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Linux 5.1.15
[linux/fpc-iii.git] / drivers / isdn / gigaset / bas-gigaset.c
blob149b1aca52a23e4cc28897064861abec8ce3326c
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 /* fall through */
743 case HD_OPEN_B1CHANNEL_ACK:
744 bcs = cs->bcs + channel;
745 update_basstate(ucs, BS_B1OPEN << channel, 0);
746 gigaset_bchannel_up(bcs);
747 break;
748
749 case HD_OPEN_ATCHANNEL_ACK:
750 update_basstate(ucs, BS_ATOPEN, 0);
751 start_cbsend(cs);
752 break;
753
754 case HD_CLOSE_B2CHANNEL_ACK:
755 ++channel;
756 /* fall through */
757 case HD_CLOSE_B1CHANNEL_ACK:
758 bcs = cs->bcs + channel;
759 update_basstate(ucs, 0, BS_B1OPEN << channel);
760 stopurbs(bcs->hw.bas);
761 gigaset_bchannel_down(bcs);
762 break;
763
764 case HD_CLOSE_ATCHANNEL_ACK:
765 update_basstate(ucs, 0, BS_ATOPEN);
766 break;
767
768 case HD_B2_FLOW_CONTROL:
769 ++channel;
770 /* fall through */
771 case HD_B1_FLOW_CONTROL:
772 bcs = cs->bcs + channel;
773 atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
774 &bcs->hw.bas->corrbytes);
775 gig_dbg(DEBUG_ISO,
776 "Flow control (channel %d, sub %d): 0x%02x => %d",
777 channel, bcs->hw.bas->numsub, l,
778 atomic_read(&bcs->hw.bas->corrbytes));
779 break;
780
781 case HD_RECEIVEATDATA_ACK: /* AT response ready to be received */
782 if (!l) {
783 dev_warn(cs->dev,
784 "HD_RECEIVEATDATA_ACK with length 0 ignored\n");
785 break;
786 }
787 spin_lock_irqsave(&cs->lock, flags);
788 if (ucs->basstate & BS_ATRDPEND) {
789 spin_unlock_irqrestore(&cs->lock, flags);
790 dev_warn(cs->dev,
791 "HD_RECEIVEATDATA_ACK(%d) during HD_READ_ATMESSAGE(%d) ignored\n",
792 l, ucs->rcvbuf_size);
793 break;
794 }
795 if (ucs->rcvbuf_size) {
796 /* throw away previous buffer - we have no queue */
797 dev_err(cs->dev,
798 "receive AT data overrun, %d bytes lost\n",
799 ucs->rcvbuf_size);
800 kfree(ucs->rcvbuf);
801 ucs->rcvbuf_size = 0;
802 }
803 ucs->rcvbuf = kmalloc(l, GFP_ATOMIC);
804 if (ucs->rcvbuf == NULL) {
805 spin_unlock_irqrestore(&cs->lock, flags);
806 dev_err(cs->dev, "out of memory receiving AT data\n");
807 break;
808 }
809 ucs->rcvbuf_size = l;
810 ucs->retry_cmd_in = 0;
811 rc = atread_submit(cs, BAS_TIMEOUT);
812 if (rc < 0) {
813 kfree(ucs->rcvbuf);
814 ucs->rcvbuf = NULL;
815 ucs->rcvbuf_size = 0;
816 }
817 spin_unlock_irqrestore(&cs->lock, flags);
818 if (rc < 0 && rc != -ENODEV)
819 error_reset(cs);
820 break;
821
822 case HD_RESET_INTERRUPT_PIPE_ACK:
823 update_basstate(ucs, 0, BS_RESETTING);
824 dev_notice(cs->dev, "interrupt pipe reset\n");
825 break;
826
827 case HD_SUSPEND_END:
828 gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
829 break;
830
831 default:
832 dev_warn(cs->dev,
833 "unknown Gigaset signal 0x%02x (%u) ignored\n",
834 (int) ucs->int_in_buf[0], l);
835 }
836
837 check_pending(ucs);
838 wake_up(&ucs->waitqueue);
839
840 resubmit:
841 rc = usb_submit_urb(urb, GFP_ATOMIC);
842 if (unlikely(rc != 0 && rc != -ENODEV)) {
843 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
844 get_usb_rcmsg(rc));
845 error_reset(cs);
846 }
847 }
848
849 /* read_iso_callback
850 * USB completion handler for B channel isochronous input
851 * called by the USB subsystem in interrupt context
852 * parameter:
853 * urb USB request block of completed request
854 * urb->context = bc_state structure
855 */
856 static void read_iso_callback(struct urb *urb)
857 {
858 struct bc_state *bcs;
859 struct bas_bc_state *ubc;
860 int status = urb->status;
861 unsigned long flags;
862 int i, rc;
863
864 /* status codes not worth bothering the tasklet with */
865 if (unlikely(status == -ENOENT ||
866 status == -ECONNRESET ||
867 status == -EINPROGRESS ||
868 status == -ENODEV ||
869 status == -ESHUTDOWN)) {
870 gig_dbg(DEBUG_ISO, "%s: %s",
871 __func__, get_usb_statmsg(status));
872 return;
873 }
874
875 bcs = urb->context;
876 ubc = bcs->hw.bas;
877
878 spin_lock_irqsave(&ubc->isoinlock, flags);
879 if (likely(ubc->isoindone == NULL)) {
880 /* pass URB to tasklet */
881 ubc->isoindone = urb;
882 ubc->isoinstatus = status;
883 tasklet_hi_schedule(&ubc->rcvd_tasklet);
884 } else {
885 /* tasklet still busy, drop data and resubmit URB */
886 gig_dbg(DEBUG_ISO, "%s: overrun", __func__);
887 ubc->loststatus = status;
888 for (i = 0; i < BAS_NUMFRAMES; i++) {
889 ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
890 if (unlikely(urb->iso_frame_desc[i].status != 0 &&
891 urb->iso_frame_desc[i].status != -EINPROGRESS))
892 ubc->loststatus = urb->iso_frame_desc[i].status;
893 urb->iso_frame_desc[i].status = 0;
894 urb->iso_frame_desc[i].actual_length = 0;
895 }
896 if (likely(ubc->running)) {
897 /* urb->dev is clobbered by USB subsystem */
898 urb->dev = bcs->cs->hw.bas->udev;
899 urb->transfer_flags = URB_ISO_ASAP;
900 urb->number_of_packets = BAS_NUMFRAMES;
901 rc = usb_submit_urb(urb, GFP_ATOMIC);
902 if (unlikely(rc != 0 && rc != -ENODEV)) {
903 dev_err(bcs->cs->dev,
904 "could not resubmit isoc read URB: %s\n",
905 get_usb_rcmsg(rc));
906 dump_urb(DEBUG_ISO, "isoc read", urb);
907 error_hangup(bcs);
908 }
909 }
910 }
911 spin_unlock_irqrestore(&ubc->isoinlock, flags);
912 }
913
914 /* write_iso_callback
915 * USB completion handler for B channel isochronous output
916 * called by the USB subsystem in interrupt context
917 * parameter:
918 * urb USB request block of completed request
919 * urb->context = isow_urbctx_t structure
920 */
921 static void write_iso_callback(struct urb *urb)
922 {
923 struct isow_urbctx_t *ucx;
924 struct bas_bc_state *ubc;
925 int status = urb->status;
926 unsigned long flags;
927
928 /* status codes not worth bothering the tasklet with */
929 if (unlikely(status == -ENOENT ||
930 status == -ECONNRESET ||
931 status == -EINPROGRESS ||
932 status == -ENODEV ||
933 status == -ESHUTDOWN)) {
934 gig_dbg(DEBUG_ISO, "%s: %s",
935 __func__, get_usb_statmsg(status));
936 return;
937 }
938
939 /* pass URB context to tasklet */
940 ucx = urb->context;
941 ubc = ucx->bcs->hw.bas;
942 ucx->status = status;
943
944 spin_lock_irqsave(&ubc->isooutlock, flags);
945 ubc->isooutovfl = ubc->isooutdone;
946 ubc->isooutdone = ucx;
947 spin_unlock_irqrestore(&ubc->isooutlock, flags);
948 tasklet_hi_schedule(&ubc->sent_tasklet);
949 }
950
951 /* starturbs
952 * prepare and submit USB request blocks for isochronous input and output
953 * argument:
954 * B channel control structure
955 * return value:
956 * 0 on success
957 * < 0 on error (no URBs submitted)
958 */
959 static int starturbs(struct bc_state *bcs)
960 {
961 struct usb_device *udev = bcs->cs->hw.bas->udev;
962 struct bas_bc_state *ubc = bcs->hw.bas;
963 struct urb *urb;
964 int j, k;
965 int rc;
966
967 /* initialize L2 reception */
968 if (bcs->proto2 == L2_HDLC)
969 bcs->inputstate |= INS_flag_hunt;
970
971 /* submit all isochronous input URBs */
972 ubc->running = 1;
973 for (k = 0; k < BAS_INURBS; k++) {
974 urb = ubc->isoinurbs[k];
975 if (!urb) {
976 rc = -EFAULT;
977 goto error;
978 }
979 usb_fill_int_urb(urb, udev,
980 usb_rcvisocpipe(udev, 3 + 2 * bcs->channel),
981 ubc->isoinbuf + k * BAS_INBUFSIZE,
982 BAS_INBUFSIZE, read_iso_callback, bcs,
983 BAS_FRAMETIME);
984
985 urb->transfer_flags = URB_ISO_ASAP;
986 urb->number_of_packets = BAS_NUMFRAMES;
987 for (j = 0; j < BAS_NUMFRAMES; j++) {
988 urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
989 urb->iso_frame_desc[j].length = BAS_MAXFRAME;
990 urb->iso_frame_desc[j].status = 0;
991 urb->iso_frame_desc[j].actual_length = 0;
992 }
993
