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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
Mark Brown216765d2009-03-10 16:28:35 +000046static 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
Mark Brown42fad572008-09-11 11:12:01 +010058static 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
Mark Brown216765d2009-03-10 16:28:35 +000066 return wm8400_ldo_list_voltage(dev, val);
Mark Brown42fad572008-09-11 11:12:01 +010067}
68
69static int wm8400_ldo_set_voltage(struct regulator_dev *dev,
Mark Brown3a93f2a2010-11-10 14:38:29 +000070 int min_uV, int max_uV, unsigned *selector)
Mark Brown42fad572008-09-11 11:12:01 +010071{
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
Mark Brown3a93f2a2010-11-10 14:38:29 +000096 *selector = val;
97
Mark Brown42fad572008-09-11 11:12:01 +010098 return wm8400_set_bits(wm8400, WM8400_LDO1_CONTROL + rdev_get_id(dev),
99 WM8400_LDO1_VSEL_MASK, val);
100}
101
102static struct regulator_ops wm8400_ldo_ops = {
103 .is_enabled = wm8400_ldo_is_enabled,
104 .enable = wm8400_ldo_enable,
105 .disable = wm8400_ldo_disable,
Mark Brown216765d2009-03-10 16:28:35 +0000106 .list_voltage = wm8400_ldo_list_voltage,
Mark Brown42fad572008-09-11 11:12:01 +0100107 .get_voltage = wm8400_ldo_get_voltage,
108 .set_voltage = wm8400_ldo_set_voltage,
109};
110
111static 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
121static 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
130static 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
Mark Brown216765d2009-03-10 16:28:35 +0000139static 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
Mark Brown42fad572008-09-11 11:12:01 +0100148static int wm8400_dcdc_get_voltage(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 850000 + (25000 * val);
158}
159
160static int wm8400_dcdc_set_voltage(struct regulator_dev *dev,
Mark Brown3a93f2a2010-11-10 14:38:29 +0000161 int min_uV, int max_uV, unsigned *selector)
Mark Brown42fad572008-09-11 11:12:01 +0100162{
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
Mark Brown3a93f2a2010-11-10 14:38:29 +0000176 *selector = val;
177
Mark Brown42fad572008-09-11 11:12:01 +0100178 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
179 WM8400_DC1_VSEL_MASK, val);
180}
181
182static 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
209static 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
252static 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
259static struct regulator_ops wm8400_dcdc_ops = {
260 .is_enabled = wm8400_dcdc_is_enabled,
261 .enable = wm8400_dcdc_enable,
262 .disable = wm8400_dcdc_disable,
Mark Brown216765d2009-03-10 16:28:35 +0000263 .list_voltage = wm8400_dcdc_list_voltage,
Mark Brown42fad572008-09-11 11:12:01 +0100264 .get_voltage = wm8400_dcdc_get_voltage,
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
271static struct regulator_desc regulators[] = {
272 {
273 .name = "LDO1",
274 .id = WM8400_LDO1,
275 .ops = &wm8400_ldo_ops,
Mark Brown216765d2009-03-10 16:28:35 +0000276 .n_voltages = WM8400_LDO1_VSEL_MASK + 1,
Mark Brown42fad572008-09-11 11:12:01 +0100277 .type = REGULATOR_VOLTAGE,
278 .owner = THIS_MODULE,
279 },
280 {
281 .name = "LDO2",
282 .id = WM8400_LDO2,
283 .ops = &wm8400_ldo_ops,
Mark Brown216765d2009-03-10 16:28:35 +0000284 .n_voltages = WM8400_LDO2_VSEL_MASK + 1,
Mark Brown42fad572008-09-11 11:12:01 +0100285 .type = REGULATOR_VOLTAGE,
286 .owner = THIS_MODULE,
