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Viewing changes to drivers/isdn/gigaset/bas-gigaset.c

  • Committer: Bazaar Package Importer
  • Author(s): Amit Kucheria, Amit Kucheria
  • Date: 2010-03-10 02:28:15 UTC
  • Revision ID: james.westby@ubuntu.com-20100310022815-7sd3gwvn5kenaq33
Tags: 2.6.33-500.1
[ Amit Kucheria ]

* Initial release of a 2.6.33-based OMAP kernel
* UBUNTU: [Upstream] Fix omap 1-wire driver compilation
* UBUNTU: ubuntu: AppArmor -- update to mainline 2010-03-04

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drivers/isdn/gigaset/bas-gigaset.c
 
1
/*
 
2
 * USB driver for Gigaset 307x base via direct USB connection.
 
3
 *
 
4
 * Copyright (c) 2001 by Hansjoerg Lipp <hjlipp@web.de>,
 
5
 *                       Tilman Schmidt <tilman@imap.cc>,
 
6
 *                       Stefan Eilers.
 
7
 *
 
8
 * =====================================================================
 
9
 *      This program is free software; you can redistribute it and/or
 
10
 *      modify it under the terms of the GNU General Public License as
 
11
 *      published by the Free Software Foundation; either version 2 of
 
12
 *      the License, or (at your option) any later version.
 
13
 * =====================================================================
 
14
 */
 
15
 
 
16
#include "gigaset.h"
 
17
 
 
18
#include <linux/errno.h>
 
19
#include <linux/init.h>
 
20
#include <linux/slab.h>
 
21
#include <linux/timer.h>
 
22
#include <linux/usb.h>
 
23
#include <linux/module.h>
 
24
#include <linux/moduleparam.h>
 
25
 
 
26
/* Version Information */
 
27
#define DRIVER_AUTHOR "Tilman Schmidt <tilman@imap.cc>, Hansjoerg Lipp <hjlipp@web.de>, Stefan Eilers"
 
28
#define DRIVER_DESC "USB Driver for Gigaset 307x"
 
29
 
 
30
 
 
31
/* Module parameters */
 
32
 
 
33
static int startmode = SM_ISDN;
 
34
static int cidmode = 1;
 
35
 
 
36
module_param(startmode, int, S_IRUGO);
 
37
module_param(cidmode, int, S_IRUGO);
 
38
MODULE_PARM_DESC(startmode, "start in isdn4linux mode");
 
39
MODULE_PARM_DESC(cidmode, "Call-ID mode");
 
40
 
 
41
#define GIGASET_MINORS     1
 
42
#define GIGASET_MINOR      16
 
43
#define GIGASET_MODULENAME "bas_gigaset"
 
44
#define GIGASET_DEVNAME    "ttyGB"
 
45
 
 
46
/* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */
 
47
#define IF_WRITEBUF 264
 
48
 
 
49
/* interrupt pipe message size according to ibid. ch. 2.2 */
 
50
#define IP_MSGSIZE 3
 
51
 
 
52
/* Values for the Gigaset 307x */
 
53
#define USB_GIGA_VENDOR_ID      0x0681
 
54
#define USB_3070_PRODUCT_ID     0x0001
 
55
#define USB_3075_PRODUCT_ID     0x0002
 
56
#define USB_SX303_PRODUCT_ID    0x0021
 
57
#define USB_SX353_PRODUCT_ID    0x0022
 
58
 
 
59
/* table of devices that work with this driver */
 
60
static const struct usb_device_id gigaset_table[] = {
 
61
        { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3070_PRODUCT_ID) },
 
62
        { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_3075_PRODUCT_ID) },
 
63
        { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX303_PRODUCT_ID) },
 
64
        { USB_DEVICE(USB_GIGA_VENDOR_ID, USB_SX353_PRODUCT_ID) },
 
65
        { } /* Terminating entry */
 
66
};
 
67
 
 
68
MODULE_DEVICE_TABLE(usb, gigaset_table);
 
69
 
 
70
/*======================= local function prototypes ==========================*/
 
71
 
 
72
/* function called if a new device belonging to this driver is connected */
 
73
static int gigaset_probe(struct usb_interface *interface,
 
74
                         const struct usb_device_id *id);
 
75
 
 
76
/* Function will be called if the device is unplugged */
 
77
static void gigaset_disconnect(struct usb_interface *interface);
 
78
 
 
79
/* functions called before/after suspend */
 
80
static int gigaset_suspend(struct usb_interface *intf, pm_message_t message);
 
81
static int gigaset_resume(struct usb_interface *intf);
 
82
 
 
83
/* functions called before/after device reset */
 
84
static int gigaset_pre_reset(struct usb_interface *intf);
 
85
static int gigaset_post_reset(struct usb_interface *intf);
 
86
 
 
87
static int atread_submit(struct cardstate *, int);
 
88
static void stopurbs(struct bas_bc_state *);
 
89
static int req_submit(struct bc_state *, int, int, int);
 
90
static int atwrite_submit(struct cardstate *, unsigned char *, int);
 
91
static int start_cbsend(struct cardstate *);
 
92
 
 
93
/*============================================================================*/
 
94
 
 
95
struct bas_cardstate {
 
96
        struct usb_device       *udev;          /* USB device pointer */
 
97
        struct usb_interface    *interface;     /* interface for this device */
 
98
        unsigned char           minor;          /* starting minor number */
 
99
 
 
100
        struct urb              *urb_ctrl;      /* control pipe default URB */
 
101
        struct usb_ctrlrequest  dr_ctrl;
 
102
        struct timer_list       timer_ctrl;     /* control request timeout */
 
103
        int                     retry_ctrl;
 
104
 
 
105
        struct timer_list       timer_atrdy;    /* AT command ready timeout */
 
106
        struct urb              *urb_cmd_out;   /* for sending AT commands */
 
107
        struct usb_ctrlrequest  dr_cmd_out;
 
108
        int                     retry_cmd_out;
 
109
 
 
110
        struct urb              *urb_cmd_in;    /* for receiving AT replies */
 
111
        struct usb_ctrlrequest  dr_cmd_in;
 
112
        struct timer_list       timer_cmd_in;   /* receive request timeout */
 
113
        unsigned char           *rcvbuf;        /* AT reply receive buffer */
 
114
 
 
115
        struct urb              *urb_int_in;    /* URB for interrupt pipe */
 
116
        unsigned char           *int_in_buf;
 
117
 
 
118
        spinlock_t              lock;           /* locks all following */
 
119
        int                     basstate;       /* bitmap (BS_*) */
 
120
        int                     pending;        /* uncompleted base request */
 
121
        wait_queue_head_t       waitqueue;
 
122
        int                     rcvbuf_size;    /* size of AT receive buffer */
 
123
                                                /* 0: no receive in progress */
 
124
        int                     retry_cmd_in;   /* receive req retry count */
 
125
};
 
126
 
 
127
/* status of direct USB connection to 307x base (bits in basstate) */
 
128
#define BS_ATOPEN       0x001   /* AT channel open */
 
129
#define BS_B1OPEN       0x002   /* B channel 1 open */
 
130
#define BS_B2OPEN       0x004   /* B channel 2 open */
 
131
#define BS_ATREADY      0x008   /* base ready for AT command */
 
132
#define BS_INIT         0x010   /* base has signalled INIT_OK */
 
133
#define BS_ATTIMER      0x020   /* waiting for HD_READY_SEND_ATDATA */
 
134
#define BS_ATRDPEND     0x040   /* urb_cmd_in in use */
 
135
#define BS_ATWRPEND     0x080   /* urb_cmd_out in use */
 
136
#define BS_SUSPEND      0x100   /* USB port suspended */
 
137
#define BS_RESETTING    0x200   /* waiting for HD_RESET_INTERRUPT_PIPE_ACK */
 
138
 
 
139
 
 
140
static struct gigaset_driver *driver;
 
141
 
 
142
/* usb specific object needed to register this driver with the usb subsystem */
 
143
static struct usb_driver gigaset_usb_driver = {
 
144
        .name =         GIGASET_MODULENAME,
 
145
        .probe =        gigaset_probe,
 
146
        .disconnect =   gigaset_disconnect,
 
147
        .id_table =     gigaset_table,
 
148
        .suspend =      gigaset_suspend,
 
149
        .resume =       gigaset_resume,
 
150
        .reset_resume = gigaset_post_reset,
 
151
        .pre_reset =    gigaset_pre_reset,
 
152
        .post_reset =   gigaset_post_reset,
 
153
};
 
154
 
 
155
/* get message text for usb_submit_urb return code
 
156
 */
 
157
static char *get_usb_rcmsg(int rc)
 
158
{
 
159
        static char unkmsg[28];
 
160
 
 
161
        switch (rc) {
 
162
        case 0:
 
163
                return "success";
 
164
        case -ENOMEM:
 
165
                return "out of memory";
 
166
        case -ENODEV:
 
167
                return "device not present";
 
168
        case -ENOENT:
 
169
                return "endpoint not present";
 
170
        case -ENXIO:
 
171
                return "URB type not supported";
 
172
        case -EINVAL:
 
173
                return "invalid argument";
 
174
        case -EAGAIN:
 
175
                return "start frame too early or too much scheduled";
 
176
        case -EFBIG:
 
177
                return "too many isochronous frames requested";
 
178
        case -EPIPE:
 
179
                return "endpoint stalled";
 
180
        case -EMSGSIZE:
 
181
                return "invalid packet size";
 
182
        case -ENOSPC:
 
183
                return "would overcommit USB bandwidth";
 
184
        case -ESHUTDOWN:
 
185
                return "device shut down";
 
186
        case -EPERM:
 
187
                return "reject flag set";
 
188
        case -EHOSTUNREACH:
 
189
                return "device suspended";
 
190
        default:
 
191
                snprintf(unkmsg, sizeof(unkmsg), "unknown error %d", rc);
 
192
                return unkmsg;
 
193
        }
 
194
}
 
195
 
 
196
/* get message text for USB status code
 
197
 */
 
198
static char *get_usb_statmsg(int status)
 
199
{
 
200
        static char unkmsg[28];
 
201
 
 
202
        switch (status) {
 
203
        case 0:
 
204
                return "success";
 
205
        case -ENOENT:
 
206
                return "unlinked (sync)";
 
207
        case -EINPROGRESS:
 
208
                return "pending";
 
209
        case -EPROTO:
 
210
                return "bit stuffing error, timeout, or unknown USB error";
 
211
        case -EILSEQ:
 
212
                return "CRC mismatch, timeout, or unknown USB error";
 
213
        case -ETIME:
 
214
                return "timed out";
 
215
        case -EPIPE:
 
216
                return "endpoint stalled";
 
217
        case -ECOMM:
 
218
                return "IN buffer overrun";
 
219
        case -ENOSR:
 
220
                return "OUT buffer underrun";
 
221
        case -EOVERFLOW:
 
222
                return "too much data";
 
223
        case -EREMOTEIO:
 
224
                return "short packet detected";
 
225
        case -ENODEV:
 
226
                return "device removed";
 
227
        case -EXDEV:
 
228
                return "partial isochronous transfer";
 
229
        case -EINVAL:
 
230
                return "invalid argument";
 
231
        case -ECONNRESET:
 
232
                return "unlinked (async)";
 
233
        case -ESHUTDOWN:
 
234
                return "device shut down";
 
235
        default:
 
236
                snprintf(unkmsg, sizeof(unkmsg), "unknown status %d", status);
 
237
                return unkmsg;
 
238
        }
 
239
}
 
240
 
 
241
/* usb_pipetype_str
 
242
 * retrieve string representation of USB pipe type
 
243
 */
 
244
static inline char *usb_pipetype_str(int pipe)
 
245
{
 
246
        if (usb_pipeisoc(pipe))
 
247
                return "Isoc";
 
248
        if (usb_pipeint(pipe))
 
249
                return "Int";
 
250
        if (usb_pipecontrol(pipe))
 
251
                return "Ctrl";
 
252
        if (usb_pipebulk(pipe))
 
253
                return "Bulk";
 
254
        return "?";
 
255
}
 
256
 
 
257
/* dump_urb
 
258
 * write content of URB to syslog for debugging
 
259
 */
 
260
static inline void dump_urb(enum debuglevel level, const char *tag,
 
261
                            struct urb *urb)
 
262
{
 
263
#ifdef CONFIG_GIGASET_DEBUG
 
264
        int i;
 
265
        gig_dbg(level, "%s urb(0x%08lx)->{", tag, (unsigned long) urb);
 
266
        if (urb) {
 
267
                gig_dbg(level,
 
268
                        "  dev=0x%08lx, pipe=%s:EP%d/DV%d:%s, "
 
269
                        "hcpriv=0x%08lx, transfer_flags=0x%x,",
 
270
                        (unsigned long) urb->dev,
 
271
                        usb_pipetype_str(urb->pipe),
 
272
                        usb_pipeendpoint(urb->pipe), usb_pipedevice(urb->pipe),
 
273
                        usb_pipein(urb->pipe) ? "in" : "out",
 
274
                        (unsigned long) urb->hcpriv,
 
275
                        urb->transfer_flags);
 
276
                gig_dbg(level,
 
277
                        "  transfer_buffer=0x%08lx[%d], actual_length=%d, "
 
278
                        "setup_packet=0x%08lx,",
 
279
                        (unsigned long) urb->transfer_buffer,
 
280
                        urb->transfer_buffer_length, urb->actual_length,
 
281
                        (unsigned long) urb->setup_packet);
 
282
                gig_dbg(level,
 
283
                        "  start_frame=%d, number_of_packets=%d, interval=%d, "
 
284
                        "error_count=%d,",
 
285
                        urb->start_frame, urb->number_of_packets, urb->interval,
 
286
                        urb->error_count);
 
287
                gig_dbg(level,
 
288
                        "  context=0x%08lx, complete=0x%08lx, "
 
289
                        "iso_frame_desc[]={",
 
290
                        (unsigned long) urb->context,
 
291
                        (unsigned long) urb->complete);
 
292
                for (i = 0; i < urb->number_of_packets; i++) {
 
293
                        struct usb_iso_packet_descriptor *pifd
 
294
                                = &urb->iso_frame_desc[i];
 
295
                        gig_dbg(level,
 
296
                                "    {offset=%u, length=%u, actual_length=%u, "
 
297
                                "status=%u}",
 
298
                                pifd->offset, pifd->length, pifd->actual_length,
 
299
                                pifd->status);
 
300
                }
 
301
        }
 
302
        gig_dbg(level, "}}");
 
303
#endif
 
304
}
 
305
 
 
306
/* read/set modem control bits etc. (m10x only) */
 
307
static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state,
 
308
                                  unsigned new_state)
 
309
{
 
310
        return -EINVAL;
 
311
}
 
312
 
 
313
static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag)
 
314
{
 
315
        return -EINVAL;
 
316
}
 
317
 
 
318
static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag)
 
319
{
 
320
        return -EINVAL;
 
321
}
 
322
 
 
323
/* set/clear bits in base connection state, return previous state
 
324
 */
 
325
static inline int update_basstate(struct bas_cardstate *ucs,
 
326
                                  int set, int clear)
 
327
{
 
328
        unsigned long flags;
 
329
        int state;
 
330
 
 
331
        spin_lock_irqsave(&ucs->lock, flags);
 
332
        state = ucs->basstate;
 
333
        ucs->basstate = (state & ~clear) | set;
 
334
        spin_unlock_irqrestore(&ucs->lock, flags);
 
335
        return state;
 
336
}
 
337
 
 
338
/* error_hangup
 
339
 * hang up any existing connection because of an unrecoverable error
 
340
 * This function may be called from any context and takes care of scheduling
 
341
 * the necessary actions for execution outside of interrupt context.
 
