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samsung-laptop: add keyboard backlight support 

Signed-off-by: Corentin Chary <corentincj@iksaif.net>
Acked-by: Greg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: Matthew Garrett <mjg@redhat.com>
This commit is contained in:
Corentin Chary 2011-11-26 11:00:08 +01:00 committed by Matthew Garrett
parent 1c02f2d40a
commit f674ebf1be
2 changed files with 138 additions and 0 deletions
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2
drivers/platform/x86/Kconfig
View File

@ -771,6 +771,8 @@ config SAMSUNG_LAPTOP
depends on X86
depends on RFKILL || RFKILL = n
depends on BACKLIGHT_CLASS_DEVICE
select LEDS_CLASS
select NEW_LEDS
---help---
This module implements a driver for a wide range of different
Samsung laptops. It offers control over the different

136
drivers/platform/x86/samsung-laptop.c
View File

@ -17,6 +17,7 @@
#include <linux/delay.h>
#include <linux/pci.h>
#include <linux/backlight.h>
#include <linux/leds.h>
#include <linux/fb.h>
#include <linux/dmi.h>
#include <linux/platform_device.h>
@ -112,6 +113,9 @@ struct sabi_commands {
u16 get_usb_charge;
u16 set_usb_charge;
/* 0x81 to read, (0x82 | level << 8) to set, 0xaabb to enable */
u16 kbd_backlight;
/*
* Tell the BIOS that Linux is running on this machine.
* 81 is on, 80 is off
@ -171,6 +175,8 @@ static const struct sabi_config sabi_configs[] = {
.get_usb_charge = 0xFFFF,
.set_usb_charge = 0xFFFF,
.kbd_backlight = 0xFFFF,
.set_linux = 0x0a,
},
@ -224,6 +230,8 @@ static const struct sabi_config sabi_configs[] = {
.get_usb_charge = 0x67,
.set_usb_charge = 0x68,
.kbd_backlight = 0x78,
.set_linux = 0xff,
},
@ -290,6 +298,11 @@ struct samsung_laptop {
struct backlight_device *backlight_device;
struct rfkill *rfk;
struct led_classdev kbd_led;
int kbd_led_wk;
struct workqueue_struct *led_workqueue;
struct work_struct kbd_led_work;
struct samsung_laptop_debug debug;
bool handle_backlight;
@ -757,6 +770,122 @@ static int __init samsung_rfkill_init(struct samsung_laptop *samsung)
return 0;
}
static int kbd_backlight_enable(struct samsung_laptop *samsung)
{
const struct sabi_commands *commands = &samsung->config->commands;
struct sabi_data data;
int retval;
if (commands->kbd_backlight == 0xFFFF)
return -ENODEV;
memset(&data, 0, sizeof(data));
data.d0 = 0xaabb;
retval = sabi_command(samsung, commands->kbd_backlight,
&data, &data);
if (retval)
return retval;
if (data.d0 != 0xccdd)
return -ENODEV;
return 0;
}
static int kbd_backlight_read(struct samsung_laptop *samsung)
{
const struct sabi_commands *commands = &samsung->config->commands;
struct sabi_data data;
int retval;
memset(&data, 0, sizeof(data));
data.data[0] = 0x81;
retval = sabi_command(samsung, commands->kbd_backlight,
&data, &data);
if (retval)
return retval;
return data.data[0];
}
static int kbd_backlight_write(struct samsung_laptop *samsung, int brightness)
{
const struct sabi_commands *commands = &samsung->config->commands;
struct sabi_data data;
memset(&data, 0, sizeof(data));
data.d0 = 0x82 | ((brightness & 0xFF) << 8);
return sabi_command(samsung, commands->kbd_backlight,
&data, NULL);
}
static void kbd_led_update(struct work_struct *work)
{
struct samsung_laptop *samsung;
samsung = container_of(work, struct samsung_laptop, kbd_led_work);
kbd_backlight_write(samsung, samsung->kbd_led_wk);
}
static void kbd_led_set(struct led_classdev *led_cdev,
enum led_brightness value)
{
struct samsung_laptop *samsung;
samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
if (value > samsung->kbd_led.max_brightness)
value = samsung->kbd_led.max_brightness;
else if (value < 0)
value = 0;
samsung->kbd_led_wk = value;
queue_work(samsung->led_workqueue, &samsung->kbd_led_work);
}
static enum led_brightness kbd_led_get(struct led_classdev *led_cdev)
{
struct samsung_laptop *samsung;
samsung = container_of(led_cdev, struct samsung_laptop, kbd_led);
return kbd_backlight_read(samsung);
}
static void samsung_leds_exit(struct samsung_laptop *samsung)
{
if (!IS_ERR_OR_NULL(samsung->kbd_led.dev))
led_classdev_unregister(&samsung->kbd_led);
if (samsung->led_workqueue)
destroy_workqueue(samsung->led_workqueue);
}
static int __init samsung_leds_init(struct samsung_laptop *samsung)
{
int ret = 0;
samsung->led_workqueue = create_singlethread_workqueue("led_workqueue");
if (!samsung->led_workqueue)
return -ENOMEM;
if (kbd_backlight_enable(samsung) >= 0) {
INIT_WORK(&samsung->kbd_led_work, kbd_led_update);
samsung->kbd_led.name = "samsung::kbd_backlight";
samsung->kbd_led.brightness_set = kbd_led_set;
samsung->kbd_led.brightness_get = kbd_led_get;
samsung->kbd_led.max_brightness = 8;
ret = led_classdev_register(&samsung->platform_device->dev,
&samsung->kbd_led);
}
if (ret)
samsung_leds_exit(samsung);
return ret;
}
static void samsung_backlight_exit(struct samsung_laptop *samsung)
{
if (samsung->backlight_device) {
@ -1366,6 +1495,10 @@ static int __init samsung_init(void)
if (ret)
goto error_rfkill;
ret = samsung_leds_init(samsung);
if (ret)
goto error_leds;
ret = samsung_debugfs_init(samsung);
if (ret)
goto error_debugfs;
@ -1374,6 +1507,8 @@ static int __init samsung_init(void)
return ret;
error_debugfs:
samsung_leds_exit(samsung);
error_leds:
samsung_rfkill_exit(samsung);
error_rfkill:
samsung_backlight_exit(samsung);
@ -1395,6 +1530,7 @@ static void __exit samsung_exit(void)
samsung = platform_get_drvdata(samsung_platform_device);
samsung_debugfs_exit(samsung);
samsung_leds_exit(samsung);
samsung_rfkill_exit(samsung);
samsung_backlight_exit(samsung);
samsung_sysfs_exit(samsung);