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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/platform_data/leds-lm355x.h>
20
21enum lm355x_type {
22 CHIP_LM3554 = 0,
23 CHIP_LM3556,
24};
25
26enum lm355x_regs {
27 REG_FLAG = 0,
28 REG_TORCH_CFG,
29 REG_TORCH_CTRL,
30 REG_STROBE_CFG,
31 REG_FLASH_CTRL,
32 REG_INDI_CFG,
33 REG_INDI_CTRL,
34 REG_OPMODE,
35 REG_MAX,
36};
37
38/* operation mode */
39enum lm355x_mode {
40 MODE_SHDN = 0,
41 MODE_INDIC,
42 MODE_TORCH,
43 MODE_FLASH
44};
45
46/* register map info. */
47struct lm355x_reg_data {
48 u8 regno;
49 u8 mask;
50 u8 shift;
51};
52
53struct lm355x_chip_data {
54 struct device *dev;
55 enum lm355x_type type;
56
57 struct led_classdev cdev_flash;
58 struct led_classdev cdev_torch;
59 struct led_classdev cdev_indicator;
60
61 struct lm355x_platform_data *pdata;
62 struct regmap *regmap;
63 struct mutex lock;
64
65 unsigned int last_flag;
66 struct lm355x_reg_data *regs;
67};
68
69/* specific indicator function for lm3556 */
70enum lm3556_indic_pulse_time {
71 PULSE_TIME_0_MS = 0,
72 PULSE_TIME_32_MS,
73 PULSE_TIME_64_MS,
74 PULSE_TIME_92_MS,
75 PULSE_TIME_128_MS,
76 PULSE_TIME_160_MS,
77 PULSE_TIME_196_MS,
78 PULSE_TIME_224_MS,
79 PULSE_TIME_256_MS,
80 PULSE_TIME_288_MS,
81 PULSE_TIME_320_MS,
82 PULSE_TIME_352_MS,
83 PULSE_TIME_384_MS,
84 PULSE_TIME_416_MS,
85 PULSE_TIME_448_MS,
86 PULSE_TIME_480_MS,
87};
88
89enum lm3556_indic_n_blank {
90 INDIC_N_BLANK_0 = 0,
91 INDIC_N_BLANK_1,
92 INDIC_N_BLANK_2,
93 INDIC_N_BLANK_3,
94 INDIC_N_BLANK_4,
95 INDIC_N_BLANK_5,
96 INDIC_N_BLANK_6,
97 INDIC_N_BLANK_7,
98 INDIC_N_BLANK_8,
99 INDIC_N_BLANK_9,
100 INDIC_N_BLANK_10,
101 INDIC_N_BLANK_11,
102 INDIC_N_BLANK_12,
103 INDIC_N_BLANK_13,
104 INDIC_N_BLANK_14,
105 INDIC_N_BLANK_15,
106};
107
108enum lm3556_indic_period {
109 INDIC_PERIOD_0 = 0,
110 INDIC_PERIOD_1,
111 INDIC_PERIOD_2,
112 INDIC_PERIOD_3,
113 INDIC_PERIOD_4,
114 INDIC_PERIOD_5,
115 INDIC_PERIOD_6,
116 INDIC_PERIOD_7,
117};
118
119#define INDIC_PATTERN_SIZE 4
120
121struct indicator {
122 u8 blinking;
123 u8 period_cnt;
124};
125
126/* indicator pattern data only for lm3556 */
127static struct indicator indicator_pattern[INDIC_PATTERN_SIZE] = {
128 [0] = {(INDIC_N_BLANK_1 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_1},
129 [1] = {(INDIC_N_BLANK_15 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_2},
130 [2] = {(INDIC_N_BLANK_10 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_4},
131 [3] = {(INDIC_N_BLANK_5 << 4) | PULSE_TIME_32_MS, INDIC_PERIOD_7},
132};
133
134static struct lm355x_reg_data lm3554_regs[REG_MAX] = {
135 [REG_FLAG] = {0xD0, 0xBF, 0},
136 [REG_TORCH_CFG] = {0xE0, 0x80, 7},
137 [REG_TORCH_CTRL] = {0xA0, 0x38, 3},
138 [REG_STROBE_CFG] = {0xE0, 0x04, 2},
139 [REG_FLASH_CTRL] = {0xB0, 0x78, 3},
140 [REG_INDI_CFG] = {0xE0, 0x08, 3},
141 [REG_INDI_CTRL] = {0xA0, 0xC0, 6},
142 [REG_OPMODE] = {0xA0, 0x03, 0},
143};
144
145static struct lm355x_reg_data lm3556_regs[REG_MAX] = {
146 [REG_FLAG] = {0x0B, 0xFF, 0},
147 [REG_TORCH_CFG] = {0x0A, 0x10, 4},
148 [REG_TORCH_CTRL] = {0x09, 0x70, 4},
149 [REG_STROBE_CFG] = {0x0A, 0x20, 5},
150 [REG_FLASH_CTRL] = {0x09, 0x0F, 0},
151 [REG_INDI_CFG] = {0xFF, 0xFF, 0},
152 [REG_INDI_CTRL] = {0x09, 0x70, 4},
153 [REG_OPMODE] = {0x0A, 0x03, 0},
154};
155
156static char lm355x_name[][I2C_NAME_SIZE] = {
157 [CHIP_LM3554] = LM3554_NAME,
