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1 | /* |
2 | * Simple driver for Texas Instruments LM355x 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/gpio.h> |
14 | #include <linux/leds.h> |
15 | #include <linux/slab.h> |
16 | #include <linux/platform_device.h> |
17 | #include <linux/fs.h> |
18 | #include <linux/regmap.h> |
19 | #include <linux/workqueue.h> |
20 | #include <linux/platform_data/leds-lm355x.h> |
21 | |
22 | enum lm355x_type { |
23 | CHIP_LM3554 = 0, |
24 | CHIP_LM3556, |
25 | }; |
26 | |
27 | enum lm355x_regs { |
28 | REG_FLAG = 0, |
29 | REG_TORCH_CFG, |
30 | REG_TORCH_CTRL, |
31 | REG_STROBE_CFG, |
32 | REG_FLASH_CTRL, |
33 | REG_INDI_CFG, |
34 | REG_INDI_CTRL, |
35 | REG_OPMODE, |
36 | REG_MAX, |
37 | }; |
38 | |
39 | /* operation mode */ |
40 | enum lm355x_mode { |
41 | MODE_SHDN = 0, |
42 | MODE_INDIC, |
43 | MODE_TORCH, |
44 | MODE_FLASH |
45 | }; |
46 | |
47 | /* register map info. */ |
48 | struct lm355x_reg_data { |
49 | u8 regno; |
50 | u8 mask; |
51 | u8 shift; |
52 | }; |
53 | |
54 | struct lm355x_chip_data { |
55 | struct device *dev; |
56 | enum lm355x_type type; |
57 | |
58 | struct led_classdev cdev_flash; |
59 | struct led_classdev cdev_torch; |
60 | struct led_classdev cdev_indicator; |
61 | |
62 | struct work_struct work_flash; |
63 | struct work_struct work_torch; |
64 | struct work_struct work_indicator; |
65 | |
66 | u8 br_flash; |
67 | u8 br_torch; |
68 | u8 br_indicator; |
69 | |
70 | struct lm355x_platform_data *pdata; |
71 | struct regmap *regmap; |
72 | struct mutex lock; |
73 | |
74 | unsigned int last_flag; |
75 | struct lm355x_reg_data *regs; |
76 | }; |
77 | |
78 | /* specific indicator function for lm3556 */ |
79 | enum lm3556_indic_pulse_time { |
80 | PULSE_TIME_0_MS = 0, |
81 | PULSE_TIME_32_MS, |
82 | PULSE_TIME_64_MS, |
83 | PULSE_TIME_92_MS, |
84 | PULSE_TIME_128_MS, |
85 | PULSE_TIME_160_MS, |
86 | PULSE_TIME_196_MS, |
87 | PULSE_TIME_224_MS, |
88 | PULSE_TIME_256_MS, |
89 | PULSE_TIME_288_MS, |
90 | PULSE_TIME_320_MS, |
91 | PULSE_TIME_352_MS, |
92 | PULSE_TIME_384_MS, |
93 | PULSE_TIME_416_MS, |
94 | PULSE_TIME_448_MS, |
95 | PULSE_TIME_480_MS, |
96 | }; |
97 | |
98 | enum lm3556_indic_n_blank { |
99 | INDIC_N_BLANK_0 = 0, |
100 | INDIC_N_BLANK_1, |
101 | INDIC_N_BLANK_2, |
102 | INDIC_N_BLANK_3, |
103 | INDIC_N_BLANK_4, |
104 | INDIC_N_BLANK_5, |
105 | INDIC_N_BLANK_6, |
106 | INDIC_N_BLANK_7, |
107 | INDIC_N_BLANK_8, |
108 | INDIC_N_BLANK_9, |
109 | INDIC_N_BLANK_10, |
110 | INDIC_N_BLANK_11, |
111 | INDIC_N_BLANK_12, |
112 | INDIC_N_BLANK_13, |
113 | INDIC_N_BLANK_14, |
114 | INDIC_N_BLANK_15, |
115 | }; |
116 | |
117 | enum lm3556_indic_period { |
118 | INDIC_PERIOD_0 = 0, |
119 | INDIC_PERIOD_1, |
120 | INDIC_PERIOD_2, |
121 | INDIC_PERIOD_3, |
122 | INDIC_PERIOD_4, |
123 | INDIC_PERIOD_5, |
124 | INDIC_PERIOD_6, |
125 | INDIC_PERIOD_7, |
126 | }; |
127 | |
128 | #define INDIC_PATTERN_SIZE 4 |