342
 * cs->lock must not be held.
 
343
 * argument:
 
344
 *      B channel control structure
 
345
 */
 
346
static inline void error_hangup(struct bc_state *bcs)
 
347
{
 
348
        struct cardstate *cs = bcs->cs;
 
349
 
 
350
        gig_dbg(DEBUG_ANY, "%s: scheduling HUP for channel %d",
 
351
                __func__, bcs->channel);
 
352
 
 
353
        if (!gigaset_add_event(cs, &bcs->at_state, EV_HUP, NULL, 0, NULL))
 
354
                dev_err(cs->dev, "event queue full\n");
 
355
 
 
356
        gigaset_schedule_event(cs);
 
357
}
 
358
 
 
359
/* error_reset
 
360
 * reset Gigaset device because of an unrecoverable error
 
361
 * This function may be called from any context, and takes care of
 
362
 * scheduling the necessary actions for execution outside of interrupt context.
 
363
 * cs->lock must not be held.
 
364
 * argument:
 
365
 *      controller state structure
 
366
 */
 
367
static inline void error_reset(struct cardstate *cs)
 
368
{
 
369
        /* reset interrupt pipe to recover (ignore errors) */
 
370
        update_basstate(cs->hw.bas, BS_RESETTING, 0);
 
371
        req_submit(cs->bcs, HD_RESET_INTERRUPT_PIPE, 0, BAS_TIMEOUT);
 
372
}
 
373
 
 
374
/* check_pending
 
375
 * check for completion of pending control request
 
376
 * parameter:
 
377
 *      ucs     hardware specific controller state structure
 
378
 */
 
379
static void check_pending(struct bas_cardstate *ucs)
 
380
{
 
381
        unsigned long flags;
 
382
 
 
383
        spin_lock_irqsave(&ucs->lock, flags);
 
384
        switch (ucs->pending) {
 
385
        case 0:
 
386
                break;
 
387
        case HD_OPEN_ATCHANNEL:
 
388
                if (ucs->basstate & BS_ATOPEN)
 
389
                        ucs->pending = 0;
 
390
                break;
 
391
        case HD_OPEN_B1CHANNEL:
 
392
                if (ucs->basstate & BS_B1OPEN)
 
393
                        ucs->pending = 0;
 
394
                break;
 
395
        case HD_OPEN_B2CHANNEL:
 
396
                if (ucs->basstate & BS_B2OPEN)
 
397
                        ucs->pending = 0;
 
398
                break;
 
399
        case HD_CLOSE_ATCHANNEL:
 
400
                if (!(ucs->basstate & BS_ATOPEN))
 
401
                        ucs->pending = 0;
 
402
                break;
 
403
        case HD_CLOSE_B1CHANNEL:
 
404
                if (!(ucs->basstate & BS_B1OPEN))
 
405
                        ucs->pending = 0;
 
406
                break;
 
407
        case HD_CLOSE_B2CHANNEL:
 
408
                if (!(ucs->basstate & BS_B2OPEN))
 
409
                        ucs->pending = 0;
 
410
                break;
 
411
        case HD_DEVICE_INIT_ACK:                /* no reply expected */
 
412
                ucs->pending = 0;
 
413
                break;
 
414
        case HD_RESET_INTERRUPT_PIPE:
 
415
                if (!(ucs->basstate & BS_RESETTING))
 
416
                        ucs->pending = 0;
 
417
                break;
 
418
        /*
 
419
         * HD_READ_ATMESSAGE and HD_WRITE_ATMESSAGE are handled separately
 
420
         * and should never end up here
 
421
         */
 
422
        default:
 
423
                dev_warn(&ucs->interface->dev,
 
424
                         "unknown pending request 0x%02x cleared\n",
 
425
                         ucs->pending);
 
426
                ucs->pending = 0;
 
427
        }
 
428
 
 
429
        if (!ucs->pending)
 
430
                del_timer(&ucs->timer_ctrl);
 
431
 
 
432
        spin_unlock_irqrestore(&ucs->lock, flags);
 
433
}
 
434
 
 
435
/* cmd_in_timeout
 
436
 * timeout routine for command input request
 
437
 * argument:
 
438
 *      controller state structure
 
439
 */
 
440
static void cmd_in_timeout(unsigned long data)
 
441
{
 
442
        struct cardstate *cs = (struct cardstate *) data;
 
443
        struct bas_cardstate *ucs = cs->hw.bas;
 
444
        int rc;
 
445
 
 
446
        if (!ucs->rcvbuf_size) {
 
447
                gig_dbg(DEBUG_USBREQ, "%s: no receive in progress", __func__);
 
448
                return;
 
449
        }
 
450
 
 
451
        if (ucs->retry_cmd_in++ < BAS_RETRY) {
 
452
                dev_notice(cs->dev, "control read: timeout, retry %d\n",
 
453
                           ucs->retry_cmd_in);
 
454
                rc = atread_submit(cs, BAS_TIMEOUT);
 
455
                if (rc >= 0 || rc == -ENODEV)
 
456
                        /* resubmitted or disconnected */
 
457
                        /* - bypass regular exit block */
 
458
                        return;
 
459
        } else {
 
460
                dev_err(cs->dev,
 
461
                        "control read: timeout, giving up after %d tries\n",
 
462
                        ucs->retry_cmd_in);
 
463
        }
 
464
        kfree(ucs->rcvbuf);
 
465
        ucs->rcvbuf = NULL;
 
466
        ucs->rcvbuf_size = 0;
 
467
        error_reset(cs);
 
468
}
 
469
 
 
470
/* read_ctrl_callback
 
471
 * USB completion handler for control pipe input
 
472
 * called by the USB subsystem in interrupt context
 
473
 * parameter:
 
474
 *      urb     USB request block
 
475
 *              urb->context = inbuf structure for controller state
 
476
 */
 
477
static void read_ctrl_callback(struct urb *urb)
 
478
{
 
479
        struct inbuf_t *inbuf = urb->context;
 
480
        struct cardstate *cs = inbuf->cs;
 
481
        struct bas_cardstate *ucs = cs->hw.bas;
 
482
        int status = urb->status;
 
483
        int have_data = 0;
 
484
        unsigned numbytes;
 
485
        int rc;
 
486
 
 
487
        update_basstate(ucs, 0, BS_ATRDPEND);
 
488
        wake_up(&ucs->waitqueue);
 
489
 
 
490
        if (!ucs->rcvbuf_size) {
 
491
                dev_warn(cs->dev, "%s: no receive in progress\n", __func__);
 
492
                return;
 
493
        }
 
494
 
 
495
        del_timer(&ucs->timer_cmd_in);
 
496
 
 
497
        switch (status) {
 
498
        case 0:                         /* normal completion */
 
499
                numbytes = urb->actual_length;
 
500
                if (unlikely(numbytes != ucs->rcvbuf_size)) {
 
501
                        dev_warn(cs->dev,
 
502
                               "control read: received %d chars, expected %d\n",
 
503
                                 numbytes, ucs->rcvbuf_size);
 
504
                        if (numbytes > ucs->rcvbuf_size)
 
505
                                numbytes = ucs->rcvbuf_size;
 
506
                }
 
507
 
 
508
                /* copy received bytes to inbuf */
 
509
                have_data = gigaset_fill_inbuf(inbuf, ucs->rcvbuf, numbytes);
 
510
 
 
511
                if (unlikely(numbytes < ucs->rcvbuf_size)) {
 
512
                        /* incomplete - resubmit for remaining bytes */
 
513
                        ucs->rcvbuf_size -= numbytes;
 
514
                        ucs->retry_cmd_in = 0;
 
515
                        rc = atread_submit(cs, BAS_TIMEOUT);
 
516
                        if (rc >= 0 || rc == -ENODEV)
 
517
                                /* resubmitted or disconnected */
 
518
                                /* - bypass regular exit block */
 
519
                                return;
 
520
                        error_reset(cs);
 
521
                }
 
522
                break;
 
523
 
 
524
        case -ENOENT:                   /* cancelled */
 
525
        case -ECONNRESET:               /* cancelled (async) */
 
526
        case -EINPROGRESS:              /* pending */
 
527
        case -ENODEV:                   /* device removed */
 
528
        case -ESHUTDOWN:                /* device shut down */
 
529
                /* no action necessary */
 
530
                gig_dbg(DEBUG_USBREQ, "%s: %s",
 
531
                        __func__, get_usb_statmsg(status));
 
532
                break;
 
533
 
 
534
        default:                        /* severe trouble */
 
535
                dev_warn(cs->dev, "control read: %s\n",
 
536
                         get_usb_statmsg(status));
 
537
                if (ucs->retry_cmd_in++ < BAS_RETRY) {
 
538
                        dev_notice(cs->dev, "control read: retry %d\n",
 
539
                                   ucs->retry_cmd_in);
 
540
                        rc = atread_submit(cs, BAS_TIMEOUT);
 
541
                        if (rc >= 0 || rc == -ENODEV)
 
542
                                /* resubmitted or disconnected */
 
543
                                /* - bypass regular exit block */
 
544
                                return;
 
545
                } else {
 
546
                        dev_err(cs->dev,
 
547
                                "control read: giving up after %d tries\n",
 
548
                                ucs->retry_cmd_in);
 
549
                }
 
550
                error_reset(cs);
 
551
        }
 
552
 
 
553
        kfree(ucs->rcvbuf);
 
554
        ucs->rcvbuf = NULL;
 
555
        ucs->rcvbuf_size = 0;
 
556
        if (have_data) {
 
557
                gig_dbg(DEBUG_INTR, "%s-->BH", __func__);
 
558
                gigaset_schedule_event(cs);
 
559
        }
 
560
}
 
561
 
 
562
/* atread_submit
 
563
 * submit an HD_READ_ATMESSAGE command URB and optionally start a timeout
 
564
 * parameters:
 
565
 *      cs      controller state structure
 
566
 *      timeout timeout in 1/10 sec., 0: none
 
567
 * return value:
 
568
 *      0 on success
 
569
 *      -EBUSY if another request is pending
 
570
 *      any URB submission error code
 
571
 */
 
572
static int atread_submit(struct cardstate *cs, int timeout)
 
573
{
 
574
        struct bas_cardstate *ucs = cs->hw.bas;
 
575
        int basstate;
 
576
        int ret;
 
577
 
 
578
        gig_dbg(DEBUG_USBREQ, "-------> HD_READ_ATMESSAGE (%d)",
 
579
                ucs->rcvbuf_size);
 
580
 
 
581
        basstate = update_basstate(ucs, BS_ATRDPEND, 0);
 
582
        if (basstate & BS_ATRDPEND) {
 
583
                dev_err(cs->dev,
 
584
                        "could not submit HD_READ_ATMESSAGE: URB busy\n");
 
585
                return -EBUSY;
 
586
        }
 
587
 
 
588
        if (basstate & BS_SUSPEND) {
 
589
                dev_notice(cs->dev,
 
590
                           "HD_READ_ATMESSAGE not submitted, "
 
591
                           "suspend in progress\n");
 
592
                update_basstate(ucs, 0, BS_ATRDPEND);
 
593
                /* treat like disconnect */
 
594
                return -ENODEV;
 
595
        }
 
596
 
 
597
        ucs->dr_cmd_in.bRequestType = IN_VENDOR_REQ;
 
598
        ucs->dr_cmd_in.bRequest = HD_READ_ATMESSAGE;
 
599
        ucs->dr_cmd_in.wValue = 0;
 
600
        ucs->dr_cmd_in.wIndex = 0;
 
601
        ucs->dr_cmd_in.wLength = cpu_to_le16(ucs->rcvbuf_size);
 
602
        usb_fill_control_urb(ucs->urb_cmd_in, ucs->udev,
 
603
                             usb_rcvctrlpipe(ucs->udev, 0),
 
604
                             (unsigned char *) &ucs->dr_cmd_in,
 
605
                             ucs->rcvbuf, ucs->rcvbuf_size,
 
606
                             read_ctrl_callback, cs->inbuf);
 
607
 
 
608
        ret = usb_submit_urb(ucs->urb_cmd_in, GFP_ATOMIC);
 
609
        if (ret != 0) {
 
610
                update_basstate(ucs, 0, BS_ATRDPEND);
 
611
                dev_err(cs->dev, "could not submit HD_READ_ATMESSAGE: %s\n",
 
612
                        get_usb_rcmsg(ret));
 
613
                return ret;
 
614
        }
 
615
 
 
616
        if (timeout > 0) {
 
617
                gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
 
618
                ucs->timer_cmd_in.expires = jiffies + timeout * HZ / 10;
 
619
                ucs->timer_cmd_in.data = (unsigned long) cs;
 
620
                ucs->timer_cmd_in.function = cmd_in_timeout;
 
621
                add_timer(&ucs->timer_cmd_in);
 
622
        }
 
623
        return 0;
 
624
}
 
625
 
 
626
/* read_int_callback
 
627
 * USB completion handler for interrupt pipe input
 
628
 * called by the USB subsystem in interrupt context
 
629
 * parameter:
 
630
 *      urb     USB request block
 
631
 *              urb->context = controller state structure
 
632
 */
 
633
static void read_int_callback(struct urb *urb)
 
634
{
 
635
        struct cardstate *cs = urb->context;
 
636
        struct bas_cardstate *ucs = cs->hw.bas;
 
637
        struct bc_state *bcs;
 
638
        int status = urb->status;
 
639
        unsigned long flags;
 
640
        int rc;
 
641
        unsigned l;
 
642
        int channel;
 
643
 
 
644
        switch (status) {
 
645
        case 0:                 /* success */
 
646
                break;
 
647
        case -ENOENT:                   /* cancelled */
 
648
        case -ECONNRESET:               /* cancelled (async) */
 
649
        case -EINPROGRESS:              /* pending */
 
650
                /* ignore silently */
 
651
                gig_dbg(DEBUG_USBREQ, "%s: %s",
 
652
                        __func__, get_usb_statmsg(status));
 
653
                return;
 
654
        case -ENODEV:                   /* device removed */
 
655
        case -ESHUTDOWN:                /* device shut down */
 
656
                gig_dbg(DEBUG_USBREQ, "%s: device disconnected", __func__);
 
657
                return;
 
658
        default:                /* severe trouble */
 
659
                dev_warn(cs->dev, "interrupt read: %s\n",
 
660
                         get_usb_statmsg(status));
 
661
                goto resubmit;
 
662
        }
 
663
 
 
664
        /* drop incomplete packets even if the missing bytes wouldn't matter */
 
665
        if (unlikely(urb->actual_length < IP_MSGSIZE)) {
 
666
                dev_warn(cs->dev, "incomplete interrupt packet (%d bytes)\n",
 
667
                         urb->actual_length);
 
668
                goto resubmit;
 
669
        }
 
670
 
 
671
        l = (unsigned) ucs->int_in_buf[1] +
 
672
            (((unsigned) ucs->int_in_buf[2]) << 8);
 
673
 
 
674
        gig_dbg(DEBUG_USBREQ, "<-------%d: 0x%02x (%u [0x%02x 0x%02x])",
 
675
                urb->actual_length, (int)ucs->int_in_buf[0], l,
 
676
                (int)ucs->int_in_buf[1], (int)ucs->int_in_buf[2]);
 
677
 
 
678
        channel = 0;
 
