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2869b23e TS |
1 | /* This is the serial hardware link layer (HLL) for the Gigaset 307x isdn |
2 | * DECT base (aka Sinus 45 isdn) using the RS232 DECT data module M101, | |
3 | * written as a line discipline. | |
4 | * | |
5 | * ===================================================================== | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License as | |
8 | * published by the Free Software Foundation; either version 2 of | |
9 | * the License, or (at your option) any later version. | |
10 | * ===================================================================== | |
11 | */ | |
12 | ||
13 | #include "gigaset.h" | |
14 | ||
15 | #include <linux/module.h> | |
16 | #include <linux/moduleparam.h> | |
17 | #include <linux/platform_device.h> | |
18 | #include <linux/tty.h> | |
19 | #include <linux/poll.h> | |
20 | ||
21 | /* Version Information */ | |
22 | #define DRIVER_AUTHOR "Tilman Schmidt" | |
23 | #define DRIVER_DESC "Serial Driver for Gigaset 307x using Siemens M101" | |
24 | ||
25 | #define GIGASET_MINORS 1 | |
26 | #define GIGASET_MINOR 0 | |
27 | #define GIGASET_MODULENAME "ser_gigaset" | |
28 | #define GIGASET_DEVNAME "ttyGS" | |
29 | ||
30 | /* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */ | |
31 | #define IF_WRITEBUF 264 | |
32 | ||
33 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
34 | MODULE_DESCRIPTION(DRIVER_DESC); | |
35 | MODULE_LICENSE("GPL"); | |
36 | MODULE_ALIAS_LDISC(N_GIGASET_M101); | |
37 | ||
38 | static int startmode = SM_ISDN; | |
39 | module_param(startmode, int, S_IRUGO); | |
40 | MODULE_PARM_DESC(startmode, "initial operation mode"); | |
41 | static int cidmode = 1; | |
42 | module_param(cidmode, int, S_IRUGO); | |
43 | MODULE_PARM_DESC(cidmode, "stay in CID mode when idle"); | |
44 | ||
45 | static struct gigaset_driver *driver; | |
46 | ||
47 | struct ser_cardstate { | |
48 | struct platform_device dev; | |
49 | struct tty_struct *tty; | |
50 | atomic_t refcnt; | |
51 | struct mutex dead_mutex; | |
52 | }; | |
53 | ||
54 | static struct platform_driver device_driver = { | |
55 | .driver = { | |
56 | .name = GIGASET_MODULENAME, | |
57 | }, | |
58 | }; | |
59 | ||
60 | static void flush_send_queue(struct cardstate *); | |
61 | ||
62 | /* transmit data from current open skb | |
63 | * result: number of bytes sent or error code < 0 | |
64 | */ | |
65 | static int write_modem(struct cardstate *cs) | |
66 | { | |
67 | struct tty_struct *tty = cs->hw.ser->tty; | |
68 | struct bc_state *bcs = &cs->bcs[0]; /* only one channel */ | |
69 | struct sk_buff *skb = bcs->tx_skb; | |
70 | int sent; | |
71 | ||
72 | if (!tty || !tty->driver || !skb) | |
73 | return -EFAULT; | |
74 | ||
75 | if (!skb->len) { | |
76 | dev_kfree_skb_any(skb); | |
77 | bcs->tx_skb = NULL; | |
78 | return -EINVAL; | |
79 | } | |
80 | ||
81 | set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
82 | sent = tty->driver->write(tty, skb->data, skb->len); | |
83 | gig_dbg(DEBUG_OUTPUT, "write_modem: sent %d", sent); | |
84 | if (sent < 0) { | |
85 | /* error */ | |
86 | flush_send_queue(cs); | |
87 | return sent; | |
88 | } | |
89 | skb_pull(skb, sent); | |
90 | if (!skb->len) { | |
91 | /* skb sent completely */ | |
92 | gigaset_skb_sent(bcs, skb); | |
93 | ||
94 | gig_dbg(DEBUG_INTR, "kfree skb (Adr: %lx)!", | |
