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Input: libps2 - handle 0xfc responses from devices

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Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
This commit is contained in:
Dmitry Torokhov 2008-11-19 17:02:24 -05:00
parent 3eb1aa43ef
commit a2d781fc8d
2 changed files with 18 additions and 4 deletions
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20
drivers/input/serio/libps2.c
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@ -262,9 +262,17 @@ int ps2_handle_ack(struct ps2dev *ps2dev, unsigned char data)
break;
case PS2_RET_NAK:
ps2dev->nak = 1;
ps2dev->flags |= PS2_FLAG_NAK;
ps2dev->nak = PS2_RET_NAK;
break;
case PS2_RET_ERR:
if (ps2dev->flags & PS2_FLAG_NAK) {
ps2dev->flags &= ~PS2_FLAG_NAK;
ps2dev->nak = PS2_RET_ERR;
break;
}
/*
* Workaround for mice which don't ACK the Get ID command.
* These are valid mouse IDs that we recognize.
@ -282,8 +290,11 @@ int ps2_handle_ack(struct ps2dev *ps2dev, unsigned char data)
}
if (!ps2dev->nak && ps2dev->cmdcnt)
ps2dev->flags |= PS2_FLAG_CMD | PS2_FLAG_CMD1;
if (!ps2dev->nak) {
ps2dev->flags &= ~PS2_FLAG_NAK;
if (ps2dev->cmdcnt)
ps2dev->flags |= PS2_FLAG_CMD | PS2_FLAG_CMD1;
}
ps2dev->flags &= ~PS2_FLAG_ACK;
wake_up(&ps2dev->wait);
@ -329,6 +340,7 @@ void ps2_cmd_aborted(struct ps2dev *ps2dev)
if (ps2dev->flags & (PS2_FLAG_ACK | PS2_FLAG_CMD))
wake_up(&ps2dev->wait);
ps2dev->flags = 0;
/* reset all flags except last nack */
ps2dev->flags &= PS2_FLAG_NAK;
}
EXPORT_SYMBOL(ps2_cmd_aborted);

2
include/linux/libps2.h
View file

@ -18,11 +18,13 @@
#define PS2_RET_ID 0x00
#define PS2_RET_ACK 0xfa
#define PS2_RET_NAK 0xfe
#define PS2_RET_ERR 0xfc
#define PS2_FLAG_ACK 1 /* Waiting for ACK/NAK */
#define PS2_FLAG_CMD 2 /* Waiting for command to finish */
#define PS2_FLAG_CMD1 4 /* Waiting for the first byte of command response */
#define PS2_FLAG_WAITID 8 /* Command execiting is GET ID */
#define PS2_FLAG_NAK 16 /* Last transmission was NAKed */
struct ps2dev {
struct serio *serio;