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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/*
93 * Vendor id and device id defines
94 *
95 * NOTE: Do not add new defines, add entries directly to the id_table instead.
96 */
97#define USB_VENDOR_ID_BANDB 0x0856
98#define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
99#define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00
100#define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
101#define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01
102#define BANDB_DEVICE_ID_US9ML2_2 0xAC29
103#define BANDB_DEVICE_ID_US9ML2_4 0xAC30
104#define BANDB_DEVICE_ID_USPTL4_2 0xAC31
105#define BANDB_DEVICE_ID_USPTL4_4 0xAC32
106#define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
107#define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02
108#define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
109#define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
110#define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
111
112/* Interrupt Routine Defines */
113
114#define SERIAL_IIR_RLS 0x06
115#define SERIAL_IIR_MS 0x00
116
117/*
118 * Emulation of the bit mask on the LINE STATUS REGISTER.
119 */
120#define SERIAL_LSR_DR 0x0001
121#define SERIAL_LSR_OE 0x0002
122#define SERIAL_LSR_PE 0x0004
123#define SERIAL_LSR_FE 0x0008
124#define SERIAL_LSR_BI 0x0010
125
126#define MOS_MSR_DELTA_CTS 0x10
127#define MOS_MSR_DELTA_DSR 0x20
128#define MOS_MSR_DELTA_RI 0x40
129#define MOS_MSR_DELTA_CD 0x80
130
131/* Serial Port register Address */
132#define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
133#define FIFO_CONTROL_REGISTER ((__u16)(0x02))
134#define LINE_CONTROL_REGISTER ((__u16)(0x03))
135#define MODEM_CONTROL_REGISTER ((__u16)(0x04))
136#define LINE_STATUS_REGISTER ((__u16)(0x05))
137#define MODEM_STATUS_REGISTER ((__u16)(0x06))
138#define SCRATCH_PAD_REGISTER ((__u16)(0x07))
139#define DIVISOR_LATCH_LSB ((__u16)(0x00))
140#define DIVISOR_LATCH_MSB ((__u16)(0x01))
141
142#define CLK_MULTI_REGISTER ((__u16)(0x02))
143#define CLK_START_VALUE_REGISTER ((__u16)(0x03))
144#define GPIO_REGISTER ((__u16)(0x07))
145
146#define SERIAL_LCR_DLAB ((__u16)(0x0080))
147
148/*
149 * URB POOL related defines
150 */
151#define NUM_URBS 16 /* URB Count */
152#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
153
154/* LED on/off milliseconds*/
155#define LED_ON_MS 500
156#define LED_OFF_MS 500
157
158enum mos7840_flag {
159 MOS7840_FLAG_LED_BUSY,
160};
161
162#define MCS_PORT_MASK GENMASK(2, 0)
163#define MCS_PORTS(nr) ((nr) & MCS_PORT_MASK)
164#define MCS_LED BIT(3)
165
166#define MCS_DEVICE(vid, pid, flags) \
167 USB_DEVICE((vid), (pid)), .driver_info = (flags)
168
169static const struct usb_device_id id_table[] = {
170 { MCS_DEVICE(0x0557, 0x2011, MCS_PORTS(4)) }, /* ATEN UC2324 */
171 { MCS_DEVICE(0x0557, 0x7820, MCS_PORTS(2)) }, /* ATEN UC2322 */
172 { MCS_DEVICE(0x110a, 0x2210, MCS_PORTS(2)) }, /* Moxa UPort 2210 */
173 { MCS_DEVICE(0x9710, 0x7810, MCS_PORTS(1) | MCS_LED) }, /* ASIX MCS7810 */
174 { MCS_DEVICE(0x9710, 0x7820, MCS_PORTS(2)) }, /* MosChip MCS7820 */
175 { MCS_DEVICE(0x9710, 0x7840, MCS_PORTS(4)) }, /* MosChip MCS7840 */
176 { MCS_DEVICE(0x9710, 0x7843, MCS_PORTS(3)) }, /* ASIX MCS7840 3 port */
177 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2) },
178 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P) },
179 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4) },
180 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P) },
181 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2) },
182 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4) },
183 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2) },
184 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4) },
185 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2) },
186 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P) },
187 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4) },
188 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P) },
189 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4) },
190 {} /* terminating entry */
191};
192MODULE_DEVICE_TABLE(usb, id_table);
193
194/* This structure holds all of the local port information */
195
196struct moschip_port {
197 int port_num; /*Actual port number in the device(1,2,etc) */
198 struct urb *read_urb; /* read URB for this port */
199 __u8 shadowLCR; /* last LCR value received */
200 __u8 shadowMCR; /* last MCR value received */
201 struct usb_serial_port *port; /* loop back to the owner of this object */
202
203 /* Offsets */
204 __u8 SpRegOffset;
205 __u8 ControlRegOffset;
206 __u8 DcrRegOffset;
207
208 spinlock_t pool_lock;
209 struct urb *write_urb_pool[NUM_URBS];
210 char busy[NUM_URBS];
211 bool read_urb_busy;
212
213 /* For device(s) with LED indicator */
214 bool has_led;
215 struct timer_list led_timer1; /* Timer for LED on */
216 struct timer_list led_timer2; /* Timer for LED off */
217 struct urb *led_urb;
218 struct usb_ctrlrequest *led_dr;
219
220 unsigned long flags;
221};
222
223/*
224 * mos7840_set_reg_sync
225 * To set the Control register by calling usb_fill_control_urb function
226 * by passing usb_sndctrlpipe function as parameter.
227 */
228
229static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
230 __u16 val)
231{
232 struct usb_device *dev = port->serial->dev;
233 val = val & 0x00ff;
234 dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
235
236 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
237 MCS_WR_RTYPE, val, reg, NULL, 0,
238 MOS_WDR_TIMEOUT);
239}
240
241/*
242 * mos7840_get_reg_sync
243 * To set the Uart register by calling usb_fill_control_urb function by
244 * passing usb_rcvctrlpipe function as parameter.
245 */
246
247static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
248 __u16 *val)
249{
250 struct usb_device *dev = port->serial->dev;
251 int ret = 0;
252 u8 *buf;
253
254 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
255 if (!buf)
256 return -ENOMEM;
257
258 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
259 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
260 MOS_WDR_TIMEOUT);
261 if (ret < VENDOR_READ_LENGTH) {
262 if (ret >= 0)
263 ret = -EIO;
264 goto out;
265 }
266
267 *val = buf[0];
268 dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
269out:
270 kfree(buf);
271 return ret;
272}
273
274/*
275 * mos7840_set_uart_reg
276 * To set the Uart register by calling usb_fill_control_urb function by
277 * passing usb_sndctrlpipe function as parameter.
278 */
279
280static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
281 __u16 val)
282{
283
284 struct usb_device *dev = port->serial->dev;
285 val = val & 0x00ff;
286 /* For the UART control registers, the application number need
287 to be Or'ed */
288 if (port->serial->num_ports == 2 && port->port_number != 0)
289 val |= ((__u16)port->port_number + 2) << 8;
290 else
291 val |= ((__u16)port->port_number + 1) << 8;
292 dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
293 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
294 MCS_WR_RTYPE, val, reg, NULL, 0,
295 MOS_WDR_TIMEOUT);
296
297}
298
299/*
300 * mos7840_get_uart_reg
301 * To set the Control register by calling usb_fill_control_urb function
302 * by passing usb_rcvctrlpipe function as parameter.
303 */
304static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
305 __u16 *val)
306{
307 struct usb_device *dev = port->serial->dev;
308 int ret = 0;
309 __u16 Wval;
310 u8 *buf;
311
312 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
313 if (!buf)
314 return -ENOMEM;
315
316 /* Wval is same as application number */
317 if (port->serial->num_ports == 2 && port->port_number != 0)
318 Wval = ((__u16)port->port_number + 2) << 8;
319 else
320 Wval = ((__u16)port->port_number + 1) << 8;
321 dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
322 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
323 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
324 MOS_WDR_TIMEOUT);
325 if (ret < VENDOR_READ_LENGTH) {
326 if (ret >= 0)
327 ret = -EIO;
328 goto out;
329 }
330 *val = buf[0];
331out:
332 kfree(buf);
333 return ret;
334}
335
336static void mos7840_dump_serial_port(struct usb_serial_port *port,
337 struct moschip_port *mos7840_port)
338{
339
340 dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
341 dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
342 dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
343
344}
345
346/************************************************************************/
347/************************************************************************/
348/* U S B C A L L B A C K F U N C T I O N S */
349/* U S B C A L L B A C K F U N C T I O N S */
350/************************************************************************/
351/************************************************************************/
352
353static void mos7840_set_led_callback(struct urb *urb)
354{
355 switch (urb->status) {
356 case 0:
357 /* Success */
358 break;
359 case -ECONNRESET:
360 case -ENOENT:
361 case -ESHUTDOWN:
362 /* This urb is terminated, clean up */
363 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
364 __func__, urb->status);
365 break;
366 default:
367 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
368 __func__, urb->status);
369 }
370}
371
372static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
373 __u16 reg)
374{
375 struct usb_device *dev = mcs->port->serial->dev;
376 struct usb_ctrlrequest *dr = mcs->led_dr;
377
378 dr->bRequestType = MCS_WR_RTYPE;
379 dr->bRequest = MCS_WRREQ;
380 dr->wValue = cpu_to_le16(wval);
381 dr->wIndex = cpu_to_le16(reg);
382 dr->wLength = cpu_to_le16(0);
383
384 usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
385 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
386
387 usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
388}
389
390static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
391 __u16 val)
392{
393 struct usb_device *dev = port->serial->dev;
394
395 usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
396 val, reg, NULL, 0, MOS_WDR_TIMEOUT);
397}
398
399static void mos7840_led_off(struct timer_list *t)
400{
401 struct moschip_port *mcs = from_timer(mcs, t, led_timer1);
402
403 /* Turn off LED */
404 mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
405 mod_timer(&mcs->led_timer2,
406 jiffies + msecs_to_jiffies(LED_OFF_MS));
407}
408
409static void mos7840_led_flag_off(struct timer_list *t)
410{
411 struct moschip_port *mcs = from_timer(mcs, t, led_timer2);
412
413 clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
414}
415
416static void mos7840_led_activity(struct usb_serial_port *port)
417{
418 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
419
420 if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
421 return;
422
423 mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
424 mod_timer(&mos7840_port->led_timer1,
425 jiffies + msecs_to_jiffies(LED_ON_MS));
426}
427
428/*****************************************************************************
429 * mos7840_bulk_in_callback
430 * this is the callback function for when we have received data on the
431 * bulk in endpoint.
432 *****************************************************************************/
433
434static void mos7840_bulk_in_callback(struct urb *urb)
435{
436 struct moschip_port *mos7840_port = urb->context;
437 struct usb_serial_port *port = mos7840_port->port;
438 int retval;
439 unsigned char *data;
440 int status = urb->status;
441
442 if (status) {
443 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
444 mos7840_port->read_urb_busy = false;
445 return;
446 }
447
448 data = urb->transfer_buffer;
449 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
450
451 if (urb->actual_length) {
452 struct tty_port *tport = &mos7840_port->port->port;
453 tty_insert_flip_string(tport, data, urb->actual_length);
454 tty_flip_buffer_push(tport);
455 port->icount.rx += urb->actual_length;
456 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
457 }
458
459 if (mos7840_port->has_led)
460 mos7840_led_activity(port);
461
462 mos7840_port->read_urb_busy = true;
463 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
464
465 if (retval) {
466 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
467 mos7840_port->read_urb_busy = false;
468 }
469}
470
471/*****************************************************************************
472 * mos7840_bulk_out_data_callback
473 * this is the callback function for when we have finished sending
474 * serial data on the bulk out endpoint.
475 *****************************************************************************/
476
477static void mos7840_bulk_out_data_callback(struct urb *urb)
478{
479 struct moschip_port *mos7840_port = urb->context;
480 struct usb_serial_port *port = mos7840_port->port;
481 int status = urb->status;
482 unsigned long flags;
483 int i;
484
485 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
486 for (i = 0; i < NUM_URBS; i++) {
487 if (urb == mos7840_port->write_urb_pool[i]) {
488 mos7840_port->busy[i] = 0;
489 break;
490 }
491 }
492 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
493
494 if (status) {
495 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
496 return;
497 }
498
499 tty_port_tty_wakeup(&port->port);
500
501}
502
503/************************************************************************/
504/* 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 */
505/************************************************************************/
506
507/*****************************************************************************
508 * mos7840_open
509 * this function is called by the tty driver when a port is opened
510 * If successful, we return 0
511 * Otherwise we return a negative error number.
512 *****************************************************************************/
513
514static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
515{
516 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
517 struct usb_serial *serial = port->serial;
518 int response;
519 int j;
520 struct urb *urb;
521 __u16 Data;
522 int status;
523
524 usb_clear_halt(serial->dev, port->write_urb->pipe);
525 usb_clear_halt(serial->dev, port->read_urb->pipe);
526
527 /* Initialising the write urb pool */
528 for (j = 0; j < NUM_URBS; ++j) {
529 urb = usb_alloc_urb(0, GFP_KERNEL);
530 mos7840_port->write_urb_pool[j] = urb;
531 if (!urb)
532 continue;
533
534 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
535 GFP_KERNEL);
536 if (!urb->transfer_buffer) {
537 usb_free_urb(urb);
538 mos7840_port->write_urb_pool[j] = NULL;
539 continue;
540 }
541 }
542
543/*****************************************************************************
544 * Initialize MCS7840 -- Write Init values to corresponding Registers
545 *
546 * Register Index
547 * 1 : IER
548 * 2 : FCR
549 * 3 : LCR
550 * 4 : MCR
551 *
552 * 0x08 : SP1/2 Control Reg
553 *****************************************************************************/
554
555 /* NEED to check the following Block */
556
557 Data = 0x0;
558 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
559 if (status < 0) {
560 dev_dbg(&port->dev, "Reading Spreg failed\n");
561 goto err;
562 }
563 Data |= 0x80;
564 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
565 if (status < 0) {
566 dev_dbg(&port->dev, "writing Spreg failed\n");
567 goto err;
568 }
569
570 Data &= ~0x80;
571 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
572 if (status < 0) {
573 dev_dbg(&port->dev, "writing Spreg failed\n");
574 goto err;
575 }
576 /* End of block to be checked */
577
578 Data = 0x0;
579 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
580 &Data);
581 if (status < 0) {
582 dev_dbg(&port->dev, "Reading Controlreg failed\n");
583 goto err;
584 }
585 Data |= 0x08; /* Driver done bit */
586 Data |= 0x20; /* rx_disable */
587 status = mos7840_set_reg_sync(port,
588 mos7840_port->ControlRegOffset, Data);
589 if (status < 0) {
590 dev_dbg(&port->dev, "writing Controlreg failed\n");
591 goto err;
592 }
593 /* do register settings here */
594 /* Set all regs to the device default values. */
595 /***********************************
596 * First Disable all interrupts.