95 | (unsigned long) skb); | |
96 | dev_kfree_skb_any(skb); | |
97 | bcs->tx_skb = NULL; | |
98 | } | |
99 | return sent; | |
100 | } | |
101 | ||
102 | /* | |
103 | * transmit first queued command buffer | |
104 | * result: number of bytes sent or error code < 0 | |
105 | */ | |
106 | static int send_cb(struct cardstate *cs) | |
107 | { | |
108 | struct tty_struct *tty = cs->hw.ser->tty; | |
109 | struct cmdbuf_t *cb, *tcb; | |
110 | unsigned long flags; | |
111 | int sent = 0; | |
112 | ||
113 | if (!tty || !tty->driver) | |
114 | return -EFAULT; | |
115 | ||
116 | cb = cs->cmdbuf; | |
117 | if (!cb) | |
118 | return 0; /* nothing to do */ | |
119 | ||
120 | if (cb->len) { | |
121 | set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
122 | sent = tty->driver->write(tty, cb->buf + cb->offset, cb->len); | |
123 | if (sent < 0) { | |
124 | /* error */ | |
125 | gig_dbg(DEBUG_OUTPUT, "send_cb: write error %d", sent); | |
126 | flush_send_queue(cs); | |
127 | return sent; | |
128 | } | |
129 | cb->offset += sent; | |
130 | cb->len -= sent; | |
131 | gig_dbg(DEBUG_OUTPUT, "send_cb: sent %d, left %u, queued %u", | |
132 | sent, cb->len, cs->cmdbytes); | |
133 | } | |
134 | ||
135 | while (cb && !cb->len) { | |
136 | spin_lock_irqsave(&cs->cmdlock, flags); | |
137 | cs->cmdbytes -= cs->curlen; | |
138 | tcb = cb; | |
139 | cs->cmdbuf = cb = cb->next; | |
140 | if (cb) { | |
141 | cb->prev = NULL; | |
142 | cs->curlen = cb->len; | |
143 | } else { | |
144 | cs->lastcmdbuf = NULL; | |
145 | cs->curlen = 0; | |
146 | } | |
147 | spin_unlock_irqrestore(&cs->cmdlock, flags); | |
148 | ||
149 | if (tcb->wake_tasklet) | |
150 | tasklet_schedule(tcb->wake_tasklet); | |
151 | kfree(tcb); | |
152 | } | |
153 | return sent; | |
154 | } | |
155 | ||
156 | /* | |
157 | * send queue tasklet | |
158 | * If there is already a skb opened, put data to the transfer buffer | |
159 | * by calling "write_modem". | |
160 | * Otherwise take a new skb out of the queue. | |
161 | */ | |
162 | static void gigaset_modem_fill(unsigned long data) | |
163 | { | |
164 | struct cardstate *cs = (struct cardstate *) data; | |
165 | struct bc_state *bcs; | |
166 | int sent = 0; | |
167 | ||
168 | if (!cs || !(bcs = cs->bcs)) { | |
169 | gig_dbg(DEBUG_OUTPUT, "%s: no cardstate", __func__); | |
170 | return; | |
171 | } | |
172 | if (!bcs->tx_skb) { | |
173 | /* no skb is being sent; send command if any */ | |
174 | sent = send_cb(cs); | |
175 | gig_dbg(DEBUG_OUTPUT, "%s: send_cb -> %d", __func__, sent); | |
176 | if (sent) | |
177 | /* something sent or error */ | |
178 | return; | |
179 | ||
180 | /* no command to send; get skb */ | |
181 | if (!(bcs->tx_skb = skb_dequeue(&bcs->squeue))) | |
182 | /* no skb either, nothing to do */ | |
183 | return; | |
184 | ||
185 | gig_dbg(DEBUG_INTR, "Dequeued skb (Adr: %lx)", | |
186 | (unsigned long) bcs->tx_skb); | |
187 | } | |
188 | ||
189 | /* send skb */ | |
190 | gig_dbg(DEBUG_OUTPUT, "%s: tx_skb", __func__); | |
191 | if (write_modem(cs) < 0) | |
192 | gig_dbg(DEBUG_OUTPUT, "%s: write_modem failed", __func__); | |
193 | } | |
194 | ||
195 | /* | |
196 | * throw away all data queued for sending | |
197 | */ | |
198 | static void flush_send_queue(struct cardstate *cs) | |
199 | { | |
200 | struct sk_buff *skb; | |
201 | struct cmdbuf_t *cb; | |
