2 * Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
3 * Licensed under the GPL
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>
14 #include "chan_kern.h"
15 #include "user_util.h"
22 #ifdef CONFIG_NOCONFIG_CHAN
23 static void *not_configged_init(char *str, int device, struct chan_opts *opts)
25 printk(KERN_ERR "Using a channel type which is configured out of "
30 static int not_configged_open(int input, int output, int primary, void *data,
33 printk(KERN_ERR "Using a channel type which is configured out of "
38 static void not_configged_close(int fd, void *data)
40 printk(KERN_ERR "Using a channel type which is configured out of "
44 static int not_configged_read(int fd, char *c_out, void *data)
46 printk(KERN_ERR "Using a channel type which is configured out of "
51 static int not_configged_write(int fd, const char *buf, int len, void *data)
53 printk(KERN_ERR "Using a channel type which is configured out of "
58 static int not_configged_console_write(int fd, const char *buf, int len,
61 printk(KERN_ERR "Using a channel type which is configured out of "
66 static int not_configged_window_size(int fd, void *data, unsigned short *rows,
69 printk(KERN_ERR "Using a channel type which is configured out of "
74 static void not_configged_free(void *data)
76 printk(KERN_ERR "Using a channel type which is configured out of "
80 static struct chan_ops not_configged_ops = {
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,
91 #endif /* CONFIG_NOCONFIG_CHAN */
93 void generic_close(int fd, void *unused)
98 int generic_read(int fd, char *c_out, void *unused)
102 n = os_read_file(fd, c_out, sizeof(*c_out));
111 /* XXX Trivial wrapper around os_write_file */
113 int generic_write(int fd, const char *buf, int n, void *unused)
115 return(os_write_file(fd, buf, n));
118 int generic_window_size(int fd, void *unused, unsigned short *rows_out,
119 unsigned short *cols_out)
124 ret = os_window_size(fd, &rows, &cols);
128 ret = ((*rows_out != rows) || (*cols_out != cols));
136 void generic_free(void *data)
141 static void tty_receive_char(struct tty_struct *tty, char ch)
143 if(tty == NULL) return;
145 if(I_IXON(tty) && !I_IXOFF(tty) && !tty->raw) {
146 if(ch == STOP_CHAR(tty)){
150 else if(ch == START_CHAR(tty)){
156 if((tty->flip.flag_buf_ptr == NULL) ||
157 (tty->flip.char_buf_ptr == NULL))
159 tty_insert_flip_char(tty, ch, TTY_NORMAL);
162 static int open_one_chan(struct chan *chan, int input, int output, int primary)
166 if(chan->opened) return(0);
167 if(chan->ops->open == NULL) fd = 0;
168 else fd = (*chan->ops->open)(input, output, primary, chan->data,
170 if(fd < 0) return(fd);
177 int open_chan(struct list_head *chans)
179 struct list_head *ele;
183 list_for_each(ele, chans){
184 chan = list_entry(ele, struct chan, list);
185 ret = open_one_chan(chan, chan->input, chan->output,
187 if(chan->primary) err = ret;
192 void chan_enable_winch(struct list_head *chans, void *line)
194 struct list_head *ele;
197 list_for_each(ele, chans){
198 chan = list_entry(ele, struct chan, list);
199 if(chan->primary && chan->output && chan->ops->winch){
200 register_winch(chan->fd, line);
206 void enable_chan(struct list_head *chans, void *data)
208 struct list_head *ele;
211 list_for_each(ele, chans){
212 chan = list_entry(ele, struct chan, list);
213 if(!chan->opened) continue;
215 line_setup_irq(chan->fd, chan->input, chan->output, data);
219 void close_chan(struct list_head *chans)
221 struct list_head *ele;
224 /* Close in reverse order as open in case more than one of them
225 * refers to the same device and they save and restore that device's
226 * state. Then, the first one opened will have the original state,
227 * so it must be the last closed.