597 ***********************************/
598 Data = 0x00;
599 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
600 if (status < 0) {
601 dev_dbg(&port->dev, "disabling interrupts failed\n");
602 goto err;
603 }
604 /* Set FIFO_CONTROL_REGISTER to the default value */
605 Data = 0x00;
606 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
607 if (status < 0) {
608 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
609 goto err;
610 }
611
612 Data = 0xcf;
613 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
614 if (status < 0) {
615 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
616 goto err;
617 }
618
619 Data = 0x03;
620 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
621 mos7840_port->shadowLCR = Data;
622
623 Data = 0x0b;
624 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
625 mos7840_port->shadowMCR = Data;
626
627 Data = 0x00;
628 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
629 mos7840_port->shadowLCR = Data;
630
631 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
632 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
633
634 Data = 0x0c;
635 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
636
637 Data = 0x0;
638 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
639
640 Data = 0x00;
641 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
642
643 Data = Data & ~SERIAL_LCR_DLAB;
644 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
645 mos7840_port->shadowLCR = Data;
646
647 /* clearing Bulkin and Bulkout Fifo */
648 Data = 0x0;
649 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
650
651 Data = Data | 0x0c;
652 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
653
654 Data = Data & ~0x0c;
655 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
656 /* Finally enable all interrupts */
657 Data = 0x0c;
658 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
659
660 /* clearing rx_disable */
661 Data = 0x0;
662 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
663 &Data);
664 Data = Data & ~0x20;
665 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
666 Data);
667
668 /* rx_negate */
669 Data = 0x0;
670 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
671 &Data);
672 Data = Data | 0x10;
673 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
674 Data);
675
676 dev_dbg(&port->dev, "port number is %d\n", port->port_number);
677 dev_dbg(&port->dev, "minor number is %d\n", port->minor);
678 dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
679 dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
680 dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
681 dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
682 mos7840_port->read_urb = port->read_urb;
683
684 /* set up our bulk in urb */
685 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
686 usb_fill_bulk_urb(mos7840_port->read_urb,
687 serial->dev,
688 usb_rcvbulkpipe(serial->dev,
689 (port->bulk_in_endpointAddress) + 2),
690 port->bulk_in_buffer,
691 mos7840_port->read_urb->transfer_buffer_length,
692 mos7840_bulk_in_callback, mos7840_port);
693 } else {
694 usb_fill_bulk_urb(mos7840_port->read_urb,
695 serial->dev,
696 usb_rcvbulkpipe(serial->dev,
697 port->bulk_in_endpointAddress),
698 port->bulk_in_buffer,
699 mos7840_port->read_urb->transfer_buffer_length,
700 mos7840_bulk_in_callback, mos7840_port);
701 }
702
703 dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
704 mos7840_port->read_urb_busy = true;
705 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
706 if (response) {
707 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
708 __func__, response);
709 mos7840_port->read_urb_busy = false;
710 }
711
712 /* initialize our port settings */
713 /* Must set to enable ints! */
714 mos7840_port->shadowMCR = MCR_MASTER_IE;
715
716 return 0;
717err:
718 for (j = 0; j < NUM_URBS; ++j) {
719 urb = mos7840_port->write_urb_pool[j];
720 if (!urb)
721 continue;
722 kfree(urb->transfer_buffer);
723 usb_free_urb(urb);
724 }
725 return status;
726}
727
728/*****************************************************************************
729 * mos7840_chars_in_buffer
730 * this function is called by the tty driver when it wants to know how many
731 * bytes of data we currently have outstanding in the port (data that has
732 * been written, but hasn't made it out the port yet)
733 * If successful, we return the number of bytes left to be written in the
734 * system,
735 * Otherwise we return zero.
736 *****************************************************************************/
737
738static int mos7840_chars_in_buffer(struct tty_struct *tty)
739{
740 struct usb_serial_port *port = tty->driver_data;
741 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
742 int i;
743 int chars = 0;
744 unsigned long flags;
745
746 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
747 for (i = 0; i < NUM_URBS; ++i) {
748 if (mos7840_port->busy[i]) {
749 struct urb *urb = mos7840_port->write_urb_pool[i];
750 chars += urb->transfer_buffer_length;
751 }
752 }
753 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
754 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
755 return chars;
756
757}
758
759/*****************************************************************************
760 * mos7840_close
761 * this function is called by the tty driver when a port is closed
762 *****************************************************************************/
763
764static void mos7840_close(struct usb_serial_port *port)
765{
766 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
767 int j;
768 __u16 Data;
769
770 for (j = 0; j < NUM_URBS; ++j)
771 usb_kill_urb(mos7840_port->write_urb_pool[j]);
772
773 /* Freeing Write URBs */
774 for (j = 0; j < NUM_URBS; ++j) {
775 if (mos7840_port->write_urb_pool[j]) {
776 kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
777 usb_free_urb(mos7840_port->write_urb_pool[j]);
778 }
779 }
780
781 usb_kill_urb(mos7840_port->read_urb);
782 mos7840_port->read_urb_busy = false;
783
784 Data = 0x0;
785 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
786
787 Data = 0x00;
788 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
789}
790
791/*****************************************************************************
792 * mos7840_break
793 * this function sends a break to the port
794 *****************************************************************************/
795static void mos7840_break(struct tty_struct *tty, int break_state)
796{
797 struct usb_serial_port *port = tty->driver_data;
798 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
799 unsigned char data;
800
801 if (break_state == -1)
802 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
803 else
804 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
805
806 /* FIXME: no locking on shadowLCR anywhere in driver */
807 mos7840_port->shadowLCR = data;
808 dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
809 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
810 mos7840_port->shadowLCR);
811}
812
813/*****************************************************************************
814 * mos7840_write_room
815 * this function is called by the tty driver when it wants to know how many
816 * bytes of data we can accept for a specific port.
817 * If successful, we return the amount of room that we have for this port
818 * Otherwise we return a negative error number.
819 *****************************************************************************/
820
821static int mos7840_write_room(struct tty_struct *tty)
822{
823 struct usb_serial_port *port = tty->driver_data;
824 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
825 int i;
826 int room = 0;
827 unsigned long flags;
828
829 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
830 for (i = 0; i < NUM_URBS; ++i) {
831 if (!mos7840_port->busy[i])
832 room += URB_TRANSFER_BUFFER_SIZE;
833 }
834 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
835
836 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
837 dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
838 return room;
839
840}
841
842/*****************************************************************************
843 * mos7840_write
844 * this function is called by the tty driver when data should be written to
845 * the port.
846 * If successful, we return the number of bytes written, otherwise we
847 * return a negative error number.
848 *****************************************************************************/
849
850static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
851 const unsigned char *data, int count)
852{
853 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
854 struct usb_serial *serial = port->serial;
855 int status;
856 int i;
857 int bytes_sent = 0;
858 int transfer_size;
859 unsigned long flags;
860 struct urb *urb;
861 /* __u16 Data; */
862 const unsigned char *current_position = data;
863
864 /* try to find a free urb in the list */
865 urb = NULL;
866
867 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
868 for (i = 0; i < NUM_URBS; ++i) {
869 if (!mos7840_port->busy[i]) {
870 mos7840_port->busy[i] = 1;
871 urb = mos7840_port->write_urb_pool[i];
872 dev_dbg(&port->dev, "URB:%d\n", i);
873 break;
874 }
875 }
876 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
877
878 if (urb == NULL) {
879 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
880 goto exit;
881 }
882
883 if (urb->transfer_buffer == NULL) {
884 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
885 GFP_ATOMIC);
886 if (!urb->transfer_buffer)
887 goto exit;
888 }
889 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
890
891 memcpy(urb->transfer_buffer, current_position, transfer_size);
892
893 /* fill urb with data and submit */
894 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
895 usb_fill_bulk_urb(urb,
896 serial->dev,
897 usb_sndbulkpipe(serial->dev,
898 (port->bulk_out_endpointAddress) + 2),
899 urb->transfer_buffer,
900 transfer_size,
901 mos7840_bulk_out_data_callback, mos7840_port);
902 } else {
903 usb_fill_bulk_urb(urb,
904 serial->dev,
905 usb_sndbulkpipe(serial->dev,
906 port->bulk_out_endpointAddress),
907 urb->transfer_buffer,
908 transfer_size,
909 mos7840_bulk_out_data_callback, mos7840_port);
910 }
911
912 dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
913
914 if (mos7840_port->has_led)
915 mos7840_led_activity(port);
916
917 /* send it down the pipe */
918 status = usb_submit_urb(urb, GFP_ATOMIC);
919
920 if (status) {
921 mos7840_port->busy[i] = 0;
922 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
923 "with status = %d\n", __func__, status);
924 bytes_sent = status;
925 goto exit;
926 }
927 bytes_sent = transfer_size;
928 port->icount.tx += transfer_size;
929 dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
930exit:
931 return bytes_sent;
932
933}
934
935/*****************************************************************************
936 * mos7840_throttle
937 * this function is called by the tty driver when it wants to stop the data
938 * being read from the port.
939 *****************************************************************************/
940
941static void mos7840_throttle(struct tty_struct *tty)
942{
943 struct usb_serial_port *port = tty->driver_data;
944 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
945 int status;
946
947 /* if we are implementing XON/XOFF, send the stop character */
948 if (I_IXOFF(tty)) {
949 unsigned char stop_char = STOP_CHAR(tty);
950 status = mos7840_write(tty, port, &stop_char, 1);
951 if (status <= 0)
952 return;
953 }
954 /* if we are implementing RTS/CTS, toggle that line */
955 if (C_CRTSCTS(tty)) {
956 mos7840_port->shadowMCR &= ~MCR_RTS;
957 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
958 mos7840_port->shadowMCR);
959 if (status < 0)
960 return;
961 }
962}
963
964/*****************************************************************************
965 * mos7840_unthrottle
966 * this function is called by the tty driver when it wants to resume
967 * the data being read from the port (called after mos7840_throttle is
968 * called)
969 *****************************************************************************/
970static void mos7840_unthrottle(struct tty_struct *tty)
971{
972 struct usb_serial_port *port = tty->driver_data;
973 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
974 int status;
975
976 /* if we are implementing XON/XOFF, send the start character */
977 if (I_IXOFF(tty)) {
978 unsigned char start_char = START_CHAR(tty);
979 status = mos7840_write(tty, port, &start_char, 1);
980 if (status <= 0)
981 return;
982 }
983
984 /* if we are implementing RTS/CTS, toggle that line */
985 if (C_CRTSCTS(tty)) {
986 mos7840_port->shadowMCR |= MCR_RTS;
987 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
988 mos7840_port->shadowMCR);
989 if (status < 0)
990 return;
991 }
992}
993
994static int mos7840_tiocmget(struct tty_struct *tty)
995{
996 struct usb_serial_port *port = tty->driver_data;
997 unsigned int result;
998 __u16 msr;
999 __u16 mcr;
1000 int status;
1001
1002 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1003 if (status < 0)
1004 return -EIO;
1005 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1006 if (status < 0)
1007 return -EIO;
1008 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1009 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1010 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1011 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1012 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1013 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1014 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1015
1016 dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1017
1018 return result;
1019}
1020
1021static int mos7840_tiocmset(struct tty_struct *tty,
1022 unsigned int set, unsigned int clear)
1023{
1024 struct usb_serial_port *port = tty->driver_data;
1025 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
1026 unsigned int mcr;
1027 int status;
1028
1029 /* FIXME: What locks the port registers ? */
1030 mcr = mos7840_port->shadowMCR;
1031 if (clear & TIOCM_RTS)
1032 mcr &= ~MCR_RTS;
1033 if (clear & TIOCM_DTR)
1034 mcr &= ~MCR_DTR;
1035 if (clear & TIOCM_LOOP)
1036 mcr &= ~MCR_LOOPBACK;
1037
1038 if (set & TIOCM_RTS)
1039 mcr |= MCR_RTS;
1040 if (set & TIOCM_DTR)
1041 mcr |= MCR_DTR;
1042 if (set & TIOCM_LOOP)
1043 mcr |= MCR_LOOPBACK;
1044
1045 mos7840_port->shadowMCR = mcr;
1046
1047 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1048 if (status < 0) {
1049 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1050 return status;
1051 }
1052
1053 return 0;
1054}
1055
1056/*****************************************************************************
1057 * mos7840_calc_baud_rate_divisor
1058 * this function calculates the proper baud rate divisor for the specified
1059 * baud rate.
1060 *****************************************************************************/
1061static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1062 int baudRate, int *divisor,
1063 __u16 *clk_sel_val)
1064{
1065 dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1066
1067 if (baudRate <= 115200) {
1068 *divisor = 115200 / baudRate;
1069 *clk_sel_val = 0x0;
1070 }
1071 if ((baudRate > 115200) && (baudRate <= 230400)) {
1072 *divisor = 230400 / baudRate;
1073 *clk_sel_val = 0x10;
1074 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1075 *divisor = 403200 / baudRate;
1076 *clk_sel_val = 0x20;
1077 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1078 *divisor = 460800 / baudRate;
1079 *clk_sel_val = 0x30;
1080 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1081 *divisor = 806400 / baudRate;
1082 *clk_sel_val = 0x40;
1083 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1084 *divisor = 921600 / baudRate;
1085 *clk_sel_val = 0x50;
1086 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1087 *divisor = 1572864 / baudRate;
1088 *clk_sel_val = 0x60;
1089 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1090 *divisor = 3145728 / baudRate;
1091 *clk_sel_val = 0x70;
1092 }
1093 return 0;
1094}
1095
1096/*****************************************************************************
1097 * mos7840_send_cmd_write_baud_rate
1098 * this function sends the proper command to change the baud rate of the
1099 * specified port.
1100 *****************************************************************************/
1101
1102static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1103 int baudRate)
1104{
1105 struct usb_serial_port *port = mos7840_port->port;
1106 int divisor = 0;
1107 int status;
1108 __u16 Data;
1109 __u16 clk_sel_val;
1110
1111 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1112 /* reset clk_uart_sel in spregOffset */
1113 if (baudRate > 115200) {
1114#ifdef HW_flow_control
1115 /* NOTE: need to see the pther register to modify */
1116 /* setting h/w flow control bit to 1 */
1117 Data = 0x2b;
1118 mos7840_port->shadowMCR = Data;
1119 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1120 Data);
1121 if (status < 0) {
1122 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1123 return -1;
1124 }
1125#endif
1126
1127 } else {
1128#ifdef HW_flow_control
1129 /* setting h/w flow control bit to 0 */
1130 Data = 0xb;
1131 mos7840_port->shadowMCR = Data;
1132 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1133 Data);
1134 if (status < 0) {
1135 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1136 return -1;
1137 }
1138#endif
1139
1140 }
1141
1142 if (1) { /* baudRate <= 115200) */
1143 clk_sel_val = 0x0;
1144 Data = 0x0;
1145 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1146 &clk_sel_val);
1147 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1148 &Data);
1149 if (status < 0) {
1150 dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1151 return -1;
1152 }
1153 Data = (Data & 0x8f) | clk_sel_val;
1154 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1155 Data);
1156 if (status < 0) {
1157 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1158 return -1;
1159 }
1160 /* Calculate the Divisor */
1161
1162 if (status) {
1163 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1164 return status;
1165 }
1166 /* Enable access to divisor latch */
1167 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1168 mos7840_port->shadowLCR = Data;
1169 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1170
1171 /* Write the divisor */
1172 Data = (unsigned char)(divisor & 0xff);
1173 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1174 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1175
1176 Data = (unsigned char)((divisor & 0xff00) >> 8);
1177 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1178 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1179
1180 /* Disable access to divisor latch */
1181 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1182 mos7840_port->shadowLCR = Data;
1183 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1184
1185 }
1186 return status;
1187}
1188
1189/*****************************************************************************
1190 * mos7840_change_port_settings
1191 * This routine is called to set the UART on the device to match
1192 * the specified new settings.
