regulator: Move regulator drivers to subsys_initcall()
[linux-2.6.git] / 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)          \
28         {                                       \
29                 .name = _name,                  \
30                 .id = _id,                      \
31                 .ops = &pcf50633_regulator_ops, \
32                 .type = REGULATOR_VOLTAGE,      \
33                 .owner = THIS_MODULE,           \
34         }
35
36 static 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 */
51 static 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
63 static 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
75 static 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 */
87 static unsigned int auto_voltage_value(u8 bits)
88 {
89         if (bits < 0x2f)
90                 return 0;
91
92         return 625 + (bits * 25);
93 }
94
95
96 static unsigned int down_voltage_value(u8 bits)
97 {
98         return 625 + (bits * 25);
99 }
100
101
102 static unsigned int ldo_voltage_value(u8 bits)
103 {
104         bits &= 0x1f;
105
106         return 900 + (bits * 100);
107 }
108
109 static 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
152 static 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
196 static 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
213 static 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
230 static 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
246 static 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
254 static 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
279 static 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(&regulators[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
298 static 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
307 static 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
315 static int __init pcf50633_regulator_init(void)
316 {
317         return platform_driver_register(&pcf50633_regulator_driver);
318 }
319 subsys_initcall(pcf50633_regulator_init);
320
321 static void __exit pcf50633_regulator_exit(void)
322 {
323         platform_driver_unregister(&pcf50633_regulator_driver);
324 }
325 module_exit(pcf50633_regulator_exit);
326
327 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
328 MODULE_DESCRIPTION("PCF50633 regulator driver");
329 MODULE_LICENSE("GPL");
330 MODULE_ALIAS("platform:pcf50633-regulator");