1 /*
2 USB Driver layer for GSM modems
3
4 Copyright (C) 2005 Matthias Urlichs <smurf@smurf.noris.de>
5
6 This driver is free software; you can redistribute it and/or modify
7 it under the terms of Version 2 of the GNU General Public License as
8 published by the Free Software Foundation.
9
10 Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
11
12 History: see the git log.
13
14 Work sponsored by: Sigos GmbH, Germany <info@sigos.de>
15
16 This driver exists because the "normal" serial driver doesn't work too well
17 with GSM modems. Issues:
18 - data loss -- one single Receive URB is not nearly enough
19 - controlling the baud rate doesn't make sense
20 */
21
22 #define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
23 #define DRIVER_DESC "USB Driver for GSM modems"
24
25 #include <linux/kernel.h>
26 #include <linux/jiffies.h>
27 #include <linux/errno.h>
28 #include <linux/slab.h>
29 #include <linux/tty.h>
30 #include <linux/tty_flip.h>
31 #include <linux/module.h>
32 #include <linux/bitops.h>
33 #include <linux/uaccess.h>
34 #include <linux/usb.h>
35 #include <linux/usb/serial.h>
36 #include <linux/serial.h>
37 #include "usb-wwan.h"
38
39 /*
40 * Generate DTR/RTS signals on the port using the SET_CONTROL_LINE_STATE request
41 * in CDC ACM.
42 */
usb_wwan_send_setup(struct usb_serial_port * port)43 static int usb_wwan_send_setup(struct usb_serial_port *port)
44 {
45 struct usb_serial *serial = port->serial;
46 struct usb_wwan_port_private *portdata;
47 int val = 0;
48 int ifnum;
49 int res;
50
51 portdata = usb_get_serial_port_data(port);
52
53 if (portdata->dtr_state)
54 val |= 0x01;
55 if (portdata->rts_state)
56 val |= 0x02;
57
58 ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
59
60 res = usb_autopm_get_interface(serial->interface);
61 if (res)
62 return res;
63
64 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
65 0x22, 0x21, val, ifnum, NULL, 0,
66 USB_CTRL_SET_TIMEOUT);
67
68 usb_autopm_put_interface(port->serial->interface);
69
70 return res;
71 }
72
usb_wwan_dtr_rts(struct usb_serial_port * port,int on)73 void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
74 {
75 struct usb_wwan_port_private *portdata;
76 struct usb_wwan_intf_private *intfdata;
77
78 intfdata = usb_get_serial_data(port->serial);
79
80 if (!intfdata->use_send_setup)
81 return;
82
83 portdata = usb_get_serial_port_data(port);
84 /* FIXME: locking */
85 portdata->rts_state = on;
86 portdata->dtr_state = on;
87
88 usb_wwan_send_setup(port);
89 }
90 EXPORT_SYMBOL(usb_wwan_dtr_rts);
91
usb_wwan_tiocmget(struct tty_struct * tty)92 int usb_wwan_tiocmget(struct tty_struct *tty)
93 {
94 struct usb_serial_port *port = tty->driver_data;
95 unsigned int value;
96 struct usb_wwan_port_private *portdata;
97
98 portdata = usb_get_serial_port_data(port);
99
100 value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
101 ((portdata->dtr_state) ? TIOCM_DTR : 0) |
102 ((portdata->cts_state) ? TIOCM_CTS : 0) |
103 ((portdata->dsr_state) ? TIOCM_DSR : 0) |
104 ((portdata->dcd_state) ? TIOCM_CAR : 0) |
105 ((portdata->ri_state) ? TIOCM_RNG : 0);
106
107 return value;
108 }
109 EXPORT_SYMBOL(usb_wwan_tiocmget);
110
usb_wwan_tiocmset(struct tty_struct * tty,unsigned int set,unsigned int clear)111 int usb_wwan_tiocmset(struct tty_struct *tty,
112 unsigned int set, unsigned int clear)
113 {
114 struct usb_serial_port *port = tty->driver_data;
115 struct usb_wwan_port_private *portdata;
116 struct usb_wwan_intf_private *intfdata;
117
