LXR linux/drivers/leds/leds-tps6105x.c

   1// SPDX-License-Identifier: GPL-2.0-only
   2/*
   3 * Copyright (C) 2019 Sven Van Asbroeck
   4 */
   5
   6#include <linux/leds.h>
   7#include <linux/module.h>
   8#include <linux/platform_device.h>
   9#include <linux/mfd/tps6105x.h>
  10#include <linux/regmap.h>
  11
  12struct tps6105x_priv {
  13        struct regmap *regmap;
  14        struct led_classdev cdev;
  15        struct fwnode_handle *fwnode;
  16};
  17
  18static void tps6105x_handle_put(void *data)
  19{
  20        struct tps6105x_priv *priv = data;
  21
  22        fwnode_handle_put(priv->fwnode);
  23}
  24
  25static int tps6105x_brightness_set(struct led_classdev *cdev,
  26                                  enum led_brightness brightness)
  27{
  28        struct tps6105x_priv *priv = container_of(cdev, struct tps6105x_priv,
  29                                                        cdev);
  30
  31        return regmap_update_bits(priv->regmap, TPS6105X_REG_0,
  32                                  TPS6105X_REG0_TORCHC_MASK,
  33                                  brightness << TPS6105X_REG0_TORCHC_SHIFT);
  34}
  35
  36static int tps6105x_led_probe(struct platform_device *pdev)
  37{
  38        struct tps6105x *tps6105x = dev_get_platdata(&pdev->dev);
  39        struct tps6105x_platform_data *pdata = tps6105x->pdata;
  40        struct led_init_data init_data = { };
  41        struct tps6105x_priv *priv;
  42        int ret;
  43
  44        /* This instance is not set for torch mode so bail out */
  45        if (pdata->mode != TPS6105X_MODE_TORCH) {
  46                dev_info(&pdev->dev,
  47                        "chip not in torch mode, exit probe");
  48                return -EINVAL;
  49        }
  50
  51        priv = devm_kzalloc(&pdev->dev, sizeof(*priv), GFP_KERNEL);
  52        if (!priv)
  53                return -ENOMEM;
  54        /* fwnode/devicetree is optional. NULL is allowed for priv->fwnode */
  55        priv->fwnode = device_get_next_child_node(pdev->dev.parent, NULL);
  56        ret = devm_add_action_or_reset(&pdev->dev, tps6105x_handle_put, priv);
  57        if (ret)
  58                return ret;
  59        priv->regmap = tps6105x->regmap;
  60        priv->cdev.brightness_set_blocking = tps6105x_brightness_set;
  61        priv->cdev.max_brightness = 7;
  62        init_data.devicename = "tps6105x";
  63        init_data.default_label = ":torch";
  64        init_data.fwnode = priv->fwnode;
  65
  66        ret = regmap_update_bits(tps6105x->regmap, TPS6105X_REG_0,
  67                                 TPS6105X_REG0_MODE_MASK |
  68                                        TPS6105X_REG0_TORCHC_MASK,
  69                                 TPS6105X_REG0_MODE_TORCH <<
  70                                        TPS6105X_REG0_MODE_SHIFT);
  71        if (ret)
  72                return ret;
  73
  74        return devm_led_classdev_register_ext(&pdev->dev, &priv->cdev,
  75                                              &init_data);
  76}
  77
  78static struct platform_driver led_driver = {
  79        .probe = tps6105x_led_probe,
  80        .driver = {
  81                .name = "tps6105x-leds",
  82        },
  83};
  84
  85module_platform_driver(led_driver);
  86
  87MODULE_DESCRIPTION("TPS6105x LED driver");
  88MODULE_AUTHOR("Sven Van Asbroeck <TheSven73@gmail.com>");
  89MODULE_LICENSE("GPL v2");
  90