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UBUNTU: Ubuntu-4.15.0-96.97
[mirror_ubuntu-bionic-kernel.git] / drivers / isdn / gigaset / bas-gigaset.c
1 /*
2 * USB driver for Gigaset 307x base via direct USB connection.
3 *
4 * Copyright (c) 2001 by Hansjoerg Lipp <hjlipp@web.de>,
5 * Tilman Schmidt <tilman@imap.cc>,
6 * Stefan Eilers.
7 *
8 * =====================================================================
9 * This program is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU General Public License as
11 * published by the Free Software Foundation; either version 2 of
12 * the License, or (at your option) any later version.
13 * =====================================================================
14 */
15
16 #include "gigaset.h"
17 #include <linux/usb.h>
18 #include <linux/module.h>
19 #include <linux/moduleparam.h>
20
21 /* Version Information */
22 #define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
23 #define DRIVER_DESC "USB Driver for Gigaset 307x"
24
25
26 /* Module parameters */
27
28 static int startmode = SM_ISDN;
29 static int cidmode = 1;
30
31 module_param(startmode, int, S_IRUGO);
32 module_param(cidmode, int, S_IRUGO);
33 MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
34 MODULE_PARM_DESC(cidmode, "Call-ID mode");
35
36 #define GIGASET_MINORS 1
37 #define GIGASET_MINOR 16
38 #define GIGASET_MODULENAME "bas_gigaset"
39 #define GIGASET_DEVNAME "ttyGB"
40
41 /* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
42 #define IF_WRITEBUF 264
43
44 /* interrupt pipe message size according to ibid. ch. 2.2 */
45 #define IP_MSGSIZE 3
46
47 /* Values for the Gigaset 307x */
48 #define USB_GIGA_VENDOR_ID 0x0681
49 #define USB_3070_PRODUCT_ID 0x0001
50 #define USB_3075_PRODUCT_ID 0x0002
51 #define USB_SX303_PRODUCT_ID 0x0021
52 #define USB_SX353_PRODUCT_ID 0x0022
53
54 /* table of devices that work with this driver */
55 static const struct usb_device_id gigaset_table[] = {
56 { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3070_PRODUCT_ID) },
57 { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3075_PRODUCT_ID) },
58 { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX303_PRODUCT_ID) },
59 { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX353_PRODUCT_ID) },
60 { } /* Terminating entry */
61 };
62
63 MODULE_DEVICE_TABLE(usb, gigaset_table);
64
65 /*======================= local function prototypes ==========================*/
66
67 /* function called if a new device belonging to this driver is connected */
68 static int gigaset_probe(struct usb_interface *interface,
69 const struct usb_device_id *id);
70
71 /* Function will be called if the device is unplugged */
72 static void gigaset_disconnect(struct usb_interface *interface);
73
74 /* functions called before/after suspend */
75 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
76 static int gigaset_resume(struct usb_interface *intf);
77
78 /* functions called before/after device reset */
79 static int gigaset_pre_reset(struct usb_interface *intf);
80 static int gigaset_post_reset(struct usb_interface *intf);
81
82 static int atread_submit(struct cardstate *, int);
83 static void stopurbs(struct bas_bc_state *);
84 static int req_submit(struct bc_state *, int, int, int);
85 static int atwrite_submit(struct cardstate *, unsigned char *, int);
86 static int start_cbsend(struct cardstate *);
87
88 /*============================================================================*/
89
90 struct bas_cardstate {
91 struct usb_device *udev; /* USB device pointer */
92 struct cardstate *cs;
93 struct usb_interface *interface; /* interface for this device */
94 unsigned char minor; /* starting minor number */
95
96 struct urb *urb_ctrl; /* control pipe default URB */
97 struct usb_ctrlrequest dr_ctrl;
98 struct timer_list timer_ctrl; /* control request timeout */
99 int retry_ctrl;
100
101 struct timer_list timer_atrdy; /* AT command ready timeout */
102 struct urb *urb_cmd_out; /* for sending AT commands */
103 struct usb_ctrlrequest dr_cmd_out;
104 int retry_cmd_out;
105
106 struct urb *urb_cmd_in; /* for receiving AT replies */
107 struct usb_ctrlrequest dr_cmd_in;
108 struct timer_list timer_cmd_in; /* receive request timeout */
109 unsigned char *rcvbuf; /* AT reply receive buffer */
110
111 struct urb *urb_int_in; /* URB for interrupt pipe */
112 unsigned char *int_in_buf;
113 struct work_struct int_in_wq; /* for usb_clear_halt() */
114 struct timer_list timer_int_in; /* int read retry delay */
115 int retry_int_in;
116
117 spinlock_t lock; /* locks all following */
118 int basstate; /* bitmap (BS_*) */
119 int pending; /* uncompleted base request */
120 wait_queue_head_t waitqueue;
121 int rcvbuf_size; /* size of AT receive buffer */
122 /* 0: no receive in progress */
123 int retry_cmd_in; /* receive req retry count */
124 };
125
126 /* status of direct USB connection to 307x base (bits in basstate) */
127 #define BS_ATOPEN 0x001 /* AT channel open */
128 #define BS_B1OPEN 0x002 /* B channel 1 open */
129 #define BS_B2OPEN 0x004 /* B channel 2 open */
130 #define BS_ATREADY 0x008 /* base ready for AT command */
131 #define BS_INIT 0x010 /* base has signalled INIT_OK */
132 #define BS_ATTIMER 0x020 /* waiting for HD_READY_SEND_ATDATA */
133 #define BS_ATRDPEND 0x040 /* urb_cmd_in in use */
134 #define BS_ATWRPEND 0x080 /* urb_cmd_out in use */
135 #define BS_SUSPEND 0x100 /* USB port suspended */
136 #define BS_RESETTING 0x200 /* waiting for HD_RESET_INTERRUPT_PIPE_ACK */
137
138
139 static struct gigaset_driver *driver;
140
141 /* usb specific object needed to register this driver with the usb subsystem */
142 static struct usb_driver gigaset_usb_driver = {
143 .name = GIGASET_MODULENAME,
144 .probe = gigaset_probe,
145 .disconnect = gigaset_disconnect,
146 .id_table = gigaset_table,
147 .suspend = gigaset_suspend,
148 .resume = gigaset_resume,
149 .reset_resume = gigaset_post_reset,
150 .pre_reset = gigaset_pre_reset,
151 .post_reset = gigaset_post_reset,
152 .disable_hub_initiated_lpm = 1,
153 };
154
155 /* get message text for usb_submit_urb return code
156 */
157 static char *get_usb_rcmsg(int rc)
158 {
159 static char unkmsg[28];
160
161 switch (rc) {
162 case 0:
163 return "success";
164 case -ENOMEM:
165 return "out of memory";
166 case -ENODEV:
167 return "device not present";
168 case -ENOENT:
169 return "endpoint not present";
170 case -ENXIO:
171 return "URB type not supported";
172 case -EINVAL:
173 return "invalid argument";
174 case -EAGAIN:
175 return "start frame too early or too much scheduled";
176 case -EFBIG:
177 return "too many isoc frames requested";
178 case -EPIPE:
179 return "endpoint stalled";
180 case -EMSGSIZE:
181 return "invalid packet size";
182 case -ENOSPC:
183 return "would overcommit USB bandwidth";
184 case -ESHUTDOWN:
185 return "device shut down";
186 case -EPERM:
187 return "reject flag set";
188 case -EHOSTUNREACH:
189 return "device suspended";
190 default:
191 snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
192 return unkmsg;
193 }
194 }
195
196 /* get message text for USB status code
197 */
198 static char *get_usb_statmsg(int status)
199 {
200 static char unkmsg[28];
201
202 switch (status) {
203 case 0:
204 return "success";
205 case -ENOENT:
206 return "unlinked (sync)";
207 case -EINPROGRESS:
208 return "URB still pending";
209 case -EPROTO:
210 return "bitstuff error, timeout, or unknown USB error";
211 case -EILSEQ:
212 return "CRC mismatch, timeout, or unknown USB error";
213 case -ETIME:
214 return "USB response timeout";
215 case -EPIPE:
216 return "endpoint stalled";
217 case -ECOMM:
218 return "IN buffer overrun";
219 case -ENOSR:
220 return "OUT buffer underrun";
221 case -EOVERFLOW:
222 return "endpoint babble";
223 case -EREMOTEIO:
224 return "short packet";
225 case -ENODEV:
226 return "device removed";
227 case -EXDEV:
228 return "partial isoc transfer";
229 case -EINVAL:
230 return "ISO madness";
231 case -ECONNRESET:
232 return "unlinked (async)";
233 case -ESHUTDOWN:
234 return "device shut down";
235 default:
236 snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
237 return unkmsg;
238 }
239 }
240
241 /* usb_pipetype_str
242 * retrieve string representation of USB pipe type
243 */
244 static inline char *usb_pipetype_str(int pipe)
245 {
246 if (usb_pipeisoc(pipe))
247 return "Isoc";
248 if (usb_pipeint(pipe))
249 return "Int";
250 if (usb_pipecontrol(pipe))
251 return "Ctrl";
252 if (usb_pipebulk(pipe))
253 return "Bulk";
254 return "?";
255 }
256
257 /* dump_urb
258 * write content of URB to syslog for debugging
259 */
260 static inline void dump_urb(enum debuglevel level, const char *tag,
261 struct urb *urb)
262 {
263 #ifdef CONFIG_GIGASET_DEBUG
264 int i;
265 gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
266 if (urb) {
267 gig_dbg(level,
268 " dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
269 "hcpriv=0x%08lx, transfer_flags=0x%x,",
270 (unsigned long) urb->dev,
271 usb_pipetype_str(urb->pipe),
272 usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
273 usb_pipein(urb->pipe) ? "in" : "out",
274 (unsigned long) urb->hcpriv,
275 urb->transfer_flags);
276 gig_dbg(level,
277 " transfer_buffer=0x%08lx[%d], actual_length=%d, "
278 "setup_packet=0x%08lx,",
279 (unsigned long) urb->transfer_buffer,
280 urb->transfer_buffer_length, urb->actual_length,
281 (unsigned long) urb->setup_packet);
282 gig_dbg(level,
283 " start_frame=%d, number_of_packets=%d, interval=%d, "
284 "error_count=%d,",
285 urb->start_frame, urb->number_of_packets, urb->interval,
286 urb->error_count);
287 gig_dbg(level,
288 " context=0x%08lx, complete=0x%08lx, "
289 "iso_frame_desc[]={",
290 (unsigned long) urb->context,
291 (unsigned long) urb->complete);
292 for (i = 0; i < urb->number_of_packets; i++) {
293 struct usb_iso_packet_descriptor *pifd
294 = &urb->iso_frame_desc[i];
295 gig_dbg(level,
296 " {offset=%u, length=%u, actual_length=%u, "
297 "status=%u}",
298 pifd->offset, pifd->length, pifd->actual_length,
299 pifd->status);
300 }
301 }
302 gig_dbg(level, "}}");
303 #endif
304 }
305
306 /* read/set modem control bits etc. (m10x only) */
307 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
308 unsigned new_state)
309 {
310 return -EINVAL;
311 }
312
313 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
314 {
315 return -EINVAL;
316 }
317
318 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
319 {
320 return -EINVAL;
321 }
322
323 /* set/clear bits in base connection state, return previous state
324 */
325 static inline int update_basstate(struct bas_cardstate *ucs,
326 int set, int clear)
327 {
328 unsigned long flags;
329 int state;
330
331 spin_lock_irqsave(&ucs->lock, flags);
332 state = ucs->basstate;
333 ucs->basstate = (state & ~clear) | set;
334 spin_unlock_irqrestore(&ucs->lock, flags);
335 return state;
336 }
337
338 /* error_hangup
339 * hang up any existing connection because of an unrecoverable error
340 * This function may be called from any context and takes care of scheduling
341 * the necessary actions for execution outside of interrupt context.
342 * cs->lock must not be held.
