1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * LEDs driver for Dialog Semiconductor DA9030/DA9034
4 *
5 * Copyright (C) 2008 Compulab, Ltd.
6 *	Mike Rapoport <mike@compulab.co.il>
7 *
8 * Copyright (C) 2006-2008 Marvell International Ltd.
9 *	Eric Miao <eric.miao@marvell.com>
10 */
11
12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/platform_device.h>
15#include <linux/leds.h>
16#include <linux/mfd/da903x.h>
17#include <linux/slab.h>
18
19#define DA9030_LED1_CONTROL	0x20
20#define DA9030_LED2_CONTROL	0x21
21#define DA9030_LED3_CONTROL	0x22
22#define DA9030_LED4_CONTROL	0x23
23#define DA9030_LEDPC_CONTROL	0x24
24#define DA9030_MISC_CONTROL_A	0x26	/* Vibrator Control */
25
26#define DA9034_LED1_CONTROL	0x35
27#define DA9034_LED2_CONTROL	0x36
28#define DA9034_VIBRA		0x40
29
30struct da903x_led {
31	struct led_classdev	cdev;
32	struct device		*master;
33	int			id;
34	int			flags;
35};
36
37#define DA9030_LED_OFFSET(id)	((id) - DA9030_ID_LED_1)
38#define DA9034_LED_OFFSET(id)	((id) - DA9034_ID_LED_1)
39
40static int da903x_led_set(struct led_classdev *led_cdev,
41			   enum led_brightness value)
42{
43	struct da903x_led *led =
44			container_of(led_cdev, struct da903x_led, cdev);
45	uint8_t val;
46	int offset, ret = -EINVAL;
47
48	switch (led->id) {
49	case DA9030_ID_LED_1:
50	case DA9030_ID_LED_2:
51	case DA9030_ID_LED_3:
52	case DA9030_ID_LED_4:
53	case DA9030_ID_LED_PC:
54		offset = DA9030_LED_OFFSET(led->id);
55		val = led->flags & ~0x87;
56		val |= value ? 0x80 : 0; /* EN bit */
57		val |= (0x7 - (value >> 5)) & 0x7; /* PWM<2:0> */
58		ret = da903x_write(led->master, DA9030_LED1_CONTROL + offset,
59				   val);
60		break;
61	case DA9030_ID_VIBRA:
62		val = led->flags & ~0x80;
63		val |= value ? 0x80 : 0; /* EN bit */
64		ret = da903x_write(led->master, DA9030_MISC_CONTROL_A, val);
65		break;
66	case DA9034_ID_LED_1:
67	case DA9034_ID_LED_2:
68		offset = DA9034_LED_OFFSET(led->id);
69		val = (value * 0x5f / LED_FULL) & 0x7f;
70		val |= (led->flags & DA9034_LED_RAMP) ? 0x80 : 0;
71		ret = da903x_write(led->master, DA9034_LED1_CONTROL + offset,
72				   val);
73		break;
74	case DA9034_ID_VIBRA:
75		val = value & 0xfe;
76		ret = da903x_write(led->master, DA9034_VIBRA, val);
77		break;
78	}
79
80	return ret;
81}
82
83static int da903x_led_probe(struct platform_device *pdev)
84{
85	struct led_info *pdata = dev_get_platdata(&pdev->dev);
86	struct da903x_led *led;
87	int id, ret;
88
89	if (pdata == NULL)
90		return 0;
91
92	id = pdev->id;
93
94	if (!((id >= DA9030_ID_LED_1 && id <= DA9030_ID_VIBRA) ||
95	      (id >= DA9034_ID_LED_1 && id <= DA9034_ID_VIBRA))) {
96		dev_err(&pdev->dev, "invalid LED ID (%d) specified\n", id);
97		return -EINVAL;
98	}
99
100	led = devm_kzalloc(&pdev->dev, sizeof(struct da903x_led), GFP_KERNEL);
101	if (!led)
102		return -ENOMEM;
103
104	led->cdev.name = pdata->name;
105	led->cdev.default_trigger = pdata->default_trigger;
106	led->cdev.brightness_set_blocking = da903x_led_set;
107	led->cdev.brightness = LED_OFF;
108
109	led->id = id;
110	led->flags = pdata->flags;
111	led->master = pdev->dev.parent;
112
113	ret = led_classdev_register(led->master, &led->cdev);
114	if (ret) {
115		dev_err(&pdev->dev, "failed to register LED %d\n", id);
116		return ret;
117	}
118
119	platform_set_drvdata(pdev, led);
120
121	return 0;
122}
123
124static void da903x_led_remove(struct platform_device *pdev)
125{
126	struct da903x_led *led = platform_get_drvdata(pdev);
127
128	led_classdev_unregister(&led->cdev);
129}
130
131static struct platform_driver da903x_led_driver = {
132	.driver	= {
133		.name	= "da903x-led",
134	},
135	.probe		= da903x_led_probe,
136	.remove_new	= da903x_led_remove,
137};
138
139module_platform_driver(da903x_led_driver);
140
141MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034");
142MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
143MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
144MODULE_LICENSE("GPL");
145MODULE_ALIAS("platform:da903x-led");
146