1 From 2c5ccde448ae5f4062802bcd6002f856acbd268f Mon Sep 17 00:00:00 2001
2 From: Arjan van de Ven <arjan@linux.intel.com>
3 Date: Tue, 3 Feb 2009 16:26:16 -0800
4 Subject: [PATCH] input: introduce a tougher i8042.reset
6 Some bad touchpads don't reset right the first time (MSI Wind U-100 for
7 example). This patch will retry the reset up to 5 times.
9 In addition, this patch also adds a module parameter to not treat
10 reset failures as fatal to the usage of the device. This prevents
11 a touchpad failure from also disabling the keyboard....
13 Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
15 Documentation/kernel-parameters.txt | 2 ++
16 drivers/input/serio/i8042.c | 33 ++++++++++++++++++++++++---------
17 2 files changed, 26 insertions(+), 9 deletions(-)
19 diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
20 index ac613a6..a43e3bd 100644
21 --- a/Documentation/kernel-parameters.txt
22 +++ b/Documentation/kernel-parameters.txt
23 @@ -855,6 +855,8 @@ and is between 256 and 4096 characters. It is defined in the file
24 [HW] Frequency with which keyboard LEDs should blink
25 when kernel panics (default is 0.5 sec)
26 i8042.reset [HW] Reset the controller during init and cleanup
27 + i8042.nonfatal [HW] Don't treat i8042.reset failures as fatal for the
28 + device initialization.
29 i8042.unlock [HW] Unlock (ignore) the keylock
32 diff --git a/drivers/input/serio/i8042.c b/drivers/input/serio/i8042.c
33 index 170f71e..2473a9a 100644
34 --- a/drivers/input/serio/i8042.c
35 +++ b/drivers/input/serio/i8042.c
36 @@ -47,6 +47,10 @@ static unsigned int i8042_reset;
37 module_param_named(reset, i8042_reset, bool, 0);
38 MODULE_PARM_DESC(reset, "Reset controller during init and cleanup.");
40 +static unsigned int i8042_nonfatal;
41 +module_param_named(nonfatal, i8042_nonfatal, bool, 0);
42 +MODULE_PARM_DESC(reset, "Treat controller test failures as non-fatal.");
44 static unsigned int i8042_direct;
45 module_param_named(direct, i8042_direct, bool, 0);
46 MODULE_PARM_DESC(direct, "Put keyboard port into non-translated mode.");
47 @@ -712,22 +716,33 @@ static int i8042_controller_check(void)
48 static int i8042_controller_selftest(void)
56 - if (i8042_command(¶m, I8042_CMD_CTL_TEST)) {
57 - printk(KERN_ERR "i8042.c: i8042 controller self test timeout.\n");
61 + * We try this 5 times; on some really fragile systems this does not
62 + * take the first time...
66 + if (i8042_command(¶m, I8042_CMD_CTL_TEST)) {
67 + printk(KERN_ERR "i8042.c: i8042 controller self test timeout.\n");
71 + if (param == I8042_RET_CTL_TEST)
74 - if (param != I8042_RET_CTL_TEST) {
75 printk(KERN_ERR "i8042.c: i8042 controller selftest failed. (%#x != %#x)\n",
76 - param, I8042_RET_CTL_TEST);
79 + param, I8042_RET_CTL_TEST);