1/*
2 * LEDs driver for Dialog Semiconductor DA9030/DA9034
3 *
4 * Copyright (C) 2008 Compulab, Ltd.
5 *	Mike Rapoport <mike@compulab.co.il>
6 *
7 * Copyright (C) 2006-2008 Marvell International Ltd.
8 *	Eric Miao <eric.miao@marvell.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation.
13 */
14
15#include <linux/module.h>
16#include <linux/kernel.h>
17#include <linux/platform_device.h>
18#include <linux/leds.h>
19#include <linux/workqueue.h>
20#include <linux/mfd/da903x.h>
21#include <linux/slab.h>
22
23#define DA9030_LED1_CONTROL	0x20
24#define DA9030_LED2_CONTROL	0x21
25#define DA9030_LED3_CONTROL	0x22
26#define DA9030_LED4_CONTROL	0x23
27#define DA9030_LEDPC_CONTROL	0x24
28#define DA9030_MISC_CONTROL_A	0x26	/* Vibrator Control */
29
30#define DA9034_LED1_CONTROL	0x35
31#define DA9034_LED2_CONTROL	0x36
32#define DA9034_VIBRA		0x40
33
34struct da903x_led {
35	struct led_classdev	cdev;
36	struct work_struct	work;
37	struct device		*master;
38	enum led_brightness	new_brightness;
39	int			id;
40	int			flags;
41};
42
43#define DA9030_LED_OFFSET(id)	((id) - DA9030_ID_LED_1)
44#define DA9034_LED_OFFSET(id)	((id) - DA9034_ID_LED_1)
45
46static void da903x_led_work(struct work_struct *work)
47{
48	struct da903x_led *led = container_of(work, struct da903x_led, work);
49	uint8_t val;
50	int offset;
51
52	switch (led->id) {
53	case DA9030_ID_LED_1:
54	case DA9030_ID_LED_2:
55	case DA9030_ID_LED_3:
56	case DA9030_ID_LED_4:
57	case DA9030_ID_LED_PC:
58		offset = DA9030_LED_OFFSET(led->id);
59		val = led->flags & ~0x87;
60		val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
61		val |= (0x7 - (led->new_brightness >> 5)) & 0x7; /* PWM<2:0> */
62		da903x_write(led->master, DA9030_LED1_CONTROL + offset, val);
63		break;
64	case DA9030_ID_VIBRA:
65		val = led->flags & ~0x80;
66		val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
67		da903x_write(led->master, DA9030_MISC_CONTROL_A, val);
68		break;
69	case DA9034_ID_LED_1:
70	case DA9034_ID_LED_2:
71		offset = DA9034_LED_OFFSET(led->id);
72		val = (led->new_brightness * 0x5f / LED_FULL) & 0x7f;
73		val |= (led->flags & DA9034_LED_RAMP) ? 0x80 : 0;
74		da903x_write(led->master, DA9034_LED1_CONTROL + offset, val);
75		break;
76	case DA9034_ID_VIBRA:
77		val = led->new_brightness & 0xfe;
78		da903x_write(led->master, DA9034_VIBRA, val);
79		break;
80	}
81}
82
83static void da903x_led_set(struct led_classdev *led_cdev,
84			   enum led_brightness value)
85{
86	struct da903x_led *led;
87
88	led = container_of(led_cdev, struct da903x_led, cdev);
89	led->new_brightness = value;
90	schedule_work(&led->work);
91}
92
93static int da903x_led_probe(struct platform_device *pdev)
94{
95	struct led_info *pdata = dev_get_platdata(&pdev->dev);
96	struct da903x_led *led;
97	int id, ret;
98
99	if (pdata == NULL)
100		return 0;
101
102	id = pdev->id;
103
104	if (!((id >= DA9030_ID_LED_1 && id <= DA9030_ID_VIBRA) ||
105	      (id >= DA9034_ID_LED_1 && id <= DA9034_ID_VIBRA))) {
106		dev_err(&pdev->dev, "invalid LED ID (%d) specified\n", id);
107		return -EINVAL;
108	}
109
110	led = devm_kzalloc(&pdev->dev, sizeof(struct da903x_led), GFP_KERNEL);
111	if (!led)
112		return -ENOMEM;
113
114	led->cdev.name = pdata->name;
115	led->cdev.default_trigger = pdata->default_trigger;
116	led->cdev.brightness_set = da903x_led_set;
117	led->cdev.brightness = LED_OFF;
118
119	led->id = id;
120	led->flags = pdata->flags;
121	led->master = pdev->dev.parent;
122	led->new_brightness = LED_OFF;
123
124	INIT_WORK(&led->work, da903x_led_work);
125
126	ret = led_classdev_register(led->master, &led->cdev);
127	if (ret) {
128		dev_err(&pdev->dev, "failed to register LED %d\n", id);
129		return ret;
130	}
131
132	platform_set_drvdata(pdev, led);
133	return 0;
134}
135
136static int da903x_led_remove(struct platform_device *pdev)
137{
138	struct da903x_led *led = platform_get_drvdata(pdev);
139
140	led_classdev_unregister(&led->cdev);
141	return 0;
142}
143
144static struct platform_driver da903x_led_driver = {
145	.driver	= {
146		.name	= "da903x-led",
147	},
148	.probe		= da903x_led_probe,
149	.remove		= da903x_led_remove,
150};
151
152module_platform_driver(da903x_led_driver);
153
154MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034");
155MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
156MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
157MODULE_LICENSE("GPL");
158MODULE_ALIAS("platform:da903x-led");
159