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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> | |
ee51ef0e | 19 | #include <linux/completion.h> |
2869b23e TS |
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; | |
ee51ef0e | 51 | struct completion dead_cmp; |
2869b23e TS |
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; | |
f34d7a5b | 70 | int sent = -EOPNOTSUPP; |
2869b23e TS |
71 | |
72 | if (!tty || !tty->driver || !skb) | |
f34d7a5b | 73 | return -EINVAL; |
2869b23e TS |
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); | |
f34d7a5b AC |
82 | if (tty->ops->write) |
83 | sent = tty->ops->write(tty, skb->data, skb->len); | |
2869b23e TS |
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); | |
f34d7a5b | 123 | sent = tty->ops->write(tty, cb->buf + cb->offset, cb->len); |
2869b23e TS |
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; | |
ae67d7d8 | 167 | struct sk_buff *nextskb; |
2869b23e TS |
168 | int sent = 0; |
169 | ||
ae67d7d8 TS |
170 | if (!cs) { |
171 | gig_dbg(DEBUG_OUTPUT, "%s: no cardstate", __func__); | |
172 | return; | |
173 | } | |
174 | bcs = cs->bcs; | |
175 | if (!bcs) { | |
2869b23e TS |
176 | gig_dbg(DEBUG_OUTPUT, "%s: no cardstate", __func__); |
177 | return; | |
178 | } | |
179 | if (!bcs->tx_skb) { | |
180 | /* no skb is being sent; send command if any */ | |
181 | sent = send_cb(cs); | |
182 | gig_dbg(DEBUG_OUTPUT, "%s: send_cb -> %d", __func__, sent); | |
183 | if (sent) | |
184 | /* something sent or error */ | |
185 | return; | |
186 | ||
187 | /* no command to send; get skb */ | |
ae67d7d8 TS |
188 | nextskb = skb_dequeue(&bcs->squeue); |
189 | if (!nextskb) | |
2869b23e TS |
190 | /* no skb either, nothing to do */ |
191 | return; | |
ae67d7d8 | 192 | bcs->tx_skb = nextskb; |
2869b23e TS |
193 | |
194 | gig_dbg(DEBUG_INTR, "Dequeued skb (Adr: %lx)", | |
195 | (unsigned long) bcs->tx_skb); | |
196 | } | |
197 | ||
198 | /* send skb */ | |
199 | gig_dbg(DEBUG_OUTPUT, "%s: tx_skb", __func__); | |
200 | if (write_modem(cs) < 0) | |
201 | gig_dbg(DEBUG_OUTPUT, "%s: write_modem failed", __func__); | |
202 | } | |
203 | ||
204 | /* | |
205 | * throw away all data queued for sending | |
206 | */ | |
207 | static void flush_send_queue(struct cardstate *cs) | |
208 | { | |
209 | struct sk_buff *skb; | |
210 | struct cmdbuf_t *cb; | |
211 | unsigned long flags; | |
212 | ||
213 | /* command queue */ | |
214 | spin_lock_irqsave(&cs->cmdlock, flags); | |
215 | while ((cb = cs->cmdbuf) != NULL) { | |
216 | cs->cmdbuf = cb->next; | |
217 | if (cb->wake_tasklet) | |
218 | tasklet_schedule(cb->wake_tasklet); | |
219 | kfree(cb); | |
220 | } | |
221 | cs->cmdbuf = cs->lastcmdbuf = NULL; | |
222 | cs->cmdbytes = cs->curlen = 0; | |
223 | spin_unlock_irqrestore(&cs->cmdlock, flags); | |
224 | ||
225 | /* data queue */ | |
226 | if (cs->bcs->tx_skb) | |
227 | dev_kfree_skb_any(cs->bcs->tx_skb); | |
228 | while ((skb = skb_dequeue(&cs->bcs->squeue)) != NULL) | |
229 | dev_kfree_skb_any(skb); | |
230 | } | |
231 | ||
232 | ||
233 | /* Gigaset Driver Interface */ | |
234 | /* ======================== */ | |
235 | ||
236 | /* | |
237 | * queue an AT command string for transmission to the Gigaset device | |
238 | * parameters: | |
