586 lines
13 KiB
C
586 lines
13 KiB
C
/*
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* Copyright (C) 2000, 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#include <linux/stddef.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/tty.h>
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#include <linux/string.h>
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#include <linux/tty_flip.h>
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#include <asm/irq.h>
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#include "chan_kern.h"
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#include "user_util.h"
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#include "kern.h"
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#include "irq_user.h"
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#include "sigio.h"
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#include "line.h"
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#include "os.h"
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#ifdef CONFIG_NOCONFIG_CHAN
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/* The printk's here are wrong because we are complaining that there is no
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* output device, but printk is printing to that output device. The user will
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* never see the error. printf would be better, except it can't run on a
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* kernel stack because it will overflow it.
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* Use printk for now since that will avoid crashing.
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*/
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static void *not_configged_init(char *str, int device, struct chan_opts *opts)
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{
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printk(KERN_ERR "Using a channel type which is configured out of "
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"UML\n");
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return(NULL);
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}
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static int not_configged_open(int input, int output, int primary, void *data,
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char **dev_out)
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{
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printk(KERN_ERR "Using a channel type which is configured out of "
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"UML\n");
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return(-ENODEV);
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}
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static void not_configged_close(int fd, void *data)
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{
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printk(KERN_ERR "Using a channel type which is configured out of "
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"UML\n");
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}
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static int not_configged_read(int fd, char *c_out, void *data)
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{
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printk(KERN_ERR "Using a channel type which is configured out of "
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"UML\n");
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return(-EIO);
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}
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static int not_configged_write(int fd, const char *buf, int len, void *data)
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{
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printk(KERN_ERR "Using a channel type which is configured out of "
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"UML\n");
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return(-EIO);
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}
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static int not_configged_console_write(int fd, const char *buf, int len,
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void *data)
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{
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printk(KERN_ERR "Using a channel type which is configured out of "
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"UML\n");
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return(-EIO);
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}
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static int not_configged_window_size(int fd, void *data, unsigned short *rows,
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unsigned short *cols)
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{
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printk(KERN_ERR "Using a channel type which is configured out of "
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"UML\n");
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return(-ENODEV);
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}
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static void not_configged_free(void *data)
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{
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printf(KERN_ERR "Using a channel type which is configured out of "
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"UML\n");
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}
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static struct chan_ops not_configged_ops = {
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.init = not_configged_init,
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.open = not_configged_open,
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.close = not_configged_close,
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.read = not_configged_read,
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.write = not_configged_write,
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.console_write = not_configged_console_write,
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.window_size = not_configged_window_size,
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.free = not_configged_free,
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.winch = 0,
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};
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#endif /* CONFIG_NOCONFIG_CHAN */
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void generic_close(int fd, void *unused)
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{
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os_close_file(fd);
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}
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int generic_read(int fd, char *c_out, void *unused)
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{
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int n;
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n = os_read_file(fd, c_out, sizeof(*c_out));
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if(n == -EAGAIN)
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return(0);
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else if(n == 0)
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return(-EIO);
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return(n);
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}
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/* XXX Trivial wrapper around os_write_file */
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int generic_write(int fd, const char *buf, int n, void *unused)
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{
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return(os_write_file(fd, buf, n));
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}
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int generic_window_size(int fd, void *unused, unsigned short *rows_out,
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unsigned short *cols_out)
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{
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int rows, cols;
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int ret;
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ret = os_window_size(fd, &rows, &cols);
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if(ret < 0)
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return(ret);
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ret = ((*rows_out != rows) || (*cols_out != cols));
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*rows_out = rows;
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*cols_out = cols;
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return(ret);
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}
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void generic_free(void *data)
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{
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kfree(data);
