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1// SPDX-License-Identifier: GPL-2.0
2/*
3 USB Driver layer for GSM modems
4
5 Copyright (C) 2005 Matthias Urlichs <smurf@smurf.noris.de>
6
7 Portions copied from the Keyspan driver by Hugh Blemings <hugh@blemings.org>
8
9 History: see the git log.
10
11 Work sponsored by: Sigos GmbH, Germany <info@sigos.de>
12
13 This driver exists because the "normal" serial driver doesn't work too well
14 with GSM modems. Issues:
15 - data loss -- one single Receive URB is not nearly enough
16 - controlling the baud rate doesn't make sense
17*/
18
19#define DRIVER_AUTHOR "Matthias Urlichs <smurf@smurf.noris.de>"
20#define DRIVER_DESC "USB Driver for GSM modems"
21
22#include <linux/kernel.h>
23#include <linux/jiffies.h>
24#include <linux/errno.h>
25#include <linux/slab.h>
26#include <linux/tty.h>
27#include <linux/tty_flip.h>
28#include <linux/module.h>
29#include <linux/bitops.h>
30#include <linux/uaccess.h>
31#include <linux/usb.h>
32#include <linux/usb/cdc.h>
33#include <linux/usb/serial.h>
34#include <linux/serial.h>
35#include "usb-wwan.h"
36
37/*
38 * Generate DTR/RTS signals on the port using the SET_CONTROL_LINE_STATE request
39 * in CDC ACM.
40 */
41static int usb_wwan_send_setup(struct usb_serial_port *port)
42{
43 struct usb_serial *serial = port->serial;
44 struct usb_wwan_port_private *portdata;
45 int val = 0;
46 int ifnum;
47 int res;
48
49 portdata = usb_get_serial_port_data(port);
50
51 if (portdata->dtr_state)
52 val |= USB_CDC_CTRL_DTR;
53 if (portdata->rts_state)
54 val |= USB_CDC_CTRL_RTS;
55
56 ifnum = serial->interface->cur_altsetting->desc.bInterfaceNumber;
57
58 res = usb_autopm_get_interface(serial->interface);
59 if (res)
60 return res;
61
62 res = usb_control_msg(serial->dev, usb_sndctrlpipe(serial->dev, 0),
63 USB_CDC_REQ_SET_CONTROL_LINE_STATE,
64 USB_DIR_OUT | USB_TYPE_CLASS | USB_RECIP_INTERFACE,
65 val, ifnum, NULL, 0, USB_CTRL_SET_TIMEOUT);
66
67 usb_autopm_put_interface(port->serial->interface);
68
69 return res;
70}
71
72void usb_wwan_dtr_rts(struct usb_serial_port *port, int on)
73{
74 struct usb_wwan_port_private *portdata;
75 struct usb_wwan_intf_private *intfdata;
76
77 intfdata = usb_get_serial_data(port->serial);
78
79 if (!intfdata->use_send_setup)
80 return;
81
82 portdata = usb_get_serial_port_data(port);
83 /* FIXME: locking */
84 portdata->rts_state = on;
85 portdata->dtr_state = on;
86
87 usb_wwan_send_setup(port);
88}
89EXPORT_SYMBOL(usb_wwan_dtr_rts);
90
91int usb_wwan_tiocmget(struct tty_struct *tty)
92{
93 struct usb_serial_port *port = tty->driver_data;
94 unsigned int value;
95 struct usb_wwan_port_private *portdata;
96
97 portdata = usb_get_serial_port_data(port);
98
99 value = ((portdata->rts_state) ? TIOCM_RTS : 0) |
100 ((portdata->dtr_state) ? TIOCM_DTR : 0) |
101 ((portdata->cts_state) ? TIOCM_CTS : 0) |
102 ((portdata->dsr_state) ? TIOCM_DSR : 0) |
103 ((portdata->dcd_state) ? TIOCM_CAR : 0) |
104 ((portdata->ri_state) ? TIOCM_RNG : 0);
105
106 return value;
107}
108EXPORT_SYMBOL(usb_wwan_tiocmget);
109
110int usb_wwan_tiocmset(struct tty_struct *tty,
