Commit | Line | Data |
---|---|---|
165dc591 | 1 | /* |
e99525f9 | 2 | * Copyright (C) 2000 - 2007 Jeff Dike (jdike@{linux.intel,addtoit}.com) |
1da177e4 LT |
3 | * Licensed under the GPL |
4 | */ | |
5 | ||
1da177e4 LT |
6 | #include <linux/slab.h> |
7 | #include <linux/tty.h> | |
1da177e4 | 8 | #include <linux/tty_flip.h> |
1da177e4 | 9 | #include "chan_kern.h" |
1da177e4 LT |
10 | #include "os.h" |
11 | ||
fac97ae0 | 12 | #ifdef CONFIG_NOCONFIG_CHAN |
f28169d2 JD |
13 | static void *not_configged_init(char *str, int device, |
14 | const struct chan_opts *opts) | |
fac97ae0 | 15 | { |
e99525f9 | 16 | printk(KERN_ERR "Using a channel type which is configured out of " |
1da177e4 | 17 | "UML\n"); |
d50084a2 | 18 | return NULL; |
1da177e4 LT |
19 | } |
20 | ||
21 | static int not_configged_open(int input, int output, int primary, void *data, | |
22 | char **dev_out) | |
23 | { | |
e99525f9 | 24 | printk(KERN_ERR "Using a channel type which is configured out of " |
1da177e4 | 25 | "UML\n"); |
d50084a2 | 26 | return -ENODEV; |
1da177e4 LT |
27 | } |
28 | ||
29 | static void not_configged_close(int fd, void *data) | |
30 | { | |
e99525f9 | 31 | printk(KERN_ERR "Using a channel type which is configured out of " |
1da177e4 LT |
32 | "UML\n"); |
33 | } | |
34 | ||
35 | static int not_configged_read(int fd, char *c_out, void *data) | |
36 | { | |
e99525f9 | 37 | printk(KERN_ERR "Using a channel type which is configured out of " |
1da177e4 | 38 | "UML\n"); |
d50084a2 | 39 | return -EIO; |
1da177e4 LT |
40 | } |
41 | ||
42 | static int not_configged_write(int fd, const char *buf, int len, void *data) | |
43 | { | |
e99525f9 | 44 | printk(KERN_ERR "Using a channel type which is configured out of " |
1da177e4 | 45 | "UML\n"); |
d50084a2 | 46 | return -EIO; |
1da177e4 LT |
47 | } |
48 | ||
55c033c1 | 49 | static int not_configged_console_write(int fd, const char *buf, int len) |
1da177e4 | 50 | { |
e99525f9 | 51 | printk(KERN_ERR "Using a channel type which is configured out of " |
1da177e4 | 52 | "UML\n"); |
d50084a2 | 53 | return -EIO; |
1da177e4 LT |
54 | } |
55 | ||
56 | static int not_configged_window_size(int fd, void *data, unsigned short *rows, | |
57 | unsigned short *cols) | |
58 | { | |
e99525f9 | 59 | printk(KERN_ERR "Using a channel type which is configured out of " |
1da177e4 | 60 | "UML\n"); |
d50084a2 | 61 | return -ENODEV; |
1da177e4 LT |
62 | } |
63 | ||
64 | static void not_configged_free(void *data) | |
65 | { | |
e99525f9 | 66 | printk(KERN_ERR "Using a channel type which is configured out of " |
1da177e4 LT |
67 | "UML\n"); |
68 | } | |
69 | ||
5e7672ec | 70 | static const struct chan_ops not_configged_ops = { |
1da177e4 LT |
71 | .init = not_configged_init, |
72 | .open = not_configged_open, | |
73 | .close = not_configged_close, | |
74 | .read = not_configged_read, | |
75 | .write = not_configged_write, | |
76 | .console_write = not_configged_console_write, | |
77 | .window_size = not_configged_window_size, | |
78 | .free = not_configged_free, | |
79 | .winch = 0, | |