118 portdata = usb_get_serial_port_data(port);
119 intfdata = usb_get_serial_data(port->serial);
120
121 if (!intfdata->use_send_setup)
122 return -EINVAL;
123
124 /* FIXME: what locks portdata fields ? */
125 if (set & TIOCM_RTS)
126 portdata->rts_state = 1;
127 if (set & TIOCM_DTR)
128 portdata->dtr_state = 1;
129
130 if (clear & TIOCM_RTS)
131 portdata->rts_state = 0;
132 if (clear & TIOCM_DTR)
133 portdata->dtr_state = 0;
134 return usb_wwan_send_setup(port);
135 }
136 EXPORT_SYMBOL(usb_wwan_tiocmset);
137
get_serial_info(struct usb_serial_port * port,struct serial_struct __user * retinfo)138 static int get_serial_info(struct usb_serial_port *port,
139 struct serial_struct __user *retinfo)
140 {
141 struct serial_struct tmp;
142
143 memset(&tmp, 0, sizeof(tmp));
144 tmp.line = port->minor;
145 tmp.port = port->port_number;
146 tmp.baud_base = tty_get_baud_rate(port->port.tty);
147 tmp.close_delay = port->port.close_delay / 10;
148 tmp.closing_wait = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
149 ASYNC_CLOSING_WAIT_NONE :
150 port->port.closing_wait / 10;
151
152 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
153 return -EFAULT;
154 return 0;
155 }
156
set_serial_info(struct usb_serial_port * port,struct serial_struct __user * newinfo)157 static int set_serial_info(struct usb_serial_port *port,
158 struct serial_struct __user *newinfo)
159 {
160 struct serial_struct new_serial;
161 unsigned int closing_wait, close_delay;
162 int retval = 0;
163
164 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
165 return -EFAULT;
166
167 close_delay = new_serial.close_delay * 10;
168 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
169 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
170
171 mutex_lock(&port->port.mutex);
172
173 if (!capable(CAP_SYS_ADMIN)) {
174 if ((close_delay != port->port.close_delay) ||
175 (closing_wait != port->port.closing_wait))
176 retval = -EPERM;
177 else
178 retval = -EOPNOTSUPP;
179 } else {
180 port->port.close_delay = close_delay;
181 port->port.closing_wait = closing_wait;
182 }
183
184 mutex_unlock(&port->port.mutex);
185 return retval;
186 }
187
usb_wwan_ioctl(struct tty_struct * tty,unsigned int cmd,unsigned long arg)188 int usb_wwan_ioctl(struct tty_struct *tty,
189 unsigned int cmd, unsigned long arg)
190 {
191 struct usb_serial_port *port = tty->driver_data;
192
193 dev_dbg(&port->dev, "%s cmd 0x%04x\n", __func__, cmd);
194
195 switch (cmd) {
196 case TIOCGSERIAL:
197 return get_serial_info(port,
198 (struct serial_struct __user *) arg);
199 case TIOCSSERIAL:
200 return set_serial_info(port,
201 (struct serial_struct __user *) arg);
202 default:
203 break;
204 }
205
206 dev_dbg(&port->dev, "%s arg not supported\n", __func__);
207
208 return -ENOIOCTLCMD;
209 }
210 EXPORT_SYMBOL(usb_wwan_ioctl);
211
usb_wwan_write(struct tty_struct * tty,struct usb_serial_port * port,const unsigned char * buf,int count)212 int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
213 const unsigned char *buf, int count)
214 {
215 struct usb_wwan_port_private *portdata;
216 struct usb_wwan_intf_private *intfdata;
217 int i;
218 int left, todo;
219 struct urb *this_urb = NULL; /* spurious */
220 int err;
221 unsigned long flags;
222
223 portdata = usb_get_serial_port_data(port);
224 intfdata = usb_get_serial_data(port->serial);
225
226 dev_dbg(&port->dev, "%s: write (%d chars)\n", __func__, count);
227
228 i = 0;
229 left = count;
230 for (i = 0; left > 0 && i < N_OUT_URB; i++) {
231 todo = left;
