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8b7cfbec SJ |
1 | /* |
2 | * Simple driver for Texas Instruments LM3642 LED Flash 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/delay.h> | |
12 | #include <linux/i2c.h> | |
13 | #include <linux/leds.h> | |
14 | #include <linux/slab.h> | |
15 | #include <linux/platform_device.h> | |
16 | #include <linux/fs.h> | |
17 | #include <linux/regmap.h> | |
18 | #include <linux/workqueue.h> | |
19 | #include <linux/platform_data/leds-lm3642.h> | |
20 | ||
21 | #define REG_FILT_TIME (0x0) | |
22 | #define REG_IVFM_MODE (0x1) | |
23 | #define REG_TORCH_TIME (0x6) | |
24 | #define REG_FLASH (0x8) | |
25 | #define REG_I_CTRL (0x9) | |
26 | #define REG_ENABLE (0xA) | |
27 | #define REG_FLAG (0xB) | |
28 | #define REG_MAX (0xB) | |
29 | ||
30 | #define UVLO_EN_SHIFT (7) | |
31 | #define IVM_D_TH_SHIFT (2) | |
32 | #define TORCH_RAMP_UP_TIME_SHIFT (3) | |
33 | #define TORCH_RAMP_DN_TIME_SHIFT (0) | |
34 | #define INDUCTOR_I_LIMIT_SHIFT (6) | |
35 | #define FLASH_RAMP_TIME_SHIFT (3) | |
36 | #define FLASH_TOUT_TIME_SHIFT (0) | |
37 | #define TORCH_I_SHIFT (4) | |
38 | #define FLASH_I_SHIFT (0) | |
39 | #define IVFM_SHIFT (7) | |
40 | #define TX_PIN_EN_SHIFT (6) | |
41 | #define STROBE_PIN_EN_SHIFT (5) | |
42 | #define TORCH_PIN_EN_SHIFT (4) | |
43 | #define MODE_BITS_SHIFT (0) | |
44 | ||
45 | #define UVLO_EN_MASK (0x1) | |
46 | #define IVM_D_TH_MASK (0x7) | |
47 | #define TORCH_RAMP_UP_TIME_MASK (0x7) | |
48 | #define TORCH_RAMP_DN_TIME_MASK (0x7) | |
49 | #define INDUCTOR_I_LIMIT_MASK (0x1) | |
50 | #define FLASH_RAMP_TIME_MASK (0x7) | |
51 | #define FLASH_TOUT_TIME_MASK (0x7) | |
52 | #define TORCH_I_MASK (0x7) | |
53 | #define FLASH_I_MASK (0xF) | |
54 | #define IVFM_MASK (0x1) | |
55 | #define TX_PIN_EN_MASK (0x1) | |
56 | #define STROBE_PIN_EN_MASK (0x1) | |
57 | #define TORCH_PIN_EN_MASK (0x1) | |
58 | #define MODE_BITS_MASK (0x73) | |
59 | #define EX_PIN_CONTROL_MASK (0x71) | |
60 | #define EX_PIN_ENABLE_MASK (0x70) | |
61 | ||
62 | enum lm3642_mode { | |
63 | MODES_STASNDBY = 0, | |
64 | MODES_INDIC, | |
65 | MODES_TORCH, | |
66 | MODES_FLASH | |
67 | }; | |
68 | ||
69 | struct lm3642_chip_data { | |
70 | struct device *dev; | |
71 | ||
72 | struct led_classdev cdev_flash; | |
73 | struct led_classdev cdev_torch; | |
74 | struct led_classdev cdev_indicator; | |
75 | ||
76 | struct work_struct work_flash; | |
77 | struct work_struct work_torch; | |
78 | struct work_struct work_indicator; | |
79 | ||
80 | u8 br_flash; | |
81 | u8 br_torch; | |
82 | u8 br_indicator; | |
83 | ||
84 | enum lm3642_torch_pin_enable torch_pin; | |
85 | enum lm3642_strobe_pin_enable strobe_pin; | |
86 | enum lm3642_tx_pin_enable tx_pin; | |
87 | ||
88 | struct lm3642_platform_data *pdata; | |
89 | struct regmap *regmap; | |
90 | struct mutex lock; | |
91 | ||
92 | unsigned int last_flag; | |
93 | }; | |
94 | ||
95 | /* chip initialize */ | |
96 | static int __devinit lm3642_chip_init(struct lm3642_chip_data *chip) | |
97 | { | |
98 | unsigned int reg_val; | |
99 | int ret; | |
100 | struct lm3642_platform_data *pdata = chip->pdata; | |
101 | ||
102 | /* set enable register */ | |
103 | ret = regmap_read(chip->regmap, REG_ENABLE, ®_val); | |