158 [CHIP_LM3556] = LM3556_NAME,
159};
160
161/* chip initialize */
162static int lm355x_chip_init(struct lm355x_chip_data *chip)
163{
164 int ret;
165 unsigned int reg_val;
166 struct lm355x_platform_data *pdata = chip->pdata;
167
168 /* input and output pins configuration */
169 switch (chip->type) {
170 case CHIP_LM3554:
171 reg_val = pdata->pin_tx2 | pdata->ntc_pin;
172 ret = regmap_update_bits(chip->regmap, 0xE0, 0x28, reg_val);
173 if (ret < 0)
174 goto out;
175 reg_val = pdata->pass_mode;
176 ret = regmap_update_bits(chip->regmap, 0xA0, 0x04, reg_val);
177 if (ret < 0)
178 goto out;
179 break;
180
181 case CHIP_LM3556:
182 reg_val = pdata->pin_tx2 | pdata->ntc_pin | pdata->pass_mode;
183 ret = regmap_update_bits(chip->regmap, 0x0A, 0xC4, reg_val);
184 if (ret < 0)
185 goto out;
186 break;
187 default:
188 return -ENODATA;
189 }
190
191 return ret;
192out:
193 dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
194 return ret;
195}
196
197/* chip control */
198static int lm355x_control(struct lm355x_chip_data *chip,
199 u8 brightness, enum lm355x_mode opmode)
200{
201 int ret;
202 unsigned int reg_val;
203 struct lm355x_platform_data *pdata = chip->pdata;
204 struct lm355x_reg_data *preg = chip->regs;
205
206 ret = regmap_read(chip->regmap, preg[REG_FLAG].regno, &chip->last_flag);
207 if (ret < 0)
208 goto out;
209 if (chip->last_flag & preg[REG_FLAG].mask)
210 dev_info(chip->dev, "%s Last FLAG is 0x%x\n",
211 lm355x_name[chip->type],
212 chip->last_flag & preg[REG_FLAG].mask);
213 /* brightness 0 means shutdown */
214 if (!brightness)
215 opmode = MODE_SHDN;
216
217 switch (opmode) {
218 case MODE_TORCH:
219 ret =
220 regmap_update_bits(chip->regmap, preg[REG_TORCH_CTRL].regno,
221 preg[REG_TORCH_CTRL].mask,
222 (brightness - 1)
223 << preg[REG_TORCH_CTRL].shift);
224 if (ret < 0)
225 goto out;
226
227 if (pdata->pin_tx1 != LM355x_PIN_TORCH_DISABLE) {
228 ret =
229 regmap_update_bits(chip->regmap,
230 preg[REG_TORCH_CFG].regno,
231 preg[REG_TORCH_CFG].mask,
232 0x01 <<
233 preg[REG_TORCH_CFG].shift);
234 if (ret < 0)
235 goto out;
236 opmode = MODE_SHDN;
237 dev_info(chip->dev,
238 "torch brt is set - ext. torch pin mode\n");
239 }
240 break;
241
242 case MODE_FLASH:
243
244 ret =
245 regmap_update_bits(chip->regmap, preg[REG_FLASH_CTRL].regno,
246 preg[REG_FLASH_CTRL].mask,
247 (brightness - 1)
248 << preg[REG_FLASH_CTRL].shift);
249 if (ret < 0)
250 goto out;
251
252 if (pdata->pin_strobe != LM355x_PIN_STROBE_DISABLE) {
253 if (chip->type == CHIP_LM3554)
254 reg_val = 0x00;
255 else
256 reg_val = 0x01;
257 ret =
258 regmap_update_bits(chip->regmap,
259 preg[REG_STROBE_CFG].regno,
260 preg[REG_STROBE_CFG].mask,
261 reg_val <<
262 preg[REG_STROBE_CFG].shift);
263 if (ret < 0)
264 goto out;
265 opmode = MODE_SHDN;
266 dev_info(chip->dev,
267 "flash brt is set - ext. strobe pin mode\n");
268 }
269 break;
270
271 case MODE_INDIC:
272 ret =
273 regmap_update_bits(chip->regmap, preg[REG_INDI_CTRL].regno,
274 preg[REG_INDI_CTRL].mask,
275 (brightness - 1)
276 << preg[REG_INDI_CTRL].shift);
277 if (ret < 0)
278 goto out;
279
280 if (pdata->pin_tx2 != LM355x_PIN_TX_DISABLE) {
281 ret =
282 regmap_update_bits(chip->regmap,
283 preg[REG_INDI_CFG].regno,
284 preg[REG_INDI_CFG].mask,
285 0x01 <<
286 preg[REG_INDI_CFG].shift);
287 if (ret < 0)
288 goto out;
289 opmode = MODE_SHDN;
290 }
291 break;
292 case MODE_SHDN:
293 break;
294 default:
295 return -EINVAL;
296 }
297 /* operation mode control */
298 ret = regmap_update_bits(chip->regmap, preg[REG_OPMODE].regno,
299 preg[REG_OPMODE].mask,
300 opmode << preg[REG_OPMODE].shift);
301 if (ret < 0)
302 goto out;
303 return ret;
304out:
305 dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
306 return ret;
307}
308
309/* torch */
310
311static int lm355x_torch_brightness_set(struct led_classdev *cdev,
312 enum led_brightness brightness)
313{
314 struct lm355x_chip_data *chip =
315 container_of(cdev, struct lm355x_chip_data, cdev_torch);
316 int ret;
317
318 mutex_lock(&chip->lock);
319 ret = lm355x_control(chip, brightness, MODE_TORCH);
320 mutex_unlock(&chip->lock);
321 return ret;
322}
323
324/* flash */
325
326static int lm355x_strobe_brightness_set(struct led_classdev *cdev,
327 enum led_brightness brightness)
328{
329 struct lm355x_chip_data *chip =
330 container_of(cdev, struct lm355x_chip_data, cdev_flash);
331 int ret;
332
333 mutex_lock(&chip->lock);
334 ret = lm355x_control(chip, brightness, MODE_FLASH);
335 mutex_unlock(&chip->lock);
336 return ret;
337}
338
339/* indicator */
340
341static int lm355x_indicator_brightness_set(struct led_classdev *cdev,
342 enum led_brightness brightness)
343{
344 struct lm355x_chip_data *chip =
345 container_of(cdev, struct lm355x_chip_data, cdev_indicator);
346 int ret;
347
348 mutex_lock(&chip->lock);
349 ret = lm355x_control(chip, brightness, MODE_INDIC);
350 mutex_unlock(&chip->lock);
351 return ret;
352}
353
354/* indicator pattern only for lm3556*/
355static ssize_t lm3556_indicator_pattern_store(struct device *dev,
356 struct device_attribute *attr,
357 const char *buf, size_t size)
358{
359 ssize_t ret;
360 struct led_classdev *led_cdev = dev_get_drvdata(dev);
361 struct lm355x_chip_data *chip =
362 container_of(led_cdev, struct lm355x_chip_data, cdev_indicator);
363 unsigned int state;
364
365 ret = kstrtouint(buf, 10, &state);
366 if (ret)
367 goto out;
368 if (state > INDIC_PATTERN_SIZE - 1)
369 state = INDIC_PATTERN_SIZE - 1;
370
371 ret = regmap_write(chip->regmap, 0x04,
372 indicator_pattern[state].blinking);
373 if (ret < 0)
374 goto out;
375
376 ret = regmap_write(chip->regmap, 0x05,
377 indicator_pattern[state].period_cnt);
378 if (ret < 0)
379 goto out;
380
381 return size;
382out:
383 dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
384 return ret;
385}
386
387static DEVICE_ATTR(pattern, S_IWUSR, NULL, lm3556_indicator_pattern_store);
388
389static struct attribute *lm355x_indicator_attrs[] = {
390 &dev_attr_pattern.attr,
391 NULL
392};
393ATTRIBUTE_GROUPS(lm355x_indicator);
394
395static const struct regmap_config lm355x_regmap = {
396 .reg_bits = 8,
397 .val_bits = 8,
398 .max_register = 0xFF,
399};
400
401/* module initialize */
402static int lm355x_probe(struct i2c_client *client,
403 const struct i2c_device_id *id)
404{
405 struct lm355x_platform_data *pdata = dev_get_platdata(&client->dev);
406 struct lm355x_chip_data *chip;
407
408 int err;
409
410 if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
411 dev_err(&client->dev, "i2c functionality check fail.\n");
412 return -EOPNOTSUPP;
413 }
414
415 if (pdata == NULL) {
416 dev_err(&client->dev, "needs Platform Data.\n");
417 return -ENODATA;
418 }
419
420 chip = devm_kzalloc(&client->dev,
421 sizeof(struct lm355x_chip_data), GFP_KERNEL);
422 if (!chip)
423 return -ENOMEM;