994 dump_urb(DEBUG_ISO, "Initial isoc read", urb);
995 rc = usb_submit_urb(urb, GFP_ATOMIC);
996 if (rc != 0)
997 goto error;
998 }
999
1000 /* initialize L2 transmission */
1001 gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
1002
1003 /* set up isochronous output URBs for flag idling */
1004 for (k = 0; k < BAS_OUTURBS; ++k) {
1005 urb = ubc->isoouturbs[k].urb;
1006 if (!urb) {
1007 rc = -EFAULT;
1008 goto error;
1009 }
1010 usb_fill_int_urb(urb, udev,
1011 usb_sndisocpipe(udev, 4 + 2 * bcs->channel),
1012 ubc->isooutbuf->data,
1013 sizeof(ubc->isooutbuf->data),
1014 write_iso_callback, &ubc->isoouturbs[k],
1015 BAS_FRAMETIME);
1016
1017 urb->transfer_flags = URB_ISO_ASAP;
1018 urb->number_of_packets = BAS_NUMFRAMES;
1019 for (j = 0; j < BAS_NUMFRAMES; ++j) {
1020 urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
1021 urb->iso_frame_desc[j].length = BAS_NORMFRAME;
1022 urb->iso_frame_desc[j].status = 0;
1023 urb->iso_frame_desc[j].actual_length = 0;
1024 }
1025 ubc->isoouturbs[k].limit = -1;
1026 }
1027
1028 /* keep one URB free, submit the others */
1029 for (k = 0; k < BAS_OUTURBS - 1; ++k) {
1030 dump_urb(DEBUG_ISO, "Initial isoc write", urb);
1031 rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
1032 if (rc != 0)
1033 goto error;
1034 }
1035 dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
1036 ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS - 1];
1037 ubc->isooutdone = ubc->isooutovfl = NULL;
1038 return 0;
1039 error:
1040 stopurbs(ubc);
1041 return rc;
1042 }
1043
1044 /* stopurbs
1045 * cancel the USB request blocks for isochronous input and output
1046 * errors are silently ignored
1047 * argument:
1048 * B channel control structure
1049 */
1050 static void stopurbs(struct bas_bc_state *ubc)
1051 {
1052 int k, rc;
1053
1054 ubc->running = 0;
1055
1056 for (k = 0; k < BAS_INURBS; ++k) {
1057 rc = usb_unlink_urb(ubc->isoinurbs[k]);
1058 gig_dbg(DEBUG_ISO,
1059 "%s: isoc input URB %d unlinked, result = %s",
1060 __func__, k, get_usb_rcmsg(rc));
1061 }
1062
1063 for (k = 0; k < BAS_OUTURBS; ++k) {
1064 rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
1065 gig_dbg(DEBUG_ISO,
1066 "%s: isoc output URB %d unlinked, result = %s",
1067 __func__, k, get_usb_rcmsg(rc));
1068 }
1069 }
1070
1071 /* Isochronous Write - Bottom Half */
1072 /* =============================== */
1073
1074 /* submit_iso_write_urb
1075 * fill and submit the next isochronous write URB
1076 * parameters:
1077 * ucx context structure containing URB
1078 * return value:
1079 * number of frames submitted in URB
1080 * 0 if URB not submitted because no data available (isooutbuf busy)
1081 * error code < 0 on error
1082 */
1083 static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
1084 {
1085 struct urb *urb = ucx->urb;
1086 struct bas_bc_state *ubc = ucx->bcs->hw.bas;
1087 struct usb_iso_packet_descriptor *ifd;
1088 int corrbytes, nframe, rc;
1089
1090 /* urb->dev is clobbered by USB subsystem */
1091 urb->dev = ucx->bcs->cs->hw.bas->udev;
1092 urb->transfer_flags = URB_ISO_ASAP;
1093 urb->transfer_buffer = ubc->isooutbuf->data;
1094 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1095
1096 for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
1097 ifd = &urb->iso_frame_desc[nframe];
1098
1099 /* compute frame length according to flow control */
1100 ifd->length = BAS_NORMFRAME;
1101 corrbytes = atomic_read(&ubc->corrbytes);
1102 if (corrbytes != 0) {
1103 gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
1104 __func__, corrbytes);
1105 if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
1106 corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
1107 else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
1108 corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
1109 ifd->length += corrbytes;
1110 atomic_add(-corrbytes, &ubc->corrbytes);
1111 }
1112
1113 /* retrieve block of data to send */
1114 rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
1115 if (rc < 0) {
1116 if (rc == -EBUSY) {
1117 gig_dbg(DEBUG_ISO,
1118 "%s: buffer busy at frame %d",
1119 __func__, nframe);
1120 /* tasklet will be restarted from
1121 gigaset_isoc_send_skb() */
1122 } else {
1123 dev_err(ucx->bcs->cs->dev,
1124 "%s: buffer error %d at frame %d\n",
1125 __func__, rc, nframe);
1126 return rc;
1127 }
1128 break;
1129 }
1130 ifd->offset = rc;
1131 ucx->limit = ubc->isooutbuf->nextread;
1132 ifd->status = 0;
1133 ifd->actual_length = 0;
1134 }
1135 if (unlikely(nframe == 0))
1136 return 0; /* no data to send */
1137 urb->number_of_packets = nframe;
1138
1139 rc = usb_submit_urb(urb, GFP_ATOMIC);
1140 if (unlikely(rc)) {
1141 if (rc == -ENODEV)
1142 /* device removed - give up silently */
1143 gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
1144 else
1145 dev_err(ucx->bcs->cs->dev,
1146 "could not submit isoc write URB: %s\n",
1147 get_usb_rcmsg(rc));
1148 return rc;
1149 }
1150 ++ubc->numsub;
1151 return nframe;
1152 }
1153
1154 /* write_iso_tasklet
1155 * tasklet scheduled when an isochronous output URB from the Gigaset device
1156 * has completed
1157 * parameter:
1158 * data B channel state structure
1159 */
1160 static void write_iso_tasklet(unsigned long data)
1161 {
1162 struct bc_state *bcs = (struct bc_state *) data;
1163 struct bas_bc_state *ubc = bcs->hw.bas;
1164 struct cardstate *cs = bcs->cs;
1165 struct isow_urbctx_t *done, *next, *ovfl;
1166 struct urb *urb;
1167 int status;
1168 struct usb_iso_packet_descriptor *ifd;
1169 unsigned long flags;
1170 int i;
1171 struct sk_buff *skb;
1172 int len;
1173 int rc;
1174
1175 /* loop while completed URBs arrive in time */
1176 for (;;) {
1177 if (unlikely(!(ubc->running))) {
1178 gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1179 return;
1180 }
1181
1182 /* retrieve completed URBs */
1183 spin_lock_irqsave(&ubc->isooutlock, flags);
1184 done = ubc->isooutdone;
1185 ubc->isooutdone = NULL;
1186 ovfl = ubc->isooutovfl;
1187 ubc->isooutovfl = NULL;
1188 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1189 if (ovfl) {
1190 dev_err(cs->dev, "isoc write underrun\n");
1191 error_hangup(bcs);
1192 break;
1193 }
1194 if (!done)
1195 break;
1196
1197 /* submit free URB if available */
1198 spin_lock_irqsave(&ubc->isooutlock, flags);
1199 next = ubc->isooutfree;
1200 ubc->isooutfree = NULL;
1201 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1202 if (next) {
1203 rc = submit_iso_write_urb(next);
1204 if (unlikely(rc <= 0 && rc != -ENODEV)) {
1205 /* could not submit URB, put it back */
1206 spin_lock_irqsave(&ubc->isooutlock, flags);
1207 if (ubc->isooutfree == NULL) {
1208 ubc->isooutfree = next;
1209 next = NULL;
1210 }
1211 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1212 if (next) {
1213 /* couldn't put it back */
1214 dev_err(cs->dev,
1215 "losing isoc write URB\n");
1216 error_hangup(bcs);
1217 }
1218 }
1219 }
1220
1221 /* process completed URB */
1222 urb = done->urb;
1223 status = done->status;
1224 switch (status) {
1225 case -EXDEV: /* partial completion */
1226 gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1227 __func__);
1228 /* fall through - what's the difference anyway? */
1229 case 0: /* normal completion */
1230 /* inspect individual frames
1231 * assumptions (for lack of documentation):
1232 * - actual_length bytes of first frame in error are
1233 * successfully sent
1234 * - all following frames are not sent at all
1235 */
1236 for (i = 0; i < BAS_NUMFRAMES; i++) {
1237 ifd = &urb->iso_frame_desc[i];
1238 if (ifd->status ||