679
 
 
680
        switch (ucs->int_in_buf[0]) {
 
681
        case HD_DEVICE_INIT_OK:
 
682
                update_basstate(ucs, BS_INIT, 0);
 
683
                break;
 
684
 
 
685
        case HD_READY_SEND_ATDATA:
 
686
                del_timer(&ucs->timer_atrdy);
 
687
                update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
 
688
                start_cbsend(cs);
 
689
                break;
 
690
 
 
691
        case HD_OPEN_B2CHANNEL_ACK:
 
692
                ++channel;
 
693
        case HD_OPEN_B1CHANNEL_ACK:
 
694
                bcs = cs->bcs + channel;
 
695
                update_basstate(ucs, BS_B1OPEN << channel, 0);
 
696
                gigaset_bchannel_up(bcs);
 
697
                break;
 
698
 
 
699
        case HD_OPEN_ATCHANNEL_ACK:
 
700
                update_basstate(ucs, BS_ATOPEN, 0);
 
701
                start_cbsend(cs);
 
702
                break;
 
703
 
 
704
        case HD_CLOSE_B2CHANNEL_ACK:
 
705
                ++channel;
 
706
        case HD_CLOSE_B1CHANNEL_ACK:
 
707
                bcs = cs->bcs + channel;
 
708
                update_basstate(ucs, 0, BS_B1OPEN << channel);
 
709
                stopurbs(bcs->hw.bas);
 
710
                gigaset_bchannel_down(bcs);
 
711
                break;
 
712
 
 
713
        case HD_CLOSE_ATCHANNEL_ACK:
 
714
                update_basstate(ucs, 0, BS_ATOPEN);
 
715
                break;
 
716
 
 
717
        case HD_B2_FLOW_CONTROL:
 
718
                ++channel;
 
719
        case HD_B1_FLOW_CONTROL:
 
720
                bcs = cs->bcs + channel;
 
721
                atomic_add((l - BAS_NORMFRAME) * BAS_CORRFRAMES,
 
722
                           &bcs->hw.bas->corrbytes);
 
723
                gig_dbg(DEBUG_ISO,
 
724
                        "Flow control (channel %d, sub %d): 0x%02x => %d",
 
725
                        channel, bcs->hw.bas->numsub, l,
 
726
                        atomic_read(&bcs->hw.bas->corrbytes));
 
727
                break;
 
728
 
 
729
        case HD_RECEIVEATDATA_ACK:      /* AT response ready to be received */
 
730
                if (!l) {
 
731
                        dev_warn(cs->dev,
 
732
                                "HD_RECEIVEATDATA_ACK with length 0 ignored\n");
 
733
                        break;
 
734
                }
 
735
                spin_lock_irqsave(&cs->lock, flags);
 
736
                if (ucs->rcvbuf_size) {
 
737
                        /* throw away previous buffer - we have no queue */
 
738
                        dev_err(cs->dev,
 
739
                                "receive AT data overrun, %d bytes lost\n",
 
740
                                ucs->rcvbuf_size);
 
741
                        kfree(ucs->rcvbuf);
 
742
                        ucs->rcvbuf_size = 0;
 
743
                }
 
744
                ucs->rcvbuf = kmalloc(l, GFP_ATOMIC);
 
745
                if (ucs->rcvbuf == NULL) {
 
746
                        spin_unlock_irqrestore(&cs->lock, flags);
 
747
                        dev_err(cs->dev, "out of memory receiving AT data\n");
 
748
                        error_reset(cs);
 
749
                        break;
 
750
                }
 
751
                ucs->rcvbuf_size = l;
 
752
                ucs->retry_cmd_in = 0;
 
753
                rc = atread_submit(cs, BAS_TIMEOUT);
 
754
                if (rc < 0) {
 
755
                        kfree(ucs->rcvbuf);
 
756
                        ucs->rcvbuf = NULL;
 
757
                        ucs->rcvbuf_size = 0;
 
758
                        if (rc != -ENODEV) {
 
759
                                spin_unlock_irqrestore(&cs->lock, flags);
 
760
                                error_reset(cs);
 
761
                                break;
 
762
                        }
 
763
                }
 
764
                spin_unlock_irqrestore(&cs->lock, flags);
 
765
                break;
 
766
 
 
767
        case HD_RESET_INTERRUPT_PIPE_ACK:
 
768
                update_basstate(ucs, 0, BS_RESETTING);
 
769
                dev_notice(cs->dev, "interrupt pipe reset\n");
 
770
                break;
 
771
 
 
772
        case HD_SUSPEND_END:
 
773
                gig_dbg(DEBUG_USBREQ, "HD_SUSPEND_END");
 
774
                break;
 
775
 
 
776
        default:
 
777
                dev_warn(cs->dev,
 
778
                         "unknown Gigaset signal 0x%02x (%u) ignored\n",
 
779
                         (int) ucs->int_in_buf[0], l);
 
780
        }
 
781
 
 
782
        check_pending(ucs);
 
783
        wake_up(&ucs->waitqueue);
 
784
 
 
785
resubmit:
 
786
        rc = usb_submit_urb(urb, GFP_ATOMIC);
 
787
        if (unlikely(rc != 0 && rc != -ENODEV)) {
 
788
                dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
 
789
                        get_usb_rcmsg(rc));
 
790
                error_reset(cs);
 
791
        }
 
792
}
 
793
 
 
794
/* read_iso_callback
 
795
 * USB completion handler for B channel isochronous input
 
796
 * called by the USB subsystem in interrupt context
 
797
 * parameter:
 
798
 *      urb     USB request block of completed request
 
799
 *              urb->context = bc_state structure
 
800
 */
 
801
static void read_iso_callback(struct urb *urb)
 
802
{
 
803
        struct bc_state *bcs;
 
804
        struct bas_bc_state *ubc;
 
805
        int status = urb->status;
 
806
        unsigned long flags;
 
807
        int i, rc;
 
808
 
 
809
        /* status codes not worth bothering the tasklet with */
 
810
        if (unlikely(status == -ENOENT ||
 
811
                     status == -ECONNRESET ||
 
812
                     status == -EINPROGRESS ||
 
813
                     status == -ENODEV ||
 
814
                     status == -ESHUTDOWN)) {
 
815
                gig_dbg(DEBUG_ISO, "%s: %s",
 
816
                        __func__, get_usb_statmsg(status));
 
817
                return;
 
818
        }
 
819
 
 
820
        bcs = urb->context;
 
821
        ubc = bcs->hw.bas;
 
822
 
 
823
        spin_lock_irqsave(&ubc->isoinlock, flags);
 
824
        if (likely(ubc->isoindone == NULL)) {
 
825
                /* pass URB to tasklet */
 
826
                ubc->isoindone = urb;
 
827
                ubc->isoinstatus = status;
 
828
                tasklet_hi_schedule(&ubc->rcvd_tasklet);
 
829
        } else {
 
830
                /* tasklet still busy, drop data and resubmit URB */
 
831
                ubc->loststatus = status;
 
832
                for (i = 0; i < BAS_NUMFRAMES; i++) {
 
833
                        ubc->isoinlost += urb->iso_frame_desc[i].actual_length;
 
834
                        if (unlikely(urb->iso_frame_desc[i].status != 0 &&
 
835
                                     urb->iso_frame_desc[i].status !=
 
836
                                                                -EINPROGRESS))
 
837
                                ubc->loststatus = urb->iso_frame_desc[i].status;
 
838
                        urb->iso_frame_desc[i].status = 0;
 
839
                        urb->iso_frame_desc[i].actual_length = 0;
 
840
                }
 
841
                if (likely(ubc->running)) {
 
842
                        /* urb->dev is clobbered by USB subsystem */
 
843
                        urb->dev = bcs->cs->hw.bas->udev;
 
844
                        urb->transfer_flags = URB_ISO_ASAP;
 
845
                        urb->number_of_packets = BAS_NUMFRAMES;
 
846
                        gig_dbg(DEBUG_ISO, "%s: isoc read overrun/resubmit",
 
847
                                __func__);
 
848
                        rc = usb_submit_urb(urb, GFP_ATOMIC);
 
849
                        if (unlikely(rc != 0 && rc != -ENODEV)) {
 
850
                                dev_err(bcs->cs->dev,
 
851
                                        "could not resubmit isochronous read "
 
852
                                        "URB: %s\n", get_usb_rcmsg(rc));
 
853
                                dump_urb(DEBUG_ISO, "isoc read", urb);
 
854
                                error_hangup(bcs);
 
855
                        }
 
856
                }
 
857
        }
 
858
        spin_unlock_irqrestore(&ubc->isoinlock, flags);
 
859
}
 
860
 
 
861
/* write_iso_callback
 
862
 * USB completion handler for B channel isochronous output
 
863
 * called by the USB subsystem in interrupt context
 
864
 * parameter:
 
865
 *      urb     USB request block of completed request
 
866
 *              urb->context = isow_urbctx_t structure
 
867
 */
 
868
static void write_iso_callback(struct urb *urb)
 
869
{
 
870
        struct isow_urbctx_t *ucx;
 
871
        struct bas_bc_state *ubc;
 
872
        int status = urb->status;
 
873
        unsigned long flags;
 
874
 
 
875
        /* status codes not worth bothering the tasklet with */
 
876
        if (unlikely(status == -ENOENT ||
 
877
                     status == -ECONNRESET ||
 
878
                     status == -EINPROGRESS ||
 
879
                     status == -ENODEV ||
 
880
                     status == -ESHUTDOWN)) {
 
881
                gig_dbg(DEBUG_ISO, "%s: %s",
 
882
                        __func__, get_usb_statmsg(status));
 
883
                return;
 
884
        }
 
885
 
 
886
        /* pass URB context to tasklet */
 
887
        ucx = urb->context;
 
888
        ubc = ucx->bcs->hw.bas;
 
889
        ucx->status = status;
 
890
 
 
891
        spin_lock_irqsave(&ubc->isooutlock, flags);
 
892
        ubc->isooutovfl = ubc->isooutdone;
 
893
        ubc->isooutdone = ucx;
 
894
        spin_unlock_irqrestore(&ubc->isooutlock, flags);
 
895
        tasklet_hi_schedule(&ubc->sent_tasklet);
 
896
}
 
897
 
 
898
/* starturbs
 
899
 * prepare and submit USB request blocks for isochronous input and output
 
900
 * argument:
 
901
 *      B channel control structure
 
902
 * return value:
 
903
 *      0 on success
 
904
 *      < 0 on error (no URBs submitted)
 
905
 */
 
906
static int starturbs(struct bc_state *bcs)
 
907
{
 
908
        struct bas_bc_state *ubc = bcs->hw.bas;
 
909
        struct urb *urb;
 
910
        int j, k;
 
911
        int rc;
 
912
 
 
913
        /* initialize L2 reception */
 
914
        if (bcs->proto2 == L2_HDLC)
 
915
                bcs->inputstate |= INS_flag_hunt;
 
916
 
 
917
        /* submit all isochronous input URBs */
 
918
        ubc->running = 1;
 
919
        for (k = 0; k < BAS_INURBS; k++) {
 
920
                urb = ubc->isoinurbs[k];
 
921
                if (!urb) {
 
922
                        rc = -EFAULT;
 
923
                        goto error;
 
924
                }
 
925
 
 
926
                urb->dev = bcs->cs->hw.bas->udev;
 
927
                urb->pipe = usb_rcvisocpipe(urb->dev, 3 + 2 * bcs->channel);
 
928
                urb->transfer_flags = URB_ISO_ASAP;
 
929
                urb->transfer_buffer = ubc->isoinbuf + k * BAS_INBUFSIZE;
 
930
                urb->transfer_buffer_length = BAS_INBUFSIZE;
 
931
                urb->number_of_packets = BAS_NUMFRAMES;
 
932
                urb->interval = BAS_FRAMETIME;
 
933
                urb->complete = read_iso_callback;
 
934
                urb->context = bcs;
 
935
                for (j = 0; j < BAS_NUMFRAMES; j++) {
 
936
                        urb->iso_frame_desc[j].offset = j * BAS_MAXFRAME;
 
937
                        urb->iso_frame_desc[j].length = BAS_MAXFRAME;
 
938
                        urb->iso_frame_desc[j].status = 0;
 
939
                        urb->iso_frame_desc[j].actual_length = 0;
 
940
                }
 
941
 
 
942
                dump_urb(DEBUG_ISO, "Initial isoc read", urb);
 
943
                rc = usb_submit_urb(urb, GFP_ATOMIC);
 
944
                if (rc != 0)
 
945
                        goto error;
 
946
        }
 
947
 
 
948
        /* initialize L2 transmission */
 
949
        gigaset_isowbuf_init(ubc->isooutbuf, PPP_FLAG);
 
950
 
 
951
        /* set up isochronous output URBs for flag idling */
 
952
        for (k = 0; k < BAS_OUTURBS; ++k) {
 
953
                urb = ubc->isoouturbs[k].urb;
 
954
                if (!urb) {
 
955
                        rc = -EFAULT;
 
956
                        goto error;
 
957
                }
 
958
                urb->dev = bcs->cs->hw.bas->udev;
 
959
                urb->pipe = usb_sndisocpipe(urb->dev, 4 + 2 * bcs->channel);
 
960
                urb->transfer_flags = URB_ISO_ASAP;
 
961
                urb->transfer_buffer = ubc->isooutbuf->data;
 
962
                urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
 
963
                urb->number_of_packets = BAS_NUMFRAMES;
 
964
                urb->interval = BAS_FRAMETIME;
 
965
                urb->complete = write_iso_callback;
 
966
                urb->context = &ubc->isoouturbs[k];
 
967
                for (j = 0; j < BAS_NUMFRAMES; ++j) {
 
968
                        urb->iso_frame_desc[j].offset = BAS_OUTBUFSIZE;
 
969
                        urb->iso_frame_desc[j].length = BAS_NORMFRAME;
 
970
                        urb->iso_frame_desc[j].status = 0;
 
971
                        urb->iso_frame_desc[j].actual_length = 0;
 
972
                }
 
973
                ubc->isoouturbs[k].limit = -1;
 
974
        }
 
975
 
 
976
        /* keep one URB free, submit the others */
 
977
        for (k = 0; k < BAS_OUTURBS-1; ++k) {
 
978
                dump_urb(DEBUG_ISO, "Initial isoc write", urb);
 
979
                rc = usb_submit_urb(ubc->isoouturbs[k].urb, GFP_ATOMIC);
 
980
                if (rc != 0)
 
981
                        goto error;
 
982
        }
 
983
        dump_urb(DEBUG_ISO, "Initial isoc write (free)", urb);
 
984
        ubc->isooutfree = &ubc->isoouturbs[BAS_OUTURBS-1];
 
985
        ubc->isooutdone = ubc->isooutovfl = NULL;
 
986
        return 0;
 
987
 error:
 
988
        stopurbs(ubc);
 
989
        return rc;
 
990
}
 
991
 
 
992
/* stopurbs
 
993
 * cancel the USB request blocks for isochronous input and output
 
994
 * errors are silently ignored
 
995
 * argument:
 
996
 *      B channel control structure
 
997
 */
 
998
static void stopurbs(struct bas_bc_state *ubc)
 
999
{
 
1000
        int k, rc;
 
1001
 
 
1002
        ubc->running = 0;
 
1003
 
 
1004
        for (k = 0; k < BAS_INURBS; ++k) {
 
1005
                rc = usb_unlink_urb(ubc->isoinurbs[k]);
 
