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x86, acpi/irq: pci device dev->irq is an isa irq not a gsi
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / drivers / isdn / gigaset / bas-gigaset.c
blob47a5ffec55a393173de8fd01ef8019b2d7115bdd
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 usb_interface *interface; /* interface for this device */
93 unsigned char minor; /* starting minor number */
94
95 struct urb *urb_ctrl; /* control pipe default URB */
96 struct usb_ctrlrequest dr_ctrl;
97 struct timer_list timer_ctrl; /* control request timeout */
98 int retry_ctrl;
99
100 struct timer_list timer_atrdy; /* AT command ready timeout */
101 struct urb *urb_cmd_out; /* for sending AT commands */
102 struct usb_ctrlrequest dr_cmd_out;
103 int retry_cmd_out;
104
105 struct urb *urb_cmd_in; /* for receiving AT replies */
106 struct usb_ctrlrequest dr_cmd_in;
107 struct timer_list timer_cmd_in; /* receive request timeout */
108 unsigned char *rcvbuf; /* AT reply receive buffer */
109
110 struct urb *urb_int_in; /* URB for interrupt pipe */
111 unsigned char *int_in_buf;
112
113 spinlock_t lock; /* locks all following */
114 int basstate; /* bitmap (BS_*) */
115 int pending; /* uncompleted base request */
116 wait_queue_head_t waitqueue;
117 int rcvbuf_size; /* size of AT receive buffer */
118 /* 0: no receive in progress */
119 int retry_cmd_in; /* receive req retry count */
120 };
121
122 /* status of direct USB connection to 307x base (bits in basstate) */
123 #define BS_ATOPEN 0x001 /* AT channel open */
124 #define BS_B1OPEN 0x002 /* B channel 1 open */
125 #define BS_B2OPEN 0x004 /* B channel 2 open */
126 #define BS_ATREADY 0x008 /* base ready for AT command */
127 #define BS_INIT 0x010 /* base has signalled INIT_OK */
128 #define BS_ATTIMER 0x020 /* waiting for HD_READY_SEND_ATDATA */
129 #define BS_ATRDPEND 0x040 /* urb_cmd_in in use */
130 #define BS_ATWRPEND 0x080 /* urb_cmd_out in use */
131 #define BS_SUSPEND 0x100 /* USB port suspended */
132 #define BS_RESETTING 0x200 /* waiting for HD_RESET_INTERRUPT_PIPE_ACK */
133
134
135 static struct gigaset_driver *driver;
136
137 /* usb specific object needed to register this driver with the usb subsystem */
138 static struct usb_driver gigaset_usb_driver = {
139 .name = GIGASET_MODULENAME,
140 .probe = gigaset_probe,
141 .disconnect = gigaset_disconnect,
142 .id_table = gigaset_table,
143 .suspend = gigaset_suspend,
144 .resume = gigaset_resume,
145 .reset_resume = gigaset_post_reset,
146 .pre_reset = gigaset_pre_reset,
147 .post_reset = gigaset_post_reset,
148 };
149
150 /* get message text for usb_submit_urb return code
151 */
152 static char *get_usb_rcmsg(int rc)
153 {
154 static char unkmsg[28];
155
156 switch (rc) {
157 case 0:
158 return "success";
159 case -ENOMEM:
160 return "out of memory";
161 case -ENODEV:
162 return "device not present";
163 case -ENOENT:
164 return "endpoint not present";
165 case -ENXIO:
166 return "URB type not supported";
167 case -EINVAL:
168 return "invalid argument";
169 case -EAGAIN:
170 return "start frame too early or too much scheduled";
171 case -EFBIG:
172 return "too many isochronous frames requested";
173 case -EPIPE:
174 return "endpoint stalled";
175 case -EMSGSIZE:
176 return "invalid packet size";
177 case -ENOSPC:
178 return "would overcommit USB bandwidth";
179 case -ESHUTDOWN:
180 return "device shut down";
181 case -EPERM:
182 return "reject flag set";
183 case -EHOSTUNREACH:
184 return "device suspended";
185 default:
186 snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
187 return unkmsg;
188 }
189 }
190
191 /* get message text for USB status code
192 */
193 static char *get_usb_statmsg(int status)
194 {
195 static char unkmsg[28];
196
197 switch (status) {
198 case 0:
199 return "success";
200 case -ENOENT:
201 return "unlinked (sync)";
202 case -EINPROGRESS:
203 return "pending";
204 case -EPROTO:
205 return "bit stuffing error, timeout, or unknown USB error";
206 case -EILSEQ:
207 return "CRC mismatch, timeout, or unknown USB error";
208 case -ETIME:
209 return "timed out";
210 case -EPIPE:
211 return "endpoint stalled";
212 case -ECOMM:
213 return "IN buffer overrun";
214 case -ENOSR:
215 return "OUT buffer underrun";
216 case -EOVERFLOW:
217 return "too much data";
218 case -EREMOTEIO:
219 return "short packet detected";
220 case -ENODEV:
221 return "device removed";
222 case -EXDEV:
223 return "partial isochronous transfer";
224 case -EINVAL:
225 return "invalid argument";
226 case -ECONNRESET:
227 return "unlinked (async)";
228 case -ESHUTDOWN:
229 return "device shut down";
230 default:
231 snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
232 return unkmsg;
233 }
234 }
235
236 /* usb_pipetype_str
237 * retrieve string representation of USB pipe type
238 */
239 static inline char *usb_pipetype_str(int pipe)
240 {
241 if (usb_pipeisoc(pipe))
242 return "Isoc";
243 if (usb_pipeint(pipe))
244 return "Int";
245 if (usb_pipecontrol(pipe))
246 return "Ctrl";
247 if (usb_pipebulk(pipe))
248 return "Bulk";
249 return "?";
250 }
251
252 /* dump_urb
253 * write content of URB to syslog for debugging
254 */
255 static inline void dump_urb(enum debuglevel level, const char *tag,
256 struct urb *urb)
257 {
258 #ifdef CONFIG_GIGASET_DEBUG
259 int i;
260 gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
261 if (urb) {
262 gig_dbg(level,
263 " dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
264 "hcpriv=0x%08lx, transfer_flags=0x%x,",
265 (unsigned long) urb->dev,
266 usb_pipetype_str(urb->pipe),
267 usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
268 usb_pipein(urb->pipe) ? "in" : "out",
269 (unsigned long) urb->hcpriv,
270 urb->transfer_flags);
271 gig_dbg(level,
272 " transfer_buffer=0x%08lx[%d], actual_length=%d, "
273 "setup_packet=0x%08lx,",
274 (unsigned long) urb->transfer_buffer,
275 urb->transfer_buffer_length, urb->actual_length,
276 (unsigned long) urb->setup_packet);
277 gig_dbg(level,
278 " start_frame=%d, number_of_packets=%d, interval=%d, "
279 "error_count=%d,",
280 urb->start_frame, urb->number_of_packets, urb->interval,
281 urb->error_count);
282 gig_dbg(level,
283 " context=0x%08lx, complete=0x%08lx, "
284 "iso_frame_desc[]={",
285 (unsigned long) urb->context,
286 (unsigned long) urb->complete);
287 for (i = 0; i < urb->number_of_packets; i++) {
288 struct usb_iso_packet_descriptor *pifd
289 = &urb->iso_frame_desc[i];
290 gig_dbg(level,
291 " {offset=%u, length=%u, actual_length=%u, "
292 "status=%u}",
293 pifd->offset, pifd->length, pifd->actual_length,
294 pifd->status);
295 }
296 }
297 gig_dbg(level, "}}");
298 #endif
299 }
300
301 /* read/set modem control bits etc. (m10x only) */
302 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
303 unsigned new_state)
304 {
305 return -EINVAL;
306 }
307
308 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
309 {
310 return -EINVAL;
311 }
312
313 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
314 {
315 return -EINVAL;
316 }
317
318 /* set/clear bits in base connection state, return previous state
319 */
320 static inline int update_basstate(struct bas_cardstate *ucs,
321 int set, int clear)
322 {
323 unsigned long flags;
324 int state;
325
326 spin_lock_irqsave(&ucs->lock, flags);
327 state = ucs->basstate;
328 ucs->basstate = (state & ~clear) | set;
329 spin_unlock_irqrestore(&ucs->lock, flags);
330 return state;
331 }
332
333 /* error_hangup
334 * hang up any existing connection because of an unrecoverable error
335 * This function may be called from any context and takes care of scheduling
336 * the necessary actions for execution outside of interrupt context.
337 * cs->lock must not be held.
338 * argument:
339 * B channel control structure
340 */
341 static inline void error_hangup(struct bc_state *bcs)
342 {
343 struct cardstate *cs = bcs->cs;
344
345 gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL);
346 gigaset_schedule_event(cs);
347 }
348
349 /* error_reset
350 * reset Gigaset device because of an unrecoverable error
351 * This function may be called from any context, and takes care of
352 * scheduling the necessary actions for execution outside of interrupt context.
353 * cs->lock must not be held.