80 | }; | |
81 | #endif /* CONFIG_NOCONFIG_CHAN */ | |
82 | ||
1da177e4 LT |
83 | static void tty_receive_char(struct tty_struct *tty, char ch) |
84 | { | |
e99525f9 JD |
85 | if (tty == NULL) |
86 | return; | |
1da177e4 | 87 | |
e99525f9 JD |
88 | if (I_IXON(tty) && !I_IXOFF(tty) && !tty->raw) { |
89 | if (ch == STOP_CHAR(tty)) { | |
1da177e4 LT |
90 | stop_tty(tty); |
91 | return; | |
92 | } | |
e99525f9 | 93 | else if (ch == START_CHAR(tty)) { |
1da177e4 LT |
94 | start_tty(tty); |
95 | return; | |
96 | } | |
97 | } | |
98 | ||
1da177e4 LT |
99 | tty_insert_flip_char(tty, ch, TTY_NORMAL); |
100 | } | |
101 | ||
d50084a2 | 102 | static int open_one_chan(struct chan *chan) |
1da177e4 | 103 | { |
6676ae62 | 104 | int fd, err; |
1da177e4 | 105 | |
e99525f9 | 106 | if (chan->opened) |
d50084a2 JD |
107 | return 0; |
108 | ||
e99525f9 | 109 | if (chan->ops->open == NULL) |
d50084a2 JD |
110 | fd = 0; |
111 | else fd = (*chan->ops->open)(chan->input, chan->output, chan->primary, | |
112 | chan->data, &chan->dev); | |
e99525f9 | 113 | if (fd < 0) |
d50084a2 | 114 | return fd; |
6676ae62 JD |
115 | |
116 | err = os_set_fd_block(fd, 0); | |
117 | if (err) { | |
118 | (*chan->ops->close)(fd, chan->data); | |
119 | return err; | |
120 | } | |
121 | ||
1da177e4 LT |
122 | chan->fd = fd; |
123 | ||
124 | chan->opened = 1; | |
d50084a2 | 125 | return 0; |
1da177e4 LT |
126 | } |
127 | ||
3af7cb7b | 128 | static int open_chan(struct list_head *chans) |
1da177e4 LT |
129 | { |
130 | struct list_head *ele; | |
131 | struct chan *chan; | |
132 | int ret, err = 0; | |
133 | ||
e99525f9 | 134 | list_for_each(ele, chans) { |
1da177e4 | 135 | chan = list_entry(ele, struct chan, list); |
d50084a2 | 136 | ret = open_one_chan(chan); |
e99525f9 | 137 | if (chan->primary) |
d50084a2 | 138 | err = ret; |
1da177e4 | 139 | } |
d50084a2 | 140 | return err; |
1da177e4 LT |
141 | } |
142 | ||
143 | void chan_enable_winch(struct list_head *chans, struct tty_struct *tty) | |
144 | { | |
145 | struct list_head *ele; | |
146 | struct chan *chan; | |
147 | ||
e99525f9 | 148 | list_for_each(ele, chans) { |
1da177e4 | 149 | chan = list_entry(ele, struct chan, list); |
e99525f9 | 150 | if (chan->primary && chan->output && chan->ops->winch) { |
1da177e4 LT |
151 | register_winch(chan->fd, tty); |
152 | return; | |
153 | } | |
154 | } | |
155 | } | |
156 | ||
d14ad81f | 157 | int enable_chan(struct line *line) |
1da177e4 LT |
158 | { |
159 | struct list_head *ele; | |
160 | struct chan *chan; | |
d14ad81f | 161 | int err; |
1da177e4 | 162 | |
e99525f9 | 163 | list_for_each(ele, &line->chan_list) { |
1da177e4 | 164 | chan = list_entry(ele, struct chan, list); |
d14ad81f JD |
165 | err = open_one_chan(chan); |
166 | if (err) { | |
167 | if (chan->primary) | |
168 | goto out_close; | |
169 | ||
165dc591 | 170 | continue; |
d14ad81f | 171 | } |
165dc591 | 172 | |
e99525f9 | 173 | if (chan->enabled) |
165dc591 | 174 | continue; |
d14ad81f JD |
175 | err = line_setup_irq(chan->fd, chan->input, chan->output, line, |
