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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_VERSION "v0.7.2"
23#define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
24#define DRIVER_DESC "USB Driver for GSM modems"
25
26#include <linux/kernel.h>
27#include <linux/jiffies.h>
28#include <linux/errno.h>
29#include <linux/slab.h>
30#include <linux/tty.h>
31#include <linux/tty_flip.h>
32#include <linux/module.h>
33#include <linux/bitops.h>
34#include <linux/uaccess.h>
35#include <linux/usb.h>
36#include <linux/usb/serial.h>
37#include <linux/serial.h>
38#include "usb-wwan.h"
39
40static int debug;
41
42void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
43{
44 struct usb_serial *serial = port->serial;
45 struct usb_wwan_port_private *portdata;
46
47 struct usb_wwan_intf_private *intfdata;
48
49 dbg("%s", __func__);
50
51 intfdata = port->serial->private;
52
53 if (!intfdata->send_setup)
54 return;
55
56 portdata = usb_get_serial_port_data(port);
57 mutex_lock(&serial->disc_mutex);
58 portdata->rts_state = on;
59 portdata->dtr_state = on;
60 if (serial->dev)
61 intfdata->send_setup(port);
62 mutex_unlock(&serial->disc_mutex);
63}
64EXPORT_SYMBOL(usb_wwan_dtr_rts);
65
66void usb_wwan_set_termios(struct tty_struct *tty,
67 struct usb_serial_port *port,
68 struct ktermios *old_termios)
69{
70 struct usb_wwan_intf_private *intfdata = port->serial->private;
71
72 dbg("%s", __func__);
73
74 /* Doesn't support option setting */
75 tty_termios_copy_hw(tty->termios, old_termios);
76
77 if (intfdata->send_setup)
78 intfdata->send_setup(port);
79}
80EXPORT_SYMBOL(usb_wwan_set_termios);
81
82int usb_wwan_tiocmget(struct tty_struct *tty)
83{
84 struct usb_serial_port *port = tty->driver_data;
85 unsigned int value;
86 struct usb_wwan_port_private *portdata;
87
88 portdata = usb_get_serial_port_data(port);
89
90 value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
91 ((portdata->dtr_state) ? TIOCM_DTR : 0) |
92 ((portdata->cts_state) ? TIOCM_CTS : 0) |
93 ((portdata->dsr_state) ? TIOCM_DSR : 0) |
94 ((portdata->dcd_state) ? TIOCM_CAR : 0) |
95 ((portdata->ri_state) ? TIOCM_RNG : 0);
96
97 return value;
98}
99EXPORT_SYMBOL(usb_wwan_tiocmget);
100
101int usb_wwan_tiocmset(struct tty_struct *tty,
102 unsigned int set, unsigned int clear)
103{
104 struct usb_serial_port *port = tty->driver_data;
105 struct usb_wwan_port_private *portdata;
106 struct usb_wwan_intf_private *intfdata;
107
108 portdata = usb_get_serial_port_data(port);
109 intfdata = port->serial->private;
110
111 if (!intfdata->send_setup)
112 return -EINVAL;
113
114 /* FIXME: what locks portdata fields ? */
115 if (set & TIOCM_RTS)
116 portdata->rts_state = 1;
117 if (set & TIOCM_DTR)
118 portdata->dtr_state = 1;
119
120 if (clear & TIOCM_RTS)
121 portdata->rts_state = 0;
122 if (clear & TIOCM_DTR)
123 portdata->dtr_state = 0;
124 return intfdata->send_setup(port);
125}
126EXPORT_SYMBOL(usb_wwan_tiocmset);
127
128static int get_serial_info(struct usb_serial_port *port,
129 struct serial_struct __user *retinfo)
130{
131 struct serial_struct tmp;
132
133 if (!retinfo)
134 return -EFAULT;
135
136 memset(&tmp, 0, sizeof(tmp));
137 tmp.line = port->serial->minor;
138 tmp.port = port->number;
139 tmp.baud_base = tty_get_baud_rate(port->port.tty);
140 tmp.close_delay = port->port.close_delay / 10;
141 tmp.closing_wait = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
142 ASYNC_CLOSING_WAIT_NONE :
143 port->port.closing_wait / 10;
144
145 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
146 return -EFAULT;
147 return 0;
148}
149
150static int set_serial_info(struct usb_serial_port *port,
151 struct serial_struct __user *newinfo)
152{
153 struct serial_struct new_serial;
154 unsigned int closing_wait, close_delay;
155 int retval = 0;
156
157 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
158 return -EFAULT;
159
160 close_delay = new_serial.close_delay * 10;
161 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
162 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
163
164 mutex_lock(&port->port.mutex);
165
166 if (!capable(CAP_SYS_ADMIN)) {
167 if ((close_delay != port->port.close_delay) ||
168 (closing_wait != port->port.closing_wait))
169 retval = -EPERM;
170 else
171 retval = -EOPNOTSUPP;
172 } else {
173 port->port.close_delay = close_delay;
174 port->port.closing_wait = closing_wait;
175 }
176
177 mutex_unlock(&port->port.mutex);
178 return retval;
179}
180
181int usb_wwan_ioctl(struct tty_struct *tty,
182 unsigned int cmd, unsigned long arg)
183{
184 struct usb_serial_port *port = tty->driver_data;
185
186 dbg("%s cmd 0x%04x", __func__, cmd);
187
188 switch (cmd) {
189 case TIOCGSERIAL:
190 return get_serial_info(port,
191 (struct serial_struct __user *) arg);
192 case TIOCSSERIAL:
193 return set_serial_info(port,
194 (struct serial_struct __user *) arg);
195 default:
196 break;
197 }
198
199 dbg("%s arg not supported", __func__);
200
201 return -ENOIOCTLCMD;
202}
203EXPORT_SYMBOL(usb_wwan_ioctl);
204
205/* Write */
206int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
207 const unsigned char *buf, int count)
208{
209 struct usb_wwan_port_private *portdata;
210 struct usb_wwan_intf_private *intfdata;
211 int i;
212 int left, todo;
213 struct urb *this_urb = NULL; /* spurious */
214 int err;
215 unsigned long flags;
216
217 portdata = usb_get_serial_port_data(port);
218 intfdata = port->serial->private;
219
220 dbg("%s: write (%d chars)", __func__, count);
221
222 i = 0;
223 left = count;
224 for (i = 0; left > 0 && i < N_OUT_URB; i++) {
225 todo = left;
226 if (todo > OUT_BUFLEN)
227 todo = OUT_BUFLEN;
228
229 this_urb = portdata->out_urbs[i];
230 if (test_and_set_bit(i, &portdata->out_busy)) {
231 if (time_before(jiffies,
232 portdata->tx_start_time[i] + 10 * HZ))
233 continue;
234 usb_unlink_urb(this_urb);
235 continue;
236 }
237 dbg("%s: endpoint %d buf %d", __func__,
238 usb_pipeendpoint(this_urb->pipe), i);
239
240 err = usb_autopm_get_interface_async(port->serial->interface);
241 if (err < 0)
242 break;
243
244 /* send the data */
245 memcpy(this_urb->transfer_buffer, buf, todo);
246 this_urb->transfer_buffer_length = todo;
247
248 spin_lock_irqsave(&intfdata->susp_lock, flags);
249 if (intfdata->suspended) {
250 usb_anchor_urb(this_urb, &portdata->delayed);
251 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
252 } else {
253 intfdata->in_flight++;
254 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
255 err = usb_submit_urb(this_urb, GFP_ATOMIC);
256 if (err) {
257 dbg("usb_submit_urb %p (write bulk) failed "
258 "(%d)", this_urb, err);
259 clear_bit(i, &portdata->out_busy);
260 spin_lock_irqsave(&intfdata->susp_lock, flags);
261 intfdata->in_flight--;
262 spin_unlock_irqrestore(&intfdata->susp_lock,
263 flags);
264 usb_autopm_put_interface_async(port->serial->interface);
265 break;
266 }
267 }
268
269 portdata->tx_start_time[i] = jiffies;
270 buf += todo;
271 left -= todo;
272 }
273
274 count -= left;
275 dbg("%s: wrote (did %d)", __func__, count);
276 return count;
277}
278EXPORT_SYMBOL(usb_wwan_write);
279
280static void usb_wwan_indat_callback(struct urb *urb)
281{
282 int err;
283 int endpoint;
284 struct usb_serial_port *port;
285 struct tty_struct *tty;
286 unsigned char *data = urb->transfer_buffer;
287 int status = urb->status;
288
289 dbg("%s: %p", __func__, urb);
290
291 endpoint = usb_pipeendpoint(urb->pipe);
292 port = urb->context;
293
294 if (status) {
295 dbg("%s: nonzero status: %d on endpoint %02x.",
296 __func__, status, endpoint);
297 } else {
298 tty = tty_port_tty_get(&port->port);
299 if (tty) {
300 if (urb->actual_length) {
301 tty_insert_flip_string(tty, data,
302 urb->actual_length);
303 tty_flip_buffer_push(tty);
304 } else
305 dbg("%s: empty read urb received", __func__);
306 tty_kref_put(tty);
307 }
308
309 /* Resubmit urb so we continue receiving */
310 if (status != -ESHUTDOWN) {
311 err = usb_submit_urb(urb, GFP_ATOMIC);
312 if (err) {
313 if (err != -EPERM) {
314 printk(KERN_ERR "%s: resubmit read urb failed. "
315 "(%d)", __func__, err);
316 /* busy also in error unless we are killed */
317 usb_mark_last_busy(port->serial->dev);
318 }
319 } else {
320 usb_mark_last_busy(port->serial->dev);
321 }
322 }
323
324 }
325}
326
327static 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 dbg("%s", __func__);
335
336 port = urb->context;
337 intfdata = port->serial->private;
338
339 usb_serial_port_softint(port);
340 usb_autopm_put_interface_async(port->serial->interface);
341 portdata = usb_get_serial_port_data(port);
342 spin_lock(&intfdata->susp_lock);
343 intfdata->in_flight--;
344 spin_unlock(&intfdata->susp_lock);
345
346 for (i = 0; i < N_OUT_URB; ++i) {
347 if (portdata->out_urbs[i] == urb) {
348 smp_mb__before_clear_bit();
349 clear_bit(i, &portdata->out_busy);
350 break;
351 }
352 }
353}
354
355int usb_wwan_write_room(struct tty_struct *tty)
356{
357 struct usb_serial_port *port = tty->driver_data;
358 struct usb_wwan_port_private *portdata;
359 int i;
360 int data_len = 0;
361 struct urb *this_urb;
362
363 portdata = usb_get_serial_port_data(port);
364
365 for (i = 0; i < N_OUT_URB; i++) {
366 this_urb = portdata->out_urbs[i];
367 if (this_urb && !test_bit(i, &portdata->out_busy))
368 data_len += OUT_BUFLEN;
369 }
370
371 dbg("%s: %d", __func__, data_len);
372 return data_len;
373}
374EXPORT_SYMBOL(usb_wwan_write_room);
375
376int usb_wwan_chars_in_buffer(struct tty_struct *tty)
377{
378 struct usb_serial_port *port = tty->driver_data;
379 struct usb_wwan_port_private *portdata;
380 int i;
381 int data_len = 0;
