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8584cb82 DK |
1 | /* |
2 | * leds-max8997.c - LED class driver for MAX8997 LEDs. | |
3 | * | |
4 | * Copyright (C) 2011 Samsung Electronics | |
5 | * Donggeun Kim <dg77.kim@samsung.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/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> | |
21 | ||
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 | |
26 | ||
27 | #define MAX8997_LED_FLASH_MAX_BRIGHTNESS 0x1f | |
28 | #define MAX8997_LED_MOVIE_MAX_BRIGHTNESS 0xf | |
29 | #define MAX8997_LED_NONE_MAX_BRIGHTNESS 0 | |
30 | ||
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 | |
35 | ||
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 | |
40 | ||
41 | #define MAX8997_LED_BOOST_ENABLE_MASK (1 << 6) | |
42 | ||
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; | |
50 | }; | |
51 | ||
52 | static void max8997_led_clear_mode(struct max8997_led *led, | |
53 | enum max8997_led_mode mode) | |
54 | { | |
55 | struct i2c_client *client = led->iodev->i2c; | |
56 | u8 val = 0, mask = 0; | |
57 | int ret; | |
58 | ||
59 | switch (mode) { | |
60 | case MAX8997_FLASH_MODE: | |
61 | mask = led->id ? | |
62 | MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK; | |
63 | break; | |
64 | case MAX8997_MOVIE_MODE: | |
65 | mask = led->id ? | |
66 | MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK; | |
67 | break; | |
68 | case MAX8997_FLASH_PIN_CONTROL_MODE: | |
69 | mask = led->id ? | |
70 | MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK; | |
71 | break; | |
72 | case MAX8997_MOVIE_PIN_CONTROL_MODE: | |
73 | mask = led->id ? | |
74 | MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK; | |
75 | break; | |
76 | default: | |
77 | break; | |
78 | } | |
79 | ||
80 | if (mask) { | |
81 | ret = max8997_update_reg(client, | |
82 | MAX8997_REG_LEN_CNTL, val, mask); | |
83 | if (ret) | |
84 | dev_err(led->iodev->dev, | |
85 | "failed to update register(%d)\n", ret); | |
86 | } | |
87 | } | |
88 | ||
89 | static void max8997_led_set_mode(struct max8997_led *led, | |
90 | enum max8997_led_mode mode) | |
91 | { | |
92 | int ret; | |
93 | struct i2c_client *client = led->iodev->i2c; | |
94 | u8 mask = 0; | |
95 | ||
96 | /* First, clear the previous mode */ | |
97 | max8997_led_clear_mode(led, led->led_mode); | |
98 | ||
99 | switch (mode) { | |
100 | case MAX8997_FLASH_MODE: | |
101 | mask = led->id ? | |
102 | MAX8997_LED1_FLASH_MASK : MAX8997_LED0_FLASH_MASK; | |
103 | led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS; | |
104 | break; | |
105 | case MAX8997_MOVIE_MODE: | |
106 | mask = led->id ? | |
107 | MAX8997_LED1_MOVIE_MASK : MAX8997_LED0_MOVIE_MASK; | |
108 | led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS; | |
109 | break; | |
110 | case MAX8997_FLASH_PIN_CONTROL_MODE: | |
111 | mask = led->id ? | |
112 | MAX8997_LED1_FLASH_PIN_MASK : MAX8997_LED0_FLASH_PIN_MASK; | |
113 | led->cdev.max_brightness = MAX8997_LED_FLASH_MAX_BRIGHTNESS; | |
114 | break; | |
115 | case MAX8997_MOVIE_PIN_CONTROL_MODE: | |
116 | mask = led->id ? | |
117 | MAX8997_LED1_MOVIE_PIN_MASK : MAX8997_LED0_MOVIE_PIN_MASK; | |
118 | led->cdev.max_brightness = MAX8997_LED_MOVIE_MAX_BRIGHTNESS; | |
119 | break; | |
120 | default: | |
121 | led->cdev.max_brightness = MAX8997_LED_NONE_MAX_BRIGHTNESS; | |
122 | break; | |
123 | } | |
124 | ||
125 | if (mask) { | |
126 | ret = max8997_update_reg(client, | |
127 | MAX8997_REG_LEN_CNTL, mask, mask); | |
128 | if (ret) | |
129 | dev_err(led->iodev->dev, | |
130 | "failed to update register(%d)\n", ret); | |
131 | } | |
132 | ||
133 | led->led_mode = mode; | |
134 | } | |
135 | ||
