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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> | |
ee51ef0e | 20 | #include <linux/completion.h> |
2869b23e TS |
21 | |
22 | /* Version Information */ | |
23 | #define DRIVER_AUTHOR "Tilman Schmidt" | |
24 | #define DRIVER_DESC "Serial Driver for Gigaset 307x using Siemens M101" | |
25 | ||
26 | #define GIGASET_MINORS 1 | |
27 | #define GIGASET_MINOR 0 | |
28 | #define GIGASET_MODULENAME "ser_gigaset" | |
29 | #define GIGASET_DEVNAME "ttyGS" | |
30 | ||
31 | /* length limit according to Siemens 3070usb-protokoll.doc ch. 2.1 */ | |
32 | #define IF_WRITEBUF 264 | |
33 | ||
34 | MODULE_AUTHOR(DRIVER_AUTHOR); | |
35 | MODULE_DESCRIPTION(DRIVER_DESC); | |
36 | MODULE_LICENSE("GPL"); | |
37 | MODULE_ALIAS_LDISC(N_GIGASET_M101); | |
38 | ||
39 | static int startmode = SM_ISDN; | |
40 | module_param(startmode, int, S_IRUGO); | |
41 | MODULE_PARM_DESC(startmode, "initial operation mode"); | |
42 | static int cidmode = 1; | |
43 | module_param(cidmode, int, S_IRUGO); | |
44 | MODULE_PARM_DESC(cidmode, "stay in CID mode when idle"); | |
45 | ||
46 | static struct gigaset_driver *driver; | |
47 | ||
48 | struct ser_cardstate { | |
49 | struct platform_device dev; | |
50 | struct tty_struct *tty; | |
51 | atomic_t refcnt; | |
ee51ef0e | 52 | struct completion dead_cmp; |
2869b23e TS |
53 | }; |
54 | ||
55 | static struct platform_driver device_driver = { | |
56 | .driver = { | |
57 | .name = GIGASET_MODULENAME, | |
58 | }, | |
59 | }; | |
60 | ||
61 | static void flush_send_queue(struct cardstate *); | |
62 | ||
63 | /* transmit data from current open skb | |
64 | * result: number of bytes sent or error code < 0 | |
65 | */ | |
66 | static int write_modem(struct cardstate *cs) | |
67 | { | |
68 | struct tty_struct *tty = cs->hw.ser->tty; | |
69 | struct bc_state *bcs = &cs->bcs[0]; /* only one channel */ | |
70 | struct sk_buff *skb = bcs->tx_skb; | |
71 | int sent; | |
72 | ||
73 | if (!tty || !tty->driver || !skb) | |
74 | return -EFAULT; | |
75 | ||
76 | if (!skb->len) { | |
77 | dev_kfree_skb_any(skb); | |
78 | bcs->tx_skb = NULL; | |
79 | return -EINVAL; | |
80 | } | |
81 | ||
82 | set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
83 | sent = tty->driver->write(tty, skb->data, skb->len); | |
84 | gig_dbg(DEBUG_OUTPUT, "write_modem: sent %d", sent); | |
85 | if (sent < 0) { | |
86 | /* error */ | |
87 | flush_send_queue(cs); | |
88 | return sent; | |
89 | } | |
90 | skb_pull(skb, sent); | |
91 | if (!skb->len) { | |
92 | /* skb sent completely */ | |
93 | gigaset_skb_sent(bcs, skb); | |
94 | ||
95 | gig_dbg(DEBUG_INTR, "kfree skb (Adr: %lx)!", | |
96 | (unsigned long) skb); | |
97 | dev_kfree_skb_any(skb); | |
98 | bcs->tx_skb = NULL; | |
99 | } | |
100 | return sent; | |
101 | } | |
102 | ||
103 | /* | |
104 | * transmit first queued command buffer | |
105 | * result: number of bytes sent or error code < 0 | |
106 | */ | |
107 | static int send_cb(struct cardstate *cs) | |
108 | { | |
109 | struct tty_struct *tty = cs->hw.ser->tty; | |
110 | struct cmdbuf_t *cb, *tcb; | |
111 | unsigned long flags; | |
112 | int sent = 0; | |
113 | ||
114 | if (!tty || !tty->driver) | |
115 | return -EFAULT; | |
116 | ||
117 | cb = cs->cmdbuf; | |
118 | if (!cb) | |
119 | return 0; /* nothing to do */ | |
120 | ||
121 | if (cb->len) { | |
122 | set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
123 | sent = tty->driver->write(tty, cb->buf + cb->offset, cb->len); | |
