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Commit | Line | Data |
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165dc591 | 1 | /* |
1da177e4 LT |
2 | * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com) |
3 | * Licensed under the GPL | |
4 | */ | |
5 | ||
6 | #include <linux/stddef.h> | |
7 | #include <linux/kernel.h> | |
8 | #include <linux/list.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/tty.h> | |
11 | #include <linux/string.h> | |
12 | #include <linux/tty_flip.h> | |
13 | #include <asm/irq.h> | |
14 | #include "chan_kern.h" | |
15 | #include "user_util.h" | |
16 | #include "kern.h" | |
17 | #include "irq_user.h" | |
18 | #include "sigio.h" | |
19 | #include "line.h" | |
20 | #include "os.h" | |
21 | ||
fac97ae0 | 22 | #ifdef CONFIG_NOCONFIG_CHAN |
f28169d2 JD |
23 | static void *not_configged_init(char *str, int device, |
24 | const struct chan_opts *opts) | |
fac97ae0 | 25 | { |
f28169d2 | 26 | printk("Using a channel type which is configured out of " |
1da177e4 | 27 | "UML\n"); |
d50084a2 | 28 | return NULL; |
1da177e4 LT |
29 | } |
30 | ||
31 | static int not_configged_open(int input, int output, int primary, void *data, | |
32 | char **dev_out) | |
33 | { | |
f28169d2 | 34 | printk("Using a channel type which is configured out of " |
1da177e4 | 35 | "UML\n"); |
d50084a2 | 36 | return -ENODEV; |
1da177e4 LT |
37 | } |
38 | ||
39 | static void not_configged_close(int fd, void *data) | |
40 | { | |
f28169d2 | 41 | printk("Using a channel type which is configured out of " |
1da177e4 LT |
42 | "UML\n"); |
43 | } | |
44 | ||
45 | static int not_configged_read(int fd, char *c_out, void *data) | |
46 | { | |
f28169d2 | 47 | printk("Using a channel type which is configured out of " |
1da177e4 | 48 | "UML\n"); |
d50084a2 | 49 | return -EIO; |
1da177e4 LT |
50 | } |
51 | ||
52 | static int not_configged_write(int fd, const char *buf, int len, void *data) | |
53 | { | |
f28169d2 | 54 | printk("Using a channel type which is configured out of " |
1da177e4 | 55 | "UML\n"); |
d50084a2 | 56 | return -EIO; |
1da177e4 LT |
57 | } |
58 | ||
55c033c1 | 59 | static int not_configged_console_write(int fd, const char *buf, int len) |
1da177e4 | 60 | { |
f28169d2 | 61 | printk("Using a channel type which is configured out of " |
1da177e4 | 62 | "UML\n"); |
d50084a2 | 63 | return -EIO; |
1da177e4 LT |
64 | } |
65 | ||
66 | static int not_configged_window_size(int fd, void *data, unsigned short *rows, | |
67 | unsigned short *cols) | |
68 | { | |
f28169d2 | 69 | printk("Using a channel type which is configured out of " |
1da177e4 | 70 | "UML\n"); |
d50084a2 | 71 | return -ENODEV; |
1da177e4 LT |
72 | } |
73 | ||
74 | static void not_configged_free(void *data) | |
75 | { | |
f28169d2 | 76 | printk("Using a channel type which is configured out of " |
1da177e4 LT |
77 | "UML\n"); |
78 | } | |
79 | ||
5e7672ec | 80 | static const struct chan_ops not_configged_ops = { |
1da177e4 LT |
81 | .init = not_configged_init, |
82 | .open = not_configged_open, | |
83 | .close = not_configged_close, | |
84 | .read = not_configged_read, | |
85 | .write = not_configged_write, | |
86 | .console_write = not_configged_console_write, | |
87 | .window_size = not_configged_window_size, | |
88 | .free = not_configged_free, | |
89 | .winch = 0, | |
90 | }; | |
91 | #endif /* CONFIG_NOCONFIG_CHAN */ | |
92 | ||
93 | void generic_close(int fd, void *unused) | |
94 | { | |