176 | chan); | |
177 | if (err) | |
178 | goto out_close; | |
179 | ||
165dc591 JD |
180 | chan->enabled = 1; |
181 | } | |
d14ad81f JD |
182 | |
183 | return 0; | |
184 | ||
185 | out_close: | |
186 | close_chan(&line->chan_list, 0); | |
187 | return err; | |
165dc591 JD |
188 | } |
189 | ||
190c3e45 JD |
190 | /* Items are added in IRQ context, when free_irq can't be called, and |
191 | * removed in process context, when it can. | |
192 | * This handles interrupt sources which disappear, and which need to | |
193 | * be permanently disabled. This is discovered in IRQ context, but | |
194 | * the freeing of the IRQ must be done later. | |
195 | */ | |
196 | static DEFINE_SPINLOCK(irqs_to_free_lock); | |
165dc591 JD |
197 | static LIST_HEAD(irqs_to_free); |
198 | ||
199 | void free_irqs(void) | |
200 | { | |
201 | struct chan *chan; | |
190c3e45 JD |
202 | LIST_HEAD(list); |
203 | struct list_head *ele; | |
3076212f | 204 | unsigned long flags; |
190c3e45 | 205 | |
3076212f | 206 | spin_lock_irqsave(&irqs_to_free_lock, flags); |
190c3e45 | 207 | list_splice_init(&irqs_to_free, &list); |
3076212f | 208 | spin_unlock_irqrestore(&irqs_to_free_lock, flags); |
165dc591 | 209 | |
e99525f9 | 210 | list_for_each(ele, &list) { |
190c3e45 | 211 | chan = list_entry(ele, struct chan, free_list); |
165dc591 | 212 | |
e99525f9 | 213 | if (chan->input) |
165dc591 | 214 | free_irq(chan->line->driver->read_irq, chan); |
e99525f9 | 215 | if (chan->output) |
165dc591 JD |
216 | free_irq(chan->line->driver->write_irq, chan); |
217 | chan->enabled = 0; | |
218 | } | |
219 | } | |
220 | ||
221 | static void close_one_chan(struct chan *chan, int delay_free_irq) | |
222 | { | |
3076212f JD |
223 | unsigned long flags; |
224 | ||
e99525f9 | 225 | if (!chan->opened) |
165dc591 | 226 | return; |
1da177e4 | 227 | |
e99525f9 | 228 | if (delay_free_irq) { |
3076212f | 229 | spin_lock_irqsave(&irqs_to_free_lock, flags); |
165dc591 | 230 | list_add(&chan->free_list, &irqs_to_free); |
3076212f | 231 | spin_unlock_irqrestore(&irqs_to_free_lock, flags); |
165dc591 JD |
232 | } |
233 | else { | |
e99525f9 | 234 | if (chan->input) |
165dc591 | 235 | free_irq(chan->line->driver->read_irq, chan); |
e99525f9 | 236 | if (chan->output) |
165dc591 JD |
237 | free_irq(chan->line->driver->write_irq, chan); |
238 | chan->enabled = 0; | |
1da177e4 | 239 | } |
e99525f9 | 240 | if (chan->ops->close != NULL) |
165dc591 JD |
241 | (*chan->ops->close)(chan->fd, chan->data); |
242 | ||
243 | chan->opened = 0; | |
244 | chan->fd = -1; | |
1da177e4 LT |
245 | } |
246 | ||
165dc591 | 247 | void close_chan(struct list_head *chans, int delay_free_irq) |
1da177e4 LT |
248 | { |
249 | struct chan *chan; | |
250 | ||
251 | /* Close in reverse order as open in case more than one of them | |
252 | * refers to the same device and they save and restore that device's | |
253 | * state. Then, the first one opened will have the original state, | |
254 | * so it must be the last closed. | |
255 | */ | |
256 | list_for_each_entry_reverse(chan, chans, list) { | |
