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[PATCH] isdn4linux: Siemens Gigaset drivers: code cleanup
[linux-2.6/mini2440.git] / drivers / isdn / gigaset / bas-gigaset.c
blobfb2c13ae7cfd5c7fbb873da6bc474031e1bd7fc4
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 <Eilers.Stefan@epost.de>.
7 *
8 * Based on usb-gigaset.c.
9 *
10 * =====================================================================
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of
14 * the License, or (at your option) any later version.
15 * =====================================================================
16 */
17
18 #include "gigaset.h"
19
20 #include <linux/errno.h>
21 #include <linux/init.h>
22 #include <linux/slab.h>
23 #include <linux/timer.h>
24 #include <linux/usb.h>
25 #include <linux/module.h>
26 #include <linux/moduleparam.h>
27
28 /* Version Information */
29 #define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers <Eilers.Stefan@epost.de>"
30 #define DRIVER_DESC "USB Driver for Gigaset 307x"
31
32
33 /* Module parameters */
34
35 static int startmode = SM_ISDN;
36 static int cidmode = 1;
37
38 module_param(startmode, int, S_IRUGO);
39 module_param(cidmode, int, S_IRUGO);
40 MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
41 MODULE_PARM_DESC(cidmode, "Call-ID mode");
42
43 #define GIGASET_MINORS 1
44 #define GIGASET_MINOR 16
45 #define GIGASET_MODULENAME "bas_gigaset"
46 #define GIGASET_DEVFSNAME "gig/bas/"
47 #define GIGASET_DEVNAME "ttyGB"
48
49 #define IF_WRITEBUF 256 //FIXME
50
51 /* Values for the Gigaset 307x */
52 #define USB_GIGA_VENDOR_ID 0x0681
53 #define USB_GIGA_PRODUCT_ID 0x0001
54 #define USB_4175_PRODUCT_ID 0x0002
55 #define USB_SX303_PRODUCT_ID 0x0021
56 #define USB_SX353_PRODUCT_ID 0x0022
57
58 /* table of devices that work with this driver */
59 static struct usb_device_id gigaset_table [] = {
60 { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_GIGA_PRODUCT_ID) },
61 { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_4175_PRODUCT_ID) },
62 { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX303_PRODUCT_ID) },
63 { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX353_PRODUCT_ID) },
64 { } /* Terminating entry */
65 };
66
67 MODULE_DEVICE_TABLE(usb, gigaset_table);
68
69 /*======================= local function prototypes =============================*/
70
71 /* This function is called if a new device is connected to the USB port. It
72 * checks whether this new device belongs to this driver.
73 */
74 static int gigaset_probe(struct usb_interface *interface,
75 const struct usb_device_id *id);
76
77 /* Function will be called if the device is unplugged */
78 static void gigaset_disconnect(struct usb_interface *interface);
79
80
81 /*==============================================================================*/
82
83 struct bas_cardstate {
84 struct usb_device *udev; /* USB device pointer */
85 struct usb_interface *interface; /* interface for this device */
86 unsigned char minor; /* starting minor number */
87
88 struct urb *urb_ctrl; /* control pipe default URB */
89 struct usb_ctrlrequest dr_ctrl;
90 struct timer_list timer_ctrl; /* control request timeout */
91
92 struct timer_list timer_atrdy; /* AT command ready timeout */
93 struct urb *urb_cmd_out; /* for sending AT commands */
94 struct usb_ctrlrequest dr_cmd_out;
95 int retry_cmd_out;
96
97 struct urb *urb_cmd_in; /* for receiving AT replies */
98 struct usb_ctrlrequest dr_cmd_in;
99 struct timer_list timer_cmd_in; /* receive request timeout */
100 unsigned char *rcvbuf; /* AT reply receive buffer */
101
102 struct urb *urb_int_in; /* URB for interrupt pipe */
103 unsigned char int_in_buf[3];
104
105 spinlock_t lock; /* locks all following */
106 atomic_t basstate; /* bitmap (BS_*) */
107 int pending; /* uncompleted base request */
108 int rcvbuf_size; /* size of AT receive buffer */
109 /* 0: no receive in progress */
110 int retry_cmd_in; /* receive req retry count */
111 };
112
113 /* status of direct USB connection to 307x base (bits in basstate) */
114 #define BS_ATOPEN 0x001
115 #define BS_B1OPEN 0x002
116 #define BS_B2OPEN 0x004
117 #define BS_ATREADY 0x008
118 #define BS_INIT 0x010
119 #define BS_ATTIMER 0x020
120
121
122 static struct gigaset_driver *driver = NULL;
123 static struct cardstate *cardstate = NULL;
124
125 /* usb specific object needed to register this driver with the usb subsystem */
126 static struct usb_driver gigaset_usb_driver = {
127 .name = GIGASET_MODULENAME,
128 .probe = gigaset_probe,
129 .disconnect = gigaset_disconnect,
130 .id_table = gigaset_table,
131 };
132
133 /* get message text for USB status code
134 */
135 static char *get_usb_statmsg(int status)
136 {
137 static char unkmsg[28];
138
139 switch (status) {
140 case 0:
141 return "success";
142 case -ENOENT:
143 return "canceled";
144 case -ECONNRESET:
145 return "canceled (async)";
146 case -EINPROGRESS:
147 return "pending";
148 case -EPROTO:
149 return "bit stuffing or unknown USB error";
150 case -EILSEQ:
151 return "Illegal byte sequence (CRC mismatch)";
152 case -EPIPE:
153 return "babble detect or endpoint stalled";
154 case -ENOSR:
155 return "buffer error";
156 case -ETIMEDOUT:
157 return "timed out";
158 case -ENODEV:
159 return "device not present";
160 case -EREMOTEIO:
161 return "short packet detected";
162 case -EXDEV:
163 return "partial isochronous transfer";
164 case -EINVAL:
165 return "invalid argument";
166 case -ENXIO:
167 return "URB already queued";
168 case -EAGAIN:
169 return "isochronous start frame too early or too much scheduled";
170 case -EFBIG:
171 return "too many isochronous frames requested";
172 case -EMSGSIZE:
173 return "endpoint message size zero";
174 case -ESHUTDOWN:
175 return "endpoint shutdown";
176 case -EBUSY:
177 return "another request pending";
178 default:
179 snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", status);
180 return unkmsg;
181 }
182 }
183
184 /* usb_pipetype_str
185 * retrieve string representation of USB pipe type
186 */
187 static inline char *usb_pipetype_str(int pipe)
188 {
189 if (usb_pipeisoc(pipe))
190 return "Isoc";
191 if (usb_pipeint(pipe))
192 return "Int";
193 if (usb_pipecontrol(pipe))
194 return "Ctrl";
195 if (usb_pipebulk(pipe))
196 return "Bulk";
197 return "?";
198 }
199
200 /* dump_urb
201 * write content of URB to syslog for debugging
202 */
203 static inline void dump_urb(enum debuglevel level, const char *tag,
204 struct urb *urb)
205 {
206 #ifdef CONFIG_GIGASET_DEBUG
207 int i;
208 IFNULLRET(tag);
209 dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
210 if (urb) {
211 dbg(level,
212 " dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
213 "status=%d, hcpriv=0x%08lx, transfer_flags=0x%x,",
214 (unsigned long) urb->dev,
215 usb_pipetype_str(urb->pipe),
216 usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
217 usb_pipein(urb->pipe) ? "in" : "out",
218 urb->status, (unsigned long) urb->hcpriv,
219 urb->transfer_flags);
220 dbg(level,
221 " transfer_buffer=0x%08lx[%d], actual_length=%d, "
222 "bandwidth=%d, setup_packet=0x%08lx,",
223 (unsigned long) urb->transfer_buffer,
224 urb->transfer_buffer_length, urb->actual_length,
225 urb->bandwidth, (unsigned long) urb->setup_packet);
226 dbg(level,
227 " start_frame=%d, number_of_packets=%d, interval=%d, "
228 "error_count=%d,",
229 urb->start_frame, urb->number_of_packets, urb->interval,
230 urb->error_count);
231 dbg(level,
232 " context=0x%08lx, complete=0x%08lx, iso_frame_desc[]={",
233 (unsigned long) urb->context,
234 (unsigned long) urb->complete);
235 for (i = 0; i < urb->number_of_packets; i++) {
236 struct usb_iso_packet_descriptor *pifd
237 = &urb->iso_frame_desc[i];
238 dbg(level,
239 " {offset=%u, length=%u, actual_length=%u, "
240 "status=%u}",
241 pifd->offset, pifd->length, pifd->actual_length,
242 pifd->status);
243 }
244 }
245 dbg(level, "}}");
246 #endif
247 }
248
249 /* read/set modem control bits etc. (m10x only) */
250 static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
251 unsigned new_state)
252 {
253 return -EINVAL;
254 }
255
256 static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
257 {
258 return -EINVAL;
259 }
260
261 static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
262 {
263 return -EINVAL;
264 }
265
266 /* error_hangup
267 * hang up any existing connection because of an unrecoverable error
268 * This function may be called from any context and takes care of scheduling
269 * the necessary actions for execution outside of interrupt context.
270 * argument:
271 * B channel control structure
272 */
273 static inline void error_hangup(struct bc_state *bcs)
274 {
275 struct cardstate *cs = bcs->cs;
276
277 dbg(DEBUG_ANY,
278 "%s: scheduling HUP for channel %d", __func__, bcs->channel);
279
280 if (!gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL)) {
281 //FIXME what should we do?
282 return;
283 }
284
285 gigaset_schedule_event(cs);
286 }
287
288 /* error_reset
289 * reset Gigaset device because of an unrecoverable error
290 * This function may be called from any context and takes care of scheduling
291 * the necessary actions for execution outside of interrupt context.
292 * argument:
293 * controller state structure
294 */
295 static inline void error_reset(struct cardstate *cs)
296 {
297 //FIXME try to recover without bothering the user
298 err("unrecoverable error - please disconnect the Gigaset base to reset");
299 }
300
301 /* check_pending
302 * check for completion of pending control request
303 * parameter:
304 * urb USB request block of completed request
305 * urb->context = hardware specific controller state structure
306 */
307 static void check_pending(struct bas_cardstate *ucs)
308 {
309 unsigned long flags;
310
311 IFNULLRET(ucs);
312 IFNULLRET(cardstate);
313
314 spin_lock_irqsave(&ucs->lock, flags);
315 switch (ucs->pending) {
316 case 0:
317 break;
318 case HD_OPEN_ATCHANNEL:
319 if (atomic_read(&ucs->basstate) & BS_ATOPEN)
320 ucs->pending = 0;
321 break;
322 case HD_OPEN_B1CHANNEL:
323 if (atomic_read(&ucs->basstate) & BS_B1OPEN)
324 ucs->pending = 0;
325 break;
326 case HD_OPEN_B2CHANNEL:
327 if (atomic_read(&ucs->basstate) & BS_B2OPEN)
328 ucs->pending = 0;
329 break;
330 case HD_CLOSE_ATCHANNEL:
331 if (!(atomic_read(&ucs->basstate) & BS_ATOPEN))
332 ucs->pending = 0;
333 //wake_up_interruptible(cs->initwait);
334 //FIXME need own wait queue?
