regulator: Fix n_voltage settings for pcf50633 regulator
[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, _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         case PCF50633_REGULATOR_MEMLDO:
146                 volt_bits = ldo_voltage_bits(millivolts);
147                 break;
148         default:
149                 return -EINVAL;
150         }
151
152         *selector = volt_bits;
153
154         return pcf50633_reg_write(pcf, regnr, volt_bits);
155 }
156
157 static int pcf50633_regulator_voltage_value(enum pcf50633_regulator_id id,
158                                                 u8 bits)
159 {
160         int millivolts;
161
162         switch (id) {
163         case PCF50633_REGULATOR_AUTO:
164                 millivolts = auto_voltage_value(bits);
165                 break;
166         case PCF50633_REGULATOR_DOWN1:
167                 millivolts = down_voltage_value(bits);
168                 break;
169         case PCF50633_REGULATOR_DOWN2:
170                 millivolts = down_voltage_value(bits);
171                 break;
172         case PCF50633_REGULATOR_LDO1:
173         case PCF50633_REGULATOR_LDO2:
174         case PCF50633_REGULATOR_LDO3:
175         case PCF50633_REGULATOR_LDO4:
176         case PCF50633_REGULATOR_LDO5:
177         case PCF50633_REGULATOR_LDO6:
178         case PCF50633_REGULATOR_HCLDO:
179         case PCF50633_REGULATOR_MEMLDO:
180                 millivolts = ldo_voltage_value(bits);
181                 break;
182         default:
183                 return -EINVAL;
184         }
185
186         return millivolts * 1000;
187 }
188
189 static int pcf50633_regulator_get_voltage(struct regulator_dev *rdev)
190 {
191         struct pcf50633 *pcf;
192         int regulator_id;
193         u8 volt_bits, regnr;
194
195         pcf = rdev_get_drvdata(rdev);
196
197         regulator_id = rdev_get_id(rdev);
198         if (regulator_id >= PCF50633_NUM_REGULATORS)
199                 return -EINVAL;
200
201         regnr = pcf50633_regulator_registers[regulator_id];
202
203         volt_bits = pcf50633_reg_read(pcf, regnr);
204
205         return pcf50633_regulator_voltage_value(regulator_id, volt_bits);
206 }
207
208 static int pcf50633_regulator_list_voltage(struct regulator_dev *rdev,
209                                                 unsigned int index)
210 {
211         struct pcf50633 *pcf;
212         int regulator_id;
213
214         pcf = rdev_get_drvdata(rdev);
215
216         regulator_id = rdev_get_id(rdev);
217
218         switch (regulator_id) {
219         case PCF50633_REGULATOR_AUTO:
220                 index += 0x2f;
221                 break;
222         default:
223                 break;
224         }
225
226         return pcf50633_regulator_voltage_value(regulator_id, index);
227 }
228
229 static int pcf50633_regulator_enable(struct regulator_dev *rdev)
230 {
231         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
232         int regulator_id;
233         u8 regnr;
234
235         regulator_id = rdev_get_id(rdev);
236         if (regulator_id >= PCF50633_NUM_REGULATORS)
237                 return -EINVAL;
238
239         /* The *ENA register is always one after the *OUT register */
240         regnr = pcf50633_regulator_registers[regulator_id] + 1;
241
242         return pcf50633_reg_set_bit_mask(pcf, regnr, PCF50633_REGULATOR_ON,
243                                                        PCF50633_REGULATOR_ON);
244 }
245
246 static int pcf50633_regulator_disable(struct regulator_dev *rdev)
247 {
248         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
249         int regulator_id;
250         u8 regnr;
251
252         regulator_id = rdev_get_id(rdev);
253         if (regulator_id >= PCF50633_NUM_REGULATORS)
254                 return -EINVAL;
255
256         /* the *ENA register is always one after the *OUT register */
257         regnr = pcf50633_regulator_registers[regulator_id] + 1;
258
259         return pcf50633_reg_set_bit_mask(pcf, regnr,
260                                         PCF50633_REGULATOR_ON, 0);
261 }
262
