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ACPI: thinkpad-acpi: add brightness_force parameter

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Add a "brightness_enable" module parameter that allows the local admin to
force the backlight support to not be enabled.

It can also be used to force the backlight support to be enabled, but that
is currently a no-op as the backlight support is enabled by default when
available.  This will be changed by a different patch.

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Henrique de Moraes Holschuh
2007-10-30 18:02:07 -02:00
committed by Len Brown
parent a3f104c02a
commit 87cc537a54
3 changed files with 14 additions and 0 deletions
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9
drivers/misc/thinkpad_acpi.c
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@@ -3182,6 +3182,12 @@ static int __init brightness_init(struct ibm_init_struct *iibm)
mutex_init(&brightness_mutex);
if (!brightness_enable) {
dbg_printk(TPACPI_DBG_INIT,
"brightness support disabled by module parameter\n");
return 1;
}
if (!brightness_mode) {
if (thinkpad_id.vendor == PCI_VENDOR_ID_LENOVO)
brightness_mode = 2;
@@ -4803,6 +4809,9 @@ module_param_named(fan_control, fan_control_allowed, bool, 0);
static int brightness_mode;
module_param_named(brightness_mode, brightness_mode, int, 0);
static unsigned int brightness_enable = 2; /* 2 = auto, 0 = no, 1 = yes */
module_param(brightness_enable, uint, 0);
static unsigned int hotkey_report_mode;
module_param(hotkey_report_mode, uint, 0);