summaryrefslogtreecommitdiffstats
path: root/kernel/drivers/mfd/lm3533-core.c
blob: d42fbb667d8cf41db556ee3eb0d6f00e13ecc6bf (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
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
/*
 * lm3533-core.c -- LM3533 Core
 *
 * Copyright (C) 2011-2012 Texas Instruments
 *
 * Author: Johan Hovold <jhovold@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under  the terms of the GNU General  Public License as published by the
 * Free Software Foundation;  either version 2 of the License, or (at your
 * option) any later version.
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/gpio.h>
#include <linux/i2c.h>
#include <linux/mfd/core.h>
#include <linux/regmap.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/uaccess.h>

#include <linux/mfd/lm3533.h>


#define LM3533_BOOST_OVP_MASK		0x06
#define LM3533_BOOST_OVP_SHIFT		1

#define LM3533_BOOST_FREQ_MASK		0x01
#define LM3533_BOOST_FREQ_SHIFT		0

#define LM3533_BL_ID_MASK		1
#define LM3533_LED_ID_MASK		3
#define LM3533_BL_ID_MAX		1
#define LM3533_LED_ID_MAX		3

#define LM3533_HVLED_ID_MAX		2
#define LM3533_LVLED_ID_MAX		5

#define LM3533_REG_OUTPUT_CONF1		0x10
#define LM3533_REG_OUTPUT_CONF2		0x11
#define LM3533_REG_BOOST_PWM		0x2c

#define LM3533_REG_MAX			0xb2


static struct mfd_cell lm3533_als_devs[] = {
	{
		.name	= "lm3533-als",
		.id	= -1,
	},
};

static struct mfd_cell lm3533_bl_devs[] = {
	{
		.name	= "lm3533-backlight",
		.id	= 0,
	},
	{
		.name	= "lm3533-backlight",
		.id	= 1,
	},
};

static struct mfd_cell lm3533_led_devs[] = {
	{
		.name	= "lm3533-leds",
		.id	= 0,
	},
	{
		.name	= "lm3533-leds",
		.id	= 1,
	},
	{
		.name	= "lm3533-leds",
		.id	= 2,
	},
	{
		.name	= "lm3533-leds",
		.id	= 3,
	},
};

int lm3533_read(struct lm3533 *lm3533, u8 reg, u8 *val)
{
	int tmp;
	int ret;

	ret = regmap_read(lm3533->regmap, reg, &tmp);
	if (ret < 0) {
		dev_err(lm3533->dev, "failed to read register %02x: %d\n",
								reg, ret);
		return ret;
	}

	*val = tmp;

	dev_dbg(lm3533->dev, "read [%02x]: %02x\n", reg, *val);

	return ret;
}
EXPORT_SYMBOL_GPL(lm3533_read);

int lm3533_write(struct lm3533 *lm3533, u8 reg, u8 val)
{
	int ret;

	dev_dbg(lm3533->dev, "write [%02x]: %02x\n", reg, val);

	ret = regmap_write(lm3533->regmap, reg, val);
	if (ret < 0) {
		dev_err(lm3533->dev, "failed to write register %02x: %d\n",
								reg, ret);
	}

	return ret;
}
EXPORT_SYMBOL_GPL(lm3533_write);

int lm3533_update(struct lm3533 *lm3533, u8 reg, u8 val, u8 mask)
{
	int ret;

	dev_dbg(lm3533->dev, "update [%02x]: %02x/%02x\n", reg, val, mask);

	ret = regmap_update_bits(lm3533->regmap, reg, mask, val);
	if (ret < 0) {
		dev_err(lm3533->dev, "failed to update register %02x: %d\n",
								reg, ret);
	}

	return ret;
}
EXPORT_SYMBOL_GPL(lm3533_update);

static int lm3533_set_boost_freq(struct lm3533 *lm3533,
						enum lm3533_boost_freq freq)
{
	int ret;

	ret = lm3533_update(lm3533, LM3533_REG_BOOST_PWM,
					freq << LM3533_BOOST_FREQ_SHIFT,
					LM3533_BOOST_FREQ_MASK);
	if (ret)
		dev_err(lm3533->dev, "failed to set boost frequency\n");