354 * argument:
355 * controller state structure
356 */
357 static inline void error_reset(struct cardstate *cs)
358 {
359 /* reset interrupt pipe to recover (ignore errors) */
360 update_basstate(cs->hw.bas, BS_RESETTING, 0);
361 req_submit(cs->bcs, HD_RESET_INTERRUPT_PIPE, 0, BAS_TIMEOUT);
362 }
363
364 /* check_pending
365 * check for completion of pending control request
366 * parameter:
367 * ucs hardware specific controller state structure
368 */
369 static void check_pending(struct bas_cardstate *ucs)
370 {
371 unsigned long flags;
372
373 spin_lock_irqsave(&ucs->lock, flags);
374 switch (ucs->pending) {
375 case 0:
376 break;
377 case HD_OPEN_ATCHANNEL:
378 if (ucs->basstate & BS_ATOPEN)
379 ucs->pending = 0;
380 break;
381 case HD_OPEN_B1CHANNEL:
382 if (ucs->basstate & BS_B1OPEN)
383 ucs->pending = 0;
384 break;
385 case HD_OPEN_B2CHANNEL:
386 if (ucs->basstate & BS_B2OPEN)
387 ucs->pending = 0;
388 break;
389 case HD_CLOSE_ATCHANNEL:
390 if (!(ucs->basstate & BS_ATOPEN))
391 ucs->pending = 0;
392 break;
393 case HD_CLOSE_B1CHANNEL:
394 if (!(ucs->basstate & BS_B1OPEN))
395 ucs->pending = 0;
396 break;
397 case HD_CLOSE_B2CHANNEL:
398 if (!(ucs->basstate & BS_B2OPEN))
399 ucs->pending = 0;
400 break;
401 case HD_DEVICE_INIT_ACK: /* no reply expected */
402 ucs->pending = 0;
403 break;
404 case HD_RESET_INTERRUPT_PIPE:
405 if (!(ucs->basstate & BS_RESETTING))
406 ucs->pending = 0;
407 break;
408 /*
409 * HD_READ_ATMESSAGE and HD_WRITE_ATMESSAGE are handled separately
410 * and should never end up here
411 */
412 default:
413 dev_warn(&ucs->interface->dev,
414 "unknown pending request 0x%02x cleared\n",
415 ucs->pending);
416 ucs->pending = 0;
417 }
418
419 if (!ucs->pending)
420 del_timer(&ucs->timer_ctrl);
421
422 spin_unlock_irqrestore(&ucs->lock, flags);
423 }
424
425 /* cmd_in_timeout
426 * timeout routine for command input request
427 * argument:
428 * controller state structure
429 */
430 static void cmd_in_timeout(unsigned long data)
431 {
432 struct cardstate *cs = (struct cardstate *) data;
433 struct bas_cardstate *ucs = cs->hw.bas;
434 int rc;
435
436 if (!ucs->rcvbuf_size) {
437 gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
438 return;
439 }
440
441 if (ucs->retry_cmd_in++ < BAS_RETRY) {
442 dev_notice(cs->dev, "control read: timeout, retry %d\n",
443 ucs->retry_cmd_in);
444 rc = atread_submit(cs, BAS_TIMEOUT);
445 if (rc >= 0 || rc == -ENODEV)
446 /* resubmitted or disconnected */
447 /* - bypass regular exit block */
448 return;
449 } else {
450 dev_err(cs->dev,
451 "control read: timeout, giving up after %d tries\n",
452 ucs->retry_cmd_in);
453 }
454 kfree(ucs->rcvbuf);
455 ucs->rcvbuf = NULL;
456 ucs->rcvbuf_size = 0;
457 error_reset(cs);
458 }
459
460 /* read_ctrl_callback
461 * USB completion handler for control pipe input
462 * called by the USB subsystem in interrupt context
463 * parameter:
464 * urb USB request block
465 * urb->context = inbuf structure for controller state
466 */
467 static void read_ctrl_callback(struct urb *urb)
468 {
469 struct inbuf_t *inbuf = urb->context;
470 struct cardstate *cs = inbuf->cs;
471 struct bas_cardstate *ucs = cs->hw.bas;
472 int status = urb->status;
473 int have_data = 0;
474 unsigned numbytes;
475 int rc;
476
477 update_basstate(ucs, 0, BS_ATRDPEND);
478 wake_up(&ucs->waitqueue);
479
480 if (!ucs->rcvbuf_size) {
481 dev_warn(cs->dev, "%s: no receive in progress\n", __func__);
482 return;
483 }
484
485 del_timer(&ucs->timer_cmd_in);
486
487 switch (status) {
488 case 0: /* normal completion */
489 numbytes = urb->actual_length;
490 if (unlikely(numbytes != ucs->rcvbuf_size)) {
491 dev_warn(cs->dev,
492 "control read: received %d chars, expected %d\n",
493 numbytes, ucs->rcvbuf_size);
494 if (numbytes > ucs->rcvbuf_size)
495 numbytes = ucs->rcvbuf_size;
496 }
497
498 /* copy received bytes to inbuf */
499 have_data = gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes);
500
501 if (unlikely(numbytes < ucs->rcvbuf_size)) {
502 /* incomplete - resubmit for remaining bytes */
503 ucs->rcvbuf_size -= numbytes;
504 ucs->retry_cmd_in = 0;
505 rc = atread_submit(cs, BAS_TIMEOUT);
506 if (rc >= 0 || rc == -ENODEV)
507 /* resubmitted or disconnected */
508 /* - bypass regular exit block */
509 return;
510 error_reset(cs);
511 }
512 break;
513
514 case -ENOENT: /* cancelled */
515 case -ECONNRESET: /* cancelled (async) */
516 case -EINPROGRESS: /* pending */
517 case -ENODEV: /* device removed */
518 case -ESHUTDOWN: /* device shut down */
519 /* no action necessary */
520 gig_dbg(DEBUG_USBREQ, "%s: %s",
521 __func__, get_usb_statmsg(status));
522 break;
523
524 default: /* severe trouble */
525 dev_warn(cs->dev, "control read: %s\n",
526 get_usb_statmsg(status));
527 if (ucs->retry_cmd_in++ < BAS_RETRY) {
528 dev_notice(cs->dev, "control read: retry %d\n",
529 ucs->retry_cmd_in);
530 rc = atread_submit(cs, BAS_TIMEOUT);
531 if (rc >= 0 || rc == -ENODEV)
532 /* resubmitted or disconnected */
533 /* - bypass regular exit block */
534 return;
535 } else {
536 dev_err(cs->dev,
537 "control read: giving up after %d tries\n",
538 ucs->retry_cmd_in);
539 }
540 error_reset(cs);
541 }
542
543 kfree(ucs->rcvbuf);
544 ucs->rcvbuf = NULL;
545 ucs->rcvbuf_size = 0;
546 if (have_data) {
547 gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
548 gigaset_schedule_event(cs);
549 }
550 }
551
552 /* atread_submit
553 * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
554 * parameters:
555 * cs controller state structure
556 * timeout timeout in 1/10 sec., 0: none
557 * return value:
558 * 0 on success
559 * -EBUSY if another request is pending
560 * any URB submission error code
561 */
562 static int atread_submit(struct cardstate *cs, int timeout)
563 {
564 struct bas_cardstate *ucs = cs->hw.bas;
565 int basstate;
566 int ret;
567
568 gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
569 ucs->rcvbuf_size);
570
571 basstate = update_basstate(ucs, BS_ATRDPEND, 0);
572 if (basstate & BS_ATRDPEND) {
573 dev_err(cs->dev,
574 "could not submit HD_READ_ATMESSAGE: URB busy\n");
575 return -EBUSY;
576 }
577
578 if (basstate & BS_SUSPEND) {
579 dev_notice(cs->dev,
580 "HD_READ_ATMESSAGE not submitted, "
581 "suspend in progress\n");
582 update_basstate(ucs, 0, BS_ATRDPEND);
583 /* treat like disconnect */
584 return -ENODEV;
585 }
586
587 ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
588 ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
589 ucs->dr_cmd_in.wValue = 0;
590 ucs->dr_cmd_in.wIndex = 0;
591 ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
592 usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
593 usb_rcvctrlpipe(ucs->udev, 0),
594 (unsigned char *) &ucs->dr_cmd_in,
595 ucs->rcvbuf, ucs->rcvbuf_size,
596 read_ctrl_callback, cs->inbuf);
597
598 ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC);
599 if (ret != 0) {
600 update_basstate(ucs, 0, BS_ATRDPEND);
601 dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
602 get_usb_rcmsg(ret));
603 return ret;
604 }
605
606 if (timeout > 0) {
607 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
608 ucs->timer_cmd_in.expires = jiffies + timeout * HZ / 10;
609 ucs->timer_cmd_in.data = (unsigned long) cs;
610 ucs->timer_cmd_in.function = cmd_in_timeout;
611 add_timer(&ucs->timer_cmd_in);
612 }
613 return 0;
614 }
615
616 /* read_int_callback
617 * USB completion handler for interrupt pipe input
618 * called by the USB subsystem in interrupt context
619 * parameter:
620 * urb USB request block
621 * urb->context = controller state structure
622 */
623 static void read_int_callback(struct urb *urb)
624 {
625 struct cardstate *cs = urb->context;
626 struct bas_cardstate *ucs = cs->hw.bas;
627 struct bc_state *bcs;
628 int status = urb->status;
629 unsigned long flags;
630 int rc;
631 unsigned l;
632 int channel;
633
634 switch (status) {
635 case 0: /* success */
636 break;
637 case -ENOENT: /* cancelled */
638 case -ECONNRESET: /* cancelled (async) */
639 case -EINPROGRESS: /* pending */
640 /* ignore silently */
641 gig_dbg(DEBUG_USBREQ, "%s: %s",
642 __func__, get_usb_statmsg(status));
643 return;
644 case -ENODEV: /* device removed */
645 case -ESHUTDOWN: /* device shut down */
646 gig_dbg(DEBUG_USBREQ, "%s: device disconnected", __func__);
647 return;
648 default: /* severe trouble */
649 dev_warn(cs->dev, "interrupt read: %s\n",
650 get_usb_statmsg(status));
651 goto resubmit;
652 }
653
654 /* drop incomplete packets even if the missing bytes wouldn't matter */
655 if (unlikely(urb->actual_length < IP_MSGSIZE)) {
656 dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
657 urb->actual_length);
658 goto resubmit;
659 }
660
661 l = (unsigned) ucs->int_in_buf[1] +
662 (((unsigned) ucs->int_in_buf[2]) << 8);
663
664 gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
665 urb->actual_length, (int)ucs->int_in_buf[0], l,
666 (int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
667
668 channel = 0;
669
670 switch (ucs->int_in_buf[0]) {
671 case HD_DEVICE_INIT_OK:
672 update_basstate(ucs, BS_INIT, 0);
673 break;
674
675 case HD_READY_SEND_ATDATA:
676 del_timer(&ucs->timer_atrdy);
677 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
678 start_cbsend(cs);
679 break;
680
681 case HD_OPEN_B2CHANNEL_ACK:
682 ++channel;
683 case HD_OPEN_B1CHANNEL_ACK:
684 bcs = cs->bcs + channel;
685 update_basstate(ucs, BS_B1OPEN << channel, 0);
686 gigaset_bchannel_up(bcs);
687 break;
688
689 case HD_OPEN_ATCHANNEL_ACK:
690 update_basstate(ucs, BS_ATOPEN, 0);
