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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
111/* Interrupt Routine Defines */
112
113#define SERIAL_IIR_RLS 0x06
114#define SERIAL_IIR_MS 0x00
115
116/*
117 * Emulation of the bit mask on the LINE STATUS REGISTER.
118 */
119#define SERIAL_LSR_DR 0x0001
120#define SERIAL_LSR_OE 0x0002
121#define SERIAL_LSR_PE 0x0004
122#define SERIAL_LSR_FE 0x0008
123#define SERIAL_LSR_BI 0x0010
124
125#define MOS_MSR_DELTA_CTS 0x10
126#define MOS_MSR_DELTA_DSR 0x20
127#define MOS_MSR_DELTA_RI 0x40
128#define MOS_MSR_DELTA_CD 0x80
129
130/* Serial Port register Address */
131#define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
132#define FIFO_CONTROL_REGISTER ((__u16)(0x02))
133#define LINE_CONTROL_REGISTER ((__u16)(0x03))
134#define MODEM_CONTROL_REGISTER ((__u16)(0x04))
135#define LINE_STATUS_REGISTER ((__u16)(0x05))
136#define MODEM_STATUS_REGISTER ((__u16)(0x06))
137#define SCRATCH_PAD_REGISTER ((__u16)(0x07))
138#define DIVISOR_LATCH_LSB ((__u16)(0x00))
139#define DIVISOR_LATCH_MSB ((__u16)(0x01))
140
141#define CLK_MULTI_REGISTER ((__u16)(0x02))
142#define CLK_START_VALUE_REGISTER ((__u16)(0x03))
143#define GPIO_REGISTER ((__u16)(0x07))
144
145#define SERIAL_LCR_DLAB ((__u16)(0x0080))
146
147/*
148 * URB POOL related defines
149 */
150#define NUM_URBS 16 /* URB Count */
151#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
152
153/* LED on/off milliseconds*/
154#define LED_ON_MS 500
155#define LED_OFF_MS 500
156
157enum mos7840_flag {
158 MOS7840_FLAG_LED_BUSY,
159};
160
161#define MCS_PORT_MASK GENMASK(2, 0)
162#define MCS_PORTS(nr) ((nr) & MCS_PORT_MASK)
163#define MCS_LED BIT(3)
164
165#define MCS_DEVICE(vid, pid, flags) \
166 USB_DEVICE((vid), (pid)), .driver_info = (flags)
167
168static const struct usb_device_id id_table[] = {
169 { MCS_DEVICE(0x0557, 0x2011, MCS_PORTS(4)) }, /* ATEN UC2324 */
170 { MCS_DEVICE(0x0557, 0x7820, MCS_PORTS(2)) }, /* ATEN UC2322 */
171 { MCS_DEVICE(0x110a, 0x2210, MCS_PORTS(2)) }, /* Moxa UPort 2210 */
172 { MCS_DEVICE(0x9710, 0x7810, MCS_PORTS(1) | MCS_LED) }, /* ASIX MCS7810 */
173 { MCS_DEVICE(0x9710, 0x7820, MCS_PORTS(2)) }, /* MosChip MCS7820 */
174 { MCS_DEVICE(0x9710, 0x7840, MCS_PORTS(4)) }, /* MosChip MCS7840 */
175 { MCS_DEVICE(0x9710, 0x7843, MCS_PORTS(3)) }, /* ASIX MCS7840 3 port */
176 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2) },
177 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P) },
178 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4) },
179 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P) },
180 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2) },
181 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4) },
182 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2) },
183 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4) },
184 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2) },
185 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P) },
186 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4) },
187 { USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P) },
188 {} /* terminating entry */
189};
190MODULE_DEVICE_TABLE(usb, id_table);
191
192/* This structure holds all of the local port information */
193
194struct moschip_port {
195 int port_num; /*Actual port number in the device(1,2,etc) */
196 struct urb *read_urb; /* read URB for this port */
197 __u8 shadowLCR; /* last LCR value received */
198 __u8 shadowMCR; /* last MCR value received */
199 struct usb_serial_port *port; /* loop back to the owner of this object */
200
201 /* Offsets */
202 __u8 SpRegOffset;
203 __u8 ControlRegOffset;
204 __u8 DcrRegOffset;
205
206 spinlock_t pool_lock;
207 struct urb *write_urb_pool[NUM_URBS];
208 char busy[NUM_URBS];
209 bool read_urb_busy;
210
211 /* For device(s) with LED indicator */
212 bool has_led;
213 struct timer_list led_timer1; /* Timer for LED on */
214 struct timer_list led_timer2; /* Timer for LED off */
215 struct urb *led_urb;
216 struct usb_ctrlrequest *led_dr;
217
218 unsigned long flags;
219};
220
221/*
222 * mos7840_set_reg_sync
223 * To set the Control register by calling usb_fill_control_urb function
224 * by passing usb_sndctrlpipe function as parameter.
225 */
226
227static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
228 __u16 val)
229{
230 struct usb_device *dev = port->serial->dev;
231 val = val & 0x00ff;
232 dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
233
234 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
235 MCS_WR_RTYPE, val, reg, NULL, 0,
236 MOS_WDR_TIMEOUT);
237}
238
239/*
240 * mos7840_get_reg_sync
241 * To set the Uart register by calling usb_fill_control_urb function by
242 * passing usb_rcvctrlpipe function as parameter.
243 */
244
245static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
246 __u16 *val)
247{
248 struct usb_device *dev = port->serial->dev;
249 int ret = 0;
250 u8 *buf;
251
252 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
253 if (!buf)
254 return -ENOMEM;
255
256 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
257 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
258 MOS_WDR_TIMEOUT);
259 if (ret < VENDOR_READ_LENGTH) {
260 if (ret >= 0)
261 ret = -EIO;
262 goto out;
263 }
264
265 *val = buf[0];
266 dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
267out:
268 kfree(buf);
269 return ret;
270}
271
272/*
273 * mos7840_set_uart_reg
274 * To set the Uart register by calling usb_fill_control_urb function by
275 * passing usb_sndctrlpipe function as parameter.
276 */
277
278static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
279 __u16 val)
280{
281
282 struct usb_device *dev = port->serial->dev;
283 val = val & 0x00ff;
284 /* For the UART control registers, the application number need
285 to be Or'ed */
286 if (port->serial->num_ports == 2 && port->port_number != 0)
287 val |= ((__u16)port->port_number + 2) << 8;
288 else
289 val |= ((__u16)port->port_number + 1) << 8;
290 dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
291 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
292 MCS_WR_RTYPE, val, reg, NULL, 0,
293 MOS_WDR_TIMEOUT);
294
295}
296
297/*
298 * mos7840_get_uart_reg
299 * To set the Control register by calling usb_fill_control_urb function
300 * by passing usb_rcvctrlpipe function as parameter.
301 */
302static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
303 __u16 *val)
304{
305 struct usb_device *dev = port->serial->dev;
306 int ret = 0;
307 __u16 Wval;
308 u8 *buf;
309
310 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
311 if (!buf)
312 return -ENOMEM;
313
314 /* Wval is same as application number */
315 if (port->serial->num_ports == 2 && port->port_number != 0)
316 Wval = ((__u16)port->port_number + 2) << 8;
317 else
318 Wval = ((__u16)port->port_number + 1) << 8;
319 dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
320 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
321 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
322 MOS_WDR_TIMEOUT);
323 if (ret < VENDOR_READ_LENGTH) {
324 if (ret >= 0)
325 ret = -EIO;
326 goto out;
327 }
328 *val = buf[0];
329out:
330 kfree(buf);
331 return ret;
332}
333
334static void mos7840_dump_serial_port(struct usb_serial_port *port,
335 struct moschip_port *mos7840_port)
336{
337
338 dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
339 dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
340 dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
341
342}
343
344/************************************************************************/
345/************************************************************************/
346/* U S B C A L L B A C K F U N C T I O N S */
347/* U S B C A L L B A C K F U N C T I O N S */
348/************************************************************************/
349/************************************************************************/
350
351static void mos7840_set_led_callback(struct urb *urb)
352{
353 switch (urb->status) {
354 case 0:
355 /* Success */
356 break;
357 case -ECONNRESET:
358 case -ENOENT:
359 case -ESHUTDOWN:
360 /* This urb is terminated, clean up */
361 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
362 __func__, urb->status);
363 break;
364 default:
365 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
366 __func__, urb->status);
367 }
368}
369
370static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
371 __u16 reg)
372{
373 struct usb_device *dev = mcs->port->serial->dev;
374 struct usb_ctrlrequest *dr = mcs->led_dr;
375
376 dr->bRequestType = MCS_WR_RTYPE;
377 dr->bRequest = MCS_WRREQ;
378 dr->wValue = cpu_to_le16(wval);
379 dr->wIndex = cpu_to_le16(reg);
380 dr->wLength = cpu_to_le16(0);
381
382 usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
383 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
384
385 usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
386}
387
388static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
389 __u16 val)
390{
391 struct usb_device *dev = port->serial->dev;
392
393 usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
394 val, reg, NULL, 0, MOS_WDR_TIMEOUT);
395}
396
397static void mos7840_led_off(struct timer_list *t)
398{
399 struct moschip_port *mcs = from_timer(mcs, t, led_timer1);
400
401 /* Turn off LED */
402 mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
403 mod_timer(&mcs->led_timer2,
404 jiffies + msecs_to_jiffies(LED_OFF_MS));
405}
406
407static void mos7840_led_flag_off(struct timer_list *t)
408{
409 struct moschip_port *mcs = from_timer(mcs, t, led_timer2);
410
411 clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
412}
413
414static void mos7840_led_activity(struct usb_serial_port *port)
415{
416 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
417
418 if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
419 return;
420
421 mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
422 mod_timer(&mos7840_port->led_timer1,
423 jiffies + msecs_to_jiffies(LED_ON_MS));
424}
425
426/*****************************************************************************
427 * mos7840_bulk_in_callback
428 * this is the callback function for when we have received data on the
429 * bulk in endpoint.
430 *****************************************************************************/
431
432static void mos7840_bulk_in_callback(struct urb *urb)
433{
434 struct moschip_port *mos7840_port = urb->context;
435 struct usb_serial_port *port = mos7840_port->port;
436 int retval;
437 unsigned char *data;
438 int status = urb->status;
439
440 if (status) {
441 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
442 mos7840_port->read_urb_busy = false;
443 return;
444 }
445
446 data = urb->transfer_buffer;
447 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
448
449 if (urb->actual_length) {
450 struct tty_port *tport = &mos7840_port->port->port;
451 tty_insert_flip_string(tport, data, urb->actual_length);
452 tty_flip_buffer_push(tport);
453 port->icount.rx += urb->actual_length;
454 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
455 }
456
457 if (mos7840_port->has_led)
458 mos7840_led_activity(port);
459
460 mos7840_port->read_urb_busy = true;
461 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
462
463 if (retval) {
464 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
465 mos7840_port->read_urb_busy = false;
466 }
467}
468
469/*****************************************************************************
470 * mos7840_bulk_out_data_callback
471 * this is the callback function for when we have finished sending
472 * serial data on the bulk out endpoint.
473 *****************************************************************************/
474
475static void mos7840_bulk_out_data_callback(struct urb *urb)
476{
477 struct moschip_port *mos7840_port = urb->context;
478 struct usb_serial_port *port = mos7840_port->port;
479 int status = urb->status;
480 unsigned long flags;
481 int i;
482
483 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
484 for (i = 0; i < NUM_URBS; i++) {
485 if (urb == mos7840_port->write_urb_pool[i]) {
486 mos7840_port->busy[i] = 0;
487 break;
488 }
489 }
490 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
491
492 if (status) {
493 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
494 return;
495 }
496
497 tty_port_tty_wakeup(&port->port);
498
499}
500
501/************************************************************************/
502/* 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 */
503/************************************************************************/
504
505/*****************************************************************************
506 * mos7840_open
507 * this function is called by the tty driver when a port is opened
508 * If successful, we return 0
509 * Otherwise we return a negative error number.
510 *****************************************************************************/
511
512static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
513{
514 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
515 struct usb_serial *serial = port->serial;
516 int response;
517 int j;
518 struct urb *urb;
519 __u16 Data;
520 int status;
521
522 usb_clear_halt(serial->dev, port->write_urb->pipe);
523 usb_clear_halt(serial->dev, port->read_urb->pipe);
524
525 /* Initialising the write urb pool */
526 for (j = 0; j < NUM_URBS; ++j) {
527 urb = usb_alloc_urb(0, GFP_KERNEL);
528 mos7840_port->write_urb_pool[j] = urb;
529 if (!urb)
530 continue;
531
532 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
533 GFP_KERNEL);
534 if (!urb->transfer_buffer) {
535 usb_free_urb(urb);
536 mos7840_port->write_urb_pool[j] = NULL;
537 continue;
538 }
539 }
540
541/*****************************************************************************
542 * Initialize MCS7840 -- Write Init values to corresponding Registers
543 *
544 * Register Index
545 * 1 : IER
546 * 2 : FCR
547 * 3 : LCR
548 * 4 : MCR
549 *
550 * 0x08 : SP1/2 Control Reg
551 *****************************************************************************/
552
553 /* NEED to check the following Block */
554
555 Data = 0x0;
556 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
557 if (status < 0) {
558 dev_dbg(&port->dev, "Reading Spreg failed\n");
559 goto err;
560 }
561 Data |= 0x80;
562 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
563 if (status < 0) {
564 dev_dbg(&port->dev, "writing Spreg failed\n");
565 goto err;
566 }
567
568 Data &= ~0x80;
569 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
570 if (status < 0) {
571 dev_dbg(&port->dev, "writing Spreg failed\n");
572 goto err;
573 }
574 /* End of block to be checked */
575
576 Data = 0x0;
577 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
578 &Data);
579 if (status < 0) {
580 dev_dbg(&port->dev, "Reading Controlreg failed\n");
581 goto err;
582 }
583 Data |= 0x08; /* Driver done bit */
584 Data |= 0x20; /* rx_disable */
585 status = mos7840_set_reg_sync(port,
586 mos7840_port->ControlRegOffset, Data);
587 if (status < 0) {
588 dev_dbg(&port->dev, "writing Controlreg failed\n");
589 goto err;
590 }
591 /* do register settings here */
592 /* Set all regs to the device default values. */
593 /***********************************
594 * First Disable all interrupts.
595 ***********************************/
596 Data = 0x00;
597 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
598 if (status < 0) {
599 dev_dbg(&port->dev, "disabling interrupts failed\n");
600 goto err;
601 }
602 /* Set FIFO_CONTROL_REGISTER to the default value */
603 Data = 0x00;
604 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
605 if (status < 0) {
606 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
607 goto err;
608 }
609
610 Data = 0xcf;
611 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
612 if (status < 0) {
613 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
614 goto err;
615 }
616
617 Data = 0x03;
618 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
619 mos7840_port->shadowLCR = Data;
620
621 Data = 0x0b;
622 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
623 mos7840_port->shadowMCR = Data;
624
625 Data = 0x00;
626 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
627 mos7840_port->shadowLCR = Data;
628
629 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
630 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
631
632 Data = 0x0c;
633 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
634
635 Data = 0x0;
636 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
637
638 Data = 0x00;
639 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
640
641 Data = Data & ~SERIAL_LCR_DLAB;
642 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
643 mos7840_port->shadowLCR = Data;
644
645 /* clearing Bulkin and Bulkout Fifo */
646 Data = 0x0;
647 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
648
649 Data = Data | 0x0c;
650 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
651
652 Data = Data & ~0x0c;
653 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
654 /* Finally enable all interrupts */
655 Data = 0x0c;
656 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
657
658 /* clearing rx_disable */
659 Data = 0x0;
660 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
661 &Data);
662 Data = Data & ~0x20;
663 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
664 Data);
665
666 /* rx_negate */
667 Data = 0x0;
668 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
669 &Data);
670 Data = Data | 0x10;
671 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
672 Data);
673
674 dev_dbg(&port->dev, "port number is %d\n", port->port_number);
675 dev_dbg(&port->dev, "minor number is %d\n", port->minor);
676 dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
677 dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
678 dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
679 dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
680 mos7840_port->read_urb = port->read_urb;
681
682 /* set up our bulk in urb */
683 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
684 usb_fill_bulk_urb(mos7840_port->read_urb,
685 serial->dev,
686 usb_rcvbulkpipe(serial->dev,
687 (port->bulk_in_endpointAddress) + 2),
688 port->bulk_in_buffer,
689 mos7840_port->read_urb->transfer_buffer_length,
690 mos7840_bulk_in_callback, mos7840_port);
691 } else {
692 usb_fill_bulk_urb(mos7840_port->read_urb,
693 serial->dev,
694 usb_rcvbulkpipe(serial->dev,
695 port->bulk_in_endpointAddress),
696 port->bulk_in_buffer,
697 mos7840_port->read_urb->transfer_buffer_length,
698 mos7840_bulk_in_callback, mos7840_port);
699 }
700
701 dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
702 mos7840_port->read_urb_busy = true;
703 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
704 if (response) {
705 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
706 __func__, response);
707 mos7840_port->read_urb_busy = false;
708 }
709
710 /* initialize our port settings */
711 /* Must set to enable ints! */
712 mos7840_port->shadowMCR = MCR_MASTER_IE;
713
714 return 0;
715err:
716 for (j = 0; j < NUM_URBS; ++j) {
717 urb = mos7840_port->write_urb_pool[j];
718 if (!urb)
719 continue;
720 kfree(urb->transfer_buffer);
721 usb_free_urb(urb);
722 }
723 return status;
724}
725
726/*****************************************************************************
727 * mos7840_chars_in_buffer
728 * this function is called by the tty driver when it wants to know how many
729 * bytes of data we currently have outstanding in the port (data that has
730 * been written, but hasn't made it out the port yet)
731 *****************************************************************************/
732
733static unsigned int mos7840_chars_in_buffer(struct tty_struct *tty)
734{
735 struct usb_serial_port *port = tty->driver_data;
736 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
737 int i;
738 unsigned int chars = 0;
739 unsigned long flags;
740
741 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
742 for (i = 0; i < NUM_URBS; ++i) {
743 if (mos7840_port->busy[i]) {
744 struct urb *urb = mos7840_port->write_urb_pool[i];
745 chars += urb->transfer_buffer_length;
746 }
747 }
748 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
749 dev_dbg(&port->dev, "%s - returns %u\n", __func__, chars);
750 return chars;
751
752}
753
754/*****************************************************************************
755 * mos7840_close
756 * this function is called by the tty driver when a port is closed
757 *****************************************************************************/
758
759static void mos7840_close(struct usb_serial_port *port)
760{
761 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
762 int j;
763 __u16 Data;
764
765 for (j = 0; j < NUM_URBS; ++j)
766 usb_kill_urb(mos7840_port->write_urb_pool[j]);
767
768 /* Freeing Write URBs */
769 for (j = 0; j < NUM_URBS; ++j) {
770 if (mos7840_port->write_urb_pool[j]) {
771 kfree(mos7840_port->write_urb_pool[j]->transfer_buffer);
772 usb_free_urb(mos7840_port->write_urb_pool[j]);
773 }
774 }
775
776 usb_kill_urb(mos7840_port->read_urb);
777 mos7840_port->read_urb_busy = false;
778
779 Data = 0x0;
780 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
781
782 Data = 0x00;
783 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
784}
785
786/*****************************************************************************
787 * mos7840_break
788 * this function sends a break to the port
789 *****************************************************************************/
790static int mos7840_break(struct tty_struct *tty, int break_state)
791{
792 struct usb_serial_port *port = tty->driver_data;
793 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
794 unsigned char data;
795
796 if (break_state == -1)
797 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
798 else
799 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
800
801 /* FIXME: no locking on shadowLCR anywhere in driver */
802 mos7840_port->shadowLCR = data;
803 dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
804
805 return mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
806 mos7840_port->shadowLCR);
807}
808
809/*****************************************************************************
810 * mos7840_write_room
811 * this function is called by the tty driver when it wants to know how many
812 * bytes of data we can accept for a specific port.