335 break;
336 case HD_CLOSE_B1CHANNEL:
337 if (!(atomic_read(&ucs->basstate) & BS_B1OPEN))
338 ucs->pending = 0;
339 break;
340 case HD_CLOSE_B2CHANNEL:
341 if (!(atomic_read(&ucs->basstate) & BS_B2OPEN))
342 ucs->pending = 0;
343 break;
344 case HD_DEVICE_INIT_ACK: /* no reply expected */
345 ucs->pending = 0;
346 break;
347 /* HD_READ_ATMESSAGE, HD_WRITE_ATMESSAGE, HD_RESET_INTERRUPTPIPE
348 * are handled separately and should never end up here
349 */
350 default:
351 warn("unknown pending request 0x%02x cleared", ucs->pending);
352 ucs->pending = 0;
353 }
354
355 if (!ucs->pending)
356 del_timer(&ucs->timer_ctrl);
357
358 spin_unlock_irqrestore(&ucs->lock, flags);
359 }
360
361 /* cmd_in_timeout
362 * timeout routine for command input request
363 * argument:
364 * controller state structure
365 */
366 static void cmd_in_timeout(unsigned long data)
367 {
368 struct cardstate *cs = (struct cardstate *) data;
369 struct bas_cardstate *ucs;
370 unsigned long flags;
371
372 IFNULLRET(cs);
373 ucs = cs->hw.bas;
374 IFNULLRET(ucs);
375
376 spin_lock_irqsave(&cs->lock, flags);
377 if (!atomic_read(&cs->connected)) {
378 dbg(DEBUG_USBREQ, "%s: disconnected", __func__);
379 spin_unlock_irqrestore(&cs->lock, flags);
380 return;
381 }
382 if (!ucs->rcvbuf_size) {
383 dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
384 spin_unlock_irqrestore(&cs->lock, flags);
385 return;
386 }
387 spin_unlock_irqrestore(&cs->lock, flags);
388
389 err("timeout reading AT response");
390 error_reset(cs); //FIXME retry?
391 }
392
393
394 static void read_ctrl_callback(struct urb *urb, struct pt_regs *regs);
395
396 /* atread_submit
397 * submit an HD_READ_ATMESSAGE command URB
398 * parameters:
399 * cs controller state structure
400 * timeout timeout in 1/10 sec., 0: none
401 * return value:
402 * 0 on success
403 * -EINVAL if a NULL pointer is encountered somewhere
404 * -EBUSY if another request is pending
405 * any URB submission error code
406 */
407 static int atread_submit(struct cardstate *cs, int timeout)
408 {
409 struct bas_cardstate *ucs;
410 int ret;
411
412 IFNULLRETVAL(cs, -EINVAL);
413 ucs = cs->hw.bas;
414 IFNULLRETVAL(ucs, -EINVAL);
415 IFNULLRETVAL(ucs->urb_cmd_in, -EINVAL);
416
417 dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)", ucs->rcvbuf_size);
418
419 if (ucs->urb_cmd_in->status == -EINPROGRESS) {
420 err("could not submit HD_READ_ATMESSAGE: URB busy");
421 return -EBUSY;
422 }
423
424 ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
425 ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
426 ucs->dr_cmd_in.wValue = 0;
427 ucs->dr_cmd_in.wIndex = 0;
428 ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
429 usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
430 usb_rcvctrlpipe(ucs->udev, 0),
431 (unsigned char*) & ucs->dr_cmd_in,
432 ucs->rcvbuf, ucs->rcvbuf_size,
433 read_ctrl_callback, cs->inbuf);
434
435 if ((ret = usb_submit_urb(ucs->urb_cmd_in, SLAB_ATOMIC)) != 0) {
436 err("could not submit HD_READ_ATMESSAGE: %s",
437 get_usb_statmsg(ret));
438 return ret;
439 }
440
441 if (timeout > 0) {
442 dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
443 ucs->timer_cmd_in.expires = jiffies + timeout * HZ / 10;
444 ucs->timer_cmd_in.data = (unsigned long) cs;
445 ucs->timer_cmd_in.function = cmd_in_timeout;
446 add_timer(&ucs->timer_cmd_in);
447 }
448 return 0;
449 }
450
451 static void stopurbs(struct bas_bc_state *);
452 static int start_cbsend(struct cardstate *);
453
454 /* set/clear bits in base connection state
455 */
456 inline static void update_basstate(struct bas_cardstate *ucs,
457 int set, int clear)
458 {
459 unsigned long flags;
460 int state;
461
462 spin_lock_irqsave(&ucs->lock, flags);
463 state = atomic_read(&ucs->basstate);
464 state &= ~clear;
465 state |= set;
466 atomic_set(&ucs->basstate, state);
467 spin_unlock_irqrestore(&ucs->lock, flags);
468 }
469
470
471 /* read_int_callback
472 * USB completion handler for interrupt pipe input
473 * called by the USB subsystem in interrupt context
474 * parameter:
475 * urb USB request block
476 * urb->context = controller state structure
477 */
478 static void read_int_callback(struct urb *urb, struct pt_regs *regs)
479 {
480 struct cardstate *cs;
481 struct bas_cardstate *ucs;
482 struct bc_state *bcs;
483 unsigned long flags;
484 int status;
485 unsigned l;
486 int channel;
487
488 IFNULLRET(urb);
489 cs = (struct cardstate *) urb->context;
490 IFNULLRET(cs);
491 ucs = cs->hw.bas;
492 IFNULLRET(ucs);
493
494 if (unlikely(!atomic_read(&cs->connected))) {
495 warn("%s: disconnected", __func__);
496 return;
497 }
498
499 switch (urb->status) {
500 case 0: /* success */
501 break;
502 case -ENOENT: /* canceled */
503 case -ECONNRESET: /* canceled (async) */
504 case -EINPROGRESS: /* pending */
505 /* ignore silently */
506 dbg(DEBUG_USBREQ,
507 "%s: %s", __func__, get_usb_statmsg(urb->status));
508 return;
509 default: /* severe trouble */
510 warn("interrupt read: %s", get_usb_statmsg(urb->status));
511 //FIXME corrective action? resubmission always ok?
512 goto resubmit;
513 }
514
515 l = (unsigned) ucs->int_in_buf[1] +
516 (((unsigned) ucs->int_in_buf[2]) << 8);
517
518 dbg(DEBUG_USBREQ,
519 "<-------%d: 0x%02x (%u [0x%02x 0x%02x])", urb->actual_length,
520 (int)ucs->int_in_buf[0], l,
521 (int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
522
523 channel = 0;
524
525 switch (ucs->int_in_buf[0]) {
526 case HD_DEVICE_INIT_OK:
527 update_basstate(ucs, BS_INIT, 0);
528 break;
529
530 case HD_READY_SEND_ATDATA:
531 del_timer(&ucs->timer_atrdy);
532 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
533 start_cbsend(cs);
534 break;
535
536 case HD_OPEN_B2CHANNEL_ACK:
537 ++channel;
538 case HD_OPEN_B1CHANNEL_ACK:
539 bcs = cs->bcs + channel;
540 update_basstate(ucs, BS_B1OPEN << channel, 0);
541 gigaset_bchannel_up(bcs);
542 break;
543
544 case HD_OPEN_ATCHANNEL_ACK:
545 update_basstate(ucs, BS_ATOPEN, 0);
546 start_cbsend(cs);
547 break;
548
549 case HD_CLOSE_B2CHANNEL_ACK:
550 ++channel;
551 case HD_CLOSE_B1CHANNEL_ACK:
552 bcs = cs->bcs + channel;
553 update_basstate(ucs, 0, BS_B1OPEN << channel);
554 stopurbs(bcs->hw.bas);
555 gigaset_bchannel_down(bcs);
556 break;
557
558 case HD_CLOSE_ATCHANNEL_ACK:
559 update_basstate(ucs, 0, BS_ATOPEN);
560 break;
561
562 case HD_B2_FLOW_CONTROL:
563 ++channel;
564 case HD_B1_FLOW_CONTROL:
565 bcs = cs->bcs + channel;
566 atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
567 &bcs->hw.bas->corrbytes);
568 dbg(DEBUG_ISO,
569 "Flow control (channel %d, sub %d): 0x%02x => %d",
570 channel, bcs->hw.bas->numsub, l,
571 atomic_read(&bcs->hw.bas->corrbytes));
572 break;
573
574 case HD_RECEIVEATDATA_ACK: /* AT response ready to be received */
575 if (!l) {
576 warn("HD_RECEIVEATDATA_ACK with length 0 ignored");
577 break;
578 }
579 spin_lock_irqsave(&cs->lock, flags);
580 if (ucs->rcvbuf_size) {
581 spin_unlock_irqrestore(&cs->lock, flags);
582 err("receive AT data overrun, %d bytes lost", l);
583 error_reset(cs); //FIXME reschedule
584 break;
585 }
586 if ((ucs->rcvbuf = kmalloc(l, GFP_ATOMIC)) == NULL) {
587 spin_unlock_irqrestore(&cs->lock, flags);
588 err("%s: out of memory, %d bytes lost", __func__, l);
589 error_reset(cs); //FIXME reschedule
590 break;
591 }
592 ucs->rcvbuf_size = l;
593 ucs->retry_cmd_in = 0;
594 if ((status = atread_submit(cs, BAS_TIMEOUT)) < 0) {
595 kfree(ucs->rcvbuf);
596 ucs->rcvbuf = NULL;
597 ucs->rcvbuf_size = 0;
598 error_reset(cs); //FIXME reschedule
599 }
600 spin_unlock_irqrestore(&cs->lock, flags);
601 break;
602
603 case HD_RESET_INTERRUPT_PIPE_ACK:
604 dbg(DEBUG_USBREQ, "HD_RESET_INTERRUPT_PIPE_ACK");
605 break;
606
607 case HD_SUSPEND_END:
608 dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
609 break;
610
611 default:
612 warn("unknown Gigaset signal 0x%02x (%u) ignored",
613 (int) ucs->int_in_buf[0], l);
614 }
615
616 check_pending(ucs);
617
618 resubmit:
619 status = usb_submit_urb(urb, SLAB_ATOMIC);
620 if (unlikely(status)) {
621 err("could not resubmit interrupt URB: %s",
622 get_usb_statmsg(status));
