lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

tty: rework break handling

Browse Source 
Some hardware needs to do break handling itself and may have partial
support only. Make break_ctl return an error code. Add a tty driver flag
so you can indicate driver hardware side break support.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Alan Cox
2008-07-22 11:18:03 +01:00
committed by Linus Torvalds
parent abbe629ae4
commit 9e98966c7b
20 changed files with 97 additions and 84 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/char/synclink_gt.c
View File

@@ -165,7 +165,7 @@ static int read_proc(char *page, char **start, off_t off, int count,int *eof, v
static int chars_in_buffer(struct tty_struct *tty);
static void throttle(struct tty_struct * tty);
static void unthrottle(struct tty_struct * tty);
static void set_break(struct tty_struct *tty, int break_state);
static int set_break(struct tty_struct *tty, int break_state);
/*
* generic HDLC support and callbacks
@@ -513,7 +513,7 @@ static int wait_mgsl_event(struct slgt_info *info, int __user *mask_ptr);
static int tiocmget(struct tty_struct *tty, struct file *file);
static int tiocmset(struct tty_struct *tty, struct file *file,
unsigned int set, unsigned int clear);
static void set_break(struct tty_struct *tty, int break_state);
static int set_break(struct tty_struct *tty, int break_state);
static int get_interface(struct slgt_info *info, int __user *if_mode);
static int set_interface(struct slgt_info *info, int if_mode);
static int set_gpio(struct slgt_info *info, struct gpio_desc __user *gpio);
@@ -1452,14 +1452,14 @@ static void unthrottle(struct tty_struct * tty)
* set or clear transmit break condition
* break_state -1=set break condition, 0=clear
*/
static void set_break(struct tty_struct *tty, int break_state)
static int set_break(struct tty_struct *tty, int break_state)
{
struct slgt_info *info = tty->driver_data;
unsigned short value;
unsigned long flags;
if (sanity_check(info, tty->name, "set_break"))
return;
return -EINVAL;
DBGINFO(("%s set_break(%d)\n", info->device_name, break_state));
spin_lock_irqsave(&info->lock,flags);
@@ -1470,6 +1470,7 @@ static void set_break(struct tty_struct *tty, int break_state)
value &= ~BIT6;
wr_reg16(info, TCR, value);
spin_unlock_irqrestore(&info->lock,flags);
return 0;
}
#if SYNCLINK_GENERIC_HDLC