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0f59858d SJ |
1 | /* |
2 | * Simple driver for Texas Instruments LM3639 Backlight + Flash LED driver chip | |
3 | * Copyright (C) 2012 Texas Instruments | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License version 2 as | |
7 | * published by the Free Software Foundation. | |
8 | * | |
9 | */ | |
10 | #include <linux/module.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/i2c.h> | |
13 | #include <linux/leds.h> | |
14 | #include <linux/backlight.h> | |
15 | #include <linux/err.h> | |
16 | #include <linux/delay.h> | |
17 | #include <linux/uaccess.h> | |
18 | #include <linux/interrupt.h> | |
19 | #include <linux/regmap.h> | |
20 | #include <linux/platform_data/lm3639_bl.h> | |
21 | ||
22 | #define REG_DEV_ID 0x00 | |
23 | #define REG_CHECKSUM 0x01 | |
24 | #define REG_BL_CONF_1 0x02 | |
25 | #define REG_BL_CONF_2 0x03 | |
26 | #define REG_BL_CONF_3 0x04 | |
27 | #define REG_BL_CONF_4 0x05 | |
28 | #define REG_FL_CONF_1 0x06 | |
29 | #define REG_FL_CONF_2 0x07 | |
30 | #define REG_FL_CONF_3 0x08 | |
31 | #define REG_IO_CTRL 0x09 | |
32 | #define REG_ENABLE 0x0A | |
33 | #define REG_FLAG 0x0B | |
34 | #define REG_MAX REG_FLAG | |
35 | ||
36 | struct lm3639_chip_data { | |
37 | struct device *dev; | |
38 | struct lm3639_platform_data *pdata; | |
39 | ||
40 | struct backlight_device *bled; | |
41 | struct led_classdev cdev_flash; | |
42 | struct led_classdev cdev_torch; | |
43 | struct regmap *regmap; | |
44 | ||
45 | unsigned int bled_mode; | |
46 | unsigned int bled_map; | |
47 | unsigned int last_flag; | |
48 | }; | |
49 | ||
50 | /* initialize chip */ | |
51 | static int __devinit lm3639_chip_init(struct lm3639_chip_data *pchip) | |
52 | { | |
53 | int ret; | |
54 | unsigned int reg_val; | |
55 | struct lm3639_platform_data *pdata = pchip->pdata; | |
56 | ||
57 | /* input pins config. */ | |
58 | ret = | |
59 | regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x08, | |
60 | pdata->pin_pwm); | |
61 | if (ret < 0) | |
62 | goto out; | |
63 | ||
64 | reg_val = (pdata->pin_pwm & 0x40) | pdata->pin_strobe | pdata->pin_tx; | |
65 | ret = regmap_update_bits(pchip->regmap, REG_IO_CTRL, 0x7C, reg_val); | |
66 | if (ret < 0) | |
67 | goto out; | |
68 | ||
69 | /* init brightness */ | |
70 | ret = regmap_write(pchip->regmap, REG_BL_CONF_4, pdata->init_brt_led); | |
71 | if (ret < 0) | |
72 | goto out; | |
73 | ||
74 | ret = regmap_write(pchip->regmap, REG_BL_CONF_3, pdata->init_brt_led); | |
75 | if (ret < 0) | |
76 | goto out; | |
77 | ||
78 | /* output pins config. */ | |
79 | if (!pdata->init_brt_led) | |
80 | reg_val = pdata->fled_pins | pdata->bled_pins; | |
81 | else | |
82 | reg_val = pdata->fled_pins | pdata->bled_pins | 0x01; | |
83 | ||
84 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x79, reg_val); | |
85 | if (ret < 0) | |
86 | goto out; | |
87 | ||
88 | return ret; | |
89 | out: | |
90 | dev_err(pchip->dev, "i2c failed to access register\n"); | |
91 | return ret; | |
92 | } | |
93 | ||
94 | /* update and get brightness */ | |
95 | static int lm3639_bled_update_status(struct backlight_device *bl) | |
96 | { | |
97 | int ret; | |
98 | unsigned int reg_val; | |
99 | struct lm3639_chip_data *pchip = bl_get_data(bl); | |
100 | struct lm3639_platform_data *pdata = pchip->pdata; | |
101 | ||
102 | ret = regmap_read(pchip->regmap, REG_FLAG, ®_val); | |
103 | if (ret < 0) | |
104 | goto out; | |
105 | ||
106 | if (reg_val != 0) | |
107 | dev_info(pchip->dev, "last flag is 0x%x\n", reg_val); | |
108 | ||
109 | /* pwm control */ | |
110 | if (pdata->pin_pwm) { | |
