summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/ab8500.c
blob: 28c7ae67cec9ea1d573c94b30d8732f7770340b0 (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
/*
 * Copyright (C) ST-Ericsson SA 2010
 *
 * License Terms: GNU General Public License v2
 *
 * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
 *
 * AB8500 peripheral regulators
 *
 * AB8500 supports the following regulators,
 * LDOs - VAUDIO, VANAMIC2/2, VDIGMIC, VINTCORE12, VTVOUT,
 *        VAUX1/2/3, VANA
 *
 * for DB8500 cut 1.0 and previous versions of the silicon, all accesses
 * to registers are through the DB8500 SPI. In cut 1.1 onwards, these
 * accesses are through the DB8500 PRCMU I2C
 *
 */
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/err.h>
#include <linux/platform_device.h>
#include <linux/mfd/ab8500.h>
#include <linux/regulator/driver.h>
#include <linux/regulator/machine.h>
#include <linux/regulator/ab8500.h>

/**
 * struct ab8500_regulator_info - ab8500 regulator information
 * @desc: regulator description
 * @ab8500: ab8500 parent
 * @regulator_dev: regulator device
 * @max_uV: maximum voltage (for variable voltage supplies)
 * @min_uV: minimum voltage (for variable voltage supplies)
 * @fixed_uV: typical voltage (for fixed voltage supplies)
 * @update_reg: register to control on/off
 * @mask: mask to enable/disable regulator
 * @enable: bits to enable the regulator in normal(high power) mode
 * @voltage_reg: register to control regulator voltage
 * @voltage_mask: mask to control regulator voltage
 * @supported_voltages: supported voltage table
 * @voltages_len: number of supported voltages for the regulator
 */
struct ab8500_regulator_info {
	struct device		*dev;
	struct regulator_desc	desc;
	struct ab8500		*ab8500;
	struct regulator_dev	*regulator;
	int max_uV;
	int min_uV;
	int fixed_uV;
	int update_reg;
	int mask;
	int enable;
	int voltage_reg;
	int voltage_mask;
	int const *supported_voltages;
	int voltages_len;
};

/* voltage tables for the vauxn/vintcore supplies */
static const int ldo_vauxn_voltages[] = {
	1100000,
	1200000,
	1300000,
	1400000,
	1500000,
	1800000,
	1850000,
	1900000,
	2500000,
	2650000,
	2700000,
	2750000,
	2800000,
	2900000,
	3000000,
	3300000,
};

static const int ldo_vintcore_voltages[] = {
	1200000,
	1225000,
	1250000,
	1275000,
	1300000,
	1325000,
	1350000,
};

static int ab8500_regulator_enable(struct regulator_dev *rdev)
{
	int regulator_id, ret;
	struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);

	regulator_id = rdev_get_id(rdev);
	if (regulator_id >= AB8500_NUM_REGULATORS)
		return -EINVAL;

	ret = ab8500_set_bits(info->ab8500, info->update_reg,
			info->mask, info->enable);
	if (ret < 0)
		dev_err(rdev_get_dev(rdev),
			"couldn't set enable bits for regulator\n");
	return ret;
}

static int ab8500_regulator_disable(struct regulator_dev *rdev)
{
	int regulator_id, ret;
	struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);

	regulator_id = rdev_get_id(rdev);
	if (regulator_id >= AB8500_NUM_REGULATORS)
		return -EINVAL;

	ret = ab8500_set_bits(info->ab8500, info->update_reg,
			info->mask, 0x0);
	if (ret < 0)
		dev_err(rdev_get_dev(rdev),
			"couldn't set disable bits for regulator\n");
	return ret;
}

static int ab8500_regulator_is_enabled(struct regulator_dev *rdev)
{
	int regulator_id, ret;
	struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);

	regulator_id = rdev_get_id(rdev);
	if (regulator_id >= AB8500_NUM_REGULATORS)
		return -EINVAL;

	ret = ab8500_read(info->ab8500, info->update_reg);
	if (ret < 0) {
		dev_err(rdev_get_dev(rdev),
			"couldn't read 0x%x register\n", info->update_reg);
		return ret;
	}

	if (ret & info->mask)
		return true;
	else
		return false;
}

static int ab8500_list_voltage(struct regulator_dev *rdev, unsigned selector)
{
	int regulator_id;
	struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);

	regulator_id = rdev_get_id(rdev);
	if (regulator_id >= AB8500_NUM_REGULATORS)
		return -EINVAL;

