************************************************
1933 * SerialIoctl
1934 * this function handles any ioctl calls to the driver
1935 *****************************************************************************/
1936
1937static int mos7840_ioctl(struct tty_struct *tty,
1938 unsigned int cmd, unsigned long arg)
1939{
1940 struct usb_serial_port *port = tty->driver_data;
1941 void __user *argp = (void __user *)arg;
1942 struct moschip_port *mos7840_port;
1943
1944 if (mos7840_port_paranoia_check(port, __func__))
1945 return -1;
1946
1947 mos7840_port = mos7840_get_port_private(port);
1948
1949 if (mos7840_port == NULL)
1950 return -1;
1951
1952 switch (cmd) {
1953 /* return number of bytes available */
1954
1955 case TIOCSERGETLSR:
1956 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1957 return mos7840_get_lsr_info(tty, argp);
1958
1959 default:
1960 break;
1961 }
1962 return -ENOIOCTLCMD;
1963}
1964
1965static int mos7810_check(struct usb_serial *serial)
1966{
1967 int i, pass_count = 0;
1968 u8 *buf;
1969 __u16 data = 0, mcr_data = 0;
1970 __u16 test_pattern = 0x55AA;
1971 int res;
1972
1973 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
1974 if (!buf)
1975 return 0; /* failed to identify 7810 */
1976
1977 /* Store MCR setting */
1978 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1979 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
1980 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1981 if (res == VENDOR_READ_LENGTH)
1982 mcr_data = *buf;
1983
1984 for (i = 0; i < 16; i++) {
1985 /* Send the 1-bit test pattern out to MCS7810 test pin */
1986 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1987 MCS_WRREQ, MCS_WR_RTYPE,
1988 (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
1989 MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
1990
1991 /* Read the test pattern back */
1992 res = usb_control_msg(serial->dev,
1993 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
1994 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
1995 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1996 if (res == VENDOR_READ_LENGTH)
1997 data = *buf;
1998
1999 /* If this is a MCS7810 device, both test patterns must match */
2000 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2001 break;
2002
2003 pass_count++;
2004 }
2005
2006 /* Restore MCR setting */
2007 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2008 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2009 0, MOS_WDR_TIMEOUT);
2010
2011 kfree(buf);
2012
2013 if (pass_count == 16)
2014 return 1;
2015
2016 return 0;
2017}
2018
2019static int mos7840_probe(struct usb_serial *serial,
2020 const struct usb_device_id *id)
2021{
2022 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2023 u8 *buf;
2024 int device_type;
2025
2026 if (product == MOSCHIP_DEVICE_ID_7810 ||
2027 product == MOSCHIP_DEVICE_ID_7820 ||
2028 product == MOSCHIP_DEVICE_ID_7843) {
2029 device_type = product;
2030 goto out;
2031 }
2032
2033 buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2034 if (!buf)
2035 return -ENOMEM;
2036
2037 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2038 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2039 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2040
2041 /* For a MCS7840 device GPIO0 must be set to 1 */
2042 if (buf[0] & 0x01)
2043 device_type = MOSCHIP_DEVICE_ID_7840;
2044 else if (mos7810_check(serial))
2045 device_type = MOSCHIP_DEVICE_ID_7810;
2046 else
2047 device_type = MOSCHIP_DEVICE_ID_7820;
2048
2049 kfree(buf);
2050out:
2051 usb_set_serial_data(serial, (void *)(unsigned long)device_type);
2052
2053 return 0;
2054}
2055
2056static int mos7840_calc_num_ports(struct usb_serial *serial,
2057 struct usb_serial_endpoints *epds)
2058{
2059 int device_type = (unsigned long)usb_get_serial_data(serial);
2060 int num_ports;
2061
2062 if (device_type == MOSCHIP_DEVICE_ID_7843)
2063 num_ports = 3;
2064 else
2065 num_ports = (device_type >> 4) & 0x000F;
2066
2067 /*
2068 * num_ports is currently never zero as device_type is one of
2069 * MOSCHIP_DEVICE_ID_78{1,2,4}0.
2070 */
2071 if (num_ports == 0)
2072 return -ENODEV;
2073
2074 if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) {
2075 dev_err(&serial->interface->dev, "missing endpoints\n");
2076 return -ENODEV;
2077 }
2078
2079 return num_ports;
2080}
2081
2082static int mos7840_port_probe(struct usb_serial_port *port)
2083{
2084 struct usb_serial *serial = port->serial;
2085 int device_type = (unsigned long)usb_get_serial_data(serial);
2086 struct moschip_port *mos7840_port;
2087 int status;
2088 int pnum;
2089 __u16 Data;
2090
2091 /* we set up the pointers to the endpoints in the mos7840_open *
2092 * function, as the structures aren't created yet. */
2093
2094 pnum = port->port_number;
2095
2096 dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2097 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2098 if (!mos7840_port)
2099 return -ENOMEM;
2100
2101 /* Initialize all port interrupt end point to port 0 int
2102 * endpoint. Our device has only one interrupt end point
2103 * common to all port */
2104
2105 mos7840_port->port = port;
2106 mos7840_set_port_private(port, mos7840_port);
2107 spin_lock_init(&mos7840_port->pool_lock);
2108
2109 /* minor is not initialised until later by
2110 * usb-serial.c:get_free_serial() and cannot therefore be used
2111 * to index device instances */
2112 mos7840_port->port_num = pnum + 1;
2113 dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
2114 dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2115
2116 if (mos7840_port->port_num == 1) {
2117 mos7840_port->SpRegOffset = 0x0;
2118 mos7840_port->ControlRegOffset = 0x1;
2119 mos7840_port->DcrRegOffset = 0x4;
2120 } else {
2121 u8 phy_num = mos7840_port->port_num;
2122
2123 /* Port 2 in the 2-port case uses registers of port 3 */
2124 if (serial->num_ports == 2)
2125 phy_num = 3;
2126
2127 mos7840_port->SpRegOffset = 0x8 + 2 * (phy_num - 2);
2128 mos7840_port->ControlRegOffset = 0x9 + 2 * (phy_num - 2);
2129 mos7840_port->DcrRegOffset = 0x16 + 3 * (phy_num - 2);
2130 }
2131 mos7840_dump_serial_port(port, mos7840_port);
2132 mos7840_set_port_private(port, mos7840_port);
2133
2134 /* enable rx_disable bit in control register */
2135 status = mos7840_get_reg_sync(port,
2136 mos7840_port->ControlRegOffset, &Data);
2137 if (status < 0) {
2138 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2139 goto out;
2140 } else
2141 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2142 Data |= 0x08; /* setting driver done bit */
2143 Data |= 0x04; /* sp1_bit to have cts change reflect in
2144 modem status reg */
2145
2146 /* Data |= 0x20; //rx_disable bit */
2147 status = mos7840_set_reg_sync(port,
2148 mos7840_port->ControlRegOffset, Data);
2149 if (status < 0) {
2150 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2151 goto out;
2152 } else
2153 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2154
2155 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2156 and 0x24 in DCR3 */
2157 Data = 0x01;
2158 status = mos7840_set_reg_sync(port,
2159 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2160 if (status < 0) {
2161 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2162 goto out;
2163 } else
2164 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2165
2166 Data = 0x05;
2167 status = mos7840_set_reg_sync(port,
2168 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2169 if (status < 0) {
2170 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2171 goto out;
2172 } else
2173 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2174
2175 Data = 0x24;
2176 status = mos7840_set_reg_sync(port,
2177 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2178 if (status < 0) {
2179 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2180 goto out;
2181 } else
2182 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2183
2184 /* write values in clkstart0x0 and clkmulti 0x20 */
2185 Data = 0x0;
2186 status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2187 if (status < 0) {
2188 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2189 goto out;
2190 } else
2191 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2192
2193 Data = 0x20;
2194 status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2195 if (status < 0) {
2196 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2197 goto error;
2198 } else
2199 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2200
2201 /* write value 0x0 to scratchpad register */
2202 Data = 0x00;
2203 status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2204 if (status < 0) {
2205 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2206 goto out;
2207 } else
2208 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2209
2210 /* Zero Length flag register */
2211 if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2212 Data = 0xff;
2213 status = mos7840_set_reg_sync(port,
2214 (__u16) (ZLP_REG1 +
2215 ((__u16)mos7840_port->port_num)), Data);
2216 dev_dbg(&port->dev, "ZLIP offset %x\n",
2217 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2218 if (status < 0) {
2219 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2220 goto out;
2221 } else
2222 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2223 } else {
2224 Data = 0xff;
2225 status = mos7840_set_reg_sync(port,
2226 (__u16) (ZLP_REG1 +
2227 ((__u16)mos7840_port->port_num) - 0x1), Data);
2228 dev_dbg(&port->dev, "ZLIP offset %x\n",
2229 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2230 if (status < 0) {
2231 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2232 goto out;
2233 } else
2234 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2235
2236 }
2237 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2238 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2239 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2240 GFP_KERNEL);
2241 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2242 !mos7840_port->dr) {
2243 status = -ENOMEM;
2244 goto error;
2245 }
2246
2247 mos7840_port->has_led = false;
2248
2249 /* Initialize LED timers */
2250 if (device_type == MOSCHIP_DEVICE_ID_7810) {
2251 mos7840_port->has_led = true;
2252
2253 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
2254 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
2255 GFP_KERNEL);
2256 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
2257 status = -ENOMEM;
2258 goto error;
2259 }
2260
2261 timer_setup(&mos7840_port->led_timer1, mos7840_led_off, 0);
2262 mos7840_port->led_timer1.expires =
2263 jiffies + msecs_to_jiffies(LED_ON_MS);
2264 timer_setup(&mos7840_port->led_timer2, mos7840_led_flag_off,
2265 0);
2266 mos7840_port->led_timer2.expires =
2267 jiffies + msecs_to_jiffies(LED_OFF_MS);
2268
2269 /* Turn off LED */
2270 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2271 }
2272out:
2273 if (pnum == serial->num_ports - 1) {
2274 /* Zero Length flag enable */
2275 Data = 0x0f;
2276 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2277 if (status < 0) {
2278 dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2279 goto error;
2280 } else
2281 dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2282
2283 /* setting configuration feature to one */
2284 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2285 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2286 MOS_WDR_TIMEOUT);
2287 }
2288 return 0;
2289error:
2290 kfree(mos7840_port->led_dr);
2291 usb_free_urb(mos7840_port->led_urb);
2292 kfree(mos7840_port->dr);
2293 kfree(mos7840_port->ctrl_buf);
2294 usb_free_urb(mos7840_port->control_urb);
2295 kfree(mos7840_port);
2296
2297 return status;
2298}
2299
2300static int mos7840_port_remove(struct usb_serial_port *port)
2301{
2302 struct moschip_port *mos7840_port;
2303
2304 mos7840_port = mos7840_get_port_private(port);
2305
2306 if (mos7840_port->has_led) {
2307 /* Turn off LED */
2308 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2309
2310 del_timer_sync(&mos7840_port->led_timer1);
2311 del_timer_sync(&mos7840_port->led_timer2);
2312
2313 usb_kill_urb(mos7840_port->led_urb);
2314 usb_free_urb(mos7840_port->led_urb);
2315 kfree(mos7840_port->led_dr);
2316 }
2317 usb_kill_urb(mos7840_port->control_urb);
2318 usb_free_urb(mos7840_port->control_urb);
2319 kfree(mos7840_port->ctrl_buf);
2320 kfree(mos7840_port->dr);
2321 kfree(mos7840_port);
2322
2323 return 0;
2324}
2325
2326static struct usb_serial_driver moschip7840_4port_device = {
2327 .driver = {
2328 .owner = THIS_MODULE,
2329 .name = "mos7840",
2330 },
2331 .description = DRIVER_DESC,
2332 .id_table = id_table,
2333 .num_interrupt_in = 1,
2334 .open = mos7840_open,
2335 .close = mos7840_close,
2336 .write = mos7840_write,
2337 .write_room = mos7840_write_room,
2338 .chars_in_buffer = mos7840_chars_in_buffer,
2339 .throttle = mos7840_throttle,
2340 .unthrottle = mos7840_unthrottle,
2341 .calc_num_ports = mos7840_calc_num_ports,
2342 .probe = mos7840_probe,
2343 .ioctl = mos7840_ioctl,
2344 .get_serial = mos7840_get_serial_info,
2345 .set_termios = mos7840_set_termios,
2346 .break_ctl = mos7840_break,
2347 .tiocmget = mos7840_tiocmget,
2348 .tiocmset = mos7840_tiocmset,
2349 .tiocmiwait = usb_serial_generic_tiocmiwait,
2350 .get_icount = usb_serial_generic_get_icount,
2351 .port_probe = mos7840_port_probe,
2352 .port_remove = mos7840_port_remove,
2353 .read_bulk_callback = mos7840_bulk_in_callback,
2354 .read_int_callback = mos7840_interrupt_callback,
2355};
2356
2357static struct usb_serial_driver * const serial_drivers[] = {
2358 &moschip7840_4port_device, NULL
2359};
2360
2361module_usb_serial_driver(serial_drivers, id_table);
2362
2363MODULE_DESCRIPTION(DRIVER_DESC);
2364MODULE_LICENSE("GPL");
1/*
2 * This program is free software; you can redistribute it and/or modify
3 * it under the terms of the GNU General Public License as published by
4 * the Free Software Foundation; either version 2 of the License, or
5 * (at your option) any later version.