343 * argument:
344 * B channel control structure
345 */
346 static inline void error_hangup(struct bc_state *bcs)
347 {
348 struct cardstate *cs = bcs->cs;
349
350 gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL);
351 gigaset_schedule_event(cs);
352 }
353
354 /* error_reset
355 * reset Gigaset device because of an unrecoverable error
356 * This function may be called from any context, and takes care of
357 * scheduling the necessary actions for execution outside of interrupt context.
358 * cs->hw.bas->lock must not be held.
359 * argument:
360 * controller state structure
361 */
362 static inline void error_reset(struct cardstate *cs)
363 {
364 /* reset interrupt pipe to recover (ignore errors) */
365 update_basstate(cs->hw.bas, BS_RESETTING, 0);
366 if (req_submit(cs->bcs, HD_RESET_INTERRUPT_PIPE, 0, BAS_TIMEOUT))
367 /* submission failed, escalate to USB port reset */
368 usb_queue_reset_device(cs->hw.bas->interface);
369 }
370
371 /* check_pending
372 * check for completion of pending control request
373 * parameter:
374 * ucs hardware specific controller state structure
375 */
376 static void check_pending(struct bas_cardstate *ucs)
377 {
378 unsigned long flags;
379
380 spin_lock_irqsave(&ucs->lock, flags);
381 switch (ucs->pending) {
382 case 0:
383 break;
384 case HD_OPEN_ATCHANNEL:
385 if (ucs->basstate & BS_ATOPEN)
386 ucs->pending = 0;
387 break;
388 case HD_OPEN_B1CHANNEL:
389 if (ucs->basstate & BS_B1OPEN)
390 ucs->pending = 0;
391 break;
392 case HD_OPEN_B2CHANNEL:
393 if (ucs->basstate & BS_B2OPEN)
394 ucs->pending = 0;
395 break;
396 case HD_CLOSE_ATCHANNEL:
397 if (!(ucs->basstate & BS_ATOPEN))
398 ucs->pending = 0;
399 break;
400 case HD_CLOSE_B1CHANNEL:
401 if (!(ucs->basstate & BS_B1OPEN))
402 ucs->pending = 0;
403 break;
404 case HD_CLOSE_B2CHANNEL:
405 if (!(ucs->basstate & BS_B2OPEN))
406 ucs->pending = 0;
407 break;
408 case HD_DEVICE_INIT_ACK: /* no reply expected */
409 ucs->pending = 0;
410 break;
411 case HD_RESET_INTERRUPT_PIPE:
412 if (!(ucs->basstate & BS_RESETTING))
413 ucs->pending = 0;
414 break;
415 /*
416 * HD_READ_ATMESSAGE and HD_WRITE_ATMESSAGE are handled separately
417 * and should never end up here
418 */
419 default:
420 dev_warn(&ucs->interface->dev,
421 "unknown pending request 0x%02x cleared\n",
422 ucs->pending);
423 ucs->pending = 0;
424 }
425
426 if (!ucs->pending)
427 del_timer(&ucs->timer_ctrl);
428
429 spin_unlock_irqrestore(&ucs->lock, flags);
430 }
431
432 /* cmd_in_timeout
433 * timeout routine for command input request
434 * argument:
435 * controller state structure
436 */
437 static void cmd_in_timeout(struct timer_list *t)
438 {
439 struct bas_cardstate *ucs = from_timer(ucs, t, timer_cmd_in);
440 struct cardstate *cs = ucs->cs;
441 int rc;
442
443 if (!ucs->rcvbuf_size) {
444 gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
445 return;
446 }
447
448 if (ucs->retry_cmd_in++ >= BAS_RETRY) {
449 dev_err(cs->dev,
450 "control read: timeout, giving up after %d tries\n",
451 ucs->retry_cmd_in);
452 kfree(ucs->rcvbuf);
453 ucs->rcvbuf = NULL;
454 ucs->rcvbuf_size = 0;
455 error_reset(cs);
456 return;
457 }
458
459 gig_dbg(DEBUG_USBREQ, "%s: timeout, retry %d",
460 __func__, ucs->retry_cmd_in);
461 rc = atread_submit(cs, BAS_TIMEOUT);
462 if (rc < 0) {
463 kfree(ucs->rcvbuf);
464 ucs->rcvbuf = NULL;
465 ucs->rcvbuf_size = 0;
466 if (rc != -ENODEV)
467 error_reset(cs);
468 }
469 }
470
471 /* read_ctrl_callback
472 * USB completion handler for control pipe input
473 * called by the USB subsystem in interrupt context
474 * parameter:
475 * urb USB request block
476 * urb->context = inbuf structure for controller state
477 */
478 static void read_ctrl_callback(struct urb *urb)
479 {
480 struct inbuf_t *inbuf = urb->context;
481 struct cardstate *cs = inbuf->cs;
482 struct bas_cardstate *ucs = cs->hw.bas;
483 int status = urb->status;
484 unsigned numbytes;
485 int rc;
486
487 update_basstate(ucs, 0, BS_ATRDPEND);
488 wake_up(&ucs->waitqueue);
489 del_timer(&ucs->timer_cmd_in);
490
491 switch (status) {
492 case 0: /* normal completion */
493 numbytes = urb->actual_length;
494 if (unlikely(numbytes != ucs->rcvbuf_size)) {
495 dev_warn(cs->dev,
496 "control read: received %d chars, expected %d\n",
497 numbytes, ucs->rcvbuf_size);
498 if (numbytes > ucs->rcvbuf_size)
499 numbytes = ucs->rcvbuf_size;
500 }
501
502 /* copy received bytes to inbuf, notify event layer */
503 if (gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes)) {
504 gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
505 gigaset_schedule_event(cs);
506 }
507 break;
508
509 case -ENOENT: /* cancelled */
510 case -ECONNRESET: /* cancelled (async) */
511 case -EINPROGRESS: /* pending */
512 case -ENODEV: /* device removed */
513 case -ESHUTDOWN: /* device shut down */
514 /* no further action necessary */
515 gig_dbg(DEBUG_USBREQ, "%s: %s",
516 __func__, get_usb_statmsg(status));
517 break;
518
519 default: /* other errors: retry */
520 if (ucs->retry_cmd_in++ < BAS_RETRY) {
521 gig_dbg(DEBUG_USBREQ, "%s: %s, retry %d", __func__,
522 get_usb_statmsg(status), ucs->retry_cmd_in);
523 rc = atread_submit(cs, BAS_TIMEOUT);
524 if (rc >= 0)
525 /* successfully resubmitted, skip freeing */
526 return;
527 if (rc == -ENODEV)
528 /* disconnect, no further action necessary */
529 break;
530 }
531 dev_err(cs->dev, "control read: %s, giving up after %d tries\n",
532 get_usb_statmsg(status), ucs->retry_cmd_in);
533 error_reset(cs);
534 }
535
536 /* read finished, free buffer */
537 kfree(ucs->rcvbuf);
538 ucs->rcvbuf = NULL;
539 ucs->rcvbuf_size = 0;
540 }
541
542 /* atread_submit
543 * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
544 * parameters:
545 * cs controller state structure
546 * timeout timeout in 1/10 sec., 0: none
547 * return value:
548 * 0 on success
549 * -EBUSY if another request is pending
550 * any URB submission error code
551 */
552 static int atread_submit(struct cardstate *cs, int timeout)
553 {
554 struct bas_cardstate *ucs = cs->hw.bas;
555 int basstate;
556 int ret;
557
558 gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
559 ucs->rcvbuf_size);
560
561 basstate = update_basstate(ucs, BS_ATRDPEND, 0);
562 if (basstate & BS_ATRDPEND) {
563 dev_err(cs->dev,
564 "could not submit HD_READ_ATMESSAGE: URB busy\n");
565 return -EBUSY;
566 }
567
568 if (basstate & BS_SUSPEND) {
569 dev_notice(cs->dev,
570 "HD_READ_ATMESSAGE not submitted, "
571 "suspend in progress\n");
572 update_basstate(ucs, 0, BS_ATRDPEND);
573 /* treat like disconnect */
574 return -ENODEV;
575 }
576
577 ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
578 ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
579 ucs->dr_cmd_in.wValue = 0;
580 ucs->dr_cmd_in.wIndex = 0;
581 ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
582 usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
583 usb_rcvctrlpipe(ucs->udev, 0),
584 (unsigned char *) &ucs->dr_cmd_in,
585 ucs->rcvbuf, ucs->rcvbuf_size,
586 read_ctrl_callback, cs->inbuf);
587
588 ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC);
589 if (ret != 0) {
590 update_basstate(ucs, 0, BS_ATRDPEND);
591 dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
592 get_usb_rcmsg(ret));
593 return ret;
594 }
595
596 if (timeout > 0) {
597 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
598 mod_timer(&ucs->timer_cmd_in, jiffies + timeout * HZ / 10);
599 }
600 return 0;
601 }
602
603 /* int_in_work
604 * workqueue routine to clear halt on interrupt in endpoint
605 */
606
607 static void int_in_work(struct work_struct *work)
608 {
609 struct bas_cardstate *ucs =
610 container_of(work, struct bas_cardstate, int_in_wq);
611 struct urb *urb = ucs->urb_int_in;
612 struct cardstate *cs = urb->context;
613 int rc;
614
615 /* clear halt condition */
616 rc = usb_clear_halt(ucs->udev, urb->pipe);
617 gig_dbg(DEBUG_USBREQ, "clear_halt: %s", get_usb_rcmsg(rc));
618 if (rc == 0)
619 /* success, resubmit interrupt read URB */
620 rc = usb_submit_urb(urb, GFP_ATOMIC);
621
622 switch (rc) {
623 case 0: /* success */
624 case -ENODEV: /* device gone */
625 case -EINVAL: /* URB already resubmitted, or terminal badness */
626 break;
627 default: /* failure: try to recover by resetting the device */
628 dev_err(cs->dev, "clear halt failed: %s\n", get_usb_rcmsg(rc));
629 rc = usb_lock_device_for_reset(ucs->udev, ucs->interface);
630 if (rc == 0) {
631 rc = usb_reset_device(ucs->udev);
632 usb_unlock_device(ucs->udev);
633 }
634 }
635 ucs->retry_int_in = 0;
636 }
637
638 /* int_in_resubmit
639 * timer routine for interrupt read delayed resubmit
640 * argument:
641 * controller state structure
642 */
643 static void int_in_resubmit(struct timer_list *t)
644 {
645 struct bas_cardstate *ucs = from_timer(ucs, t, timer_int_in);
646 struct cardstate *cs = ucs->cs;
647 int rc;
648
649 if (ucs->retry_int_in++ >= BAS_RETRY) {
650 dev_err(cs->dev, "interrupt read: giving up after %d tries\n",
651 ucs->retry_int_in);
652 usb_queue_reset_device(ucs->interface);
653 return;
654 }
655
656 gig_dbg(DEBUG_USBREQ, "%s: retry %d", __func__, ucs->retry_int_in);
657 rc = usb_submit_urb(ucs->urb_int_in, GFP_ATOMIC);
658 if (rc != 0 && rc != -ENODEV) {
659 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
660 get_usb_rcmsg(rc));
661 usb_queue_reset_device(ucs->interface);
662 }
663 }
664
665 /* read_int_callback
666 * USB completion handler for interrupt pipe input
667 * called by the USB subsystem in interrupt context
668 * parameter:
669 * urb USB request block
670 * urb->context = controller state structure
671 */
672 static void read_int_callback(struct urb *urb)
673 {
674 struct cardstate *cs = urb->context;
675 struct bas_cardstate *ucs = cs->hw.bas;
676 struct bc_state *bcs;
677 int status = urb->status;
678 unsigned long flags;
679 int rc;
680 unsigned l;
681 int channel;
682
683 switch (status) {
684 case 0: /* success */
685 ucs->retry_int_in = 0;
686 break;