382 struct urb *this_urb;
383
384 portdata = usb_get_serial_port_data(port);
385
386 for (i = 0; i < N_OUT_URB; i++) {
387 this_urb = portdata->out_urbs[i];
388 /* FIXME: This locking is insufficient as this_urb may
389 go unused during the test */
390 if (this_urb && test_bit(i, &portdata->out_busy))
391 data_len += this_urb->transfer_buffer_length;
392 }
393 dbg("%s: %d", __func__, data_len);
394 return data_len;
395}
396EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
397
398int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
399{
400 struct usb_wwan_port_private *portdata;
401 struct usb_wwan_intf_private *intfdata;
402 struct usb_serial *serial = port->serial;
403 int i, err;
404 struct urb *urb;
405
406 portdata = usb_get_serial_port_data(port);
407 intfdata = serial->private;
408
409 dbg("%s", __func__);
410
411 /* Start reading from the IN endpoint */
412 for (i = 0; i < N_IN_URB; i++) {
413 urb = portdata->in_urbs[i];
414 if (!urb)
415 continue;
416 err = usb_submit_urb(urb, GFP_KERNEL);
417 if (err) {
418 dbg("%s: submit urb %d failed (%d) %d",
419 __func__, i, err, urb->transfer_buffer_length);
420 }
421 }
422
423 if (intfdata->send_setup)
424 intfdata->send_setup(port);
425
426 serial->interface->needs_remote_wakeup = 1;
427 spin_lock_irq(&intfdata->susp_lock);
428 portdata->opened = 1;
429 spin_unlock_irq(&intfdata->susp_lock);
430 /* this balances a get in the generic USB serial code */
431 usb_autopm_put_interface(serial->interface);
432
433 return 0;
434}
435EXPORT_SYMBOL(usb_wwan_open);
436
437void usb_wwan_close(struct usb_serial_port *port)
438{
439 int i;
440 struct usb_serial *serial = port->serial;
441 struct usb_wwan_port_private *portdata;
442 struct usb_wwan_intf_private *intfdata = port->serial->private;
443
444 dbg("%s", __func__);
445 portdata = usb_get_serial_port_data(port);
446
447 if (serial->dev) {
448 /* Stop reading/writing urbs */
449 spin_lock_irq(&intfdata->susp_lock);
450 portdata->opened = 0;
451 spin_unlock_irq(&intfdata->susp_lock);
452
453 for (i = 0; i < N_IN_URB; i++)
454 usb_kill_urb(portdata->in_urbs[i]);
455 for (i = 0; i < N_OUT_URB; i++)
456 usb_kill_urb(portdata->out_urbs[i]);
457 /* balancing - important as an error cannot be handled*/
458 usb_autopm_get_interface_no_resume(serial->interface);
459 serial->interface->needs_remote_wakeup = 0;
460 }
461}
462EXPORT_SYMBOL(usb_wwan_close);
463
464/* Helper functions used by usb_wwan_setup_urbs */
465static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint,
466 int dir, void *ctx, char *buf, int len,
467 void (*callback) (struct urb *))
468{
469 struct urb *urb;
470
471 if (endpoint == -1)
472 return NULL; /* endpoint not needed */
473
474 urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
475 if (urb == NULL) {
476 dbg("%s: alloc for endpoint %d failed.", __func__, endpoint);
477 return NULL;
478 }
479
480 /* Fill URB using supplied data. */
481 usb_fill_bulk_urb(urb, serial->dev,
482 usb_sndbulkpipe(serial->dev, endpoint) | dir,
483 buf, len, callback, ctx);
484
485 return urb;
486}
487
488/* Setup urbs */
489static void usb_wwan_setup_urbs(struct usb_serial *serial)
490{
491 int i, j;
492 struct usb_serial_port *port;
493 struct usb_wwan_port_private *portdata;
494
495 dbg("%s", __func__);
496
497 for (i = 0; i < serial->num_ports; i++) {
498 port = serial->port[i];
499 portdata = usb_get_serial_port_data(port);
500
501 /* Do indat endpoints first */
502 for (j = 0; j < N_IN_URB; ++j) {
503 portdata->in_urbs[j] = usb_wwan_setup_urb(serial,
504 port->
505 bulk_in_endpointAddress,
506 USB_DIR_IN,
507 port,
508 portdata->
509 in_buffer[j],
510 IN_BUFLEN,
511 usb_wwan_indat_callback);
512 }
513
514 /* outdat endpoints */
515 for (j = 0; j < N_OUT_URB; ++j) {
516 portdata->out_urbs[j] = usb_wwan_setup_urb(serial,
517 port->
518 bulk_out_endpointAddress,
519 USB_DIR_OUT,
520 port,
521 portdata->
522 out_buffer
523 [j],
524 OUT_BUFLEN,
525 usb_wwan_outdat_callback);
526 }
527 }
528}
529
530int usb_wwan_startup(struct usb_serial *serial)
531{
532 int i, j, err;
533 struct usb_serial_port *port;
534 struct usb_wwan_port_private *portdata;
535 u8 *buffer;
536
537 dbg("%s", __func__);
538
539 /* Now setup per port private data */
540 for (i = 0; i < serial->num_ports; i++) {
541 port = serial->port[i];
542 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
543 if (!portdata) {
544 dbg("%s: kmalloc for usb_wwan_port_private (%d) failed!.",
545 __func__, i);
546 return 1;
547 }
548 init_usb_anchor(&portdata->delayed);
549
550 for (j = 0; j < N_IN_URB; j++) {
551 buffer = (u8 *) __get_free_page(GFP_KERNEL);
552 if (!buffer)
553 goto bail_out_error;
554 portdata->in_buffer[j] = buffer;
555 }
556
557 for (j = 0; j < N_OUT_URB; j++) {
558 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