6 *
7 * This program is distributed in the hope that it will be useful,
8 * but WITHOUT ANY WARRANTY; without even the implied warranty of
9 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
10 * GNU General Public License for more details.
11 *
12 * You should have received a copy of the GNU General Public License
13 * along with this program; if not, write to the Free Software
14 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
15 *
16 * Clean ups from Moschip version and a few ioctl implementations by:
17 * Paul B Schroeder <pschroeder "at" uplogix "dot" com>
18 *
19 * Originally based on drivers/usb/serial/io_edgeport.c which is:
20 * Copyright (C) 2000 Inside Out Networks, All rights reserved.
21 * Copyright (C) 2001-2002 Greg Kroah-Hartman <greg@kroah.com>
22 *
23 */
24
25#include <linux/kernel.h>
26#include <linux/errno.h>
27#include <linux/init.h>
28#include <linux/slab.h>
29#include <linux/tty.h>
30#include <linux/tty_driver.h>
31#include <linux/tty_flip.h>
32#include <linux/module.h>
33#include <linux/serial.h>
34#include <linux/usb.h>
35#include <linux/usb/serial.h>
36#include <linux/uaccess.h>
37
38/*
39 * Version Information
40 */
41#define DRIVER_VERSION "1.3.2"
42#define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
43
44/*
45 * 16C50 UART register defines
46 */
47
48#define LCR_BITS_5 0x00 /* 5 bits/char */
49#define LCR_BITS_6 0x01 /* 6 bits/char */
50#define LCR_BITS_7 0x02 /* 7 bits/char */
51#define LCR_BITS_8 0x03 /* 8 bits/char */
52#define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
53
54#define LCR_STOP_1 0x00 /* 1 stop bit */
55#define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */
56#define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */
57#define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
58
59#define LCR_PAR_NONE 0x00 /* No parity */
60#define LCR_PAR_ODD 0x08 /* Odd parity */
61#define LCR_PAR_EVEN 0x18 /* Even parity */
62#define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */
63#define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */
64#define LCR_PAR_MASK 0x38 /* Mask for parity field */
65
66#define LCR_SET_BREAK 0x40 /* Set Break condition */
67#define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */
68
69#define MCR_DTR 0x01 /* Assert DTR */
70#define MCR_RTS 0x02 /* Assert RTS */
71#define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */
72#define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */
73#define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */
74#define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */
75
76#define MOS7840_MSR_CTS 0x10 /* Current state of CTS */
77#define MOS7840_MSR_DSR 0x20 /* Current state of DSR */
78#define MOS7840_MSR_RI 0x40 /* Current state of RI */
79#define MOS7840_MSR_CD 0x80 /* Current state of CD */
80
81/*
82 * Defines used for sending commands to port
83 */
84
85#define WAIT_FOR_EVER (HZ * 0) /* timeout urb is wait for ever */
86#define MOS_WDR_TIMEOUT (HZ * 5) /* default urb timeout */
87
88#define MOS_PORT1 0x0200
89#define MOS_PORT2 0x0300
90#define MOS_VENREG 0x0000
91#define MOS_MAX_PORT 0x02
92#define MOS_WRITE 0x0E
93#define MOS_READ 0x0D
94
95/* Requests */
96#define MCS_RD_RTYPE 0xC0
97#define MCS_WR_RTYPE 0x40
98#define MCS_RDREQ 0x0D
99#define MCS_WRREQ 0x0E
100#define MCS_CTRL_TIMEOUT 500
101#define VENDOR_READ_LENGTH (0x01)
102
103#define MAX_NAME_LEN 64
104
105#define ZLP_REG1 0x3A /* Zero_Flag_Reg1 58 */
106#define ZLP_REG5 0x3E /* Zero_Flag_Reg5 62 */
107
108/* For higher baud Rates use TIOCEXBAUD */
109#define TIOCEXBAUD 0x5462
110
111/* vendor id and device id defines */
112
113/* The native mos7840/7820 component */
114#define USB_VENDOR_ID_MOSCHIP 0x9710
115#define MOSCHIP_DEVICE_ID_7840 0x7840
116#define MOSCHIP_DEVICE_ID_7820 0x7820
117#define MOSCHIP_DEVICE_ID_7810 0x7810
118/* The native component can have its vendor/device id's overridden
119 * in vendor-specific implementations. Such devices can be handled
120 * by making a change here, in id_table.
121 */
122#define USB_VENDOR_ID_BANDB 0x0856
123#define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
124#define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00
125#define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
126#define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01
127#define BANDB_DEVICE_ID_US9ML2_2 0xAC29
128#define BANDB_DEVICE_ID_US9ML2_4 0xAC30
129#define BANDB_DEVICE_ID_USPTL4_2 0xAC31
130#define BANDB_DEVICE_ID_USPTL4_4 0xAC32
131#define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
132#define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02
133#define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
134#define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
135#define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
136
137/* This driver also supports
138 * ATEN UC2324 device using Moschip MCS7840
139 * ATEN UC2322 device using Moschip MCS7820
140 */
141#define USB_VENDOR_ID_ATENINTL 0x0557
142#define ATENINTL_DEVICE_ID_UC2324 0x2011
143#define ATENINTL_DEVICE_ID_UC2322 0x7820
144
145/* Interrupt Routine Defines */
146
147#define SERIAL_IIR_RLS 0x06
148#define SERIAL_IIR_MS 0x00
149
150/*
151 * Emulation of the bit mask on the LINE STATUS REGISTER.
152 */
153#define SERIAL_LSR_DR 0x0001
154#define SERIAL_LSR_OE 0x0002
155#define SERIAL_LSR_PE 0x0004
156#define SERIAL_LSR_FE 0x0008
157#define SERIAL_LSR_BI 0x0010
158
159#define MOS_MSR_DELTA_CTS 0x10
160#define MOS_MSR_DELTA_DSR 0x20
161#define MOS_MSR_DELTA_RI 0x40
162#define MOS_MSR_DELTA_CD 0x80
163
164/* Serial Port register Address */
165#define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
166#define FIFO_CONTROL_REGISTER ((__u16)(0x02))
167#define LINE_CONTROL_REGISTER ((__u16)(0x03))
168#define MODEM_CONTROL_REGISTER ((__u16)(0x04))
169#define LINE_STATUS_REGISTER ((__u16)(0x05))
170#define MODEM_STATUS_REGISTER ((__u16)(0x06))
171#define SCRATCH_PAD_REGISTER ((__u16)(0x07))
172#define DIVISOR_LATCH_LSB ((__u16)(0x00))
173#define DIVISOR_LATCH_MSB ((__u16)(0x01))
174
175#define CLK_MULTI_REGISTER ((__u16)(0x02))
176#define CLK_START_VALUE_REGISTER ((__u16)(0x03))
177#define GPIO_REGISTER ((__u16)(0x07))
178
179#define SERIAL_LCR_DLAB ((__u16)(0x0080))
180
181/*
182 * URB POOL related defines
183 */
184#define NUM_URBS 16 /* URB Count */
185#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
186
187/* LED on/off milliseconds*/
188#define LED_ON_MS 500
189#define LED_OFF_MS 500
190
191static int device_type;
192
193static const struct usb_device_id id_table[] = {
194 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
195 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
196 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
197 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
198 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
199 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
200 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
201 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
202 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
203 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
204 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
205 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
206 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
207 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
208 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
209 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
210 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
211 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
212 {} /* terminating entry */
213};
214MODULE_DEVICE_TABLE(usb, id_table);
215
216/* This structure holds all of the local port information */
217
218struct moschip_port {
219 int port_num; /*Actual port number in the device(1,2,etc) */
220 struct urb *write_urb; /* write URB for this port */
221 struct urb *read_urb; /* read URB for this port */
222 struct urb *int_urb;
223 __u8 shadowLCR; /* last LCR value received */
224 __u8 shadowMCR; /* last MCR value received */
225 char open;
226 char open_ports;
227 char zombie;
228 wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
229 wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
230 int delta_msr_cond;
231 struct async_icount icount;
232 struct usb_serial_port *port; /* loop back to the owner of this object */
233
234 /* Offsets */
235 __u8 SpRegOffset;
236 __u8 ControlRegOffset;
237 __u8 DcrRegOffset;
238 /* for processing control URBS in interrupt context */
239 struct urb *control_urb;
240 struct usb_ctrlrequest *dr;
241 char *ctrl_buf;
242 int MsrLsr;
243
244 spinlock_t pool_lock;
245 struct urb *write_urb_pool[NUM_URBS];
246 char busy[NUM_URBS];
247 bool read_urb_busy;
248
249 /* For device(s) with LED indicator */
250 bool has_led;
251 bool led_flag;
252 struct timer_list led_timer1; /* Timer for LED on */
253 struct timer_list led_timer2; /* Timer for LED off */
254};
255
256static bool debug;
257
258/*
259 * mos7840_set_reg_sync
260 * To set the Control register by calling usb_fill_control_urb function
261 * by passing usb_sndctrlpipe function as parameter.
262 */
263
264static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
265 __u16 val)
266{
267 struct usb_device *dev = port->serial->dev;
268 val = val & 0x00ff;
269 dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
270
271 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
272 MCS_WR_RTYPE, val, reg, NULL, 0,
273 MOS_WDR_TIMEOUT);
274}
275
276/*
277 * mos7840_get_reg_sync
278 * To set the Uart register by calling usb_fill_control_urb function by
279 * passing usb_rcvctrlpipe function as parameter.
280 */
281
282static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
283 __u16 *val)
284{
285 struct usb_device *dev = port->serial->dev;
286 int ret = 0;
287 u8 *buf;
288
289 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
290 if (!buf)
291 return -ENOMEM;
292
293 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
294 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
295 MOS_WDR_TIMEOUT);
296 *val = buf[0];
297 dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
298
299 kfree(buf);
300 return ret;
301}
302
303/*
304 * mos7840_set_uart_reg
305 * To set the Uart register by calling usb_fill_control_urb function by
306 * passing usb_sndctrlpipe function as parameter.
307 */
308
309static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
310 __u16 val)
311{
312
313 struct usb_device *dev = port->serial->dev;
314 val = val & 0x00ff;
315 /* For the UART control registers, the application number need
316 to be Or'ed */
317 if (port->serial->num_ports == 4) {
318 val |= (((__u16) port->number -
319 (__u16) (port->serial->minor)) + 1) << 8;
320 dbg("mos7840_set_uart_reg application number is %x", val);
321 } else {
322 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
323 val |= (((__u16) port->number -
324 (__u16) (port->serial->minor)) + 1) << 8;
325 dbg("mos7840_set_uart_reg application number is %x",
326 val);
327 } else {
328 val |=
329 (((__u16) port->number -
330 (__u16) (port->serial->minor)) + 2) << 8;
331 dbg("mos7840_set_uart_reg application number is %x",
332 val);
333 }
334 }
335 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
336 MCS_WR_RTYPE, val, reg, NULL, 0,
337 MOS_WDR_TIMEOUT);
338
339}
340
341/*
342 * mos7840_get_uart_reg
343 * To set the Control register by calling usb_fill_control_urb function
344 * by passing usb_rcvctrlpipe function as parameter.
