From: Corentin Chary Date: Sat, 26 Nov 2011 10:00:08 +0000 (+0100) Subject: samsung-laptop: add keyboard backlight support X-Git-Tag: firefly_0821_release~3680^2~3224^2~56 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=f674ebf1be4a19454549602ec8e6e7294bf9d60d;p=firefly-linux-kernel-4.4.55.git samsung-laptop: add keyboard backlight support Signed-off-by: Corentin Chary Acked-by: Greg Kroah-Hartman Signed-off-by: Matthew Garrett --- diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 1906fc4762de..912ffef0f148 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -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 diff --git a/drivers/platform/x86/samsung-laptop.c b/drivers/platform/x86/samsung-laptop.c index b8d2145981e0..fd0ebedc86e2 100644 --- a/drivers/platform/x86/samsung-laptop.c +++ b/drivers/platform/x86/samsung-laptop.c @@ -17,6 +17,7 @@ #include #include #include +#include #include #include #include @@ -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);