sched: Remove double_rq_lock() from __migrate_task()
[linux/fpc-iii.git] / drivers / leds / leds-max8997.c
blobf449a8bdddc7ced48f3408a2dde6b810dde68ce7
1 /*
2 * leds-max8997.c - LED class driver for MAX8997 LEDs.
4 * Copyright (C) 2011 Samsung Electronics
5 * Donggeun Kim <dg77.kim@samsung.com>
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.
13 #include <linux/module.h>
14 #include <linux/err.h>
15 #include <linux/slab.h>
16 #include <linux/workqueue.h>
17 #include <linux/leds.h>
18 #include <linux/mfd/max8997.h>
19 #include <linux/mfd/max8997-private.h>
20 #include <linux/platform_device.h>
22 #define MAX8997_LED_FLASH_SHIFT 3
23 #define MAX8997_LED_FLASH_CUR_MASK 0xf8
24 #define MAX8997_LED_MOVIE_SHIFT 4
25 #define MAX8997_LED_MOVIE_CUR_MASK 0xf0
27 #define MAX8997_LED_FLASH_MAX_BRIGHTNESS 0x1f
28 #define MAX8997_LED_MOVIE_MAX_BRIGHTNESS 0xf
29 #define MAX8997_LED_NONE_MAX_BRIGHTNESS 0
31 #define MAX8997_LED0_FLASH_MASK 0x1
32 #define MAX8997_LED0_FLASH_PIN_MASK 0x5
33 #define MAX8997_LED0_MOVIE_MASK 0x8
34 #define MAX8997_LED0_MOVIE_PIN_MASK 0x28
36 #define MAX8997_LED1_FLASH_MASK 0x2
37 #define MAX8997_LED1_FLASH_PIN_MASK 0x6
38 #define MAX8997_LED1_MOVIE_MASK 0x10
39 #define MAX8997_LED1_MOVIE_PIN_MASK 0x30
41 #define MAX8997_LED_BOOST_ENABLE_MASK (1 << 6)
43 struct max8997_led {
44 struct max8997_dev *iodev;
45 struct led_classdev cdev;
46 bool enabled;
47 int id;
48 enum max8997_led_mode led_mode;
49 struct mutex mutex;
52 static void max8997_led_set_mode(struct max8997_led *led,
53 enum max8997_led_mode mode)
55 int ret;
56 struct i2c_client *client = led->iodev->i2c;
57 u8 mask = 0, val;
59 switch (mode) {
60 case MAX8997_FLASH_MODE:
61 mask = MAX8997_LED1_FLASH_MASK | MAX8997_LED0_FLASH_MASK;
62 val = led->id ?
63 MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK;
64 led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
65 break;
66 case MAX8997_MOVIE_MODE:
67 mask = MAX8997_LED1_MOVIE_MASK | MAX8997_LED0_MOVIE_MASK;
68 val = led->id ?
69 MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK;
70 led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
71 break;
72 case MAX8997_FLASH_PIN_CONTROL_MODE:
73 mask = MAX8997_LED1_FLASH_PIN_MASK |
74 MAX8997_LED0_FLASH_PIN_MASK;
75 val = led->id ?
76 MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK;
77 led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS;
78 break;
79 case MAX8997_MOVIE_PIN_CONTROL_MODE:
80 mask = MAX8997_LED1_MOVIE_PIN_MASK |
81 MAX8997_LED0_MOVIE_PIN_MASK;
82 val = led->id ?
83 MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK;
84 led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS;
85 break;
86 default:
87 led->cdev.max_brightness = MAX8997_LED_NONE_MAX_BRIGHTNESS;
88 break;
91 if (mask) {
92 ret = max8997_update_reg(client, MAX8997_REG_LEN_CNTL, val,
93 mask);
94 if (ret)
95 dev_err(led->iodev->dev,
96 "failed to update register(%d)\n", ret);
99 led->led_mode = mode;
102 static void max8997_led_enable(struct max8997_led *led, bool enable)
104 int ret;
105 struct i2c_client *client = led->iodev->i2c;
106 u8 val = 0, mask = MAX8997_LED_BOOST_ENABLE_MASK;
108 if (led->enabled == enable)
109 return;
111 val = enable ? MAX8997_LED_BOOST_ENABLE_MASK : 0;
113 ret = max8997_update_reg(client, MAX8997_REG_BOOST_CNTL, val, mask);
114 if (ret)
115 dev_err(led->iodev->dev,
116 "failed to update register(%d)\n", ret);
118 led->enabled = enable;
121 static void max8997_led_set_current(struct max8997_led *led,
122 enum led_brightness value)
124 int ret;
125 struct i2c_client *client = led->iodev->i2c;
126 u8 val = 0, mask = 0, reg = 0;
128 switch (led->led_mode) {
129 case MAX8997_FLASH_MODE:
130 case MAX8997_FLASH_PIN_CONTROL_MODE:
131 val = value << MAX8997_LED_FLASH_SHIFT;
132 mask = MAX8997_LED_FLASH_CUR_MASK;
133 reg = led->id ? MAX8997_REG_FLASH2_CUR : MAX8997_REG_FLASH1_CUR;
134 break;
135 case MAX8997_MOVIE_MODE:
136 case MAX8997_MOVIE_PIN_CONTROL_MODE:
137 val = value << MAX8997_LED_MOVIE_SHIFT;
138 mask = MAX8997_LED_MOVIE_CUR_MASK;
139 reg = MAX8997_REG_MOVIE_CUR;
140 break;
141 default:
142 break;
145 if (mask) {
146 ret = max8997_update_reg(client, reg, val, mask);
147 if (ret)
148 dev_err(led->iodev->dev,
149 "failed to update register(%d)\n", ret);
153 static void max8997_led_brightness_set(struct led_classdev *led_cdev,