687 case -EPIPE: /* endpoint stalled */
688 schedule_work(&ucs->int_in_wq);
689 /* fall through */
690 case -ENOENT: /* cancelled */
691 case -ECONNRESET: /* cancelled (async) */
692 case -EINPROGRESS: /* pending */
693 case -ENODEV: /* device removed */
694 case -ESHUTDOWN: /* device shut down */
695 /* no further action necessary */
696 gig_dbg(DEBUG_USBREQ, "%s: %s",
697 __func__, get_usb_statmsg(status));
698 return;
699 case -EPROTO: /* protocol error or unplug */
700 case -EILSEQ:
701 case -ETIME:
702 /* resubmit after delay */
703 gig_dbg(DEBUG_USBREQ, "%s: %s",
704 __func__, get_usb_statmsg(status));
705 mod_timer(&ucs->timer_int_in, jiffies + HZ / 10);
706 return;
707 default: /* other errors: just resubmit */
708 dev_warn(cs->dev, "interrupt read: %s\n",
709 get_usb_statmsg(status));
710 goto resubmit;
711 }
712
713 /* drop incomplete packets even if the missing bytes wouldn't matter */
714 if (unlikely(urb->actual_length < IP_MSGSIZE)) {
715 dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
716 urb->actual_length);
717 goto resubmit;
718 }
719
720 l = (unsigned) ucs->int_in_buf[1] +
721 (((unsigned) ucs->int_in_buf[2]) << 8);
722
723 gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
724 urb->actual_length, (int)ucs->int_in_buf[0], l,
725 (int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
726
727 channel = 0;
728
729 switch (ucs->int_in_buf[0]) {
730 case HD_DEVICE_INIT_OK:
731 update_basstate(ucs, BS_INIT, 0);
732 break;
733
734 case HD_READY_SEND_ATDATA:
735 del_timer(&ucs->timer_atrdy);
736 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
737 start_cbsend(cs);
738 break;
739
740 case HD_OPEN_B2CHANNEL_ACK:
741 ++channel;
742 case HD_OPEN_B1CHANNEL_ACK:
743 bcs = cs->bcs + channel;
744 update_basstate(ucs, BS_B1OPEN << channel, 0);
745 gigaset_bchannel_up(bcs);
746 break;
747
748 case HD_OPEN_ATCHANNEL_ACK:
749 update_basstate(ucs, BS_ATOPEN, 0);
750 start_cbsend(cs);
751 break;
752
753 case HD_CLOSE_B2CHANNEL_ACK:
754 ++channel;
755 case HD_CLOSE_B1CHANNEL_ACK:
756 bcs = cs->bcs + channel;
757 update_basstate(ucs, 0, BS_B1OPEN << channel);
758 stopurbs(bcs->hw.bas);
759 gigaset_bchannel_down(bcs);
760 break;
761
762 case HD_CLOSE_ATCHANNEL_ACK:
763 update_basstate(ucs, 0, BS_ATOPEN);
764 break;
765
766 case HD_B2_FLOW_CONTROL:
767 ++channel;
768 case HD_B1_FLOW_CONTROL:
769 bcs = cs->bcs + channel;
770 atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
771 &bcs->hw.bas->corrbytes);
772 gig_dbg(DEBUG_ISO,
773 "Flow control (channel %d, sub %d): 0x%02x => %d",
774 channel, bcs->hw.bas->numsub, l,
775 atomic_read(&bcs->hw.bas->corrbytes));
776 break;
777
778 case HD_RECEIVEATDATA_ACK: /* AT response ready to be received */
779 if (!l) {
780 dev_warn(cs->dev,
781 "HD_RECEIVEATDATA_ACK with length 0 ignored\n");
782 break;
783 }
784 spin_lock_irqsave(&cs->lock, flags);
785 if (ucs->basstate & BS_ATRDPEND) {
786 spin_unlock_irqrestore(&cs->lock, flags);
787 dev_warn(cs->dev,
788 "HD_RECEIVEATDATA_ACK(%d) during HD_READ_ATMESSAGE(%d) ignored\n",
789 l, ucs->rcvbuf_size);
790 break;
791 }
792 if (ucs->rcvbuf_size) {
793 /* throw away previous buffer - we have no queue */
794 dev_err(cs->dev,
795 "receive AT data overrun, %d bytes lost\n",
796 ucs->rcvbuf_size);
797 kfree(ucs->rcvbuf);
798 ucs->rcvbuf_size = 0;
799 }
800 ucs->rcvbuf = kmalloc(l, GFP_ATOMIC);
801 if (ucs->rcvbuf == NULL) {
802 spin_unlock_irqrestore(&cs->lock, flags);
803 dev_err(cs->dev, "out of memory receiving AT data\n");
804 break;
805 }
806 ucs->rcvbuf_size = l;
807 ucs->retry_cmd_in = 0;
808 rc = atread_submit(cs, BAS_TIMEOUT);
809 if (rc < 0) {
810 kfree(ucs->rcvbuf);
811 ucs->rcvbuf = NULL;
812 ucs->rcvbuf_size = 0;
813 }
814 spin_unlock_irqrestore(&cs->lock, flags);
815 if (rc < 0 && rc != -ENODEV)
816 error_reset(cs);
817 break;
818
819 case HD_RESET_INTERRUPT_PIPE_ACK:
820 update_basstate(ucs, 0, BS_RESETTING);
821 dev_notice(cs->dev, "interrupt pipe reset\n");
822 break;
823
824 case HD_SUSPEND_END:
825 gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
826 break;
827
828 default:
829 dev_warn(cs->dev,
830 "unknown Gigaset signal 0x%02x (%u) ignored\n",
831 (int) ucs->int_in_buf[0], l);
832 }
833
834 check_pending(ucs);
835 wake_up(&ucs->waitqueue);
836
837 resubmit:
838 rc = usb_submit_urb(urb, GFP_ATOMIC);
839 if (unlikely(rc != 0 && rc != -ENODEV)) {
840 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
841 get_usb_rcmsg(rc));
842 error_reset(cs);
843 }
844 }
845
846 /* read_iso_callback
847 * USB completion handler for B channel isochronous input
848 * called by the USB subsystem in interrupt context
849 * parameter:
850 * urb USB request block of completed request
851 * urb->context = bc_state structure
852 */
853 static void read_iso_callback(struct urb *urb)
854 {
855 struct bc_state *bcs;
856 struct bas_bc_state *ubc;
857 int status = urb->status;
858 unsigned long flags;
859 int i, rc;
860
861 /* status codes not worth bothering the tasklet with */
862 if (unlikely(status == -ENOENT ||
863 status == -ECONNRESET ||
864 status == -EINPROGRESS ||
865 status == -ENODEV ||
866 status == -ESHUTDOWN)) {
867 gig_dbg(DEBUG_ISO, "%s: %s",
868 __func__, get_usb_statmsg(status));
869 return;
870 }
871
872 bcs = urb->context;
873 ubc = bcs->hw.bas;
874
875 spin_lock_irqsave(&ubc->isoinlock, flags);
876 if (likely(ubc->isoindone == NULL)) {
877 /* pass URB to tasklet */
878 ubc->isoindone = urb;
879 ubc->isoinstatus = status;
880 tasklet_hi_schedule(&ubc->rcvd_tasklet);
881 } else {
882 /* tasklet still busy, drop data and resubmit URB */
883 gig_dbg(DEBUG_ISO, "%s: overrun", __func__);
884 ubc->loststatus = status;
885 for (i = 0; i < BAS_NUMFRAMES; i++) {
886 ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
887 if (unlikely(urb->iso_frame_desc[i].status != 0 &&
888 urb->iso_frame_desc[i].status != -EINPROGRESS))
889 ubc->loststatus = urb->iso_frame_desc[i].status;
890 urb->iso_frame_desc[i].status = 0;
891 urb->iso_frame_desc[i].actual_length = 0;
892 }
893 if (likely(ubc->running)) {
894 /* urb->dev is clobbered by USB subsystem */
895 urb->dev = bcs->cs->hw.bas->udev;
896 urb->transfer_flags = URB_ISO_ASAP;
897 urb->number_of_packets = BAS_NUMFRAMES;
898 rc = usb_submit_urb(urb, GFP_ATOMIC);
899 if (unlikely(rc != 0 && rc != -ENODEV)) {
900 dev_err(bcs->cs->dev,
901 "could not resubmit isoc read URB: %s\n",
902 get_usb_rcmsg(rc));
903 dump_urb(DEBUG_ISO, "isoc read", urb);
904 error_hangup(bcs);
905 }
906 }
907 }
908 spin_unlock_irqrestore(&ubc->isoinlock, flags);
909 }
910
911 /* write_iso_callback
912 * USB completion handler for B channel isochronous output
913 * called by the USB subsystem in interrupt context
914 * parameter:
915 * urb USB request block of completed request
916 * urb->context = isow_urbctx_t structure
917 */
918 static void write_iso_callback(struct urb *urb)
919 {
920 struct isow_urbctx_t *ucx;
921 struct bas_bc_state *ubc;
922 int status = urb->status;
923 unsigned long flags;
924
925 /* status codes not worth bothering the tasklet with */
926 if (unlikely(status == -ENOENT ||
927 status == -ECONNRESET ||
928 status == -EINPROGRESS ||
929 status == -ENODEV ||
930 status == -ESHUTDOWN)) {
931 gig_dbg(DEBUG_ISO, "%s: %s",
932 __func__, get_usb_statmsg(status));
933 return;
934 }
935
936 /* pass URB context to tasklet */
937 ucx = urb->context;
938 ubc = ucx->bcs->hw.bas;
939 ucx->status = status;
940
941 spin_lock_irqsave(&ubc->isooutlock, flags);
942 ubc->isooutovfl = ubc->isooutdone;
943 ubc->isooutdone = ucx;
944 spin_unlock_irqrestore(&ubc->isooutlock, flags);
945 tasklet_hi_schedule(&ubc->sent_tasklet);
946 }
947
948 /* starturbs
949 * prepare and submit USB request blocks for isochronous input and output
950 * argument:
951 * B channel control structure
952 * return value:
953 * 0 on success
954 * < 0 on error (no URBs submitted)
955 */
956 static int starturbs(struct bc_state *bcs)
957 {
958 struct bas_bc_state *ubc = bcs->hw.bas;
959 struct urb *urb;
960 int j, k;
961 int rc;
962
963 /* initialize L2 reception */
964 if (bcs->proto2 == L2_HDLC)
965 bcs->inputstate |= INS_flag_hunt;
966
967 /* submit all isochronous input URBs */
968 ubc->running = 1;
969 for (k = 0; k < BAS_INURBS; k++) {
970 urb = ubc->isoinurbs[k];
971 if (!urb) {
972 rc = -EFAULT;
973 goto error;
974 }
975
976 urb->dev = bcs->cs->hw.bas->udev;
977 urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
978 urb->transfer_flags = URB_ISO_ASAP;
979 urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
980 urb->transfer_buffer_length = BAS_INBUFSIZE;
981 urb->number_of_packets = BAS_NUMFRAMES;
982 urb->interval = BAS_FRAMETIME;
983 urb->complete = read_iso_callback;
984 urb->context = bcs;
985 for (j = 0; j < BAS_NUMFRAMES; j++) {
986 urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
987 urb->iso_frame_desc[j].length = BAS_MAXFRAME;
988 urb->iso_frame_desc[j].status = 0;
989 urb->iso_frame_desc[j].actual_length = 0;
990 }
991
992 dump_urb(DEBUG_ISO, "Initial isoc read", urb);
993 rc = usb_submit_urb(urb, GFP_ATOMIC);
994 if (rc != 0)
995 goto error;
996 }
997
998 /* initialize L2 transmission */
999 gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
1000
1001 /* set up isochronous output URBs for flag idling */
1002 for (k = 0; k < BAS_OUTURBS; ++k) {
1003 urb = ubc->isoouturbs[k].urb;
1004 if (!urb) {
1005 rc = -EFAULT;
1006 goto error;
1007 }
1008 urb->dev = bcs->cs->hw.bas->udev;
1009 urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
1010 urb->transfer_flags = URB_ISO_ASAP;
1011 urb->transfer_buffer = ubc->isooutbuf->data;
1012 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1013 urb->number_of_packets = BAS_NUMFRAMES;
1014 urb->interval = BAS_FRAMETIME;
1015 urb->complete = write_iso_callback;
1016 urb->context = &ubc->isoouturbs[k];
1017 for (j = 0; j < BAS_NUMFRAMES; ++j) {
1018 urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
1019 urb->iso_frame_desc[j].length = BAS_NORMFRAME;