1239 ifd->actual_length != ifd->length) {
1240 dev_warn(cs->dev,
1241 "isoc write: frame %d[%d/%d]: %s\n",
1242 i, ifd->actual_length,
1243 ifd->length,
1244 get_usb_statmsg(ifd->status));
1245 break;
1246 }
1247 }
1248 break;
1249 case -EPIPE: /* stall - probably underrun */
1250 dev_err(cs->dev, "isoc write: stalled\n");
1251 error_hangup(bcs);
1252 break;
1253 default: /* other errors */
1254 dev_warn(cs->dev, "isoc write: %s\n",
1255 get_usb_statmsg(status));
1256 }
1257
1258 /* mark the write buffer area covered by this URB as free */
1259 if (done->limit >= 0)
1260 ubc->isooutbuf->read = done->limit;
1261
1262 /* mark URB as free */
1263 spin_lock_irqsave(&ubc->isooutlock, flags);
1264 next = ubc->isooutfree;
1265 ubc->isooutfree = done;
1266 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1267 if (next) {
1268 /* only one URB still active - resubmit one */
1269 rc = submit_iso_write_urb(next);
1270 if (unlikely(rc <= 0 && rc != -ENODEV)) {
1271 /* couldn't submit */
1272 error_hangup(bcs);
1273 }
1274 }
1275 }
1276
1277 /* process queued SKBs */
1278 while ((skb = skb_dequeue(&bcs->squeue))) {
1279 /* copy to output buffer, doing L2 encapsulation */
1280 len = skb->len;
1281 if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
1282 /* insufficient buffer space, push back onto queue */
1283 skb_queue_head(&bcs->squeue, skb);
1284 gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
1285 __func__, skb_queue_len(&bcs->squeue));
1286 break;
1287 }
1288 skb_pull(skb, len);
1289 gigaset_skb_sent(bcs, skb);
1290 dev_kfree_skb_any(skb);
1291 }
1292 }
1293
1294 /* Isochronous Read - Bottom Half */
1295 /* ============================== */
1296
1297 /* read_iso_tasklet
1298 * tasklet scheduled when an isochronous input URB from the Gigaset device
1299 * has completed
1300 * parameter:
1301 * data B channel state structure
1302 */
1303 static void read_iso_tasklet(unsigned long data)
1304 {
1305 struct bc_state *bcs = (struct bc_state *) data;
1306 struct bas_bc_state *ubc = bcs->hw.bas;
1307 struct cardstate *cs = bcs->cs;
1308 struct urb *urb;
1309 int status;
1310 struct usb_iso_packet_descriptor *ifd;
1311 char *rcvbuf;
1312 unsigned long flags;
1313 int totleft, numbytes, offset, frame, rc;
1314
1315 /* loop while more completed URBs arrive in the meantime */
1316 for (;;) {
1317 /* retrieve URB */
1318 spin_lock_irqsave(&ubc->isoinlock, flags);
1319 urb = ubc->isoindone;
1320 if (!urb) {
1321 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1322 return;
1323 }
1324 status = ubc->isoinstatus;
1325 ubc->isoindone = NULL;
1326 if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1327 dev_warn(cs->dev,
1328 "isoc read overrun, URB dropped (status: %s, %d bytes)\n",
1329 get_usb_statmsg(ubc->loststatus),
1330 ubc->isoinlost);
1331 ubc->loststatus = -EINPROGRESS;
1332 }
1333 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1334
1335 if (unlikely(!(ubc->running))) {
1336 gig_dbg(DEBUG_ISO,
1337 "%s: channel not running, "
1338 "dropped URB with status: %s",
1339 __func__, get_usb_statmsg(status));
1340 return;
1341 }
1342
1343 switch (status) {
1344 case 0: /* normal completion */
1345 break;
1346 case -EXDEV: /* inspect individual frames
1347 (we do that anyway) */
1348 gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1349 __func__);
1350 break;
1351 case -ENOENT:
1352 case -ECONNRESET:
1353 case -EINPROGRESS:
1354 gig_dbg(DEBUG_ISO, "%s: %s",
1355 __func__, get_usb_statmsg(status));
1356 continue; /* -> skip */
1357 case -EPIPE:
1358 dev_err(cs->dev, "isoc read: stalled\n");
1359 error_hangup(bcs);
1360 continue; /* -> skip */
1361 default: /* other error */
1362 dev_warn(cs->dev, "isoc read: %s\n",
1363 get_usb_statmsg(status));
1364 goto error;
1365 }
1366
1367 rcvbuf = urb->transfer_buffer;
1368 totleft = urb->actual_length;
1369 for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
1370 ifd = &urb->iso_frame_desc[frame];
1371 numbytes = ifd->actual_length;
1372 switch (ifd->status) {
1373 case 0: /* success */
1374 break;
1375 case -EPROTO: /* protocol error or unplug */
1376 case -EILSEQ:
1377 case -ETIME:
1378 /* probably just disconnected, ignore */
1379 gig_dbg(DEBUG_ISO,
1380 "isoc read: frame %d[%d]: %s\n",
1381 frame, numbytes,
1382 get_usb_statmsg(ifd->status));
1383 break;
1384 default: /* other error */
1385 /* report, assume transferred bytes are ok */
1386 dev_warn(cs->dev,
1387 "isoc read: frame %d[%d]: %s\n",
1388 frame, numbytes,
1389 get_usb_statmsg(ifd->status));
1390 }
1391 if (unlikely(numbytes > BAS_MAXFRAME))
1392 dev_warn(cs->dev,
1393 "isoc read: frame %d[%d]: %s\n",
1394 frame, numbytes,
1395 "exceeds max frame size");
1396 if (unlikely(numbytes > totleft)) {
1397 dev_warn(cs->dev,
1398 "isoc read: frame %d[%d]: %s\n",
1399 frame, numbytes,
1400 "exceeds total transfer length");
1401 numbytes = totleft;
1402 }
1403 offset = ifd->offset;
1404 if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1405 dev_warn(cs->dev,
1406 "isoc read: frame %d[%d]: %s\n",
1407 frame, numbytes,
1408 "exceeds end of buffer");
1409 numbytes = BAS_INBUFSIZE - offset;
1410 }
1411 gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
1412 totleft -= numbytes;
1413 }
1414 if (unlikely(totleft > 0))
1415 dev_warn(cs->dev, "isoc read: %d data bytes missing\n",
1416 totleft);
1417
1418 error:
1419 /* URB processed, resubmit */
1420 for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
1421 urb->iso_frame_desc[frame].status = 0;
1422 urb->iso_frame_desc[frame].actual_length = 0;
1423 }
1424 /* urb->dev is clobbered by USB subsystem */
1425 urb->dev = bcs->cs->hw.bas->udev;
1426 urb->transfer_flags = URB_ISO_ASAP;
1427 urb->number_of_packets = BAS_NUMFRAMES;
1428 rc = usb_submit_urb(urb, GFP_ATOMIC);
1429 if (unlikely(rc != 0 && rc != -ENODEV)) {
1430 dev_err(cs->dev,
1431 "could not resubmit isoc read URB: %s\n",
1432 get_usb_rcmsg(rc));
1433 dump_urb(DEBUG_ISO, "resubmit isoc read", urb);
1434 error_hangup(bcs);
1435 }
1436 }
1437 }
1438
1439 /* Channel Operations */
1440 /* ================== */
1441
1442 /* req_timeout
1443 * timeout routine for control output request
1444 * argument:
1445 * controller state structure
1446 */
1447 static void req_timeout(struct timer_list *t)
1448 {
1449 struct bas_cardstate *ucs = from_timer(ucs, t, timer_ctrl);
1450 struct cardstate *cs = ucs->cs;
1451 int pending;
1452 unsigned long flags;
1453
1454 check_pending(ucs);
1455
1456 spin_lock_irqsave(&ucs->lock, flags);
1457 pending = ucs->pending;
1458 ucs->pending = 0;
1459 spin_unlock_irqrestore(&ucs->lock, flags);
1460
1461 switch (pending) {
1462 case 0: /* no pending request */
1463 gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1464 break;
1465
1466 case HD_OPEN_ATCHANNEL:
1467 dev_err(cs->dev, "timeout opening AT channel\n");
1468 error_reset(cs);
1469 break;
1470
1471 case HD_OPEN_B1CHANNEL:
1472 dev_err(cs->dev, "timeout opening channel 1\n");
1473 error_hangup(&cs->bcs[0]);
1474 break;
1475
1476 case HD_OPEN_B2CHANNEL:
1477 dev_err(cs->dev, "timeout opening channel 2\n");
1478 error_hangup(&cs->bcs[1]);
1479 break;
1480
1481 case HD_CLOSE_ATCHANNEL:
1482 dev_err(cs->dev, "timeout closing AT channel\n");
1483 error_reset(cs);
1484 break;
1485
1486 case HD_CLOSE_B1CHANNEL:
1487 dev_err(cs->dev, "timeout closing channel 1\n");
1488 error_reset(cs);
1489 break;
1490
1491 case HD_CLOSE_B2CHANNEL:
1492 dev_err(cs->dev, "timeout closing channel 2\n");
1493 error_reset(cs);
1494 break;
1495
1496 case HD_RESET_INTERRUPT_PIPE:
1497 /* error recovery escalation */
1498 dev_err(cs->dev,
1499 "reset interrupt pipe timeout, attempting USB reset\n");
1500 usb_queue_reset_device(ucs->interface);
1501 break;
1502
1503 default:
1504 dev_warn(cs->dev, "request 0x%02x timed out, clearing\n",
1505 pending);
1506 }
1507
1508 wake_up(&ucs->waitqueue);
1509 }
1510
1511 /* write_ctrl_callback
1512 * USB completion handler for control pipe output
1513 * called by the USB subsystem in interrupt context
1514 * parameter:
1515 * urb USB request block of completed request
1516 * urb->context = hardware specific controller state structure
1517 */
1518 static void write_ctrl_callback(struct urb *urb)
1519 {
1520 struct bas_cardstate *ucs = urb->context;
1521 int status = urb->status;
1522 int rc;
1523 unsigned long flags;
1524
1525 /* check status */
1526 switch (status) {
1527 case 0: /* normal completion */
1528 spin_lock_irqsave(&ucs->lock, flags);
1529 switch (ucs->pending) {
1530 case HD_DEVICE_INIT_ACK: /* no reply expected */
1531 del_timer(&ucs->timer_ctrl);
1532 ucs->pending = 0;
1533 break;
1534 }
1535 spin_unlock_irqrestore(&ucs->lock, flags);
1536 return;
1537
1538 case -ENOENT: /* cancelled */
1539 case -ECONNRESET: /* cancelled (async) */
1540 case -EINPROGRESS: /* pending */
1541 case -ENODEV: /* device removed */
1542 case -ESHUTDOWN: /* device shut down */
1543 /* ignore silently */
1544 gig_dbg(DEBUG_USBREQ, "%s: %s",
1545 __func__, get_usb_statmsg(status));
1546 break;
1547
1548 default: /* any failure */
1549 /* don't retry if suspend requested */
1550 if (++ucs->retry_ctrl > BAS_RETRY ||
1551 (ucs->basstate & BS_SUSPEND)) {
1552 dev_err(&ucs->interface->dev,
1553 "control request 0x%02x failed: %s\n",
1554 ucs->dr_ctrl.bRequest,
1555 get_usb_statmsg(status));
1556 break; /* give up */
1557 }
1558 dev_notice(&ucs->interface->dev,
1559 "control request 0x%02x: %s, retry %d\n",
1560 ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
1561 ucs->retry_ctrl);
1562 /* urb->dev is clobbered by USB subsystem */
1563 urb->dev = ucs->udev;
1564 rc = usb_submit_urb(urb, GFP_ATOMIC);
1565 if (unlikely(rc)) {
1566 dev_err(&ucs->interface->dev,
1567 "could not resubmit request 0x%02x: %s\n",
1568 ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
1569 break;
1570 }
1571 /* resubmitted */
1572 return;
1573 }
1574
1575 /* failed, clear pending request */
1576 spin_lock_irqsave(&ucs->lock, flags);
1577 del_timer(&ucs->timer_ctrl);
1578 ucs->pending = 0;
1579 spin_unlock_irqrestore(&ucs->lock, flags);
1580 wake_up(&ucs->waitqueue);
1581 }
1582
1583 /* req_submit
1584 * submit a control output request without message buffer to the Gigaset base
1585 * and optionally start a timeout
1586 * parameters:
1587 * bcs B channel control structure
1588 * req control request code (HD_*)
1589 * val control request parameter value (set to 0 if unused)
1590 * timeout timeout in seconds (0: no timeout)
1591 * return value:
1592 * 0 on success
1593 * -EBUSY if another request is pending
1594 * any URB submission error code
1595 */
1596 static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
1597 {
1598 struct bas_cardstate *ucs = bcs->cs->hw.bas;
1599 int ret;
1600 unsigned long flags;
1601
1602 gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1603
1604 spin_lock_irqsave(&ucs->lock, flags);
1605 if (ucs->pending) {
1606 spin_unlock_irqrestore(&ucs->lock, flags);
1607 dev_err(bcs->cs->dev,
1608 "submission of request 0x%02x failed: "
1609 "request 0x%02x still pending\n",
1610 req, ucs->pending);
1611 return -EBUSY;
1612 }
1613
1614 ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
1615 ucs->dr_ctrl.bRequest = req;
1616 ucs->dr_ctrl.wValue = cpu_to_le16(val);
1617 ucs->dr_ctrl.wIndex = 0;
1618 ucs->dr_ctrl.wLength = 0;
1619 usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1620 usb_sndctrlpipe(ucs->udev, 0),
1621 (unsigned char *) &ucs->dr_ctrl, NULL, 0,
1622 write_ctrl_callback, ucs);
1623 ucs->retry_ctrl = 0;
1624 ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
1625 if (unlikely(ret)) {
1626 dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
1627 req, get_usb_rcmsg(ret));
1628 spin_unlock_irqrestore(&ucs->lock, flags);
1629 return ret;
1630 }
1631 ucs->pending = req;
1632
1633 if (timeout > 0) {
1634 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1635 mod_timer(&ucs->timer_ctrl, jiffies + timeout * HZ / 10);
1636 }
1637
1638 spin_unlock_irqrestore(&ucs->lock, flags);
1639 return 0;
1640 }
1641
1642 /* gigaset_init_bchannel
1643 * called by common.c to connect a B channel
1644 * initialize isochronous I/O and tell the Gigaset base to open the channel
1645 * argument:
1646 * B channel control structure
1647 * return value:
1648 * 0 on success, error code < 0 on error
1649 */
1650 static int gigaset_init_bchannel(struct bc_state *bcs)
1651 {
1652 struct cardstate *cs = bcs->cs;
1653 int req, ret;
1654 unsigned long flags;
1655
1656 spin_lock_irqsave(&cs->lock, flags);
1657 if (unlikely(!cs->connected)) {
1658 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1659 spin_unlock_irqrestore(&cs->lock, flags);
1660 return -ENODEV;
1661 }
1662
1663 if (cs->hw.bas->basstate & BS_SUSPEND) {
1664 dev_notice(cs->dev,
1665 "not starting isoc I/O, suspend in progress\n");
1666 spin_unlock_irqrestore(&cs->lock, flags);
1667 return -EHOSTUNREACH;
1668 }
1669
1670 ret = starturbs(bcs);
1671 if (ret < 0) {
1672 spin_unlock_irqrestore(&cs->lock, flags);
1673 dev_err(cs->dev,
1674 "could not start isoc I/O for channel B%d: %s\n",
1675 bcs->channel + 1,
1676 ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
1677 if (ret != -ENODEV)
1678 error_hangup(bcs);
1679 return ret;
1680 }
1681
1682 req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
1683 ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1684 if (ret < 0) {
1685 dev_err(cs->dev, "could not open channel B%d\n",
1686 bcs->channel + 1);
1687 stopurbs(bcs->hw.bas);
1688 }
1689
1690 spin_unlock_irqrestore(&cs->lock, flags);
1691 if (ret < 0 && ret != -ENODEV)
1692 error_hangup(bcs);
1693 return ret;
1694 }
1695
1696 /* gigaset_close_bchannel
1697 * called by common.c to disconnect a B channel
1698 * tell the Gigaset base to close the channel
1699 * stopping isochronous I/O and LL notification will be done when the
1700 * acknowledgement for the close arrives
1701 * argument:
1702 * B channel control structure
1703 * return value:
1704 * 0 on success, error code < 0 on error
1705 */
1706 static int gigaset_close_bchannel(struct bc_state *bcs)
1707 {
1708 struct cardstate *cs = bcs->cs;
1709 int req, ret;
1710 unsigned long flags;
1711
1712 spin_lock_irqsave(&cs->lock, flags);
1713 if (unlikely(!cs->connected)) {
1714 spin_unlock_irqrestore(&cs->lock, flags);
1715 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1716 return -ENODEV;
1717 }
1718
1719 if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1720 /* channel not running: just signal common.c */
1721 spin_unlock_irqrestore(&cs->lock, flags);
1722 gigaset_bchannel_down(bcs);
1723 return 0;
1724 }
1725
1726 /* channel running: tell device to close it */
1727 req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
1728 ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1729 if (ret < 0)
1730 dev_err(cs->dev, "closing channel B%d failed\n",
1731 bcs->channel + 1);
1732
1733 spin_unlock_irqrestore(&cs->lock, flags);
1734 return ret;
1735 }
1736
1737 /* Device Operations */
1738 /* ================= */
1739
1740 /* complete_cb
1741 * unqueue first command buffer from queue, waking any sleepers
