blob: 56e23d44ba591383696ec9382a1a3c4b05ae32a9 [file] [log] [blame]
Mark Brown42fad572008-09-11 11:12:01 +01001/*
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
21static 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
30static 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
38static 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
46static int wm8400_ldo_get_voltage(struct regulator_dev *dev)
47{
48 struct wm8400 *wm8400 = rdev_get_drvdata(dev);
49 u16 val;
50
51 val = wm8400_reg_read(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev));
52 val &= WM8400_LDO1_VSEL_MASK;
53
54 if (val < 15)
55 return 900000 + (val * 50000);
56 else
57 return 1600000 + ((val - 14) * 100000);
58}
59
60static int wm8400_ldo_set_voltage(struct regulator_dev *dev,
61 int min_uV, int max_uV)
62{
63 struct wm8400 *wm8400 = rdev_get_drvdata(dev);
64 u16 val;
65
66 if (min_uV < 900000 || min_uV > 3300000)
67 return -EINVAL;
68
69 if (min_uV < 1700000) {
70 /* Steps of 50mV from 900mV; */
71 val = (min_uV - 850001) / 50000;
72
73 if ((val * 50000) + 900000 > max_uV)
74 return -EINVAL;
75 BUG_ON((val * 50000) + 900000 < min_uV);
76 } else {
77 /* Steps of 100mV from 1700mV */
78 val = ((min_uV - 1600001) / 100000);
79
80 if ((val * 100000) + 1700000 > max_uV)
81 return -EINVAL;
82 BUG_ON((val * 100000) + 1700000 < min_uV);
83
84 val += 0xf;
85 }
86
87 return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
88 WM8400_LDO1_VSEL_MASK, val);
89}
90
91static struct regulator_ops wm8400_ldo_ops = {
92 .is_enabled = wm8400_ldo_is_enabled,
93 .enable = wm8400_ldo_enable,
94 .disable = wm8400_ldo_disable,
95 .get_voltage = wm8400_ldo_get_voltage,
96 .set_voltage = wm8400_ldo_set_voltage,
97};
98
99static int wm8400_dcdc_is_enabled(struct regulator_dev *dev)
100{
101 struct wm8400 *wm8400 = rdev_get_drvdata(dev);
102 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
103 u16 val;
104
105 val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
106 return (val & WM8400_DC1_ENA) != 0;
107}
108
109static int wm8400_dcdc_enable(struct regulator_dev *dev)
110{
111 struct wm8400 *wm8400 = rdev_get_drvdata(dev);
112 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
113
114 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
115 WM8400_DC1_ENA, WM8400_DC1_ENA);
116}
117
118static int wm8400_dcdc_disable(struct regulator_dev *dev)
119{
120 struct wm8400 *wm8400 = rdev_get_drvdata(dev);
121 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
122
123 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
124 WM8400_DC1_ENA, 0);
125}
126
127static int wm8400_dcdc_get_voltage(struct regulator_dev *dev)
128{
129 struct wm8400 *wm8400 = rdev_get_drvdata(dev);
130 u16 val;
131 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
132
133 val = wm8400_reg_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset);
134 val &= WM8400_DC1_VSEL_MASK;
135
136 return 850000 + (25000 * val);
137}
138
139static int wm8400_dcdc_set_voltage(struct regulator_dev *dev,
140 int min_uV, int max_uV)
141{
142 struct wm8400 *wm8400 = rdev_get_drvdata(dev);
143 u16 val;
144 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
145
146 if (min_uV < 850000)
147 return -EINVAL;
148
149 val = (min_uV - 825001) / 25000;
150
151 if (850000 + (25000 * val) > max_uV)
152 return -EINVAL;
153 BUG_ON(850000 + (25000 * val) < min_uV);
154
155 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
156 WM8400_DC1_VSEL_MASK, val);
157}
158
159static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
160{
161 struct wm8400 *wm8400 = rdev_get_drvdata(dev);
162 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
163 u16 data[2];
164 int ret;
165
166 ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
167 data);
168 if (ret != 0)
169 return 0;
170
171 /* Datasheet: hibernate */
172 if (data[0] & WM8400_DC1_SLEEP)
173 return REGULATOR_MODE_STANDBY;
174
175 /* Datasheet: standby */
176 if (!(data[0] & WM8400_DC1_ACTIVE))
177 return REGULATOR_MODE_IDLE;
178
179 /* Datasheet: active with or without force PWM */
180 if (data[1] & WM8400_DC1_FRC_PWM)
181 return REGULATOR_MODE_FAST;
182 else
183 return REGULATOR_MODE_NORMAL;
184}
185
186static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
187{
188 struct wm8400 *wm8400 = rdev_get_drvdata(dev);
189 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
190 int ret;
191
192 switch (mode) {
193 case REGULATOR_MODE_FAST:
194 /* Datasheet: active with force PWM */
195 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
196 WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
197 if (ret != 0)
198 return ret;
199
