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 /* XXX: could well be moved to somewhere else, if needed. */
23 static int my_printf(const char * fmt, ...)
24 __attribute__ ((format (printf, 1, 2)));
26 static int my_printf(const char * fmt, ...)
28 /* Yes, can be called on atomic context.*/
29 char *buf = kmalloc(4096, GFP_ATOMIC);
34 /* We print directly fmt.
35 * Yes, yes, yes, feel free to complain. */
39 r = vsprintf(buf, fmt, args);
45 r = os_write_file(1, fmt, r);
50 #ifdef CONFIG_NOCONFIG_CHAN
51 /* Despite its name, there's no added trailing newline. */
52 static int my_puts(const char * buf)
54 return os_write_file(1, buf, strlen(buf));
57 static void *not_configged_init(char *str, int device, struct chan_opts *opts)
59 my_puts("Using a channel type which is configured out of "
64 static int not_configged_open(int input, int output, int primary, void *data,
67 my_puts("Using a channel type which is configured out of "
72 static void not_configged_close(int fd, void *data)
74 my_puts("Using a channel type which is configured out of "
78 static int not_configged_read(int fd, char *c_out, void *data)
80 my_puts("Using a channel type which is configured out of "
85 static int not_configged_write(int fd, const char *buf, int len, void *data)
87 my_puts("Using a channel type which is configured out of "
92 static int not_configged_console_write(int fd, const char *buf, int len)
94 my_puts("Using a channel type which is configured out of "
99 static int not_configged_window_size(int fd, void *data, unsigned short *rows,
100 unsigned short *cols)
102 my_puts("Using a channel type which is configured out of "
107 static void not_configged_free(void *data)
109 my_puts("Using a channel type which is configured out of "
113 static struct chan_ops not_configged_ops = {
114 .init = not_configged_init,
115 .open = not_configged_open,
116 .close = not_configged_close,
117 .read = not_configged_read,
118 .write = not_configged_write,
119 .console_write = not_configged_console_write,
120 .window_size = not_configged_window_size,
121 .free = not_configged_free,
124 #endif /* CONFIG_NOCONFIG_CHAN */
126 void generic_close(int fd, void *unused)
131 int generic_read(int fd, char *c_out, void *unused)
135 n = os_read_file(fd, c_out, sizeof(*c_out));
144 /* XXX Trivial wrapper around os_write_file */
146 int generic_write(int fd, const char *buf, int n, void *unused)
148 return os_write_file(fd, buf, n);
151 int generic_window_size(int fd, void *unused, unsigned short *rows_out,
152 unsigned short *cols_out)
157 ret = os_window_size(fd, &rows, &cols);
161 ret = ((*rows_out != rows) || (*cols_out != cols));
169 void generic_free(void *data)
174 static void tty_receive_char(struct tty_struct *tty, char ch)
176 if(tty == NULL) return;
178 if(I_IXON(tty) && !I_IXOFF(tty) && !tty->raw) {
179 if(ch == STOP_CHAR(tty)){
183 else if(ch == START_CHAR(tty)){
189 if((tty->flip.flag_buf_ptr == NULL) ||
190 (tty->flip.char_buf_ptr == NULL))
192 tty_insert_flip_char(tty, ch, TTY_NORMAL);
195 static int open_one_chan(struct chan *chan)
202 if(chan->ops->open == NULL)
204 else fd = (*chan->ops->open)(chan->input, chan->output, chan->primary,
205 chan->data, &chan->dev);
214 int open_chan(struct list_head *chans)
216 struct list_head *ele;
220 list_for_each(ele, chans){
221 chan = list_entry(ele, struct chan, list);
222 ret = open_one_chan(chan);
229 void chan_enable_winch(struct list_head *chans, struct tty_struct *tty)
231 struct list_head *ele;
234 list_for_each(ele, chans){
235 chan = list_entry(ele, struct chan, list);
236 if(chan->primary && chan->output && chan->ops->winch){
237 register_winch(chan->fd, tty);
243 void enable_chan(struct list_head *chans, struct tty_struct *tty)
245 struct list_head *ele;
248 list_for_each(ele, chans){
249 chan = list_entry(ele, struct chan, list);
250 if(!chan->opened) continue;
252 line_setup_irq(chan->fd, chan->input, chan->output, tty);
256 void close_chan(struct list_head *chans)
260 /* Close in reverse order as open in case more than one of them
261 * refers to the same device and they save and restore that device's
262 * state. Then, the first one opened will have the original state,
263 * so it must be the last closed.