239 | * cs controller state structure | |
240 | * buf buffer containing the string to send | |
241 | * len number of characters to send | |
242 | * wake_tasklet tasklet to run when transmission is complete, or NULL | |
243 | * return value: | |
244 | * number of bytes queued, or error code < 0 | |
245 | */ | |
246 | static int gigaset_write_cmd(struct cardstate *cs, const unsigned char *buf, | |
ae67d7d8 | 247 | int len, struct tasklet_struct *wake_tasklet) |
2869b23e TS |
248 | { |
249 | struct cmdbuf_t *cb; | |
250 | unsigned long flags; | |
251 | ||
9d4bee2b | 252 | gigaset_dbg_buffer(cs->mstate != MS_LOCKED ? |
ae67d7d8 TS |
253 | DEBUG_TRANSCMD : DEBUG_LOCKCMD, |
254 | "CMD Transmit", len, buf); | |
2869b23e TS |
255 | |
256 | if (len <= 0) | |
257 | return 0; | |
258 | ||
ae67d7d8 TS |
259 | cb = kmalloc(sizeof(struct cmdbuf_t) + len, GFP_ATOMIC); |
260 | if (!cb) { | |
2869b23e TS |
261 | dev_err(cs->dev, "%s: out of memory!\n", __func__); |
262 | return -ENOMEM; | |
263 | } | |
264 | ||
265 | memcpy(cb->buf, buf, len); | |
266 | cb->len = len; | |
267 | cb->offset = 0; | |
268 | cb->next = NULL; | |
269 | cb->wake_tasklet = wake_tasklet; | |
270 | ||
271 | spin_lock_irqsave(&cs->cmdlock, flags); | |
272 | cb->prev = cs->lastcmdbuf; | |
273 | if (cs->lastcmdbuf) | |
274 | cs->lastcmdbuf->next = cb; | |
275 | else { | |
276 | cs->cmdbuf = cb; | |
277 | cs->curlen = len; | |
278 | } | |
279 | cs->cmdbytes += len; | |
280 | cs->lastcmdbuf = cb; | |
281 | spin_unlock_irqrestore(&cs->cmdlock, flags); | |
282 | ||
283 | spin_lock_irqsave(&cs->lock, flags); | |
284 | if (cs->connected) | |
285 | tasklet_schedule(&cs->write_tasklet); | |
286 | spin_unlock_irqrestore(&cs->lock, flags); | |
287 | return len; | |
288 | } | |
289 | ||
290 | /* | |
291 | * tty_driver.write_room interface routine | |
292 | * return number of characters the driver will accept to be written | |
293 | * parameter: | |
294 | * controller state structure | |
295 | * return value: | |
296 | * number of characters | |
297 | */ | |
298 | static int gigaset_write_room(struct cardstate *cs) | |
299 | { | |
300 | unsigned bytes; | |
301 | ||
302 | bytes = cs->cmdbytes; | |
303 | return bytes < IF_WRITEBUF ? IF_WRITEBUF - bytes : 0; | |
304 | } | |
305 | ||
306 | /* | |
307 | * tty_driver.chars_in_buffer interface routine | |
308 | * return number of characters waiting to be sent | |
309 | * parameter: | |
310 | * controller state structure | |
311 | * return value: | |
312 | * number of characters | |
313 | */ | |
314 | static int gigaset_chars_in_buffer(struct cardstate *cs) | |
315 | { | |
316 | return cs->cmdbytes; | |
317 | } | |
318 | ||
319 | /* | |
320 | * implementation of ioctl(GIGASET_BRKCHARS) | |
321 | * parameter: | |
322 | * controller state structure | |
323 | * return value: | |
324 | * -EINVAL (unimplemented function) | |
325 | */ | |
326 | static int gigaset_brkchars(struct cardstate *cs, const unsigned char buf[6]) | |
327 | { | |
328 | /* not implemented */ | |
329 | return -EINVAL; | |
330 | } | |
331 | ||
332 | /* | |
333 | * Open B channel | |
334 | * Called by "do_action" in ev-layer.c | |
335 | */ | |
336 | static int gigaset_init_bchannel(struct bc_state *bcs) | |
337 | { | |