202 | unsigned long flags; | |
203 | ||
204 | /* command queue */ | |
205 | spin_lock_irqsave(&cs->cmdlock, flags); | |
206 | while ((cb = cs->cmdbuf) != NULL) { | |
207 | cs->cmdbuf = cb->next; | |
208 | if (cb->wake_tasklet) | |
209 | tasklet_schedule(cb->wake_tasklet); | |
210 | kfree(cb); | |
211 | } | |
212 | cs->cmdbuf = cs->lastcmdbuf = NULL; | |
213 | cs->cmdbytes = cs->curlen = 0; | |
214 | spin_unlock_irqrestore(&cs->cmdlock, flags); | |
215 | ||
216 | /* data queue */ | |
217 | if (cs->bcs->tx_skb) | |
218 | dev_kfree_skb_any(cs->bcs->tx_skb); | |
219 | while ((skb = skb_dequeue(&cs->bcs->squeue)) != NULL) | |
220 | dev_kfree_skb_any(skb); | |
221 | } | |
222 | ||
223 | ||
224 | /* Gigaset Driver Interface */ | |
225 | /* ======================== */ | |
226 | ||
227 | /* | |
228 | * queue an AT command string for transmission to the Gigaset device | |
229 | * parameters: | |
230 | * cs controller state structure | |
231 | * buf buffer containing the string to send | |
232 | * len number of characters to send | |
233 | * wake_tasklet tasklet to run when transmission is complete, or NULL | |
234 | * return value: | |
235 | * number of bytes queued, or error code < 0 | |
236 | */ | |
237 | static int gigaset_write_cmd(struct cardstate *cs, const unsigned char *buf, | |
238 | int len, struct tasklet_struct *wake_tasklet) | |
239 | { | |
240 | struct cmdbuf_t *cb; | |
241 | unsigned long flags; | |
242 | ||
9d4bee2b | 243 | gigaset_dbg_buffer(cs->mstate != MS_LOCKED ? |
2869b23e TS |
244 | DEBUG_TRANSCMD : DEBUG_LOCKCMD, |
245 | "CMD Transmit", len, buf); | |
246 | ||
247 | if (len <= 0) | |
248 | return 0; | |
249 | ||
250 | if (!(cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC))) { | |
251 | dev_err(cs->dev, "%s: out of memory!\n", __func__); | |
252 | return -ENOMEM; | |
253 | } | |
254 | ||
255 | memcpy(cb->buf, buf, len); | |
256 | cb->len = len; | |
257 | cb->offset = 0; | |
258 | cb->next = NULL; | |
259 | cb->wake_tasklet = wake_tasklet; | |
260 | ||
261 | spin_lock_irqsave(&cs->cmdlock, flags); | |
262 | cb->prev = cs->lastcmdbuf; | |
263 | if (cs->lastcmdbuf) | |
264 | cs->lastcmdbuf->next = cb; | |
265 | else { | |
266 | cs->cmdbuf = cb; | |
267 | cs->curlen = len; | |
268 | } | |
269 | cs->cmdbytes += len; | |
270 | cs->lastcmdbuf = cb; | |
271 | spin_unlock_irqrestore(&cs->cmdlock, flags); | |
272 | ||
273 | spin_lock_irqsave(&cs->lock, flags); | |
274 | if (cs->connected) | |
275 | tasklet_schedule(&cs->write_tasklet); | |
276 | spin_unlock_irqrestore(&cs->lock, flags); | |
277 | return len; | |
278 | } | |
279 | ||
280 | /* | |
281 | * tty_driver.write_room interface routine | |
282 | * return number of characters the driver will accept to be written | |
283 | * parameter: | |
284 | * controller state structure | |
285 | * return value: | |
286 | * number of characters | |
287 | */ | |
288 | static int gigaset_write_room(struct cardstate *cs) | |
289 | { | |
290 | unsigned bytes; | |
291 | ||
292 | bytes = cs->cmdbytes; | |
293 | return bytes < IF_WRITEBUF ? IF_WRITEBUF - bytes : 0; | |
294 | } | |
295 | ||
296 | /* | |
297 | * tty_driver.chars_in_buffer interface routine | |
298 | * return number of characters waiting to be sent | |
299 | * parameter: | |
300 | * controller state structure | |
301 | * return value: | |
