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Viewing changes to drivers/regulator/pcf50633-regulator.c

  • Committer: Package Import Robot
  • Author(s): Alessio Igor Bogani
  • Date: 2011-10-26 11:13:05 UTC
  • Revision ID: package-import@ubuntu.com-20111026111305-tz023xykf0i6eosh
Tags: upstream-3.2.0
Import upstream version 3.2.0

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drivers/regulator/pcf50633-regulator.c
 
1
/* NXP PCF50633 PMIC Driver
 
2
 *
 
3
 * (C) 2006-2008 by Openmoko, Inc.
 
4
 * Author: Balaji Rao <balajirrao@openmoko.org>
 
5
 * All rights reserved.
 
6
 *
 
7
 * Broken down from monstrous PCF50633 driver mainly by
 
8
 * Harald Welte and Andy Green and Werner Almesberger
 
9
 *
 
10
 *  This program is free software; you can redistribute  it and/or modify it
 
11
 *  under  the terms of  the GNU General  Public License as published by the
 
12
 *  Free Software Foundation;  either version 2 of the  License, or (at your
 
13
 *  option) any later version.
 
14
 *
 
15
 */
 
16
 
 
17
#include <linux/kernel.h>
 
18
#include <linux/module.h>
 
19
#include <linux/init.h>
 
20
#include <linux/device.h>
 
21
#include <linux/err.h>
 
22
#include <linux/platform_device.h>
 
23
 
 
24
#include <linux/mfd/pcf50633/core.h>
 
25
#include <linux/mfd/pcf50633/pmic.h>
 
26
 
 
27
#define PCF50633_REGULATOR(_name, _id, _n)              \
 
28
        {                                       \
 
29
                .name = _name,                  \
 
30
                .id = _id,                      \
 
31
                .ops = &pcf50633_regulator_ops, \
 
32
                .n_voltages = _n, \
 
33
                .type = REGULATOR_VOLTAGE,      \
 
34
                .owner = THIS_MODULE,           \
 
35
        }
 
36
 
 
37
static const u8 pcf50633_regulator_registers[PCF50633_NUM_REGULATORS] = {
 
38
        [PCF50633_REGULATOR_AUTO]       = PCF50633_REG_AUTOOUT,
 
39
        [PCF50633_REGULATOR_DOWN1]      = PCF50633_REG_DOWN1OUT,
 
40
        [PCF50633_REGULATOR_DOWN2]      = PCF50633_REG_DOWN2OUT,
 
41
        [PCF50633_REGULATOR_MEMLDO]     = PCF50633_REG_MEMLDOOUT,
 
42
        [PCF50633_REGULATOR_LDO1]       = PCF50633_REG_LDO1OUT,
 
43
        [PCF50633_REGULATOR_LDO2]       = PCF50633_REG_LDO2OUT,
 
44
        [PCF50633_REGULATOR_LDO3]       = PCF50633_REG_LDO3OUT,
 
45
        [PCF50633_REGULATOR_LDO4]       = PCF50633_REG_LDO4OUT,
 
46
        [PCF50633_REGULATOR_LDO5]       = PCF50633_REG_LDO5OUT,
 
47
        [PCF50633_REGULATOR_LDO6]       = PCF50633_REG_LDO6OUT,
 
48
        [PCF50633_REGULATOR_HCLDO]      = PCF50633_REG_HCLDOOUT,
 
49
};
 
50
 
 
51
/* Bits from voltage value */
 
52
static u8 auto_voltage_bits(unsigned int millivolts)
 
53
{
 
54
        if (millivolts < 1800)
 
55
                return 0;
 
56
        if (millivolts > 3800)
 
57
                return 0xff;
 
58
 
 
59
        millivolts -= 625;
 
60
 
 
61
        return millivolts / 25;
 
62
}
 
63
 
 
64
static u8 down_voltage_bits(unsigned int millivolts)
 
65
{
 
66
        if (millivolts < 625)
 
67
                return 0;
 
68
        else if (millivolts > 3000)
 
69
                return 0xff;
 
70
 
 
71
        millivolts -= 625;
 
72
 
 
73
        return millivolts / 25;
 
74
}
 
75
 
 
76
static u8 ldo_voltage_bits(unsigned int millivolts)
 
77
{
 
78
        if (millivolts < 900)
 
79
                return 0;
 