559 if (!buffer)
560 goto bail_out_error2;
561 portdata->out_buffer[j] = buffer;
562 }
563
564 usb_set_serial_port_data(port, portdata);
565
566 if (!port->interrupt_in_urb)
567 continue;
568 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
569 if (err)
570 dbg("%s: submit irq_in urb failed %d", __func__, err);
571 }
572 usb_wwan_setup_urbs(serial);
573 return 0;
574
575bail_out_error2:
576 for (j = 0; j < N_OUT_URB; j++)
577 kfree(portdata->out_buffer[j]);
578bail_out_error:
579 for (j = 0; j < N_IN_URB; j++)
580 if (portdata->in_buffer[j])
581 free_page((unsigned long)portdata->in_buffer[j]);
582 kfree(portdata);
583 return 1;
584}
585EXPORT_SYMBOL(usb_wwan_startup);
586
587static void stop_read_write_urbs(struct usb_serial *serial)
588{
589 int i, j;
590 struct usb_serial_port *port;
591 struct usb_wwan_port_private *portdata;
592
593 /* Stop reading/writing urbs */
594 for (i = 0; i < serial->num_ports; ++i) {
595 port = serial->port[i];
596 portdata = usb_get_serial_port_data(port);
597 for (j = 0; j < N_IN_URB; j++)
598 usb_kill_urb(portdata->in_urbs[j]);
599 for (j = 0; j < N_OUT_URB; j++)
600 usb_kill_urb(portdata->out_urbs[j]);
601 }
602}
603
604void usb_wwan_disconnect(struct usb_serial *serial)
605{
606 dbg("%s", __func__);
607
608 stop_read_write_urbs(serial);
609}
610EXPORT_SYMBOL(usb_wwan_disconnect);
611
612void usb_wwan_release(struct usb_serial *serial)
613{
614 int i, j;
615 struct usb_serial_port *port;
616 struct usb_wwan_port_private *portdata;
617
618 dbg("%s", __func__);
619
620 /* Now free them */
621 for (i = 0; i < serial->num_ports; ++i) {
622 port = serial->port[i];
623 portdata = usb_get_serial_port_data(port);
624
625 for (j = 0; j < N_IN_URB; j++) {
626 usb_free_urb(portdata->in_urbs[j]);
627 free_page((unsigned long)
628 portdata->in_buffer[j]);
629 portdata->in_urbs[j] = NULL;
630 }
631 for (j = 0; j < N_OUT_URB; j++) {
632 usb_free_urb(portdata->out_urbs[j]);
633 kfree(portdata->out_buffer[j]);
634 portdata->out_urbs[j] = NULL;
635 }
636 }
637
638 /* Now free per port private data */
639 for (i = 0; i < serial->num_ports; i++) {
640 port = serial->port[i];
641 kfree(usb_get_serial_port_data(port));
642 }
643}
644EXPORT_SYMBOL(usb_wwan_release);
645
646#ifdef CONFIG_PM
647int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
648{
649 struct usb_wwan_intf_private *intfdata = serial->private;
650 int b;
651
652 dbg("%s entered", __func__);
653
654 if (message.event & PM_EVENT_AUTO) {
655 spin_lock_irq(&intfdata->susp_lock);
656 b = intfdata->in_flight;
657 spin_unlock_irq(&intfdata->susp_lock);
658
659 if (b)
660 return -EBUSY;
661 }
662
663 spin_lock_irq(&intfdata->susp_lock);
664 intfdata->suspended = 1;
665 spin_unlock_irq(&intfdata->susp_lock);
666 stop_read_write_urbs(serial);
667
668 return 0;
669}
670EXPORT_SYMBOL(usb_wwan_suspend);
671
672static void unbusy_queued_urb(struct urb *urb, struct usb_wwan_port_private *portdata)
673{
674 int i;
675
676 for (i = 0; i < N_OUT_URB; i++) {
677 if (urb == portdata->out_urbs[i]) {
678 clear_bit(i, &portdata->out_busy);
679 break;
680 }
681 }
682}
683
684static void play_delayed(struct usb_serial_port *port)
685{
686 struct usb_wwan_intf_private *data;
687 struct usb_wwan_port_private *portdata;
688 struct urb *urb;
689 int err;
690
691 portdata = usb_get_serial_port_data(port);
692 data = port->serial->private;
693 while ((urb = usb_get_from_anchor(&portdata->delayed))) {
694 err = usb_submit_urb(urb, GFP_ATOMIC);
695 if (!err) {
696 data->in_flight++;
697 } else {
698 /* we have to throw away the rest */
699 do {
700 unbusy_queued_urb(urb, portdata);
701 usb_autopm_put_interface_no_suspend(port->serial->interface);
702 } while ((urb = usb_get_from_anchor(&portdata->delayed)));
703 break;
704 }
705 }
706}
707
708int usb_wwan_resume(struct usb_serial *serial)
709{
710 int i, j;
711 struct usb_serial_port *port;
712 struct usb_wwan_intf_private *intfdata = serial->private;
713 struct usb_wwan_port_private *portdata;
714 struct urb *urb;
715 int err = 0;
716
717 dbg("%s entered", __func__);
718 /* get the interrupt URBs resubmitted unconditionally */
719 for (i = 0; i < serial->num_ports; i++) {
720 port = serial->port[i];
721 if (!port->interrupt_in_urb) {
722 dbg("%s: No interrupt URB for port %d", __func__, i);
723 continue;
724 }
725 err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
726 dbg("Submitted interrupt URB for port %d (result %d)", i, err);
727 if (err < 0) {
728 err("%s: Error %d for interrupt URB of port%d",
729 __func__, err, i);
730 goto err_out;
731 }
732 }
733
734 for (i = 0; i < serial->num_ports; i++) {
735 /* walk all ports */
736 port = serial->port[i];
737 portdata = usb_get_serial_port_data(port);
738
739 /* skip closed ports */
