diff options
| author | Alan Cox <alan@redhat.com> | 2008-07-03 17:39:52 +1000 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2008-07-03 17:39:52 +1000 |
| commit | 0a0192feb7da576d6dbd893a3804df1e85a20697 (patch) | |
| tree | b28b4117239f0de1da657a77327b1309c38fec2d /include | |
| parent | b70e076c07df7b1edf2803c2862c525de165c9e4 (diff) | |
77-tty-break-errorhandler
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/tty_driver.h | 14 |
1 files changed, 12 insertions, 2 deletions
diff --git a/include/linux/tty_driver.h b/include/linux/tty_driver.h index d2a003586761..e1065ac0d922 100644 --- a/include/linux/tty_driver.h +++ b/include/linux/tty_driver.h @@ -135,7 +135,7 @@ * * Optional: * - * void (*break_ctl)(struct tty_stuct *tty, int state); + * int (*break_ctl)(struct tty_stuct *tty, int state); * * This optional routine requests the tty driver to turn on or * off BREAK status on the RS-232 port. If state is -1, @@ -146,6 +146,10 @@ * handle the following ioctls: TCSBRK, TCSBRKP, TIOCSBRK, * TIOCCBRK. * + * If the driver sets TTY_DRIVER_HARDWARE_BREAK then the interface + * will also be called with actual times and the hardware is expected + * to do the delay work itself. 0 and -1 are still used for on/off. + * * Optional: Required for TCSBRK/BRKP/etc handling. * * void (*wait_until_sent)(struct tty_struct *tty, int timeout); @@ -192,7 +196,7 @@ struct tty_operations { void (*stop)(struct tty_struct *tty); void (*start)(struct tty_struct *tty); void (*hangup)(struct tty_struct *tty); - void (*break_ctl)(struct tty_struct *tty, int state); + int (*break_ctl)(struct tty_struct *tty, int state); void (*flush_buffer)(struct tty_struct *tty); void (*set_ldisc)(struct tty_struct *tty); void (*wait_until_sent)(struct tty_struct *tty, int timeout); @@ -285,12 +289,18 @@ extern struct tty_driver *tty_find_polling_driver(char *name, int *line); * TTY_DRIVER_DEVPTS_MEM -- don't use the standard arrays, instead * use dynamic memory keyed through the devpts filesystem. This * is only applicable to the pty driver. + * + * TTY_DRIVER_HARDWARE_BREAK -- hardware handles break signals. Pass + * the requested timeout to the caller instead of using a simple + * on/off interface. + * */ #define TTY_DRIVER_INSTALLED 0x0001 #define TTY_DRIVER_RESET_TERMIOS 0x0002 #define TTY_DRIVER_REAL_RAW 0x0004 #define TTY_DRIVER_DYNAMIC_DEV 0x0008 #define TTY_DRIVER_DEVPTS_MEM 0x0010 +#define TTY_DRIVER_HARDWARE_BREAK 0x0020 /* tty driver types */ #define TTY_DRIVER_TYPE_SYSTEM 0x0001 |