1193 *****************************************************************************/
1194
1195static void mos7840_change_port_settings(struct tty_struct *tty,
1196 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1197{
1198 struct usb_serial_port *port = mos7840_port->port;
1199 int baud;
1200 unsigned cflag;
1201 __u8 lData;
1202 __u8 lParity;
1203 __u8 lStop;
1204 int status;
1205 __u16 Data;
1206
1207 lData = LCR_BITS_8;
1208 lStop = LCR_STOP_1;
1209 lParity = LCR_PAR_NONE;
1210
1211 cflag = tty->termios.c_cflag;
1212
1213 /* Change the number of bits */
1214 switch (cflag & CSIZE) {
1215 case CS5:
1216 lData = LCR_BITS_5;
1217 break;
1218
1219 case CS6:
1220 lData = LCR_BITS_6;
1221 break;
1222
1223 case CS7:
1224 lData = LCR_BITS_7;
1225 break;
1226
1227 default:
1228 case CS8:
1229 lData = LCR_BITS_8;
1230 break;
1231 }
1232
1233 /* Change the Parity bit */
1234 if (cflag & PARENB) {
1235 if (cflag & PARODD) {
1236 lParity = LCR_PAR_ODD;
1237 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1238 } else {
1239 lParity = LCR_PAR_EVEN;
1240 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1241 }
1242
1243 } else {
1244 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1245 }
1246
1247 if (cflag & CMSPAR)
1248 lParity = lParity | 0x20;
1249
1250 /* Change the Stop bit */
1251 if (cflag & CSTOPB) {
1252 lStop = LCR_STOP_2;
1253 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1254 } else {
1255 lStop = LCR_STOP_1;
1256 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1257 }
1258
1259 /* Update the LCR with the correct value */
1260 mos7840_port->shadowLCR &=
1261 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1262 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1263
1264 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1265 mos7840_port->shadowLCR);
1266 /* Disable Interrupts */
1267 Data = 0x00;
1268 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1269
1270 Data = 0x00;
1271 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1272
1273 Data = 0xcf;
1274 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1275
1276 /* Send the updated LCR value to the mos7840 */
1277 Data = mos7840_port->shadowLCR;
1278
1279 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1280
1281 Data = 0x00b;
1282 mos7840_port->shadowMCR = Data;
1283 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1284 Data = 0x00b;
1285 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1286
1287 /* set up the MCR register and send it to the mos7840 */
1288
1289 mos7840_port->shadowMCR = MCR_MASTER_IE;
1290 if (cflag & CBAUD)
1291 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1292
1293 if (cflag & CRTSCTS)
1294 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1295 else
1296 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1297
1298 Data = mos7840_port->shadowMCR;
1299 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1300
1301 /* Determine divisor based on baud rate */
1302 baud = tty_get_baud_rate(tty);
1303
1304 if (!baud) {
1305 /* pick a default, any default... */
1306 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1307 baud = 9600;
1308 }
1309
1310 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1311 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1312
1313 /* Enable Interrupts */
1314 Data = 0x0c;
1315 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1316
1317 if (!mos7840_port->read_urb_busy) {
1318 mos7840_port->read_urb_busy = true;
1319 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1320 if (status) {
1321 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1322 status);
1323 mos7840_port->read_urb_busy = false;
1324 }
1325 }
1326 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1327 mos7840_port->shadowLCR);
1328}
1329
1330/*****************************************************************************
1331 * mos7840_set_termios
1332 * this function is called by the tty driver when it wants to change
1333 * the termios structure
1334 *****************************************************************************/
1335
1336static void mos7840_set_termios(struct tty_struct *tty,
1337 struct usb_serial_port *port,
1338 struct ktermios *old_termios)
1339{
1340 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
1341 int status;
1342
1343 /* change the port settings to the new ones specified */
1344
1345 mos7840_change_port_settings(tty, mos7840_port, old_termios);
1346
1347 if (!mos7840_port->read_urb_busy) {
1348 mos7840_port->read_urb_busy = true;
1349 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1350 if (status) {
1351 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1352 status);
1353 mos7840_port->read_urb_busy = false;
1354 }
1355 }
1356}
1357
1358/*****************************************************************************
1359 * mos7840_get_lsr_info - get line status register info
1360 *
1361 * Purpose: Let user call ioctl() to get info when the UART physically
1362 * is emptied. On bus types like RS485, the transmitter must
1363 * release the bus after transmitting. This must be done when
1364 * the transmit shift register is empty, not be done when the
1365 * transmit holding register is empty. This functionality
1366 * allows an RS485 driver to be written in user space.
1367 *****************************************************************************/
1368
1369static int mos7840_get_lsr_info(struct tty_struct *tty,
1370 unsigned int __user *value)
1371{
1372 int count;
1373 unsigned int result = 0;
1374
1375 count = mos7840_chars_in_buffer(tty);
1376 if (count == 0)
1377 result = TIOCSER_TEMT;
1378
1379 if (copy_to_user(value, &result, sizeof(int)))
1380 return -EFAULT;
1381 return 0;
1382}
1383
1384/*****************************************************************************
1385 * mos7840_get_serial_info
1386 * function to get information about serial port
1387 *****************************************************************************/
1388
1389static int mos7840_get_serial_info(struct tty_struct *tty,
1390 struct serial_struct *ss)
1391{
1392 struct usb_serial_port *port = tty->driver_data;
1393 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
1394
1395 ss->type = PORT_16550A;
1396 ss->line = mos7840_port->port->minor;
1397 ss->port = mos7840_port->port->port_number;
1398 ss->irq = 0;
1399 ss->xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
1400 ss->baud_base = 9600;
1401 ss->close_delay = 5 * HZ;
1402 ss->closing_wait = 30 * HZ;
1403 return 0;
1404}
1405
1406/*****************************************************************************
1407 * SerialIoctl
1408 * this function handles any ioctl calls to the driver
1409 *****************************************************************************/
1410
1411static int mos7840_ioctl(struct tty_struct *tty,
1412 unsigned int cmd, unsigned long arg)
1413{
1414 struct usb_serial_port *port = tty->driver_data;
1415 void __user *argp = (void __user *)arg;
1416
1417 switch (cmd) {
1418 /* return number of bytes available */
1419
1420 case TIOCSERGETLSR:
1421 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1422 return mos7840_get_lsr_info(tty, argp);
1423
1424 default:
1425 break;
1426 }
1427 return -ENOIOCTLCMD;
1428}
1429
1430/*
1431 * Check if GPO (pin 42) is connected to GPI (pin 33) as recommended by ASIX
1432 * for MCS7810 by bit-banging a 16-bit word.
1433 *
1434 * Note that GPO is really RTS of the third port so this will toggle RTS of
1435 * port two or three on two- and four-port devices.
1436 */
1437static int mos7810_check(struct usb_serial *serial)
1438{
1439 int i, pass_count = 0;
1440 u8 *buf;
1441 __u16 data = 0, mcr_data = 0;
1442 __u16 test_pattern = 0x55AA;
1443 int res;
1444
1445 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
1446 if (!buf)
1447 return 0; /* failed to identify 7810 */
1448
1449 /* Store MCR setting */
1450 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1451 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
1452 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1453 if (res == VENDOR_READ_LENGTH)
1454 mcr_data = *buf;
1455
1456 for (i = 0; i < 16; i++) {
1457 /* Send the 1-bit test pattern out to MCS7810 test pin */
1458 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1459 MCS_WRREQ, MCS_WR_RTYPE,
1460 (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
1461 MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
1462
1463 /* Read the test pattern back */
1464 res = usb_control_msg(serial->dev,
1465 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
1466 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
1467 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1468 if (res == VENDOR_READ_LENGTH)
1469 data = *buf;
1470
1471 /* If this is a MCS7810 device, both test patterns must match */
1472 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
1473 break;
1474
1475 pass_count++;
1476 }
1477
1478 /* Restore MCR setting */
1479 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
1480 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
1481 0, MOS_WDR_TIMEOUT);
1482
1483 kfree(buf);
1484
1485 if (pass_count == 16)
1486 return 1;
1487
1488 return 0;
1489}
1490
1491static int mos7840_probe(struct usb_serial *serial,
1492 const struct usb_device_id *id)
1493{
1494 unsigned long device_flags = id->driver_info;
1495 u8 *buf;
1496
1497 /* Skip device-type detection if we already have device flags. */
1498 if (device_flags)
1499 goto out;
1500
1501 buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
1502 if (!buf)
1503 return -ENOMEM;
1504
1505 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1506 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
1507 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1508
1509 /* For a MCS7840 device GPIO0 must be set to 1 */
1510 if (buf[0] & 0x01)
1511 device_flags = MCS_PORTS(4);
1512 else if (mos7810_check(serial))
1513 device_flags = MCS_PORTS(1) | MCS_LED;
1514 else
1515 device_flags = MCS_PORTS(2);
1516
1517 kfree(buf);
1518out:
1519 usb_set_serial_data(serial, (void *)device_flags);
1520
1521 return 0;
1522}
1523
1524static int mos7840_calc_num_ports(struct usb_serial *serial,
1525 struct usb_serial_endpoints *epds)
1526{
1527 unsigned long device_flags = (unsigned long)usb_get_serial_data(serial);
1528 int num_ports = MCS_PORTS(device_flags);
1529
1530 if (num_ports == 0 || num_ports > 4)
1531 return -ENODEV;
1532
1533 if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) {
1534 dev_err(&serial->interface->dev, "missing endpoints\n");
1535 return -ENODEV;
1536 }
1537
1538 return num_ports;
1539}
1540
1541static int mos7840_attach(struct usb_serial *serial)
1542{
1543 struct device *dev = &serial->interface->dev;
1544 int status;
1545 u16 val;
1546
1547 /* Zero Length flag enable */
1548 val = 0x0f;
1549 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, val);
1550 if (status < 0)
1551 dev_dbg(dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
1552 else
1553 dev_dbg(dev, "ZLP_REG5 Writing success status%d\n", status);
1554
1555 return status;
1556}
1557
1558static int mos7840_port_probe(struct usb_serial_port *port)
1559{
1560 struct usb_serial *serial = port->serial;
1561 unsigned long device_flags = (unsigned long)usb_get_serial_data(serial);
1562 struct moschip_port *mos7840_port;
1563 int status;
1564 int pnum;
1565 __u16 Data;
1566
1567 /* we set up the pointers to the endpoints in the mos7840_open *
1568 * function, as the structures aren't created yet. */
1569
1570 pnum = port->port_number;
1571
1572 dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
1573 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
1574 if (!mos7840_port)
1575 return -ENOMEM;
1576
1577 /* Initialize all port interrupt end point to port 0 int
1578 * endpoint. Our device has only one interrupt end point
1579 * common to all port */
1580
1581 mos7840_port->port = port;
1582 spin_lock_init(&mos7840_port->pool_lock);
1583
1584 /* minor is not initialised until later by
1585 * usb-serial.c:get_free_serial() and cannot therefore be used
1586 * to index device instances */
1587 mos7840_port->port_num = pnum + 1;
1588 dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
1589 dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
1590
1591 if (mos7840_port->port_num == 1) {
1592 mos7840_port->SpRegOffset = 0x0;
1593 mos7840_port->ControlRegOffset = 0x1;
1594 mos7840_port->DcrRegOffset = 0x4;
1595 } else {
1596 u8 phy_num = mos7840_port->port_num;
1597
1598 /* Port 2 in the 2-port case uses registers of port 3 */
1599 if (serial->num_ports == 2)
1600 phy_num = 3;
1601
1602 mos7840_port->SpRegOffset = 0x8 + 2 * (phy_num - 2);
1603 mos7840_port->ControlRegOffset = 0x9 + 2 * (phy_num - 2);
1604 mos7840_port->DcrRegOffset = 0x16 + 3 * (phy_num - 2);
1605 }
1606 mos7840_dump_serial_port(port, mos7840_port);
1607 usb_set_serial_port_data(port, mos7840_port);
1608
1609 /* enable rx_disable bit in control register */
1610 status = mos7840_get_reg_sync(port,
1611 mos7840_port->ControlRegOffset, &Data);
1612 if (status < 0) {
1613 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
1614 goto error;
1615 } else
1616 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
1617 Data |= 0x08; /* setting driver done bit */
1618 Data |= 0x04; /* sp1_bit to have cts change reflect in
1619 modem status reg */
1620
1621 /* Data |= 0x20; //rx_disable bit */
1622 status = mos7840_set_reg_sync(port,
1623 mos7840_port->ControlRegOffset, Data);
1624 if (status < 0) {
1625 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
1626 goto error;
1627 } else
1628 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
1629
1630 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
1631 and 0x24 in DCR3 */
1632 Data = 0x01;
1633 status = mos7840_set_reg_sync(port,
1634 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
1635 if (status < 0) {
1636 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
1637 goto error;
1638 } else
1639 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
1640
1641 Data = 0x05;
1642 status = mos7840_set_reg_sync(port,
1643 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
1644 if (status < 0) {
1645 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
1646 goto error;
1647 } else
1648 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
1649
1650 Data = 0x24;
1651 status = mos7840_set_reg_sync(port,
1652 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
1653 if (status < 0) {
1654 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
1655 goto error;
1656 } else
1657 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
1658
1659 /* write values in clkstart0x0 and clkmulti 0x20 */
1660 Data = 0x0;
1661 status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
1662 if (status < 0) {
1663 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
1664 goto error;
1665 } else
1666 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
1667
1668 Data = 0x20;
1669 status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
1670 if (status < 0) {
1671 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
1672 goto error;
1673 } else
1674 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
1675
1676 /* write value 0x0 to scratchpad register */
1677 Data = 0x00;
1678 status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
1679 if (status < 0) {
1680 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
1681 goto error;
1682 } else
1683 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
1684
1685 /* Zero Length flag register */
1686 if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
1687 Data = 0xff;
1688 status = mos7840_set_reg_sync(port,
1689 (__u16) (ZLP_REG1 +
1690 ((__u16)mos7840_port->port_num)), Data);
1691 dev_dbg(&port->dev, "ZLIP offset %x\n",
1692 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
1693 if (status < 0) {
1694 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
1695 goto error;
1696 } else
1697 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
1698 } else {
1699 Data = 0xff;
1700 status = mos7840_set_reg_sync(port,
1701 (__u16) (ZLP_REG1 +
1702 ((__u16)mos7840_port->port_num) - 0x1), Data);
1703 dev_dbg(&port->dev, "ZLIP offset %x\n",
1704 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
1705 if (status < 0) {
1706 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
1707 goto error;
1708 } else
1709 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
1710
1711 }
1712
1713 mos7840_port->has_led = device_flags & MCS_LED;
1714
1715 /* Initialize LED timers */
1716 if (mos7840_port->has_led) {
1717 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
1718 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
1719 GFP_KERNEL);
1720 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
1721 status = -ENOMEM;
1722 goto error;
1723 }
1724
1725 timer_setup(&mos7840_port->led_timer1, mos7840_led_off, 0);
1726 mos7840_port->led_timer1.expires =
1727 jiffies + msecs_to_jiffies(LED_ON_MS);
1728 timer_setup(&mos7840_port->led_timer2, mos7840_led_flag_off,
1729 0);
1730 mos7840_port->led_timer2.expires =
1731 jiffies + msecs_to_jiffies(LED_OFF_MS);
1732
1733 /* Turn off LED */
1734 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
1735 }
1736
1737 return 0;
1738error:
1739 kfree(mos7840_port->led_dr);
1740 usb_free_urb(mos7840_port->led_urb);
1741 kfree(mos7840_port);
1742
1743 return status;
1744}
1745
1746static int mos7840_port_remove(struct usb_serial_port *port)
1747{
1748 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
1749
1750 if (mos7840_port->has_led) {
1751 /* Turn off LED */
1752 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
1753
1754 del_timer_sync(&mos7840_port->led_timer1);
1755 del_timer_sync(&mos7840_port->led_timer2);
1756
1757 usb_kill_urb(mos7840_port->led_urb);
1758 usb_free_urb(mos7840_port->led_urb);
1759 kfree(mos7840_port->led_dr);
1760 }
1761
1762 kfree(mos7840_port);
1763
1764 return 0;
1765}
1766
1767static struct usb_serial_driver moschip7840_4port_device = {
1768 .driver = {
1769 .owner = THIS_MODULE,
1770 .name = "mos7840",
1771 },
1772 .description = DRIVER_DESC,
1773 .id_table = id_table,
1774 .num_interrupt_in = 1,
1775 .open = mos7840_open,
1776 .close = mos7840_close,
1777 .write = mos7840_write,
1778 .write_room = mos7840_write_room,
1779 .chars_in_buffer = mos7840_chars_in_buffer,
1780 .throttle = mos7840_throttle,
1781 .unthrottle = mos7840_unthrottle,
1782 .calc_num_ports = mos7840_calc_num_ports,
1783 .probe = mos7840_probe,
1784 .attach = mos7840_attach,
1785 .ioctl = mos7840_ioctl,
1786 .get_serial = mos7840_get_serial_info,
1787 .set_termios = mos7840_set_termios,
1788 .break_ctl = mos7840_break,
1789 .tiocmget = mos7840_tiocmget,
1790 .tiocmset = mos7840_tiocmset,
1791 .get_icount = usb_serial_generic_get_icount,
1792 .port_probe = mos7840_port_probe,
1793 .port_remove = mos7840_port_remove,
1794 .read_bulk_callback = mos7840_bulk_in_callback,
1795};
1796
1797static struct usb_serial_driver * const serial_drivers[] = {
1798 &moschip7840_4port_device, NULL
1799};
1800
1801module_usb_serial_driver(serial_drivers, id_table);
1802
1803MODULE_DESCRIPTION(DRIVER_DESC);
1804MODULE_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/* The native component can have its vendor/device id's overridden
118 * in vendor-specific implementations. Such devices can be handled
119 * by making a change here, in moschip_port_id_table, and in
120 * moschip_id_table_combined
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
178#define SERIAL_LCR_DLAB ((__u16)(0x0080))
179
180/*
181 * URB POOL related defines
182 */
183#define NUM_URBS 16 /* URB Count */
184#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
185
186
187static const struct usb_device_id moschip_port_id_table[] = {
188 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
189 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
190 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
191 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
192 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
193 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
194 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
195 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
196 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
197 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
198 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
199 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
200 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
201 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
202 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
203 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
204 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
205 {} /* terminating entry */
206};
207
208static const struct usb_device_id moschip_id_table_combined[] __devinitconst = {
209 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
210 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
211 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
212 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
213 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
214 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
215 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
216 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
217 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
218 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
219 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
220 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
221 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
222 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
223 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
224 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
225 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
226 {} /* terminating entry */
227};
228
229MODULE_DEVICE_TABLE(usb, moschip_id_table_combined);
230
231/* This structure holds all of the local port information */
232
233struct moschip_port {
234 int port_num; /*Actual port number in the device(1,2,etc) */
235 struct urb *write_urb; /* write URB for this port */
236 struct urb *read_urb; /* read URB for this port */
237 struct urb *int_urb;
238 __u8 shadowLCR; /* last LCR value received */
239 __u8 shadowMCR; /* last MCR value received */
240 char open;
241 char open_ports;
242 char zombie;
243 wait_queue_head_t wait_chase; /* for handling sleeping while waiting for chase to finish */
244 wait_queue_head_t delta_msr_wait; /* for handling sleeping while waiting for msr change to happen */
245 int delta_msr_cond;
246 struct async_icount icount;
247 struct usb_serial_port *port; /* loop back to the owner of this object */
248
249 /* Offsets */
250 __u8 SpRegOffset;
251 __u8 ControlRegOffset;
252 __u8 DcrRegOffset;
253 /* for processing control URBS in interrupt context */
254 struct urb *control_urb;
255 struct usb_ctrlrequest *dr;
256 char *ctrl_buf;
257 int MsrLsr;
258
259 spinlock_t pool_lock;
260 struct urb *write_urb_pool[NUM_URBS];
261 char busy[NUM_URBS];
262 bool read_urb_busy;
263};
264
265
266static int debug;
267
268/*
269 * mos7840_set_reg_sync
270 * To set the Control register by calling usb_fill_control_urb function
271 * by passing usb_sndctrlpipe function as parameter.