232 if (todo > OUT_BUFLEN)
233 todo = OUT_BUFLEN;
234
235 this_urb = portdata->out_urbs[i];
236 if (test_and_set_bit(i, &portdata->out_busy)) {
237 if (time_before(jiffies,
238 portdata->tx_start_time[i] + 10 * HZ))
239 continue;
240 usb_unlink_urb(this_urb);
241 continue;
242 }
243 dev_dbg(&port->dev, "%s: endpoint %d buf %d\n", __func__,
244 usb_pipeendpoint(this_urb->pipe), i);
245
246 err = usb_autopm_get_interface_async(port->serial->interface);
247 if (err < 0) {
248 clear_bit(i, &portdata->out_busy);
249 break;
250 }
251
252 /* send the data */
253 memcpy(this_urb->transfer_buffer, buf, todo);
254 this_urb->transfer_buffer_length = todo;
255
256 spin_lock_irqsave(&intfdata->susp_lock, flags);
257 if (intfdata->suspended) {
258 usb_anchor_urb(this_urb, &portdata->delayed);
259 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
260 } else {
261 intfdata->in_flight++;
262 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
263 err = usb_submit_urb(this_urb, GFP_ATOMIC);
264 if (err) {
265 dev_err(&port->dev,
266 "%s: submit urb %d failed: %d\n",
267 __func__, i, err);
268 clear_bit(i, &portdata->out_busy);
269 spin_lock_irqsave(&intfdata->susp_lock, flags);
270 intfdata->in_flight--;
271 spin_unlock_irqrestore(&intfdata->susp_lock,
272 flags);
273 usb_autopm_put_interface_async(port->serial->interface);
274 break;
275 }
276 }
277
278 portdata->tx_start_time[i] = jiffies;
279 buf += todo;
280 left -= todo;
281 }
282
283 count -= left;
284 dev_dbg(&port->dev, "%s: wrote (did %d)\n", __func__, count);
285 return count;
286 }
287 EXPORT_SYMBOL(usb_wwan_write);
288
usb_wwan_indat_callback(struct urb * urb)289 static void usb_wwan_indat_callback(struct urb *urb)
290 {
291 int err;
292 int endpoint;
293 struct usb_serial_port *port;
294 struct device *dev;
295 unsigned char *data = urb->transfer_buffer;
296 int status = urb->status;
297
298 endpoint = usb_pipeendpoint(urb->pipe);
299 port = urb->context;
300 dev = &port->dev;
301
302 if (status) {
303 dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n",
304 __func__, status, endpoint);
305 } else {
306 if (urb->actual_length) {
307 tty_insert_flip_string(&port->port, data,
308 urb->actual_length);
309 tty_flip_buffer_push(&port->port);
310 } else
311 dev_dbg(dev, "%s: empty read urb received\n", __func__);
312 }
313 /* Resubmit urb so we continue receiving */
314 err = usb_submit_urb(urb, GFP_ATOMIC);
315 if (err) {
316 if (err != -EPERM && err != -ENODEV) {
317 dev_err(dev, "%s: resubmit read urb failed. (%d)\n",
318 __func__, err);
319 /* busy also in error unless we are killed */
320 usb_mark_last_busy(port->serial->dev);
321 }
322 } else {
323 usb_mark_last_busy(port->serial->dev);
324 }
325 }
326
usb_wwan_outdat_callback(struct urb * urb)327 static void usb_wwan_outdat_callback(struct urb *urb)
328 {
329 struct usb_serial_port *port;
330 struct usb_wwan_port_private *portdata;
331 struct usb_wwan_intf_private *intfdata;
332 int i;
333
334 port = urb->context;
335 intfdata = usb_get_serial_data(port->serial);
336
337 usb_serial_port_softint(port);
338 usb_autopm_put_interface_async(port->serial->interface);
339 portdata = usb_get_serial_port_data(port);
340 spin_lock(&intfdata->susp_lock);
341 intfdata->in_flight--;
342 spin_unlock(&intfdata->susp_lock);
343
344 for (i = 0; i < N_OUT_URB; ++i) {
345 if (portdata->out_urbs[i] == urb) {
346 smp_mb__before_atomic();
347 clear_bit(i, &portdata->out_busy);
348 break;
349 }
350 }
351 }
352