1020 urb->iso_frame_desc[j].status = 0;
1021 urb->iso_frame_desc[j].actual_length = 0;
1022 }
1023 ubc->isoouturbs[k].limit = -1;
1024 }
1025
1026 /* keep one URB free, submit the others */
1027 for (k = 0; k < BAS_OUTURBS - 1; ++k) {
1028 dump_urb(DEBUG_ISO, "Initial isoc write", urb);
1029 rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
1030 if (rc != 0)
1031 goto error;
1032 }
1033 dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
1034 ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS - 1];
1035 ubc->isooutdone = ubc->isooutovfl = NULL;
1036 return 0;
1037 error:
1038 stopurbs(ubc);
1039 return rc;
1040 }
1041
1042 /* stopurbs
1043 * cancel the USB request blocks for isochronous input and output
1044 * errors are silently ignored
1045 * argument:
1046 * B channel control structure
1047 */
1048 static void stopurbs(struct bas_bc_state *ubc)
1049 {
1050 int k, rc;
1051
1052 ubc->running = 0;
1053
1054 for (k = 0; k < BAS_INURBS; ++k) {
1055 rc = usb_unlink_urb(ubc->isoinurbs[k]);
1056 gig_dbg(DEBUG_ISO,
1057 "%s: isoc input URB %d unlinked, result = %s",
1058 __func__, k, get_usb_rcmsg(rc));
1059 }
1060
1061 for (k = 0; k < BAS_OUTURBS; ++k) {
1062 rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
1063 gig_dbg(DEBUG_ISO,
1064 "%s: isoc output URB %d unlinked, result = %s",
1065 __func__, k, get_usb_rcmsg(rc));
1066 }
1067 }
1068
1069 /* Isochronous Write - Bottom Half */
1070 /* =============================== */
1071
1072 /* submit_iso_write_urb
1073 * fill and submit the next isochronous write URB
1074 * parameters:
1075 * ucx context structure containing URB
1076 * return value:
1077 * number of frames submitted in URB
1078 * 0 if URB not submitted because no data available (isooutbuf busy)
1079 * error code < 0 on error
1080 */
1081 static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
1082 {
1083 struct urb *urb = ucx->urb;
1084 struct bas_bc_state *ubc = ucx->bcs->hw.bas;
1085 struct usb_iso_packet_descriptor *ifd;
1086 int corrbytes, nframe, rc;
1087
1088 /* urb->dev is clobbered by USB subsystem */
1089 urb->dev = ucx->bcs->cs->hw.bas->udev;
1090 urb->transfer_flags = URB_ISO_ASAP;
1091 urb->transfer_buffer = ubc->isooutbuf->data;
1092 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1093
1094 for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
1095 ifd = &urb->iso_frame_desc[nframe];
1096
1097 /* compute frame length according to flow control */
1098 ifd->length = BAS_NORMFRAME;
1099 corrbytes = atomic_read(&ubc->corrbytes);
1100 if (corrbytes != 0) {
1101 gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
1102 __func__, corrbytes);
1103 if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
1104 corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
1105 else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
1106 corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
1107 ifd->length += corrbytes;
1108 atomic_add(-corrbytes, &ubc->corrbytes);
1109 }
1110
1111 /* retrieve block of data to send */
1112 rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
1113 if (rc < 0) {
1114 if (rc == -EBUSY) {
1115 gig_dbg(DEBUG_ISO,
1116 "%s: buffer busy at frame %d",
1117 __func__, nframe);
1118 /* tasklet will be restarted from
1119 gigaset_isoc_send_skb() */
1120 } else {
1121 dev_err(ucx->bcs->cs->dev,
1122 "%s: buffer error %d at frame %d\n",
1123 __func__, rc, nframe);
1124 return rc;
1125 }
1126 break;
1127 }
1128 ifd->offset = rc;
1129 ucx->limit = ubc->isooutbuf->nextread;
1130 ifd->status = 0;
1131 ifd->actual_length = 0;
1132 }
1133 if (unlikely(nframe == 0))
1134 return 0; /* no data to send */
1135 urb->number_of_packets = nframe;
1136
1137 rc = usb_submit_urb(urb, GFP_ATOMIC);
1138 if (unlikely(rc)) {
1139 if (rc == -ENODEV)
1140 /* device removed - give up silently */
1141 gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
1142 else
1143 dev_err(ucx->bcs->cs->dev,
1144 "could not submit isoc write URB: %s\n",
1145 get_usb_rcmsg(rc));
1146 return rc;
1147 }
1148 ++ubc->numsub;
1149 return nframe;
1150 }
1151
1152 /* write_iso_tasklet
1153 * tasklet scheduled when an isochronous output URB from the Gigaset device
1154 * has completed
1155 * parameter:
1156 * data B channel state structure
1157 */
1158 static void write_iso_tasklet(unsigned long data)
1159 {
1160 struct bc_state *bcs = (struct bc_state *) data;
1161 struct bas_bc_state *ubc = bcs->hw.bas;
1162 struct cardstate *cs = bcs->cs;
1163 struct isow_urbctx_t *done, *next, *ovfl;
1164 struct urb *urb;
1165 int status;
1166 struct usb_iso_packet_descriptor *ifd;
1167 unsigned long flags;
1168 int i;
1169 struct sk_buff *skb;
1170 int len;
1171 int rc;
1172
1173 /* loop while completed URBs arrive in time */
1174 for (;;) {
1175 if (unlikely(!(ubc->running))) {
1176 gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1177 return;
1178 }
1179
1180 /* retrieve completed URBs */
1181 spin_lock_irqsave(&ubc->isooutlock, flags);
1182 done = ubc->isooutdone;
1183 ubc->isooutdone = NULL;
1184 ovfl = ubc->isooutovfl;
1185 ubc->isooutovfl = NULL;
1186 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1187 if (ovfl) {
1188 dev_err(cs->dev, "isoc write underrun\n");
1189 error_hangup(bcs);
1190 break;
1191 }
1192 if (!done)
1193 break;
1194
1195 /* submit free URB if available */
1196 spin_lock_irqsave(&ubc->isooutlock, flags);
1197 next = ubc->isooutfree;
1198 ubc->isooutfree = NULL;
1199 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1200 if (next) {
1201 rc = submit_iso_write_urb(next);
1202 if (unlikely(rc <= 0 && rc != -ENODEV)) {
1203 /* could not submit URB, put it back */
1204 spin_lock_irqsave(&ubc->isooutlock, flags);
1205 if (ubc->isooutfree == NULL) {
1206 ubc->isooutfree = next;
1207 next = NULL;
1208 }
1209 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1210 if (next) {
1211 /* couldn't put it back */
1212 dev_err(cs->dev,
1213 "losing isoc write URB\n");
1214 error_hangup(bcs);
1215 }
1216 }
1217 }
1218
1219 /* process completed URB */
1220 urb = done->urb;
1221 status = done->status;
1222 switch (status) {
1223 case -EXDEV: /* partial completion */
1224 gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1225 __func__);
1226 /* fall through - what's the difference anyway? */
1227 case 0: /* normal completion */
1228 /* inspect individual frames
1229 * assumptions (for lack of documentation):
1230 * - actual_length bytes of first frame in error are
1231 * successfully sent
1232 * - all following frames are not sent at all
1233 */
1234 for (i = 0; i < BAS_NUMFRAMES; i++) {
1235 ifd = &urb->iso_frame_desc[i];
1236 if (ifd->status ||
1237 ifd->actual_length != ifd->length) {
1238 dev_warn(cs->dev,
1239 "isoc write: frame %d[%d/%d]: %s\n",
1240 i, ifd->actual_length,
1241 ifd->length,
1242 get_usb_statmsg(ifd->status));
1243 break;
1244 }
1245 }
1246 break;
1247 case -EPIPE: /* stall - probably underrun */
1248 dev_err(cs->dev, "isoc write: stalled\n");
1249 error_hangup(bcs);
1250 break;
1251 default: /* other errors */
1252 dev_warn(cs->dev, "isoc write: %s\n",
1253 get_usb_statmsg(status));
1254 }
1255
1256 /* mark the write buffer area covered by this URB as free */
1257 if (done->limit >= 0)
1258 ubc->isooutbuf->read = done->limit;
1259
1260 /* mark URB as free */
1261 spin_lock_irqsave(&ubc->isooutlock, flags);
1262 next = ubc->isooutfree;
1263 ubc->isooutfree = done;
1264 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1265 if (next) {
1266 /* only one URB still active - resubmit one */
1267 rc = submit_iso_write_urb(next);
1268 if (unlikely(rc <= 0 && rc != -ENODEV)) {
1269 /* couldn't submit */
1270 error_hangup(bcs);
1271 }
1272 }
1273 }
1274
1275 /* process queued SKBs */
1276 while ((skb = skb_dequeue(&bcs->squeue))) {
1277 /* copy to output buffer, doing L2 encapsulation */
1278 len = skb->len;
1279 if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
1280 /* insufficient buffer space, push back onto queue */
1281 skb_queue_head(&bcs->squeue, skb);
1282 gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
1283 __func__, skb_queue_len(&bcs->squeue));
1284 break;
1285 }
1286 skb_pull(skb, len);
1287 gigaset_skb_sent(bcs, skb);
1288 dev_kfree_skb_any(skb);
1289 }
1290 }
1291
1292 /* Isochronous Read - Bottom Half */
1293 /* ============================== */
1294
1295 /* read_iso_tasklet
1296 * tasklet scheduled when an isochronous input URB from the Gigaset device
1297 * has completed
1298 * parameter:
1299 * data B channel state structure
1300 */
1301 static void read_iso_tasklet(unsigned long data)
1302 {
1303 struct bc_state *bcs = (struct bc_state *) data;
1304 struct bas_bc_state *ubc = bcs->hw.bas;
1305 struct cardstate *cs = bcs->cs;
1306 struct urb *urb;
1307 int status;
1308 struct usb_iso_packet_descriptor *ifd;
1309 char *rcvbuf;
1310 unsigned long flags;
1311 int totleft, numbytes, offset, frame, rc;
1312
1313 /* loop while more completed URBs arrive in the meantime */
1314 for (;;) {
1315 /* retrieve URB */
1316 spin_lock_irqsave(&ubc->isoinlock, flags);
1317 urb = ubc->isoindone;
1318 if (!urb) {
1319 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1320 return;
1321 }
1322 status = ubc->isoinstatus;
1323 ubc->isoindone = NULL;
1324 if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1325 dev_warn(cs->dev,
1326 "isoc read overrun, URB dropped (status: %s, %d bytes)\n",
1327 get_usb_statmsg(ubc->loststatus),
1328 ubc->isoinlost);
1329 ubc->loststatus = -EINPROGRESS;
1330 }
1331 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1332
1333 if (unlikely(!(ubc->running))) {
1334 gig_dbg(DEBUG_ISO,
1335 "%s: channel not running, "
1336 "dropped URB with status: %s",
1337 __func__, get_usb_statmsg(status));
1338 return;
1339 }
1340
1341 switch (status) {
1342 case 0: /* normal completion */
1343 break;
1344 case -EXDEV: /* inspect individual frames
1345 (we do that anyway) */
1346 gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1347 __func__);