740 spin_lock_irq(&intfdata->susp_lock);
741 if (!portdata->opened) {
742 spin_unlock_irq(&intfdata->susp_lock);
743 continue;
744 }
745
746 for (j = 0; j < N_IN_URB; j++) {
747 urb = portdata->in_urbs[j];
748 err = usb_submit_urb(urb, GFP_ATOMIC);
749 if (err < 0) {
750 err("%s: Error %d for bulk URB %d",
751 __func__, err, i);
752 spin_unlock_irq(&intfdata->susp_lock);
753 goto err_out;
754 }
755 }
756 play_delayed(port);
757 spin_unlock_irq(&intfdata->susp_lock);
758 }
759 spin_lock_irq(&intfdata->susp_lock);
760 intfdata->suspended = 0;
761 spin_unlock_irq(&intfdata->susp_lock);
762err_out:
763 return err;
764}
765EXPORT_SYMBOL(usb_wwan_resume);
766#endif
767
768MODULE_AUTHOR(DRIVER_AUTHOR);
769MODULE_DESCRIPTION(DRIVER_DESC);
770MODULE_VERSION(DRIVER_VERSION);
771MODULE_LICENSE("GPL");
772
773module_param(debug, bool, S_IRUGO | S_IWUSR);
774MODULE_PARM_DESC(debug, "Debug messages");
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_VERSION "v0.7.2"
23#define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
24#define DRIVER_DESC "USB Driver for GSM modems"
25
26#include <linux/kernel.h>
27#include <linux/jiffies.h>
28#include <linux/errno.h>
29#include <linux/slab.h>
30#include <linux/tty.h>
31#include <linux/tty_flip.h>
32#include <linux/module.h>
33#include <linux/bitops.h>
34#include <linux/uaccess.h>
35#include <linux/usb.h>
36#include <linux/usb/serial.h>
37#include <linux/serial.h>
38#include "usb-wwan.h"
39
40static bool debug;
41
42void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
43{
44 struct usb_serial *serial = port->serial;
45 struct usb_wwan_port_private *portdata;
46 struct usb_wwan_intf_private *intfdata;
47
48 intfdata = port->serial->private;
49
50 if (!intfdata->send_setup)
51 return;
52
53 portdata = usb_get_serial_port_data(port);
54 mutex_lock(&serial->disc_mutex);
55 portdata->rts_state = on;
56 portdata->dtr_state = on;
57 if (serial->dev)
58 intfdata->send_setup(port);
59 mutex_unlock(&serial->disc_mutex);
60}
61EXPORT_SYMBOL(usb_wwan_dtr_rts);
62
63void usb_wwan_set_termios(struct tty_struct *tty,
64 struct usb_serial_port *port,
65 struct ktermios *old_termios)
66{
67 struct usb_wwan_intf_private *intfdata = port->serial->private;
68
69 /* Doesn't support option setting */
70 tty_termios_copy_hw(tty->termios, old_termios);
71
72 if (intfdata->send_setup)
73 intfdata->send_setup(port);
74}
75EXPORT_SYMBOL(usb_wwan_set_termios);
76
77int usb_wwan_tiocmget(struct tty_struct *tty)
78{
79 struct usb_serial_port *port = tty->driver_data;
80 unsigned int value;
81 struct usb_wwan_port_private *portdata;
82
83 portdata = usb_get_serial_port_data(port);
84
85 value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
86 ((portdata->dtr_state) ? TIOCM_DTR : 0) |
87 ((portdata->cts_state) ? TIOCM_CTS : 0) |
88 ((portdata->dsr_state) ? TIOCM_DSR : 0) |
89 ((portdata->dcd_state) ? TIOCM_CAR : 0) |
90 ((portdata->ri_state) ? TIOCM_RNG : 0);
91
92 return value;
93}
94EXPORT_SYMBOL(usb_wwan_tiocmget);
95
96int usb_wwan_tiocmset(struct tty_struct *tty,
97 unsigned int set, unsigned int clear)
98{
99 struct usb_serial_port *port = tty->driver_data;
100 struct usb_wwan_port_private *portdata;
101 struct usb_wwan_intf_private *intfdata;
102
103 portdata = usb_get_serial_port_data(port);
104 intfdata = port->serial->private;
105
106 if (!intfdata->send_setup)
107 return -EINVAL;
108
109 /* FIXME: what locks portdata fields ? */
110 if (set & TIOCM_RTS)
111 portdata->rts_state = 1;
112 if (set & TIOCM_DTR)
113 portdata->dtr_state = 1;
114
115 if (clear & TIOCM_RTS)
116 portdata->rts_state = 0;
117 if (clear & TIOCM_DTR)
118 portdata->dtr_state = 0;
119 return intfdata->send_setup(port);
120}
121EXPORT_SYMBOL(usb_wwan_tiocmset);
122
123static int get_serial_info(struct usb_serial_port *port,
124 struct serial_struct __user *retinfo)
125{
126 struct serial_struct tmp;
127
128 if (!retinfo)
129 return -EFAULT;
130
131 memset(&tmp, 0, sizeof(tmp));
132 tmp.line = port->serial->minor;
133 tmp.port = port->number;
134 tmp.baud_base = tty_get_baud_rate(port->port.tty);
135 tmp.close_delay = port->port.close_delay / 10;
136 tmp.closing_wait = port->port.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
137 ASYNC_CLOSING_WAIT_NONE :
138 port->port.closing_wait / 10;
139
140 if (copy_to_user(retinfo, &tmp, sizeof(*retinfo)))
141 return -EFAULT;
142 return 0;
143}
144
145static int set_serial_info(struct usb_serial_port *port,
146 struct serial_struct __user *newinfo)
147{
148 struct serial_struct new_serial;
149 unsigned int closing_wait, close_delay;
150 int retval = 0;
151
152 if (copy_from_user(&new_serial, newinfo, sizeof(new_serial)))
153 return -EFAULT;
154
155 close_delay = new_serial.close_delay * 10;
156 closing_wait = new_serial.closing_wait == ASYNC_CLOSING_WAIT_NONE ?
