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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 */ | |
1b9e450d | 51 | static int lm3639_chip_init(struct lm3639_chip_data *pchip) |
0f59858d SJ |
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. */ | |
0ab7b20f JH |
79 | if (!pdata->init_brt_led) { |
80 | reg_val = pdata->fled_pins; | |
81 | reg_val |= pdata->bled_pins; | |
82 | } else { | |
83 | reg_val = pdata->fled_pins; | |
84 | reg_val |= pdata->bled_pins | 0x01; | |
85 | } | |
0f59858d SJ |
86 | |
87 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x79, reg_val); | |
88 | if (ret < 0) | |
89 | goto out; | |
90 | ||
91 | return ret; | |
92 | out: | |
93 | dev_err(pchip->dev, "i2c failed to access register\n"); | |
94 | return ret; | |
95 | } | |
96 | ||
97 | /* update and get brightness */ | |
98 | static int lm3639_bled_update_status(struct backlight_device *bl) | |
99 | { | |
100 | int ret; | |
101 | unsigned int reg_val; | |
102 | struct lm3639_chip_data *pchip = bl_get_data(bl); | |
103 | struct lm3639_platform_data *pdata = pchip->pdata; | |
104 | ||
105 | ret = regmap_read(pchip->regmap, REG_FLAG, ®_val); | |
106 | if (ret < 0) | |
107 | goto out; | |
108 | ||
109 | if (reg_val != 0) | |
110 | dev_info(pchip->dev, "last flag is 0x%x\n", reg_val); | |
111 | ||
112 | /* pwm control */ | |
113 | if (pdata->pin_pwm) { | |
114 | if (pdata->pwm_set_intensity) | |
115 | pdata->pwm_set_intensity(bl->props.brightness, | |
116 | pdata->max_brt_led); | |
117 | else | |
118 | dev_err(pchip->dev, | |
119 | "No pwm control func. in plat-data\n"); | |
120 | return bl->props.brightness; | |
121 | } | |
122 | ||
123 | /* i2c control and set brigtness */ | |
124 | ret = regmap_write(pchip->regmap, REG_BL_CONF_4, bl->props.brightness); | |
125 | if (ret < 0) | |
126 | goto out; | |
127 | ret = regmap_write(pchip->regmap, REG_BL_CONF_3, bl->props.brightness); | |
128 | if (ret < 0) | |
129 | goto out; | |
130 | ||
131 | if (!bl->props.brightness) | |
132 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x00); | |
133 | else | |
134 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x01); | |
135 | if (ret < 0) | |
136 | goto out; | |
137 | ||
138 | return bl->props.brightness; | |
139 | out: | |
140 | dev_err(pchip->dev, "i2c failed to access registers\n"); | |
141 | return bl->props.brightness; | |
142 | } | |
143 | ||
144 | static int lm3639_bled_get_brightness(struct backlight_device *bl) | |
145 | { | |
146 | int ret; | |
147 | unsigned int reg_val; | |
148 | struct lm3639_chip_data *pchip = bl_get_data(bl); | |
149 | struct lm3639_platform_data *pdata = pchip->pdata; | |
150 | ||
151 | if (pdata->pin_pwm) { | |
152 | if (pdata->pwm_get_intensity) | |
153 | bl->props.brightness = pdata->pwm_get_intensity(); | |
154 | else | |
155 | dev_err(pchip->dev, | |
156 | "No pwm control func. in plat-data\n"); | |
157 | return bl->props.brightness; | |
158 | } | |
159 | ||
160 | ret = regmap_read(pchip->regmap, REG_BL_CONF_1, ®_val); | |
161 | if (ret < 0) | |
162 | goto out; | |
163 | if (reg_val & 0x10) | |
164 | ret = regmap_read(pchip->regmap, REG_BL_CONF_4, ®_val); | |
165 | else | |
166 | ret = regmap_read(pchip->regmap, REG_BL_CONF_3, ®_val); | |
167 | if (ret < 0) | |
168 | goto out; | |
169 | bl->props.brightness = reg_val; | |
170 | ||
171 | return bl->props.brightness; | |
172 | out: | |
173 | dev_err(pchip->dev, "i2c failed to access register\n"); | |
174 | return bl->props.brightness; | |
175 | } | |
176 | ||
177 | static const struct backlight_ops lm3639_bled_ops = { | |
178 | .options = BL_CORE_SUSPENDRESUME, | |
179 | .update_status = lm3639_bled_update_status, | |
180 | .get_brightness = lm3639_bled_get_brightness, | |
181 | }; | |
182 | ||
183 | /* backlight mapping mode */ | |
184 | static ssize_t lm3639_bled_mode_store(struct device *dev, | |
185 | struct device_attribute *devAttr, | |
186 | const char *buf, size_t size) | |
187 | { | |