111 | if (pdata->pwm_set_intensity) | |
112 | pdata->pwm_set_intensity(bl->props.brightness, | |
113 | pdata->max_brt_led); | |
114 | else | |
115 | dev_err(pchip->dev, | |
116 | "No pwm control func. in plat-data\n"); | |
117 | return bl->props.brightness; | |
118 | } | |
119 | ||
120 | /* i2c control and set brigtness */ | |
121 | ret = regmap_write(pchip->regmap, REG_BL_CONF_4, bl->props.brightness); | |
122 | if (ret < 0) | |
123 | goto out; | |
124 | ret = regmap_write(pchip->regmap, REG_BL_CONF_3, bl->props.brightness); | |
125 | if (ret < 0) | |
126 | goto out; | |
127 | ||
128 | if (!bl->props.brightness) | |
129 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x00); | |
130 | else | |
131 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x01); | |
132 | if (ret < 0) | |
133 | goto out; | |
134 | ||
135 | return bl->props.brightness; | |
136 | out: | |
137 | dev_err(pchip->dev, "i2c failed to access registers\n"); | |
138 | return bl->props.brightness; | |
139 | } | |
140 | ||
141 | static int lm3639_bled_get_brightness(struct backlight_device *bl) | |
142 | { | |
143 | int ret; | |
144 | unsigned int reg_val; | |
145 | struct lm3639_chip_data *pchip = bl_get_data(bl); | |
146 | struct lm3639_platform_data *pdata = pchip->pdata; | |
147 | ||
148 | if (pdata->pin_pwm) { | |
149 | if (pdata->pwm_get_intensity) | |
150 | bl->props.brightness = pdata->pwm_get_intensity(); | |
151 | else | |
152 | dev_err(pchip->dev, | |
153 | "No pwm control func. in plat-data\n"); | |
154 | return bl->props.brightness; | |
155 | } | |
156 | ||
157 | ret = regmap_read(pchip->regmap, REG_BL_CONF_1, ®_val); | |
158 | if (ret < 0) | |
159 | goto out; | |
160 | if (reg_val & 0x10) | |
161 | ret = regmap_read(pchip->regmap, REG_BL_CONF_4, ®_val); | |
162 | else | |
163 | ret = regmap_read(pchip->regmap, REG_BL_CONF_3, ®_val); | |
164 | if (ret < 0) | |
165 | goto out; | |
166 | bl->props.brightness = reg_val; | |
167 | ||
168 | return bl->props.brightness; | |
169 | out: | |
170 | dev_err(pchip->dev, "i2c failed to access register\n"); | |
171 | return bl->props.brightness; | |
172 | } | |
173 | ||
174 | static const struct backlight_ops lm3639_bled_ops = { | |
175 | .options = BL_CORE_SUSPENDRESUME, | |
176 | .update_status = lm3639_bled_update_status, | |
177 | .get_brightness = lm3639_bled_get_brightness, | |
178 | }; | |
179 | ||
180 | /* backlight mapping mode */ | |
181 | static ssize_t lm3639_bled_mode_store(struct device *dev, | |
182 | struct device_attribute *devAttr, | |
183 | const char *buf, size_t size) | |
184 | { | |
185 | ssize_t ret; | |
186 | struct lm3639_chip_data *pchip = dev_get_drvdata(dev); | |
187 | unsigned int state; | |
188 | ||
189 | ret = kstrtouint(buf, 10, &state); | |
190 | if (ret) | |
191 | goto out_input; | |
192 | ||
193 | if (!state) | |
194 | ret = | |
195 | regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10, | |
196 | 0x00); | |
197 | else | |
198 | ret = | |
199 | regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10, | |
200 | 0x10); | |
201 | ||
202 | if (ret < 0) | |
203 | goto out; | |
204 | ||
205 | return size; | |
206 | ||
207 | out: | |
208 | dev_err(pchip->dev, "%s:i2c access fail to register\n", __func__); | |
209 | return size; | |
210 | ||
211 | out_input: | |
212 | dev_err(pchip->dev, "%s:input conversion fail\n", __func__); | |
213 | return size; | |
214 | ||
215 | } | |
216 | ||
217 | static DEVICE_ATTR(bled_mode, 0666, NULL, lm3639_bled_mode_store); | |
218 | ||
219 | /* torch */ | |
220 | static void lm3639_torch_brightness_set(struct led_classdev *cdev, | |