157 ASYNC_CLOSING_WAIT_NONE : new_serial.closing_wait * 10;
158
159 mutex_lock(&port->port.mutex);
160
161 if (!capable(CAP_SYS_ADMIN)) {
162 if ((close_delay != port->port.close_delay) ||
163 (closing_wait != port->port.closing_wait))
164 retval = -EPERM;
165 else
166 retval = -EOPNOTSUPP;
167 } else {
168 port->port.close_delay = close_delay;
169 port->port.closing_wait = closing_wait;
170 }
171
172 mutex_unlock(&port->port.mutex);
173 return retval;
174}
175
176int usb_wwan_ioctl(struct tty_struct *tty,
177 unsigned int cmd, unsigned long arg)
178{
179 struct usb_serial_port *port = tty->driver_data;
180
181 dbg("%s cmd 0x%04x", __func__, cmd);
182
183 switch (cmd) {
184 case TIOCGSERIAL:
185 return get_serial_info(port,
186 (struct serial_struct __user *) arg);
187 case TIOCSSERIAL:
188 return set_serial_info(port,
189 (struct serial_struct __user *) arg);
190 default:
191 break;
192 }
193
194 dbg("%s arg not supported", __func__);
195
196 return -ENOIOCTLCMD;
197}
198EXPORT_SYMBOL(usb_wwan_ioctl);
199
200/* Write */
201int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
202 const unsigned char *buf, int count)
203{
204 struct usb_wwan_port_private *portdata;
205 struct usb_wwan_intf_private *intfdata;
206 int i;
207 int left, todo;
208 struct urb *this_urb = NULL; /* spurious */
209 int err;
210 unsigned long flags;
211
212 portdata = usb_get_serial_port_data(port);
213 intfdata = port->serial->private;
214
215 dbg("%s: write (%d chars)", __func__, count);
216
217 i = 0;
218 left = count;
219 for (i = 0; left > 0 && i < N_OUT_URB; i++) {
220 todo = left;
221 if (todo > OUT_BUFLEN)
222 todo = OUT_BUFLEN;
223
224 this_urb = portdata->out_urbs[i];
225 if (test_and_set_bit(i, &portdata->out_busy)) {
226 if (time_before(jiffies,
227 portdata->tx_start_time[i] + 10 * HZ))
228 continue;
229 usb_unlink_urb(this_urb);
230 continue;
231 }
232 dbg("%s: endpoint %d buf %d", __func__,
233 usb_pipeendpoint(this_urb->pipe), i);
234
235 err = usb_autopm_get_interface_async(port->serial->interface);
236 if (err < 0)
237 break;
238
239 /* send the data */
240 memcpy(this_urb->transfer_buffer, buf, todo);
241 this_urb->transfer_buffer_length = todo;
242
243 spin_lock_irqsave(&intfdata->susp_lock, flags);
244 if (intfdata->suspended) {
245 usb_anchor_urb(this_urb, &portdata->delayed);
246 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
247 } else {
248 intfdata->in_flight++;
249 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
250 err = usb_submit_urb(this_urb, GFP_ATOMIC);
251 if (err) {
252 dbg("usb_submit_urb %p (write bulk) failed "
253 "(%d)", this_urb, err);
254 clear_bit(i, &portdata->out_busy);
255 spin_lock_irqsave(&intfdata->susp_lock, flags);
256 intfdata->in_flight--;
257 spin_unlock_irqrestore(&intfdata->susp_lock,
258 flags);
259 usb_autopm_put_interface_async(port->serial->interface);
260 break;
261 }
262 }
263
264 portdata->tx_start_time[i] = jiffies;
265 buf += todo;
266 left -= todo;
267 }
268
269 count -= left;
270 dbg("%s: wrote (did %d)", __func__, count);
271 return count;
272}
273EXPORT_SYMBOL(usb_wwan_write);
274
275static void usb_wwan_indat_callback(struct urb *urb)
276{
277 int err;
278 int endpoint;
279 struct usb_serial_port *port;
280 struct tty_struct *tty;
281 unsigned char *data = urb->transfer_buffer;
282 int status = urb->status;
283
284 endpoint = usb_pipeendpoint(urb->pipe);
285 port = urb->context;
286
287 if (status) {
288 dbg("%s: nonzero status: %d on endpoint %02x.",
289 __func__, status, endpoint);
290 } else {
291 tty = tty_port_tty_get(&port->port);
292 if (tty) {
293 if (urb->actual_length) {
294 tty_insert_flip_string(tty, data,
295 urb->actual_length);
296 tty_flip_buffer_push(tty);
297 } else
298 dbg("%s: empty read urb received", __func__);
299 tty_kref_put(tty);
300 }
301
302 /* Resubmit urb so we continue receiving */
303 err = usb_submit_urb(urb, GFP_ATOMIC);
304 if (err) {
305 if (err != -EPERM) {
306 printk(KERN_ERR "%s: resubmit read urb failed. "
307 "(%d)", __func__, err);
308 /* busy also in error unless we are killed */
309 usb_mark_last_busy(port->serial->dev);
310 }
311 } else {
312 usb_mark_last_busy(port->serial->dev);
313 }
314 }
315}
316
317static void usb_wwan_outdat_callback(struct urb *urb)
318{
319 struct usb_serial_port *port;
320 struct usb_wwan_port_private *portdata;
321 struct usb_wwan_intf_private *intfdata;
322 int i;
323
324 port = urb->context;
325 intfdata = port->serial->private;
326
327 usb_serial_port_softint(port);
328 usb_autopm_put_interface_async(port->serial->interface);
329 portdata = usb_get_serial_port_data(port);
330 spin_lock(&intfdata->susp_lock);
331 intfdata->in_flight--;
332 spin_unlock(&intfdata->susp_lock);
333
334 for (i = 0; i < N_OUT_URB; ++i) {
335 if (portdata->out_urbs[i] == urb) {
336 smp_mb__before_clear_bit();
337 clear_bit(i, &portdata->out_busy);
338 break;
339 }
340 }
341}
342
343int usb_wwan_write_room(struct tty_struct *tty)
344{
345 struct usb_serial_port *port = tty->driver_data;
346 struct usb_wwan_port_private *portdata;
347 int i;
348 int data_len = 0;
349 struct urb *this_urb;
350
351 portdata = usb_get_serial_port_data(port);
352
353 for (i = 0; i < N_OUT_URB; i++) {
354 this_urb = portdata->out_urbs[i];
355 if (this_urb && !test_bit(i, &portdata->out_busy))