165dc591 | 257 | close_one_chan(chan, delay_free_irq); |
1da177e4 LT |
258 | } |
259 | } | |
260 | ||
e4dcee80 JD |
261 | void deactivate_chan(struct list_head *chans, int irq) |
262 | { | |
263 | struct list_head *ele; | |
264 | ||
265 | struct chan *chan; | |
266 | list_for_each(ele, chans) { | |
267 | chan = list_entry(ele, struct chan, list); | |
268 | ||
e99525f9 | 269 | if (chan->enabled && chan->input) |
e4dcee80 JD |
270 | deactivate_fd(chan->fd, irq); |
271 | } | |
272 | } | |
273 | ||
274 | void reactivate_chan(struct list_head *chans, int irq) | |
275 | { | |
276 | struct list_head *ele; | |
277 | struct chan *chan; | |
278 | ||
279 | list_for_each(ele, chans) { | |
280 | chan = list_entry(ele, struct chan, list); | |
281 | ||
e99525f9 | 282 | if (chan->enabled && chan->input) |
e4dcee80 JD |
283 | reactivate_fd(chan->fd, irq); |
284 | } | |
285 | } | |
286 | ||
d50084a2 | 287 | int write_chan(struct list_head *chans, const char *buf, int len, |
1da177e4 LT |
288 | int write_irq) |
289 | { | |
290 | struct list_head *ele; | |
291 | struct chan *chan = NULL; | |
292 | int n, ret = 0; | |
293 | ||
c59dbcad JD |
294 | if (len == 0) |
295 | return 0; | |
296 | ||
1da177e4 LT |
297 | list_for_each(ele, chans) { |
298 | chan = list_entry(ele, struct chan, list); | |
299 | if (!chan->output || (chan->ops->write == NULL)) | |
300 | continue; | |
e99525f9 | 301 | |
1da177e4 LT |
302 | n = chan->ops->write(chan->fd, buf, len, chan->data); |
303 | if (chan->primary) { | |
304 | ret = n; | |
305 | if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len))) | |
306 | reactivate_fd(chan->fd, write_irq); | |
307 | } | |
308 | } | |
d50084a2 | 309 | return ret; |
1da177e4 LT |
310 | } |
311 | ||
312 | int console_write_chan(struct list_head *chans, const char *buf, int len) | |
313 | { | |
314 | struct list_head *ele; | |
315 | struct chan *chan; | |
316 | int n, ret = 0; | |
317 | ||
e99525f9 | 318 | list_for_each(ele, chans) { |
1da177e4 | 319 | chan = list_entry(ele, struct chan, list); |
e99525f9 | 320 | if (!chan->output || (chan->ops->console_write == NULL)) |
1da177e4 | 321 | continue; |
e99525f9 | 322 | |
55c033c1 | 323 | n = chan->ops->console_write(chan->fd, buf, len); |
e99525f9 JD |
324 | if (chan->primary) |
325 | ret = n; | |
1da177e4 | 326 | } |
d50084a2 | 327 | return ret; |
1da177e4 LT |
328 | } |
329 | ||
a52f362f | 330 | int console_open_chan(struct line *line, struct console *co) |
1da177e4 | 331 | { |
1f80171e JD |
332 | int err; |
333 | ||
334 | err = open_chan(&line->chan_list); | |
e99525f9 | 335 | if (err) |
1f80171e | 336 | return err; |
1da177e4 | 337 | |
e99525f9 JD |
338 | printk(KERN_INFO "Console initialized on /dev/%s%d\n", co->name, |
339 | co->index); | |
1da177e4 LT |
340 | return 0; |
341 | } | |
342 | ||
343 | int chan_window_size(struct list_head *chans, unsigned short *rows_out, | |
344 | unsigned short *cols_out) | |
345 | { | |
346 | struct list_head *ele; | |
347 | struct chan *chan; | |
348 | ||
e99525f9 | 349 | list_for_each(ele, chans) { |
