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Linux/drivers/staging/nvec/nvec_paz00.c

  1 /*
  2  * nvec_paz00: OEM specific driver for Compal PAZ00 based devices
  3  *
  4  * Copyright (C) 2011 The AC100 Kernel Team <ac100@lists.launchpad.net>
  5  *
  6  * Authors:  Ilya Petrov <ilya.muromec@gmail.com>
  7  *
  8  * This file is subject to the terms and conditions of the GNU General Public
  9  * License.  See the file "COPYING" in the main directory of this archive
 10  * for more details.
 11  *
 12  */
 13 
 14 #include <linux/module.h>
 15 #include <linux/err.h>
 16 #include <linux/slab.h>
 17 #include <linux/leds.h>
 18 #include <linux/platform_device.h>
 19 #include "nvec.h"
 20 
 21 #define to_nvec_led(led_cdev) \
 22         container_of(led_cdev, struct nvec_led, cdev)
 23 
 24 #define NVEC_LED_REQ {'\x0d', '\x10', '\x45', '\x10', '\x00'}
 25 
 26 #define NVEC_LED_MAX 8
 27 
 28 struct nvec_led {
 29         struct led_classdev cdev;
 30         struct nvec_chip *nvec;
 31 };
 32 
 33 static void nvec_led_brightness_set(struct led_classdev *led_cdev,
 34                                     enum led_brightness value)
 35 {
 36         struct nvec_led *led = to_nvec_led(led_cdev);
 37         unsigned char buf[] = NVEC_LED_REQ;
 38 
 39         buf[4] = value;
 40 
 41         nvec_write_async(led->nvec, buf, sizeof(buf));
 42 
 43         led->cdev.brightness = value;
 44 }
 45 
 46 static int nvec_paz00_probe(struct platform_device *pdev)
 47 {
 48         struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
 49         struct nvec_led *led;
 50         int ret = 0;
 51 
 52         led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
 53         if (!led)
 54                 return -ENOMEM;
 55 
 56         led->cdev.max_brightness = NVEC_LED_MAX;
 57 
 58         led->cdev.brightness_set = nvec_led_brightness_set;
 59         led->cdev.name = "paz00-led";
 60         led->cdev.flags |= LED_CORE_SUSPENDRESUME;
 61         led->nvec = nvec;
 62 
 63         platform_set_drvdata(pdev, led);
 64 
 65         ret = devm_led_classdev_register(&pdev->dev, &led->cdev);
 66         if (ret < 0)
 67                 return ret;
 68 
 69         /* to expose the default value to userspace */
 70         led->cdev.brightness = 0;
 71 
 72         return 0;
 73 }
 74 
 75 static struct platform_driver nvec_paz00_driver = {
 76         .probe  = nvec_paz00_probe,
 77         .driver = {
 78                 .name  = "nvec-paz00",
 79         },
 80 };
 81 
 82 module_platform_driver(nvec_paz00_driver);
 83 
 84 MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
 85 MODULE_DESCRIPTION("Tegra NVEC PAZ00 driver");
 86 MODULE_LICENSE("GPL");
 87 MODULE_ALIAS("platform:nvec-paz00");
 88 

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