80
        else if (millivolts > 3600)
 
81
                return 0x1f;
 
82
 
 
83
        millivolts -= 900;
 
84
        return millivolts / 100;
 
85
}
 
86
 
 
87
/* Obtain voltage value from bits */
 
88
static unsigned int auto_voltage_value(u8 bits)
 
89
{
 
90
        if (bits < 0x2f)
 
91
                return 0;
 
92
 
 
93
        return 625 + (bits * 25);
 
94
}
 
95
 
 
96
 
 
97
static unsigned int down_voltage_value(u8 bits)
 
98
{
 
99
        return 625 + (bits * 25);
 
100
}
 
101
 
 
102
 
 
103
static unsigned int ldo_voltage_value(u8 bits)
 
104
{
 
105
        bits &= 0x1f;
 
106
 
 
107
        return 900 + (bits * 100);
 
108
}
 
109
 
 
110
static int pcf50633_regulator_set_voltage(struct regulator_dev *rdev,
 
111
                                          int min_uV, int max_uV,
 
112
                                          unsigned *selector)
 
113
{
 
114
        struct pcf50633 *pcf;
 
115
        int regulator_id, millivolts;
 
116
        u8 volt_bits, regnr;
 
117
 
 
118
        pcf = rdev_get_drvdata(rdev);
 
119
 
 
120
        regulator_id = rdev_get_id(rdev);
 
121
        if (regulator_id >= PCF50633_NUM_REGULATORS)
 
122
                return -EINVAL;
 
123
 
 
124
        millivolts = min_uV / 1000;
 
125
 
 
126
        regnr = pcf50633_regulator_registers[regulator_id];
 
127
 
 
128
        switch (regulator_id) {
 
129
        case PCF50633_REGULATOR_AUTO:
 
130
                volt_bits = auto_voltage_bits(millivolts);
 
131
                break;
 
132
        case PCF50633_REGULATOR_DOWN1:
 
133
                volt_bits = down_voltage_bits(millivolts);
 
134
                break;
 
135
        case PCF50633_REGULATOR_DOWN2:
 
136
                volt_bits = down_voltage_bits(millivolts);
 
137
                break;
 
138
        case PCF50633_REGULATOR_LDO1:
 
139
        case PCF50633_REGULATOR_LDO2:
 
140
        case PCF50633_REGULATOR_LDO3:
 
141
        case PCF50633_REGULATOR_LDO4:
 
142
        case PCF50633_REGULATOR_LDO5:
 
143
        case PCF50633_REGULATOR_LDO6:
 
144
        case PCF50633_REGULATOR_HCLDO:
 
145
                volt_bits = ldo_voltage_bits(millivolts);
 
146
                break;
 
147
        default:
 
148
                return -EINVAL;
 
149
        }
 
150
 
 
151
        *selector = volt_bits;
 
152
 
 
153
        return pcf50633_reg_write(pcf, regnr, volt_bits);
 
154
}
 
155
 
 
156
static int pcf50633_regulator_voltage_value(enum pcf50633_regulator_id id,
 
157
                                                u8 bits)
 
158
{
 
159
        int millivolts;
 
160
 
 
161
        switch (id) {
 
162
        case PCF50633_REGULATOR_AUTO:
 
163
                millivolts = auto_voltage_value(bits);
 
164
                break;
 
165
        case PCF50633_REGULATOR_DOWN1:
 
166
                millivolts = down_voltage_value(bits);
 
167
                break;
 
168
        case PCF50633_REGULATOR_DOWN2:
 
169
                millivolts = down_voltage_value(bits);
 
170
                break;
 
171
        case PCF50633_REGULATOR_LDO1:
 
172
        case PCF50633_REGULATOR_LDO2:
 
173
        case PCF50633_REGULATOR_LDO3:
 
174
        case PCF50633_REGULATOR_LDO4:
 
175
        case PCF50633_REGULATOR_LDO5:
 
176
        case PCF50633_REGULATOR_LDO6:
 
177
        case PCF50633_REGULATOR_HCLDO:
 
178
                millivolts = ldo_voltage_value(bits);
 
179
                break;
 
180
        default:
 
181
                return -EINVAL;
 
182
        }
 
183
 
 
184
        return millivolts * 1000;
 
185
}
 
186
 
 
187
static int pcf50633_regulator_get_voltage(struct regulator_dev *rdev)
 