345 */
346static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
347 __u16 *val)
348{
349 struct usb_device *dev = port->serial->dev;
350 int ret = 0;
351 __u16 Wval;
352 u8 *buf;
353
354 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
355 if (!buf)
356 return -ENOMEM;
357
358 /* dbg("application number is %4x",
359 (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
360 /* Wval is same as application number */
361 if (port->serial->num_ports == 4) {
362 Wval =
363 (((__u16) port->number - (__u16) (port->serial->minor)) +
364 1) << 8;
365 dbg("mos7840_get_uart_reg application number is %x", Wval);
366 } else {
367 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
368 Wval = (((__u16) port->number -
369 (__u16) (port->serial->minor)) + 1) << 8;
370 dbg("mos7840_get_uart_reg application number is %x",
371 Wval);
372 } else {
373 Wval = (((__u16) port->number -
374 (__u16) (port->serial->minor)) + 2) << 8;
375 dbg("mos7840_get_uart_reg application number is %x",
376 Wval);
377 }
378 }
379 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
380 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
381 MOS_WDR_TIMEOUT);
382 *val = buf[0];
383
384 kfree(buf);
385 return ret;
386}
387
388static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
389{
390
391 dbg("***************************************");
392 dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
393 dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
394 dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
395 dbg("***************************************");
396
397}
398
399/************************************************************************/
400/************************************************************************/
401/* I N T E R F A C E F U N C T I O N S */
402/* I N T E R F A C E F U N C T I O N S */
403/************************************************************************/
404/************************************************************************/
405
406static inline void mos7840_set_port_private(struct usb_serial_port *port,
407 struct moschip_port *data)
408{
409 usb_set_serial_port_data(port, (void *)data);
410}
411
412static inline struct moschip_port *mos7840_get_port_private(struct
413 usb_serial_port
414 *port)
415{
416 return (struct moschip_port *)usb_get_serial_port_data(port);
417}
418
419static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
420{
421 struct moschip_port *mos7840_port;
422 struct async_icount *icount;
423 mos7840_port = port;
424 icount = &mos7840_port->icount;
425 if (new_msr &
426 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
427 MOS_MSR_DELTA_CD)) {
428 icount = &mos7840_port->icount;
429
430 /* update input line counters */
431 if (new_msr & MOS_MSR_DELTA_CTS) {
432 icount->cts++;
433 smp_wmb();
434 }
435 if (new_msr & MOS_MSR_DELTA_DSR) {
436 icount->dsr++;
437 smp_wmb();
438 }
439 if (new_msr & MOS_MSR_DELTA_CD) {
440 icount->dcd++;
441 smp_wmb();
442 }
443 if (new_msr & MOS_MSR_DELTA_RI) {
444 icount->rng++;
445 smp_wmb();
446 }
447 }
448}
449
450static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
451{
452 struct async_icount *icount;
453
454 dbg("%s - %02x", __func__, new_lsr);
455
456 if (new_lsr & SERIAL_LSR_BI) {
457 /*
458 * Parity and Framing errors only count if they
459 * occur exclusive of a break being
460 * received.
461 */
462 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
463 }
464
465 /* update input line counters */
466 icount = &port->icount;
467 if (new_lsr & SERIAL_LSR_BI) {
468 icount->brk++;
469 smp_wmb();
470 }
471 if (new_lsr & SERIAL_LSR_OE) {
472 icount->overrun++;
473 smp_wmb();
474 }
475 if (new_lsr & SERIAL_LSR_PE) {
476 icount->parity++;
477 smp_wmb();
478 }
479 if (new_lsr & SERIAL_LSR_FE) {
480 icount->frame++;
481 smp_wmb();
482 }
483}
484
485/************************************************************************/
486/************************************************************************/
487/* U S B C A L L B A C K F U N C T I O N S */
488/* U S B C A L L B A C K F U N C T I O N S */
489/************************************************************************/
490/************************************************************************/
491
492static void mos7840_control_callback(struct urb *urb)
493{
494 unsigned char *data;
495 struct moschip_port *mos7840_port;
496 __u8 regval = 0x0;
497 int result = 0;
498 int status = urb->status;
499
500 mos7840_port = urb->context;
501
502 switch (status) {
503 case 0:
504 /* success */
505 break;
506 case -ECONNRESET:
507 case -ENOENT:
508 case -ESHUTDOWN:
509 /* this urb is terminated, clean up */
510 dbg("%s - urb shutting down with status: %d", __func__,
511 status);
512 return;
513 default:
514 dbg("%s - nonzero urb status received: %d", __func__,
515 status);
516 goto exit;
517 }
518
519 dbg("%s urb buffer size is %d", __func__, urb->actual_length);
520 dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
521 mos7840_port->MsrLsr, mos7840_port->port_num);
522 data = urb->transfer_buffer;
523 regval = (__u8) data[0];
524 dbg("%s data is %x", __func__, regval);
525 if (mos7840_port->MsrLsr == 0)
526 mos7840_handle_new_msr(mos7840_port, regval);
527 else if (mos7840_port->MsrLsr == 1)
528 mos7840_handle_new_lsr(mos7840_port, regval);
529
530exit:
531 spin_lock(&mos7840_port->pool_lock);
532 if (!mos7840_port->zombie)
533 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
534 spin_unlock(&mos7840_port->pool_lock);
535 if (result) {
536 dev_err(&urb->dev->dev,
537 "%s - Error %d submitting interrupt urb\n",
538 __func__, result);
539 }
540}
541
542static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
543 __u16 *val)
544{
545 struct usb_device *dev = mcs->port->serial->dev;
546 struct usb_ctrlrequest *dr = mcs->dr;
547 unsigned char *buffer = mcs->ctrl_buf;
548 int ret;
549
550 dr->bRequestType = MCS_RD_RTYPE;
551 dr->bRequest = MCS_RDREQ;
552 dr->wValue = cpu_to_le16(Wval); /* 0 */
553 dr->wIndex = cpu_to_le16(reg);
554 dr->wLength = cpu_to_le16(2);
555
556 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
557 (unsigned char *)dr, buffer, 2,
558 mos7840_control_callback, mcs);
559 mcs->control_urb->transfer_buffer_length = 2;
560 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
561 return ret;
562}
563
564static void mos7840_set_led_callback(struct urb *urb)
565{
566 switch (urb->status) {
567 case 0:
568 /* Success */
569 break;
570 case -ECONNRESET:
571 case -ENOENT:
572 case -ESHUTDOWN:
573 /* This urb is terminated, clean up */
574 dbg("%s - urb shutting down with status: %d", __func__,
575 urb->status);
576 break;
577 default:
578 dbg("%s - nonzero urb status received: %d", __func__,
579 urb->status);
580 }
581}
582
583static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
584 __u16 reg)
585{
586 struct usb_device *dev = mcs->port->serial->dev;
587 struct usb_ctrlrequest *dr = mcs->dr;
588
589 dr->bRequestType = MCS_WR_RTYPE;
590 dr->bRequest = MCS_WRREQ;
591 dr->wValue = cpu_to_le16(wval);
592 dr->wIndex = cpu_to_le16(reg);
593 dr->wLength = cpu_to_le16(0);
594
595 usb_fill_control_urb(mcs->control_urb, dev, usb_sndctrlpipe(dev, 0),
596 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
597
598 usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
599}
600
601static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
602 __u16 val)
603{
604 struct usb_device *dev = port->serial->dev;
605
606 usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
607 val, reg, NULL, 0, MOS_WDR_TIMEOUT);
608}
609
610static void mos7840_led_off(unsigned long arg)
611{
612 struct moschip_port *mcs = (struct moschip_port *) arg;
613
614 /* Turn off LED */
615 mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
616 mod_timer(&mcs->led_timer2,
617 jiffies + msecs_to_jiffies(LED_OFF_MS));
618}
619
620static void mos7840_led_flag_off(unsigned long arg)
621{
622 struct moschip_port *mcs = (struct moschip_port *) arg;
623
624 mcs->led_flag = false;
625}
626
627/*****************************************************************************
628 * mos7840_interrupt_callback
629 * this is the callback function for when we have received data on the
630 * interrupt endpoint.
631 *****************************************************************************/
632
633static void mos7840_interrupt_callback(struct urb *urb)
634{
635 int result;
636 int length;
637 struct moschip_port *mos7840_port;
638 struct usb_serial *serial;
639 __u16 Data;
640 unsigned char *data;
641 __u8 sp[5], st;
642 int i, rv = 0;
643 __u16 wval, wreg = 0;
644 int status = urb->status;
645
646 switch (status) {
647 case 0:
648 /* success */
649 break;
650 case -ECONNRESET:
651 case -ENOENT:
652 case -ESHUTDOWN:
653 /* this urb is terminated, clean up */
654 dbg("%s - urb shutting down with status: %d", __func__,
655 status);
656 return;
657 default:
658 dbg("%s - nonzero urb status received: %d", __func__,
659 status);
660 goto exit;
661 }
662
663 length = urb->actual_length;
664 data = urb->transfer_buffer;
665
666 serial = urb->context;
667
668 /* Moschip get 5 bytes
669 * Byte 1 IIR Port 1 (port.number is 0)
670 * Byte 2 IIR Port 2 (port.number is 1)
671 * Byte 3 IIR Port 3 (port.number is 2)
672 * Byte 4 IIR Port 4 (port.number is 3)
673 * Byte 5 FIFO status for both */
674
675 if (length && length > 5) {
676 dbg("%s", "Wrong data !!!");
677 return;
678 }
679
680 sp[0] = (__u8) data[0];
681 sp[1] = (__u8) data[1];
682 sp[2] = (__u8) data[2];
683 sp[3] = (__u8) data[3];
684 st = (__u8) data[4];
685
686 for (i = 0; i < serial->num_ports; i++) {
687 mos7840_port = mos7840_get_port_private(serial->port[i]);
688 wval =
689 (((__u16) serial->port[i]->number -
690 (__u16) (serial->minor)) + 1) << 8;
691 if (mos7840_port->open) {
692 if (sp[i] & 0x01) {
693 dbg("SP%d No Interrupt !!!", i);
694 } else {
695 switch (sp[i] & 0x0f) {
696 case SERIAL_IIR_RLS:
697 dbg("Serial Port %d: Receiver status error or ", i);
698 dbg("address bit detected in 9-bit mode");
699 mos7840_port->MsrLsr = 1;
700 wreg = LINE_STATUS_REGISTER;
701 break;
702 case SERIAL_IIR_MS:
703 dbg("Serial Port %d: Modem status change", i);
704 mos7840_port->MsrLsr = 0;
705 wreg = MODEM_STATUS_REGISTER;
706 break;
707 }
708 spin_lock(&mos7840_port->pool_lock);
709 if (!mos7840_port->zombie) {
710 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
711 } else {
712 spin_unlock(&mos7840_port->pool_lock);
713 return;
714 }
715 spin_unlock(&mos7840_port->pool_lock);
716 }
717 }
718 }
719 if (!(rv < 0))
720 /* the completion handler for the control urb will resubmit */
721 return;
722exit:
723 result = usb_submit_urb(urb, GFP_ATOMIC);
724 if (result) {
725 dev_err(&urb->dev->dev,
726 "%s - Error %d submitting interrupt urb\n",
727 __func__, result);
728 }
729}
730
731static int mos7840_port_paranoia_check(struct usb_serial_port *port,
732 const char *function)
733{
734 if (!port) {
735 dbg("%s - port == NULL", function);
736 return -1;
737 }
738 if (!port->serial) {
739 dbg("%s - port->serial == NULL", function);
740 return -1;
741 }
742
743 return 0;
744}
745
746/* Inline functions to check the sanity of a pointer that is passed to us */
747static int mos7840_serial_paranoia_check(struct usb_serial *serial,
748 const char *function)
749{
750 if (!serial) {
751 dbg("%s - serial == NULL", function);
752 return -1;
753 }
754 if (!serial->type) {
755 dbg("%s - serial->type == NULL!", function);
756 return -1;
757 }
758
759 return 0;
760}
761
762static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
763 const char *function)
764{
765 /* if no port was specified, or it fails a paranoia check */
766 if (!port ||
767 mos7840_port_paranoia_check(port, function) ||
768 mos7840_serial_paranoia_check(port->serial, function)) {
769 /* then say that we don't have a valid usb_serial thing,
770 * which will end up genrating -ENODEV return values */
771 return NULL;
772 }
773
774 return port->serial;
775}
776
777/*****************************************************************************
778 * mos7840_bulk_in_callback
779 * this is the callback function for when we have received data on the
780 * bulk in endpoint.