usb_wwan_write_room(struct tty_struct * tty)353 int usb_wwan_write_room(struct tty_struct *tty)
354 {
355 struct usb_serial_port *port = tty->driver_data;
356 struct usb_wwan_port_private *portdata;
357 int i;
358 int data_len = 0;
359 struct urb *this_urb;
360
361 portdata = usb_get_serial_port_data(port);
362
363 for (i = 0; i < N_OUT_URB; i++) {
364 this_urb = portdata->out_urbs[i];
365 if (this_urb && !test_bit(i, &portdata->out_busy))
366 data_len += OUT_BUFLEN;
367 }
368
369 dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
370 return data_len;
371 }
372 EXPORT_SYMBOL(usb_wwan_write_room);
373
usb_wwan_chars_in_buffer(struct tty_struct * tty)374 int usb_wwan_chars_in_buffer(struct tty_struct *tty)
375 {
376 struct usb_serial_port *port = tty->driver_data;
377 struct usb_wwan_port_private *portdata;
378 int i;
379 int data_len = 0;
380 struct urb *this_urb;
381
382 portdata = usb_get_serial_port_data(port);
383
384 for (i = 0; i < N_OUT_URB; i++) {
385 this_urb = portdata->out_urbs[i];
386 /* FIXME: This locking is insufficient as this_urb may
387 go unused during the test */
388 if (this_urb && test_bit(i, &portdata->out_busy))
389 data_len += this_urb->transfer_buffer_length;
390 }
391 dev_dbg(&port->dev, "%s: %d\n", __func__, data_len);
392 return data_len;
393 }
394 EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
395
usb_wwan_open(struct tty_struct * tty,struct usb_serial_port * port)396 int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
397 {
398 struct usb_wwan_port_private *portdata;
399 struct usb_wwan_intf_private *intfdata;
400 struct usb_serial *serial = port->serial;
401 int i, err;
402 struct urb *urb;
403
404 portdata = usb_get_serial_port_data(port);
405 intfdata = usb_get_serial_data(serial);
406
407 if (port->interrupt_in_urb) {
408 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
409 if (err) {
410 dev_err(&port->dev, "%s: submit int urb failed: %d\n",
411 __func__, err);
412 }
413 }
414
415 /* Start reading from the IN endpoint */
416 for (i = 0; i < N_IN_URB; i++) {
417 urb = portdata->in_urbs[i];
418 if (!urb)
419 continue;
420 err = usb_submit_urb(urb, GFP_KERNEL);
421 if (err) {
422 dev_err(&port->dev,
423 "%s: submit read urb %d failed: %d\n",
424 __func__, i, err);
425 }
426 }
427
428 spin_lock_irq(&intfdata->susp_lock);
429 if (++intfdata->open_ports == 1)
430 serial->interface->needs_remote_wakeup = 1;
431 spin_unlock_irq(&intfdata->susp_lock);
432 /* this balances a get in the generic USB serial code */
433 usb_autopm_put_interface(serial->interface);
434
435 return 0;
436 }
437 EXPORT_SYMBOL(usb_wwan_open);
438
unbusy_queued_urb(struct urb * urb,struct usb_wwan_port_private * portdata)439 static void unbusy_queued_urb(struct urb *urb,
440 struct usb_wwan_port_private *portdata)
441 {
442 int i;
443
444 for (i = 0; i < N_OUT_URB; i++) {
445 if (urb == portdata->out_urbs[i]) {
446 clear_bit(i, &portdata->out_busy);
447 break;
448 }
449 }
450 }
451
usb_wwan_close(struct usb_serial_port * port)452 void usb_wwan_close(struct usb_serial_port *port)
453 {
454 int i;
455 struct usb_serial *serial = port->serial;
456 struct usb_wwan_port_private *portdata;
457 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
458 struct urb *urb;
459
460 portdata = usb_get_serial_port_data(port);
461
462 /*
463 * Need to take susp_lock to make sure port is not already being
464 * resumed, but no need to hold it due to initialized
465 */
466 spin_lock_irq(&intfdata->susp_lock);
467 if (--intfdata->open_ports == 0)
468 serial->interface->needs_remote_wakeup = 0;