95 | os_close_file(fd); | |
96 | } | |
97 | ||
98 | int generic_read(int fd, char *c_out, void *unused) | |
99 | { | |
100 | int n; | |
101 | ||
102 | n = os_read_file(fd, c_out, sizeof(*c_out)); | |
103 | ||
104 | if(n == -EAGAIN) | |
d50084a2 | 105 | return 0; |
1da177e4 | 106 | else if(n == 0) |
d50084a2 JD |
107 | return -EIO; |
108 | return n; | |
1da177e4 LT |
109 | } |
110 | ||
111 | /* XXX Trivial wrapper around os_write_file */ | |
112 | ||
113 | int generic_write(int fd, const char *buf, int n, void *unused) | |
114 | { | |
d50084a2 | 115 | return os_write_file(fd, buf, n); |
1da177e4 LT |
116 | } |
117 | ||
118 | int generic_window_size(int fd, void *unused, unsigned short *rows_out, | |
119 | unsigned short *cols_out) | |
120 | { | |
121 | int rows, cols; | |
122 | int ret; | |
123 | ||
124 | ret = os_window_size(fd, &rows, &cols); | |
125 | if(ret < 0) | |
d50084a2 | 126 | return ret; |
1da177e4 LT |
127 | |
128 | ret = ((*rows_out != rows) || (*cols_out != cols)); | |
129 | ||
130 | *rows_out = rows; | |
131 | *cols_out = cols; | |
132 | ||
d50084a2 | 133 | return ret; |
1da177e4 LT |
134 | } |
135 | ||
136 | void generic_free(void *data) | |
137 | { | |
138 | kfree(data); | |
139 | } | |
140 | ||
141 | static void tty_receive_char(struct tty_struct *tty, char ch) | |
142 | { | |
143 | if(tty == NULL) return; | |
144 | ||
145 | if(I_IXON(tty) && !I_IXOFF(tty) && !tty->raw) { | |
146 | if(ch == STOP_CHAR(tty)){ | |
147 | stop_tty(tty); | |
148 | return; | |
149 | } | |
150 | else if(ch == START_CHAR(tty)){ | |
151 | start_tty(tty); | |
152 | return; | |
153 | } | |
154 | } | |
155 | ||
1da177e4 LT |
156 | tty_insert_flip_char(tty, ch, TTY_NORMAL); |
157 | } | |
158 | ||
d50084a2 | 159 | static int open_one_chan(struct chan *chan) |
1da177e4 LT |
160 | { |
161 | int fd; | |
162 | ||
d50084a2 JD |
163 | if(chan->opened) |
164 | return 0; | |
165 | ||
166 | if(chan->ops->open == NULL) | |
167 | fd = 0; | |
168 | else fd = (*chan->ops->open)(chan->input, chan->output, chan->primary, | |
169 | chan->data, &chan->dev); | |
170 | if(fd < 0) | |
171 | return fd; | |
1da177e4 LT |
172 | chan->fd = fd; |
173 | ||
174 | chan->opened = 1; | |
d50084a2 | 175 | return 0; |
1da177e4 LT |
176 | } |
177 | ||
178 | int open_chan(struct list_head *chans) | |
179 | { | |
180 | struct list_head *ele; | |
181 | struct chan *chan; | |
182 | int ret, err = 0; | |
183 | ||
184 | list_for_each(ele, chans){ | |
185 | chan = list_entry(ele, struct chan, list); | |
d50084a2 JD |
186 | ret = open_one_chan(chan); |
187 | if(chan->primary) | |
188 | err = ret; | |
1da177e4 | 189 | } |
d50084a2 | 190 | return err; |
1da177e4 LT |
191 | } |
192 | ||
193 | void chan_enable_winch(struct list_head *chans, struct tty_struct *tty) | |
194 | { | |
195 | struct list_head *ele; | |
196 | struct chan *chan; | |
197 | ||
198 | list_for_each(ele, chans){ | |
199 | chan = list_entry(ele, struct chan, list); | |
200 | if(chan->primary && chan->output && chan->ops->winch){ | |
201 | register_winch(chan->fd, tty); | |
202 | return; | |
203 | } | |
204 | } | |
205 | } | |
206 | ||
165dc591 | 207 | void enable_chan(struct line *line) |
1da177e4 LT |
208 | { |
209 | struct list_head *ele; | |
210 | struct chan *chan; | |
211 | ||
165dc591 | 212 | list_for_each(ele, &line->chan_list){ |
1da177e4 | 213 | chan = list_entry(ele, struct chan, list); |
165dc591 JD |
214 | if(open_one_chan(chan)) |
