blob: 0d4c16678ace37a2030f68d141bdf19cfc50d3b3 [file] [log] [blame]
Haojian Zhuang0a2f9152010-01-06 17:10:09 -05001/*
2 * LED driver for Marvell 88PM860x
3 *
4 * Copyright (C) 2009 Marvell International Ltd.
5 * Haojian Zhuang <haojian.zhuang@marvell.com>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
10 *
11 */
12
13#include <linux/kernel.h>
14#include <linux/init.h>
15#include <linux/platform_device.h>
16#include <linux/i2c.h>
17#include <linux/leds.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090018#include <linux/slab.h>
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050019#include <linux/workqueue.h>
20#include <linux/mfd/88pm860x.h>
21
22#define LED_PWM_SHIFT (3)
23#define LED_PWM_MASK (0x1F)
24#define LED_CURRENT_MASK (0x07 << 5)
25
26#define LED_BLINK_ON_MASK (0x07)
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050027#define LED_BLINK_MASK (0x7F)
28
29#define LED_BLINK_ON(x) ((x & 0x7) * 66 + 66)
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050030#define LED_BLINK_ON_MIN LED_BLINK_ON(0)
31#define LED_BLINK_ON_MAX LED_BLINK_ON(0x7)
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -040032#define LED_ON_CONTINUOUS (0x0F << 3)
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050033#define LED_TO_ON(x) ((x - 66) / 66)
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050034
35#define LED1_BLINK_EN (1 << 1)
36#define LED2_BLINK_EN (1 << 2)
37
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050038struct pm860x_led {
39 struct led_classdev cdev;
40 struct i2c_client *i2c;
41 struct work_struct work;
42 struct pm860x_chip *chip;
43 struct mutex lock;
44 char name[MFD_NAME_SIZE];
45
46 int port;
47 int iset;
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050048 unsigned char brightness;
49 unsigned char current_brightness;
50
51 int blink_data;
52 int blink_time;
53 int blink_on;
54 int blink_off;
55};
56
57/* return offset of color register */
58static inline int __led_off(int port)
59{
60 int ret = -EINVAL;
61
62 switch (port) {
63 case PM8606_LED1_RED:
64 case PM8606_LED1_GREEN:
65 case PM8606_LED1_BLUE:
66 ret = port - PM8606_LED1_RED + PM8606_RGB1B;
67 break;
68 case PM8606_LED2_RED:
69 case PM8606_LED2_GREEN:
70 case PM8606_LED2_BLUE:
71 ret = port - PM8606_LED2_RED + PM8606_RGB2B;
72 break;
73 }
74 return ret;
75}
76
77/* return offset of blink register */
78static inline int __blink_off(int port)
79{
80 int ret = -EINVAL;
81
82 switch (port) {
83 case PM8606_LED1_RED:
84 case PM8606_LED1_GREEN:
85 case PM8606_LED1_BLUE:
86 ret = PM8606_RGB1A;
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -040087 break;
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050088 case PM8606_LED2_RED:
89 case PM8606_LED2_GREEN:
90 case PM8606_LED2_BLUE:
91 ret = PM8606_RGB2A;
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -040092 break;
Haojian Zhuang0a2f9152010-01-06 17:10:09 -050093 }
94 return ret;
95}
96
97static inline int __blink_ctl_mask(int port)
98{
99 int ret = -EINVAL;
100
101 switch (port) {
102 case PM8606_LED1_RED:
103 case PM8606_LED1_GREEN:
104 case PM8606_LED1_BLUE:
105 ret = LED1_BLINK_EN;
106 break;
107 case PM8606_LED2_RED:
108 case PM8606_LED2_GREEN:
109 case PM8606_LED2_BLUE:
110 ret = LED2_BLINK_EN;
111 break;
112 }
113 return ret;
114}
115
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500116static void pm860x_led_work(struct work_struct *work)
117{
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -0400118
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500119 struct pm860x_led *led;
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -0400120 struct pm860x_chip *chip;
Haojian Zhuang3154c342011-03-07 23:43:10 +0800121 unsigned char buf[3];
122 int mask, ret;
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500123
124 led = container_of(work, struct pm860x_led, work);
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -0400125 chip = led->chip;
126 mutex_lock(&led->lock);
127 if ((led->current_brightness == 0) && led->brightness) {
128 if (led->iset) {
129 pm860x_set_bits(led->i2c, __led_off(led->port),
130 LED_CURRENT_MASK, led->iset);
131 }
Haojian Zhuang3154c342011-03-07 23:43:10 +0800132 pm860x_set_bits(led->i2c, __blink_off(led->port),
133 LED_BLINK_MASK, LED_ON_CONTINUOUS);
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -0400134 mask = __blink_ctl_mask(led->port);
135 pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, mask);
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -0400136 }