	return ret;
}


static int lm3533_set_boost_ovp(struct lm3533 *lm3533,
						enum lm3533_boost_ovp ovp)
{
	int ret;

	ret = lm3533_update(lm3533, LM3533_REG_BOOST_PWM,
					ovp << LM3533_BOOST_OVP_SHIFT,
					LM3533_BOOST_OVP_MASK);
	if (ret)
		dev_err(lm3533->dev, "failed to set boost ovp\n");

	return ret;
}

/*
 * HVLED output config -- output hvled controlled by backlight bl
 */
static int lm3533_set_hvled_config(struct lm3533 *lm3533, u8 hvled, u8 bl)
{
	u8 val;
	u8 mask;
	int shift;
	int ret;

	if (hvled == 0 || hvled > LM3533_HVLED_ID_MAX)
		return -EINVAL;

	if (bl > LM3533_BL_ID_MAX)
		return -EINVAL;

	shift = hvled - 1;
	mask = LM3533_BL_ID_MASK << shift;
	val = bl << shift;

	ret = lm3533_update(lm3533, LM3533_REG_OUTPUT_CONF1, val, mask);
	if (ret)
		dev_err(lm3533->dev, "failed to set hvled config\n");

	return ret;
}

/*
 * LVLED output config -- output lvled controlled by LED led
 */
static int lm3533_set_lvled_config(struct lm3533 *lm3533, u8 lvled, u8 led)
{
	u8 reg;
	u8 val;
	u8 mask;
	int shift;
	int ret;

	if (lvled == 0 || lvled > LM3533_LVLED_ID_MAX)
		return -EINVAL;

	if (led > LM3533_LED_ID_MAX)
		return -EINVAL;

	if (lvled < 4) {
		reg = LM3533_REG_OUTPUT_CONF1;
		shift = 2 * lvled;
	} else {
		reg = LM3533_REG_OUTPUT_CONF2;
		shift = 2 * (lvled - 4);
	}

	mask = LM3533_LED_ID_MASK << shift;
	val = led << shift;

	ret = lm3533_update(lm3533, reg, val, mask);
	if (ret)
		dev_err(lm3533->dev, "failed to set lvled config\n");

	return ret;
}

static void lm3533_enable(struct lm3533 *lm3533)
{
	if (gpio_is_valid(lm3533->gpio_hwen))
		gpio_set_value(lm3533->gpio_hwen, 1);
}

static void lm3533_disable(struct lm3533 *lm3533)
{
	if (gpio_is_valid(lm3533->gpio_hwen))
		gpio_set_value(lm3533->gpio_hwen, 0);
}

enum lm3533_attribute_type {
	LM3533_ATTR_TYPE_BACKLIGHT,
	LM3533_ATTR_TYPE_LED,
};

struct lm3533_device_attribute {
	struct device_attribute dev_attr;
	enum lm3533_attribute_type type;
	union {
		struct {
			u8 id;
		} output;
	} u;
};

#define to_lm3533_dev_attr(_attr) \
	container_of(_attr, struct lm3533_device_attribute, dev_attr)

static ssize_t show_output(struct device *dev,
				struct device_attribute *attr, char *buf)
{
	struct lm3533 *lm3533 = dev_get_drvdata(dev);
	struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(attr);
	int id = lattr->u.output.id;
	u8 reg;
	u8 val;
	u8 mask;
	int shift;
	int ret;

	if (lattr->type == LM3533_ATTR_TYPE_BACKLIGHT) {
		reg = LM3533_REG_OUTPUT_CONF1;
		shift = id - 1;
		mask = LM3533_BL_ID_MASK << shift;
	} else {
		if (id < 4) {
			reg = LM3533_REG_OUTPUT_CONF1;
			shift = 2 * id;
		} else {
			reg = LM3533_REG_OUTPUT_CONF2;
			shift = 2 * (id - 4);
		}
		mask = LM3533_LED_ID_MASK << shift;
	}