691 start_cbsend(cs);
692 break;
693
694 case HD_CLOSE_B2CHANNEL_ACK:
695 ++channel;
696 case HD_CLOSE_B1CHANNEL_ACK:
697 bcs = cs->bcs + channel;
698 update_basstate(ucs, 0, BS_B1OPEN << channel);
699 stopurbs(bcs->hw.bas);
700 gigaset_bchannel_down(bcs);
701 break;
702
703 case HD_CLOSE_ATCHANNEL_ACK:
704 update_basstate(ucs, 0, BS_ATOPEN);
705 break;
706
707 case HD_B2_FLOW_CONTROL:
708 ++channel;
709 case HD_B1_FLOW_CONTROL:
710 bcs = cs->bcs + channel;
711 atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
712 &bcs->hw.bas->corrbytes);
713 gig_dbg(DEBUG_ISO,
714 "Flow control (channel %d, sub %d): 0x%02x => %d",
715 channel, bcs->hw.bas->numsub, l,
716 atomic_read(&bcs->hw.bas->corrbytes));
717 break;
718
719 case HD_RECEIVEATDATA_ACK: /* AT response ready to be received */
720 if (!l) {
721 dev_warn(cs->dev,
722 "HD_RECEIVEATDATA_ACK with length 0 ignored\n");
723 break;
724 }
725 spin_lock_irqsave(&cs->lock, flags);
726 if (ucs->rcvbuf_size) {
727 /* throw away previous buffer - we have no queue */
728 dev_err(cs->dev,
729 "receive AT data overrun, %d bytes lost\n",
730 ucs->rcvbuf_size);
731 kfree(ucs->rcvbuf);
732 ucs->rcvbuf_size = 0;
733 }
734 ucs->rcvbuf = kmalloc(l, GFP_ATOMIC);
735 if (ucs->rcvbuf == NULL) {
736 spin_unlock_irqrestore(&cs->lock, flags);
737 dev_err(cs->dev, "out of memory receiving AT data\n");
738 error_reset(cs);
739 break;
740 }
741 ucs->rcvbuf_size = l;
742 ucs->retry_cmd_in = 0;
743 rc = atread_submit(cs, BAS_TIMEOUT);
744 if (rc < 0) {
745 kfree(ucs->rcvbuf);
746 ucs->rcvbuf = NULL;
747 ucs->rcvbuf_size = 0;
748 if (rc != -ENODEV) {
749 spin_unlock_irqrestore(&cs->lock, flags);
750 error_reset(cs);
751 break;
752 }
753 }
754 spin_unlock_irqrestore(&cs->lock, flags);
755 break;
756
757 case HD_RESET_INTERRUPT_PIPE_ACK:
758 update_basstate(ucs, 0, BS_RESETTING);
759 dev_notice(cs->dev, "interrupt pipe reset\n");
760 break;
761
762 case HD_SUSPEND_END:
763 gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
764 break;
765
766 default:
767 dev_warn(cs->dev,
768 "unknown Gigaset signal 0x%02x (%u) ignored\n",
769 (int) ucs->int_in_buf[0], l);
770 }
771
772 check_pending(ucs);
773 wake_up(&ucs->waitqueue);
774
775 resubmit:
776 rc = usb_submit_urb(urb, GFP_ATOMIC);
777 if (unlikely(rc != 0 && rc != -ENODEV)) {
778 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
779 get_usb_rcmsg(rc));
780 error_reset(cs);
781 }
782 }
783
784 /* read_iso_callback
785 * USB completion handler for B channel isochronous input
786 * called by the USB subsystem in interrupt context
787 * parameter:
788 * urb USB request block of completed request
789 * urb->context = bc_state structure
790 */
791 static void read_iso_callback(struct urb *urb)
792 {
793 struct bc_state *bcs;
794 struct bas_bc_state *ubc;
795 int status = urb->status;
796 unsigned long flags;
797 int i, rc;
798
799 /* status codes not worth bothering the tasklet with */
800 if (unlikely(status == -ENOENT ||
801 status == -ECONNRESET ||
802 status == -EINPROGRESS ||
803 status == -ENODEV ||
804 status == -ESHUTDOWN)) {
805 gig_dbg(DEBUG_ISO, "%s: %s",
806 __func__, get_usb_statmsg(status));
807 return;
808 }
809
810 bcs = urb->context;
811 ubc = bcs->hw.bas;
812
813 spin_lock_irqsave(&ubc->isoinlock, flags);
814 if (likely(ubc->isoindone == NULL)) {
815 /* pass URB to tasklet */
816 ubc->isoindone = urb;
817 ubc->isoinstatus = status;
818 tasklet_hi_schedule(&ubc->rcvd_tasklet);
819 } else {
820 /* tasklet still busy, drop data and resubmit URB */
821 ubc->loststatus = status;
822 for (i = 0; i < BAS_NUMFRAMES; i++) {
823 ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
824 if (unlikely(urb->iso_frame_desc[i].status != 0 &&
825 urb->iso_frame_desc[i].status !=
826 -EINPROGRESS))
827 ubc->loststatus = urb->iso_frame_desc[i].status;
828 urb->iso_frame_desc[i].status = 0;
829 urb->iso_frame_desc[i].actual_length = 0;
830 }
831 if (likely(ubc->running)) {
832 /* urb->dev is clobbered by USB subsystem */
833 urb->dev = bcs->cs->hw.bas->udev;
834 urb->transfer_flags = URB_ISO_ASAP;
835 urb->number_of_packets = BAS_NUMFRAMES;
836 gig_dbg(DEBUG_ISO, "%s: isoc read overrun/resubmit",
837 __func__);
838 rc = usb_submit_urb(urb, GFP_ATOMIC);
839 if (unlikely(rc != 0 && rc != -ENODEV)) {
840 dev_err(bcs->cs->dev,
841 "could not resubmit isochronous read "
842 "URB: %s\n", get_usb_rcmsg(rc));
843 dump_urb(DEBUG_ISO, "isoc read", urb);
844 error_hangup(bcs);
845 }
846 }
847 }
848 spin_unlock_irqrestore(&ubc->isoinlock, flags);
849 }
850
851 /* write_iso_callback
852 * USB completion handler for B channel isochronous output
853 * called by the USB subsystem in interrupt context
854 * parameter:
855 * urb USB request block of completed request
856 * urb->context = isow_urbctx_t structure
857 */
858 static void write_iso_callback(struct urb *urb)
859 {
860 struct isow_urbctx_t *ucx;
861 struct bas_bc_state *ubc;
862 int status = urb->status;
863 unsigned long flags;
864
865 /* status codes not worth bothering the tasklet with */
866 if (unlikely(status == -ENOENT ||
867 status == -ECONNRESET ||
868 status == -EINPROGRESS ||
869 status == -ENODEV ||
870 status == -ESHUTDOWN)) {
871 gig_dbg(DEBUG_ISO, "%s: %s",
872 __func__, get_usb_statmsg(status));
873 return;
874 }
875
876 /* pass URB context to tasklet */
877 ucx = urb->context;
878 ubc = ucx->bcs->hw.bas;
879 ucx->status = status;
880
881 spin_lock_irqsave(&ubc->isooutlock, flags);
882 ubc->isooutovfl = ubc->isooutdone;
883 ubc->isooutdone = ucx;
884 spin_unlock_irqrestore(&ubc->isooutlock, flags);
885 tasklet_hi_schedule(&ubc->sent_tasklet);
886 }
887
888 /* starturbs
889 * prepare and submit USB request blocks for isochronous input and output
890 * argument:
891 * B channel control structure
892 * return value:
893 * 0 on success
894 * < 0 on error (no URBs submitted)
895 */
896 static int starturbs(struct bc_state *bcs)
897 {
898 struct bas_bc_state *ubc = bcs->hw.bas;
899 struct urb *urb;
900 int j, k;
901 int rc;
902
903 /* initialize L2 reception */
904 if (bcs->proto2 == L2_HDLC)
905 bcs->inputstate |= INS_flag_hunt;
906
907 /* submit all isochronous input URBs */
908 ubc->running = 1;
909 for (k = 0; k < BAS_INURBS; k++) {
910 urb = ubc->isoinurbs[k];
911 if (!urb) {
912 rc = -EFAULT;
913 goto error;
914 }
915
916 urb->dev = bcs->cs->hw.bas->udev;
917 urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
918 urb->transfer_flags = URB_ISO_ASAP;
919 urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
920 urb->transfer_buffer_length = BAS_INBUFSIZE;
921 urb->number_of_packets = BAS_NUMFRAMES;
922 urb->interval = BAS_FRAMETIME;
923 urb->complete = read_iso_callback;
924 urb->context = bcs;
925 for (j = 0; j < BAS_NUMFRAMES; j++) {
926 urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
927 urb->iso_frame_desc[j].length = BAS_MAXFRAME;
928 urb->iso_frame_desc[j].status = 0;
929 urb->iso_frame_desc[j].actual_length = 0;
930 }
931
932 dump_urb(DEBUG_ISO, "Initial isoc read", urb);
933 rc = usb_submit_urb(urb, GFP_ATOMIC);
934 if (rc != 0)
935 goto error;
936 }
937
938 /* initialize L2 transmission */
939 gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
940
941 /* set up isochronous output URBs for flag idling */
942 for (k = 0; k < BAS_OUTURBS; ++k) {
943 urb = ubc->isoouturbs[k].urb;
944 if (!urb) {
945 rc = -EFAULT;
946 goto error;
947 }
948 urb->dev = bcs->cs->hw.bas->udev;
949 urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
950 urb->transfer_flags = URB_ISO_ASAP;
951 urb->transfer_buffer = ubc->isooutbuf->data;
952 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
953 urb->number_of_packets = BAS_NUMFRAMES;
954 urb->interval = BAS_FRAMETIME;
955 urb->complete = write_iso_callback;
956 urb->context = &ubc->isoouturbs[k];
957 for (j = 0; j < BAS_NUMFRAMES; ++j) {
958 urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
959 urb->iso_frame_desc[j].length = BAS_NORMFRAME;
960 urb->iso_frame_desc[j].status = 0;
961 urb->iso_frame_desc[j].actual_length = 0;
962 }
963 ubc->isoouturbs[k].limit = -1;
964 }
965
966 /* keep one URB free, submit the others */
967 for (k = 0; k < BAS_OUTURBS-1; ++k) {
968 dump_urb(DEBUG_ISO, "Initial isoc write", urb);
969 rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
970 if (rc != 0)
971 goto error;
972 }
973 dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
974 ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS-1];
975 ubc->isooutdone = ubc->isooutovfl = NULL;
976 return 0;
977 error:
978 stopurbs(ubc);
979 return rc;
980 }
981
982 /* stopurbs
983 * cancel the USB request blocks for isochronous input and output
984 * errors are silently ignored
985 * argument:
986 * B channel control structure
987 */
988 static void stopurbs(struct bas_bc_state *ubc)
989 {
990 int k, rc;
991
992 ubc->running = 0;
993
994 for (k = 0; k < BAS_INURBS; ++k) {
995 rc = usb_unlink_urb(ubc->isoinurbs[k]);
996 gig_dbg(DEBUG_ISO,
997 "%s: isoc input URB %d unlinked, result = %s",
998 __func__, k, get_usb_rcmsg(rc));
999 }
1000
1001 for (k = 0; k < BAS_OUTURBS; ++k) {
1002 rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
1003 gig_dbg(DEBUG_ISO,
1004 "%s: isoc output URB %d unlinked, result = %s",
1005 __func__, k, get_usb_rcmsg(rc));
1006 }
1007 }
1008
1009 /* Isochronous Write - Bottom Half */
1010 /* =============================== */
1011
1012 /* submit_iso_write_urb
1013 * fill and submit the next isochronous write URB
1014 * parameters:
1015 * ucx context structure containing URB