302 | * number of characters | |
303 | */ | |
304 | static int gigaset_chars_in_buffer(struct cardstate *cs) | |
305 | { | |
306 | return cs->cmdbytes; | |
307 | } | |
308 | ||
309 | /* | |
310 | * implementation of ioctl(GIGASET_BRKCHARS) | |
311 | * parameter: | |
312 | * controller state structure | |
313 | * return value: | |
314 | * -EINVAL (unimplemented function) | |
315 | */ | |
316 | static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6]) | |
317 | { | |
318 | /* not implemented */ | |
319 | return -EINVAL; | |
320 | } | |
321 | ||
322 | /* | |
323 | * Open B channel | |
324 | * Called by "do_action" in ev-layer.c | |
325 | */ | |
326 | static int gigaset_init_bchannel(struct bc_state *bcs) | |
327 | { | |
328 | /* nothing to do for M10x */ | |
329 | gigaset_bchannel_up(bcs); | |
330 | return 0; | |
331 | } | |
332 | ||
333 | /* | |
334 | * Close B channel | |
335 | * Called by "do_action" in ev-layer.c | |
336 | */ | |
337 | static int gigaset_close_bchannel(struct bc_state *bcs) | |
338 | { | |
339 | /* nothing to do for M10x */ | |
340 | gigaset_bchannel_down(bcs); | |
341 | return 0; | |
342 | } | |
343 | ||
344 | /* | |
345 | * Set up B channel structure | |
346 | * This is called by "gigaset_initcs" in common.c | |
347 | */ | |
348 | static int gigaset_initbcshw(struct bc_state *bcs) | |
349 | { | |
350 | /* unused */ | |
351 | bcs->hw.ser = NULL; | |
352 | return 1; | |
353 | } | |
354 | ||
355 | /* | |
356 | * Free B channel structure | |
357 | * Called by "gigaset_freebcs" in common.c | |
358 | */ | |
359 | static int gigaset_freebcshw(struct bc_state *bcs) | |
360 | { | |
361 | /* unused */ | |
362 | return 1; | |
363 | } | |
364 | ||
365 | /* | |
366 | * Reinitialize B channel structure | |
367 | * This is called by "bcs_reinit" in common.c | |
368 | */ | |
369 | static void gigaset_reinitbcshw(struct bc_state *bcs) | |
370 | { | |
371 | /* nothing to do for M10x */ | |
372 | } | |
373 | ||
374 | /* | |
375 | * Free hardware specific device data | |
376 | * This will be called by "gigaset_freecs" in common.c | |
377 | */ | |
378 | static void gigaset_freecshw(struct cardstate *cs) | |
379 | { | |
380 | tasklet_kill(&cs->write_tasklet); | |
381 | if (!cs->hw.ser) | |
382 | return; | |
383 | dev_set_drvdata(&cs->hw.ser->dev.dev, NULL); | |
384 | platform_device_unregister(&cs->hw.ser->dev); | |
385 | kfree(cs->hw.ser); | |
386 | cs->hw.ser = NULL; | |
387 | } | |
388 | ||
389 | static void gigaset_device_release(struct device *dev) | |
390 | { | |
391 | struct platform_device *pdev = | |
392 | container_of(dev, struct platform_device, dev); | |
393 | ||
394 | /* adapted from platform_device_release() in drivers/base/platform.c */ | |
395 | //FIXME is this actually necessary? | |
396 | kfree(dev->platform_data); | |
397 | kfree(pdev->resource); | |
398 | } | |
399 | ||
400 | /* | |
401 | * Set up hardware specific device data | |
402 | * This is called by "gigaset_initcs" in common.c | |
403 | */ | |
404 | static int gigaset_initcshw(struct cardstate *cs) | |
405 | { | |
406 | int rc; | |
407 | ||
408 | if (!(cs->hw.ser = kzalloc(sizeof(struct ser_cardstate), GFP_KERNEL))) { | |
409 | err("%s: out of memory!", __func__); | |
410 | return 0; | |
411 | } | |
412 | ||
413 | cs->hw.ser->dev.name = GIGASET_MODULENAME; | |
414 | cs->hw.ser->dev.id = cs->minor_index; | |
