summaryrefslogtreecommitdiffstats
path: root/drivers/video/backlight/lm3639_bl.c
blob: 086611c7bc03cf3505bbe7e041dc6419841f30f9 (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
/*
* Simple driver for Texas Instruments LM3639 Backlight + Flash LED 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/slab.h>
#include <linux/i2c.h>
#include <linux/leds.h>
#include <linux/backlight.h>
#include <linux/err.h>
#include <linux/delay.h>
#include <linux/uaccess.h>
#include <linux/interrupt.h>
#include <linux/regmap.h>
#include <linux/platform_data/lm3639_bl.h>

#define REG_DEV_ID	0x00
#define REG_CHECKSUM	0x01
#define REG_BL_CONF_1	0x02
#define REG_BL_CONF_2	0x03
#define REG_BL_CONF_3	0x04
#define REG_BL_CONF_4	0x05
#define REG_FL_CONF_1	0x06
#define REG_FL_CONF_2	0x07
#define REG_FL_CONF_3	0x08
#define REG_IO_CTRL	0x09
#define REG_ENABLE	0x0A
#define REG_FLAG	0x0B
#define REG_MAX		REG_FLAG

struct lm3639_chip_data {
	struct device *dev;
	struct lm3639_platform_data *pdata;

	struct backlight_device *bled;
	struct led_classdev cdev_flash;
	struct led_classdev cdev_torch;
	struct regmap *regmap;

	unsigned int bled_mode;
	unsigned int bled_map;
	unsigned int last_flag;
};

/* initialize chip */
static int lm3639_chip_init(struct lm3639_chip_data *pchip)
{
	int ret;
	unsigned int reg_val;
	struct lm3639_platform_data *pdata = pchip->pdata;

	/* input pins config. */
	ret =
	    regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x08,
			       pdata->pin_pwm);
	if (ret < 0)
		goto out;

	reg_val = (pdata->pin_pwm & 0x40) | pdata->pin_strobe | pdata->pin_tx;
	ret = regmap_update_bits(pchip->regmap, REG_IO_CTRL, 0x7C, reg_val);
	if (ret < 0)
		goto out;

	/* init brightness */
	ret = regmap_write(pchip->regmap, REG_BL_CONF_4, pdata->init_brt_led);
	if (ret < 0)
		goto out;

	ret = regmap_write(pchip->regmap, REG_BL_CONF_3, pdata->init_brt_led);
	if (ret < 0)
		goto out;

	/* output pins config. */
	if (!pdata->init_brt_led) {
		reg_val = pdata->fled_pins;
		reg_val |= pdata->bled_pins;
	} else {
		reg_val = pdata->fled_pins;
		reg_val |= pdata->bled_pins | 0x01;
	}

	ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x79, reg_val);
	if (ret < 0)
		goto out;

	return ret;
out:
	dev_err(pchip->dev, "i2c failed to access register\n");
	return ret;
}

/* update and get brightness */
static int lm3639_bled_update_status(struct backlight_device *bl)
{
	int ret;
	unsigned int reg_val;
	struct lm3639_chip_data *pchip = bl_get_data(bl);
	struct lm3639_platform_data *pdata = pchip->pdata;

	ret = regmap_read(pchip->regmap, REG_FLAG, &reg_val);
	if (ret < 0)
		goto out;

	if (reg_val != 0)
		dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);

	/* pwm control */
	if (pdata->pin_pwm) {
		if (pdata->pwm_set_intensity)
			pdata->pwm_set_intensity(bl->props.brightness,
						 pdata->max_brt_led);
		else
			dev_err(pchip->dev,
				"No pwm control func. in plat-data\n");
		return bl->props.brightness;
	}

