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
  12 struct tps6105x_priv {
  13         struct regmap *regmap;
  14         struct led_classdev cdev;
  15         struct fwnode_handle *fwnode;
  16 };
  17
  18 static void tps6105x_handle_put(void *data)
  19 {
  20         struct tps6105x_priv *priv = data;
  21
  22         fwnode_handle_put(priv->fwnode);
  23 }
  24
  25 static 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
  36 static 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
  78 static struct platform_driver led_driver = {
  79         .probe = tps6105x_led_probe,
  80         .driver = {
  81                 .name = "tps6105x-leds",
  82         },
  83 };
  84
  85 module_platform_driver(led_driver);
  86
  87 MODULE_DESCRIPTION("TPS6105x LED driver");
  88 MODULE_AUTHOR("Sven Van Asbroeck <TheSven73@gmail.com>");
  89 MODULE_LICENSE("GPL v2");