arch: arm: regulator: Fix LDK kernel build break
[linux-2.6.git] / drivers / regulator / wm8400-regulator.c
1 /*
2  * Regulator support for WM8400
3  *
4  * Copyright 2008 Wolfson Microelectronics PLC.
5  *
6  * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7  *
8  * This program is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU General Public License as
10  * published by the Free Software Foundation; either version 2 of the
11  * License, or (at your option) any later version.
12  *
13  */
14
15 #include <linux/bug.h>
16 #include <linux/err.h>
17 #include <linux/kernel.h>
18 #include <linux/regulator/driver.h>
19 #include <linux/mfd/wm8400-private.h>
20
21 static int wm8400_ldo_is_enabled(struct regulator_dev *dev)
22 {
23         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
24         u16 val;
25
26         val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev));
27         return (val & WM8400_LDO1_ENA) != 0;
28 }
29
30 static int wm8400_ldo_enable(struct regulator_dev *dev)
31 {
32         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
33
34         return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
35                                WM8400_LDO1_ENA, WM8400_LDO1_ENA);
36 }
37
38 static int wm8400_ldo_disable(struct regulator_dev *dev)
39 {
40         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
41
42         return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
43                                WM8400_LDO1_ENA, 0);
44 }
45
46 static int wm8400_ldo_list_voltage(struct regulator_dev *dev,
47                                    unsigned selector)
48 {
49         if (selector > WM8400_LDO1_VSEL_MASK)
50                 return -EINVAL;
51
52         if (selector < 15)
53                 return 900000 + (selector * 50000);
54         else
55                 return 1600000 + ((selector - 14) * 100000);
56 }
57
58 static int wm8400_ldo_get_voltage_sel(struct regulator_dev *dev)
59 {
60         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
61         u16 val;
62
63         val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev));
64         val &= WM8400_LDO1_VSEL_MASK;
65
66         return val;
67 }
68
69 static int wm8400_ldo_set_voltage(struct regulator_dev *dev,
70                                   int min_uV, int max_uV, unsigned *selector)
71 {
72         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
73         u16 val;
74
75         if (min_uV < 900000 || min_uV > 3300000)
76                 return -EINVAL;
77
78         if (min_uV < 1700000) {
79                 /* Steps of 50mV from 900mV;  */
80                 val = (min_uV - 850001) / 50000;
81
82                 if ((val * 50000) + 900000 > max_uV)
83                         return -EINVAL;
84                 BUG_ON((val * 50000) + 900000 < min_uV);
85         } else {
86                 /* Steps of 100mV from 1700mV */
87                 val = ((min_uV - 1600001) / 100000);
88
89                 if ((val * 100000) + 1700000 > max_uV)
90                         return -EINVAL;
91                 BUG_ON((val * 100000) + 1700000 < min_uV);
92
93                 val += 0xf;
94         }
95
96         *selector = val;
97
98         return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
99                                WM8400_LDO1_VSEL_MASK, val);
100 }
101
102 static struct regulator_ops wm8400_ldo_ops = {
103         .is_enabled = wm8400_ldo_is_enabled,
104         .enable = wm8400_ldo_enable,
105         .disable = wm8400_ldo_disable,
106         .list_voltage = wm8400_ldo_list_voltage,
107         .get_voltage_sel = wm8400_ldo_get_voltage_sel,
108         .set_voltage = wm8400_ldo_set_voltage,
109 };
110
111 static int wm8400_dcdc_is_enabled(struct regulator_dev *dev)
112 {
113         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
114         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
115         u16 val;
116
117         val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
118         return (val & WM8400_DC1_ENA) != 0;
119 }
120
121 static int wm8400_dcdc_enable(struct regulator_dev *dev)
122 {
123         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
124         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
125
126         return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
127                                WM8400_DC1_ENA, WM8400_DC1_ENA);
128 }
129
130 static int wm8400_dcdc_disable(struct regulator_dev *dev)
131 {
132         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
133         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
134
135         return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
136                                WM8400_DC1_ENA, 0);
137 }
138
139 static int wm8400_dcdc_list_voltage(struct regulator_dev *dev,