623 error_reset(cs);
624 }
625 }
626
627 /* read_ctrl_callback
628 * USB completion handler for control pipe input
629 * called by the USB subsystem in interrupt context
630 * parameter:
631 * urb USB request block
632 * urb->context = inbuf structure for controller state
633 */
634 static void read_ctrl_callback(struct urb *urb, struct pt_regs *regs)
635 {
636 struct cardstate *cs;
637 struct bas_cardstate *ucs;
638 unsigned numbytes;
639 unsigned long flags;
640 struct inbuf_t *inbuf;
641 int have_data = 0;
642
643 IFNULLRET(urb);
644 inbuf = (struct inbuf_t *) urb->context;
645 IFNULLRET(inbuf);
646 cs = inbuf->cs;
647 IFNULLRET(cs);
648 ucs = cs->hw.bas;
649 IFNULLRET(ucs);
650
651 spin_lock_irqsave(&cs->lock, flags);
652 if (!atomic_read(&cs->connected)) {
653 warn("%s: disconnected", __func__);
654 spin_unlock_irqrestore(&cs->lock, flags);
655 return;
656 }
657
658 if (!ucs->rcvbuf_size) {
659 warn("%s: no receive in progress", __func__);
660 spin_unlock_irqrestore(&cs->lock, flags);
661 return;
662 }
663
664 del_timer(&ucs->timer_cmd_in);
665
666 switch (urb->status) {
667 case 0: /* normal completion */
668 numbytes = urb->actual_length;
669 if (unlikely(numbytes == 0)) {
670 warn("control read: empty block received");
671 goto retry;
672 }
673 if (unlikely(numbytes != ucs->rcvbuf_size)) {
674 warn("control read: received %d chars, expected %d",
675 numbytes, ucs->rcvbuf_size);
676 if (numbytes > ucs->rcvbuf_size)
677 numbytes = ucs->rcvbuf_size;
678 }
679
680 /* copy received bytes to inbuf */
681 have_data = gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes);
682
683 if (unlikely(numbytes < ucs->rcvbuf_size)) {
684 /* incomplete - resubmit for remaining bytes */
685 ucs->rcvbuf_size -= numbytes;
686 ucs->retry_cmd_in = 0;
687 goto retry;
688 }
689 break;
690
691 case -ENOENT: /* canceled */
692 case -ECONNRESET: /* canceled (async) */
693 case -EINPROGRESS: /* pending */
694 /* no action necessary */
695 dbg(DEBUG_USBREQ,
696 "%s: %s", __func__, get_usb_statmsg(urb->status));
697 break;
698
699 default: /* severe trouble */
700 warn("control read: %s", get_usb_statmsg(urb->status));
701 retry:
702 if (ucs->retry_cmd_in++ < BAS_RETRY) {
703 notice("control read: retry %d", ucs->retry_cmd_in);
704 if (atread_submit(cs, BAS_TIMEOUT) >= 0) {
705 /* resubmitted - bypass regular exit block */
706 spin_unlock_irqrestore(&cs->lock, flags);
707 return;
708 }
709 } else {
710 err("control read: giving up after %d tries",
711 ucs->retry_cmd_in);
712 }
713 error_reset(cs);
714 }
715
716 kfree(ucs->rcvbuf);
717 ucs->rcvbuf = NULL;
718 ucs->rcvbuf_size = 0;
719 spin_unlock_irqrestore(&cs->lock, flags);
720 if (have_data) {
721 dbg(DEBUG_INTR, "%s-->BH", __func__);
722 gigaset_schedule_event(cs);
723 }
724 }
725
726 /* read_iso_callback
727 * USB completion handler for B channel isochronous input
728 * called by the USB subsystem in interrupt context
729 * parameter:
730 * urb USB request block of completed request
731 * urb->context = bc_state structure
732 */
733 static void read_iso_callback(struct urb *urb, struct pt_regs *regs)
734 {
735 struct bc_state *bcs;
736 struct bas_bc_state *ubc;
737 unsigned long flags;
738 int i, rc;
739
740 IFNULLRET(urb);
741 IFNULLRET(urb->context);
742 IFNULLRET(cardstate);
743
744 /* status codes not worth bothering the tasklet with */
745 if (unlikely(urb->status == -ENOENT || urb->status == -ECONNRESET ||
746 urb->status == -EINPROGRESS)) {
747 dbg(DEBUG_ISO,
748 "%s: %s", __func__, get_usb_statmsg(urb->status));
749 return;
750 }
751
752 bcs = (struct bc_state *) urb->context;
753 ubc = bcs->hw.bas;
754 IFNULLRET(ubc);
755
756 spin_lock_irqsave(&ubc->isoinlock, flags);
757 if (likely(ubc->isoindone == NULL)) {
758 /* pass URB to tasklet */
759 ubc->isoindone = urb;
760 tasklet_schedule(&ubc->rcvd_tasklet);
761 } else {
762 /* tasklet still busy, drop data and resubmit URB */
763 ubc->loststatus = urb->status;
764 for (i = 0; i < BAS_NUMFRAMES; i++) {
765 ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
766 if (unlikely(urb->iso_frame_desc[i].status != 0 &&
767 urb->iso_frame_desc[i].status != -EINPROGRESS)) {
768 ubc->loststatus = urb->iso_frame_desc[i].status;
769 }
770 urb->iso_frame_desc[i].status = 0;
771 urb->iso_frame_desc[i].actual_length = 0;
772 }
773 if (likely(atomic_read(&ubc->running))) {
774 urb->dev = bcs->cs->hw.bas->udev; /* clobbered by USB subsystem */
775 urb->transfer_flags = URB_ISO_ASAP;
776 urb->number_of_packets = BAS_NUMFRAMES;
777 dbg(DEBUG_ISO, "%s: isoc read overrun/resubmit",
778 __func__);
779 rc = usb_submit_urb(urb, SLAB_ATOMIC);
780 if (unlikely(rc != 0)) {
781 err("could not resubmit isochronous read URB: %s",
782 get_usb_statmsg(rc));
783 dump_urb(DEBUG_ISO, "isoc read", urb);
784 error_hangup(bcs);
785 }
786 }
787 }
788 spin_unlock_irqrestore(&ubc->isoinlock, flags);
789 }
790
791 /* write_iso_callback
792 * USB completion handler for B channel isochronous output
793 * called by the USB subsystem in interrupt context
794 * parameter:
795 * urb USB request block of completed request
796 * urb->context = isow_urbctx_t structure
797 */
798 static void write_iso_callback(struct urb *urb, struct pt_regs *regs)
799 {
800 struct isow_urbctx_t *ucx;
801 struct bas_bc_state *ubc;
802 unsigned long flags;
803
804 IFNULLRET(urb);
805 IFNULLRET(urb->context);
806 IFNULLRET(cardstate);
807
808 /* status codes not worth bothering the tasklet with */
809 if (unlikely(urb->status == -ENOENT || urb->status == -ECONNRESET ||
810 urb->status == -EINPROGRESS)) {
811 dbg(DEBUG_ISO,
812 "%s: %s", __func__, get_usb_statmsg(urb->status));
813 return;
814 }
815
816 /* pass URB context to tasklet */
817 ucx = (struct isow_urbctx_t *) urb->context;
818 IFNULLRET(ucx->bcs);
819 ubc = ucx->bcs->hw.bas;
820 IFNULLRET(ubc);
821
822 spin_lock_irqsave(&ubc->isooutlock, flags);
823 ubc->isooutovfl = ubc->isooutdone;
824 ubc->isooutdone = ucx;
825 spin_unlock_irqrestore(&ubc->isooutlock, flags);
826 tasklet_schedule(&ubc->sent_tasklet);
827 }
828
829 /* starturbs
830 * prepare and submit USB request blocks for isochronous input and output
831 * argument:
832 * B channel control structure
833 * return value:
834 * 0 on success
835 * < 0 on error (no URBs submitted)
836 */
837 static int starturbs(struct bc_state *bcs)
838 {
839 struct urb *urb;
840 struct bas_bc_state *ubc;
841 int j, k;
842 int rc;
843
844 IFNULLRETVAL(bcs, -EFAULT);
845 ubc = bcs->hw.bas;
846 IFNULLRETVAL(ubc, -EFAULT);
847
848 /* initialize L2 reception */
849 if (bcs->proto2 == ISDN_PROTO_L2_HDLC)
850 bcs->inputstate |= INS_flag_hunt;
851
852 /* submit all isochronous input URBs */
853 atomic_set(&ubc->running, 1);
854 for (k = 0; k < BAS_INURBS; k++) {
855 urb = ubc->isoinurbs[k];
856 if (!urb) {
857 err("isoinurbs[%d]==NULL", k);
858 rc = -EFAULT;
859 goto error;
860 }
861
862 urb->dev = bcs->cs->hw.bas->udev;
863 urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
864 urb->transfer_flags = URB_ISO_ASAP;
865 urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
866 urb->transfer_buffer_length = BAS_INBUFSIZE;
867 urb->number_of_packets = BAS_NUMFRAMES;
868 urb->interval = BAS_FRAMETIME;
869 urb->complete = read_iso_callback;
870 urb->context = bcs;
871 for (j = 0; j < BAS_NUMFRAMES; j++) {
872 urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
873 urb->iso_frame_desc[j].length = BAS_MAXFRAME;
874 urb->iso_frame_desc[j].status = 0;
875 urb->iso_frame_desc[j].actual_length = 0;
876 }
877
878 dump_urb(DEBUG_ISO, "Initial isoc read", urb);
879 if ((rc = usb_submit_urb(urb, SLAB_ATOMIC)) != 0) {
880 err("could not submit isochronous read URB %d: %s",
881 k, get_usb_statmsg(rc));
882 goto error;
883 }
884 }
885
886 /* initialize L2 transmission */
887 gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
888
889 /* set up isochronous output URBs for flag idling */
890 for (k = 0; k < BAS_OUTURBS; ++k) {
891 urb = ubc->isoouturbs[k].urb;
892 if (!urb) {
893 err("isoouturbs[%d].urb==NULL", k);
894 rc = -EFAULT;
895 goto error;
896 }
897 urb->dev = bcs->cs->hw.bas->udev;