272 */
273
274static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
275 __u16 val)
276{
277 struct usb_device *dev = port->serial->dev;
278 val = val & 0x00ff;
279 dbg("mos7840_set_reg_sync offset is %x, value %x", reg, val);
280
281 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
282 MCS_WR_RTYPE, val, reg, NULL, 0,
283 MOS_WDR_TIMEOUT);
284}
285
286/*
287 * mos7840_get_reg_sync
288 * To set the Uart register by calling usb_fill_control_urb function by
289 * passing usb_rcvctrlpipe function as parameter.
290 */
291
292static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
293 __u16 *val)
294{
295 struct usb_device *dev = port->serial->dev;
296 int ret = 0;
297 u8 *buf;
298
299 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
300 if (!buf)
301 return -ENOMEM;
302
303 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
304 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
305 MOS_WDR_TIMEOUT);
306 *val = buf[0];
307 dbg("mos7840_get_reg_sync offset is %x, return val %x", reg, *val);
308
309 kfree(buf);
310 return ret;
311}
312
313/*
314 * mos7840_set_uart_reg
315 * To set the Uart register by calling usb_fill_control_urb function by
316 * passing usb_sndctrlpipe function as parameter.
317 */
318
319static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
320 __u16 val)
321{
322
323 struct usb_device *dev = port->serial->dev;
324 val = val & 0x00ff;
325 /* For the UART control registers, the application number need
326 to be Or'ed */
327 if (port->serial->num_ports == 4) {
328 val |= (((__u16) port->number -
329 (__u16) (port->serial->minor)) + 1) << 8;
330 dbg("mos7840_set_uart_reg application number is %x", val);
331 } else {
332 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
333 val |= (((__u16) port->number -
334 (__u16) (port->serial->minor)) + 1) << 8;
335 dbg("mos7840_set_uart_reg application number is %x",
336 val);
337 } else {
338 val |=
339 (((__u16) port->number -
340 (__u16) (port->serial->minor)) + 2) << 8;
341 dbg("mos7840_set_uart_reg application number is %x",
342 val);
343 }
344 }
345 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
346 MCS_WR_RTYPE, val, reg, NULL, 0,
347 MOS_WDR_TIMEOUT);
348
349}
350
351/*
352 * mos7840_get_uart_reg
353 * To set the Control register by calling usb_fill_control_urb function
354 * by passing usb_rcvctrlpipe function as parameter.
355 */
356static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
357 __u16 *val)
358{
359 struct usb_device *dev = port->serial->dev;
360 int ret = 0;
361 __u16 Wval;
362 u8 *buf;
363
364 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
365 if (!buf)
366 return -ENOMEM;
367
368 /* dbg("application number is %4x",
369 (((__u16)port->number - (__u16)(port->serial->minor))+1)<<8); */
370 /* Wval is same as application number */
371 if (port->serial->num_ports == 4) {
372 Wval =
373 (((__u16) port->number - (__u16) (port->serial->minor)) +
374 1) << 8;
375 dbg("mos7840_get_uart_reg application number is %x", Wval);
376 } else {
377 if (((__u16) port->number - (__u16) (port->serial->minor)) == 0) {
378 Wval = (((__u16) port->number -
379 (__u16) (port->serial->minor)) + 1) << 8;
380 dbg("mos7840_get_uart_reg application number is %x",
381 Wval);
382 } else {
383 Wval = (((__u16) port->number -
384 (__u16) (port->serial->minor)) + 2) << 8;
385 dbg("mos7840_get_uart_reg application number is %x",
386 Wval);
387 }
388 }
389 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
390 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
391 MOS_WDR_TIMEOUT);
392 *val = buf[0];
393
394 kfree(buf);
395 return ret;
396}
397
398static void mos7840_dump_serial_port(struct moschip_port *mos7840_port)
399{
400
401 dbg("***************************************");
402 dbg("SpRegOffset is %2x", mos7840_port->SpRegOffset);
403 dbg("ControlRegOffset is %2x", mos7840_port->ControlRegOffset);
404 dbg("DCRRegOffset is %2x", mos7840_port->DcrRegOffset);
405 dbg("***************************************");
406
407}
408
409/************************************************************************/
410/************************************************************************/
411/* I N T E R F A C E F U N C T I O N S */
412/* I N T E R F A C E F U N C T I O N S */
413/************************************************************************/
414/************************************************************************/
415
416static inline void mos7840_set_port_private(struct usb_serial_port *port,
417 struct moschip_port *data)
418{
419 usb_set_serial_port_data(port, (void *)data);
420}
421
422static inline struct moschip_port *mos7840_get_port_private(struct
423 usb_serial_port
424 *port)
425{
426 return (struct moschip_port *)usb_get_serial_port_data(port);
427}
428
429static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
430{
431 struct moschip_port *mos7840_port;
432 struct async_icount *icount;
433 mos7840_port = port;
434 icount = &mos7840_port->icount;
435 if (new_msr &
436 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
437 MOS_MSR_DELTA_CD)) {
438 icount = &mos7840_port->icount;
439
440 /* update input line counters */
441 if (new_msr & MOS_MSR_DELTA_CTS) {
442 icount->cts++;
443 smp_wmb();
444 }
445 if (new_msr & MOS_MSR_DELTA_DSR) {
446 icount->dsr++;
447 smp_wmb();
448 }
449 if (new_msr & MOS_MSR_DELTA_CD) {
450 icount->dcd++;
451 smp_wmb();
452 }
453 if (new_msr & MOS_MSR_DELTA_RI) {
454 icount->rng++;
455 smp_wmb();
456 }
457 }
458}
459
460static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
461{
462 struct async_icount *icount;
463
464 dbg("%s - %02x", __func__, new_lsr);
465
466 if (new_lsr & SERIAL_LSR_BI) {
467 /*
468 * Parity and Framing errors only count if they
469 * occur exclusive of a break being
470 * received.
471 */
472 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
473 }
474
475 /* update input line counters */
476 icount = &port->icount;
477 if (new_lsr & SERIAL_LSR_BI) {
478 icount->brk++;
479 smp_wmb();
480 }
481 if (new_lsr & SERIAL_LSR_OE) {
482 icount->overrun++;
483 smp_wmb();
484 }
485 if (new_lsr & SERIAL_LSR_PE) {
486 icount->parity++;
487 smp_wmb();
488 }
489 if (new_lsr & SERIAL_LSR_FE) {
490 icount->frame++;
491 smp_wmb();
492 }
493}
494
495/************************************************************************/
496/************************************************************************/
497/* U S B C A L L B A C K F U N C T I O N S */
498/* U S B C A L L B A C K F U N C T I O N S */
499/************************************************************************/
500/************************************************************************/
501
502static void mos7840_control_callback(struct urb *urb)
503{
504 unsigned char *data;
505 struct moschip_port *mos7840_port;
506 __u8 regval = 0x0;
507 int result = 0;
508 int status = urb->status;
509
510 mos7840_port = urb->context;
511
512 switch (status) {
513 case 0:
514 /* success */
515 break;
516 case -ECONNRESET:
517 case -ENOENT:
518 case -ESHUTDOWN:
519 /* this urb is terminated, clean up */
520 dbg("%s - urb shutting down with status: %d", __func__,
521 status);
522 return;
523 default:
524 dbg("%s - nonzero urb status received: %d", __func__,
525 status);
526 goto exit;
527 }
528
529 dbg("%s urb buffer size is %d", __func__, urb->actual_length);
530 dbg("%s mos7840_port->MsrLsr is %d port %d", __func__,
531 mos7840_port->MsrLsr, mos7840_port->port_num);
532 data = urb->transfer_buffer;
533 regval = (__u8) data[0];
534 dbg("%s data is %x", __func__, regval);
535 if (mos7840_port->MsrLsr == 0)
536 mos7840_handle_new_msr(mos7840_port, regval);
537 else if (mos7840_port->MsrLsr == 1)
538 mos7840_handle_new_lsr(mos7840_port, regval);
539
540exit:
541 spin_lock(&mos7840_port->pool_lock);
542 if (!mos7840_port->zombie)
543 result = usb_submit_urb(mos7840_port->int_urb, GFP_ATOMIC);
544 spin_unlock(&mos7840_port->pool_lock);
545 if (result) {
546 dev_err(&urb->dev->dev,
547 "%s - Error %d submitting interrupt urb\n",
548 __func__, result);
549 }
550}
551
552static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
553 __u16 *val)
554{
555 struct usb_device *dev = mcs->port->serial->dev;
556 struct usb_ctrlrequest *dr = mcs->dr;
557 unsigned char *buffer = mcs->ctrl_buf;
558 int ret;
559
560 dr->bRequestType = MCS_RD_RTYPE;
561 dr->bRequest = MCS_RDREQ;
562 dr->wValue = cpu_to_le16(Wval); /* 0 */
563 dr->wIndex = cpu_to_le16(reg);
564 dr->wLength = cpu_to_le16(2);
565
566 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
567 (unsigned char *)dr, buffer, 2,
568 mos7840_control_callback, mcs);
569 mcs->control_urb->transfer_buffer_length = 2;
570 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
571 return ret;
572}
573
574/*****************************************************************************
575 * mos7840_interrupt_callback
576 * this is the callback function for when we have received data on the
577 * interrupt endpoint.
578 *****************************************************************************/
579
580static void mos7840_interrupt_callback(struct urb *urb)
581{
582 int result;
583 int length;
584 struct moschip_port *mos7840_port;
585 struct usb_serial *serial;
586 __u16 Data;
587 unsigned char *data;
588 __u8 sp[5], st;
589 int i, rv = 0;
590 __u16 wval, wreg = 0;
591 int status = urb->status;
592
593 dbg("%s", " : Entering");
594
595 switch (status) {
596 case 0:
597 /* success */
598 break;
599 case -ECONNRESET:
600 case -ENOENT:
601 case -ESHUTDOWN:
602 /* this urb is terminated, clean up */
603 dbg("%s - urb shutting down with status: %d", __func__,
604 status);
605 return;
606 default:
607 dbg("%s - nonzero urb status received: %d", __func__,
608 status);
609 goto exit;
610 }
611
612 length = urb->actual_length;
613 data = urb->transfer_buffer;
614
615 serial = urb->context;
616
617 /* Moschip get 5 bytes
618 * Byte 1 IIR Port 1 (port.number is 0)
619 * Byte 2 IIR Port 2 (port.number is 1)
620 * Byte 3 IIR Port 3 (port.number is 2)
621 * Byte 4 IIR Port 4 (port.number is 3)
622 * Byte 5 FIFO status for both */
623
624 if (length && length > 5) {
625 dbg("%s", "Wrong data !!!");
626 return;
627 }
628
629 sp[0] = (__u8) data[0];
630 sp[1] = (__u8) data[1];
631 sp[2] = (__u8) data[2];
632 sp[3] = (__u8) data[3];
633 st = (__u8) data[4];
634
635 for (i = 0; i < serial->num_ports; i++) {
636 mos7840_port = mos7840_get_port_private(serial->port[i]);
637 wval =
638 (((__u16) serial->port[i]->number -
639 (__u16) (serial->minor)) + 1) << 8;
640 if (mos7840_port->open) {
641 if (sp[i] & 0x01) {
642 dbg("SP%d No Interrupt !!!", i);
643 } else {
644 switch (sp[i] & 0x0f) {
645 case SERIAL_IIR_RLS:
646 dbg("Serial Port %d: Receiver status error or ", i);
647 dbg("address bit detected in 9-bit mode");
648 mos7840_port->MsrLsr = 1;
649 wreg = LINE_STATUS_REGISTER;
650 break;
651 case SERIAL_IIR_MS:
652 dbg("Serial Port %d: Modem status change", i);
653 mos7840_port->MsrLsr = 0;
654 wreg = MODEM_STATUS_REGISTER;
655 break;
656 }
657 spin_lock(&mos7840_port->pool_lock);
658 if (!mos7840_port->zombie) {
659 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
660 } else {
661 spin_unlock(&mos7840_port->pool_lock);
662 return;
663 }
664 spin_unlock(&mos7840_port->pool_lock);
665 }
666 }
667 }
668 if (!(rv < 0))
669 /* the completion handler for the control urb will resubmit */
670 return;
671exit:
672 result = usb_submit_urb(urb, GFP_ATOMIC);
673 if (result) {
674 dev_err(&urb->dev->dev,
675 "%s - Error %d submitting interrupt urb\n",
676 __func__, result);
677 }
678}
679
680static int mos7840_port_paranoia_check(struct usb_serial_port *port,
681 const char *function)
682{
683 if (!port) {
684 dbg("%s - port == NULL", function);
685 return -1;
686 }
687 if (!port->serial) {
688 dbg("%s - port->serial == NULL", function);
689 return -1;
690 }
691
692 return 0;
693}
694
695/* Inline functions to check the sanity of a pointer that is passed to us */
696static int mos7840_serial_paranoia_check(struct usb_serial *serial,
697 const char *function)
698{
699 if (!serial) {
700 dbg("%s - serial == NULL", function);
701 return -1;
702 }
703 if (!serial->type) {
704 dbg("%s - serial->type == NULL!", function);
705 return -1;
706 }
707
708 return 0;
709}
710
711static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
712 const char *function)
713{
714 /* if no port was specified, or it fails a paranoia check */
715 if (!port ||
716 mos7840_port_paranoia_check(port, function) ||
717 mos7840_serial_paranoia_check(port->serial, function)) {
718 /* then say that we don't have a valid usb_serial thing,
719 * which will end up genrating -ENODEV return values */
720 return NULL;
721 }
722
723 return port->serial;
724}
725
726/*****************************************************************************
727 * mos7840_bulk_in_callback
728 * this is the callback function for when we have received data on the
729 * bulk in endpoint.