415 | cs->hw.ser->dev.dev.release = gigaset_device_release; | |
416 | if ((rc = platform_device_register(&cs->hw.ser->dev)) != 0) { | |
417 | err("error %d registering platform device", rc); | |
418 | kfree(cs->hw.ser); | |
419 | cs->hw.ser = NULL; | |
420 | return 0; | |
421 | } | |
422 | dev_set_drvdata(&cs->hw.ser->dev.dev, cs); | |
423 | ||
424 | tasklet_init(&cs->write_tasklet, | |
425 | &gigaset_modem_fill, (unsigned long) cs); | |
426 | return 1; | |
427 | } | |
428 | ||
429 | /* | |
430 | * set modem control lines | |
431 | * Parameters: | |
432 | * card state structure | |
433 | * modem control line state ([TIOCM_DTR]|[TIOCM_RTS]) | |
434 | * Called by "gigaset_start" and "gigaset_enterconfigmode" in common.c | |
435 | * and by "if_lock" and "if_termios" in interface.c | |
436 | */ | |
437 | static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state, unsigned new_state) | |
438 | { | |
439 | struct tty_struct *tty = cs->hw.ser->tty; | |
440 | unsigned int set, clear; | |
441 | ||
442 | if (!tty || !tty->driver || !tty->driver->tiocmset) | |
443 | return -EFAULT; | |
444 | set = new_state & ~old_state; | |
445 | clear = old_state & ~new_state; | |
446 | if (!set && !clear) | |
447 | return 0; | |
448 | gig_dbg(DEBUG_IF, "tiocmset set %x clear %x", set, clear); | |
449 | return tty->driver->tiocmset(tty, NULL, set, clear); | |
450 | } | |
451 | ||
452 | static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag) | |
453 | { | |
454 | return -EINVAL; | |
455 | } | |
456 | ||
457 | static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag) | |
458 | { | |
459 | return -EINVAL; | |
460 | } | |
461 | ||
35dc8457 | 462 | static const struct gigaset_ops ops = { |
2869b23e TS |
463 | gigaset_write_cmd, |
464 | gigaset_write_room, | |
465 | gigaset_chars_in_buffer, | |
466 | gigaset_brkchars, | |
467 | gigaset_init_bchannel, | |
468 | gigaset_close_bchannel, | |
469 | gigaset_initbcshw, | |
470 | gigaset_freebcshw, | |
471 | gigaset_reinitbcshw, | |
472 | gigaset_initcshw, | |
473 | gigaset_freecshw, | |
474 | gigaset_set_modem_ctrl, | |
475 | gigaset_baud_rate, | |
476 | gigaset_set_line_ctrl, | |
477 | gigaset_m10x_send_skb, /* asyncdata.c */ | |
478 | gigaset_m10x_input, /* asyncdata.c */ | |
479 | }; | |
480 | ||
481 | ||
482 | /* Line Discipline Interface */ | |
483 | /* ========================= */ | |
484 | ||
485 | /* helper functions for cardstate refcounting */ | |
486 | static struct cardstate *cs_get(struct tty_struct *tty) | |
487 | { | |
488 | struct cardstate *cs = tty->disc_data; | |
489 | ||
490 | if (!cs || !cs->hw.ser) { | |
491 | gig_dbg(DEBUG_ANY, "%s: no cardstate", __func__); | |
492 | return NULL; | |
493 | } | |
494 | atomic_inc(&cs->hw.ser->refcnt); | |
495 | return cs; | |
496 | } | |
497 | ||
498 | static void cs_put(struct cardstate *cs) | |
499 | { | |
500 | if (atomic_dec_and_test(&cs->hw.ser->refcnt)) | |
501 | mutex_unlock(&cs->hw.ser->dead_mutex); | |
502 | } | |
503 | ||
504 | /* | |
505 | * Called by the tty driver when the line discipline is pushed onto the tty. | |
506 | * Called in process context. | |
507 | */ | |
508 | static int | |
509 | gigaset_tty_open(struct tty_struct *tty) | |
510 | { | |
511 | struct cardstate *cs; | |
512 | ||
513 | gig_dbg(DEBUG_INIT, "Starting HLL for Gigaset M101"); | |