338 | /* nothing to do for M10x */ | |
339 | gigaset_bchannel_up(bcs); | |
340 | return 0; | |
341 | } | |
342 | ||
343 | /* | |
344 | * Close B channel | |
345 | * Called by "do_action" in ev-layer.c | |
346 | */ | |
347 | static int gigaset_close_bchannel(struct bc_state *bcs) | |
348 | { | |
349 | /* nothing to do for M10x */ | |
350 | gigaset_bchannel_down(bcs); | |
351 | return 0; | |
352 | } | |
353 | ||
354 | /* | |
355 | * Set up B channel structure | |
356 | * This is called by "gigaset_initcs" in common.c | |
357 | */ | |
358 | static int gigaset_initbcshw(struct bc_state *bcs) | |
359 | { | |
360 | /* unused */ | |
361 | bcs->hw.ser = NULL; | |
362 | return 1; | |
363 | } | |
364 | ||
365 | /* | |
366 | * Free B channel structure | |
367 | * Called by "gigaset_freebcs" in common.c | |
368 | */ | |
369 | static int gigaset_freebcshw(struct bc_state *bcs) | |
370 | { | |
371 | /* unused */ | |
372 | return 1; | |
373 | } | |
374 | ||
375 | /* | |
376 | * Reinitialize B channel structure | |
377 | * This is called by "bcs_reinit" in common.c | |
378 | */ | |
379 | static void gigaset_reinitbcshw(struct bc_state *bcs) | |
380 | { | |
381 | /* nothing to do for M10x */ | |
382 | } | |
383 | ||
384 | /* | |
385 | * Free hardware specific device data | |
386 | * This will be called by "gigaset_freecs" in common.c | |
387 | */ | |
388 | static void gigaset_freecshw(struct cardstate *cs) | |
389 | { | |
390 | tasklet_kill(&cs->write_tasklet); | |
391 | if (!cs->hw.ser) | |
392 | return; | |
393 | dev_set_drvdata(&cs->hw.ser->dev.dev, NULL); | |
394 | platform_device_unregister(&cs->hw.ser->dev); | |
395 | kfree(cs->hw.ser); | |
396 | cs->hw.ser = NULL; | |
397 | } | |
398 | ||
399 | static void gigaset_device_release(struct device *dev) | |
400 | { | |
71b3e0c1 | 401 | struct platform_device *pdev = to_platform_device(dev); |
2869b23e TS |
402 | |
403 | /* adapted from platform_device_release() in drivers/base/platform.c */ | |
2869b23e TS |
404 | kfree(dev->platform_data); |
405 | kfree(pdev->resource); | |
406 | } | |
407 | ||
408 | /* | |
409 | * Set up hardware specific device data | |
410 | * This is called by "gigaset_initcs" in common.c | |
411 | */ | |
412 | static int gigaset_initcshw(struct cardstate *cs) | |
413 | { | |
414 | int rc; | |
ae67d7d8 | 415 | struct ser_cardstate *scs; |
2869b23e | 416 | |
ae67d7d8 TS |
417 | scs = kzalloc(sizeof(struct ser_cardstate), GFP_KERNEL); |
418 | if (!scs) { | |
c8770dca | 419 | pr_err("out of memory\n"); |
2869b23e TS |
420 | return 0; |
421 | } | |
ae67d7d8 | 422 | cs->hw.ser = scs; |
2869b23e TS |
423 | |
424 | cs->hw.ser->dev.name = GIGASET_MODULENAME; | |
425 | cs->hw.ser->dev.id = cs->minor_index; | |
426 | cs->hw.ser->dev.dev.release = gigaset_device_release; | |
ae67d7d8 TS |
427 | rc = platform_device_register(&cs->hw.ser->dev); |
428 | if (rc != 0) { | |
c8770dca | 429 | pr_err("error %d registering platform device\n", rc); |
2869b23e TS |
430 | kfree(cs->hw.ser); |
431 | cs->hw.ser = NULL; | |
432 | return 0; | |
433 | } | |
434 | dev_set_drvdata(&cs->hw.ser->dev.dev, cs); | |
435 | ||
436 | tasklet_init(&cs->write_tasklet, | |
ae67d7d8 | 437 | &gigaset_modem_fill, (unsigned long) cs); |
2869b23e TS |
438 | return 1; |
439 | } | |