1006
                gig_dbg(DEBUG_ISO,
 
1007
                        "%s: isoc input URB %d unlinked, result = %s",
 
1008
                        __func__, k, get_usb_rcmsg(rc));
 
1009
        }
 
1010
 
 
1011
        for (k = 0; k < BAS_OUTURBS; ++k) {
 
1012
                rc = usb_unlink_urb(ubc->isoouturbs[k].urb);
 
1013
                gig_dbg(DEBUG_ISO,
 
1014
                        "%s: isoc output URB %d unlinked, result = %s",
 
1015
                        __func__, k, get_usb_rcmsg(rc));
 
1016
        }
 
1017
}
 
1018
 
 
1019
/* Isochronous Write - Bottom Half */
 
1020
/* =============================== */
 
1021
 
 
1022
/* submit_iso_write_urb
 
1023
 * fill and submit the next isochronous write URB
 
1024
 * parameters:
 
1025
 *      ucx     context structure containing URB
 
1026
 * return value:
 
1027
 *      number of frames submitted in URB
 
1028
 *      0 if URB not submitted because no data available (isooutbuf busy)
 
1029
 *      error code < 0 on error
 
1030
 */
 
1031
static int submit_iso_write_urb(struct isow_urbctx_t *ucx)
 
1032
{
 
1033
        struct urb *urb = ucx->urb;
 
1034
        struct bas_bc_state *ubc = ucx->bcs->hw.bas;
 
1035
        struct usb_iso_packet_descriptor *ifd;
 
1036
        int corrbytes, nframe, rc;
 
1037
 
 
1038
        /* urb->dev is clobbered by USB subsystem */
 
1039
        urb->dev = ucx->bcs->cs->hw.bas->udev;
 
1040
        urb->transfer_flags = URB_ISO_ASAP;
 
1041
        urb->transfer_buffer = ubc->isooutbuf->data;
 
1042
        urb->transfer_buffer_length = sizeof(ubc->isooutbuf->data);
 
1043
 
 
1044
        for (nframe = 0; nframe < BAS_NUMFRAMES; nframe++) {
 
1045
                ifd = &urb->iso_frame_desc[nframe];
 
1046
 
 
1047
                /* compute frame length according to flow control */
 
1048
                ifd->length = BAS_NORMFRAME;
 
1049
                corrbytes = atomic_read(&ubc->corrbytes);
 
1050
                if (corrbytes != 0) {
 
1051
                        gig_dbg(DEBUG_ISO, "%s: corrbytes=%d",
 
1052
                                __func__, corrbytes);
 
1053
                        if (corrbytes > BAS_HIGHFRAME - BAS_NORMFRAME)
 
1054
                                corrbytes = BAS_HIGHFRAME - BAS_NORMFRAME;
 
1055
                        else if (corrbytes < BAS_LOWFRAME - BAS_NORMFRAME)
 
1056
                                corrbytes = BAS_LOWFRAME - BAS_NORMFRAME;
 
1057
                        ifd->length += corrbytes;
 
1058
                        atomic_add(-corrbytes, &ubc->corrbytes);
 
1059
                }
 
1060
 
 
1061
                /* retrieve block of data to send */
 
1062
                rc = gigaset_isowbuf_getbytes(ubc->isooutbuf, ifd->length);
 
1063
                if (rc < 0) {
 
1064
                        if (rc == -EBUSY) {
 
1065
                                gig_dbg(DEBUG_ISO,
 
1066
                                        "%s: buffer busy at frame %d",
 
1067
                                        __func__, nframe);
 
1068
                                /* tasklet will be restarted from
 
1069
                                   gigaset_isoc_send_skb() */
 
1070
                        } else {
 
1071
                                dev_err(ucx->bcs->cs->dev,
 
1072
                                        "%s: buffer error %d at frame %d\n",
 
1073
                                        __func__, rc, nframe);
 
1074
                                return rc;
 
1075
                        }
 
1076
                        break;
 
1077
                }
 
1078
                ifd->offset = rc;
 
1079
                ucx->limit = ubc->isooutbuf->nextread;
 
1080
                ifd->status = 0;
 
1081
                ifd->actual_length = 0;
 
1082
        }
 
1083
        if (unlikely(nframe == 0))
 
1084
                return 0;       /* no data to send */
 
1085
        urb->number_of_packets = nframe;
 
1086
 
 
1087
        rc = usb_submit_urb(urb, GFP_ATOMIC);
 
1088
        if (unlikely(rc)) {
 
1089
                if (rc == -ENODEV)
 
1090
                        /* device removed - give up silently */
 
1091
                        gig_dbg(DEBUG_ISO, "%s: disconnected", __func__);
 
1092
                else
 
1093
                        dev_err(ucx->bcs->cs->dev,
 
1094
                                "could not submit isochronous write URB: %s\n",
 
1095
                                get_usb_rcmsg(rc));
 
1096
                return rc;
 
1097
        }
 
1098
        ++ubc->numsub;
 
1099
        return nframe;
 
1100
}
 
1101
 
 
1102
/* write_iso_tasklet
 
1103
 * tasklet scheduled when an isochronous output URB from the Gigaset device
 
1104
 * has completed
 
1105
 * parameter:
 
1106
 *      data    B channel state structure
 
1107
 */
 
1108
static void write_iso_tasklet(unsigned long data)
 
1109
{
 
1110
        struct bc_state *bcs = (struct bc_state *) data;
 
1111
        struct bas_bc_state *ubc = bcs->hw.bas;
 
1112
        struct cardstate *cs = bcs->cs;
 
1113
        struct isow_urbctx_t *done, *next, *ovfl;
 
1114
        struct urb *urb;
 
1115
        int status;
 
1116
        struct usb_iso_packet_descriptor *ifd;
 
1117
        int offset;
 
1118
        unsigned long flags;
 
1119
        int i;
 
1120
        struct sk_buff *skb;
 
1121
        int len;
 
1122
        int rc;
 
1123
 
 
1124
        /* loop while completed URBs arrive in time */
 
1125
        for (;;) {
 
1126
                if (unlikely(!(ubc->running))) {
 
1127
                        gig_dbg(DEBUG_ISO, "%s: not running", __func__);
 
1128
                        return;
 
1129
                }
 
1130
 
 
1131
                /* retrieve completed URBs */
 
1132
                spin_lock_irqsave(&ubc->isooutlock, flags);
 
1133
                done = ubc->isooutdone;
 
1134
                ubc->isooutdone = NULL;
 
1135
                ovfl = ubc->isooutovfl;
 
1136
                ubc->isooutovfl = NULL;
 
1137
                spin_unlock_irqrestore(&ubc->isooutlock, flags);
 
1138
                if (ovfl) {
 
1139
                        dev_err(cs->dev, "isochronous write buffer underrun\n");
 
1140
                        error_hangup(bcs);
 
1141
                        break;
 
1142
                }
 
1143
                if (!done)
 
1144
                        break;
 
1145
 
 
1146
                /* submit free URB if available */
 
1147
                spin_lock_irqsave(&ubc->isooutlock, flags);
 
1148
                next = ubc->isooutfree;
 
1149
                ubc->isooutfree = NULL;
 
1150
                spin_unlock_irqrestore(&ubc->isooutlock, flags);
 
1151
                if (next) {
 
1152
                        rc = submit_iso_write_urb(next);
 
1153
                        if (unlikely(rc <= 0 && rc != -ENODEV)) {
 
1154
                                /* could not submit URB, put it back */
 
1155
                                spin_lock_irqsave(&ubc->isooutlock, flags);
 
1156
                                if (ubc->isooutfree == NULL) {
 
1157
                                        ubc->isooutfree = next;
 
1158
                                        next = NULL;
 
1159
                                }
 
1160
                                spin_unlock_irqrestore(&ubc->isooutlock, flags);
 
1161
                                if (next) {
 
1162
                                        /* couldn't put it back */
 
1163
                                        dev_err(cs->dev,
 
1164
                                              "losing isochronous write URB\n");
 
1165
                                        error_hangup(bcs);
 
1166
                                }
 
1167
                        }
 
1168
                }
 
1169
 
 
1170
                /* process completed URB */
 
1171
                urb = done->urb;
 
1172
                status = done->status;
 
1173
                switch (status) {
 
1174
                case -EXDEV:                    /* partial completion */
 
1175
                        gig_dbg(DEBUG_ISO, "%s: URB partially completed",
 
1176
                                __func__);
 
1177
                        /* fall through - what's the difference anyway? */
 
1178
                case 0:                         /* normal completion */
 
1179
                        /* inspect individual frames
 
1180
                         * assumptions (for lack of documentation):
 
1181
                         * - actual_length bytes of first frame in error are
 
1182
                         *   successfully sent
 
1183
                         * - all following frames are not sent at all
 
1184
                         */
 
1185
                        offset = done->limit;   /* default (no error) */
 
1186
                        for (i = 0; i < BAS_NUMFRAMES; i++) {
 
1187
                                ifd = &urb->iso_frame_desc[i];
 
1188
                                if (ifd->status ||
 
1189
                                    ifd->actual_length != ifd->length) {
 
1190
                                        dev_warn(cs->dev,
 
1191
                                             "isochronous write: frame %d: %s, "
 
1192
                                             "only %d of %d bytes sent\n",
 
1193
                                             i, get_usb_statmsg(ifd->status),
 
1194
                                             ifd->actual_length, ifd->length);
 
1195
                                        offset = (ifd->offset +
 
1196
                                                  ifd->actual_length)
 
1197
                                                 % BAS_OUTBUFSIZE;
 
1198
                                        break;
 
1199
                                }
 
1200
                        }
 
1201
#ifdef CONFIG_GIGASET_DEBUG
 
1202
                        /* check assumption on remaining frames */
 
1203
                        for (; i < BAS_NUMFRAMES; i++) {
 
1204
                                ifd = &urb->iso_frame_desc[i];
 
1205
                                if (ifd->status != -EINPROGRESS
 
1206
                                    || ifd->actual_length != 0) {
 
1207
                                        dev_warn(cs->dev,
 
1208
                                             "isochronous write: frame %d: %s, "
 
1209
                                             "%d of %d bytes sent\n",
 
1210
                                             i, get_usb_statmsg(ifd->status),
 
1211
                                             ifd->actual_length, ifd->length);
 
1212
                                        offset = (ifd->offset +
 
1213
                                                  ifd->actual_length)
 
1214
                                                 % BAS_OUTBUFSIZE;
 
1215
                                        break;
 
1216
                                }
 
1217
                        }
 
1218
#endif
 
1219
                        break;
 
1220
                case -EPIPE:                    /* stall - probably underrun */
 
1221
                        dev_err(cs->dev, "isochronous write stalled\n");
 
1222
                        error_hangup(bcs);
 
1223
                        break;
 
1224
                default:                        /* severe trouble */
 
1225
                        dev_warn(cs->dev, "isochronous write: %s\n",
 
1226
                                 get_usb_statmsg(status));
 
1227
                }
 
1228
 
 
1229
                /* mark the write buffer area covered by this URB as free */
 
1230
                if (done->limit >= 0)
 
1231
                        ubc->isooutbuf->read = done->limit;
 
1232
 
 
1233
                /* mark URB as free */
 
1234
                spin_lock_irqsave(&ubc->isooutlock, flags);
 
1235
                next = ubc->isooutfree;
 
1236
                ubc->isooutfree = done;
 
1237
                spin_unlock_irqrestore(&ubc->isooutlock, flags);
 
1238
                if (next) {
 
1239
                        /* only one URB still active - resubmit one */
 
1240
                        rc = submit_iso_write_urb(next);
 
1241
                        if (unlikely(rc <= 0 && rc != -ENODEV)) {
 
1242
                                /* couldn't submit */
 
1243
                                error_hangup(bcs);
 
1244
                        }
 
1245
                }
 
1246
        }
 
1247
 
 
1248
        /* process queued SKBs */
 
1249
        while ((skb = skb_dequeue(&bcs->squeue))) {
 
1250
                /* copy to output buffer, doing L2 encapsulation */
 
1251
                len = skb->len;
 
1252
                if (gigaset_isoc_buildframe(bcs, skb->data, len) == -EAGAIN) {
 
1253
                        /* insufficient buffer space, push back onto queue */
 
1254
                        skb_queue_head(&bcs->squeue, skb);
 
1255
                        gig_dbg(DEBUG_ISO, "%s: skb requeued, qlen=%d",
 
1256
                                __func__, skb_queue_len(&bcs->squeue));
 
1257
                        break;
 
1258
                }
 
1259
                skb_pull(skb, len);
 
1260
                gigaset_skb_sent(bcs, skb);
 
1261
                dev_kfree_skb_any(skb);
 
1262
        }
 
1263
}
 
1264
 
 
1265
/* Isochronous Read - Bottom Half */
 
1266
/* ============================== */
 
1267
 
 
1268
/* read_iso_tasklet
 
1269
 * tasklet scheduled when an isochronous input URB from the Gigaset device
 
1270
 * has completed
 
1271
 * parameter:
 
1272
 *      data    B channel state structure
 
1273
 */
 
1274
static void read_iso_tasklet(unsigned long data)
 
1275
{
 
1276
        struct bc_state *bcs = (struct bc_state *) data;
 
1277
        struct bas_bc_state *ubc = bcs->hw.bas;
 
1278
        struct cardstate *cs = bcs->cs;
 
1279
        struct urb *urb;
 
1280
        int status;
 
1281
        char *rcvbuf;
 
1282
        unsigned long flags;
 
1283
        int totleft, numbytes, offset, frame, rc;
 
1284
 
 
1285
        /* loop while more completed URBs arrive in the meantime */
 
1286
        for (;;) {
 
1287
                /* retrieve URB */
 
1288
                spin_lock_irqsave(&ubc->isoinlock, flags);
 
1289
                urb = ubc->isoindone;
 
1290
                if (!urb) {
 
1291
                        spin_unlock_irqrestore(&ubc->isoinlock, flags);
 
1292
                        return;
 
1293
                }
 
1294
                status = ubc->isoinstatus;
 
1295
                ubc->isoindone = NULL;
 
1296
                if (unlikely(ubc->loststatus != -EINPROGRESS)) {
 
1297
                        dev_warn(cs->dev,
 
1298
                                 "isochronous read overrun, "
 
1299
                                 "dropped URB with status: %s, %d bytes lost\n",
 
1300
                                 get_usb_statmsg(ubc->loststatus),
 
1301
                                 ubc->isoinlost);
 
1302
                        ubc->loststatus = -EINPROGRESS;
 
1303
                }
 
1304
                spin_unlock_irqrestore(&ubc->isoinlock, flags);
 
1305
 
 
1306
                if (unlikely(!(ubc->running))) {
 
1307
                        gig_dbg(DEBUG_ISO,
 
1308
                                "%s: channel not running, "
 
1309
                                "dropped URB with status: %s",
 
1310
                                __func__, get_usb_statmsg(status));
 
1311
                        return;
 
1312
                }
 
1313
 
 
1314
                switch (status) {
 
1315
                case 0:                         /* normal completion */
 
1316
                        break;
 
1317
                case -EXDEV:                    /* inspect individual frames
 
1318
                                                   (we do that anyway) */
 
1319
                        gig_dbg(DEBUG_ISO, "%s: URB partially completed",
 
1320
                                __func__);
 
1321
                        break;
 
1322
                case -ENOENT:
 
1323
                case -ECONNRESET:
 
1324
                case -EINPROGRESS:
 
1325
                        gig_dbg(DEBUG_ISO, "%s: %s",
 
1326
                                __func__, get_usb_statmsg(status));
 
