summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/lp3971.c
blob: e10726a9f4550f1e7350b3cb42fe7e9070e9fcbe (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
/*
 * Regulator driver for National Semiconductors LP3971 PMIC chip
 *
 *  Copyright (C) 2009 Samsung Electronics
 *  Author: Marek Szyprowski <m.szyprowski@samsung.com>
 *
 * Based on wm8350.c
 *
 * 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/bug.h>
#include <linux/err.h>
#include <linux/i2c.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/lp3971.h>
#include <linux/slab.h>

struct lp3971 {
	struct device *dev;
	struct mutex io_lock;
	struct i2c_client *i2c;
	int num_regulators;
	struct regulator_dev **rdev;
};

static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg);
static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val);

#define LP3971_SYS_CONTROL1_REG 0x07

/* System control register 1 initial value,
   bits 4 and 5 are EPROM programmable */
#define SYS_CONTROL1_INIT_VAL 0x40
#define SYS_CONTROL1_INIT_MASK 0xCF

#define LP3971_BUCK_VOL_ENABLE_REG 0x10
#define LP3971_BUCK_VOL_CHANGE_REG 0x20

/*	Voltage control registers shift:
	LP3971_BUCK1 -> 0
	LP3971_BUCK2 -> 4
	LP3971_BUCK3 -> 6
*/
#define BUCK_VOL_CHANGE_SHIFT(x) (((!!x) << 2) | (x & ~0x01))
#define BUCK_VOL_CHANGE_FLAG_GO 0x01
#define BUCK_VOL_CHANGE_FLAG_TARGET 0x02
#define BUCK_VOL_CHANGE_FLAG_MASK 0x03

#define LP3971_BUCK1_BASE 0x23
#define LP3971_BUCK2_BASE 0x29
#define LP3971_BUCK3_BASE 0x32

static const int buck_base_addr[] = {
	LP3971_BUCK1_BASE,
	LP3971_BUCK2_BASE,
	LP3971_BUCK3_BASE,
};

#define LP3971_BUCK_TARGET_VOL1_REG(x) (buck_base_addr[x])
#define LP3971_BUCK_TARGET_VOL2_REG(x) (buck_base_addr[x]+1)

static const unsigned int buck_voltage_map[] = {
	      0,  800000,  850000,  900000,  950000, 1000000, 1050000, 1100000,
	1150000, 1200000, 1250000, 1300000, 1350000, 1400000, 1450000, 1500000,
	1550000, 1600000, 1650000, 1700000, 1800000, 1900000, 2500000, 2800000,
	3000000, 3300000,
};

#define BUCK_TARGET_VOL_MASK 0x3f
#define BUCK_TARGET_VOL_MIN_IDX 0x01
#define BUCK_TARGET_VOL_MAX_IDX 0x19

#define LP3971_BUCK_RAMP_REG(x)	(buck_base_addr[x]+2)

#define LP3971_LDO_ENABLE_REG 0x12
#define LP3971_LDO_VOL_CONTR_BASE 0x39

/*	Voltage control registers:
	LP3971_LDO1 -> LP3971_LDO_VOL_CONTR_BASE + 0
	LP3971_LDO2 -> LP3971_LDO_VOL_CONTR_BASE + 0
	LP3971_LDO3 -> LP3971_LDO_VOL_CONTR_BASE + 1
	LP3971_LDO4 -> LP3971_LDO_VOL_CONTR_BASE + 1
	LP3971_LDO5 -> LP3971_LDO_VOL_CONTR_BASE + 2
*/
#define LP3971_LDO_VOL_CONTR_REG(x)	(LP3971_LDO_VOL_CONTR_BASE + (x >> 1))