104 | if (ret < 0) | |
105 | goto out; | |
106 | ||
107 | reg_val &= (~EX_PIN_ENABLE_MASK); | |
108 | reg_val |= pdata->tx_pin; | |
109 | ret = regmap_write(chip->regmap, REG_ENABLE, reg_val); | |
110 | if (ret < 0) | |
111 | goto out; | |
112 | ||
113 | out: | |
114 | dev_err(chip->dev, "Failed to read REG_ENABLE Register\n"); | |
115 | return ret; | |
116 | } | |
117 | ||
118 | /* chip control */ | |
119 | static int lm3642_control(struct lm3642_chip_data *chip, | |
120 | u8 brightness, enum lm3642_mode opmode) | |
121 | { | |
122 | int ret; | |
123 | ||
124 | ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag); | |
125 | if (ret < 0) { | |
126 | dev_err(chip->dev, "Failed to read REG_FLAG Register\n"); | |
127 | goto out; | |
128 | } | |
129 | ||
130 | if (chip->last_flag) | |
131 | dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag); | |
132 | ||
133 | /* brightness 0 means off-state */ | |
134 | if (!brightness) | |
135 | opmode = MODES_STASNDBY; | |
136 | ||
137 | switch (opmode) { | |
138 | case MODES_TORCH: | |
139 | ret = regmap_update_bits(chip->regmap, REG_I_CTRL, | |
140 | TORCH_I_MASK << TORCH_I_SHIFT, | |
141 | (brightness - 1) << TORCH_I_SHIFT); | |
142 | ||
143 | if (chip->torch_pin) | |
144 | opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT); | |
145 | break; | |
146 | ||
147 | case MODES_FLASH: | |
148 | ret = regmap_update_bits(chip->regmap, REG_I_CTRL, | |
149 | FLASH_I_MASK << FLASH_I_SHIFT, | |
150 | (brightness - 1) << FLASH_I_SHIFT); | |
151 | ||
152 | if (chip->strobe_pin) | |
153 | opmode |= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT); | |
154 | break; | |
155 | ||
156 | case MODES_INDIC: | |
157 | ret = regmap_update_bits(chip->regmap, REG_I_CTRL, | |
158 | TORCH_I_MASK << TORCH_I_SHIFT, | |
159 | (brightness - 1) << TORCH_I_SHIFT); | |
160 | break; | |
161 | ||
162 | case MODES_STASNDBY: | |
163 | ||
164 | break; | |
165 | ||
166 | default: | |
167 | return ret; | |
168 | } | |
169 | if (ret < 0) { | |
170 | dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n"); | |
171 | goto out; | |
172 | } | |
173 | ||
174 | if (chip->tx_pin) | |
175 | opmode |= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT); | |
176 | ||
177 | ret = regmap_update_bits(chip->regmap, REG_ENABLE, | |
178 | MODE_BITS_MASK << MODE_BITS_SHIFT, | |
179 | opmode << MODE_BITS_SHIFT); | |
180 | out: | |
181 | return ret; | |
182 | } | |
183 | ||
184 | /* torch */ | |
185 | ||
186 | /* torch pin config for lm3642*/ | |
187 | static ssize_t lm3642_torch_pin_store(struct device *dev, | |
188 | struct device_attribute *devAttr, | |
189 | const char *buf, size_t size) | |
190 | { | |
191 | ssize_t ret; | |
192 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
193 | struct lm3642_chip_data *chip = | |
194 | container_of(led_cdev, struct lm3642_chip_data, cdev_indicator); | |
195 | unsigned int state; | |
196 | ||
197 | ret = kstrtouint(buf, 10, &state); | |
198 | if (ret) | |
199 | goto out_strtoint; | |
200 | if (state != 0) | |
201 | state = 0x01 << TORCH_PIN_EN_SHIFT; | |
202 | ||
203 | chip->torch_pin = state; | |
204 | ret = regmap_update_bits(chip->regmap, REG_ENABLE, | |
