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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.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 int open_one_chan(struct chan *chan)
85{
86 int fd, err;
87
88 if (chan->opened)
89 return 0;
90
91 if (chan->ops->open == NULL)
92 fd = 0;
93 else fd = (*chan->ops->open)(chan->input, chan->output, chan->primary,
94 chan->data, &chan->dev);
95 if (fd < 0)
96 return fd;
97
98 err = os_set_fd_block(fd, 0);
99 if (err) {
100 (*chan->ops->close)(fd, chan->data);
101 return err;
102 }
103
104 chan->fd = fd;
105
106 chan->opened = 1;
107 return 0;
108}
109
110static int open_chan(struct list_head *chans)
111{
112 struct list_head *ele;
113 struct chan *chan;
114 int ret, err = 0;
115
116 list_for_each(ele, chans) {
117 chan = list_entry(ele, struct chan, list);
118 ret = open_one_chan(chan);
119 if (chan->primary)
120 err = ret;
121 }
122 return err;
123}
124
125void chan_enable_winch(struct chan *chan, struct tty_port *port)
126{
127 if (chan && chan->primary && chan->ops->winch)
128 register_winch(chan->fd, port);
129}
130
131static void line_timer_cb(struct work_struct *work)
132{
133 struct line *line = container_of(work, struct line, task.work);
134
135 if (!line->throttled)
136 chan_interrupt(line, line->driver->read_irq);
137}
138
139int enable_chan(struct line *line)
140{
141 struct list_head *ele;
142 struct chan *chan;
143 int err;
144
145 INIT_DELAYED_WORK(&line->task, line_timer_cb);
146
147 list_for_each(ele, &line->chan_list) {
148 chan = list_entry(ele, struct chan, list);
149 err = open_one_chan(chan);
150 if (err) {
151 if (chan->primary)
152 goto out_close;
153
154 continue;
155 }
156
157 if (chan->enabled)
158 continue;
159 err = line_setup_irq(chan->fd, chan->input, chan->output, line,
160 chan);
161 if (err)
162 goto out_close;
163
164 chan->enabled = 1;
165 }
166
167 return 0;
168
169 out_close:
170 close_chan(line);
171 return err;
172}
173
174static void close_one_chan(struct chan *chan, int delay_free_irq)
175{
176 if (!chan->opened)
177 return;
178
179 /* we can safely call free now - it will be marked
180 * as free and freed once the IRQ stopped processing
181 */
182 if (chan->input && chan->enabled)
183 um_free_irq(chan->line->driver->read_irq, chan);
184 if (chan->output && chan->enabled)
185 um_free_irq(chan->line->driver->write_irq, chan);
186 chan->enabled = 0;
187 if (chan->ops->close != NULL)
188 (*chan->ops->close)(chan->fd, chan->data);
189
190 chan->opened = 0;
191 chan->fd = -1;
192}
193
194void close_chan(struct line *line)
195{
196 struct chan *chan;
197
198 /* Close in reverse order as open in case more than one of them
199 * refers to the same device and they save and restore that device's
200 * state. Then, the first one opened will have the original state,
201 * so it must be the last closed.
