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linux
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) \
28 { \
29 .name = _name, \
30 .id = _id, \
31 .ops = &pcf50633_regulator_ops, \
32 .type = REGULATOR_VOLTAGE, \
33 .owner = THIS_MODULE, \
34 }
35
36static const u8 pcf50633_regulator_registers[PCF50633_NUM_REGULATORS] = {
37 [PCF50633_REGULATOR_AUTO] = PCF50633_REG_AUTOOUT,
38 [PCF50633_REGULATOR_DOWN1] = PCF50633_REG_DOWN1OUT,
39 [PCF50633_REGULATOR_DOWN2] = PCF50633_REG_DOWN2OUT,
40 [PCF50633_REGULATOR_MEMLDO] = PCF50633_REG_MEMLDOOUT,
41 [PCF50633_REGULATOR_LDO1] = PCF50633_REG_LDO1OUT,
42 [PCF50633_REGULATOR_LDO2] = PCF50633_REG_LDO2OUT,
43 [PCF50633_REGULATOR_LDO3] = PCF50633_REG_LDO3OUT,
44 [PCF50633_REGULATOR_LDO4] = PCF50633_REG_LDO4OUT,
45 [PCF50633_REGULATOR_LDO5] = PCF50633_REG_LDO5OUT,
46 [PCF50633_REGULATOR_LDO6] = PCF50633_REG_LDO6OUT,
47 [PCF50633_REGULATOR_HCLDO] = PCF50633_REG_HCLDOOUT,
48};
49
50/* Bits from voltage value */
51static u8 auto_voltage_bits(unsigned int millivolts)
52{
53 if (millivolts < 1800)
54 return 0;
55 if (millivolts > 3800)
56 return 0xff;
57
58 millivolts -= 625;
59
60 return millivolts / 25;
61}
62
63static u8 down_voltage_bits(unsigned int millivolts)
64{
65 if (millivolts < 625)
66 return 0;
67 else if (millivolts > 3000)
68 return 0xff;
69
70 millivolts -= 625;
71
72 return millivolts / 25;
73}
74
75static u8 ldo_voltage_bits(unsigned int millivolts)
76{
77 if (millivolts < 900)
78 return 0;
79 else if (millivolts > 3600)
80 return 0x1f;
81
82 millivolts -= 900;
83 return millivolts / 100;
84}
85
86/* Obtain voltage value from bits */
87static unsigned int auto_voltage_value(u8 bits)
88{
89 if (bits < 0x2f)
90 return 0;
91
92 return 625 + (bits * 25);
93}
94
95
96static unsigned int down_voltage_value(u8 bits)
97{
98 return 625 + (bits * 25);
99}
100
101
102static unsigned int ldo_voltage_value(u8 bits)
103{
104 bits &= 0x1f;
105
106 return 900 + (bits * 100);
107}
108
109static int pcf50633_regulator_set_voltage(struct regulator_dev *rdev,
110 int min_uV, int max_uV)
111{
112 struct pcf50633 *pcf;
113 int regulator_id, millivolts;
114 u8 volt_bits, regnr;
115
116 pcf = rdev_get_drvdata(rdev);
117
118 regulator_id = rdev_get_id(rdev);
119 if (regulator_id >= PCF50633_NUM_REGULATORS)
120 return -EINVAL;
121
122 millivolts = min_uV / 1000;
123
124 regnr = pcf50633_regulator_registers[regulator_id];
125
126 switch (regulator_id) {
127 case PCF50633_REGULATOR_AUTO:
128 volt_bits = auto_voltage_bits(millivolts);
129 break;
130 case PCF50633_REGULATOR_DOWN1:
131 volt_bits = down_voltage_bits(millivolts);
132 break;
133 case PCF50633_REGULATOR_DOWN2:
134 volt_bits = down_voltage_bits(millivolts);
135 break;
136 case PCF50633_REGULATOR_LDO1:
137 case PCF50633_REGULATOR_LDO2:
138 case PCF50633_REGULATOR_LDO3:
139 case PCF50633_REGULATOR_LDO4:
140 case PCF50633_REGULATOR_LDO5:
141 case PCF50633_REGULATOR_LDO6:
142 case PCF50633_REGULATOR_HCLDO:
143 volt_bits = ldo_voltage_bits(millivolts);
144 break;
145 default:
146 return -EINVAL;
147 }
148
149 return pcf50633_reg_write(pcf, regnr, volt_bits);
150}
151
152static int pcf50633_regulator_get_voltage(struct regulator_dev *rdev)
153{
154 struct pcf50633 *pcf;
155 int regulator_id, millivolts, volt_bits;
156 u8 regnr;
157
158 pcf = rdev_get_drvdata(rdev);;
159
160 regulator_id = rdev_get_id(rdev);
161 if (regulator_id >= PCF50633_NUM_REGULATORS)
162 return -EINVAL;
163
164 regnr = pcf50633_regulator_registers[regulator_id];
165
166 volt_bits = pcf50633_reg_read(pcf, regnr);
167 if (volt_bits < 0)
168 return -1;
169
170 switch (regulator_id) {
171 case PCF50633_REGULATOR_AUTO:
172 millivolts = auto_voltage_value(volt_bits);
173 break;
174 case PCF50633_REGULATOR_DOWN1:
175 millivolts = down_voltage_value(volt_bits);
176 break;
177 case PCF50633_REGULATOR_DOWN2:
178 millivolts = down_voltage_value(volt_bits);
179 break;
180 case PCF50633_REGULATOR_LDO1:
181 case PCF50633_REGULATOR_LDO2:
182 case PCF50633_REGULATOR_LDO3:
183 case PCF50633_REGULATOR_LDO4:
184 case PCF50633_REGULATOR_LDO5:
185 case PCF50633_REGULATOR_LDO6:
186 case PCF50633_REGULATOR_HCLDO:
187 millivolts = ldo_voltage_value(volt_bits);