136 | static void max8997_led_enable(struct max8997_led *led, bool enable) | |
137 | { | |
138 | int ret; | |
139 | struct i2c_client *client = led->iodev->i2c; | |
140 | u8 val = 0, mask = MAX8997_LED_BOOST_ENABLE_MASK; | |
141 | ||
142 | if (led->enabled == enable) | |
143 | return; | |
144 | ||
145 | val = enable ? MAX8997_LED_BOOST_ENABLE_MASK : 0; | |
146 | ||
147 | ret = max8997_update_reg(client, MAX8997_REG_BOOST_CNTL, val, mask); | |
148 | if (ret) | |
149 | dev_err(led->iodev->dev, | |
150 | "failed to update register(%d)\n", ret); | |
151 | ||
152 | led->enabled = enable; | |
153 | } | |
154 | ||
155 | static void max8997_led_set_current(struct max8997_led *led, | |
156 | enum led_brightness value) | |
157 | { | |
158 | int ret; | |
159 | struct i2c_client *client = led->iodev->i2c; | |
160 | u8 val = 0, mask = 0, reg = 0; | |
161 | ||
162 | switch (led->led_mode) { | |
163 | case MAX8997_FLASH_MODE: | |
164 | case MAX8997_FLASH_PIN_CONTROL_MODE: | |
165 | val = value << MAX8997_LED_FLASH_SHIFT; | |
166 | mask = MAX8997_LED_FLASH_CUR_MASK; | |
167 | reg = led->id ? MAX8997_REG_FLASH2_CUR : MAX8997_REG_FLASH1_CUR; | |
168 | break; | |
169 | case MAX8997_MOVIE_MODE: | |
170 | case MAX8997_MOVIE_PIN_CONTROL_MODE: | |
171 | val = value << MAX8997_LED_MOVIE_SHIFT; | |
172 | mask = MAX8997_LED_MOVIE_CUR_MASK; | |
173 | reg = MAX8997_REG_MOVIE_CUR; | |
174 | break; | |
175 | default: | |
176 | break; | |
177 | } | |
178 | ||
179 | if (mask) { | |
180 | ret = max8997_update_reg(client, reg, val, mask); | |
181 | if (ret) | |
182 | dev_err(led->iodev->dev, | |
183 | "failed to update register(%d)\n", ret); | |
184 | } | |
185 | } | |
186 | ||
187 | static void max8997_led_brightness_set(struct led_classdev *led_cdev, | |
188 | enum led_brightness value) | |
189 | { | |
190 | struct max8997_led *led = | |
191 | container_of(led_cdev, struct max8997_led, cdev); | |
192 | ||
193 | if (value) { | |
194 | max8997_led_set_current(led, value); | |
195 | max8997_led_enable(led, true); | |
196 | } else { | |
197 | max8997_led_set_current(led, value); | |
198 | max8997_led_enable(led, false); | |
199 | } | |
200 | } | |
201 | ||
202 | static ssize_t max8997_led_show_mode(struct device *dev, | |
203 | struct device_attribute *attr, char *buf) | |
204 | { | |
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 | ssize_t ret = 0; | |
209 | ||
210 | mutex_lock(&led->mutex); | |
211 | ||
212 | switch (led->led_mode) { | |
213 | case MAX8997_FLASH_MODE: | |
214 | ret += sprintf(buf, "FLASH\n"); | |
215 | break; | |
216 | case MAX8997_MOVIE_MODE: | |
217 | ret += sprintf(buf, "MOVIE\n"); | |
218 | break; | |
219 | case MAX8997_FLASH_PIN_CONTROL_MODE: | |
220 | ret += sprintf(buf, "FLASH_PIN_CONTROL\n"); | |
221 | break; | |
222 | case MAX8997_MOVIE_PIN_CONTROL_MODE: | |
223 | ret += sprintf(buf, "MOVIE_PIN_CONTROL\n"); | |
224 | break; | |
225 | default: | |
226 | ret += sprintf(buf, "NONE\n"); | |
227 | break; | |
228 | } | |
229 | ||
230 | mutex_unlock(&led->mutex); | |
231 | ||
232 | return ret; | |
233 | } | |
234 | ||
235 | static ssize_t max8997_led_store_mode(struct device *dev, | |
236 | struct device_attribute *attr, | |
237 | const char *buf, size_t size) | |
238 | { | |
239 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
240 | struct max8997_led *led = | |
241 | container_of(led_cdev, struct max8997_led, cdev); | |
242 | enum max8997_led_mode mode; | |
243 | ||
244 | mutex_lock(&led->mutex); | |
245 | ||
246 | if (!strncmp(buf, "FLASH_PIN_CONTROL", 17)) | |
247 | mode = MAX8997_FLASH_PIN_CONTROL_MODE; | |
248 | else if (!strncmp(buf, "MOVIE_PIN_CONTROL", 17)) | |
