parport_pc: show the detection of a 2 serial port ITE8874 chip
[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 {
113         struct pcf50633 *pcf;
114         int regulator_id, millivolts;
115         u8 volt_bits, regnr;
116
117         pcf = rdev_get_drvdata(rdev);
118
119         regulator_id = rdev_get_id(rdev);
120         if (regulator_id >= PCF50633_NUM_REGULATORS)
121                 return -EINVAL;
122
123         millivolts = min_uV / 1000;
124
125         regnr = pcf50633_regulator_registers[regulator_id];
126
127         switch (regulator_id) {
128         case PCF50633_REGULATOR_AUTO:
129                 volt_bits = auto_voltage_bits(millivolts);
130                 break;
131         case PCF50633_REGULATOR_DOWN1:
132                 volt_bits = down_voltage_bits(millivolts);
133                 break;
134         case PCF50633_REGULATOR_DOWN2:
135                 volt_bits = down_voltage_bits(millivolts);
136                 break;
137         case PCF50633_REGULATOR_LDO1:
138         case PCF50633_REGULATOR_LDO2:
139         case PCF50633_REGULATOR_LDO3:
140         case PCF50633_REGULATOR_LDO4:
141         case PCF50633_REGULATOR_LDO5:
142         case PCF50633_REGULATOR_LDO6:
143         case PCF50633_REGULATOR_HCLDO:
144                 volt_bits = ldo_voltage_bits(millivolts);
145                 break;
146         default:
147                 return -EINVAL;
148         }
149
150         return pcf50633_reg_write(pcf, regnr, volt_bits);
151 }
152
153 static int pcf50633_regulator_voltage_value(enum pcf50633_regulator_id id,
154                                                 u8 bits)
155 {
156         int millivolts;
157
158         switch (id) {
159         case PCF50633_REGULATOR_AUTO:
160                 millivolts = auto_voltage_value(bits);
161                 break;
162         case PCF50633_REGULATOR_DOWN1:
163                 millivolts = down_voltage_value(bits);
164                 break;
165         case PCF50633_REGULATOR_DOWN2:
166                 millivolts = down_voltage_value(bits);
167                 break;
168         case PCF50633_REGULATOR_LDO1:
169         case PCF50633_REGULATOR_LDO2:
170         case PCF50633_REGULATOR_LDO3:
171         case PCF50633_REGULATOR_LDO4:
172         case PCF50633_REGULATOR_LDO5:
173         case PCF50633_REGULATOR_LDO6:
174         case PCF50633_REGULATOR_HCLDO:
175                 millivolts = ldo_voltage_value(bits);
176                 break;
177         default:
178                 return -EINVAL;
179         }
180
181         return millivolts * 1000;
182 }
183
184 static int pcf50633_regulator_get_voltage(struct regulator_dev *rdev)
185 {
186         struct pcf50633 *pcf;
187         int regulator_id;
188         u8 volt_bits, regnr;
189
190         pcf = rdev_get_drvdata(rdev);
191
192         regulator_id = rdev_get_id(rdev);
193         if (regulator_id >= PCF50633_NUM_REGULATORS)
194                 return -EINVAL;
195
196         regnr = pcf50633_regulator_registers[regulator_id];
197
198         volt_bits = pcf50633_reg_read(pcf, regnr);
199
200         return pcf50633_regulator_voltage_value(regulator_id, volt_bits);
201 }
202
203 static int pcf50633_regulator_list_voltage(struct regulator_dev *rdev,
204                                                 unsigned int index)
205 {
206         struct pcf50633 *pcf;
207         int regulator_id;
208
209         pcf = rdev_get_drvdata(rdev);
210
211         regulator_id = rdev_get_id(rdev);
212
213         switch (regulator_id) {
214         case PCF50633_REGULATOR_AUTO:
215                 index += 0x2f;
216                 break;
217         case PCF50633_REGULATOR_HCLDO:
218                 index += 0x01;
219                 break;
220         default:
221                 break;
222         }
223
224         return pcf50633_regulator_voltage_value(regulator_id, index);
225 }
226
227 static int pcf50633_regulator_enable(struct regulator_dev *rdev)
228 {
229         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
230         int regulator_id;
231         u8 regnr;
232
233         regulator_id = rdev_get_id(rdev);
234         if (regulator_id >= PCF50633_NUM_REGULATORS)
235                 return -EINVAL;
236
237         /* The *ENA register is always one after the *OUT register */
238         regnr = pcf50633_regulator_registers[regulator_id] + 1;
239
240         return pcf50633_reg_set_bit_mask(pcf, regnr, PCF50633_REGULATOR_ON,
241                                                        PCF50633_REGULATOR_ON);
242 }
243
244 static int pcf50633_regulator_disable(struct regulator_dev *rdev)
245 {
246         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