1016 * return value:
1017 * number of frames submitted in URB
1018 * 0 if URB not submitted because no data available (isooutbuf busy)
1019 * error code < 0 on error
1020 */
1021 static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
1022 {
1023 struct urb *urb = ucx->urb;
1024 struct bas_bc_state *ubc = ucx->bcs->hw.bas;
1025 struct usb_iso_packet_descriptor *ifd;
1026 int corrbytes, nframe, rc;
1027
1028 /* urb->dev is clobbered by USB subsystem */
1029 urb->dev = ucx->bcs->cs->hw.bas->udev;
1030 urb->transfer_flags = URB_ISO_ASAP;
1031 urb->transfer_buffer = ubc->isooutbuf->data;
1032 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
1033
1034 for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
1035 ifd = &urb->iso_frame_desc[nframe];
1036
1037 /* compute frame length according to flow control */
1038 ifd->length = BAS_NORMFRAME;
1039 corrbytes = atomic_read(&ubc->corrbytes);
1040 if (corrbytes != 0) {
1041 gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
1042 __func__, corrbytes);
1043 if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
1044 corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
1045 else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
1046 corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
1047 ifd->length += corrbytes;
1048 atomic_add(-corrbytes, &ubc->corrbytes);
1049 }
1050
1051 /* retrieve block of data to send */
1052 rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
1053 if (rc < 0) {
1054 if (rc == -EBUSY) {
1055 gig_dbg(DEBUG_ISO,
1056 "%s: buffer busy at frame %d",
1057 __func__, nframe);
1058 /* tasklet will be restarted from
1059 gigaset_isoc_send_skb() */
1060 } else {
1061 dev_err(ucx->bcs->cs->dev,
1062 "%s: buffer error %d at frame %d\n",
1063 __func__, rc, nframe);
1064 return rc;
1065 }
1066 break;
1067 }
1068 ifd->offset = rc;
1069 ucx->limit = ubc->isooutbuf->nextread;
1070 ifd->status = 0;
1071 ifd->actual_length = 0;
1072 }
1073 if (unlikely(nframe == 0))
1074 return 0; /* no data to send */
1075 urb->number_of_packets = nframe;
1076
1077 rc = usb_submit_urb(urb, GFP_ATOMIC);
1078 if (unlikely(rc)) {
1079 if (rc == -ENODEV)
1080 /* device removed - give up silently */
1081 gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
1082 else
1083 dev_err(ucx->bcs->cs->dev,
1084 "could not submit isochronous write URB: %s\n",
1085 get_usb_rcmsg(rc));
1086 return rc;
1087 }
1088 ++ubc->numsub;
1089 return nframe;
1090 }
1091
1092 /* write_iso_tasklet
1093 * tasklet scheduled when an isochronous output URB from the Gigaset device
1094 * has completed
1095 * parameter:
1096 * data B channel state structure
1097 */
1098 static void write_iso_tasklet(unsigned long data)
1099 {
1100 struct bc_state *bcs = (struct bc_state *) data;
1101 struct bas_bc_state *ubc = bcs->hw.bas;
1102 struct cardstate *cs = bcs->cs;
1103 struct isow_urbctx_t *done, *next, *ovfl;
1104 struct urb *urb;
1105 int status;
1106 struct usb_iso_packet_descriptor *ifd;
1107 int offset;
1108 unsigned long flags;
1109 int i;
1110 struct sk_buff *skb;
1111 int len;
1112 int rc;
1113
1114 /* loop while completed URBs arrive in time */
1115 for (;;) {
1116 if (unlikely(!(ubc->running))) {
1117 gig_dbg(DEBUG_ISO, "%s: not running", __func__);
1118 return;
1119 }
1120
1121 /* retrieve completed URBs */
1122 spin_lock_irqsave(&ubc->isooutlock, flags);
1123 done = ubc->isooutdone;
1124 ubc->isooutdone = NULL;
1125 ovfl = ubc->isooutovfl;
1126 ubc->isooutovfl = NULL;
1127 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1128 if (ovfl) {
1129 dev_err(cs->dev, "isochronous write buffer underrun\n");
1130 error_hangup(bcs);
1131 break;
1132 }
1133 if (!done)
1134 break;
1135
1136 /* submit free URB if available */
1137 spin_lock_irqsave(&ubc->isooutlock, flags);
1138 next = ubc->isooutfree;
1139 ubc->isooutfree = NULL;
1140 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1141 if (next) {
1142 rc = submit_iso_write_urb(next);
1143 if (unlikely(rc <= 0 && rc != -ENODEV)) {
1144 /* could not submit URB, put it back */
1145 spin_lock_irqsave(&ubc->isooutlock, flags);
1146 if (ubc->isooutfree == NULL) {
1147 ubc->isooutfree = next;
1148 next = NULL;
1149 }
1150 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1151 if (next) {
1152 /* couldn't put it back */
1153 dev_err(cs->dev,
1154 "losing isochronous write URB\n");
1155 error_hangup(bcs);
1156 }
1157 }
1158 }
1159
1160 /* process completed URB */
1161 urb = done->urb;
1162 status = done->status;
1163 switch (status) {
1164 case -EXDEV: /* partial completion */
1165 gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1166 __func__);
1167 /* fall through - what's the difference anyway? */
1168 case 0: /* normal completion */
1169 /* inspect individual frames
1170 * assumptions (for lack of documentation):
1171 * - actual_length bytes of first frame in error are
1172 * successfully sent
1173 * - all following frames are not sent at all
1174 */
1175 offset = done->limit; /* default (no error) */
1176 for (i = 0; i < BAS_NUMFRAMES; i++) {
1177 ifd = &urb->iso_frame_desc[i];
1178 if (ifd->status ||
1179 ifd->actual_length != ifd->length) {
1180 dev_warn(cs->dev,
1181 "isochronous write: frame %d: %s, "
1182 "only %d of %d bytes sent\n",
1183 i, get_usb_statmsg(ifd->status),
1184 ifd->actual_length, ifd->length);
1185 offset = (ifd->offset +
1186 ifd->actual_length)
1187 % BAS_OUTBUFSIZE;
1188 break;
1189 }
1190 }
1191 #ifdef CONFIG_GIGASET_DEBUG
1192 /* check assumption on remaining frames */
1193 for (; i < BAS_NUMFRAMES; i++) {
1194 ifd = &urb->iso_frame_desc[i];
1195 if (ifd->status != -EINPROGRESS
1196 || ifd->actual_length != 0) {
1197 dev_warn(cs->dev,
1198 "isochronous write: frame %d: %s, "
1199 "%d of %d bytes sent\n",
1200 i, get_usb_statmsg(ifd->status),
1201 ifd->actual_length, ifd->length);
1202 offset = (ifd->offset +
1203 ifd->actual_length)
1204 % BAS_OUTBUFSIZE;
1205 break;
1206 }
1207 }
1208 #endif
1209 break;
1210 case -EPIPE: /* stall - probably underrun */
1211 dev_err(cs->dev, "isochronous write stalled\n");
1212 error_hangup(bcs);
1213 break;
1214 default: /* severe trouble */
1215 dev_warn(cs->dev, "isochronous write: %s\n",
1216 get_usb_statmsg(status));
1217 }
1218
1219 /* mark the write buffer area covered by this URB as free */
1220 if (done->limit >= 0)
1221 ubc->isooutbuf->read = done->limit;
1222
1223 /* mark URB as free */
1224 spin_lock_irqsave(&ubc->isooutlock, flags);
1225 next = ubc->isooutfree;
1226 ubc->isooutfree = done;
1227 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1228 if (next) {
1229 /* only one URB still active - resubmit one */
1230 rc = submit_iso_write_urb(next);
1231 if (unlikely(rc <= 0 && rc != -ENODEV)) {
1232 /* couldn't submit */
1233 error_hangup(bcs);
1234 }
1235 }
1236 }
1237
1238 /* process queued SKBs */
1239 while ((skb = skb_dequeue(&bcs->squeue))) {
1240 /* copy to output buffer, doing L2 encapsulation */
1241 len = skb->len;
1242 if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
1243 /* insufficient buffer space, push back onto queue */
1244 skb_queue_head(&bcs->squeue, skb);
1245 gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
1246 __func__, skb_queue_len(&bcs->squeue));
1247 break;
1248 }
1249 skb_pull(skb, len);
1250 gigaset_skb_sent(bcs, skb);
1251 dev_kfree_skb_any(skb);
1252 }
1253 }
1254
1255 /* Isochronous Read - Bottom Half */
1256 /* ============================== */
1257
1258 /* read_iso_tasklet
1259 * tasklet scheduled when an isochronous input URB from the Gigaset device
1260 * has completed
1261 * parameter:
1262 * data B channel state structure
1263 */
1264 static void read_iso_tasklet(unsigned long data)
1265 {
1266 struct bc_state *bcs = (struct bc_state *) data;
1267 struct bas_bc_state *ubc = bcs->hw.bas;
1268 struct cardstate *cs = bcs->cs;
1269 struct urb *urb;
1270 int status;
1271 char *rcvbuf;
1272 unsigned long flags;
1273 int totleft, numbytes, offset, frame, rc;
1274
1275 /* loop while more completed URBs arrive in the meantime */
1276 for (;;) {
1277 /* retrieve URB */
1278 spin_lock_irqsave(&ubc->isoinlock, flags);
1279 urb = ubc->isoindone;
1280 if (!urb) {
1281 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1282 return;
1283 }
1284 status = ubc->isoinstatus;
1285 ubc->isoindone = NULL;
1286 if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1287 dev_warn(cs->dev,
1288 "isochronous read overrun, "
1289 "dropped URB with status: %s, %d bytes lost\n",
1290 get_usb_statmsg(ubc->loststatus),
1291 ubc->isoinlost);
1292 ubc->loststatus = -EINPROGRESS;
1293 }
1294 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1295
1296 if (unlikely(!(ubc->running))) {
1297 gig_dbg(DEBUG_ISO,
1298 "%s: channel not running, "
1299 "dropped URB with status: %s",
1300 __func__, get_usb_statmsg(status));
1301 return;
1302 }
1303
1304 switch (status) {
1305 case 0: /* normal completion */
1306 break;
1307 case -EXDEV: /* inspect individual frames
1308 (we do that anyway) */
1309 gig_dbg(DEBUG_ISO, "%s: URB partially completed",
1310 __func__);
1311 break;
1312 case -ENOENT:
1313 case -ECONNRESET:
1314 case -EINPROGRESS:
1315 gig_dbg(DEBUG_ISO, "%s: %s",
1316 __func__, get_usb_statmsg(status));
1317 continue; /* -> skip */
1318 case -EPIPE:
1319 dev_err(cs->dev, "isochronous read stalled\n");
1320 error_hangup(bcs);
1321 continue; /* -> skip */
1322 default: /* severe trouble */
1323 dev_warn(cs->dev, "isochronous read: %s\n",
1324 get_usb_statmsg(status));
1325 goto error;
1326 }
1327
