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authorHenrique de Moraes Holschuh <hmh@hmh.eng.br>2007-10-30 18:02:07 -0200
committerLen Brown <len.brown@intel.com>2007-11-05 13:07:11 -0500
commit87cc537a54fc017d998cf603f5fab9ca4a85d668 (patch)
treee69421b6f749853f2d9444c3f458b260eb503d4f /drivers/misc
parenta3f104c02ab842574e699186cf953551aafe2ca9 (diff)
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>
Diffstat (limited to 'drivers/misc')
-rw-r--r--drivers/misc/thinkpad_acpi.c9
-rw-r--r--drivers/misc/thinkpad_acpi.h1
2 files changed, 10 insertions, 0 deletions
diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c
index 322ba25b479..56a21e6b80a 100644
--- a/drivers/misc/thinkpad_acpi.c
+++ b/drivers/misc/thinkpad_acpi.c
@@ -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);
diff --git a/drivers/misc/thinkpad_acpi.h b/drivers/misc/thinkpad_acpi.h
index 8ca19c33372..8fba2bbe345 100644
--- a/drivers/misc/thinkpad_acpi.h
+++ b/drivers/misc/thinkpad_acpi.h
@@ -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);