summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/leds/leds-lm3642.c
blob: d3dec0132769dd1d2e648a1bb69d5a78029a1461 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
/*
* Simple driver for Texas Instruments LM3642 LED Flash driver chip
* Copyright (C) 2012 Texas Instruments
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*
*/
#include <linux/module.h>
#include <linux/delay.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/slab.h>
#include <linux/platform_device.h>
#include <linux/fs.h>
#include <linux/regmap.h>
#include <linux/workqueue.h>
#include <linux/platform_data/leds-lm3642.h>

#define	REG_FILT_TIME			(0x0)
#define	REG_IVFM_MODE			(0x1)
#define	REG_TORCH_TIME			(0x6)
#define	REG_FLASH			(0x8)
#define	REG_I_CTRL			(0x9)
#define	REG_ENABLE			(0xA)
#define	REG_FLAG			(0xB)
#define	REG_MAX				(0xB)

#define	UVLO_EN_SHIFT			(7)
#define	IVM_D_TH_SHIFT			(2)
#define	TORCH_RAMP_UP_TIME_SHIFT	(3)
#define	TORCH_RAMP_DN_TIME_SHIFT	(0)
#define	INDUCTOR_I_LIMIT_SHIFT		(6)
#define	FLASH_RAMP_TIME_SHIFT		(3)
#define	FLASH_TOUT_TIME_SHIFT		(0)
#define	TORCH_I_SHIFT			(4)
#define	FLASH_I_SHIFT			(0)
#define	IVFM_SHIFT			(7)
#define	TX_PIN_EN_SHIFT			(6)
#define	STROBE_PIN_EN_SHIFT		(5)
#define	TORCH_PIN_EN_SHIFT		(4)
#define	MODE_BITS_SHIFT			(0)

#define	UVLO_EN_MASK			(0x1)
#define	IVM_D_TH_MASK			(0x7)
#define	TORCH_RAMP_UP_TIME_MASK		(0x7)
#define	TORCH_RAMP_DN_TIME_MASK		(0x7)
#define	INDUCTOR_I_LIMIT_MASK		(0x1)
#define	FLASH_RAMP_TIME_MASK		(0x7)
#define	FLASH_TOUT_TIME_MASK		(0x7)
#define	TORCH_I_MASK			(0x7)
#define	FLASH_I_MASK			(0xF)
#define	IVFM_MASK			(0x1)
#define	TX_PIN_EN_MASK			(0x1)
#define	STROBE_PIN_EN_MASK		(0x1)
#define	TORCH_PIN_EN_MASK		(0x1)
#define	MODE_BITS_MASK			(0x73)
#define EX_PIN_CONTROL_MASK		(0x71)
#define EX_PIN_ENABLE_MASK		(0x70)

enum lm3642_mode {
	MODES_STASNDBY = 0,
	MODES_INDIC,
	MODES_TORCH,
	MODES_FLASH
};

struct lm3642_chip_data {
	struct device *dev;

	struct led_classdev cdev_flash;
	struct led_classdev cdev_torch;
	struct led_classdev cdev_indicator;

	struct work_struct work_flash;
	struct work_struct work_torch;
	struct work_struct work_indicator;

	u8 br_flash;
	u8 br_torch;
	u8 br_indicator;

	enum lm3642_torch_pin_enable torch_pin;
	enum lm3642_strobe_pin_enable strobe_pin;
	enum lm3642_tx_pin_enable tx_pin;

	struct lm3642_platform_data *pdata;
	struct regmap *regmap;
	struct mutex lock;

	unsigned int last_flag;
};

/* chip initialize */
static int lm3642_chip_init(struct lm3642_chip_data *chip)
{
	int ret;
	struct lm3642_platform_data *pdata = chip->pdata;

	/* set enable register */
	ret = regmap_update_bits(chip->regmap, REG_ENABLE, EX_PIN_ENABLE_MASK,
				 pdata->tx_pin);
	if (ret < 0)
		dev_err(chip->dev, "Failed to update REG_ENABLE Register\n");
	return ret;
}

/* chip control */
static int lm3642_control(struct lm3642_chip_data *chip,
			  u8 brightness, enum lm3642_mode opmode)
{
	int ret;

	ret = regmap_read(chip->regmap, REG_FLAG, &chip->last_flag);
	if (ret < 0) {
		dev_err(chip->dev, "Failed to read REG_FLAG Register\n");
		goto out;
	}

	if (chip->last_flag)
		dev_info(chip->dev, "Last FLAG is 0x%x\n", chip->last_flag);