1348 break;
1349 case -ENOENT:
1350 case -ECONNRESET:
1351 case -EINPROGRESS:
1352 gig_dbg(DEBUG_ISO, "%s: %s",
1353 __func__, get_usb_statmsg(status));
1354 continue; /* -> skip */
1355 case -EPIPE:
1356 dev_err(cs->dev, "isoc read: stalled\n");
1357 error_hangup(bcs);
1358 continue; /* -> skip */
1359 default: /* other error */
1360 dev_warn(cs->dev, "isoc read: %s\n",
1361 get_usb_statmsg(status));
1362 goto error;
1363 }
1364
1365 rcvbuf = urb->transfer_buffer;
1366 totleft = urb->actual_length;
1367 for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
1368 ifd = &urb->iso_frame_desc[frame];
1369 numbytes = ifd->actual_length;
1370 switch (ifd->status) {
1371 case 0: /* success */
1372 break;
1373 case -EPROTO: /* protocol error or unplug */
1374 case -EILSEQ:
1375 case -ETIME:
1376 /* probably just disconnected, ignore */
1377 gig_dbg(DEBUG_ISO,
1378 "isoc read: frame %d[%d]: %s\n",
1379 frame, numbytes,
1380 get_usb_statmsg(ifd->status));
1381 break;
1382 default: /* other error */
1383 /* report, assume transferred bytes are ok */
1384 dev_warn(cs->dev,
1385 "isoc read: frame %d[%d]: %s\n",
1386 frame, numbytes,
1387 get_usb_statmsg(ifd->status));
1388 }
1389 if (unlikely(numbytes > BAS_MAXFRAME))
1390 dev_warn(cs->dev,
1391 "isoc read: frame %d[%d]: %s\n",
1392 frame, numbytes,
1393 "exceeds max frame size");
1394 if (unlikely(numbytes > totleft)) {
1395 dev_warn(cs->dev,
1396 "isoc read: frame %d[%d]: %s\n",
1397 frame, numbytes,
1398 "exceeds total transfer length");
1399 numbytes = totleft;
1400 }
1401 offset = ifd->offset;
1402 if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1403 dev_warn(cs->dev,
1404 "isoc read: frame %d[%d]: %s\n",
1405 frame, numbytes,
1406 "exceeds end of buffer");
1407 numbytes = BAS_INBUFSIZE - offset;
1408 }
1409 gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
1410 totleft -= numbytes;
1411 }
1412 if (unlikely(totleft > 0))
1413 dev_warn(cs->dev, "isoc read: %d data bytes missing\n",
1414 totleft);
1415
1416 error:
1417 /* URB processed, resubmit */
1418 for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
1419 urb->iso_frame_desc[frame].status = 0;
1420 urb->iso_frame_desc[frame].actual_length = 0;
1421 }
1422 /* urb->dev is clobbered by USB subsystem */
1423 urb->dev = bcs->cs->hw.bas->udev;
1424 urb->transfer_flags = URB_ISO_ASAP;
1425 urb->number_of_packets = BAS_NUMFRAMES;
1426 rc = usb_submit_urb(urb, GFP_ATOMIC);
1427 if (unlikely(rc != 0 && rc != -ENODEV)) {
1428 dev_err(cs->dev,
1429 "could not resubmit isoc read URB: %s\n",
1430 get_usb_rcmsg(rc));
1431 dump_urb(DEBUG_ISO, "resubmit isoc read", urb);
1432 error_hangup(bcs);
1433 }
1434 }
1435 }
1436
1437 /* Channel Operations */
1438 /* ================== */
1439
1440 /* req_timeout
1441 * timeout routine for control output request
1442 * argument:
1443 * controller state structure
1444 */
1445 static void req_timeout(struct timer_list *t)
1446 {
1447 struct bas_cardstate *ucs = from_timer(ucs, t, timer_ctrl);
1448 struct cardstate *cs = ucs->cs;
1449 int pending;
1450 unsigned long flags;
1451
1452 check_pending(ucs);
1453
1454 spin_lock_irqsave(&ucs->lock, flags);
1455 pending = ucs->pending;
1456 ucs->pending = 0;
1457 spin_unlock_irqrestore(&ucs->lock, flags);
1458
1459 switch (pending) {
1460 case 0: /* no pending request */
1461 gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1462 break;
1463
1464 case HD_OPEN_ATCHANNEL:
1465 dev_err(cs->dev, "timeout opening AT channel\n");
1466 error_reset(cs);
1467 break;
1468
1469 case HD_OPEN_B1CHANNEL:
1470 dev_err(cs->dev, "timeout opening channel 1\n");
1471 error_hangup(&cs->bcs[0]);
1472 break;
1473
1474 case HD_OPEN_B2CHANNEL:
1475 dev_err(cs->dev, "timeout opening channel 2\n");
1476 error_hangup(&cs->bcs[1]);
1477 break;
1478
1479 case HD_CLOSE_ATCHANNEL:
1480 dev_err(cs->dev, "timeout closing AT channel\n");
1481 error_reset(cs);
1482 break;
1483
1484 case HD_CLOSE_B1CHANNEL:
1485 dev_err(cs->dev, "timeout closing channel 1\n");
1486 error_reset(cs);
1487 break;
1488
1489 case HD_CLOSE_B2CHANNEL:
1490 dev_err(cs->dev, "timeout closing channel 2\n");
1491 error_reset(cs);
1492 break;
1493
1494 case HD_RESET_INTERRUPT_PIPE:
1495 /* error recovery escalation */
1496 dev_err(cs->dev,
1497 "reset interrupt pipe timeout, attempting USB reset\n");
1498 usb_queue_reset_device(ucs->interface);
1499 break;
1500
1501 default:
1502 dev_warn(cs->dev, "request 0x%02x timed out, clearing\n",
1503 pending);
1504 }
1505
1506 wake_up(&ucs->waitqueue);
1507 }
1508
1509 /* write_ctrl_callback
1510 * USB completion handler for control pipe output
1511 * called by the USB subsystem in interrupt context
1512 * parameter:
1513 * urb USB request block of completed request
1514 * urb->context = hardware specific controller state structure
1515 */
1516 static void write_ctrl_callback(struct urb *urb)
1517 {
1518 struct bas_cardstate *ucs = urb->context;
1519 int status = urb->status;
1520 int rc;
1521 unsigned long flags;
1522
1523 /* check status */
1524 switch (status) {
1525 case 0: /* normal completion */
1526 spin_lock_irqsave(&ucs->lock, flags);
1527 switch (ucs->pending) {
1528 case HD_DEVICE_INIT_ACK: /* no reply expected */
1529 del_timer(&ucs->timer_ctrl);
1530 ucs->pending = 0;
1531 break;
1532 }
1533 spin_unlock_irqrestore(&ucs->lock, flags);
1534 return;
1535
1536 case -ENOENT: /* cancelled */
1537 case -ECONNRESET: /* cancelled (async) */
1538 case -EINPROGRESS: /* pending */
1539 case -ENODEV: /* device removed */
1540 case -ESHUTDOWN: /* device shut down */
1541 /* ignore silently */
1542 gig_dbg(DEBUG_USBREQ, "%s: %s",
1543 __func__, get_usb_statmsg(status));
1544 break;
1545
1546 default: /* any failure */
1547 /* don't retry if suspend requested */
1548 if (++ucs->retry_ctrl > BAS_RETRY ||
1549 (ucs->basstate & BS_SUSPEND)) {
1550 dev_err(&ucs->interface->dev,
1551 "control request 0x%02x failed: %s\n",
1552 ucs->dr_ctrl.bRequest,
1553 get_usb_statmsg(status));
1554 break; /* give up */
1555 }
1556 dev_notice(&ucs->interface->dev,
1557 "control request 0x%02x: %s, retry %d\n",
1558 ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
1559 ucs->retry_ctrl);
1560 /* urb->dev is clobbered by USB subsystem */
1561 urb->dev = ucs->udev;
1562 rc = usb_submit_urb(urb, GFP_ATOMIC);
1563 if (unlikely(rc)) {
1564 dev_err(&ucs->interface->dev,
1565 "could not resubmit request 0x%02x: %s\n",
1566 ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
1567 break;
1568 }
1569 /* resubmitted */
1570 return;
1571 }
1572
1573 /* failed, clear pending request */
1574 spin_lock_irqsave(&ucs->lock, flags);
1575 del_timer(&ucs->timer_ctrl);
1576 ucs->pending = 0;
1577 spin_unlock_irqrestore(&ucs->lock, flags);
1578 wake_up(&ucs->waitqueue);
1579 }
1580
1581 /* req_submit
1582 * submit a control output request without message buffer to the Gigaset base
1583 * and optionally start a timeout
1584 * parameters:
1585 * bcs B channel control structure
1586 * req control request code (HD_*)
1587 * val control request parameter value (set to 0 if unused)
1588 * timeout timeout in seconds (0: no timeout)
1589 * return value:
1590 * 0 on success
1591 * -EBUSY if another request is pending
1592 * any URB submission error code
1593 */
1594 static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
1595 {
1596 struct bas_cardstate *ucs = bcs->cs->hw.bas;
1597 int ret;
1598 unsigned long flags;
1599
1600 gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1601
1602 spin_lock_irqsave(&ucs->lock, flags);
1603 if (ucs->pending) {
1604 spin_unlock_irqrestore(&ucs->lock, flags);
1605 dev_err(bcs->cs->dev,
1606 "submission of request 0x%02x failed: "
1607 "request 0x%02x still pending\n",
1608 req, ucs->pending);
1609 return -EBUSY;
1610 }
1611
1612 ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
1613 ucs->dr_ctrl.bRequest = req;
1614 ucs->dr_ctrl.wValue = cpu_to_le16(val);
1615 ucs->dr_ctrl.wIndex = 0;
1616 ucs->dr_ctrl.wLength = 0;
1617 usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1618 usb_sndctrlpipe(ucs->udev, 0),
1619 (unsigned char *) &ucs->dr_ctrl, NULL, 0,
1620 write_ctrl_callback, ucs);
1621 ucs->retry_ctrl = 0;
1622 ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
1623 if (unlikely(ret)) {
1624 dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
1625 req, get_usb_rcmsg(ret));
1626 spin_unlock_irqrestore(&ucs->lock, flags);
1627 return ret;
1628 }
1629 ucs->pending = req;
1630
1631 if (timeout > 0) {
1632 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1633 mod_timer(&ucs->timer_ctrl, jiffies + timeout * HZ / 10);
1634 }
1635
1636 spin_unlock_irqrestore(&ucs->lock, flags);
1637 return 0;
1638 }
1639
1640 /* gigaset_init_bchannel
1641 * called by common.c to connect a B channel
1642 * initialize isochronous I/O and tell the Gigaset base to open the channel
1643 * argument:
1644 * B channel control structure
1645 * return value:
1646 * 0 on success, error code < 0 on error
1647 */
1648 static int gigaset_init_bchannel(struct bc_state *bcs)
1649 {
1650 struct cardstate *cs = bcs->cs;
1651 int req, ret;
1652 unsigned long flags;
1653
1654 spin_lock_irqsave(&cs->lock, flags);
1655 if (unlikely(!cs->connected)) {
1656 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1657 spin_unlock_irqrestore(&cs->lock, flags);
1658 return -ENODEV;
1659 }
1660
1661 if (cs->hw.bas->basstate & BS_SUSPEND) {
1662 dev_notice(cs->dev,
1663 "not starting isoc I/O, suspend in progress\n");
1664 spin_unlock_irqrestore(&cs->lock, flags);
1665 return -EHOSTUNREACH;
1666 }
1667
1668 ret = starturbs(bcs);
1669 if (ret < 0) {
1670 spin_unlock_irqrestore(&cs->lock, flags);
1671 dev_err(cs->dev,
1672 "could not start isoc I/O for channel B%d: %s\n",
1673 bcs->channel + 1,
1674 ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
1675 if (ret != -ENODEV)
1676 error_hangup(bcs);
1677 return ret;
1678 }
1679
1680 req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
