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asus-wmi: add keyboard backlight support 

Based on a patch from Nate Weibley. <nweibley@gmail.com>.

Cc: Nate Weibley <nweibley@gmail.com>
Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Corentin Chary 2011-07-01 11:34:31 +02:00 committed by Matthew Garrett
parent 57d5c8e742
commit e9809c0b96
1 changed files with 113 additions and 17 deletions
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130
drivers/platform/x86/asus-wmi.c
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@ -66,6 +66,8 @@ MODULE_LICENSE("GPL");
#define NOTIFY_BRNUP_MAX 0x1f
#define NOTIFY_BRNDOWN_MIN 0x20
#define NOTIFY_BRNDOWN_MAX 0x2e
#define NOTIFY_KBD_BRTUP 0xc4
#define NOTIFY_KBD_BRTDWN 0xc5
/* WMI Methods */
#define ASUS_WMI_METHODID_SPEC 0x43455053 /* BIOS SPECification */
@ -174,8 +176,11 @@ struct asus_wmi {
struct led_classdev tpd_led;
int tpd_led_wk;
struct led_classdev kbd_led;
int kbd_led_wk;
struct workqueue_struct *led_workqueue;
struct work_struct tpd_led_work;
struct work_struct kbd_led_work;
struct asus_rfkill wlan;
struct asus_rfkill bluetooth;
@ -360,30 +365,79 @@ static enum led_brightness tpd_led_get(struct led_classdev *led_cdev)
return read_tpd_led_state(asus);
}
static int asus_wmi_led_init(struct asus_wmi *asus)
static void kbd_led_update(struct work_struct *work)
{
int rv;
int ctrl_param = 0;
struct asus_wmi *asus;
if (read_tpd_led_state(asus) < 0)
return 0;
asus = container_of(work, struct asus_wmi, kbd_led_work);
asus->led_workqueue = create_singlethread_workqueue("led_workqueue");
if (!asus->led_workqueue)
return -ENOMEM;
INIT_WORK(&asus->tpd_led_work, tpd_led_update);
/*
* bits 0-2: level
* bit 7: light on/off
*/
if (asus->kbd_led_wk > 0)
ctrl_param = 0x80 | (asus->kbd_led_wk & 0x7F);
asus->tpd_led.name = "asus::touchpad";
asus->tpd_led.brightness_set = tpd_led_set;
asus->tpd_led.brightness_get = tpd_led_get;
asus->tpd_led.max_brightness = 1;
asus_wmi_set_devstate(ASUS_WMI_DEVID_KBD_BACKLIGHT, ctrl_param, NULL);
}
rv = led_classdev_register(&asus->platform_device->dev, &asus->tpd_led);
if (rv) {
destroy_workqueue(asus->led_workqueue);
return rv;
static int kbd_led_read(struct asus_wmi *asus, int *level, int *env)
{
int retval;
/*
* bits 0-2: level
* bit 7: light on/off
* bit 8-10: environment (0: dark, 1: normal, 2: light)
* bit 17: status unknown
*/
retval = asus_wmi_get_devstate_bits(asus, ASUS_WMI_DEVID_KBD_BACKLIGHT,
0xFFFF);
if (retval == 0x8000)
retval = -ENODEV;
if (retval >= 0) {
if (level)
*level = retval & 0x80 ? retval & 0x7F : 0;
if (env)
*env = (retval >> 8) & 0x7F;
retval = 0;
}
return 0;
return retval;
}
static void kbd_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct asus_wmi *asus;
asus = container_of(led_cdev, struct asus_wmi, kbd_led);
if (value > asus->kbd_led.max_brightness)
value = asus->kbd_led.max_brightness;
else if (value < 0)
value = 0;
asus->kbd_led_wk = value;
queue_work(asus->led_workqueue, &asus->kbd_led_work);
}
static enum led_brightness kbd_led_get(struct led_classdev *led_cdev)
{
struct asus_wmi *asus;
int retval, value;
asus = container_of(led_cdev, struct asus_wmi, kbd_led);
retval = kbd_led_read(asus, &value, NULL);
if (retval < 0)
return retval;
return value;
}
static void asus_wmi_led_exit(struct asus_wmi *asus)
@ -394,6 +448,48 @@ static void asus_wmi_led_exit(struct asus_wmi *asus)
destroy_workqueue(asus->led_workqueue);
}
static int asus_wmi_led_init(struct asus_wmi *asus)
{
int rv = 0;
asus->led_workqueue = create_singlethread_workqueue("led_workqueue");
if (!asus->led_workqueue)
return -ENOMEM;
if (read_tpd_led_state(asus) >= 0) {
INIT_WORK(&asus->tpd_led_work, tpd_led_update);
asus->tpd_led.name = "asus::touchpad";
asus->tpd_led.brightness_set = tpd_led_set;
asus->tpd_led.brightness_get = tpd_led_get;
asus->tpd_led.max_brightness = 1;
rv = led_classdev_register(&asus->platform_device->dev,
&asus->tpd_led);
if (rv)
goto error;
}
if (kbd_led_read(asus, NULL, NULL) >= 0) {
INIT_WORK(&asus->kbd_led_work, kbd_led_update);
asus->kbd_led.name = "asus::kbd_backlight";
asus->kbd_led.brightness_set = kbd_led_set;
asus->kbd_led.brightness_get = kbd_led_get;
asus->kbd_led.max_brightness = 3;
rv = led_classdev_register(&asus->platform_device->dev,
&asus->kbd_led);
}
error:
if (rv)
asus_wmi_led_exit(asus);
return rv;
}
/*
* PCI hotplug (for wlan rfkill)
*/