	/* return the uV for the fixed regulators */
	if (info->fixed_uV)
		return info->fixed_uV;

	if (selector >= info->voltages_len)
		return -EINVAL;

	return info->supported_voltages[selector];
}

static int ab8500_regulator_get_voltage(struct regulator_dev *rdev)
{
	int regulator_id, ret, val;
	struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);

	regulator_id = rdev_get_id(rdev);
	if (regulator_id >= AB8500_NUM_REGULATORS)
		return -EINVAL;

	ret = ab8500_read(info->ab8500, info->voltage_reg);
	if (ret < 0) {
		dev_err(rdev_get_dev(rdev),
			"couldn't read voltage reg for regulator\n");
		return ret;
	}

	/* vintcore has a different layout */
	val = ret & info->voltage_mask;
	if (regulator_id == AB8500_LDO_INTCORE)
		ret = info->supported_voltages[val >> 0x3];
	else
		ret = info->supported_voltages[val];

	return ret;
}

static int ab8500_get_best_voltage_index(struct regulator_dev *rdev,
		int min_uV, int max_uV)
{
	struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);
	int i;

	/* check the supported voltage */
	for (i = 0; i < info->voltages_len; i++) {
		if ((info->supported_voltages[i] >= min_uV) &&
		    (info->supported_voltages[i] <= max_uV))
			return i;
	}

	return -EINVAL;
}

static int ab8500_regulator_set_voltage(struct regulator_dev *rdev,
		int min_uV, int max_uV)
{
	int regulator_id, ret;
	struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);

	regulator_id = rdev_get_id(rdev);
	if (regulator_id >= AB8500_NUM_REGULATORS)
		return -EINVAL;

	/* get the appropriate voltages within the range */
	ret = ab8500_get_best_voltage_index(rdev, min_uV, max_uV);
	if (ret < 0) {
		dev_err(rdev_get_dev(rdev),
				"couldn't get best voltage for regulator\n");
		return ret;
	}

	/* set the registers for the request */
	ret = ab8500_set_bits(info->ab8500, info->voltage_reg,
				info->voltage_mask, ret);
	if (ret < 0)
		dev_err(rdev_get_dev(rdev),
		"couldn't set voltage reg for regulator\n");

	return ret;
}

static struct regulator_ops ab8500_regulator_ops = {
	.enable		= ab8500_regulator_enable,
	.disable	= ab8500_regulator_disable,
	.is_enabled	= ab8500_regulator_is_enabled,
	.get_voltage	= ab8500_regulator_get_voltage,
	.set_voltage	= ab8500_regulator_set_voltage,
	.list_voltage	= ab8500_list_voltage,
};

static int ab8500_fixed_get_voltage(struct regulator_dev *rdev)
{
	int regulator_id;
	struct ab8500_regulator_info *info = rdev_get_drvdata(rdev);

	regulator_id = rdev_get_id(rdev);
	if (regulator_id >= AB8500_NUM_REGULATORS)
		return -EINVAL;

	return info->fixed_uV;
}

static struct regulator_ops ab8500_ldo_fixed_ops = {
	.enable		= ab8500_regulator_enable,
	.disable	= ab8500_regulator_disable,
	.is_enabled	= ab8500_regulator_is_enabled,
	.get_voltage	= ab8500_fixed_get_voltage,
	.list_voltage	= ab8500_list_voltage,
};

#define AB8500_LDO(_id, min, max, reg, reg_mask, reg_enable,	\
		volt_reg, volt_mask, voltages,			\
			len_volts)				\
{								\
	.desc	= {						\
		.name	= "LDO-" #_id,				\
		.ops	= &ab8500_regulator_ops,		\
		.type	= REGULATOR_VOLTAGE,			\
		.id	= AB8500_LDO_##_id,			\
		.owner	= THIS_MODULE,				\
	},							\
	.min_uV		= (min) * 1000,				\
	.max_uV		= (max) * 1000,				\
	.update_reg	= reg,					\
	.mask		= reg_mask,				\
	.enable		= reg_enable,				\
	.voltage_reg	= volt_reg,				\
	.voltage_mask	= volt_mask,				\
	.supported_voltages = voltages,				\
	.voltages_len	= len_volts,				\
	.fixed_uV	= 0,					\
}