215 | continue; | |
216 | ||
217 | if(chan->enabled) | |
218 | continue; | |
219 | line_setup_irq(chan->fd, chan->input, chan->output, line, | |
220 | chan); | |
221 | chan->enabled = 1; | |
222 | } | |
223 | } | |
224 | ||
225 | static LIST_HEAD(irqs_to_free); | |
226 | ||
227 | void free_irqs(void) | |
228 | { | |
229 | struct chan *chan; | |
230 | ||
231 | while(!list_empty(&irqs_to_free)){ | |
232 | chan = list_entry(irqs_to_free.next, struct chan, free_list); | |
233 | list_del(&chan->free_list); | |
234 | ||
235 | if(chan->input) | |
236 | free_irq(chan->line->driver->read_irq, chan); | |
237 | if(chan->output) | |
238 | free_irq(chan->line->driver->write_irq, chan); | |
239 | chan->enabled = 0; | |
240 | } | |
241 | } | |
242 | ||
243 | static void close_one_chan(struct chan *chan, int delay_free_irq) | |
244 | { | |
245 | if(!chan->opened) | |
246 | return; | |
1da177e4 | 247 | |
165dc591 JD |
248 | if(delay_free_irq){ |
249 | list_add(&chan->free_list, &irqs_to_free); | |
250 | } | |
251 | else { | |
252 | if(chan->input) | |
253 | free_irq(chan->line->driver->read_irq, chan); | |
254 | if(chan->output) | |
255 | free_irq(chan->line->driver->write_irq, chan); | |
256 | chan->enabled = 0; | |
1da177e4 | 257 | } |
165dc591 JD |
258 | if(chan->ops->close != NULL) |
259 | (*chan->ops->close)(chan->fd, chan->data); | |
260 | ||
261 | chan->opened = 0; | |
262 | chan->fd = -1; | |
1da177e4 LT |
263 | } |
264 | ||
165dc591 | 265 | void close_chan(struct list_head *chans, int delay_free_irq) |
1da177e4 LT |
266 | { |
267 | struct chan *chan; | |
268 | ||
269 | /* Close in reverse order as open in case more than one of them | |
270 | * refers to the same device and they save and restore that device's | |
271 | * state. Then, the first one opened will have the original state, | |
272 | * so it must be the last closed. | |
273 | */ | |
274 | list_for_each_entry_reverse(chan, chans, list) { | |
165dc591 | 275 | close_one_chan(chan, delay_free_irq); |
1da177e4 LT |
276 | } |
277 | } | |
278 | ||
e4dcee80 JD |
279 | void deactivate_chan(struct list_head *chans, int irq) |
280 | { | |
281 | struct list_head *ele; | |
282 | ||
283 | struct chan *chan; | |
284 | list_for_each(ele, chans) { | |
285 | chan = list_entry(ele, struct chan, list); | |
286 | ||
287 | if(chan->enabled && chan->input) | |
288 | deactivate_fd(chan->fd, irq); | |
289 | } | |
290 | } | |
291 | ||
292 | void reactivate_chan(struct list_head *chans, int irq) | |
293 | { | |
294 | struct list_head *ele; | |
295 | struct chan *chan; | |
296 | ||
297 | list_for_each(ele, chans) { | |
298 | chan = list_entry(ele, struct chan, list); | |
299 | ||
300 | if(chan->enabled && chan->input) | |
301 | reactivate_fd(chan->fd, irq); | |
302 | } | |
303 | } | |
304 | ||
d50084a2 | 305 | int write_chan(struct list_head *chans, const char *buf, int len, |
1da177e4 LT |
306 | int write_irq) |
307 | { | |
308 | struct list_head *ele; | |
309 | struct chan *chan = NULL; | |
310 | int n, ret = 0; | |
311 | ||
312 | list_for_each(ele, chans) { | |
313 | chan = list_entry(ele, struct chan, list); | |
314 | if (!chan->output || (chan->ops->write == NULL)) | |
315 | continue; | |
316 | n = chan->ops->write(chan->fd, buf, len, chan->data); | |
317 | if (chan->primary) { | |
318 | ret = n; | |
319 | if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len))) | |
320 | reactivate_fd(chan->fd, write_irq); | |
321 | } | |
322 | } | |
