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ACPI: thinkpad-acpi: add brightness_force parameter 

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>
hifive-unleashed-5.1
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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4
Documentation/thinkpad-acpi.txt
View File

@ -944,6 +944,10 @@ When display backlight brightness controls are available through the
standard ACPI interface, it is best to use it instead of this direct
ThinkPad-specific interface.
The brightness_enable module parameter can be used to control whether
the LCD brightness control feature will be enabled when available.
brightness_enable=0 forces it to be disabled.
Procfs notes:
The available commands are:

9
drivers/misc/thinkpad_acpi.c
View File

@ -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);

1
drivers/misc/thinkpad_acpi.h
View File

@ -339,6 +339,7 @@ static int bluetooth_write(char *buf);
static struct backlight_device *ibm_backlight_device;
static int brightness_offset = 0x31;
static int brightness_mode;
static unsigned int brightness_enable; /* 0 = no, 1 = yes, 2 = auto */
static int brightness_init(struct ibm_init_struct *iibm);
static void brightness_exit(void);