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path: root/drivers/input/serio/i8042.c
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Diffstat (limited to 'drivers/input/serio/i8042.c')
-rw-r--r--drivers/input/serio/i8042.c18
1 files changed, 11 insertions, 7 deletions
diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index d365f227ac56..debe9445488c 100644
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -322,23 +322,27 @@ static irqreturn_t i8042_interrupt(int irq, void *dev_id)
dfl = 0;
if (str & I8042_STR_MUXERR) {
dbg("MUX error, status is %02x, data is %02x", str, data);
- switch (data) {
- default:
/*
* When MUXERR condition is signalled the data register can only contain
* 0xfd, 0xfe or 0xff if implementation follows the spec. Unfortunately
- * it is not always the case. Some KBC just get confused which port the
- * data came from and signal error leaving the data intact. They _do not_
- * revert to legacy mode (actually I've never seen KBC reverting to legacy
- * mode yet, when we see one we'll add proper handling).
- * Anyway, we will assume that the data came from the same serio last byte
+ * it is not always the case. Some KBCs also report 0xfc when there is
+ * nothing connected to the port while others sometimes get confused which
+ * port the data came from and signal error leaving the data intact. They
+ * _do not_ revert to legacy mode (actually I've never seen KBC reverting
+ * to legacy mode yet, when we see one we'll add proper handling).
+ * Anyway, we process 0xfc, 0xfd, 0xfe and 0xff as timeouts, and for the
+ * rest assume that the data came from the same serio last byte
* was transmitted (if transmission happened not too long ago).
*/
+
+ switch (data) {
+ default:
if (time_before(jiffies, last_transmit + HZ/10)) {
str = last_str;
break;
}
/* fall through - report timeout */
+ case 0xfc:
case 0xfd:
case 0xfe: dfl = SERIO_TIMEOUT; data = 0xfe; break;
case 0xff: dfl = SERIO_PARITY; data = 0xfe; break;