	ret = lm3533_read(lm3533, reg, &val);
	if (ret)
		return ret;

	val = (val & mask) >> shift;

	return scnprintf(buf, PAGE_SIZE, "%u\n", val);
}

static ssize_t store_output(struct device *dev,
					struct device_attribute *attr,
					const char *buf, size_t len)
{
	struct lm3533 *lm3533 = dev_get_drvdata(dev);
	struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(attr);
	int id = lattr->u.output.id;
	u8 val;
	int ret;

	if (kstrtou8(buf, 0, &val))
		return -EINVAL;

	if (lattr->type == LM3533_ATTR_TYPE_BACKLIGHT)
		ret = lm3533_set_hvled_config(lm3533, id, val);
	else
		ret = lm3533_set_lvled_config(lm3533, id, val);

	if (ret)
		return ret;

	return len;
}

#define LM3533_OUTPUT_ATTR(_name, _mode, _show, _store, _type, _id) \
	struct lm3533_device_attribute lm3533_dev_attr_##_name = \
		{ .dev_attr	= __ATTR(_name, _mode, _show, _store), \
		  .type		= _type, \
		  .u.output	= { .id = _id }, }

#define LM3533_OUTPUT_ATTR_RW(_name, _type, _id) \
	LM3533_OUTPUT_ATTR(output_##_name, S_IRUGO | S_IWUSR, \
					show_output, store_output, _type, _id)

#define LM3533_OUTPUT_HVLED_ATTR_RW(_nr) \
	LM3533_OUTPUT_ATTR_RW(hvled##_nr, LM3533_ATTR_TYPE_BACKLIGHT, _nr)
#define LM3533_OUTPUT_LVLED_ATTR_RW(_nr) \
	LM3533_OUTPUT_ATTR_RW(lvled##_nr, LM3533_ATTR_TYPE_LED, _nr)
/*
 * Output config:
 *
 * output_hvled<nr>	0-1
 * output_lvled<nr>	0-3
 */
static LM3533_OUTPUT_HVLED_ATTR_RW(1);
static LM3533_OUTPUT_HVLED_ATTR_RW(2);
static LM3533_OUTPUT_LVLED_ATTR_RW(1);
static LM3533_OUTPUT_LVLED_ATTR_RW(2);
static LM3533_OUTPUT_LVLED_ATTR_RW(3);
static LM3533_OUTPUT_LVLED_ATTR_RW(4);
static LM3533_OUTPUT_LVLED_ATTR_RW(5);

static struct attribute *lm3533_attributes[] = {
	&lm3533_dev_attr_output_hvled1.dev_attr.attr,
	&lm3533_dev_attr_output_hvled2.dev_attr.attr,
	&lm3533_dev_attr_output_lvled1.dev_attr.attr,
	&lm3533_dev_attr_output_lvled2.dev_attr.attr,
	&lm3533_dev_attr_output_lvled3.dev_attr.attr,
	&lm3533_dev_attr_output_lvled4.dev_attr.attr,
	&lm3533_dev_attr_output_lvled5.dev_attr.attr,
	NULL,
};

#define to_dev_attr(_attr) \
	container_of(_attr, struct device_attribute, attr)

static umode_t lm3533_attr_is_visible(struct kobject *kobj,
					     struct attribute *attr, int n)
{
	struct device *dev = container_of(kobj, struct device, kobj);
	struct lm3533 *lm3533 = dev_get_drvdata(dev);
	struct device_attribute *dattr = to_dev_attr(attr);
	struct lm3533_device_attribute *lattr = to_lm3533_dev_attr(dattr);
	enum lm3533_attribute_type type = lattr->type;
	umode_t mode = attr->mode;

	if (!lm3533->have_backlights && type == LM3533_ATTR_TYPE_BACKLIGHT)
		mode = 0;
	else if (!lm3533->have_leds && type == LM3533_ATTR_TYPE_LED)
		mode = 0;

	return mode;
};

static struct attribute_group lm3533_attribute_group = {
	.is_visible	= lm3533_attr_is_visible,
	.attrs		= lm3533_attributes
};