124 | if (sent < 0) { | |
125 | /* error */ | |
126 | gig_dbg(DEBUG_OUTPUT, "send_cb: write error %d", sent); | |
127 | flush_send_queue(cs); | |
128 | return sent; | |
129 | } | |
130 | cb->offset += sent; | |
131 | cb->len -= sent; | |
132 | gig_dbg(DEBUG_OUTPUT, "send_cb: sent %d, left %u, queued %u", | |
133 | sent, cb->len, cs->cmdbytes); | |
134 | } | |
135 | ||
136 | while (cb && !cb->len) { | |
137 | spin_lock_irqsave(&cs->cmdlock, flags); | |
138 | cs->cmdbytes -= cs->curlen; | |
139 | tcb = cb; | |
140 | cs->cmdbuf = cb = cb->next; | |
141 | if (cb) { | |
142 | cb->prev = NULL; | |
143 | cs->curlen = cb->len; | |
144 | } else { | |
145 | cs->lastcmdbuf = NULL; | |
146 | cs->curlen = 0; | |
147 | } | |
148 | spin_unlock_irqrestore(&cs->cmdlock, flags); | |
149 | ||
150 | if (tcb->wake_tasklet) | |
151 | tasklet_schedule(tcb->wake_tasklet); | |
152 | kfree(tcb); | |
153 | } | |
154 | return sent; | |
155 | } | |
156 | ||
157 | /* | |
158 | * send queue tasklet | |
159 | * If there is already a skb opened, put data to the transfer buffer | |
160 | * by calling "write_modem". | |
161 | * Otherwise take a new skb out of the queue. | |
162 | */ | |
163 | static void gigaset_modem_fill(unsigned long data) | |
164 | { | |
165 | struct cardstate *cs = (struct cardstate *) data; | |
166 | struct bc_state *bcs; | |
167 | int sent = 0; | |
168 | ||
169 | if (!cs || !(bcs = cs->bcs)) { | |
170 | gig_dbg(DEBUG_OUTPUT, "%s: no cardstate", __func__); | |
171 | return; | |
172 | } | |
173 | if (!bcs->tx_skb) { | |
174 | /* no skb is being sent; send command if any */ | |
175 | sent = send_cb(cs); | |
176 | gig_dbg(DEBUG_OUTPUT, "%s: send_cb -> %d", __func__, sent); | |
177 | if (sent) | |
178 | /* something sent or error */ | |
179 | return; | |
180 | ||
181 | /* no command to send; get skb */ | |
182 | if (!(bcs->tx_skb = skb_dequeue(&bcs->squeue))) | |
183 | /* no skb either, nothing to do */ | |
184 | return; | |
185 | ||
186 | gig_dbg(DEBUG_INTR, "Dequeued skb (Adr: %lx)", | |
187 | (unsigned long) bcs->tx_skb); | |
188 | } | |
189 | ||
190 | /* send skb */ | |
191 | gig_dbg(DEBUG_OUTPUT, "%s: tx_skb", __func__); | |
192 | if (write_modem(cs) < 0) | |
193 | gig_dbg(DEBUG_OUTPUT, "%s: write_modem failed", __func__); | |
194 | } | |
195 | ||
196 | /* | |
197 | * throw away all data queued for sending | |
198 | */ | |
199 | static void flush_send_queue(struct cardstate *cs) | |
200 | { | |
201 | struct sk_buff *skb; | |
202 | struct cmdbuf_t *cb; | |
203 | unsigned long flags; | |
204 | ||
205 | /* command queue */ | |
206 | spin_lock_irqsave(&cs->cmdlock, flags); | |
207 | while ((cb = cs->cmdbuf) != NULL) { | |
208 | cs->cmdbuf = cb->next; | |
209 | if (cb->wake_tasklet) | |
210 | tasklet_schedule(cb->wake_tasklet); | |
211 | kfree(cb); | |
212 | } | |
213 | cs->cmdbuf = cs->lastcmdbuf = NULL; | |
214 | cs->cmdbytes = cs->curlen = 0; | |
215 | spin_unlock_irqrestore(&cs->cmdlock, flags); | |
216 | ||
217 | /* data queue */ | |
218 | if (cs->bcs->tx_skb) | |
219 | dev_kfree_skb_any(cs->bcs->tx_skb); | |
220 | while ((skb = skb_dequeue(&cs->bcs->squeue)) != NULL) | |
221 | dev_kfree_skb_any(skb); | |
222 | } | |
223 | ||
224 | ||
225 | /* Gigaset Driver Interface */ | |
226 | /* ======================== */ | |
227 | ||
228 | /* | |
229 | * queue an AT command string for transmission to the Gigaset device | |
230 | * parameters: | |
231 | * cs controller state structure | |
