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