898 urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
899 urb->transfer_flags = URB_ISO_ASAP;
900 urb->transfer_buffer = ubc->isooutbuf->data;
901 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
902 urb->number_of_packets = BAS_NUMFRAMES;
903 urb->interval = BAS_FRAMETIME;
904 urb->complete = write_iso_callback;
905 urb->context = &ubc->isoouturbs[k];
906 for (j = 0; j < BAS_NUMFRAMES; ++j) {
907 urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
908 urb->iso_frame_desc[j].length = BAS_NORMFRAME;
909 urb->iso_frame_desc[j].status = 0;
910 urb->iso_frame_desc[j].actual_length = 0;
911 }
912 ubc->isoouturbs[k].limit = -1;
913 }
914
915 /* submit two URBs, keep third one */
916 for (k = 0; k < 2; ++k) {
917 dump_urb(DEBUG_ISO, "Initial isoc write", urb);
918 rc = usb_submit_urb(ubc->isoouturbs[k].urb, SLAB_ATOMIC);
919 if (rc != 0) {
920 err("could not submit isochronous write URB %d: %s",
921 k, get_usb_statmsg(rc));
922 goto error;
923 }
924 }
925 dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
926 ubc->isooutfree = &ubc->isoouturbs[2];
927 ubc->isooutdone = ubc->isooutovfl = NULL;
928 return 0;
929 error:
930 stopurbs(ubc);
931 return rc;
932 }
933
934 /* stopurbs
935 * cancel the USB request blocks for isochronous input and output
936 * errors are silently ignored
937 * argument:
938 * B channel control structure
939 */
940 static void stopurbs(struct bas_bc_state *ubc)
941 {
942 int k, rc;
943
944 IFNULLRET(ubc);
945
946 atomic_set(&ubc->running, 0);
947
948 for (k = 0; k < BAS_INURBS; ++k) {
949 rc = usb_unlink_urb(ubc->isoinurbs[k]);
950 dbg(DEBUG_ISO, "%s: isoc input URB %d unlinked, result = %d",
951 __func__, k, rc);
952 }
953
954 for (k = 0; k < BAS_OUTURBS; ++k) {
955 rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
956 dbg(DEBUG_ISO, "%s: isoc output URB %d unlinked, result = %d",
957 __func__, k, rc);
958 }
959 }
960
961 /* Isochronous Write - Bottom Half */
962 /* =============================== */
963
964 /* submit_iso_write_urb
965 * fill and submit the next isochronous write URB
966 * parameters:
967 * bcs B channel state structure
968 * return value:
969 * number of frames submitted in URB
970 * 0 if URB not submitted because no data available (isooutbuf busy)
971 * error code < 0 on error
972 */
973 static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
974 {
975 struct urb *urb;
976 struct bas_bc_state *ubc;
977 struct usb_iso_packet_descriptor *ifd;
978 int corrbytes, nframe, rc;
979
980 IFNULLRETVAL(ucx, -EFAULT);
981 urb = ucx->urb;
982 IFNULLRETVAL(urb, -EFAULT);
983 IFNULLRETVAL(ucx->bcs, -EFAULT);
984 ubc = ucx->bcs->hw.bas;
985 IFNULLRETVAL(ubc, -EFAULT);
986
987 urb->dev = ucx->bcs->cs->hw.bas->udev; /* clobbered by USB subsystem */
988 urb->transfer_flags = URB_ISO_ASAP;
989 urb->transfer_buffer = ubc->isooutbuf->data;
990 urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
991
992 for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
993 ifd = &urb->iso_frame_desc[nframe];
994
995 /* compute frame length according to flow control */
996 ifd->length = BAS_NORMFRAME;
997 if ((corrbytes = atomic_read(&ubc->corrbytes)) != 0) {
998 dbg(DEBUG_ISO, "%s: corrbytes=%d", __func__, corrbytes);
999 if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
1000 corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
1001 else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
1002 corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
1003 ifd->length += corrbytes;
1004 atomic_add(-corrbytes, &ubc->corrbytes);
1005 }
1006 //dbg(DEBUG_ISO, "%s: frame %d length=%d", __func__, nframe, ifd->length);
1007
1008 /* retrieve block of data to send */
1009 ifd->offset = gigaset_isowbuf_getbytes(ubc->isooutbuf,
1010 ifd->length);
1011 if (ifd->offset < 0) {
1012 if (ifd->offset == -EBUSY) {
1013 dbg(DEBUG_ISO, "%s: buffer busy at frame %d",
1014 __func__, nframe);
1015 /* tasklet will be restarted from gigaset_send_skb() */
1016 } else {
1017 err("%s: buffer error %d at frame %d",
1018 __func__, ifd->offset, nframe);
1019 return ifd->offset;
1020 }
1021 break;
1022 }
1023 ucx->limit = atomic_read(&ubc->isooutbuf->nextread);
1024 ifd->status = 0;
1025 ifd->actual_length = 0;
1026 }
1027 if ((urb->number_of_packets = nframe) > 0) {
1028 if ((rc = usb_submit_urb(urb, SLAB_ATOMIC)) != 0) {
1029 err("could not submit isochronous write URB: %s",
1030 get_usb_statmsg(rc));
1031 dump_urb(DEBUG_ISO, "isoc write", urb);
1032 return rc;
1033 }
1034 ++ubc->numsub;
1035 }
1036 return nframe;
1037 }
1038
1039 /* write_iso_tasklet
1040 * tasklet scheduled when an isochronous output URB from the Gigaset device
1041 * has completed
1042 * parameter:
1043 * data B channel state structure
1044 */
1045 static void write_iso_tasklet(unsigned long data)
1046 {
1047 struct bc_state *bcs;
1048 struct bas_bc_state *ubc;
1049 struct cardstate *cs;
1050 struct isow_urbctx_t *done, *next, *ovfl;
1051 struct urb *urb;
1052 struct usb_iso_packet_descriptor *ifd;
1053 int offset;
1054 unsigned long flags;
1055 int i;
1056 struct sk_buff *skb;
1057 int len;
1058
1059 bcs = (struct bc_state *) data;
1060 IFNULLRET(bcs);
1061 ubc = bcs->hw.bas;
1062 IFNULLRET(ubc);
1063 cs = bcs->cs;
1064 IFNULLRET(cs);
1065
1066 /* loop while completed URBs arrive in time */
1067 for (;;) {
1068 if (unlikely(!atomic_read(&cs->connected))) {
1069 warn("%s: disconnected", __func__);
1070 return;
1071 }
1072
1073 if (unlikely(!(atomic_read(&ubc->running)))) {
1074 dbg(DEBUG_ISO, "%s: not running", __func__);
1075 return;
1076 }
1077
1078 /* retrieve completed URBs */
1079 spin_lock_irqsave(&ubc->isooutlock, flags);
1080 done = ubc->isooutdone;
1081 ubc->isooutdone = NULL;
1082 ovfl = ubc->isooutovfl;
1083 ubc->isooutovfl = NULL;
1084 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1085 if (ovfl) {
1086 err("isochronous write buffer underrun - buy a faster machine :-)");
1087 error_hangup(bcs);
1088 break;
1089 }
1090 if (!done)
1091 break;
1092
1093 /* submit free URB if available */
1094 spin_lock_irqsave(&ubc->isooutlock, flags);
1095 next = ubc->isooutfree;
1096 ubc->isooutfree = NULL;
1097 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1098 if (next) {
1099 if (submit_iso_write_urb(next) <= 0) {
1100 /* could not submit URB, put it back */
1101 spin_lock_irqsave(&ubc->isooutlock, flags);
1102 if (ubc->isooutfree == NULL) {
1103 ubc->isooutfree = next;
1104 next = NULL;
1105 }
1106 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1107 if (next) {
1108 /* couldn't put it back */
1109 err("losing isochronous write URB");
1110 error_hangup(bcs);
1111 }
1112 }
1113 }
1114
1115 /* process completed URB */
1116 urb = done->urb;
1117 switch (urb->status) {
1118 case 0: /* normal completion */
1119 break;
1120 case -EXDEV: /* inspect individual frames */
1121 /* assumptions (for lack of documentation):
1122 * - actual_length bytes of the frame in error are
1123 * successfully sent
1124 * - all following frames are not sent at all
1125 */
1126 dbg(DEBUG_ISO, "%s: URB partially completed", __func__);
1127 offset = done->limit; /* just in case */
1128 for (i = 0; i < BAS_NUMFRAMES; i++) {
1129 ifd = &urb->iso_frame_desc[i];
1130 if (ifd->status ||
1131 ifd->actual_length != ifd->length) {
1132 warn("isochronous write: frame %d: %s, "
1133 "only %d of %d bytes sent",
1134 i, get_usb_statmsg(ifd->status),
1135 ifd->actual_length, ifd->length);
1136 offset = (ifd->offset +
1137 ifd->actual_length)
1138 % BAS_OUTBUFSIZE;
1139 break;
1140 }
1141 }
1142 #ifdef CONFIG_GIGASET_DEBUG
1143 /* check assumption on remaining frames */
1144 for (; i < BAS_NUMFRAMES; i++) {
1145 ifd = &urb->iso_frame_desc[i];
1146 if (ifd->status != -EINPROGRESS
1147 || ifd->actual_length != 0) {
1148 warn("isochronous write: frame %d: %s, "
1149 "%d of %d bytes sent",
1150 i, get_usb_statmsg(ifd->status),
1151 ifd->actual_length, ifd->length);
1152 offset = (ifd->offset +
1153 ifd->actual_length)
1154 % BAS_OUTBUFSIZE;
1155 break;
1156 }
1157 }
1158 #endif
1159 break;
1160 case -EPIPE: //FIXME is this the code for "underrun"?
