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authorDmitry Torokhov <dtor@insightbb.com>2006-10-11 01:44:28 -0400
committerDmitry Torokhov <dtor@insightbb.com>2006-10-11 01:44:28 -0400
commit817e6ba3623de9cdc66c6aba90eae30b5588ff11 (patch)
tree64a0a47b13edb21ccabe42a66528c85f3b648c8a /drivers/input/serio
parent80fc9f532d8c05d4cb12d55660624ce53a378349 (diff)
Input: i8042 - supress ACK/NAKs when blinking during panic
This allows using SysRq and not fill logs with complaints from atkbd. Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers/input/serio')
-rw-r--r--drivers/input/serio/i8042.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index 09b06e605b5..7e3141f37e3 100644
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -106,6 +106,7 @@ static unsigned char i8042_ctr;
static unsigned char i8042_mux_present;
static unsigned char i8042_kbd_irq_registered;
static unsigned char i8042_aux_irq_registered;
+static unsigned char i8042_suppress_kbd_ack;
static struct platform_device *i8042_platform_device;
static irqreturn_t i8042_interrupt(int irq, void *dev_id);
@@ -316,7 +317,7 @@ static irqreturn_t i8042_interrupt(int irq, void *dev_id)
unsigned char str, data;
unsigned int dfl;
unsigned int port_no;
- int ret;
+ int ret = 1;
spin_lock_irqsave(&i8042_lock, flags);
str = i8042_read_status();
@@ -378,10 +379,16 @@ static irqreturn_t i8042_interrupt(int irq, void *dev_id)
dfl & SERIO_PARITY ? ", bad parity" : "",
dfl & SERIO_TIMEOUT ? ", timeout" : "");
+ if (unlikely(i8042_suppress_kbd_ack))
+ if (port_no == I8042_KBD_PORT_NO &&
+ (data == 0xfa || data == 0xfe)) {
+ i8042_suppress_kbd_ack = 0;
+ goto out;
+ }
+
if (likely(port->exists))
serio_interrupt(port->serio, data, dfl);
- ret = 1;
out:
return IRQ_RETVAL(ret);
}
@@ -842,11 +849,13 @@ static long i8042_panic_blink(long count)
led ^= 0x01 | 0x04;
while (i8042_read_status() & I8042_STR_IBF)
DELAY;
+ i8042_suppress_kbd_ack = 1;
i8042_write_data(0xed); /* set leds */
DELAY;
while (i8042_read_status() & I8042_STR_IBF)
DELAY;
DELAY;
+ i8042_suppress_kbd_ack = 1;
i8042_write_data(led);
DELAY;
last_blink = count;