111 unsigned int set, unsigned int clear)
112{
113 struct usb_serial_port *port = tty->driver_data;
114 struct usb_wwan_port_private *portdata;
115 struct usb_wwan_intf_private *intfdata;
116
117 portdata = usb_get_serial_port_data(port);
118 intfdata = usb_get_serial_data(port->serial);
119
120 if (!intfdata->use_send_setup)
121 return -EINVAL;
122
123 /* FIXME: what locks portdata fields ? */
124 if (set & TIOCM_RTS)
125 portdata->rts_state = 1;
126 if (set & TIOCM_DTR)
127 portdata->dtr_state = 1;
128
129 if (clear & TIOCM_RTS)
130 portdata->rts_state = 0;
131 if (clear & TIOCM_DTR)
132 portdata->dtr_state = 0;
133 return usb_wwan_send_setup(port);
134}
135EXPORT_SYMBOL(usb_wwan_tiocmset);
136
137int usb_wwan_write(struct tty_struct *tty, struct usb_serial_port *port,
138 const unsigned char *buf, int count)
139{
140 struct usb_wwan_port_private *portdata;
141 struct usb_wwan_intf_private *intfdata;
142 int i;
143 int left, todo;
144 struct urb *this_urb = NULL; /* spurious */
145 int err;
146 unsigned long flags;
147
148 portdata = usb_get_serial_port_data(port);
149 intfdata = usb_get_serial_data(port->serial);
150
151 dev_dbg(&port->dev, "%s: write (%d chars)\n", __func__, count);
152
153 left = count;
154 for (i = 0; left > 0 && i < N_OUT_URB; i++) {
155 todo = left;
156 if (todo > OUT_BUFLEN)
157 todo = OUT_BUFLEN;
158
159 this_urb = portdata->out_urbs[i];
160 if (test_and_set_bit(i, &portdata->out_busy)) {
161 if (time_before(jiffies,
162 portdata->tx_start_time[i] + 10 * HZ))
163 continue;
164 usb_unlink_urb(this_urb);
165 continue;
166 }
167 dev_dbg(&port->dev, "%s: endpoint %d buf %d\n", __func__,
168 usb_pipeendpoint(this_urb->pipe), i);
169
170 err = usb_autopm_get_interface_async(port->serial->interface);
171 if (err < 0) {
172 clear_bit(i, &portdata->out_busy);
173 break;
174 }
175
176 /* send the data */
177 memcpy(this_urb->transfer_buffer, buf, todo);
178 this_urb->transfer_buffer_length = todo;
179
180 spin_lock_irqsave(&intfdata->susp_lock, flags);
181 if (intfdata->suspended) {
182 usb_anchor_urb(this_urb, &portdata->delayed);
183 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
184 } else {
185 intfdata->in_flight++;
186 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
187 err = usb_submit_urb(this_urb, GFP_ATOMIC);
188 if (err) {
189 dev_err(&port->dev,
190 "%s: submit urb %d failed: %d\n",
191 __func__, i, err);
192 clear_bit(i, &portdata->out_busy);
193 spin_lock_irqsave(&intfdata->susp_lock, flags);
194 intfdata->in_flight--;
195 spin_unlock_irqrestore(&intfdata->susp_lock,
196 flags);
197 usb_autopm_put_interface_async(port->serial->interface);
198 break;
199 }
200 }
201
202 portdata->tx_start_time[i] = jiffies;
203 buf += todo;
204 left -= todo;
205 }
206
207 count -= left;
208 dev_dbg(&port->dev, "%s: wrote (did %d)\n", __func__, count);
209 return count;
210}
211EXPORT_SYMBOL(usb_wwan_write);
212
213static void usb_wwan_indat_callback(struct urb *urb)
214{
215 int err;
216 int endpoint;
217 struct usb_serial_port *port;
218 struct device *dev;
219 unsigned char *data = urb->transfer_buffer;