129 | |
130 | struct indicator { |
131 | u8 blinking; |
132 | u8 period_cnt; |
133 | }; |
134 | |
135 | /* indicator pattern data only for lm3556 */ |
136 | static struct indicator indicator_pattern[INDIC_PATTERN_SIZE] = { |
137 | [0] = {(INDIC_N_BLANK_1 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_1}, |
138 | [1] = {(INDIC_N_BLANK_15 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_2}, |
139 | [2] = {(INDIC_N_BLANK_10 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_4}, |
140 | [3] = {(INDIC_N_BLANK_5 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_7}, |
141 | }; |
142 | |
143 | static struct lm355x_reg_data lm3554_regs[REG_MAX] = { |
144 | [REG_FLAG] = {0xD0, 0xBF, 0}, |
145 | [REG_TORCH_CFG] = {0xE0, 0x80, 7}, |
146 | [REG_TORCH_CTRL] = {0xA0, 0x38, 3}, |
147 | [REG_STROBE_CFG] = {0xE0, 0x04, 2}, |
148 | [REG_FLASH_CTRL] = {0xB0, 0x78, 3}, |
149 | [REG_INDI_CFG] = {0xE0, 0x08, 3}, |
150 | [REG_INDI_CTRL] = {0xA0, 0xC0, 6}, |
151 | [REG_OPMODE] = {0xA0, 0x03, 0}, |
152 | }; |
153 | |
154 | static struct lm355x_reg_data lm3556_regs[REG_MAX] = { |
155 | [REG_FLAG] = {0x0B, 0xFF, 0}, |
156 | [REG_TORCH_CFG] = {0x0A, 0x10, 4}, |
157 | [REG_TORCH_CTRL] = {0x09, 0x70, 4}, |
158 | [REG_STROBE_CFG] = {0x0A, 0x20, 5}, |
159 | [REG_FLASH_CTRL] = {0x09, 0x0F, 0}, |
160 | [REG_INDI_CFG] = {0xFF, 0xFF, 0}, |
161 | [REG_INDI_CTRL] = {0x09, 0x70, 4}, |
162 | [REG_OPMODE] = {0x0A, 0x03, 0}, |
163 | }; |
164 | |
165 | static char lm355x_name[][I2C_NAME_SIZE] = { |
166 | [CHIP_LM3554] = LM3554_NAME, |
167 | [CHIP_LM3556] = LM3556_NAME, |
168 | }; |
169 | |
170 | /* chip initialize */ |
171 | static int lm355x_chip_init(struct lm355x_chip_data *chip) |
172 | { |
173 | int ret; |
174 | unsigned int reg_val; |
175 | struct lm355x_platform_data *pdata = chip->pdata; |
176 | |
177 | /* input and output pins configuration */ |
178 | switch (chip->type) { |
179 | case CHIP_LM3554: |
180 | reg_val = pdata->pin_tx2 | pdata->ntc_pin; |
181 | ret = regmap_update_bits(chip->regmap, 0xE0, 0x28, reg_val); |
182 | if (ret < 0) |
183 | goto out; |
184 | reg_val = pdata->pass_mode; |
185 | ret = regmap_update_bits(chip->regmap, 0xA0, 0x04, reg_val); |
186 | if (ret < 0) |
187 | goto out; |
188 | break; |
189 | |
190 | case CHIP_LM3556: |
191 | reg_val = pdata->pin_tx2 | pdata->ntc_pin | pdata->pass_mode; |
192 | ret = regmap_update_bits(chip->regmap, 0x0A, 0xC4, reg_val); |
193 | if (ret < 0) |
194 | goto out; |
195 | break; |
196 | default: |
197 | return -ENODATA; |
198 | } |
199 | |
200 | return ret; |
201 | out: |
202 | dev_err(chip->dev, "%s:i2c access fail to register\n", __func__); |
203 | return ret; |
204 | } |
205 | |
206 | /* chip control */ |
207 | static void lm355x_control(struct lm355x_chip_data *chip, |
208 | u8 brightness, enum lm355x_mode opmode) |
209 | { |
210 | int ret; |
211 | unsigned int reg_val; |
212 | struct lm355x_platform_data *pdata = chip->pdata; |
