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Commit f674ebf1 authored by Corentin Chary's avatar Corentin Chary Committed by Matthew Garrett
Browse files

samsung-laptop: add keyboard backlight support 



Signed-off-by: default avatarCorentin Chary <corentincj@iksaif.net>
Acked-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
Signed-off-by: default avatarMatthew Garrett <mjg@redhat.com>
parent 1c02f2d4

drivers/platform/x86/Kconfig

+2 −0
Original line number Diff line number Diff line
@@ -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

drivers/platform/x86/samsung-laptop.c

+136 −0
Original line number Diff line number Diff line
@@ -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);