1327
                        continue;               /* -> skip */
 
1328
                case -EPIPE:
 
1329
                        dev_err(cs->dev, "isochronous read stalled\n");
 
1330
                        error_hangup(bcs);
 
1331
                        continue;               /* -> skip */
 
1332
                default:                        /* severe trouble */
 
1333
                        dev_warn(cs->dev, "isochronous read: %s\n",
 
1334
                                 get_usb_statmsg(status));
 
1335
                        goto error;
 
1336
                }
 
1337
 
 
1338
                rcvbuf = urb->transfer_buffer;
 
1339
                totleft = urb->actual_length;
 
1340
                for (frame = 0; totleft > 0 && frame < BAS_NUMFRAMES; frame++) {
 
1341
                        numbytes = urb->iso_frame_desc[frame].actual_length;
 
1342
                        if (unlikely(urb->iso_frame_desc[frame].status))
 
1343
                                dev_warn(cs->dev,
 
1344
                                         "isochronous read: frame %d[%d]: %s\n",
 
1345
                                         frame, numbytes,
 
1346
                                         get_usb_statmsg(
 
1347
                                            urb->iso_frame_desc[frame].status));
 
1348
                        if (unlikely(numbytes > BAS_MAXFRAME))
 
1349
                                dev_warn(cs->dev,
 
1350
                                         "isochronous read: frame %d: "
 
1351
                                         "numbytes (%d) > BAS_MAXFRAME\n",
 
1352
                                         frame, numbytes);
 
1353
                        if (unlikely(numbytes > totleft)) {
 
1354
                                dev_warn(cs->dev,
 
1355
                                         "isochronous read: frame %d: "
 
1356
                                         "numbytes (%d) > totleft (%d)\n",
 
1357
                                         frame, numbytes, totleft);
 
1358
                                numbytes = totleft;
 
1359
                        }
 
1360
                        offset = urb->iso_frame_desc[frame].offset;
 
1361
                        if (unlikely(offset + numbytes > BAS_INBUFSIZE)) {
 
1362
                                dev_warn(cs->dev,
 
1363
                                         "isochronous read: frame %d: "
 
1364
                                         "offset (%d) + numbytes (%d) "
 
1365
                                         "> BAS_INBUFSIZE\n",
 
1366
                                         frame, offset, numbytes);
 
1367
                                numbytes = BAS_INBUFSIZE - offset;
 
1368
                        }
 
1369
                        gigaset_isoc_receive(rcvbuf + offset, numbytes, bcs);
 
1370
                        totleft -= numbytes;
 
1371
                }
 
1372
                if (unlikely(totleft > 0))
 
1373
                        dev_warn(cs->dev,
 
1374
                                 "isochronous read: %d data bytes missing\n",
 
1375
                                 totleft);
 
1376
 
 
1377
error:
 
1378
                /* URB processed, resubmit */
 
1379
                for (frame = 0; frame < BAS_NUMFRAMES; frame++) {
 
1380
                        urb->iso_frame_desc[frame].status = 0;
 
1381
                        urb->iso_frame_desc[frame].actual_length = 0;
 
1382
                }
 
1383
                /* urb->dev is clobbered by USB subsystem */
 
1384
                urb->dev = bcs->cs->hw.bas->udev;
 
1385
                urb->transfer_flags = URB_ISO_ASAP;
 
1386
                urb->number_of_packets = BAS_NUMFRAMES;
 
1387
                rc = usb_submit_urb(urb, GFP_ATOMIC);
 
1388
                if (unlikely(rc != 0 && rc != -ENODEV)) {
 
1389
                        dev_err(cs->dev,
 
1390
                                "could not resubmit isochronous read URB: %s\n",
 
1391
                                get_usb_rcmsg(rc));
 
1392
                        dump_urb(DEBUG_ISO, "resubmit iso read", urb);
 
1393
                        error_hangup(bcs);
 
1394
                }
 
1395
        }
 
1396
}
 
1397
 
 
1398
/* Channel Operations */
 
1399
/* ================== */
 
1400
 
 
1401
/* req_timeout
 
1402
 * timeout routine for control output request
 
1403
 * argument:
 
1404
 *      B channel control structure
 
1405
 */
 
1406
static void req_timeout(unsigned long data)
 
1407
{
 
1408
        struct bc_state *bcs = (struct bc_state *) data;
 
1409
        struct bas_cardstate *ucs = bcs->cs->hw.bas;
 
1410
        int pending;
 
1411
        unsigned long flags;
 
1412
 
 
1413
        check_pending(ucs);
 
1414
 
 
1415
        spin_lock_irqsave(&ucs->lock, flags);
 
1416
        pending = ucs->pending;
 
1417
        ucs->pending = 0;
 
1418
        spin_unlock_irqrestore(&ucs->lock, flags);
 
1419
 
 
1420
        switch (pending) {
 
1421
        case 0:                                 /* no pending request */
 
1422
                gig_dbg(DEBUG_USBREQ, "%s: no request pending", __func__);
 
1423
                break;
 
1424
 
 
1425
        case HD_OPEN_ATCHANNEL:
 
1426
                dev_err(bcs->cs->dev, "timeout opening AT channel\n");
 
1427
                error_reset(bcs->cs);
 
1428
                break;
 
1429
 
 
1430
        case HD_OPEN_B2CHANNEL:
 
1431
        case HD_OPEN_B1CHANNEL:
 
1432
                dev_err(bcs->cs->dev, "timeout opening channel %d\n",
 
1433
                        bcs->channel + 1);
 
1434
                error_hangup(bcs);
 
1435
                break;
 
1436
 
 
1437
        case HD_CLOSE_ATCHANNEL:
 
1438
                dev_err(bcs->cs->dev, "timeout closing AT channel\n");
 
1439
                error_reset(bcs->cs);
 
1440
                break;
 
1441
 
 
1442
        case HD_CLOSE_B2CHANNEL:
 
1443
        case HD_CLOSE_B1CHANNEL:
 
1444
                dev_err(bcs->cs->dev, "timeout closing channel %d\n",
 
1445
                        bcs->channel + 1);
 
1446
                error_reset(bcs->cs);
 
1447
                break;
 
1448
 
 
1449
        case HD_RESET_INTERRUPT_PIPE:
 
1450
                /* error recovery escalation */
 
1451
                dev_err(bcs->cs->dev,
 
1452
                        "reset interrupt pipe timeout, attempting USB reset\n");
 
1453
                usb_queue_reset_device(bcs->cs->hw.bas->interface);
 
1454
                break;
 
1455
 
 
1456
        default:
 
1457
                dev_warn(bcs->cs->dev, "request 0x%02x timed out, clearing\n",
 
1458
                         pending);
 
1459
        }
 
1460
 
 
1461
        wake_up(&ucs->waitqueue);
 
1462
}
 
1463
 
 
1464
/* write_ctrl_callback
 
1465
 * USB completion handler for control pipe output
 
1466
 * called by the USB subsystem in interrupt context
 
1467
 * parameter:
 
1468
 *      urb     USB request block of completed request
 
1469
 *              urb->context = hardware specific controller state structure
 
1470
 */
 
1471
static void write_ctrl_callback(struct urb *urb)
 
1472
{
 
1473
        struct bas_cardstate *ucs = urb->context;
 
1474
        int status = urb->status;
 
1475
        int rc;
 
1476
        unsigned long flags;
 
1477
 
 
1478
        /* check status */
 
1479
        switch (status) {
 
1480
        case 0:                                 /* normal completion */
 
1481
                spin_lock_irqsave(&ucs->lock, flags);
 
1482
                switch (ucs->pending) {
 
1483
                case HD_DEVICE_INIT_ACK:        /* no reply expected */
 
1484
                        del_timer(&ucs->timer_ctrl);
 
1485
                        ucs->pending = 0;
 
1486
                        break;
 
1487
                }
 
1488
                spin_unlock_irqrestore(&ucs->lock, flags);
 
1489
                return;
 
1490
 
 
1491
        case -ENOENT:                   /* cancelled */
 
1492
        case -ECONNRESET:               /* cancelled (async) */
 
1493
        case -EINPROGRESS:              /* pending */
 
1494
        case -ENODEV:                   /* device removed */
 
1495
        case -ESHUTDOWN:                /* device shut down */
 
1496
                /* ignore silently */
 
1497
                gig_dbg(DEBUG_USBREQ, "%s: %s",
 
1498
                        __func__, get_usb_statmsg(status));
 
1499
                break;
 
1500
 
 
1501
        default:                                /* any failure */
 
1502
                /* don't retry if suspend requested */
 
1503
                if (++ucs->retry_ctrl > BAS_RETRY ||
 
1504
                    (ucs->basstate & BS_SUSPEND)) {
 
1505
                        dev_err(&ucs->interface->dev,
 
1506
                                "control request 0x%02x failed: %s\n",
 
1507
                                ucs->dr_ctrl.bRequest,
 
1508
                                get_usb_statmsg(status));
 
1509
                        break;          /* give up */
 
1510
                }
 
1511
                dev_notice(&ucs->interface->dev,
 
1512
                           "control request 0x%02x: %s, retry %d\n",
 
1513
                           ucs->dr_ctrl.bRequest, get_usb_statmsg(status),
 
1514
                           ucs->retry_ctrl);
 
1515
                /* urb->dev is clobbered by USB subsystem */
 
1516
                urb->dev = ucs->udev;
 
1517
                rc = usb_submit_urb(urb, GFP_ATOMIC);
 
1518
                if (unlikely(rc)) {
 
1519
                        dev_err(&ucs->interface->dev,
 
1520
                                "could not resubmit request 0x%02x: %s\n",
 
1521
                                ucs->dr_ctrl.bRequest, get_usb_rcmsg(rc));
 
1522
                        break;
 
1523
                }
 
1524
                /* resubmitted */
 
1525
                return;
 
1526
        }
 
1527
 
 
1528
        /* failed, clear pending request */
 
1529
        spin_lock_irqsave(&ucs->lock, flags);
 
1530
        del_timer(&ucs->timer_ctrl);
 
1531
        ucs->pending = 0;
 
1532
        spin_unlock_irqrestore(&ucs->lock, flags);
 
1533
        wake_up(&ucs->waitqueue);
 
1534
}
 
1535
 
 
1536
/* req_submit
 
1537
 * submit a control output request without message buffer to the Gigaset base
 
1538
 * and optionally start a timeout
 
1539
 * parameters:
 
1540
 *      bcs     B channel control structure
 
1541
 *      req     control request code (HD_*)
 
1542
 *      val     control request parameter value (set to 0 if unused)
 
1543
 *      timeout timeout in seconds (0: no timeout)
 
1544
 * return value:
 
1545
 *      0 on success
 
1546
 *      -EBUSY if another request is pending
 
1547
 *      any URB submission error code
 
1548
 */
 
1549
static int req_submit(struct bc_state *bcs, int req, int val, int timeout)
 
1550
{
 
1551
        struct bas_cardstate *ucs = bcs->cs->hw.bas;
 
1552
        int ret;
 
1553
        unsigned long flags;
 
1554
 
 
1555
        gig_dbg(DEBUG_USBREQ, "-------> 0x%02x (%d)", req, val);
 
1556
 
 
1557
        spin_lock_irqsave(&ucs->lock, flags);
 
1558
        if (ucs->pending) {
 
1559
                spin_unlock_irqrestore(&ucs->lock, flags);
 
1560
                dev_err(bcs->cs->dev,
 
1561
                        "submission of request 0x%02x failed: "
 
1562
                        "request 0x%02x still pending\n",
 
1563
                        req, ucs->pending);
 
1564
                return -EBUSY;
 
1565
        }
 
1566
 
 
1567
        ucs->dr_ctrl.bRequestType = OUT_VENDOR_REQ;
 
1568
        ucs->dr_ctrl.bRequest = req;
 
1569
        ucs->dr_ctrl.wValue = cpu_to_le16(val);
 
1570
        ucs->dr_ctrl.wIndex = 0;
 
1571
        ucs->dr_ctrl.wLength = 0;
 
1572
        usb_fill_control_urb(ucs->urb_ctrl, ucs->udev,
 
1573
                             usb_sndctrlpipe(ucs->udev, 0),
 
1574
                             (unsigned char *) &ucs->dr_ctrl, NULL, 0,
 
1575
                             write_ctrl_callback, ucs);
 
1576
        ucs->retry_ctrl = 0;
 
1577
        ret = usb_submit_urb(ucs->urb_ctrl, GFP_ATOMIC);
 
1578
        if (unlikely(ret)) {
 
1579
                dev_err(bcs->cs->dev, "could not submit request 0x%02x: %s\n",
 
1580
                        req, get_usb_rcmsg(ret));
 
1581
                spin_unlock_irqrestore(&ucs->lock, flags);
 
1582
                return ret;
 
1583
        }
 
1584
        ucs->pending = req;
 
1585
 
 
1586
        if (timeout > 0) {
 
1587
                gig_dbg(DEBUG_USBREQ, "setting timeout of %d/10 secs", timeout);
 
1588
                ucs->timer_ctrl.expires = jiffies + timeout * HZ / 10;
 
1589
                ucs->timer_ctrl.data = (unsigned long) bcs;
 
1590
                ucs->timer_ctrl.function = req_timeout;
 
1591
                add_timer(&ucs->timer_ctrl);
 
1592
        }
 
1593
 
 
1594
        spin_unlock_irqrestore(&ucs->lock, flags);
 
1595
        return 0;
 
1596
}
 
1597
 
 
1598
/* gigaset_init_bchannel
 
1599
 * called by common.c to connect a B channel
 
1600
 * initialize isochronous I/O and tell the Gigaset base to open the channel
 
1601
 * argument:
 
1602
 *      B channel control structure
 
1603
 * return value:
 
1604
 *      0 on success, error code < 0 on error
 
1605
 */
 
1606
static int gigaset_init_bchannel(struct bc_state *bcs)
 
1607
{
 
1608
        struct cardstate *cs = bcs->cs;
 
1609
        int req, ret;
 
1610
        unsigned long flags;
 
1611
 
 
1612
        spin_lock_irqsave(&cs->lock, flags);
 
1613
        if (unlikely(!cs->connected)) {
 
1614
                gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
 
1615
                spin_unlock_irqrestore(&cs->lock, flags);
 
1616
                return -ENODEV;
 
1617
        }
 
1618
 
 
1619
        if (cs->hw.bas->basstate & BS_SUSPEND) {
 
1620
                dev_notice(cs->dev,
 
1621
                           "not starting isochronous I/O, "
 
1622
                           "suspend in progress\n");
 
1623
                spin_unlock_irqrestore(&cs->lock, flags);
 
1624
                return -EHOSTUNREACH;
 
1625
        }
 
1626
 
 
1627
        ret = starturbs(bcs);
 
1628
        if (ret < 0) {
 
1629
                dev_err(cs->dev,
 
1630
                        "could not start isochronous I/O for channel B%d: %s\n",
 
1631
                        bcs->channel + 1,
 
1632
                        ret == -EFAULT ? "null URB" : get_usb_rcmsg(ret));
 
1633
                if (ret != -ENODEV)
 
1634
                        error_hangup(bcs);
 
1635
                spin_unlock_irqrestore(&cs->lock, flags);
 
1636
                return ret;
 
1637
        }
 
1638
 
 
1639
        req = bcs->channel ? HD_OPEN_B2CHANNEL : HD_OPEN_B1CHANNEL;
 