221 | enum led_brightness brightness) | |
222 | { | |
223 | int ret; | |
224 | unsigned int reg_val; | |
225 | struct lm3639_chip_data *pchip; | |
226 | ||
227 | pchip = container_of(cdev, struct lm3639_chip_data, cdev_torch); | |
228 | ||
229 | ret = regmap_read(pchip->regmap, REG_FLAG, ®_val); | |
230 | if (ret < 0) | |
231 | goto out; | |
232 | if (reg_val != 0) | |
233 | dev_info(pchip->dev, "last flag is 0x%x\n", reg_val); | |
234 | ||
235 | /* brightness 0 means off state */ | |
236 | if (!brightness) { | |
237 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00); | |
238 | if (ret < 0) | |
239 | goto out; | |
240 | return; | |
241 | } | |
242 | ||
243 | ret = regmap_update_bits(pchip->regmap, | |
244 | REG_FL_CONF_1, 0x70, (brightness - 1) << 4); | |
245 | if (ret < 0) | |
246 | goto out; | |
247 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x02); | |
248 | if (ret < 0) | |
249 | goto out; | |
250 | ||
251 | return; | |
252 | out: | |
253 | dev_err(pchip->dev, "i2c failed to access register\n"); | |
254 | return; | |
255 | } | |
256 | ||
257 | /* flash */ | |
258 | static void lm3639_flash_brightness_set(struct led_classdev *cdev, | |
259 | enum led_brightness brightness) | |
260 | { | |
261 | int ret; | |
262 | unsigned int reg_val; | |
263 | struct lm3639_chip_data *pchip; | |
264 | ||
265 | pchip = container_of(cdev, struct lm3639_chip_data, cdev_flash); | |
266 | ||
267 | ret = regmap_read(pchip->regmap, REG_FLAG, ®_val); | |
268 | if (ret < 0) | |
269 | goto out; | |
270 | if (reg_val != 0) | |
271 | dev_info(pchip->dev, "last flag is 0x%x\n", reg_val); | |
272 | ||
273 | /* torch off before flash control */ | |
274 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00); | |
275 | if (ret < 0) | |
276 | goto out; | |
277 | ||
278 | /* brightness 0 means off state */ | |
279 | if (!brightness) | |
280 | return; | |
281 | ||
282 | ret = regmap_update_bits(pchip->regmap, | |
283 | REG_FL_CONF_1, 0x0F, brightness - 1); | |
284 | if (ret < 0) | |
285 | goto out; | |
286 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x06); | |
287 | if (ret < 0) | |
288 | goto out; | |
289 | ||
290 | return; | |
291 | out: | |
292 | dev_err(pchip->dev, "i2c failed to access register\n"); | |
293 | return; | |
294 | } | |
295 | ||
296 | static const struct regmap_config lm3639_regmap = { | |
297 | .reg_bits = 8, | |
298 | .val_bits = 8, | |
299 | .max_register = REG_MAX, | |
300 | }; | |
301 | ||
302 | static int __devinit lm3639_probe(struct i2c_client *client, | |
303 | const struct i2c_device_id *id) | |
304 | { | |
305 | int ret; | |
306 | struct lm3639_chip_data *pchip; | |
307 | struct lm3639_platform_data *pdata = client->dev.platform_data; | |
308 | struct backlight_properties props; | |
309 | ||
310 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
311 | dev_err(&client->dev, "i2c functionality check fail.\n"); | |
312 | return -EOPNOTSUPP; | |
313 | } | |
314 | ||
315 | if (pdata == NULL) { | |
316 | dev_err(&client->dev, "Needs Platform Data.\n"); | |
317 | return -ENODATA; | |
318 | } | |
319 | ||
320 | pchip = devm_kzalloc(&client->dev, | |
321 | sizeof(struct lm3639_chip_data), GFP_KERNEL); | |
322 | if (!pchip) | |
323 | return -ENOMEM; | |
324 | ||
325 | pchip->pdata = pdata; | |
326 | pchip->dev = &client->dev; | |
327 | ||
328 | pchip->regmap = devm_regmap_init_i2c(client, &lm3639_regmap); | |
329 | if (IS_ERR(pchip->regmap)) { | |
330 | ret = PTR_ERR(pchip->regmap); | |
331 | dev_err(&client->dev, "fail : allocate register map: %d\n", | |
332 | ret); | |
333 | return ret; | |