220 int status = urb->status;
221
222 endpoint = usb_pipeendpoint(urb->pipe);
223 port = urb->context;
224 dev = &port->dev;
225
226 if (status) {
227 dev_dbg(dev, "%s: nonzero status: %d on endpoint %02x.\n",
228 __func__, status, endpoint);
229
230 /* don't resubmit on fatal errors */
231 if (status == -ESHUTDOWN || status == -ENOENT)
232 return;
233 } else {
234 if (urb->actual_length) {
235 tty_insert_flip_string(&port->port, data,
236 urb->actual_length);
237 tty_flip_buffer_push(&port->port);
238 } else
239 dev_dbg(dev, "%s: empty read urb received\n", __func__);
240 }
241 /* Resubmit urb so we continue receiving */
242 err = usb_submit_urb(urb, GFP_ATOMIC);
243 if (err) {
244 if (err != -EPERM && err != -ENODEV) {
245 dev_err(dev, "%s: resubmit read urb failed. (%d)\n",
246 __func__, err);
247 /* busy also in error unless we are killed */
248 usb_mark_last_busy(port->serial->dev);
249 }
250 } else {
251 usb_mark_last_busy(port->serial->dev);
252 }
253}
254
255static void usb_wwan_outdat_callback(struct urb *urb)
256{
257 struct usb_serial_port *port;
258 struct usb_wwan_port_private *portdata;
259 struct usb_wwan_intf_private *intfdata;
260 unsigned long flags;
261 int i;
262
263 port = urb->context;
264 intfdata = usb_get_serial_data(port->serial);
265
266 usb_serial_port_softint(port);
267 usb_autopm_put_interface_async(port->serial->interface);
268 portdata = usb_get_serial_port_data(port);
269 spin_lock_irqsave(&intfdata->susp_lock, flags);
270 intfdata->in_flight--;
271 spin_unlock_irqrestore(&intfdata->susp_lock, flags);
272
273 for (i = 0; i < N_OUT_URB; ++i) {
274 if (portdata->out_urbs[i] == urb) {
275 smp_mb__before_atomic();
276 clear_bit(i, &portdata->out_busy);
277 break;
278 }
279 }
280}
281
282unsigned int usb_wwan_write_room(struct tty_struct *tty)
283{
284 struct usb_serial_port *port = tty->driver_data;
285 struct usb_wwan_port_private *portdata;
286 int i;
287 unsigned int data_len = 0;
288 struct urb *this_urb;
289
290 portdata = usb_get_serial_port_data(port);
291
292 for (i = 0; i < N_OUT_URB; i++) {
293 this_urb = portdata->out_urbs[i];
294 if (this_urb && !test_bit(i, &portdata->out_busy))
295 data_len += OUT_BUFLEN;
296 }
297
298 dev_dbg(&port->dev, "%s: %u\n", __func__, data_len);
299 return data_len;
300}
301EXPORT_SYMBOL(usb_wwan_write_room);
302
303unsigned int usb_wwan_chars_in_buffer(struct tty_struct *tty)
304{
305 struct usb_serial_port *port = tty->driver_data;
306 struct usb_wwan_port_private *portdata;
307 int i;
308 unsigned int data_len = 0;
309 struct urb *this_urb;
310
311 portdata = usb_get_serial_port_data(port);
312
313 for (i = 0; i < N_OUT_URB; i++) {
314 this_urb = portdata->out_urbs[i];
315 /* FIXME: This locking is insufficient as this_urb may
316 go unused during the test */
317 if (this_urb && test_bit(i, &portdata->out_busy))
318 data_len += this_urb->transfer_buffer_length;
319 }
320 dev_dbg(&port->dev, "%s: %u\n", __func__, data_len);
321 return data_len;
322}
323EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
324
325int usb_wwan_open(struct tty_struct *tty, struct usb_serial_port *port)