813 *****************************************************************************/
814
815static unsigned int mos7840_write_room(struct tty_struct *tty)
816{
817 struct usb_serial_port *port = tty->driver_data;
818 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
819 int i;
820 unsigned int room = 0;
821 unsigned long flags;
822
823 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
824 for (i = 0; i < NUM_URBS; ++i) {
825 if (!mos7840_port->busy[i])
826 room += URB_TRANSFER_BUFFER_SIZE;
827 }
828 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
829
830 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
831 dev_dbg(&mos7840_port->port->dev, "%s - returns %u\n", __func__, room);
832 return room;
833
834}
835
836/*****************************************************************************
837 * mos7840_write
838 * this function is called by the tty driver when data should be written to
839 * the port.
840 * If successful, we return the number of bytes written, otherwise we
841 * return a negative error number.
842 *****************************************************************************/
843
844static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
845 const unsigned char *data, int count)
846{
847 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
848 struct usb_serial *serial = port->serial;
849 int status;
850 int i;
851 int bytes_sent = 0;
852 int transfer_size;
853 unsigned long flags;
854 struct urb *urb;
855 /* __u16 Data; */
856 const unsigned char *current_position = data;
857
858 /* try to find a free urb in the list */
859 urb = NULL;
860
861 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
862 for (i = 0; i < NUM_URBS; ++i) {
863 if (!mos7840_port->busy[i]) {
864 mos7840_port->busy[i] = 1;
865 urb = mos7840_port->write_urb_pool[i];
866 dev_dbg(&port->dev, "URB:%d\n", i);
867 break;
868 }
869 }
870 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
871
872 if (urb == NULL) {
873 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
874 goto exit;
875 }
876
877 if (urb->transfer_buffer == NULL) {
878 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
879 GFP_ATOMIC);
880 if (!urb->transfer_buffer) {
881 bytes_sent = -ENOMEM;
882 goto exit;
883 }
884 }
885 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
886
887 memcpy(urb->transfer_buffer, current_position, transfer_size);
888
889 /* fill urb with data and submit */
890 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
891 usb_fill_bulk_urb(urb,
892 serial->dev,
893 usb_sndbulkpipe(serial->dev,
894 (port->bulk_out_endpointAddress) + 2),
895 urb->transfer_buffer,
896 transfer_size,
897 mos7840_bulk_out_data_callback, mos7840_port);
898 } else {
899 usb_fill_bulk_urb(urb,
900 serial->dev,
901 usb_sndbulkpipe(serial->dev,
902 port->bulk_out_endpointAddress),
903 urb->transfer_buffer,
904 transfer_size,
905 mos7840_bulk_out_data_callback, mos7840_port);
906 }
907
908 dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
909
910 if (mos7840_port->has_led)
911 mos7840_led_activity(port);
912
913 /* send it down the pipe */
914 status = usb_submit_urb(urb, GFP_ATOMIC);
915
916 if (status) {
917 mos7840_port->busy[i] = 0;
918 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
919 "with status = %d\n", __func__, status);
920 bytes_sent = status;
921 goto exit;
922 }
923 bytes_sent = transfer_size;
924 port->icount.tx += transfer_size;
925 dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
926exit:
927 return bytes_sent;
928
929}
930
931/*****************************************************************************
932 * mos7840_throttle
933 * this function is called by the tty driver when it wants to stop the data
934 * being read from the port.
935 *****************************************************************************/
936
937static void mos7840_throttle(struct tty_struct *tty)
938{
939 struct usb_serial_port *port = tty->driver_data;
940 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
941 int status;
942
943 /* if we are implementing XON/XOFF, send the stop character */
944 if (I_IXOFF(tty)) {
945 unsigned char stop_char = STOP_CHAR(tty);
946 status = mos7840_write(tty, port, &stop_char, 1);
947 if (status <= 0)
948 return;
949 }
950 /* if we are implementing RTS/CTS, toggle that line */
951 if (C_CRTSCTS(tty)) {
952 mos7840_port->shadowMCR &= ~MCR_RTS;
953 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
954 mos7840_port->shadowMCR);
955 if (status < 0)
956 return;
957 }
958}
959
960/*****************************************************************************
961 * mos7840_unthrottle
962 * this function is called by the tty driver when it wants to resume
963 * the data being read from the port (called after mos7840_throttle is
964 * called)
965 *****************************************************************************/
966static void mos7840_unthrottle(struct tty_struct *tty)
967{
968 struct usb_serial_port *port = tty->driver_data;
969 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
970 int status;
971
972 /* if we are implementing XON/XOFF, send the start character */
973 if (I_IXOFF(tty)) {
974 unsigned char start_char = START_CHAR(tty);
975 status = mos7840_write(tty, port, &start_char, 1);
976 if (status <= 0)
977 return;
978 }
979
980 /* if we are implementing RTS/CTS, toggle that line */
981 if (C_CRTSCTS(tty)) {
982 mos7840_port->shadowMCR |= MCR_RTS;
983 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
984 mos7840_port->shadowMCR);
985 if (status < 0)
986 return;
987 }
988}
989
990static int mos7840_tiocmget(struct tty_struct *tty)
991{
992 struct usb_serial_port *port = tty->driver_data;
993 unsigned int result;
994 __u16 msr;
995 __u16 mcr;
996 int status;
997
998 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
999 if (status < 0)
1000 return -EIO;
1001 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1002 if (status < 0)
1003 return -EIO;
1004 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1005 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1006 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1007 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1008 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1009 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1010 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1011
1012 dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1013
1014 return result;
1015}
1016
1017static int mos7840_tiocmset(struct tty_struct *tty,
1018 unsigned int set, unsigned int clear)
1019{
1020 struct usb_serial_port *port = tty->driver_data;
1021 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
1022 unsigned int mcr;
1023 int status;
1024
1025 /* FIXME: What locks the port registers ? */
1026 mcr = mos7840_port->shadowMCR;
1027 if (clear & TIOCM_RTS)
1028 mcr &= ~MCR_RTS;
1029 if (clear & TIOCM_DTR)
1030 mcr &= ~MCR_DTR;
1031 if (clear & TIOCM_LOOP)
1032 mcr &= ~MCR_LOOPBACK;
1033
1034 if (set & TIOCM_RTS)
1035 mcr |= MCR_RTS;
1036 if (set & TIOCM_DTR)
1037 mcr |= MCR_DTR;
1038 if (set & TIOCM_LOOP)
1039 mcr |= MCR_LOOPBACK;
1040
1041 mos7840_port->shadowMCR = mcr;
1042
1043 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1044 if (status < 0) {
1045 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1046 return status;
1047 }
1048
1049 return 0;
1050}
1051
1052/*****************************************************************************
1053 * mos7840_calc_baud_rate_divisor
1054 * this function calculates the proper baud rate divisor for the specified
1055 * baud rate.
1056 *****************************************************************************/
1057static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1058 int baudRate, int *divisor,
1059 __u16 *clk_sel_val)
1060{
1061 dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1062
1063 if (baudRate <= 115200) {
1064 *divisor = 115200 / baudRate;
1065 *clk_sel_val = 0x0;
1066 }
1067 if ((baudRate > 115200) && (baudRate <= 230400)) {
1068 *divisor = 230400 / baudRate;
1069 *clk_sel_val = 0x10;
1070 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1071 *divisor = 403200 / baudRate;
1072 *clk_sel_val = 0x20;
1073 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1074 *divisor = 460800 / baudRate;
1075 *clk_sel_val = 0x30;
1076 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1077 *divisor = 806400 / baudRate;
1078 *clk_sel_val = 0x40;
1079 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1080 *divisor = 921600 / baudRate;
1081 *clk_sel_val = 0x50;
1082 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1083 *divisor = 1572864 / baudRate;
1084 *clk_sel_val = 0x60;
1085 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1086 *divisor = 3145728 / baudRate;
1087 *clk_sel_val = 0x70;
1088 }
1089 return 0;
1090}
1091
1092/*****************************************************************************
1093 * mos7840_send_cmd_write_baud_rate
1094 * this function sends the proper command to change the baud rate of the
1095 * specified port.
1096 *****************************************************************************/
1097
1098static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1099 int baudRate)
1100{
1101 struct usb_serial_port *port = mos7840_port->port;
1102 int divisor = 0;
1103 int status;
1104 __u16 Data;
1105 __u16 clk_sel_val;
1106
1107 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1108 /* reset clk_uart_sel in spregOffset */
1109 if (baudRate > 115200) {
1110#ifdef HW_flow_control
1111 /* NOTE: need to see the pther register to modify */
1112 /* setting h/w flow control bit to 1 */
1113 Data = 0x2b;
1114 mos7840_port->shadowMCR = Data;
1115 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1116 Data);
1117 if (status < 0) {
1118 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1119 return -1;
1120 }
1121#endif
1122
1123 } else {
1124#ifdef HW_flow_control
1125 /* setting h/w flow control bit to 0 */
1126 Data = 0xb;
1127 mos7840_port->shadowMCR = Data;
1128 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1129 Data);
1130 if (status < 0) {
1131 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1132 return -1;
1133 }
1134#endif
1135
1136 }
1137
1138 if (1) { /* baudRate <= 115200) */
1139 clk_sel_val = 0x0;
1140 Data = 0x0;
1141 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1142 &clk_sel_val);
1143 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1144 &Data);
1145 if (status < 0) {
1146 dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1147 return -1;
1148 }
1149 Data = (Data & 0x8f) | clk_sel_val;
1150 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1151 Data);
1152 if (status < 0) {
1153 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1154 return -1;
1155 }
1156 /* Calculate the Divisor */
1157
1158 if (status) {
1159 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1160 return status;
1161 }
1162 /* Enable access to divisor latch */
1163 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1164 mos7840_port->shadowLCR = Data;
1165 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1166
1167 /* Write the divisor */
1168 Data = (unsigned char)(divisor & 0xff);
1169 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1170 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1171
1172 Data = (unsigned char)((divisor & 0xff00) >> 8);
1173 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1174 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1175
1176 /* Disable access to divisor latch */
1177 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1178 mos7840_port->shadowLCR = Data;
1179 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1180
1181 }
1182 return status;
1183}
1184
1185/*****************************************************************************
1186 * mos7840_change_port_settings
1187 * This routine is called to set the UART on the device to match
1188 * the specified new settings.
1189 *****************************************************************************/
1190
1191static void mos7840_change_port_settings(struct tty_struct *tty,
1192 struct moschip_port *mos7840_port,
1193 const struct ktermios *old_termios)
1194{
1195 struct usb_serial_port *port = mos7840_port->port;
1196 int baud;
1197 unsigned cflag;
1198 __u8 lData;
1199 __u8 lParity;
1200 __u8 lStop;
1201 int status;
1202 __u16 Data;
1203
1204 lData = LCR_BITS_8;
1205 lStop = LCR_STOP_1;
1206 lParity = LCR_PAR_NONE;
1207
1208 cflag = tty->termios.c_cflag;
1209
1210 /* Change the number of bits */
1211 switch (cflag & CSIZE) {
1212 case CS5:
1213 lData = LCR_BITS_5;
1214 break;
1215
1216 case CS6:
1217 lData = LCR_BITS_6;
1218 break;
1219
1220 case CS7:
1221 lData = LCR_BITS_7;
1222 break;
1223
1224 default:
1225 case CS8:
1226 lData = LCR_BITS_8;
1227 break;
1228 }
1229
1230 /* Change the Parity bit */
1231 if (cflag & PARENB) {
1232 if (cflag & PARODD) {
1233 lParity = LCR_PAR_ODD;
1234 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1235 } else {
1236 lParity = LCR_PAR_EVEN;
1237 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1238 }
1239
1240 } else {
1241 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1242 }
1243
1244 if (cflag & CMSPAR)
1245 lParity = lParity | 0x20;
1246
1247 /* Change the Stop bit */
1248 if (cflag & CSTOPB) {
1249 lStop = LCR_STOP_2;
1250 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1251 } else {
1252 lStop = LCR_STOP_1;
1253 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1254 }
1255
1256 /* Update the LCR with the correct value */
1257 mos7840_port->shadowLCR &=
1258 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1259 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1260
1261 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1262 mos7840_port->shadowLCR);
1263 /* Disable Interrupts */
1264 Data = 0x00;
1265 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1266
1267 Data = 0x00;
1268 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1269
1270 Data = 0xcf;
1271 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1272
1273 /* Send the updated LCR value to the mos7840 */
1274 Data = mos7840_port->shadowLCR;
1275
1276 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1277
1278 Data = 0x00b;
1279 mos7840_port->shadowMCR = Data;
1280 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1281 Data = 0x00b;
1282 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1283
1284 /* set up the MCR register and send it to the mos7840 */
1285
1286 mos7840_port->shadowMCR = MCR_MASTER_IE;
1287 if (cflag & CBAUD)
1288 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1289
1290 if (cflag & CRTSCTS)
1291 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1292 else
1293 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1294
1295 Data = mos7840_port->shadowMCR;
1296 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1297
1298 /* Determine divisor based on baud rate */
1299 baud = tty_get_baud_rate(tty);
1300
1301 if (!baud) {
1302 /* pick a default, any default... */
1303 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1304 baud = 9600;
1305 }
1306
1307 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1308 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1309
1310 /* Enable Interrupts */
1311 Data = 0x0c;
1312 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1313
1314 if (!mos7840_port->read_urb_busy) {
1315 mos7840_port->read_urb_busy = true;
1316 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1317 if (status) {
1318 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1319 status);
1320 mos7840_port->read_urb_busy = false;
1321 }
1322 }
1323 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1324 mos7840_port->shadowLCR);
1325}
1326
1327/*****************************************************************************
1328 * mos7840_set_termios
1329 * this function is called by the tty driver when it wants to change
1330 * the termios structure
1331 *****************************************************************************/
1332
1333static void mos7840_set_termios(struct tty_struct *tty,
1334 struct usb_serial_port *port,
1335 const struct ktermios *old_termios)
1336{
1337 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
1338 int status;
1339
1340 /* change the port settings to the new ones specified */
1341
1342 mos7840_change_port_settings(tty, mos7840_port, old_termios);
1343
1344 if (!mos7840_port->read_urb_busy) {
1345 mos7840_port->read_urb_busy = true;
1346 status = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1347 if (status) {
1348 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1349 status);
1350 mos7840_port->read_urb_busy = false;
1351 }
1352 }
1353}
1354
1355/*****************************************************************************
1356 * mos7840_get_lsr_info - get line status register info
1357 *
1358 * Purpose: Let user call ioctl() to get info when the UART physically
1359 * is emptied. On bus types like RS485, the transmitter must
1360 * release the bus after transmitting. This must be done when
1361 * the transmit shift register is empty, not be done when the
1362 * transmit holding register is empty. This functionality
1363 * allows an RS485 driver to be written in user space.
