tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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/init.h>
18#include <linux/platform_device.h>
19#include <linux/leds.h>
20#include <linux/mfd/da903x.h>
21
22#define DA9030_LED1_CONTROL 0x20
23#define DA9030_LED2_CONTROL 0x21
24#define DA9030_LED3_CONTROL 0x22
25#define DA9030_LED4_CONTROL 0x23
26#define DA9030_LEDPC_CONTROL 0x24
27#define DA9030_MISC_CONTROL_A 0x26 /* Vibrator Control */
28
29#define DA9034_LED1_CONTROL 0x35
30#define DA9034_LED2_CONTROL 0x36
31#define DA9034_VIBRA 0x40
32
33struct da903x_led {
34 struct led_classdev cdev;
35 struct work_struct work;
36 struct device *master;
37 enum led_brightness new_brightness;
38 int id;
39 int flags;
40};
41
42#define DA9030_LED_OFFSET(id) ((id) - DA9030_ID_LED_1)
43#define DA9034_LED_OFFSET(id) ((id) - DA9034_ID_LED_1)
44
45static void da903x_led_work(struct work_struct *work)
46{
47 struct da903x_led *led = container_of(work, struct da903x_led, work);
48 uint8_t val;
49 int offset;
50
51 switch (led->id) {
52 case DA9030_ID_LED_1:
53 case DA9030_ID_LED_2:
54 case DA9030_ID_LED_3:
55 case DA9030_ID_LED_4:
56 case DA9030_ID_LED_PC:
57 offset = DA9030_LED_OFFSET(led->id);
58 val = led->flags & ~0x87;
59 val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
60 val |= (led->new_brightness >> 5) & 0x7; /* PWM<2:0> */
61 da903x_write(led->master, DA9030_LED1_CONTROL + offset, val);
62 break;
63 case DA9030_ID_VIBRA:
64 val = led->flags & ~0x80;
65 val |= (led->new_brightness) ? 0x80 : 0; /* EN bit */
66 da903x_write(led->master, DA9030_MISC_CONTROL_A, val);
67 break;
68 case DA9034_ID_LED_1:
69 case DA9034_ID_LED_2:
70 offset = DA9034_LED_OFFSET(led->id);
71 val = (led->new_brightness * 0x5f / LED_FULL) & 0x7f;
72 val |= (led->flags & DA9034_LED_RAMP) ? 0x80 : 0;
73 da903x_write(led->master, DA9034_LED1_CONTROL + offset, val);
74 break;
75 case DA9034_ID_VIBRA:
76 val = led->new_brightness & 0xfe;
77 da903x_write(led->master, DA9034_VIBRA, val);
78 break;
79 }
80}
81
82static void da903x_led_set(struct led_classdev *led_cdev,
83 enum led_brightness value)
84{
85 struct da903x_led *led;
86
87 led = container_of(led_cdev, struct da903x_led, cdev);
88 led->new_brightness = value;
89 schedule_work(&led->work);
90}
91
92static int __devinit da903x_led_probe(struct platform_device *pdev)
93{
94 struct led_info *pdata = pdev->dev.platform_data;
95 struct da903x_led *led;
96 int id, ret;
97
98 if (pdata == NULL)
99 return 0;
100
101 id = pdev->id;
102
103 if (!((id >= DA9030_ID_LED_1 && id <= DA9030_ID_VIBRA) ||
104 (id >= DA9034_ID_LED_1 && id <= DA9034_ID_VIBRA))) {
105 dev_err(&pdev->dev, "invalid LED ID (%d) specified\n", id);
106 return -EINVAL;
107 }
108
109 led = kzalloc(sizeof(struct da903x_led), GFP_KERNEL);
110 if (led == NULL) {
111 dev_err(&pdev->dev, "failed to alloc memory for LED%d\n", id);
112 return -ENOMEM;
113 }
114
115 led->cdev.name = pdata->name;
116 led->cdev.default_trigger = pdata->default_trigger;
117 led->cdev.brightness_set = da903x_led_set;
118 led->cdev.brightness = LED_OFF;
119
120 led->id = id;
121 led->flags = pdata->flags;
122 led->master = pdev->dev.parent;
123 led->new_brightness = LED_OFF;
124
125 INIT_WORK(&led->work, da903x_led_work);
126
127 ret = led_classdev_register(led->master, &led->cdev);
128 if (ret) {
129 dev_err(&pdev->dev, "failed to register LED %d\n", id);
130 goto err;
131 }
132
133 platform_set_drvdata(pdev, led);
134 return 0;
135
136err:
137 kfree(led);
138 return ret;
139}
140
141static int __devexit da903x_led_remove(struct platform_device *pdev)
142{
143 struct da903x_led *led = platform_get_drvdata(pdev);
144
145 led_classdev_unregister(&led->cdev);
146 kfree(led);
147 return 0;
148}
149
150static struct platform_driver da903x_led_driver = {
151 .driver = {
152 .name = "da903x-led",
153 .owner = THIS_MODULE,
154 },
155 .probe = da903x_led_probe,
156 .remove = __devexit_p(da903x_led_remove),
157};
158
159static int __init da903x_led_init(void)
160{
161 return platform_driver_register(&da903x_led_driver);
162}
163module_init(da903x_led_init);
164
165static void __exit da903x_led_exit(void)
166{
167 platform_driver_unregister(&da903x_led_driver);
168}
169module_exit(da903x_led_exit);
170
171MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034");
172MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>"
173 "Mike Rapoport <mike@compulab.co.il>");
174MODULE_LICENSE("GPL");
175MODULE_ALIAS("platform:da903x-led");