188
{
 
189
        struct pcf50633 *pcf;
 
190
        int regulator_id;
 
191
        u8 volt_bits, regnr;
 
192
 
 
193
        pcf = rdev_get_drvdata(rdev);
 
194
 
 
195
        regulator_id = rdev_get_id(rdev);
 
196
        if (regulator_id >= PCF50633_NUM_REGULATORS)
 
197
                return -EINVAL;
 
198
 
 
199
        regnr = pcf50633_regulator_registers[regulator_id];
 
200
 
 
201
        volt_bits = pcf50633_reg_read(pcf, regnr);
 
202
 
 
203
        return pcf50633_regulator_voltage_value(regulator_id, volt_bits);
 
204
}
 
205
 
 
206
static int pcf50633_regulator_list_voltage(struct regulator_dev *rdev,
 
207
                                                unsigned int index)
 
208
{
 
209
        struct pcf50633 *pcf;
 
210
        int regulator_id;
 
211
 
 
212
        pcf = rdev_get_drvdata(rdev);
 
213
 
 
214
        regulator_id = rdev_get_id(rdev);
 
215
 
 
216
        switch (regulator_id) {
 
217
        case PCF50633_REGULATOR_AUTO:
 
218
                index += 0x2f;
 
219
                break;
 
220
        case PCF50633_REGULATOR_HCLDO:
 
221
                index += 0x01;
 
222
                break;
 
223
        default:
 
224
                break;
 
225
        }
 
226
 
 
227
        return pcf50633_regulator_voltage_value(regulator_id, index);
 
228
}
 
229
 
 
230
static int pcf50633_regulator_enable(struct regulator_dev *rdev)
 
231
{
 
232
        struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 
233
        int regulator_id;
 
234
        u8 regnr;
 
235
 
 
236
        regulator_id = rdev_get_id(rdev);
 
237
        if (regulator_id >= PCF50633_NUM_REGULATORS)
 
238
                return -EINVAL;
 
239
 
 
240
        /* The *ENA register is always one after the *OUT register */
 
241
        regnr = pcf50633_regulator_registers[regulator_id] + 1;
 
242
 
 
243
        return pcf50633_reg_set_bit_mask(pcf, regnr, PCF50633_REGULATOR_ON,
 
244
                                                       PCF50633_REGULATOR_ON);
 
245
}
 
246
 
 
247
static int pcf50633_regulator_disable(struct regulator_dev *rdev)
 
248
{
 
249
        struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 
250
        int regulator_id;
 
251
        u8 regnr;
 
252
 
 
253
        regulator_id = rdev_get_id(rdev);
 
254
        if (regulator_id >= PCF50633_NUM_REGULATORS)
 
255
                return -EINVAL;
 
256
 
 
257
        /* the *ENA register is always one after the *OUT register */
 
258
        regnr = pcf50633_regulator_registers[regulator_id] + 1;
 
259
 
 
260
        return pcf50633_reg_set_bit_mask(pcf, regnr,
 
261
                                        PCF50633_REGULATOR_ON, 0);
 
262
}
 
263
 
 
264
static int pcf50633_regulator_is_enabled(struct regulator_dev *rdev)
 
265
{
 
266
        struct pcf50633 *pcf = rdev_get_drvdata(rdev);
 
267
        int regulator_id = rdev_get_id(rdev);
 
268
        u8 regnr;
 
269
 
 
270
        regulator_id = rdev_get_id(rdev);
 
271
        if (regulator_id >= PCF50633_NUM_REGULATORS)
 
272
                return -EINVAL;
 
273
 
 
274
        /* the *ENA register is always one after the *OUT register */
 
275
        regnr = pcf50633_regulator_registers[regulator_id] + 1;
 
276
 
 
277
        return pcf50633_reg_read(pcf, regnr) & PCF50633_REGULATOR_ON;
 
278
}
 
279
 
 
280
static struct regulator_ops pcf50633_regulator_ops = {
 
281
        .set_voltage = pcf50633_regulator_set_voltage,
 
282
        .get_voltage = pcf50633_regulator_get_voltage,
 
283
        .list_voltage = pcf50633_regulator_list_voltage,
 
284
        .enable = pcf50633_regulator_enable,
 
285
        .disable = pcf50633_regulator_disable,
 
286
        .is_enabled = pcf50633_regulator_is_enabled,
 
287
};
 