1364 *****************************************************************************/
1365
1366static int mos7840_get_lsr_info(struct tty_struct *tty,
1367 unsigned int __user *value)
1368{
1369 int count;
1370 unsigned int result = 0;
1371
1372 count = mos7840_chars_in_buffer(tty);
1373 if (count == 0)
1374 result = TIOCSER_TEMT;
1375
1376 if (copy_to_user(value, &result, sizeof(int)))
1377 return -EFAULT;
1378 return 0;
1379}
1380
1381/*****************************************************************************
1382 * SerialIoctl
1383 * this function handles any ioctl calls to the driver
1384 *****************************************************************************/
1385
1386static int mos7840_ioctl(struct tty_struct *tty,
1387 unsigned int cmd, unsigned long arg)
1388{
1389 struct usb_serial_port *port = tty->driver_data;
1390 void __user *argp = (void __user *)arg;
1391
1392 switch (cmd) {
1393 /* return number of bytes available */
1394
1395 case TIOCSERGETLSR:
1396 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
1397 return mos7840_get_lsr_info(tty, argp);
1398
1399 default:
1400 break;
1401 }
1402 return -ENOIOCTLCMD;
1403}
1404
1405/*
1406 * Check if GPO (pin 42) is connected to GPI (pin 33) as recommended by ASIX
1407 * for MCS7810 by bit-banging a 16-bit word.
1408 *
1409 * Note that GPO is really RTS of the third port so this will toggle RTS of
1410 * port two or three on two- and four-port devices.
1411 */
1412static int mos7810_check(struct usb_serial *serial)
1413{
1414 int i, pass_count = 0;
1415 u8 *buf;
1416 __u16 data = 0, mcr_data = 0;
1417 __u16 test_pattern = 0x55AA;
1418 int res;
1419
1420 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
1421 if (!buf)
1422 return 0; /* failed to identify 7810 */
1423
1424 /* Store MCR setting */
1425 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1426 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
1427 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1428 if (res == VENDOR_READ_LENGTH)
1429 mcr_data = *buf;
1430
1431 for (i = 0; i < 16; i++) {
1432 /* Send the 1-bit test pattern out to MCS7810 test pin */
1433 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
1434 MCS_WRREQ, MCS_WR_RTYPE,
1435 (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
1436 MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
1437
1438 /* Read the test pattern back */
1439 res = usb_control_msg(serial->dev,
1440 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
1441 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
1442 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1443 if (res == VENDOR_READ_LENGTH)
1444 data = *buf;
1445
1446 /* If this is a MCS7810 device, both test patterns must match */
1447 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
1448 break;
1449
1450 pass_count++;
1451 }
1452
1453 /* Restore MCR setting */
1454 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
1455 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
1456 0, MOS_WDR_TIMEOUT);
1457
1458 kfree(buf);
1459
1460 if (pass_count == 16)
1461 return 1;
1462
1463 return 0;
1464}
1465
1466static int mos7840_probe(struct usb_serial *serial,
1467 const struct usb_device_id *id)
1468{
1469 unsigned long device_flags = id->driver_info;
1470 u8 *buf;
1471
1472 /* Skip device-type detection if we already have device flags. */
1473 if (device_flags)
1474 goto out;
1475
1476 buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
1477 if (!buf)
1478 return -ENOMEM;
1479
1480 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
1481 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
1482 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
1483
1484 /* For a MCS7840 device GPIO0 must be set to 1 */
1485 if (buf[0] & 0x01)
1486 device_flags = MCS_PORTS(4);
1487 else if (mos7810_check(serial))
1488 device_flags = MCS_PORTS(1) | MCS_LED;
1489 else
1490 device_flags = MCS_PORTS(2);
1491
1492 kfree(buf);
1493out:
1494 usb_set_serial_data(serial, (void *)device_flags);
1495
1496 return 0;
1497}
1498
1499static int mos7840_calc_num_ports(struct usb_serial *serial,
1500 struct usb_serial_endpoints *epds)
1501{
1502 unsigned long device_flags = (unsigned long)usb_get_serial_data(serial);
1503 int num_ports = MCS_PORTS(device_flags);
1504
1505 if (num_ports == 0 || num_ports > 4)
1506 return -ENODEV;
1507
1508 if (epds->num_bulk_in < num_ports || epds->num_bulk_out < num_ports) {
1509 dev_err(&serial->interface->dev, "missing endpoints\n");
1510 return -ENODEV;
1511 }
1512
1513 return num_ports;
1514}
1515
1516static int mos7840_attach(struct usb_serial *serial)
1517{
1518 struct device *dev = &serial->interface->dev;
1519 int status;
1520 u16 val;
1521
1522 /* Zero Length flag enable */
1523 val = 0x0f;
1524 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, val);
1525 if (status < 0)
1526 dev_dbg(dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
1527 else
1528 dev_dbg(dev, "ZLP_REG5 Writing success status%d\n", status);
1529
1530 return status;
1531}
1532
1533static int mos7840_port_probe(struct usb_serial_port *port)
1534{
1535 struct usb_serial *serial = port->serial;
1536 unsigned long device_flags = (unsigned long)usb_get_serial_data(serial);
1537 struct moschip_port *mos7840_port;
1538 int status;
1539 int pnum;
1540 __u16 Data;
1541
1542 /* we set up the pointers to the endpoints in the mos7840_open *
1543 * function, as the structures aren't created yet. */
1544
1545 pnum = port->port_number;
1546
1547 dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
1548 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
1549 if (!mos7840_port)
1550 return -ENOMEM;
1551
1552 /* Initialize all port interrupt end point to port 0 int
1553 * endpoint. Our device has only one interrupt end point
1554 * common to all port */
1555
1556 mos7840_port->port = port;
1557 spin_lock_init(&mos7840_port->pool_lock);
1558
1559 /* minor is not initialised until later by
1560 * usb-serial.c:get_free_serial() and cannot therefore be used
1561 * to index device instances */
1562 mos7840_port->port_num = pnum + 1;
1563 dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
1564 dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
1565
1566 if (mos7840_port->port_num == 1) {
1567 mos7840_port->SpRegOffset = 0x0;
1568 mos7840_port->ControlRegOffset = 0x1;
1569 mos7840_port->DcrRegOffset = 0x4;
1570 } else {
1571 u8 phy_num = mos7840_port->port_num;
1572
1573 /* Port 2 in the 2-port case uses registers of port 3 */
1574 if (serial->num_ports == 2)
1575 phy_num = 3;
1576
1577 mos7840_port->SpRegOffset = 0x8 + 2 * (phy_num - 2);
1578 mos7840_port->ControlRegOffset = 0x9 + 2 * (phy_num - 2);
1579 mos7840_port->DcrRegOffset = 0x16 + 3 * (phy_num - 2);
1580 }
1581 mos7840_dump_serial_port(port, mos7840_port);
1582 usb_set_serial_port_data(port, mos7840_port);
1583
1584 /* enable rx_disable bit in control register */
1585 status = mos7840_get_reg_sync(port,
1586 mos7840_port->ControlRegOffset, &Data);
1587 if (status < 0) {
1588 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
1589 goto error;
1590 } else
1591 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
1592 Data |= 0x08; /* setting driver done bit */
1593 Data |= 0x04; /* sp1_bit to have cts change reflect in
1594 modem status reg */
1595
1596 /* Data |= 0x20; //rx_disable bit */
1597 status = mos7840_set_reg_sync(port,
1598 mos7840_port->ControlRegOffset, Data);
1599 if (status < 0) {
1600 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
1601 goto error;
1602 } else
1603 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
1604
1605 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
1606 and 0x24 in DCR3 */
1607 Data = 0x01;
1608 status = mos7840_set_reg_sync(port,
1609 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
1610 if (status < 0) {
1611 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
1612 goto error;
1613 } else
1614 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
1615
1616 Data = 0x05;
1617 status = mos7840_set_reg_sync(port,
1618 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
1619 if (status < 0) {
1620 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
1621 goto error;
1622 } else
1623 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
1624
1625 Data = 0x24;
1626 status = mos7840_set_reg_sync(port,
1627 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
1628 if (status < 0) {
1629 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
1630 goto error;
1631 } else
1632 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
1633
1634 /* write values in clkstart0x0 and clkmulti 0x20 */
1635 Data = 0x0;
1636 status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
1637 if (status < 0) {
1638 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
1639 goto error;
1640 } else
1641 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
1642
1643 Data = 0x20;
1644 status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
1645 if (status < 0) {
1646 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
1647 goto error;
1648 } else
1649 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
1650
1651 /* write value 0x0 to scratchpad register */
1652 Data = 0x00;
1653 status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
1654 if (status < 0) {
1655 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
1656 goto error;
1657 } else
1658 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
1659
1660 /* Zero Length flag register */
1661 if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
1662 Data = 0xff;
1663 status = mos7840_set_reg_sync(port,
1664 (__u16) (ZLP_REG1 +
1665 ((__u16)mos7840_port->port_num)), Data);
1666 dev_dbg(&port->dev, "ZLIP offset %x\n",
1667 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
1668 if (status < 0) {
1669 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
1670 goto error;
1671 } else
1672 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
1673 } else {
1674 Data = 0xff;
1675 status = mos7840_set_reg_sync(port,
1676 (__u16) (ZLP_REG1 +
1677 ((__u16)mos7840_port->port_num) - 0x1), Data);
1678 dev_dbg(&port->dev, "ZLIP offset %x\n",
1679 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
1680 if (status < 0) {
1681 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
1682 goto error;
1683 } else
1684 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
1685
1686 }
1687
1688 mos7840_port->has_led = device_flags & MCS_LED;
1689
1690 /* Initialize LED timers */
1691 if (mos7840_port->has_led) {
1692 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
1693 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
1694 GFP_KERNEL);
1695 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
1696 status = -ENOMEM;
1697 goto error;
1698 }
1699
1700 timer_setup(&mos7840_port->led_timer1, mos7840_led_off, 0);
1701 mos7840_port->led_timer1.expires =
1702 jiffies + msecs_to_jiffies(LED_ON_MS);
1703 timer_setup(&mos7840_port->led_timer2, mos7840_led_flag_off,
1704 0);
1705 mos7840_port->led_timer2.expires =
1706 jiffies + msecs_to_jiffies(LED_OFF_MS);
1707
1708 /* Turn off LED */
1709 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
1710 }
1711
1712 return 0;
1713error:
1714 kfree(mos7840_port->led_dr);
1715 usb_free_urb(mos7840_port->led_urb);
1716 kfree(mos7840_port);
1717
1718 return status;
1719}
1720
1721static void mos7840_port_remove(struct usb_serial_port *port)
1722{
1723 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
1724
1725 if (mos7840_port->has_led) {
1726 /* Turn off LED */
1727 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
1728
1729 timer_shutdown_sync(&mos7840_port->led_timer1);
1730 timer_shutdown_sync(&mos7840_port->led_timer2);
1731
1732 usb_kill_urb(mos7840_port->led_urb);
1733 usb_free_urb(mos7840_port->led_urb);
1734 kfree(mos7840_port->led_dr);
1735 }
1736
1737 kfree(mos7840_port);
1738}
1739
1740static struct usb_serial_driver moschip7840_4port_device = {
1741 .driver = {
1742 .owner = THIS_MODULE,
1743 .name = "mos7840",
1744 },
1745 .description = DRIVER_DESC,
1746 .id_table = id_table,
1747 .num_interrupt_in = 1,
1748 .open = mos7840_open,
1749 .close = mos7840_close,
1750 .write = mos7840_write,
1751 .write_room = mos7840_write_room,
1752 .chars_in_buffer = mos7840_chars_in_buffer,
1753 .throttle = mos7840_throttle,
1754 .unthrottle = mos7840_unthrottle,
1755 .calc_num_ports = mos7840_calc_num_ports,
1756 .probe = mos7840_probe,
1757 .attach = mos7840_attach,
1758 .ioctl = mos7840_ioctl,
1759 .set_termios = mos7840_set_termios,
1760 .break_ctl = mos7840_break,
1761 .tiocmget = mos7840_tiocmget,
1762 .tiocmset = mos7840_tiocmset,
1763 .get_icount = usb_serial_generic_get_icount,
1764 .port_probe = mos7840_port_probe,
1765 .port_remove = mos7840_port_remove,
1766 .read_bulk_callback = mos7840_bulk_in_callback,
1767};
1768
1769static struct usb_serial_driver * const serial_drivers[] = {
1770 &moschip7840_4port_device, NULL
1771};
1772
1773module_usb_serial_driver(serial_drivers, id_table);
1774
1775MODULE_DESCRIPTION(DRIVER_DESC);
1776MODULE_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/slab.h>
28#include <linux/tty.h>
29#include <linux/tty_driver.h>
30#include <linux/tty_flip.h>
31#include <linux/module.h>
32#include <linux/serial.h>
33#include <linux/usb.h>
34#include <linux/usb/serial.h>
35#include <linux/uaccess.h>
36
37#define DRIVER_DESC "Moschip 7840/7820 USB Serial Driver"
38
39/*
40 * 16C50 UART register defines
41 */
42
43#define LCR_BITS_5 0x00 /* 5 bits/char */
44#define LCR_BITS_6 0x01 /* 6 bits/char */
45#define LCR_BITS_7 0x02 /* 7 bits/char */
46#define LCR_BITS_8 0x03 /* 8 bits/char */
47#define LCR_BITS_MASK 0x03 /* Mask for bits/char field */
48
49#define LCR_STOP_1 0x00 /* 1 stop bit */
50#define LCR_STOP_1_5 0x04 /* 1.5 stop bits (if 5 bits/char) */
51#define LCR_STOP_2 0x04 /* 2 stop bits (if 6-8 bits/char) */
52#define LCR_STOP_MASK 0x04 /* Mask for stop bits field */
53
54#define LCR_PAR_NONE 0x00 /* No parity */
55#define LCR_PAR_ODD 0x08 /* Odd parity */
56#define LCR_PAR_EVEN 0x18 /* Even parity */
57#define LCR_PAR_MARK 0x28 /* Force parity bit to 1 */
58#define LCR_PAR_SPACE 0x38 /* Force parity bit to 0 */
59#define LCR_PAR_MASK 0x38 /* Mask for parity field */
60
61#define LCR_SET_BREAK 0x40 /* Set Break condition */
62#define LCR_DL_ENABLE 0x80 /* Enable access to divisor latch */
63
64#define MCR_DTR 0x01 /* Assert DTR */
65#define MCR_RTS 0x02 /* Assert RTS */
66#define MCR_OUT1 0x04 /* Loopback only: Sets state of RI */
67#define MCR_MASTER_IE 0x08 /* Enable interrupt outputs */
68#define MCR_LOOPBACK 0x10 /* Set internal (digital) loopback mode */
69#define MCR_XON_ANY 0x20 /* Enable any char to exit XOFF mode */
70
71#define MOS7840_MSR_CTS 0x10 /* Current state of CTS */
72#define MOS7840_MSR_DSR 0x20 /* Current state of DSR */
73#define MOS7840_MSR_RI 0x40 /* Current state of RI */
74#define MOS7840_MSR_CD 0x80 /* Current state of CD */
75
76/*
77 * Defines used for sending commands to port
78 */
79
80#define MOS_WDR_TIMEOUT 5000 /* default urb timeout */
81
82#define MOS_PORT1 0x0200
83#define MOS_PORT2 0x0300
84#define MOS_VENREG 0x0000
85#define MOS_MAX_PORT 0x02
86#define MOS_WRITE 0x0E
87#define MOS_READ 0x0D
88
89/* Requests */
90#define MCS_RD_RTYPE 0xC0
91#define MCS_WR_RTYPE 0x40
92#define MCS_RDREQ 0x0D
93#define MCS_WRREQ 0x0E
94#define MCS_CTRL_TIMEOUT 500
95#define VENDOR_READ_LENGTH (0x01)
96
97#define MAX_NAME_LEN 64
98
99#define ZLP_REG1 0x3A /* Zero_Flag_Reg1 58 */
100#define ZLP_REG5 0x3E /* Zero_Flag_Reg5 62 */
101
102/* For higher baud Rates use TIOCEXBAUD */
103#define TIOCEXBAUD 0x5462
104
105/* vendor id and device id defines */
106
107/* The native mos7840/7820 component */
108#define USB_VENDOR_ID_MOSCHIP 0x9710
109#define MOSCHIP_DEVICE_ID_7840 0x7840
110#define MOSCHIP_DEVICE_ID_7820 0x7820
111#define MOSCHIP_DEVICE_ID_7810 0x7810
112/* The native component can have its vendor/device id's overridden
113 * in vendor-specific implementations. Such devices can be handled
114 * by making a change here, in id_table.
