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