730 *****************************************************************************/
731
732static void mos7840_bulk_in_callback(struct urb *urb)
733{
734 int retval;
735 unsigned char *data;
736 struct usb_serial *serial;
737 struct usb_serial_port *port;
738 struct moschip_port *mos7840_port;
739 struct tty_struct *tty;
740 int status = urb->status;
741
742 mos7840_port = urb->context;
743 if (!mos7840_port) {
744 dbg("%s", "NULL mos7840_port pointer");
745 return;
746 }
747
748 if (status) {
749 dbg("nonzero read bulk status received: %d", status);
750 mos7840_port->read_urb_busy = false;
751 return;
752 }
753
754 port = (struct usb_serial_port *)mos7840_port->port;
755 if (mos7840_port_paranoia_check(port, __func__)) {
756 dbg("%s", "Port Paranoia failed");
757 mos7840_port->read_urb_busy = false;
758 return;
759 }
760
761 serial = mos7840_get_usb_serial(port, __func__);
762 if (!serial) {
763 dbg("%s", "Bad serial pointer");
764 mos7840_port->read_urb_busy = false;
765 return;
766 }
767
768 dbg("%s", "Entering... ");
769
770 data = urb->transfer_buffer;
771
772 dbg("%s", "Entering ...........");
773
774 if (urb->actual_length) {
775 tty = tty_port_tty_get(&mos7840_port->port->port);
776 if (tty) {
777 tty_insert_flip_string(tty, data, urb->actual_length);
778 dbg(" %s ", data);
779 tty_flip_buffer_push(tty);
780 tty_kref_put(tty);
781 }
782 mos7840_port->icount.rx += urb->actual_length;
783 smp_wmb();
784 dbg("mos7840_port->icount.rx is %d:",
785 mos7840_port->icount.rx);
786 }
787
788 if (!mos7840_port->read_urb) {
789 dbg("%s", "URB KILLED !!!");
790 mos7840_port->read_urb_busy = false;
791 return;
792 }
793
794
795 mos7840_port->read_urb->dev = serial->dev;
796
797 mos7840_port->read_urb_busy = true;
798 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
799
800 if (retval) {
801 dbg("usb_submit_urb(read bulk) failed, retval = %d", retval);
802 mos7840_port->read_urb_busy = false;
803 }
804}
805
806/*****************************************************************************
807 * mos7840_bulk_out_data_callback
808 * this is the callback function for when we have finished sending
809 * serial data on the bulk out endpoint.
810 *****************************************************************************/
811
812static void mos7840_bulk_out_data_callback(struct urb *urb)
813{
814 struct moschip_port *mos7840_port;
815 struct tty_struct *tty;
816 int status = urb->status;
817 int i;
818
819 mos7840_port = urb->context;
820 spin_lock(&mos7840_port->pool_lock);
821 for (i = 0; i < NUM_URBS; i++) {
822 if (urb == mos7840_port->write_urb_pool[i]) {
823 mos7840_port->busy[i] = 0;
824 break;
825 }
826 }
827 spin_unlock(&mos7840_port->pool_lock);
828
829 if (status) {
830 dbg("nonzero write bulk status received:%d", status);
831 return;
832 }
833
834 if (mos7840_port_paranoia_check(mos7840_port->port, __func__)) {
835 dbg("%s", "Port Paranoia failed");
836 return;
837 }
838
839 dbg("%s", "Entering .........");
840
841 tty = tty_port_tty_get(&mos7840_port->port->port);
842 if (tty && mos7840_port->open)
843 tty_wakeup(tty);
844 tty_kref_put(tty);
845
846}
847
848/************************************************************************/
849/* 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 */
850/************************************************************************/
851#ifdef MCSSerialProbe
852static int mos7840_serial_probe(struct usb_serial *serial,
853 const struct usb_device_id *id)
854{
855
856 /*need to implement the mode_reg reading and updating\
857 structures usb_serial_ device_type\
858 (i.e num_ports, num_bulkin,bulkout etc) */
859 /* Also we can update the changes attach */
860 return 1;
861}
862#endif
863
864/*****************************************************************************
865 * mos7840_open
866 * this function is called by the tty driver when a port is opened
867 * If successful, we return 0
868 * Otherwise we return a negative error number.
869 *****************************************************************************/
870
871static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
872{
873 int response;
874 int j;
875 struct usb_serial *serial;
876 struct urb *urb;
877 __u16 Data;
878 int status;
879 struct moschip_port *mos7840_port;
880 struct moschip_port *port0;
881
882 dbg ("%s enter", __func__);
883
884 if (mos7840_port_paranoia_check(port, __func__)) {
885 dbg("%s", "Port Paranoia failed");
886 return -ENODEV;
887 }
888
889 serial = port->serial;
890
891 if (mos7840_serial_paranoia_check(serial, __func__)) {
892 dbg("%s", "Serial Paranoia failed");
893 return -ENODEV;
894 }
895
896 mos7840_port = mos7840_get_port_private(port);
897 port0 = mos7840_get_port_private(serial->port[0]);
898
899 if (mos7840_port == NULL || port0 == NULL)
900 return -ENODEV;
901
902 usb_clear_halt(serial->dev, port->write_urb->pipe);
903 usb_clear_halt(serial->dev, port->read_urb->pipe);
904 port0->open_ports++;
905
906 /* Initialising the write urb pool */
907 for (j = 0; j < NUM_URBS; ++j) {
908 urb = usb_alloc_urb(0, GFP_KERNEL);
909 mos7840_port->write_urb_pool[j] = urb;
910
911 if (urb == NULL) {
912 dev_err(&port->dev, "No more urbs???\n");
913 continue;
914 }
915
916 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
917 GFP_KERNEL);
918 if (!urb->transfer_buffer) {
919 usb_free_urb(urb);
920 mos7840_port->write_urb_pool[j] = NULL;
921 dev_err(&port->dev,
922 "%s-out of memory for urb buffers.\n",
923 __func__);
924 continue;
925 }
926 }
927
928/*****************************************************************************
929 * Initialize MCS7840 -- Write Init values to corresponding Registers
930 *
931 * Register Index
932 * 1 : IER
933 * 2 : FCR
934 * 3 : LCR
935 * 4 : MCR
936 *
937 * 0x08 : SP1/2 Control Reg
938 *****************************************************************************/
939
940 /* NEED to check the following Block */
941
942 Data = 0x0;
943 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
944 if (status < 0) {
945 dbg("Reading Spreg failed");
946 return -1;
947 }
948 Data |= 0x80;
949 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
950 if (status < 0) {
951 dbg("writing Spreg failed");
952 return -1;
953 }
954
955 Data &= ~0x80;
956 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
957 if (status < 0) {
958 dbg("writing Spreg failed");
959 return -1;
960 }
961 /* End of block to be checked */
962
963 Data = 0x0;
964 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
965 &Data);
966 if (status < 0) {
967 dbg("Reading Controlreg failed");
968 return -1;
969 }
970 Data |= 0x08; /* Driver done bit */
971 Data |= 0x20; /* rx_disable */
972 status = mos7840_set_reg_sync(port,
973 mos7840_port->ControlRegOffset, Data);
974 if (status < 0) {
975 dbg("writing Controlreg failed");
976 return -1;
977 }
978 /* do register settings here */
979 /* Set all regs to the device default values. */
980 /***********************************
981 * First Disable all interrupts.
982 ***********************************/
983 Data = 0x00;
984 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
985 if (status < 0) {
986 dbg("disabling interrupts failed");
987 return -1;
988 }
989 /* Set FIFO_CONTROL_REGISTER to the default value */
990 Data = 0x00;
991 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
992 if (status < 0) {
993 dbg("Writing FIFO_CONTROL_REGISTER failed");
994 return -1;
995 }
996
997 Data = 0xcf;
998 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
999 if (status < 0) {
1000 dbg("Writing FIFO_CONTROL_REGISTER failed");
1001 return -1;
1002 }
1003
1004 Data = 0x03;
1005 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1006 mos7840_port->shadowLCR = Data;
1007
1008 Data = 0x0b;
1009 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1010 mos7840_port->shadowMCR = Data;
1011
1012 Data = 0x00;
1013 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1014 mos7840_port->shadowLCR = Data;
1015
1016 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1017 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1018
1019 Data = 0x0c;
1020 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1021
1022 Data = 0x0;
1023 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1024
1025 Data = 0x00;
1026 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1027
1028 Data = Data & ~SERIAL_LCR_DLAB;
1029 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1030 mos7840_port->shadowLCR = Data;
1031
1032 /* clearing Bulkin and Bulkout Fifo */
1033 Data = 0x0;
1034 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
1035
1036 Data = Data | 0x0c;
1037 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1038
1039 Data = Data & ~0x0c;
1040 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1041 /* Finally enable all interrupts */
1042 Data = 0x0c;
1043 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1044
1045 /* clearing rx_disable */
1046 Data = 0x0;
1047 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1048 &Data);
1049 Data = Data & ~0x20;
1050 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1051 Data);
1052
1053 /* rx_negate */
1054 Data = 0x0;
1055 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1056 &Data);
1057 Data = Data | 0x10;
1058 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1059 Data);
1060
1061 /* Check to see if we've set up our endpoint info yet *
1062 * (can't set it up in mos7840_startup as the structures *
1063 * were not set up at that time.) */
1064 if (port0->open_ports == 1) {
1065 if (serial->port[0]->interrupt_in_buffer == NULL) {
1066 /* set up interrupt urb */
1067 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1068 serial->dev,
1069 usb_rcvintpipe(serial->dev,
1070 serial->port[0]->interrupt_in_endpointAddress),
1071 serial->port[0]->interrupt_in_buffer,
1072 serial->port[0]->interrupt_in_urb->
1073 transfer_buffer_length,
1074 mos7840_interrupt_callback,
1075 serial,
1076 serial->port[0]->interrupt_in_urb->interval);
1077
1078 /* start interrupt read for mos7840 *
1079 * will continue as long as mos7840 is connected */
1080
1081 response =
1082 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1083 GFP_KERNEL);
1084 if (response) {
1085 dev_err(&port->dev, "%s - Error %d submitting "
1086 "interrupt urb\n", __func__, response);
1087 }
1088
1089 }
1090
1091 }
1092
1093 /* see if we've set up our endpoint info yet *
1094 * (can't set it up in mos7840_startup as the *
1095 * structures were not set up at that time.) */
1096
1097 dbg("port number is %d", port->number);
1098 dbg("serial number is %d", port->serial->minor);
1099 dbg("Bulkin endpoint is %d", port->bulk_in_endpointAddress);
1100 dbg("BulkOut endpoint is %d", port->bulk_out_endpointAddress);
1101 dbg("Interrupt endpoint is %d", port->interrupt_in_endpointAddress);
1102 dbg("port's number in the device is %d", mos7840_port->port_num);
1103 mos7840_port->read_urb = port->read_urb;
1104
1105 /* set up our bulk in urb */
1106
1107 usb_fill_bulk_urb(mos7840_port->read_urb,
1108 serial->dev,
1109 usb_rcvbulkpipe(serial->dev,
1110 port->bulk_in_endpointAddress),
1111 port->bulk_in_buffer,
1112 mos7840_port->read_urb->transfer_buffer_length,
1113 mos7840_bulk_in_callback, mos7840_port);
1114
1115 dbg("mos7840_open: bulkin endpoint is %d",
1116 port->bulk_in_endpointAddress);
1117 mos7840_port->read_urb_busy = true;
1118 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1119 if (response) {
1120 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1121 __func__, response);
1122 mos7840_port->read_urb_busy = false;
1123 }
1124
1125 /* initialize our wait queues */
1126 init_waitqueue_head(&mos7840_port->wait_chase);
1127 init_waitqueue_head(&mos7840_port->delta_msr_wait);
1128
1129 /* initialize our icount structure */
1130 memset(&(mos7840_port->icount), 0x00, sizeof(mos7840_port->icount));
1131
1132 /* initialize our port settings */
1133 /* Must set to enable ints! */
1134 mos7840_port->shadowMCR = MCR_MASTER_IE;
1135 /* send a open port command */
1136 mos7840_port->open = 1;
1137 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1138 mos7840_port->icount.tx = 0;
1139 mos7840_port->icount.rx = 0;
1140
1141 dbg("usb_serial serial:%p mos7840_port:%p\n usb_serial_port port:%p",
1142 serial, mos7840_port, port);
1143
1144 dbg ("%s leave", __func__);
1145
1146 return 0;
1147
1148}
1149
1150/*****************************************************************************
1151 * mos7840_chars_in_buffer
1152 * this function is called by the tty driver when it wants to know how many
1153 * bytes of data we currently have outstanding in the port (data that has
1154 * been written, but hasn't made it out the port yet)
1155 * If successful, we return the number of bytes left to be written in the
1156 * system,
1157 * Otherwise we return zero.
1158 *****************************************************************************/
1159
1160static int mos7840_chars_in_buffer(struct tty_struct *tty)
1161{
1162 struct usb_serial_port *port = tty->driver_data;
1163 int i;
1164 int chars = 0;
1165 unsigned long flags;
1166 struct moschip_port *mos7840_port;
1167
1168 dbg("%s", " mos7840_chars_in_buffer:entering ...........");
1169
1170 if (mos7840_port_paranoia_check(port, __func__)) {
1171 dbg("%s", "Invalid port");
1172 return 0;
1173 }
1174
1175 mos7840_port = mos7840_get_port_private(port);
1176 if (mos7840_port == NULL) {
1177 dbg("%s", "mos7840_break:leaving ...........");
1178 return 0;
1179 }
1180
1181 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1182 for (i = 0; i < NUM_URBS; ++i)
1183 if (mos7840_port->busy[i])
1184 chars += URB_TRANSFER_BUFFER_SIZE;
1185 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1186 dbg("%s - returns %d", __func__, chars);
1187 return chars;
1188
1189}
1190
1191/*****************************************************************************
1192 * mos7840_close
1193 * this function is called by the tty driver when a port is closed
1194 *****************************************************************************/
1195
1196static void mos7840_close(struct usb_serial_port *port)
1197{
1198 struct usb_serial *serial;
1199 struct moschip_port *mos7840_port;
1200 struct moschip_port *port0;
1201 int j;
1202 __u16 Data;
1203
1204 dbg("%s", "mos7840_close:entering...");
1205
1206 if (mos7840_port_paranoia_check(port, __func__)) {
1207 dbg("%s", "Port Paranoia failed");
1208 return;
1209 }
1210
1211 serial = mos7840_get_usb_serial(port, __func__);
1212 if (!serial) {
1213 dbg("%s", "Serial Paranoia failed");
1214 return;
1215 }
1216
1217 mos7840_port = mos7840_get_port_private(port);
1218 port0 = mos7840_get_port_private(serial->port[0]);
1219
1220 if (mos7840_port == NULL || port0 == NULL)
1221 return;
1222
1223 for (j = 0; j < NUM_URBS; ++j)
1224 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1225
1226 /* Freeing Write URBs */
1227 for (j = 0; j < NUM_URBS; ++j) {
1228 if (mos7840_port->write_urb_pool[j]) {
1229 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1230 kfree(mos7840_port->write_urb_pool[j]->
1231 transfer_buffer);
1232
1233 usb_free_urb(mos7840_port->write_urb_pool[j]);
1234 }
1235 }
1236
1237 /* While closing port, shutdown all bulk read, write *
1238 * and interrupt read if they exists */
1239 if (serial->dev) {
1240 if (mos7840_port->write_urb) {
1241 dbg("%s", "Shutdown bulk write");
1242 usb_kill_urb(mos7840_port->write_urb);
1243 }
1244 if (mos7840_port->read_urb) {
1245 dbg("%s", "Shutdown bulk read");
1246 usb_kill_urb(mos7840_port->read_urb);
1247 mos7840_port->read_urb_busy = false;
1248 }
1249 if ((&mos7840_port->control_urb)) {
1250 dbg("%s", "Shutdown control read");
1251 /*/ usb_kill_urb (mos7840_port->control_urb); */
1252 }
1253 }
1254/* if(mos7840_port->ctrl_buf != NULL) */
1255/* kfree(mos7840_port->ctrl_buf); */
1256 port0->open_ports--;
1257 dbg("mos7840_num_open_ports in close%d:in port%d",
1258 port0->open_ports, port->number);
1259 if (port0->open_ports == 0) {
1260 if (serial->port[0]->interrupt_in_urb) {
1261 dbg("%s", "Shutdown interrupt_in_urb");
1262 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1263 }
1264 }
1265
1266 if (mos7840_port->write_urb) {
1267 /* if this urb had a transfer buffer already (old tx) free it */
1268 if (mos7840_port->write_urb->transfer_buffer != NULL)
1269 kfree(mos7840_port->write_urb->transfer_buffer);
1270 usb_free_urb(mos7840_port->write_urb);
1271 }
1272
1273 Data = 0x0;
1274 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1275
1276 Data = 0x00;
1277 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1278
1279 mos7840_port->open = 0;
1280
1281 dbg("%s", "Leaving ............");
1282}
1283
1284/************************************************************************
1285 *
1286 * mos7840_block_until_chase_response
1287 *
1288 * This function will block the close until one of the following:
1289 * 1. Response to our Chase comes from mos7840
1290 * 2. A timeout of 10 seconds without activity has expired
1291 * (1K of mos7840 data @ 2400 baud ==> 4 sec to empty)
1292 *
1293 ************************************************************************/
1294
1295static void mos7840_block_until_chase_response(struct tty_struct *tty,
1296 struct moschip_port *mos7840_port)
1297{
1298 int timeout = 1 * HZ;
1299 int wait = 10;
1300 int count;
1301
1302 while (1) {
1303 count = mos7840_chars_in_buffer(tty);
1304
1305 /* Check for Buffer status */
1306 if (count <= 0)
1307 return;
1308
1309 /* Block the thread for a while */
1310 interruptible_sleep_on_timeout(&mos7840_port->wait_chase,
1311 timeout);
1312 /* No activity.. count down section */
1313 wait--;
1314 if (wait == 0) {
1315 dbg("%s - TIMEOUT", __func__);
1316 return;
1317 } else {
1318 /* Reset timeout value back to seconds */
1319 wait = 10;
1320 }
1321 }
1322
1323}
1324
1325/*****************************************************************************
1326 * mos7840_break
1327 * this function sends a break to the port
1328 *****************************************************************************/
1329static void mos7840_break(struct tty_struct *tty, int break_state)
1330{
1331 struct usb_serial_port *port = tty->driver_data;
1332 unsigned char data;
1333 struct usb_serial *serial;
1334 struct moschip_port *mos7840_port;
1335
1336 dbg("%s", "Entering ...........");
1337 dbg("mos7840_break: Start");
1338
1339 if (mos7840_port_paranoia_check(port, __func__)) {
1340 dbg("%s", "Port Paranoia failed");
1341 return;
1342 }
1343
1344 serial = mos7840_get_usb_serial(port, __func__);
1345 if (!serial) {
1346 dbg("%s", "Serial Paranoia failed");
1347 return;
1348 }
1349
1350 mos7840_port = mos7840_get_port_private(port);
1351
1352 if (mos7840_port == NULL)
1353 return;
1354
1355 if (serial->dev)
1356 /* flush and block until tx is empty */
1357 mos7840_block_until_chase_response(tty, mos7840_port);
1358
1359 if (break_state == -1)
1360 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1361 else
1362 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1363
1364 /* FIXME: no locking on shadowLCR anywhere in driver */
1365 mos7840_port->shadowLCR = data;
1366 dbg("mcs7840_break mos7840_port->shadowLCR is %x",
1367 mos7840_port->shadowLCR);
1368 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1369 mos7840_port->shadowLCR);
1370}
1371
1372/*****************************************************************************
1373 * mos7840_write_room
1374 * this function is called by the tty driver when it wants to know how many
1375 * bytes of data we can accept for a specific port.