1640
        ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
 
1641
        if (ret < 0) {
 
1642
                dev_err(cs->dev, "could not open channel B%d\n",
 
1643
                        bcs->channel + 1);
 
1644
                stopurbs(bcs->hw.bas);
 
1645
                if (ret != -ENODEV)
 
1646
                        error_hangup(bcs);
 
1647
        }
 
1648
 
 
1649
        spin_unlock_irqrestore(&cs->lock, flags);
 
1650
        return ret;
 
1651
}
 
1652
 
 
1653
/* gigaset_close_bchannel
 
1654
 * called by common.c to disconnect a B channel
 
1655
 * tell the Gigaset base to close the channel
 
1656
 * stopping isochronous I/O and LL notification will be done when the
 
1657
 * acknowledgement for the close arrives
 
1658
 * argument:
 
1659
 *      B channel control structure
 
1660
 * return value:
 
1661
 *      0 on success, error code < 0 on error
 
1662
 */
 
1663
static int gigaset_close_bchannel(struct bc_state *bcs)
 
1664
{
 
1665
        struct cardstate *cs = bcs->cs;
 
1666
        int req, ret;
 
1667
        unsigned long flags;
 
1668
 
 
1669
        spin_lock_irqsave(&cs->lock, flags);
 
1670
        if (unlikely(!cs->connected)) {
 
1671
                spin_unlock_irqrestore(&cs->lock, flags);
 
1672
                gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
 
1673
                return -ENODEV;
 
1674
        }
 
1675
 
 
1676
        if (!(cs->hw.bas->basstate & (bcs->channel ? BS_B2OPEN : BS_B1OPEN))) {
 
1677
                /* channel not running: just signal common.c */
 
1678
                spin_unlock_irqrestore(&cs->lock, flags);
 
1679
                gigaset_bchannel_down(bcs);
 
1680
                return 0;
 
1681
        }
 
1682
 
 
1683
        /* channel running: tell device to close it */
 
1684
        req = bcs->channel ? HD_CLOSE_B2CHANNEL : HD_CLOSE_B1CHANNEL;
 
1685
        ret = req_submit(bcs, req, 0, BAS_TIMEOUT);
 
1686
        if (ret < 0)
 
1687
                dev_err(cs->dev, "closing channel B%d failed\n",
 
1688
                        bcs->channel + 1);
 
1689
 
 
1690
        spin_unlock_irqrestore(&cs->lock, flags);
 
1691
        return ret;
 
1692
}
 
1693
 
 
1694
/* Device Operations */
 
1695
/* ================= */
 
1696
 
 
1697
/* complete_cb
 
1698
 * unqueue first command buffer from queue, waking any sleepers
 
1699
 * must be called with cs->cmdlock held
 
1700
 * parameter:
 
1701
 *      cs      controller state structure
 
1702
 */
 
1703
static void complete_cb(struct cardstate *cs)
 
1704
{
 
1705
        struct cmdbuf_t *cb = cs->cmdbuf;
 
1706
 
 
1707
        /* unqueue completed buffer */
 
1708
        cs->cmdbytes -= cs->curlen;
 
1709
        gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD,
 
1710
                "write_command: sent %u bytes, %u left",
 
1711
                cs->curlen, cs->cmdbytes);
 
1712
        if (cb->next != NULL) {
 
1713
                cs->cmdbuf = cb->next;
 
1714
                cs->cmdbuf->prev = NULL;
 
1715
                cs->curlen = cs->cmdbuf->len;
 
1716
        } else {
 
1717
                cs->cmdbuf = NULL;
 
1718
                cs->lastcmdbuf = NULL;
 
1719
                cs->curlen = 0;
 
1720
        }
 
1721
 
 
1722
        if (cb->wake_tasklet)
 
1723
                tasklet_schedule(cb->wake_tasklet);
 
1724
 
 
1725
        kfree(cb);
 
1726
}
 
1727
 
 
1728
/* write_command_callback
 
1729
 * USB completion handler for AT command transmission
 
1730
 * called by the USB subsystem in interrupt context
 
1731
 * parameter:
 
1732
 *      urb     USB request block of completed request
 
1733
 *              urb->context = controller state structure
 
1734
 */
 
1735
static void write_command_callback(struct urb *urb)
 
1736
{
 
1737
        struct cardstate *cs = urb->context;
 
1738
        struct bas_cardstate *ucs = cs->hw.bas;
 
1739
        int status = urb->status;
 
1740
        unsigned long flags;
 
1741
 
 
1742
        update_basstate(ucs, 0, BS_ATWRPEND);
 
1743
        wake_up(&ucs->waitqueue);
 
1744
 
 
1745
        /* check status */
 
1746
        switch (status) {
 
1747
        case 0:                                 /* normal completion */
 
1748
                break;
 
1749
        case -ENOENT:                   /* cancelled */
 
1750
        case -ECONNRESET:               /* cancelled (async) */
 
1751
        case -EINPROGRESS:              /* pending */
 
1752
        case -ENODEV:                   /* device removed */
 
1753
        case -ESHUTDOWN:                /* device shut down */
 
1754
                /* ignore silently */
 
1755
                gig_dbg(DEBUG_USBREQ, "%s: %s",
 
1756
                        __func__, get_usb_statmsg(status));
 
1757
                return;
 
1758
        default:                                /* any failure */
 
1759
                if (++ucs->retry_cmd_out > BAS_RETRY) {
 
1760
                        dev_warn(cs->dev,
 
1761
                                 "command write: %s, "
 
1762
                                 "giving up after %d retries\n",
 
1763
                                 get_usb_statmsg(status),
 
1764
                                 ucs->retry_cmd_out);
 
1765
                        break;
 
1766
                }
 
1767
                if (ucs->basstate & BS_SUSPEND) {
 
1768
                        dev_warn(cs->dev,
 
1769
                                 "command write: %s, "
 
1770
                                 "won't retry - suspend requested\n",
 
1771
                                 get_usb_statmsg(status));
 
1772
                        break;
 
1773
                }
 
1774
                if (cs->cmdbuf == NULL) {
 
1775
                        dev_warn(cs->dev,
 
1776
                                 "command write: %s, "
 
1777
                                 "cannot retry - cmdbuf gone\n",
 
1778
                                 get_usb_statmsg(status));
 
1779
                        break;
 
1780
                }
 
1781
                dev_notice(cs->dev, "command write: %s, retry %d\n",
 
1782
                           get_usb_statmsg(status), ucs->retry_cmd_out);
 
1783
                if (atwrite_submit(cs, cs->cmdbuf->buf, cs->cmdbuf->len) >= 0)
 
1784
                        /* resubmitted - bypass regular exit block */
 
1785
                        return;
 
1786
                /* command send failed, assume base still waiting */
 
1787
                update_basstate(ucs, BS_ATREADY, 0);
 
1788
        }
 
1789
 
 
1790
        spin_lock_irqsave(&cs->cmdlock, flags);
 
1791
        if (cs->cmdbuf != NULL)
 
1792
                complete_cb(cs);
 
1793
        spin_unlock_irqrestore(&cs->cmdlock, flags);
 
1794
}
 
1795
 
 
1796
/* atrdy_timeout
 
1797
 * timeout routine for AT command transmission
 
1798
 * argument:
 
1799
 *      controller state structure
 
1800
 */
 
1801
static void atrdy_timeout(unsigned long data)
 
1802
{
 
1803
        struct cardstate *cs = (struct cardstate *) data;
 
1804
        struct bas_cardstate *ucs = cs->hw.bas;
 
1805
 
 
1806
        dev_warn(cs->dev, "timeout waiting for HD_READY_SEND_ATDATA\n");
 
1807
 
 
1808
        /* fake the missing signal - what else can I do? */
 
1809
        update_basstate(ucs, BS_ATREADY, BS_ATTIMER);
 
1810
        start_cbsend(cs);
 
1811
}
 
1812
 
 
1813
/* atwrite_submit
 
1814
 * submit an HD_WRITE_ATMESSAGE command URB
 
1815
 * parameters:
 
1816
 *      cs      controller state structure
 
1817
 *      buf     buffer containing command to send
 
1818
 *      len     length of command to send
 
1819
 * return value:
 
1820
 *      0 on success
 
1821
 *      -EBUSY if another request is pending
 
1822
 *      any URB submission error code
 
1823
 */
 
1824
static int atwrite_submit(struct cardstate *cs, unsigned char *buf, int len)
 
1825
{
 
1826
        struct bas_cardstate *ucs = cs->hw.bas;
 
1827
        int rc;
 
1828
 
 
1829
        gig_dbg(DEBUG_USBREQ, "-------> HD_WRITE_ATMESSAGE (%d)", len);
 
1830
 
 
1831
        if (update_basstate(ucs, BS_ATWRPEND, 0) & BS_ATWRPEND) {
 
1832
                dev_err(cs->dev,
 
1833
                        "could not submit HD_WRITE_ATMESSAGE: URB busy\n");
 
1834
                return -EBUSY;
 
1835
        }
 
1836
 
 
1837
        ucs->dr_cmd_out.bRequestType = OUT_VENDOR_REQ;
 
1838
        ucs->dr_cmd_out.bRequest = HD_WRITE_ATMESSAGE;
 
1839
        ucs->dr_cmd_out.wValue = 0;
 
1840
        ucs->dr_cmd_out.wIndex = 0;
 
1841
        ucs->dr_cmd_out.wLength = cpu_to_le16(len);
 
1842
        usb_fill_control_urb(ucs->urb_cmd_out, ucs->udev,
 
1843
                             usb_sndctrlpipe(ucs->udev, 0),
 
1844
                             (unsigned char *) &ucs->dr_cmd_out, buf, len,
 
1845
                             write_command_callback, cs);
 
1846
        rc = usb_submit_urb(ucs->urb_cmd_out, GFP_ATOMIC);
 
1847
        if (unlikely(rc)) {
 
1848
                update_basstate(ucs, 0, BS_ATWRPEND);
 
1849
                dev_err(cs->dev, "could not submit HD_WRITE_ATMESSAGE: %s\n",
 
1850
                        get_usb_rcmsg(rc));
 
1851
                return rc;
 
1852
        }
 
1853
 
 
1854
        /* submitted successfully, start timeout if necessary */
 
1855
        if (!(update_basstate(ucs, BS_ATTIMER, BS_ATREADY) & BS_ATTIMER)) {
 
1856
                gig_dbg(DEBUG_OUTPUT, "setting ATREADY timeout of %d/10 secs",
 
1857
                        ATRDY_TIMEOUT);
 
1858
                ucs->timer_atrdy.expires = jiffies + ATRDY_TIMEOUT * HZ / 10;
 
1859
                ucs->timer_atrdy.data = (unsigned long) cs;
 
1860
                ucs->timer_atrdy.function = atrdy_timeout;
 
1861
                add_timer(&ucs->timer_atrdy);
 
1862
        }
 
1863
        return 0;
 
1864
}
 
1865
 
 
1866
/* start_cbsend
 
1867
 * start transmission of AT command queue if necessary
 
1868
 * parameter:
 
1869
 *      cs              controller state structure
 
1870
 * return value:
 
1871
 *      0 on success
 
1872
 *      error code < 0 on error
 
1873
 */
 
1874
static int start_cbsend(struct cardstate *cs)
 
1875
{
 
1876
        struct cmdbuf_t *cb;
 
1877
        struct bas_cardstate *ucs = cs->hw.bas;
 
1878
        unsigned long flags;
 
1879
        int rc;
 
1880
        int retval = 0;
 
1881
 
 
1882
        /* check if suspend requested */
 
1883
        if (ucs->basstate & BS_SUSPEND) {
 
1884
                gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "suspending");
 
1885
                return -EHOSTUNREACH;
 
1886
        }
 
1887
 
 
1888
        /* check if AT channel is open */
 
1889
        if (!(ucs->basstate & BS_ATOPEN)) {
 
1890
                gig_dbg(DEBUG_TRANSCMD|DEBUG_LOCKCMD, "AT channel not open");
 
1891
                rc = req_submit(cs->bcs, HD_OPEN_ATCHANNEL, 0, BAS_TIMEOUT);
 
1892
                if (rc < 0) {
 
1893
                        /* flush command queue */
 
1894
                        spin_lock_irqsave(&cs->cmdlock, flags);
 
1895
                        while (cs->cmdbuf != NULL)
 
1896
                                complete_cb(cs);
 
1897
                        spin_unlock_irqrestore(&cs->cmdlock, flags);
 
1898
                }
 
1899
                return rc;
 
1900
        }
 
1901
 
 
1902
        /* try to send first command in queue */
 
1903
        spin_lock_irqsave(&cs->cmdlock, flags);
 
1904
 
 
1905
        while ((cb = cs->cmdbuf) != NULL && (ucs->basstate & BS_ATREADY)) {
 
1906
                ucs->retry_cmd_out = 0;
 
1907
                rc = atwrite_submit(cs, cb->buf, cb->len);
 
1908
                if (unlikely(rc)) {
 
1909
                        retval = rc;
 
1910
                        complete_cb(cs);
 
1911
                }
 
1912
        }
 
1913
 
 
1914
        spin_unlock_irqrestore(&cs->cmdlock, flags);
 
1915
        return retval;
 
1916
}
 
1917
 
 
1918
/* gigaset_write_cmd
 
1919
 * This function is called by the device independent part of the driver
 
1920
 * to transmit an AT command string to the Gigaset device.
 
1921
 * It encapsulates the device specific method for transmission over the
 
1922
 * direct USB connection to the base.
 
1923
 * The command string is added to the queue of commands to send, and
 
1924
 * USB transmission is started if necessary.
 
1925
 * parameters:
 
1926
 *      cs              controller state structure
 
1927
 *      buf             command string to send
 
1928
 *      len             number of bytes to send (max. IF_WRITEBUF)
 
1929
 *      wake_tasklet    tasklet to run when transmission is completed
 
1930
 *                      (NULL if none)
 
1931
 * return value:
 
1932
 *      number of bytes queued on success
 
1933
 *      error code < 0 on error
 
1934
 */
 
1935
static int gigaset_write_cmd(struct cardstate *cs,
 
1936
                             const unsigned char *buf, int len,
 
1937
                             struct tasklet_struct *wake_tasklet)
 
1938
{
 
1939
        struct cmdbuf_t *cb;
 
1940
        unsigned long flags;
 
1941
        int rc;
 
1942
 
 
1943
        gigaset_dbg_buffer(cs->mstate != MS_LOCKED ?
 
1944
                             DEBUG_TRANSCMD : DEBUG_LOCKCMD,
 
1945
                           "CMD Transmit", len, buf);
 
1946
 
 
1947
        if (len <= 0) {
 
1948
                /* nothing to do */
 
1949
                rc = 0;
 
1950
                goto notqueued;
 
1951
        }
 
1952
 
 
1953
        /* translate "+++" escape sequence sent as a single separate command
 
1954
         * into "close AT channel" command for error recovery
 
1955
         * The next command will reopen the AT channel automatically.
 