213 | struct lm355x_reg_data *preg = chip->regs; |
214 | |
215 | ret = regmap_read(chip->regmap, preg[REG_FLAG].regno, &chip->last_flag); |
216 | if (ret < 0) |
217 | goto out; |
218 | if (chip->last_flag & preg[REG_FLAG].mask) |
219 | dev_info(chip->dev, "%s Last FLAG is 0x%x\n", |
220 | lm355x_name[chip->type], |
221 | chip->last_flag & preg[REG_FLAG].mask); |
222 | /* brightness 0 means shutdown */ |
223 | if (!brightness) |
224 | opmode = MODE_SHDN; |
225 | |
226 | switch (opmode) { |
227 | case MODE_TORCH: |
228 | ret = |
229 | regmap_update_bits(chip->regmap, preg[REG_TORCH_CTRL].regno, |
230 | preg[REG_TORCH_CTRL].mask, |
231 | (brightness - 1) |
232 | << preg[REG_TORCH_CTRL].shift); |
233 | if (ret < 0) |
234 | goto out; |
235 | |
236 | if (pdata->pin_tx1 != LM355x_PIN_TORCH_DISABLE) { |
237 | ret = |
238 | regmap_update_bits(chip->regmap, |
239 | preg[REG_TORCH_CFG].regno, |
240 | preg[REG_TORCH_CFG].mask, |
241 | 0x01 << |
242 | preg[REG_TORCH_CFG].shift); |
243 | if (ret < 0) |
244 | goto out; |
245 | opmode = MODE_SHDN; |
246 | dev_info(chip->dev, |
247 | "torch brt is set - ext. torch pin mode\n"); |
248 | } |
249 | break; |
250 | |
251 | case MODE_FLASH: |
252 | |
253 | ret = |
254 | regmap_update_bits(chip->regmap, preg[REG_FLASH_CTRL].regno, |
255 | preg[REG_FLASH_CTRL].mask, |
256 | (brightness - 1) |
257 | << preg[REG_FLASH_CTRL].shift); |
258 | if (ret < 0) |
259 | goto out; |
260 | |
261 | if (pdata->pin_strobe != LM355x_PIN_STROBE_DISABLE) { |
262 | if (chip->type == CHIP_LM3554) |
263 | reg_val = 0x00; |
264 | else |
265 | reg_val = 0x01; |
266 | ret = |
267 | regmap_update_bits(chip->regmap, |
268 | preg[REG_STROBE_CFG].regno, |
269 | preg[REG_STROBE_CFG].mask, |
270 | reg_val << |
271 | preg[REG_STROBE_CFG].shift); |
272 | if (ret < 0) |
273 | goto out; |
274 | opmode = MODE_SHDN; |
275 | dev_info(chip->dev, |
276 | "flash brt is set - ext. strobe pin mode\n"); |
277 | } |
278 | break; |
279 | |
280 | case MODE_INDIC: |
281 | ret = |
282 | regmap_update_bits(chip->regmap, preg[REG_INDI_CTRL].regno, |
283 | preg[REG_INDI_CTRL].mask, |
284 | (brightness - 1) |
285 | << preg[REG_INDI_CTRL].shift); |
286 | if (ret < 0) |
287 | goto out; |
288 | |
289 | if (pdata->pin_tx2 != LM355x_PIN_TX_DISABLE) { |
290 | ret = |
291 | regmap_update_bits(chip->regmap, |
292 | preg[REG_INDI_CFG].regno, |
293 | preg[REG_INDI_CFG].mask, |
294 | 0x01 << |
295 | preg[REG_INDI_CFG].shift); |
296 | if (ret < 0) |
297 | goto out; |
298 | opmode = MODE_SHDN; |
299 | } |
300 | break; |
301 | case MODE_SHDN: |
302 | break; |
303 | default: |
304 | return; |
305 | } |
306 | /* operation mode control */ |
307 | ret = regmap_update_bits(chip->regmap, preg[REG_OPMODE].regno, |
308 | preg[REG_OPMODE].mask, |
309 | opmode << preg[REG_OPMODE].shift); |
310 | if (ret < 0) |
311 | goto out; |
312 | return; |
313 | out: |
314 | dev_err(chip->dev, "%s:i2c access fail to register\n", __func__); |