440 | ||
441 | /* | |
442 | * set modem control lines | |
443 | * Parameters: | |
444 | * card state structure | |
445 | * modem control line state ([TIOCM_DTR]|[TIOCM_RTS]) | |
446 | * Called by "gigaset_start" and "gigaset_enterconfigmode" in common.c | |
447 | * and by "if_lock" and "if_termios" in interface.c | |
448 | */ | |
ae67d7d8 TS |
449 | static int gigaset_set_modem_ctrl(struct cardstate *cs, unsigned old_state, |
450 | unsigned new_state) | |
2869b23e TS |
451 | { |
452 | struct tty_struct *tty = cs->hw.ser->tty; | |
453 | unsigned int set, clear; | |
454 | ||
f34d7a5b AC |
455 | if (!tty || !tty->driver || !tty->ops->tiocmset) |
456 | return -EINVAL; | |
2869b23e TS |
457 | set = new_state & ~old_state; |
458 | clear = old_state & ~new_state; | |
459 | if (!set && !clear) | |
460 | return 0; | |
461 | gig_dbg(DEBUG_IF, "tiocmset set %x clear %x", set, clear); | |
f34d7a5b | 462 | return tty->ops->tiocmset(tty, NULL, set, clear); |
2869b23e TS |
463 | } |
464 | ||
465 | static int gigaset_baud_rate(struct cardstate *cs, unsigned cflag) | |
466 | { | |
467 | return -EINVAL; | |
468 | } | |
469 | ||
470 | static int gigaset_set_line_ctrl(struct cardstate *cs, unsigned cflag) | |
471 | { | |
472 | return -EINVAL; | |
473 | } | |
474 | ||
35dc8457 | 475 | static const struct gigaset_ops ops = { |
2869b23e TS |
476 | gigaset_write_cmd, |
477 | gigaset_write_room, | |
478 | gigaset_chars_in_buffer, | |
479 | gigaset_brkchars, | |
480 | gigaset_init_bchannel, | |
481 | gigaset_close_bchannel, | |
482 | gigaset_initbcshw, | |
483 | gigaset_freebcshw, | |
484 | gigaset_reinitbcshw, | |
485 | gigaset_initcshw, | |
486 | gigaset_freecshw, | |
487 | gigaset_set_modem_ctrl, | |
488 | gigaset_baud_rate, | |
489 | gigaset_set_line_ctrl, | |
490 | gigaset_m10x_send_skb, /* asyncdata.c */ | |
491 | gigaset_m10x_input, /* asyncdata.c */ | |
492 | }; | |
493 | ||
494 | ||
495 | /* Line Discipline Interface */ | |
496 | /* ========================= */ | |
497 | ||
498 | /* helper functions for cardstate refcounting */ | |
499 | static struct cardstate *cs_get(struct tty_struct *tty) | |
500 | { | |
501 | struct cardstate *cs = tty->disc_data; | |
502 | ||
503 | if (!cs || !cs->hw.ser) { | |
504 | gig_dbg(DEBUG_ANY, "%s: no cardstate", __func__); | |
505 | return NULL; | |
506 | } | |
507 | atomic_inc(&cs->hw.ser->refcnt); | |
508 | return cs; | |
509 | } | |
510 | ||
511 | static void cs_put(struct cardstate *cs) | |
512 | { | |
513 | if (atomic_dec_and_test(&cs->hw.ser->refcnt)) | |
ee51ef0e | 514 | complete(&cs->hw.ser->dead_cmp); |
2869b23e TS |
515 | } |
516 | ||
517 | /* | |
518 | * Called by the tty driver when the line discipline is pushed onto the tty. | |
519 | * Called in process context. | |
520 | */ | |
521 | static int | |
522 | gigaset_tty_open(struct tty_struct *tty) | |
523 | { | |
524 | struct cardstate *cs; | |
525 | ||
526 | gig_dbg(DEBUG_INIT, "Starting HLL for Gigaset M101"); | |
527 | ||
c8770dca | 528 | pr_info(DRIVER_DESC "\n"); |
2869b23e TS |
529 | |
530 | if (!driver) { | |
c8770dca | 531 | pr_err("%s: no driver structure\n", __func__); |
2869b23e TS |
532 | return -ENODEV; |
533 | } | |
534 | ||
535 | /* allocate memory for our device state and intialize it */ | |