188 | ssize_t ret; | |
189 | struct lm3639_chip_data *pchip = dev_get_drvdata(dev); | |
190 | unsigned int state; | |
191 | ||
192 | ret = kstrtouint(buf, 10, &state); | |
193 | if (ret) | |
194 | goto out_input; | |
195 | ||
196 | if (!state) | |
197 | ret = | |
198 | regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10, | |
199 | 0x00); | |
200 | else | |
201 | ret = | |
202 | regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10, | |
203 | 0x10); | |
204 | ||
205 | if (ret < 0) | |
206 | goto out; | |
207 | ||
208 | return size; | |
209 | ||
210 | out: | |
211 | dev_err(pchip->dev, "%s:i2c access fail to register\n", __func__); | |
dc36d7e7 | 212 | return ret; |
0f59858d SJ |
213 | |
214 | out_input: | |
215 | dev_err(pchip->dev, "%s:input conversion fail\n", __func__); | |
dc36d7e7 | 216 | return ret; |
0f59858d SJ |
217 | |
218 | } | |
219 | ||
fb08cd9b | 220 | static DEVICE_ATTR(bled_mode, S_IWUSR, NULL, lm3639_bled_mode_store); |
0f59858d SJ |
221 | |
222 | /* torch */ | |
223 | static void lm3639_torch_brightness_set(struct led_classdev *cdev, | |
224 | enum led_brightness brightness) | |
225 | { | |
226 | int ret; | |
227 | unsigned int reg_val; | |
228 | struct lm3639_chip_data *pchip; | |
229 | ||
230 | pchip = container_of(cdev, struct lm3639_chip_data, cdev_torch); | |
231 | ||
232 | ret = regmap_read(pchip->regmap, REG_FLAG, ®_val); | |
233 | if (ret < 0) | |
234 | goto out; | |
235 | if (reg_val != 0) | |
236 | dev_info(pchip->dev, "last flag is 0x%x\n", reg_val); | |
237 | ||
238 | /* brightness 0 means off state */ | |
239 | if (!brightness) { | |
240 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00); | |
241 | if (ret < 0) | |
242 | goto out; | |
243 | return; | |
244 | } | |
245 | ||
246 | ret = regmap_update_bits(pchip->regmap, | |
247 | REG_FL_CONF_1, 0x70, (brightness - 1) << 4); | |
248 | if (ret < 0) | |
249 | goto out; | |
250 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x02); | |
251 | if (ret < 0) | |
252 | goto out; | |
253 | ||
254 | return; | |
255 | out: | |
256 | dev_err(pchip->dev, "i2c failed to access register\n"); | |
0f59858d SJ |
257 | } |
258 | ||
259 | /* flash */ | |
260 | static void lm3639_flash_brightness_set(struct led_classdev *cdev, | |
261 | enum led_brightness brightness) | |
262 | { | |
263 | int ret; | |
264 | unsigned int reg_val; | |
265 | struct lm3639_chip_data *pchip; | |
266 | ||
267 | pchip = container_of(cdev, struct lm3639_chip_data, cdev_flash); | |
268 | ||
269 | ret = regmap_read(pchip->regmap, REG_FLAG, ®_val); | |
270 | if (ret < 0) | |
271 | goto out; | |
272 | if (reg_val != 0) | |
273 | dev_info(pchip->dev, "last flag is 0x%x\n", reg_val); | |
274 | ||
275 | /* torch off before flash control */ | |
276 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00); | |
277 | if (ret < 0) | |
278 | goto out; | |
279 | ||
280 | /* brightness 0 means off state */ | |
281 | if (!brightness) | |
282 | return; | |
283 | ||
284 | ret = regmap_update_bits(pchip->regmap, | |
285 | REG_FL_CONF_1, 0x0F, brightness - 1); | |
286 | if (ret < 0) | |
287 | goto out; | |
288 | ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x06); | |
289 | if (ret < 0) | |
290 | goto out; | |
291 | ||
292 | return; | |
293 | out: | |
294 | dev_err(pchip->dev, "i2c failed to access register\n"); | |
0f59858d SJ |
295 | } |
296 | ||
297 | static const struct regmap_config lm3639_regmap = { | |
298 | .reg_bits = 8, | |
299 | .val_bits = 8, | |
300 | .max_register = REG_MAX, | |
301 | }; | |
302 | ||
1b9e450d | 303 | static int lm3639_probe(struct i2c_client *client, |
0f59858d SJ |
304 | const struct i2c_device_id *id) |
305 | { | |
306 | int ret; | |
307 | struct lm3639_chip_data *pchip; | |
c512794c | 308 | struct lm3639_platform_data *pdata = dev_get_platdata(&client->dev); |
0f59858d SJ |
309 | struct backlight_properties props; |
310 | ||
311 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
