forked from luck/tmp_suning_uos_patched
f28169d200
I noticed that errors happening while hotplugging devices from the host were never returned back to the mconsole client. In some cases, success was returned instead of even an information-free error. This patch cleans that up by having the low-level configuration code pass back an error string along with an error code. At the top level, which knows whether it is early boot time or responding to an mconsole request, the string is printk'd or returned to the mconsole client. There are also whitespace and trivial code cleanups in the surrounding code. Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
115 lines
3.3 KiB
C
115 lines
3.3 KiB
C
/*
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* Copyright (C) 2001, 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#ifndef __LINE_H__
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#define __LINE_H__
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#include "linux/list.h"
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#include "linux/workqueue.h"
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#include "linux/tty.h"
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#include "linux/interrupt.h"
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#include "linux/spinlock.h"
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#include "linux/mutex.h"
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#include "chan_user.h"
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#include "mconsole_kern.h"
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struct line_driver {
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char *name;
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char *device_name;
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short major;
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short minor_start;
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short type;
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short subtype;
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int read_irq;
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char *read_irq_name;
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int write_irq;
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char *write_irq_name;
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char *symlink_from;
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char *symlink_to;
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struct mc_device mc;
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};
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struct line {
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struct tty_struct *tty;
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spinlock_t count_lock;
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int valid;
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struct mutex open_mutex;
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char *init_str;
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int init_pri;
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struct list_head chan_list;
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/*This lock is actually, mostly, local to*/
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spinlock_t lock;
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int throttled;
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/* Yes, this is a real circular buffer.
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* XXX: And this should become a struct kfifo!
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*
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* buffer points to a buffer allocated on demand, of length
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* LINE_BUFSIZE, head to the start of the ring, tail to the end.*/
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char *buffer;
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char *head;
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char *tail;
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int sigio;
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struct delayed_work task;
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const struct line_driver *driver;
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int have_irq;
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};
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#define LINE_INIT(str, d) \
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{ .count_lock = SPIN_LOCK_UNLOCKED, \
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.init_str = str, \
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.init_pri = INIT_STATIC, \
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.valid = 1, \
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.lock = SPIN_LOCK_UNLOCKED, \
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.driver = d }
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struct lines {
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int num;
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};
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#define LINES_INIT(n) { .num = n }
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extern void line_close(struct tty_struct *tty, struct file * filp);
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extern int line_open(struct line *lines, struct tty_struct *tty);
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extern int line_setup(struct line *lines, unsigned int sizeof_lines,
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char *init, char **error_out);
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extern int line_write(struct tty_struct *tty, const unsigned char *buf,
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int len);
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extern void line_put_char(struct tty_struct *tty, unsigned char ch);
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extern void line_set_termios(struct tty_struct *tty, struct ktermios * old);
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extern int line_chars_in_buffer(struct tty_struct *tty);
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extern void line_flush_buffer(struct tty_struct *tty);
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extern void line_flush_chars(struct tty_struct *tty);
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extern int line_write_room(struct tty_struct *tty);
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extern int line_ioctl(struct tty_struct *tty, struct file * file,
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unsigned int cmd, unsigned long arg);
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extern void line_throttle(struct tty_struct *tty);
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extern void line_unthrottle(struct tty_struct *tty);
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extern char *add_xterm_umid(char *base);
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extern int line_setup_irq(int fd, int input, int output, struct line *line,
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void *data);
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extern void line_close_chan(struct line *line);
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extern struct tty_driver * line_register_devfs(struct lines *set,
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struct line_driver *line_driver,
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const struct tty_operations *driver,
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struct line *lines, int nlines);
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extern void lines_init(struct line *lines, int nlines, struct chan_opts *opts);
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extern void close_lines(struct line *lines, int nlines);
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extern int line_config(struct line *lines, unsigned int sizeof_lines,
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char *str, const struct chan_opts *opts,
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char **error_out);
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extern int line_id(char **str, int *start_out, int *end_out);
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extern int line_remove(struct line *lines, unsigned int sizeof_lines, int n,
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char **error_out);
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extern int line_get_config(char *dev, struct line *lines,
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unsigned int sizeof_lines, char *str,
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int size, char **error_out);
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#endif
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