229 for(ele = chans->prev; ele != chans; ele = ele->prev){
230 chan = list_entry(ele, struct chan, list);
231 if(!chan->opened) continue;
232 if(chan->ops->close != NULL)
233 (*chan->ops->close)(chan->fd, chan->data);
239 int write_chan(struct list_head *chans, const char *buf, int len,
242 struct list_head *ele;
246 list_for_each(ele, chans){
247 chan = list_entry(ele, struct chan, list);
248 if(!chan->output || (chan->ops->write == NULL)) continue;
249 n = chan->ops->write(chan->fd, buf, len, chan->data);
252 if((ret == -EAGAIN) || ((ret >= 0) && (ret < len))){
253 reactivate_fd(chan->fd, write_irq);
254 if(ret == -EAGAIN) ret = 0;
261 int console_write_chan(struct list_head *chans, const char *buf, int len)
263 struct list_head *ele;
267 list_for_each(ele, chans){
268 chan = list_entry(ele, struct chan, list);
269 if(!chan->output || (chan->ops->console_write == NULL))
271 n = chan->ops->console_write(chan->fd, buf, len, chan->data);
272 if(chan->primary) ret = n;
277 int chan_window_size(struct list_head *chans, unsigned short *rows_out,
278 unsigned short *cols_out)
280 struct list_head *ele;
283 list_for_each(ele, chans){
284 chan = list_entry(ele, struct chan, list);
286 if(chan->ops->window_size == NULL) return(0);
287 return(chan->ops->window_size(chan->fd, chan->data,
288 rows_out, cols_out));
294 void free_one_chan(struct chan *chan)
296 list_del(&chan->list);
297 if(chan->ops->free != NULL)
298 (*chan->ops->free)(chan->data);
299 free_irq_by_fd(chan->fd);
300 if(chan->primary && chan->output) ignore_sigio_fd(chan->fd);
304 void free_chan(struct list_head *chans)
306 struct list_head *ele, *next;
309 list_for_each_safe(ele, next, chans){
310 chan = list_entry(ele, struct chan, list);
315 static int one_chan_config_string(struct chan *chan, char *str, int size,
321 CONFIG_CHUNK(str, size, n, "none", 1);
325 CONFIG_CHUNK(str, size, n, chan->ops->type, 0);
327 if(chan->dev == NULL){
328 CONFIG_CHUNK(str, size, n, "", 1);
332 CONFIG_CHUNK(str, size, n, ":", 0);
333 CONFIG_CHUNK(str, size, n, chan->dev, 0);
338 static int chan_pair_config_string(struct chan *in, struct chan *out,
339 char *str, int size, char **error_out)
343 n = one_chan_config_string(in, str, size, error_out);
348 CONFIG_CHUNK(str, size, n, "", 1);
352 CONFIG_CHUNK(str, size, n, ",", 1);
353 n = one_chan_config_string(out, str, size, error_out);
356 CONFIG_CHUNK(str, size, n, "", 1);
361 int chan_config_string(struct list_head *chans, char *str, int size,
364 struct list_head *ele;
365 struct chan *chan, *in = NULL, *out = NULL;
367 list_for_each(ele, chans){
368 chan = list_entry(ele, struct chan, list);
377 return(chan_pair_config_string(in, out, str, size, error_out));
382 struct chan_ops *ops;
385 struct chan_type chan_table[] = {
386 #ifdef CONFIG_FD_CHAN
389 { "fd", ¬_configged_ops },
392 #ifdef CONFIG_NULL_CHAN
393 { "null", &null_ops },
395 { "null", ¬_configged_ops },
398 #ifdef CONFIG_PORT_CHAN
399 { "port", &port_ops },
401 { "port", ¬_configged_ops },
404 #ifdef CONFIG_PTY_CHAN
408 { "pty", ¬_configged_ops },
409 { "pts", ¬_configged_ops },
412 #ifdef CONFIG_TTY_CHAN
415 { "tty", ¬_configged_ops },
418 #ifdef CONFIG_XTERM_CHAN
419 { "xterm", &xterm_ops },
421 { "xterm", ¬_configged_ops },
425 static struct chan *parse_chan(char *str, int pri, int device,
426 struct chan_opts *opts)
428 struct chan_type *entry;
429 struct chan_ops *ops;
436 for(i = 0; i < sizeof(chan_table)/sizeof(chan_table[0]); i++){
437 entry = &chan_table[i];
438 if(!strncmp(str, entry->key, strlen(entry->key))){
440 str += strlen(entry->key);
445 printk(KERN_ERR "parse_chan couldn't parse \"%s\"\n",
449 if(ops->init == NULL) return(NULL);
450 data = (*ops->init)(str, device, opts);
451 if(data == NULL) return(NULL);
453 chan = kmalloc(sizeof(*chan), GFP_KERNEL);
454 if(chan == NULL) return(NULL);
455 *chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list),
467 int parse_chan_pair(char *str, struct list_head *chans, int pri, int device,
468 struct chan_opts *opts)
470 struct chan *new, *chan;
473 if(!list_empty(chans)){
474 chan = list_entry(chans->next, struct chan, list);
475 if(chan->pri >= pri) return(0);
477 INIT_LIST_HEAD(chans);
480 out = strchr(str, ',');
485 new = parse_chan(in, pri, device, opts);
486 if(new == NULL) return(-1);
488 list_add(&new->list, chans);
490 new = parse_chan(out, pri, device, opts);
491 if(new == NULL) return(-1);
492 list_add(&new->list, chans);
496 new = parse_chan(str, pri, device, opts);
497 if(new == NULL) return(-1);
498 list_add(&new->list, chans);
505 int chan_out_fd(struct list_head *chans)
507 struct list_head *ele;
510 list_for_each(ele, chans){
511 chan = list_entry(ele, struct chan, list);
512 if(chan->primary && chan->output)
518 void chan_interrupt(struct list_head *chans, struct work_struct *task,
519 struct tty_struct *tty, int irq, void *dev)
521 struct list_head *ele, *next;
526 list_for_each_safe(ele, next, chans){
527 chan = list_entry(ele, struct chan, list);
528 if(!chan->input || (chan->ops->read == NULL)) continue;
531 (tty->flip.count >= TTY_FLIPBUF_SIZE)){
535 err = chan->ops->read(chan->fd, &c, chan->data);
537 tty_receive_char(tty, c);
540 if(err == 0) reactivate_fd(chan->fd, irq);
545 line_disable(dev, irq);
551 if(chan->ops->close != NULL)
552 chan->ops->close(chan->fd, chan->data);
558 if(tty) tty_flip_buffer_push(tty);
562 * Overrides for Emacs so that we follow Linus's tabbing style.
563 * Emacs will notice this stuff at the end of the file and automatically
564 * adjust the settings for this buffer only. This must remain at the end
566 * ---------------------------------------------------------------------------
568 * c-file-style: "linux"