205 | TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT, | |
206 | state); | |
207 | if (ret < 0) | |
208 | goto out; | |
209 | ||
210 | return size; | |
211 | out: | |
212 | dev_err(chip->dev, "%s:i2c access fail to register\n", __func__); | |
213 | return size; | |
214 | out_strtoint: | |
215 | dev_err(chip->dev, "%s: fail to change str to int\n", __func__); | |
216 | return size; | |
217 | } | |
218 | ||
219 | static DEVICE_ATTR(torch_pin, 0666, NULL, lm3642_torch_pin_store); | |
220 | ||
221 | static void lm3642_deferred_torch_brightness_set(struct work_struct *work) | |
222 | { | |
223 | struct lm3642_chip_data *chip = | |
224 | container_of(work, struct lm3642_chip_data, work_torch); | |
225 | ||
226 | mutex_lock(&chip->lock); | |
227 | lm3642_control(chip, chip->br_torch, MODES_TORCH); | |
228 | mutex_unlock(&chip->lock); | |
229 | } | |
230 | ||
231 | static void lm3642_torch_brightness_set(struct led_classdev *cdev, | |
232 | enum led_brightness brightness) | |
233 | { | |
234 | struct lm3642_chip_data *chip = | |
235 | container_of(cdev, struct lm3642_chip_data, cdev_torch); | |
236 | ||
237 | chip->br_torch = brightness; | |
238 | schedule_work(&chip->work_torch); | |
239 | } | |
240 | ||
241 | /* flash */ | |
242 | ||
243 | /* strobe pin config for lm3642*/ | |
244 | static ssize_t lm3642_strobe_pin_store(struct device *dev, | |
245 | struct device_attribute *devAttr, | |
246 | const char *buf, size_t size) | |
247 | { | |
248 | ssize_t ret; | |
249 | struct led_classdev *led_cdev = dev_get_drvdata(dev); | |
250 | struct lm3642_chip_data *chip = | |
251 | container_of(led_cdev, struct lm3642_chip_data, cdev_indicator); | |
252 | unsigned int state; | |
253 | ||
254 | ret = kstrtouint(buf, 10, &state); | |
255 | if (ret) | |
256 | goto out_strtoint; | |
257 | if (state != 0) | |
258 | state = 0x01 << STROBE_PIN_EN_SHIFT; | |
259 | ||
260 | chip->strobe_pin = state; | |
261 | ret = regmap_update_bits(chip->regmap, REG_ENABLE, | |
262 | STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT, | |
263 | state); | |
264 | if (ret < 0) | |
265 | goto out; | |
266 | ||
267 | return size; | |
268 | out: | |
269 | dev_err(chip->dev, "%s:i2c access fail to register\n", __func__); | |
270 | return size; | |
271 | out_strtoint: | |
272 | dev_err(chip->dev, "%s: fail to change str to int\n", __func__); | |
273 | return size; | |
274 | } | |
275 | ||
276 | static DEVICE_ATTR(strobe_pin, 0666, NULL, lm3642_strobe_pin_store); | |
277 | ||
278 | static void lm3642_deferred_strobe_brightness_set(struct work_struct *work) | |
279 | { | |
280 | struct lm3642_chip_data *chip = | |
281 | container_of(work, struct lm3642_chip_data, work_flash); | |
282 | ||
283 | mutex_lock(&chip->lock); | |
284 | lm3642_control(chip, chip->br_flash, MODES_FLASH); | |
285 | mutex_unlock(&chip->lock); | |
286 | } | |
287 | ||
288 | static void lm3642_strobe_brightness_set(struct led_classdev *cdev, | |
289 | enum led_brightness brightness) | |
290 | { | |
291 | struct lm3642_chip_data *chip = | |
292 | container_of(cdev, struct lm3642_chip_data, cdev_flash); | |
293 | ||
294 | chip->br_flash = brightness; | |
295 | schedule_work(&chip->work_flash); | |
296 | } | |
297 | ||
298 | /* indicator */ | |