1da177e4 | 350 | chan = list_entry(ele, struct chan, list); |
e99525f9 JD |
351 | if (chan->primary) { |
352 | if (chan->ops->window_size == NULL) | |
d50084a2 JD |
353 | return 0; |
354 | return chan->ops->window_size(chan->fd, chan->data, | |
355 | rows_out, cols_out); | |
1da177e4 LT |
356 | } |
357 | } | |
d50084a2 | 358 | return 0; |
1da177e4 LT |
359 | } |
360 | ||
42947cb9 | 361 | static void free_one_chan(struct chan *chan, int delay_free_irq) |
1da177e4 LT |
362 | { |
363 | list_del(&chan->list); | |
165dc591 JD |
364 | |
365 | close_one_chan(chan, delay_free_irq); | |
366 | ||
e99525f9 | 367 | if (chan->ops->free != NULL) |
1da177e4 | 368 | (*chan->ops->free)(chan->data); |
165dc591 | 369 | |
e99525f9 JD |
370 | if (chan->primary && chan->output) |
371 | ignore_sigio_fd(chan->fd); | |
1da177e4 LT |
372 | kfree(chan); |
373 | } | |
374 | ||
42947cb9 | 375 | static void free_chan(struct list_head *chans, int delay_free_irq) |
1da177e4 LT |
376 | { |
377 | struct list_head *ele, *next; | |
378 | struct chan *chan; | |
379 | ||
e99525f9 | 380 | list_for_each_safe(ele, next, chans) { |
1da177e4 | 381 | chan = list_entry(ele, struct chan, list); |
165dc591 | 382 | free_one_chan(chan, delay_free_irq); |
1da177e4 LT |
383 | } |
384 | } | |
385 | ||
386 | static int one_chan_config_string(struct chan *chan, char *str, int size, | |
387 | char **error_out) | |
388 | { | |
389 | int n = 0; | |
390 | ||
e99525f9 | 391 | if (chan == NULL) { |
1da177e4 | 392 | CONFIG_CHUNK(str, size, n, "none", 1); |
d50084a2 | 393 | return n; |
1da177e4 LT |
394 | } |
395 | ||
396 | CONFIG_CHUNK(str, size, n, chan->ops->type, 0); | |
397 | ||
e99525f9 | 398 | if (chan->dev == NULL) { |
1da177e4 | 399 | CONFIG_CHUNK(str, size, n, "", 1); |
d50084a2 | 400 | return n; |
1da177e4 LT |
401 | } |
402 | ||
403 | CONFIG_CHUNK(str, size, n, ":", 0); | |
404 | CONFIG_CHUNK(str, size, n, chan->dev, 0); | |
405 | ||
d50084a2 | 406 | return n; |
1da177e4 LT |
407 | } |
408 | ||
d50084a2 | 409 | static int chan_pair_config_string(struct chan *in, struct chan *out, |
1da177e4 LT |
410 | char *str, int size, char **error_out) |
411 | { | |
412 | int n; | |
413 | ||
414 | n = one_chan_config_string(in, str, size, error_out); | |
415 | str += n; | |
416 | size -= n; | |
417 | ||
e99525f9 | 418 | if (in == out) { |
1da177e4 | 419 | CONFIG_CHUNK(str, size, n, "", 1); |
d50084a2 | 420 | return n; |
1da177e4 LT |
421 | } |
422 | ||
423 | CONFIG_CHUNK(str, size, n, ",", 1); | |
424 | n = one_chan_config_string(out, str, size, error_out); | |
425 | str += n; | |
426 | size -= n; | |
427 | CONFIG_CHUNK(str, size, n, "", 1); | |
428 | ||
d50084a2 | 429 | return n; |
1da177e4 LT |
430 | } |
431 | ||
d50084a2 | 432 | int chan_config_string(struct list_head *chans, char *str, int size, |
1da177e4 LT |
433 | char **error_out) |
434 | { | |
435 | struct list_head *ele; | |
436 | struct chan *chan, *in = NULL, *out = NULL; | |
437 | ||
e99525f9 | 438 | list_for_each(ele, chans) { |
1da177e4 | 439 | chan = list_entry(ele, struct chan, list); |
