summaryrefslogtreecommitdiffstats
path: root/drivers/regulator/pcf50633-regulator.c
blob: 02c9e1c5d4ca1a43d4fd2eae34278e39153d5049 (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
/* NXP PCF50633 PMIC Driver
 *
 * (C) 2006-2008 by Openmoko, Inc.
 * Author: Balaji Rao <balajirrao@openmoko.org>
 * All rights reserved.
 *
 * Broken down from monstrous PCF50633 driver mainly by
 * Harald Welte and Andy Green and Werner Almesberger
 *
 *  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/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/platform_device.h>

#include <linux/mfd/pcf50633/core.h>
#include <linux/mfd/pcf50633/pmic.h>

#define PCF50633_REGULATOR(_name, _id, _n)			\
	{							\
		.name = _name,					\
		.id = PCF50633_REGULATOR_##_id,			\
		.ops = &pcf50633_regulator_ops,			\
		.n_voltages = _n,				\
		.type = REGULATOR_VOLTAGE,			\
		.owner = THIS_MODULE,				\
		.vsel_reg = PCF50633_REG_##_id##OUT,		\
		.vsel_mask = 0xff,				\
		.enable_reg = PCF50633_REG_##_id##OUT + 1,	\
		.enable_mask = PCF50633_REGULATOR_ON,		\
	}

/* Bits from voltage value */
static u8 auto_voltage_bits(unsigned int millivolts)
{
	if (millivolts < 1800)
		return 0x2f;
	if (millivolts > 3800)
		return 0xff;

	millivolts -= 625;

	return millivolts / 25;
}

static u8 down_voltage_bits(unsigned int millivolts)
{
	if (millivolts < 625)
		return 0;
	else if (millivolts > 3000)
		return 0xff;

	millivolts -= 625;

	return millivolts / 25;
}

static u8 ldo_voltage_bits(unsigned int millivolts)
{
	if (millivolts < 900)
		return 0;
	else if (millivolts > 3600)
		return 0x1f;

	millivolts -= 900;
	return millivolts / 100;
}

/* Obtain voltage value from bits */
static unsigned int auto_voltage_value(u8 bits)
{
	/* AUTOOUT: 00000000 to 00101110 are reserved.
	 * Return 0 for bits in reserved range, which means this selector code
	 * can't be used on this system */
	if (bits < 0x2f)
		return 0;

	return 625 + (bits * 25);
}


static unsigned int down_voltage_value(u8 bits)
{
	return 625 + (bits * 25);
}


static unsigned int ldo_voltage_value(u8 bits)
{
	bits &= 0x1f;

	return 900 + (bits * 100);
}

static int pcf50633_regulator_map_voltage(struct regulator_dev *rdev,
					  int min_uV, int max_uV)
{
	struct pcf50633 *pcf;
	int regulator_id, millivolts;
	u8 volt_bits;

	pcf = rdev_get_drvdata(rdev);

	regulator_id = rdev_get_id(rdev);
	if (regulator_id >= PCF50633_NUM_REGULATORS)
		return -EINVAL;

	millivolts = min_uV / 1000;

	switch (regulator_id) {
	case PCF50633_REGULATOR_AUTO:
		volt_bits = auto_voltage_bits(millivolts);
		break;
	case PCF50633_REGULATOR_DOWN1:
	case PCF50633_REGULATOR_DOWN2:
		volt_bits = down_voltage_bits(millivolts);
		break;
	case PCF50633_REGULATOR_LDO1:
	case PCF50633_REGULATOR_LDO2:
	case PCF50633_REGULATOR_LDO3:
	case PCF50633_REGULATOR_LDO4:
	case PCF50633_REGULATOR_LDO5:
	case PCF50633_REGULATOR_LDO6:
	case PCF50633_REGULATOR_HCLDO:
	case PCF50633_REGULATOR_MEMLDO:
		volt_bits = ldo_voltage_bits(millivolts);
		break;
	default:
		return -EINVAL;
	}

	return volt_bits;
}

static int pcf50633_regulator_list_voltage(struct regulator_dev *rdev,
						unsigned int index)
{
	int regulator_id = rdev_get_id(rdev);

	int millivolts;

