crbkpx_backlight

diff -uNr linux-3.9-rc6/drivers/leds/Kconfig linux-3.9-rc6-CrBkPx/drivers/leds/Kconfig
--- linux-3.9-rc6/drivers/leds/Kconfig  2013-04-08 12:49:54.000000000 +0900
+++ linux-3.9-rc6-CrBkPx/drivers/leds/Kconfig   2013-04-11 15:30:40.964012115 +0900
@@ -24,6 +24,13 @@

 comment "LED drivers"

+config LEDS_CHROMEOS_KEYBOARD
+   tristate "LED support for Chrome OS keyboards"
+   depends on LEDS_CLASS && ACPI
+   help
+     This option enables support for the LEDs on Chrome OS keyboards.
+     Say Y to enable keyboard LEDs on Chrome OS systems.
+
 config LEDS_88PM860X
    tristate "LED Support for Marvell 88PM860x PMIC"
    depends on LEDS_CLASS
diff -uNr linux-3.9-rc6/drivers/leds/leds-chromeos-keyboard.c linux-3.9-rc6-CrBkPx/drivers/leds/leds-chromeos-keyboard.c
--- linux-3.9-rc6/drivers/leds/leds-chromeos-keyboard.c 1970-01-01 09:00:00.000000000 +0900
+++ linux-3.9-rc6-CrBkPx/drivers/leds/leds-chromeos-keyboard.c  2013-04-11 15:30:00.116013092 +0900
@@ -0,0 +1,120 @@
+/*
+ *  leds-chromeos-keyboard.c - Keyboard backlight LED driver for Chrome OS.
+ *
+ *  Copyright (C) 2012 Google, Inc.
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ *
+ */
+
+#include <linux/acpi.h>
+#include <linux/leds.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+
+/* Keyboard LED ACPI Device must be defined in firmware */
+#define ACPI_KEYBOARD_BACKLIGHT_DEVICE "\\_SB.KBLT"
+#define ACPI_KEYBOARD_BACKLIGHT_READ   ACPI_KEYBOARD_BACKLIGHT_DEVICE ".KBQC"
+#define ACPI_KEYBOARD_BACKLIGHT_WRITE  ACPI_KEYBOARD_BACKLIGHT_DEVICE ".KBCM"
+
+#define ACPI_KEYBOARD_BACKLIGHT_MAX        100
+
+static void keyboard_led_set_brightness(struct led_classdev *cdev,
+   enum led_brightness brightness)
+{
+   union acpi_object param;
+   struct acpi_object_list input;
+   acpi_status status;
+
+   if (!(cdev->flags & LED_SUSPENDED))
+       cdev->brightness = brightness;
+
+   param.type = ACPI_TYPE_INTEGER;
+   param.integer.value = brightness;
+   input.count = 1;
+   input.pointer = &param;
+
+   status = acpi_evaluate_object(NULL, ACPI_KEYBOARD_BACKLIGHT_WRITE,
+                     &input, NULL);
+   if (ACPI_FAILURE(status))
+       dev_err(cdev->dev, "Error setting keyboard LED value");
+}
+
+static int keyboard_led_probe(struct platform_device *pdev)
+{
+   struct led_classdev *cdev;
+   acpi_handle handle;
+   acpi_status status;
+   int ret;
+
+   /* Look for the keyboard LED ACPI Device */
+   status = acpi_get_handle(ACPI_ROOT_OBJECT,
+                ACPI_KEYBOARD_BACKLIGHT_DEVICE,
+                &handle);
+   if (ACPI_FAILURE(status)) {
+       dev_err(&pdev->dev, "Unable fo find ACPI device %s\n",
+           ACPI_KEYBOARD_BACKLIGHT_DEVICE);
+       return -ENODEV;
+   }
+
+   cdev = kzalloc(sizeof(struct led_classdev), GFP_KERNEL);
+   if (!cdev)
+       return -ENOMEM;
+   cdev->name = "chromeos::kbd_backlight";
+   cdev->brightness_set = keyboard_led_set_brightness;
+   cdev->max_brightness = ACPI_KEYBOARD_BACKLIGHT_MAX;
+   cdev->brightness = cdev->max_brightness;
+   cdev->flags |= LED_CORE_SUSPENDRESUME;
+
+   ret = led_classdev_register(&pdev->dev, cdev);
+   if (ret)
+       goto err;
+
+   platform_set_drvdata(pdev, cdev);
+   return 0;
+err:
+   kfree(cdev);
+   return ret;
+}
+
+static int keyboard_led_remove(struct platform_device *pdev)
+{
+   struct led_classdev *cdev = platform_get_drvdata(pdev);
+
+   platform_set_drvdata(pdev, NULL);
+   kfree(cdev);
+   return 0;
+}
+
+static struct platform_driver keyboard_led_driver = {
+   .driver     = {
+       .name   = "chromeos-keyboard-leds",
+       .owner  = THIS_MODULE,
+   },
+   .probe      = keyboard_led_probe,
+   .remove     = keyboard_led_remove,
+};
+
+module_platform_driver(keyboard_led_driver);
+
+MODULE_AUTHOR("Simon Que <sque@chromium.org>");
+MODULE_DESCRIPTION("ChromeOS Keyboard LED Driver");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:chromeos-keyboard-leds");
diff -uNr linux-3.9-rc6/drivers/leds/Makefile linux-3.9-rc6-CrBkPx/drivers/leds/Makefile
--- linux-3.9-rc6/drivers/leds/Makefile 2013-04-08 12:49:54.000000000 +0900
+++ linux-3.9-rc6-CrBkPx/drivers/leds/Makefile  2013-04-11 15:31:06.124011514 +0900
@@ -52,6 +52,7 @@
 obj-$(CONFIG_LEDS_MAX8997)     += leds-max8997.o
 obj-$(CONFIG_LEDS_LM355x)      += leds-lm355x.o
 obj-$(CONFIG_LEDS_BLINKM)      += leds-blinkm.o
+obj-$(CONFIG_LEDS_CHROMEOS_KEYBOARD)   += leds-chromeos-keyboard.o

 # LED SPI Drivers
 obj-$(CONFIG_LEDS_DAC124S085)      += leds-dac124s085.o
diff -uNr linux-3.9-rc6/drivers/tty/sysrq.c linux-3.9-rc6-CrBkPx/drivers/tty/sysrq.c
--- linux-3.9-rc6/drivers/tty/sysrq.c   2013-04-08 12:49:54.000000000 +0900
+++ linux-3.9-rc6-CrBkPx/drivers/tty/sysrq.c    2013-04-11 15:37:39.332002111 +0900
@@ -693,6 +693,7 @@
        }
        break;

+   case KEY_F10:
    case KEY_SYSRQ:
        if (value == 1 && sysrq->alt != KEY_RESERVED) {
            sysrq->active = true;