#define AB8500_FIXED_LDO(_id, fixed, reg, reg_mask,	\
				reg_enable)		\
{							\
	.desc	= {					\
		.name	= "LDO-" #_id,			\
		.ops	= &ab8500_ldo_fixed_ops,	\
		.type	= REGULATOR_VOLTAGE,		\
		.id	= AB8500_LDO_##_id,		\
		.owner	= THIS_MODULE,			\
	},						\
	.fixed_uV	= fixed * 1000,			\
	.update_reg	= reg,				\
	.mask		= reg_mask,			\
	.enable		= reg_enable,			\
}

static struct ab8500_regulator_info ab8500_regulator_info[] = {
	/*
	 * Variable Voltage LDOs
	 * name, min uV, max uV, ctrl reg, reg mask, enable mask,
	 *	volt ctrl reg, volt ctrl mask, volt table, num supported volts
	 */
	AB8500_LDO(AUX1, 1100, 3300, 0x0409, 0x3, 0x1, 0x041f, 0xf,
			ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)),
	AB8500_LDO(AUX2, 1100, 3300, 0x0409, 0xc, 0x4, 0x0420, 0xf,
			ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)),
	AB8500_LDO(AUX3, 1100, 3300, 0x040a, 0x3, 0x1, 0x0421, 0xf,
			ldo_vauxn_voltages, ARRAY_SIZE(ldo_vauxn_voltages)),
	AB8500_LDO(INTCORE, 1100, 3300, 0x0380, 0x4, 0x4, 0x0380, 0x38,
		ldo_vintcore_voltages, ARRAY_SIZE(ldo_vintcore_voltages)),

	/*
	 * Fixed Voltage LDOs
	 *		 name,	o/p uV, ctrl reg, enable, disable
	 */
	AB8500_FIXED_LDO(TVOUT,	  2000,   0x0380,   0x2,    0x2),
	AB8500_FIXED_LDO(AUDIO,   2000,   0x0383,   0x2,    0x2),
	AB8500_FIXED_LDO(ANAMIC1, 2050,   0x0383,   0x4,    0x4),
	AB8500_FIXED_LDO(ANAMIC2, 2050,   0x0383,   0x8,    0x8),
	AB8500_FIXED_LDO(DMIC,    1800,   0x0383,   0x10,   0x10),
	AB8500_FIXED_LDO(ANA,     1200,   0x0383,   0xc,    0x4),
};

static inline struct ab8500_regulator_info *find_regulator_info(int id)
{
	struct ab8500_regulator_info *info;
	int i;

	for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) {
		info = &ab8500_regulator_info[i];
		if (info->desc.id == id)
			return info;
	}
	return NULL;
}

static __devinit int ab8500_regulator_probe(struct platform_device *pdev)
{
	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
	struct ab8500_platform_data *pdata;
	int i, err;

	if (!ab8500) {
		dev_err(&pdev->dev, "null mfd parent\n");
		return -EINVAL;
	}
	pdata = dev_get_platdata(ab8500->dev);

	/* register all regulators */
	for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) {
		struct ab8500_regulator_info *info = NULL;

		/* assign per-regulator data */
		info = &ab8500_regulator_info[i];
		info->dev = &pdev->dev;
		info->ab8500 = ab8500;

		info->regulator = regulator_register(&info->desc, &pdev->dev,
				pdata->regulator[i], info);
		if (IS_ERR(info->regulator)) {
			err = PTR_ERR(info->regulator);
			dev_err(&pdev->dev, "failed to register regulator %s\n",
					info->desc.name);
			/* when we fail, un-register all earlier regulators */
			while (--i >= 0) {
				info = &ab8500_regulator_info[i];
				regulator_unregister(info->regulator);
			}
			return err;
		}
	}

	return 0;
}

static __devexit int ab8500_regulator_remove(struct platform_device *pdev)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(ab8500_regulator_info); i++) {
		struct ab8500_regulator_info *info = NULL;
		info = &ab8500_regulator_info[i];
		regulator_unregister(info->regulator);
	}

	return 0;
}

static struct platform_driver ab8500_regulator_driver = {
	.probe = ab8500_regulator_probe,
	.remove = __devexit_p(ab8500_regulator_remove),
	.driver         = {
		.name   = "ab8500-regulator",
		.owner  = THIS_MODULE,
	},
};

static int __init ab8500_regulator_init(void)
{
	int ret;

	ret = platform_driver_register(&ab8500_regulator_driver);
	if (ret != 0)
		pr_err("Failed to register ab8500 regulator: %d\n", ret);

	return ret;
}
subsys_initcall(ab8500_regulator_init);

static void __exit ab8500_regulator_exit(void)
{
	platform_driver_unregister(&ab8500_regulator_driver);
}
module_exit(ab8500_regulator_exit);

MODULE_LICENSE("GPL v2");
MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
MODULE_DESCRIPTION("Regulator Driver for ST-Ericsson AB8500 Mixed-Sig PMIC");
MODULE_ALIAS("platform:ab8500-regulator");
OpenPOWER on IntegriCloud