265 list_for_each_entry_reverse(chan, chans, list) {
266 if(!chan->opened) continue;
267 if(chan->ops->close != NULL)
268 (*chan->ops->close)(chan->fd, chan->data);
274 int write_chan(struct list_head *chans, const char *buf, int len,
277 struct list_head *ele;
278 struct chan *chan = NULL;
281 list_for_each(ele, chans) {
282 chan = list_entry(ele, struct chan, list);
283 if (!chan->output || (chan->ops->write == NULL))
285 n = chan->ops->write(chan->fd, buf, len, chan->data);
288 if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len)))
289 reactivate_fd(chan->fd, write_irq);
295 int console_write_chan(struct list_head *chans, const char *buf, int len)
297 struct list_head *ele;
301 list_for_each(ele, chans){
302 chan = list_entry(ele, struct chan, list);
303 if(!chan->output || (chan->ops->console_write == NULL))
305 n = chan->ops->console_write(chan->fd, buf, len);
306 if(chan->primary) ret = n;
311 int console_open_chan(struct line *line, struct console *co,
312 struct chan_opts *opts)
316 err = open_chan(&line->chan_list);
320 printk("Console initialized on /dev/%s%d\n",co->name,co->index);
324 int chan_window_size(struct list_head *chans, unsigned short *rows_out,
325 unsigned short *cols_out)
327 struct list_head *ele;
330 list_for_each(ele, chans){
331 chan = list_entry(ele, struct chan, list);
333 if(chan->ops->window_size == NULL)
335 return chan->ops->window_size(chan->fd, chan->data,
342 void free_one_chan(struct chan *chan)
344 list_del(&chan->list);
345 if(chan->ops->free != NULL)
346 (*chan->ops->free)(chan->data);
347 free_irq_by_fd(chan->fd);
348 if(chan->primary && chan->output) ignore_sigio_fd(chan->fd);
352 void free_chan(struct list_head *chans)
354 struct list_head *ele, *next;
357 list_for_each_safe(ele, next, chans){
358 chan = list_entry(ele, struct chan, list);
363 static int one_chan_config_string(struct chan *chan, char *str, int size,
369 CONFIG_CHUNK(str, size, n, "none", 1);
373 CONFIG_CHUNK(str, size, n, chan->ops->type, 0);
375 if(chan->dev == NULL){
376 CONFIG_CHUNK(str, size, n, "", 1);
380 CONFIG_CHUNK(str, size, n, ":", 0);
381 CONFIG_CHUNK(str, size, n, chan->dev, 0);
386 static int chan_pair_config_string(struct chan *in, struct chan *out,
387 char *str, int size, char **error_out)
391 n = one_chan_config_string(in, str, size, error_out);
396 CONFIG_CHUNK(str, size, n, "", 1);
400 CONFIG_CHUNK(str, size, n, ",", 1);
401 n = one_chan_config_string(out, str, size, error_out);
404 CONFIG_CHUNK(str, size, n, "", 1);
409 int chan_config_string(struct list_head *chans, char *str, int size,
412 struct list_head *ele;
413 struct chan *chan, *in = NULL, *out = NULL;
415 list_for_each(ele, chans){
416 chan = list_entry(ele, struct chan, list);
425 return chan_pair_config_string(in, out, str, size, error_out);
430 struct chan_ops *ops;
433 struct chan_type chan_table[] = {
436 #ifdef CONFIG_NULL_CHAN
437 { "null", &null_ops },
439 { "null", ¬_configged_ops },
442 #ifdef CONFIG_PORT_CHAN
443 { "port", &port_ops },
445 { "port", ¬_configged_ops },
448 #ifdef CONFIG_PTY_CHAN
452 { "pty", ¬_configged_ops },
453 { "pts", ¬_configged_ops },
456 #ifdef CONFIG_TTY_CHAN
459 { "tty", ¬_configged_ops },
462 #ifdef CONFIG_XTERM_CHAN
463 { "xterm", &xterm_ops },
465 { "xterm", ¬_configged_ops },
469 static struct chan *parse_chan(char *str, int device, struct chan_opts *opts)
471 struct chan_type *entry;
472 struct chan_ops *ops;
479 for(i = 0; i < sizeof(chan_table)/sizeof(chan_table[0]); i++){
480 entry = &chan_table[i];
481 if(!strncmp(str, entry->key, strlen(entry->key))){
483 str += strlen(entry->key);
488 my_printf("parse_chan couldn't parse \"%s\"\n",
492 if(ops->init == NULL)
494 data = (*ops->init)(str, device, opts);
498 chan = kmalloc(sizeof(*chan), GFP_ATOMIC);
501 *chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list),
512 int parse_chan_pair(char *str, struct list_head *chans, int device,
513 struct chan_opts *opts)
515 struct chan *new, *chan;
518 if(!list_empty(chans)){
519 chan = list_entry(chans->next, struct chan, list);
521 INIT_LIST_HEAD(chans);
524 out = strchr(str, ',');
529 new = parse_chan(in, device, opts);
534 list_add(&new->list, chans);
536 new = parse_chan(out, device, opts);
540 list_add(&new->list, chans);
544 new = parse_chan(str, device, opts);
548 list_add(&new->list, chans);
555 int chan_out_fd(struct list_head *chans)
557 struct list_head *ele;
560 list_for_each(ele, chans){
561 chan = list_entry(ele, struct chan, list);
562 if(chan->primary && chan->output)
568 void chan_interrupt(struct list_head *chans, struct work_struct *task,
569 struct tty_struct *tty, int irq)
571 struct list_head *ele, *next;
576 list_for_each_safe(ele, next, chans){
577 chan = list_entry(ele, struct chan, list);
578 if(!chan->input || (chan->ops->read == NULL)) continue;
581 (tty->flip.count >= TTY_FLIPBUF_SIZE)){
585 err = chan->ops->read(chan->fd, &c, chan->data);
587 tty_receive_char(tty, c);
590 if(err == 0) reactivate_fd(chan->fd, irq);
595 line_disable(tty, irq);
600 if(chan->ops->close != NULL)
601 chan->ops->close(chan->fd, chan->data);
606 if(tty) tty_flip_buffer_push(tty);
610 * Overrides for Emacs so that we follow Linus's tabbing style.
611 * Emacs will notice this stuff at the end of the file and automatically
612 * adjust the settings for this buffer only. This must remain at the end
614 * ---------------------------------------------------------------------------
616 * c-file-style: "linux"