140                                     unsigned selector)
141 {
142         if (selector > WM8400_DC1_VSEL_MASK)
143                 return -EINVAL;
144
145         return 850000 + (selector * 25000);
146 }
147
148 static int wm8400_dcdc_get_voltage_sel(struct regulator_dev *dev)
149 {
150         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
151         u16 val;
152         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
153
154         val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
155         val &= WM8400_DC1_VSEL_MASK;
156
157         return val;
158 }
159
160 static int wm8400_dcdc_set_voltage(struct regulator_dev *dev,
161                                    int min_uV, int max_uV, unsigned *selector)
162 {
163         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
164         u16 val;
165         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
166
167         if (min_uV < 850000)
168                 return -EINVAL;
169
170         val = (min_uV - 825001) / 25000;
171
172         if (850000 + (25000 * val) > max_uV)
173                 return -EINVAL;
174         BUG_ON(850000 + (25000 * val) < min_uV);
175
176         *selector = val;
177
178         return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
179                                WM8400_DC1_VSEL_MASK, val);
180 }
181
182 static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
183 {
184         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
185         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
186         u16 data[2];
187         int ret;
188
189         ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
190                                 data);
191         if (ret != 0)
192                 return 0;
193
194         /* Datasheet: hibernate */
195         if (data[0] & WM8400_DC1_SLEEP)
196                 return REGULATOR_MODE_STANDBY;
197
198         /* Datasheet: standby */
199         if (!(data[0] & WM8400_DC1_ACTIVE))
200                 return REGULATOR_MODE_IDLE;
201
202         /* Datasheet: active with or without force PWM */
203         if (data[1] & WM8400_DC1_FRC_PWM)
204                 return REGULATOR_MODE_FAST;
205         else
206                 return REGULATOR_MODE_NORMAL;
207 }
208
209 static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
210 {
211         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
212         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
213         int ret;
214
215         switch (mode) {
216         case REGULATOR_MODE_FAST:
217                 /* Datasheet: active with force PWM */
218                 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
219                                       WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
220                 if (ret != 0)
221                         return ret;
222
223                 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
224                                        WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
225                                        WM8400_DC1_ACTIVE);
226
227         case REGULATOR_MODE_NORMAL:
228                 /* Datasheet: active */
229                 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
230                                       WM8400_DC1_FRC_PWM, 0);
231                 if (ret != 0)
232                         return ret;
233
234                 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
235                                        WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
236                                        WM8400_DC1_ACTIVE);
237
238         case REGULATOR_MODE_IDLE:
239                 /* Datasheet: standby */
240                 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
241                                       WM8400_DC1_ACTIVE, 0);
242                 if (ret != 0)
243                         return ret;
244                 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
245                                        WM8400_DC1_SLEEP, 0);
246
247         default:
248                 return -EINVAL;
249         }
250 }
251
252 static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
253                                                  int input_uV, int output_uV,
254                                                  int load_uA)
255 {
256         return REGULATOR_MODE_NORMAL;
257 }
258
259 static struct regulator_ops wm8400_dcdc_ops = {
260         .is_enabled = wm8400_dcdc_is_enabled,
261         .enable = wm8400_dcdc_enable,
262         .disable = wm8400_dcdc_disable,
263         .list_voltage = wm8400_dcdc_list_voltage,
264         .get_voltage_sel = wm8400_dcdc_get_voltage_sel,