287 },
288 {
289 .name = "LDO3",
290 .id = WM8400_LDO3,
291 .ops = &wm8400_ldo_ops,
Mark Brown216765d2009-03-10 16:28:35 +0000292 .n_voltages = WM8400_LDO3_VSEL_MASK + 1,
Mark Brown42fad572008-09-11 11:12:01 +0100293 .type = REGULATOR_VOLTAGE,
294 .owner = THIS_MODULE,
295 },
296 {
297 .name = "LDO4",
298 .id = WM8400_LDO4,
299 .ops = &wm8400_ldo_ops,
Mark Brown216765d2009-03-10 16:28:35 +0000300 .n_voltages = WM8400_LDO4_VSEL_MASK + 1,
Mark Brown42fad572008-09-11 11:12:01 +0100301 .type = REGULATOR_VOLTAGE,
302 .owner = THIS_MODULE,
303 },
304 {
305 .name = "DCDC1",
306 .id = WM8400_DCDC1,
307 .ops = &wm8400_dcdc_ops,
Mark Brown216765d2009-03-10 16:28:35 +0000308 .n_voltages = WM8400_DC1_VSEL_MASK + 1,
Mark Brown42fad572008-09-11 11:12:01 +0100309 .type = REGULATOR_VOLTAGE,
310 .owner = THIS_MODULE,
311 },
312 {
313 .name = "DCDC2",
314 .id = WM8400_DCDC2,
315 .ops = &wm8400_dcdc_ops,
Mark Brown216765d2009-03-10 16:28:35 +0000316 .n_voltages = WM8400_DC2_VSEL_MASK + 1,
Mark Brown42fad572008-09-11 11:12:01 +0100317 .type = REGULATOR_VOLTAGE,
318 .owner = THIS_MODULE,
319 },
320};
321
Uwe Kleine-König5dbdf732009-01-12 23:25:05 +0100322static int __devinit wm8400_regulator_probe(struct platform_device *pdev)
Mark Brown42fad572008-09-11 11:12:01 +0100323{
Dmitry Torokhov1ad02bb2010-02-25 01:55:37 -0800324 struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
Mark Brown42fad572008-09-11 11:12:01 +0100325 struct regulator_dev *rdev;
326
327 rdev = regulator_register(&regulators[pdev->id], &pdev->dev,
Dmitry Torokhov1ad02bb2010-02-25 01:55:37 -0800328 pdev->dev.platform_data, wm8400);
Mark Brown42fad572008-09-11 11:12:01 +0100329
330 if (IS_ERR(rdev))
331 return PTR_ERR(rdev);
332
Dmitry Torokhov1ad02bb2010-02-25 01:55:37 -0800333 platform_set_drvdata(pdev, rdev);
334
Mark Brown42fad572008-09-11 11:12:01 +0100335 return 0;
336}
337
338static int __devexit wm8400_regulator_remove(struct platform_device *pdev)
339{
340 struct regulator_dev *rdev = platform_get_drvdata(pdev);
341
Dmitry Torokhov1ad02bb2010-02-25 01:55:37 -0800342 platform_set_drvdata(pdev, NULL);
Mark Brown42fad572008-09-11 11:12:01 +0100343 regulator_unregister(rdev);
344
345 return 0;
346}
347
348static 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 */
367int wm8400_register_regulator(struct device *dev, int reg,
368 struct regulator_init_data *initdata)
369{
Greg Kroah-Hartman1909e2f2009-04-30 15:21:37 -0700370 struct wm8400 *wm8400 = dev_get_drvdata(dev);
Mark Brown42fad572008-09-11 11:12:01 +0100371
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;
Mark Brown42fad572008-09-11 11:12:01 +0100380 wm8400->regulators[reg].dev.platform_data = initdata;
381
382 return platform_device_register(&wm8400->regulators[reg]);
383}
384EXPORT_SYMBOL_GPL(wm8400_register_regulator);
385
386static int __init wm8400_regulator_init(void)
387{
388 return platform_driver_register(&wm8400_regulator_driver);
389}
Mark Brown5a1b22b2009-04-27 18:21:18 +0100390subsys_initcall(wm8400_regulator_init);
Mark Brown42fad572008-09-11 11:12:01 +0100391
392static void __exit wm8400_regulator_exit(void)
393{
394 platform_driver_unregister(&wm8400_regulator_driver);
395}
396module_exit(wm8400_regulator_exit);
397
398MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
399MODULE_DESCRIPTION("WM8400 regulator driver");
400MODULE_LICENSE("GPL");
401MODULE_ALIAS("platform:wm8400-regulator");