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
34 struct 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
da903x_led_work(struct work_struct * work)46 static 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
da903x_led_set(struct led_classdev * led_cdev,enum led_brightness value)83 static 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
da903x_led_probe(struct platform_device * pdev)93 static 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
da903x_led_remove(struct platform_device * pdev)136 static 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
144 static 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
152 module_platform_driver(da903x_led_driver);
153
154 MODULE_DESCRIPTION("LEDs driver for Dialog Semiconductor DA9030/DA9034");
155 MODULE_AUTHOR("Eric Miao <eric.miao@marvell.com>");
156 MODULE_AUTHOR("Mike Rapoport <mike@compulab.co.il>");
157 MODULE_LICENSE("GPL");
158 MODULE_ALIAS("platform:da903x-led");
159