232 | * buf buffer containing the string to send | |
233 | * len number of characters to send | |
234 | * wake_tasklet tasklet to run when transmission is complete, or NULL | |
235 | * return value: | |
236 | * number of bytes queued, or error code < 0 | |
237 | */ | |
238 | static int gigaset_write_cmd(struct cardstate *cs, const unsigned char *buf, | |
239 | int len, struct tasklet_struct *wake_tasklet) | |
240 | { | |
241 | struct cmdbuf_t *cb; | |
242 | unsigned long flags; | |
243 | ||
9d4bee2b | 244 | gigaset_dbg_buffer(cs->mstate != MS_LOCKED ? |
2869b23e TS |
245 | DEBUG_TRANSCMD : DEBUG_LOCKCMD, |
246 | "CMD Transmit", len, buf); | |
247 | ||
248 | if (len <= 0) | |
249 | return 0; | |
250 | ||
251 | if (!(cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC))) { | |
252 | dev_err(cs->dev, "%s: out of memory!\n", __func__); | |
253 | return -ENOMEM; | |
254 | } | |
255 | ||
256 | memcpy(cb->buf, buf, len); | |
257 | cb->len = len; | |
258 | cb->offset = 0; | |
259 | cb->next = NULL; | |
260 | cb->wake_tasklet = wake_tasklet; | |
261 | ||
262 | spin_lock_irqsave(&cs->cmdlock, flags); | |
263 | cb->prev = cs->lastcmdbuf; | |
264 | if (cs->lastcmdbuf) | |
265 | cs->lastcmdbuf->next = cb; | |
266 | else { | |
267 | cs->cmdbuf = cb; | |
268 | cs->curlen = len; | |
269 | } | |
270 | cs->cmdbytes += len; | |
271 | cs->lastcmdbuf = cb; | |
272 | spin_unlock_irqrestore(&cs->cmdlock, flags); | |
273 | ||
274 | spin_lock_irqsave(&cs->lock, flags); | |
275 | if (cs->connected) | |
276 | tasklet_schedule(&cs->write_tasklet); | |
277 | spin_unlock_irqrestore(&cs->lock, flags); | |
278 | return len; | |
279 | } | |
280 | ||
281 | /* | |
282 | * tty_driver.write_room interface routine | |
283 | * return number of characters the driver will accept to be written | |
284 | * parameter: | |
285 | * controller state structure | |
286 | * return value: | |
287 | * number of characters | |
288 | */ | |
289 | static int gigaset_write_room(struct cardstate *cs) | |
290 | { | |
291 | unsigned bytes; | |
292 | ||
293 | bytes = cs->cmdbytes; | |
294 | return bytes < IF_WRITEBUF ? IF_WRITEBUF - bytes : 0; | |
295 | } | |
296 | ||
297 | /* | |
298 | * tty_driver.chars_in_buffer interface routine | |
299 | * return number of characters waiting to be sent | |
300 | * parameter: | |
301 | * controller state structure | |
302 | * return value: | |
303 | * number of characters | |
304 | */ | |
305 | static int gigaset_chars_in_buffer(struct cardstate *cs) | |
306 | { | |
307 | return cs->cmdbytes; | |
308 | } | |
309 | ||
310 | /* | |
311 | * implementation of ioctl(GIGASET_BRKCHARS) | |
312 | * parameter: | |
313 | * controller state structure | |
314 | * return value: | |
315 | * -EINVAL (unimplemented function) | |
316 | */ | |
317 | static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6]) | |
318 | { | |
319 | /* not implemented */ | |
320 | return -EINVAL; | |
321 | } | |
322 | ||
323 | /* | |
324 | * Open B channel | |
325 | * Called by "do_action" in ev-layer.c | |
326 | */ | |
327 | static int gigaset_init_bchannel(struct bc_state *bcs) | |
328 | { | |
329 | /* nothing to do for M10x */ | |
330 | gigaset_bchannel_up(bcs); | |
331 | return 0; | |
332 | } | |
333 | ||
334 | /* | |
335 | * Close B channel | |
336 | * Called by "do_action" in ev-layer.c | |
337 | */ | |
338 | static int gigaset_close_bchannel(struct bc_state *bcs) | |
339 | { | |
340 | /* nothing to do for M10x */ | |