	/* i2c control and set brigtness */
	ret = regmap_write(pchip->regmap, REG_BL_CONF_4, bl->props.brightness);
	if (ret < 0)
		goto out;
	ret = regmap_write(pchip->regmap, REG_BL_CONF_3, bl->props.brightness);
	if (ret < 0)
		goto out;

	if (!bl->props.brightness)
		ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x00);
	else
		ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x01, 0x01);
	if (ret < 0)
		goto out;

	return bl->props.brightness;
out:
	dev_err(pchip->dev, "i2c failed to access registers\n");
	return bl->props.brightness;
}

static int lm3639_bled_get_brightness(struct backlight_device *bl)
{
	int ret;
	unsigned int reg_val;
	struct lm3639_chip_data *pchip = bl_get_data(bl);
	struct lm3639_platform_data *pdata = pchip->pdata;

	if (pdata->pin_pwm) {
		if (pdata->pwm_get_intensity)
			bl->props.brightness = pdata->pwm_get_intensity();
		else
			dev_err(pchip->dev,
				"No pwm control func. in plat-data\n");
		return bl->props.brightness;
	}

	ret = regmap_read(pchip->regmap, REG_BL_CONF_1, &reg_val);
	if (ret < 0)
		goto out;
	if (reg_val & 0x10)
		ret = regmap_read(pchip->regmap, REG_BL_CONF_4, &reg_val);
	else
		ret = regmap_read(pchip->regmap, REG_BL_CONF_3, &reg_val);
	if (ret < 0)
		goto out;
	bl->props.brightness = reg_val;

	return bl->props.brightness;
out:
	dev_err(pchip->dev, "i2c failed to access register\n");
	return bl->props.brightness;
}

static const struct backlight_ops lm3639_bled_ops = {
	.options = BL_CORE_SUSPENDRESUME,
	.update_status = lm3639_bled_update_status,
	.get_brightness = lm3639_bled_get_brightness,
};

/* backlight mapping mode */
static ssize_t lm3639_bled_mode_store(struct device *dev,
				      struct device_attribute *devAttr,
				      const char *buf, size_t size)
{
	ssize_t ret;
	struct lm3639_chip_data *pchip = dev_get_drvdata(dev);
	unsigned int state;

	ret = kstrtouint(buf, 10, &state);
	if (ret)
		goto out_input;

	if (!state)
		ret =
		    regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10,
				       0x00);
	else
		ret =
		    regmap_update_bits(pchip->regmap, REG_BL_CONF_1, 0x10,
				       0x10);

	if (ret < 0)
		goto out;

	return size;

out:
	dev_err(pchip->dev, "%s:i2c access fail to register\n", __func__);
	return ret;

out_input:
	dev_err(pchip->dev, "%s:input conversion fail\n", __func__);
	return ret;

}

static DEVICE_ATTR(bled_mode, S_IWUSR, NULL, lm3639_bled_mode_store);

/* torch */
static void lm3639_torch_brightness_set(struct led_classdev *cdev,
					enum led_brightness brightness)
{
	int ret;
	unsigned int reg_val;
	struct lm3639_chip_data *pchip;

	pchip = container_of(cdev, struct lm3639_chip_data, cdev_torch);

	ret = regmap_read(pchip->regmap, REG_FLAG, &reg_val);
	if (ret < 0)
		goto out;
	if (reg_val != 0)
		dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);

	/* brightness 0 means off state */
	if (!brightness) {
		ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00);
		if (ret < 0)
			goto out;
		return;
	}

	ret = regmap_update_bits(pchip->regmap,
				 REG_FL_CONF_1, 0x70, (brightness - 1) << 4);
	if (ret < 0)
		goto out;
	ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x02);
	if (ret < 0)
		goto out;

	return;
out:
	dev_err(pchip->dev, "i2c failed to access register\n");
}

/* flash */
static void lm3639_flash_brightness_set(struct led_classdev *cdev,
					enum led_brightness brightness)
{
	int ret;
	unsigned int reg_val;
	struct lm3639_chip_data *pchip;

	pchip = container_of(cdev, struct lm3639_chip_data, cdev_flash);

	ret = regmap_read(pchip->regmap, REG_FLAG, &reg_val);
	if (ret < 0)
		goto out;
	if (reg_val != 0)
		dev_info(pchip->dev, "last flag is 0x%x\n", reg_val);

	/* torch off before flash control */
	ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x00);
	if (ret < 0)
		goto out;