356 data_len += OUT_BUFLEN;
357 }
358
359 dbg("%s: %d", __func__, data_len);
360 return data_len;
361}
362EXPORT_SYMBOL(usb_wwan_write_room);
363
364int usb_wwan_chars_in_buffer(struct tty_struct *tty)
365{
366 struct usb_serial_port *port = tty->driver_data;
367 struct usb_wwan_port_private *portdata;
368 int i;
369 int data_len = 0;
370 struct urb *this_urb;
371
372 portdata = usb_get_serial_port_data(port);
373
374 for (i = 0; i < N_OUT_URB; i++) {
375 this_urb = portdata->out_urbs[i];
376 /* FIXME: This locking is insufficient as this_urb may
377 go unused during the test */
378 if (this_urb && test_bit(i, &portdata->out_busy))
379 data_len += this_urb->transfer_buffer_length;
380 }
381 dbg("%s: %d", __func__, data_len);
382 return data_len;
383}
384EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
385
386int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
387{
388 struct usb_wwan_port_private *portdata;
389 struct usb_wwan_intf_private *intfdata;
390 struct usb_serial *serial = port->serial;
391 int i, err;
392 struct urb *urb;
393
394 portdata = usb_get_serial_port_data(port);
395 intfdata = serial->private;
396
397 /* Start reading from the IN endpoint */
398 for (i = 0; i < N_IN_URB; i++) {
399 urb = portdata->in_urbs[i];
400 if (!urb)
401 continue;
402 err = usb_submit_urb(urb, GFP_KERNEL);
403 if (err) {
404 dbg("%s: submit urb %d failed (%d) %d",
405 __func__, i, err, urb->transfer_buffer_length);
406 }
407 }
408
409 if (intfdata->send_setup)
410 intfdata->send_setup(port);
411
412 serial->interface->needs_remote_wakeup = 1;
413 spin_lock_irq(&intfdata->susp_lock);
414 portdata->opened = 1;
415 spin_unlock_irq(&intfdata->susp_lock);
416 /* this balances a get in the generic USB serial code */
417 usb_autopm_put_interface(serial->interface);
418
419 return 0;
420}
421EXPORT_SYMBOL(usb_wwan_open);
422
423void usb_wwan_close(struct usb_serial_port *port)
424{
425 int i;
426 struct usb_serial *serial = port->serial;
427 struct usb_wwan_port_private *portdata;
428 struct usb_wwan_intf_private *intfdata = port->serial->private;
429
430 portdata = usb_get_serial_port_data(port);
431
432 if (serial->dev) {
433 /* Stop reading/writing urbs */
434 spin_lock_irq(&intfdata->susp_lock);
435 portdata->opened = 0;
436 spin_unlock_irq(&intfdata->susp_lock);
437
438 for (i = 0; i < N_IN_URB; i++)
439 usb_kill_urb(portdata->in_urbs[i]);
440 for (i = 0; i < N_OUT_URB; i++)
441 usb_kill_urb(portdata->out_urbs[i]);
442 /* balancing - important as an error cannot be handled*/
443 usb_autopm_get_interface_no_resume(serial->interface);
444 serial->interface->needs_remote_wakeup = 0;
445 }
446}
447EXPORT_SYMBOL(usb_wwan_close);
448
449/* Helper functions used by usb_wwan_setup_urbs */
450static struct urb *usb_wwan_setup_urb(struct usb_serial *serial, int endpoint,
451 int dir, void *ctx, char *buf, int len,
452 void (*callback) (struct urb *))
453{
454 struct urb *urb;
455
456 if (endpoint == -1)
457 return NULL; /* endpoint not needed */
458
459 urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
460 if (urb == NULL) {
461 dbg("%s: alloc for endpoint %d failed.", __func__, endpoint);
462 return NULL;
463 }
464
465 /* Fill URB using supplied data. */
466 usb_fill_bulk_urb(urb, serial->dev,
467 usb_sndbulkpipe(serial->dev, endpoint) | dir,
468 buf, len, callback, ctx);
469
470 return urb;
471}
472
473/* Setup urbs */
474static void usb_wwan_setup_urbs(struct usb_serial *serial)
475{
476 int i, j;
477 struct usb_serial_port *port;
478 struct usb_wwan_port_private *portdata;
479
480 for (i = 0; i < serial->num_ports; i++) {
481 port = serial->port[i];
482 portdata = usb_get_serial_port_data(port);
483
484 /* Do indat endpoints first */
485 for (j = 0; j < N_IN_URB; ++j) {
486 portdata->in_urbs[j] = usb_wwan_setup_urb(serial,
487 port->
488 bulk_in_endpointAddress,
489 USB_DIR_IN,
490 port,
491 portdata->
492 in_buffer[j],
493 IN_BUFLEN,
494 usb_wwan_indat_callback);
495 }
496
497 /* outdat endpoints */
498 for (j = 0; j < N_OUT_URB; ++j) {
499 portdata->out_urbs[j] = usb_wwan_setup_urb(serial,
500 port->
501 bulk_out_endpointAddress,
502 USB_DIR_OUT,
503 port,
504 portdata->
505 out_buffer
506 [j],
507 OUT_BUFLEN,
508 usb_wwan_outdat_callback);
509 }
510 }
511}
512
513int usb_wwan_startup(struct usb_serial *serial)
514{
515 int i, j, err;
516 struct usb_serial_port *port;
517 struct usb_wwan_port_private *portdata;
518 u8 *buffer;
519
520 /* Now setup per port private data */
521 for (i = 0; i < serial->num_ports; i++) {
522 port = serial->port[i];
523 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
524 if (!portdata) {
525 dbg("%s: kmalloc for usb_wwan_port_private (%d) failed!.",
526 __func__, i);
527 return 1;
528 }
529 init_usb_anchor(&portdata->delayed);
530
531 for (j = 0; j < N_IN_URB; j++) {
532 buffer = (u8 *) __get_free_page(GFP_KERNEL);
533 if (!buffer)
534 goto bail_out_error;
535 portdata->in_buffer[j] = buffer;
536 }
537
538 for (j = 0; j < N_OUT_URB; j++) {
539 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
540 if (!buffer)
541 goto bail_out_error2;
542 portdata->out_buffer[j] = buffer;
543 }
544
545 usb_set_serial_port_data(port, portdata);
546
547 if (!port->interrupt_in_urb)
548 continue;
549 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