1742 * must be called with cs->cmdlock held
1743 * parameter:
1744 * cs controller state structure
1745 */
1746 static void complete_cb(struct cardstate *cs)
1747 {
1748 struct cmdbuf_t *cb = cs->cmdbuf;
1749
1750 /* unqueue completed buffer */
1751 cs->cmdbytes -= cs->curlen;
1752 gig_dbg(DEBUG_OUTPUT, "write_command: sent %u bytes, %u left",
1753 cs->curlen, cs->cmdbytes);
1754 if (cb->next != NULL) {
1755 cs->cmdbuf = cb->next;
1756 cs->cmdbuf->prev = NULL;
1757 cs->curlen = cs->cmdbuf->len;
1758 } else {
1759 cs->cmdbuf = NULL;
1760 cs->lastcmdbuf = NULL;
1761 cs->curlen = 0;
1762 }
1763
1764 if (cb->wake_tasklet)
1765 tasklet_schedule(cb->wake_tasklet);
1766
1767 kfree(cb);
1768 }
1769
1770 /* write_command_callback
1771 * USB completion handler for AT command transmission
1772 * called by the USB subsystem in interrupt context
1773 * parameter:
1774 * urb USB request block of completed request
1775 * urb->context = controller state structure
1776 */
1777 static void write_command_callback(struct urb *urb)
1778 {
1779 struct cardstate *cs = urb->context;
1780 struct bas_cardstate *ucs = cs->hw.bas;
1781 int status = urb->status;
1782 unsigned long flags;
1783
1784 update_basstate(ucs, 0, BS_ATWRPEND);
1785 wake_up(&ucs->waitqueue);
1786
1787 /* check status */
1788 switch (status) {
1789 case 0: /* normal completion */
1790 break;
1791 case -ENOENT: /* cancelled */
1792 case -ECONNRESET: /* cancelled (async) */
1793 case -EINPROGRESS: /* pending */
1794 case -ENODEV: /* device removed */
1795 case -ESHUTDOWN: /* device shut down */
1796 /* ignore silently */
1797 gig_dbg(DEBUG_USBREQ, "%s: %s",
1798 __func__, get_usb_statmsg(status));
1799 return;
1800 default: /* any failure */
1801 if (++ucs->retry_cmd_out > BAS_RETRY) {
1802 dev_warn(cs->dev,
1803 "command write: %s, "
1804 "giving up after %d retries\n",
1805 get_usb_statmsg(status),
1806 ucs->retry_cmd_out);
1807 break;
1808 }
1809 if (ucs->basstate & BS_SUSPEND) {
1810 dev_warn(cs->dev,
1811 "command write: %s, "
1812 "won't retry - suspend requested\n",
1813 get_usb_statmsg(status));
1814 break;
1815 }
1816 if (cs->cmdbuf == NULL) {
1817 dev_warn(cs->dev,
1818 "command write: %s, "
1819 "cannot retry - cmdbuf gone\n",
1820 get_usb_statmsg(status));
1821 break;
1822 }
1823 dev_notice(cs->dev, "command write: %s, retry %d\n",
1824 get_usb_statmsg(status), ucs->retry_cmd_out);
1825 if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
1826 /* resubmitted - bypass regular exit block */
1827 return;
1828 /* command send failed, assume base still waiting */
1829 update_basstate(ucs, BS_ATREADY, 0);
1830 }
1831
1832 spin_lock_irqsave(&cs->cmdlock, flags);
1833 if (cs->cmdbuf != NULL)
1834 complete_cb(cs);
1835 spin_unlock_irqrestore(&cs->cmdlock, flags);
1836 }
1837
1838 /* atrdy_timeout
1839 * timeout routine for AT command transmission
1840 * argument:
1841 * controller state structure
1842 */
1843 static void atrdy_timeout(struct timer_list *t)
1844 {
1845 struct bas_cardstate *ucs = from_timer(ucs, t, timer_atrdy);
1846 struct cardstate *cs = ucs->cs;
1847
1848 dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
1849
1850 /* fake the missing signal - what else can I do? */
1851 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
1852 start_cbsend(cs);
1853 }
1854
1855 /* atwrite_submit
1856 * submit an HD_WRITE_ATMESSAGE command URB
1857 * parameters:
1858 * cs controller state structure
1859 * buf buffer containing command to send
1860 * len length of command to send
1861 * return value:
1862 * 0 on success
1863 * -EBUSY if another request is pending
1864 * any URB submission error code
1865 */
1866 static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
1867 {
1868 struct bas_cardstate *ucs = cs->hw.bas;
1869 int rc;
1870
1871 gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1872
1873 if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
1874 dev_err(cs->dev,
1875 "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
1876 return -EBUSY;
1877 }
1878
1879 ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
1880 ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
1881 ucs->dr_cmd_out.wValue = 0;
1882 ucs->dr_cmd_out.wIndex = 0;
1883 ucs->dr_cmd_out.wLength = cpu_to_le16(len);
1884 usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
1885 usb_sndctrlpipe(ucs->udev, 0),
1886 (unsigned char *) &ucs->dr_cmd_out, buf, len,
1887 write_command_callback, cs);
1888 rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
1889 if (unlikely(rc)) {
1890 update_basstate(ucs, 0, BS_ATWRPEND);
1891 dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
1892 get_usb_rcmsg(rc));
1893 return rc;
1894 }
1895
1896 /* submitted successfully, start timeout if necessary */
1897 if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
1898 gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
1899 ATRDY_TIMEOUT);
1900 mod_timer(&ucs->timer_atrdy, jiffies + ATRDY_TIMEOUT * HZ / 10);
1901 }
1902 return 0;
1903 }
1904
1905 /* start_cbsend
1906 * start transmission of AT command queue if necessary
1907 * parameter:
1908 * cs controller state structure
1909 * return value:
1910 * 0 on success
1911 * error code < 0 on error
1912 */
1913 static int start_cbsend(struct cardstate *cs)
1914 {
1915 struct cmdbuf_t *cb;
1916 struct bas_cardstate *ucs = cs->hw.bas;
1917 unsigned long flags;
1918 int rc;
1919 int retval = 0;
1920
1921 /* check if suspend requested */
1922 if (ucs->basstate & BS_SUSPEND) {
1923 gig_dbg(DEBUG_OUTPUT, "suspending");
1924 return -EHOSTUNREACH;
1925 }
1926
1927 /* check if AT channel is open */
1928 if (!(ucs->basstate & BS_ATOPEN)) {
1929 gig_dbg(DEBUG_OUTPUT, "AT channel not open");
1930 rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
1931 if (rc < 0) {
1932 /* flush command queue */
1933 spin_lock_irqsave(&cs->cmdlock, flags);
1934 while (cs->cmdbuf != NULL)
1935 complete_cb(cs);
1936 spin_unlock_irqrestore(&cs->cmdlock, flags);
1937 }
1938 return rc;
1939 }
1940
1941 /* try to send first command in queue */
1942 spin_lock_irqsave(&cs->cmdlock, flags);
1943
1944 while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
1945 ucs->retry_cmd_out = 0;
1946 rc = atwrite_submit(cs, cb->buf, cb->len);
1947 if (unlikely(rc)) {
1948 retval = rc;
1949 complete_cb(cs);
1950 }
1951 }
1952
1953 spin_unlock_irqrestore(&cs->cmdlock, flags);
1954 return retval;
1955 }
1956
1957 /* gigaset_write_cmd
1958 * This function is called by the device independent part of the driver
1959 * to transmit an AT command string to the Gigaset device.
1960 * It encapsulates the device specific method for transmission over the
1961 * direct USB connection to the base.
1962 * The command string is added to the queue of commands to send, and
1963 * USB transmission is started if necessary.
1964 * parameters:
1965 * cs controller state structure
1966 * cb command buffer structure
1967 * return value:
1968 * number of bytes queued on success
1969 * error code < 0 on error
1970 */
1971 static int gigaset_write_cmd(struct cardstate *cs, struct cmdbuf_t *cb)
1972 {
1973 unsigned long flags;
1974 int rc;
1975
1976 gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
1977 DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1978 "CMD Transmit", cb->len, cb->buf);
1979
1980 /* translate "+++" escape sequence sent as a single separate command
1981 * into "close AT channel" command for error recovery
1982 * The next command will reopen the AT channel automatically.