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}
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static void tty_receive_char(struct tty_struct *tty, char ch)
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{
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if(tty == NULL) return;
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if(I_IXON(tty) && !I_IXOFF(tty) && !tty->raw) {
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if(ch == STOP_CHAR(tty)){
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stop_tty(tty);
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return;
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}
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else if(ch == START_CHAR(tty)){
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start_tty(tty);
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return;
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}
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}
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if((tty->flip.flag_buf_ptr == NULL) ||
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(tty->flip.char_buf_ptr == NULL))
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return;
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tty_insert_flip_char(tty, ch, TTY_NORMAL);
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}
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static int open_one_chan(struct chan *chan, int input, int output, int primary)
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{
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int fd;
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if(chan->opened) return(0);
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if(chan->ops->open == NULL) fd = 0;
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else fd = (*chan->ops->open)(input, output, primary, chan->data,
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&chan->dev);
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if(fd < 0) return(fd);
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chan->fd = fd;
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chan->opened = 1;
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return(0);
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}
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int open_chan(struct list_head *chans)
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{
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struct list_head *ele;
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struct chan *chan;
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int ret, err = 0;
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list_for_each(ele, chans){
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chan = list_entry(ele, struct chan, list);
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ret = open_one_chan(chan, chan->input, chan->output,
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chan->primary);
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if(chan->primary) err = ret;
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}
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return(err);
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}
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void chan_enable_winch(struct list_head *chans, struct tty_struct *tty)
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{
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struct list_head *ele;
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struct chan *chan;
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list_for_each(ele, chans){
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chan = list_entry(ele, struct chan, list);
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if(chan->primary && chan->output && chan->ops->winch){
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register_winch(chan->fd, tty);
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return;
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}
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}
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}
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void enable_chan(struct list_head *chans, struct tty_struct *tty)
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{
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struct list_head *ele;
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struct chan *chan;
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list_for_each(ele, chans){
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chan = list_entry(ele, struct chan, list);
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if(!chan->opened) continue;
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line_setup_irq(chan->fd, chan->input, chan->output, tty);
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}
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}
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void close_chan(struct list_head *chans)
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{
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struct chan *chan;
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/* Close in reverse order as open in case more than one of them
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* refers to the same device and they save and restore that device's
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* state. Then, the first one opened will have the original state,
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* so it must be the last closed.
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*/
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list_for_each_entry_reverse(chan, chans, list) {
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if(!chan->opened) continue;
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if(chan->ops->close != NULL)
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(*chan->ops->close)(chan->fd, chan->data);
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chan->opened = 0;
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chan->fd = -1;
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}
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}
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int write_chan(struct list_head *chans, const char *buf, int len,
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int write_irq)
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{
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struct list_head *ele;
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struct chan *chan = NULL;
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int n, ret = 0;
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list_for_each(ele, chans) {
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chan = list_entry(ele, struct chan, list);
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if (!chan->output || (chan->ops->write == NULL))
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continue;
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n = chan->ops->write(chan->fd, buf, len, chan->data);
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if (chan->primary) {
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ret = n;
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if ((ret == -EAGAIN) || ((ret >= 0) && (ret < len)))
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reactivate_fd(chan->fd, write_irq);
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}
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}
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return(ret);
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}
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int console_write_chan(struct list_head *chans, const char *buf, int len)
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{
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struct list_head *ele;
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struct chan *chan;
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int n, ret = 0;
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list_for_each(ele, chans){
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chan = list_entry(ele, struct chan, list);
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if(!chan->output || (chan->ops->console_write == NULL))
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continue;
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n = chan->ops->console_write(chan->fd, buf, len, chan->data);
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if(chan->primary) ret = n;
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}
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return(ret);
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}
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int console_open_chan(struct line *line, struct console *co, struct chan_opts *opts)
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{