	/* brightness 0 means off state */
	if (!brightness)
		return;

	ret = regmap_update_bits(pchip->regmap,
				 REG_FL_CONF_1, 0x0F, brightness - 1);
	if (ret < 0)
		goto out;
	ret = regmap_update_bits(pchip->regmap, REG_ENABLE, 0x06, 0x06);
	if (ret < 0)
		goto out;

	return;
out:
	dev_err(pchip->dev, "i2c failed to access register\n");
}

static const struct regmap_config lm3639_regmap = {
	.reg_bits = 8,
	.val_bits = 8,
	.max_register = REG_MAX,
};

static int lm3639_probe(struct i2c_client *client,
				  const struct i2c_device_id *id)
{
	int ret;
	struct lm3639_chip_data *pchip;
	struct lm3639_platform_data *pdata = dev_get_platdata(&client->dev);
	struct backlight_properties props;

	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;
	}

	pchip = devm_kzalloc(&client->dev,
			     sizeof(struct lm3639_chip_data), GFP_KERNEL);
	if (!pchip)
		return -ENOMEM;

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

	pchip->regmap = devm_regmap_init_i2c(client, &lm3639_regmap);
	if (IS_ERR(pchip->regmap)) {
		ret = PTR_ERR(pchip->regmap);
		dev_err(&client->dev, "fail : allocate register map: %d\n",
			ret);
		return ret;
	}
	i2c_set_clientdata(client, pchip);

	/* chip initialize */
	ret = lm3639_chip_init(pchip);
	if (ret < 0) {
		dev_err(&client->dev, "fail : chip init\n");
		goto err_out;
	}

	/* backlight */
	props.type = BACKLIGHT_RAW;
	props.brightness = pdata->init_brt_led;
	props.max_brightness = pdata->max_brt_led;
	pchip->bled =
	    devm_backlight_device_register(pchip->dev, "lm3639_bled",
					   pchip->dev, pchip, &lm3639_bled_ops,
					   &props);
	if (IS_ERR(pchip->bled)) {
		dev_err(&client->dev, "fail : backlight register\n");
		ret = PTR_ERR(pchip->bled);
		goto err_out;
	}

	ret = device_create_file(&(pchip->bled->dev), &dev_attr_bled_mode);
	if (ret < 0) {
		dev_err(&client->dev, "failed : add sysfs entries\n");
		goto err_out;
	}

	/* flash */
	pchip->cdev_flash.name = "lm3639_flash";
	pchip->cdev_flash.max_brightness = 16;
	pchip->cdev_flash.brightness_set = lm3639_flash_brightness_set;
	ret = led_classdev_register((struct device *)
				    &client->dev, &pchip->cdev_flash);
	if (ret < 0) {
		dev_err(&client->dev, "fail : flash register\n");
		goto err_flash;
	}

	/* torch */
	pchip->cdev_torch.name = "lm3639_torch";
	pchip->cdev_torch.max_brightness = 8;
	pchip->cdev_torch.brightness_set = lm3639_torch_brightness_set;
	ret = led_classdev_register((struct device *)
				    &client->dev, &pchip->cdev_torch);
	if (ret < 0) {
		dev_err(&client->dev, "fail : torch register\n");
		goto err_torch;
	}

	return 0;

err_torch:
	led_classdev_unregister(&pchip->cdev_flash);
err_flash:
	device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode);
err_out:
	return ret;
}

static int lm3639_remove(struct i2c_client *client)
{
	struct lm3639_chip_data *pchip = i2c_get_clientdata(client);

	regmap_write(pchip->regmap, REG_ENABLE, 0x00);

	led_classdev_unregister(&pchip->cdev_torch);
	led_classdev_unregister(&pchip->cdev_flash);
	if (pchip->bled)
		device_remove_file(&(pchip->bled->dev), &dev_attr_bled_mode);
	return 0;
}

static const struct i2c_device_id lm3639_id[] = {
	{LM3639_NAME, 0},
	{}
};

MODULE_DEVICE_TABLE(i2c, lm3639_id);
static struct i2c_driver lm3639_i2c_driver = {
	.driver = {
		   .name = LM3639_NAME,
		   },
	.probe = lm3639_probe,
	.remove = lm3639_remove,
	.id_table = lm3639_id,
};

module_i2c_driver(lm3639_i2c_driver);

MODULE_DESCRIPTION("Texas Instruments Backlight+Flash LED driver for LM3639");
MODULE_AUTHOR("Daniel Jeong <gshark.jeong@gmail.com>");
MODULE_AUTHOR("Ldd Mlp <ldd-mlp@list.ti.com>");
MODULE_LICENSE("GPL v2");