ae67d7d8 TS |
536 | cs = gigaset_initcs(driver, 1, 1, 0, cidmode, GIGASET_MODULENAME); |
537 | if (!cs) | |
2869b23e TS |
538 | goto error; |
539 | ||
540 | cs->dev = &cs->hw.ser->dev.dev; | |
541 | cs->hw.ser->tty = tty; | |
2869b23e | 542 | atomic_set(&cs->hw.ser->refcnt, 1); |
ee51ef0e | 543 | init_completion(&cs->hw.ser->dead_cmp); |
2869b23e TS |
544 | |
545 | tty->disc_data = cs; | |
546 | ||
547 | /* OK.. Initialization of the datastructures and the HW is done.. Now | |
548 | * startup system and notify the LL that we are ready to run | |
549 | */ | |
550 | if (startmode == SM_LOCKED) | |
9d4bee2b | 551 | cs->mstate = MS_LOCKED; |
2869b23e TS |
552 | if (!gigaset_start(cs)) { |
553 | tasklet_kill(&cs->write_tasklet); | |
554 | goto error; | |
555 | } | |
556 | ||
557 | gig_dbg(DEBUG_INIT, "Startup of HLL done"); | |
2869b23e TS |
558 | return 0; |
559 | ||
560 | error: | |
561 | gig_dbg(DEBUG_INIT, "Startup of HLL failed"); | |
562 | tty->disc_data = NULL; | |
563 | gigaset_freecs(cs); | |
564 | return -ENODEV; | |
565 | } | |
566 | ||
567 | /* | |
568 | * Called by the tty driver when the line discipline is removed. | |
569 | * Called from process context. | |
570 | */ | |
571 | static void | |
572 | gigaset_tty_close(struct tty_struct *tty) | |
573 | { | |
574 | struct cardstate *cs = tty->disc_data; | |
575 | ||
576 | gig_dbg(DEBUG_INIT, "Stopping HLL for Gigaset M101"); | |
577 | ||
578 | if (!cs) { | |
579 | gig_dbg(DEBUG_INIT, "%s: no cardstate", __func__); | |
580 | return; | |
581 | } | |
582 | ||
583 | /* prevent other callers from entering ldisc methods */ | |
584 | tty->disc_data = NULL; | |
585 | ||
586 | if (!cs->hw.ser) | |
c8770dca | 587 | pr_err("%s: no hw cardstate\n", __func__); |
2869b23e TS |
588 | else { |
589 | /* wait for running methods to finish */ | |
590 | if (!atomic_dec_and_test(&cs->hw.ser->refcnt)) | |
ee51ef0e | 591 | wait_for_completion(&cs->hw.ser->dead_cmp); |
2869b23e TS |
592 | } |
593 | ||
594 | /* stop operations */ | |
595 | gigaset_stop(cs); | |
596 | tasklet_kill(&cs->write_tasklet); | |
597 | flush_send_queue(cs); | |
598 | cs->dev = NULL; | |
599 | gigaset_freecs(cs); | |
600 | ||
601 | gig_dbg(DEBUG_INIT, "Shutdown of HLL done"); | |
602 | } | |
603 | ||
604 | /* | |
605 | * Called by the tty driver when the tty line is hung up. | |
606 | * Wait for I/O to driver to complete and unregister ISDN device. | |
607 | * This is already done by the close routine, so just call that. | |
608 | * Called from process context. | |
609 | */ | |
610 | static int gigaset_tty_hangup(struct tty_struct *tty) | |
611 | { | |
612 | gigaset_tty_close(tty); | |
613 | return 0; | |
614 | } | |
615 | ||
616 | /* | |
617 | * Read on the tty. | |
618 | * Unused, received data goes only to the Gigaset driver. | |
619 | */ | |
620 | static ssize_t | |
621 | gigaset_tty_read(struct tty_struct *tty, struct file *file, | |
622 | unsigned char __user *buf, size_t count) | |
623 | { | |
624 | return -EAGAIN; | |
625 | } | |
626 | ||
627 | /* | |
628 | * Write on the tty. | |
629 | * Unused, transmit data comes only from the Gigaset driver. | |
630 | */ | |
631 | static ssize_t | |
632 | gigaset_tty_write(struct tty_struct *tty, struct file *file, | |