326{
327 struct usb_wwan_port_private *portdata;
328 struct usb_wwan_intf_private *intfdata;
329 struct usb_serial *serial = port->serial;
330 int i, err;
331 struct urb *urb;
332
333 portdata = usb_get_serial_port_data(port);
334 intfdata = usb_get_serial_data(serial);
335
336 if (port->interrupt_in_urb) {
337 err = usb_submit_urb(port->interrupt_in_urb, GFP_KERNEL);
338 if (err) {
339 dev_err(&port->dev, "%s: submit int urb failed: %d\n",
340 __func__, err);
341 }
342 }
343
344 /* Start reading from the IN endpoint */
345 for (i = 0; i < N_IN_URB; i++) {
346 urb = portdata->in_urbs[i];
347 if (!urb)
348 continue;
349 err = usb_submit_urb(urb, GFP_KERNEL);
350 if (err) {
351 dev_err(&port->dev,
352 "%s: submit read urb %d failed: %d\n",
353 __func__, i, err);
354 }
355 }
356
357 spin_lock_irq(&intfdata->susp_lock);
358 if (++intfdata->open_ports == 1)
359 serial->interface->needs_remote_wakeup = 1;
360 spin_unlock_irq(&intfdata->susp_lock);
361 /* this balances a get in the generic USB serial code */
362 usb_autopm_put_interface(serial->interface);
363
364 return 0;
365}
366EXPORT_SYMBOL(usb_wwan_open);
367
368static void unbusy_queued_urb(struct urb *urb,
369 struct usb_wwan_port_private *portdata)
370{
371 int i;
372
373 for (i = 0; i < N_OUT_URB; i++) {
374 if (urb == portdata->out_urbs[i]) {
375 clear_bit(i, &portdata->out_busy);
376 break;
377 }
378 }
379}
380
381void usb_wwan_close(struct usb_serial_port *port)
382{
383 int i;
384 struct usb_serial *serial = port->serial;
385 struct usb_wwan_port_private *portdata;
386 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
387 struct urb *urb;
388
389 portdata = usb_get_serial_port_data(port);
390
391 /*
392 * Need to take susp_lock to make sure port is not already being
393 * resumed, but no need to hold it due to the tty-port initialized
394 * flag.
395 */
396 spin_lock_irq(&intfdata->susp_lock);
397 if (--intfdata->open_ports == 0)
398 serial->interface->needs_remote_wakeup = 0;
399 spin_unlock_irq(&intfdata->susp_lock);
400
401 for (;;) {
402 urb = usb_get_from_anchor(&portdata->delayed);
403 if (!urb)
404 break;
405 unbusy_queued_urb(urb, portdata);
406 usb_autopm_put_interface_async(serial->interface);
407 }
408
409 for (i = 0; i < N_IN_URB; i++)
410 usb_kill_urb(portdata->in_urbs[i]);
411 for (i = 0; i < N_OUT_URB; i++)
412 usb_kill_urb(portdata->out_urbs[i]);
413 usb_kill_urb(port->interrupt_in_urb);
414
415 usb_autopm_get_interface_no_resume(serial->interface);
416}
417EXPORT_SYMBOL(usb_wwan_close);
418
419static struct urb *usb_wwan_setup_urb(struct usb_serial_port *port,
420 int endpoint,
421 int dir, void *ctx, char *buf, int len,
422 void (*callback) (struct urb *))
423{
424 struct usb_serial *serial = port->serial;
425 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
426 struct urb *urb;
427
428 urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
429 if (!urb)
430 return NULL;
431
432 usb_fill_bulk_urb(urb, serial->dev,
433 usb_sndbulkpipe(serial->dev, endpoint) | dir,
434 buf, len, callback, ctx);
435
436 if (intfdata->use_zlp && dir == USB_DIR_OUT)
