parport_pc: show the detection of a 2 serial port ITE8874 chip
[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(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 wm8400_ldo_list_voltage(dev, val);
67 }
68
69 static int wm8400_ldo_set_voltage(struct regulator_dev *dev,
70                                   int min_uV, int max_uV)
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         return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
97                                WM8400_LDO1_VSEL_MASK, val);
98 }
99
100 static struct regulator_ops wm8400_ldo_ops = {
101         .is_enabled = wm8400_ldo_is_enabled,
102         .enable = wm8400_ldo_enable,
103         .disable = wm8400_ldo_disable,
104         .list_voltage = wm8400_ldo_list_voltage,
105         .get_voltage = wm8400_ldo_get_voltage,
106         .set_voltage = wm8400_ldo_set_voltage,
107 };
108
109 static int wm8400_dcdc_is_enabled(struct regulator_dev *dev)
110 {
111         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
112         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
113         u16 val;
114
115         val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
116         return (val & WM8400_DC1_ENA) != 0;
117 }
118
119 static int wm8400_dcdc_enable(struct regulator_dev *dev)
120 {
121         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
122         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
123
124         return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
125                                WM8400_DC1_ENA, WM8400_DC1_ENA);
126 }
127
128 static int wm8400_dcdc_disable(struct regulator_dev *dev)
129 {
130         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
131         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
132
133         return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
134                                WM8400_DC1_ENA, 0);
135 }
136
137 static int wm8400_dcdc_list_voltage(struct regulator_dev *dev,
138                                     unsigned selector)
139 {
140         if (selector > WM8400_DC1_VSEL_MASK)
141                 return -EINVAL;
142
143         return 850000 + (selector * 25000);
144 }
145
146 static int wm8400_dcdc_get_voltage(struct regulator_dev *dev)
147 {
148         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
149         u16 val;
150         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
151
152         val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
153         val &= WM8400_DC1_VSEL_MASK;
154
155         return 850000 + (25000 * val);
156 }
157
158 static int wm8400_dcdc_set_voltage(struct regulator_dev *dev,
159                                   int min_uV, int max_uV)
160 {
161         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
162         u16 val;
163         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
164
165         if (min_uV < 850000)
166                 return -EINVAL;
167
168         val = (min_uV - 825001) / 25000;
169
170         if (850000 + (25000 * val) > max_uV)
171                 return -EINVAL;
172         BUG_ON(850000 + (25000 * val) < min_uV);
173
174         return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
175                                WM8400_DC1_VSEL_MASK, val);
176 }
177
178 static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
179 {
180         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
181         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
182         u16 data[2];
183         int ret;
184
185         ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
186                                 data);
187         if (ret != 0)
188                 return 0;
189
190         /* Datasheet: hibernate */
191         if (data[0] & WM8400_DC1_SLEEP)
192                 return REGULATOR_MODE_STANDBY;
193
194         /* Datasheet: standby */
195         if (!(data[0] & WM8400_DC1_ACTIVE))
196                 return REGULATOR_MODE_IDLE;
197
198         /* Datasheet: active with or without force PWM */
199         if (data[1] & WM8400_DC1_FRC_PWM)
200                 return REGULATOR_MODE_FAST;
201         else
202                 return REGULATOR_MODE_NORMAL;
203 }
204
205 static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
206 {
207         struct wm8400 *wm8400 = rdev_get_drvdata(dev);
208         int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
209         int ret;
210
211         switch (mode) {
212         case REGULATOR_MODE_FAST:
213                 /* Datasheet: active with force PWM */
214                 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
215                                       WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
216                 if (ret != 0)
217                         return ret;
218
219                 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
220                                        WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
221                                        WM8400_DC1_ACTIVE);
222
223         case REGULATOR_MODE_NORMAL:
224                 /* Datasheet: active */
225                 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
226                                       WM8400_DC1_FRC_PWM, 0);
227                 if (ret != 0)
228                         return ret;
229
230                 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
231                                        WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
232                                        WM8400_DC1_ACTIVE);
233
234         case REGULATOR_MODE_IDLE:
235                 /* Datasheet: standby */
236                 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
237                                       WM8400_DC1_ACTIVE, 0);
238                 if (ret != 0)
239                         return ret;
240                 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
241                                        WM8400_DC1_SLEEP, 0);
242
243         default:
244                 return -EINVAL;
245         }
246 }
247
248 static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
249                                                  int input_uV, int output_uV,
250                                                  int load_uA)
251 {
252         return REGULATOR_MODE_NORMAL;
253 }
254
255 static struct regulator_ops wm8400_dcdc_ops = {
256         .is_enabled = wm8400_dcdc_is_enabled,
257         .enable = wm8400_dcdc_enable,
258         .disable = wm8400_dcdc_disable,
259         .list_voltage = wm8400_dcdc_list_voltage,
260         .get_voltage = wm8400_dcdc_get_voltage,
261         .set_voltage = wm8400_dcdc_set_voltage,
262         .get_mode = wm8400_dcdc_get_mode,
263         .set_mode = wm8400_dcdc_set_mode,
264         .get_optimum_mode = wm8400_dcdc_get_optimum_mode,
265 };
266
267 static struct regulator_desc regulators[] = {
268         {
269                 .name = "LDO1",
270                 .id = WM8400_LDO1,
271                 .ops = &wm8400_ldo_ops,
272                 .n_voltages = WM8400_LDO1_VSEL_MASK + 1,
273                 .type = REGULATOR_VOLTAGE,
274                 .owner = THIS_MODULE,
275         },
276         {
277                 .name = "LDO2",
278                 .id = WM8400_LDO2,
279                 .ops = &wm8400_ldo_ops,
280                 .n_voltages = WM8400_LDO2_VSEL_MASK + 1,
281                 .type = REGULATOR_VOLTAGE,
282                 .owner = THIS_MODULE,
283         },
284         {
285                 .name = "LDO3",
286                 .id = WM8400_LDO3,
287                 .ops = &wm8400_ldo_ops,
288                 .n_voltages = WM8400_LDO3_VSEL_MASK + 1,
289                 .type = REGULATOR_VOLTAGE,
290                 .owner = THIS_MODULE,
291         },
292         {
293                 .name = "LDO4",
294                 .id = WM8400_LDO4,
295                 .ops = &wm8400_ldo_ops,
296                 .n_voltages = WM8400_LDO4_VSEL_MASK + 1,
297                 .type = REGULATOR_VOLTAGE,
298                 .owner = THIS_MODULE,
299         },
300         {
301                 .name = "DCDC1",
302                 .id = WM8400_DCDC1,
303                 .ops = &wm8400_dcdc_ops,
304                 .n_voltages = WM8400_DC1_VSEL_MASK + 1,
305                 .type = REGULATOR_VOLTAGE,
306                 .owner = THIS_MODULE,
307         },
308         {
309                 .name = "DCDC2",
310                 .id = WM8400_DCDC2,
311                 .ops = &wm8400_dcdc_ops,
312                 .n_voltages = WM8400_DC2_VSEL_MASK + 1,
313                 .type = REGULATOR_VOLTAGE,
314                 .owner = THIS_MODULE,
315         },
316 };
317
318 static int __devinit wm8400_regulator_probe(struct platform_device *pdev)
319 {
320         struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
321         struct regulator_dev *rdev;
322
323         rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
324                                   pdev->dev.platform_data, wm8400);
325
326         if (IS_ERR(rdev))
327                 return PTR_ERR(rdev);
328
329         platform_set_drvdata(pdev, rdev);
330
331         return 0;
332 }
333
334 static int __devexit wm8400_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 wm8400_regulator_driver = {
345         .driver = {
346                 .name = "wm8400-regulator",
347         },
348         .probe = wm8400_regulator_probe,
349         .remove = __devexit_p(wm8400_regulator_remove),
350 };
351
352 /**
353  * wm8400_register_regulator - enable software control of a WM8400 regulator
354  *
355  * This function enables software control of a WM8400 regulator via
356  * the regulator API.  It is intended to be called from the
357  * platform_init() callback of the WM8400 MFD driver.
358  *
359  * @param dev      The WM8400 device to operate on.
360  * @param reg      The regulator to control.
361  * @param initdata Regulator initdata for the regulator.
362  */
363 int wm8400_register_regulator(struct device *dev, int reg,
364                               struct regulator_init_data *initdata)
365 {
366         struct wm8400 *wm8400 = dev_get_drvdata(dev);
367
368         if (wm8400->regulators[reg].name)
369                 return -EBUSY;
370
371         initdata->driver_data = wm8400;
372
373         wm8400->regulators[reg].name = "wm8400-regulator";
374         wm8400->regulators[reg].id = reg;
375         wm8400->regulators[reg].dev.parent = dev;
376         wm8400->regulators[reg].dev.platform_data = initdata;
377
378         return platform_device_register(&wm8400->regulators[reg]);
379 }
380 EXPORT_SYMBOL_GPL(wm8400_register_regulator);
381
382 static int __init wm8400_regulator_init(void)
383 {
384         return platform_driver_register(&wm8400_regulator_driver);
385 }
386 subsys_initcall(wm8400_regulator_init);
387
388 static void __exit wm8400_regulator_exit(void)
389 {
390         platform_driver_unregister(&wm8400_regulator_driver);
391 }
392 module_exit(wm8400_regulator_exit);
393
394 MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
395 MODULE_DESCRIPTION("WM8400 regulator driver");
396 MODULE_LICENSE("GPL");
397 MODULE_ALIAS("platform:wm8400-regulator");