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Date: Sat, 26 Nov 2011 11:00:08 +0100
From: Corentin Chary <corentincj@...aif.net>
To: platform-driver-x86@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...e.de>,
Matthew Garrett <mjg@...hat.com>,
Corentin Chary <corentincj@...aif.net>,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 11/16] samsung-laptop: add keyboard backlight support
Signed-off-by: Corentin Chary <corentincj@...aif.net>
---
drivers/platform/x86/Kconfig | 2 +
drivers/platform/x86/samsung-laptop.c | 136 +++++++++++++++++++++++++++++++++
2 files changed, 138 insertions(+), 0 deletions(-)
diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
index ec13bc5..1d89c3a 100644
--- a/drivers/platform/x86/Kconfig
+++ b/drivers/platform/x86/Kconfig
@@ -747,6 +747,8 @@ config SAMSUNG_LAPTOP
depends on X86
depends on RFKILL || RFKILL = n
depends 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 d7cbee9..4a46a7b 100644
--- a/drivers/platform/x86/samsung-laptop.c
+++ b/drivers/platform/x86/samsung-laptop.c
@@ -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);
--
1.7.5.4
--
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