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, struct tty_struct *tty)
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, tty);
206 void enable_chan(struct list_head *chans, struct tty_struct *tty)
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, tty);
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;
243 struct chan *chan = NULL;
246 list_for_each(ele, chans) {
247 chan = list_entry(ele, struct chan, list);
248 if (!chan->output || (chan->ops->write == NULL))
250 n = chan->ops->write(chan->fd, buf, len, chan->data);
253 if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len))){
254 reactivate_fd(chan->fd, write_irq);
263 int console_write_chan(struct list_head *chans, const char *buf, int len)
265 struct list_head *ele;
269 list_for_each(ele, chans){
270 chan = list_entry(ele, struct chan, list);
271 if(!chan->output || (chan->ops->console_write == NULL))
273 n = chan->ops->console_write(chan->fd, buf, len, chan->data);
274 if(chan->primary) ret = n;
279 int console_open_chan(struct line *line, struct console *co, struct chan_opts *opts)
281 if (!list_empty(&line->chan_list))
284 if (0 != parse_chan_pair(line->init_str, &line->chan_list,
285 line->init_pri, co->index, opts))
287 if (0 != open_chan(&line->chan_list))
289 printk("Console initialized on /dev/%s%d\n",co->name,co->index);
293 int chan_window_size(struct list_head *chans, unsigned short *rows_out,
294 unsigned short *cols_out)
296 struct list_head *ele;
299 list_for_each(ele, chans){
300 chan = list_entry(ele, struct chan, list);
302 if(chan->ops->window_size == NULL) return(0);
303 return(chan->ops->window_size(chan->fd, chan->data,
304 rows_out, cols_out));
310 void free_one_chan(struct chan *chan)
312 list_del(&chan->list);
313 if(chan->ops->free != NULL)
314 (*chan->ops->free)(chan->data);
315 free_irq_by_fd(chan->fd);
316 if(chan->primary && chan->output) ignore_sigio_fd(chan->fd);
320 void free_chan(struct list_head *chans)
322 struct list_head *ele, *next;
325 list_for_each_safe(ele, next, chans){
326 chan = list_entry(ele, struct chan, list);
331 static int one_chan_config_string(struct chan *chan, char *str, int size,
337 CONFIG_CHUNK(str, size, n, "none", 1);
341 CONFIG_CHUNK(str, size, n, chan->ops->type, 0);
343 if(chan->dev == NULL){
344 CONFIG_CHUNK(str, size, n, "", 1);
348 CONFIG_CHUNK(str, size, n, ":", 0);
349 CONFIG_CHUNK(str, size, n, chan->dev, 0);
354 static int chan_pair_config_string(struct chan *in, struct chan *out,
355 char *str, int size, char **error_out)
359 n = one_chan_config_string(in, str, size, error_out);
364 CONFIG_CHUNK(str, size, n, "", 1);
368 CONFIG_CHUNK(str, size, n, ",", 1);
369 n = one_chan_config_string(out, str, size, error_out);
372 CONFIG_CHUNK(str, size, n, "", 1);
377 int chan_config_string(struct list_head *chans, char *str, int size,
380 struct list_head *ele;
381 struct chan *chan, *in = NULL, *out = NULL;
383 list_for_each(ele, chans){
384 chan = list_entry(ele, struct chan, list);
393 return(chan_pair_config_string(in, out, str, size, error_out));
398 struct chan_ops *ops;
401 struct chan_type chan_table[] = {
404 #ifdef CONFIG_NULL_CHAN
405 { "null", &null_ops },
407 { "null", ¬_configged_ops },
410 #ifdef CONFIG_PORT_CHAN
411 { "port", &port_ops },
413 { "port", ¬_configged_ops },
416 #ifdef CONFIG_PTY_CHAN
420 { "pty", ¬_configged_ops },
421 { "pts", ¬_configged_ops },
424 #ifdef CONFIG_TTY_CHAN
427 { "tty", ¬_configged_ops },
430 #ifdef CONFIG_XTERM_CHAN
431 { "xterm", &xterm_ops },
433 { "xterm", ¬_configged_ops },
437 static struct chan *parse_chan(char *str, int pri, int device,
438 struct chan_opts *opts)
440 struct chan_type *entry;
441 struct chan_ops *ops;
448 for(i = 0; i < sizeof(chan_table)/sizeof(chan_table[0]); i++){
449 entry = &chan_table[i];
450 if(!strncmp(str, entry->key, strlen(entry->key))){
452 str += strlen(entry->key);
457 printk(KERN_ERR "parse_chan couldn't parse \"%s\"\n",
461 if(ops->init == NULL) return(NULL);
462 data = (*ops->init)(str, device, opts);
463 if(data == NULL) return(NULL);
465 chan = kmalloc(sizeof(*chan), GFP_KERNEL);
466 if(chan == NULL) return(NULL);
467 *chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list),
479 int parse_chan_pair(char *str, struct list_head *chans, int pri, int device,
480 struct chan_opts *opts)
482 struct chan *new, *chan;
485 if(!list_empty(chans)){
486 chan = list_entry(chans->next, struct chan, list);
487 if(chan->pri >= pri) return(0);
489 INIT_LIST_HEAD(chans);
492 out = strchr(str, ',');
497 new = parse_chan(in, pri, device, opts);
498 if(new == NULL) return(-1);
500 list_add(&new->list, chans);
502 new = parse_chan(out, pri, device, opts);
503 if(new == NULL) return(-1);
504 list_add(&new->list, chans);
508 new = parse_chan(str, pri, device, opts);
509 if(new == NULL) return(-1);
510 list_add(&new->list, chans);
517 int chan_out_fd(struct list_head *chans)
519 struct list_head *ele;
522 list_for_each(ele, chans){
523 chan = list_entry(ele, struct chan, list);
524 if(chan->primary && chan->output)
530 void chan_interrupt(struct list_head *chans, struct work_struct *task,
531 struct tty_struct *tty, int irq)
533 struct list_head *ele, *next;
538 list_for_each_safe(ele, next, chans){
539 chan = list_entry(ele, struct chan, list);
540 if(!chan->input || (chan->ops->read == NULL)) continue;
543 (tty->flip.count >= TTY_FLIPBUF_SIZE)){
547 err = chan->ops->read(chan->fd, &c, chan->data);
549 tty_receive_char(tty, c);
552 if(err == 0) reactivate_fd(chan->fd, irq);
557 line_disable(tty, irq);
563 if(chan->ops->close != NULL)
564 chan->ops->close(chan->fd, chan->data);
570 if(tty) tty_flip_buffer_push(tty);
574 * Overrides for Emacs so that we follow Linus's tabbing style.
575 * Emacs will notice this stuff at the end of the file and automatically
576 * adjust the settings for this buffer only. This must remain at the end
578 * ---------------------------------------------------------------------------
580 * c-file-style: "linux"