299 | static void lm3642_deferred_indicator_brightness_set(struct work_struct *work) | |
300 | { | |
301 | struct lm3642_chip_data *chip = | |
302 | container_of(work, struct lm3642_chip_data, work_indicator); | |
303 | ||
304 | mutex_lock(&chip->lock); | |
305 | lm3642_control(chip, chip->br_indicator, MODES_INDIC); | |
306 | mutex_unlock(&chip->lock); | |
307 | } | |
308 | ||
309 | static void lm3642_indicator_brightness_set(struct led_classdev *cdev, | |
310 | enum led_brightness brightness) | |
311 | { | |
312 | struct lm3642_chip_data *chip = | |
313 | container_of(cdev, struct lm3642_chip_data, cdev_indicator); | |
314 | ||
315 | chip->br_indicator = brightness; | |
316 | schedule_work(&chip->work_indicator); | |
317 | } | |
318 | ||
319 | static const struct regmap_config lm3642_regmap = { | |
320 | .reg_bits = 8, | |
321 | .val_bits = 8, | |
322 | .max_register = REG_MAX, | |
323 | }; | |
324 | ||
325 | static int __devinit lm3642_probe(struct i2c_client *client, | |
326 | const struct i2c_device_id *id) | |
327 | { | |
328 | struct lm3642_platform_data *pdata = client->dev.platform_data; | |
329 | struct lm3642_chip_data *chip; | |
330 | ||
331 | int err; | |
332 | ||
333 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { | |
334 | dev_err(&client->dev, "i2c functionality check fail.\n"); | |
335 | return -EOPNOTSUPP; | |
336 | } | |
337 | ||
338 | if (pdata == NULL) { | |
339 | dev_err(&client->dev, "needs Platform Data.\n"); | |
340 | return -ENODATA; | |
341 | } | |
342 | ||
343 | chip = devm_kzalloc(&client->dev, | |
344 | sizeof(struct lm3642_chip_data), GFP_KERNEL); | |
345 | if (!chip) | |
346 | return -ENOMEM; | |
347 | ||
348 | chip->dev = &client->dev; | |
349 | chip->pdata = pdata; | |
350 | ||
351 | chip->tx_pin = pdata->tx_pin; | |
352 | chip->torch_pin = pdata->torch_pin; | |
353 | chip->strobe_pin = pdata->strobe_pin; | |
354 | ||
355 | chip->regmap = devm_regmap_init_i2c(client, &lm3642_regmap); | |
356 | if (IS_ERR(chip->regmap)) { | |
357 | err = PTR_ERR(chip->regmap); | |
358 | dev_err(&client->dev, "Failed to allocate register map: %d\n", | |
359 | err); | |
360 | return err; | |
361 | } | |
362 | ||
363 | mutex_init(&chip->lock); | |
364 | i2c_set_clientdata(client, chip); | |
365 | ||
366 | err = lm3642_chip_init(chip); | |
367 | if (err < 0) | |
368 | goto err_out; | |
369 | ||
370 | /* flash */ | |
371 | INIT_WORK(&chip->work_flash, lm3642_deferred_strobe_brightness_set); | |
372 | chip->cdev_flash.name = "flash"; | |
373 | chip->cdev_flash.max_brightness = 16; | |
374 | chip->cdev_flash.brightness_set = lm3642_strobe_brightness_set; | |
375 | err = led_classdev_register((struct device *) | |
376 | &client->dev, &chip->cdev_flash); | |
377 | if (err < 0) { | |
378 | dev_err(chip->dev, "failed to register flash\n"); | |
379 | goto err_out; | |
380 | } | |
381 | err = device_create_file(chip->cdev_flash.dev, &dev_attr_strobe_pin); | |
382 | if (err < 0) { | |
383 | dev_err(chip->dev, "failed to create strobe-pin file\n"); | |
384 | goto err_create_flash_pin_file; | |
385 | } | |
386 | ||
387 | /* torch */ | |
388 | INIT_WORK(&chip->work_torch, lm3642_deferred_torch_brightness_set); | |
389 | chip->cdev_torch.name = "torch"; | |
