1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * LED Driver for Dialog DA9052 PMICs.
4 *
5 * Copyright(c) 2012 Dialog Semiconductor Ltd.
6 *
7 * Author: David Dajun Chen <dchen@diasemi.com>
8 */
9
10#include <linux/module.h>
11#include <linux/kernel.h>
12#include <linux/platform_device.h>
13#include <linux/leds.h>
14#include <linux/slab.h>
15
16#include <linux/mfd/da9052/reg.h>
17#include <linux/mfd/da9052/da9052.h>
18#include <linux/mfd/da9052/pdata.h>
19
20#define DA9052_OPENDRAIN_OUTPUT	2
21#define DA9052_SET_HIGH_LVL_OUTPUT	(1 << 3)
22#define DA9052_MASK_UPPER_NIBBLE	0xF0
23#define DA9052_MASK_LOWER_NIBBLE	0x0F
24#define DA9052_NIBBLE_SHIFT		4
25#define DA9052_MAX_BRIGHTNESS		0x5f
26
27struct da9052_led {
28	struct led_classdev cdev;
29	struct da9052 *da9052;
30	unsigned char led_index;
31	unsigned char id;
32};
33
34static unsigned char led_reg[] = {
35	DA9052_LED_CONT_4_REG,
36	DA9052_LED_CONT_5_REG,
37};
38
39static int da9052_set_led_brightness(struct da9052_led *led,
40				     enum led_brightness brightness)
41{
42	u8 val;
43	int error;
44
45	val = (brightness & 0x7f) | DA9052_LED_CONT_DIM;
46
47	error = da9052_reg_write(led->da9052, led_reg[led->led_index], val);
48	if (error < 0)
49		dev_err(led->da9052->dev, "Failed to set led brightness, %d\n",
50			error);
51	return error;
52}
53
54static int da9052_led_set(struct led_classdev *led_cdev,
55			   enum led_brightness value)
56{
57	struct da9052_led *led =
58			container_of(led_cdev, struct da9052_led, cdev);
59
60	return da9052_set_led_brightness(led, value);
61}
62
63static int da9052_configure_leds(struct da9052 *da9052)
64{
65	int error;
66	unsigned char register_value = DA9052_OPENDRAIN_OUTPUT
67				       | DA9052_SET_HIGH_LVL_OUTPUT;
68
69	error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
70				  DA9052_MASK_LOWER_NIBBLE,
71				  register_value);
72
73	if (error < 0) {
74		dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
75			error);
76		return error;
77	}
78
79	error = da9052_reg_update(da9052, DA9052_GPIO_14_15_REG,
80				  DA9052_MASK_UPPER_NIBBLE,
81				  register_value << DA9052_NIBBLE_SHIFT);
82	if (error < 0)
83		dev_err(da9052->dev, "Failed to write GPIO 14-15 reg, %d\n",
84			error);
85
86	return error;
87}
88
89static int da9052_led_probe(struct platform_device *pdev)
90{
91	struct da9052_pdata *pdata;
92	struct da9052 *da9052;
93	struct led_platform_data *pled;
94	struct da9052_led *led = NULL;
95	int error = -ENODEV;
96	int i;
97
98	da9052 = dev_get_drvdata(pdev->dev.parent);
99	pdata = dev_get_platdata(da9052->dev);
100	if (pdata == NULL) {
101		dev_err(&pdev->dev, "No platform data\n");
102		goto err;
103	}
104
105	pled = pdata->pled;
106	if (pled == NULL) {
107		dev_err(&pdev->dev, "No platform data for LED\n");
108		goto err;
109	}
110
111	led = devm_kcalloc(&pdev->dev,
112			   pled->num_leds, sizeof(struct da9052_led),
113			   GFP_KERNEL);
114	if (!led) {
115		error = -ENOMEM;
116		goto err;
117	}
118
119	for (i = 0; i < pled->num_leds; i++) {
120		led[i].cdev.name = pled->leds[i].name;
121		led[i].cdev.brightness_set_blocking = da9052_led_set;
122		led[i].cdev.brightness = LED_OFF;
123		led[i].cdev.max_brightness = DA9052_MAX_BRIGHTNESS;
124		led[i].led_index = pled->leds[i].flags;
125		led[i].da9052 = dev_get_drvdata(pdev->dev.parent);
126
127		error = led_classdev_register(pdev->dev.parent, &led[i].cdev);
128		if (error) {
129			dev_err(&pdev->dev, "Failed to register led %d\n",
130				led[i].led_index);
131			goto err_register;
132		}
133
134		error = da9052_set_led_brightness(&led[i],
135						  led[i].cdev.brightness);
136		if (error) {
137			dev_err(&pdev->dev, "Unable to init led %d\n",
138				led[i].led_index);
139			continue;
140		}
141	}
142	error = da9052_configure_leds(led->da9052);
143	if (error) {
144		dev_err(&pdev->dev, "Failed to configure GPIO LED%d\n", error);
145		goto err_register;
146	}
147
148	platform_set_drvdata(pdev, led);
149
150	return 0;
151
152err_register:
153	for (i = i - 1; i >= 0; i--)
154		led_classdev_unregister(&led[i].cdev);
155err:
156	return error;
157}
158
159static void da9052_led_remove(struct platform_device *pdev)
160{
161	struct da9052_led *led = platform_get_drvdata(pdev);
162	struct da9052_pdata *pdata;
163	struct da9052 *da9052;
164	struct led_platform_data *pled;
165	int i;
166
167	da9052 = dev_get_drvdata(pdev->dev.parent);
168	pdata = dev_get_platdata(da9052->dev);
169	pled = pdata->pled;
170
171	for (i = 0; i < pled->num_leds; i++) {
172		da9052_set_led_brightness(&led[i], LED_OFF);
173		led_classdev_unregister(&led[i].cdev);
174	}
175}
176
177static struct platform_driver da9052_led_driver = {
178	.driver		= {
179		.name	= "da9052-leds",
180	},
181	.probe		= da9052_led_probe,
182	.remove_new	= da9052_led_remove,
183};
184
185module_platform_driver(da9052_led_driver);
186
187MODULE_AUTHOR("Dialog Semiconductor Ltd <dchen@diasemi.com>");
188MODULE_DESCRIPTION("LED driver for Dialog DA9052 PMIC");
189MODULE_LICENSE("GPL");
190