265         .set_voltage = wm8400_dcdc_set_voltage,
266         .get_mode = wm8400_dcdc_get_mode,
267         .set_mode = wm8400_dcdc_set_mode,
268         .get_optimum_mode = wm8400_dcdc_get_optimum_mode,
269 };
270
271 static struct regulator_desc regulators[] = {
272         {
273                 .name = "LDO1",
274                 .id = WM8400_LDO1,
275                 .ops = &wm8400_ldo_ops,
276                 .n_voltages = WM8400_LDO1_VSEL_MASK + 1,
277                 .type = REGULATOR_VOLTAGE,
278                 .owner = THIS_MODULE,
279         },
280         {
281                 .name = "LDO2",
282                 .id = WM8400_LDO2,
283                 .ops = &wm8400_ldo_ops,
284                 .n_voltages = WM8400_LDO2_VSEL_MASK + 1,
285                 .type = REGULATOR_VOLTAGE,
286                 .owner = THIS_MODULE,
287         },
288         {
289                 .name = "LDO3",
290                 .id = WM8400_LDO3,
291                 .ops = &wm8400_ldo_ops,
292                 .n_voltages = WM8400_LDO3_VSEL_MASK + 1,
293                 .type = REGULATOR_VOLTAGE,
294                 .owner = THIS_MODULE,
295         },
296         {
297                 .name = "LDO4",
298                 .id = WM8400_LDO4,
299                 .ops = &wm8400_ldo_ops,
300                 .n_voltages = WM8400_LDO4_VSEL_MASK + 1,
301                 .type = REGULATOR_VOLTAGE,
302                 .owner = THIS_MODULE,
303         },
304         {
305                 .name = "DCDC1",
306                 .id = WM8400_DCDC1,
307                 .ops = &wm8400_dcdc_ops,
308                 .n_voltages = WM8400_DC1_VSEL_MASK + 1,
309                 .type = REGULATOR_VOLTAGE,
310                 .owner = THIS_MODULE,
311         },
312         {
313                 .name = "DCDC2",
314                 .id = WM8400_DCDC2,
315                 .ops = &wm8400_dcdc_ops,
316                 .n_voltages = WM8400_DC2_VSEL_MASK + 1,
317                 .type = REGULATOR_VOLTAGE,
318                 .owner = THIS_MODULE,
319         },
320 };
321
322 static int __devinit wm8400_regulator_probe(struct platform_device *pdev)
323 {
324         struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
325         struct regulator_dev *rdev;
326
327         rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
328                                   pdev->dev.platform_data, wm8400);
329
330         if (IS_ERR(rdev))
331                 return PTR_ERR(rdev);
332
333         platform_set_drvdata(pdev, rdev);
334
335         return 0;
336 }
337
338 static int __devexit wm8400_regulator_remove(struct platform_device *pdev)
339 {
340         struct regulator_dev *rdev = platform_get_drvdata(pdev);
341
342         platform_set_drvdata(pdev, NULL);
343         regulator_unregister(rdev);
344
345         return 0;
346 }
347
348 static struct platform_driver wm8400_regulator_driver = {
349         .driver = {
350                 .name = "wm8400-regulator",
351         },
352         .probe = wm8400_regulator_probe,
353         .remove = __devexit_p(wm8400_regulator_remove),
354 };
355
356 /**
357  * wm8400_register_regulator - enable software control of a WM8400 regulator
358  *
359  * This function enables software control of a WM8400 regulator via
360  * the regulator API.  It is intended to be called from the
361  * platform_init() callback of the WM8400 MFD driver.
362  *
363  * @param dev      The WM8400 device to operate on.
364  * @param reg      The regulator to control.
365  * @param initdata Regulator initdata for the regulator.
366  */
367 int wm8400_register_regulator(struct device *dev, int reg,
368                               struct regulator_init_data *initdata)
369 {
370         struct wm8400 *wm8400 = dev_get_drvdata(dev);
371
372         if (wm8400->regulators[reg].name)
373                 return -EBUSY;
374
375         initdata->driver_data = wm8400;
376
377         wm8400->regulators[reg].name = "wm8400-regulator";
378         wm8400->regulators[reg].id = reg;
379         wm8400->regulators[reg].dev.parent = dev;
380         wm8400->regulators[reg].dev.platform_data = initdata;
381
382         return platform_device_register(&wm8400->regulators[reg]);
383 }
384 EXPORT_SYMBOL_GPL(wm8400_register_regulator);
385
386 static int __init wm8400_regulator_init(void)
387 {
388         return platform_driver_register(&wm8400_regulator_driver);
389 }
390 subsys_initcall(wm8400_regulator_init);
391
392 static void __exit wm8400_regulator_exit(void)
393 {
394         platform_driver_unregister(&wm8400_regulator_driver);
395 }
396 module_exit(wm8400_regulator_exit);
397
398 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
399 MODULE_DESCRIPTION("WM8400 regulator driver");
400 MODULE_LICENSE("GPL");
401 MODULE_ALIAS("platform:wm8400-regulator");