1376 * If successful, we return the amount of room that we have for this port
1377 * Otherwise we return a negative error number.
1378 *****************************************************************************/
1379
1380static int mos7840_write_room(struct tty_struct *tty)
1381{
1382 struct usb_serial_port *port = tty->driver_data;
1383 int i;
1384 int room = 0;
1385 unsigned long flags;
1386 struct moschip_port *mos7840_port;
1387
1388 dbg("%s", " mos7840_write_room:entering ...........");
1389
1390 if (mos7840_port_paranoia_check(port, __func__)) {
1391 dbg("%s", "Invalid port");
1392 dbg("%s", " mos7840_write_room:leaving ...........");
1393 return -1;
1394 }
1395
1396 mos7840_port = mos7840_get_port_private(port);
1397 if (mos7840_port == NULL) {
1398 dbg("%s", "mos7840_break:leaving ...........");
1399 return -1;
1400 }
1401
1402 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1403 for (i = 0; i < NUM_URBS; ++i) {
1404 if (!mos7840_port->busy[i])
1405 room += URB_TRANSFER_BUFFER_SIZE;
1406 }
1407 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1408
1409 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1410 dbg("%s - returns %d", __func__, room);
1411 return room;
1412
1413}
1414
1415/*****************************************************************************
1416 * mos7840_write
1417 * this function is called by the tty driver when data should be written to
1418 * the port.
1419 * If successful, we return the number of bytes written, otherwise we
1420 * return a negative error number.
1421 *****************************************************************************/
1422
1423static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1424 const unsigned char *data, int count)
1425{
1426 int status;
1427 int i;
1428 int bytes_sent = 0;
1429 int transfer_size;
1430 unsigned long flags;
1431
1432 struct moschip_port *mos7840_port;
1433 struct usb_serial *serial;
1434 struct urb *urb;
1435 /* __u16 Data; */
1436 const unsigned char *current_position = data;
1437 unsigned char *data1;
1438 dbg("%s", "entering ...........");
1439 /* dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1440 mos7840_port->shadowLCR); */
1441
1442#ifdef NOTMOS7840
1443 Data = 0x00;
1444 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1445 mos7840_port->shadowLCR = Data;
1446 dbg("mos7840_write: LINE_CONTROL_REGISTER is %x", Data);
1447 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1448 mos7840_port->shadowLCR);
1449
1450 /* Data = 0x03; */
1451 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1452 /* mos7840_port->shadowLCR=Data;//Need to add later */
1453
1454 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1455 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1456
1457 /* Data = 0x0c; */
1458 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1459 Data = 0x00;
1460 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1461 dbg("mos7840_write:DLL value is %x", Data);
1462
1463 Data = 0x0;
1464 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1465 dbg("mos7840_write:DLM value is %x", Data);
1466
1467 Data = Data & ~SERIAL_LCR_DLAB;
1468 dbg("mos7840_write: mos7840_port->shadowLCR is %x",
1469 mos7840_port->shadowLCR);
1470 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1471#endif
1472
1473 if (mos7840_port_paranoia_check(port, __func__)) {
1474 dbg("%s", "Port Paranoia failed");
1475 return -1;
1476 }
1477
1478 serial = port->serial;
1479 if (mos7840_serial_paranoia_check(serial, __func__)) {
1480 dbg("%s", "Serial Paranoia failed");
1481 return -1;
1482 }
1483
1484 mos7840_port = mos7840_get_port_private(port);
1485 if (mos7840_port == NULL) {
1486 dbg("%s", "mos7840_port is NULL");
1487 return -1;
1488 }
1489
1490 /* try to find a free urb in the list */
1491 urb = NULL;
1492
1493 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1494 for (i = 0; i < NUM_URBS; ++i) {
1495 if (!mos7840_port->busy[i]) {
1496 mos7840_port->busy[i] = 1;
1497 urb = mos7840_port->write_urb_pool[i];
1498 dbg("URB:%d", i);
1499 break;
1500 }
1501 }
1502 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1503
1504 if (urb == NULL) {
1505 dbg("%s - no more free urbs", __func__);
1506 goto exit;
1507 }
1508
1509 if (urb->transfer_buffer == NULL) {
1510 urb->transfer_buffer =
1511 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1512
1513 if (urb->transfer_buffer == NULL) {
1514 dev_err(&port->dev, "%s no more kernel memory...\n",
1515 __func__);
1516 goto exit;
1517 }
1518 }
1519 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1520
1521 memcpy(urb->transfer_buffer, current_position, transfer_size);
1522
1523 /* fill urb with data and submit */
1524 usb_fill_bulk_urb(urb,
1525 serial->dev,
1526 usb_sndbulkpipe(serial->dev,
1527 port->bulk_out_endpointAddress),
1528 urb->transfer_buffer,
1529 transfer_size,
1530 mos7840_bulk_out_data_callback, mos7840_port);
1531
1532 data1 = urb->transfer_buffer;
1533 dbg("bulkout endpoint is %d", port->bulk_out_endpointAddress);
1534
1535 /* send it down the pipe */
1536 status = usb_submit_urb(urb, GFP_ATOMIC);
1537
1538 if (status) {
1539 mos7840_port->busy[i] = 0;
1540 dev_err(&port->dev, "%s - usb_submit_urb(write bulk) failed "
1541 "with status = %d\n", __func__, status);
1542 bytes_sent = status;
1543 goto exit;
1544 }
1545 bytes_sent = transfer_size;
1546 mos7840_port->icount.tx += transfer_size;
1547 smp_wmb();
1548 dbg("mos7840_port->icount.tx is %d:", mos7840_port->icount.tx);
1549exit:
1550 return bytes_sent;
1551
1552}
1553
1554/*****************************************************************************
1555 * mos7840_throttle
1556 * this function is called by the tty driver when it wants to stop the data
1557 * being read from the port.
1558 *****************************************************************************/
1559
1560static void mos7840_throttle(struct tty_struct *tty)
1561{
1562 struct usb_serial_port *port = tty->driver_data;
1563 struct moschip_port *mos7840_port;
1564 int status;
1565
1566 if (mos7840_port_paranoia_check(port, __func__)) {
1567 dbg("%s", "Invalid port");
1568 return;
1569 }
1570
1571 dbg("- port %d", port->number);
1572
1573 mos7840_port = mos7840_get_port_private(port);
1574
1575 if (mos7840_port == NULL)
1576 return;
1577
1578 if (!mos7840_port->open) {
1579 dbg("%s", "port not opened");
1580 return;
1581 }
1582
1583 dbg("%s", "Entering ..........");
1584
1585 /* if we are implementing XON/XOFF, send the stop character */
1586 if (I_IXOFF(tty)) {
1587 unsigned char stop_char = STOP_CHAR(tty);
1588 status = mos7840_write(tty, port, &stop_char, 1);
1589 if (status <= 0)
1590 return;
1591 }
1592 /* if we are implementing RTS/CTS, toggle that line */
1593 if (tty->termios->c_cflag & CRTSCTS) {
1594 mos7840_port->shadowMCR &= ~MCR_RTS;
1595 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1596 mos7840_port->shadowMCR);
1597 if (status < 0)
1598 return;
1599 }
1600}
1601
1602/*****************************************************************************
1603 * mos7840_unthrottle
1604 * this function is called by the tty driver when it wants to resume
1605 * the data being read from the port (called after mos7840_throttle is
1606 * called)
1607 *****************************************************************************/
1608static void mos7840_unthrottle(struct tty_struct *tty)
1609{
1610 struct usb_serial_port *port = tty->driver_data;
1611 int status;
1612 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1613
1614 if (mos7840_port_paranoia_check(port, __func__)) {
1615 dbg("%s", "Invalid port");
1616 return;
1617 }
1618
1619 if (mos7840_port == NULL)
1620 return;
1621
1622 if (!mos7840_port->open) {
1623 dbg("%s - port not opened", __func__);
1624 return;
1625 }
1626
1627 dbg("%s", "Entering ..........");
1628
1629 /* if we are implementing XON/XOFF, send the start character */
1630 if (I_IXOFF(tty)) {
1631 unsigned char start_char = START_CHAR(tty);
1632 status = mos7840_write(tty, port, &start_char, 1);
1633 if (status <= 0)
1634 return;
1635 }
1636
1637 /* if we are implementing RTS/CTS, toggle that line */
1638 if (tty->termios->c_cflag & CRTSCTS) {
1639 mos7840_port->shadowMCR |= MCR_RTS;
1640 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1641 mos7840_port->shadowMCR);
1642 if (status < 0)
1643 return;
1644 }
1645}
1646
1647static int mos7840_tiocmget(struct tty_struct *tty)
1648{
1649 struct usb_serial_port *port = tty->driver_data;
1650 struct moschip_port *mos7840_port;
1651 unsigned int result;
1652 __u16 msr;
1653 __u16 mcr;
1654 int status;
1655 mos7840_port = mos7840_get_port_private(port);
1656
1657 dbg("%s - port %d", __func__, port->number);
1658
1659 if (mos7840_port == NULL)
1660 return -ENODEV;
1661
1662 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1663 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1664 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1665 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1666 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1667 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1668 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1669 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1670 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1671
1672 dbg("%s - 0x%04X", __func__, result);
1673
1674 return result;
1675}
1676
1677static int mos7840_tiocmset(struct tty_struct *tty,
1678 unsigned int set, unsigned int clear)
1679{
1680 struct usb_serial_port *port = tty->driver_data;
1681 struct moschip_port *mos7840_port;
1682 unsigned int mcr;
1683 int status;
1684
1685 dbg("%s - port %d", __func__, port->number);
1686
1687 mos7840_port = mos7840_get_port_private(port);
1688
1689 if (mos7840_port == NULL)
1690 return -ENODEV;
1691
1692 /* FIXME: What locks the port registers ? */
1693 mcr = mos7840_port->shadowMCR;
1694 if (clear & TIOCM_RTS)
1695 mcr &= ~MCR_RTS;
1696 if (clear & TIOCM_DTR)
1697 mcr &= ~MCR_DTR;
1698 if (clear & TIOCM_LOOP)
1699 mcr &= ~MCR_LOOPBACK;
1700
1701 if (set & TIOCM_RTS)
1702 mcr |= MCR_RTS;
1703 if (set & TIOCM_DTR)
1704 mcr |= MCR_DTR;
1705 if (set & TIOCM_LOOP)
1706 mcr |= MCR_LOOPBACK;
1707
1708 mos7840_port->shadowMCR = mcr;
1709
1710 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1711 if (status < 0) {
1712 dbg("setting MODEM_CONTROL_REGISTER Failed");
1713 return status;
1714 }
1715
1716 return 0;
1717}
1718
1719/*****************************************************************************
1720 * mos7840_calc_baud_rate_divisor
1721 * this function calculates the proper baud rate divisor for the specified
1722 * baud rate.
1723 *****************************************************************************/
1724static int mos7840_calc_baud_rate_divisor(int baudRate, int *divisor,
1725 __u16 *clk_sel_val)
1726{
1727
1728 dbg("%s - %d", __func__, baudRate);
1729
1730 if (baudRate <= 115200) {
1731 *divisor = 115200 / baudRate;
1732 *clk_sel_val = 0x0;
1733 }
1734 if ((baudRate > 115200) && (baudRate <= 230400)) {
1735 *divisor = 230400 / baudRate;
1736 *clk_sel_val = 0x10;
1737 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1738 *divisor = 403200 / baudRate;
1739 *clk_sel_val = 0x20;
1740 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1741 *divisor = 460800 / baudRate;
1742 *clk_sel_val = 0x30;
1743 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1744 *divisor = 806400 / baudRate;
1745 *clk_sel_val = 0x40;
1746 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1747 *divisor = 921600 / baudRate;
1748 *clk_sel_val = 0x50;
1749 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1750 *divisor = 1572864 / baudRate;
1751 *clk_sel_val = 0x60;
1752 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1753 *divisor = 3145728 / baudRate;
1754 *clk_sel_val = 0x70;
1755 }
1756 return 0;
1757
1758#ifdef NOTMCS7840
1759
1760 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1761 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1762 *divisor = mos7840_divisor_table[i].Divisor;
1763 return 0;
1764 }
1765 }
1766
1767 /* After trying for all the standard baud rates *
1768 * Try calculating the divisor for this baud rate */
1769
1770 if (baudrate > 75 && baudrate < 230400) {
1771 /* get the divisor */
1772 custom = (__u16) (230400L / baudrate);
1773
1774 /* Check for round off */
1775 round1 = (__u16) (2304000L / baudrate);
1776 round = (__u16) (round1 - (custom * 10));
1777 if (round > 4)
1778 custom++;
1779 *divisor = custom;
1780
1781 dbg(" Baud %d = %d", baudrate, custom);
1782 return 0;
1783 }
1784
1785 dbg("%s", " Baud calculation Failed...");
1786 return -1;
1787#endif
1788}
1789
1790/*****************************************************************************
1791 * mos7840_send_cmd_write_baud_rate
1792 * this function sends the proper command to change the baud rate of the
1793 * specified port.