341 | gigaset_bchannel_down(bcs); | |
342 | return 0; | |
343 | } | |
344 | ||
345 | /* | |
346 | * Set up B channel structure | |
347 | * This is called by "gigaset_initcs" in common.c | |
348 | */ | |
349 | static int gigaset_initbcshw(struct bc_state *bcs) | |
350 | { | |
351 | /* unused */ | |
352 | bcs->hw.ser = NULL; | |
353 | return 1; | |
354 | } | |
355 | ||
356 | /* | |
357 | * Free B channel structure | |
358 | * Called by "gigaset_freebcs" in common.c | |
359 | */ | |
360 | static int gigaset_freebcshw(struct bc_state *bcs) | |
361 | { | |
362 | /* unused */ | |
363 | return 1; | |
364 | } | |
365 | ||
366 | /* | |
367 | * Reinitialize B channel structure | |
368 | * This is called by "bcs_reinit" in common.c | |
369 | */ | |
370 | static void gigaset_reinitbcshw(struct bc_state *bcs) | |
371 | { | |
372 | /* nothing to do for M10x */ | |
373 | } | |
374 | ||
375 | /* | |
376 | * Free hardware specific device data | |
377 | * This will be called by "gigaset_freecs" in common.c | |
378 | */ | |
379 | static void gigaset_freecshw(struct cardstate *cs) | |
380 | { | |
381 | tasklet_kill(&cs->write_tasklet); | |
382 | if (!cs->hw.ser) | |
383 | return; | |
384 | dev_set_drvdata(&cs->hw.ser->dev.dev, NULL); | |
385 | platform_device_unregister(&cs->hw.ser->dev); | |
386 | kfree(cs->hw.ser); | |
387 | cs->hw.ser = NULL; | |
388 | } | |
389 | ||
390 | static void gigaset_device_release(struct device *dev) | |
391 | { | |
392 | struct platform_device *pdev = | |
393 | container_of(dev, struct platform_device, dev); | |
394 | ||
395 | /* adapted from platform_device_release() in drivers/base/platform.c */ | |
396 | //FIXME is this actually necessary? | |
397 | kfree(dev->platform_data); | |
398 | kfree(pdev->resource); | |
399 | } | |
400 | ||
401 | /* | |
402 | * Set up hardware specific device data | |
403 | * This is called by "gigaset_initcs" in common.c | |
404 | */ | |
405 | static int gigaset_initcshw(struct cardstate *cs) | |
406 | { | |
407 | int rc; | |
408 | ||
409 | if (!(cs->hw.ser = kzalloc(sizeof(struct ser_cardstate), GFP_KERNEL))) { | |
410 | err("%s: out of memory!", __func__); | |
411 | return 0; | |
412 | } | |
413 | ||
414 | cs->hw.ser->dev.name = GIGASET_MODULENAME; | |
415 | cs->hw.ser->dev.id = cs->minor_index; | |
416 | cs->hw.ser->dev.dev.release = gigaset_device_release; | |
417 | if ((rc = platform_device_register(&cs->hw.ser->dev)) != 0) { | |
418 | err("error %d registering platform device", rc); | |
419 | kfree(cs->hw.ser); | |
420 | cs->hw.ser = NULL; | |
421 | return 0; | |
422 | } | |
423 | dev_set_drvdata(&cs->hw.ser->dev.dev, cs); | |
424 | ||
425 | tasklet_init(&cs->write_tasklet, | |
426 | &gigaset_modem_fill, (unsigned long) cs); | |
427 | return 1; | |
428 | } | |
429 | ||
430 | /* | |
431 | * set modem control lines | |
432 | * Parameters: | |
433 | * card state structure | |
434 | * modem control line state ([TIOCM_DTR]|[TIOCM_RTS]) | |
435 | * Called by "gigaset_start" and "gigaset_enterconfigmode" in common.c | |
436 | * and by "if_lock" and "if_termios" in interface.c | |
437 | */ | |
438 | static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state, unsigned new_state) | |
439 | { | |
440 | struct tty_struct *tty = cs->hw.ser->tty; | |
441 | unsigned int set, clear; | |
442 | ||
443 | if (!tty || !tty->driver || !tty->driver->tiocmset) | |
444 | return -EFAULT; | |
445 | set = new_state & ~old_state; | |
446 | clear = old_state & ~new_state; | |
