diff options
Diffstat (limited to 'drivers/input/serio/i8042.c')
| -rw-r--r-- | drivers/input/serio/i8042.c | 18 |
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; |