288
 
 
289
static struct regulator_desc regulators[] = {
 
290
        [PCF50633_REGULATOR_AUTO] =
 
291
                PCF50633_REGULATOR("auto", PCF50633_REGULATOR_AUTO, 80),
 
292
        [PCF50633_REGULATOR_DOWN1] =
 
293
                PCF50633_REGULATOR("down1", PCF50633_REGULATOR_DOWN1, 95),
 
294
        [PCF50633_REGULATOR_DOWN2] =
 
295
                PCF50633_REGULATOR("down2", PCF50633_REGULATOR_DOWN2, 95),
 
296
        [PCF50633_REGULATOR_LDO1] =
 
297
                PCF50633_REGULATOR("ldo1", PCF50633_REGULATOR_LDO1, 27),
 
298
        [PCF50633_REGULATOR_LDO2] =
 
299
                PCF50633_REGULATOR("ldo2", PCF50633_REGULATOR_LDO2, 27),
 
300
        [PCF50633_REGULATOR_LDO3] =
 
301
                PCF50633_REGULATOR("ldo3", PCF50633_REGULATOR_LDO3, 27),
 
302
        [PCF50633_REGULATOR_LDO4] =
 
303
                PCF50633_REGULATOR("ldo4", PCF50633_REGULATOR_LDO4, 27),
 
304
        [PCF50633_REGULATOR_LDO5] =
 
305
                PCF50633_REGULATOR("ldo5", PCF50633_REGULATOR_LDO5, 27),
 
306
        [PCF50633_REGULATOR_LDO6] =
 
307
                PCF50633_REGULATOR("ldo6", PCF50633_REGULATOR_LDO6, 27),
 
308
        [PCF50633_REGULATOR_HCLDO] =
 
309
                PCF50633_REGULATOR("hcldo", PCF50633_REGULATOR_HCLDO, 26),
 
310
        [PCF50633_REGULATOR_MEMLDO] =
 
311
                PCF50633_REGULATOR("memldo", PCF50633_REGULATOR_MEMLDO, 0),
 
312
};
 
313
 
 
314
static int __devinit pcf50633_regulator_probe(struct platform_device *pdev)
 
315
{
 
316
        struct regulator_dev *rdev;
 
317
        struct pcf50633 *pcf;
 
318
 
 
319
        /* Already set by core driver */
 
320
        pcf = dev_to_pcf50633(pdev->dev.parent);
 
321
 
 
322
        rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
 
323
                                  pdev->dev.platform_data, pcf);
 
324
        if (IS_ERR(rdev))
 
325
                return PTR_ERR(rdev);
 
326
 
 
327
        platform_set_drvdata(pdev, rdev);
 
328
 
 
329
        if (pcf->pdata->regulator_registered)
 
330
                pcf->pdata->regulator_registered(pcf, pdev->id);
 
331
 
 
332
        return 0;
 
333
}
 
334
 
 
335
static int __devexit pcf50633_regulator_remove(struct platform_device *pdev)
 
336
{
 
337
        struct regulator_dev *rdev = platform_get_drvdata(pdev);
 
338
 
 
339
        platform_set_drvdata(pdev, NULL);
 
340
        regulator_unregister(rdev);
 
341
 
 
342
        return 0;
 
343
}
 
344
 
 
345
static struct platform_driver pcf50633_regulator_driver = {
 
346
        .driver = {
 
347
                .name = "pcf50633-regltr",
 
348
        },
 
349
        .probe = pcf50633_regulator_probe,
 
350
        .remove = __devexit_p(pcf50633_regulator_remove),
 
351
};
 
352
 
 
353
static int __init pcf50633_regulator_init(void)
 
354
{
 
355
        return platform_driver_register(&pcf50633_regulator_driver);
 
356
}
 
357
subsys_initcall(pcf50633_regulator_init);
 
358
 
 
359
static void __exit pcf50633_regulator_exit(void)
 
360
{
 
361
        platform_driver_unregister(&pcf50633_regulator_driver);
 
362
}
 
363
module_exit(pcf50633_regulator_exit);
 
364
 
 
365
MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
 
366
MODULE_DESCRIPTION("PCF50633 regulator driver");
 
367
MODULE_LICENSE("GPL");
 
368
MODULE_ALIAS("platform:pcf50633-regulator");