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tty: Document defunct ASYNC_* bits in uapi header 

Note the serial_struct flags for which the kernel ignores and performs
no action. The flags cannot be removed since they form part of the
userspace interface via the TIOCSSERIAL/TIOCGSERIAL ioctls.

Signed-off-by: Peter Hurley <peter@hurleysoftware.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Peter Hurley 2014-10-16 16:54:22 -04:00 committed by Greg Kroah-Hartman
parent 904326ecac
commit 352f86187e
1 changed files with 5 additions and 4 deletions
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9
include/uapi/linux/tty_flags.h
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@ -8,6 +8,7 @@
* Define ASYNCB_* for convenient use with {test,set,clear}_bit.
*
* Bits [0..ASYNCB_LAST_USER] are userspace defined/visible/changeable
* [x] in the bit comments indicates the flag is defunct and no longer used.
*/
#define ASYNCB_HUP_NOTIFY 0 /* Notify getty on hangups and closes
* on the callout port */
@ -19,15 +20,15 @@
#define ASYNCB_SKIP_TEST 6 /* Skip UART test during autoconfiguration */
#define ASYNCB_AUTO_IRQ 7 /* Do automatic IRQ during
* autoconfiguration */
#define ASYNCB_SESSION_LOCKOUT 8 /* Lock out cua opens based on session */
#define ASYNCB_PGRP_LOCKOUT 9 /* Lock out cua opens based on pgrp */
#define ASYNCB_CALLOUT_NOHUP 10 /* Don't do hangups for cua device */
#define ASYNCB_SESSION_LOCKOUT 8 /* [x] Lock out cua opens based on session */
#define ASYNCB_PGRP_LOCKOUT 9 /* [x] Lock out cua opens based on pgrp */
#define ASYNCB_CALLOUT_NOHUP 10 /* [x] Don't do hangups for cua device */
#define ASYNCB_HARDPPS_CD 11 /* Call hardpps when CD goes high */
#define ASYNCB_SPD_SHI 12 /* Use 230400 instead of 38400 bps */
#define ASYNCB_LOW_LATENCY 13 /* Request low latency behaviour */
#define ASYNCB_BUGGY_UART 14 /* This is a buggy UART, skip some safety
* checks. Note: can be dangerous! */
#define ASYNCB_AUTOPROBE 15 /* Port was autoprobed by PCI or PNP code */
#define ASYNCB_AUTOPROBE 15 /* [x] Port was autoprobed by PCI/PNP code */
#define ASYNCB_MAGIC_MULTIPLIER 16 /* Use special CLK or divisor */
#define ASYNCB_LAST_USER 16