115 */
116#define USB_VENDOR_ID_BANDB 0x0856
117#define BANDB_DEVICE_ID_USO9ML2_2 0xAC22
118#define BANDB_DEVICE_ID_USO9ML2_2P 0xBC00
119#define BANDB_DEVICE_ID_USO9ML2_4 0xAC24
120#define BANDB_DEVICE_ID_USO9ML2_4P 0xBC01
121#define BANDB_DEVICE_ID_US9ML2_2 0xAC29
122#define BANDB_DEVICE_ID_US9ML2_4 0xAC30
123#define BANDB_DEVICE_ID_USPTL4_2 0xAC31
124#define BANDB_DEVICE_ID_USPTL4_4 0xAC32
125#define BANDB_DEVICE_ID_USOPTL4_2 0xAC42
126#define BANDB_DEVICE_ID_USOPTL4_2P 0xBC02
127#define BANDB_DEVICE_ID_USOPTL4_4 0xAC44
128#define BANDB_DEVICE_ID_USOPTL4_4P 0xBC03
129#define BANDB_DEVICE_ID_USOPTL2_4 0xAC24
130
131/* This driver also supports
132 * ATEN UC2324 device using Moschip MCS7840
133 * ATEN UC2322 device using Moschip MCS7820
134 */
135#define USB_VENDOR_ID_ATENINTL 0x0557
136#define ATENINTL_DEVICE_ID_UC2324 0x2011
137#define ATENINTL_DEVICE_ID_UC2322 0x7820
138
139/* Interrupt Routine Defines */
140
141#define SERIAL_IIR_RLS 0x06
142#define SERIAL_IIR_MS 0x00
143
144/*
145 * Emulation of the bit mask on the LINE STATUS REGISTER.
146 */
147#define SERIAL_LSR_DR 0x0001
148#define SERIAL_LSR_OE 0x0002
149#define SERIAL_LSR_PE 0x0004
150#define SERIAL_LSR_FE 0x0008
151#define SERIAL_LSR_BI 0x0010
152
153#define MOS_MSR_DELTA_CTS 0x10
154#define MOS_MSR_DELTA_DSR 0x20
155#define MOS_MSR_DELTA_RI 0x40
156#define MOS_MSR_DELTA_CD 0x80
157
158/* Serial Port register Address */
159#define INTERRUPT_ENABLE_REGISTER ((__u16)(0x01))
160#define FIFO_CONTROL_REGISTER ((__u16)(0x02))
161#define LINE_CONTROL_REGISTER ((__u16)(0x03))
162#define MODEM_CONTROL_REGISTER ((__u16)(0x04))
163#define LINE_STATUS_REGISTER ((__u16)(0x05))
164#define MODEM_STATUS_REGISTER ((__u16)(0x06))
165#define SCRATCH_PAD_REGISTER ((__u16)(0x07))
166#define DIVISOR_LATCH_LSB ((__u16)(0x00))
167#define DIVISOR_LATCH_MSB ((__u16)(0x01))
168
169#define CLK_MULTI_REGISTER ((__u16)(0x02))
170#define CLK_START_VALUE_REGISTER ((__u16)(0x03))
171#define GPIO_REGISTER ((__u16)(0x07))
172
173#define SERIAL_LCR_DLAB ((__u16)(0x0080))
174
175/*
176 * URB POOL related defines
177 */
178#define NUM_URBS 16 /* URB Count */
179#define URB_TRANSFER_BUFFER_SIZE 32 /* URB Size */
180
181/* LED on/off milliseconds*/
182#define LED_ON_MS 500
183#define LED_OFF_MS 500
184
185enum mos7840_flag {
186 MOS7840_FLAG_CTRL_BUSY,
187 MOS7840_FLAG_LED_BUSY,
188};
189
190static const struct usb_device_id id_table[] = {
191 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7840)},
192 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7820)},
193 {USB_DEVICE(USB_VENDOR_ID_MOSCHIP, MOSCHIP_DEVICE_ID_7810)},
194 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2)},
195 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_2P)},
196 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4)},
197 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USO9ML2_4P)},
198 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_2)},
199 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_US9ML2_4)},
200 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_2)},
201 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USPTL4_4)},
202 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2)},
203 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_2P)},
204 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4)},
205 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL4_4P)},
206 {USB_DEVICE(USB_VENDOR_ID_BANDB, BANDB_DEVICE_ID_USOPTL2_4)},
207 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2324)},
208 {USB_DEVICE(USB_VENDOR_ID_ATENINTL, ATENINTL_DEVICE_ID_UC2322)},
209 {} /* terminating entry */
210};
211MODULE_DEVICE_TABLE(usb, id_table);
212
213/* This structure holds all of the local port information */
214
215struct moschip_port {
216 int port_num; /*Actual port number in the device(1,2,etc) */
217 struct urb *write_urb; /* write URB for this port */
218 struct urb *read_urb; /* read URB for this port */
219 __u8 shadowLCR; /* last LCR value received */
220 __u8 shadowMCR; /* last MCR value received */
221 char open;
222 char open_ports;
223 struct usb_serial_port *port; /* loop back to the owner of this object */
224
225 /* Offsets */
226 __u8 SpRegOffset;
227 __u8 ControlRegOffset;
228 __u8 DcrRegOffset;
229 /* for processing control URBS in interrupt context */
230 struct urb *control_urb;
231 struct usb_ctrlrequest *dr;
232 char *ctrl_buf;
233 int MsrLsr;
234
235 spinlock_t pool_lock;
236 struct urb *write_urb_pool[NUM_URBS];
237 char busy[NUM_URBS];
238 bool read_urb_busy;
239
240 /* For device(s) with LED indicator */
241 bool has_led;
242 struct timer_list led_timer1; /* Timer for LED on */
243 struct timer_list led_timer2; /* Timer for LED off */
244 struct urb *led_urb;
245 struct usb_ctrlrequest *led_dr;
246
247 unsigned long flags;
248};
249
250/*
251 * mos7840_set_reg_sync
252 * To set the Control register by calling usb_fill_control_urb function
253 * by passing usb_sndctrlpipe function as parameter.
254 */
255
256static int mos7840_set_reg_sync(struct usb_serial_port *port, __u16 reg,
257 __u16 val)
258{
259 struct usb_device *dev = port->serial->dev;
260 val = val & 0x00ff;
261 dev_dbg(&port->dev, "mos7840_set_reg_sync offset is %x, value %x\n", reg, val);
262
263 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
264 MCS_WR_RTYPE, val, reg, NULL, 0,
265 MOS_WDR_TIMEOUT);
266}
267
268/*
269 * mos7840_get_reg_sync
270 * To set the Uart register by calling usb_fill_control_urb function by
271 * passing usb_rcvctrlpipe function as parameter.
272 */
273
274static int mos7840_get_reg_sync(struct usb_serial_port *port, __u16 reg,
275 __u16 *val)
276{
277 struct usb_device *dev = port->serial->dev;
278 int ret = 0;
279 u8 *buf;
280
281 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
282 if (!buf)
283 return -ENOMEM;
284
285 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
286 MCS_RD_RTYPE, 0, reg, buf, VENDOR_READ_LENGTH,
287 MOS_WDR_TIMEOUT);
288 *val = buf[0];
289 dev_dbg(&port->dev, "%s offset is %x, return val %x\n", __func__, reg, *val);
290
291 kfree(buf);
292 return ret;
293}
294
295/*
296 * mos7840_set_uart_reg
297 * To set the Uart register by calling usb_fill_control_urb function by
298 * passing usb_sndctrlpipe function as parameter.
299 */
300
301static int mos7840_set_uart_reg(struct usb_serial_port *port, __u16 reg,
302 __u16 val)
303{
304
305 struct usb_device *dev = port->serial->dev;
306 val = val & 0x00ff;
307 /* For the UART control registers, the application number need
308 to be Or'ed */
309 if (port->serial->num_ports == 4) {
310 val |= ((__u16)port->port_number + 1) << 8;
311 } else {
312 if (port->port_number == 0) {
313 val |= ((__u16)port->port_number + 1) << 8;
314 } else {
315 val |= ((__u16)port->port_number + 2) << 8;
316 }
317 }
318 dev_dbg(&port->dev, "%s application number is %x\n", __func__, val);
319 return usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ,
320 MCS_WR_RTYPE, val, reg, NULL, 0,
321 MOS_WDR_TIMEOUT);
322
323}
324
325/*
326 * mos7840_get_uart_reg
327 * To set the Control register by calling usb_fill_control_urb function
328 * by passing usb_rcvctrlpipe function as parameter.
329 */
330static int mos7840_get_uart_reg(struct usb_serial_port *port, __u16 reg,
331 __u16 *val)
332{
333 struct usb_device *dev = port->serial->dev;
334 int ret = 0;
335 __u16 Wval;
336 u8 *buf;
337
338 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
339 if (!buf)
340 return -ENOMEM;
341
342 /* Wval is same as application number */
343 if (port->serial->num_ports == 4) {
344 Wval = ((__u16)port->port_number + 1) << 8;
345 } else {
346 if (port->port_number == 0) {
347 Wval = ((__u16)port->port_number + 1) << 8;
348 } else {
349 Wval = ((__u16)port->port_number + 2) << 8;
350 }
351 }
352 dev_dbg(&port->dev, "%s application number is %x\n", __func__, Wval);
353 ret = usb_control_msg(dev, usb_rcvctrlpipe(dev, 0), MCS_RDREQ,
354 MCS_RD_RTYPE, Wval, reg, buf, VENDOR_READ_LENGTH,
355 MOS_WDR_TIMEOUT);
356 *val = buf[0];
357
358 kfree(buf);
359 return ret;
360}
361
362static void mos7840_dump_serial_port(struct usb_serial_port *port,
363 struct moschip_port *mos7840_port)
364{
365
366 dev_dbg(&port->dev, "SpRegOffset is %2x\n", mos7840_port->SpRegOffset);
367 dev_dbg(&port->dev, "ControlRegOffset is %2x\n", mos7840_port->ControlRegOffset);
368 dev_dbg(&port->dev, "DCRRegOffset is %2x\n", mos7840_port->DcrRegOffset);
369
370}
371
372/************************************************************************/
373/************************************************************************/
374/* I N T E R F A C E F U N C T I O N S */
375/* I N T E R F A C E F U N C T I O N S */
376/************************************************************************/
377/************************************************************************/
378
379static inline void mos7840_set_port_private(struct usb_serial_port *port,
380 struct moschip_port *data)
381{
382 usb_set_serial_port_data(port, (void *)data);
383}
384
385static inline struct moschip_port *mos7840_get_port_private(struct
386 usb_serial_port
387 *port)
388{
389 return (struct moschip_port *)usb_get_serial_port_data(port);
390}
391
392static void mos7840_handle_new_msr(struct moschip_port *port, __u8 new_msr)
393{
394 struct moschip_port *mos7840_port;
395 struct async_icount *icount;
396 mos7840_port = port;
397 if (new_msr &
398 (MOS_MSR_DELTA_CTS | MOS_MSR_DELTA_DSR | MOS_MSR_DELTA_RI |
399 MOS_MSR_DELTA_CD)) {
400 icount = &mos7840_port->port->icount;
401
402 /* update input line counters */
403 if (new_msr & MOS_MSR_DELTA_CTS)
404 icount->cts++;
405 if (new_msr & MOS_MSR_DELTA_DSR)
406 icount->dsr++;
407 if (new_msr & MOS_MSR_DELTA_CD)
408 icount->dcd++;
409 if (new_msr & MOS_MSR_DELTA_RI)
410 icount->rng++;
411
412 wake_up_interruptible(&port->port->port.delta_msr_wait);
413 }
414}
415
416static void mos7840_handle_new_lsr(struct moschip_port *port, __u8 new_lsr)
417{
418 struct async_icount *icount;
419
420 if (new_lsr & SERIAL_LSR_BI) {
421 /*
422 * Parity and Framing errors only count if they
423 * occur exclusive of a break being
424 * received.
425 */
426 new_lsr &= (__u8) (SERIAL_LSR_OE | SERIAL_LSR_BI);
427 }
428
429 /* update input line counters */
430 icount = &port->port->icount;
431 if (new_lsr & SERIAL_LSR_BI)
432 icount->brk++;
433 if (new_lsr & SERIAL_LSR_OE)
434 icount->overrun++;
435 if (new_lsr & SERIAL_LSR_PE)
436 icount->parity++;
437 if (new_lsr & SERIAL_LSR_FE)
438 icount->frame++;
439}
440
441/************************************************************************/
442/************************************************************************/
443/* U S B C A L L B A C K F U N C T I O N S */
444/* U S B C A L L B A C K F U N C T I O N S */
445/************************************************************************/
446/************************************************************************/
447
448static void mos7840_control_callback(struct urb *urb)
449{
450 unsigned char *data;
451 struct moschip_port *mos7840_port;
452 struct device *dev = &urb->dev->dev;
453 __u8 regval = 0x0;
454 int status = urb->status;
455
456 mos7840_port = urb->context;
457
458 switch (status) {
459 case 0:
460 /* success */
461 break;
462 case -ECONNRESET:
463 case -ENOENT:
464 case -ESHUTDOWN:
465 /* this urb is terminated, clean up */
466 dev_dbg(dev, "%s - urb shutting down with status: %d\n", __func__, status);
467 goto out;
468 default:
469 dev_dbg(dev, "%s - nonzero urb status received: %d\n", __func__, status);
470 goto out;
471 }
472
473 dev_dbg(dev, "%s urb buffer size is %d\n", __func__, urb->actual_length);
474 dev_dbg(dev, "%s mos7840_port->MsrLsr is %d port %d\n", __func__,
475 mos7840_port->MsrLsr, mos7840_port->port_num);
476 data = urb->transfer_buffer;
477 regval = (__u8) data[0];
478 dev_dbg(dev, "%s data is %x\n", __func__, regval);
479 if (mos7840_port->MsrLsr == 0)
480 mos7840_handle_new_msr(mos7840_port, regval);
481 else if (mos7840_port->MsrLsr == 1)
482 mos7840_handle_new_lsr(mos7840_port, regval);
483out:
484 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mos7840_port->flags);
485}
486
487static int mos7840_get_reg(struct moschip_port *mcs, __u16 Wval, __u16 reg,
488 __u16 *val)
489{
490 struct usb_device *dev = mcs->port->serial->dev;
491 struct usb_ctrlrequest *dr = mcs->dr;
492 unsigned char *buffer = mcs->ctrl_buf;
493 int ret;
494
495 if (test_and_set_bit_lock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags))
496 return -EBUSY;
497
498 dr->bRequestType = MCS_RD_RTYPE;
499 dr->bRequest = MCS_RDREQ;
500 dr->wValue = cpu_to_le16(Wval); /* 0 */
501 dr->wIndex = cpu_to_le16(reg);
502 dr->wLength = cpu_to_le16(2);
503
504 usb_fill_control_urb(mcs->control_urb, dev, usb_rcvctrlpipe(dev, 0),
505 (unsigned char *)dr, buffer, 2,
506 mos7840_control_callback, mcs);
507 mcs->control_urb->transfer_buffer_length = 2;
508 ret = usb_submit_urb(mcs->control_urb, GFP_ATOMIC);
509 if (ret)
510 clear_bit_unlock(MOS7840_FLAG_CTRL_BUSY, &mcs->flags);
511
512 return ret;
513}
514
515static void mos7840_set_led_callback(struct urb *urb)
516{
517 switch (urb->status) {
518 case 0:
519 /* Success */
520 break;
521 case -ECONNRESET:
522 case -ENOENT:
523 case -ESHUTDOWN:
524 /* This urb is terminated, clean up */
525 dev_dbg(&urb->dev->dev, "%s - urb shutting down: %d\n",
526 __func__, urb->status);
527 break;
528 default:
529 dev_dbg(&urb->dev->dev, "%s - nonzero urb status: %d\n",
530 __func__, urb->status);
531 }
532}
533
534static void mos7840_set_led_async(struct moschip_port *mcs, __u16 wval,
535 __u16 reg)
536{
537 struct usb_device *dev = mcs->port->serial->dev;
538 struct usb_ctrlrequest *dr = mcs->led_dr;
539
540 dr->bRequestType = MCS_WR_RTYPE;
541 dr->bRequest = MCS_WRREQ;
542 dr->wValue = cpu_to_le16(wval);
543 dr->wIndex = cpu_to_le16(reg);
544 dr->wLength = cpu_to_le16(0);
545
546 usb_fill_control_urb(mcs->led_urb, dev, usb_sndctrlpipe(dev, 0),
547 (unsigned char *)dr, NULL, 0, mos7840_set_led_callback, NULL);
548
549 usb_submit_urb(mcs->led_urb, GFP_ATOMIC);
550}
551
552static void mos7840_set_led_sync(struct usb_serial_port *port, __u16 reg,
553 __u16 val)
554{
555 struct usb_device *dev = port->serial->dev;
556
557 usb_control_msg(dev, usb_sndctrlpipe(dev, 0), MCS_WRREQ, MCS_WR_RTYPE,
558 val, reg, NULL, 0, MOS_WDR_TIMEOUT);
559}
560
561static void mos7840_led_off(unsigned long arg)
562{
563 struct moschip_port *mcs = (struct moschip_port *) arg;
564
565 /* Turn off LED */
566 mos7840_set_led_async(mcs, 0x0300, MODEM_CONTROL_REGISTER);
567 mod_timer(&mcs->led_timer2,
568 jiffies + msecs_to_jiffies(LED_OFF_MS));
569}
570
571static void mos7840_led_flag_off(unsigned long arg)
572{
573 struct moschip_port *mcs = (struct moschip_port *) arg;
574
575 clear_bit_unlock(MOS7840_FLAG_LED_BUSY, &mcs->flags);
576}
577
578static void mos7840_led_activity(struct usb_serial_port *port)
579{
580 struct moschip_port *mos7840_port = usb_get_serial_port_data(port);
581
582 if (test_and_set_bit_lock(MOS7840_FLAG_LED_BUSY, &mos7840_port->flags))
583 return;
584
585 mos7840_set_led_async(mos7840_port, 0x0301, MODEM_CONTROL_REGISTER);
586 mod_timer(&mos7840_port->led_timer1,
587 jiffies + msecs_to_jiffies(LED_ON_MS));
588}
589
590/*****************************************************************************
591 * mos7840_interrupt_callback
592 * this is the callback function for when we have received data on the
593 * interrupt endpoint.
