drivers/staging/nvec/nvec_paz00.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * nvec_paz00: OEM specific driver for Compal PAZ00 based devices
   4  *
   5  * Copyright (C) 2011 The AC100 Kernel Team <[email protected]>
   6  *
   7  * Authors:  Ilya Petrov <[email protected]>
   8  */
   9
  10 #include <linux/module.h>
  11 #include <linux/err.h>
  12 #include <linux/slab.h>
  13 #include <linux/leds.h>
  14 #include <linux/platform_device.h>
  15 #include "nvec.h"
  16
  17 #define NVEC_LED_REQ {'\x0d', '\x10', '\x45', '\x10', '\x00'}
  18
  19 #define NVEC_LED_MAX 8
  20
  21 struct nvec_led {
  22         struct led_classdev cdev;
  23         struct nvec_chip *nvec;
  24 };
  25
  26 static void nvec_led_brightness_set(struct led_classdev *led_cdev,
  27                                     enum led_brightness value)
  28 {
  29         struct nvec_led *led = container_of(led_cdev, struct nvec_led, cdev);
  30         unsigned char buf[] = NVEC_LED_REQ;
  31
  32         buf[4] = value;
  33
  34         nvec_write_async(led->nvec, buf, sizeof(buf));
  35
  36         led->cdev.brightness = value;
  37 }
  38
  39 static int nvec_paz00_probe(struct platform_device *pdev)
  40 {
  41         struct nvec_chip *nvec = dev_get_drvdata(pdev->dev.parent);
  42         struct nvec_led *led;
  43         int ret = 0;
  44
  45         led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
  46         if (!led)
  47                 return -ENOMEM;
  48
  49         led->cdev.max_brightness = NVEC_LED_MAX;
  50
  51         led->cdev.brightness_set = nvec_led_brightness_set;
  52         led->cdev.name = "paz00-led";
  53         led->cdev.flags |= LED_CORE_SUSPENDRESUME;
  54         led->nvec = nvec;
  55
  56         platform_set_drvdata(pdev, led);
  57
  58         ret = devm_led_classdev_register(&pdev->dev, &led->cdev);
  59         if (ret < 0)
  60                 return ret;
  61
  62         /* to expose the default value to userspace */
  63         led->cdev.brightness = 0;
  64
  65         return 0;
  66 }
  67
  68 static struct platform_driver nvec_paz00_driver = {
  69         .probe  = nvec_paz00_probe,
  70         .driver = {
  71                 .name  = "nvec-paz00",
  72         },
  73 };
  74
  75 module_platform_driver(nvec_paz00_driver);
  76
  77 MODULE_AUTHOR("Ilya Petrov <[email protected]>");
  78 MODULE_DESCRIPTION("Tegra NVEC PAZ00 driver");
  79 MODULE_LICENSE("GPL");
  80 MODULE_ALIAS("platform:nvec-paz00");