1983 */
1984 if (cb->len == 3 && !memcmp(cb->buf, "+++", 3)) {
1985 /* If an HD_RECEIVEATDATA_ACK message remains unhandled
1986 * because of an error, the base never sends another one.
1987 * The response channel is thus effectively blocked.
1988 * Closing and reopening the AT channel does *not* clear
1989 * this condition.
1990 * As a stopgap measure, submit a zero-length AT read
1991 * before closing the AT channel. This has the undocumented
1992 * effect of triggering a new HD_RECEIVEATDATA_ACK message
1993 * from the base if necessary.
1994 * The subsequent AT channel close then discards any pending
1995 * messages.
1996 */
1997 spin_lock_irqsave(&cs->lock, flags);
1998 if (!(cs->hw.bas->basstate & BS_ATRDPEND)) {
1999 kfree(cs->hw.bas->rcvbuf);
2000 cs->hw.bas->rcvbuf = NULL;
2001 cs->hw.bas->rcvbuf_size = 0;
2002 cs->hw.bas->retry_cmd_in = 0;
2003 atread_submit(cs, 0);
2004 }
2005 spin_unlock_irqrestore(&cs->lock, flags);
2006
2007 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
2008 if (cb->wake_tasklet)
2009 tasklet_schedule(cb->wake_tasklet);
2010 if (!rc)
2011 rc = cb->len;
2012 kfree(cb);
2013 return rc;
2014 }
2015
2016 spin_lock_irqsave(&cs->cmdlock, flags);
2017 cb->prev = cs->lastcmdbuf;
2018 if (cs->lastcmdbuf)
2019 cs->lastcmdbuf->next = cb;
2020 else {
2021 cs->cmdbuf = cb;
2022 cs->curlen = cb->len;
2023 }
2024 cs->cmdbytes += cb->len;
2025 cs->lastcmdbuf = cb;
2026 spin_unlock_irqrestore(&cs->cmdlock, flags);
2027
2028 spin_lock_irqsave(&cs->lock, flags);
2029 if (unlikely(!cs->connected)) {
2030 spin_unlock_irqrestore(&cs->lock, flags);
2031 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
2032 /* flush command queue */
2033 spin_lock_irqsave(&cs->cmdlock, flags);
2034 while (cs->cmdbuf != NULL)
2035 complete_cb(cs);
2036 spin_unlock_irqrestore(&cs->cmdlock, flags);
2037 return -ENODEV;
2038 }
2039 rc = start_cbsend(cs);
2040 spin_unlock_irqrestore(&cs->lock, flags);
2041 return rc < 0 ? rc : cb->len;
2042 }
2043
2044 /* gigaset_write_room
2045 * tty_driver.write_room interface routine
2046 * return number of characters the driver will accept to be written via
2047 * gigaset_write_cmd
2048 * parameter:
2049 * controller state structure
2050 * return value:
2051 * number of characters
2052 */
2053 static int gigaset_write_room(struct cardstate *cs)
2054 {
2055 return IF_WRITEBUF;
2056 }
2057
2058 /* gigaset_chars_in_buffer
2059 * tty_driver.chars_in_buffer interface routine
2060 * return number of characters waiting to be sent
2061 * parameter:
2062 * controller state structure
2063 * return value:
2064 * number of characters
2065 */
2066 static int gigaset_chars_in_buffer(struct cardstate *cs)
2067 {
2068 return cs->cmdbytes;
2069 }
2070
2071 /* gigaset_brkchars
2072 * implementation of ioctl(GIGASET_BRKCHARS)
2073 * parameter:
2074 * controller state structure
2075 * return value:
2076 * -EINVAL (unimplemented function)
2077 */
2078 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
2079 {
2080 return -EINVAL;
2081 }
2082
2083
2084 /* Device Initialization/Shutdown */
2085 /* ============================== */
2086
2087 /* Free hardware dependent part of the B channel structure
2088 * parameter:
2089 * bcs B channel structure
2090 */
2091 static void gigaset_freebcshw(struct bc_state *bcs)
2092 {
2093 struct bas_bc_state *ubc = bcs->hw.bas;
2094 int i;
2095
2096 if (!ubc)
2097 return;
2098
2099 /* kill URBs and tasklets before freeing - better safe than sorry */
2100 ubc->running = 0;
2101 gig_dbg(DEBUG_INIT, "%s: killing isoc URBs", __func__);
2102 for (i = 0; i < BAS_OUTURBS; ++i) {
2103 usb_kill_urb(ubc->isoouturbs[i].urb);
2104 usb_free_urb(ubc->isoouturbs[i].urb);
2105 }
2106 for (i = 0; i < BAS_INURBS; ++i) {
2107 usb_kill_urb(ubc->isoinurbs[i]);
2108 usb_free_urb(ubc->isoinurbs[i]);
2109 }
2110 tasklet_kill(&ubc->sent_tasklet);
2111 tasklet_kill(&ubc->rcvd_tasklet);
2112 kfree(ubc->isooutbuf);
2113 kfree(ubc);
2114 bcs->hw.bas = NULL;
2115 }
2116
2117 /* Initialize hardware dependent part of the B channel structure
2118 * parameter:
2119 * bcs B channel structure
2120 * return value:
2121 * 0 on success, error code < 0 on failure
2122 */
2123 static int gigaset_initbcshw(struct bc_state *bcs)
2124 {
2125 int i;
2126 struct bas_bc_state *ubc;
2127
2128 bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
2129 if (!ubc) {
2130 pr_err("out of memory\n");
2131 return -ENOMEM;
2132 }
2133
2134 ubc->running = 0;
2135 atomic_set(&ubc->corrbytes, 0);
2136 spin_lock_init(&ubc->isooutlock);
2137 for (i = 0; i < BAS_OUTURBS; ++i) {
2138 ubc->isoouturbs[i].urb = NULL;
2139 ubc->isoouturbs[i].bcs = bcs;
2140 }
2141 ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
2142 ubc->numsub = 0;
2143 ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL);
2144 if (!ubc->isooutbuf) {
2145 pr_err("out of memory\n");
2146 kfree(ubc);
2147 bcs->hw.bas = NULL;
2148 return -ENOMEM;
2149 }
2150 tasklet_init(&ubc->sent_tasklet,
2151 write_iso_tasklet, (unsigned long) bcs);
2152
2153 spin_lock_init(&ubc->isoinlock);
2154 for (i = 0; i < BAS_INURBS; ++i)
2155 ubc->isoinurbs[i] = NULL;
2156 ubc->isoindone = NULL;
2157 ubc->loststatus = -EINPROGRESS;
2158 ubc->isoinlost = 0;
2159 ubc->seqlen = 0;
2160 ubc->inbyte = 0;
2161 ubc->inbits = 0;
2162 ubc->goodbytes = 0;
2163 ubc->alignerrs = 0;
2164 ubc->fcserrs = 0;
2165 ubc->frameerrs = 0;
2166 ubc->giants = 0;
2167 ubc->runts = 0;
2168 ubc->aborts = 0;
2169 ubc->shared0s = 0;
2170 ubc->stolen0s = 0;
2171 tasklet_init(&ubc->rcvd_tasklet,
2172 read_iso_tasklet, (unsigned long) bcs);
2173 return 0;
2174 }
2175
2176 static void gigaset_reinitbcshw(struct bc_state *bcs)
2177 {
2178 struct bas_bc_state *ubc = bcs->hw.bas;
2179
2180 bcs->hw.bas->running = 0;
2181 atomic_set(&bcs->hw.bas->corrbytes, 0);
2182 bcs->hw.bas->numsub = 0;
2183 spin_lock_init(&ubc->isooutlock);
2184 spin_lock_init(&ubc->isoinlock);
2185 ubc->loststatus = -EINPROGRESS;
2186 }
2187
2188 static void gigaset_freecshw(struct cardstate *cs)
2189 {
2190 /* timers, URBs and rcvbuf are disposed of in disconnect */
2191 kfree(cs->hw.bas->int_in_buf);
2192 kfree(cs->hw.bas);
2193 cs->hw.bas = NULL;
2194 }
2195
2196 /* Initialize hardware dependent part of the cardstate structure
2197 * parameter:
2198 * cs cardstate structure
2199 * return value:
2200 * 0 on success, error code < 0 on failure
2201 */
2202 static int gigaset_initcshw(struct cardstate *cs)
2203 {
2204 struct bas_cardstate *ucs;
2205
2206 cs->hw.bas = ucs = kzalloc(sizeof(*ucs), GFP_KERNEL);
2207 if (!ucs) {
2208 pr_err("out of memory\n");
2209 return -ENOMEM;
2210 }
2211 ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
2212 if (!ucs->int_in_buf) {
2213 kfree(ucs);
2214 pr_err("out of memory\n");
2215 return -ENOMEM;
2216 }
2217
2218 spin_lock_init(&ucs->lock);
2219 ucs->cs = cs;
2220 timer_setup(&ucs->timer_ctrl, req_timeout, 0);
2221 timer_setup(&ucs->timer_atrdy, atrdy_timeout, 0);
2222 timer_setup(&ucs->timer_cmd_in, cmd_in_timeout, 0);
2223 timer_setup(&ucs->timer_int_in, int_in_resubmit, 0);
2224 init_waitqueue_head(&ucs->waitqueue);
2225 INIT_WORK(&ucs->int_in_wq, int_in_work);
2226
2227 return 0;
2228 }
2229
2230 /* freeurbs
2231 * unlink and deallocate all URBs unconditionally
2232 * caller must make sure that no commands are still in progress
2233 * parameter:
2234 * cs controller state structure
2235 */
2236 static void freeurbs(struct cardstate *cs)
2237 {
2238 struct bas_cardstate *ucs = cs->hw.bas;
2239 struct bas_bc_state *ubc;
2240 int i, j;
2241
2242 gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
2243 for (j = 0; j < BAS_CHANNELS; ++j) {
2244 ubc = cs->bcs[j].hw.bas;
2245 for (i = 0; i < BAS_OUTURBS; ++i) {
2246 usb_kill_urb(ubc->isoouturbs[i].urb);
2247 usb_free_urb(ubc->isoouturbs[i].urb);
2248 ubc->isoouturbs[i].urb = NULL;
2249 }
2250 for (i = 0; i < BAS_INURBS; ++i) {
2251 usb_kill_urb(ubc->isoinurbs[i]);
2252 usb_free_urb(ubc->isoinurbs[i]);
2253 ubc->isoinurbs[i] = NULL;
2254 }
2255 }
2256 usb_kill_urb(ucs->urb_int_in);
2257 usb_free_urb(ucs->urb_int_in);
2258 ucs->urb_int_in = NULL;
2259 usb_kill_urb(ucs->urb_cmd_out);
2260 usb_free_urb(ucs->urb_cmd_out);
2261 ucs->urb_cmd_out = NULL;
2262 usb_kill_urb(ucs->urb_cmd_in);
2263 usb_free_urb(ucs->urb_cmd_in);
2264 ucs->urb_cmd_in = NULL;
2265 usb_kill_urb(ucs->urb_ctrl);
2266 usb_free_urb(ucs->urb_ctrl);
2267 ucs->urb_ctrl = NULL;
2268 }
2269
2270 /* gigaset_probe
2271 * This function is called when a new USB device is connected.