1161 err("isochronous write stalled");
1162 error_hangup(bcs);
1163 break;
1164 default: /* severe trouble */
1165 warn("isochronous write: %s",
1166 get_usb_statmsg(urb->status));
1167 }
1168
1169 /* mark the write buffer area covered by this URB as free */
1170 if (done->limit >= 0)
1171 atomic_set(&ubc->isooutbuf->read, done->limit);
1172
1173 /* mark URB as free */
1174 spin_lock_irqsave(&ubc->isooutlock, flags);
1175 next = ubc->isooutfree;
1176 ubc->isooutfree = done;
1177 spin_unlock_irqrestore(&ubc->isooutlock, flags);
1178 if (next) {
1179 /* only one URB still active - resubmit one */
1180 if (submit_iso_write_urb(next) <= 0) {
1181 /* couldn't submit */
1182 error_hangup(bcs);
1183 }
1184 }
1185 }
1186
1187 /* process queued SKBs */
1188 while ((skb = skb_dequeue(&bcs->squeue))) {
1189 /* copy to output buffer, doing L2 encapsulation */
1190 len = skb->len;
1191 if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
1192 /* insufficient buffer space, push back onto queue */
1193 skb_queue_head(&bcs->squeue, skb);
1194 dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
1195 __func__, skb_queue_len(&bcs->squeue));
1196 break;
1197 }
1198 skb_pull(skb, len);
1199 gigaset_skb_sent(bcs, skb);
1200 dev_kfree_skb_any(skb);
1201 }
1202 }
1203
1204 /* Isochronous Read - Bottom Half */
1205 /* ============================== */
1206
1207 /* read_iso_tasklet
1208 * tasklet scheduled when an isochronous input URB from the Gigaset device
1209 * has completed
1210 * parameter:
1211 * data B channel state structure
1212 */
1213 static void read_iso_tasklet(unsigned long data)
1214 {
1215 struct bc_state *bcs;
1216 struct bas_bc_state *ubc;
1217 struct cardstate *cs;
1218 struct urb *urb;
1219 char *rcvbuf;
1220 unsigned long flags;
1221 int totleft, numbytes, offset, frame, rc;
1222
1223 bcs = (struct bc_state *) data;
1224 IFNULLRET(bcs);
1225 ubc = bcs->hw.bas;
1226 IFNULLRET(ubc);
1227 cs = bcs->cs;
1228 IFNULLRET(cs);
1229
1230 /* loop while more completed URBs arrive in the meantime */
1231 for (;;) {
1232 if (!atomic_read(&cs->connected)) {
1233 warn("%s: disconnected", __func__);
1234 return;
1235 }
1236
1237 /* retrieve URB */
1238 spin_lock_irqsave(&ubc->isoinlock, flags);
1239 if (!(urb = ubc->isoindone)) {
1240 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1241 return;
1242 }
1243 ubc->isoindone = NULL;
1244 if (unlikely(ubc->loststatus != -EINPROGRESS)) {
1245 warn("isochronous read overrun, dropped URB with status: %s, %d bytes lost",
1246 get_usb_statmsg(ubc->loststatus), ubc->isoinlost);
1247 ubc->loststatus = -EINPROGRESS;
1248 }
1249 spin_unlock_irqrestore(&ubc->isoinlock, flags);
1250
1251 if (unlikely(!(atomic_read(&ubc->running)))) {
1252 dbg(DEBUG_ISO, "%s: channel not running, dropped URB with status: %s",
1253 __func__, get_usb_statmsg(urb->status));
1254 return;
1255 }
1256
1257 switch (urb->status) {
1258 case 0: /* normal completion */
1259 break;
1260 case -EXDEV: /* inspect individual frames
1261 (we do that anyway) */
1262 dbg(DEBUG_ISO, "%s: URB partially completed", __func__);
1263 break;
1264 case -ENOENT:
1265 case -ECONNRESET:
1266 dbg(DEBUG_ISO, "%s: URB canceled", __func__);
1267 continue; /* -> skip */
1268 case -EINPROGRESS: /* huh? */
1269 dbg(DEBUG_ISO, "%s: URB still pending", __func__);
1270 continue; /* -> skip */
1271 case -EPIPE:
1272 err("isochronous read stalled");
1273 error_hangup(bcs);
1274 continue; /* -> skip */
1275 default: /* severe trouble */
1276 warn("isochronous read: %s",
1277 get_usb_statmsg(urb->status));
1278 goto error;
1279 }
1280
1281 rcvbuf = urb->transfer_buffer;
1282 totleft = urb->actual_length;
1283 for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
1284 if (unlikely(urb->iso_frame_desc[frame].status)) {
1285 warn("isochronous read: frame %d: %s", frame,
1286 get_usb_statmsg(urb->iso_frame_desc[frame].status));
1287 break;
1288 }
1289 numbytes = urb->iso_frame_desc[frame].actual_length;
1290 if (unlikely(numbytes > BAS_MAXFRAME)) {
1291 warn("isochronous read: frame %d: numbytes (%d) > BAS_MAXFRAME",
1292 frame, numbytes);
1293 break;
1294 }
1295 if (unlikely(numbytes > totleft)) {
1296 warn("isochronous read: frame %d: numbytes (%d) > totleft (%d)",
1297 frame, numbytes, totleft);
1298 break;
1299 }
1300 offset = urb->iso_frame_desc[frame].offset;
1301 if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
1302 warn("isochronous read: frame %d: offset (%d) + numbytes (%d) > BAS_INBUFSIZE",
1303 frame, offset, numbytes);
1304 break;
1305 }
1306 gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
1307 totleft -= numbytes;
1308 }
1309 if (unlikely(totleft > 0))
1310 warn("isochronous read: %d data bytes missing",
1311 totleft);
1312
1313 error:
1314 /* URB processed, resubmit */
1315 for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
1316 urb->iso_frame_desc[frame].status = 0;
1317 urb->iso_frame_desc[frame].actual_length = 0;
1318 }
1319 urb->dev = bcs->cs->hw.bas->udev; /* clobbered by USB subsystem */
1320 urb->transfer_flags = URB_ISO_ASAP;
1321 urb->number_of_packets = BAS_NUMFRAMES;
1322 if ((rc = usb_submit_urb(urb, SLAB_ATOMIC)) != 0) {
1323 err("could not resubmit isochronous read URB: %s",
1324 get_usb_statmsg(rc));
1325 dump_urb(DEBUG_ISO, "resubmit iso read", urb);
1326 error_hangup(bcs);
1327 }
1328 }
1329 }
1330
1331 /* Channel Operations */
1332 /* ================== */
1333
1334 /* req_timeout
1335 * timeout routine for control output request
1336 * argument:
1337 * B channel control structure
1338 */
1339 static void req_timeout(unsigned long data)
1340 {
1341 struct bc_state *bcs = (struct bc_state *) data;
1342 struct bas_cardstate *ucs;
1343 int pending;
1344 unsigned long flags;
1345
1346 IFNULLRET(bcs);
1347 IFNULLRET(bcs->cs);
1348 ucs = bcs->cs->hw.bas;
1349 IFNULLRET(ucs);
1350
1351 check_pending(ucs);
1352
1353 spin_lock_irqsave(&ucs->lock, flags);
1354 pending = ucs->pending;
1355 ucs->pending = 0;
1356 spin_unlock_irqrestore(&ucs->lock, flags);
1357
1358 switch (pending) {
1359 case 0: /* no pending request */
1360 dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
1361 break;
1362
1363 case HD_OPEN_ATCHANNEL:
1364 err("timeout opening AT channel");
1365 error_reset(bcs->cs);
1366 break;
1367
1368 case HD_OPEN_B2CHANNEL:
1369 case HD_OPEN_B1CHANNEL:
1370 err("timeout opening channel %d", bcs->channel + 1);
1371 error_hangup(bcs);
1372 break;
1373
1374 case HD_CLOSE_ATCHANNEL:
1375 err("timeout closing AT channel");
1376 //wake_up_interruptible(cs->initwait);
1377 //FIXME need own wait queue?
1378 break;
1379
1380 case HD_CLOSE_B2CHANNEL:
1381 case HD_CLOSE_B1CHANNEL:
1382 err("timeout closing channel %d", bcs->channel + 1);
1383 break;
1384
1385 default:
1386 warn("request 0x%02x timed out, clearing", pending);
1387 }
1388 }
1389
1390 /* write_ctrl_callback
1391 * USB completion handler for control pipe output
1392 * called by the USB subsystem in interrupt context
1393 * parameter:
1394 * urb USB request block of completed request
1395 * urb->context = hardware specific controller state structure
1396 */
1397 static void write_ctrl_callback(struct urb *urb, struct pt_regs *regs)
1398 {
1399 struct bas_cardstate *ucs;
1400 unsigned long flags;
1401
1402 IFNULLRET(urb);
1403 IFNULLRET(urb->context);
1404 IFNULLRET(cardstate);
1405
1406 ucs = (struct bas_cardstate *) urb->context;
1407 spin_lock_irqsave(&ucs->lock, flags);
1408 if (urb->status && ucs->pending) {
1409 err("control request 0x%02x failed: %s",
1410 ucs->pending, get_usb_statmsg(urb->status));
1411 del_timer(&ucs->timer_ctrl);
1412 ucs->pending = 0;
1413 }
1414 /* individual handling of specific request types */
1415 switch (ucs->pending) {
1416 case HD_DEVICE_INIT_ACK: /* no reply expected */
1417 ucs->pending = 0;
1418 break;
1419 }
1420 spin_unlock_irqrestore(&ucs->lock, flags);
1421 }
1422
1423 /* req_submit
1424 * submit a control output request without message buffer to the Gigaset base
1425 * and optionally start a timeout
1426 * parameters:
1427 * bcs B channel control structure
1428 * req control request code (HD_*)
1429 * val control request parameter value (set to 0 if unused)
1430 * timeout timeout in seconds (0: no timeout)
1431 * return value:
1432 * 0 on success
1433 * -EINVAL if a NULL pointer is encountered somewhere
1434 * -EBUSY if another request is pending
1435 * any URB submission error code
1436 */
1437 static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
1438 {
1439 struct bas_cardstate *ucs;
1440 int ret;
1441 unsigned long flags;
1442
1443 IFNULLRETVAL(bcs, -EINVAL);
1444 IFNULLRETVAL(bcs->cs, -EINVAL);
1445 ucs = bcs->cs->hw.bas;
1446 IFNULLRETVAL(ucs, -EINVAL);
1447 IFNULLRETVAL(ucs->urb_ctrl, -EINVAL);
1448
1449 dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
1450
1451 spin_lock_irqsave(&ucs->lock, flags);
1452 if (ucs->pending) {
1453 spin_unlock_irqrestore(&ucs->lock, flags);
1454 err("submission of request 0x%02x failed: request 0x%02x still pending",
1455 req, ucs->pending);
1456 return -EBUSY;
1457 }
1458 if (ucs->urb_ctrl->status == -EINPROGRESS) {
1459 spin_unlock_irqrestore(&ucs->lock, flags);
1460 err("could not submit request 0x%02x: URB busy", req);
1461 return -EBUSY;
1462 }
1463
1464 ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
1465 ucs->dr_ctrl.bRequest = req;
1466 ucs->dr_ctrl.wValue = cpu_to_le16(val);
1467 ucs->dr_ctrl.wIndex = 0;
1468 ucs->dr_ctrl.wLength = 0;
1469 usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
1470 usb_sndctrlpipe(ucs->udev, 0),
1471 (unsigned char*) &ucs->dr_ctrl, NULL, 0,
1472 write_ctrl_callback, ucs);