	/* brightness 0 means off-state */
	if (!brightness)
		opmode = MODES_STASNDBY;

	switch (opmode) {
	case MODES_TORCH:
		ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
					 TORCH_I_MASK << TORCH_I_SHIFT,
					 (brightness - 1) << TORCH_I_SHIFT);

		if (chip->torch_pin)
			opmode |= (TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT);
		break;

	case MODES_FLASH:
		ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
					 FLASH_I_MASK << FLASH_I_SHIFT,
					 (brightness - 1) << FLASH_I_SHIFT);

		if (chip->strobe_pin)
			opmode |= (STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT);
		break;

	case MODES_INDIC:
		ret = regmap_update_bits(chip->regmap, REG_I_CTRL,
					 TORCH_I_MASK << TORCH_I_SHIFT,
					 (brightness - 1) << TORCH_I_SHIFT);
		break;

	case MODES_STASNDBY:

		break;

	default:
		return ret;
	}
	if (ret < 0) {
		dev_err(chip->dev, "Failed to write REG_I_CTRL Register\n");
		goto out;
	}

	if (chip->tx_pin)
		opmode |= (TX_PIN_EN_MASK << TX_PIN_EN_SHIFT);

	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
				 MODE_BITS_MASK << MODE_BITS_SHIFT,
				 opmode << MODE_BITS_SHIFT);
out:
	return ret;
}

/* torch */

/* torch pin config for lm3642*/
static ssize_t lm3642_torch_pin_store(struct device *dev,
				      struct device_attribute *attr,
				      const char *buf, size_t size)
{
	ssize_t ret;
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3642_chip_data *chip =
	    container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
	unsigned int state;

	ret = kstrtouint(buf, 10, &state);
	if (ret)
		goto out_strtoint;
	if (state != 0)
		state = 0x01 << TORCH_PIN_EN_SHIFT;

	chip->torch_pin = state;
	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
				 TORCH_PIN_EN_MASK << TORCH_PIN_EN_SHIFT,
				 state);
	if (ret < 0)
		goto out;

	return size;
out:
	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
	return ret;
out_strtoint:
	dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
	return ret;
}

static DEVICE_ATTR(torch_pin, S_IWUSR, NULL, lm3642_torch_pin_store);

static void lm3642_deferred_torch_brightness_set(struct work_struct *work)
{
	struct lm3642_chip_data *chip =
	    container_of(work, struct lm3642_chip_data, work_torch);

	mutex_lock(&chip->lock);
	lm3642_control(chip, chip->br_torch, MODES_TORCH);
	mutex_unlock(&chip->lock);
}

static void lm3642_torch_brightness_set(struct led_classdev *cdev,
					enum led_brightness brightness)
{
	struct lm3642_chip_data *chip =
	    container_of(cdev, struct lm3642_chip_data, cdev_torch);

	chip->br_torch = brightness;
	schedule_work(&chip->work_torch);
}

/* flash */

/* strobe pin config for lm3642*/
static ssize_t lm3642_strobe_pin_store(struct device *dev,
				       struct device_attribute *attr,
				       const char *buf, size_t size)
{
	ssize_t ret;
	struct led_classdev *led_cdev = dev_get_drvdata(dev);
	struct lm3642_chip_data *chip =
	    container_of(led_cdev, struct lm3642_chip_data, cdev_indicator);
	unsigned int state;

	ret = kstrtouint(buf, 10, &state);
	if (ret)
		goto out_strtoint;
	if (state != 0)
		state = 0x01 << STROBE_PIN_EN_SHIFT;

	chip->strobe_pin = state;
	ret = regmap_update_bits(chip->regmap, REG_ENABLE,
				 STROBE_PIN_EN_MASK << STROBE_PIN_EN_SHIFT,
				 state);
	if (ret < 0)
		goto out;

	return size;
out:
	dev_err(chip->dev, "%s:i2c access fail to register\n", __func__);
	return ret;
out_strtoint:
	dev_err(chip->dev, "%s: fail to change str to int\n", __func__);
	return ret;
}

static DEVICE_ATTR(strobe_pin, S_IWUSR, NULL, lm3642_strobe_pin_store);

static void lm3642_deferred_strobe_brightness_set(struct work_struct *work)
{
	struct lm3642_chip_data *chip =
	    container_of(work, struct lm3642_chip_data, work_flash);

	mutex_lock(&chip->lock);
	lm3642_control(chip, chip->br_flash, MODES_FLASH);
	mutex_unlock(&chip->lock);
}

static void lm3642_strobe_brightness_set(struct led_classdev *cdev,
					 enum led_brightness brightness)
{
	struct lm3642_chip_data *chip =
	    container_of(cdev, struct lm3642_chip_data, cdev_flash);

	chip->br_flash = brightness;
	schedule_work(&chip->work_flash);
}

/* indicator */
static void lm3642_deferred_indicator_brightness_set(struct work_struct *work)
{
	struct lm3642_chip_data *chip =
	    container_of(work, struct lm3642_chip_data, work_indicator);

	mutex_lock(&chip->lock);
	lm3642_control(chip, chip->br_indicator, MODES_INDIC);
	mutex_unlock(&chip->lock);
}

static void lm3642_indicator_brightness_set(struct led_classdev *cdev,
					    enum led_brightness brightness)
{
	struct lm3642_chip_data *chip =
	    container_of(cdev, struct lm3642_chip_data, cdev_indicator);

	chip->br_indicator = brightness;
	schedule_work(&chip->work_indicator);
}

static const struct regmap_config lm3642_regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = REG_MAX,
};

static struct attribute *lm3642_flash_attrs[] = {
	&dev_attr_strobe_pin.attr,
	NULL
};
ATTRIBUTE_GROUPS(lm3642_flash);