2272 * It checks whether the new device is handled by this driver.
2273 */
2274 static int gigaset_probe(struct usb_interface *interface,
2275 const struct usb_device_id *id)
2276 {
2277 struct usb_host_interface *hostif;
2278 struct usb_device *udev = interface_to_usbdev(interface);
2279 struct cardstate *cs = NULL;
2280 struct bas_cardstate *ucs = NULL;
2281 struct bas_bc_state *ubc;
2282 struct usb_endpoint_descriptor *endpoint;
2283 int i, j;
2284 int rc;
2285
2286 gig_dbg(DEBUG_INIT,
2287 "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
2288 __func__, le16_to_cpu(udev->descriptor.idVendor),
2289 le16_to_cpu(udev->descriptor.idProduct));
2290
2291 /* set required alternate setting */
2292 hostif = interface->cur_altsetting;
2293 if (hostif->desc.bAlternateSetting != 3) {
2294 gig_dbg(DEBUG_INIT,
2295 "%s: wrong alternate setting %d - trying to switch",
2296 __func__, hostif->desc.bAlternateSetting);
2297 if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3)
2298 < 0) {
2299 dev_warn(&udev->dev, "usb_set_interface failed, "
2300 "device %d interface %d altsetting %d\n",
2301 udev->devnum, hostif->desc.bInterfaceNumber,
2302 hostif->desc.bAlternateSetting);
2303 return -ENODEV;
2304 }
2305 hostif = interface->cur_altsetting;
2306 }
2307
2308 /* Reject application specific interfaces
2309 */
2310 if (hostif->desc.bInterfaceClass != 255) {
2311 dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
2312 __func__, hostif->desc.bInterfaceClass);
2313 return -ENODEV;
2314 }
2315
2316 if (hostif->desc.bNumEndpoints < 1)
2317 return -ENODEV;
2318
2319 dev_info(&udev->dev,
2320 "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
2321 __func__, le16_to_cpu(udev->descriptor.idVendor),
2322 le16_to_cpu(udev->descriptor.idProduct));
2323
2324 /* allocate memory for our device state and initialize it */
2325 cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
2326 GIGASET_MODULENAME);
2327 if (!cs)
2328 return -ENODEV;
2329 ucs = cs->hw.bas;
2330
2331 /* save off device structure ptrs for later use */
2332 usb_get_dev(udev);
2333 ucs->udev = udev;
2334 ucs->interface = interface;
2335 cs->dev = &interface->dev;
2336
2337 /* allocate URBs:
2338 * - one for the interrupt pipe
2339 * - three for the different uses of the default control pipe
2340 * - three for each isochronous pipe
2341 */
2342 if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2343 !(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2344 !(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
2345 !(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
2346 goto allocerr;
2347
2348 for (j = 0; j < BAS_CHANNELS; ++j) {
2349 ubc = cs->bcs[j].hw.bas;
2350 for (i = 0; i < BAS_OUTURBS; ++i)
2351 if (!(ubc->isoouturbs[i].urb =
2352 usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2353 goto allocerr;
2354 for (i = 0; i < BAS_INURBS; ++i)
2355 if (!(ubc->isoinurbs[i] =
2356 usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2357 goto allocerr;
2358 }
2359
2360 ucs->rcvbuf = NULL;
2361 ucs->rcvbuf_size = 0;
2362
2363 /* Fill the interrupt urb and send it to the core */
2364 endpoint = &hostif->endpoint[0].desc;
2365 usb_fill_int_urb(ucs->urb_int_in, udev,
2366 usb_rcvintpipe(udev,
2367 usb_endpoint_num(endpoint)),
2368 ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
2369 endpoint->bInterval);
2370 rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2371 if (rc != 0) {
2372 dev_err(cs->dev, "could not submit interrupt URB: %s\n",
2373 get_usb_rcmsg(rc));
2374 goto error;
2375 }
2376 ucs->retry_int_in = 0;
2377
2378 /* tell the device that the driver is ready */
2379 rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0);
2380 if (rc != 0)
2381 goto error;
2382
2383 /* tell common part that the device is ready */
2384 if (startmode == SM_LOCKED)
2385 cs->mstate = MS_LOCKED;
2386
2387 /* save address of controller structure */
2388 usb_set_intfdata(interface, cs);
2389
2390 rc = gigaset_start(cs);
2391 if (rc < 0)
2392 goto error;
2393
2394 return 0;
2395
2396 allocerr:
2397 dev_err(cs->dev, "could not allocate URBs\n");
2398 rc = -ENOMEM;
2399 error:
2400 freeurbs(cs);
2401 usb_set_intfdata(interface, NULL);
2402 usb_put_dev(udev);
2403 gigaset_freecs(cs);
2404 return rc;
2405 }
2406
2407 /* gigaset_disconnect
2408 * This function is called when the Gigaset base is unplugged.
2409 */
2410 static void gigaset_disconnect(struct usb_interface *interface)
2411 {
2412 struct cardstate *cs;
2413 struct bas_cardstate *ucs;
2414 int j;
2415
2416 cs = usb_get_intfdata(interface);
2417
2418 ucs = cs->hw.bas;
2419
2420 dev_info(cs->dev, "disconnecting Gigaset base\n");
2421
2422 /* mark base as not ready, all channels disconnected */
2423 ucs->basstate = 0;
2424
2425 /* tell LL all channels are down */
2426 for (j = 0; j < BAS_CHANNELS; ++j)
2427 gigaset_bchannel_down(cs->bcs + j);
2428
2429 /* stop driver (common part) */
2430 gigaset_stop(cs);
2431
2432 /* stop delayed work and URBs, free ressources */
2433 del_timer_sync(&ucs->timer_ctrl);
2434 del_timer_sync(&ucs->timer_atrdy);
2435 del_timer_sync(&ucs->timer_cmd_in);
2436 del_timer_sync(&ucs->timer_int_in);
2437 cancel_work_sync(&ucs->int_in_wq);
2438 freeurbs(cs);
2439 usb_set_intfdata(interface, NULL);
2440 kfree(ucs->rcvbuf);
2441 ucs->rcvbuf = NULL;
2442 ucs->rcvbuf_size = 0;
2443 usb_put_dev(ucs->udev);
2444 ucs->interface = NULL;
2445 ucs->udev = NULL;
2446 cs->dev = NULL;
2447 gigaset_freecs(cs);
2448 }
2449
2450 /* gigaset_suspend
2451 * This function is called before the USB connection is suspended
2452 * or before the USB device is reset.