781 *****************************************************************************/
782
783static void mos7840_bulk_in_callback(struct urb *urb)
784{
785 int retval;
786 unsigned char *data;
787 struct usb_serial *serial;
788 struct usb_serial_port *port;
789 struct moschip_port *mos7840_port;
790 struct tty_struct *tty;
791 int status = urb->status;
792
793 mos7840_port = urb->context;
794 if (!mos7840_port) {
795 dbg("%s", "NULL mos7840_port pointer");
796 return;
797 }
798
799 if (status) {
800 dbg("nonzero read bulk status received: %d", status);
801 mos7840_port->read_urb_busy = false;
802 return;
803 }
804
805 port = (struct usb_serial_port *)mos7840_port->port;
806 if (mos7840_port_paranoia_check(port, __func__)) {
807 dbg("%s", "Port Paranoia failed");
808 mos7840_port->read_urb_busy = false;
809 return;
810 }
811
812 serial = mos7840_get_usb_serial(port, __func__);
813 if (!serial) {
814 dbg("%s", "Bad serial pointer");
815 mos7840_port->read_urb_busy = false;
816 return;
817 }
818
819 data = urb->transfer_buffer;
820
821 if (urb->actual_length) {
822 tty = tty_port_tty_get(&mos7840_port->port->port);
823 if (tty) {
824 tty_insert_flip_string(tty, data, urb->actual_length);
825 dbg(" %s ", data);
826 tty_flip_buffer_push(tty);
827 tty_kref_put(tty);
828 }
829 mos7840_port->icount.rx += urb->actual_length;
830 smp_wmb();
831 dbg("mos7840_port->icount.rx is %d:",
832 mos7840_port->icount.rx);
833 }
834
835 if (!mos7840_port->read_urb) {
836 dbg("%s", "URB KILLED !!!");
837 mos7840_port->read_urb_busy = false;
838 return;
839 }
840
841 /* Turn on LED */
842 if (mos7840_port->has_led && !mos7840_port->led_flag) {
843 mos7840_port->led_flag = true;
844 mos7840_set_led_async(mos7840_port, 0x0301,
845 MODEM_CONTROL_REGISTER);
846 mod_timer(&mos7840_port->led_timer1,
847 jiffies + msecs_to_jiffies(LED_ON_MS));
848 }
849
850 mos7840_port->read_urb_busy = true;
851 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
852
853 if (retval) {
854 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
855 mos7840_port->read_urb_busy = false;
856 }
857}
858
859/*****************************************************************************
860 * mos7840_bulk_out_data_callback
861 * this is the callback function for when we have finished sending
862 * serial data on the bulk out endpoint.
863 *****************************************************************************/
864
865static void mos7840_bulk_out_data_callback(struct urb *urb)
866{
867 struct moschip_port *mos7840_port;
868 struct tty_struct *tty;
869 int status = urb->status;
870 int i;
871
872 mos7840_port = urb->context;
873 spin_lock(&mos7840_port->pool_lock);
874 for (i = 0; i < NUM_URBS; i++) {
875 if (urb == mos7840_port->write_urb_pool[i]) {
876 mos7840_port->busy[i] = 0;
877 break;
878 }
879 }
880 spin_unlock(&mos7840_port->pool_lock);
881
882 if (status) {
883 dbg("nonzero write bulk status received:%d", status);
884 return;
885 }
886
887 if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
888 dbg("%s", "Port Paranoia failed");
889 return;
890 }
891
892 tty = tty_port_tty_get(&mos7840_port->port->port);
893 if (tty && mos7840_port->open)
894 tty_wakeup(tty);
895 tty_kref_put(tty);
896
897}
898
899/************************************************************************/
900/* D R I V E R T T Y I N T E R F A C E F U N C T I O N S */
901/************************************************************************/
902#ifdef MCSSerialProbe
903static int mos7840_serial_probe(struct usb_serial *serial,
904 const struct usb_device_id *id)
905{
906
907 /*need to implement the mode_reg reading and updating\
908 structures usb_serial_ device_type\
909 (i.e num_ports, num_bulkin,bulkout etc) */
910 /* Also we can update the changes attach */
911 return 1;
912}
913#endif
914
915/*****************************************************************************
916 * mos7840_open
917 * this function is called by the tty driver when a port is opened
918 * If successful, we return 0
919 * Otherwise we return a negative error number.
920 *****************************************************************************/
921
922static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
923{
924 int response;
925 int j;
926 struct usb_serial *serial;
927 struct urb *urb;
928 __u16 Data;
929 int status;
930 struct moschip_port *mos7840_port;
931 struct moschip_port *port0;
932
933 if (mos7840_port_paranoia_check(port, __func__)) {
934 dbg("%s", "Port Paranoia failed");
935 return -ENODEV;
936 }
937
938 serial = port->serial;
939
940 if (mos7840_serial_paranoia_check(serial, __func__)) {
941 dbg("%s", "Serial Paranoia failed");
942 return -ENODEV;
943 }
944
945 mos7840_port = mos7840_get_port_private(port);
946 port0 = mos7840_get_port_private(serial->port[0]);
947
948 if (mos7840_port == NULL || port0 == NULL)
949 return -ENODEV;
950
951 usb_clear_halt(serial->dev, port->write_urb->pipe);
952 usb_clear_halt(serial->dev, port->read_urb->pipe);
953 port0->open_ports++;
954
955 /* Initialising the write urb pool */
956 for (j = 0; j < NUM_URBS; ++j) {
957 urb = usb_alloc_urb(0, GFP_KERNEL);
958 mos7840_port->write_urb_pool[j] = urb;
959
960 if (urb == NULL) {
961 dev_err(&port->dev, "No more urbs???\n");
962 continue;
963 }
964
965 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
966 GFP_KERNEL);
967 if (!urb->transfer_buffer) {
968 usb_free_urb(urb);
969 mos7840_port->write_urb_pool[j] = NULL;
970 dev_err(&port->dev,
971 "%s-out of memory for urb buffers.\n",
972 __func__);
973 continue;
974 }
975 }
976
977/*****************************************************************************
978 * Initialize MCS7840 -- Write Init values to corresponding Registers
979 *
980 * Register Index
981 * 1 : IER
982 * 2 : FCR
983 * 3 : LCR
984 * 4 : MCR
985 *
986 * 0x08 : SP1/2 Control Reg
987 *****************************************************************************/
988
989 /* NEED to check the following Block */
990
991 Data = 0x0;
992 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
993 if (status < 0) {
994 dbg("Reading Spreg failed");
995 return -1;
996 }
997 Data |= 0x80;
998 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
999 if (status < 0) {
1000 dbg("writing Spreg failed");
1001 return -1;
1002 }
1003
1004 Data &= ~0x80;
1005 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1006 if (status < 0) {
1007 dbg("writing Spreg failed");
1008 return -1;
1009 }
1010 /* End of block to be checked */
1011
1012 Data = 0x0;
1013 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1014 &Data);
1015 if (status < 0) {
1016 dbg("Reading Controlreg failed");
1017 return -1;
1018 }
1019 Data |= 0x08; /* Driver done bit */
1020 Data |= 0x20; /* rx_disable */
1021 status = mos7840_set_reg_sync(port,
1022 mos7840_port->ControlRegOffset, Data);
1023 if (status < 0) {
1024 dbg("writing Controlreg failed");
1025 return -1;
1026 }
1027 /* do register settings here */
1028 /* Set all regs to the device default values. */
1029 /***********************************
1030 * First Disable all interrupts.
1031 ***********************************/
1032 Data = 0x00;
1033 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1034 if (status < 0) {
1035 dbg("disabling interrupts failed");
1036 return -1;
1037 }
1038 /* Set FIFO_CONTROL_REGISTER to the default value */
1039 Data = 0x00;
1040 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1041 if (status < 0) {
1042 dbg("Writing FIFO_CONTROL_REGISTER failed");
1043 return -1;
1044 }
1045
1046 Data = 0xcf;
1047 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1048 if (status < 0) {
1049 dbg("Writing FIFO_CONTROL_REGISTER failed");
1050 return -1;
1051 }
1052
1053 Data = 0x03;
1054 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1055 mos7840_port->shadowLCR = Data;
1056
1057 Data = 0x0b;
1058 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1059 mos7840_port->shadowMCR = Data;
1060
1061 Data = 0x00;
1062 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1063 mos7840_port->shadowLCR = Data;
1064
1065 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1066 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1067
1068 Data = 0x0c;
1069 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1070
1071 Data = 0x0;
1072 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1073
1074 Data = 0x00;
1075 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1076
1077 Data = Data & ~SERIAL_LCR_DLAB;
1078 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1079 mos7840_port->shadowLCR = Data;
1080
1081 /* clearing Bulkin and Bulkout Fifo */
1082 Data = 0x0;
1083 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1084
1085 Data = Data | 0x0c;
1086 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1087
1088 Data = Data & ~0x0c;
1089 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1090 /* Finally enable all interrupts */
1091 Data = 0x0c;
1092 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1093
1094 /* clearing rx_disable */
1095 Data = 0x0;
1096 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1097 &Data);
1098 Data = Data & ~0x20;
1099 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1100 Data);
1101
1102 /* rx_negate */
1103 Data = 0x0;
1104 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1105 &Data);
1106 Data = Data | 0x10;
1107 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1108 Data);
1109
1110 /* Check to see if we've set up our endpoint info yet *
1111 * (can't set it up in mos7840_startup as the structures *
1112 * were not set up at that time.) */
1113 if (port0->open_ports == 1) {
1114 if (serial->port[0]->interrupt_in_buffer == NULL) {
1115 /* set up interrupt urb */
1116 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1117 serial->dev,
1118 usb_rcvintpipe(serial->dev,
1119 serial->port[0]->interrupt_in_endpointAddress),
1120 serial->port[0]->interrupt_in_buffer,
1121 serial->port[0]->interrupt_in_urb->
1122 transfer_buffer_length,
1123 mos7840_interrupt_callback,
1124 serial,
1125 serial->port[0]->interrupt_in_urb->interval);
1126
1127 /* start interrupt read for mos7840 *
1128 * will continue as long as mos7840 is connected */
1129
1130 response =
1131 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1132 GFP_KERNEL);
1133 if (response) {
1134 dev_err(&port->dev, "%s - Error %d submitting "
1135 "interrupt urb\n", __func__, response);
1136 }
1137
1138 }
1139
1140 }
1141
1142 /* see if we've set up our endpoint info yet *
1143 * (can't set it up in mos7840_startup as the *
1144 * structures were not set up at that time.) */
1145
1146 dbg("port number is %d", port->number);
1147 dbg("serial number is %d", port->serial->minor);
1148 dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1149 dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1150 dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1151 dbg("port's number in the device is %d", mos7840_port->port_num);
1152 mos7840_port->read_urb = port->read_urb;
1153
1154 /* set up our bulk in urb */
1155 if ((serial->num_ports == 2)
1156 && ((((__u16)port->number -
1157 (__u16)(port->serial->minor)) % 2) != 0)) {
1158 usb_fill_bulk_urb(mos7840_port->read_urb,
1159 serial->dev,
1160 usb_rcvbulkpipe(serial->dev,
1161 (port->bulk_in_endpointAddress) + 2),
1162 port->bulk_in_buffer,
1163 mos7840_port->read_urb->transfer_buffer_length,
1164 mos7840_bulk_in_callback, mos7840_port);
1165 } else {
1166 usb_fill_bulk_urb(mos7840_port->read_urb,
1167 serial->dev,
1168 usb_rcvbulkpipe(serial->dev,
1169 port->bulk_in_endpointAddress),
1170 port->bulk_in_buffer,
1171 mos7840_port->read_urb->transfer_buffer_length,
1172 mos7840_bulk_in_callback, mos7840_port);
1173 }
1174
1175 dbg("mos7840_open: bulkin endpoint is %d",
1176 port->bulk_in_endpointAddress);
1177 mos7840_port->read_urb_busy = true;
1178 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1179 if (response) {
1180 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1181 __func__, response);
1182 mos7840_port->read_urb_busy = false;
1183 }
1184
1185 /* initialize our wait queues */
1186 init_waitqueue_head(&mos7840_port->wait_chase);
1187 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1188
1189 /* initialize our icount structure */
1190 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1191
1192 /* initialize our port settings */
1193 /* Must set to enable ints! */
1194 mos7840_port->shadowMCR = MCR_MASTER_IE;
1195 /* send a open port command */
1196 mos7840_port->open = 1;
1197 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1198 mos7840_port->icount.tx = 0;
1199 mos7840_port->icount.rx = 0;
1200
1201 dbg("usb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p",
1202 serial, mos7840_port, port);
1203
1204 return 0;
1205}
1206
1207/*****************************************************************************
1208 * mos7840_chars_in_buffer
1209 * this function is called by the tty driver when it wants to know how many
1210 * bytes of data we currently have outstanding in the port (data that has
1211 * been written, but hasn't made it out the port yet)
1212 * If successful, we return the number of bytes left to be written in the
1213 * system,
1214 * Otherwise we return zero.