1956
         */
 
1957
        if (len == 3 && !memcmp(buf, "+++", 3)) {
 
1958
                rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, BAS_TIMEOUT);
 
1959
                goto notqueued;
 
1960
        }
 
1961
 
 
1962
        if (len > IF_WRITEBUF)
 
1963
                len = IF_WRITEBUF;
 
1964
        cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC);
 
1965
        if (!cb) {
 
1966
                dev_err(cs->dev, "%s: out of memory\n", __func__);
 
1967
                rc = -ENOMEM;
 
1968
                goto notqueued;
 
1969
        }
 
1970
 
 
1971
        memcpy(cb->buf, buf, len);
 
1972
        cb->len = len;
 
1973
        cb->offset = 0;
 
1974
        cb->next = NULL;
 
1975
        cb->wake_tasklet = wake_tasklet;
 
1976
 
 
1977
        spin_lock_irqsave(&cs->cmdlock, flags);
 
1978
        cb->prev = cs->lastcmdbuf;
 
1979
        if (cs->lastcmdbuf)
 
1980
                cs->lastcmdbuf->next = cb;
 
1981
        else {
 
1982
                cs->cmdbuf = cb;
 
1983
                cs->curlen = len;
 
1984
        }
 
1985
        cs->cmdbytes += len;
 
1986
        cs->lastcmdbuf = cb;
 
1987
        spin_unlock_irqrestore(&cs->cmdlock, flags);
 
1988
 
 
1989
        spin_lock_irqsave(&cs->lock, flags);
 
1990
        if (unlikely(!cs->connected)) {
 
1991
                spin_unlock_irqrestore(&cs->lock, flags);
 
1992
                gig_dbg(DEBUG_USBREQ, "%s: not connected", __func__);
 
1993
                /* flush command queue */
 
1994
                spin_lock_irqsave(&cs->cmdlock, flags);
 
1995
                while (cs->cmdbuf != NULL)
 
1996
                        complete_cb(cs);
 
1997
                spin_unlock_irqrestore(&cs->cmdlock, flags);
 
1998
                return -ENODEV;
 
1999
        }
 
2000
        rc = start_cbsend(cs);
 
2001
        spin_unlock_irqrestore(&cs->lock, flags);
 
2002
        return rc < 0 ? rc : len;
 
2003
 
 
2004
notqueued:                      /* request handled without queuing */
 
2005
        if (wake_tasklet)
 
2006
                tasklet_schedule(wake_tasklet);
 
2007
        return rc;
 
2008
}
 
2009
 
 
2010
/* gigaset_write_room
 
2011
 * tty_driver.write_room interface routine
 
2012
 * return number of characters the driver will accept to be written via
 
2013
 * gigaset_write_cmd
 
2014
 * parameter:
 
2015
 *      controller state structure
 
2016
 * return value:
 
2017
 *      number of characters
 
2018
 */
 
2019
static int gigaset_write_room(struct cardstate *cs)
 
2020
{
 
2021
        return IF_WRITEBUF;
 
2022
}
 
2023
 
 
2024
/* gigaset_chars_in_buffer
 
2025
 * tty_driver.chars_in_buffer interface routine
 
2026
 * return number of characters waiting to be sent
 
2027
 * parameter:
 
2028
 *      controller state structure
 
2029
 * return value:
 
2030
 *      number of characters
 
2031
 */
 
2032
static int gigaset_chars_in_buffer(struct cardstate *cs)
 
2033
{
 
2034
        return cs->cmdbytes;
 
2035
}
 
2036
 
 
2037
/* gigaset_brkchars
 
2038
 * implementation of ioctl(GIGASET_BRKCHARS)
 
2039
 * parameter:
 
2040
 *      controller state structure
 
2041
 * return value:
 
2042
 *      -EINVAL (unimplemented function)
 
2043
 */
 
2044
static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6])
 
2045
{
 
2046
        return -EINVAL;
 
2047
}
 
2048
 
 
2049
 
 
2050
/* Device Initialization/Shutdown */
 
2051
/* ============================== */
 
2052
 
 
2053
/* Free hardware dependent part of the B channel structure
 
2054
 * parameter:
 
2055
 *      bcs     B channel structure
 
2056
 * return value:
 
2057
 *      !=0 on success
 
2058
 */
 
2059
static int gigaset_freebcshw(struct bc_state *bcs)
 
2060
{
 
2061
        struct bas_bc_state *ubc = bcs->hw.bas;
 
2062
        int i;
 
2063
 
 
2064
        if (!ubc)
 
2065
                return 0;
 
2066
 
 
2067
        /* kill URBs and tasklets before freeing - better safe than sorry */
 
2068
        ubc->running = 0;
 
2069
        gig_dbg(DEBUG_INIT, "%s: killing iso URBs", __func__);
 
2070
        for (i = 0; i < BAS_OUTURBS; ++i) {
 
2071
                usb_kill_urb(ubc->isoouturbs[i].urb);
 
2072
                usb_free_urb(ubc->isoouturbs[i].urb);
 
2073
        }
 
2074
        for (i = 0; i < BAS_INURBS; ++i) {
 
2075
                usb_kill_urb(ubc->isoinurbs[i]);
 
2076
                usb_free_urb(ubc->isoinurbs[i]);
 
2077
        }
 
2078
        tasklet_kill(&ubc->sent_tasklet);
 
2079
        tasklet_kill(&ubc->rcvd_tasklet);
 
2080
        kfree(ubc->isooutbuf);
 
2081
        kfree(ubc);
 
2082
        bcs->hw.bas = NULL;
 
2083
        return 1;
 
2084
}
 
2085
 
 
2086
/* Initialize hardware dependent part of the B channel structure
 
2087
 * parameter:
 
2088
 *      bcs     B channel structure
 
2089
 * return value:
 
2090
 *      !=0 on success
 
2091
 */
 
2092
static int gigaset_initbcshw(struct bc_state *bcs)
 
2093
{
 
2094
        int i;
 
2095
        struct bas_bc_state *ubc;
 
2096
 
 
2097
        bcs->hw.bas = ubc = kmalloc(sizeof(struct bas_bc_state), GFP_KERNEL);
 
2098
        if (!ubc) {
 
2099
                pr_err("out of memory\n");
 
2100
                return 0;
 
2101
        }
 
2102
 
 
2103
        ubc->running = 0;
 
2104
        atomic_set(&ubc->corrbytes, 0);
 
2105
        spin_lock_init(&ubc->isooutlock);
 
2106
        for (i = 0; i < BAS_OUTURBS; ++i) {
 
2107
                ubc->isoouturbs[i].urb = NULL;
 
2108
                ubc->isoouturbs[i].bcs = bcs;
 
2109
        }
 
2110
        ubc->isooutdone = ubc->isooutfree = ubc->isooutovfl = NULL;
 
2111
        ubc->numsub = 0;
 
2112
        ubc->isooutbuf = kmalloc(sizeof(struct isowbuf_t), GFP_KERNEL);
 
2113
        if (!ubc->isooutbuf) {
 
2114
                pr_err("out of memory\n");
 
2115
                kfree(ubc);
 
2116
                bcs->hw.bas = NULL;
 
2117
                return 0;
 
2118
        }
 
2119
        tasklet_init(&ubc->sent_tasklet,
 
2120
                     write_iso_tasklet, (unsigned long) bcs);
 
2121
 
 
2122
        spin_lock_init(&ubc->isoinlock);
 
2123
        for (i = 0; i < BAS_INURBS; ++i)
 
2124
                ubc->isoinurbs[i] = NULL;
 
2125
        ubc->isoindone = NULL;
 
2126
        ubc->loststatus = -EINPROGRESS;
 
2127
        ubc->isoinlost = 0;
 
2128
        ubc->seqlen = 0;
 
2129
        ubc->inbyte = 0;
 
2130
        ubc->inbits = 0;
 
2131
        ubc->goodbytes = 0;
 
2132
        ubc->alignerrs = 0;
 
2133
        ubc->fcserrs = 0;
 
2134
        ubc->frameerrs = 0;
 
2135
        ubc->giants = 0;
 
2136
        ubc->runts = 0;
 
2137
        ubc->aborts = 0;
 
2138
        ubc->shared0s = 0;
 
2139
        ubc->stolen0s = 0;
 
2140
        tasklet_init(&ubc->rcvd_tasklet,
 
2141
                     read_iso_tasklet, (unsigned long) bcs);
 
2142
        return 1;
 
2143
}
 
2144
 
 
2145
static void gigaset_reinitbcshw(struct bc_state *bcs)
 
2146
{
 
2147
        struct bas_bc_state *ubc = bcs->hw.bas;
 
2148
 
 
2149
        bcs->hw.bas->running = 0;
 
2150
        atomic_set(&bcs->hw.bas->corrbytes, 0);
 
2151
        bcs->hw.bas->numsub = 0;
 
2152
        spin_lock_init(&ubc->isooutlock);
 
2153
        spin_lock_init(&ubc->isoinlock);
 
2154
        ubc->loststatus = -EINPROGRESS;
 
2155
}
 
2156
 
 
2157
static void gigaset_freecshw(struct cardstate *cs)
 
2158
{
 
2159
        /* timers, URBs and rcvbuf are disposed of in disconnect */
 
2160
        kfree(cs->hw.bas->int_in_buf);
 
2161
        kfree(cs->hw.bas);
 
2162
        cs->hw.bas = NULL;
 
2163
}
 
2164
 
 
2165
static int gigaset_initcshw(struct cardstate *cs)
 
2166
{
 
2167
        struct bas_cardstate *ucs;
 
2168
 
 
2169
        cs->hw.bas = ucs = kmalloc(sizeof *ucs, GFP_KERNEL);
 
2170
        if (!ucs) {
 
2171
                pr_err("out of memory\n");
 
2172
                return 0;
 
2173
        }
 
2174
        ucs->int_in_buf = kmalloc(IP_MSGSIZE, GFP_KERNEL);
 
2175
        if (!ucs->int_in_buf) {
 
2176
                kfree(ucs);
 
2177
                pr_err("out of memory\n");
 
2178
                return 0;
 
2179
        }
 
2180
 
 
2181
        ucs->urb_cmd_in = NULL;
 
2182
        ucs->urb_cmd_out = NULL;
 
2183
        ucs->rcvbuf = NULL;
 
2184
        ucs->rcvbuf_size = 0;
 
2185
 
 
2186
        spin_lock_init(&ucs->lock);
 
2187
        ucs->pending = 0;
 
2188
 
 
2189
        ucs->basstate = 0;
 
2190
        init_timer(&ucs->timer_ctrl);
 
2191
        init_timer(&ucs->timer_atrdy);
 
2192
        init_timer(&ucs->timer_cmd_in);
 
2193
        init_waitqueue_head(&ucs->waitqueue);
 
2194
 
 
2195
        return 1;
 
2196
}
 
2197
 
 
2198
/* freeurbs
 
2199
 * unlink and deallocate all URBs unconditionally
 
2200
 * caller must make sure that no commands are still in progress
 
2201
 * parameter:
 
2202
 *      cs      controller state structure
 
2203
 */
 
2204
static void freeurbs(struct cardstate *cs)
 
2205
{
 
2206
        struct bas_cardstate *ucs = cs->hw.bas;
 
2207
        struct bas_bc_state *ubc;
 
2208
        int i, j;
 
2209
 
 
2210
        gig_dbg(DEBUG_INIT, "%s: killing URBs", __func__);
 
2211
        for (j = 0; j < BAS_CHANNELS; ++j) {
 
2212
                ubc = cs->bcs[j].hw.bas;
 
2213
                for (i = 0; i < BAS_OUTURBS; ++i) {
 
2214
                        usb_kill_urb(ubc->isoouturbs[i].urb);
 
2215
                        usb_free_urb(ubc->isoouturbs[i].urb);
 
2216
                        ubc->isoouturbs[i].urb = NULL;
 
2217
                }
 
2218
                for (i = 0; i < BAS_INURBS; ++i) {
 
2219
                        usb_kill_urb(ubc->isoinurbs[i]);
 
2220
                        usb_free_urb(ubc->isoinurbs[i]);
 
2221
                        ubc->isoinurbs[i] = NULL;
 
2222
                }
 
2223
        }
 
2224
        usb_kill_urb(ucs->urb_int_in);
 
2225
        usb_free_urb(ucs->urb_int_in);
 
2226
        ucs->urb_int_in = NULL;
 
2227
        usb_kill_urb(ucs->urb_cmd_out);
 
2228
        usb_free_urb(ucs->urb_cmd_out);
 
2229
        ucs->urb_cmd_out = NULL;
 
2230
        usb_kill_urb(ucs->urb_cmd_in);
 
2231
        usb_free_urb(ucs->urb_cmd_in);
 
2232
        ucs->urb_cmd_in = NULL;
 
2233
        usb_kill_urb(ucs->urb_ctrl);
 
2234
        usb_free_urb(ucs->urb_ctrl);
 
2235
        ucs->urb_ctrl = NULL;
 
2236
}
 
2237
 
 
2238
/* gigaset_probe
 
2239
 * This function is called when a new USB device is connected.
 
2240
 * It checks whether the new device is handled by this driver.
 
2241
 */
 
2242
static int gigaset_probe(struct usb_interface *interface,
 
2243
                         const struct usb_device_id *id)
 
2244
{
 
2245
        struct usb_host_interface *hostif;
 
2246
        struct usb_device *udev = interface_to_usbdev(interface);
 
2247
        struct cardstate *cs = NULL;
 
2248
        struct bas_cardstate *ucs = NULL;
 
2249
        struct bas_bc_state *ubc;
 
2250
        struct usb_endpoint_descriptor *endpoint;
 
2251
        int i, j;
 
2252
        int rc;
 
2253
 
 
2254
        gig_dbg(DEBUG_ANY,
 
2255
                "%s: Check if device matches .. (Vendor: 0x%x, Product: 0x%x)",
 
2256
                __func__, le16_to_cpu(udev->descriptor.idVendor),
 
2257
                le16_to_cpu(udev->descriptor.idProduct));
 
2258
 
 
2259
        /* set required alternate setting */
 
2260
        hostif = interface->cur_altsetting;
 
2261
        if (hostif->desc.bAlternateSetting != 3) {
 
2262
                gig_dbg(DEBUG_ANY,
 
2263
                        "%s: wrong alternate setting %d - trying to switch",
 
2264
                        __func__, hostif->desc.bAlternateSetting);
 
2265
                if (usb_set_interface(udev, hostif->desc.bInterfaceNumber, 3)
 
2266
                    < 0) {
 
2267
                        dev_warn(&udev->dev, "usb_set_interface failed, "
 
2268
                                 "device %d interface %d altsetting %d\n",
 
2269
                                 udev->devnum, hostif->desc.bInterfaceNumber,
 
2270
                                 hostif->desc.bAlternateSetting);
 
2271
                        return -ENODEV;
 
2272
                }
 
2273
                hostif = interface->cur_altsetting;
 
2274
        }
 
2275
 
 
2276
        /* Reject application specific interfaces
 
2277
         */
 
2278
        if (hostif->desc.bInterfaceClass != 255) {
 
2279
                dev_warn(&udev->dev, "%s: bInterfaceClass == %d\n",
 
2280
                         __func__, hostif->desc.bInterfaceClass);
 
2281
                return -ENODEV;
 
2282
        }
 
2283
 
 
2284
        dev_info(&udev->dev,
 
2285
                 "%s: Device matched (Vendor: 0x%x, Product: 0x%x)\n",
 
2286
                 __func__, le16_to_cpu(udev->descriptor.idVendor),
 
2287
                 le16_to_cpu(udev->descriptor.idProduct));
 
2288
 
 
2289
        /* allocate memory for our device state and intialize it */
 
2290
        cs = gigaset_initcs(driver, BAS_CHANNELS, 0, 0, cidmode,
 
2291
                            GIGASET_MODULENAME);
 
2292
        if (!cs)
 
2293
                return -ENODEV;
 
2294
        ucs = cs->hw.bas;
 