594 *****************************************************************************/
595
596static void mos7840_interrupt_callback(struct urb *urb)
597{
598 int result;
599 int length;
600 struct moschip_port *mos7840_port;
601 struct usb_serial *serial;
602 __u16 Data;
603 unsigned char *data;
604 __u8 sp[5], st;
605 int i, rv = 0;
606 __u16 wval, wreg = 0;
607 int status = urb->status;
608
609 switch (status) {
610 case 0:
611 /* success */
612 break;
613 case -ECONNRESET:
614 case -ENOENT:
615 case -ESHUTDOWN:
616 /* this urb is terminated, clean up */
617 dev_dbg(&urb->dev->dev, "%s - urb shutting down with status: %d\n",
618 __func__, status);
619 return;
620 default:
621 dev_dbg(&urb->dev->dev, "%s - nonzero urb status received: %d\n",
622 __func__, status);
623 goto exit;
624 }
625
626 length = urb->actual_length;
627 data = urb->transfer_buffer;
628
629 serial = urb->context;
630
631 /* Moschip get 5 bytes
632 * Byte 1 IIR Port 1 (port.number is 0)
633 * Byte 2 IIR Port 2 (port.number is 1)
634 * Byte 3 IIR Port 3 (port.number is 2)
635 * Byte 4 IIR Port 4 (port.number is 3)
636 * Byte 5 FIFO status for both */
637
638 if (length && length > 5) {
639 dev_dbg(&urb->dev->dev, "%s", "Wrong data !!!\n");
640 return;
641 }
642
643 sp[0] = (__u8) data[0];
644 sp[1] = (__u8) data[1];
645 sp[2] = (__u8) data[2];
646 sp[3] = (__u8) data[3];
647 st = (__u8) data[4];
648
649 for (i = 0; i < serial->num_ports; i++) {
650 mos7840_port = mos7840_get_port_private(serial->port[i]);
651 wval = ((__u16)serial->port[i]->port_number + 1) << 8;
652 if (mos7840_port->open) {
653 if (sp[i] & 0x01) {
654 dev_dbg(&urb->dev->dev, "SP%d No Interrupt !!!\n", i);
655 } else {
656 switch (sp[i] & 0x0f) {
657 case SERIAL_IIR_RLS:
658 dev_dbg(&urb->dev->dev, "Serial Port %d: Receiver status error or \n", i);
659 dev_dbg(&urb->dev->dev, "address bit detected in 9-bit mode\n");
660 mos7840_port->MsrLsr = 1;
661 wreg = LINE_STATUS_REGISTER;
662 break;
663 case SERIAL_IIR_MS:
664 dev_dbg(&urb->dev->dev, "Serial Port %d: Modem status change\n", i);
665 mos7840_port->MsrLsr = 0;
666 wreg = MODEM_STATUS_REGISTER;
667 break;
668 }
669 rv = mos7840_get_reg(mos7840_port, wval, wreg, &Data);
670 }
671 }
672 }
673 if (!(rv < 0))
674 /* the completion handler for the control urb will resubmit */
675 return;
676exit:
677 result = usb_submit_urb(urb, GFP_ATOMIC);
678 if (result) {
679 dev_err(&urb->dev->dev,
680 "%s - Error %d submitting interrupt urb\n",
681 __func__, result);
682 }
683}
684
685static int mos7840_port_paranoia_check(struct usb_serial_port *port,
686 const char *function)
687{
688 if (!port) {
689 pr_debug("%s - port == NULL\n", function);
690 return -1;
691 }
692 if (!port->serial) {
693 pr_debug("%s - port->serial == NULL\n", function);
694 return -1;
695 }
696
697 return 0;
698}
699
700/* Inline functions to check the sanity of a pointer that is passed to us */
701static int mos7840_serial_paranoia_check(struct usb_serial *serial,
702 const char *function)
703{
704 if (!serial) {
705 pr_debug("%s - serial == NULL\n", function);
706 return -1;
707 }
708 if (!serial->type) {
709 pr_debug("%s - serial->type == NULL!\n", function);
710 return -1;
711 }
712
713 return 0;
714}
715
716static struct usb_serial *mos7840_get_usb_serial(struct usb_serial_port *port,
717 const char *function)
718{
719 /* if no port was specified, or it fails a paranoia check */
720 if (!port ||
721 mos7840_port_paranoia_check(port, function) ||
722 mos7840_serial_paranoia_check(port->serial, function)) {
723 /* then say that we don't have a valid usb_serial thing,
724 * which will end up genrating -ENODEV return values */
725 return NULL;
726 }
727
728 return port->serial;
729}
730
731/*****************************************************************************
732 * mos7840_bulk_in_callback
733 * this is the callback function for when we have received data on the
734 * bulk in endpoint.
735 *****************************************************************************/
736
737static void mos7840_bulk_in_callback(struct urb *urb)
738{
739 int retval;
740 unsigned char *data;
741 struct usb_serial *serial;
742 struct usb_serial_port *port;
743 struct moschip_port *mos7840_port;
744 int status = urb->status;
745
746 mos7840_port = urb->context;
747 if (!mos7840_port)
748 return;
749
750 if (status) {
751 dev_dbg(&urb->dev->dev, "nonzero read bulk status received: %d\n", status);
752 mos7840_port->read_urb_busy = false;
753 return;
754 }
755
756 port = mos7840_port->port;
757 if (mos7840_port_paranoia_check(port, __func__)) {
758 mos7840_port->read_urb_busy = false;
759 return;
760 }
761
762 serial = mos7840_get_usb_serial(port, __func__);
763 if (!serial) {
764 mos7840_port->read_urb_busy = false;
765 return;
766 }
767
768 data = urb->transfer_buffer;
769 usb_serial_debug_data(&port->dev, __func__, urb->actual_length, data);
770
771 if (urb->actual_length) {
772 struct tty_port *tport = &mos7840_port->port->port;
773 tty_insert_flip_string(tport, data, urb->actual_length);
774 tty_flip_buffer_push(tport);
775 port->icount.rx += urb->actual_length;
776 dev_dbg(&port->dev, "icount.rx is %d:\n", port->icount.rx);
777 }
778
779 if (!mos7840_port->read_urb) {
780 dev_dbg(&port->dev, "%s", "URB KILLED !!!\n");
781 mos7840_port->read_urb_busy = false;
782 return;
783 }
784
785 if (mos7840_port->has_led)
786 mos7840_led_activity(port);
787
788 mos7840_port->read_urb_busy = true;
789 retval = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
790
791 if (retval) {
792 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, retval = %d\n", retval);
793 mos7840_port->read_urb_busy = false;
794 }
795}
796
797/*****************************************************************************
798 * mos7840_bulk_out_data_callback
799 * this is the callback function for when we have finished sending
800 * serial data on the bulk out endpoint.
801 *****************************************************************************/
802
803static void mos7840_bulk_out_data_callback(struct urb *urb)
804{
805 struct moschip_port *mos7840_port;
806 struct usb_serial_port *port;
807 int status = urb->status;
808 int i;
809
810 mos7840_port = urb->context;
811 port = mos7840_port->port;
812 spin_lock(&mos7840_port->pool_lock);
813 for (i = 0; i < NUM_URBS; i++) {
814 if (urb == mos7840_port->write_urb_pool[i]) {
815 mos7840_port->busy[i] = 0;
816 break;
817 }
818 }
819 spin_unlock(&mos7840_port->pool_lock);
820
821 if (status) {
822 dev_dbg(&port->dev, "nonzero write bulk status received:%d\n", status);
823 return;
824 }
825
826 if (mos7840_port_paranoia_check(port, __func__))
827 return;
828
829 if (mos7840_port->open)
830 tty_port_tty_wakeup(&port->port);
831
832}
833
834/************************************************************************/
835/* 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 */
836/************************************************************************/
837
838/*****************************************************************************
839 * mos7840_open
840 * this function is called by the tty driver when a port is opened
841 * If successful, we return 0
842 * Otherwise we return a negative error number.
843 *****************************************************************************/
844
845static int mos7840_open(struct tty_struct *tty, struct usb_serial_port *port)
846{
847 int response;
848 int j;
849 struct usb_serial *serial;
850 struct urb *urb;
851 __u16 Data;
852 int status;
853 struct moschip_port *mos7840_port;
854 struct moschip_port *port0;
855
856 if (mos7840_port_paranoia_check(port, __func__))
857 return -ENODEV;
858
859 serial = port->serial;
860
861 if (mos7840_serial_paranoia_check(serial, __func__))
862 return -ENODEV;
863
864 mos7840_port = mos7840_get_port_private(port);
865 port0 = mos7840_get_port_private(serial->port[0]);
866
867 if (mos7840_port == NULL || port0 == NULL)
868 return -ENODEV;
869
870 usb_clear_halt(serial->dev, port->write_urb->pipe);
871 usb_clear_halt(serial->dev, port->read_urb->pipe);
872 port0->open_ports++;
873
874 /* Initialising the write urb pool */
875 for (j = 0; j < NUM_URBS; ++j) {
876 urb = usb_alloc_urb(0, GFP_KERNEL);
877 mos7840_port->write_urb_pool[j] = urb;
878 if (!urb)
879 continue;
880
881 urb->transfer_buffer = kmalloc(URB_TRANSFER_BUFFER_SIZE,
882 GFP_KERNEL);
883 if (!urb->transfer_buffer) {
884 usb_free_urb(urb);
885 mos7840_port->write_urb_pool[j] = NULL;
886 continue;
887 }
888 }
889
890/*****************************************************************************
891 * Initialize MCS7840 -- Write Init values to corresponding Registers
892 *
893 * Register Index
894 * 1 : IER
895 * 2 : FCR
896 * 3 : LCR
897 * 4 : MCR
898 *
899 * 0x08 : SP1/2 Control Reg
900 *****************************************************************************/
901
902 /* NEED to check the following Block */
903
904 Data = 0x0;
905 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
906 if (status < 0) {
907 dev_dbg(&port->dev, "Reading Spreg failed\n");
908 goto err;
909 }
910 Data |= 0x80;
911 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
912 if (status < 0) {
913 dev_dbg(&port->dev, "writing Spreg failed\n");
914 goto err;
915 }
916
917 Data &= ~0x80;
918 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
919 if (status < 0) {
920 dev_dbg(&port->dev, "writing Spreg failed\n");
921 goto err;
922 }
923 /* End of block to be checked */
924
925 Data = 0x0;
926 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
927 &Data);
928 if (status < 0) {
929 dev_dbg(&port->dev, "Reading Controlreg failed\n");
930 goto err;
931 }
932 Data |= 0x08; /* Driver done bit */
933 Data |= 0x20; /* rx_disable */
934 status = mos7840_set_reg_sync(port,
935 mos7840_port->ControlRegOffset, Data);
936 if (status < 0) {
937 dev_dbg(&port->dev, "writing Controlreg failed\n");
938 goto err;
939 }
940 /* do register settings here */
941 /* Set all regs to the device default values. */
942 /***********************************
943 * First Disable all interrupts.
944 ***********************************/
945 Data = 0x00;
946 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
947 if (status < 0) {
948 dev_dbg(&port->dev, "disabling interrupts failed\n");
949 goto err;
950 }
951 /* Set FIFO_CONTROL_REGISTER to the default value */
952 Data = 0x00;
953 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
954 if (status < 0) {
955 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
956 goto err;
957 }
958
959 Data = 0xcf;
960 status = mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
961 if (status < 0) {
962 dev_dbg(&port->dev, "Writing FIFO_CONTROL_REGISTER failed\n");
963 goto err;
964 }
965
966 Data = 0x03;
967 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
968 mos7840_port->shadowLCR = Data;
969
970 Data = 0x0b;
971 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
972 mos7840_port->shadowMCR = Data;
973
974 Data = 0x00;
975 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
976 mos7840_port->shadowLCR = Data;
977
978 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
979 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
980
981 Data = 0x0c;
982 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
983
984 Data = 0x0;
985 status = mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
986
987 Data = 0x00;
988 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
989
990 Data = Data & ~SERIAL_LCR_DLAB;
991 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
992 mos7840_port->shadowLCR = Data;
993
994 /* clearing Bulkin and Bulkout Fifo */
995 Data = 0x0;
996 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset, &Data);
997
998 Data = Data | 0x0c;
999 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1000
1001 Data = Data & ~0x0c;
1002 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset, Data);
1003 /* Finally enable all interrupts */
1004 Data = 0x0c;
1005 status = mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1006
1007 /* clearing rx_disable */
1008 Data = 0x0;
1009 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1010 &Data);
1011 Data = Data & ~0x20;
1012 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1013 Data);
1014
1015 /* rx_negate */
1016 Data = 0x0;
1017 status = mos7840_get_reg_sync(port, mos7840_port->ControlRegOffset,
1018 &Data);
1019 Data = Data | 0x10;
1020 status = mos7840_set_reg_sync(port, mos7840_port->ControlRegOffset,
1021 Data);
1022
1023 /* Check to see if we've set up our endpoint info yet *
1024 * (can't set it up in mos7840_startup as the structures *
1025 * were not set up at that time.) */
1026 if (port0->open_ports == 1) {
1027 if (serial->port[0]->interrupt_in_buffer == NULL) {
1028 /* set up interrupt urb */
1029 usb_fill_int_urb(serial->port[0]->interrupt_in_urb,
1030 serial->dev,
1031 usb_rcvintpipe(serial->dev,
1032 serial->port[0]->interrupt_in_endpointAddress),
1033 serial->port[0]->interrupt_in_buffer,
1034 serial->port[0]->interrupt_in_urb->
1035 transfer_buffer_length,
1036 mos7840_interrupt_callback,
1037 serial,
1038 serial->port[0]->interrupt_in_urb->interval);
1039
1040 /* start interrupt read for mos7840 *
1041 * will continue as long as mos7840 is connected */
1042
1043 response =
1044 usb_submit_urb(serial->port[0]->interrupt_in_urb,
1045 GFP_KERNEL);
1046 if (response) {
1047 dev_err(&port->dev, "%s - Error %d submitting "
1048 "interrupt urb\n", __func__, response);
1049 }
1050
1051 }
1052
1053 }
1054
1055 /* see if we've set up our endpoint info yet *
1056 * (can't set it up in mos7840_startup as the *
1057 * structures were not set up at that time.) */
1058
1059 dev_dbg(&port->dev, "port number is %d\n", port->port_number);
1060 dev_dbg(&port->dev, "minor number is %d\n", port->minor);
1061 dev_dbg(&port->dev, "Bulkin endpoint is %d\n", port->bulk_in_endpointAddress);
1062 dev_dbg(&port->dev, "BulkOut endpoint is %d\n", port->bulk_out_endpointAddress);
1063 dev_dbg(&port->dev, "Interrupt endpoint is %d\n", port->interrupt_in_endpointAddress);
1064 dev_dbg(&port->dev, "port's number in the device is %d\n", mos7840_port->port_num);
1065 mos7840_port->read_urb = port->read_urb;
1066
1067 /* set up our bulk in urb */
1068 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1069 usb_fill_bulk_urb(mos7840_port->read_urb,
1070 serial->dev,
1071 usb_rcvbulkpipe(serial->dev,
1072 (port->bulk_in_endpointAddress) + 2),
1073 port->bulk_in_buffer,
1074 mos7840_port->read_urb->transfer_buffer_length,
1075 mos7840_bulk_in_callback, mos7840_port);
1076 } else {
1077 usb_fill_bulk_urb(mos7840_port->read_urb,
1078 serial->dev,
1079 usb_rcvbulkpipe(serial->dev,
1080 port->bulk_in_endpointAddress),
1081 port->bulk_in_buffer,
1082 mos7840_port->read_urb->transfer_buffer_length,
1083 mos7840_bulk_in_callback, mos7840_port);
1084 }
1085
1086 dev_dbg(&port->dev, "%s: bulkin endpoint is %d\n", __func__, port->bulk_in_endpointAddress);
1087 mos7840_port->read_urb_busy = true;
1088 response = usb_submit_urb(mos7840_port->read_urb, GFP_KERNEL);
1089 if (response) {
1090 dev_err(&port->dev, "%s - Error %d submitting control urb\n",
1091 __func__, response);
1092 mos7840_port->read_urb_busy = false;
1093 }
1094
1095 /* initialize our port settings */
1096 /* Must set to enable ints! */
1097 mos7840_port->shadowMCR = MCR_MASTER_IE;
1098 /* send a open port command */
1099 mos7840_port->open = 1;
1100 /* mos7840_change_port_settings(mos7840_port,old_termios); */
1101
1102 return 0;
1103err:
1104 for (j = 0; j < NUM_URBS; ++j) {
1105 urb = mos7840_port->write_urb_pool[j];
1106 if (!urb)
1107 continue;
1108 kfree(urb->transfer_buffer);
1109 usb_free_urb(urb);
1110 }
1111 return status;
1112}
1113
1114/*****************************************************************************
1115 * mos7840_chars_in_buffer
1116 * this function is called by the tty driver when it wants to know how many
1117 * bytes of data we currently have outstanding in the port (data that has
1118 * been written, but hasn't made it out the port yet)
1119 * If successful, we return the number of bytes left to be written in the
1120 * system,
1121 * Otherwise we return zero.