202 */
203 list_for_each_entry_reverse(chan, &line->chan_list, list) {
204 close_one_chan(chan, 0);
205 }
206}
207
208void deactivate_chan(struct chan *chan, int irq)
209{
210 if (chan && chan->enabled)
211 deactivate_fd(chan->fd, irq);
212}
213
214void reactivate_chan(struct chan *chan, int irq)
215{
216 if (chan && chan->enabled)
217 reactivate_fd(chan->fd, irq);
218}
219
220int write_chan(struct chan *chan, const char *buf, int len,
221 int write_irq)
222{
223 int n, ret = 0;
224
225 if (len == 0 || !chan || !chan->ops->write)
226 return 0;
227
228 n = chan->ops->write(chan->fd, buf, len, chan->data);
229 if (chan->primary) {
230 ret = n;
231 if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len)))
232 reactivate_fd(chan->fd, write_irq);
233 }
234 return ret;
235}
236
237int console_write_chan(struct chan *chan, const char *buf, int len)
238{
239 int n, ret = 0;
240
241 if (!chan || !chan->ops->console_write)
242 return 0;
243
244 n = chan->ops->console_write(chan->fd, buf, len);
245 if (chan->primary)
246 ret = n;
247 return ret;
248}
249
250int console_open_chan(struct line *line, struct console *co)
251{
252 int err;
253
254 err = open_chan(&line->chan_list);
255 if (err)
256 return err;
257
258 printk(KERN_INFO "Console initialized on /dev/%s%d\n", co->name,
259 co->index);
260 return 0;
261}
262
263int chan_window_size(struct line *line, unsigned short *rows_out,
264 unsigned short *cols_out)
265{
266 struct chan *chan;
267
268 chan = line->chan_in;
269 if (chan && chan->primary) {
270 if (chan->ops->window_size == NULL)
271 return 0;
272 return chan->ops->window_size(chan->fd, chan->data,
273 rows_out, cols_out);
274 }
275 chan = line->chan_out;
276 if (chan && chan->primary) {
277 if (chan->ops->window_size == NULL)
278 return 0;
279 return chan->ops->window_size(chan->fd, chan->data,
280 rows_out, cols_out);
281 }
282 return 0;
283}
284
285static void free_one_chan(struct chan *chan)
286{
287 list_del(&chan->list);
288
289 close_one_chan(chan, 0);
290
291 if (chan->ops->free != NULL)
292 (*chan->ops->free)(chan->data);
293
294 if (chan->primary && chan->output)
295 ignore_sigio_fd(chan->fd);
296 kfree(chan);
297}
298
299static void free_chan(struct list_head *chans)
300{
301 struct list_head *ele, *next;
302 struct chan *chan;
303
304 list_for_each_safe(ele, next, chans) {
305 chan = list_entry(ele, struct chan, list);
306 free_one_chan(chan);
307 }
308}
309
310static int one_chan_config_string(struct chan *chan, char *str, int size,
311 char **error_out)
312{
313 int n = 0;
314
315 if (chan == NULL) {
316 CONFIG_CHUNK(str, size, n, "none", 1);
317 return n;
318 }
319
320 CONFIG_CHUNK(str, size, n, chan->ops->type, 0);
321
322 if (chan->dev == NULL) {
323 CONFIG_CHUNK(str, size, n, "", 1);
324 return n;
325 }
326
327 CONFIG_CHUNK(str, size, n, ":", 0);
328 CONFIG_CHUNK(str, size, n, chan->dev, 0);
329
330 return n;
331}
332
333static int chan_pair_config_string(struct chan *in, struct chan *out,
334 char *str, int size, char **error_out)
335{
336 int n;
337
338 n = one_chan_config_string(in, str, size, error_out);
339 str += n;
340 size -= n;
341
342 if (in == out) {
343 CONFIG_CHUNK(str, size, n, "", 1);
344 return n;
345 }
346
347 CONFIG_CHUNK(str, size, n, ",", 1);
348 n = one_chan_config_string(out, str, size, error_out);
349 str += n;
350 size -= n;
351 CONFIG_CHUNK(str, size, n, "", 1);
352
353 return n;
354}
355
356int chan_config_string(struct line *line, char *str, int size,
357 char **error_out)
358{
359 struct chan *in = line->chan_in, *out = line->chan_out;
360
361 if (in && !in->primary)
362 in = NULL;
363 if (out && !out->primary)
364 out = NULL;
365
366 return chan_pair_config_string(in, out, str, size, error_out);
367}
368
369struct chan_type {
370 char *key;
371 const struct chan_ops *ops;