1215 *****************************************************************************/
1216
1217static int mos7840_chars_in_buffer(struct tty_struct *tty)
1218{
1219 struct usb_serial_port *port = tty->driver_data;
1220 int i;
1221 int chars = 0;
1222 unsigned long flags;
1223 struct moschip_port *mos7840_port;
1224
1225 if (mos7840_port_paranoia_check(port, __func__)) {
1226 dbg("%s", "Invalid port");
1227 return 0;
1228 }
1229
1230 mos7840_port = mos7840_get_port_private(port);
1231 if (mos7840_port == NULL)
1232 return 0;
1233
1234 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1235 for (i = 0; i < NUM_URBS; ++i) {
1236 if (mos7840_port->busy[i]) {
1237 struct urb *urb = mos7840_port->write_urb_pool[i];
1238 chars += urb->transfer_buffer_length;
1239 }
1240 }
1241 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1242 dbg("%s - returns %d", __func__, chars);
1243 return chars;
1244
1245}
1246
1247/*****************************************************************************
1248 * mos7840_close
1249 * this function is called by the tty driver when a port is closed
1250 *****************************************************************************/
1251
1252static void mos7840_close(struct usb_serial_port *port)
1253{
1254 struct usb_serial *serial;
1255 struct moschip_port *mos7840_port;
1256 struct moschip_port *port0;
1257 int j;
1258 __u16 Data;
1259
1260 if (mos7840_port_paranoia_check(port, __func__)) {
1261 dbg("%s", "Port Paranoia failed");
1262 return;
1263 }
1264
1265 serial = mos7840_get_usb_serial(port, __func__);
1266 if (!serial) {
1267 dbg("%s", "Serial Paranoia failed");
1268 return;
1269 }
1270
1271 mos7840_port = mos7840_get_port_private(port);
1272 port0 = mos7840_get_port_private(serial->port[0]);
1273
1274 if (mos7840_port == NULL || port0 == NULL)
1275 return;
1276
1277 for (j = 0; j < NUM_URBS; ++j)
1278 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1279
1280 /* Freeing Write URBs */
1281 for (j = 0; j < NUM_URBS; ++j) {
1282 if (mos7840_port->write_urb_pool[j]) {
1283 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1284 kfree(mos7840_port->write_urb_pool[j]->
1285 transfer_buffer);
1286
1287 usb_free_urb(mos7840_port->write_urb_pool[j]);
1288 }
1289 }
1290
1291 /* While closing port, shutdown all bulk read, write *
1292 * and interrupt read if they exists */
1293 if (serial->dev) {
1294 if (mos7840_port->write_urb) {
1295 dbg("%s", "Shutdown bulk write");
1296 usb_kill_urb(mos7840_port->write_urb);
1297 }
1298 if (mos7840_port->read_urb) {
1299 dbg("%s", "Shutdown bulk read");
1300 usb_kill_urb(mos7840_port->read_urb);
1301 mos7840_port->read_urb_busy = false;
1302 }
1303 if ((&mos7840_port->control_urb)) {
1304 dbg("%s", "Shutdown control read");
1305 /*/ usb_kill_urb (mos7840_port->control_urb); */
1306 }
1307 }
1308/* if(mos7840_port->ctrl_buf != NULL) */
1309/* kfree(mos7840_port->ctrl_buf); */
1310 port0->open_ports--;
1311 dbg("mos7840_num_open_ports in close%d:in port%d",
1312 port0->open_ports, port->number);
1313 if (port0->open_ports == 0) {
1314 if (serial->port[0]->interrupt_in_urb) {
1315 dbg("%s", "Shutdown interrupt_in_urb");
1316 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1317 }
1318 }
1319
1320 if (mos7840_port->write_urb) {
1321 /* if this urb had a transfer buffer already (old tx) free it */
1322 if (mos7840_port->write_urb->transfer_buffer != NULL)
1323 kfree(mos7840_port->write_urb->transfer_buffer);
1324 usb_free_urb(mos7840_port->write_urb);
1325 }
1326
1327 Data = 0x0;
1328 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1329
1330 Data = 0x00;
1331 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1332
1333 mos7840_port->open = 0;
1334}
1335
1336/************************************************************************
1337 *
1338 * mos7840_block_until_chase_response
1339 *
1340 * This function will block the close until one of the following:
1341 * 1. Response to our Chase comes from mos7840
1342 * 2. A timeout of 10 seconds without activity has expired
1343 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1344 *
1345 ************************************************************************/
1346
1347static void mos7840_block_until_chase_response(struct tty_struct *tty,
1348 struct moschip_port *mos7840_port)
1349{
1350 int timeout = 1 * HZ;
1351 int wait = 10;
1352 int count;
1353
1354 while (1) {
1355 count = mos7840_chars_in_buffer(tty);
1356
1357 /* Check for Buffer status */
1358 if (count <= 0)
1359 return;
1360
1361 /* Block the thread for a while */
1362 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1363 timeout);
1364 /* No activity.. count down section */
1365 wait--;
1366 if (wait == 0) {
1367 dbg("%s - TIMEOUT", __func__);
1368 return;
1369 } else {
1370 /* Reset timeout value back to seconds */
1371 wait = 10;
1372 }
1373 }
1374
1375}
1376
1377/*****************************************************************************
1378 * mos7840_break
1379 * this function sends a break to the port
1380 *****************************************************************************/
1381static void mos7840_break(struct tty_struct *tty, int break_state)
1382{
1383 struct usb_serial_port *port = tty->driver_data;
1384 unsigned char data;
1385 struct usb_serial *serial;
1386 struct moschip_port *mos7840_port;
1387
1388 if (mos7840_port_paranoia_check(port, __func__)) {
1389 dbg("%s", "Port Paranoia failed");
1390 return;
1391 }
1392
1393 serial = mos7840_get_usb_serial(port, __func__);
1394 if (!serial) {
1395 dbg("%s", "Serial Paranoia failed");
1396 return;
1397 }
1398
1399 mos7840_port = mos7840_get_port_private(port);
1400
1401 if (mos7840_port == NULL)
1402 return;
1403
1404 if (serial->dev)
1405 /* flush and block until tx is empty */
1406 mos7840_block_until_chase_response(tty, mos7840_port);
1407
1408 if (break_state == -1)
1409 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1410 else
1411 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1412
1413 /* FIXME: no locking on shadowLCR anywhere in driver */
1414 mos7840_port->shadowLCR = data;
1415 dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1416 mos7840_port->shadowLCR);
1417 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1418 mos7840_port->shadowLCR);
1419}
1420
1421/*****************************************************************************
1422 * mos7840_write_room
1423 * this function is called by the tty driver when it wants to know how many
1424 * bytes of data we can accept for a specific port.
1425 * If successful, we return the amount of room that we have for this port
1426 * Otherwise we return a negative error number.
1427 *****************************************************************************/
1428
1429static int mos7840_write_room(struct tty_struct *tty)
1430{
1431 struct usb_serial_port *port = tty->driver_data;
1432 int i;
1433 int room = 0;
1434 unsigned long flags;
1435 struct moschip_port *mos7840_port;
1436
1437 if (mos7840_port_paranoia_check(port, __func__)) {
1438 dbg("%s", "Invalid port");
1439 dbg("%s", " mos7840_write_room:leaving ...........");
1440 return -1;
1441 }
1442
1443 mos7840_port = mos7840_get_port_private(port);
1444 if (mos7840_port == NULL) {
1445 dbg("%s", "mos7840_break:leaving ...........");
1446 return -1;
1447 }
1448
1449 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1450 for (i = 0; i < NUM_URBS; ++i) {
1451 if (!mos7840_port->busy[i])
1452 room += URB_TRANSFER_BUFFER_SIZE;
1453 }
1454 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1455
1456 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1457 dbg("%s - returns %d", __func__, room);
1458 return room;
1459
1460}
1461
1462/*****************************************************************************
1463 * mos7840_write
1464 * this function is called by the tty driver when data should be written to
1465 * the port.
1466 * If successful, we return the number of bytes written, otherwise we
1467 * return a negative error number.
1468 *****************************************************************************/
1469
1470static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1471 const unsigned char *data, int count)
1472{
1473 int status;
1474 int i;
1475 int bytes_sent = 0;
1476 int transfer_size;
1477 unsigned long flags;
1478
1479 struct moschip_port *mos7840_port;
1480 struct usb_serial *serial;
1481 struct urb *urb;
1482 /* __u16 Data; */
1483 const unsigned char *current_position = data;
1484 unsigned char *data1;
1485
1486#ifdef NOTMOS7840
1487 Data = 0x00;
1488 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1489 mos7840_port->shadowLCR = Data;
1490 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1491 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1492 mos7840_port->shadowLCR);
1493
1494 /* Data = 0x03; */
1495 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1496 /* mos7840_port->shadowLCR=Data;//Need to add later */
1497
1498 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1499 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1500
1501 /* Data = 0x0c; */
1502 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1503 Data = 0x00;
1504 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1505 dbg("mos7840_write:DLL value is %x", Data);
1506
1507 Data = 0x0;
1508 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1509 dbg("mos7840_write:DLM value is %x", Data);
1510
1511 Data = Data & ~SERIAL_LCR_DLAB;
1512 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1513 mos7840_port->shadowLCR);
1514 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1515#endif
1516
1517 if (mos7840_port_paranoia_check(port, __func__)) {
1518 dbg("%s", "Port Paranoia failed");
1519 return -1;
1520 }
1521
1522 serial = port->serial;
1523 if (mos7840_serial_paranoia_check(serial, __func__)) {
1524 dbg("%s", "Serial Paranoia failed");
1525 return -1;
1526 }
1527
1528 mos7840_port = mos7840_get_port_private(port);
1529 if (mos7840_port == NULL) {
1530 dbg("%s", "mos7840_port is NULL");
1531 return -1;
1532 }
1533
1534 /* try to find a free urb in the list */
1535 urb = NULL;
1536
1537 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1538 for (i = 0; i < NUM_URBS; ++i) {
1539 if (!mos7840_port->busy[i]) {
1540 mos7840_port->busy[i] = 1;
1541 urb = mos7840_port->write_urb_pool[i];
1542 dbg("URB:%d", i);
1543 break;
1544 }
1545 }
1546 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1547
1548 if (urb == NULL) {
1549 dbg("%s - no more free urbs", __func__);
1550 goto exit;
1551 }
1552
1553 if (urb->transfer_buffer == NULL) {
1554 urb->transfer_buffer =
1555 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1556
1557 if (urb->transfer_buffer == NULL) {
1558 dev_err_console(port, "%s no more kernel memory...\n",
1559 __func__);
1560 goto exit;
1561 }
1562 }
1563 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1564
1565 memcpy(urb->transfer_buffer, current_position, transfer_size);
1566
1567 /* fill urb with data and submit */
1568 if ((serial->num_ports == 2)
1569 && ((((__u16)port->number -
1570 (__u16)(port->serial->minor)) % 2) != 0)) {
1571 usb_fill_bulk_urb(urb,
1572 serial->dev,
1573 usb_sndbulkpipe(serial->dev,
1574 (port->bulk_out_endpointAddress) + 2),
1575 urb->transfer_buffer,
1576 transfer_size,
1577 mos7840_bulk_out_data_callback, mos7840_port);
1578 } else {
1579 usb_fill_bulk_urb(urb,
1580 serial->dev,
1581 usb_sndbulkpipe(serial->dev,
1582 port->bulk_out_endpointAddress),
1583 urb->transfer_buffer,
1584 transfer_size,
1585 mos7840_bulk_out_data_callback, mos7840_port);
1586 }
1587
1588 data1 = urb->transfer_buffer;
1589 dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1590
1591 /* Turn on LED */
1592 if (mos7840_port->has_led && !mos7840_port->led_flag) {
1593 mos7840_port->led_flag = true;
1594 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0301);
1595 mod_timer(&mos7840_port->led_timer1,
1596 jiffies + msecs_to_jiffies(LED_ON_MS));
1597 }
1598
1599 /* send it down the pipe */
1600 status = usb_submit_urb(urb, GFP_ATOMIC);
1601
1602 if (status) {
1603 mos7840_port->busy[i] = 0;
1604 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1605 "with status = %d\n", __func__, status);
1606 bytes_sent = status;
1607 goto exit;
1608 }
1609 bytes_sent = transfer_size;
1610 mos7840_port->icount.tx += transfer_size;
1611 smp_wmb();
1612 dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1613exit:
1614 return bytes_sent;
1615
1616}
1617
1618/*****************************************************************************
1619 * mos7840_throttle
1620 * this function is called by the tty driver when it wants to stop the data
1621 * being read from the port.