e99525f9 | 440 | if (!chan->primary) |
1da177e4 | 441 | continue; |
e99525f9 | 442 | if (chan->input) |
1da177e4 | 443 | in = chan; |
e99525f9 | 444 | if (chan->output) |
1da177e4 LT |
445 | out = chan; |
446 | } | |
447 | ||
d50084a2 | 448 | return chan_pair_config_string(in, out, str, size, error_out); |
1da177e4 LT |
449 | } |
450 | ||
451 | struct chan_type { | |
452 | char *key; | |
5e7672ec | 453 | const struct chan_ops *ops; |
1da177e4 LT |
454 | }; |
455 | ||
5e7672ec | 456 | static const struct chan_type chan_table[] = { |
1da177e4 LT |
457 | { "fd", &fd_ops }, |
458 | ||
459 | #ifdef CONFIG_NULL_CHAN | |
460 | { "null", &null_ops }, | |
461 | #else | |
462 | { "null", ¬_configged_ops }, | |
463 | #endif | |
464 | ||
465 | #ifdef CONFIG_PORT_CHAN | |
466 | { "port", &port_ops }, | |
467 | #else | |
468 | { "port", ¬_configged_ops }, | |
469 | #endif | |
470 | ||
471 | #ifdef CONFIG_PTY_CHAN | |
472 | { "pty", &pty_ops }, | |
473 | { "pts", &pts_ops }, | |
474 | #else | |
475 | { "pty", ¬_configged_ops }, | |
476 | { "pts", ¬_configged_ops }, | |
477 | #endif | |
478 | ||
479 | #ifdef CONFIG_TTY_CHAN | |
480 | { "tty", &tty_ops }, | |
481 | #else | |
482 | { "tty", ¬_configged_ops }, | |
483 | #endif | |
484 | ||
485 | #ifdef CONFIG_XTERM_CHAN | |
486 | { "xterm", &xterm_ops }, | |
487 | #else | |
488 | { "xterm", ¬_configged_ops }, | |
489 | #endif | |
490 | }; | |
491 | ||
165dc591 | 492 | static struct chan *parse_chan(struct line *line, char *str, int device, |
f28169d2 | 493 | const struct chan_opts *opts, char **error_out) |
1da177e4 | 494 | { |
5e7672ec JD |
495 | const struct chan_type *entry; |
496 | const struct chan_ops *ops; | |
1da177e4 LT |
497 | struct chan *chan; |
498 | void *data; | |
499 | int i; | |
500 | ||
501 | ops = NULL; | |
502 | data = NULL; | |
e99525f9 | 503 | for(i = 0; i < ARRAY_SIZE(chan_table); i++) { |
1da177e4 | 504 | entry = &chan_table[i]; |
e99525f9 | 505 | if (!strncmp(str, entry->key, strlen(entry->key))) { |
1da177e4 LT |
506 | ops = entry->ops; |
507 | str += strlen(entry->key); | |
508 | break; | |
509 | } | |
510 | } | |
e99525f9 | 511 | if (ops == NULL) { |
f28169d2 | 512 | *error_out = "No match for configured backends"; |
d50084a2 | 513 | return NULL; |
1da177e4 | 514 | } |
f28169d2 | 515 | |
1da177e4 | 516 | data = (*ops->init)(str, device, opts); |
e99525f9 | 517 | if (data == NULL) { |
f28169d2 | 518 | *error_out = "Configuration failed"; |
d50084a2 | 519 | return NULL; |
f28169d2 | 520 | } |
1da177e4 | 521 | |
79ae2cb8 | 522 | chan = kmalloc(sizeof(*chan), GFP_ATOMIC); |
e99525f9 | 523 | if (chan == NULL) { |
f28169d2 | 524 | *error_out = "Memory allocation failed"; |
d50084a2 | 525 | return NULL; |
f28169d2 | 526 | } |
1da177e4 | 527 | *chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list), |
165dc591 JD |
528 | .free_list = |
529 | LIST_HEAD_INIT(chan->free_list), | |
530 | .line = line, | |
1da177e4 LT |
531 | .primary = 1, |
532 | .input = 0, | |
533 | .output = 0, | |