372};
373
374static const struct chan_type chan_table[] = {
375 { "fd", &fd_ops },
376
377#ifdef CONFIG_NULL_CHAN
378 { "null", &null_ops },
379#else
380 { "null", ¬_configged_ops },
381#endif
382
383#ifdef CONFIG_PORT_CHAN
384 { "port", &port_ops },
385#else
386 { "port", ¬_configged_ops },
387#endif
388
389#ifdef CONFIG_PTY_CHAN
390 { "pty", &pty_ops },
391 { "pts", &pts_ops },
392#else
393 { "pty", ¬_configged_ops },
394 { "pts", ¬_configged_ops },
395#endif
396
397#ifdef CONFIG_TTY_CHAN
398 { "tty", &tty_ops },
399#else
400 { "tty", ¬_configged_ops },
401#endif
402
403#ifdef CONFIG_XTERM_CHAN
404 { "xterm", &xterm_ops },
405#else
406 { "xterm", ¬_configged_ops },
407#endif
408};
409
410static struct chan *parse_chan(struct line *line, char *str, int device,
411 const struct chan_opts *opts, char **error_out)
412{
413 const struct chan_type *entry;
414 const struct chan_ops *ops;
415 struct chan *chan;
416 void *data;
417 int i;
418
419 ops = NULL;
420 data = NULL;
421 for(i = 0; i < ARRAY_SIZE(chan_table); i++) {
422 entry = &chan_table[i];
423 if (!strncmp(str, entry->key, strlen(entry->key))) {
424 ops = entry->ops;
425 str += strlen(entry->key);
426 break;
427 }
428 }
429 if (ops == NULL) {
430 *error_out = "No match for configured backends";
431 return NULL;
432 }
433
434 data = (*ops->init)(str, device, opts);
435 if (data == NULL) {
436 *error_out = "Configuration failed";
437 return NULL;
438 }
439
440 chan = kmalloc(sizeof(*chan), GFP_ATOMIC);
441 if (chan == NULL) {
442 *error_out = "Memory allocation failed";
443 return NULL;
444 }
445 *chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list),
446 .free_list =
447 LIST_HEAD_INIT(chan->free_list),
448 .line = line,
449 .primary = 1,
450 .input = 0,
451 .output = 0,
452 .opened = 0,
453 .enabled = 0,
454 .fd = -1,
455 .ops = ops,
456 .data = data });
457 return chan;
458}
459
460int parse_chan_pair(char *str, struct line *line, int device,
461 const struct chan_opts *opts, char **error_out)
462{
463 struct list_head *chans = &line->chan_list;
464 struct chan *new;
465 char *in, *out;
466
467 if (!list_empty(chans)) {
468 line->chan_in = line->chan_out = NULL;
469 free_chan(chans);
470 INIT_LIST_HEAD(chans);
471 }
472
473 if (!str)
474 return 0;
475
476 out = strchr(str, ',');
477 if (out != NULL) {
478 in = str;
479 *out = '\0';
480 out++;
481 new = parse_chan(line, in, device, opts, error_out);
482 if (new == NULL)
483 return -1;
484
485 new->input = 1;
486 list_add(&new->list, chans);
487 line->chan_in = new;
488
489 new = parse_chan(line, out, device, opts, error_out);
490 if (new == NULL)
491 return -1;
492
493 list_add(&new->list, chans);
494 new->output = 1;
495 line->chan_out = new;
496 }
497 else {
498 new = parse_chan(line, str, device, opts, error_out);
499 if (new == NULL)
500 return -1;
501
502 list_add(&new->list, chans);
503 new->input = 1;
504 new->output = 1;
505 line->chan_in = line->chan_out = new;
506 }
507 return 0;
508}
509
510void chan_interrupt(struct line *line, int irq)
511{
512 struct tty_port *port = &line->port;
513 struct chan *chan = line->chan_in;
514 int err;
515 char c;
516
517 if (!chan || !chan->ops->read)
518 goto out;
519
520 do {
521 if (!tty_buffer_request_room(port, 1)) {
522 schedule_delayed_work(&line->task, 1);
523 goto out;
524 }
525 err = chan->ops->read(chan->fd, &c, chan->data);
526 if (err > 0)
527 tty_insert_flip_char(port, c, TTY_NORMAL);
528 } while (err > 0);
529
530 if (err == 0)
531 reactivate_fd(chan->fd, irq);
532 if (err == -EIO) {
533 if (chan->primary) {
534 tty_port_tty_hangup(&line->port, false);
535 if (line->chan_out != chan)
536 close_one_chan(line->chan_out, 1);
537 }
538 close_one_chan(chan, 1);
539 if (chan->primary)
540 return;
541 }
542 out:
543 tty_flip_buffer_push(port);
544}