1122 *****************************************************************************/
1123
1124static int mos7840_chars_in_buffer(struct tty_struct *tty)
1125{
1126 struct usb_serial_port *port = tty->driver_data;
1127 int i;
1128 int chars = 0;
1129 unsigned long flags;
1130 struct moschip_port *mos7840_port;
1131
1132 if (mos7840_port_paranoia_check(port, __func__))
1133 return 0;
1134
1135 mos7840_port = mos7840_get_port_private(port);
1136 if (mos7840_port == NULL)
1137 return 0;
1138
1139 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1140 for (i = 0; i < NUM_URBS; ++i) {
1141 if (mos7840_port->busy[i]) {
1142 struct urb *urb = mos7840_port->write_urb_pool[i];
1143 chars += urb->transfer_buffer_length;
1144 }
1145 }
1146 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1147 dev_dbg(&port->dev, "%s - returns %d\n", __func__, chars);
1148 return chars;
1149
1150}
1151
1152/*****************************************************************************
1153 * mos7840_close
1154 * this function is called by the tty driver when a port is closed
1155 *****************************************************************************/
1156
1157static void mos7840_close(struct usb_serial_port *port)
1158{
1159 struct usb_serial *serial;
1160 struct moschip_port *mos7840_port;
1161 struct moschip_port *port0;
1162 int j;
1163 __u16 Data;
1164
1165 if (mos7840_port_paranoia_check(port, __func__))
1166 return;
1167
1168 serial = mos7840_get_usb_serial(port, __func__);
1169 if (!serial)
1170 return;
1171
1172 mos7840_port = mos7840_get_port_private(port);
1173 port0 = mos7840_get_port_private(serial->port[0]);
1174
1175 if (mos7840_port == NULL || port0 == NULL)
1176 return;
1177
1178 for (j = 0; j < NUM_URBS; ++j)
1179 usb_kill_urb(mos7840_port->write_urb_pool[j]);
1180
1181 /* Freeing Write URBs */
1182 for (j = 0; j < NUM_URBS; ++j) {
1183 if (mos7840_port->write_urb_pool[j]) {
1184 if (mos7840_port->write_urb_pool[j]->transfer_buffer)
1185 kfree(mos7840_port->write_urb_pool[j]->
1186 transfer_buffer);
1187
1188 usb_free_urb(mos7840_port->write_urb_pool[j]);
1189 }
1190 }
1191
1192 usb_kill_urb(mos7840_port->write_urb);
1193 usb_kill_urb(mos7840_port->read_urb);
1194 mos7840_port->read_urb_busy = false;
1195
1196 port0->open_ports--;
1197 dev_dbg(&port->dev, "%s in close%d\n", __func__, port0->open_ports);
1198 if (port0->open_ports == 0) {
1199 if (serial->port[0]->interrupt_in_urb) {
1200 dev_dbg(&port->dev, "Shutdown interrupt_in_urb\n");
1201 usb_kill_urb(serial->port[0]->interrupt_in_urb);
1202 }
1203 }
1204
1205 if (mos7840_port->write_urb) {
1206 /* if this urb had a transfer buffer already (old tx) free it */
1207 kfree(mos7840_port->write_urb->transfer_buffer);
1208 usb_free_urb(mos7840_port->write_urb);
1209 }
1210
1211 Data = 0x0;
1212 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1213
1214 Data = 0x00;
1215 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1216
1217 mos7840_port->open = 0;
1218}
1219
1220/*****************************************************************************
1221 * mos7840_break
1222 * this function sends a break to the port
1223 *****************************************************************************/
1224static void mos7840_break(struct tty_struct *tty, int break_state)
1225{
1226 struct usb_serial_port *port = tty->driver_data;
1227 unsigned char data;
1228 struct usb_serial *serial;
1229 struct moschip_port *mos7840_port;
1230
1231 if (mos7840_port_paranoia_check(port, __func__))
1232 return;
1233
1234 serial = mos7840_get_usb_serial(port, __func__);
1235 if (!serial)
1236 return;
1237
1238 mos7840_port = mos7840_get_port_private(port);
1239
1240 if (mos7840_port == NULL)
1241 return;
1242
1243 if (break_state == -1)
1244 data = mos7840_port->shadowLCR | LCR_SET_BREAK;
1245 else
1246 data = mos7840_port->shadowLCR & ~LCR_SET_BREAK;
1247
1248 /* FIXME: no locking on shadowLCR anywhere in driver */
1249 mos7840_port->shadowLCR = data;
1250 dev_dbg(&port->dev, "%s mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1251 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER,
1252 mos7840_port->shadowLCR);
1253}
1254
1255/*****************************************************************************
1256 * mos7840_write_room
1257 * this function is called by the tty driver when it wants to know how many
1258 * bytes of data we can accept for a specific port.
1259 * If successful, we return the amount of room that we have for this port
1260 * Otherwise we return a negative error number.
1261 *****************************************************************************/
1262
1263static int mos7840_write_room(struct tty_struct *tty)
1264{
1265 struct usb_serial_port *port = tty->driver_data;
1266 int i;
1267 int room = 0;
1268 unsigned long flags;
1269 struct moschip_port *mos7840_port;
1270
1271 if (mos7840_port_paranoia_check(port, __func__))
1272 return -1;
1273
1274 mos7840_port = mos7840_get_port_private(port);
1275 if (mos7840_port == NULL)
1276 return -1;
1277
1278 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1279 for (i = 0; i < NUM_URBS; ++i) {
1280 if (!mos7840_port->busy[i])
1281 room += URB_TRANSFER_BUFFER_SIZE;
1282 }
1283 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1284
1285 room = (room == 0) ? 0 : room - URB_TRANSFER_BUFFER_SIZE + 1;
1286 dev_dbg(&mos7840_port->port->dev, "%s - returns %d\n", __func__, room);
1287 return room;
1288
1289}
1290
1291/*****************************************************************************
1292 * mos7840_write
1293 * this function is called by the tty driver when data should be written to
1294 * the port.
1295 * If successful, we return the number of bytes written, otherwise we
1296 * return a negative error number.
1297 *****************************************************************************/
1298
1299static int mos7840_write(struct tty_struct *tty, struct usb_serial_port *port,
1300 const unsigned char *data, int count)
1301{
1302 int status;
1303 int i;
1304 int bytes_sent = 0;
1305 int transfer_size;
1306 unsigned long flags;
1307
1308 struct moschip_port *mos7840_port;
1309 struct usb_serial *serial;
1310 struct urb *urb;
1311 /* __u16 Data; */
1312 const unsigned char *current_position = data;
1313 unsigned char *data1;
1314
1315#ifdef NOTMOS7840
1316 Data = 0x00;
1317 status = mos7840_get_uart_reg(port, LINE_CONTROL_REGISTER, &Data);
1318 mos7840_port->shadowLCR = Data;
1319 dev_dbg(&port->dev, "%s: LINE_CONTROL_REGISTER is %x\n", __func__, Data);
1320 dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1321
1322 /* Data = 0x03; */
1323 /* status = mos7840_set_uart_reg(port,LINE_CONTROL_REGISTER,Data); */
1324 /* mos7840_port->shadowLCR=Data;//Need to add later */
1325
1326 Data |= SERIAL_LCR_DLAB; /* data latch enable in LCR 0x80 */
1327 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1328
1329 /* Data = 0x0c; */
1330 /* status = mos7840_set_uart_reg(port,DIVISOR_LATCH_LSB,Data); */
1331 Data = 0x00;
1332 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_LSB, &Data);
1333 dev_dbg(&port->dev, "%s: DLL value is %x\n", __func__, Data);
1334
1335 Data = 0x0;
1336 status = mos7840_get_uart_reg(port, DIVISOR_LATCH_MSB, &Data);
1337 dev_dbg(&port->dev, "%s: DLM value is %x\n", __func__, Data);
1338
1339 Data = Data & ~SERIAL_LCR_DLAB;
1340 dev_dbg(&port->dev, "%s: mos7840_port->shadowLCR is %x\n", __func__, mos7840_port->shadowLCR);
1341 status = mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1342#endif
1343
1344 if (mos7840_port_paranoia_check(port, __func__))
1345 return -1;
1346
1347 serial = port->serial;
1348 if (mos7840_serial_paranoia_check(serial, __func__))
1349 return -1;
1350
1351 mos7840_port = mos7840_get_port_private(port);
1352 if (mos7840_port == NULL)
1353 return -1;
1354
1355 /* try to find a free urb in the list */
1356 urb = NULL;
1357
1358 spin_lock_irqsave(&mos7840_port->pool_lock, flags);
1359 for (i = 0; i < NUM_URBS; ++i) {
1360 if (!mos7840_port->busy[i]) {
1361 mos7840_port->busy[i] = 1;
1362 urb = mos7840_port->write_urb_pool[i];
1363 dev_dbg(&port->dev, "URB:%d\n", i);
1364 break;
1365 }
1366 }
1367 spin_unlock_irqrestore(&mos7840_port->pool_lock, flags);
1368
1369 if (urb == NULL) {
1370 dev_dbg(&port->dev, "%s - no more free urbs\n", __func__);
1371 goto exit;
1372 }
1373
1374 if (urb->transfer_buffer == NULL) {
1375 urb->transfer_buffer =
1376 kmalloc(URB_TRANSFER_BUFFER_SIZE, GFP_KERNEL);
1377 if (!urb->transfer_buffer)
1378 goto exit;
1379 }
1380 transfer_size = min(count, URB_TRANSFER_BUFFER_SIZE);
1381
1382 memcpy(urb->transfer_buffer, current_position, transfer_size);
1383
1384 /* fill urb with data and submit */
1385 if ((serial->num_ports == 2) && (((__u16)port->port_number % 2) != 0)) {
1386 usb_fill_bulk_urb(urb,
1387 serial->dev,
1388 usb_sndbulkpipe(serial->dev,
1389 (port->bulk_out_endpointAddress) + 2),
1390 urb->transfer_buffer,
1391 transfer_size,
1392 mos7840_bulk_out_data_callback, mos7840_port);
1393 } else {
1394 usb_fill_bulk_urb(urb,
1395 serial->dev,
1396 usb_sndbulkpipe(serial->dev,
1397 port->bulk_out_endpointAddress),
1398 urb->transfer_buffer,
1399 transfer_size,
1400 mos7840_bulk_out_data_callback, mos7840_port);
1401 }
1402
1403 data1 = urb->transfer_buffer;
1404 dev_dbg(&port->dev, "bulkout endpoint is %d\n", port->bulk_out_endpointAddress);
1405
1406 if (mos7840_port->has_led)
1407 mos7840_led_activity(port);
1408
1409 /* send it down the pipe */
1410 status = usb_submit_urb(urb, GFP_ATOMIC);
1411
1412 if (status) {
1413 mos7840_port->busy[i] = 0;
1414 dev_err_console(port, "%s - usb_submit_urb(write bulk) failed "
1415 "with status = %d\n", __func__, status);
1416 bytes_sent = status;
1417 goto exit;
1418 }
1419 bytes_sent = transfer_size;
1420 port->icount.tx += transfer_size;
1421 dev_dbg(&port->dev, "icount.tx is %d:\n", port->icount.tx);
1422exit:
1423 return bytes_sent;
1424
1425}
1426
1427/*****************************************************************************
1428 * mos7840_throttle
1429 * this function is called by the tty driver when it wants to stop the data
1430 * being read from the port.
1431 *****************************************************************************/
1432
1433static void mos7840_throttle(struct tty_struct *tty)
1434{
1435 struct usb_serial_port *port = tty->driver_data;
1436 struct moschip_port *mos7840_port;
1437 int status;
1438
1439 if (mos7840_port_paranoia_check(port, __func__))
1440 return;
1441
1442 mos7840_port = mos7840_get_port_private(port);
1443
1444 if (mos7840_port == NULL)
1445 return;
1446
1447 if (!mos7840_port->open) {
1448 dev_dbg(&port->dev, "%s", "port not opened\n");
1449 return;
1450 }
1451
1452 /* if we are implementing XON/XOFF, send the stop character */
1453 if (I_IXOFF(tty)) {
1454 unsigned char stop_char = STOP_CHAR(tty);
1455 status = mos7840_write(tty, port, &stop_char, 1);
1456 if (status <= 0)
1457 return;
1458 }
1459 /* if we are implementing RTS/CTS, toggle that line */
1460 if (tty->termios.c_cflag & CRTSCTS) {
1461 mos7840_port->shadowMCR &= ~MCR_RTS;
1462 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1463 mos7840_port->shadowMCR);
1464 if (status < 0)
1465 return;
1466 }
1467}
1468
1469/*****************************************************************************
1470 * mos7840_unthrottle
1471 * this function is called by the tty driver when it wants to resume
1472 * the data being read from the port (called after mos7840_throttle is
1473 * called)
1474 *****************************************************************************/
1475static void mos7840_unthrottle(struct tty_struct *tty)
1476{
1477 struct usb_serial_port *port = tty->driver_data;
1478 int status;
1479 struct moschip_port *mos7840_port = mos7840_get_port_private(port);
1480
1481 if (mos7840_port_paranoia_check(port, __func__))
1482 return;
1483
1484 if (mos7840_port == NULL)
1485 return;
1486
1487 if (!mos7840_port->open) {
1488 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1489 return;
1490 }
1491
1492 /* if we are implementing XON/XOFF, send the start character */
1493 if (I_IXOFF(tty)) {
1494 unsigned char start_char = START_CHAR(tty);
1495 status = mos7840_write(tty, port, &start_char, 1);
1496 if (status <= 0)
1497 return;
1498 }
1499
1500 /* if we are implementing RTS/CTS, toggle that line */
1501 if (tty->termios.c_cflag & CRTSCTS) {
1502 mos7840_port->shadowMCR |= MCR_RTS;
1503 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1504 mos7840_port->shadowMCR);
1505 if (status < 0)
1506 return;
1507 }
1508}
1509
1510static int mos7840_tiocmget(struct tty_struct *tty)
1511{
1512 struct usb_serial_port *port = tty->driver_data;
1513 struct moschip_port *mos7840_port;
1514 unsigned int result;
1515 __u16 msr;
1516 __u16 mcr;
1517 int status;
1518 mos7840_port = mos7840_get_port_private(port);
1519
1520 if (mos7840_port == NULL)
1521 return -ENODEV;
1522
1523 status = mos7840_get_uart_reg(port, MODEM_STATUS_REGISTER, &msr);
1524 if (status != 1)
1525 return -EIO;
1526 status = mos7840_get_uart_reg(port, MODEM_CONTROL_REGISTER, &mcr);
1527 if (status != 1)
1528 return -EIO;
1529 result = ((mcr & MCR_DTR) ? TIOCM_DTR : 0)
1530 | ((mcr & MCR_RTS) ? TIOCM_RTS : 0)
1531 | ((mcr & MCR_LOOPBACK) ? TIOCM_LOOP : 0)
1532 | ((msr & MOS7840_MSR_CTS) ? TIOCM_CTS : 0)
1533 | ((msr & MOS7840_MSR_CD) ? TIOCM_CAR : 0)
1534 | ((msr & MOS7840_MSR_RI) ? TIOCM_RI : 0)
1535 | ((msr & MOS7840_MSR_DSR) ? TIOCM_DSR : 0);
1536
1537 dev_dbg(&port->dev, "%s - 0x%04X\n", __func__, result);
1538
1539 return result;
1540}
1541
1542static int mos7840_tiocmset(struct tty_struct *tty,
1543 unsigned int set, unsigned int clear)
1544{
1545 struct usb_serial_port *port = tty->driver_data;
1546 struct moschip_port *mos7840_port;
1547 unsigned int mcr;
1548 int status;
1549
1550 mos7840_port = mos7840_get_port_private(port);
1551
1552 if (mos7840_port == NULL)
1553 return -ENODEV;
1554
1555 /* FIXME: What locks the port registers ? */
1556 mcr = mos7840_port->shadowMCR;
1557 if (clear & TIOCM_RTS)
1558 mcr &= ~MCR_RTS;
1559 if (clear & TIOCM_DTR)
1560 mcr &= ~MCR_DTR;
1561 if (clear & TIOCM_LOOP)
1562 mcr &= ~MCR_LOOPBACK;
1563
1564 if (set & TIOCM_RTS)
1565 mcr |= MCR_RTS;
1566 if (set & TIOCM_DTR)
1567 mcr |= MCR_DTR;
1568 if (set & TIOCM_LOOP)
1569 mcr |= MCR_LOOPBACK;
1570
1571 mos7840_port->shadowMCR = mcr;
1572
1573 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, mcr);
1574 if (status < 0) {
1575 dev_dbg(&port->dev, "setting MODEM_CONTROL_REGISTER Failed\n");
1576 return status;
1577 }
1578
1579 return 0;
1580}
1581
1582/*****************************************************************************
1583 * mos7840_calc_baud_rate_divisor
1584 * this function calculates the proper baud rate divisor for the specified
1585 * baud rate.