315 | return; |
316 | } |
317 | |
318 | /* torch */ |
319 | static void lm355x_deferred_torch_brightness_set(struct work_struct *work) |
320 | { |
321 | struct lm355x_chip_data *chip = |
322 | container_of(work, struct lm355x_chip_data, work_torch); |
323 | |
324 | mutex_lock(&chip->lock); |
325 | lm355x_control(chip, chip->br_torch, MODE_TORCH); |
326 | mutex_unlock(&chip->lock); |
327 | } |
328 | |
329 | static void lm355x_torch_brightness_set(struct led_classdev *cdev, |
330 | enum led_brightness brightness) |
331 | { |
332 | struct lm355x_chip_data *chip = |
333 | container_of(cdev, struct lm355x_chip_data, cdev_torch); |
334 | |
335 | chip->br_torch = brightness; |
336 | schedule_work(&chip->work_torch); |
337 | } |
338 | |
339 | /* flash */ |
340 | static void lm355x_deferred_strobe_brightness_set(struct work_struct *work) |
341 | { |
342 | struct lm355x_chip_data *chip = |
343 | container_of(work, struct lm355x_chip_data, work_flash); |
344 | |
345 | mutex_lock(&chip->lock); |
346 | lm355x_control(chip, chip->br_flash, MODE_FLASH); |
347 | mutex_unlock(&chip->lock); |
348 | } |
349 | |
350 | static void lm355x_strobe_brightness_set(struct led_classdev *cdev, |
351 | enum led_brightness brightness) |
352 | { |
353 | struct lm355x_chip_data *chip = |
354 | container_of(cdev, struct lm355x_chip_data, cdev_flash); |
355 | |
356 | chip->br_flash = brightness; |
357 | schedule_work(&chip->work_flash); |
358 | } |
359 | |
360 | /* indicator */ |
361 | static void lm355x_deferred_indicator_brightness_set(struct work_struct *work) |
362 | { |
363 | struct lm355x_chip_data *chip = |
364 | container_of(work, struct lm355x_chip_data, work_indicator); |
365 | |
366 | mutex_lock(&chip->lock); |
367 | lm355x_control(chip, chip->br_indicator, MODE_INDIC); |
368 | mutex_unlock(&chip->lock); |
369 | } |
370 | |
371 | static void lm355x_indicator_brightness_set(struct led_classdev *cdev, |
372 | enum led_brightness brightness) |
373 | { |
374 | struct lm355x_chip_data *chip = |
375 | container_of(cdev, struct lm355x_chip_data, cdev_indicator); |
376 | |
377 | chip->br_indicator = brightness; |
378 | schedule_work(&chip->work_indicator); |
379 | } |
380 | |
381 | /* indicator pattern only for lm3556*/ |
382 | static ssize_t lm3556_indicator_pattern_store(struct device *dev, |
383 | struct device_attribute *attr, |
384 | const char *buf, size_t size) |
385 | { |
386 | ssize_t ret; |
387 | struct led_classdev *led_cdev = dev_get_drvdata(dev); |
388 | struct lm355x_chip_data *chip = |
389 | container_of(led_cdev, struct lm355x_chip_data, cdev_indicator); |
390 | unsigned int state; |
391 | |
392 | ret = kstrtouint(buf, 10, &state); |
393 | if (ret) |
394 | goto out; |
395 | if (state > INDIC_PATTERN_SIZE - 1) |
396 | state = INDIC_PATTERN_SIZE - 1; |
397 | |
398 | ret = regmap_write(chip->regmap, 0x04, |
399 | indicator_pattern[state].blinking); |