312 | dev_err(&client->dev, "i2c functionality check fail.\n"); | |
313 | return -EOPNOTSUPP; | |
314 | } | |
315 | ||
316 | if (pdata == NULL) { | |
317 | dev_err(&client->dev, "Needs Platform Data.\n"); | |
318 | return -ENODATA; | |
319 | } | |
320 | ||
321 | pchip = devm_kzalloc(&client->dev, | |
322 | sizeof(struct lm3639_chip_data), GFP_KERNEL); | |
323 | if (!pchip) | |
324 | return -ENOMEM; | |
325 | ||
326 | pchip->pdata = pdata; | |
327 | pchip->dev = &client->dev; | |
328 | ||
329 | pchip->regmap = devm_regmap_init_i2c(client, &lm3639_regmap); | |
330 | if (IS_ERR(pchip->regmap)) { | |
331 | ret = PTR_ERR(pchip->regmap); | |
332 | dev_err(&client->dev, "fail : allocate register map: %d\n", | |
333 | ret); | |
334 | return ret; | |
335 | } | |
336 | i2c_set_clientdata(client, pchip); | |
337 | ||
338 | /* chip initialize */ | |
339 | ret = lm3639_chip_init(pchip); | |
340 | if (ret < 0) { | |
341 | dev_err(&client->dev, "fail : chip init\n"); | |
342 | goto err_out; | |
343 | } | |
344 | ||
345 | /* backlight */ | |
346 | props.type = BACKLIGHT_RAW; | |
347 | props.brightness = pdata->init_brt_led; | |
348 | props.max_brightness = pdata->max_brt_led; | |
349 | pchip->bled = | |
f1740e4c DJ |
350 | devm_backlight_device_register(pchip->dev, "lm3639_bled", |
351 | pchip->dev, pchip, &lm3639_bled_ops, | |
352 | &props); | |
0f59858d SJ |
353 | if (IS_ERR(pchip->bled)) { |
354 | dev_err(&client->dev, "fail : backlight register\n"); | |
aea00a6c | 355 | ret = PTR_ERR(pchip->bled); |
0f59858d SJ |
356 | goto err_out; |
357 | } | |
358 | ||
359 | ret = device_create_file(&(pchip->bled->dev), &dev_attr_bled_mode); | |
360 | if (ret < 0) { | |
361 | dev_err(&client->dev, "failed : add sysfs entries\n"); | |
f1740e4c | 362 | goto err_out; |
0f59858d SJ |
363 | } |
364 | ||
365 | /* flash */ | |
366 | pchip->cdev_flash.name = "lm3639_flash"; | |
367 | pchip->cdev_flash.max_brightness = 16; | |
368 | pchip->cdev_flash.brightness_set = lm3639_flash_brightness_set; | |
369 | ret = led_classdev_register((struct device *) | |
370 | &client->dev, &pchip->cdev_flash); | |
371 | if (ret < 0) { | |
372 | dev_err(&client->dev, "fail : flash register\n"); | |
0f59858d SJ |
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"); | |
0f59858d SJ |
384 | goto err_torch; |
385 | } | |
386 | ||
387 | return 0; | |
388 | ||
389 | err_torch: | |
390 | led_classdev_unregister(&pchip->cdev_flash); | |
391 | err_flash: | |
392 | device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode); | |
0f59858d SJ |
393 | err_out: |
394 | return ret; | |
395 | } | |
396 | ||
7e4b9d0b | 397 | static int lm3639_remove(struct i2c_client *client) |
0f59858d SJ |
398 | { |
399 | struct lm3639_chip_data *pchip = i2c_get_clientdata(client); | |
400 | ||
401 | regmap_write(pchip->regmap, REG_ENABLE, 0x00); | |
402 | ||
403 | if (&pchip->cdev_torch) | |
404 | led_classdev_unregister(&pchip->cdev_torch); | |
405 | if (&pchip->cdev_flash) | |
406 | led_classdev_unregister(&pchip->cdev_flash); | |
f1740e4c | 407 | if (pchip->bled) |
0f59858d | 408 | device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode); |
0f59858d SJ |
409 | return 0; |
410 | } | |
411 | ||
412 | static const struct i2c_device_id lm3639_id[] = { | |
413 | {LM3639_NAME, 0}, | |
414 | {} | |
415 | }; | |
416 | ||
417 | MODULE_DEVICE_TABLE(i2c, lm3639_id); | |
418 | static struct i2c_driver lm3639_i2c_driver = { | |
419 | .driver = { | |
420 | .name = LM3639_NAME, | |
421 | }, | |
422 | .probe = lm3639_probe, | |
d1723fa2 | 423 | .remove = lm3639_remove, |
0f59858d SJ |
424 | .id_table = lm3639_id, |
425 | }; | |
426 | ||
427 | module_i2c_driver(lm3639_i2c_driver); | |
428 | ||
429 | MODULE_DESCRIPTION("Texas Instruments Backlight+Flash LED driver for LM3639"); | |
f1740e4c DJ |
430 | MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>"); |
431 | MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>"); | |
0f59858d | 432 | MODULE_LICENSE("GPL v2"); |