437 urb->transfer_flags |= URB_ZERO_PACKET;
438
439 return urb;
440}
441
442int usb_wwan_port_probe(struct usb_serial_port *port)
443{
444 struct usb_wwan_port_private *portdata;
445 struct urb *urb;
446 u8 *buffer;
447 int i;
448
449 if (!port->bulk_in_size || !port->bulk_out_size)
450 return -ENODEV;
451
452 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
453 if (!portdata)
454 return -ENOMEM;
455
456 init_usb_anchor(&portdata->delayed);
457
458 for (i = 0; i < N_IN_URB; i++) {
459 buffer = (u8 *)__get_free_page(GFP_KERNEL);
460 if (!buffer)
461 goto bail_out_error;
462 portdata->in_buffer[i] = buffer;
463
464 urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress,
465 USB_DIR_IN, port,
466 buffer, IN_BUFLEN,
467 usb_wwan_indat_callback);
468 portdata->in_urbs[i] = urb;
469 }
470
471 for (i = 0; i < N_OUT_URB; i++) {
472 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
473 if (!buffer)
474 goto bail_out_error2;
475 portdata->out_buffer[i] = buffer;
476
477 urb = usb_wwan_setup_urb(port, port->bulk_out_endpointAddress,
478 USB_DIR_OUT, port,
479 buffer, OUT_BUFLEN,
480 usb_wwan_outdat_callback);
481 portdata->out_urbs[i] = urb;
482 }
483
484 usb_set_serial_port_data(port, portdata);
485
486 return 0;
487
488bail_out_error2:
489 for (i = 0; i < N_OUT_URB; i++) {
490 usb_free_urb(portdata->out_urbs[i]);
491 kfree(portdata->out_buffer[i]);
492 }
493bail_out_error:
494 for (i = 0; i < N_IN_URB; i++) {
495 usb_free_urb(portdata->in_urbs[i]);
496 free_page((unsigned long)portdata->in_buffer[i]);
497 }
498 kfree(portdata);
499
500 return -ENOMEM;
501}
502EXPORT_SYMBOL_GPL(usb_wwan_port_probe);
503
504void usb_wwan_port_remove(struct usb_serial_port *port)
505{
506 int i;
507 struct usb_wwan_port_private *portdata;
508
509 portdata = usb_get_serial_port_data(port);
510 usb_set_serial_port_data(port, NULL);
511
512 for (i = 0; i < N_IN_URB; i++) {
513 usb_free_urb(portdata->in_urbs[i]);
514 free_page((unsigned long)portdata->in_buffer[i]);
515 }
516 for (i = 0; i < N_OUT_URB; i++) {
517 usb_free_urb(portdata->out_urbs[i]);
518 kfree(portdata->out_buffer[i]);
519 }
520
521 kfree(portdata);
522}
523EXPORT_SYMBOL(usb_wwan_port_remove);
524
525#ifdef CONFIG_PM
526static void stop_urbs(struct usb_serial *serial)
527{
528 int i, j;
529 struct usb_serial_port *port;
530 struct usb_wwan_port_private *portdata;
531
532 for (i = 0; i < serial->num_ports; ++i) {
533 port = serial->port[i];
534 portdata = usb_get_serial_port_data(port);
535 if (!portdata)
536 continue;
537 for (j = 0; j < N_IN_URB; j++)
538 usb_kill_urb(portdata->in_urbs[j]);
539 for (j = 0; j < N_OUT_URB; j++)
540 usb_kill_urb(portdata->out_urbs[j]);
541 usb_kill_urb(port->interrupt_in_urb);
542 }
543}
544
545int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
546{
547 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
548
549 spin_lock_irq(&intfdata->susp_lock);
550 if (PMSG_IS_AUTO(message)) {
551 if (intfdata->in_flight) {
552 spin_unlock_irq(&intfdata->susp_lock);
553 return -EBUSY;
554 }
555 }
556 intfdata->suspended = 1;
557 spin_unlock_irq(&intfdata->susp_lock);
558
559 stop_urbs(serial);