188 break;
189 default:
190 return -EINVAL;
191 }
192
193 return millivolts * 1000;
194}
195
196static int pcf50633_regulator_enable(struct regulator_dev *rdev)
197{
198 struct pcf50633 *pcf = rdev_get_drvdata(rdev);
199 int regulator_id;
200 u8 regnr;
201
202 regulator_id = rdev_get_id(rdev);
203 if (regulator_id >= PCF50633_NUM_REGULATORS)
204 return -EINVAL;
205
206 /* The *ENA register is always one after the *OUT register */
207 regnr = pcf50633_regulator_registers[regulator_id] + 1;
208
209 return pcf50633_reg_set_bit_mask(pcf, regnr, PCF50633_REGULATOR_ON,
210 PCF50633_REGULATOR_ON);
211}
212
213static int pcf50633_regulator_disable(struct regulator_dev *rdev)
214{
215 struct pcf50633 *pcf = rdev_get_drvdata(rdev);
216 int regulator_id;
217 u8 regnr;
218
219 regulator_id = rdev_get_id(rdev);
220 if (regulator_id >= PCF50633_NUM_REGULATORS)
221 return -EINVAL;
222
223 /* the *ENA register is always one after the *OUT register */
224 regnr = pcf50633_regulator_registers[regulator_id] + 1;
225
226 return pcf50633_reg_set_bit_mask(pcf, regnr,
227 PCF50633_REGULATOR_ON, 0);
228}
229
230static int pcf50633_regulator_is_enabled(struct regulator_dev *rdev)
231{
232 struct pcf50633 *pcf = rdev_get_drvdata(rdev);
233 int regulator_id = rdev_get_id(rdev);
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_read(pcf, regnr) & PCF50633_REGULATOR_ON;
244}
245
246static struct regulator_ops pcf50633_regulator_ops = {
247 .set_voltage = pcf50633_regulator_set_voltage,
248 .get_voltage = pcf50633_regulator_get_voltage,
249 .enable = pcf50633_regulator_enable,
250 .disable = pcf50633_regulator_disable,
251 .is_enabled = pcf50633_regulator_is_enabled,
252};
253
254static struct regulator_desc regulators[] = {
255 [PCF50633_REGULATOR_AUTO] =
256 PCF50633_REGULATOR("auto", PCF50633_REGULATOR_AUTO),
257 [PCF50633_REGULATOR_DOWN1] =
258 PCF50633_REGULATOR("down1", PCF50633_REGULATOR_DOWN1),
259 [PCF50633_REGULATOR_DOWN2] =
260 PCF50633_REGULATOR("down2", PCF50633_REGULATOR_DOWN2),
261 [PCF50633_REGULATOR_LDO1] =
262 PCF50633_REGULATOR("ldo1", PCF50633_REGULATOR_LDO1),
263 [PCF50633_REGULATOR_LDO2] =
264 PCF50633_REGULATOR("ldo2", PCF50633_REGULATOR_LDO2),
265 [PCF50633_REGULATOR_LDO3] =
266 PCF50633_REGULATOR("ldo3", PCF50633_REGULATOR_LDO3),
267 [PCF50633_REGULATOR_LDO4] =
268 PCF50633_REGULATOR("ldo4", PCF50633_REGULATOR_LDO4),
269 [PCF50633_REGULATOR_LDO5] =
270 PCF50633_REGULATOR("ldo5", PCF50633_REGULATOR_LDO5),
271 [PCF50633_REGULATOR_LDO6] =
272 PCF50633_REGULATOR("ldo6", PCF50633_REGULATOR_LDO6),
273 [PCF50633_REGULATOR_HCLDO] =
274 PCF50633_REGULATOR("hcldo", PCF50633_REGULATOR_HCLDO),
275 [PCF50633_REGULATOR_MEMLDO] =
276 PCF50633_REGULATOR("memldo", PCF50633_REGULATOR_MEMLDO),
277};
278
279static int __devinit pcf50633_regulator_probe(struct platform_device *pdev)
280{
281 struct regulator_dev *rdev;
282 struct pcf50633 *pcf;
283
284 /* Already set by core driver */
285 pcf = platform_get_drvdata(pdev);
286
287 rdev = regulator_register(®ulators[pdev->id], &pdev->dev,
288 pdev->dev.platform_data, pcf);
289 if (IS_ERR(rdev))
290 return PTR_ERR(rdev);
291
292 if (pcf->pdata->regulator_registered)
293 pcf->pdata->regulator_registered(pcf, pdev->id);
294
295 return 0;
296}
297
298static int __devexit pcf50633_regulator_remove(struct platform_device *pdev)
299{
300 struct regulator_dev *rdev = platform_get_drvdata(pdev);
301
302 regulator_unregister(rdev);
303
304 return 0;
305}
306
307static struct platform_driver pcf50633_regulator_driver = {
308 .driver = {
309 .name = "pcf50633-regltr",
310 },
311 .probe = pcf50633_regulator_probe,
312 .remove = __devexit_p(pcf50633_regulator_remove),
313};
314
315static int __init pcf50633_regulator_init(void)
316{
317 return platform_driver_register(&pcf50633_regulator_driver);
318}
319module_init(pcf50633_regulator_init);
320
321static void __exit pcf50633_regulator_exit(void)
322{
323 platform_driver_unregister(&pcf50633_regulator_driver);
324}
325module_exit(pcf50633_regulator_exit);
326
327MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
328MODULE_DESCRIPTION("PCF50633 regulator driver");
329MODULE_LICENSE("GPL");
330MODULE_ALIAS("platform:pcf50633-regulator");