static struct attribute *lm3642_torch_attrs[] = {
	&dev_attr_torch_pin.attr,
	NULL
};
ATTRIBUTE_GROUPS(lm3642_torch);

static int lm3642_probe(struct i2c_client *client,
				  const struct i2c_device_id *id)
{
	struct lm3642_platform_data *pdata = dev_get_platdata(&client->dev);
	struct lm3642_chip_data *chip;

	int err;

	if (!i2c_check_functionality(client->adapter, I2C_FUNC_I2C)) {
		dev_err(&client->dev, "i2c functionality check fail.\n");
		return -EOPNOTSUPP;
	}

	if (pdata == NULL) {
		dev_err(&client->dev, "needs Platform Data.\n");
		return -ENODATA;
	}

	chip = devm_kzalloc(&client->dev,
			    sizeof(struct lm3642_chip_data), GFP_KERNEL);
	if (!chip)
		return -ENOMEM;

	chip->dev = &client->dev;
	chip->pdata = pdata;

	chip->tx_pin = pdata->tx_pin;
	chip->torch_pin = pdata->torch_pin;
	chip->strobe_pin = pdata->strobe_pin;

	chip->regmap = devm_regmap_init_i2c(client, &lm3642_regmap);
	if (IS_ERR(chip->regmap)) {
		err = PTR_ERR(chip->regmap);
		dev_err(&client->dev, "Failed to allocate register map: %d\n",
			err);
		return err;
	}

	mutex_init(&chip->lock);
	i2c_set_clientdata(client, chip);

	err = lm3642_chip_init(chip);
	if (err < 0)
		goto err_out;

	/* flash */
	INIT_WORK(&chip->work_flash, lm3642_deferred_strobe_brightness_set);
	chip->cdev_flash.name = "flash";
	chip->cdev_flash.max_brightness = 16;
	chip->cdev_flash.brightness_set = lm3642_strobe_brightness_set;
	chip->cdev_flash.default_trigger = "flash";
	chip->cdev_flash.groups = lm3642_flash_groups,
	err = led_classdev_register((struct device *)
				    &client->dev, &chip->cdev_flash);
	if (err < 0) {
		dev_err(chip->dev, "failed to register flash\n");
		goto err_out;
	}

	/* torch */
	INIT_WORK(&chip->work_torch, lm3642_deferred_torch_brightness_set);
	chip->cdev_torch.name = "torch";
	chip->cdev_torch.max_brightness = 8;
	chip->cdev_torch.brightness_set = lm3642_torch_brightness_set;
	chip->cdev_torch.default_trigger = "torch";
	chip->cdev_torch.groups = lm3642_torch_groups,
	err = led_classdev_register((struct device *)
				    &client->dev, &chip->cdev_torch);
	if (err < 0) {
		dev_err(chip->dev, "failed to register torch\n");
		goto err_create_torch_file;
	}

	/* indicator */
	INIT_WORK(&chip->work_indicator,
		  lm3642_deferred_indicator_brightness_set);
	chip->cdev_indicator.name = "indicator";
	chip->cdev_indicator.max_brightness = 8;
	chip->cdev_indicator.brightness_set = lm3642_indicator_brightness_set;
	err = led_classdev_register((struct device *)
				    &client->dev, &chip->cdev_indicator);
	if (err < 0) {
		dev_err(chip->dev, "failed to register indicator\n");
		goto err_create_indicator_file;
	}

	dev_info(&client->dev, "LM3642 is initialized\n");
	return 0;

err_create_indicator_file:
	led_classdev_unregister(&chip->cdev_torch);
err_create_torch_file:
	led_classdev_unregister(&chip->cdev_flash);
err_out:
	return err;
}

static int lm3642_remove(struct i2c_client *client)
{
	struct lm3642_chip_data *chip = i2c_get_clientdata(client);

	led_classdev_unregister(&chip->cdev_indicator);
	flush_work(&chip->work_indicator);
	led_classdev_unregister(&chip->cdev_torch);
	flush_work(&chip->work_torch);
	led_classdev_unregister(&chip->cdev_flash);
	flush_work(&chip->work_flash);
	regmap_write(chip->regmap, REG_ENABLE, 0);
	return 0;
}

static const struct i2c_device_id lm3642_id[] = {
	{LM3642_NAME, 0},
	{}
};

MODULE_DEVICE_TABLE(i2c, lm3642_id);

static struct i2c_driver lm3642_i2c_driver = {
	.driver = {
		   .name = LM3642_NAME,
		   .owner = THIS_MODULE,
		   .pm = NULL,
		   },
	.probe = lm3642_probe,
	.remove = lm3642_remove,
	.id_table = lm3642_id,
};

module_i2c_driver(lm3642_i2c_driver);

MODULE_DESCRIPTION("Texas Instruments Flash Lighting driver for LM3642");
MODULE_AUTHOR("Daniel Jeong <daniel.jeong@ti.com>");
MODULE_AUTHOR("G.Shark Jeong <gshark.jeong@gmail.com>");
MODULE_LICENSE("GPL v2");