514 | ||
515 | info(DRIVER_AUTHOR); | |
516 | info(DRIVER_DESC); | |
517 | ||
518 | if (!driver) { | |
519 | err("%s: no driver structure", __func__); | |
520 | return -ENODEV; | |
521 | } | |
522 | ||
523 | /* allocate memory for our device state and intialize it */ | |
524 | if (!(cs = gigaset_initcs(driver, 1, 1, 0, cidmode, | |
525 | GIGASET_MODULENAME))) | |
526 | goto error; | |
527 | ||
528 | cs->dev = &cs->hw.ser->dev.dev; | |
529 | cs->hw.ser->tty = tty; | |
530 | mutex_init(&cs->hw.ser->dead_mutex); | |
531 | atomic_set(&cs->hw.ser->refcnt, 1); | |
532 | ||
533 | tty->disc_data = cs; | |
534 | ||
535 | /* OK.. Initialization of the datastructures and the HW is done.. Now | |
536 | * startup system and notify the LL that we are ready to run | |
537 | */ | |
538 | if (startmode == SM_LOCKED) | |
9d4bee2b | 539 | cs->mstate = MS_LOCKED; |
2869b23e TS |
540 | if (!gigaset_start(cs)) { |
541 | tasklet_kill(&cs->write_tasklet); | |
542 | goto error; | |
543 | } | |
544 | ||
545 | gig_dbg(DEBUG_INIT, "Startup of HLL done"); | |
546 | mutex_lock(&cs->hw.ser->dead_mutex); | |
547 | return 0; | |
548 | ||
549 | error: | |
550 | gig_dbg(DEBUG_INIT, "Startup of HLL failed"); | |
551 | tty->disc_data = NULL; | |
552 | gigaset_freecs(cs); | |
553 | return -ENODEV; | |
554 | } | |
555 | ||
556 | /* | |
557 | * Called by the tty driver when the line discipline is removed. | |
558 | * Called from process context. | |
559 | */ | |
560 | static void | |
561 | gigaset_tty_close(struct tty_struct *tty) | |
562 | { | |
563 | struct cardstate *cs = tty->disc_data; | |
564 | ||
565 | gig_dbg(DEBUG_INIT, "Stopping HLL for Gigaset M101"); | |
566 | ||
567 | if (!cs) { | |
568 | gig_dbg(DEBUG_INIT, "%s: no cardstate", __func__); | |
569 | return; | |
570 | } | |
571 | ||
572 | /* prevent other callers from entering ldisc methods */ | |
573 | tty->disc_data = NULL; | |
574 | ||
575 | if (!cs->hw.ser) | |
576 | err("%s: no hw cardstate", __func__); | |
577 | else { | |
578 | /* wait for running methods to finish */ | |
579 | if (!atomic_dec_and_test(&cs->hw.ser->refcnt)) | |
580 | mutex_lock(&cs->hw.ser->dead_mutex); | |
581 | } | |
582 | ||
583 | /* stop operations */ | |
584 | gigaset_stop(cs); | |
585 | tasklet_kill(&cs->write_tasklet); | |
586 | flush_send_queue(cs); | |
587 | cs->dev = NULL; | |
588 | gigaset_freecs(cs); | |
589 | ||
590 | gig_dbg(DEBUG_INIT, "Shutdown of HLL done"); | |
591 | } | |
592 | ||
593 | /* | |
594 | * Called by the tty driver when the tty line is hung up. | |
595 | * Wait for I/O to driver to complete and unregister ISDN device. | |
596 | * This is already done by the close routine, so just call that. | |
597 | * Called from process context. | |
598 | */ | |
599 | static int gigaset_tty_hangup(struct tty_struct *tty) | |
600 | { | |
601 | gigaset_tty_close(tty); | |
602 | return 0; | |
603 | } | |
604 | ||
605 | /* | |
606 | * Read on the tty. | |
607 | * Unused, received data goes only to the Gigaset driver. | |
608 | */ | |
609 | static ssize_t | |
610 | gigaset_tty_read(struct tty_struct *tty, struct file *file, | |
611 | unsigned char __user *buf, size_t count) | |
612 | { | |
613 | return -EAGAIN; | |
614 | } | |
615 | ||
616 | /* | |
617 | * Write on the tty. | |
618 | * Unused, transmit data comes only from the Gigaset driver. | |
619 | */ | |