1473 if ((ret = usb_submit_urb(ucs->urb_ctrl, SLAB_ATOMIC)) != 0) {
1474 err("could not submit request 0x%02x: %s",
1475 req, get_usb_statmsg(ret));
1476 spin_unlock_irqrestore(&ucs->lock, flags);
1477 return ret;
1478 }
1479 ucs->pending = req;
1480
1481 if (timeout > 0) {
1482 dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
1483 ucs->timer_ctrl.expires = jiffies + timeout * HZ / 10;
1484 ucs->timer_ctrl.data = (unsigned long) bcs;
1485 ucs->timer_ctrl.function = req_timeout;
1486 add_timer(&ucs->timer_ctrl);
1487 }
1488
1489 spin_unlock_irqrestore(&ucs->lock, flags);
1490 return 0;
1491 }
1492
1493 /* gigaset_init_bchannel
1494 * called by common.c to connect a B channel
1495 * initialize isochronous I/O and tell the Gigaset base to open the channel
1496 * argument:
1497 * B channel control structure
1498 * return value:
1499 * 0 on success, error code < 0 on error
1500 */
1501 static int gigaset_init_bchannel(struct bc_state *bcs)
1502 {
1503 int req, ret;
1504
1505 IFNULLRETVAL(bcs, -EINVAL);
1506
1507 if ((ret = starturbs(bcs)) < 0) {
1508 err("could not start isochronous I/O for channel %d",
1509 bcs->channel + 1);
1510 error_hangup(bcs);
1511 return ret;
1512 }
1513
1514 req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
1515 if ((ret = req_submit(bcs, req, 0, BAS_TIMEOUT)) < 0) {
1516 err("could not open channel %d: %s",
1517 bcs->channel + 1, get_usb_statmsg(ret));
1518 stopurbs(bcs->hw.bas);
1519 error_hangup(bcs);
1520 }
1521 return ret;
1522 }
1523
1524 /* gigaset_close_bchannel
1525 * called by common.c to disconnect a B channel
1526 * tell the Gigaset base to close the channel
1527 * stopping isochronous I/O and LL notification will be done when the
1528 * acknowledgement for the close arrives
1529 * argument:
1530 * B channel control structure
1531 * return value:
1532 * 0 on success, error code < 0 on error
1533 */
1534 static int gigaset_close_bchannel(struct bc_state *bcs)
1535 {
1536 int req, ret;
1537
1538 IFNULLRETVAL(bcs, -EINVAL);
1539
1540 if (!(atomic_read(&bcs->cs->hw.bas->basstate) &
1541 (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
1542 /* channel not running: just signal common.c */
1543 gigaset_bchannel_down(bcs);
1544 return 0;
1545 }
1546
1547 req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
1548 if ((ret = req_submit(bcs, req, 0, BAS_TIMEOUT)) < 0)
1549 err("could not submit HD_CLOSE_BxCHANNEL request: %s",
1550 get_usb_statmsg(ret));
1551 return ret;
1552 }
1553
1554 /* Device Operations */
1555 /* ================= */
1556
1557 /* complete_cb
1558 * unqueue first command buffer from queue, waking any sleepers
1559 * must be called with cs->cmdlock held
1560 * parameter:
1561 * cs controller state structure
1562 */
1563 static void complete_cb(struct cardstate *cs)
1564 {
1565 struct cmdbuf_t *cb;
1566
1567 IFNULLRET(cs);
1568 cb = cs->cmdbuf;
1569 IFNULLRET(cb);
1570
1571 /* unqueue completed buffer */
1572 cs->cmdbytes -= cs->curlen;
1573 dbg(DEBUG_TRANSCMD | DEBUG_LOCKCMD,
1574 "write_command: sent %u bytes, %u left",
1575 cs->curlen, cs->cmdbytes);
1576 if ((cs->cmdbuf = cb->next) != NULL) {
1577 cs->cmdbuf->prev = NULL;
1578 cs->curlen = cs->cmdbuf->len;
1579 } else {
1580 cs->lastcmdbuf = NULL;
1581 cs->curlen = 0;
1582 }
1583
1584 if (cb->wake_tasklet)
1585 tasklet_schedule(cb->wake_tasklet);
1586
1587 kfree(cb);
1588 }
1589
1590 static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len);
1591
1592 /* write_command_callback
1593 * USB completion handler for AT command transmission
1594 * called by the USB subsystem in interrupt context
1595 * parameter:
1596 * urb USB request block of completed request
1597 * urb->context = controller state structure
1598 */
1599 static void write_command_callback(struct urb *urb, struct pt_regs *regs)
1600 {
1601 struct cardstate *cs;
1602 unsigned long flags;
1603 struct bas_cardstate *ucs;
1604
1605 IFNULLRET(urb);
1606 cs = (struct cardstate *) urb->context;
1607 IFNULLRET(cs);
1608 ucs = cs->hw.bas;
1609 IFNULLRET(ucs);
1610
1611 /* check status */
1612 switch (urb->status) {
1613 case 0: /* normal completion */
1614 break;
1615 case -ENOENT: /* canceled */
1616 case -ECONNRESET: /* canceled (async) */
1617 case -EINPROGRESS: /* pending */
1618 /* ignore silently */
1619 dbg(DEBUG_USBREQ,
1620 "%s: %s", __func__, get_usb_statmsg(urb->status));
1621 return;
1622 default: /* any failure */
1623 if (++ucs->retry_cmd_out > BAS_RETRY) {
1624 warn("command write: %s, giving up after %d retries",
1625 get_usb_statmsg(urb->status), ucs->retry_cmd_out);
1626 break;
1627 }
1628 if (cs->cmdbuf == NULL) {
1629 warn("command write: %s, cannot retry - cmdbuf gone",
1630 get_usb_statmsg(urb->status));
1631 break;
1632 }
1633 notice("command write: %s, retry %d",
1634 get_usb_statmsg(urb->status), ucs->retry_cmd_out);
1635 if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
1636 /* resubmitted - bypass regular exit block */
1637 return;
1638 /* command send failed, assume base still waiting */
1639 update_basstate(ucs, BS_ATREADY, 0);
1640 }
1641
1642 spin_lock_irqsave(&cs->cmdlock, flags);
1643 if (cs->cmdbuf != NULL)
1644 complete_cb(cs);
1645 spin_unlock_irqrestore(&cs->cmdlock, flags);
1646 }
1647
1648 /* atrdy_timeout
1649 * timeout routine for AT command transmission
1650 * argument:
1651 * controller state structure
1652 */
1653 static void atrdy_timeout(unsigned long data)
1654 {
1655 struct cardstate *cs = (struct cardstate *) data;
1656 struct bas_cardstate *ucs;
1657
1658 IFNULLRET(cs);
1659 ucs = cs->hw.bas;
1660 IFNULLRET(ucs);
1661
1662 warn("timeout waiting for HD_READY_SEND_ATDATA");
1663
1664 /* fake the missing signal - what else can I do? */
1665 update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
1666 start_cbsend(cs);
1667 }
1668
1669 /* atwrite_submit
1670 * submit an HD_WRITE_ATMESSAGE command URB
1671 * parameters:
1672 * cs controller state structure
1673 * buf buffer containing command to send
1674 * len length of command to send
1675 * return value:
1676 * 0 on success
1677 * -EFAULT if a NULL pointer is encountered somewhere
1678 * -EBUSY if another request is pending
1679 * any URB submission error code
1680 */
1681 static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
1682 {
1683 struct bas_cardstate *ucs;
1684 int ret;
1685
1686 IFNULLRETVAL(cs, -EFAULT);
1687 ucs = cs->hw.bas;
1688 IFNULLRETVAL(ucs, -EFAULT);
1689 IFNULLRETVAL(ucs->urb_cmd_out, -EFAULT);
1690
1691 dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
1692
1693 if (ucs->urb_cmd_out->status == -EINPROGRESS) {
1694 err("could not submit HD_WRITE_ATMESSAGE: URB busy");
1695 return -EBUSY;
1696 }
1697
1698 ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
1699 ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
1700 ucs->dr_cmd_out.wValue = 0;
1701 ucs->dr_cmd_out.wIndex = 0;
1702 ucs->dr_cmd_out.wLength = cpu_to_le16(len);
1703 usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
1704 usb_sndctrlpipe(ucs->udev, 0),
1705 (unsigned char*) &ucs->dr_cmd_out, buf, len,
1706 write_command_callback, cs);
1707
1708 if ((ret = usb_submit_urb(ucs->urb_cmd_out, SLAB_ATOMIC)) != 0) {
1709 err("could not submit HD_WRITE_ATMESSAGE: %s",
1710 get_usb_statmsg(ret));
1711 return ret;
1712 }
1713
1714 /* submitted successfully */
1715 update_basstate(ucs, 0, BS_ATREADY);
1716
1717 /* start timeout if necessary */
1718 if (!(atomic_read(&ucs->basstate) & BS_ATTIMER)) {
1719 dbg(DEBUG_OUTPUT,
1720 "setting ATREADY timeout of %d/10 secs", ATRDY_TIMEOUT);
1721 ucs->timer_atrdy.expires = jiffies + ATRDY_TIMEOUT * HZ / 10;
1722 ucs->timer_atrdy.data = (unsigned long) cs;
1723 ucs->timer_atrdy.function = atrdy_timeout;
1724 add_timer(&ucs->timer_atrdy);
1725 update_basstate(ucs, BS_ATTIMER, 0);
1726 }
1727 return 0;
1728 }
1729
1730 /* start_cbsend
1731 * start transmission of AT command queue if necessary
1732 * parameter:
1733 * cs controller state structure
1734 * return value:
1735 * 0 on success
1736 * error code < 0 on error
1737 */
1738 static int start_cbsend(struct cardstate *cs)
1739 {
1740 struct cmdbuf_t *cb;
1741 struct bas_cardstate *ucs;
1742 unsigned long flags;
1743 int rc;
1744 int retval = 0;
1745
1746 IFNULLRETVAL(cs, -EFAULT);
1747 ucs = cs->hw.bas;
1748 IFNULLRETVAL(ucs, -EFAULT);
1749
1750 /* check if AT channel is open */
1751 if (!(atomic_read(&ucs->basstate) & BS_ATOPEN)) {
1752 dbg(DEBUG_TRANSCMD | DEBUG_LOCKCMD, "AT channel not open");
1753 rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
1754 if (rc < 0) {
1755 err("could not open AT channel");
1756 /* flush command queue */
1757 spin_lock_irqsave(&cs->cmdlock, flags);
1758 while (cs->cmdbuf != NULL)
1759 complete_cb(cs);
1760 spin_unlock_irqrestore(&cs->cmdlock, flags);
1761 }
1762 return rc;
1763 }
1764
1765 /* try to send first command in queue */
1766 spin_lock_irqsave(&cs->cmdlock, flags);
1767
1768 while ((cb = cs->cmdbuf) != NULL &&
1769 atomic_read(&ucs->basstate) & BS_ATREADY) {
1770 ucs->retry_cmd_out = 0;
1771 rc = atwrite_submit(cs, cb->buf, cb->len);
1772 if (unlikely(rc)) {
1773 retval = rc;
1774 complete_cb(cs);
1775 }
1776 }
1777
1778 spin_unlock_irqrestore(&cs->cmdlock, flags);
1779 return retval;
1780 }
1781
1782 /* gigaset_write_cmd
1783 * This function is called by the device independent part of the driver
1784 * to transmit an AT command string to the Gigaset device.
1785 * It encapsulates the device specific method for transmission over the
1786 * direct USB connection to the base.
1787 * The command string is added to the queue of commands to send, and
1788 * USB transmission is started if necessary.