400 | if (ret < 0) |
401 | goto out; |
402 | |
403 | ret = regmap_write(chip->regmap, 0x05, |
404 | indicator_pattern[state].period_cnt); |
405 | if (ret < 0) |
406 | goto out; |
407 | |
408 | return size; |
409 | out: |
410 | dev_err(chip->dev, "%s:i2c access fail to register\n", __func__); |
411 | return ret; |
412 | } |
413 | |
414 | static DEVICE_ATTR(pattern, S_IWUSR, NULL, lm3556_indicator_pattern_store); |
415 | |
416 | static const struct regmap_config lm355x_regmap = { |
417 | .reg_bits = 8, |
418 | .val_bits = 8, |
419 | .max_register = 0xFF, |
420 | }; |
421 | |
422 | /* module initialize */ |
423 | static int lm355x_probe(struct i2c_client *client, |
424 | const struct i2c_device_id *id) |
425 | { |
426 | struct lm355x_platform_data *pdata = client->dev.platform_data; |
427 | struct lm355x_chip_data *chip; |
428 | |
429 | int err; |
430 | |
431 | if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) { |
432 | dev_err(&client->dev, "i2c functionality check fail.\n"); |
433 | return -EOPNOTSUPP; |
434 | } |
435 | |
436 | if (pdata == NULL) { |
437 | dev_err(&client->dev, "needs Platform Data.\n"); |
438 | return -ENODATA; |
439 | } |
440 | |
441 | chip = devm_kzalloc(&client->dev, |
442 | sizeof(struct lm355x_chip_data), GFP_KERNEL); |
443 | if (!chip) |
444 | return -ENOMEM; |
445 | |
446 | chip->dev = &client->dev; |
447 | chip->type = id->driver_data; |
448 | switch (id->driver_data) { |
449 | case CHIP_LM3554: |
450 | chip->regs = lm3554_regs; |
451 | break; |
452 | case CHIP_LM3556: |
453 | chip->regs = lm3556_regs; |
454 | break; |
455 | default: |
456 | return -ENOSYS; |
457 | } |
458 | chip->pdata = pdata; |
459 | |
460 | chip->regmap = devm_regmap_init_i2c(client, &lm355x_regmap); |
461 | if (IS_ERR(chip->regmap)) { |
462 | err = PTR_ERR(chip->regmap); |
463 | dev_err(&client->dev, |
464 | "Failed to allocate register map: %d\n", err); |
465 | return err; |
466 | } |
467 | |
468 | mutex_init(&chip->lock); |
469 | i2c_set_clientdata(client, chip); |
470 | |
471 | err = lm355x_chip_init(chip); |
472 | if (err < 0) |
473 | goto err_out; |
474 | |
475 | /* flash */ |
476 | INIT_WORK(&chip->work_flash, lm355x_deferred_strobe_brightness_set); |
477 | chip->cdev_flash.name = "flash"; |
478 | chip->cdev_flash.max_brightness = 16; |
479 | chip->cdev_flash.brightness_set = lm355x_strobe_brightness_set; |
480 | err = led_classdev_register((struct device *) |
481 | &client->dev, &chip->cdev_flash); |
482 | if (err < 0) |
483 | goto err_out; |
484 | /* torch */ |
485 | INIT_WORK(&chip->work_torch, lm355x_deferred_torch_brightness_set); |
486 | chip->cdev_torch.name = "torch"; |
487 | chip->cdev_torch.max_brightness = 8; |
488 | chip->cdev_torch.brightness_set = lm355x_torch_brightness_set; |
489 | err = led_classdev_register((struct device *) |
490 | &client->dev, &chip->cdev_torch); |
491 | if (err < 0) |
492 | goto err_create_torch_file; |
493 | /* indicator */ |
