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authorHans de Goede <hdegoede@redhat.com>2019-10-26 22:24:32 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2019-10-28 15:40:26 +0100
commit593681e2c75f59f23cf6f6cefc4f00cae2a4522b (patch)
tree15fc5d61e8bb1484391629c5f2ff6145317866a4 /drivers/acpi/button.c
parent065bd4d35b3fb4484c61fc40a51eeffd5abe52e8 (diff)
ACPI: button: Allow disabling LID support with the lid_init_state module option
Add a new "disabled" value for the lid_init_state module option, which can be used to disable LID support on devices where it is completely broken. Sometimes devices seem to spontaneously suspend and the cause for this is not clear. The LID switch is known to be one possible cause for this, this commit allows easily disabling the LID switch for testing if it is the cause. For example some devices which do not even have a lid, still have a LID device in their ACPI tables, pointing to a floating GPIO. This is not really related to the initial LID state, but re-using the existing option keeps things simple and it will make it much easier to add DMI quirks which can either disable the LID completely or set another non-default lid_init_state value, both of which are necessary on some devices. Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/button.c')
-rw-r--r--drivers/acpi/button.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/acpi/button.c b/drivers/acpi/button.c
index 121d747a840c..7f69d8d1905b 100644
--- a/drivers/acpi/button.c
+++ b/drivers/acpi/button.c
@@ -48,12 +48,14 @@ enum {
ACPI_BUTTON_LID_INIT_IGNORE,
ACPI_BUTTON_LID_INIT_OPEN,
ACPI_BUTTON_LID_INIT_METHOD,
+ ACPI_BUTTON_LID_INIT_DISABLED,
};
static const char * const lid_init_state_str[] = {
[ACPI_BUTTON_LID_INIT_IGNORE] = "ignore",
[ACPI_BUTTON_LID_INIT_OPEN] = "open",
[ACPI_BUTTON_LID_INIT_METHOD] = "method",
+ [ACPI_BUTTON_LID_INIT_DISABLED] = "disabled",
};
#define _COMPONENT ACPI_BUTTON_COMPONENT
@@ -480,7 +482,9 @@ static int acpi_button_add(struct acpi_device *device)
char *name, *class;
int error;
- if (!strcmp(hid, ACPI_BUTTON_HID_LID) && dmi_check_system(lid_blacklst))
+ if (!strcmp(hid, ACPI_BUTTON_HID_LID) &&
+ (dmi_check_system(lid_blacklst) ||
+ lid_init_state == ACPI_BUTTON_LID_INIT_DISABLED))
return -ENODEV;
button = kzalloc(sizeof(struct acpi_button), GFP_KERNEL);