1794 *****************************************************************************/
1795
1796static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1797 int baudRate)
1798{
1799 int divisor = 0;
1800 int status;
1801 __u16 Data;
1802 unsigned char number;
1803 __u16 clk_sel_val;
1804 struct usb_serial_port *port;
1805
1806 if (mos7840_port == NULL)
1807 return -1;
1808
1809 port = (struct usb_serial_port *)mos7840_port->port;
1810 if (mos7840_port_paranoia_check(port, __func__)) {
1811 dbg("%s", "Invalid port");
1812 return -1;
1813 }
1814
1815 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1816 dbg("%s", "Invalid Serial");
1817 return -1;
1818 }
1819
1820 dbg("%s", "Entering ..........");
1821
1822 number = mos7840_port->port->number - mos7840_port->port->serial->minor;
1823
1824 dbg("%s - port = %d, baud = %d", __func__,
1825 mos7840_port->port->number, baudRate);
1826 /* reset clk_uart_sel in spregOffset */
1827 if (baudRate > 115200) {
1828#ifdef HW_flow_control
1829 /* NOTE: need to see the pther register to modify */
1830 /* setting h/w flow control bit to 1 */
1831 Data = 0x2b;
1832 mos7840_port->shadowMCR = Data;
1833 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1834 Data);
1835 if (status < 0) {
1836 dbg("Writing spreg failed in set_serial_baud");
1837 return -1;
1838 }
1839#endif
1840
1841 } else {
1842#ifdef HW_flow_control
1843 / *setting h/w flow control bit to 0 */
1844 Data = 0xb;
1845 mos7840_port->shadowMCR = Data;
1846 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1847 Data);
1848 if (status < 0) {
1849 dbg("Writing spreg failed in set_serial_baud");
1850 return -1;
1851 }
1852#endif
1853
1854 }
1855
1856 if (1) { /* baudRate <= 115200) */
1857 clk_sel_val = 0x0;
1858 Data = 0x0;
1859 status = mos7840_calc_baud_rate_divisor(baudRate, &divisor,
1860 &clk_sel_val);
1861 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1862 &Data);
1863 if (status < 0) {
1864 dbg("reading spreg failed in set_serial_baud");
1865 return -1;
1866 }
1867 Data = (Data & 0x8f) | clk_sel_val;
1868 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1869 Data);
1870 if (status < 0) {
1871 dbg("Writing spreg failed in set_serial_baud");
1872 return -1;
1873 }
1874 /* Calculate the Divisor */
1875
1876 if (status) {
1877 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1878 return status;
1879 }
1880 /* Enable access to divisor latch */
1881 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1882 mos7840_port->shadowLCR = Data;
1883 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1884
1885 /* Write the divisor */
1886 Data = (unsigned char)(divisor & 0xff);
1887 dbg("set_serial_baud Value to write DLL is %x", Data);
1888 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1889
1890 Data = (unsigned char)((divisor & 0xff00) >> 8);
1891 dbg("set_serial_baud Value to write DLM is %x", Data);
1892 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1893
1894 /* Disable access to divisor latch */
1895 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1896 mos7840_port->shadowLCR = Data;
1897 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1898
1899 }
1900 return status;
1901}
1902
1903/*****************************************************************************
1904 * mos7840_change_port_settings
1905 * This routine is called to set the UART on the device to match
1906 * the specified new settings.
1907 *****************************************************************************/
1908
1909static void mos7840_change_port_settings(struct tty_struct *tty,
1910 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1911{
1912 int baud;
1913 unsigned cflag;
1914 unsigned iflag;
1915 __u8 lData;
1916 __u8 lParity;
1917 __u8 lStop;
1918 int status;
1919 __u16 Data;
1920 struct usb_serial_port *port;
1921 struct usb_serial *serial;
1922
1923 if (mos7840_port == NULL)
1924 return;
1925
1926 port = (struct usb_serial_port *)mos7840_port->port;
1927
1928 if (mos7840_port_paranoia_check(port, __func__)) {
1929 dbg("%s", "Invalid port");
1930 return;
1931 }
1932
1933 if (mos7840_serial_paranoia_check(port->serial, __func__)) {
1934 dbg("%s", "Invalid Serial");
1935 return;
1936 }
1937
1938 serial = port->serial;
1939
1940 dbg("%s - port %d", __func__, mos7840_port->port->number);
1941
1942 if (!mos7840_port->open) {
1943 dbg("%s - port not opened", __func__);
1944 return;
1945 }
1946
1947 dbg("%s", "Entering ..........");
1948
1949 lData = LCR_BITS_8;
1950 lStop = LCR_STOP_1;
1951 lParity = LCR_PAR_NONE;
1952
1953 cflag = tty->termios->c_cflag;
1954 iflag = tty->termios->c_iflag;
1955
1956 /* Change the number of bits */
1957 if (cflag & CSIZE) {
1958 switch (cflag & CSIZE) {
1959 case CS5:
1960 lData = LCR_BITS_5;
1961 break;
1962
1963 case CS6:
1964 lData = LCR_BITS_6;
1965 break;
1966
1967 case CS7:
1968 lData = LCR_BITS_7;
1969 break;
1970 default:
1971 case CS8:
1972 lData = LCR_BITS_8;
1973 break;
1974 }
1975 }
1976 /* Change the Parity bit */
1977 if (cflag & PARENB) {
1978 if (cflag & PARODD) {
1979 lParity = LCR_PAR_ODD;
1980 dbg("%s - parity = odd", __func__);
1981 } else {
1982 lParity = LCR_PAR_EVEN;
1983 dbg("%s - parity = even", __func__);
1984 }
1985
1986 } else {
1987 dbg("%s - parity = none", __func__);
1988 }
1989
1990 if (cflag & CMSPAR)
1991 lParity = lParity | 0x20;
1992
1993 /* Change the Stop bit */
1994 if (cflag & CSTOPB) {
1995 lStop = LCR_STOP_2;
1996 dbg("%s - stop bits = 2", __func__);
1997 } else {
1998 lStop = LCR_STOP_1;
1999 dbg("%s - stop bits = 1", __func__);
2000 }
2001
2002 /* Update the LCR with the correct value */
2003 mos7840_port->shadowLCR &=
2004 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
2005 mos7840_port->shadowLCR |= (lData | lParity | lStop);
2006
2007 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is %x",
2008 mos7840_port->shadowLCR);
2009 /* Disable Interrupts */
2010 Data = 0x00;
2011 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2012
2013 Data = 0x00;
2014 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2015
2016 Data = 0xcf;
2017 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
2018
2019 /* Send the updated LCR value to the mos7840 */
2020 Data = mos7840_port->shadowLCR;
2021
2022 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
2023
2024 Data = 0x00b;
2025 mos7840_port->shadowMCR = Data;
2026 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2027 Data = 0x00b;
2028 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2029
2030 /* set up the MCR register and send it to the mos7840 */
2031
2032 mos7840_port->shadowMCR = MCR_MASTER_IE;
2033 if (cflag & CBAUD)
2034 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
2035
2036 if (cflag & CRTSCTS)
2037 mos7840_port->shadowMCR |= (MCR_XON_ANY);
2038 else
2039 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
2040
2041 Data = mos7840_port->shadowMCR;
2042 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
2043
2044 /* Determine divisor based on baud rate */
2045 baud = tty_get_baud_rate(tty);
2046
2047 if (!baud) {
2048 /* pick a default, any default... */
2049 dbg("%s", "Picked default baud...");
2050 baud = 9600;
2051 }
2052
2053 dbg("%s - baud rate = %d", __func__, baud);
2054 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
2055
2056 /* Enable Interrupts */
2057 Data = 0x0c;
2058 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
2059
2060 if (mos7840_port->read_urb_busy == false) {
2061 mos7840_port->read_urb->dev = serial->dev;
2062 mos7840_port->read_urb_busy = true;
2063 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2064 if (status) {
2065 dbg("usb_submit_urb(read bulk) failed, status = %d",
2066 status);
2067 mos7840_port->read_urb_busy = false;
2068 }
2069 }
2070 wake_up(&mos7840_port->delta_msr_wait);
2071 mos7840_port->delta_msr_cond = 1;
2072 dbg("mos7840_change_port_settings mos7840_port->shadowLCR is End %x",
2073 mos7840_port->shadowLCR);
2074}
2075
2076/*****************************************************************************
2077 * mos7840_set_termios
2078 * this function is called by the tty driver when it wants to change
2079 * the termios structure
2080 *****************************************************************************/
2081
2082static void mos7840_set_termios(struct tty_struct *tty,
2083 struct usb_serial_port *port,
2084 struct ktermios *old_termios)
2085{
2086 int status;
2087 unsigned int cflag;
2088 struct usb_serial *serial;
2089 struct moschip_port *mos7840_port;
2090 dbg("mos7840_set_termios: START");
2091 if (mos7840_port_paranoia_check(port, __func__)) {
2092 dbg("%s", "Invalid port");
2093 return;
2094 }
2095
2096 serial = port->serial;
2097
2098 if (mos7840_serial_paranoia_check(serial, __func__)) {
2099 dbg("%s", "Invalid Serial");
2100 return;
2101 }
2102
2103 mos7840_port = mos7840_get_port_private(port);
2104
2105 if (mos7840_port == NULL)
2106 return;
2107
2108 if (!mos7840_port->open) {
2109 dbg("%s - port not opened", __func__);
2110 return;
2111 }
2112
2113 dbg("%s", "setting termios - ");
2114
2115 cflag = tty->termios->c_cflag;
2116
2117 dbg("%s - clfag %08x iflag %08x", __func__,
2118 tty->termios->c_cflag, RELEVANT_IFLAG(tty->termios->c_iflag));
2119 dbg("%s - old clfag %08x old iflag %08x", __func__,
2120 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
2121 dbg("%s - port %d", __func__, port->number);
2122
2123 /* change the port settings to the new ones specified */
2124
2125 mos7840_change_port_settings(tty, mos7840_port, old_termios);
2126
2127 if (!mos7840_port->read_urb) {
2128 dbg("%s", "URB KILLED !!!!!");
2129 return;
2130 }
2131
2132 if (mos7840_port->read_urb_busy == false) {
2133 mos7840_port->read_urb->dev = serial->dev;
2134 mos7840_port->read_urb_busy = true;
2135 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
2136 if (status) {
2137 dbg("usb_submit_urb(read bulk) failed, status = %d",
2138 status);
2139 mos7840_port->read_urb_busy = false;
2140 }
2141 }
2142}
2143
2144/*****************************************************************************
2145 * mos7840_get_lsr_info - get line status register info
2146 *
2147 * Purpose: Let user call ioctl() to get info when the UART physically
2148 * is emptied. On bus types like RS485, the transmitter must
2149 * release the bus after transmitting. This must be done when
2150 * the transmit shift register is empty, not be done when the
2151 * transmit holding register is empty. This functionality
2152 * allows an RS485 driver to be written in user space.
2153 *****************************************************************************/
2154
2155static int mos7840_get_lsr_info(struct tty_struct *tty,
2156 unsigned int __user *value)
2157{
2158 int count;
2159 unsigned int result = 0;
2160
2161 count = mos7840_chars_in_buffer(tty);
2162 if (count == 0) {
2163 dbg("%s -- Empty", __func__);
2164 result = TIOCSER_TEMT;
2165 }
2166
2167 if (copy_to_user(value, &result, sizeof(int)))
2168 return -EFAULT;
2169 return 0;
2170}
2171
2172/*****************************************************************************
2173 * mos7840_get_serial_info
2174 * function to get information about serial port
2175 *****************************************************************************/
2176
2177static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2178 struct serial_struct __user *retinfo)
2179{
2180 struct serial_struct tmp;
2181
2182 if (mos7840_port == NULL)
2183 return -1;
2184
2185 if (!retinfo)
2186 return -EFAULT;
2187
2188 memset(&tmp, 0, sizeof(tmp));
2189
2190 tmp.type = PORT_16550A;
2191 tmp.line = mos7840_port->port->serial->minor;
2192 tmp.port = mos7840_port->port->number;
2193 tmp.irq = 0;
2194 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2195 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2196 tmp.baud_base = 9600;
2197 tmp.close_delay = 5 * HZ;
2198 tmp.closing_wait = 30 * HZ;
2199
2200 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2201 return -EFAULT;
2202 return 0;
2203}
2204
2205static int mos7840_get_icount(struct tty_struct *tty,
2206 struct serial_icounter_struct *icount)
2207{
2208 struct usb_serial_port *port = tty->driver_data;
2209 struct moschip_port *mos7840_port;
2210 struct async_icount cnow;
2211
2212 mos7840_port = mos7840_get_port_private(port);
2213 cnow = mos7840_port->icount;
2214
2215 smp_rmb();
2216 icount->cts = cnow.cts;
2217 icount->dsr = cnow.dsr;
2218 icount->rng = cnow.rng;
2219 icount->dcd = cnow.dcd;
2220 icount->rx = cnow.rx;
2221 icount->tx = cnow.tx;
2222 icount->frame = cnow.frame;
2223 icount->overrun = cnow.overrun;
2224 icount->parity = cnow.parity;
2225 icount->brk = cnow.brk;
2226 icount->buf_overrun = cnow.buf_overrun;
2227
2228 dbg("%s (%d) TIOCGICOUNT RX=%d, TX=%d", __func__,
2229 port->number, icount->rx, icount->tx);
2230 return 0;
2231}
2232
2233/*****************************************************************************
2234 * SerialIoctl
2235 * this function handles any ioctl calls to the driver
2236 *****************************************************************************/
2237
2238static int mos7840_ioctl(struct tty_struct *tty,
2239 unsigned int cmd, unsigned long arg)
2240{
2241 struct usb_serial_port *port = tty->driver_data;
2242 void __user *argp = (void __user *)arg;
2243 struct moschip_port *mos7840_port;
2244
2245 struct async_icount cnow;
2246 struct async_icount cprev;
2247
2248 if (mos7840_port_paranoia_check(port, __func__)) {
2249 dbg("%s", "Invalid port");
2250 return -1;
2251 }
2252
2253 mos7840_port = mos7840_get_port_private(port);
2254
2255 if (mos7840_port == NULL)
2256 return -1;
2257
2258 dbg("%s - port %d, cmd = 0x%x", __func__, port->number, cmd);
2259
2260 switch (cmd) {
2261 /* return number of bytes available */
2262
2263 case TIOCSERGETLSR:
2264 dbg("%s (%d) TIOCSERGETLSR", __func__, port->number);
2265 return mos7840_get_lsr_info(tty, argp);
2266 return 0;
2267
2268 case TIOCGSERIAL:
2269 dbg("%s (%d) TIOCGSERIAL", __func__, port->number);
2270 return mos7840_get_serial_info(mos7840_port, argp);
2271
2272 case TIOCSSERIAL:
2273 dbg("%s (%d) TIOCSSERIAL", __func__, port->number);
2274 break;
2275
2276 case TIOCMIWAIT:
2277 dbg("%s (%d) TIOCMIWAIT", __func__, port->number);
2278 cprev = mos7840_port->icount;
2279 while (1) {
2280 /* interruptible_sleep_on(&mos7840_port->delta_msr_wait); */
2281 mos7840_port->delta_msr_cond = 0;
2282 wait_event_interruptible(mos7840_port->delta_msr_wait,
2283 (mos7840_port->
2284 delta_msr_cond == 1));
2285
2286 /* see if a signal did it */
2287 if (signal_pending(current))