550 if (err)
551 dbg("%s: submit irq_in urb failed %d", __func__, err);
552 }
553 usb_wwan_setup_urbs(serial);
554 return 0;
555
556bail_out_error2:
557 for (j = 0; j < N_OUT_URB; j++)
558 kfree(portdata->out_buffer[j]);
559bail_out_error:
560 for (j = 0; j < N_IN_URB; j++)
561 if (portdata->in_buffer[j])
562 free_page((unsigned long)portdata->in_buffer[j]);
563 kfree(portdata);
564 return 1;
565}
566EXPORT_SYMBOL(usb_wwan_startup);
567
568static void stop_read_write_urbs(struct usb_serial *serial)
569{
570 int i, j;
571 struct usb_serial_port *port;
572 struct usb_wwan_port_private *portdata;
573
574 /* Stop reading/writing urbs */
575 for (i = 0; i < serial->num_ports; ++i) {
576 port = serial->port[i];
577 portdata = usb_get_serial_port_data(port);
578 for (j = 0; j < N_IN_URB; j++)
579 usb_kill_urb(portdata->in_urbs[j]);
580 for (j = 0; j < N_OUT_URB; j++)
581 usb_kill_urb(portdata->out_urbs[j]);
582 }
583}
584
585void usb_wwan_disconnect(struct usb_serial *serial)
586{
587 stop_read_write_urbs(serial);
588}
589EXPORT_SYMBOL(usb_wwan_disconnect);
590
591void usb_wwan_release(struct usb_serial *serial)
592{
593 int i, j;
594 struct usb_serial_port *port;
595 struct usb_wwan_port_private *portdata;
596
597 /* Now free them */
598 for (i = 0; i < serial->num_ports; ++i) {
599 port = serial->port[i];
600 portdata = usb_get_serial_port_data(port);
601
602 for (j = 0; j < N_IN_URB; j++) {
603 usb_free_urb(portdata->in_urbs[j]);
604 free_page((unsigned long)
605 portdata->in_buffer[j]);
606 portdata->in_urbs[j] = NULL;
607 }
608 for (j = 0; j < N_OUT_URB; j++) {
609 usb_free_urb(portdata->out_urbs[j]);
610 kfree(portdata->out_buffer[j]);
611 portdata->out_urbs[j] = NULL;
612 }
613 }
614
615 /* Now free per port private data */
616 for (i = 0; i < serial->num_ports; i++) {
617 port = serial->port[i];
618 kfree(usb_get_serial_port_data(port));
619 }
620}
621EXPORT_SYMBOL(usb_wwan_release);
622
623#ifdef CONFIG_PM
624int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
625{
626 struct usb_wwan_intf_private *intfdata = serial->private;
627 int b;
628
629 if (PMSG_IS_AUTO(message)) {
630 spin_lock_irq(&intfdata->susp_lock);
631 b = intfdata->in_flight;
632 spin_unlock_irq(&intfdata->susp_lock);
633
634 if (b)
635 return -EBUSY;
636 }
637
638 spin_lock_irq(&intfdata->susp_lock);
639 intfdata->suspended = 1;
640 spin_unlock_irq(&intfdata->susp_lock);
641 stop_read_write_urbs(serial);
642
643 return 0;
644}
645EXPORT_SYMBOL(usb_wwan_suspend);
646
647static void unbusy_queued_urb(struct urb *urb, struct usb_wwan_port_private *portdata)
648{
649 int i;
650
651 for (i = 0; i < N_OUT_URB; i++) {
652 if (urb == portdata->out_urbs[i]) {
653 clear_bit(i, &portdata->out_busy);
654 break;
655 }
656 }
657}
658
659static void play_delayed(struct usb_serial_port *port)
660{
661 struct usb_wwan_intf_private *data;
662 struct usb_wwan_port_private *portdata;
663 struct urb *urb;
664 int err;
665
666 portdata = usb_get_serial_port_data(port);
667 data = port->serial->private;
668 while ((urb = usb_get_from_anchor(&portdata->delayed))) {
669 err = usb_submit_urb(urb, GFP_ATOMIC);
670 if (!err) {
671 data->in_flight++;
672 } else {
673 /* we have to throw away the rest */
674 do {
675 unbusy_queued_urb(urb, portdata);
676 usb_autopm_put_interface_no_suspend(port->serial->interface);
677 } while ((urb = usb_get_from_anchor(&portdata->delayed)));
678 break;
679 }
680 }
681}
682
683int usb_wwan_resume(struct usb_serial *serial)
684{
685 int i, j;
686 struct usb_serial_port *port;
687 struct usb_wwan_intf_private *intfdata = serial->private;
688 struct usb_wwan_port_private *portdata;
689 struct urb *urb;
690 int err = 0;
691
692 /* get the interrupt URBs resubmitted unconditionally */
693 for (i = 0; i < serial->num_ports; i++) {
694 port = serial->port[i];
695 if (!port->interrupt_in_urb) {
696 dbg("%s: No interrupt URB for port %d", __func__, i);
697 continue;
698 }
699 err = usb_submit_urb(port->interrupt_in_urb, GFP_NOIO);
700 dbg("Submitted interrupt URB for port %d (result %d)", i, err);
701 if (err < 0) {
702 dev_err(&port->dev, "%s: Error %d for interrupt URB\n",
703 __func__, err);
704 goto err_out;
705 }
706 }
707
708 for (i = 0; i < serial->num_ports; i++) {
709 /* walk all ports */
710 port = serial->port[i];
711 portdata = usb_get_serial_port_data(port);
712
713 /* skip closed ports */
714 spin_lock_irq(&intfdata->susp_lock);
715 if (!portdata->opened) {
716 spin_unlock_irq(&intfdata->susp_lock);
717 continue;
718 }
719
720 for (j = 0; j < N_IN_URB; j++) {
721 urb = portdata->in_urbs[j];
722 err = usb_submit_urb(urb, GFP_ATOMIC);
723 if (err < 0) {
724 dev_err(&port->dev, "%s: Error %d for bulk URB %d\n",
725 __func__, err, i);
726 spin_unlock_irq(&intfdata->susp_lock);
727 goto err_out;
728 }
729 }
730 play_delayed(port);
731 spin_unlock_irq(&intfdata->susp_lock);
732 }
733 spin_lock_irq(&intfdata->susp_lock);
734 intfdata->suspended = 0;
735 spin_unlock_irq(&intfdata->susp_lock);
736err_out:
737 return err;
738}
739EXPORT_SYMBOL(usb_wwan_resume);
740#endif
741
742MODULE_AUTHOR(DRIVER_AUTHOR);
743MODULE_DESCRIPTION(DRIVER_DESC);
744MODULE_VERSION(DRIVER_VERSION);
745MODULE_LICENSE("GPL");
746
747module_param(debug, bool, S_IRUGO | S_IWUSR);
748MODULE_PARM_DESC(debug, "Debug messages");