static int lm3533_device_als_init(struct lm3533 *lm3533)
{
	struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
	int ret;

	if (!pdata->als)
		return 0;

	lm3533_als_devs[0].platform_data = pdata->als;
	lm3533_als_devs[0].pdata_size = sizeof(*pdata->als);

	ret = mfd_add_devices(lm3533->dev, 0, lm3533_als_devs, 1, NULL,
			      0, NULL);
	if (ret) {
		dev_err(lm3533->dev, "failed to add ALS device\n");
		return ret;
	}

	lm3533->have_als = 1;

	return 0;
}

static int lm3533_device_bl_init(struct lm3533 *lm3533)
{
	struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
	int i;
	int ret;

	if (!pdata->backlights || pdata->num_backlights == 0)
		return 0;

	if (pdata->num_backlights > ARRAY_SIZE(lm3533_bl_devs))
		pdata->num_backlights = ARRAY_SIZE(lm3533_bl_devs);

	for (i = 0; i < pdata->num_backlights; ++i) {
		lm3533_bl_devs[i].platform_data = &pdata->backlights[i];
		lm3533_bl_devs[i].pdata_size = sizeof(pdata->backlights[i]);
	}

	ret = mfd_add_devices(lm3533->dev, 0, lm3533_bl_devs,
			      pdata->num_backlights, NULL, 0, NULL);
	if (ret) {
		dev_err(lm3533->dev, "failed to add backlight devices\n");
		return ret;
	}

	lm3533->have_backlights = 1;

	return 0;
}

static int lm3533_device_led_init(struct lm3533 *lm3533)
{
	struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
	int i;
	int ret;

	if (!pdata->leds || pdata->num_leds == 0)
		return 0;

	if (pdata->num_leds > ARRAY_SIZE(lm3533_led_devs))
		pdata->num_leds = ARRAY_SIZE(lm3533_led_devs);

	for (i = 0; i < pdata->num_leds; ++i) {
		lm3533_led_devs[i].platform_data = &pdata->leds[i];
		lm3533_led_devs[i].pdata_size = sizeof(pdata->leds[i]);
	}

	ret = mfd_add_devices(lm3533->dev, 0, lm3533_led_devs,
			      pdata->num_leds, NULL, 0, NULL);
	if (ret) {
		dev_err(lm3533->dev, "failed to add LED devices\n");
		return ret;
	}

	lm3533->have_leds = 1;

	return 0;
}

static int lm3533_device_setup(struct lm3533 *lm3533,
					struct lm3533_platform_data *pdata)
{
	int ret;

	ret = lm3533_set_boost_freq(lm3533, pdata->boost_freq);
	if (ret)
		return ret;

	ret = lm3533_set_boost_ovp(lm3533, pdata->boost_ovp);
	if (ret)
		return ret;

	return 0;
}

static int lm3533_device_init(struct lm3533 *lm3533)
{
	struct lm3533_platform_data *pdata = dev_get_platdata(lm3533->dev);
	int ret;

	dev_dbg(lm3533->dev, "%s\n", __func__);

	if (!pdata) {
		dev_err(lm3533->dev, "no platform data\n");
		return -EINVAL;
	}

	lm3533->gpio_hwen = pdata->gpio_hwen;

	dev_set_drvdata(lm3533->dev, lm3533);

	if (gpio_is_valid(lm3533->gpio_hwen)) {
		ret = devm_gpio_request_one(lm3533->dev, lm3533->gpio_hwen,
					GPIOF_OUT_INIT_LOW, "lm3533-hwen");
		if (ret < 0) {
			dev_err(lm3533->dev,
				"failed to request HWEN GPIO %d\n",
				lm3533->gpio_hwen);
			return ret;
		}
	}

	lm3533_enable(lm3533);

	ret = lm3533_device_setup(lm3533, pdata);
	if (ret)
		goto err_disable;

	lm3533_device_als_init(lm3533);
	lm3533_device_bl_init(lm3533);
	lm3533_device_led_init(lm3533);