2295
 
 
2296
        /* save off device structure ptrs for later use */
 
2297
        usb_get_dev(udev);
 
2298
        ucs->udev = udev;
 
2299
        ucs->interface = interface;
 
2300
        cs->dev = &interface->dev;
 
2301
 
 
2302
        /* allocate URBs:
 
2303
         * - one for the interrupt pipe
 
2304
         * - three for the different uses of the default control pipe
 
2305
         * - three for each isochronous pipe
 
2306
         */
 
2307
        if (!(ucs->urb_int_in = usb_alloc_urb(0, GFP_KERNEL)) ||
 
2308
            !(ucs->urb_cmd_in = usb_alloc_urb(0, GFP_KERNEL)) ||
 
2309
            !(ucs->urb_cmd_out = usb_alloc_urb(0, GFP_KERNEL)) ||
 
2310
            !(ucs->urb_ctrl = usb_alloc_urb(0, GFP_KERNEL)))
 
2311
                goto allocerr;
 
2312
 
 
2313
        for (j = 0; j < BAS_CHANNELS; ++j) {
 
2314
                ubc = cs->bcs[j].hw.bas;
 
2315
                for (i = 0; i < BAS_OUTURBS; ++i)
 
2316
                        if (!(ubc->isoouturbs[i].urb =
 
2317
                              usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
 
2318
                                goto allocerr;
 
2319
                for (i = 0; i < BAS_INURBS; ++i)
 
2320
                        if (!(ubc->isoinurbs[i] =
 
2321
                              usb_alloc_urb(BAS_NUMFRAMES, GFP_KERNEL)))
 
2322
                                goto allocerr;
 
2323
        }
 
2324
 
 
2325
        ucs->rcvbuf = NULL;
 
2326
        ucs->rcvbuf_size = 0;
 
2327
 
 
2328
        /* Fill the interrupt urb and send it to the core */
 
2329
        endpoint = &hostif->endpoint[0].desc;
 
2330
        usb_fill_int_urb(ucs->urb_int_in, udev,
 
2331
                         usb_rcvintpipe(udev,
 
2332
                                        (endpoint->bEndpointAddress) & 0x0f),
 
2333
                         ucs->int_in_buf, IP_MSGSIZE, read_int_callback, cs,
 
2334
                         endpoint->bInterval);
 
2335
        rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
 
2336
        if (rc != 0) {
 
2337
                dev_err(cs->dev, "could not submit interrupt URB: %s\n",
 
2338
                        get_usb_rcmsg(rc));
 
2339
                goto error;
 
2340
        }
 
2341
 
 
2342
        /* tell the device that the driver is ready */
 
2343
        rc = req_submit(cs->bcs, HD_DEVICE_INIT_ACK, 0, 0);
 
2344
        if (rc != 0)
 
2345
                goto error;
 
2346
 
 
2347
        /* tell common part that the device is ready */
 
2348
        if (startmode == SM_LOCKED)
 
2349
                cs->mstate = MS_LOCKED;
 
2350
 
 
2351
        /* save address of controller structure */
 
2352
        usb_set_intfdata(interface, cs);
 
2353
 
 
2354
        if (!gigaset_start(cs))
 
2355
                goto error;
 
2356
 
 
2357
        return 0;
 
2358
 
 
2359
allocerr:
 
2360
        dev_err(cs->dev, "could not allocate URBs\n");
 
2361
error:
 
2362
        freeurbs(cs);
 
2363
        usb_set_intfdata(interface, NULL);
 
2364
        gigaset_freecs(cs);
 
2365
        return -ENODEV;
 
2366
}
 
2367
 
 
2368
/* gigaset_disconnect
 
2369
 * This function is called when the Gigaset base is unplugged.
 
2370
 */
 
2371
static void gigaset_disconnect(struct usb_interface *interface)
 
2372
{
 
2373
        struct cardstate *cs;
 
2374
        struct bas_cardstate *ucs;
 
2375
        int j;
 
2376
 
 
2377
        cs = usb_get_intfdata(interface);
 
2378
 
 
2379
        ucs = cs->hw.bas;
 
2380
 
 
2381
        dev_info(cs->dev, "disconnecting Gigaset base\n");
 
2382
 
 
2383
        /* mark base as not ready, all channels disconnected */
 
2384
        ucs->basstate = 0;
 
2385
 
 
2386
        /* tell LL all channels are down */
 
2387
        for (j = 0; j < BAS_CHANNELS; ++j)
 
2388
                gigaset_bchannel_down(cs->bcs + j);
 
2389
 
 
2390
        /* stop driver (common part) */
 
2391
        gigaset_stop(cs);
 
2392
 
 
2393
        /* stop timers and URBs, free ressources */
 
2394
        del_timer_sync(&ucs->timer_ctrl);
 
2395
        del_timer_sync(&ucs->timer_atrdy);
 
2396
        del_timer_sync(&ucs->timer_cmd_in);
 
2397
        freeurbs(cs);
 
2398
        usb_set_intfdata(interface, NULL);
 
2399
        kfree(ucs->rcvbuf);
 
2400
        ucs->rcvbuf = NULL;
 
2401
        ucs->rcvbuf_size = 0;
 
2402
        usb_put_dev(ucs->udev);
 
2403
        ucs->interface = NULL;
 
2404
        ucs->udev = NULL;
 
2405
        cs->dev = NULL;
 
2406
        gigaset_freecs(cs);
 
2407
}
 
2408
 
 
2409
/* gigaset_suspend
 
2410
 * This function is called before the USB connection is suspended.
 
2411
 */
 
2412
static int gigaset_suspend(struct usb_interface *intf, pm_message_t message)
 
2413
{
 
2414
        struct cardstate *cs = usb_get_intfdata(intf);
 
2415
        struct bas_cardstate *ucs = cs->hw.bas;
 
2416
        int rc;
 
2417
 
 
2418
        /* set suspend flag; this stops AT command/response traffic */
 
2419
        if (update_basstate(ucs, BS_SUSPEND, 0) & BS_SUSPEND) {
 
2420
                gig_dbg(DEBUG_SUSPEND, "already suspended");
 
2421
                return 0;
 
2422
        }
 
2423
 
 
2424
        /* wait a bit for blocking conditions to go away */
 
2425
        rc = wait_event_timeout(ucs->waitqueue,
 
2426
                        !(ucs->basstate &
 
2427
                          (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)),
 
2428
                        BAS_TIMEOUT*HZ/10);
 
2429
        gig_dbg(DEBUG_SUSPEND, "wait_event_timeout() -> %d", rc);
 
2430
 
 
2431
        /* check for conditions preventing suspend */
 
2432
        if (ucs->basstate & (BS_B1OPEN|BS_B2OPEN|BS_ATRDPEND|BS_ATWRPEND)) {
 
2433
                dev_warn(cs->dev, "cannot suspend:\n");
 
2434
                if (ucs->basstate & BS_B1OPEN)
 
2435
                        dev_warn(cs->dev, " B channel 1 open\n");
 
2436
                if (ucs->basstate & BS_B2OPEN)
 
2437
                        dev_warn(cs->dev, " B channel 2 open\n");
 
2438
                if (ucs->basstate & BS_ATRDPEND)
 
2439
                        dev_warn(cs->dev, " receiving AT reply\n");
 
2440
                if (ucs->basstate & BS_ATWRPEND)
 
2441
                        dev_warn(cs->dev, " sending AT command\n");
 
2442
                update_basstate(ucs, 0, BS_SUSPEND);
 
2443
                return -EBUSY;
 
2444
        }
 
2445
 
 
2446
        /* close AT channel if open */
 
2447
        if (ucs->basstate & BS_ATOPEN) {
 
2448
                gig_dbg(DEBUG_SUSPEND, "closing AT channel");
 
2449
                rc = req_submit(cs->bcs, HD_CLOSE_ATCHANNEL, 0, 0);
 
2450
                if (rc) {
 
2451
                        update_basstate(ucs, 0, BS_SUSPEND);
 
2452
                        return rc;
 
2453
                }
 
2454
                wait_event_timeout(ucs->waitqueue, !ucs->pending,
 
2455
                                   BAS_TIMEOUT*HZ/10);
 
2456
                /* in case of timeout, proceed anyway */
 
2457
        }
 
2458
 
 
2459
        /* kill all URBs and timers that might still be pending */
 
2460
        usb_kill_urb(ucs->urb_ctrl);
 
2461
        usb_kill_urb(ucs->urb_int_in);
 
2462
        del_timer_sync(&ucs->timer_ctrl);
 
2463
 
 
2464
        gig_dbg(DEBUG_SUSPEND, "suspend complete");
 
2465
        return 0;
 
2466
}
 
2467
 
 
2468
/* gigaset_resume
 
2469
 * This function is called after the USB connection has been resumed.
 
2470
 */
 
2471
static int gigaset_resume(struct usb_interface *intf)
 
2472
{
 
2473
        struct cardstate *cs = usb_get_intfdata(intf);
 
2474
        struct bas_cardstate *ucs = cs->hw.bas;
 
2475
        int rc;
 
2476
 
 
2477
        /* resubmit interrupt URB for spontaneous messages from base */
 
2478
        rc = usb_submit_urb(ucs->urb_int_in, GFP_KERNEL);
 
2479
        if (rc) {
 
2480
                dev_err(cs->dev, "could not resubmit interrupt URB: %s\n",
 
2481
                        get_usb_rcmsg(rc));
 
2482
                return rc;
 
2483
        }
 
2484
 
 
2485
        /* clear suspend flag to reallow activity */
 
2486
        update_basstate(ucs, 0, BS_SUSPEND);
 
2487
 
 
2488
        gig_dbg(DEBUG_SUSPEND, "resume complete");
 
2489
        return 0;
 
2490
}
 
2491
 
 
2492
/* gigaset_pre_reset
 
2493
 * This function is called before the USB connection is reset.
 
2494
 */
 
2495
static int gigaset_pre_reset(struct usb_interface *intf)
 
2496
{
 
2497
        /* handle just like suspend */
 
2498
        return gigaset_suspend(intf, PMSG_ON);
 
2499
}
 
2500
 
 
2501
/* gigaset_post_reset
 
2502
 * This function is called after the USB connection has been reset.
 
2503
 */
 
2504
static int gigaset_post_reset(struct usb_interface *intf)
 
2505
{
 
2506
        /* FIXME: send HD_DEVICE_INIT_ACK? */
 
2507
 
 
2508
        /* resume operations */
 
2509
        return gigaset_resume(intf);
 
2510
}
 
2511
 
 
2512
 
 
2513
static const struct gigaset_ops gigops = {
 
2514
        gigaset_write_cmd,
 
2515
        gigaset_write_room,
 
2516
        gigaset_chars_in_buffer,
 
2517
        gigaset_brkchars,
 
2518
        gigaset_init_bchannel,
 
2519
        gigaset_close_bchannel,
 
2520
        gigaset_initbcshw,
 
2521
        gigaset_freebcshw,
 
2522
        gigaset_reinitbcshw,
 
2523
        gigaset_initcshw,
 
2524
        gigaset_freecshw,
 
2525
        gigaset_set_modem_ctrl,
 
2526
        gigaset_baud_rate,
 
2527
        gigaset_set_line_ctrl,
 
2528
        gigaset_isoc_send_skb,
 
2529
        gigaset_isoc_input,
 
2530
};
 
2531
 
 
2532
/* bas_gigaset_init
 
2533
 * This function is called after the kernel module is loaded.
 
2534
 */
 
2535
static int __init bas_gigaset_init(void)
 
2536
{
 
2537
        int result;
 
2538
 
 
2539
        /* allocate memory for our driver state and intialize it */
 
2540
        driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS,
 
2541
                                    GIGASET_MODULENAME, GIGASET_DEVNAME,
 
2542
                                    &gigops, THIS_MODULE);
 
2543
        if (driver == NULL)
 
2544
                goto error;
 
2545
 
 
2546
        /* register this driver with the USB subsystem */
 
2547
        result = usb_register(&gigaset_usb_driver);
 
2548
        if (result < 0) {
 
2549
                pr_err("error %d registering USB driver\n", -result);
 
2550
                goto error;
 
2551
        }
 
2552
 
 
2553
        pr_info(DRIVER_DESC "\n");
 
2554
        return 0;
 
2555
 
 
2556
error:
 
2557
        if (driver)
 
2558
                gigaset_freedriver(driver);
 
2559
        driver = NULL;
 
2560
        return -1;
 
2561
}
 
2562
 
 
2563
/* bas_gigaset_exit
 
2564
 * This function is called before the kernel module is unloaded.
 
2565
 */
 
2566
static void __exit bas_gigaset_exit(void)
 
2567
{
 
2568
        struct bas_cardstate *ucs;
 
2569
        int i;
 
2570
 
 
2571
        gigaset_blockdriver(driver); /* => probe will fail
 
2572
                                      * => no gigaset_start any more
 
2573
                                      */
 
2574
 
 
2575
        /* stop all connected devices */
 
2576
        for (i = 0; i < driver->minors; i++) {
 
2577
                if (gigaset_shutdown(driver->cs + i) < 0)
 
2578
                        continue;               /* no device */
 
2579
                /* from now on, no isdn callback should be possible */
 
2580
 
 
2581
                /* close all still open channels */
 
2582
                ucs = driver->cs[i].hw.bas;
 
2583
                if (ucs->basstate & BS_B1OPEN) {
 
2584
                        gig_dbg(DEBUG_INIT, "closing B1 channel");
 
2585
                        usb_control_msg(ucs->udev,
 
2586
                                        usb_sndctrlpipe(ucs->udev, 0),
 
2587
                                        HD_CLOSE_B1CHANNEL, OUT_VENDOR_REQ,
 
2588
                                        0, 0, NULL, 0, BAS_TIMEOUT);
 
2589
                }
 
2590
                if (ucs->basstate & BS_B2OPEN) {
 
2591
                        gig_dbg(DEBUG_INIT, "closing B2 channel");
 
2592
                        usb_control_msg(ucs->udev,
 
2593
                                        usb_sndctrlpipe(ucs->udev, 0),
 
2594
                                        HD_CLOSE_B2CHANNEL, OUT_VENDOR_REQ,
 
2595
                                        0, 0, NULL, 0, BAS_TIMEOUT);
 
2596
                }
 
2597
                if (ucs->basstate & BS_ATOPEN) {
 
2598
                        gig_dbg(DEBUG_INIT, "closing AT channel");
 
2599
                        usb_control_msg(ucs->udev,
 
2600
                                        usb_sndctrlpipe(ucs->udev, 0),
 
2601
                                        HD_CLOSE_ATCHANNEL, OUT_VENDOR_REQ,
 
2602
                                        0, 0, NULL, 0, BAS_TIMEOUT);
 
2603
                }
 
2604
                ucs->basstate = 0;
 
2605
        }
 
2606
 
 
2607
        /* deregister this driver with the USB subsystem */
 
2608
        usb_deregister(&gigaset_usb_driver);
 
2609
        /* this will call the disconnect-callback */
 
2610
        /* from now on, no disconnect/probe callback should be running */
 
2611
 
 
2612
        gigaset_freedriver(driver);
 
2613
        driver = NULL;
 
2614
}
 
2615
 
 
2616
 
 
2617
module_init(bas_gigaset_init);
 
2618
module_exit(bas_gigaset_exit);
 
2619
 
 
2620
MODULE_AUTHOR(DRIVER_AUTHOR);
 
2621
MODULE_DESCRIPTION(DRIVER_DESC);
 
2622
MODULE_LICENSE("GPL");