249 | mode = MAX8997_MOVIE_PIN_CONTROL_MODE; | |
250 | else if (!strncmp(buf, "FLASH", 5)) | |
251 | mode = MAX8997_FLASH_MODE; | |
252 | else if (!strncmp(buf, "MOVIE", 5)) | |
253 | mode = MAX8997_MOVIE_MODE; | |
254 | else | |
255 | mode = MAX8997_NONE; | |
256 | ||
257 | max8997_led_set_mode(led, mode); | |
258 | ||
259 | mutex_unlock(&led->mutex); | |
260 | ||
261 | return size; | |
262 | } | |
263 | ||
264 | static DEVICE_ATTR(mode, 0644, max8997_led_show_mode, max8997_led_store_mode); | |
265 | ||
266 | static int __devinit max8997_led_probe(struct platform_device *pdev) | |
267 | { | |
268 | struct max8997_dev *iodev = dev_get_drvdata(pdev->dev.parent); | |
269 | struct max8997_platform_data *pdata = dev_get_platdata(iodev->dev); | |
270 | struct max8997_led *led; | |
271 | char name[20]; | |
272 | int ret = 0; | |
273 | ||
274 | if (pdata == NULL) { | |
275 | dev_err(&pdev->dev, "no platform data\n"); | |
276 | return -ENODEV; | |
277 | } | |
278 | ||
279 | led = kzalloc(sizeof(*led), GFP_KERNEL); | |
280 | if (led == NULL) { | |
281 | ret = -ENOMEM; | |
282 | goto err_mem; | |
283 | } | |
284 | ||
285 | led->id = pdev->id; | |
286 | snprintf(name, sizeof(name), "max8997-led%d", pdev->id); | |
287 | ||
288 | led->cdev.name = name; | |
289 | led->cdev.brightness_set = max8997_led_brightness_set; | |
290 | led->cdev.flags |= LED_CORE_SUSPENDRESUME; | |
291 | led->cdev.brightness = 0; | |
292 | led->iodev = iodev; | |
293 | ||
294 | /* initialize mode and brightness according to platform_data */ | |
295 | if (pdata->led_pdata) { | |
296 | u8 mode = 0, brightness = 0; | |
297 | ||
298 | mode = pdata->led_pdata->mode[led->id]; | |
299 | brightness = pdata->led_pdata->brightness[led->id]; | |
300 | ||
301 | max8997_led_set_mode(led, pdata->led_pdata->mode[led->id]); | |
302 | ||
303 | if (brightness > led->cdev.max_brightness) | |
304 | brightness = led->cdev.max_brightness; | |
305 | max8997_led_set_current(led, brightness); | |
306 | led->cdev.brightness = brightness; | |
307 | } else { | |
308 | max8997_led_set_mode(led, MAX8997_NONE); | |
309 | max8997_led_set_current(led, 0); | |
310 | } | |
311 | ||
312 | mutex_init(&led->mutex); | |
313 | ||
314 | platform_set_drvdata(pdev, led); | |
315 | ||
316 | ret = led_classdev_register(&pdev->dev, &led->cdev); | |
317 | if (ret < 0) | |
318 | goto err_led; | |
319 | ||
320 | ret = device_create_file(led->cdev.dev, &dev_attr_mode); | |
321 | if (ret != 0) { | |
322 | dev_err(&pdev->dev, | |
323 | "failed to create file: %d\n", ret); | |
324 | goto err_file; | |
325 | } | |
326 | ||
327 | return 0; | |
328 | ||
329 | err_file: | |
330 | led_classdev_unregister(&led->cdev); | |
331 | err_led: | |
332 | kfree(led); | |
333 | err_mem: | |
334 | return ret; | |
335 | } | |
336 | ||
337 | static int __devexit max8997_led_remove(struct platform_device *pdev) | |
338 | { | |
339 | struct max8997_led *led = platform_get_drvdata(pdev); | |
340 | ||
341 | device_remove_file(led->cdev.dev, &dev_attr_mode); | |
342 | led_classdev_unregister(&led->cdev); | |
343 | kfree(led); | |
344 | ||
345 | return 0; | |
346 | } | |
347 | ||
348 | static struct platform_driver max8997_led_driver = { | |
349 | .driver = { | |
350 | .name = "max8997-led", | |
351 | .owner = THIS_MODULE, | |
352 | }, | |
353 | .probe = max8997_led_probe, | |
354 | .remove = __devexit_p(max8997_led_remove), | |
355 | }; | |
356 | ||
7fafefb8 | 357 | module_platform_driver(max8997_led_driver); |
8584cb82 DK |
358 | |
359 | MODULE_AUTHOR("Donggeun Kim <dg77.kim@samsung.com>"); | |
360 | MODULE_DESCRIPTION("MAX8997 LED driver"); | |
361 | MODULE_LICENSE("GPL"); | |
362 | MODULE_ALIAS("platform:max8997-led"); |