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if (!list_empty(&line->chan_list))
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return 0;
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if (0 != parse_chan_pair(line->init_str, &line->chan_list,
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line->init_pri, co->index, opts))
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return -1;
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if (0 != open_chan(&line->chan_list))
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return -1;
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printk("Console initialized on /dev/%s%d\n",co->name,co->index);
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return 0;
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}
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int chan_window_size(struct list_head *chans, unsigned short *rows_out,
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unsigned short *cols_out)
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{
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struct list_head *ele;
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struct chan *chan;
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list_for_each(ele, chans){
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chan = list_entry(ele, struct chan, list);
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if(chan->primary){
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if(chan->ops->window_size == NULL) return(0);
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return(chan->ops->window_size(chan->fd, chan->data,
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rows_out, cols_out));
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}
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}
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return(0);
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}
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void free_one_chan(struct chan *chan)
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{
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list_del(&chan->list);
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if(chan->ops->free != NULL)
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(*chan->ops->free)(chan->data);
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free_irq_by_fd(chan->fd);
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if(chan->primary && chan->output) ignore_sigio_fd(chan->fd);
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kfree(chan);
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}
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void free_chan(struct list_head *chans)
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{
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struct list_head *ele, *next;
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struct chan *chan;
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list_for_each_safe(ele, next, chans){
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chan = list_entry(ele, struct chan, list);
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free_one_chan(chan);
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}
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}
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static int one_chan_config_string(struct chan *chan, char *str, int size,
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char **error_out)
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{
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int n = 0;
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if(chan == NULL){
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CONFIG_CHUNK(str, size, n, "none", 1);
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return(n);
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}
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CONFIG_CHUNK(str, size, n, chan->ops->type, 0);
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if(chan->dev == NULL){
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CONFIG_CHUNK(str, size, n, "", 1);
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return(n);
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}
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CONFIG_CHUNK(str, size, n, ":", 0);
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CONFIG_CHUNK(str, size, n, chan->dev, 0);
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return(n);
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}
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static int chan_pair_config_string(struct chan *in, struct chan *out,
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char *str, int size, char **error_out)
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{
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int n;
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n = one_chan_config_string(in, str, size, error_out);
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str += n;
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size -= n;
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if(in == out){
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CONFIG_CHUNK(str, size, n, "", 1);
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return(n);
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}
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CONFIG_CHUNK(str, size, n, ",", 1);
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n = one_chan_config_string(out, str, size, error_out);
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str += n;
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size -= n;
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CONFIG_CHUNK(str, size, n, "", 1);
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return(n);
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}
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int chan_config_string(struct list_head *chans, char *str, int size,
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char **error_out)
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{
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struct list_head *ele;
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struct chan *chan, *in = NULL, *out = NULL;
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list_for_each(ele, chans){
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chan = list_entry(ele, struct chan, list);
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if(!chan->primary)
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continue;
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if(chan->input)
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in = chan;
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if(chan->output)
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out = chan;
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}
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return(chan_pair_config_string(in, out, str, size, error_out));
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}
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struct chan_type {
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char *key;
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struct chan_ops *ops;
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};
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struct chan_type chan_table[] = {
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{ "fd", &fd_ops },
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#ifdef CONFIG_NULL_CHAN
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{ "null", &null_ops },
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#else
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{ "null", ¬_configged_ops },
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#endif
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#ifdef CONFIG_PORT_CHAN
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{ "port", &port_ops },
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#else
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{ "port", ¬_configged_ops },
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#endif
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#ifdef CONFIG_PTY_CHAN
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{ "pty", &pty_ops },
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{ "pts", &pts_ops },
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#else
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{ "pty", ¬_configged_ops },
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{ "pts", ¬_configged_ops },
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#endif
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#ifdef CONFIG_TTY_CHAN
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{ "tty", &tty_ops },
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#else
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{ "tty", ¬_configged_ops },
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#endif