247         int regulator_id;
248         u8 regnr;
249
250         regulator_id = rdev_get_id(rdev);
251         if (regulator_id >= PCF50633_NUM_REGULATORS)
252                 return -EINVAL;
253
254         /* the *ENA register is always one after the *OUT register */
255         regnr = pcf50633_regulator_registers[regulator_id] + 1;
256
257         return pcf50633_reg_set_bit_mask(pcf, regnr,
258                                         PCF50633_REGULATOR_ON, 0);
259 }
260
261 static int pcf50633_regulator_is_enabled(struct regulator_dev *rdev)
262 {
263         struct pcf50633 *pcf = rdev_get_drvdata(rdev);
264         int regulator_id = rdev_get_id(rdev);
265         u8 regnr;
266
267         regulator_id = rdev_get_id(rdev);
268         if (regulator_id >= PCF50633_NUM_REGULATORS)
269                 return -EINVAL;
270
271         /* the *ENA register is always one after the *OUT register */
272         regnr = pcf50633_regulator_registers[regulator_id] + 1;
273
274         return pcf50633_reg_read(pcf, regnr) & PCF50633_REGULATOR_ON;
275 }
276
277 static struct regulator_ops pcf50633_regulator_ops = {
278         .set_voltage = pcf50633_regulator_set_voltage,
279         .get_voltage = pcf50633_regulator_get_voltage,
280         .list_voltage = pcf50633_regulator_list_voltage,
281         .enable = pcf50633_regulator_enable,
282         .disable = pcf50633_regulator_disable,
283         .is_enabled = pcf50633_regulator_is_enabled,
284 };
285
286 static struct regulator_desc regulators[] = {
287         [PCF50633_REGULATOR_AUTO] =
288                 PCF50633_REGULATOR("auto", PCF50633_REGULATOR_AUTO, 80),
289         [PCF50633_REGULATOR_DOWN1] =
290                 PCF50633_REGULATOR("down1", PCF50633_REGULATOR_DOWN1, 95),
291         [PCF50633_REGULATOR_DOWN2] =
292                 PCF50633_REGULATOR("down2", PCF50633_REGULATOR_DOWN2, 95),
293         [PCF50633_REGULATOR_LDO1] =
294                 PCF50633_REGULATOR("ldo1", PCF50633_REGULATOR_LDO1, 27),
295         [PCF50633_REGULATOR_LDO2] =
296                 PCF50633_REGULATOR("ldo2", PCF50633_REGULATOR_LDO2, 27),
297         [PCF50633_REGULATOR_LDO3] =
298                 PCF50633_REGULATOR("ldo3", PCF50633_REGULATOR_LDO3, 27),
299         [PCF50633_REGULATOR_LDO4] =
300                 PCF50633_REGULATOR("ldo4", PCF50633_REGULATOR_LDO4, 27),
301         [PCF50633_REGULATOR_LDO5] =
302                 PCF50633_REGULATOR("ldo5", PCF50633_REGULATOR_LDO5, 27),
303         [PCF50633_REGULATOR_LDO6] =
304                 PCF50633_REGULATOR("ldo6", PCF50633_REGULATOR_LDO6, 27),
305         [PCF50633_REGULATOR_HCLDO] =
306                 PCF50633_REGULATOR("hcldo", PCF50633_REGULATOR_HCLDO, 26),
307         [PCF50633_REGULATOR_MEMLDO] =
308                 PCF50633_REGULATOR("memldo", PCF50633_REGULATOR_MEMLDO, 0),
309 };
310
311 static int __devinit pcf50633_regulator_probe(struct platform_device *pdev)
312 {
313         struct regulator_dev *rdev;
314         struct pcf50633 *pcf;
315
316         /* Already set by core driver */
317         pcf = dev_to_pcf50633(pdev->dev.parent);
318
319         rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
320                                   pdev->dev.platform_data, pcf);
321         if (IS_ERR(rdev))
322                 return PTR_ERR(rdev);
323
324         platform_set_drvdata(pdev, rdev);
325
326         if (pcf->pdata->regulator_registered)
327                 pcf->pdata->regulator_registered(pcf, pdev->id);
328
329         return 0;
330 }
331
332 static int __devexit pcf50633_regulator_remove(struct platform_device *pdev)
333 {
334         struct regulator_dev *rdev = platform_get_drvdata(pdev);
335
336         platform_set_drvdata(pdev, NULL);
337         regulator_unregister(rdev);
338
339         return 0;
340 }
341
342 static struct platform_driver pcf50633_regulator_driver = {
343         .driver = {
344                 .name = "pcf50633-regltr",
345         },
346         .probe = pcf50633_regulator_probe,
347         .remove = __devexit_p(pcf50633_regulator_remove),
348 };
349
350 static int __init pcf50633_regulator_init(void)
351 {
352         return platform_driver_register(&pcf50633_regulator_driver);
353 }
354 subsys_initcall(pcf50633_regulator_init);
355
356 static void __exit pcf50633_regulator_exit(void)
357 {
358         platform_driver_unregister(&pcf50633_regulator_driver);
359 }
360 module_exit(pcf50633_regulator_exit);
361
362 MODULE_AUTHOR("Balaji Rao <balajirrao@openmoko.org>");
363 MODULE_DESCRIPTION("PCF50633 regulator driver");
364 MODULE_LICENSE("GPL");
365 MODULE_ALIAS("platform:pcf50633-regulator");