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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
22enum lm355x_type {
23 CHIP_LM3554 = 0,
24 CHIP_LM3556,
25};
26
27enum 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 */
40enum lm355x_mode {
41 MODE_SHDN = 0,
42 MODE_INDIC,
43 MODE_TORCH,
44 MODE_FLASH
45};
46
47/* register map info. */
48struct lm355x_reg_data {
49 u8 regno;
50 u8 mask;
51 u8 shift;
52};
53
54struct 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 */
79enum 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
98enum 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
117enum 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
130struct indicator {
131 u8 blinking;
132 u8 period_cnt;
133};
134
135/* indicator pattern data only for lm3556 */
136static 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
143static 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
154static 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
165static char lm355x_name[][I2C_NAME_SIZE] = {
166 [CHIP_LM3554] = LM3554_NAME,
167 [CHIP_LM3556] = LM3556_NAME,
168};
169
170/* chip initialize */
171static 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;
201out:
202 dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
203 return ret;
204}
205
206/* chip control */
207static 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;
313out:
314 dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
315 return;
316}
317
318/* torch */
319static 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
329static 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 */
340static 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
350static 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 */
361static 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
371static 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*/
382static 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;
409out:
410 dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
411 return ret;
412}
413
414static DEVICE_ATTR(pattern, S_IWUSR, NULL, lm3556_indicator_pattern_store);
415
416static const struct regmap_config lm355x_regmap = {
417 .reg_bits = 8,
418 .val_bits = 8,
419 .max_register = 0xFF,
420};
421
422/* module initialize */
423static int lm355x_probe(struct i2c_client *client,
424 const struct i2c_device_id *id)
425{
426 struct lm355x_platform_data *pdata = dev_get_platdata(&client->dev);
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 chip->cdev_flash.default_trigger = "flash";
481 err = led_classdev_register((struct device *)
482 &client->dev, &chip->cdev_flash);
483 if (err < 0)
484 goto err_out;
485 /* torch */
486 INIT_WORK(&chip->work_torch, lm355x_deferred_torch_brightness_set);
487 chip->cdev_torch.name = "torch";
488 chip->cdev_torch.max_brightness = 8;
489 chip->cdev_torch.brightness_set = lm355x_torch_brightness_set;
490 chip->cdev_torch.default_trigger = "torch";
491 err = led_classdev_register((struct device *)
492 &client->dev, &chip->cdev_torch);
493 if (err < 0)
494 goto err_create_torch_file;
495 /* indicator */
496 INIT_WORK(&chip->work_indicator,
497 lm355x_deferred_indicator_brightness_set);
498 chip->cdev_indicator.name = "indicator";
499 if (id->driver_data == CHIP_LM3554)
500 chip->cdev_indicator.max_brightness = 4;
501 else
502 chip->cdev_indicator.max_brightness = 8;
503 chip->cdev_indicator.brightness_set = lm355x_indicator_brightness_set;
504 err = led_classdev_register((struct device *)
505 &client->dev, &chip->cdev_indicator);
506 if (err < 0)
507 goto err_create_indicator_file;
508 /* indicator pattern control only for LM3554 */
509 if (id->driver_data == CHIP_LM3556) {
510 err =
511 device_create_file(chip->cdev_indicator.dev,
512 &dev_attr_pattern);
513 if (err < 0)
514 goto err_create_pattern_file;
515 }
516
517 dev_info(&client->dev, "%s is initialized\n",
518 lm355x_name[id->driver_data]);
519 return 0;
520
521err_create_pattern_file:
522 led_classdev_unregister(&chip->cdev_indicator);
523err_create_indicator_file:
524 led_classdev_unregister(&chip->cdev_torch);
525err_create_torch_file:
526 led_classdev_unregister(&chip->cdev_flash);
527err_out:
528 return err;
529}
530
531static int lm355x_remove(struct i2c_client *client)
532{
533 struct lm355x_chip_data *chip = i2c_get_clientdata(client);
534 struct lm355x_reg_data *preg = chip->regs;
535
536 regmap_write(chip->regmap, preg[REG_OPMODE].regno, 0);
537 if (chip->type == CHIP_LM3556)
538 device_remove_file(chip->cdev_indicator.dev, &dev_attr_pattern);
539 led_classdev_unregister(&chip->cdev_indicator);
540 flush_work(&chip->work_indicator);
541 led_classdev_unregister(&chip->cdev_torch);
542 flush_work(&chip->work_torch);
543 led_classdev_unregister(&chip->cdev_flash);
544 flush_work(&chip->work_flash);
545 dev_info(&client->dev, "%s is removed\n", lm355x_name[chip->type]);
546
547 return 0;
548}
549
550static const struct i2c_device_id lm355x_id[] = {
551 {LM3554_NAME, CHIP_LM3554},
552 {LM3556_NAME, CHIP_LM3556},
553 {}
554};
555
556MODULE_DEVICE_TABLE(i2c, lm355x_id);
557
558static struct i2c_driver lm355x_i2c_driver = {
559 .driver = {
560 .name = LM355x_NAME,
561 .owner = THIS_MODULE,
562 .pm = NULL,
563 },
564 .probe = lm355x_probe,
565 .remove = lm355x_remove,
566 .id_table = lm355x_id,
567};
568
569module_i2c_driver(lm355x_i2c_driver);
570
571MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM355x");
572MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
573MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
574MODULE_LICENSE("GPL v2");