633 | const unsigned char *buf, size_t count) | |
634 | { | |
635 | return -EAGAIN; | |
636 | } | |
637 | ||
638 | /* | |
639 | * Ioctl on the tty. | |
640 | * Called in process context only. | |
641 | * May be re-entered by multiple ioctl calling threads. | |
642 | */ | |
643 | static int | |
644 | gigaset_tty_ioctl(struct tty_struct *tty, struct file *file, | |
645 | unsigned int cmd, unsigned long arg) | |
646 | { | |
647 | struct cardstate *cs = cs_get(tty); | |
648 | int rc, val; | |
649 | int __user *p = (int __user *)arg; | |
650 | ||
651 | if (!cs) | |
652 | return -ENXIO; | |
653 | ||
654 | switch (cmd) { | |
ea1afd25 AC |
655 | |
656 | case FIONREAD: | |
657 | /* unused, always return zero */ | |
658 | val = 0; | |
659 | rc = put_user(val, p); | |
2869b23e TS |
660 | break; |
661 | ||
662 | case TCFLSH: | |
663 | /* flush our buffers and the serial port's buffer */ | |
664 | switch (arg) { | |
665 | case TCIFLUSH: | |
666 | /* no own input buffer to flush */ | |
667 | break; | |
668 | case TCIOFLUSH: | |
669 | case TCOFLUSH: | |
670 | flush_send_queue(cs); | |
671 | break; | |
672 | } | |
ea1afd25 | 673 | /* Pass through */ |
2869b23e TS |
674 | |
675 | default: | |
ea1afd25 AC |
676 | /* pass through to underlying serial device */ |
677 | rc = n_tty_ioctl_helper(tty, file, cmd, arg); | |
678 | break; | |
2869b23e | 679 | } |
2869b23e TS |
680 | cs_put(cs); |
681 | return rc; | |
682 | } | |
683 | ||
2869b23e TS |
684 | /* |
685 | * Called by the tty driver when a block of data has been received. | |
686 | * Will not be re-entered while running but other ldisc functions | |
687 | * may be called in parallel. | |
688 | * Can be called from hard interrupt level as well as soft interrupt | |
689 | * level or mainline. | |
690 | * Parameters: | |
691 | * tty tty structure | |
692 | * buf buffer containing received characters | |
693 | * cflags buffer containing error flags for received characters (ignored) | |
694 | * count number of received characters | |
695 | */ | |
696 | static void | |
697 | gigaset_tty_receive(struct tty_struct *tty, const unsigned char *buf, | |
698 | char *cflags, int count) | |
699 | { | |
700 | struct cardstate *cs = cs_get(tty); | |
701 | unsigned tail, head, n; | |
702 | struct inbuf_t *inbuf; | |
703 | ||
704 | if (!cs) | |
705 | return; | |
ae67d7d8 TS |
706 | inbuf = cs->inbuf; |
707 | if (!inbuf) { | |
2869b23e TS |
708 | dev_err(cs->dev, "%s: no inbuf\n", __func__); |
709 | cs_put(cs); | |
710 | return; | |
711 | } | |
712 | ||
9d4bee2b TS |
713 | tail = inbuf->tail; |
714 | head = inbuf->head; | |
2869b23e TS |
715 | gig_dbg(DEBUG_INTR, "buffer state: %u -> %u, receive %u bytes", |
716 | head, tail, count); | |
717 | ||
718 | if (head <= tail) { | |
719 | /* possible buffer wraparound */ | |
720 | n = min_t(unsigned, count, RBUFSIZE - tail); | |
721 | memcpy(inbuf->data + tail, buf, n); | |
722 | tail = (tail + n) % RBUFSIZE; | |
723 | buf += n; | |
724 | count -= n; | |
725 | } | |
726 | ||
727 | if (count > 0) { | |
728 | /* tail < head and some data left */ | |
729 | n = head - tail - 1; | |
730 | if (count > n) { | |
731 | dev_err(cs->dev, | |
732 | "inbuf overflow, discarding %d bytes\n", | |
733 | count - n); | |
734 | count = n; | |
