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
)
314 if (!list_empty(&line
->chan_list
))
317 if (0 != parse_chan_pair(line
->init_str
, &line
->chan_list
,
318 line
->init_pri
, co
->index
, opts
))
320 if (0 != open_chan(&line
->chan_list
))
322 printk("Console initialized on /dev/%s%d\n",co
->name
,co
->index
);
326 int chan_window_size(struct list_head
*chans
, unsigned short *rows_out
,
327 unsigned short *cols_out
)
329 struct list_head
*ele
;
332 list_for_each(ele
, chans
){
333 chan
= list_entry(ele
, struct chan
, list
);
335 if(chan
->ops
->window_size
== NULL
)
337 return chan
->ops
->window_size(chan
->fd
, chan
->data
,
344 void free_one_chan(struct chan
*chan
)
346 list_del(&chan
->list
);
347 if(chan
->ops
->free
!= NULL
)
348 (*chan
->ops
->free
)(chan
->data
);
349 free_irq_by_fd(chan
->fd
);
350 if(chan
->primary
&& chan
->output
) ignore_sigio_fd(chan
->fd
);
354 void free_chan(struct list_head
*chans
)
356 struct list_head
*ele
, *next
;
359 list_for_each_safe(ele
, next
, chans
){
360 chan
= list_entry(ele
, struct chan
, list
);
365 static int one_chan_config_string(struct chan
*chan
, char *str
, int size
,
371 CONFIG_CHUNK(str
, size
, n
, "none", 1);
375 CONFIG_CHUNK(str
, size
, n
, chan
->ops
->type
, 0);
377 if(chan
->dev
== NULL
){
378 CONFIG_CHUNK(str
, size
, n
, "", 1);
382 CONFIG_CHUNK(str
, size
, n
, ":", 0);
383 CONFIG_CHUNK(str
, size
, n
, chan
->dev
, 0);
388 static int chan_pair_config_string(struct chan
*in
, struct chan
*out
,
389 char *str
, int size
, char **error_out
)
393 n
= one_chan_config_string(in
, str
, size
, error_out
);
398 CONFIG_CHUNK(str
, size
, n
, "", 1);
402 CONFIG_CHUNK(str
, size
, n
, ",", 1);
403 n
= one_chan_config_string(out
, str
, size
, error_out
);
406 CONFIG_CHUNK(str
, size
, n
, "", 1);
411 int chan_config_string(struct list_head
*chans
, char *str
, int size
,
414 struct list_head
*ele
;
415 struct chan
*chan
, *in
= NULL
, *out
= NULL
;
417 list_for_each(ele
, chans
){
418 chan
= list_entry(ele
, struct chan
, list
);
427 return chan_pair_config_string(in
, out
, str
, size
, error_out
);
432 struct chan_ops
*ops
;
435 struct chan_type chan_table
[] = {
438 #ifdef CONFIG_NULL_CHAN
439 { "null", &null_ops
},
441 { "null", ¬_configged_ops
},
444 #ifdef CONFIG_PORT_CHAN
445 { "port", &port_ops
},
447 { "port", ¬_configged_ops
},
450 #ifdef CONFIG_PTY_CHAN
454 { "pty", ¬_configged_ops
},
455 { "pts", ¬_configged_ops
},
458 #ifdef CONFIG_TTY_CHAN
461 { "tty", ¬_configged_ops
},
464 #ifdef CONFIG_XTERM_CHAN
465 { "xterm", &xterm_ops
},
467 { "xterm", ¬_configged_ops
},
471 static struct chan
*parse_chan(char *str
, int pri
, int device
,
472 struct chan_opts
*opts
)
474 struct chan_type
*entry
;
475 struct chan_ops
*ops
;
482 for(i
= 0; i
< sizeof(chan_table
)/sizeof(chan_table
[0]); i
++){
483 entry
= &chan_table
[i
];
484 if(!strncmp(str
, entry
->key
, strlen(entry
->key
))){
486 str
+= strlen(entry
->key
);
491 my_printf("parse_chan couldn't parse \"%s\"\n",
495 if(ops
->init
== NULL
)
497 data
= (*ops
->init
)(str
, device
, opts
);
501 chan
= kmalloc(sizeof(*chan
), GFP_ATOMIC
);
504 *chan
= ((struct chan
) { .list
= LIST_HEAD_INIT(chan
->list
),
516 int parse_chan_pair(char *str
, struct list_head
*chans
, int pri
, int device
,
517 struct chan_opts
*opts
)
519 struct chan
*new, *chan
;
522 if(!list_empty(chans
)){
523 chan
= list_entry(chans
->next
, struct chan
, list
);
527 INIT_LIST_HEAD(chans
);
530 out
= strchr(str
, ',');
535 new = parse_chan(in
, pri
, device
, opts
);
540 list_add(&new->list
, chans
);
542 new = parse_chan(out
, pri
, device
, opts
);
546 list_add(&new->list
, chans
);
550 new = parse_chan(str
, pri
, device
, opts
);
554 list_add(&new->list
, chans
);
561 int chan_out_fd(struct list_head
*chans
)
563 struct list_head
*ele
;
566 list_for_each(ele
, chans
){
567 chan
= list_entry(ele
, struct chan
, list
);
568 if(chan
->primary
&& chan
->output
)
574 void chan_interrupt(struct list_head
*chans
, struct work_struct
*task
,
575 struct tty_struct
*tty
, int irq
)
577 struct list_head
*ele
, *next
;
582 list_for_each_safe(ele
, next
, chans
){
583 chan
= list_entry(ele
, struct chan
, list
);
584 if(!chan
->input
|| (chan
->ops
->read
== NULL
)) continue;
587 (tty
->flip
.count
>= TTY_FLIPBUF_SIZE
)){
591 err
= chan
->ops
->read(chan
->fd
, &c
, chan
->data
);
593 tty_receive_char(tty
, c
);
596 if(err
== 0) reactivate_fd(chan
->fd
, irq
);
601 line_disable(tty
, irq
);
607 if(chan
->ops
->close
!= NULL
)
608 chan
->ops
->close(chan
->fd
, chan
->data
);
614 if(tty
) tty_flip_buffer_push(tty
);
618 * Overrides for Emacs so that we follow Linus's tabbing style.
619 * Emacs will notice this stuff at the end of the file and automatically
620 * adjust the settings for this buffer only. This must remain at the end
622 * ---------------------------------------------------------------------------
624 * c-file-style: "linux"