1681 ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1682 if (ret < 0) {
1683 dev_err(cs->dev, "could not open channel B%d\n",
1684 bcs->channel + 1);
1685 stopurbs(bcs->hw.bas);
1686 }
1687
1688 spin_unlock_irqrestore(&cs->lock, flags);
1689 if (ret < 0 && ret != -ENODEV)
1690 error_hangup(bcs);
1691 return ret;
1692 }
1693
1694 /* gigaset_close_bchannel
1695 * called by common.c to disconnect a B channel
1696 * tell the Gigaset base to close the channel
1697 * stopping isochronous I/O and LL notification will be done when the
1698 * acknowledgement for the close arrives
1699 * argument:
1700 * B channel control structure
1701 * return value:
1702 * 0 on success, error code < 0 on error
1703 */
1704 static int gigaset_close_bchannel(struct bc_state *bcs)
1705 {
1706 struct cardstate *cs = bcs->cs;
1707 int req, ret;
1708 unsigned long flags;
1709
1710 spin_lock_irqsave(&cs->lock, flags);
1711 if (unlikely(!cs->connected)) {
1712 spin_unlock_irqrestore(&cs->lock, flags);
1713 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1714 return -ENODEV;
1715 }
1716
1717 if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1718 /* channel not running: just signal common.c */
1719 spin_unlock_irqrestore(&cs->lock, flags);
1720 gigaset_bchannel_down(bcs);
1721 return 0;
1722 }
1723
1724 /* channel running: tell device to close it */
1725 req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
1726 ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1727 if (ret < 0)
1728 dev_err(cs->dev, "closing channel B%d failed\n",
1729 bcs->channel + 1);
1730
1731 spin_unlock_irqrestore(&cs->lock, flags);
1732 return ret;
1733 }
1734
1735 /* Device Operations */
1736 /* ================= */
1737
1738 /* complete_cb
1739 * unqueue first command buffer from queue, waking any sleepers
1740 * must be called with cs->cmdlock held
1741 * parameter:
1742 * cs controller state structure
1743 */
1744 static void complete_cb(struct cardstate *cs)
1745 {
1746 struct cmdbuf_t *cb = cs->cmdbuf;
1747
1748 /* unqueue completed buffer */
1749 cs->cmdbytes -= cs->curlen;
1750 gig_dbg(DEBUG_OUTPUT, "write_command: sent %u bytes, %u left",
1751 cs->curlen, cs->cmdbytes);
1752 if (cb->next != NULL) {
1753 cs->cmdbuf = cb->next;
1754 cs->cmdbuf->prev = NULL;
1755 cs->curlen = cs->cmdbuf->len;
1756 } else {
1757 cs->cmdbuf = NULL;
1758 cs->lastcmdbuf = NULL;
1759 cs->curlen = 0;
1760 }
1761
1762 if (cb->wake_tasklet)
1763 tasklet_schedule(cb->wake_tasklet);
1764
1765 kfree(cb);
1766 }
1767
1768 /* write_command_callback
1769 * USB completion handler for AT command transmission
1770 * called by the USB subsystem in interrupt context
1771 * parameter:
1772 * urb USB request block of completed request
1773 * urb->context = controller state structure
1774 */
1775 static void write_command_callback(struct urb *urb)
1776 {
1777 struct cardstate *cs = urb->context;
1778 struct bas_cardstate *ucs = cs->hw.bas;
1779 int status = urb->status;
1780 unsigned long flags;
1781
1782 update_basstate(ucs, 0, BS_ATWRPEND);
1783 wake_up(&ucs->waitqueue);
1784
1785 /* check status */
1786 switch (status) {
1787 case 0: /* normal completion */
1788 break;
1789 case -ENOENT: /* cancelled */
1790 case -ECONNRESET: /* cancelled (async) */
1791 case -EINPROGRESS: /* pending */
1792 case -ENODEV: /* device removed */
1793 case -ESHUTDOWN: /* device shut down */
1794 /* ignore silently */
1795 gig_dbg(DEBUG_USBREQ, "%s: %s",
1796 __func__, get_usb_statmsg(status));
1797 return;
1798 default: /* any failure */
1799 if (++ucs->retry_cmd_out > BAS_RETRY) {
1800 dev_warn(cs->dev,
1801 "command write: %s, "
1802 "giving up after %d retries\n",
1803 get_usb_statmsg(status),
1804 ucs->retry_cmd_out);
1805 break;
1806 }
1807 if (ucs->basstate & BS_SUSPEND) {
1808 dev_warn(cs->dev,
1809 "command write: %s, "
1810 "won't retry - suspend requested\n",
1811 get_usb_statmsg(status));
1812 break;
1813 }
1814 if (cs->cmdbuf == NULL) {
1815 dev_warn(cs->dev,
1816 "command write: %s, "
1817 "cannot retry - cmdbuf gone\n",
1818 get_usb_statmsg(status));
1819 break;
1820 }
1821 dev_notice(cs->dev, "command write: %s, retry %d\n",
1822 get_usb_statmsg(status), ucs->retry_cmd_out);
1823 if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
1824 /* resubmitted - bypass regular exit block */
1825 return;
1826 /* command send failed, assume base still waiting */
1827 update_basstate(ucs, BS_ATREADY, 0);
1828 }
1829
1830 spin_lock_irqsave(&cs->cmdlock, flags);
1831 if (cs->cmdbuf != NULL)
1832 complete_cb(cs);
1833 spin_unlock_irqrestore(&cs->cmdlock, flags);
1834 }
1835
1836 /* atrdy_timeout
1837 * timeout routine for AT command transmission
1838 * argument:
1839 * controller state structure
1840 */
1841 static void atrdy_timeout(struct timer_list *t)
1842 {
1843 struct bas_cardstate *ucs = from_timer(ucs, t, timer_atrdy);
1844 struct cardstate *cs = ucs->cs;
1845
1846 dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
1847
1848 /* fake the missing signal - what else can I do? */
1849 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
1850 start_cbsend(cs);
1851 }
1852
1853 /* atwrite_submit
1854 * submit an HD_WRITE_ATMESSAGE command URB
1855 * parameters:
1856 * cs controller state structure
1857 * buf buffer containing command to send
1858 * len length of command to send
1859 * return value:
1860 * 0 on success
1861 * -EBUSY if another request is pending
1862 * any URB submission error code
1863 */
1864 static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
1865 {
1866 struct bas_cardstate *ucs = cs->hw.bas;
1867 int rc;
1868
1869 gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1870
1871 if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
1872 dev_err(cs->dev,
1873 "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
1874 return -EBUSY;
1875 }
1876
1877 ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
1878 ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
1879 ucs->dr_cmd_out.wValue = 0;
1880 ucs->dr_cmd_out.wIndex = 0;
1881 ucs->dr_cmd_out.wLength = cpu_to_le16(len);
1882 usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
1883 usb_sndctrlpipe(ucs->udev, 0),
1884 (unsigned char *) &ucs->dr_cmd_out, buf, len,
1885 write_command_callback, cs);
1886 rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
1887 if (unlikely(rc)) {
1888 update_basstate(ucs, 0, BS_ATWRPEND);
1889 dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
1890 get_usb_rcmsg(rc));
1891 return rc;
1892 }
1893
1894 /* submitted successfully, start timeout if necessary */
1895 if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
1896 gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
1897 ATRDY_TIMEOUT);
1898 mod_timer(&ucs->timer_atrdy, jiffies + ATRDY_TIMEOUT * HZ / 10);
1899 }
1900 return 0;
1901 }
1902
1903 /* start_cbsend
1904 * start transmission of AT command queue if necessary
1905 * parameter:
1906 * cs controller state structure
1907 * return value:
1908 * 0 on success
1909 * error code < 0 on error
1910 */
1911 static int start_cbsend(struct cardstate *cs)
1912 {
1913 struct cmdbuf_t *cb;
1914 struct bas_cardstate *ucs = cs->hw.bas;
1915 unsigned long flags;
1916 int rc;
1917 int retval = 0;
1918
1919 /* check if suspend requested */
1920 if (ucs->basstate & BS_SUSPEND) {
1921 gig_dbg(DEBUG_OUTPUT, "suspending");
1922 return -EHOSTUNREACH;
1923 }
1924
1925 /* check if AT channel is open */
1926 if (!(ucs->basstate & BS_ATOPEN)) {
1927 gig_dbg(DEBUG_OUTPUT, "AT channel not open");
1928 rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
1929 if (rc < 0) {
1930 /* flush command queue */
1931 spin_lock_irqsave(&cs->cmdlock, flags);
1932 while (cs->cmdbuf != NULL)
1933 complete_cb(cs);
1934 spin_unlock_irqrestore(&cs->cmdlock, flags);
1935 }
1936 return rc;
1937 }
1938
1939 /* try to send first command in queue */
1940 spin_lock_irqsave(&cs->cmdlock, flags);
1941
1942 while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
1943 ucs->retry_cmd_out = 0;
1944 rc = atwrite_submit(cs, cb->buf, cb->len);
1945 if (unlikely(rc)) {
1946 retval = rc;
1947 complete_cb(cs);
1948 }
1949 }
1950
1951 spin_unlock_irqrestore(&cs->cmdlock, flags);
1952 return retval;
1953 }
1954
1955 /* gigaset_write_cmd
1956 * This function is called by the device independent part of the driver
1957 * to transmit an AT command string to the Gigaset device.
1958 * It encapsulates the device specific method for transmission over the
1959 * direct USB connection to the base.
1960 * The command string is added to the queue of commands to send, and
1961 * USB transmission is started if necessary.
1962 * parameters:
1963 * cs controller state structure
1964 * cb command buffer structure
1965 * return value:
1966 * number of bytes queued on success
1967 * error code < 0 on error
1968 */
1969 static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb)
1970 {
1971 unsigned long flags;
1972 int rc;
1973
1974 gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
1975 DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1976 "CMD Transmit", cb->len, cb->buf);
1977
1978 /* translate "+++" escape sequence sent as a single separate command
1979 * into "close AT channel" command for error recovery
1980 * The next command will reopen the AT channel automatically.
1981 */
1982 if (cb->len == 3 && !memcmp(cb->buf, "+++", 3)) {
1983 /* If an HD_RECEIVEATDATA_ACK message remains unhandled
1984 * because of an error, the base never sends another one.
1985 * The response channel is thus effectively blocked.
1986 * Closing and reopening the AT channel does *not* clear
1987 * this condition.
1988 * As a stopgap measure, submit a zero-length AT read
1989 * before closing the AT channel. This has the undocumented
1990 * effect of triggering a new HD_RECEIVEATDATA_ACK message
1991 * from the base if necessary.
1992 * The subsequent AT channel close then discards any pending
1993 * messages.