	ret = sysfs_create_group(&lm3533->dev->kobj, &lm3533_attribute_group);
	if (ret < 0) {
		dev_err(lm3533->dev, "failed to create sysfs attributes\n");
		goto err_unregister;
	}

	return 0;

err_unregister:
	mfd_remove_devices(lm3533->dev);
err_disable:
	lm3533_disable(lm3533);

	return ret;
}

static void lm3533_device_exit(struct lm3533 *lm3533)
{
	dev_dbg(lm3533->dev, "%s\n", __func__);

	sysfs_remove_group(&lm3533->dev->kobj, &lm3533_attribute_group);

	mfd_remove_devices(lm3533->dev);
	lm3533_disable(lm3533);
}

static bool lm3533_readable_register(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case 0x10 ... 0x2c:
	case 0x30 ... 0x38:
	case 0x40 ... 0x45:
	case 0x50 ... 0x57:
	case 0x60 ... 0x6e:
	case 0x70 ... 0x75:
	case 0x80 ... 0x85:
	case 0x90 ... 0x95:
	case 0xa0 ... 0xa5:
	case 0xb0 ... 0xb2:
		return true;
	default:
		return false;
	}
}

static bool lm3533_volatile_register(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case 0x34 ... 0x36:	/* zone */
	case 0x37 ... 0x38:	/* adc */
	case 0xb0 ... 0xb1:	/* fault */
		return true;
	default:
		return false;
	}
}

static bool lm3533_precious_register(struct device *dev, unsigned int reg)
{
	switch (reg) {
	case 0x34:		/* zone */
		return true;
	default:
		return false;
	}
}

static const struct regmap_config regmap_config = {
	.reg_bits	= 8,
	.val_bits	= 8,
	.max_register	= LM3533_REG_MAX,
	.readable_reg	= lm3533_readable_register,
	.volatile_reg	= lm3533_volatile_register,
	.precious_reg	= lm3533_precious_register,
};

static int lm3533_i2c_probe(struct i2c_client *i2c,
					const struct i2c_device_id *id)
{
	struct lm3533 *lm3533;
	int ret;

	dev_dbg(&i2c->dev, "%s\n", __func__);

	lm3533 = devm_kzalloc(&i2c->dev, sizeof(*lm3533), GFP_KERNEL);
	if (!lm3533)
		return -ENOMEM;

	i2c_set_clientdata(i2c, lm3533);

	lm3533->regmap = devm_regmap_init_i2c(i2c, &regmap_config);
	if (IS_ERR(lm3533->regmap))
		return PTR_ERR(lm3533->regmap);

	lm3533->dev = &i2c->dev;
	lm3533->irq = i2c->irq;

	ret = lm3533_device_init(lm3533);
	if (ret)
		return ret;

	return 0;
}

static int lm3533_i2c_remove(struct i2c_client *i2c)
{
	struct lm3533 *lm3533 = i2c_get_clientdata(i2c);

	dev_dbg(&i2c->dev, "%s\n", __func__);

	lm3533_device_exit(lm3533);

	return 0;
}

static const struct i2c_device_id lm3533_i2c_ids[] = {
	{ "lm3533", 0 },
	{ },
};
MODULE_DEVICE_TABLE(i2c, lm3533_i2c_ids);

static struct i2c_driver lm3533_i2c_driver = {
	.driver = {
		   .name = "lm3533",
		   .owner = THIS_MODULE,
	},
	.id_table	= lm3533_i2c_ids,
	.probe		= lm3533_i2c_probe,
	.remove		= lm3533_i2c_remove,
};

static int __init lm3533_i2c_init(void)
{
	return i2c_add_driver(&lm3533_i2c_driver);
}
subsys_initcall(lm3533_i2c_init);

static void __exit lm3533_i2c_exit(void)
{
	i2c_del_driver(&lm3533_i2c_driver);
}
module_exit(lm3533_i2c_exit);

MODULE_AUTHOR("Johan Hovold <jhovold@gmail.com>");
MODULE_DESCRIPTION("LM3533 Core");
MODULE_LICENSE("GPL");