494 | INIT_WORK(&chip->work_indicator, |
495 | lm355x_deferred_indicator_brightness_set); |
496 | chip->cdev_indicator.name = "indicator"; |
497 | if (id->driver_data == CHIP_LM3554) |
498 | chip->cdev_indicator.max_brightness = 4; |
499 | else |
500 | chip->cdev_indicator.max_brightness = 8; |
501 | chip->cdev_indicator.brightness_set = lm355x_indicator_brightness_set; |
502 | err = led_classdev_register((struct device *) |
503 | &client->dev, &chip->cdev_indicator); |
504 | if (err < 0) |
505 | goto err_create_indicator_file; |
506 | /* indicator pattern control only for LM3554 */ |
507 | if (id->driver_data == CHIP_LM3556) { |
508 | err = |
509 | device_create_file(chip->cdev_indicator.dev, |
510 | &dev_attr_pattern); |
511 | if (err < 0) |
512 | goto err_create_pattern_file; |
513 | } |
514 | |
515 | dev_info(&client->dev, "%s is initialized\n", |
516 | lm355x_name[id->driver_data]); |
517 | return 0; |
518 | |
519 | err_create_pattern_file: |
520 | led_classdev_unregister(&chip->cdev_indicator); |
521 | err_create_indicator_file: |
522 | led_classdev_unregister(&chip->cdev_torch); |
523 | err_create_torch_file: |
524 | led_classdev_unregister(&chip->cdev_flash); |
525 | err_out: |
526 | return err; |
527 | } |
528 | |
529 | static int lm355x_remove(struct i2c_client *client) |
530 | { |
531 | struct lm355x_chip_data *chip = i2c_get_clientdata(client); |
532 | struct lm355x_reg_data *preg = chip->regs; |
533 | |
534 | regmap_write(chip->regmap, preg[REG_OPMODE].regno, 0); |
535 | if (chip->type == CHIP_LM3556) |
536 | device_remove_file(chip->cdev_indicator.dev, &dev_attr_pattern); |
537 | led_classdev_unregister(&chip->cdev_indicator); |
538 | flush_work(&chip->work_indicator); |
539 | led_classdev_unregister(&chip->cdev_torch); |
540 | flush_work(&chip->work_torch); |
541 | led_classdev_unregister(&chip->cdev_flash); |
542 | flush_work(&chip->work_flash); |
543 | dev_info(&client->dev, "%s is removed\n", lm355x_name[chip->type]); |
544 | |
545 | return 0; |
546 | } |
547 | |
548 | static const struct i2c_device_id lm355x_id[] = { |
549 | {LM3554_NAME, CHIP_LM3554}, |
550 | {LM3556_NAME, CHIP_LM3556}, |
551 | {} |
552 | }; |
553 | |
554 | MODULE_DEVICE_TABLE(i2c, lm355x_id); |
555 | |
556 | static struct i2c_driver lm355x_i2c_driver = { |
557 | .driver = { |
558 | .name = LM355x_NAME, |
559 | .owner = THIS_MODULE, |
560 | .pm = NULL, |
561 | }, |
562 | .probe = lm355x_probe, |
563 | .remove = lm355x_remove, |
564 | .id_table = lm355x_id, |
565 | }; |
566 | |
567 | module_i2c_driver(lm355x_i2c_driver); |
568 | |
569 | MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM355x"); |
570 | MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>"); |
571 | MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>"); |
572 | MODULE_LICENSE("GPL v2"); |
573 |
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jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9