1994 */
1995 spin_lock_irqsave(&cs->lock, flags);
1996 if (!(cs->hw.bas->basstate & BS_ATRDPEND)) {
1997 kfree(cs->hw.bas->rcvbuf);
1998 cs->hw.bas->rcvbuf = NULL;
1999 cs->hw.bas->rcvbuf_size = 0;
2000 cs->hw.bas->retry_cmd_in = 0;
2001 atread_submit(cs, 0);
2002 }
2003 spin_unlock_irqrestore(&cs->lock, flags);
2004
2005 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
2006 if (cb->wake_tasklet)
2007 tasklet_schedule(cb->wake_tasklet);
2008 if (!rc)
2009 rc = cb->len;
2010 kfree(cb);
2011 return rc;
2012 }
2013
2014 spin_lock_irqsave(&cs->cmdlock, flags);
2015 cb->prev = cs->lastcmdbuf;
2016 if (cs->lastcmdbuf)
2017 cs->lastcmdbuf->next = cb;
2018 else {
2019 cs->cmdbuf = cb;
2020 cs->curlen = cb->len;
2021 }
2022 cs->cmdbytes += cb->len;
2023 cs->lastcmdbuf = cb;
2024 spin_unlock_irqrestore(&cs->cmdlock, flags);
2025
2026 spin_lock_irqsave(&cs->lock, flags);
2027 if (unlikely(!cs->connected)) {
2028 spin_unlock_irqrestore(&cs->lock, flags);
2029 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
2030 /* flush command queue */
2031 spin_lock_irqsave(&cs->cmdlock, flags);
2032 while (cs->cmdbuf != NULL)
2033 complete_cb(cs);
2034 spin_unlock_irqrestore(&cs->cmdlock, flags);
2035 return -ENODEV;
2036 }
2037 rc = start_cbsend(cs);
2038 spin_unlock_irqrestore(&cs->lock, flags);
2039 return rc < 0 ? rc : cb->len;
2040 }
2041
2042 /* gigaset_write_room
2043 * tty_driver.write_room interface routine
2044 * return number of characters the driver will accept to be written via
2045 * gigaset_write_cmd
2046 * parameter:
2047 * controller state structure
2048 * return value:
2049 * number of characters
2050 */
2051 static int gigaset_write_room(struct cardstate *cs)
2052 {
2053 return IF_WRITEBUF;
2054 }
2055
2056 /* gigaset_chars_in_buffer
2057 * tty_driver.chars_in_buffer interface routine
2058 * return number of characters waiting to be sent
2059 * parameter:
2060 * controller state structure
2061 * return value:
2062 * number of characters
2063 */
2064 static int gigaset_chars_in_buffer(struct cardstate *cs)
2065 {
2066 return cs->cmdbytes;
2067 }
2068
2069 /* gigaset_brkchars
2070 * implementation of ioctl(GIGASET_BRKCHARS)
2071 * parameter:
2072 * controller state structure
2073 * return value:
2074 * -EINVAL (unimplemented function)
2075 */
2076 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
2077 {
2078 return -EINVAL;
2079 }
2080
2081
2082 /* Device Initialization/Shutdown */
2083 /* ============================== */
2084
2085 /* Free hardware dependent part of the B channel structure
2086 * parameter:
2087 * bcs B channel structure
2088 */
2089 static void gigaset_freebcshw(struct bc_state *bcs)
2090 {
2091 struct bas_bc_state *ubc = bcs->hw.bas;
2092 int i;
2093
2094 if (!ubc)
2095 return;
2096
2097 /* kill URBs and tasklets before freeing - better safe than sorry */
2098 ubc->running = 0;
2099 gig_dbg(DEBUG_INIT, "%s: killing isoc URBs", __func__);
2100 for (i = 0; i < BAS_OUTURBS; ++i) {
2101 usb_kill_urb(ubc->isoouturbs[i].urb);
2102 usb_free_urb(ubc->isoouturbs[i].urb);
2103 }
2104 for (i = 0; i < BAS_INURBS; ++i) {
2105 usb_kill_urb(ubc->isoinurbs[i]);
2106 usb_free_urb(ubc->isoinurbs[i]);
2107 }
2108 tasklet_kill(&ubc->sent_tasklet);
2109 tasklet_kill(&ubc->rcvd_tasklet);
2110 kfree(ubc->isooutbuf);
2111 kfree(ubc);
2112 bcs->hw.bas = NULL;
2113 }
2114
2115 /* Initialize hardware dependent part of the B channel structure
2116 * parameter:
2117 * bcs B channel structure
2118 * return value:
2119 * 0 on success, error code < 0 on failure
2120 */
2121 static int gigaset_initbcshw(struct bc_state *bcs)
2122 {
2123 int i;
2124 struct bas_bc_state *ubc;
2125
2126 bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
2127 if (!ubc) {
2128 pr_err("out of memory\n");
2129 return -ENOMEM;
2130 }
2131
2132 ubc->running = 0;
2133 atomic_set(&ubc->corrbytes, 0);
2134 spin_lock_init(&ubc->isooutlock);
2135 for (i = 0; i < BAS_OUTURBS; ++i) {
2136 ubc->isoouturbs[i].urb = NULL;
2137 ubc->isoouturbs[i].bcs = bcs;
2138 }
2139 ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
2140 ubc->numsub = 0;
2141 ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL);
2142 if (!ubc->isooutbuf) {
2143 pr_err("out of memory\n");
2144 kfree(ubc);
2145 bcs->hw.bas = NULL;
2146 return -ENOMEM;
2147 }
2148 tasklet_init(&ubc->sent_tasklet,
2149 write_iso_tasklet, (unsigned long) bcs);
2150
2151 spin_lock_init(&ubc->isoinlock);
2152 for (i = 0; i < BAS_INURBS; ++i)
2153 ubc->isoinurbs[i] = NULL;
2154 ubc->isoindone = NULL;
2155 ubc->loststatus = -EINPROGRESS;
2156 ubc->isoinlost = 0;
2157 ubc->seqlen = 0;
2158 ubc->inbyte = 0;
2159 ubc->inbits = 0;
2160 ubc->goodbytes = 0;
2161 ubc->alignerrs = 0;
2162 ubc->fcserrs = 0;
2163 ubc->frameerrs = 0;
2164 ubc->giants = 0;
2165 ubc->runts = 0;
2166 ubc->aborts = 0;
2167 ubc->shared0s = 0;
2168 ubc->stolen0s = 0;
2169 tasklet_init(&ubc->rcvd_tasklet,
2170 read_iso_tasklet, (unsigned long) bcs);
2171 return 0;
2172 }
2173
2174 static void gigaset_reinitbcshw(struct bc_state *bcs)
2175 {
2176 struct bas_bc_state *ubc = bcs->hw.bas;
2177
2178 bcs->hw.bas->running = 0;
2179 atomic_set(&bcs->hw.bas->corrbytes, 0);
2180 bcs->hw.bas->numsub = 0;
2181 spin_lock_init(&ubc->isooutlock);
2182 spin_lock_init(&ubc->isoinlock);
2183 ubc->loststatus = -EINPROGRESS;
2184 }
2185
2186 static void gigaset_freecshw(struct cardstate *cs)
2187 {
2188 /* timers, URBs and rcvbuf are disposed of in disconnect */
2189 kfree(cs->hw.bas->int_in_buf);
2190 kfree(cs->hw.bas);
2191 cs->hw.bas = NULL;
2192 }
2193
2194 /* Initialize hardware dependent part of the cardstate structure
2195 * parameter:
2196 * cs cardstate structure
2197 * return value:
2198 * 0 on success, error code < 0 on failure
2199 */
2200 static int gigaset_initcshw(struct cardstate *cs)
2201 {
2202 struct bas_cardstate *ucs;
2203
2204 cs->hw.bas = ucs = kzalloc(sizeof(*ucs), GFP_KERNEL);
2205 if (!ucs) {
2206 pr_err("out of memory\n");
2207 return -ENOMEM;
2208 }
2209 ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
2210 if (!ucs->int_in_buf) {
2211 kfree(ucs);
2212 pr_err("out of memory\n");
2213 return -ENOMEM;
2214 }
2215
2216 spin_lock_init(&ucs->lock);
2217 ucs->cs = cs;
2218 timer_setup(&ucs->timer_ctrl, req_timeout, 0);
2219 timer_setup(&ucs->timer_atrdy, atrdy_timeout, 0);
2220 timer_setup(&ucs->timer_cmd_in, cmd_in_timeout, 0);
2221 timer_setup(&ucs->timer_int_in, int_in_resubmit, 0);
2222 init_waitqueue_head(&ucs->waitqueue);
2223 INIT_WORK(&ucs->int_in_wq, int_in_work);
2224
2225 return 0;
2226 }
2227
2228 /* freeurbs
2229 * unlink and deallocate all URBs unconditionally
2230 * caller must make sure that no commands are still in progress
2231 * parameter:
2232 * cs controller state structure
2233 */
2234 static void freeurbs(struct cardstate *cs)
2235 {
2236 struct bas_cardstate *ucs = cs->hw.bas;
2237 struct bas_bc_state *ubc;
2238 int i, j;
2239
2240 gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
2241 for (j = 0; j < BAS_CHANNELS; ++j) {
2242 ubc = cs->bcs[j].hw.bas;
2243 for (i = 0; i < BAS_OUTURBS; ++i) {
2244 usb_kill_urb(ubc->isoouturbs[i].urb);
2245 usb_free_urb(ubc->isoouturbs[i].urb);
2246 ubc->isoouturbs[i].urb = NULL;
2247 }
2248 for (i = 0; i < BAS_INURBS; ++i) {
2249 usb_kill_urb(ubc->isoinurbs[i]);
2250 usb_free_urb(ubc->isoinurbs[i]);
2251 ubc->isoinurbs[i] = NULL;
2252 }
2253 }
2254 usb_kill_urb(ucs->urb_int_in);
2255 usb_free_urb(ucs->urb_int_in);
2256 ucs->urb_int_in = NULL;
2257 usb_kill_urb(ucs->urb_cmd_out);
2258 usb_free_urb(ucs->urb_cmd_out);
2259 ucs->urb_cmd_out = NULL;
2260 usb_kill_urb(ucs->urb_cmd_in);
2261 usb_free_urb(ucs->urb_cmd_in);
2262 ucs->urb_cmd_in = NULL;
2263 usb_kill_urb(ucs->urb_ctrl);
2264 usb_free_urb(ucs->urb_ctrl);
2265 ucs->urb_ctrl = NULL;
2266 }
2267
2268 /* gigaset_probe
2269 * This function is called when a new USB device is connected.
2270 * It checks whether the new device is handled by this driver.
2271 */
2272 static int gigaset_probe(struct usb_interface *interface,
2273 const struct usb_device_id *id)
2274 {
2275 struct usb_host_interface *hostif;
2276 struct usb_device *udev = interface_to_usbdev(interface);
2277 struct cardstate *cs = NULL;
2278 struct bas_cardstate *ucs = NULL;
2279 struct bas_bc_state *ubc;
2280 struct usb_endpoint_descriptor *endpoint;
2281 int i, j;
2282 int rc;
2283
2284 gig_dbg(DEBUG_INIT,
2285 "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
2286 __func__, le16_to_cpu(udev->descriptor.idVendor),
2287 le16_to_cpu(udev->descriptor.idProduct));
2288
2289 /* set required alternate setting */
2290 hostif = interface->cur_altsetting;
2291 if (hostif->desc.bAlternateSetting != 3) {
2292 gig_dbg(DEBUG_INIT,
2293 "%s: wrong alternate setting %d - trying to switch",
2294 __func__, hostif->desc.bAlternateSetting);
2295 if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3)
2296 < 0) {
2297 dev_warn(&udev->dev, "usb_set_interface failed, "
2298 "device %d interface %d altsetting %d\n",
2299 udev->devnum, hostif->desc.bInterfaceNumber,
2300 hostif->desc.bAlternateSetting);
2301 return -ENODEV;
2302 }
2303 hostif = interface->cur_altsetting;
2304 }
2305
2306 /* Reject application specific interfaces
2307 */
2308 if (hostif->desc.bInterfaceClass != 255) {
2309 dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
2310 __func__, hostif->desc.bInterfaceClass);
2311 return -ENODEV;
2312 }
2313
2314 if (hostif->desc.bNumEndpoints < 1)
2315 return -ENODEV;
2316
2317 dev_info(&udev->dev,
2318 "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
2319 __func__, le16_to_cpu(udev->descriptor.idVendor),
2320 le16_to_cpu(udev->descriptor.idProduct));
2321
2322 /* allocate memory for our device state and initialize it */
2323 cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
2324 GIGASET_MODULENAME);
2325 if (!cs)
2326 return -ENODEV;
2327 ucs = cs->hw.bas;
2328
2329 /* save off device structure ptrs for later use */
2330 usb_get_dev(udev);
2331 ucs->udev = udev;
2332 ucs->interface = interface;
2333 cs->dev = &interface->dev;
2334
2335 /* allocate URBs:
2336 * - one for the interrupt pipe
2337 * - three for the different uses of the default control pipe
2338 * - three for each isochronous pipe
2339 */
2340 if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2341 !(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2342 !(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
2343 !(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
2344 goto allocerr;
2345
2346 for (j = 0; j < BAS_CHANNELS; ++j) {
2347 ubc = cs->bcs[j].hw.bas;
2348 for (i = 0; i < BAS_OUTURBS; ++i)
2349 if (!(ubc->isoouturbs[i].urb =
2350 usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2351 goto allocerr;
2352 for (i = 0; i < BAS_INURBS; ++i)
2353 if (!(ubc->isoinurbs[i] =
2354 usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2355 goto allocerr;
2356 }
2357
2358 ucs->rcvbuf = NULL;
2359 ucs->rcvbuf_size = 0;
2360
2361 /* Fill the interrupt urb and send it to the core */
2362 endpoint = &hostif->endpoint[0].desc;
2363 usb_fill_int_urb(ucs->urb_int_in, udev,
2364 usb_rcvintpipe(udev,
2365 usb_endpoint_num(endpoint)),
2366 ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
2367 endpoint->bInterval);
2368 rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2369 if (rc != 0) {
2370 dev_err(cs->dev, "could not submit interrupt URB: %s\n",
2371 get_usb_rcmsg(rc));
2372 goto error;
2373 }
2374 ucs->retry_int_in = 0;
2375
2376 /* tell the device that the driver is ready */
2377 rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0);
2378 if (rc != 0)
2379 goto error;
2380
2381 /* tell common part that the device is ready */
2382 if (startmode == SM_LOCKED)
2383 cs->mstate = MS_LOCKED;
2384
2385 /* save address of controller structure */
2386 usb_set_intfdata(interface, cs);
2387
2388 rc = gigaset_start(cs);
2389 if (rc < 0)
2390 goto error;
2391
2392 return 0;
2393
2394 allocerr:
2395 dev_err(cs->dev, "could not allocate URBs\n");
2396 rc = -ENOMEM;
2397 error:
2398 freeurbs(cs);
2399 usb_set_intfdata(interface, NULL);
2400 usb_put_dev(udev);
2401 gigaset_freecs(cs);
2402 return rc;
2403 }
2404
2405 /* gigaset_disconnect
2406 * This function is called when the Gigaset base is unplugged.