	switch (regulator_id) {
	case PCF50633_REGULATOR_AUTO:
		millivolts = auto_voltage_value(index);
		break;
	case PCF50633_REGULATOR_DOWN1:
	case PCF50633_REGULATOR_DOWN2:
		millivolts = down_voltage_value(index);
		break;
	case PCF50633_REGULATOR_LDO1:
	case PCF50633_REGULATOR_LDO2:
	case PCF50633_REGULATOR_LDO3:
	case PCF50633_REGULATOR_LDO4:
	case PCF50633_REGULATOR_LDO5:
	case PCF50633_REGULATOR_LDO6:
	case PCF50633_REGULATOR_HCLDO:
	case PCF50633_REGULATOR_MEMLDO:
		millivolts = ldo_voltage_value(index);
		break;
	default:
		return -EINVAL;
	}

	return millivolts * 1000;
}

static struct regulator_ops pcf50633_regulator_ops = {
	.set_voltage_sel = regulator_set_voltage_sel_regmap,
	.get_voltage_sel = regulator_get_voltage_sel_regmap,
	.list_voltage = pcf50633_regulator_list_voltage,
	.map_voltage = pcf50633_regulator_map_voltage,
	.enable = regulator_enable_regmap,
	.disable = regulator_disable_regmap,
	.is_enabled = regulator_is_enabled_regmap,
};

static const struct regulator_desc regulators[] = {
	[PCF50633_REGULATOR_AUTO] = PCF50633_REGULATOR("auto", AUTO, 128),
	[PCF50633_REGULATOR_DOWN1] = PCF50633_REGULATOR("down1", DOWN1, 96),
	[PCF50633_REGULATOR_DOWN2] = PCF50633_REGULATOR("down2", DOWN2, 96),
	[PCF50633_REGULATOR_LDO1] = PCF50633_REGULATOR("ldo1", LDO1, 28),
	[PCF50633_REGULATOR_LDO2] = PCF50633_REGULATOR("ldo2", LDO2, 28),
	[PCF50633_REGULATOR_LDO3] = PCF50633_REGULATOR("ldo3", LDO3, 28),
	[PCF50633_REGULATOR_LDO4] = PCF50633_REGULATOR("ldo4", LDO4, 28),
	[PCF50633_REGULATOR_LDO5] = PCF50633_REGULATOR("ldo5", LDO5, 28),
	[PCF50633_REGULATOR_LDO6] = PCF50633_REGULATOR("ldo6", LDO6, 28),
	[PCF50633_REGULATOR_HCLDO] = PCF50633_REGULATOR("hcldo", HCLDO, 28),
	[PCF50633_REGULATOR_MEMLDO] = PCF50633_REGULATOR("memldo", MEMLDO, 28),
};

static int __devinit pcf50633_regulator_probe(struct platform_device *pdev)
{
	struct regulator_dev *rdev;
	struct pcf50633 *pcf;
	struct regulator_config config = { };

	/* Already set by core driver */
	pcf = dev_to_pcf50633(pdev->dev.parent);

	config.dev = &pdev->dev;
	config.init_data = pdev->dev.platform_data;
	config.driver_data = pcf;
	config.regmap = pcf->regmap;

	rdev = regulator_register(&regulators[pdev->id], &config);
	if (IS_ERR(rdev))
		return PTR_ERR(rdev);

	platform_set_drvdata(pdev, rdev);

	if (pcf->pdata->regulator_registered)
		pcf->pdata->regulator_registered(pcf, pdev->id);

	return 0;
}

static int __devexit pcf50633_regulator_remove(struct platform_device *pdev)
{
	struct regulator_dev *rdev = platform_get_drvdata(pdev);

	platform_set_drvdata(pdev, NULL);
	regulator_unregister(rdev);

	return 0;
}

static struct platform_driver pcf50633_regulator_driver = {
	.driver = {
		.name = "pcf50633-regltr",
	},
	.probe = pcf50633_regulator_probe,
	.remove = pcf50633_regulator_remove,
};

static int __init pcf50633_regulator_init(void)
{
	return platform_driver_register(&pcf50633_regulator_driver);
}
subsys_initcall(pcf50633_regulator_init);

static void __exit pcf50633_regulator_exit(void)
{
	platform_driver_unregister(&pcf50633_regulator_driver);
}
module_exit(pcf50633_regulator_exit);

MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
MODULE_DESCRIPTION("PCF50633 regulator driver");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:pcf50633-regulator");