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authorRoland Scheidegger <sroland@tungstengraphics.com>2007-05-08 01:31:40 -0400
committerDmitry Torokhov <dtor@insightbb.com>2007-05-08 01:31:40 -0400
commitd2ada5597d33a9108acb2caf912f85cbc9caab1e (patch)
treec8fe7ebaf381f6874e768b21f978bff887137852 /drivers
parent334d0dd8b660557608142f0f77abc6812b48f08b (diff)
Input: i8042 - fix AUX port detection with some chips
The i8042 driver fails detection of the AUX port with some chips, because they apparently do not change the I8042_CTR_AUXDIS bit immediately. This is known to affect at least HP500/HP510 notebooks, consequently the built-in touchpad will not work. The patch will simply reread the value until it gets the expected value or a retry limit is hit, without touching other workaround code in the same area. Signed-off-by: Roland Scheidegger <sroland@tungstengraphics.com> Signed-off-by: Dmitry Torokhov <dtor@mail.ru>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/input/serio/i8042.c35
1 files changed, 29 insertions, 6 deletions
diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
index 7c17377a65b..3888dc307e0 100644
--- a/drivers/input/serio/i8042.c
+++ b/drivers/input/serio/i8042.c
@@ -526,6 +526,33 @@ static irqreturn_t __devinit i8042_aux_test_irq(int irq, void *dev_id)
return IRQ_HANDLED;
}
+/*
+ * i8042_toggle_aux - enables or disables AUX port on i8042 via command and
+ * verifies success by readinng CTR. Used when testing for presence of AUX
+ * port.
+ */
+static int __devinit i8042_toggle_aux(int on)
+{
+ unsigned char param;
+ int i;
+
+ if (i8042_command(&param,
+ on ? I8042_CMD_AUX_ENABLE : I8042_CMD_AUX_DISABLE))
+ return -1;
+
+ /* some chips need some time to set the I8042_CTR_AUXDIS bit */
+ for (i = 0; i < 100; i++) {
+ udelay(50);
+
+ if (i8042_command(&param, I8042_CMD_CTL_RCTR))
+ return -1;
+
+ if (!(param & I8042_CTR_AUXDIS) == on)
+ return 0;
+ }
+
+ return -1;
+}
/*
* i8042_check_aux() applies as much paranoia as it can at detecting
@@ -580,16 +607,12 @@ static int __devinit i8042_check_aux(void)
* Bit assignment test - filters out PS/2 i8042's in AT mode
*/
- if (i8042_command(&param, I8042_CMD_AUX_DISABLE))
- return -1;
- if (i8042_command(&param, I8042_CMD_CTL_RCTR) || (~param & I8042_CTR_AUXDIS)) {
+ if (i8042_toggle_aux(0)) {
printk(KERN_WARNING "Failed to disable AUX port, but continuing anyway... Is this a SiS?\n");
printk(KERN_WARNING "If AUX port is really absent please use the 'i8042.noaux' option.\n");
}
- if (i8042_command(&param, I8042_CMD_AUX_ENABLE))
- return -1;
- if (i8042_command(&param, I8042_CMD_CTL_RCTR) || (param & I8042_CTR_AUXDIS))
+ if (i8042_toggle_aux(1))
return -1;
/*