1789 * parameters:
1790 * cs controller state structure
1791 * buf command string to send
1792 * len number of bytes to send (max. IF_WRITEBUF)
1793 * wake_tasklet tasklet to run when transmission is completed
1794 * (NULL if none)
1795 * return value:
1796 * number of bytes queued on success
1797 * error code < 0 on error
1798 */
1799 static int gigaset_write_cmd(struct cardstate *cs,
1800 const unsigned char *buf, int len,
1801 struct tasklet_struct *wake_tasklet)
1802 {
1803 struct cmdbuf_t *cb;
1804 unsigned long flags;
1805 int status;
1806
1807 gigaset_dbg_buffer(atomic_read(&cs->mstate) != MS_LOCKED ?
1808 DEBUG_TRANSCMD : DEBUG_LOCKCMD,
1809 "CMD Transmit", len, buf, 0);
1810
1811 if (!atomic_read(&cs->connected)) {
1812 err("%s: not connected", __func__);
1813 return -ENODEV;
1814 }
1815
1816 if (len <= 0)
1817 return 0; /* nothing to do */
1818
1819 if (len > IF_WRITEBUF)
1820 len = IF_WRITEBUF;
1821 if (!(cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC))) {
1822 err("%s: out of memory", __func__);
1823 return -ENOMEM;
1824 }
1825
1826 memcpy(cb->buf, buf, len);
1827 cb->len = len;
1828 cb->offset = 0;
1829 cb->next = NULL;
1830 cb->wake_tasklet = wake_tasklet;
1831
1832 spin_lock_irqsave(&cs->cmdlock, flags);
1833 cb->prev = cs->lastcmdbuf;
1834 if (cs->lastcmdbuf)
1835 cs->lastcmdbuf->next = cb;
1836 else {
1837 cs->cmdbuf = cb;
1838 cs->curlen = len;
1839 }
1840 cs->cmdbytes += len;
1841 cs->lastcmdbuf = cb;
1842 spin_unlock_irqrestore(&cs->cmdlock, flags);
1843
1844 status = start_cbsend(cs);
1845
1846 return status < 0 ? status : len;
1847 }
1848
1849 /* gigaset_write_room
1850 * tty_driver.write_room interface routine
1851 * return number of characters the driver will accept to be written via
1852 * gigaset_write_cmd
1853 * parameter:
1854 * controller state structure
1855 * return value:
1856 * number of characters
1857 */
1858 static int gigaset_write_room(struct cardstate *cs)
1859 {
1860 return IF_WRITEBUF;
1861 }
1862
1863 /* gigaset_chars_in_buffer
1864 * tty_driver.chars_in_buffer interface routine
1865 * return number of characters waiting to be sent
1866 * parameter:
1867 * controller state structure
1868 * return value:
1869 * number of characters
1870 */
1871 static int gigaset_chars_in_buffer(struct cardstate *cs)
1872 {
1873 unsigned long flags;
1874 unsigned bytes;
1875
1876 spin_lock_irqsave(&cs->cmdlock, flags);
1877 bytes = cs->cmdbytes;
1878 spin_unlock_irqrestore(&cs->cmdlock, flags);
1879
1880 return bytes;
1881 }
1882
1883 /* gigaset_brkchars
1884 * implementation of ioctl(GIGASET_BRKCHARS)
1885 * parameter:
1886 * controller state structure
1887 * return value:
1888 * -EINVAL (unimplemented function)
1889 */
1890 static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
1891 {
1892 return -EINVAL;
1893 }
1894
1895
1896 /* Device Initialization/Shutdown */
1897 /* ============================== */
1898
1899 /* Free hardware dependent part of the B channel structure
1900 * parameter:
1901 * bcs B channel structure
1902 * return value:
1903 * !=0 on success
1904 */
1905 static int gigaset_freebcshw(struct bc_state *bcs)
1906 {
1907 if (!bcs->hw.bas)
1908 return 0;
1909
1910 if (bcs->hw.bas->isooutbuf)
1911 kfree(bcs->hw.bas->isooutbuf);
1912 kfree(bcs->hw.bas);
1913 bcs->hw.bas = NULL;
1914 return 1;
1915 }
1916
1917 /* Initialize hardware dependent part of the B channel structure
1918 * parameter:
1919 * bcs B channel structure
1920 * return value:
1921 * !=0 on success
1922 */
1923 static int gigaset_initbcshw(struct bc_state *bcs)
1924 {
1925 int i;
1926 struct bas_bc_state *ubc;
1927
1928 bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
1929 if (!ubc) {
1930 err("could not allocate bas_bc_state");
1931 return 0;
1932 }
1933
1934 atomic_set(&ubc->running, 0);
1935 atomic_set(&ubc->corrbytes, 0);
1936 spin_lock_init(&ubc->isooutlock);
1937 for (i = 0; i < BAS_OUTURBS; ++i) {
1938 ubc->isoouturbs[i].urb = NULL;
1939 ubc->isoouturbs[i].bcs = bcs;
1940 }
1941 ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
1942 ubc->numsub = 0;
1943 if (!(ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL))) {
1944 err("could not allocate isochronous output buffer");
1945 kfree(ubc);
1946 bcs->hw.bas = NULL;
1947 return 0;
1948 }
1949 tasklet_init(&ubc->sent_tasklet,
1950 &write_iso_tasklet, (unsigned long) bcs);
1951
1952 spin_lock_init(&ubc->isoinlock);
1953 for (i = 0; i < BAS_INURBS; ++i)
1954 ubc->isoinurbs[i] = NULL;
1955 ubc->isoindone = NULL;
1956 ubc->loststatus = -EINPROGRESS;
1957 ubc->isoinlost = 0;
1958 ubc->seqlen = 0;
1959 ubc->inbyte = 0;
1960 ubc->inbits = 0;
1961 ubc->goodbytes = 0;
1962 ubc->alignerrs = 0;
1963 ubc->fcserrs = 0;
1964 ubc->frameerrs = 0;
1965 ubc->giants = 0;
1966 ubc->runts = 0;
1967 ubc->aborts = 0;
1968 ubc->shared0s = 0;
1969 ubc->stolen0s = 0;
1970 tasklet_init(&ubc->rcvd_tasklet,
1971 &read_iso_tasklet, (unsigned long) bcs);
1972 return 1;
1973 }
1974
1975 static void gigaset_reinitbcshw(struct bc_state *bcs)
1976 {
1977 struct bas_bc_state *ubc = bcs->hw.bas;
1978
1979 atomic_set(&bcs->hw.bas->running, 0);
1980 atomic_set(&bcs->hw.bas->corrbytes, 0);
1981 bcs->hw.bas->numsub = 0;
1982 spin_lock_init(&ubc->isooutlock);
1983 spin_lock_init(&ubc->isoinlock);
1984 ubc->loststatus = -EINPROGRESS;
1985 }
1986
1987 static void gigaset_freecshw(struct cardstate *cs)
1988 {
1989 struct bas_cardstate *ucs = cs->hw.bas;
1990
1991 del_timer(&ucs->timer_ctrl);
1992 del_timer(&ucs->timer_atrdy);
1993 del_timer(&ucs->timer_cmd_in);
1994
1995 kfree(cs->hw.bas);
1996 }
1997
1998 static int gigaset_initcshw(struct cardstate *cs)
1999 {
2000 struct bas_cardstate *ucs;
2001
2002 cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
2003 if (!ucs)
2004 return 0;
2005
2006 ucs->urb_cmd_in = NULL;
2007 ucs->urb_cmd_out = NULL;
2008 ucs->rcvbuf = NULL;
2009 ucs->rcvbuf_size = 0;
2010
2011 spin_lock_init(&ucs->lock);
2012 ucs->pending = 0;
2013
2014 atomic_set(&ucs->basstate, 0);
2015 init_timer(&ucs->timer_ctrl);
2016 init_timer(&ucs->timer_atrdy);
2017 init_timer(&ucs->timer_cmd_in);
2018
2019 return 1;
2020 }
2021
2022 /* freeurbs
2023 * unlink and deallocate all URBs unconditionally
2024 * caller must make sure that no commands are still in progress
2025 * parameter:
2026 * cs controller state structure
2027 */
2028 static void freeurbs(struct cardstate *cs)
2029 {
2030 struct bas_cardstate *ucs;
2031 struct bas_bc_state *ubc;
2032 int i, j;
2033
2034 IFNULLRET(cs);
2035 ucs = cs->hw.bas;
2036 IFNULLRET(ucs);
2037
2038 for (j = 0; j < 2; ++j) {
2039 ubc = cs->bcs[j].hw.bas;
2040 IFNULLCONT(ubc);
2041 for (i = 0; i < BAS_OUTURBS; ++i)
2042 if (ubc->isoouturbs[i].urb) {
2043 usb_kill_urb(ubc->isoouturbs[i].urb);
2044 dbg(DEBUG_INIT,
2045 "%s: isoc output URB %d/%d unlinked",
2046 __func__, j, i);
2047 usb_free_urb(ubc->isoouturbs[i].urb);
2048 ubc->isoouturbs[i].urb = NULL;
2049 }
2050 for (i = 0; i < BAS_INURBS; ++i)
2051 if (ubc->isoinurbs[i]) {
2052 usb_kill_urb(ubc->isoinurbs[i]);
2053 dbg(DEBUG_INIT,
2054 "%s: isoc input URB %d/%d unlinked",
2055 __func__, j, i);
2056 usb_free_urb(ubc->isoinurbs[i]);
2057 ubc->isoinurbs[i] = NULL;
2058 }
2059 }
2060 if (ucs->urb_int_in) {
2061 usb_kill_urb(ucs->urb_int_in);
2062 dbg(DEBUG_INIT, "%s: interrupt input URB unlinked", __func__);
2063 usb_free_urb(ucs->urb_int_in);
2064 ucs->urb_int_in = NULL;
2065 }
2066 if (ucs->urb_cmd_out) {
2067 usb_kill_urb(ucs->urb_cmd_out);
2068 dbg(DEBUG_INIT, "%s: command output URB unlinked", __func__);
2069 usb_free_urb(ucs->urb_cmd_out);
2070 ucs->urb_cmd_out = NULL;
2071 }
2072 if (ucs->urb_cmd_in) {
2073 usb_kill_urb(ucs->urb_cmd_in);
2074 dbg(DEBUG_INIT, "%s: command input URB unlinked", __func__);
2075 usb_free_urb(ucs->urb_cmd_in);
2076 ucs->urb_cmd_in = NULL;
2077 }
2078 if (ucs->urb_ctrl) {
2079 usb_kill_urb(ucs->urb_ctrl);
2080 dbg(DEBUG_INIT, "%s: control output URB unlinked", __func__);
2081 usb_free_urb(ucs->urb_ctrl);
2082 ucs->urb_ctrl = NULL;
2083 }
2084 }
2085
2086 /* gigaset_probe
2087 * This function is called when a new USB device is connected.
2088 * It checks whether the new device is handled by this driver.