469 spin_unlock_irq(&intfdata->susp_lock);
470
471 for (;;) {
472 urb = usb_get_from_anchor(&portdata->delayed);
473 if (!urb)
474 break;
475 unbusy_queued_urb(urb, portdata);
476 usb_autopm_put_interface_async(serial->interface);
477 }
478
479 for (i = 0; i < N_IN_URB; i++)
480 usb_kill_urb(portdata->in_urbs[i]);
481 for (i = 0; i < N_OUT_URB; i++)
482 usb_kill_urb(portdata->out_urbs[i]);
483 usb_kill_urb(port->interrupt_in_urb);
484
485 usb_autopm_get_interface_no_resume(serial->interface);
486 }
487 EXPORT_SYMBOL(usb_wwan_close);
488
usb_wwan_setup_urb(struct usb_serial_port * port,int endpoint,int dir,void * ctx,char * buf,int len,void (* callback)(struct urb *))489 static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
490 int endpoint,
491 int dir, void *ctx, char *buf, int len,
492 void (*callback) (struct urb *))
493 {
494 struct usb_serial *serial = port->serial;
495 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
496 struct urb *urb;
497
498 urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
499 if (!urb)
500 return NULL;
501
502 usb_fill_bulk_urb(urb, serial->dev,
503 usb_sndbulkpipe(serial->dev, endpoint) | dir,
504 buf, len, callback, ctx);
505
506 if (intfdata->use_zlp && dir == USB_DIR_OUT)
507 urb->transfer_flags |= URB_ZERO_PACKET;
508
509 return urb;
510 }
511
usb_wwan_port_probe(struct usb_serial_port * port)512 int usb_wwan_port_probe(struct usb_serial_port *port)
513 {
514 struct usb_wwan_port_private *portdata;
515 struct urb *urb;
516 u8 *buffer;
517 int i;
518
519 if (!port->bulk_in_size || !port->bulk_out_size)
520 return -ENODEV;
521
522 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
523 if (!portdata)
524 return -ENOMEM;
525
526 init_usb_anchor(&portdata->delayed);
527
528 for (i = 0; i < N_IN_URB; i++) {
529 buffer = (u8 *)__get_free_page(GFP_KERNEL);
530 if (!buffer)
531 goto bail_out_error;
532 portdata->in_buffer[i] = buffer;
533
534 urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress,
535 USB_DIR_IN, port,
536 buffer, IN_BUFLEN,
537 usb_wwan_indat_callback);
538 portdata->in_urbs[i] = urb;
539 }
540
541 for (i = 0; i < N_OUT_URB; i++) {
542 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
543 if (!buffer)
544 goto bail_out_error2;
545 portdata->out_buffer[i] = buffer;
546
547 urb = usb_wwan_setup_urb(port, port->bulk_out_endpointAddress,
548 USB_DIR_OUT, port,
549 buffer, OUT_BUFLEN,
550 usb_wwan_outdat_callback);
551 portdata->out_urbs[i] = urb;
552 }
553
554 usb_set_serial_port_data(port, portdata);
555
556 return 0;
557
558 bail_out_error2:
559 for (i = 0; i < N_OUT_URB; i++) {
560 usb_free_urb(portdata->out_urbs[i]);
561 kfree(portdata->out_buffer[i]);
562 }
563 bail_out_error:
564 for (i = 0; i < N_IN_URB; i++) {
565 usb_free_urb(portdata->in_urbs[i]);
566 free_page((unsigned long)portdata->in_buffer[i]);
567 }
568 kfree(portdata);
569
570 return -ENOMEM;
571 }
572 EXPORT_SYMBOL_GPL(usb_wwan_port_probe);
573
usb_wwan_port_remove(struct usb_serial_port * port)574 int usb_wwan_port_remove(struct usb_serial_port *port)
575 {
576 int i;
577 struct usb_wwan_port_private *portdata;
578
579 portdata = usb_get_serial_port_data(port);
580 usb_set_serial_port_data(port, NULL);
581
582 for (i = 0; i < N_IN_URB; i++) {
583 usb_free_urb(portdata->in_urbs[i]);
584 free_page((unsigned long)portdata->in_buffer[i]);
585 }
586 for (i = 0; i < N_OUT_URB; i++) {
587 usb_free_urb(portdata->out_urbs[i]);
588 kfree(portdata->out_buffer[i]);
589 }
590
591 kfree(portdata);