560
561 return 0;
562}
563EXPORT_SYMBOL(usb_wwan_suspend);
564
565/* Caller must hold susp_lock. */
566static int usb_wwan_submit_delayed_urbs(struct usb_serial_port *port)
567{
568 struct usb_serial *serial = port->serial;
569 struct usb_wwan_intf_private *data = usb_get_serial_data(serial);
570 struct usb_wwan_port_private *portdata;
571 struct urb *urb;
572 int err_count = 0;
573 int err;
574
575 portdata = usb_get_serial_port_data(port);
576
577 for (;;) {
578 urb = usb_get_from_anchor(&portdata->delayed);
579 if (!urb)
580 break;
581
582 err = usb_submit_urb(urb, GFP_ATOMIC);
583 if (err) {
584 dev_err(&port->dev, "%s: submit urb failed: %d\n",
585 __func__, err);
586 err_count++;
587 unbusy_queued_urb(urb, portdata);
588 usb_autopm_put_interface_async(serial->interface);
589 continue;
590 }
591 data->in_flight++;
592 }
593
594 if (err_count)
595 return -EIO;
596
597 return 0;
598}
599
600int usb_wwan_resume(struct usb_serial *serial)
601{
602 int i, j;
603 struct usb_serial_port *port;
604 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
605 struct usb_wwan_port_private *portdata;
606 struct urb *urb;
607 int err;
608 int err_count = 0;
609
610 spin_lock_irq(&intfdata->susp_lock);
611 for (i = 0; i < serial->num_ports; i++) {
612 port = serial->port[i];
613
614 if (!tty_port_initialized(&port->port))
615 continue;
616
617 portdata = usb_get_serial_port_data(port);
618
619 if (port->interrupt_in_urb) {
620 err = usb_submit_urb(port->interrupt_in_urb,
621 GFP_ATOMIC);
622 if (err) {
623 dev_err(&port->dev,
624 "%s: submit int urb failed: %d\n",
625 __func__, err);
626 err_count++;
627 }
628 }
629
630 err = usb_wwan_submit_delayed_urbs(port);
631 if (err)
632 err_count++;
633
634 for (j = 0; j < N_IN_URB; j++) {
635 urb = portdata->in_urbs[j];
636 err = usb_submit_urb(urb, GFP_ATOMIC);
637 if (err < 0) {
638 dev_err(&port->dev,
639 "%s: submit read urb %d failed: %d\n",
640 __func__, i, err);
641 err_count++;
642 }
643 }
644 }
645 intfdata->suspended = 0;
646 spin_unlock_irq(&intfdata->susp_lock);
647
648 if (err_count)
649 return -EIO;
650
651 return 0;
652}
653EXPORT_SYMBOL(usb_wwan_resume);
654#endif
655
656MODULE_AUTHOR(DRIVER_AUTHOR);
657MODULE_DESCRIPTION(DRIVER_DESC);
658MODULE_LICENSE("GPL v2");
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 */
43static 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
73void 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}
90EXPORT_SYMBOL(usb_wwan_dtr_rts);
91
92int 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}
109EXPORT_SYMBOL(usb_wwan_tiocmget);
110
111int 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}
136EXPORT_SYMBOL(usb_wwan_tiocmset);
137
138static 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
157static 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
188int 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}
210EXPORT_SYMBOL(usb_wwan_ioctl);
211
212int 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}
287EXPORT_SYMBOL(usb_wwan_write);
288
289static 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