534 | .opened = 0, | |
165dc591 | 535 | .enabled = 0, |
1da177e4 | 536 | .fd = -1, |
1da177e4 LT |
537 | .ops = ops, |
538 | .data = data }); | |
d50084a2 | 539 | return chan; |
1da177e4 LT |
540 | } |
541 | ||
165dc591 | 542 | int parse_chan_pair(char *str, struct line *line, int device, |
f28169d2 | 543 | const struct chan_opts *opts, char **error_out) |
1da177e4 | 544 | { |
165dc591 | 545 | struct list_head *chans = &line->chan_list; |
1da177e4 LT |
546 | struct chan *new, *chan; |
547 | char *in, *out; | |
548 | ||
e99525f9 | 549 | if (!list_empty(chans)) { |
1da177e4 | 550 | chan = list_entry(chans->next, struct chan, list); |
165dc591 | 551 | free_chan(chans, 0); |
1da177e4 LT |
552 | INIT_LIST_HEAD(chans); |
553 | } | |
554 | ||
555 | out = strchr(str, ','); | |
e99525f9 | 556 | if (out != NULL) { |
1da177e4 LT |
557 | in = str; |
558 | *out = '\0'; | |
559 | out++; | |
f28169d2 | 560 | new = parse_chan(line, in, device, opts, error_out); |
e99525f9 | 561 | if (new == NULL) |
d50084a2 JD |
562 | return -1; |
563 | ||
1da177e4 LT |
564 | new->input = 1; |
565 | list_add(&new->list, chans); | |
566 | ||
f28169d2 | 567 | new = parse_chan(line, out, device, opts, error_out); |
e99525f9 | 568 | if (new == NULL) |
d50084a2 JD |
569 | return -1; |
570 | ||
1da177e4 LT |
571 | list_add(&new->list, chans); |
572 | new->output = 1; | |
573 | } | |
574 | else { | |
f28169d2 | 575 | new = parse_chan(line, str, device, opts, error_out); |
e99525f9 | 576 | if (new == NULL) |
d50084a2 JD |
577 | return -1; |
578 | ||
1da177e4 LT |
579 | list_add(&new->list, chans); |
580 | new->input = 1; | |
581 | new->output = 1; | |
582 | } | |
d50084a2 | 583 | return 0; |
1da177e4 LT |
584 | } |
585 | ||
6d5aefb8 | 586 | void chan_interrupt(struct list_head *chans, struct delayed_work *task, |
1da177e4 LT |
587 | struct tty_struct *tty, int irq) |
588 | { | |
589 | struct list_head *ele, *next; | |
590 | struct chan *chan; | |
591 | int err; | |
592 | char c; | |
593 | ||
e99525f9 | 594 | list_for_each_safe(ele, next, chans) { |
1da177e4 | 595 | chan = list_entry(ele, struct chan, list); |
e99525f9 JD |
596 | if (!chan->input || (chan->ops->read == NULL)) |
597 | continue; | |
1da177e4 | 598 | do { |
33f0f88f | 599 | if (tty && !tty_buffer_request_room(tty, 1)) { |
9159c9df | 600 | schedule_delayed_work(task, 1); |
1da177e4 LT |
601 | goto out; |
602 | } | |
603 | err = chan->ops->read(chan->fd, &c, chan->data); | |
e99525f9 | 604 | if (err > 0) |
1da177e4 | 605 | tty_receive_char(tty, c); |
e99525f9 | 606 | } while (err > 0); |
1da177e4 | 607 | |
e99525f9 JD |
608 | if (err == 0) |
609 | reactivate_fd(chan->fd, irq); | |
610 | if (err == -EIO) { | |
611 | if (chan->primary) { | |
612 | if (tty != NULL) | |
1da177e4 | 613 | tty_hangup(tty); |
165dc591 | 614 | close_chan(chans, 1); |
1da177e4 LT |
615 | return; |
616 | } | |
165dc591 | 617 | else close_one_chan(chan, 1); |
1da177e4 LT |
618 | } |
619 | } | |
620 | out: | |
e99525f9 JD |
621 | if (tty) |
622 | tty_flip_buffer_push(tty); | |
1da177e4 | 623 | } |