592
593 return 0;
594 }
595 EXPORT_SYMBOL(usb_wwan_port_remove);
596
597 #ifdef CONFIG_PM
stop_urbs(struct usb_serial * serial)598 static void stop_urbs(struct usb_serial *serial)
599 {
600 int i, j;
601 struct usb_serial_port *port;
602 struct usb_wwan_port_private *portdata;
603
604 for (i = 0; i < serial->num_ports; ++i) {
605 port = serial->port[i];
606 portdata = usb_get_serial_port_data(port);
607 if (!portdata)
608 continue;
609 for (j = 0; j < N_IN_URB; j++)
610 usb_kill_urb(portdata->in_urbs[j]);
611 for (j = 0; j < N_OUT_URB; j++)
612 usb_kill_urb(portdata->out_urbs[j]);
613 usb_kill_urb(port->interrupt_in_urb);
614 }
615 }
616
usb_wwan_suspend(struct usb_serial * serial,pm_message_t message)617 int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
618 {
619 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
620
621 spin_lock_irq(&intfdata->susp_lock);
622 if (PMSG_IS_AUTO(message)) {
623 if (intfdata->in_flight) {
624 spin_unlock_irq(&intfdata->susp_lock);
625 return -EBUSY;
626 }
627 }
628 intfdata->suspended = 1;
629 spin_unlock_irq(&intfdata->susp_lock);
630
631 stop_urbs(serial);
632
633 return 0;
634 }
635 EXPORT_SYMBOL(usb_wwan_suspend);
636
637 /* Caller must hold susp_lock. */
usb_wwan_submit_delayed_urbs(struct usb_serial_port * port)638 static int usb_wwan_submit_delayed_urbs(struct usb_serial_port *port)
639 {
640 struct usb_serial *serial = port->serial;
641 struct usb_wwan_intf_private *data = usb_get_serial_data(serial);
642 struct usb_wwan_port_private *portdata;
643 struct urb *urb;
644 int err_count = 0;
645 int err;
646
647 portdata = usb_get_serial_port_data(port);
648
649 for (;;) {
650 urb = usb_get_from_anchor(&portdata->delayed);
651 if (!urb)
652 break;
653
654 err = usb_submit_urb(urb, GFP_ATOMIC);
655 if (err) {
656 dev_err(&port->dev, "%s: submit urb failed: %d\n",
657 __func__, err);
658 err_count++;
659 unbusy_queued_urb(urb, portdata);
660 usb_autopm_put_interface_async(serial->interface);
661 continue;
662 }
663 data->in_flight++;
664 }
665
666 if (err_count)
667 return -EIO;
668
669 return 0;
670 }
671
usb_wwan_resume(struct usb_serial * serial)672 int usb_wwan_resume(struct usb_serial *serial)
673 {
674 int i, j;
675 struct usb_serial_port *port;
676 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
677 struct usb_wwan_port_private *portdata;
678 struct urb *urb;
679 int err;
680 int err_count = 0;
681
682 spin_lock_irq(&intfdata->susp_lock);
683 for (i = 0; i < serial->num_ports; i++) {
684 port = serial->port[i];
685
686 if (!tty_port_initialized(&port->port))
687 continue;
688
689 portdata = usb_get_serial_port_data(port);
690
691 if (port->interrupt_in_urb) {
692 err = usb_submit_urb(port->interrupt_in_urb,
693 GFP_ATOMIC);
694 if (err) {
695 dev_err(&port->dev,
696 "%s: submit int urb failed: %d\n",
697 __func__, err);
698 err_count++;
699 }
700 }
701
702 err = usb_wwan_submit_delayed_urbs(port);
703 if (err)
704 err_count++;
705
706 for (j = 0; j < N_IN_URB; j++) {
707 urb = portdata->in_urbs[j];
708 err = usb_submit_urb(urb, GFP_ATOMIC);
709 if (err < 0) {
710 dev_err(&port->dev,
711 "%s: submit read urb %d failed: %d\n",
712 __func__, i, err);
713 err_count++;
714 }
715 }
716 }
717 intfdata->suspended = 0;
718 spin_unlock_irq(&intfdata->susp_lock);
719
720 if (err_count)
721 return -EIO;
722
723 return 0;
724 }
725 EXPORT_SYMBOL(usb_wwan_resume);
726 #endif
727
728 MODULE_AUTHOR(DRIVER_AUTHOR);
729 MODULE_DESCRIPTION(DRIVER_DESC);
730 MODULE_LICENSE("GPL");
731