620 | static ssize_t | |
621 | gigaset_tty_write(struct tty_struct *tty, struct file *file, | |
622 | const unsigned char *buf, size_t count) | |
623 | { | |
624 | return -EAGAIN; | |
625 | } | |
626 | ||
627 | /* | |
628 | * Ioctl on the tty. | |
629 | * Called in process context only. | |
630 | * May be re-entered by multiple ioctl calling threads. | |
631 | */ | |
632 | static int | |
633 | gigaset_tty_ioctl(struct tty_struct *tty, struct file *file, | |
634 | unsigned int cmd, unsigned long arg) | |
635 | { | |
636 | struct cardstate *cs = cs_get(tty); | |
637 | int rc, val; | |
638 | int __user *p = (int __user *)arg; | |
639 | ||
640 | if (!cs) | |
641 | return -ENXIO; | |
642 | ||
643 | switch (cmd) { | |
644 | case TCGETS: | |
645 | case TCGETA: | |
646 | /* pass through to underlying serial device */ | |
647 | rc = n_tty_ioctl(tty, file, cmd, arg); | |
648 | break; | |
649 | ||
650 | case TCFLSH: | |
651 | /* flush our buffers and the serial port's buffer */ | |
652 | switch (arg) { | |
653 | case TCIFLUSH: | |
654 | /* no own input buffer to flush */ | |
655 | break; | |
656 | case TCIOFLUSH: | |
657 | case TCOFLUSH: | |
658 | flush_send_queue(cs); | |
659 | break; | |
660 | } | |
661 | /* flush the serial port's buffer */ | |
662 | rc = n_tty_ioctl(tty, file, cmd, arg); | |
663 | break; | |
664 | ||
665 | case FIONREAD: | |
666 | /* unused, always return zero */ | |
667 | val = 0; | |
668 | rc = put_user(val, p); | |
669 | break; | |
670 | ||
671 | default: | |
672 | rc = -ENOIOCTLCMD; | |
673 | } | |
674 | ||
675 | cs_put(cs); | |
676 | return rc; | |
677 | } | |
678 | ||
679 | /* | |
680 | * Poll on the tty. | |
681 | * Unused, always return zero. | |
682 | */ | |
683 | static unsigned int | |
684 | gigaset_tty_poll(struct tty_struct *tty, struct file *file, poll_table *wait) | |
685 | { | |
686 | return 0; | |
687 | } | |
688 | ||
689 | /* | |
690 | * Called by the tty driver when a block of data has been received. | |
691 | * Will not be re-entered while running but other ldisc functions | |
692 | * may be called in parallel. | |
693 | * Can be called from hard interrupt level as well as soft interrupt | |
694 | * level or mainline. | |
695 | * Parameters: | |
696 | * tty tty structure | |
697 | * buf buffer containing received characters | |
698 | * cflags buffer containing error flags for received characters (ignored) | |
699 | * count number of received characters | |
700 | */ | |
701 | static void | |
702 | gigaset_tty_receive(struct tty_struct *tty, const unsigned char *buf, | |
703 | char *cflags, int count) | |
704 | { | |
705 | struct cardstate *cs = cs_get(tty); | |
706 | unsigned tail, head, n; | |
707 | struct inbuf_t *inbuf; | |
708 | ||
709 | if (!cs) | |
710 | return; | |
711 | if (!(inbuf = cs->inbuf)) { | |
712 | dev_err(cs->dev, "%s: no inbuf\n", __func__); | |
713 | cs_put(cs); | |
714 | return; | |
715 | } | |
716 | ||
9d4bee2b TS |
717 | tail = inbuf->tail; |
718 | head = inbuf->head; | |
2869b23e TS |
719 | gig_dbg(DEBUG_INTR, "buffer state: %u -> %u, receive %u bytes", |
720 | head, tail, count); | |
721 | ||
722 | if (head <= tail) { | |
723 | /* possible buffer wraparound */ | |
724 | n = min_t(unsigned, count, RBUFSIZE - tail); | |
725 | memcpy(inbuf->data + tail, buf, n); | |
726 | tail = (tail + n) % RBUFSIZE; | |