1586 *****************************************************************************/
1587static int mos7840_calc_baud_rate_divisor(struct usb_serial_port *port,
1588 int baudRate, int *divisor,
1589 __u16 *clk_sel_val)
1590{
1591 dev_dbg(&port->dev, "%s - %d\n", __func__, baudRate);
1592
1593 if (baudRate <= 115200) {
1594 *divisor = 115200 / baudRate;
1595 *clk_sel_val = 0x0;
1596 }
1597 if ((baudRate > 115200) && (baudRate <= 230400)) {
1598 *divisor = 230400 / baudRate;
1599 *clk_sel_val = 0x10;
1600 } else if ((baudRate > 230400) && (baudRate <= 403200)) {
1601 *divisor = 403200 / baudRate;
1602 *clk_sel_val = 0x20;
1603 } else if ((baudRate > 403200) && (baudRate <= 460800)) {
1604 *divisor = 460800 / baudRate;
1605 *clk_sel_val = 0x30;
1606 } else if ((baudRate > 460800) && (baudRate <= 806400)) {
1607 *divisor = 806400 / baudRate;
1608 *clk_sel_val = 0x40;
1609 } else if ((baudRate > 806400) && (baudRate <= 921600)) {
1610 *divisor = 921600 / baudRate;
1611 *clk_sel_val = 0x50;
1612 } else if ((baudRate > 921600) && (baudRate <= 1572864)) {
1613 *divisor = 1572864 / baudRate;
1614 *clk_sel_val = 0x60;
1615 } else if ((baudRate > 1572864) && (baudRate <= 3145728)) {
1616 *divisor = 3145728 / baudRate;
1617 *clk_sel_val = 0x70;
1618 }
1619 return 0;
1620
1621#ifdef NOTMCS7840
1622
1623 for (i = 0; i < ARRAY_SIZE(mos7840_divisor_table); i++) {
1624 if (mos7840_divisor_table[i].BaudRate == baudrate) {
1625 *divisor = mos7840_divisor_table[i].Divisor;
1626 return 0;
1627 }
1628 }
1629
1630 /* After trying for all the standard baud rates *
1631 * Try calculating the divisor for this baud rate */
1632
1633 if (baudrate > 75 && baudrate < 230400) {
1634 /* get the divisor */
1635 custom = (__u16) (230400L / baudrate);
1636
1637 /* Check for round off */
1638 round1 = (__u16) (2304000L / baudrate);
1639 round = (__u16) (round1 - (custom * 10));
1640 if (round > 4)
1641 custom++;
1642 *divisor = custom;
1643
1644 dev_dbg(&port->dev, " Baud %d = %d\n", baudrate, custom);
1645 return 0;
1646 }
1647
1648 dev_dbg(&port->dev, "%s", " Baud calculation Failed...\n");
1649 return -1;
1650#endif
1651}
1652
1653/*****************************************************************************
1654 * mos7840_send_cmd_write_baud_rate
1655 * this function sends the proper command to change the baud rate of the
1656 * specified port.
1657 *****************************************************************************/
1658
1659static int mos7840_send_cmd_write_baud_rate(struct moschip_port *mos7840_port,
1660 int baudRate)
1661{
1662 int divisor = 0;
1663 int status;
1664 __u16 Data;
1665 unsigned char number;
1666 __u16 clk_sel_val;
1667 struct usb_serial_port *port;
1668
1669 if (mos7840_port == NULL)
1670 return -1;
1671
1672 port = mos7840_port->port;
1673 if (mos7840_port_paranoia_check(port, __func__))
1674 return -1;
1675
1676 if (mos7840_serial_paranoia_check(port->serial, __func__))
1677 return -1;
1678
1679 number = mos7840_port->port->port_number;
1680
1681 dev_dbg(&port->dev, "%s - baud = %d\n", __func__, baudRate);
1682 /* reset clk_uart_sel in spregOffset */
1683 if (baudRate > 115200) {
1684#ifdef HW_flow_control
1685 /* NOTE: need to see the pther register to modify */
1686 /* setting h/w flow control bit to 1 */
1687 Data = 0x2b;
1688 mos7840_port->shadowMCR = Data;
1689 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1690 Data);
1691 if (status < 0) {
1692 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1693 return -1;
1694 }
1695#endif
1696
1697 } else {
1698#ifdef HW_flow_control
1699 /* setting h/w flow control bit to 0 */
1700 Data = 0xb;
1701 mos7840_port->shadowMCR = Data;
1702 status = mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER,
1703 Data);
1704 if (status < 0) {
1705 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1706 return -1;
1707 }
1708#endif
1709
1710 }
1711
1712 if (1) { /* baudRate <= 115200) */
1713 clk_sel_val = 0x0;
1714 Data = 0x0;
1715 status = mos7840_calc_baud_rate_divisor(port, baudRate, &divisor,
1716 &clk_sel_val);
1717 status = mos7840_get_reg_sync(port, mos7840_port->SpRegOffset,
1718 &Data);
1719 if (status < 0) {
1720 dev_dbg(&port->dev, "reading spreg failed in set_serial_baud\n");
1721 return -1;
1722 }
1723 Data = (Data & 0x8f) | clk_sel_val;
1724 status = mos7840_set_reg_sync(port, mos7840_port->SpRegOffset,
1725 Data);
1726 if (status < 0) {
1727 dev_dbg(&port->dev, "Writing spreg failed in set_serial_baud\n");
1728 return -1;
1729 }
1730 /* Calculate the Divisor */
1731
1732 if (status) {
1733 dev_err(&port->dev, "%s - bad baud rate\n", __func__);
1734 return status;
1735 }
1736 /* Enable access to divisor latch */
1737 Data = mos7840_port->shadowLCR | SERIAL_LCR_DLAB;
1738 mos7840_port->shadowLCR = Data;
1739 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1740
1741 /* Write the divisor */
1742 Data = (unsigned char)(divisor & 0xff);
1743 dev_dbg(&port->dev, "set_serial_baud Value to write DLL is %x\n", Data);
1744 mos7840_set_uart_reg(port, DIVISOR_LATCH_LSB, Data);
1745
1746 Data = (unsigned char)((divisor & 0xff00) >> 8);
1747 dev_dbg(&port->dev, "set_serial_baud Value to write DLM is %x\n", Data);
1748 mos7840_set_uart_reg(port, DIVISOR_LATCH_MSB, Data);
1749
1750 /* Disable access to divisor latch */
1751 Data = mos7840_port->shadowLCR & ~SERIAL_LCR_DLAB;
1752 mos7840_port->shadowLCR = Data;
1753 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1754
1755 }
1756 return status;
1757}
1758
1759/*****************************************************************************
1760 * mos7840_change_port_settings
1761 * This routine is called to set the UART on the device to match
1762 * the specified new settings.
1763 *****************************************************************************/
1764
1765static void mos7840_change_port_settings(struct tty_struct *tty,
1766 struct moschip_port *mos7840_port, struct ktermios *old_termios)
1767{
1768 int baud;
1769 unsigned cflag;
1770 unsigned iflag;
1771 __u8 lData;
1772 __u8 lParity;
1773 __u8 lStop;
1774 int status;
1775 __u16 Data;
1776 struct usb_serial_port *port;
1777 struct usb_serial *serial;
1778
1779 if (mos7840_port == NULL)
1780 return;
1781
1782 port = mos7840_port->port;
1783
1784 if (mos7840_port_paranoia_check(port, __func__))
1785 return;
1786
1787 if (mos7840_serial_paranoia_check(port->serial, __func__))
1788 return;
1789
1790 serial = port->serial;
1791
1792 if (!mos7840_port->open) {
1793 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1794 return;
1795 }
1796
1797 lData = LCR_BITS_8;
1798 lStop = LCR_STOP_1;
1799 lParity = LCR_PAR_NONE;
1800
1801 cflag = tty->termios.c_cflag;
1802 iflag = tty->termios.c_iflag;
1803
1804 /* Change the number of bits */
1805 switch (cflag & CSIZE) {
1806 case CS5:
1807 lData = LCR_BITS_5;
1808 break;
1809
1810 case CS6:
1811 lData = LCR_BITS_6;
1812 break;
1813
1814 case CS7:
1815 lData = LCR_BITS_7;
1816 break;
1817
1818 default:
1819 case CS8:
1820 lData = LCR_BITS_8;
1821 break;
1822 }
1823
1824 /* Change the Parity bit */
1825 if (cflag & PARENB) {
1826 if (cflag & PARODD) {
1827 lParity = LCR_PAR_ODD;
1828 dev_dbg(&port->dev, "%s - parity = odd\n", __func__);
1829 } else {
1830 lParity = LCR_PAR_EVEN;
1831 dev_dbg(&port->dev, "%s - parity = even\n", __func__);
1832 }
1833
1834 } else {
1835 dev_dbg(&port->dev, "%s - parity = none\n", __func__);
1836 }
1837
1838 if (cflag & CMSPAR)
1839 lParity = lParity | 0x20;
1840
1841 /* Change the Stop bit */
1842 if (cflag & CSTOPB) {
1843 lStop = LCR_STOP_2;
1844 dev_dbg(&port->dev, "%s - stop bits = 2\n", __func__);
1845 } else {
1846 lStop = LCR_STOP_1;
1847 dev_dbg(&port->dev, "%s - stop bits = 1\n", __func__);
1848 }
1849
1850 /* Update the LCR with the correct value */
1851 mos7840_port->shadowLCR &=
1852 ~(LCR_BITS_MASK | LCR_STOP_MASK | LCR_PAR_MASK);
1853 mos7840_port->shadowLCR |= (lData | lParity | lStop);
1854
1855 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is %x\n", __func__,
1856 mos7840_port->shadowLCR);
1857 /* Disable Interrupts */
1858 Data = 0x00;
1859 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1860
1861 Data = 0x00;
1862 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1863
1864 Data = 0xcf;
1865 mos7840_set_uart_reg(port, FIFO_CONTROL_REGISTER, Data);
1866
1867 /* Send the updated LCR value to the mos7840 */
1868 Data = mos7840_port->shadowLCR;
1869
1870 mos7840_set_uart_reg(port, LINE_CONTROL_REGISTER, Data);
1871
1872 Data = 0x00b;
1873 mos7840_port->shadowMCR = Data;
1874 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1875 Data = 0x00b;
1876 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1877
1878 /* set up the MCR register and send it to the mos7840 */
1879
1880 mos7840_port->shadowMCR = MCR_MASTER_IE;
1881 if (cflag & CBAUD)
1882 mos7840_port->shadowMCR |= (MCR_DTR | MCR_RTS);
1883
1884 if (cflag & CRTSCTS)
1885 mos7840_port->shadowMCR |= (MCR_XON_ANY);
1886 else
1887 mos7840_port->shadowMCR &= ~(MCR_XON_ANY);
1888
1889 Data = mos7840_port->shadowMCR;
1890 mos7840_set_uart_reg(port, MODEM_CONTROL_REGISTER, Data);
1891
1892 /* Determine divisor based on baud rate */
1893 baud = tty_get_baud_rate(tty);
1894
1895 if (!baud) {
1896 /* pick a default, any default... */
1897 dev_dbg(&port->dev, "%s", "Picked default baud...\n");
1898 baud = 9600;
1899 }
1900
1901 dev_dbg(&port->dev, "%s - baud rate = %d\n", __func__, baud);
1902 status = mos7840_send_cmd_write_baud_rate(mos7840_port, baud);
1903
1904 /* Enable Interrupts */
1905 Data = 0x0c;
1906 mos7840_set_uart_reg(port, INTERRUPT_ENABLE_REGISTER, Data);
1907
1908 if (mos7840_port->read_urb_busy == false) {
1909 mos7840_port->read_urb_busy = true;
1910 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
1911 if (status) {
1912 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1913 status);
1914 mos7840_port->read_urb_busy = false;
1915 }
1916 }
1917 dev_dbg(&port->dev, "%s - mos7840_port->shadowLCR is End %x\n", __func__,
1918 mos7840_port->shadowLCR);
1919}
1920
1921/*****************************************************************************
1922 * mos7840_set_termios
1923 * this function is called by the tty driver when it wants to change
1924 * the termios structure
1925 *****************************************************************************/
1926
1927static void mos7840_set_termios(struct tty_struct *tty,
1928 struct usb_serial_port *port,
1929 struct ktermios *old_termios)
1930{
1931 int status;
1932 unsigned int cflag;
1933 struct usb_serial *serial;
1934 struct moschip_port *mos7840_port;
1935
1936 if (mos7840_port_paranoia_check(port, __func__))
1937 return;
1938
1939 serial = port->serial;
1940
1941 if (mos7840_serial_paranoia_check(serial, __func__))
1942 return;
1943
1944 mos7840_port = mos7840_get_port_private(port);
1945
1946 if (mos7840_port == NULL)
1947 return;
1948
1949 if (!mos7840_port->open) {
1950 dev_dbg(&port->dev, "%s - port not opened\n", __func__);
1951 return;
1952 }
1953
1954 dev_dbg(&port->dev, "%s", "setting termios - \n");
1955
1956 cflag = tty->termios.c_cflag;
1957
1958 dev_dbg(&port->dev, "%s - clfag %08x iflag %08x\n", __func__,
1959 tty->termios.c_cflag, RELEVANT_IFLAG(tty->termios.c_iflag));
1960 dev_dbg(&port->dev, "%s - old clfag %08x old iflag %08x\n", __func__,
1961 old_termios->c_cflag, RELEVANT_IFLAG(old_termios->c_iflag));
1962
1963 /* change the port settings to the new ones specified */
1964
1965 mos7840_change_port_settings(tty, mos7840_port, old_termios);
1966
1967 if (!mos7840_port->read_urb) {
1968 dev_dbg(&port->dev, "%s", "URB KILLED !!!!!\n");
1969 return;
1970 }
1971
1972 if (mos7840_port->read_urb_busy == false) {
1973 mos7840_port->read_urb_busy = true;
1974 status = usb_submit_urb(mos7840_port->read_urb, GFP_ATOMIC);
1975 if (status) {
1976 dev_dbg(&port->dev, "usb_submit_urb(read bulk) failed, status = %d\n",
1977 status);
1978 mos7840_port->read_urb_busy = false;
1979 }
1980 }
1981}
1982
1983/*****************************************************************************
1984 * mos7840_get_lsr_info - get line status register info
1985 *
1986 * Purpose: Let user call ioctl() to get info when the UART physically
1987 * is emptied. On bus types like RS485, the transmitter must
1988 * release the bus after transmitting. This must be done when
1989 * the transmit shift register is empty, not be done when the
1990 * transmit holding register is empty. This functionality
1991 * allows an RS485 driver to be written in user space.
