Input: libps2 - handle 0xfc responses from devices
Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
diff --git a/drivers/input/serio/libps2.c b/drivers/input/serio/libps2.c
index 2b304c2..67248c3 100644
--- a/drivers/input/serio/libps2.c
+++ b/drivers/input/serio/libps2.c
@@ -262,9 +262,17 @@
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 @@
}
- 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 @@
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);
diff --git a/include/linux/libps2.h b/include/linux/libps2.h
index afc4133..b94534b 100644
--- a/include/linux/libps2.h
+++ b/include/linux/libps2.h
@@ -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;