390 | chip->cdev_torch.max_brightness = 8; | |
391 | chip->cdev_torch.brightness_set = lm3642_torch_brightness_set; | |
392 | err = led_classdev_register((struct device *) | |
393 | &client->dev, &chip->cdev_torch); | |
394 | if (err < 0) { | |
395 | dev_err(chip->dev, "failed to register torch\n"); | |
396 | goto err_create_torch_file; | |
397 | } | |
398 | err = device_create_file(chip->cdev_torch.dev, &dev_attr_torch_pin); | |
399 | if (err < 0) { | |
400 | dev_err(chip->dev, "failed to create torch-pin file\n"); | |
401 | goto err_create_torch_pin_file; | |
402 | } | |
403 | ||
404 | /* indicator */ | |
405 | INIT_WORK(&chip->work_indicator, | |
406 | lm3642_deferred_indicator_brightness_set); | |
407 | chip->cdev_indicator.name = "indicator"; | |
408 | chip->cdev_indicator.max_brightness = 8; | |
409 | chip->cdev_indicator.brightness_set = lm3642_indicator_brightness_set; | |
410 | err = led_classdev_register((struct device *) | |
411 | &client->dev, &chip->cdev_indicator); | |
412 | if (err < 0) { | |
413 | dev_err(chip->dev, "failed to register indicator\n"); | |
414 | goto err_create_indicator_file; | |
415 | } | |
416 | ||
417 | dev_info(&client->dev, "LM3642 is initialized\n"); | |
418 | return 0; | |
419 | ||
420 | err_create_indicator_file: | |
421 | device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin); | |
422 | err_create_torch_pin_file: | |
423 | led_classdev_unregister(&chip->cdev_torch); | |
424 | err_create_torch_file: | |
425 | device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin); | |
426 | err_create_flash_pin_file: | |
427 | led_classdev_unregister(&chip->cdev_flash); | |
428 | err_out: | |
429 | return err; | |
430 | } | |
431 | ||
432 | static int __devexit lm3642_remove(struct i2c_client *client) | |
433 | { | |
434 | struct lm3642_chip_data *chip = i2c_get_clientdata(client); | |
435 | ||
436 | led_classdev_unregister(&chip->cdev_indicator); | |
437 | flush_work(&chip->work_indicator); | |
438 | device_remove_file(chip->cdev_torch.dev, &dev_attr_torch_pin); | |
439 | led_classdev_unregister(&chip->cdev_torch); | |
440 | flush_work(&chip->work_torch); | |
441 | device_remove_file(chip->cdev_flash.dev, &dev_attr_strobe_pin); | |
442 | led_classdev_unregister(&chip->cdev_flash); | |
443 | flush_work(&chip->work_flash); | |
444 | regmap_write(chip->regmap, REG_ENABLE, 0); | |
445 | return 0; | |
446 | } | |
447 | ||
448 | static const struct i2c_device_id lm3642_id[] = { | |
449 | {LM3642_NAME, 0}, | |
450 | {} | |
451 | }; | |
452 | ||
453 | MODULE_DEVICE_TABLE(i2c, lm3642_id); | |
454 | ||
455 | static struct i2c_driver lm3642_i2c_driver = { | |
456 | .driver = { | |
457 | .name = LM3642_NAME, | |
458 | .owner = THIS_MODULE, | |
459 | .pm = NULL, | |
460 | }, | |
461 | .probe = lm3642_probe, | |
462 | .remove = __devexit_p(lm3642_remove), | |
463 | .id_table = lm3642_id, | |
464 | }; | |
465 | ||
466 | module_i2c_driver(lm3642_i2c_driver); | |
467 | ||
468 | MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642"); | |
469 | MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>"); | |
470 | MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>"); | |
471 | MODULE_LICENSE("GPL v2"); |