1992 *****************************************************************************/
1993
1994static int mos7840_get_lsr_info(struct tty_struct *tty,
1995 unsigned int __user *value)
1996{
1997 int count;
1998 unsigned int result = 0;
1999
2000 count = mos7840_chars_in_buffer(tty);
2001 if (count == 0)
2002 result = TIOCSER_TEMT;
2003
2004 if (copy_to_user(value, &result, sizeof(int)))
2005 return -EFAULT;
2006 return 0;
2007}
2008
2009/*****************************************************************************
2010 * mos7840_get_serial_info
2011 * function to get information about serial port
2012 *****************************************************************************/
2013
2014static int mos7840_get_serial_info(struct moschip_port *mos7840_port,
2015 struct serial_struct __user *retinfo)
2016{
2017 struct serial_struct tmp;
2018
2019 if (mos7840_port == NULL)
2020 return -1;
2021
2022 if (!retinfo)
2023 return -EFAULT;
2024
2025 memset(&tmp, 0, sizeof(tmp));
2026
2027 tmp.type = PORT_16550A;
2028 tmp.line = mos7840_port->port->minor;
2029 tmp.port = mos7840_port->port->port_number;
2030 tmp.irq = 0;
2031 tmp.flags = ASYNC_SKIP_TEST | ASYNC_AUTO_IRQ;
2032 tmp.xmit_fifo_size = NUM_URBS * URB_TRANSFER_BUFFER_SIZE;
2033 tmp.baud_base = 9600;
2034 tmp.close_delay = 5 * HZ;
2035 tmp.closing_wait = 30 * HZ;
2036
2037 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
2038 return -EFAULT;
2039 return 0;
2040}
2041
2042/*****************************************************************************
2043 * SerialIoctl
2044 * this function handles any ioctl calls to the driver
2045 *****************************************************************************/
2046
2047static int mos7840_ioctl(struct tty_struct *tty,
2048 unsigned int cmd, unsigned long arg)
2049{
2050 struct usb_serial_port *port = tty->driver_data;
2051 void __user *argp = (void __user *)arg;
2052 struct moschip_port *mos7840_port;
2053
2054 if (mos7840_port_paranoia_check(port, __func__))
2055 return -1;
2056
2057 mos7840_port = mos7840_get_port_private(port);
2058
2059 if (mos7840_port == NULL)
2060 return -1;
2061
2062 switch (cmd) {
2063 /* return number of bytes available */
2064
2065 case TIOCSERGETLSR:
2066 dev_dbg(&port->dev, "%s TIOCSERGETLSR\n", __func__);
2067 return mos7840_get_lsr_info(tty, argp);
2068
2069 case TIOCGSERIAL:
2070 dev_dbg(&port->dev, "%s TIOCGSERIAL\n", __func__);
2071 return mos7840_get_serial_info(mos7840_port, argp);
2072
2073 case TIOCSSERIAL:
2074 dev_dbg(&port->dev, "%s TIOCSSERIAL\n", __func__);
2075 break;
2076 default:
2077 break;
2078 }
2079 return -ENOIOCTLCMD;
2080}
2081
2082static int mos7810_check(struct usb_serial *serial)
2083{
2084 int i, pass_count = 0;
2085 u8 *buf;
2086 __u16 data = 0, mcr_data = 0;
2087 __u16 test_pattern = 0x55AA;
2088 int res;
2089
2090 buf = kmalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2091 if (!buf)
2092 return 0; /* failed to identify 7810 */
2093
2094 /* Store MCR setting */
2095 res = usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2096 MCS_RDREQ, MCS_RD_RTYPE, 0x0300, MODEM_CONTROL_REGISTER,
2097 buf, VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2098 if (res == VENDOR_READ_LENGTH)
2099 mcr_data = *buf;
2100
2101 for (i = 0; i < 16; i++) {
2102 /* Send the 1-bit test pattern out to MCS7810 test pin */
2103 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2104 MCS_WRREQ, MCS_WR_RTYPE,
2105 (0x0300 | (((test_pattern >> i) & 0x0001) << 1)),
2106 MODEM_CONTROL_REGISTER, NULL, 0, MOS_WDR_TIMEOUT);
2107
2108 /* Read the test pattern back */
2109 res = usb_control_msg(serial->dev,
2110 usb_rcvctrlpipe(serial->dev, 0), MCS_RDREQ,
2111 MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2112 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2113 if (res == VENDOR_READ_LENGTH)
2114 data = *buf;
2115
2116 /* If this is a MCS7810 device, both test patterns must match */
2117 if (((test_pattern >> i) ^ (~data >> 1)) & 0x0001)
2118 break;
2119
2120 pass_count++;
2121 }
2122
2123 /* Restore MCR setting */
2124 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0), MCS_WRREQ,
2125 MCS_WR_RTYPE, 0x0300 | mcr_data, MODEM_CONTROL_REGISTER, NULL,
2126 0, MOS_WDR_TIMEOUT);
2127
2128 kfree(buf);
2129
2130 if (pass_count == 16)
2131 return 1;
2132
2133 return 0;
2134}
2135
2136static int mos7840_probe(struct usb_serial *serial,
2137 const struct usb_device_id *id)
2138{
2139 u16 product = le16_to_cpu(serial->dev->descriptor.idProduct);
2140 u8 *buf;
2141 int device_type;
2142
2143 if (product == MOSCHIP_DEVICE_ID_7810 ||
2144 product == MOSCHIP_DEVICE_ID_7820) {
2145 device_type = product;
2146 goto out;
2147 }
2148
2149 buf = kzalloc(VENDOR_READ_LENGTH, GFP_KERNEL);
2150 if (!buf)
2151 return -ENOMEM;
2152
2153 usb_control_msg(serial->dev, usb_rcvctrlpipe(serial->dev, 0),
2154 MCS_RDREQ, MCS_RD_RTYPE, 0, GPIO_REGISTER, buf,
2155 VENDOR_READ_LENGTH, MOS_WDR_TIMEOUT);
2156
2157 /* For a MCS7840 device GPIO0 must be set to 1 */
2158 if (buf[0] & 0x01)
2159 device_type = MOSCHIP_DEVICE_ID_7840;
2160 else if (mos7810_check(serial))
2161 device_type = MOSCHIP_DEVICE_ID_7810;
2162 else
2163 device_type = MOSCHIP_DEVICE_ID_7820;
2164
2165 kfree(buf);
2166out:
2167 usb_set_serial_data(serial, (void *)(unsigned long)device_type);
2168
2169 return 0;
2170}
2171
2172static int mos7840_calc_num_ports(struct usb_serial *serial)
2173{
2174 int device_type = (unsigned long)usb_get_serial_data(serial);
2175 int mos7840_num_ports;
2176
2177 mos7840_num_ports = (device_type >> 4) & 0x000F;
2178
2179 return mos7840_num_ports;
2180}
2181
2182static int mos7840_port_probe(struct usb_serial_port *port)
2183{
2184 struct usb_serial *serial = port->serial;
2185 int device_type = (unsigned long)usb_get_serial_data(serial);
2186 struct moschip_port *mos7840_port;
2187 int status;
2188 int pnum;
2189 __u16 Data;
2190
2191 /* we set up the pointers to the endpoints in the mos7840_open *
2192 * function, as the structures aren't created yet. */
2193
2194 pnum = port->port_number;
2195
2196 dev_dbg(&port->dev, "mos7840_startup: configuring port %d\n", pnum);
2197 mos7840_port = kzalloc(sizeof(struct moschip_port), GFP_KERNEL);
2198 if (!mos7840_port)
2199 return -ENOMEM;
2200
2201 /* Initialize all port interrupt end point to port 0 int
2202 * endpoint. Our device has only one interrupt end point
2203 * common to all port */
2204
2205 mos7840_port->port = port;
2206 mos7840_set_port_private(port, mos7840_port);
2207 spin_lock_init(&mos7840_port->pool_lock);
2208
2209 /* minor is not initialised until later by
2210 * usb-serial.c:get_free_serial() and cannot therefore be used
2211 * to index device instances */
2212 mos7840_port->port_num = pnum + 1;
2213 dev_dbg(&port->dev, "port->minor = %d\n", port->minor);
2214 dev_dbg(&port->dev, "mos7840_port->port_num = %d\n", mos7840_port->port_num);
2215
2216 if (mos7840_port->port_num == 1) {
2217 mos7840_port->SpRegOffset = 0x0;
2218 mos7840_port->ControlRegOffset = 0x1;
2219 mos7840_port->DcrRegOffset = 0x4;
2220 } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 4)) {
2221 mos7840_port->SpRegOffset = 0x8;
2222 mos7840_port->ControlRegOffset = 0x9;
2223 mos7840_port->DcrRegOffset = 0x16;
2224 } else if ((mos7840_port->port_num == 2) && (serial->num_ports == 2)) {
2225 mos7840_port->SpRegOffset = 0xa;
2226 mos7840_port->ControlRegOffset = 0xb;
2227 mos7840_port->DcrRegOffset = 0x19;
2228 } else if ((mos7840_port->port_num == 3) && (serial->num_ports == 4)) {
2229 mos7840_port->SpRegOffset = 0xa;
2230 mos7840_port->ControlRegOffset = 0xb;
2231 mos7840_port->DcrRegOffset = 0x19;
2232 } else if ((mos7840_port->port_num == 4) && (serial->num_ports == 4)) {
2233 mos7840_port->SpRegOffset = 0xc;
2234 mos7840_port->ControlRegOffset = 0xd;
2235 mos7840_port->DcrRegOffset = 0x1c;
2236 }
2237 mos7840_dump_serial_port(port, mos7840_port);
2238 mos7840_set_port_private(port, mos7840_port);
2239
2240 /* enable rx_disable bit in control register */
2241 status = mos7840_get_reg_sync(port,
2242 mos7840_port->ControlRegOffset, &Data);
2243 if (status < 0) {
2244 dev_dbg(&port->dev, "Reading ControlReg failed status-0x%x\n", status);
2245 goto out;
2246 } else
2247 dev_dbg(&port->dev, "ControlReg Reading success val is %x, status%d\n", Data, status);
2248 Data |= 0x08; /* setting driver done bit */
2249 Data |= 0x04; /* sp1_bit to have cts change reflect in
2250 modem status reg */
2251
2252 /* Data |= 0x20; //rx_disable bit */
2253 status = mos7840_set_reg_sync(port,
2254 mos7840_port->ControlRegOffset, Data);
2255 if (status < 0) {
2256 dev_dbg(&port->dev, "Writing ControlReg failed(rx_disable) status-0x%x\n", status);
2257 goto out;
2258 } else
2259 dev_dbg(&port->dev, "ControlReg Writing success(rx_disable) status%d\n", status);
2260
2261 /* Write default values in DCR (i.e 0x01 in DCR0, 0x05 in DCR2
2262 and 0x24 in DCR3 */
2263 Data = 0x01;
2264 status = mos7840_set_reg_sync(port,
2265 (__u16) (mos7840_port->DcrRegOffset + 0), Data);
2266 if (status < 0) {
2267 dev_dbg(&port->dev, "Writing DCR0 failed status-0x%x\n", status);
2268 goto out;
2269 } else
2270 dev_dbg(&port->dev, "DCR0 Writing success status%d\n", status);
2271
2272 Data = 0x05;
2273 status = mos7840_set_reg_sync(port,
2274 (__u16) (mos7840_port->DcrRegOffset + 1), Data);
2275 if (status < 0) {
2276 dev_dbg(&port->dev, "Writing DCR1 failed status-0x%x\n", status);
2277 goto out;
2278 } else
2279 dev_dbg(&port->dev, "DCR1 Writing success status%d\n", status);
2280
2281 Data = 0x24;
2282 status = mos7840_set_reg_sync(port,
2283 (__u16) (mos7840_port->DcrRegOffset + 2), Data);
2284 if (status < 0) {
2285 dev_dbg(&port->dev, "Writing DCR2 failed status-0x%x\n", status);
2286 goto out;
2287 } else
2288 dev_dbg(&port->dev, "DCR2 Writing success status%d\n", status);
2289
2290 /* write values in clkstart0x0 and clkmulti 0x20 */
2291 Data = 0x0;
2292 status = mos7840_set_reg_sync(port, CLK_START_VALUE_REGISTER, Data);
2293 if (status < 0) {
2294 dev_dbg(&port->dev, "Writing CLK_START_VALUE_REGISTER failed status-0x%x\n", status);
2295 goto out;
2296 } else
2297 dev_dbg(&port->dev, "CLK_START_VALUE_REGISTER Writing success status%d\n", status);
2298
2299 Data = 0x20;
2300 status = mos7840_set_reg_sync(port, CLK_MULTI_REGISTER, Data);
2301 if (status < 0) {
2302 dev_dbg(&port->dev, "Writing CLK_MULTI_REGISTER failed status-0x%x\n", status);
2303 goto error;
2304 } else
2305 dev_dbg(&port->dev, "CLK_MULTI_REGISTER Writing success status%d\n", status);
2306
2307 /* write value 0x0 to scratchpad register */
2308 Data = 0x00;
2309 status = mos7840_set_uart_reg(port, SCRATCH_PAD_REGISTER, Data);
2310 if (status < 0) {
2311 dev_dbg(&port->dev, "Writing SCRATCH_PAD_REGISTER failed status-0x%x\n", status);
2312 goto out;
2313 } else
2314 dev_dbg(&port->dev, "SCRATCH_PAD_REGISTER Writing success status%d\n", status);
2315
2316 /* Zero Length flag register */
2317 if ((mos7840_port->port_num != 1) && (serial->num_ports == 2)) {
2318 Data = 0xff;
2319 status = mos7840_set_reg_sync(port,
2320 (__u16) (ZLP_REG1 +
2321 ((__u16)mos7840_port->port_num)), Data);
2322 dev_dbg(&port->dev, "ZLIP offset %x\n",
2323 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num)));
2324 if (status < 0) {
2325 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 2, status);
2326 goto out;
2327 } else
2328 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 2, status);
2329 } else {
2330 Data = 0xff;
2331 status = mos7840_set_reg_sync(port,
2332 (__u16) (ZLP_REG1 +
2333 ((__u16)mos7840_port->port_num) - 0x1), Data);
2334 dev_dbg(&port->dev, "ZLIP offset %x\n",
2335 (__u16)(ZLP_REG1 + ((__u16) mos7840_port->port_num) - 0x1));
2336 if (status < 0) {
2337 dev_dbg(&port->dev, "Writing ZLP_REG%d failed status-0x%x\n", pnum + 1, status);
2338 goto out;
2339 } else
2340 dev_dbg(&port->dev, "ZLP_REG%d Writing success status%d\n", pnum + 1, status);
2341
2342 }
2343 mos7840_port->control_urb = usb_alloc_urb(0, GFP_KERNEL);
2344 mos7840_port->ctrl_buf = kmalloc(16, GFP_KERNEL);
2345 mos7840_port->dr = kmalloc(sizeof(struct usb_ctrlrequest),
2346 GFP_KERNEL);
2347 if (!mos7840_port->control_urb || !mos7840_port->ctrl_buf ||
2348 !mos7840_port->dr) {
2349 status = -ENOMEM;
2350 goto error;
2351 }
2352
2353 mos7840_port->has_led = false;
2354
2355 /* Initialize LED timers */
2356 if (device_type == MOSCHIP_DEVICE_ID_7810) {
2357 mos7840_port->has_led = true;
2358
2359 mos7840_port->led_urb = usb_alloc_urb(0, GFP_KERNEL);
2360 mos7840_port->led_dr = kmalloc(sizeof(*mos7840_port->led_dr),
2361 GFP_KERNEL);
2362 if (!mos7840_port->led_urb || !mos7840_port->led_dr) {
2363 status = -ENOMEM;
2364 goto error;
2365 }
2366
2367 init_timer(&mos7840_port->led_timer1);
2368 mos7840_port->led_timer1.function = mos7840_led_off;
2369 mos7840_port->led_timer1.expires =
2370 jiffies + msecs_to_jiffies(LED_ON_MS);
2371 mos7840_port->led_timer1.data = (unsigned long)mos7840_port;
2372
2373 init_timer(&mos7840_port->led_timer2);
2374 mos7840_port->led_timer2.function = mos7840_led_flag_off;
2375 mos7840_port->led_timer2.expires =
2376 jiffies + msecs_to_jiffies(LED_OFF_MS);
2377 mos7840_port->led_timer2.data = (unsigned long)mos7840_port;
2378
2379 /* Turn off LED */
2380 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2381 }
2382out:
2383 if (pnum == serial->num_ports - 1) {
2384 /* Zero Length flag enable */
2385 Data = 0x0f;
2386 status = mos7840_set_reg_sync(serial->port[0], ZLP_REG5, Data);
2387 if (status < 0) {
2388 dev_dbg(&port->dev, "Writing ZLP_REG5 failed status-0x%x\n", status);
2389 goto error;
2390 } else
2391 dev_dbg(&port->dev, "ZLP_REG5 Writing success status%d\n", status);
2392
2393 /* setting configuration feature to one */
2394 usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
2395 0x03, 0x00, 0x01, 0x00, NULL, 0x00,
2396 MOS_WDR_TIMEOUT);
2397 }
2398 return 0;
2399error:
2400 kfree(mos7840_port->led_dr);
2401 usb_free_urb(mos7840_port->led_urb);
2402 kfree(mos7840_port->dr);
2403 kfree(mos7840_port->ctrl_buf);
2404 usb_free_urb(mos7840_port->control_urb);
2405 kfree(mos7840_port);
2406
2407 return status;
2408}
2409
2410static int mos7840_port_remove(struct usb_serial_port *port)
2411{
2412 struct moschip_port *mos7840_port;
2413
2414 mos7840_port = mos7840_get_port_private(port);
2415
2416 if (mos7840_port->has_led) {
2417 /* Turn off LED */
2418 mos7840_set_led_sync(port, MODEM_CONTROL_REGISTER, 0x0300);
2419
2420 del_timer_sync(&mos7840_port->led_timer1);
2421 del_timer_sync(&mos7840_port->led_timer2);
2422
2423 usb_kill_urb(mos7840_port->led_urb);
2424 usb_free_urb(mos7840_port->led_urb);
2425 kfree(mos7840_port->led_dr);
2426 }
2427 usb_kill_urb(mos7840_port->control_urb);
2428 usb_free_urb(mos7840_port->control_urb);
2429 kfree(mos7840_port->ctrl_buf);
2430 kfree(mos7840_port->dr);
2431 kfree(mos7840_port);
2432
2433 return 0;
2434}
2435
2436static struct usb_serial_driver moschip7840_4port_device = {
2437 .driver = {
2438 .owner = THIS_MODULE,
2439 .name = "mos7840",
2440 },
2441 .description = DRIVER_DESC,
2442 .id_table = id_table,
2443 .num_ports = 4,
2444 .open = mos7840_open,
2445 .close = mos7840_close,
2446 .write = mos7840_write,
2447 .write_room = mos7840_write_room,
2448 .chars_in_buffer = mos7840_chars_in_buffer,
2449 .throttle = mos7840_throttle,
2450 .unthrottle = mos7840_unthrottle,
2451 .calc_num_ports = mos7840_calc_num_ports,
2452 .probe = mos7840_probe,
2453 .ioctl = mos7840_ioctl,
2454 .set_termios = mos7840_set_termios,
2455 .break_ctl = mos7840_break,
2456 .tiocmget = mos7840_tiocmget,
2457 .tiocmset = mos7840_tiocmset,
2458 .tiocmiwait = usb_serial_generic_tiocmiwait,
2459 .get_icount = usb_serial_generic_get_icount,
2460 .port_probe = mos7840_port_probe,
2461 .port_remove = mos7840_port_remove,
2462 .read_bulk_callback = mos7840_bulk_in_callback,
2463 .read_int_callback = mos7840_interrupt_callback,
2464};
2465
2466static struct usb_serial_driver * const serial_drivers[] = {
2467 &moschip7840_4port_device, NULL
2468};
2469
2470module_usb_serial_driver(serial_drivers, id_table);
2471
2472MODULE_DESCRIPTION(DRIVER_DESC);
2473MODULE_LICENSE("GPL");