2288 return -ERESTARTSYS;
2289 cnow = mos7840_port->icount;
2290 smp_rmb();
2291 if (cnow.rng == cprev.rng && cnow.dsr == cprev.dsr &&
2292 cnow.dcd == cprev.dcd && cnow.cts == cprev.cts)
2293 return -EIO; /* no change => error */
2294 if (((arg & TIOCM_RNG) && (cnow.rng != cprev.rng)) ||
2295 ((arg & TIOCM_DSR) && (cnow.dsr != cprev.dsr)) ||
2296 ((arg & TIOCM_CD) && (cnow.dcd != cprev.dcd)) ||
2297 ((arg & TIOCM_CTS) && (cnow.cts != cprev.cts))) {
2298 return 0;
2299 }
2300 cprev = cnow;
2301 }
2302 /* NOTREACHED */
2303 break;
2304
2305 default:
2306 break;
2307 }
2308 return -ENOIOCTLCMD;
2309}
2310
2311static int mos7840_calc_num_ports(struct usb_serial *serial)
2312{
2313 int mos7840_num_ports = 0;
2314
2315 dbg("numberofendpoints: cur %d, alt %d",
2316 (int)serial->interface->cur_altsetting->desc.bNumEndpoints,
2317 (int)serial->interface->altsetting->desc.bNumEndpoints);
2318 if (serial->interface->cur_altsetting->desc.bNumEndpoints == 5) {
2319 mos7840_num_ports = serial->num_ports = 2;
2320 } else if (serial->interface->cur_altsetting->desc.bNumEndpoints == 9) {
2321 serial->num_bulk_in = 4;
2322 serial->num_bulk_out = 4;
2323 mos7840_num_ports = serial->num_ports = 4;
2324 }
2325 dbg ("mos7840_num_ports = %d", mos7840_num_ports);
2326 return mos7840_num_ports;
2327}
2328
2329/****************************************************************************
2330 * mos7840_startup
2331 ****************************************************************************/
2332
2333static int mos7840_startup(struct usb_serial *serial)
2334{
2335 struct moschip_port *mos7840_port;
2336 struct usb_device *dev;
2337 int i, status;
2338
2339 __u16 Data;
2340 dbg("%s", "mos7840_startup :Entering..........");
2341
2342 if (!serial) {
2343 dbg("%s", "Invalid Handler");
2344 return -1;
2345 }
2346
2347 dev = serial->dev;
2348
2349 dbg("%s", "Entering...");
2350 dbg ("mos7840_startup: serial = %p", serial);
2351
2352 /* we set up the pointers to the endpoints in the mos7840_open *
2353 * function, as the structures aren't created yet. */
2354
2355 /* set up port private structures */
2356 for (i = 0; i < serial->num_ports; ++i) {
2357 dbg ("mos7840_startup: configuring port %d............", i);
2358 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2359 if (mos7840_port == NULL) {
2360 dev_err(&dev->dev, "%s - Out of memory\n", __func__);
2361 status = -ENOMEM;
2362 i--; /* don't follow NULL pointer cleaning up */
2363 goto error;
2364 }
2365
2366 /* Initialize all port interrupt end point to port 0 int
2367 * endpoint. Our device has only one interrupt end point
2368 * common to all port */
2369
2370 mos7840_port->port = serial->port[i];
2371 mos7840_set_port_private(serial->port[i], mos7840_port);
2372 spin_lock_init(&mos7840_port->pool_lock);
2373
2374 /* minor is not initialised until later by
2375 * usb-serial.c:get_free_serial() and cannot therefore be used
2376 * to index device instances */
2377 mos7840_port->port_num = i + 1;
2378 dbg ("serial->port[i]->number = %d", serial->port[i]->number);
2379 dbg ("serial->port[i]->serial->minor = %d", serial->port[i]->serial->minor);
2380 dbg ("mos7840_port->port_num = %d", mos7840_port->port_num);
2381 dbg ("serial->minor = %d", serial->minor);
2382
2383 if (mos7840_port->port_num == 1) {
2384 mos7840_port->SpRegOffset = 0x0;
2385 mos7840_port->ControlRegOffset = 0x1;
2386 mos7840_port->DcrRegOffset = 0x4;
2387 } else if ((mos7840_port->port_num == 2)
2388 && (serial->num_ports == 4)) {
2389 mos7840_port->SpRegOffset = 0x8;
2390 mos7840_port->ControlRegOffset = 0x9;
2391 mos7840_port->DcrRegOffset = 0x16;
2392 } else if ((mos7840_port->port_num == 2)
2393 && (serial->num_ports == 2)) {
2394 mos7840_port->SpRegOffset = 0xa;
2395 mos7840_port->ControlRegOffset = 0xb;
2396 mos7840_port->DcrRegOffset = 0x19;
2397 } else if ((mos7840_port->port_num == 3)
2398 && (serial->num_ports == 4)) {
2399 mos7840_port->SpRegOffset = 0xa;
2400 mos7840_port->ControlRegOffset = 0xb;
2401 mos7840_port->DcrRegOffset = 0x19;
2402 } else if ((mos7840_port->port_num == 4)
2403 && (serial->num_ports == 4)) {
2404 mos7840_port->SpRegOffset = 0xc;
2405 mos7840_port->ControlRegOffset = 0xd;
2406 mos7840_port->DcrRegOffset = 0x1c;
2407 }
2408 mos7840_dump_serial_port(mos7840_port);
2409 mos7840_set_port_private(serial->port[i], mos7840_port);
2410
2411 /* enable rx_disable bit in control register */
2412 status = mos7840_get_reg_sync(serial->port[i],
2413 mos7840_port->ControlRegOffset, &Data);
2414 if (status < 0) {
2415 dbg("Reading ControlReg failed status-0x%x", status);
2416 break;
2417 } else
2418 dbg("ControlReg Reading success val is %x, status%d",
2419 Data, status);
2420 Data |= 0x08; /* setting driver done bit */
2421 Data |= 0x04; /* sp1_bit to have cts change reflect in
2422 modem status reg */
2423
2424 /* Data |= 0x20; //rx_disable bit */
2425 status = mos7840_set_reg_sync(serial->port[i],
2426 mos7840_port->ControlRegOffset, Data);
2427 if (status < 0) {
2428 dbg("Writing ControlReg failed(rx_disable) status-0x%x", status);
2429 break;
2430 } else
2431 dbg("ControlReg Writing success(rx_disable) status%d",
2432 status);
2433
2434 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2435 and 0x24 in DCR3 */
2436 Data = 0x01;
2437 status = mos7840_set_reg_sync(serial->port[i],
2438 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2439 if (status < 0) {
2440 dbg("Writing DCR0 failed status-0x%x", status);
2441 break;
2442 } else
2443 dbg("DCR0 Writing success status%d", status);
2444
2445 Data = 0x05;
2446 status = mos7840_set_reg_sync(serial->port[i],
2447 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2448 if (status < 0) {
2449 dbg("Writing DCR1 failed status-0x%x", status);
2450 break;
2451 } else
2452 dbg("DCR1 Writing success status%d", status);
2453
2454 Data = 0x24;
2455 status = mos7840_set_reg_sync(serial->port[i],
2456 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2457 if (status < 0) {
2458 dbg("Writing DCR2 failed status-0x%x", status);
2459 break;
2460 } else
2461 dbg("DCR2 Writing success status%d", status);
2462
2463 /* write values in clkstart0x0 and clkmulti 0x20 */
2464 Data = 0x0;
2465 status = mos7840_set_reg_sync(serial->port[i],
2466 CLK_START_VALUE_REGISTER, Data);
2467 if (status < 0) {
2468 dbg("Writing CLK_START_VALUE_REGISTER failed status-0x%x", status);
2469 break;
2470 } else
2471 dbg("CLK_START_VALUE_REGISTER Writing success status%d", status);
2472
2473 Data = 0x20;
2474 status = mos7840_set_reg_sync(serial->port[i],
2475 CLK_MULTI_REGISTER, Data);
2476 if (status < 0) {
2477 dbg("Writing CLK_MULTI_REGISTER failed status-0x%x",
2478 status);
2479 goto error;
2480 } else
2481 dbg("CLK_MULTI_REGISTER Writing success status%d",
2482 status);
2483
2484 /* write value 0x0 to scratchpad register */
2485 Data = 0x00;
2486 status = mos7840_set_uart_reg(serial->port[i],
2487 SCRATCH_PAD_REGISTER, Data);
2488 if (status < 0) {
2489 dbg("Writing SCRATCH_PAD_REGISTER failed status-0x%x",
2490 status);
2491 break;
2492 } else
2493 dbg("SCRATCH_PAD_REGISTER Writing success status%d",
2494 status);
2495
2496 /* Zero Length flag register */
2497 if ((mos7840_port->port_num != 1)
2498 && (serial->num_ports == 2)) {
2499
2500 Data = 0xff;
2501 status = mos7840_set_reg_sync(serial->port[i],
2502 (__u16) (ZLP_REG1 +
2503 ((__u16)mos7840_port->port_num)), Data);
2504 dbg("ZLIP offset %x",
2505 (__u16) (ZLP_REG1 +
2506 ((__u16) mos7840_port->port_num)));
2507 if (status < 0) {
2508 dbg("Writing ZLP_REG%d failed status-0x%x",
2509 i + 2, status);
2510 break;
2511 } else
2512 dbg("ZLP_REG%d Writing success status%d",
2513 i + 2, status);
2514 } else {
2515 Data = 0xff;
2516 status = mos7840_set_reg_sync(serial->port[i],
2517 (__u16) (ZLP_REG1 +
2518 ((__u16)mos7840_port->port_num) - 0x1), Data);
2519 dbg("ZLIP offset %x",
2520 (__u16) (ZLP_REG1 +
2521 ((__u16) mos7840_port->port_num) - 0x1));
2522 if (status < 0) {
2523 dbg("Writing ZLP_REG%d failed status-0x%x",
2524 i + 1, status);
2525 break;
2526 } else
2527 dbg("ZLP_REG%d Writing success status%d",
2528 i + 1, status);
2529
2530 }
2531 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2532 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2533 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2534 GFP_KERNEL);
2535 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2536 !mos7840_port->dr) {
2537 status = -ENOMEM;
2538 goto error;
2539 }
2540 }
2541 dbg ("mos7840_startup: all ports configured...........");
2542
2543 /* Zero Length flag enable */
2544 Data = 0x0f;
2545 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2546 if (status < 0) {
2547 dbg("Writing ZLP_REG5 failed status-0x%x", status);
2548 goto error;
2549 } else
2550 dbg("ZLP_REG5 Writing success status%d", status);
2551
2552 /* setting configuration feature to one */
2553 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2554 (__u8) 0x03, 0x00, 0x01, 0x00, NULL, 0x00, 5 * HZ);
2555 return 0;
2556error:
2557 for (/* nothing */; i >= 0; i--) {
2558 mos7840_port = mos7840_get_port_private(serial->port[i]);
2559
2560 kfree(mos7840_port->dr);
2561 kfree(mos7840_port->ctrl_buf);
2562 usb_free_urb(mos7840_port->control_urb);
2563 kfree(mos7840_port);
2564 serial->port[i] = NULL;
2565 }
2566 return status;
2567}
2568
2569/****************************************************************************
2570 * mos7840_disconnect
2571 * This function is called whenever the device is removed from the usb bus.
2572 ****************************************************************************/
2573
2574static void mos7840_disconnect(struct usb_serial *serial)
2575{
2576 int i;
2577 unsigned long flags;
2578 struct moschip_port *mos7840_port;
2579 dbg("%s", " disconnect :entering..........");
2580
2581 if (!serial) {
2582 dbg("%s", "Invalid Handler");
2583 return;
2584 }
2585
2586 /* check for the ports to be closed,close the ports and disconnect */
2587
2588 /* free private structure allocated for serial port *
2589 * stop reads and writes on all ports */
2590
2591 for (i = 0; i < serial->num_ports; ++i) {
2592 mos7840_port = mos7840_get_port_private(serial->port[i]);
2593 dbg ("mos7840_port %d = %p", i, mos7840_port);
2594 if (mos7840_port) {
2595 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
2596 mos7840_port->zombie = 1;
2597 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
2598 usb_kill_urb(mos7840_port->control_urb);
2599 }
2600 }
2601
2602 dbg("%s", "Thank u :: ");
2603
2604}
2605
2606/****************************************************************************
2607 * mos7840_release
2608 * This function is called when the usb_serial structure is freed.
2609 ****************************************************************************/
2610
2611static void mos7840_release(struct usb_serial *serial)
2612{
2613 int i;
2614 struct moschip_port *mos7840_port;
2615 dbg("%s", " release :entering..........");
2616
2617 if (!serial) {
2618 dbg("%s", "Invalid Handler");
2619 return;
2620 }
2621
2622 /* check for the ports to be closed,close the ports and disconnect */
2623
2624 /* free private structure allocated for serial port *
2625 * stop reads and writes on all ports */
2626
2627 for (i = 0; i < serial->num_ports; ++i) {
2628 mos7840_port = mos7840_get_port_private(serial->port[i]);
2629 dbg("mos7840_port %d = %p", i, mos7840_port);
2630 if (mos7840_port) {
2631 kfree(mos7840_port->ctrl_buf);
2632 kfree(mos7840_port->dr);
2633 kfree(mos7840_port);
2634 }
2635 }
2636
2637 dbg("%s", "Thank u :: ");
2638
2639}
2640
2641static struct usb_driver io_driver = {
2642 .name = "mos7840",
2643 .probe = usb_serial_probe,
2644 .disconnect = usb_serial_disconnect,
2645 .id_table = moschip_id_table_combined,
2646 .no_dynamic_id = 1,
2647};
2648
2649static struct usb_serial_driver moschip7840_4port_device = {
2650 .driver = {
2651 .owner = THIS_MODULE,
2652 .name = "mos7840",
2653 },
2654 .description = DRIVER_DESC,
2655 .usb_driver = &io_driver,
2656 .id_table = moschip_port_id_table,
2657 .num_ports = 4,
2658 .open = mos7840_open,
2659 .close = mos7840_close,
2660 .write = mos7840_write,
2661 .write_room = mos7840_write_room,
2662 .chars_in_buffer = mos7840_chars_in_buffer,
2663 .throttle = mos7840_throttle,
2664 .unthrottle = mos7840_unthrottle,
2665 .calc_num_ports = mos7840_calc_num_ports,
2666#ifdef MCSSerialProbe
2667 .probe = mos7840_serial_probe,
2668#endif
2669 .ioctl = mos7840_ioctl,
2670 .set_termios = mos7840_set_termios,
2671 .break_ctl = mos7840_break,
2672 .tiocmget = mos7840_tiocmget,
2673 .tiocmset = mos7840_tiocmset,
2674 .get_icount = mos7840_get_icount,
2675 .attach = mos7840_startup,
2676 .disconnect = mos7840_disconnect,
2677 .release = mos7840_release,
2678 .read_bulk_callback = mos7840_bulk_in_callback,
2679 .read_int_callback = mos7840_interrupt_callback,
2680};
2681
2682/****************************************************************************
2683 * moschip7840_init
2684 * This is called by the module subsystem, or on startup to initialize us
2685 ****************************************************************************/
2686static int __init moschip7840_init(void)
2687{
2688 int retval;
2689
2690 dbg("%s", " mos7840_init :entering..........");
2691
2692 /* Register with the usb serial */
2693 retval = usb_serial_register(&moschip7840_4port_device);
2694
2695 if (retval)
2696 goto failed_port_device_register;
2697
2698 dbg("%s", "Entering...");
2699 printk(KERN_INFO KBUILD_MODNAME ": " DRIVER_VERSION ":"
2700 DRIVER_DESC "\n");
2701
2702 /* Register with the usb */
2703 retval = usb_register(&io_driver);
2704 if (retval == 0) {
2705 dbg("%s", "Leaving...");
2706 return 0;
2707 }
2708 usb_serial_deregister(&moschip7840_4port_device);
2709failed_port_device_register:
2710 return retval;
2711}
2712
2713/****************************************************************************
2714 * moschip7840_exit
2715 * Called when the driver is about to be unloaded.
2716 ****************************************************************************/
2717static void __exit moschip7840_exit(void)
2718{
2719
2720 dbg("%s", " mos7840_exit :entering..........");
2721
2722 usb_deregister(&io_driver);
2723
2724 usb_serial_deregister(&moschip7840_4port_device);
2725
2726 dbg("%s", "Entering...");
2727}
2728
2729module_init(moschip7840_init);
2730module_exit(moschip7840_exit);
2731
2732/* Module information */
2733MODULE_DESCRIPTION(DRIVER_DESC);
2734MODULE_LICENSE("GPL");
2735
2736module_param(debug, bool, S_IRUGO | S_IWUSR);
2737MODULE_PARM_DESC(debug, "Debug enabled or not");