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#ifdef CONFIG_XTERM_CHAN
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{ "xterm", &xterm_ops },
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#else
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{ "xterm", ¬_configged_ops },
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#endif
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};
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static struct chan *parse_chan(char *str, int pri, int device,
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struct chan_opts *opts)
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{
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struct chan_type *entry;
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struct chan_ops *ops;
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struct chan *chan;
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void *data;
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int i;
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ops = NULL;
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data = NULL;
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for(i = 0; i < sizeof(chan_table)/sizeof(chan_table[0]); i++){
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entry = &chan_table[i];
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if(!strncmp(str, entry->key, strlen(entry->key))){
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ops = entry->ops;
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str += strlen(entry->key);
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break;
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}
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}
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if(ops == NULL){
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printk(KERN_ERR "parse_chan couldn't parse \"%s\"\n",
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str);
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return(NULL);
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}
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if(ops->init == NULL) return(NULL);
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data = (*ops->init)(str, device, opts);
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if(data == NULL) return(NULL);
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chan = kmalloc(sizeof(*chan), GFP_KERNEL);
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if(chan == NULL) return(NULL);
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*chan = ((struct chan) { .list = LIST_HEAD_INIT(chan->list),
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.primary = 1,
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.input = 0,
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.output = 0,
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.opened = 0,
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.fd = -1,
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.pri = pri,
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.ops = ops,
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.data = data });
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return(chan);
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}
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int parse_chan_pair(char *str, struct list_head *chans, int pri, int device,
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struct chan_opts *opts)
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{
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struct chan *new, *chan;
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char *in, *out;
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if(!list_empty(chans)){
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chan = list_entry(chans->next, struct chan, list);
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if(chan->pri >= pri) return(0);
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free_chan(chans);
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INIT_LIST_HEAD(chans);
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}
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out = strchr(str, ',');
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if(out != NULL){
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in = str;
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*out = '\0';
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out++;
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new = parse_chan(in, pri, device, opts);
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if(new == NULL) return(-1);
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new->input = 1;
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list_add(&new->list, chans);
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new = parse_chan(out, pri, device, opts);
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if(new == NULL) return(-1);
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list_add(&new->list, chans);
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new->output = 1;
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}
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else {
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new = parse_chan(str, pri, device, opts);
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if(new == NULL) return(-1);
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list_add(&new->list, chans);
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new->input = 1;
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new->output = 1;
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}
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return(0);
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}
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int chan_out_fd(struct list_head *chans)
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{
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struct list_head *ele;
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struct chan *chan;
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list_for_each(ele, chans){
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chan = list_entry(ele, struct chan, list);
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if(chan->primary && chan->output)
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return(chan->fd);
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}
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return(-1);
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}
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void chan_interrupt(struct list_head *chans, struct work_struct *task,
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struct tty_struct *tty, int irq)
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{
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struct list_head *ele, *next;
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struct chan *chan;
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int err;
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char c;
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list_for_each_safe(ele, next, chans){
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chan = list_entry(ele, struct chan, list);
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if(!chan->input || (chan->ops->read == NULL)) continue;
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do {
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if((tty != NULL) &&
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(tty->flip.count >= TTY_FLIPBUF_SIZE)){
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schedule_work(task);
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goto out;
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}
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err = chan->ops->read(chan->fd, &c, chan->data);
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if(err > 0)
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tty_receive_char(tty, c);
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} while(err > 0);
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if(err == 0) reactivate_fd(chan->fd, irq);
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if(err == -EIO){
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if(chan->primary){
|
|
if(tty != NULL)
|
|
tty_hangup(tty);
|
|
line_disable(tty, irq);
|
|
close_chan(chans);
|
|
free_chan(chans);
|
|
return;
|
|
}
|
|
else {
|
|
if(chan->ops->close != NULL)
|
|
chan->ops->close(chan->fd, chan->data);
|
|
free_one_chan(chan);
|
|
}
|
|
}
|
|
}
|
|
out:
|
|
if(tty) tty_flip_buffer_push(tty);
|
|
}
|
|
|
|
/*
|
|
* Overrides for Emacs so that we follow Linus's tabbing style.
|
|
* Emacs will notice this stuff at the end of the file and automatically
|
|
* adjust the settings for this buffer only. This must remain at the end
|
|
* of the file.
|
|
* ---------------------------------------------------------------------------
|
|
* Local variables:
|
|
* c-file-style: "linux"
|
|
* End:
|
|
*/
|