2407 */
2408 static void gigaset_disconnect(struct usb_interface *interface)
2409 {
2410 struct cardstate *cs;
2411 struct bas_cardstate *ucs;
2412 int j;
2413
2414 cs = usb_get_intfdata(interface);
2415
2416 ucs = cs->hw.bas;
2417
2418 dev_info(cs->dev, "disconnecting Gigaset base\n");
2419
2420 /* mark base as not ready, all channels disconnected */
2421 ucs->basstate = 0;
2422
2423 /* tell LL all channels are down */
2424 for (j = 0; j < BAS_CHANNELS; ++j)
2425 gigaset_bchannel_down(cs->bcs + j);
2426
2427 /* stop driver (common part) */
2428 gigaset_stop(cs);
2429
2430 /* stop delayed work and URBs, free ressources */
2431 del_timer_sync(&ucs->timer_ctrl);
2432 del_timer_sync(&ucs->timer_atrdy);
2433 del_timer_sync(&ucs->timer_cmd_in);
2434 del_timer_sync(&ucs->timer_int_in);
2435 cancel_work_sync(&ucs->int_in_wq);
2436 freeurbs(cs);
2437 usb_set_intfdata(interface, NULL);
2438 kfree(ucs->rcvbuf);
2439 ucs->rcvbuf = NULL;
2440 ucs->rcvbuf_size = 0;
2441 usb_put_dev(ucs->udev);
2442 ucs->interface = NULL;
2443 ucs->udev = NULL;
2444 cs->dev = NULL;
2445 gigaset_freecs(cs);
2446 }
2447
2448 /* gigaset_suspend
2449 * This function is called before the USB connection is suspended
2450 * or before the USB device is reset.
2451 * In the latter case, message == PMSG_ON.
2452 */
2453 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
2454 {
2455 struct cardstate *cs = usb_get_intfdata(intf);
2456 struct bas_cardstate *ucs = cs->hw.bas;
2457 int rc;
2458
2459 /* set suspend flag; this stops AT command/response traffic */
2460 if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
2461 gig_dbg(DEBUG_SUSPEND, "already suspended");
2462 return 0;
2463 }
2464
2465 /* wait a bit for blocking conditions to go away */
2466 rc = wait_event_timeout(ucs->waitqueue,
2467 !(ucs->basstate &
2468 (BS_B1OPEN | BS_B2OPEN | BS_ATRDPEND | BS_ATWRPEND)),
2469 BAS_TIMEOUT * HZ / 10);
2470 gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
2471
2472 /* check for conditions preventing suspend */
2473 if (ucs->basstate & (BS_B1OPEN | BS_B2OPEN | BS_ATRDPEND | BS_ATWRPEND)) {
2474 dev_warn(cs->dev, "cannot suspend:\n");
2475 if (ucs->basstate & BS_B1OPEN)
2476 dev_warn(cs->dev, " B channel 1 open\n");
2477 if (ucs->basstate & BS_B2OPEN)
2478 dev_warn(cs->dev, " B channel 2 open\n");
2479 if (ucs->basstate & BS_ATRDPEND)
2480 dev_warn(cs->dev, " receiving AT reply\n");
2481 if (ucs->basstate & BS_ATWRPEND)
2482 dev_warn(cs->dev, " sending AT command\n");
2483 update_basstate(ucs, 0, BS_SUSPEND);
2484 return -EBUSY;
2485 }
2486
2487 /* close AT channel if open */
2488 if (ucs->basstate & BS_ATOPEN) {
2489 gig_dbg(DEBUG_SUSPEND, "closing AT channel");
2490 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
2491 if (rc) {
2492 update_basstate(ucs, 0, BS_SUSPEND);
2493 return rc;
2494 }
2495 wait_event_timeout(ucs->waitqueue, !ucs->pending,
2496 BAS_TIMEOUT * HZ / 10);
2497 /* in case of timeout, proceed anyway */
2498 }
2499
2500 /* kill all URBs and delayed work that might still be pending */
2501 usb_kill_urb(ucs->urb_ctrl);
2502 usb_kill_urb(ucs->urb_int_in);
2503 del_timer_sync(&ucs->timer_ctrl);
2504 del_timer_sync(&ucs->timer_atrdy);
2505 del_timer_sync(&ucs->timer_cmd_in);
2506 del_timer_sync(&ucs->timer_int_in);
2507
2508 /* don't try to cancel int_in_wq from within reset as it
2509 * might be the one requesting the reset
2510 */
2511 if (message.event != PM_EVENT_ON)
2512 cancel_work_sync(&ucs->int_in_wq);
2513
2514 gig_dbg(DEBUG_SUSPEND, "suspend complete");
2515 return 0;
2516 }
2517
2518 /* gigaset_resume
2519 * This function is called after the USB connection has been resumed.
2520 */
2521 static int gigaset_resume(struct usb_interface *intf)
2522 {
2523 struct cardstate *cs = usb_get_intfdata(intf);
2524 struct bas_cardstate *ucs = cs->hw.bas;
2525 int rc;
2526
2527 /* resubmit interrupt URB for spontaneous messages from base */
2528 rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2529 if (rc) {
2530 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
2531 get_usb_rcmsg(rc));
2532 return rc;
2533 }
2534 ucs->retry_int_in = 0;
2535
2536 /* clear suspend flag to reallow activity */
2537 update_basstate(ucs, 0, BS_SUSPEND);
2538
2539 gig_dbg(DEBUG_SUSPEND, "resume complete");
2540 return 0;
2541 }
2542
2543 /* gigaset_pre_reset
2544 * This function is called before the USB connection is reset.
2545 */
2546 static int gigaset_pre_reset(struct usb_interface *intf)
2547 {
2548 /* handle just like suspend */
2549 return gigaset_suspend(intf, PMSG_ON);
2550 }
2551
2552 /* gigaset_post_reset
2553 * This function is called after the USB connection has been reset.
2554 */
2555 static int gigaset_post_reset(struct usb_interface *intf)
2556 {
2557 /* FIXME: send HD_DEVICE_INIT_ACK? */
2558
2559 /* resume operations */
2560 return gigaset_resume(intf);
2561 }
2562
2563
2564 static const struct gigaset_ops gigops = {
2565 .write_cmd = gigaset_write_cmd,
2566 .write_room = gigaset_write_room,
2567 .chars_in_buffer = gigaset_chars_in_buffer,
2568 .brkchars = gigaset_brkchars,
2569 .init_bchannel = gigaset_init_bchannel,
2570 .close_bchannel = gigaset_close_bchannel,
2571 .initbcshw = gigaset_initbcshw,
2572 .freebcshw = gigaset_freebcshw,
2573 .reinitbcshw = gigaset_reinitbcshw,
2574 .initcshw = gigaset_initcshw,
2575 .freecshw = gigaset_freecshw,
2576 .set_modem_ctrl = gigaset_set_modem_ctrl,
2577 .baud_rate = gigaset_baud_rate,
2578 .set_line_ctrl = gigaset_set_line_ctrl,
2579 .send_skb = gigaset_isoc_send_skb,
2580 .handle_input = gigaset_isoc_input,
2581 };
2582
2583 /* bas_gigaset_init
2584 * This function is called after the kernel module is loaded.
2585 */
2586 static int __init bas_gigaset_init(void)
2587 {
2588 int result;
2589
2590 /* allocate memory for our driver state and initialize it */
2591 driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2592 GIGASET_MODULENAME, GIGASET_DEVNAME,
2593 &gigops, THIS_MODULE);
2594 if (driver == NULL)
2595 goto error;
2596
2597 /* register this driver with the USB subsystem */
2598 result = usb_register(&gigaset_usb_driver);
2599 if (result < 0) {
2600 pr_err("error %d registering USB driver\n", -result);
2601 goto error;
2602 }
2603
2604 pr_info(DRIVER_DESC "\n");
2605 return 0;
2606
2607 error:
2608 if (driver)
2609 gigaset_freedriver(driver);
2610 driver = NULL;
2611 return -1;
2612 }
2613
2614 /* bas_gigaset_exit
2615 * This function is called before the kernel module is unloaded.
2616 */
2617 static void __exit bas_gigaset_exit(void)
2618 {
2619 struct bas_cardstate *ucs;
2620 int i;
2621
2622 gigaset_blockdriver(driver); /* => probe will fail
2623 * => no gigaset_start any more
2624 */
2625
2626 /* stop all connected devices */
2627 for (i = 0; i < driver->minors; i++) {
2628 if (gigaset_shutdown(driver->cs + i) < 0)
2629 continue; /* no device */
2630 /* from now on, no isdn callback should be possible */
2631
2632 /* close all still open channels */
2633 ucs = driver->cs[i].hw.bas;
2634 if (ucs->basstate & BS_B1OPEN) {
2635 gig_dbg(DEBUG_INIT, "closing B1 channel");
2636 usb_control_msg(ucs->udev,
2637 usb_sndctrlpipe(ucs->udev, 0),
2638 HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
2639 0, 0, NULL, 0, BAS_TIMEOUT);
2640 }
2641 if (ucs->basstate & BS_B2OPEN) {
2642 gig_dbg(DEBUG_INIT, "closing B2 channel");
2643 usb_control_msg(ucs->udev,
2644 usb_sndctrlpipe(ucs->udev, 0),
2645 HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
2646 0, 0, NULL, 0, BAS_TIMEOUT);
2647 }
2648 if (ucs->basstate & BS_ATOPEN) {
2649 gig_dbg(DEBUG_INIT, "closing AT channel");
2650 usb_control_msg(ucs->udev,
2651 usb_sndctrlpipe(ucs->udev, 0),
2652 HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
2653 0, 0, NULL, 0, BAS_TIMEOUT);
2654 }
2655 ucs->basstate = 0;
2656 }
2657
2658 /* deregister this driver with the USB subsystem */
2659 usb_deregister(&gigaset_usb_driver);
2660 /* this will call the disconnect-callback */
2661 /* from now on, no disconnect/probe callback should be running */
2662
2663 gigaset_freedriver(driver);
2664 driver = NULL;
2665 }
2666
2667
2668 module_init(bas_gigaset_init);
2669 module_exit(bas_gigaset_exit);
2670
2671 MODULE_AUTHOR(DRIVER_AUTHOR);
2672 MODULE_DESCRIPTION(DRIVER_DESC);
2673 MODULE_LICENSE("GPL");
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