1328 rcvbuf = urb->transfer_buffer;
1329 totleft = urb->actual_length;
1330 for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
1331 numbytes = urb->iso_frame_desc[frame].actual_length;
1332 if (unlikely(urb->iso_frame_desc[frame].status))
1333 dev_warn(cs->dev,
1334 "isochronous read: frame %d[%d]: %s\n",
1335 frame, numbytes,
1336 get_usb_statmsg(
1337 urb->iso_frame_desc[frame].status));
1338 if (unlikely(numbytes > BAS_MAXFRAME))
1339 dev_warn(cs->dev,
1340 "isochronous read: frame %d: "
1341 "numbytes (%d) > BAS_MAXFRAME\n",
1342 frame, numbytes);
1343 if (unlikely(numbytes > totleft)) {
1344 dev_warn(cs->dev,
1345 "isochronous read: frame %d: "
1346 "numbytes (%d) > totleft (%d)\n",
1347 frame, numbytes, totleft);
1348 numbytes = totleft;
1349 }
1350 offset = urb->iso_frame_desc[frame].offset;
1351 if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1352 dev_warn(cs->dev,
1353 "isochronous read: frame %d: "
1354 "offset (%d) + numbytes (%d) "
1355 "> BAS_INBUFSIZE\n",
1356 frame, offset, numbytes);
1357 numbytes = BAS_INBUFSIZE - offset;
1358 }
1359 gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
1360 totleft -= numbytes;
1361 }
1362 if (unlikely(totleft > 0))
1363 dev_warn(cs->dev,
1364 "isochronous read: %d data bytes missing\n",
1365 totleft);
1366
1367 error:
1368 /* URB processed, resubmit */
1369 for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
1370 urb->iso_frame_desc[frame].status = 0;
1371 urb->iso_frame_desc[frame].actual_length = 0;
1372 }
1373 /* urb->dev is clobbered by USB subsystem */
1374 urb->dev = bcs->cs->hw.bas->udev;
1375 urb->transfer_flags = URB_ISO_ASAP;
1376 urb->number_of_packets = BAS_NUMFRAMES;
1377 rc = usb_submit_urb(urb, GFP_ATOMIC);
1378 if (unlikely(rc != 0 && rc != -ENODEV)) {
1379 dev_err(cs->dev,
1380 "could not resubmit isochronous read URB: %s\n",
1381 get_usb_rcmsg(rc));
1382 dump_urb(DEBUG_ISO, "resubmit iso read", urb);
1383 error_hangup(bcs);
1384 }
1385 }
1386 }
1387
1388 /* Channel Operations */
1389 /* ================== */
1390
1391 /* req_timeout
1392 * timeout routine for control output request
1393 * argument:
1394 * B channel control structure
1395 */
1396 static void req_timeout(unsigned long data)
1397 {
1398 struct bc_state *bcs = (struct bc_state *) data;
1399 struct bas_cardstate *ucs = bcs->cs->hw.bas;
1400 int pending;
1401 unsigned long flags;
1402
1403 check_pending(ucs);
1404
1405 spin_lock_irqsave(&ucs->lock, flags);
1406 pending = ucs->pending;
1407 ucs->pending = 0;
1408 spin_unlock_irqrestore(&ucs->lock, flags);
1409
1410 switch (pending) {
1411 case 0: /* no pending request */
1412 gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1413 break;
1414
1415 case HD_OPEN_ATCHANNEL:
1416 dev_err(bcs->cs->dev, "timeout opening AT channel\n");
1417 error_reset(bcs->cs);
1418 break;
1419
1420 case HD_OPEN_B2CHANNEL:
1421 case HD_OPEN_B1CHANNEL:
1422 dev_err(bcs->cs->dev, "timeout opening channel %d\n",
1423 bcs->channel + 1);
1424 error_hangup(bcs);
1425 break;
1426
1427 case HD_CLOSE_ATCHANNEL:
1428 dev_err(bcs->cs->dev, "timeout closing AT channel\n");
1429 error_reset(bcs->cs);
1430 break;
1431
1432 case HD_CLOSE_B2CHANNEL:
1433 case HD_CLOSE_B1CHANNEL:
1434 dev_err(bcs->cs->dev, "timeout closing channel %d\n",
1435 bcs->channel + 1);
1436 error_reset(bcs->cs);
1437 break;
1438
1439 case HD_RESET_INTERRUPT_PIPE:
1440 /* error recovery escalation */
1441 dev_err(bcs->cs->dev,
1442 "reset interrupt pipe timeout, attempting USB reset\n");
1443 usb_queue_reset_device(bcs->cs->hw.bas->interface);
1444 break;
1445
1446 default:
1447 dev_warn(bcs->cs->dev, "request 0x%02x timed out, clearing\n",
1448 pending);
1449 }
1450
1451 wake_up(&ucs->waitqueue);
1452 }
1453
1454 /* write_ctrl_callback
1455 * USB completion handler for control pipe output
1456 * called by the USB subsystem in interrupt context
1457 * parameter:
1458 * urb USB request block of completed request
1459 * urb->context = hardware specific controller state structure
1460 */
1461 static void write_ctrl_callback(struct urb *urb)
1462 {
1463 struct bas_cardstate *ucs = urb->context;
1464 int status = urb->status;
1465 int rc;
1466 unsigned long flags;
1467
1468 /* check status */
1469 switch (status) {
1470 case 0: /* normal completion */
1471 spin_lock_irqsave(&ucs->lock, flags);
1472 switch (ucs->pending) {
1473 case HD_DEVICE_INIT_ACK: /* no reply expected */
1474 del_timer(&ucs->timer_ctrl);
1475 ucs->pending = 0;
1476 break;
1477 }
1478 spin_unlock_irqrestore(&ucs->lock, flags);
1479 return;
1480
1481 case -ENOENT: /* cancelled */
1482 case -ECONNRESET: /* cancelled (async) */
1483 case -EINPROGRESS: /* pending */
1484 case -ENODEV: /* device removed */
1485 case -ESHUTDOWN: /* device shut down */
1486 /* ignore silently */
1487 gig_dbg(DEBUG_USBREQ, "%s: %s",
1488 __func__, get_usb_statmsg(status));
1489 break;
1490
1491 default: /* any failure */
1492 /* don't retry if suspend requested */
1493 if (++ucs->retry_ctrl > BAS_RETRY ||
1494 (ucs->basstate & BS_SUSPEND)) {
1495 dev_err(&ucs->interface->dev,
1496 "control request 0x%02x failed: %s\n",
1497 ucs->dr_ctrl.bRequest,
1498 get_usb_statmsg(status));
1499 break; /* give up */
1500 }
1501 dev_notice(&ucs->interface->dev,
1502 "control request 0x%02x: %s, retry %d\n",
1503 ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
1504 ucs->retry_ctrl);
1505 /* urb->dev is clobbered by USB subsystem */
1506 urb->dev = ucs->udev;
1507 rc = usb_submit_urb(urb, GFP_ATOMIC);
1508 if (unlikely(rc)) {
1509 dev_err(&ucs->interface->dev,
1510 "could not resubmit request 0x%02x: %s\n",
1511 ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
1512 break;
1513 }
1514 /* resubmitted */
1515 return;
1516 }
1517
1518 /* failed, clear pending request */
1519 spin_lock_irqsave(&ucs->lock, flags);
1520 del_timer(&ucs->timer_ctrl);
1521 ucs->pending = 0;
1522 spin_unlock_irqrestore(&ucs->lock, flags);
1523 wake_up(&ucs->waitqueue);
1524 }
1525
1526 /* req_submit
1527 * submit a control output request without message buffer to the Gigaset base
1528 * and optionally start a timeout
1529 * parameters:
1530 * bcs B channel control structure
1531 * req control request code (HD_*)
1532 * val control request parameter value (set to 0 if unused)
1533 * timeout timeout in seconds (0: no timeout)
1534 * return value:
1535 * 0 on success
1536 * -EBUSY if another request is pending
1537 * any URB submission error code
1538 */
1539 static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
1540 {
1541 struct bas_cardstate *ucs = bcs->cs->hw.bas;
1542 int ret;
1543 unsigned long flags;
1544
1545 gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1546
1547 spin_lock_irqsave(&ucs->lock, flags);
1548 if (ucs->pending) {
1549 spin_unlock_irqrestore(&ucs->lock, flags);
1550 dev_err(bcs->cs->dev,
1551 "submission of request 0x%02x failed: "
1552 "request 0x%02x still pending\n",
1553 req, ucs->pending);
1554 return -EBUSY;
1555 }
1556
1557 ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
1558 ucs->dr_ctrl.bRequest = req;
1559 ucs->dr_ctrl.wValue = cpu_to_le16(val);
1560 ucs->dr_ctrl.wIndex = 0;
1561 ucs->dr_ctrl.wLength = 0;
1562 usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1563 usb_sndctrlpipe(ucs->udev, 0),
1564 (unsigned char *) &ucs->dr_ctrl, NULL, 0,
1565 write_ctrl_callback, ucs);
1566 ucs->retry_ctrl = 0;
1567 ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
1568 if (unlikely(ret)) {
1569 dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
1570 req, get_usb_rcmsg(ret));
1571 spin_unlock_irqrestore(&ucs->lock, flags);
1572 return ret;
1573 }
1574 ucs->pending = req;
1575
1576 if (timeout > 0) {
1577 gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1578 ucs->timer_ctrl.expires = jiffies + timeout * HZ / 10;
1579 ucs->timer_ctrl.data = (unsigned long) bcs;
1580 ucs->timer_ctrl.function = req_timeout;
1581 add_timer(&ucs->timer_ctrl);
1582 }
1583
1584 spin_unlock_irqrestore(&ucs->lock, flags);
1585 return 0;
1586 }
1587
1588 /* gigaset_init_bchannel
1589 * called by common.c to connect a B channel
1590 * initialize isochronous I/O and tell the Gigaset base to open the channel
1591 * argument:
1592 * B channel control structure
1593 * return value:
1594 * 0 on success, error code < 0 on error
1595 */
1596 static int gigaset_init_bchannel(struct bc_state *bcs)
1597 {
1598 struct cardstate *cs = bcs->cs;
1599 int req, ret;
1600 unsigned long flags;
1601
1602 spin_lock_irqsave(&cs->lock, flags);
1603 if (unlikely(!cs->connected)) {
1604 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1605 spin_unlock_irqrestore(&cs->lock, flags);
1606 return -ENODEV;
1607 }
1608
1609 if (cs->hw.bas->basstate & BS_SUSPEND) {
1610 dev_notice(cs->dev,
1611 "not starting isochronous I/O, "
1612 "suspend in progress\n");
1613 spin_unlock_irqrestore(&cs->lock, flags);
1614 return -EHOSTUNREACH;
1615 }
1616
1617 ret = starturbs(bcs);
1618 if (ret < 0) {
1619 dev_err(cs->dev,
1620 "could not start isochronous I/O for channel B%d: %s\n",
1621 bcs->channel + 1,
1622 ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
1623 if (ret != -ENODEV)
1624 error_hangup(bcs);
1625 spin_unlock_irqrestore(&cs->lock, flags);
1626 return ret;
1627 }
1628
1629 req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
1630 ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1631 if (ret < 0) {
1632 dev_err(cs->dev, "could not open channel B%d\n",
1633 bcs->channel + 1);
1634 stopurbs(bcs->hw.bas);
1635 if (ret != -ENODEV)