154 enum led_brightness value)
156 struct max8997_led *led =
157 container_of(led_cdev, struct max8997_led, cdev);
159 if (value) {
160 max8997_led_set_current(led, value);
161 max8997_led_enable(led, true);
162 } else {
163 max8997_led_set_current(led, value);
164 max8997_led_enable(led, false);
168 static ssize_t max8997_led_show_mode(struct device *dev,
169 struct device_attribute *attr, char *buf)
171 struct led_classdev *led_cdev = dev_get_drvdata(dev);
172 struct max8997_led *led =
173 container_of(led_cdev, struct max8997_led, cdev);
174 ssize_t ret = 0;
176 mutex_lock(&led->mutex);
178 switch (led->led_mode) {
179 case MAX8997_FLASH_MODE:
180 ret += sprintf(buf, "FLASH\n");
181 break;
182 case MAX8997_MOVIE_MODE:
183 ret += sprintf(buf, "MOVIE\n");
184 break;
185 case MAX8997_FLASH_PIN_CONTROL_MODE:
186 ret += sprintf(buf, "FLASH_PIN_CONTROL\n");
187 break;
188 case MAX8997_MOVIE_PIN_CONTROL_MODE:
189 ret += sprintf(buf, "MOVIE_PIN_CONTROL\n");
190 break;
191 default:
192 ret += sprintf(buf, "NONE\n");
193 break;
196 mutex_unlock(&led->mutex);
198 return ret;
201 static ssize_t max8997_led_store_mode(struct device *dev,
202 struct device_attribute *attr,
203 const char *buf, size_t size)
205 struct led_classdev *led_cdev = dev_get_drvdata(dev);
206 struct max8997_led *led =
207 container_of(led_cdev, struct max8997_led, cdev);
208 enum max8997_led_mode mode;
210 mutex_lock(&led->mutex);
212 if (!strncmp(buf, "FLASH_PIN_CONTROL", 17))
213 mode = MAX8997_FLASH_PIN_CONTROL_MODE;
214 else if (!strncmp(buf, "MOVIE_PIN_CONTROL", 17))
215 mode = MAX8997_MOVIE_PIN_CONTROL_MODE;
216 else if (!strncmp(buf, "FLASH", 5))
217 mode = MAX8997_FLASH_MODE;
218 else if (!strncmp(buf, "MOVIE", 5))
219 mode = MAX8997_MOVIE_MODE;
220 else
221 mode = MAX8997_NONE;
223 max8997_led_set_mode(led, mode);
225 mutex_unlock(&led->mutex);
227 return size;
230 static DEVICE_ATTR(mode, 0644, max8997_led_show_mode, max8997_led_store_mode);
232 static int max8997_led_probe(struct platform_device *pdev)
234 struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent);
235 struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev);
236 struct max8997_led *led;
237 char name[20];
238 int ret = 0;
240 if (pdata == NULL) {
241 dev_err(&pdev->dev, "no platform data\n");
242 return -ENODEV;
245 led = devm_kzalloc(&pdev->dev, sizeof(*led), GFP_KERNEL);
246 if (led == NULL)
247 return -ENOMEM;
249 led->id = pdev->id;
250 snprintf(name, sizeof(name), "max8997-led%d", pdev->id);
252 led->cdev.name = name;
253 led->cdev.brightness_set = max8997_led_brightness_set;
254 led->cdev.flags |= LED_CORE_SUSPENDRESUME;
255 led->cdev.brightness = 0;
256 led->iodev = iodev;
258 /* initialize mode and brightness according to platform_data */
259 if (pdata->led_pdata) {
260 u8 mode = 0, brightness = 0;
262 mode = pdata->led_pdata->mode[led->id];
263 brightness = pdata->led_pdata->brightness[led->id];
265 max8997_led_set_mode(led, pdata->led_pdata->mode[led->id]);
267 if (brightness > led->cdev.max_brightness)
268 brightness = led->cdev.max_brightness;
269 max8997_led_set_current(led, brightness);
270 led->cdev.brightness = brightness;
271 } else {
272 max8997_led_set_mode(led, MAX8997_NONE);
273 max8997_led_set_current(led, 0);
276 mutex_init(&led->mutex);
278 platform_set_drvdata(pdev, led);
280 ret = led_classdev_register(&pdev->dev, &led->cdev);
281 if (ret < 0)
282 return ret;
284 ret = device_create_file(led->cdev.dev, &dev_attr_mode);
285 if (ret != 0) {
286 dev_err(&pdev->dev,
287 "failed to create file: %d\n", ret);
288 led_classdev_unregister(&led->cdev);
289 return ret;
292 return 0;
295 static int max8997_led_remove(struct platform_device *pdev)
297 struct max8997_led *led = platform_get_drvdata(pdev);
299 device_remove_file(led->cdev.dev, &dev_attr_mode);
300 led_classdev_unregister(&led->cdev);
302 return 0;
305 static struct platform_driver max8997_led_driver = {
306 .driver = {
307 .name = "max8997-led",
308 .owner = THIS_MODULE,
310 .probe = max8997_led_probe,
311 .remove = max8997_led_remove,
314 module_platform_driver(max8997_led_driver);
316 MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>");
317 MODULE_DESCRIPTION("MAX8997 LED driver");
318 MODULE_LICENSE("GPL");
319 MODULE_ALIAS("platform:max8997-led");