334 | } | |
335 | i2c_set_clientdata(client, pchip); | |
336 | ||
337 | /* chip initialize */ | |
338 | ret = lm3639_chip_init(pchip); | |
339 | if (ret < 0) { | |
340 | dev_err(&client->dev, "fail : chip init\n"); | |
341 | goto err_out; | |
342 | } | |
343 | ||
344 | /* backlight */ | |
345 | props.type = BACKLIGHT_RAW; | |
346 | props.brightness = pdata->init_brt_led; | |
347 | props.max_brightness = pdata->max_brt_led; | |
348 | pchip->bled = | |
349 | backlight_device_register("lm3639_bled", pchip->dev, pchip, | |
350 | &lm3639_bled_ops, &props); | |
351 | if (IS_ERR(pchip->bled)) { | |
352 | dev_err(&client->dev, "fail : backlight register\n"); | |
353 | ret = -EIO; | |
354 | goto err_out; | |
355 | } | |
356 | ||
357 | ret = device_create_file(&(pchip->bled->dev), &dev_attr_bled_mode); | |
358 | if (ret < 0) { | |
359 | dev_err(&client->dev, "failed : add sysfs entries\n"); | |
360 | ret = -EIO; | |
361 | goto err_bled_mode; | |
362 | } | |
363 | ||
364 | /* flash */ | |
365 | pchip->cdev_flash.name = "lm3639_flash"; | |
366 | pchip->cdev_flash.max_brightness = 16; | |
367 | pchip->cdev_flash.brightness_set = lm3639_flash_brightness_set; | |
368 | ret = led_classdev_register((struct device *) | |
369 | &client->dev, &pchip->cdev_flash); | |
370 | if (ret < 0) { | |
371 | dev_err(&client->dev, "fail : flash register\n"); | |
372 | ret = -EIO; | |
373 | goto err_flash; | |
374 | } | |
375 | ||
376 | /* torch */ | |
377 | pchip->cdev_torch.name = "lm3639_torch"; | |
378 | pchip->cdev_torch.max_brightness = 8; | |
379 | pchip->cdev_torch.brightness_set = lm3639_torch_brightness_set; | |
380 | ret = led_classdev_register((struct device *) | |
381 | &client->dev, &pchip->cdev_torch); | |
382 | if (ret < 0) { | |
383 | dev_err(&client->dev, "fail : torch register\n"); | |
384 | ret = -EIO; | |
385 | goto err_torch; | |
386 | } | |
387 | ||
388 | return 0; | |
389 | ||
390 | err_torch: | |
391 | led_classdev_unregister(&pchip->cdev_flash); | |
392 | err_flash: | |
393 | device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode); | |
394 | err_bled_mode: | |
395 | backlight_device_unregister(pchip->bled); | |
396 | err_out: | |
397 | return ret; | |
398 | } | |
399 | ||
400 | static int __devexit lm3639_remove(struct i2c_client *client) | |
401 | { | |
402 | struct lm3639_chip_data *pchip = i2c_get_clientdata(client); | |
403 | ||
404 | regmap_write(pchip->regmap, REG_ENABLE, 0x00); | |
405 | ||
406 | if (&pchip->cdev_torch) | |
407 | led_classdev_unregister(&pchip->cdev_torch); | |
408 | if (&pchip->cdev_flash) | |
409 | led_classdev_unregister(&pchip->cdev_flash); | |
410 | if (pchip->bled) { | |
411 | device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode); | |
412 | backlight_device_unregister(pchip->bled); | |
413 | } | |
414 | return 0; | |
415 | } | |
416 | ||
417 | static const struct i2c_device_id lm3639_id[] = { | |
418 | {LM3639_NAME, 0}, | |
419 | {} | |
420 | }; | |
421 | ||
422 | MODULE_DEVICE_TABLE(i2c, lm3639_id); | |
423 | static struct i2c_driver lm3639_i2c_driver = { | |
424 | .driver = { | |
425 | .name = LM3639_NAME, | |
426 | }, | |
427 | .probe = lm3639_probe, | |
428 | .remove = __devexit_p(lm3639_remove), | |
429 | .id_table = lm3639_id, | |
430 | }; | |
431 | ||
432 | module_i2c_driver(lm3639_i2c_driver); | |
433 | ||
434 | MODULE_DESCRIPTION("Texas Instruments Backlight+Flash LED driver for LM3639"); | |
435 | MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>"); | |
436 | MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>"); | |
437 | MODULE_LICENSE("GPL v2"); |