1636 error_hangup(bcs);
1637 }
1638
1639 spin_unlock_irqrestore(&cs->lock, flags);
1640 return ret;
1641 }
1642
1643 /* gigaset_close_bchannel
1644 * called by common.c to disconnect a B channel
1645 * tell the Gigaset base to close the channel
1646 * stopping isochronous I/O and LL notification will be done when the
1647 * acknowledgement for the close arrives
1648 * argument:
1649 * B channel control structure
1650 * return value:
1651 * 0 on success, error code < 0 on error
1652 */
1653 static int gigaset_close_bchannel(struct bc_state *bcs)
1654 {
1655 struct cardstate *cs = bcs->cs;
1656 int req, ret;
1657 unsigned long flags;
1658
1659 spin_lock_irqsave(&cs->lock, flags);
1660 if (unlikely(!cs->connected)) {
1661 spin_unlock_irqrestore(&cs->lock, flags);
1662 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1663 return -ENODEV;
1664 }
1665
1666 if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1667 /* channel not running: just signal common.c */
1668 spin_unlock_irqrestore(&cs->lock, flags);
1669 gigaset_bchannel_down(bcs);
1670 return 0;
1671 }
1672
1673 /* channel running: tell device to close it */
1674 req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
1675 ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
1676 if (ret < 0)
1677 dev_err(cs->dev, "closing channel B%d failed\n",
1678 bcs->channel + 1);
1679
1680 spin_unlock_irqrestore(&cs->lock, flags);
1681 return ret;
1682 }
1683
1684 /* Device Operations */
1685 /* ================= */
1686
1687 /* complete_cb
1688 * unqueue first command buffer from queue, waking any sleepers
1689 * must be called with cs->cmdlock held
1690 * parameter:
1691 * cs controller state structure
1692 */
1693 static void complete_cb(struct cardstate *cs)
1694 {
1695 struct cmdbuf_t *cb = cs->cmdbuf;
1696
1697 /* unqueue completed buffer */
1698 cs->cmdbytes -= cs->curlen;
1699 gig_dbg(DEBUG_OUTPUT, "write_command: sent %u bytes, %u left",
1700 cs->curlen, cs->cmdbytes);
1701 if (cb->next != NULL) {
1702 cs->cmdbuf = cb->next;
1703 cs->cmdbuf->prev = NULL;
1704 cs->curlen = cs->cmdbuf->len;
1705 } else {
1706 cs->cmdbuf = NULL;
1707 cs->lastcmdbuf = NULL;
1708 cs->curlen = 0;
1709 }
1710
1711 if (cb->wake_tasklet)
1712 tasklet_schedule(cb->wake_tasklet);
1713
1714 kfree(cb);
1715 }
1716
1717 /* write_command_callback
1718 * USB completion handler for AT command transmission
1719 * called by the USB subsystem in interrupt context
1720 * parameter:
1721 * urb USB request block of completed request
1722 * urb->context = controller state structure
1723 */
1724 static void write_command_callback(struct urb *urb)
1725 {
1726 struct cardstate *cs = urb->context;
1727 struct bas_cardstate *ucs = cs->hw.bas;
1728 int status = urb->status;
1729 unsigned long flags;
1730
1731 update_basstate(ucs, 0, BS_ATWRPEND);
1732 wake_up(&ucs->waitqueue);
1733
1734 /* check status */
1735 switch (status) {
1736 case 0: /* normal completion */
1737 break;
1738 case -ENOENT: /* cancelled */
1739 case -ECONNRESET: /* cancelled (async) */
1740 case -EINPROGRESS: /* pending */
1741 case -ENODEV: /* device removed */
1742 case -ESHUTDOWN: /* device shut down */
1743 /* ignore silently */
1744 gig_dbg(DEBUG_USBREQ, "%s: %s",
1745 __func__, get_usb_statmsg(status));
1746 return;
1747 default: /* any failure */
1748 if (++ucs->retry_cmd_out > BAS_RETRY) {
1749 dev_warn(cs->dev,
1750 "command write: %s, "
1751 "giving up after %d retries\n",
1752 get_usb_statmsg(status),
1753 ucs->retry_cmd_out);
1754 break;
1755 }
1756 if (ucs->basstate & BS_SUSPEND) {
1757 dev_warn(cs->dev,
1758 "command write: %s, "
1759 "won't retry - suspend requested\n",
1760 get_usb_statmsg(status));
1761 break;
1762 }
1763 if (cs->cmdbuf == NULL) {
1764 dev_warn(cs->dev,
1765 "command write: %s, "
1766 "cannot retry - cmdbuf gone\n",
1767 get_usb_statmsg(status));
1768 break;
1769 }
1770 dev_notice(cs->dev, "command write: %s, retry %d\n",
1771 get_usb_statmsg(status), ucs->retry_cmd_out);
1772 if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
1773 /* resubmitted - bypass regular exit block */
1774 return;
1775 /* command send failed, assume base still waiting */
1776 update_basstate(ucs, BS_ATREADY, 0);
1777 }
1778
1779 spin_lock_irqsave(&cs->cmdlock, flags);
1780 if (cs->cmdbuf != NULL)
1781 complete_cb(cs);
1782 spin_unlock_irqrestore(&cs->cmdlock, flags);
1783 }
1784
1785 /* atrdy_timeout
1786 * timeout routine for AT command transmission
1787 * argument:
1788 * controller state structure
1789 */
1790 static void atrdy_timeout(unsigned long data)
1791 {
1792 struct cardstate *cs = (struct cardstate *) data;
1793 struct bas_cardstate *ucs = cs->hw.bas;
1794
1795 dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
1796
1797 /* fake the missing signal - what else can I do? */
1798 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
1799 start_cbsend(cs);
1800 }
1801
1802 /* atwrite_submit
1803 * submit an HD_WRITE_ATMESSAGE command URB
1804 * parameters:
1805 * cs controller state structure
1806 * buf buffer containing command to send
1807 * len length of command to send
1808 * return value:
1809 * 0 on success
1810 * -EBUSY if another request is pending
1811 * any URB submission error code
1812 */
1813 static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
1814 {
1815 struct bas_cardstate *ucs = cs->hw.bas;
1816 int rc;
1817
1818 gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1819
1820 if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
1821 dev_err(cs->dev,
1822 "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
1823 return -EBUSY;
1824 }
1825
1826 ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
1827 ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
1828 ucs->dr_cmd_out.wValue = 0;
1829 ucs->dr_cmd_out.wIndex = 0;
1830 ucs->dr_cmd_out.wLength = cpu_to_le16(len);
1831 usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
1832 usb_sndctrlpipe(ucs->udev, 0),
1833 (unsigned char *) &ucs->dr_cmd_out, buf, len,
1834 write_command_callback, cs);
1835 rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
1836 if (unlikely(rc)) {
1837 update_basstate(ucs, 0, BS_ATWRPEND);
1838 dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
1839 get_usb_rcmsg(rc));
1840 return rc;
1841 }
1842
1843 /* submitted successfully, start timeout if necessary */
1844 if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
1845 gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
1846 ATRDY_TIMEOUT);
1847 ucs->timer_atrdy.expires = jiffies + ATRDY_TIMEOUT * HZ / 10;
1848 ucs->timer_atrdy.data = (unsigned long) cs;
1849 ucs->timer_atrdy.function = atrdy_timeout;
1850 add_timer(&ucs->timer_atrdy);
1851 }
1852 return 0;
1853 }
1854
1855 /* start_cbsend
1856 * start transmission of AT command queue if necessary
1857 * parameter:
1858 * cs controller state structure
1859 * return value:
1860 * 0 on success
1861 * error code < 0 on error
1862 */
1863 static int start_cbsend(struct cardstate *cs)
1864 {
1865 struct cmdbuf_t *cb;
1866 struct bas_cardstate *ucs = cs->hw.bas;
1867 unsigned long flags;
1868 int rc;
1869 int retval = 0;
1870
1871 /* check if suspend requested */
1872 if (ucs->basstate & BS_SUSPEND) {
1873 gig_dbg(DEBUG_OUTPUT, "suspending");
1874 return -EHOSTUNREACH;
1875 }
1876
1877 /* check if AT channel is open */
1878 if (!(ucs->basstate & BS_ATOPEN)) {
1879 gig_dbg(DEBUG_OUTPUT, "AT channel not open");
1880 rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
1881 if (rc < 0) {
1882 /* flush command queue */
1883 spin_lock_irqsave(&cs->cmdlock, flags);
1884 while (cs->cmdbuf != NULL)
1885 complete_cb(cs);
1886 spin_unlock_irqrestore(&cs->cmdlock, flags);
1887 }
1888 return rc;
1889 }
1890
1891 /* try to send first command in queue */
1892 spin_lock_irqsave(&cs->cmdlock, flags);
1893
1894 while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
1895 ucs->retry_cmd_out = 0;
1896 rc = atwrite_submit(cs, cb->buf, cb->len);
1897 if (unlikely(rc)) {
1898 retval = rc;
1899 complete_cb(cs);
1900 }
1901 }
1902
1903 spin_unlock_irqrestore(&cs->cmdlock, flags);
1904 return retval;
1905 }
1906
1907 /* gigaset_write_cmd
1908 * This function is called by the device independent part of the driver
1909 * to transmit an AT command string to the Gigaset device.
1910 * It encapsulates the device specific method for transmission over the
1911 * direct USB connection to the base.
1912 * The command string is added to the queue of commands to send, and
1913 * USB transmission is started if necessary.
1914 * parameters:
1915 * cs controller state structure
1916 * buf command string to send
1917 * len number of bytes to send (max. IF_WRITEBUF)
1918 * wake_tasklet tasklet to run when transmission is completed
1919 * (NULL if none)
1920 * return value:
1921 * number of bytes queued on success
1922 * error code < 0 on error
1923 */
1924 static int gigaset_write_cmd(struct cardstate *cs,
1925 const unsigned char *buf, int len,
1926 struct tasklet_struct *wake_tasklet)
1927 {
1928 struct cmdbuf_t *cb;
1929 unsigned long flags;
1930 int rc;
1931
1932 gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
1933 DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1934 "CMD Transmit", len, buf);
1935
1936 if (len <= 0) {
1937 /* nothing to do */
1938 rc = 0;
1939 goto notqueued;
1940 }
1941
1942 /* translate "+++" escape sequence sent as a single separate command
1943 * into "close AT channel" command for error recovery
1944 * The next command will reopen the AT channel automatically.