1622 *****************************************************************************/
1623
1624static void mos7840_throttle(struct tty_struct *tty)
1625{
1626 struct usb_serial_port *port = tty->driver_data;
1627 struct moschip_port *mos7840_port;
1628 int status;
1629
1630 if (mos7840_port_paranoia_check(port, __func__)) {
1631 dbg("%s", "Invalid port");
1632 return;
1633 }
1634
1635 dbg("- port %d", port->number);
1636
1637 mos7840_port = mos7840_get_port_private(port);
1638
1639 if (mos7840_port == NULL)
1640 return;
1641
1642 if (!mos7840_port->open) {
1643 dbg("%s", "port not opened");
1644 return;
1645 }
1646
1647 /* if we are implementing XON/XOFF, send the stop character */
1648 if (I_IXOFF(tty)) {
1649 unsigned char stop_char = STOP_CHAR(tty);
1650 status = mos7840_write(tty, port, &stop_char, 1);
1651 if (status <= 0)
1652 return;
1653 }
1654 /* if we are implementing RTS/CTS, toggle that line */
1655 if (tty->termios->c_cflag & CRTSCTS) {
1656 mos7840_port->shadowMCR &= ~MCR_RTS;
1657 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1658 mos7840_port->shadowMCR);
1659 if (status < 0)
1660 return;
1661 }
1662}
1663
1664/*****************************************************************************
1665 * mos7840_unthrottle
1666 * this function is called by the tty driver when it wants to resume
1667 * the data being read from the port (called after mos7840_throttle is
1668 * called)
1669 *****************************************************************************/
1670static void mos7840_unthrottle(struct tty_struct *tty)
1671{
1672 struct usb_serial_port *port = tty->driver_data;
1673 int status;
1674 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1675
1676 if (mos7840_port_paranoia_check(port, __func__)) {
1677 dbg("%s", "Invalid port");
1678 return;
1679 }
1680
1681 if (mos7840_port == NULL)
1682 return;
1683
1684 if (!mos7840_port->open) {
1685 dbg("%s - port not opened", __func__);
1686 return;
1687 }
1688
1689 /* if we are implementing XON/XOFF, send the start character */
1690 if (I_IXOFF(tty)) {
1691 unsigned char start_char = START_CHAR(tty);
1692 status = mos7840_write(tty, port, &start_char, 1);
1693 if (status <= 0)
1694 return;
1695 }
1696
1697 /* if we are implementing RTS/CTS, toggle that line */
1698 if (tty->termios->c_cflag & CRTSCTS) {
1699 mos7840_port->shadowMCR |= MCR_RTS;
1700 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1701 mos7840_port->shadowMCR);
1702 if (status < 0)
1703 return;
1704 }
1705}
1706
1707static int mos7840_tiocmget(struct tty_struct *tty)
1708{
1709 struct usb_serial_port *port = tty->driver_data;
1710 struct moschip_port *mos7840_port;
1711 unsigned int result;
1712 __u16 msr;
1713 __u16 mcr;
1714 int status;
1715 mos7840_port = mos7840_get_port_private(port);
1716
1717 if (mos7840_port == NULL)
1718 return -ENODEV;
1719
1720 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1721 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1722 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1723 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1724 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1725 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1726 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1727 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1728 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1729
1730 dbg("%s - 0x%04X", __func__, result);
1731
1732 return result;
1733}
1734
1735static int mos7840_tiocmset(struct tty_struct *tty,
1736 unsigned int set, unsigned int clear)
1737{
1738 struct usb_serial_port *port = tty->driver_data;
1739 struct moschip_port *mos7840_port;
1740 unsigned int mcr;
1741 int status;
1742
1743 mos7840_port = mos7840_get_port_private(port);
1744
1745 if (mos7840_port == NULL)
1746 return -ENODEV;
1747
1748 /* FIXME: What locks the port registers ? */
1749 mcr = mos7840_port->shadowMCR;
1750 if (clear & TIOCM_RTS)
1751 mcr &= ~MCR_RTS;
1752 if (clear & TIOCM_DTR)
1753 mcr &= ~MCR_DTR;
1754 if (clear & TIOCM_LOOP)
1755 mcr &= ~MCR_LOOPBACK;
1756
1757 if (set & TIOCM_RTS)
1758 mcr |= MCR_RTS;
1759 if (set & TIOCM_DTR)
1760 mcr |= MCR_DTR;
1761 if (set & TIOCM_LOOP)
1762 mcr |= MCR_LOOPBACK;
1763
1764 mos7840_port->shadowMCR = mcr;
1765
1766 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1767 if (status < 0) {
1768 dbg("setting MODEM_CONTROL_REGISTER Failed");
1769 return status;
1770 }
1771
1772 return 0;
1773}
1774
1775/*****************************************************************************
1776 * mos7840_calc_baud_rate_divisor
1777 * this function calculates the proper baud rate divisor for the specified
1778 * baud rate.
1779 *****************************************************************************/
1780static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1781 __u16 *clk_sel_val)
1782{
1783 dbg("%s - %d", __func__, baudRate);
1784
1785 if (baudRate <= 115200) {
1786 *divisor = 115200 / baudRate;
1787 *clk_sel_val = 0x0;
1788 }
1789 if ((baudRate > 115200) && (baudRate <= 230400)) {
1790 *divisor = 230400 / baudRate;
1791 *clk_sel_val = 0x10;
1792 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1793 *divisor = 403200 / baudRate;
1794 *clk_sel_val = 0x20;
1795 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1796 *divisor = 460800 / baudRate;
1797 *clk_sel_val = 0x30;
1798 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1799 *divisor = 806400 / baudRate;
1800 *clk_sel_val = 0x40;
1801 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1802 *divisor = 921600 / baudRate;
1803 *clk_sel_val = 0x50;
1804 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1805 *divisor = 1572864 / baudRate;
1806 *clk_sel_val = 0x60;
1807 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1808 *divisor = 3145728 / baudRate;
1809 *clk_sel_val = 0x70;
1810 }
1811 return 0;
1812
1813#ifdef NOTMCS7840
1814
1815 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1816 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1817 *divisor = mos7840_divisor_table[i].Divisor;
1818 return 0;
1819 }
1820 }
1821
1822 /* After trying for all the standard baud rates *
1823 * Try calculating the divisor for this baud rate */
1824
1825 if (baudrate > 75 && baudrate < 230400) {
1826 /* get the divisor */
1827 custom = (__u16) (230400L / baudrate);
1828
1829 /* Check for round off */
1830 round1 = (__u16) (2304000L / baudrate);
1831 round = (__u16) (round1 - (custom * 10));
1832 if (round > 4)
1833 custom++;
1834 *divisor = custom;
1835
1836 dbg(" Baud %d = %d", baudrate, custom);
1837 return 0;
1838 }
1839
1840 dbg("%s", " Baud calculation Failed...");
1841 return -1;
1842#endif
1843}
1844
1845/*****************************************************************************
1846 * mos7840_send_cmd_write_baud_rate
1847 * this function sends the proper command to change the baud rate of the
1848 * specified port.
1849 *****************************************************************************/
1850
1851static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1852 int baudRate)
1853{
1854 int divisor = 0;
1855 int status;
1856 __u16 Data;
1857 unsigned char number;
1858 __u16 clk_sel_val;
1859 struct usb_serial_port *port;
1860
1861 if (mos7840_port == NULL)
1862 return -1;
1863
1864 port = (struct usb_serial_port *)mos7840_port->port;
1865 if (mos7840_port_paranoia_check(port, __func__)) {
1866 dbg("%s", "Invalid port");
1867 return -1;
1868 }
1869
1870 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1871 dbg("%s", "Invalid Serial");
1872 return -1;
1873 }
1874
1875 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1876
1877 dbg("%s - port = %d, baud = %d", __func__,
1878 mos7840_port->port->number, baudRate);
1879 /* reset clk_uart_sel in spregOffset */
1880 if (baudRate > 115200) {
1881#ifdef HW_flow_control
1882 /* NOTE: need to see the pther register to modify */
1883 /* setting h/w flow control bit to 1 */
1884 Data = 0x2b;
1885 mos7840_port->shadowMCR = Data;
1886 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1887 Data);
1888 if (status < 0) {
1889 dbg("Writing spreg failed in set_serial_baud");
1890 return -1;
1891 }
1892#endif
1893
1894 } else {
1895#ifdef HW_flow_control
1896 /* setting h/w flow control bit to 0 */
1897 Data = 0xb;
1898 mos7840_port->shadowMCR = Data;
1899 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1900 Data);
1901 if (status < 0) {
1902 dbg("Writing spreg failed in set_serial_baud");
1903 return -1;
1904 }
1905#endif
1906
1907 }
1908
1909 if (1) { /* baudRate <= 115200) */
1910 clk_sel_val = 0x0;
1911 Data = 0x0;
1912 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1913 &clk_sel_val);
1914 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1915 &Data);
1916 if (status < 0) {
1917 dbg("reading spreg failed in set_serial_baud");
1918 return -1;
1919 }
1920 Data = (Data & 0x8f) | clk_sel_val;
1921 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1922 Data);
1923 if (status < 0) {
1924 dbg("Writing spreg failed in set_serial_baud");
1925 return -1;
1926 }
1927 /* Calculate the Divisor */
1928
1929 if (status) {
1930 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1931 return status;
1932 }
1933 /* Enable access to divisor latch */
1934 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1935 mos7840_port->shadowLCR = Data;
1936 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1937
1938 /* Write the divisor */
1939 Data = (unsigned char)(divisor & 0xff);
1940 dbg("set_serial_baud Value to write DLL is %x", Data);
1941 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1942
1943 Data = (unsigned char)((divisor & 0xff00) >> 8);
1944 dbg("set_serial_baud Value to write DLM is %x", Data);
1945 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1946
1947 /* Disable access to divisor latch */
1948 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1949 mos7840_port->shadowLCR = Data;
1950 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1951
1952 }
1953 return status;
1954}
1955
1956/*****************************************************************************
1957 * mos7840_change_port_settings
1958 * This routine is called to set the UART on the device to match
1959 * the specified new settings.