447 | if (!set && !clear) | |
448 | return 0; | |
449 | gig_dbg(DEBUG_IF, "tiocmset set %x clear %x", set, clear); | |
450 | return tty->driver->tiocmset(tty, NULL, set, clear); | |
451 | } | |
452 | ||
453 | static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag) | |
454 | { | |
455 | return -EINVAL; | |
456 | } | |
457 | ||
458 | static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag) | |
459 | { | |
460 | return -EINVAL; | |
461 | } | |
462 | ||
35dc8457 | 463 | static const struct gigaset_ops ops = { |
2869b23e TS |
464 | gigaset_write_cmd, |
465 | gigaset_write_room, | |
466 | gigaset_chars_in_buffer, | |
467 | gigaset_brkchars, | |
468 | gigaset_init_bchannel, | |
469 | gigaset_close_bchannel, | |
470 | gigaset_initbcshw, | |
471 | gigaset_freebcshw, | |
472 | gigaset_reinitbcshw, | |
473 | gigaset_initcshw, | |
474 | gigaset_freecshw, | |
475 | gigaset_set_modem_ctrl, | |
476 | gigaset_baud_rate, | |
477 | gigaset_set_line_ctrl, | |
478 | gigaset_m10x_send_skb, /* asyncdata.c */ | |
479 | gigaset_m10x_input, /* asyncdata.c */ | |
480 | }; | |
481 | ||
482 | ||
483 | /* Line Discipline Interface */ | |
484 | /* ========================= */ | |
485 | ||
486 | /* helper functions for cardstate refcounting */ | |
487 | static struct cardstate *cs_get(struct tty_struct *tty) | |
488 | { | |
489 | struct cardstate *cs = tty->disc_data; | |
490 | ||
491 | if (!cs || !cs->hw.ser) { | |
492 | gig_dbg(DEBUG_ANY, "%s: no cardstate", __func__); | |
493 | return NULL; | |
494 | } | |
495 | atomic_inc(&cs->hw.ser->refcnt); | |
496 | return cs; | |
497 | } | |
498 | ||
499 | static void cs_put(struct cardstate *cs) | |
500 | { | |
501 | if (atomic_dec_and_test(&cs->hw.ser->refcnt)) | |
ee51ef0e | 502 | complete(&cs->hw.ser->dead_cmp); |
2869b23e TS |
503 | } |
504 | ||
505 | /* | |
506 | * Called by the tty driver when the line discipline is pushed onto the tty. | |
507 | * Called in process context. | |
508 | */ | |
509 | static int | |
510 | gigaset_tty_open(struct tty_struct *tty) | |
511 | { | |
512 | struct cardstate *cs; | |
513 | ||
514 | gig_dbg(DEBUG_INIT, "Starting HLL for Gigaset M101"); | |
515 | ||
516 | info(DRIVER_AUTHOR); | |
517 | info(DRIVER_DESC); | |
518 | ||
519 | if (!driver) { | |
520 | err("%s: no driver structure", __func__); | |
521 | return -ENODEV; | |
522 | } | |
523 | ||
524 | /* allocate memory for our device state and intialize it */ | |
525 | if (!(cs = gigaset_initcs(driver, 1, 1, 0, cidmode, | |
526 | GIGASET_MODULENAME))) | |
527 | goto error; | |
528 | ||
529 | cs->dev = &cs->hw.ser->dev.dev; | |
530 | cs->hw.ser->tty = tty; | |
2869b23e | 531 | atomic_set(&cs->hw.ser->refcnt, 1); |
ee51ef0e | 532 | init_completion(&cs->hw.ser->dead_cmp); |
2869b23e TS |
533 | |
534 | tty->disc_data = cs; | |
535 | ||
536 | /* OK.. Initialization of the datastructures and the HW is done.. Now | |
537 | * startup system and notify the LL that we are ready to run | |
538 | */ | |
539 | if (startmode == SM_LOCKED) | |
9d4bee2b | 540 | cs->mstate = MS_LOCKED; |
2869b23e TS |
541 | if (!gigaset_start(cs)) { |
542 | tasklet_kill(&cs->write_tasklet); | |
543 | goto error; | |
544 | } | |
545 | ||
546 | gig_dbg(DEBUG_INIT, "Startup of HLL done"); | |
2869b23e TS |
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)) | |
ee51ef0e | 580 | wait_for_completion(&cs->hw.ser->dead_cmp); |
2869b23e TS |
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); |