137 pm860x_set_bits(led->i2c, __led_off(led->port), LED_PWM_MASK,
138 led->brightness);
Haojian Zhuang3154c342011-03-07 23:43:10 +0800139
140 if (led->brightness == 0) {
141 pm860x_bulk_read(led->i2c, __led_off(led->port), 3, buf);
142 ret = buf[0] & LED_PWM_MASK;
143 ret |= buf[1] & LED_PWM_MASK;
144 ret |= buf[2] & LED_PWM_MASK;
145 if (ret == 0) {
146 /* unset current since no led is lighting */
147 pm860x_set_bits(led->i2c, __led_off(led->port),
148 LED_CURRENT_MASK, 0);
149 mask = __blink_ctl_mask(led->port);
150 pm860x_set_bits(led->i2c, PM8606_WLED3B, mask, 0);
151 }
152 }
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -0400153 led->current_brightness = led->brightness;
154 dev_dbg(chip->dev, "Update LED. (reg:%d, brightness:%d)\n",
155 __led_off(led->port), led->brightness);
156 mutex_unlock(&led->lock);
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500157}
158
159static void pm860x_led_set(struct led_classdev *cdev,
160 enum led_brightness value)
161{
162 struct pm860x_led *data = container_of(cdev, struct pm860x_led, cdev);
163
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500164 data->brightness = value >> 3;
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500165 schedule_work(&data->work);
166}
167
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500168static int pm860x_led_probe(struct platform_device *pdev)
169{
170 struct pm860x_chip *chip = dev_get_drvdata(pdev->dev.parent);
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500171 struct pm860x_led_pdata *pdata;
172 struct pm860x_led *data;
173 struct resource *res;
174 int ret;
175
176 res = platform_get_resource(pdev, IORESOURCE_IO, 0);
177 if (res == NULL) {
178 dev_err(&pdev->dev, "No I/O resource!\n");
179 return -EINVAL;
180 }
181
Samuel Ortiz07259a72011-04-06 16:26:56 +0200182 pdata = pdev->dev.platform_data;
Haojian Zhuang3154c342011-03-07 23:43:10 +0800183 if (pdata == NULL) {
Haojian Zhuangf5d59fc2010-09-08 09:44:33 -0400184 dev_err(&pdev->dev, "No platform data!\n");
Christoph Fritz98652ef2010-04-17 13:57:17 +0200185 return -EINVAL;
186 }
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500187
188 data = kzalloc(sizeof(struct pm860x_led), GFP_KERNEL);
189 if (data == NULL)
190 return -ENOMEM;
Haojian Zhuang3154c342011-03-07 23:43:10 +0800191 strncpy(data->name, res->name, MFD_NAME_SIZE - 1);
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500192 dev_set_drvdata(&pdev->dev, data);
193 data->chip = chip;
194 data->i2c = (chip->id == CHIP_PM8606) ? chip->client : chip->companion;
195 data->iset = pdata->iset;
Haojian Zhuang3154c342011-03-07 23:43:10 +0800196 data->port = pdata->flags;
Christoph Fritz98652ef2010-04-17 13:57:17 +0200197 if (data->port < 0) {
198 dev_err(&pdev->dev, "check device failed\n");
199 kfree(data);
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500200 return -EINVAL;
Christoph Fritz98652ef2010-04-17 13:57:17 +0200201 }
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500202
203 data->current_brightness = 0;
204 data->cdev.name = data->name;
205 data->cdev.brightness_set = pm860x_led_set;
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500206 mutex_init(&data->lock);
207 INIT_WORK(&data->work, pm860x_led_work);
208
209 ret = led_classdev_register(chip->dev, &data->cdev);
210 if (ret < 0) {
211 dev_err(&pdev->dev, "Failed to register LED: %d\n", ret);
212 goto out;
213 }
Haojian Zhuang3154c342011-03-07 23:43:10 +0800214 pm860x_led_set(&data->cdev, 0);
Haojian Zhuang0a2f9152010-01-06 17:10:09 -0500215 return 0;
216out:
217 kfree(data);
218 return ret;
219}
220
221static int pm860x_led_remove(struct platform_device *pdev)
222{
223 struct pm860x_led *data = platform_get_drvdata(pdev);
224
225 led_classdev_unregister(&data->cdev);
226 kfree(data);
227
228 return 0;
229}
230
231static struct platform_driver pm860x_led_driver = {
232 .driver = {
233 .name = "88pm860x-led",
234 .owner = THIS_MODULE,
235 },
236 .probe = pm860x_led_probe,
237 .remove = pm860x_led_remove,
238};
239
240static int __devinit pm860x_led_init(void)
241{
242 return platform_driver_register(&pm860x_led_driver);
243}
244module_init(pm860x_led_init);
245
246static void __devexit pm860x_led_exit(void)
247{
248 platform_driver_unregister(&pm860x_led_driver);
249}
250module_exit(pm860x_led_exit);
251
252MODULE_DESCRIPTION("LED driver for Marvell PM860x");
253MODULE_AUTHOR("Haojian Zhuang <haojian.zhuang@marvell.com>");
254MODULE_LICENSE("GPL");
255MODULE_ALIAS("platform:88pm860x-led");