1960 *****************************************************************************/
1961
1962static void mos7840_change_port_settings(struct tty_struct *tty,
1963 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1964{
1965 int baud;
1966 unsigned cflag;
1967 unsigned iflag;
1968 __u8 lData;
1969 __u8 lParity;
1970 __u8 lStop;
1971 int status;
1972 __u16 Data;
1973 struct usb_serial_port *port;
1974 struct usb_serial *serial;
1975
1976 if (mos7840_port == NULL)
1977 return;
1978
1979 port = (struct usb_serial_port *)mos7840_port->port;
1980
1981 if (mos7840_port_paranoia_check(port, __func__)) {
1982 dbg("%s", "Invalid port");
1983 return;
1984 }
1985
1986 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1987 dbg("%s", "Invalid Serial");
1988 return;
1989 }
1990
1991 serial = port->serial;
1992
1993 dbg("%s - port %d", __func__, mos7840_port->port->number);
1994
1995 if (!mos7840_port->open) {
1996 dbg("%s - port not opened", __func__);
1997 return;
1998 }
1999
2000 lData = LCR_BITS_8;
2001 lStop = LCR_STOP_1;
2002 lParity = LCR_PAR_NONE;
2003
2004 cflag = tty->termios->c_cflag;
2005 iflag = tty->termios->c_iflag;
2006
2007 /* Change the number of bits */
2008 if (cflag & CSIZE) {
2009 switch (cflag & CSIZE) {
2010 case CS5:
2011 lData = LCR_BITS_5;
2012 break;
2013
2014 case CS6:
2015 lData = LCR_BITS_6;
2016 break;
2017
2018 case CS7:
2019 lData = LCR_BITS_7;
2020 break;
2021 default:
2022 case CS8:
2023 lData = LCR_BITS_8;
2024 break;
2025 }
2026 }
2027 /* Change the Parity bit */
2028 if (cflag & PARENB) {
2029 if (cflag & PARODD) {
2030 lParity = LCR_PAR_ODD;
2031 dbg("%s - parity = odd", __func__);
2032 } else {
2033 lParity = LCR_PAR_EVEN;
2034 dbg("%s - parity = even", __func__);
2035 }
2036
2037 } else {
2038 dbg("%s - parity = none", __func__);
2039 }
2040
2041 if (cflag & CMSPAR)
2042 lParity = lParity | 0x20;
2043
2044 /* Change the Stop bit */
2045 if (cflag & CSTOPB) {
2046 lStop = LCR_STOP_2;
2047 dbg("%s - stop bits = 2", __func__);
2048 } else {
2049 lStop = LCR_STOP_1;
2050 dbg("%s - stop bits = 1", __func__);
2051 }
2052
2053 /* Update the LCR with the correct value */
2054 mos7840_port->shadowLCR &=
2055 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2056 mos7840_port->shadowLCR |= (lData | lParity | lStop);
2057
2058 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2059 mos7840_port->shadowLCR);
2060 /* Disable Interrupts */
2061 Data = 0x00;
2062 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2063
2064 Data = 0x00;
2065 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2066
2067 Data = 0xcf;
2068 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2069
2070 /* Send the updated LCR value to the mos7840 */
2071 Data = mos7840_port->shadowLCR;
2072
2073 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2074
2075 Data = 0x00b;
2076 mos7840_port->shadowMCR = Data;
2077 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2078 Data = 0x00b;
2079 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2080
2081 /* set up the MCR register and send it to the mos7840 */
2082
2083 mos7840_port->shadowMCR = MCR_MASTER_IE;
2084 if (cflag & CBAUD)
2085 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2086
2087 if (cflag & CRTSCTS)
2088 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2089 else
2090 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2091
2092 Data = mos7840_port->shadowMCR;
2093 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2094
2095 /* Determine divisor based on baud rate */
2096 baud = tty_get_baud_rate(tty);
2097
2098 if (!baud) {
2099 /* pick a default, any default... */
2100 dbg("%s", "Picked default baud...");
2101 baud = 9600;
2102 }
2103
2104 dbg("%s - baud rate = %d", __func__, baud);
2105 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2106
2107 /* Enable Interrupts */
2108 Data = 0x0c;
2109 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2110
2111 if (mos7840_port->read_urb_busy == false) {
2112 mos7840_port->read_urb_busy = true;
2113 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2114 if (status) {
2115 dbg("usb_submit_urb(read bulk) failed, status = %d",
2116 status);
2117 mos7840_port->read_urb_busy = false;
2118 }
2119 }
2120 wake_up(&mos7840_port->delta_msr_wait);
2121 mos7840_port->delta_msr_cond = 1;
2122 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2123 mos7840_port->shadowLCR);
2124}
2125
2126/*****************************************************************************
2127 * mos7840_set_termios
2128 * this function is called by the tty driver when it wants to change
2129 * the termios structure
2130 *****************************************************************************/
2131
2132static void mos7840_set_termios(struct tty_struct *tty,
2133 struct usb_serial_port *port,
2134 struct ktermios *old_termios)
2135{
2136 int status;
2137 unsigned int cflag;
2138 struct usb_serial *serial;
2139 struct moschip_port *mos7840_port;
2140
2141 if (mos7840_port_paranoia_check(port, __func__)) {
2142 dbg("%s", "Invalid port");
2143 return;
2144 }
2145
2146 serial = port->serial;
2147
2148 if (mos7840_serial_paranoia_check(serial, __func__)) {
2149 dbg("%s", "Invalid Serial");
2150 return;
2151 }
2152
2153 mos7840_port = mos7840_get_port_private(port);
2154
2155 if (mos7840_port == NULL)
2156 return;
2157
2158 if (!mos7840_port->open) {
2159 dbg("%s - port not opened", __func__);
2160 return;
2161 }
2162
2163 dbg("%s", "setting termios - ");
2164
2165 cflag = tty->termios->c_cflag;
2166
2167 dbg("%s - clfag %08x iflag %08x", __func__,
2168 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2169 dbg("%s - old clfag %08x old iflag %08x", __func__,
2170 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2171 dbg("%s - port %d", __func__, port->number);
2172
2173 /* change the port settings to the new ones specified */
2174
2175 mos7840_change_port_settings(tty, mos7840_port, old_termios);
2176
2177 if (!mos7840_port->read_urb) {
2178 dbg("%s", "URB KILLED !!!!!");
2179 return;
2180 }
2181
2182 if (mos7840_port->read_urb_busy == false) {
2183 mos7840_port->read_urb_busy = true;
2184 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2185 if (status) {
2186 dbg("usb_submit_urb(read bulk) failed, status = %d",
2187 status);
2188 mos7840_port->read_urb_busy = false;
2189 }
2190 }
2191}
2192
2193/*****************************************************************************
2194 * mos7840_get_lsr_info - get line status register info
2195 *
2196 * Purpose: Let user call ioctl() to get info when the UART physically
2197 * is emptied. On bus types like RS485, the transmitter must
2198 * release the bus after transmitting. This must be done when
2199 * the transmit shift register is empty, not be done when the
2200 * transmit holding register is empty. This functionality
2201 * allows an RS485 driver to be written in user space.
2202 *****************************************************************************/
2203
2204static int mos7840_get_lsr_info(struct tty_struct *tty,
2205 unsigned int __user *value)
2206{
2207 int count;
2208 unsigned int result = 0;
2209
2210 count = mos7840_chars_in_buffer(tty);
2211 if (count == 0) {
2212 dbg("%s -- Empty", __func__);
2213 result = TIOCSER_TEMT;
2214 }
2215
2216 if (copy_to_user(value, &result, sizeof(int)))
2217 return -EFAULT;
2218 return 0;
2219}
2220
2221/*****************************************************************************
2222 * mos7840_get_serial_info
2223 * function to get information about serial port
2224 *****************************************************************************/
2225
2226static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2227 struct serial_struct __user *retinfo)
2228{
2229 struct serial_struct tmp;
2230
2231 if (mos7840_port == NULL)
2232 return -1;
2233
2234 if (!retinfo)
2235 return -EFAULT;
2236
2237 memset(&tmp, 0, sizeof(tmp));
2238
2239 tmp.type = PORT_16550A;
2240 tmp.line = mos7840_port->port->serial->minor;
2241 tmp.port = mos7840_port->port->number;
2242 tmp.irq = 0;
2243 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2244 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2245 tmp.baud_base = 9600;
2246 tmp.close_delay = 5 * HZ;
2247 tmp.closing_wait = 30 * HZ;
2248
2249 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2250 return -EFAULT;
2251 return 0;
2252}
2253
2254static int mos7840_get_icount(struct tty_struct *tty,
2255 struct serial_icounter_struct *icount)
2256{
2257 struct usb_serial_port *port = tty->driver_data;
2258 struct moschip_port *mos7840_port;
2259 struct async_icount cnow;
2260
2261 mos7840_port = mos7840_get_port_private(port);
2262 cnow = mos7840_port->icount;
2263
2264 smp_rmb();
2265 icount->cts = cnow.cts;
2266 icount->dsr = cnow.dsr;
2267 icount->rng = cnow.rng;
2268 icount->dcd = cnow.dcd;
2269 icount->rx = cnow.rx;
2270 icount->tx = cnow.tx;
2271 icount->frame = cnow.frame;
2272 icount->overrun = cnow.overrun;
2273 icount->parity = cnow.parity;
2274 icount->brk = cnow.brk;
2275 icount->buf_overrun = cnow.buf_overrun;
2276
2277 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2278 port->number, icount->rx, icount->tx);
2279 return 0;
2280}
2281
2282/*****************************************************************************
2283 * SerialIoctl
2284 * this function handles any ioctl calls to the driver
2285 *****************************************************************************/
2286
2287static int mos7840_ioctl(struct tty_struct *tty,
2288 unsigned int cmd, unsigned long arg)
2289{
2290 struct usb_serial_port *port = tty->driver_data;
2291 void __user *argp = (void __user *)arg;
2292 struct moschip_port *mos7840_port;
2293
2294 struct async_icount cnow;
2295 struct async_icount cprev;
2296
2297 if (mos7840_port_paranoia_check(port, __func__)) {
2298 dbg("%s", "Invalid port");
2299 return -1;
2300 }
2301
2302 mos7840_port = mos7840_get_port_private(port);
2303
2304 if (mos7840_port == NULL)
2305 return -1;
2306
2307 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2308
2309 switch (cmd) {
2310 /* return number of bytes available */
2311
2312 case TIOCSERGETLSR:
2313 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2314 return mos7840_get_lsr_info(tty, argp);
2315
2316 case TIOCGSERIAL:
2317 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2318 return mos7840_get_serial_info(mos7840_port, argp);
2319
2320 case TIOCSSERIAL:
2321 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2322 break;
2323
2324 case TIOCMIWAIT:
2325 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2326 cprev = mos7840_port->icount;
2327 while (1) {
2328 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2329 mos7840_port->delta_msr_cond = 0;
2330 wait_event_interruptible(mos7840_port->delta_msr_wait,
2331 (mos7840_port->
2332 delta_msr_cond == 1));
2333
2334 /* see if a signal did it */
2335 if (signal_pending(current))
2336 return -ERESTARTSYS;
2337 cnow = mos7840_port->icount;
2338 smp_rmb();
2339 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2340 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2341 return -EIO; /* no change => error */
2342 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2343 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2344 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2345 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2346 return 0;
2347 }
2348 cprev = cnow;
2349 }
2350 /* NOTREACHED */
2351 break;
2352
2353 default:
2354 break;
2355 }
2356 return -ENOIOCTLCMD;
2357}
2358
2359static int mos7810_check(struct usb_serial *serial)
2360{
2361 int i, pass_count = 0;
2362 __u16 data = 0, mcr_data = 0;
2363 __u16 test_pattern = 0x55AA;
2364
2365 /* Store MCR setting */
2366 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2367 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2368 &mcr_data, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2369
2370 for (i = 0; i < 16; i++) {
2371 /* Send the 1-bit test pattern out to MCS7810 test pin */
2372 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2373 MCS_WRREQ, MCS_WR_RTYPE,
2374 (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2375 MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2376
2377 /* Read the test pattern back */
2378 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2379 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2380 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2381
2382 /* If this is a MCS7810 device, both test patterns must match */
2383 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2384 break;
2385
2386 pass_count++;
2387 }
2388
2389 /* Restore MCR setting */
2390 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2391 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2392 0, MOS_WDR_TIMEOUT);
2393
2394 if (pass_count == 16)
2395 return 1;
2396
2397 return 0;
2398}
2399
2400static int mos7840_calc_num_ports(struct usb_serial *serial)
2401{
2402 __u16 data = 0x00;
2403 int mos7840_num_ports;
2404
2405 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2406 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, &data,