2089 */
2090 static int gigaset_probe(struct usb_interface *interface,
2091 const struct usb_device_id *id)
2092 {
2093 struct usb_host_interface *hostif;
2094 struct usb_device *udev = interface_to_usbdev(interface);
2095 struct cardstate *cs = NULL;
2096 struct bas_cardstate *ucs = NULL;
2097 struct bas_bc_state *ubc;
2098 struct usb_endpoint_descriptor *endpoint;
2099 int i, j;
2100 int ret;
2101
2102 IFNULLRETVAL(udev, -ENODEV);
2103
2104 dbg(DEBUG_ANY,
2105 "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
2106 __func__, le16_to_cpu(udev->descriptor.idVendor),
2107 le16_to_cpu(udev->descriptor.idProduct));
2108
2109 /* See if the device offered us matches what we can accept */
2110 if ((le16_to_cpu(udev->descriptor.idVendor) != USB_GIGA_VENDOR_ID) ||
2111 (le16_to_cpu(udev->descriptor.idProduct) != USB_GIGA_PRODUCT_ID &&
2112 le16_to_cpu(udev->descriptor.idProduct) != USB_4175_PRODUCT_ID &&
2113 le16_to_cpu(udev->descriptor.idProduct) != USB_SX303_PRODUCT_ID &&
2114 le16_to_cpu(udev->descriptor.idProduct) != USB_SX353_PRODUCT_ID)) {
2115 dbg(DEBUG_ANY, "%s: unmatched ID - exiting", __func__);
2116 return -ENODEV;
2117 }
2118
2119 /* set required alternate setting */
2120 hostif = interface->cur_altsetting;
2121 if (hostif->desc.bAlternateSetting != 3) {
2122 dbg(DEBUG_ANY,
2123 "%s: wrong alternate setting %d - trying to switch",
2124 __func__, hostif->desc.bAlternateSetting);
2125 if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3) < 0) {
2126 warn("usb_set_interface failed, device %d interface %d altsetting %d",
2127 udev->devnum, hostif->desc.bInterfaceNumber,
2128 hostif->desc.bAlternateSetting);
2129 return -ENODEV;
2130 }
2131 hostif = interface->cur_altsetting;
2132 }
2133
2134 /* Reject application specific interfaces
2135 */
2136 if (hostif->desc.bInterfaceClass != 255) {
2137 warn("%s: bInterfaceClass == %d",
2138 __func__, hostif->desc.bInterfaceClass);
2139 return -ENODEV;
2140 }
2141
2142 info("%s: Device matched (Vendor: 0x%x, Product: 0x%x)",
2143 __func__, le16_to_cpu(udev->descriptor.idVendor),
2144 le16_to_cpu(udev->descriptor.idProduct));
2145
2146 cs = gigaset_getunassignedcs(driver);
2147 if (!cs) {
2148 err("%s: no free cardstate", __func__);
2149 return -ENODEV;
2150 }
2151 ucs = cs->hw.bas;
2152 ucs->udev = udev;
2153 ucs->interface = interface;
2154
2155 /* allocate URBs:
2156 * - one for the interrupt pipe
2157 * - three for the different uses of the default control pipe
2158 * - three for each isochronous pipe
2159 */
2160 ucs->urb_int_in = usb_alloc_urb(0, SLAB_KERNEL);
2161 if (!ucs->urb_int_in) {
2162 err("No free urbs available");
2163 goto error;
2164 }
2165 ucs->urb_cmd_in = usb_alloc_urb(0, SLAB_KERNEL);
2166 if (!ucs->urb_cmd_in) {
2167 err("No free urbs available");
2168 goto error;
2169 }
2170 ucs->urb_cmd_out = usb_alloc_urb(0, SLAB_KERNEL);
2171 if (!ucs->urb_cmd_out) {
2172 err("No free urbs available");
2173 goto error;
2174 }
2175 ucs->urb_ctrl = usb_alloc_urb(0, SLAB_KERNEL);
2176 if (!ucs->urb_ctrl) {
2177 err("No free urbs available");
2178 goto error;
2179 }
2180
2181 for (j = 0; j < 2; ++j) {
2182 ubc = cs->bcs[j].hw.bas;
2183 for (i = 0; i < BAS_OUTURBS; ++i) {
2184 ubc->isoouturbs[i].urb =
2185 usb_alloc_urb(BAS_NUMFRAMES, SLAB_KERNEL);
2186 if (!ubc->isoouturbs[i].urb) {
2187 err("No free urbs available");
2188 goto error;
2189 }
2190 }
2191 for (i = 0; i < BAS_INURBS; ++i) {
2192 ubc->isoinurbs[i] =
2193 usb_alloc_urb(BAS_NUMFRAMES, SLAB_KERNEL);
2194 if (!ubc->isoinurbs[i]) {
2195 err("No free urbs available");
2196 goto error;
2197 }
2198 }
2199 }
2200
2201 ucs->rcvbuf = NULL;
2202 ucs->rcvbuf_size = 0;
2203
2204 /* Fill the interrupt urb and send it to the core */
2205 endpoint = &hostif->endpoint[0].desc;
2206 usb_fill_int_urb(ucs->urb_int_in, udev,
2207 usb_rcvintpipe(udev,
2208 (endpoint->bEndpointAddress) & 0x0f),
2209 ucs->int_in_buf, 3, read_int_callback, cs,
2210 endpoint->bInterval);
2211 ret = usb_submit_urb(ucs->urb_int_in, SLAB_KERNEL);
2212 if (ret) {
2213 err("could not submit interrupt URB: %s", get_usb_statmsg(ret));
2214 goto error;
2215 }
2216
2217 /* tell the device that the driver is ready */
2218 if ((ret = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0)) != 0)
2219 goto error;
2220
2221 /* tell common part that the device is ready */
2222 if (startmode == SM_LOCKED)
2223 atomic_set(&cs->mstate, MS_LOCKED);
2224 if (!gigaset_start(cs))
2225 goto error;
2226
2227 /* save address of controller structure */
2228 usb_set_intfdata(interface, cs);
2229
2230 /* set up device sysfs */
2231 gigaset_init_dev_sysfs(interface);
2232 return 0;
2233
2234 error:
2235 freeurbs(cs);
2236 gigaset_unassign(cs);
2237 return -ENODEV;
2238 }
2239
2240 /* gigaset_disconnect
2241 * This function is called when the Gigaset base is unplugged.
2242 */
2243 static void gigaset_disconnect(struct usb_interface *interface)
2244 {
2245 struct cardstate *cs;
2246 struct bas_cardstate *ucs;
2247
2248 /* clear device sysfs */
2249 gigaset_free_dev_sysfs(interface);
2250
2251 cs = usb_get_intfdata(interface);
2252 usb_set_intfdata(interface, NULL);
2253
2254 IFNULLRET(cs);
2255 ucs = cs->hw.bas;
2256 IFNULLRET(ucs);
2257
2258 info("disconnecting GigaSet base");
2259 gigaset_stop(cs);
2260 freeurbs(cs);
2261 kfree(ucs->rcvbuf);
2262 ucs->rcvbuf = NULL;
2263 ucs->rcvbuf_size = 0;
2264 atomic_set(&ucs->basstate, 0);
2265 gigaset_unassign(cs);
2266 }
2267
2268 static struct gigaset_ops gigops = {
2269 gigaset_write_cmd,
2270 gigaset_write_room,
2271 gigaset_chars_in_buffer,
2272 gigaset_brkchars,
2273 gigaset_init_bchannel,
2274 gigaset_close_bchannel,
2275 gigaset_initbcshw,
2276 gigaset_freebcshw,
2277 gigaset_reinitbcshw,
2278 gigaset_initcshw,
2279 gigaset_freecshw,
2280 gigaset_set_modem_ctrl,
2281 gigaset_baud_rate,
2282 gigaset_set_line_ctrl,
2283 gigaset_isoc_send_skb,
2284 gigaset_isoc_input,
2285 };
2286
2287 /* bas_gigaset_init
2288 * This function is called after the kernel module is loaded.
2289 */
2290 static int __init bas_gigaset_init(void)
2291 {
2292 int result;
2293
2294 /* allocate memory for our driver state and intialize it */
2295 if ((driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
2296 GIGASET_MODULENAME, GIGASET_DEVNAME,
2297 GIGASET_DEVFSNAME, &gigops,
2298 THIS_MODULE)) == NULL)
2299 goto error;
2300
2301 /* allocate memory for our device state and intialize it */
2302 cardstate = gigaset_initcs(driver, 2, 0, 0, cidmode,
2303 GIGASET_MODULENAME);
2304 if (!cardstate)
2305 goto error;
2306
2307 /* register this driver with the USB subsystem */
2308 result = usb_register(&gigaset_usb_driver);
2309 if (result < 0) {
2310 err("usb_register failed (error %d)", -result);
2311 goto error;
2312 }
2313
2314 info(DRIVER_AUTHOR);
2315 info(DRIVER_DESC);
2316 return 0;
2317
2318 error: if (cardstate)
2319 gigaset_freecs(cardstate);
2320 cardstate = NULL;
2321 if (driver)
2322 gigaset_freedriver(driver);
2323 driver = NULL;
2324 return -1;
2325 }
2326
2327 /* bas_gigaset_exit
2328 * This function is called before the kernel module is unloaded.
2329 */
2330 static void __exit bas_gigaset_exit(void)
2331 {
2332 gigaset_blockdriver(driver); /* => probe will fail
2333 * => no gigaset_start any more
2334 */
2335
2336 gigaset_shutdown(cardstate);
2337 /* from now on, no isdn callback should be possible */
2338
2339 if (atomic_read(&cardstate->hw.bas->basstate) & BS_ATOPEN) {
2340 dbg(DEBUG_ANY, "closing AT channel");
2341 if (req_submit(cardstate->bcs,
2342 HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT) >= 0) {
2343 /* successfully submitted - wait for completion */
2344 //wait_event_interruptible(cs->initwait, !cs->hw.bas->pending);
2345 //FIXME need own wait queue? wakeup?
2346 }
2347 }
2348
2349 /* deregister this driver with the USB subsystem */
2350 usb_deregister(&gigaset_usb_driver);
2351 /* this will call the disconnect-callback */
2352 /* from now on, no disconnect/probe callback should be running */
2353
2354 gigaset_freecs(cardstate);
2355 cardstate = NULL;
2356 gigaset_freedriver(driver);
2357 driver = NULL;
2358 }
2359
2360
2361 module_init(bas_gigaset_init);
2362 module_exit(bas_gigaset_exit);
2363
2364 MODULE_AUTHOR(DRIVER_AUTHOR);
2365 MODULE_DESCRIPTION(DRIVER_DESC);
2366 MODULE_LICENSE("GPL");
Support for the Chinese Samsung S3C2440 based development boards