text: /*
   * nvec_paz00: OEM specific driver for Compal PAZ00 based devices
   *
   * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net>
   *
   * Authors:  Ilya Petrov <ilya.muromec@gmail.com>
   *
   * This file is subject to the terms and conditions of the GNU General Public
   * License.  See the file "COPYING" in the main directory of this archive
   * for more details.
   *
   */
  
  #include <linux/module.h>
  #include <linux/err.h>
  #include <linux/slab.h>
  #include <linux/leds.h>
  #include <linux/platform_device.h>
  #include "nvec.h"
  
  #define to_nvec_led(led_cdev) \
  	container_of(led_cdev, struct nvec_led, cdev)
  
  #define NVEC_LED_REQ {'\x0d', '\x10', '\x45', '\x10', '\x00'}
  
  #define NVEC_LED_MAX 8
  
  struct nvec_led {
  	struct led_classdev cdev;
  	struct nvec_chip *nvec;
  };
  
  static void nvec_led_brightness_set(struct led_classdev *led_cdev,
  				    enum led_brightness value)
  {
  	struct nvec_led *led = to_nvec_led(led_cdev);
  	unsigned char buf[] = NVEC_LED_REQ;
  	buf[4] = value;
  
  	nvec_write_async(led->nvec, buf, sizeof(buf));
  
  	led->cdev.brightness = value;
  
  }
  
  static int __devinit nvec_paz00_probe(struct platform_device *pdev)
  {
  	struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
  	struct nvec_led *led;
  	int ret = 0;
  
  	led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
  	if (led == NULL)
  		return -ENOMEM;
  
  	led->cdev.max_brightness = NVEC_LED_MAX;
  
  	led->cdev.brightness_set = nvec_led_brightness_set;
  	led->cdev.name = "paz00-led";
  	led->cdev.flags |= LED_CORE_SUSPENDRESUME;
  	led->nvec = nvec;
  
  	platform_set_drvdata(pdev, led);
  
  	ret = led_classdev_register(&pdev->dev, &led->cdev);
  	if (ret < 0)
  		return ret;
  
  	/* to expose the default value to userspace */
  	led->cdev.brightness = 0;
  
  	return 0;
  }
  
  static int __devexit nvec_paz00_remove(struct platform_device *pdev)
  {
  	struct nvec_led *led = platform_get_drvdata(pdev);
  
  	led_classdev_unregister(&led->cdev);
  
  	return 0;
  }
  
  static struct platform_driver nvec_paz00_driver = {
  	.probe  = nvec_paz00_probe,
  	.remove = __devexit_p(nvec_paz00_remove),
  	.driver = {
  		.name  = "nvec-paz00",
  		.owner = THIS_MODULE,
  	},
  };
  
  module_platform_driver(nvec_paz00_driver);
  
  MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
  MODULE_DESCRIPTION("Tegra NVEC PAZ00 driver");
  MODULE_LICENSE("GPL");
  MODULE_ALIAS("platform:nvec-paz00");
  