2453 * In the latter case, message == PMSG_ON.
2454 */
2455 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
2456 {
2457 struct cardstate *cs = usb_get_intfdata(intf);
2458 struct bas_cardstate *ucs = cs->hw.bas;
2459 int rc;
2460
2461 /* set suspend flag; this stops AT command/response traffic */
2462 if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
2463 gig_dbg(DEBUG_SUSPEND, "already suspended");
2464 return 0;
2465 }
2466
2467 /* wait a bit for blocking conditions to go away */
2468 rc = wait_event_timeout(ucs->waitqueue,
2469 !(ucs->basstate &
2470 (BS_B1OPEN | BS_B2OPEN | BS_ATRDPEND | BS_ATWRPEND)),
2471 BAS_TIMEOUT * HZ / 10);
2472 gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
2473
2474 /* check for conditions preventing suspend */
2475 if (ucs->basstate & (BS_B1OPEN | BS_B2OPEN | BS_ATRDPEND | BS_ATWRPEND)) {
2476 dev_warn(cs->dev, "cannot suspend:\n");
2477 if (ucs->basstate & BS_B1OPEN)
2478 dev_warn(cs->dev, " B channel 1 open\n");
2479 if (ucs->basstate & BS_B2OPEN)
2480 dev_warn(cs->dev, " B channel 2 open\n");
2481 if (ucs->basstate & BS_ATRDPEND)
2482 dev_warn(cs->dev, " receiving AT reply\n");
2483 if (ucs->basstate & BS_ATWRPEND)
2484 dev_warn(cs->dev, " sending AT command\n");
2485 update_basstate(ucs, 0, BS_SUSPEND);
2486 return -EBUSY;
2487 }
2488
2489 /* close AT channel if open */
2490 if (ucs->basstate & BS_ATOPEN) {
2491 gig_dbg(DEBUG_SUSPEND, "closing AT channel");
2492 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
2493 if (rc) {
2494 update_basstate(ucs, 0, BS_SUSPEND);
2495 return rc;
2496 }
2497 wait_event_timeout(ucs->waitqueue, !ucs->pending,
2498 BAS_TIMEOUT * HZ / 10);
2499 /* in case of timeout, proceed anyway */
2500 }
2501
2502 /* kill all URBs and delayed work that might still be pending */
2503 usb_kill_urb(ucs->urb_ctrl);
2504 usb_kill_urb(ucs->urb_int_in);
2505 del_timer_sync(&ucs->timer_ctrl);
2506 del_timer_sync(&ucs->timer_atrdy);
2507 del_timer_sync(&ucs->timer_cmd_in);
2508 del_timer_sync(&ucs->timer_int_in);
2509
2510 /* don't try to cancel int_in_wq from within reset as it
2511 * might be the one requesting the reset
2512 */
2513 if (message.event != PM_EVENT_ON)
2514 cancel_work_sync(&ucs->int_in_wq);
2515
2516 gig_dbg(DEBUG_SUSPEND, "suspend complete");
2517 return 0;
2518 }
2519
2520 /* gigaset_resume
2521 * This function is called after the USB connection has been resumed.
2522 */
2523 static int gigaset_resume(struct usb_interface *intf)
2524 {
2525 struct cardstate *cs = usb_get_intfdata(intf);
2526 struct bas_cardstate *ucs = cs->hw.bas;
2527 int rc;
2528
2529 /* resubmit interrupt URB for spontaneous messages from base */
2530 rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2531 if (rc) {
2532 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
2533 get_usb_rcmsg(rc));
2534 return rc;
2535 }
2536 ucs->retry_int_in = 0;
2537
2538 /* clear suspend flag to reallow activity */
2539 update_basstate(ucs, 0, BS_SUSPEND);
2540
2541 gig_dbg(DEBUG_SUSPEND, "resume complete");
2542 return 0;
2543 }
2544
2545 /* gigaset_pre_reset
2546 * This function is called before the USB connection is reset.
2547 */
2548 static int gigaset_pre_reset(struct usb_interface *intf)
2549 {
2550 /* handle just like suspend */
2551 return gigaset_suspend(intf, PMSG_ON);
2552 }
2553
2554 /* gigaset_post_reset
2555 * This function is called after the USB connection has been reset.
2556 */
2557 static int gigaset_post_reset(struct usb_interface *intf)
2558 {
2559 /* FIXME: send HD_DEVICE_INIT_ACK? */
2560
2561 /* resume operations */
2562 return gigaset_resume(intf);
2563 }
2564
2565
2566 static const struct gigaset_ops gigops = {
2567 .write_cmd = gigaset_write_cmd,
2568 .write_room = gigaset_write_room,
2569 .chars_in_buffer = gigaset_chars_in_buffer,
2570 .brkchars = gigaset_brkchars,
2571 .init_bchannel = gigaset_init_bchannel,
2572 .close_bchannel = gigaset_close_bchannel,
2573 .initbcshw = gigaset_initbcshw,
2574 .freebcshw = gigaset_freebcshw,
2575 .reinitbcshw = gigaset_reinitbcshw,
2576 .initcshw = gigaset_initcshw,
2577 .freecshw = gigaset_freecshw,
2578 .set_modem_ctrl = gigaset_set_modem_ctrl,
2579 .baud_rate = gigaset_baud_rate,
2580 .set_line_ctrl = gigaset_set_line_ctrl,
2581 .send_skb = gigaset_isoc_send_skb,
2582 .handle_input = gigaset_isoc_input,
2583 };
2584
2585 /* bas_gigaset_init
2586 * This function is called after the kernel module is loaded.
2587 */
2588 static int __init bas_gigaset_init(void)
2589 {
2590 int result;
2591
2592 /* allocate memory for our driver state and initialize it */
2593 driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2594 GIGASET_MODULENAME, GIGASET_DEVNAME,
2595 &gigops, THIS_MODULE);
2596 if (driver == NULL)
2597 goto error;
2598
2599 /* register this driver with the USB subsystem */
2600 result = usb_register(&gigaset_usb_driver);
2601 if (result < 0) {
2602 pr_err("error %d registering USB driver\n", -result);
2603 goto error;
2604 }
2605
2606 pr_info(DRIVER_DESC "\n");
2607 return 0;
2608
2609 error:
2610 if (driver)
2611 gigaset_freedriver(driver);
2612 driver = NULL;
2613 return -1;
2614 }
2615
2616 /* bas_gigaset_exit
2617 * This function is called before the kernel module is unloaded.
2618 */
2619 static void __exit bas_gigaset_exit(void)
2620 {
2621 struct bas_cardstate *ucs;
2622 int i;
2623
2624 gigaset_blockdriver(driver); /* => probe will fail
2625 * => no gigaset_start any more
2626 */
2627
2628 /* stop all connected devices */
2629 for (i = 0; i < driver->minors; i++) {
2630 if (gigaset_shutdown(driver->cs + i) < 0)
2631 continue; /* no device */
2632 /* from now on, no isdn callback should be possible */
2633
2634 /* close all still open channels */
2635 ucs = driver->cs[i].hw.bas;
2636 if (ucs->basstate & BS_B1OPEN) {
2637 gig_dbg(DEBUG_INIT, "closing B1 channel");
2638 usb_control_msg(ucs->udev,
2639 usb_sndctrlpipe(ucs->udev, 0),
2640 HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
2641 0, 0, NULL, 0, BAS_TIMEOUT);
2642 }
2643 if (ucs->basstate & BS_B2OPEN) {
2644 gig_dbg(DEBUG_INIT, "closing B2 channel");
2645 usb_control_msg(ucs->udev,
2646 usb_sndctrlpipe(ucs->udev, 0),
2647 HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
2648 0, 0, NULL, 0, BAS_TIMEOUT);
2649 }
2650 if (ucs->basstate & BS_ATOPEN) {
2651 gig_dbg(DEBUG_INIT, "closing AT channel");
2652 usb_control_msg(ucs->udev,
2653 usb_sndctrlpipe(ucs->udev, 0),
2654 HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
2655 0, 0, NULL, 0, BAS_TIMEOUT);
2656 }
2657 ucs->basstate = 0;
2658 }
2659
2660 /* deregister this driver with the USB subsystem */
2661 usb_deregister(&gigaset_usb_driver);
2662 /* this will call the disconnect-callback */
2663 /* from now on, no disconnect/probe callback should be running */
2664
2665 gigaset_freedriver(driver);
2666 driver = NULL;
2667 }
2668
2669
2670 module_init(bas_gigaset_init);
2671 module_exit(bas_gigaset_exit);
2672
2673 MODULE_AUTHOR(DRIVER_AUTHOR);
2674 MODULE_DESCRIPTION(DRIVER_DESC);
2675 MODULE_LICENSE("GPL");
Linux with added FPC-III support