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 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
353int 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}
372EXPORT_SYMBOL(usb_wwan_write_room);
373
374int 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}
394EXPORT_SYMBOL(usb_wwan_chars_in_buffer);
395
396int 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}
437EXPORT_SYMBOL(usb_wwan_open);
438
439static 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
452void 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}
487EXPORT_SYMBOL(usb_wwan_close);
488
489static 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 urb *urb;
496
497 urb = usb_alloc_urb(0, GFP_KERNEL); /* No ISO */
498 if (!urb)
499 return NULL;
500
501 usb_fill_bulk_urb(urb, serial->dev,
502 usb_sndbulkpipe(serial->dev, endpoint) | dir,
503 buf, len, callback, ctx);
504
505 return urb;
506}
507
508int usb_wwan_port_probe(struct usb_serial_port *port)
509{
510 struct usb_wwan_port_private *portdata;
511 struct urb *urb;
512 u8 *buffer;
513 int i;
514
515 if (!port->bulk_in_size || !port->bulk_out_size)
516 return -ENODEV;
517
518 portdata = kzalloc(sizeof(*portdata), GFP_KERNEL);
519 if (!portdata)
520 return -ENOMEM;
521
522 init_usb_anchor(&portdata->delayed);
523
524 for (i = 0; i < N_IN_URB; i++) {
525 buffer = (u8 *)__get_free_page(GFP_KERNEL);
526 if (!buffer)
527 goto bail_out_error;
528 portdata->in_buffer[i] = buffer;
529
530 urb = usb_wwan_setup_urb(port, port->bulk_in_endpointAddress,
531 USB_DIR_IN, port,
532 buffer, IN_BUFLEN,
533 usb_wwan_indat_callback);
534 portdata->in_urbs[i] = urb;
535 }
536
537 for (i = 0; i < N_OUT_URB; i++) {
538 buffer = kmalloc(OUT_BUFLEN, GFP_KERNEL);
539 if (!buffer)
540 goto bail_out_error2;
541 portdata->out_buffer[i] = buffer;
542
543 urb = usb_wwan_setup_urb(port, port->bulk_out_endpointAddress,
544 USB_DIR_OUT, port,
545 buffer, OUT_BUFLEN,
546 usb_wwan_outdat_callback);
547 portdata->out_urbs[i] = urb;
548 }
549
550 usb_set_serial_port_data(port, portdata);
551
552 return 0;
553
554bail_out_error2:
555 for (i = 0; i < N_OUT_URB; i++) {
556 usb_free_urb(portdata->out_urbs[i]);
557 kfree(portdata->out_buffer[i]);
558 }
559bail_out_error:
560 for (i = 0; i < N_IN_URB; i++) {
561 usb_free_urb(portdata->in_urbs[i]);
562 free_page((unsigned long)portdata->in_buffer[i]);
563 }
564 kfree(portdata);
565
566 return -ENOMEM;
567}
568EXPORT_SYMBOL_GPL(usb_wwan_port_probe);
569
570int usb_wwan_port_remove(struct usb_serial_port *port)
571{
572 int i;
573 struct usb_wwan_port_private *portdata;
574
575 portdata = usb_get_serial_port_data(port);
576 usb_set_serial_port_data(port, NULL);
577
578 for (i = 0; i < N_IN_URB; i++) {
579 usb_free_urb(portdata->in_urbs[i]);
580 free_page((unsigned long)portdata->in_buffer[i]);
581 }
582 for (i = 0; i < N_OUT_URB; i++) {
583 usb_free_urb(portdata->out_urbs[i]);
584 kfree(portdata->out_buffer[i]);
585 }
586
587 kfree(portdata);
588
589 return 0;
590}
591EXPORT_SYMBOL(usb_wwan_port_remove);
592
593#ifdef CONFIG_PM
594static void stop_urbs(struct usb_serial *serial)
595{
596 int i, j;
597 struct usb_serial_port *port;