263 static int pcf50633_regulator_is_enabled(struct regulator_dev *rdev)
264 {
265         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
266         int regulator_id = rdev_get_id(rdev);
267         u8 regnr;
268
269         regulator_id = rdev_get_id(rdev);
270         if (regulator_id >= PCF50633_NUM_REGULATORS)
271                 return -EINVAL;
272
273         /* the *ENA register is always one after the *OUT register */
274         regnr = pcf50633_regulator_registers[regulator_id] + 1;
275
276         return pcf50633_reg_read(pcf, regnr) & PCF50633_REGULATOR_ON;
277 }
278
279 static struct regulator_ops pcf50633_regulator_ops = {
280         .set_voltage = pcf50633_regulator_set_voltage,
281         .get_voltage = pcf50633_regulator_get_voltage,
282         .list_voltage = pcf50633_regulator_list_voltage,
283         .enable = pcf50633_regulator_enable,
284         .disable = pcf50633_regulator_disable,
285         .is_enabled = pcf50633_regulator_is_enabled,
286 };
287
288 static struct regulator_desc regulators[] = {
289         [PCF50633_REGULATOR_AUTO] =
290                 PCF50633_REGULATOR("auto", PCF50633_REGULATOR_AUTO, 81),
291         [PCF50633_REGULATOR_DOWN1] =
292                 PCF50633_REGULATOR("down1", PCF50633_REGULATOR_DOWN1, 96),
293         [PCF50633_REGULATOR_DOWN2] =
294                 PCF50633_REGULATOR("down2", PCF50633_REGULATOR_DOWN2, 96),
295         [PCF50633_REGULATOR_LDO1] =
296                 PCF50633_REGULATOR("ldo1", PCF50633_REGULATOR_LDO1, 28),
297         [PCF50633_REGULATOR_LDO2] =
298                 PCF50633_REGULATOR("ldo2", PCF50633_REGULATOR_LDO2, 28),
299         [PCF50633_REGULATOR_LDO3] =
300                 PCF50633_REGULATOR("ldo3", PCF50633_REGULATOR_LDO3, 28),
301         [PCF50633_REGULATOR_LDO4] =
302                 PCF50633_REGULATOR("ldo4", PCF50633_REGULATOR_LDO4, 28),
303         [PCF50633_REGULATOR_LDO5] =
304                 PCF50633_REGULATOR("ldo5", PCF50633_REGULATOR_LDO5, 28),
305         [PCF50633_REGULATOR_LDO6] =
306                 PCF50633_REGULATOR("ldo6", PCF50633_REGULATOR_LDO6, 28),
307         [PCF50633_REGULATOR_HCLDO] =
308                 PCF50633_REGULATOR("hcldo", PCF50633_REGULATOR_HCLDO, 28),
309         [PCF50633_REGULATOR_MEMLDO] =
310                 PCF50633_REGULATOR("memldo", PCF50633_REGULATOR_MEMLDO, 28),
311 };
312
313 static int __devinit pcf50633_regulator_probe(struct platform_device *pdev)
314 {
315         struct regulator_dev *rdev;
316         struct pcf50633 *pcf;
317
318         /* Already set by core driver */
319         pcf = dev_to_pcf50633(pdev->dev.parent);
320
321         rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
322                                   pdev->dev.platform_data, pcf, NULL);
323         if (IS_ERR(rdev))
324                 return PTR_ERR(rdev);
325
326         platform_set_drvdata(pdev, rdev);
327
328         if (pcf->pdata->regulator_registered)
329                 pcf->pdata->regulator_registered(pcf, pdev->id);
330
331         return 0;
332 }
333
334 static int __devexit pcf50633_regulator_remove(struct platform_device *pdev)
335 {
336         struct regulator_dev *rdev = platform_get_drvdata(pdev);
337
338         platform_set_drvdata(pdev, NULL);
339         regulator_unregister(rdev);
340
341         return 0;
342 }
343
344 static struct platform_driver pcf50633_regulator_driver = {
345         .driver = {
346                 .name = "pcf50633-regltr",
347         },
348         .probe = pcf50633_regulator_probe,
349         .remove = __devexit_p(pcf50633_regulator_remove),
350 };
351
352 static int __init pcf50633_regulator_init(void)
353 {
354         return platform_driver_register(&pcf50633_regulator_driver);
355 }
356 subsys_initcall(pcf50633_regulator_init);
357
358 static void __exit pcf50633_regulator_exit(void)
359 {
360         platform_driver_unregister(&pcf50633_regulator_driver);
361 }
362 module_exit(pcf50633_regulator_exit);
363
364 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
365 MODULE_DESCRIPTION("PCF50633 regulator driver");
366 MODULE_LICENSE("GPL");
367 MODULE_ALIAS("platform:pcf50633-regulator");