/*	Voltage control registers shift:
	LP3971_LDO1 -> 0, LP3971_LDO2 -> 4
	LP3971_LDO3 -> 0, LP3971_LDO4 -> 4
	LP3971_LDO5 -> 0
*/
#define LDO_VOL_CONTR_SHIFT(x) ((x & 1) << 2)
#define LDO_VOL_CONTR_MASK 0x0f

static const unsigned int ldo45_voltage_map[] = {
	1000000, 1050000, 1100000, 1150000, 1200000, 1250000, 1300000, 1350000,
	1400000, 1500000, 1800000, 1900000, 2500000, 2800000, 3000000, 3300000,
};

static const unsigned int ldo123_voltage_map[] = {
	1800000, 1900000, 2000000, 2100000, 2200000, 2300000, 2400000, 2500000,
	2600000, 2700000, 2800000, 2900000, 3000000, 3100000, 3200000, 3300000,
};

#define LDO_VOL_MIN_IDX 0x00
#define LDO_VOL_MAX_IDX 0x0f

static int lp3971_ldo_is_enabled(struct regulator_dev *dev)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	u16 mask = 1 << (1 + ldo);
	u16 val;

	val = lp3971_reg_read(lp3971, LP3971_LDO_ENABLE_REG);
	return (val & mask) != 0;
}

static int lp3971_ldo_enable(struct regulator_dev *dev)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	u16 mask = 1 << (1 + ldo);

	return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, mask);
}

static int lp3971_ldo_disable(struct regulator_dev *dev)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	u16 mask = 1 << (1 + ldo);

	return lp3971_set_bits(lp3971, LP3971_LDO_ENABLE_REG, mask, 0);
}

static int lp3971_ldo_get_voltage(struct regulator_dev *dev)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int ldo = rdev_get_id(dev) - LP3971_LDO1;
	u16 val, reg;

	reg = lp3971_reg_read(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo));
	val = (reg >> LDO_VOL_CONTR_SHIFT(ldo)) & LDO_VOL_CONTR_MASK;

	return dev->desc->volt_table[val];
}

static int lp3971_ldo_set_voltage_sel(struct regulator_dev *dev,
				      unsigned int selector)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int ldo = rdev_get_id(dev) - LP3971_LDO1;

	return lp3971_set_bits(lp3971, LP3971_LDO_VOL_CONTR_REG(ldo),
			LDO_VOL_CONTR_MASK << LDO_VOL_CONTR_SHIFT(ldo),
			selector << LDO_VOL_CONTR_SHIFT(ldo));
}

static struct regulator_ops lp3971_ldo_ops = {
	.list_voltage = regulator_list_voltage_table,
	.is_enabled = lp3971_ldo_is_enabled,
	.enable = lp3971_ldo_enable,
	.disable = lp3971_ldo_disable,
	.get_voltage = lp3971_ldo_get_voltage,
	.set_voltage_sel = lp3971_ldo_set_voltage_sel,
};

static int lp3971_dcdc_is_enabled(struct regulator_dev *dev)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	u16 mask = 1 << (buck * 2);
	u16 val;

	val = lp3971_reg_read(lp3971, LP3971_BUCK_VOL_ENABLE_REG);
	return (val & mask) != 0;
}

static int lp3971_dcdc_enable(struct regulator_dev *dev)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	u16 mask = 1 << (buck * 2);

	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, mask);
}

static int lp3971_dcdc_disable(struct regulator_dev *dev)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	u16 mask = 1 << (buck * 2);

	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_ENABLE_REG, mask, 0);
}

static int lp3971_dcdc_get_voltage(struct regulator_dev *dev)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	u16 reg;
	int val;

	reg = lp3971_reg_read(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck));
	reg &= BUCK_TARGET_VOL_MASK;

	if (reg <= BUCK_TARGET_VOL_MAX_IDX)
		val = buck_voltage_map[reg];
	else {
		val = 0;
		dev_warn(&dev->dev, "chip reported incorrect voltage value.\n");
	}

	return val;
}

static int lp3971_dcdc_set_voltage_sel(struct regulator_dev *dev,
				       unsigned int selector)
{
	struct lp3971 *lp3971 = rdev_get_drvdata(dev);
	int buck = rdev_get_id(dev) - LP3971_DCDC1;
	int ret;

	ret = lp3971_set_bits(lp3971, LP3971_BUCK_TARGET_VOL1_REG(buck),
	       BUCK_TARGET_VOL_MASK, selector);
	if (ret)
		return ret;