598 struct usb_wwan_port_private *portdata;
599
600 for (i = 0; i < serial->num_ports; ++i) {
601 port = serial->port[i];
602 portdata = usb_get_serial_port_data(port);
603 if (!portdata)
604 continue;
605 for (j = 0; j < N_IN_URB; j++)
606 usb_kill_urb(portdata->in_urbs[j]);
607 for (j = 0; j < N_OUT_URB; j++)
608 usb_kill_urb(portdata->out_urbs[j]);
609 usb_kill_urb(port->interrupt_in_urb);
610 }
611}
612
613int usb_wwan_suspend(struct usb_serial *serial, pm_message_t message)
614{
615 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
616
617 spin_lock_irq(&intfdata->susp_lock);
618 if (PMSG_IS_AUTO(message)) {
619 if (intfdata->in_flight) {
620 spin_unlock_irq(&intfdata->susp_lock);
621 return -EBUSY;
622 }
623 }
624 intfdata->suspended = 1;
625 spin_unlock_irq(&intfdata->susp_lock);
626
627 stop_urbs(serial);
628
629 return 0;
630}
631EXPORT_SYMBOL(usb_wwan_suspend);
632
633/* Caller must hold susp_lock. */
634static int usb_wwan_submit_delayed_urbs(struct usb_serial_port *port)
635{
636 struct usb_serial *serial = port->serial;
637 struct usb_wwan_intf_private *data = usb_get_serial_data(serial);
638 struct usb_wwan_port_private *portdata;
639 struct urb *urb;
640 int err_count = 0;
641 int err;
642
643 portdata = usb_get_serial_port_data(port);
644
645 for (;;) {
646 urb = usb_get_from_anchor(&portdata->delayed);
647 if (!urb)
648 break;
649
650 err = usb_submit_urb(urb, GFP_ATOMIC);
651 if (err) {
652 dev_err(&port->dev, "%s: submit urb failed: %d\n",
653 __func__, err);
654 err_count++;
655 unbusy_queued_urb(urb, portdata);
656 usb_autopm_put_interface_async(serial->interface);
657 continue;
658 }
659 data->in_flight++;
660 }
661
662 if (err_count)
663 return -EIO;
664
665 return 0;
666}
667
668int usb_wwan_resume(struct usb_serial *serial)
669{
670 int i, j;
671 struct usb_serial_port *port;
672 struct usb_wwan_intf_private *intfdata = usb_get_serial_data(serial);
673 struct usb_wwan_port_private *portdata;
674 struct urb *urb;
675 int err;
676 int err_count = 0;
677
678 spin_lock_irq(&intfdata->susp_lock);
679 for (i = 0; i < serial->num_ports; i++) {
680 port = serial->port[i];
681
682 if (!tty_port_initialized(&port->port))
683 continue;
684
685 portdata = usb_get_serial_port_data(port);
686
687 if (port->interrupt_in_urb) {
688 err = usb_submit_urb(port->interrupt_in_urb,
689 GFP_ATOMIC);
690 if (err) {
691 dev_err(&port->dev,
692 "%s: submit int urb failed: %d\n",
693 __func__, err);
694 err_count++;
695 }
696 }
697
698 err = usb_wwan_submit_delayed_urbs(port);
699 if (err)
700 err_count++;
701
702 for (j = 0; j < N_IN_URB; j++) {
703 urb = portdata->in_urbs[j];
704 err = usb_submit_urb(urb, GFP_ATOMIC);
705 if (err < 0) {
706 dev_err(&port->dev,
707 "%s: submit read urb %d failed: %d\n",
708 __func__, i, err);
709 err_count++;
710 }
711 }
712 }
713 intfdata->suspended = 0;
714 spin_unlock_irq(&intfdata->susp_lock);
715
716 if (err_count)
717 return -EIO;
718
719 return 0;
720}
721EXPORT_SYMBOL(usb_wwan_resume);
722#endif
723
724MODULE_AUTHOR(DRIVER_AUTHOR);
725MODULE_DESCRIPTION(DRIVER_DESC);
726MODULE_LICENSE("GPL");