d50084a2 | 323 | return ret; |
1da177e4 LT |
324 | } |
325 | ||
326 | int console_write_chan(struct list_head *chans, const char *buf, int len) | |
327 | { | |
328 | struct list_head *ele; | |
329 | struct chan *chan; | |
330 | int n, ret = 0; | |
331 | ||
332 | list_for_each(ele, chans){ | |
333 | chan = list_entry(ele, struct chan, list); | |
334 | if(!chan->output || (chan->ops->console_write == NULL)) | |
335 | continue; | |
55c033c1 | 336 | n = chan->ops->console_write(chan->fd, buf, len); |
1da177e4 LT |
337 | if(chan->primary) ret = n; |
338 | } | |
d50084a2 | 339 | return ret; |
1da177e4 LT |
340 | } |
341 | ||
d50084a2 | 342 | int console_open_chan(struct line *line, struct console *co, |
5e7672ec | 343 | const struct chan_opts *opts) |
1da177e4 | 344 | { |
1f80171e JD |
345 | int err; |
346 | ||
347 | err = open_chan(&line->chan_list); | |
348 | if(err) | |
349 | return err; | |
1da177e4 | 350 | |
1da177e4 LT |
351 | printk("Console initialized on /dev/%s%d\n",co->name,co->index); |
352 | return 0; | |
353 | } | |
354 | ||
355 | int chan_window_size(struct list_head *chans, unsigned short *rows_out, | |
356 | unsigned short *cols_out) | |
357 | { | |
358 | struct list_head *ele; | |
359 | struct chan *chan; | |
360 | ||
361 | list_for_each(ele, chans){ | |
362 | chan = list_entry(ele, struct chan, list); | |
363 | if(chan->primary){ | |
d50084a2 JD |
364 | if(chan->ops->window_size == NULL) |
365 | return 0; | |
366 | return chan->ops->window_size(chan->fd, chan->data, | |
367 | rows_out, cols_out); | |
1da177e4 LT |
368 | } |
369 | } | |
d50084a2 | 370 | return 0; |
1da177e4 LT |
371 | } |
372 | ||
42947cb9 | 373 | static void free_one_chan(struct chan *chan, int delay_free_irq) |
1da177e4 LT |
374 | { |
375 | list_del(&chan->list); | |
165dc591 JD |
376 | |
377 | close_one_chan(chan, delay_free_irq); | |
378 | ||
1da177e4 LT |
379 | if(chan->ops->free != NULL) |
380 | (*chan->ops->free)(chan->data); | |
165dc591 | 381 | |
1da177e4 LT |
382 | if(chan->primary && chan->output) ignore_sigio_fd(chan->fd); |
383 | kfree(chan); | |
384 | } | |
385 | ||
42947cb9 | 386 | static void free_chan(struct list_head *chans, int delay_free_irq) |
1da177e4 LT |
387 | { |
388 | struct list_head *ele, *next; | |
389 | struct chan *chan; | |
390 | ||
391 | list_for_each_safe(ele, next, chans){ | |
392 | chan = list_entry(ele, struct chan, list); | |
165dc591 | 393 | free_one_chan(chan, delay_free_irq); |
1da177e4 LT |
394 | } |
395 | } | |
396 | ||
397 | static int one_chan_config_string(struct chan *chan, char *str, int size, | |
398 | char **error_out) | |
399 | { | |
400 | int n = 0; | |
401 | ||
402 | if(chan == NULL){ | |
403 | CONFIG_CHUNK(str, size, n, "none", 1); | |
d50084a2 | 404 | return n; |
1da177e4 LT |
405 | } |
406 | ||
407 | CONFIG_CHUNK(str, size, n, chan->ops->type, 0); | |
408 | ||
409 | if(chan->dev == NULL){ | |
410 | CONFIG_CHUNK(str, size, n, "", 1); | |
d50084a2 | 411 | return n; |
1da177e4 LT |
412 | } |
413 | ||
414 | CONFIG_CHUNK(str, size, n, ":", 0); | |
415 | CONFIG_CHUNK(str, size, n, chan->dev, 0); | |
416 | ||
d50084a2 | 417 | return n; |
1da177e4 LT |
418 | } |
419 | ||
d50084a2 | 420 | static int chan_pair_config_string(struct chan *in, struct chan *out, |
1da177e4 LT |
421 | char *str, int size, char **error_out) |
422 | { | |
423 | int n; | |
424 | ||
425 | n = one_chan_config_string(in, str, size, error_out); | |
426 | str += n; | |