1945 */
1946 if (len == 3 && !memcmp(buf, "+++", 3)) {
1947 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
1948 goto notqueued;
1949 }
1950
1951 if (len > IF_WRITEBUF)
1952 len = IF_WRITEBUF;
1953 cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC);
1954 if (!cb) {
1955 dev_err(cs->dev, "%s: out of memory\n", __func__);
1956 rc = -ENOMEM;
1957 goto notqueued;
1958 }
1959
1960 memcpy(cb->buf, buf, len);
1961 cb->len = len;
1962 cb->offset = 0;
1963 cb->next = NULL;
1964 cb->wake_tasklet = wake_tasklet;
1965
1966 spin_lock_irqsave(&cs->cmdlock, flags);
1967 cb->prev = cs->lastcmdbuf;
1968 if (cs->lastcmdbuf)
1969 cs->lastcmdbuf->next = cb;
1970 else {
1971 cs->cmdbuf = cb;
1972 cs->curlen = len;
1973 }
1974 cs->cmdbytes += len;
1975 cs->lastcmdbuf = cb;
1976 spin_unlock_irqrestore(&cs->cmdlock, flags);
1977
1978 spin_lock_irqsave(&cs->lock, flags);
1979 if (unlikely(!cs->connected)) {
1980 spin_unlock_irqrestore(&cs->lock, flags);
1981 gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
1982 /* flush command queue */
1983 spin_lock_irqsave(&cs->cmdlock, flags);
1984 while (cs->cmdbuf != NULL)
1985 complete_cb(cs);
1986 spin_unlock_irqrestore(&cs->cmdlock, flags);
1987 return -ENODEV;
1988 }
1989 rc = start_cbsend(cs);
1990 spin_unlock_irqrestore(&cs->lock, flags);
1991 return rc < 0 ? rc : len;
1992
1993 notqueued: /* request handled without queuing */
1994 if (wake_tasklet)
1995 tasklet_schedule(wake_tasklet);
1996 return rc;
1997 }
1998
1999 /* gigaset_write_room
2000 * tty_driver.write_room interface routine
2001 * return number of characters the driver will accept to be written via
2002 * gigaset_write_cmd
2003 * parameter:
2004 * controller state structure
2005 * return value:
2006 * number of characters
2007 */
2008 static int gigaset_write_room(struct cardstate *cs)
2009 {
2010 return IF_WRITEBUF;
2011 }
2012
2013 /* gigaset_chars_in_buffer
2014 * tty_driver.chars_in_buffer interface routine
2015 * return number of characters waiting to be sent
2016 * parameter:
2017 * controller state structure
2018 * return value:
2019 * number of characters
2020 */
2021 static int gigaset_chars_in_buffer(struct cardstate *cs)
2022 {
2023 return cs->cmdbytes;
2024 }
2025
2026 /* gigaset_brkchars
2027 * implementation of ioctl(GIGASET_BRKCHARS)
2028 * parameter:
2029 * controller state structure
2030 * return value:
2031 * -EINVAL (unimplemented function)
2032 */
2033 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
2034 {
2035 return -EINVAL;
2036 }
2037
2038
2039 /* Device Initialization/Shutdown */
2040 /* ============================== */
2041
2042 /* Free hardware dependent part of the B channel structure
2043 * parameter:
2044 * bcs B channel structure
2045 * return value:
2046 * !=0 on success
2047 */
2048 static int gigaset_freebcshw(struct bc_state *bcs)
2049 {
2050 struct bas_bc_state *ubc = bcs->hw.bas;
2051 int i;
2052
2053 if (!ubc)
2054 return 0;
2055
2056 /* kill URBs and tasklets before freeing - better safe than sorry */
2057 ubc->running = 0;
2058 gig_dbg(DEBUG_INIT, "%s: killing iso URBs", __func__);
2059 for (i = 0; i < BAS_OUTURBS; ++i) {
2060 usb_kill_urb(ubc->isoouturbs[i].urb);
2061 usb_free_urb(ubc->isoouturbs[i].urb);
2062 }
2063 for (i = 0; i < BAS_INURBS; ++i) {
2064 usb_kill_urb(ubc->isoinurbs[i]);
2065 usb_free_urb(ubc->isoinurbs[i]);
2066 }
2067 tasklet_kill(&ubc->sent_tasklet);
2068 tasklet_kill(&ubc->rcvd_tasklet);
2069 kfree(ubc->isooutbuf);
2070 kfree(ubc);
2071 bcs->hw.bas = NULL;
2072 return 1;
2073 }
2074
2075 /* Initialize hardware dependent part of the B channel structure
2076 * parameter:
2077 * bcs B channel structure
2078 * return value:
2079 * !=0 on success
2080 */
2081 static int gigaset_initbcshw(struct bc_state *bcs)
2082 {
2083 int i;
2084 struct bas_bc_state *ubc;
2085
2086 bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
2087 if (!ubc) {
2088 pr_err("out of memory\n");
2089 return 0;
2090 }
2091
2092 ubc->running = 0;
2093 atomic_set(&ubc->corrbytes, 0);
2094 spin_lock_init(&ubc->isooutlock);
2095 for (i = 0; i < BAS_OUTURBS; ++i) {
2096 ubc->isoouturbs[i].urb = NULL;
2097 ubc->isoouturbs[i].bcs = bcs;
2098 }
2099 ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
2100 ubc->numsub = 0;
2101 ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL);
2102 if (!ubc->isooutbuf) {
2103 pr_err("out of memory\n");
2104 kfree(ubc);
2105 bcs->hw.bas = NULL;
2106 return 0;
2107 }
2108 tasklet_init(&ubc->sent_tasklet,
2109 write_iso_tasklet, (unsigned long) bcs);
2110
2111 spin_lock_init(&ubc->isoinlock);
2112 for (i = 0; i < BAS_INURBS; ++i)
2113 ubc->isoinurbs[i] = NULL;
2114 ubc->isoindone = NULL;
2115 ubc->loststatus = -EINPROGRESS;
2116 ubc->isoinlost = 0;
2117 ubc->seqlen = 0;
2118 ubc->inbyte = 0;
2119 ubc->inbits = 0;
2120 ubc->goodbytes = 0;
2121 ubc->alignerrs = 0;
2122 ubc->fcserrs = 0;
2123 ubc->frameerrs = 0;
2124 ubc->giants = 0;
2125 ubc->runts = 0;
2126 ubc->aborts = 0;
2127 ubc->shared0s = 0;
2128 ubc->stolen0s = 0;
2129 tasklet_init(&ubc->rcvd_tasklet,
2130 read_iso_tasklet, (unsigned long) bcs);
2131 return 1;
2132 }
2133
2134 static void gigaset_reinitbcshw(struct bc_state *bcs)
2135 {
2136 struct bas_bc_state *ubc = bcs->hw.bas;
2137
2138 bcs->hw.bas->running = 0;
2139 atomic_set(&bcs->hw.bas->corrbytes, 0);
2140 bcs->hw.bas->numsub = 0;
2141 spin_lock_init(&ubc->isooutlock);
2142 spin_lock_init(&ubc->isoinlock);
2143 ubc->loststatus = -EINPROGRESS;
2144 }
2145
2146 static void gigaset_freecshw(struct cardstate *cs)
2147 {
2148 /* timers, URBs and rcvbuf are disposed of in disconnect */
2149 kfree(cs->hw.bas->int_in_buf);
2150 kfree(cs->hw.bas);
2151 cs->hw.bas = NULL;
2152 }
2153
2154 static int gigaset_initcshw(struct cardstate *cs)
2155 {
2156 struct bas_cardstate *ucs;
2157
2158 cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
2159 if (!ucs) {
2160 pr_err("out of memory\n");
2161 return 0;
2162 }
2163 ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
2164 if (!ucs->int_in_buf) {
2165 kfree(ucs);
2166 pr_err("out of memory\n");
2167 return 0;
2168 }
2169
2170 ucs->urb_cmd_in = NULL;
2171 ucs->urb_cmd_out = NULL;
2172 ucs->rcvbuf = NULL;
2173 ucs->rcvbuf_size = 0;
2174
2175 spin_lock_init(&ucs->lock);
2176 ucs->pending = 0;
2177
2178 ucs->basstate = 0;
2179 init_timer(&ucs->timer_ctrl);
2180 init_timer(&ucs->timer_atrdy);
2181 init_timer(&ucs->timer_cmd_in);
2182 init_waitqueue_head(&ucs->waitqueue);
2183
2184 return 1;
2185 }
2186
2187 /* freeurbs
2188 * unlink and deallocate all URBs unconditionally
2189 * caller must make sure that no commands are still in progress
2190 * parameter:
2191 * cs controller state structure
2192 */
2193 static void freeurbs(struct cardstate *cs)
2194 {
2195 struct bas_cardstate *ucs = cs->hw.bas;
2196 struct bas_bc_state *ubc;
2197 int i, j;
2198
2199 gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
2200 for (j = 0; j < BAS_CHANNELS; ++j) {
2201 ubc = cs->bcs[j].hw.bas;
2202 for (i = 0; i < BAS_OUTURBS; ++i) {
2203 usb_kill_urb(ubc->isoouturbs[i].urb);
2204 usb_free_urb(ubc->isoouturbs[i].urb);
2205 ubc->isoouturbs[i].urb = NULL;
2206 }
2207 for (i = 0; i < BAS_INURBS; ++i) {
2208 usb_kill_urb(ubc->isoinurbs[i]);
2209 usb_free_urb(ubc->isoinurbs[i]);
2210 ubc->isoinurbs[i] = NULL;
2211 }
2212 }
2213 usb_kill_urb(ucs->urb_int_in);
2214 usb_free_urb(ucs->urb_int_in);
2215 ucs->urb_int_in = NULL;
2216 usb_kill_urb(ucs->urb_cmd_out);
2217 usb_free_urb(ucs->urb_cmd_out);
2218 ucs->urb_cmd_out = NULL;
2219 usb_kill_urb(ucs->urb_cmd_in);
2220 usb_free_urb(ucs->urb_cmd_in);
2221 ucs->urb_cmd_in = NULL;
2222 usb_kill_urb(ucs->urb_ctrl);
2223 usb_free_urb(ucs->urb_ctrl);
2224 ucs->urb_ctrl = NULL;
2225 }
2226
2227 /* gigaset_probe
2228 * This function is called when a new USB device is connected.
2229 * It checks whether the new device is handled by this driver.
2230 */
2231 static int gigaset_probe(struct usb_interface *interface,
2232 const struct usb_device_id *id)
2233 {
2234 struct usb_host_interface *hostif;
2235 struct usb_device *udev = interface_to_usbdev(interface);
2236 struct cardstate *cs = NULL;
2237 struct bas_cardstate *ucs = NULL;
2238 struct bas_bc_state *ubc;
2239 struct usb_endpoint_descriptor *endpoint;
2240 int i, j;
2241 int rc;
2242
2243 gig_dbg(DEBUG_INIT,
2244 "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
2245 __func__, le16_to_cpu(udev->descriptor.idVendor),
2246 le16_to_cpu(udev->descriptor.idProduct));
2247
2248 /* set required alternate setting */
2249 hostif = interface->cur_altsetting;
2250 if (hostif->desc.bAlternateSetting != 3) {
2251 gig_dbg(DEBUG_INIT,
2252 "%s: wrong alternate setting %d - trying to switch",
2253 __func__, hostif->desc.bAlternateSetting);
2254 if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3)
2255 < 0) {
2256 dev_warn(&udev->dev, "usb_set_interface failed, "
2257 "device %d interface %d altsetting %d\n",
2258 udev->devnum, hostif->desc.bInterfaceNumber,
2259 hostif->desc.bAlternateSetting);
2260 return -ENODEV;
2261 }
2262 hostif = interface->cur_altsetting;
2263 }
2264
2265 /* Reject application specific interfaces
2266 */
2267 if (hostif->desc.bInterfaceClass != 255) {
2268 dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
2269 __func__, hostif->desc.bInterfaceClass);
2270 return -ENODEV;
2271 }
2272
2273 dev_info(&udev->dev,
2274 "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
2275 __func__, le16_to_cpu(udev->descriptor.idVendor),
2276 le16_to_cpu(udev->descriptor.idProduct));
2277
2278 /* allocate memory for our device state and intialize it */
2279 cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
2280 GIGASET_MODULENAME);
2281 if (!cs)
2282 return -ENODEV;
2283 ucs = cs->hw.bas;
2284
2285 /* save off device structure ptrs for later use */
2286 usb_get_dev(udev);
2287 ucs->udev = udev;
2288 ucs->interface = interface;
2289 cs->dev = &interface->dev;
2290
2291 /* allocate URBs:
2292 * - one for the interrupt pipe
2293 * - three for the different uses of the default control pipe
2294 * - three for each isochronous pipe
2295 */
2296 if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2297 !(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
2298 !(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
2299 !(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
2300 goto allocerr;
2301
2302 for (j = 0; j < BAS_CHANNELS; ++j) {
2303 ubc = cs->bcs[j].hw.bas;
2304 for (i = 0; i < BAS_OUTURBS; ++i)
2305 if (!(ubc->isoouturbs[i].urb =
2306 usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2307 goto allocerr;
2308 for (i = 0; i < BAS_INURBS; ++i)
2309 if (!(ubc->isoinurbs[i] =
2310 usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
2311 goto allocerr;
2312 }
2313
2314 ucs->rcvbuf = NULL;
2315 ucs->rcvbuf_size = 0;
2316
2317 /* Fill the interrupt urb and send it to the core */
2318 endpoint = &hostif->endpoint[0].desc;
2319 usb_fill_int_urb(ucs->urb_int_in, udev,
2320 usb_rcvintpipe(udev,
2321 (endpoint->bEndpointAddress) & 0x0f),
2322 ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
2323 endpoint->bInterval);
2324 rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2325 if (rc != 0) {
2326 dev_err(cs->dev, "could not submit interrupt URB: %s\n",
2327 get_usb_rcmsg(rc));
2328 goto error;
2329 }
2330
2331 /* tell the device that the driver is ready */
2332 rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0);
2333 if (rc != 0)
2334 goto error;
2335
2336 /* tell common part that the device is ready */
2337 if (startmode == SM_LOCKED)
2338 cs->mstate = MS_LOCKED;
2339
2340 /* save address of controller structure */
2341 usb_set_intfdata(interface, cs);
2342
2343 if (!gigaset_start(cs))
2344 goto error;
2345
2346 return 0;
2347
2348 allocerr:
2349 dev_err(cs->dev, "could not allocate URBs\n");
2350 error:
2351 freeurbs(cs);
2352 usb_set_intfdata(interface, NULL);
2353 gigaset_freecs(cs);
2354 return -ENODEV;
2355 }
2356
2357 /* gigaset_disconnect
2358 * This function is called when the Gigaset base is unplugged.