727 | buf += n; | |
728 | count -= n; | |
729 | } | |
730 | ||
731 | if (count > 0) { | |
732 | /* tail < head and some data left */ | |
733 | n = head - tail - 1; | |
734 | if (count > n) { | |
735 | dev_err(cs->dev, | |
736 | "inbuf overflow, discarding %d bytes\n", | |
737 | count - n); | |
738 | count = n; | |
739 | } | |
740 | memcpy(inbuf->data + tail, buf, count); | |
741 | tail += count; | |
742 | } | |
743 | ||
744 | gig_dbg(DEBUG_INTR, "setting tail to %u", tail); | |
9d4bee2b | 745 | inbuf->tail = tail; |
2869b23e TS |
746 | |
747 | /* Everything was received .. Push data into handler */ | |
748 | gig_dbg(DEBUG_INTR, "%s-->BH", __func__); | |
749 | gigaset_schedule_event(cs); | |
750 | cs_put(cs); | |
751 | } | |
752 | ||
753 | /* | |
754 | * Called by the tty driver when there's room for more data to send. | |
755 | */ | |
756 | static void | |
757 | gigaset_tty_wakeup(struct tty_struct *tty) | |
758 | { | |
759 | struct cardstate *cs = cs_get(tty); | |
760 | ||
761 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
762 | if (!cs) | |
763 | return; | |
764 | tasklet_schedule(&cs->write_tasklet); | |
765 | cs_put(cs); | |
766 | } | |
767 | ||
768 | static struct tty_ldisc gigaset_ldisc = { | |
769 | .owner = THIS_MODULE, | |
770 | .magic = TTY_LDISC_MAGIC, | |
771 | .name = "ser_gigaset", | |
772 | .open = gigaset_tty_open, | |
773 | .close = gigaset_tty_close, | |
774 | .hangup = gigaset_tty_hangup, | |
775 | .read = gigaset_tty_read, | |
776 | .write = gigaset_tty_write, | |
777 | .ioctl = gigaset_tty_ioctl, | |
778 | .poll = gigaset_tty_poll, | |
779 | .receive_buf = gigaset_tty_receive, | |
780 | .write_wakeup = gigaset_tty_wakeup, | |
781 | }; | |
782 | ||
783 | ||
784 | /* Initialization / Shutdown */ | |
785 | /* ========================= */ | |
786 | ||
787 | static int __init ser_gigaset_init(void) | |
788 | { | |
789 | int rc; | |
790 | ||
791 | gig_dbg(DEBUG_INIT, "%s", __func__); | |
792 | if ((rc = platform_driver_register(&device_driver)) != 0) { | |
793 | err("error %d registering platform driver", rc); | |
794 | return rc; | |
795 | } | |
796 | ||
797 | /* allocate memory for our driver state and intialize it */ | |
798 | if (!(driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS, | |
799 | GIGASET_MODULENAME, GIGASET_DEVNAME, | |
800 | &ops, THIS_MODULE))) | |
801 | goto error; | |
802 | ||
803 | if ((rc = tty_register_ldisc(N_GIGASET_M101, &gigaset_ldisc)) != 0) { | |
804 | err("error %d registering line discipline", rc); | |
805 | goto error; | |
806 | } | |
807 | ||
808 | return 0; | |
809 | ||
810 | error: | |
811 | if (driver) { | |
812 | gigaset_freedriver(driver); | |
813 | driver = NULL; | |
814 | } | |
815 | platform_driver_unregister(&device_driver); | |
816 | return rc; | |
817 | } | |
818 | ||
819 | static void __exit ser_gigaset_exit(void) | |
820 | { | |
821 | int rc; | |
822 | ||
823 | gig_dbg(DEBUG_INIT, "%s", __func__); | |
824 | ||
825 | if (driver) { | |
826 | gigaset_freedriver(driver); | |
827 | driver = NULL; | |
828 | } | |
829 | ||
830 | if ((rc = tty_unregister_ldisc(N_GIGASET_M101)) != 0) | |
831 | err("error %d unregistering line discipline", rc); | |
832 | ||
833 | platform_driver_unregister(&device_driver); | |
834 | } | |
835 | ||
836 | module_init(ser_gigaset_init); | |
837 | module_exit(ser_gigaset_exit); |