	ret = lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
	       BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
	       BUCK_VOL_CHANGE_FLAG_GO << BUCK_VOL_CHANGE_SHIFT(buck));
	if (ret)
		return ret;

	return lp3971_set_bits(lp3971, LP3971_BUCK_VOL_CHANGE_REG,
	       BUCK_VOL_CHANGE_FLAG_MASK << BUCK_VOL_CHANGE_SHIFT(buck),
	       0 << BUCK_VOL_CHANGE_SHIFT(buck));
}

static struct regulator_ops lp3971_dcdc_ops = {
	.list_voltage = regulator_list_voltage_table,
	.is_enabled = lp3971_dcdc_is_enabled,
	.enable = lp3971_dcdc_enable,
	.disable = lp3971_dcdc_disable,
	.get_voltage = lp3971_dcdc_get_voltage,
	.set_voltage_sel = lp3971_dcdc_set_voltage_sel,
};

static const struct regulator_desc regulators[] = {
	{
		.name = "LDO1",
		.id = LP3971_LDO1,
		.ops = &lp3971_ldo_ops,
		.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
		.volt_table = ldo123_voltage_map,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "LDO2",
		.id = LP3971_LDO2,
		.ops = &lp3971_ldo_ops,
		.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
		.volt_table = ldo123_voltage_map,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "LDO3",
		.id = LP3971_LDO3,
		.ops = &lp3971_ldo_ops,
		.n_voltages = ARRAY_SIZE(ldo123_voltage_map),
		.volt_table = ldo123_voltage_map,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "LDO4",
		.id = LP3971_LDO4,
		.ops = &lp3971_ldo_ops,
		.n_voltages = ARRAY_SIZE(ldo45_voltage_map),
		.volt_table = ldo45_voltage_map,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "LDO5",
		.id = LP3971_LDO5,
		.ops = &lp3971_ldo_ops,
		.n_voltages = ARRAY_SIZE(ldo45_voltage_map),
		.volt_table = ldo45_voltage_map,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "DCDC1",
		.id = LP3971_DCDC1,
		.ops = &lp3971_dcdc_ops,
		.n_voltages = ARRAY_SIZE(buck_voltage_map),
		.volt_table = buck_voltage_map,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "DCDC2",
		.id = LP3971_DCDC2,
		.ops = &lp3971_dcdc_ops,
		.n_voltages = ARRAY_SIZE(buck_voltage_map),
		.volt_table = buck_voltage_map,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
	{
		.name = "DCDC3",
		.id = LP3971_DCDC3,
		.ops = &lp3971_dcdc_ops,
		.n_voltages = ARRAY_SIZE(buck_voltage_map),
		.volt_table = buck_voltage_map,
		.type = REGULATOR_VOLTAGE,
		.owner = THIS_MODULE,
	},
};

static int lp3971_i2c_read(struct i2c_client *i2c, char reg, int count,
	u16 *dest)
{
	int ret;

	if (count != 1)
		return -EIO;
	ret = i2c_smbus_read_byte_data(i2c, reg);
	if (ret < 0)
		return -EIO;

	*dest = ret;
	return 0;
}

static int lp3971_i2c_write(struct i2c_client *i2c, char reg, int count,
	const u16 *src)
{
	if (count != 1)
		return -EIO;
	return i2c_smbus_write_byte_data(i2c, reg, *src);
}

static u8 lp3971_reg_read(struct lp3971 *lp3971, u8 reg)
{
	u16 val = 0;

	mutex_lock(&lp3971->io_lock);

	lp3971_i2c_read(lp3971->i2c, reg, 1, &val);

	dev_dbg(lp3971->dev, "reg read 0x%02x -> 0x%02x\n", (int)reg,
		(unsigned)val&0xff);

	mutex_unlock(&lp3971->io_lock);

	return val & 0xff;
}

static int lp3971_set_bits(struct lp3971 *lp3971, u8 reg, u16 mask, u16 val)
{
	u16 tmp;
	int ret;

	mutex_lock(&lp3971->io_lock);