2407 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2408
2409 if (serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7810 ||
2410 serial->dev->descriptor.idProduct == MOSCHIP_DEVICE_ID_7820) {
2411 device_type = serial->dev->descriptor.idProduct;
2412 } else {
2413 /* For a MCS7840 device GPIO0 must be set to 1 */
2414 if ((data & 0x01) == 1)
2415 device_type = MOSCHIP_DEVICE_ID_7840;
2416 else if (mos7810_check(serial))
2417 device_type = MOSCHIP_DEVICE_ID_7810;
2418 else
2419 device_type = MOSCHIP_DEVICE_ID_7820;
2420 }
2421
2422 mos7840_num_ports = (device_type >> 4) & 0x000F;
2423 serial->num_bulk_in = mos7840_num_ports;
2424 serial->num_bulk_out = mos7840_num_ports;
2425 serial->num_ports = mos7840_num_ports;
2426
2427 return mos7840_num_ports;
2428}
2429
2430/****************************************************************************
2431 * mos7840_startup
2432 ****************************************************************************/
2433
2434static int mos7840_startup(struct usb_serial *serial)
2435{
2436 struct moschip_port *mos7840_port;
2437 struct usb_device *dev;
2438 int i, status;
2439 __u16 Data;
2440
2441 if (!serial) {
2442 dbg("%s", "Invalid Handler");
2443 return -1;
2444 }
2445
2446 dev = serial->dev;
2447
2448 /* we set up the pointers to the endpoints in the mos7840_open *
2449 * function, as the structures aren't created yet. */
2450
2451 /* set up port private structures */
2452 for (i = 0; i < serial->num_ports; ++i) {
2453 dbg ("mos7840_startup: configuring port %d............", i);
2454 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2455 if (mos7840_port == NULL) {
2456 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2457 status = -ENOMEM;
2458 i--; /* don't follow NULL pointer cleaning up */
2459 goto error;
2460 }
2461
2462 /* Initialize all port interrupt end point to port 0 int
2463 * endpoint. Our device has only one interrupt end point
2464 * common to all port */
2465
2466 mos7840_port->port = serial->port[i];
2467 mos7840_set_port_private(serial->port[i], mos7840_port);
2468 spin_lock_init(&mos7840_port->pool_lock);
2469
2470 /* minor is not initialised until later by
2471 * usb-serial.c:get_free_serial() and cannot therefore be used
2472 * to index device instances */
2473 mos7840_port->port_num = i + 1;
2474 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2475 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2476 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2477 dbg ("serial->minor = %d", serial->minor);
2478
2479 if (mos7840_port->port_num == 1) {
2480 mos7840_port->SpRegOffset = 0x0;
2481 mos7840_port->ControlRegOffset = 0x1;
2482 mos7840_port->DcrRegOffset = 0x4;
2483 } else if ((mos7840_port->port_num == 2)
2484 && (serial->num_ports == 4)) {
2485 mos7840_port->SpRegOffset = 0x8;
2486 mos7840_port->ControlRegOffset = 0x9;
2487 mos7840_port->DcrRegOffset = 0x16;
2488 } else if ((mos7840_port->port_num == 2)
2489 && (serial->num_ports == 2)) {
2490 mos7840_port->SpRegOffset = 0xa;
2491 mos7840_port->ControlRegOffset = 0xb;
2492 mos7840_port->DcrRegOffset = 0x19;
2493 } else if ((mos7840_port->port_num == 3)
2494 && (serial->num_ports == 4)) {
2495 mos7840_port->SpRegOffset = 0xa;
2496 mos7840_port->ControlRegOffset = 0xb;
2497 mos7840_port->DcrRegOffset = 0x19;
2498 } else if ((mos7840_port->port_num == 4)
2499 && (serial->num_ports == 4)) {
2500 mos7840_port->SpRegOffset = 0xc;
2501 mos7840_port->ControlRegOffset = 0xd;
2502 mos7840_port->DcrRegOffset = 0x1c;
2503 }
2504 mos7840_dump_serial_port(mos7840_port);
2505 mos7840_set_port_private(serial->port[i], mos7840_port);
2506
2507 /* enable rx_disable bit in control register */
2508 status = mos7840_get_reg_sync(serial->port[i],
2509 mos7840_port->ControlRegOffset, &Data);
2510 if (status < 0) {
2511 dbg("Reading ControlReg failed status-0x%x", status);
2512 break;
2513 } else
2514 dbg("ControlReg Reading success val is %x, status%d",
2515 Data, status);
2516 Data |= 0x08; /* setting driver done bit */
2517 Data |= 0x04; /* sp1_bit to have cts change reflect in
2518 modem status reg */
2519
2520 /* Data |= 0x20; //rx_disable bit */
2521 status = mos7840_set_reg_sync(serial->port[i],
2522 mos7840_port->ControlRegOffset, Data);
2523 if (status < 0) {
2524 dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2525 break;
2526 } else
2527 dbg("ControlReg Writing success(rx_disable) status%d",
2528 status);
2529
2530 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2531 and 0x24 in DCR3 */
2532 Data = 0x01;
2533 status = mos7840_set_reg_sync(serial->port[i],
2534 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2535 if (status < 0) {
2536 dbg("Writing DCR0 failed status-0x%x", status);
2537 break;
2538 } else
2539 dbg("DCR0 Writing success status%d", status);
2540
2541 Data = 0x05;
2542 status = mos7840_set_reg_sync(serial->port[i],
2543 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2544 if (status < 0) {
2545 dbg("Writing DCR1 failed status-0x%x", status);
2546 break;
2547 } else
2548 dbg("DCR1 Writing success status%d", status);
2549
2550 Data = 0x24;
2551 status = mos7840_set_reg_sync(serial->port[i],
2552 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2553 if (status < 0) {
2554 dbg("Writing DCR2 failed status-0x%x", status);
2555 break;
2556 } else
2557 dbg("DCR2 Writing success status%d", status);
2558
2559 /* write values in clkstart0x0 and clkmulti 0x20 */
2560 Data = 0x0;
2561 status = mos7840_set_reg_sync(serial->port[i],
2562 CLK_START_VALUE_REGISTER, Data);
2563 if (status < 0) {
2564 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2565 break;
2566 } else
2567 dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2568
2569 Data = 0x20;
2570 status = mos7840_set_reg_sync(serial->port[i],
2571 CLK_MULTI_REGISTER, Data);
2572 if (status < 0) {
2573 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2574 status);
2575 goto error;
2576 } else
2577 dbg("CLK_MULTI_REGISTER Writing success status%d",
2578 status);
2579
2580 /* write value 0x0 to scratchpad register */
2581 Data = 0x00;
2582 status = mos7840_set_uart_reg(serial->port[i],
2583 SCRATCH_PAD_REGISTER, Data);
2584 if (status < 0) {
2585 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2586 status);
2587 break;
2588 } else
2589 dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2590 status);
2591
2592 /* Zero Length flag register */
2593 if ((mos7840_port->port_num != 1)
2594 && (serial->num_ports == 2)) {
2595
2596 Data = 0xff;
2597 status = mos7840_set_reg_sync(serial->port[i],
2598 (__u16) (ZLP_REG1 +
2599 ((__u16)mos7840_port->port_num)), Data);
2600 dbg("ZLIP offset %x",
2601 (__u16) (ZLP_REG1 +
2602 ((__u16) mos7840_port->port_num)));
2603 if (status < 0) {
2604 dbg("Writing ZLP_REG%d failed status-0x%x",
2605 i + 2, status);
2606 break;
2607 } else
2608 dbg("ZLP_REG%d Writing success status%d",
2609 i + 2, status);
2610 } else {
2611 Data = 0xff;
2612 status = mos7840_set_reg_sync(serial->port[i],
2613 (__u16) (ZLP_REG1 +
2614 ((__u16)mos7840_port->port_num) - 0x1), Data);
2615 dbg("ZLIP offset %x",
2616 (__u16) (ZLP_REG1 +
2617 ((__u16) mos7840_port->port_num) - 0x1));
2618 if (status < 0) {
2619 dbg("Writing ZLP_REG%d failed status-0x%x",
2620 i + 1, status);
2621 break;
2622 } else
2623 dbg("ZLP_REG%d Writing success status%d",
2624 i + 1, status);
2625
2626 }
2627 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2628 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2629 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2630 GFP_KERNEL);
2631 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2632 !mos7840_port->dr) {
2633 status = -ENOMEM;
2634 goto error;
2635 }
2636
2637 mos7840_port->has_led = false;
2638
2639 /* Initialize LED timers */
2640 if (device_type == MOSCHIP_DEVICE_ID_7810) {
2641 mos7840_port->has_led = true;
2642
2643 init_timer(&mos7840_port->led_timer1);
2644 mos7840_port->led_timer1.function = mos7840_led_off;
2645 mos7840_port->led_timer1.expires =
2646 jiffies + msecs_to_jiffies(LED_ON_MS);
2647 mos7840_port->led_timer1.data =
2648 (unsigned long)mos7840_port;
2649
2650 init_timer(&mos7840_port->led_timer2);
2651 mos7840_port->led_timer2.function =
2652 mos7840_led_flag_off;
2653 mos7840_port->led_timer2.expires =
2654 jiffies + msecs_to_jiffies(LED_OFF_MS);
2655 mos7840_port->led_timer2.data =
2656 (unsigned long)mos7840_port;
2657
2658 mos7840_port->led_flag = false;
2659
2660 /* Turn off LED */
2661 mos7840_set_led_sync(serial->port[i],
2662 MODEM_CONTROL_REGISTER, 0x0300);
2663 }
2664 }
2665 dbg ("mos7840_startup: all ports configured...........");
2666
2667 /* Zero Length flag enable */
2668 Data = 0x0f;
2669 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2670 if (status < 0) {
2671 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2672 goto error;
2673 } else
2674 dbg("ZLP_REG5 Writing success status%d", status);
2675
2676 /* setting configuration feature to one */
2677 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2678 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2679 return 0;
2680error:
2681 for (/* nothing */; i >= 0; i--) {
2682 mos7840_port = mos7840_get_port_private(serial->port[i]);
2683
2684 kfree(mos7840_port->dr);
2685 kfree(mos7840_port->ctrl_buf);
2686 usb_free_urb(mos7840_port->control_urb);
2687 kfree(mos7840_port);
2688 serial->port[i] = NULL;
2689 }
2690 return status;
2691}
2692
2693/****************************************************************************
2694 * mos7840_disconnect
2695 * This function is called whenever the device is removed from the usb bus.
2696 ****************************************************************************/
2697
2698static void mos7840_disconnect(struct usb_serial *serial)
2699{
2700 int i;
2701 unsigned long flags;
2702 struct moschip_port *mos7840_port;
2703
2704 if (!serial) {
2705 dbg("%s", "Invalid Handler");
2706 return;
2707 }
2708
2709 /* check for the ports to be closed,close the ports and disconnect */
2710
2711 /* free private structure allocated for serial port *
2712 * stop reads and writes on all ports */
2713
2714 for (i = 0; i < serial->num_ports; ++i) {
2715 mos7840_port = mos7840_get_port_private(serial->port[i]);
2716 dbg ("mos7840_port %d = %p", i, mos7840_port);
2717 if (mos7840_port) {
2718 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2719 mos7840_port->zombie = 1;
2720 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2721 usb_kill_urb(mos7840_port->control_urb);
2722 }
2723 }
2724}
2725
2726/****************************************************************************
2727 * mos7840_release
2728 * This function is called when the usb_serial structure is freed.
2729 ****************************************************************************/
2730
2731static void mos7840_release(struct usb_serial *serial)
2732{
2733 int i;
2734 struct moschip_port *mos7840_port;
2735
2736 if (!serial) {
2737 dbg("%s", "Invalid Handler");
2738 return;
2739 }
2740
2741 /* check for the ports to be closed,close the ports and disconnect */
2742
2743 /* free private structure allocated for serial port *
2744 * stop reads and writes on all ports */
2745
2746 for (i = 0; i < serial->num_ports; ++i) {
2747 mos7840_port = mos7840_get_port_private(serial->port[i]);
2748 dbg("mos7840_port %d = %p", i, mos7840_port);
2749 if (mos7840_port) {
2750 if (mos7840_port->has_led) {
2751 /* Turn off LED */
2752 mos7840_set_led_sync(mos7840_port->port,
2753 MODEM_CONTROL_REGISTER, 0x0300);
2754
2755 del_timer_sync(&mos7840_port->led_timer1);
2756 del_timer_sync(&mos7840_port->led_timer2);
2757 }
2758 kfree(mos7840_port->ctrl_buf);
2759 kfree(mos7840_port->dr);
2760 kfree(mos7840_port);
2761 }
2762 }
2763}
2764
2765static struct usb_serial_driver moschip7840_4port_device = {
2766 .driver = {
2767 .owner = THIS_MODULE,
2768 .name = "mos7840",
2769 },
2770 .description = DRIVER_DESC,
2771 .id_table = id_table,
2772 .num_ports = 4,
2773 .open = mos7840_open,
2774 .close = mos7840_close,
2775 .write = mos7840_write,
2776 .write_room = mos7840_write_room,
2777 .chars_in_buffer = mos7840_chars_in_buffer,
2778 .throttle = mos7840_throttle,
2779 .unthrottle = mos7840_unthrottle,
2780 .calc_num_ports = mos7840_calc_num_ports,
2781#ifdef MCSSerialProbe
2782 .probe = mos7840_serial_probe,
2783#endif
2784 .ioctl = mos7840_ioctl,
2785 .set_termios = mos7840_set_termios,
2786 .break_ctl = mos7840_break,
2787 .tiocmget = mos7840_tiocmget,
2788 .tiocmset = mos7840_tiocmset,
2789 .get_icount = mos7840_get_icount,
2790 .attach = mos7840_startup,
2791 .disconnect = mos7840_disconnect,
2792 .release = mos7840_release,
2793 .read_bulk_callback = mos7840_bulk_in_callback,
2794 .read_int_callback = mos7840_interrupt_callback,
2795};
2796
2797static struct usb_serial_driver * const serial_drivers[] = {
2798 &moschip7840_4port_device, NULL
2799};
2800
2801module_usb_serial_driver(serial_drivers, id_table);
2802
2803MODULE_DESCRIPTION(DRIVER_DESC);
2804MODULE_LICENSE("GPL");
2805
2806module_param(debug, bool, S_IRUGO | S_IWUSR);
2807MODULE_PARM_DESC(debug, "Debug enabled or not");