735 | } | |
736 | memcpy(inbuf->data + tail, buf, count); | |
737 | tail += count; | |
738 | } | |
739 | ||
740 | gig_dbg(DEBUG_INTR, "setting tail to %u", tail); | |
9d4bee2b | 741 | inbuf->tail = tail; |
2869b23e TS |
742 | |
743 | /* Everything was received .. Push data into handler */ | |
744 | gig_dbg(DEBUG_INTR, "%s-->BH", __func__); | |
745 | gigaset_schedule_event(cs); | |
746 | cs_put(cs); | |
747 | } | |
748 | ||
749 | /* | |
750 | * Called by the tty driver when there's room for more data to send. | |
751 | */ | |
752 | static void | |
753 | gigaset_tty_wakeup(struct tty_struct *tty) | |
754 | { | |
755 | struct cardstate *cs = cs_get(tty); | |
756 | ||
757 | clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags); | |
758 | if (!cs) | |
759 | return; | |
760 | tasklet_schedule(&cs->write_tasklet); | |
761 | cs_put(cs); | |
762 | } | |
763 | ||
a352def2 | 764 | static struct tty_ldisc_ops gigaset_ldisc = { |
2869b23e TS |
765 | .owner = THIS_MODULE, |
766 | .magic = TTY_LDISC_MAGIC, | |
767 | .name = "ser_gigaset", | |
768 | .open = gigaset_tty_open, | |
769 | .close = gigaset_tty_close, | |
770 | .hangup = gigaset_tty_hangup, | |
771 | .read = gigaset_tty_read, | |
772 | .write = gigaset_tty_write, | |
773 | .ioctl = gigaset_tty_ioctl, | |
2869b23e TS |
774 | .receive_buf = gigaset_tty_receive, |
775 | .write_wakeup = gigaset_tty_wakeup, | |
776 | }; | |
777 | ||
778 | ||
779 | /* Initialization / Shutdown */ | |
780 | /* ========================= */ | |
781 | ||
782 | static int __init ser_gigaset_init(void) | |
783 | { | |
784 | int rc; | |
785 | ||
786 | gig_dbg(DEBUG_INIT, "%s", __func__); | |
ae67d7d8 TS |
787 | rc = platform_driver_register(&device_driver); |
788 | if (rc != 0) { | |
c8770dca | 789 | pr_err("error %d registering platform driver\n", rc); |
2869b23e TS |
790 | return rc; |
791 | } | |
792 | ||
793 | /* allocate memory for our driver state and intialize it */ | |
ae67d7d8 | 794 | driver = gigaset_initdriver(GIGASET_MINOR, GIGASET_MINORS, |
2869b23e | 795 | GIGASET_MODULENAME, GIGASET_DEVNAME, |
ae67d7d8 TS |
796 | &ops, THIS_MODULE); |
797 | if (!driver) | |
2869b23e TS |
798 | goto error; |
799 | ||
ae67d7d8 TS |
800 | rc = tty_register_ldisc(N_GIGASET_M101, &gigaset_ldisc); |
801 | if (rc != 0) { | |
c8770dca | 802 | pr_err("error %d registering line discipline\n", rc); |
2869b23e TS |
803 | goto error; |
804 | } | |
805 | ||
806 | return 0; | |
807 | ||
808 | error: | |
809 | if (driver) { | |
810 | gigaset_freedriver(driver); | |
811 | driver = NULL; | |
812 | } | |
813 | platform_driver_unregister(&device_driver); | |
814 | return rc; | |
815 | } | |
816 | ||
817 | static void __exit ser_gigaset_exit(void) | |
818 | { | |
819 | int rc; | |
820 | ||
821 | gig_dbg(DEBUG_INIT, "%s", __func__); | |
822 | ||
823 | if (driver) { | |
824 | gigaset_freedriver(driver); | |
825 | driver = NULL; | |
826 | } | |
827 | ||
ae67d7d8 TS |
828 | rc = tty_unregister_ldisc(N_GIGASET_M101); |
829 | if (rc != 0) | |
c8770dca | 830 | pr_err("error %d unregistering line discipline\n", rc); |
2869b23e TS |
831 | |
832 | platform_driver_unregister(&device_driver); | |
833 | } | |
834 | ||
835 | module_init(ser_gigaset_init); | |
836 | module_exit(ser_gigaset_exit); |