Root/drivers/leds/leds-da903x.c

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

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