	ret = lp3971_i2c_read(lp3971->i2c, reg, 1, &tmp);
	tmp = (tmp & ~mask) | val;
	if (ret == 0) {
		ret = lp3971_i2c_write(lp3971->i2c, reg, 1, &tmp);
		dev_dbg(lp3971->dev, "reg write 0x%02x -> 0x%02x\n", (int)reg,
			(unsigned)val&0xff);
	}
	mutex_unlock(&lp3971->io_lock);

	return ret;
}

static int __devinit setup_regulators(struct lp3971 *lp3971,
				      struct lp3971_platform_data *pdata)
{
	int i, err;

	lp3971->num_regulators = pdata->num_regulators;
	lp3971->rdev = kcalloc(pdata->num_regulators,
				sizeof(struct regulator_dev *), GFP_KERNEL);
	if (!lp3971->rdev) {
		err = -ENOMEM;
		goto err_nomem;
	}

	/* Instantiate the regulators */
	for (i = 0; i < pdata->num_regulators; i++) {
		struct regulator_config config = { };
		struct lp3971_regulator_subdev *reg = &pdata->regulators[i];

		config.dev = lp3971->dev;
		config.init_data = reg->initdata;
		config.driver_data = lp3971;

		lp3971->rdev[i] = regulator_register(&regulators[reg->id],
						     &config);
		if (IS_ERR(lp3971->rdev[i])) {
			err = PTR_ERR(lp3971->rdev[i]);
			dev_err(lp3971->dev, "regulator init failed: %d\n",
				err);
			goto error;
		}
	}

	return 0;

error:
	while (--i >= 0)
		regulator_unregister(lp3971->rdev[i]);
	kfree(lp3971->rdev);
	lp3971->rdev = NULL;
err_nomem:
	return err;
}

static int __devinit lp3971_i2c_probe(struct i2c_client *i2c,
			    const struct i2c_device_id *id)
{
	struct lp3971 *lp3971;
	struct lp3971_platform_data *pdata = i2c->dev.platform_data;
	int ret;
	u16 val;

	if (!pdata) {
		dev_dbg(&i2c->dev, "No platform init data supplied\n");
		return -ENODEV;
	}

	lp3971 = kzalloc(sizeof(struct lp3971), GFP_KERNEL);
	if (lp3971 == NULL)
		return -ENOMEM;

	lp3971->i2c = i2c;
	lp3971->dev = &i2c->dev;

	mutex_init(&lp3971->io_lock);

	/* Detect LP3971 */
	ret = lp3971_i2c_read(i2c, LP3971_SYS_CONTROL1_REG, 1, &val);
	if (ret == 0 && (val & SYS_CONTROL1_INIT_MASK) != SYS_CONTROL1_INIT_VAL)
		ret = -ENODEV;
	if (ret < 0) {
		dev_err(&i2c->dev, "failed to detect device\n");
		goto err_detect;
	}

	ret = setup_regulators(lp3971, pdata);
	if (ret < 0)
		goto err_detect;

	i2c_set_clientdata(i2c, lp3971);
	return 0;

err_detect:
	kfree(lp3971);
	return ret;
}

static int __devexit lp3971_i2c_remove(struct i2c_client *i2c)
{
	struct lp3971 *lp3971 = i2c_get_clientdata(i2c);
	int i;

	for (i = 0; i < lp3971->num_regulators; i++)
		regulator_unregister(lp3971->rdev[i]);

	kfree(lp3971->rdev);
	kfree(lp3971);

	return 0;
}

static const struct i2c_device_id lp3971_i2c_id[] = {
       { "lp3971", 0 },
       { }
};
MODULE_DEVICE_TABLE(i2c, lp3971_i2c_id);

static struct i2c_driver lp3971_i2c_driver = {
	.driver = {
		.name = "LP3971",
		.owner = THIS_MODULE,
	},
	.probe    = lp3971_i2c_probe,
	.remove   = lp3971_i2c_remove,
	.id_table = lp3971_i2c_id,
};

module_i2c_driver(lp3971_i2c_driver);

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Marek Szyprowski <m.szyprowski@samsung.com>");
MODULE_DESCRIPTION("LP3971 PMIC driver");