427 | size -= n; | |
428 | ||
429 | if(in == out){ | |
430 | CONFIG_CHUNK(str, size, n, "", 1); | |
d50084a2 | 431 | return n; |
1da177e4 LT |
432 | } |
433 | ||
434 | CONFIG_CHUNK(str, size, n, ",", 1); | |
435 | n = one_chan_config_string(out, str, size, error_out); | |
436 | str += n; | |
437 | size -= n; | |
438 | CONFIG_CHUNK(str, size, n, "", 1); | |
439 | ||
d50084a2 | 440 | return n; |
1da177e4 LT |
441 | } |
442 | ||
d50084a2 | 443 | int chan_config_string(struct list_head *chans, char *str, int size, |
1da177e4 LT |
444 | char **error_out) |
445 | { | |
446 | struct list_head *ele; | |
447 | struct chan *chan, *in = NULL, *out = NULL; | |
448 | ||
449 | list_for_each(ele, chans){ | |
450 | chan = list_entry(ele, struct chan, list); | |
451 | if(!chan->primary) | |
452 | continue; | |
453 | if(chan->input) | |
454 | in = chan; | |
455 | if(chan->output) | |
456 | out = chan; | |
457 | } | |
458 | ||
d50084a2 | 459 | return chan_pair_config_string(in, out, str, size, error_out); |
1da177e4 LT |
460 | } |
461 | ||
462 | struct chan_type { | |
463 | char *key; | |
5e7672ec | 464 | const struct chan_ops *ops; |
1da177e4 LT |
465 | }; |
466 | ||
5e7672ec | 467 | static const struct chan_type chan_table[] = { |
1da177e4 LT |
468 | { "fd", &fd_ops }, |
469 | ||
470 | #ifdef CONFIG_NULL_CHAN | |
471 | { "null", &null_ops }, | |
472 | #else | |
473 | { "null", ¬_configged_ops }, | |
474 | #endif | |
475 | ||
476 | #ifdef CONFIG_PORT_CHAN | |
477 | { "port", &port_ops }, | |
478 | #else | |
479 | { "port", ¬_configged_ops }, | |
480 | #endif | |
481 | ||
482 | #ifdef CONFIG_PTY_CHAN | |
483 | { "pty", &pty_ops }, | |
484 | { "pts", &pts_ops }, | |
485 | #else | |
486 | { "pty", ¬_configged_ops }, | |
487 | { "pts", ¬_configged_ops }, | |
488 | #endif | |
489 | ||
490 | #ifdef CONFIG_TTY_CHAN | |
491 | { "tty", &tty_ops }, | |
492 | #else | |
493 | { "tty", ¬_configged_ops }, | |
494 | #endif | |
495 | ||
496 | #ifdef CONFIG_XTERM_CHAN | |
497 | { "xterm", &xterm_ops }, | |
498 | #else | |
499 | { "xterm", ¬_configged_ops }, | |
500 | #endif | |
501 | }; | |
502 | ||
165dc591 | 503 | static struct chan *parse_chan(struct line *line, char *str, int device, |
f28169d2 | 504 | const struct chan_opts *opts, char **error_out) |
1da177e4 | 505 | { |
5e7672ec JD |
506 | const struct chan_type *entry; |
507 | const struct chan_ops *ops; | |
1da177e4 LT |
508 | struct chan *chan; |
509 | void *data; | |
510 | int i; | |
511 | ||
512 | ops = NULL; | |
513 | data = NULL; | |
91b165c0 | 514 | for(i = 0; i < ARRAY_SIZE(chan_table); i++){ |
1da177e4 LT |
515 | entry = &chan_table[i]; |
516 | if(!strncmp(str, entry->key, strlen(entry->key))){ | |
517 | ops = entry->ops; | |
518 | str += strlen(entry->key); | |
519 | break; | |
520 | } | |
521 | } | |
522 | if(ops == NULL){ | |
f28169d2 | 523 | *error_out = "No match for configured backends"; |
d50084a2 | 524 | return NULL; |
1da177e4 | 525 | } |
f28169d2 | 526 | |
1da177e4 | 527 | data = (*ops->init)(str, device, opts); |
f28169d2 JD |
528 | if(data == NULL){ |
529 | *error_out = "Configuration failed"; | |
d50084a2 | 530 | return NULL; |
f28169d2 | 531 | } |
1da177e4 | 532 | |
79ae2cb8 | 533 | chan = kmalloc(sizeof(*chan), GFP_ATOMIC); |
f28169d2 JD |
534 | if(chan == NULL){ |
535 | *error_out = "Memory allocation failed"; | |
d50084a2 | 536 | return NULL; |
f28169d2 | 537 | } |