200 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
201 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
202 WM8400_DC1_ACTIVE);
203
204 case REGULATOR_MODE_NORMAL:
205 /* Datasheet: active */
206 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
207 WM8400_DC1_FRC_PWM, 0);
208 if (ret != 0)
209 return ret;
210
211 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
212 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
213 WM8400_DC1_ACTIVE);
214
215 case REGULATOR_MODE_IDLE:
216 /* Datasheet: standby */
217 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
218 WM8400_DC1_ACTIVE, 0);
219 if (ret != 0)
220 return ret;
221 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
222 WM8400_DC1_SLEEP, 0);
223
224 default:
225 return -EINVAL;
226 }
227}
228
229static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
230 int input_uV, int output_uV,
231 int load_uA)
232{
233 return REGULATOR_MODE_NORMAL;
234}
235
236static struct regulator_ops wm8400_dcdc_ops = {
237 .is_enabled = wm8400_dcdc_is_enabled,
238 .enable = wm8400_dcdc_enable,
239 .disable = wm8400_dcdc_disable,
240 .get_voltage = wm8400_dcdc_get_voltage,
241 .set_voltage = wm8400_dcdc_set_voltage,
242 .get_mode = wm8400_dcdc_get_mode,
243 .set_mode = wm8400_dcdc_set_mode,
244 .get_optimum_mode = wm8400_dcdc_get_optimum_mode,
245};
246
247static struct regulator_desc regulators[] = {
248 {
249 .name = "LDO1",
250 .id = WM8400_LDO1,
251 .ops = &wm8400_ldo_ops,
252 .type = REGULATOR_VOLTAGE,
253 .owner = THIS_MODULE,
254 },
255 {
256 .name = "LDO2",
257 .id = WM8400_LDO2,
258 .ops = &wm8400_ldo_ops,
259 .type = REGULATOR_VOLTAGE,
260 .owner = THIS_MODULE,
261 },
262 {
263 .name = "LDO3",
264 .id = WM8400_LDO3,
265 .ops = &wm8400_ldo_ops,
266 .type = REGULATOR_VOLTAGE,
267 .owner = THIS_MODULE,
268 },
269 {
270 .name = "LDO4",
271 .id = WM8400_LDO4,
272 .ops = &wm8400_ldo_ops,
273 .type = REGULATOR_VOLTAGE,
274 .owner = THIS_MODULE,
275 },
276 {
277 .name = "DCDC1",
278 .id = WM8400_DCDC1,
279 .ops = &wm8400_dcdc_ops,
280 .type = REGULATOR_VOLTAGE,
281 .owner = THIS_MODULE,
282 },
283 {
284 .name = "DCDC2",
285 .id = WM8400_DCDC2,
286 .ops = &wm8400_dcdc_ops,
287 .type = REGULATOR_VOLTAGE,
288 .owner = THIS_MODULE,
289 },
290};
291
Uwe Kleine-König5dbdf732009-01-12 23:25:05 +0100292static int __devinit wm8400_regulator_probe(struct platform_device *pdev)
Mark Brown42fad572008-09-11 11:12:01 +0100293{
294 struct regulator_dev *rdev;
295
296 rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
297 pdev->dev.driver_data);
298
299 if (IS_ERR(rdev))
300 return PTR_ERR(rdev);
301
302 return 0;
303}
304
305static int __devexit wm8400_regulator_remove(struct platform_device *pdev)
306{
307 struct regulator_dev *rdev = platform_get_drvdata(pdev);
308
309 regulator_unregister(rdev);
310
311 return 0;
312}
313
314static struct platform_driver wm8400_regulator_driver = {
315 .driver = {
316 .name = "wm8400-regulator",
317 },
318 .probe = wm8400_regulator_probe,
319 .remove = __devexit_p(wm8400_regulator_remove),
320};
321
322/**
323 * wm8400_register_regulator - enable software control of a WM8400 regulator
324 *
325 * This function enables software control of a WM8400 regulator via
326 * the regulator API. It is intended to be called from the
327 * platform_init() callback of the WM8400 MFD driver.
328 *
329 * @param dev The WM8400 device to operate on.
330 * @param reg The regulator to control.
331 * @param initdata Regulator initdata for the regulator.
332 */
333int wm8400_register_regulator(struct device *dev, int reg,
334 struct regulator_init_data *initdata)
335{
336 struct wm8400 *wm8400 = dev->driver_data;
337
338 if (wm8400->regulators[reg].name)
339 return -EBUSY;
340
341 initdata->driver_data = wm8400;
342
343 wm8400->regulators[reg].name = "wm8400-regulator";
344 wm8400->regulators[reg].id = reg;
345 wm8400->regulators[reg].dev.parent = dev;
346 wm8400->regulators[reg].dev.driver_data = wm8400;
347 wm8400->regulators[reg].dev.platform_data = initdata;
348
349 return platform_device_register(&wm8400->regulators[reg]);
350}
351EXPORT_SYMBOL_GPL(wm8400_register_regulator);
352
353static int __init wm8400_regulator_init(void)
354{
355 return platform_driver_register(&wm8400_regulator_driver);
356}
357module_init(wm8400_regulator_init);
358
359static void __exit wm8400_regulator_exit(void)
360{
361 platform_driver_unregister(&wm8400_regulator_driver);
362}
363module_exit(wm8400_regulator_exit);
364
365MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
366MODULE_DESCRIPTION("WM8400 regulator driver");
367MODULE_LICENSE("GPL");
368MODULE_ALIAS("platform:wm8400-regulator");