2359 */
2360 static void gigaset_disconnect(struct usb_interface *interface)
2361 {
2362 struct cardstate *cs;
2363 struct bas_cardstate *ucs;
2364 int j;
2365
2366 cs = usb_get_intfdata(interface);
2367
2368 ucs = cs->hw.bas;
2369
2370 dev_info(cs->dev, "disconnecting Gigaset base\n");
2371
2372 /* mark base as not ready, all channels disconnected */
2373 ucs->basstate = 0;
2374
2375 /* tell LL all channels are down */
2376 for (j = 0; j < BAS_CHANNELS; ++j)
2377 gigaset_bchannel_down(cs->bcs + j);
2378
2379 /* stop driver (common part) */
2380 gigaset_stop(cs);
2381
2382 /* stop timers and URBs, free ressources */
2383 del_timer_sync(&ucs->timer_ctrl);
2384 del_timer_sync(&ucs->timer_atrdy);
2385 del_timer_sync(&ucs->timer_cmd_in);
2386 freeurbs(cs);
2387 usb_set_intfdata(interface, NULL);
2388 kfree(ucs->rcvbuf);
2389 ucs->rcvbuf = NULL;
2390 ucs->rcvbuf_size = 0;
2391 usb_put_dev(ucs->udev);
2392 ucs->interface = NULL;
2393 ucs->udev = NULL;
2394 cs->dev = NULL;
2395 gigaset_freecs(cs);
2396 }
2397
2398 /* gigaset_suspend
2399 * This function is called before the USB connection is suspended.
2400 */
2401 static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
2402 {
2403 struct cardstate *cs = usb_get_intfdata(intf);
2404 struct bas_cardstate *ucs = cs->hw.bas;
2405 int rc;
2406
2407 /* set suspend flag; this stops AT command/response traffic */
2408 if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
2409 gig_dbg(DEBUG_SUSPEND, "already suspended");
2410 return 0;
2411 }
2412
2413 /* wait a bit for blocking conditions to go away */
2414 rc = wait_event_timeout(ucs->waitqueue,
2415 !(ucs->basstate &
2416 (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)),
2417 BAS_TIMEOUT*HZ/10);
2418 gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
2419
2420 /* check for conditions preventing suspend */
2421 if (ucs->basstate & (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)) {
2422 dev_warn(cs->dev, "cannot suspend:\n");
2423 if (ucs->basstate & BS_B1OPEN)
2424 dev_warn(cs->dev, " B channel 1 open\n");
2425 if (ucs->basstate & BS_B2OPEN)
2426 dev_warn(cs->dev, " B channel 2 open\n");
2427 if (ucs->basstate & BS_ATRDPEND)
2428 dev_warn(cs->dev, " receiving AT reply\n");
2429 if (ucs->basstate & BS_ATWRPEND)
2430 dev_warn(cs->dev, " sending AT command\n");
2431 update_basstate(ucs, 0, BS_SUSPEND);
2432 return -EBUSY;
2433 }
2434
2435 /* close AT channel if open */
2436 if (ucs->basstate & BS_ATOPEN) {
2437 gig_dbg(DEBUG_SUSPEND, "closing AT channel");
2438 rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
2439 if (rc) {
2440 update_basstate(ucs, 0, BS_SUSPEND);
2441 return rc;
2442 }
2443 wait_event_timeout(ucs->waitqueue, !ucs->pending,
2444 BAS_TIMEOUT*HZ/10);
2445 /* in case of timeout, proceed anyway */
2446 }
2447
2448 /* kill all URBs and timers that might still be pending */
2449 usb_kill_urb(ucs->urb_ctrl);
2450 usb_kill_urb(ucs->urb_int_in);
2451 del_timer_sync(&ucs->timer_ctrl);
2452
2453 gig_dbg(DEBUG_SUSPEND, "suspend complete");
2454 return 0;
2455 }
2456
2457 /* gigaset_resume
2458 * This function is called after the USB connection has been resumed.
2459 */
2460 static int gigaset_resume(struct usb_interface *intf)
2461 {
2462 struct cardstate *cs = usb_get_intfdata(intf);
2463 struct bas_cardstate *ucs = cs->hw.bas;
2464 int rc;
2465
2466 /* resubmit interrupt URB for spontaneous messages from base */
2467 rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
2468 if (rc) {
2469 dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
2470 get_usb_rcmsg(rc));
2471 return rc;
2472 }
2473
2474 /* clear suspend flag to reallow activity */
2475 update_basstate(ucs, 0, BS_SUSPEND);
2476
2477 gig_dbg(DEBUG_SUSPEND, "resume complete");
2478 return 0;
2479 }
2480
2481 /* gigaset_pre_reset
2482 * This function is called before the USB connection is reset.
2483 */
2484 static int gigaset_pre_reset(struct usb_interface *intf)
2485 {
2486 /* handle just like suspend */
2487 return gigaset_suspend(intf, PMSG_ON);
2488 }
2489
2490 /* gigaset_post_reset
2491 * This function is called after the USB connection has been reset.
2492 */
2493 static int gigaset_post_reset(struct usb_interface *intf)
2494 {
2495 /* FIXME: send HD_DEVICE_INIT_ACK? */
2496
2497 /* resume operations */
2498 return gigaset_resume(intf);
2499 }
2500
2501
2502 static const struct gigaset_ops gigops = {
2503 gigaset_write_cmd,
2504 gigaset_write_room,
2505 gigaset_chars_in_buffer,
2506 gigaset_brkchars,
2507 gigaset_init_bchannel,
2508 gigaset_close_bchannel,
2509 gigaset_initbcshw,
2510 gigaset_freebcshw,
2511 gigaset_reinitbcshw,
2512 gigaset_initcshw,
2513 gigaset_freecshw,
2514 gigaset_set_modem_ctrl,
2515 gigaset_baud_rate,
2516 gigaset_set_line_ctrl,
2517 gigaset_isoc_send_skb,
2518 gigaset_isoc_input,
2519 };
2520
2521 /* bas_gigaset_init
2522 * This function is called after the kernel module is loaded.
2523 */
2524 static int __init bas_gigaset_init(void)
2525 {
2526 int result;
2527
2528 /* allocate memory for our driver state and intialize it */
2529 driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2530 GIGASET_MODULENAME, GIGASET_DEVNAME,
2531 &gigops, THIS_MODULE);
2532 if (driver == NULL)
2533 goto error;
2534
2535 /* register this driver with the USB subsystem */
2536 result = usb_register(&gigaset_usb_driver);
2537 if (result < 0) {
2538 pr_err("error %d registering USB driver\n", -result);
2539 goto error;
2540 }
2541
2542 pr_info(DRIVER_DESC "\n");
2543 return 0;
2544
2545 error:
2546 if (driver)
2547 gigaset_freedriver(driver);
2548 driver = NULL;
2549 return -1;
2550 }
2551
2552 /* bas_gigaset_exit
2553 * This function is called before the kernel module is unloaded.
2554 */
2555 static void __exit bas_gigaset_exit(void)
2556 {
2557 struct bas_cardstate *ucs;
2558 int i;
2559
2560 gigaset_blockdriver(driver); /* => probe will fail
2561 * => no gigaset_start any more
2562 */
2563
2564 /* stop all connected devices */
2565 for (i = 0; i < driver->minors; i++) {
2566 if (gigaset_shutdown(driver->cs + i) < 0)
2567 continue; /* no device */
2568 /* from now on, no isdn callback should be possible */
2569
2570 /* close all still open channels */
2571 ucs = driver->cs[i].hw.bas;
2572 if (ucs->basstate & BS_B1OPEN) {
2573 gig_dbg(DEBUG_INIT, "closing B1 channel");
2574 usb_control_msg(ucs->udev,
2575 usb_sndctrlpipe(ucs->udev, 0),
2576 HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
2577 0, 0, NULL, 0, BAS_TIMEOUT);
2578 }
2579 if (ucs->basstate & BS_B2OPEN) {
2580 gig_dbg(DEBUG_INIT, "closing B2 channel");
2581 usb_control_msg(ucs->udev,
2582 usb_sndctrlpipe(ucs->udev, 0),
2583 HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
2584 0, 0, NULL, 0, BAS_TIMEOUT);
2585 }
2586 if (ucs->basstate & BS_ATOPEN) {
2587 gig_dbg(DEBUG_INIT, "closing AT channel");
2588 usb_control_msg(ucs->udev,
2589 usb_sndctrlpipe(ucs->udev, 0),
2590 HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
2591 0, 0, NULL, 0, BAS_TIMEOUT);
2592 }
2593 ucs->basstate = 0;
2594 }
2595
2596 /* deregister this driver with the USB subsystem */
2597 usb_deregister(&gigaset_usb_driver);
2598 /* this will call the disconnect-callback */
2599 /* from now on, no disconnect/probe callback should be running */
2600
2601 gigaset_freedriver(driver);
2602 driver = NULL;
2603 }
2604
2605
2606 module_init(bas_gigaset_init);
2607 module_exit(bas_gigaset_exit);
2608
2609 MODULE_AUTHOR(DRIVER_AUTHOR);
2610 MODULE_DESCRIPTION(DRIVER_DESC);
2611 MODULE_LICENSE("GPL");
Linux 2.6 ibm-acpi/thinkpad-acpi driver git tree