424
425 chip->dev = &client->dev;
426 chip->type = id->driver_data;
427 switch (id->driver_data) {
428 case CHIP_LM3554:
429 chip->regs = lm3554_regs;
430 break;
431 case CHIP_LM3556:
432 chip->regs = lm3556_regs;
433 break;
434 default:
435 return -ENOSYS;
436 }
437 chip->pdata = pdata;
438
439 chip->regmap = devm_regmap_init_i2c(client, &lm355x_regmap);
440 if (IS_ERR(chip->regmap)) {
441 err = PTR_ERR(chip->regmap);
442 dev_err(&client->dev,
443 "Failed to allocate register map: %d\n", err);
444 return err;
445 }
446
447 mutex_init(&chip->lock);
448 i2c_set_clientdata(client, chip);
449
450 err = lm355x_chip_init(chip);
451 if (err < 0)
452 goto err_out;
453
454 /* flash */
455 chip->cdev_flash.name = "flash";
456 chip->cdev_flash.max_brightness = 16;
457 chip->cdev_flash.brightness_set_blocking = lm355x_strobe_brightness_set;
458 chip->cdev_flash.default_trigger = "flash";
459 err = led_classdev_register((struct device *)
460 &client->dev, &chip->cdev_flash);
461 if (err < 0)
462 goto err_out;
463 /* torch */
464 chip->cdev_torch.name = "torch";
465 chip->cdev_torch.max_brightness = 8;
466 chip->cdev_torch.brightness_set_blocking = lm355x_torch_brightness_set;
467 chip->cdev_torch.default_trigger = "torch";
468 err = led_classdev_register((struct device *)
469 &client->dev, &chip->cdev_torch);
470 if (err < 0)
471 goto err_create_torch_file;
472 /* indicator */
473 chip->cdev_indicator.name = "indicator";
474 if (id->driver_data == CHIP_LM3554)
475 chip->cdev_indicator.max_brightness = 4;
476 else
477 chip->cdev_indicator.max_brightness = 8;
478 chip->cdev_indicator.brightness_set_blocking =
479 lm355x_indicator_brightness_set;
480 /* indicator pattern control only for LM3556 */
481 if (id->driver_data == CHIP_LM3556)
482 chip->cdev_indicator.groups = lm355x_indicator_groups;
483 err = led_classdev_register((struct device *)
484 &client->dev, &chip->cdev_indicator);
485 if (err < 0)
486 goto err_create_indicator_file;
487
488 dev_info(&client->dev, "%s is initialized\n",
489 lm355x_name[id->driver_data]);
490 return 0;
491
492err_create_indicator_file:
493 led_classdev_unregister(&chip->cdev_torch);
494err_create_torch_file:
495 led_classdev_unregister(&chip->cdev_flash);
496err_out:
497 return err;
498}
499
500static int lm355x_remove(struct i2c_client *client)
501{
502 struct lm355x_chip_data *chip = i2c_get_clientdata(client);
503 struct lm355x_reg_data *preg = chip->regs;
504
505 regmap_write(chip->regmap, preg[REG_OPMODE].regno, 0);
506 led_classdev_unregister(&chip->cdev_indicator);
507 led_classdev_unregister(&chip->cdev_torch);
508 led_classdev_unregister(&chip->cdev_flash);
509 dev_info(&client->dev, "%s is removed\n", lm355x_name[chip->type]);
510
511 return 0;
512}
513
514static const struct i2c_device_id lm355x_id[] = {
515 {LM3554_NAME, CHIP_LM3554},
516 {LM3556_NAME, CHIP_LM3556},
517 {}
518};
519
520MODULE_DEVICE_TABLE(i2c, lm355x_id);
521
522static struct i2c_driver lm355x_i2c_driver = {
523 .driver = {
524 .name = LM355x_NAME,
525 .pm = NULL,
526 },
527 .probe = lm355x_probe,
528 .remove = lm355x_remove,
529 .id_table = lm355x_id,
530};
531
532module_i2c_driver(lm355x_i2c_driver);
533
534MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM355x");
535MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
536MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
537MODULE_LICENSE("GPL v2");