1da177e4 | 538 | *chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list), |
165dc591 JD |
539 | .free_list = |
540 | LIST_HEAD_INIT(chan->free_list), | |
541 | .line = line, | |
1da177e4 LT |
542 | .primary = 1, |
543 | .input = 0, | |
544 | .output = 0, | |
545 | .opened = 0, | |
165dc591 | 546 | .enabled = 0, |
1da177e4 | 547 | .fd = -1, |
1da177e4 LT |
548 | .ops = ops, |
549 | .data = data }); | |
d50084a2 | 550 | return chan; |
1da177e4 LT |
551 | } |
552 | ||
165dc591 | 553 | int parse_chan_pair(char *str, struct line *line, int device, |
f28169d2 | 554 | const struct chan_opts *opts, char **error_out) |
1da177e4 | 555 | { |
165dc591 | 556 | struct list_head *chans = &line->chan_list; |
1da177e4 LT |
557 | struct chan *new, *chan; |
558 | char *in, *out; | |
559 | ||
560 | if(!list_empty(chans)){ | |
561 | chan = list_entry(chans->next, struct chan, list); | |
165dc591 | 562 | free_chan(chans, 0); |
1da177e4 LT |
563 | INIT_LIST_HEAD(chans); |
564 | } | |
565 | ||
566 | out = strchr(str, ','); | |
567 | if(out != NULL){ | |
568 | in = str; | |
569 | *out = '\0'; | |
570 | out++; | |
f28169d2 | 571 | new = parse_chan(line, in, device, opts, error_out); |
d50084a2 JD |
572 | if(new == NULL) |
573 | return -1; | |
574 | ||
1da177e4 LT |
575 | new->input = 1; |
576 | list_add(&new->list, chans); | |
577 | ||
f28169d2 | 578 | new = parse_chan(line, out, device, opts, error_out); |
d50084a2 JD |
579 | if(new == NULL) |
580 | return -1; | |
581 | ||
1da177e4 LT |
582 | list_add(&new->list, chans); |
583 | new->output = 1; | |
584 | } | |
585 | else { | |
f28169d2 | 586 | new = parse_chan(line, str, device, opts, error_out); |
d50084a2 JD |
587 | if(new == NULL) |
588 | return -1; | |
589 | ||
1da177e4 LT |
590 | list_add(&new->list, chans); |
591 | new->input = 1; | |
592 | new->output = 1; | |
593 | } | |
d50084a2 | 594 | return 0; |
1da177e4 LT |
595 | } |
596 | ||
597 | int chan_out_fd(struct list_head *chans) | |
598 | { | |
599 | struct list_head *ele; | |
600 | struct chan *chan; | |
601 | ||
602 | list_for_each(ele, chans){ | |
603 | chan = list_entry(ele, struct chan, list); | |
604 | if(chan->primary && chan->output) | |
d50084a2 | 605 | return chan->fd; |
1da177e4 | 606 | } |
d50084a2 | 607 | return -1; |
1da177e4 LT |
608 | } |
609 | ||
6d5aefb8 | 610 | void chan_interrupt(struct list_head *chans, struct delayed_work *task, |
1da177e4 LT |
611 | struct tty_struct *tty, int irq) |
612 | { | |
613 | struct list_head *ele, *next; | |
614 | struct chan *chan; | |
615 | int err; | |
616 | char c; | |
617 | ||
618 | list_for_each_safe(ele, next, chans){ | |
619 | chan = list_entry(ele, struct chan, list); | |
620 | if(!chan->input || (chan->ops->read == NULL)) continue; | |
621 | do { | |
33f0f88f | 622 | if (tty && !tty_buffer_request_room(tty, 1)) { |
9159c9df | 623 | schedule_delayed_work(task, 1); |
1da177e4 LT |
624 | goto out; |
625 | } | |
626 | err = chan->ops->read(chan->fd, &c, chan->data); | |
627 | if(err > 0) | |
628 | tty_receive_char(tty, c); | |
629 | } while(err > 0); | |
630 | ||
631 | if(err == 0) reactivate_fd(chan->fd, irq); | |
632 | if(err == -EIO){ | |
633 | if(chan->primary){ | |
634 | if(tty != NULL) | |
635 | tty_hangup(tty); | |
165dc591 | 636 | close_chan(chans, 1); |
1da177e4 LT |
637 | return; |
638 | } | |
165dc591 | 639 | else close_one_chan(chan, 1); |
1da177e4 LT |
640 | } |
641 | } | |
642 | out: | |
643 | if(tty) tty_flip_buffer_push(tty); | |
644 | } |