Loading...
1// SPDX-License-Identifier: GPL-2.0+
2//
3// Regulator support for WM8400
4//
5// Copyright 2008 Wolfson Microelectronics PLC.
6//
7// Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
8
9#include <linux/bug.h>
10#include <linux/err.h>
11#include <linux/kernel.h>
12#include <linux/module.h>
13#include <linux/regulator/driver.h>
14#include <linux/mfd/wm8400-private.h>
15
16static const struct linear_range wm8400_ldo_ranges[] = {
17 REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000),
18 REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000),
19};
20
21static const struct regulator_ops wm8400_ldo_ops = {
22 .is_enabled = regulator_is_enabled_regmap,
23 .enable = regulator_enable_regmap,
24 .disable = regulator_disable_regmap,
25 .list_voltage = regulator_list_voltage_linear_range,
26 .get_voltage_sel = regulator_get_voltage_sel_regmap,
27 .set_voltage_sel = regulator_set_voltage_sel_regmap,
28 .map_voltage = regulator_map_voltage_linear_range,
29};
30
31static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
32{
33 struct regmap *rmap = rdev_get_regmap(dev);
34 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
35 u16 data[2];
36 int ret;
37
38 ret = regmap_bulk_read(rmap, WM8400_DCDC1_CONTROL_1 + offset, data, 2);
39 if (ret != 0)
40 return 0;
41
42 /* Datasheet: hibernate */
43 if (data[0] & WM8400_DC1_SLEEP)
44 return REGULATOR_MODE_STANDBY;
45
46 /* Datasheet: standby */
47 if (!(data[0] & WM8400_DC1_ACTIVE))
48 return REGULATOR_MODE_IDLE;
49
50 /* Datasheet: active with or without force PWM */
51 if (data[1] & WM8400_DC1_FRC_PWM)
52 return REGULATOR_MODE_FAST;
53 else
54 return REGULATOR_MODE_NORMAL;
55}
56
57static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
58{
59 struct regmap *rmap = rdev_get_regmap(dev);
60 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
61 int ret;
62
63 switch (mode) {
64 case REGULATOR_MODE_FAST:
65 /* Datasheet: active with force PWM */
66 ret = regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_2 + offset,
67 WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
68 if (ret != 0)
69 return ret;
70
71 return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset,
72 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
73 WM8400_DC1_ACTIVE);
74
75 case REGULATOR_MODE_NORMAL:
76 /* Datasheet: active */
77 ret = regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_2 + offset,
78 WM8400_DC1_FRC_PWM, 0);
79 if (ret != 0)
80 return ret;
81
82 return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset,
83 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
84 WM8400_DC1_ACTIVE);
85
86 case REGULATOR_MODE_IDLE:
87 /* Datasheet: standby */
88 return regmap_update_bits(rmap, WM8400_DCDC1_CONTROL_1 + offset,
89 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0);
90 default:
91 return -EINVAL;
92 }
93}
94
95static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
96 int input_uV, int output_uV,
97 int load_uA)
98{
99 return REGULATOR_MODE_NORMAL;
100}
101
102static const struct regulator_ops wm8400_dcdc_ops = {
103 .is_enabled = regulator_is_enabled_regmap,
104 .enable = regulator_enable_regmap,
105 .disable = regulator_disable_regmap,
106 .list_voltage = regulator_list_voltage_linear,
107 .map_voltage = regulator_map_voltage_linear,
108 .get_voltage_sel = regulator_get_voltage_sel_regmap,
109 .set_voltage_sel = regulator_set_voltage_sel_regmap,
110 .get_mode = wm8400_dcdc_get_mode,
111 .set_mode = wm8400_dcdc_set_mode,
112 .get_optimum_mode = wm8400_dcdc_get_optimum_mode,
113};
114
115static struct regulator_desc regulators[] = {
116 {
117 .name = "LDO1",
118 .id = WM8400_LDO1,
119 .ops = &wm8400_ldo_ops,
120 .enable_reg = WM8400_LDO1_CONTROL,
121 .enable_mask = WM8400_LDO1_ENA,
122 .n_voltages = WM8400_LDO1_VSEL_MASK + 1,
123 .linear_ranges = wm8400_ldo_ranges,
124 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
125 .vsel_reg = WM8400_LDO1_CONTROL,
126 .vsel_mask = WM8400_LDO1_VSEL_MASK,
127 .type = REGULATOR_VOLTAGE,
128 .owner = THIS_MODULE,
129 },
130 {
131 .name = "LDO2",
132 .id = WM8400_LDO2,
133 .ops = &wm8400_ldo_ops,
134 .enable_reg = WM8400_LDO2_CONTROL,
135 .enable_mask = WM8400_LDO2_ENA,
136 .n_voltages = WM8400_LDO2_VSEL_MASK + 1,
137 .linear_ranges = wm8400_ldo_ranges,
138 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
139 .type = REGULATOR_VOLTAGE,
140 .vsel_reg = WM8400_LDO2_CONTROL,
141 .vsel_mask = WM8400_LDO2_VSEL_MASK,
142 .owner = THIS_MODULE,
143 },
144 {
145 .name = "LDO3",
146 .id = WM8400_LDO3,
147 .ops = &wm8400_ldo_ops,
148 .enable_reg = WM8400_LDO3_CONTROL,
149 .enable_mask = WM8400_LDO3_ENA,
150 .n_voltages = WM8400_LDO3_VSEL_MASK + 1,
151 .linear_ranges = wm8400_ldo_ranges,
152 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
153 .vsel_reg = WM8400_LDO3_CONTROL,
154 .vsel_mask = WM8400_LDO3_VSEL_MASK,
155 .type = REGULATOR_VOLTAGE,
156 .owner = THIS_MODULE,
157 },
158 {
159 .name = "LDO4",
160 .id = WM8400_LDO4,
161 .ops = &wm8400_ldo_ops,
162 .enable_reg = WM8400_LDO4_CONTROL,
163 .enable_mask = WM8400_LDO4_ENA,
164 .n_voltages = WM8400_LDO4_VSEL_MASK + 1,
165 .linear_ranges = wm8400_ldo_ranges,
166 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
167 .vsel_reg = WM8400_LDO4_CONTROL,
168 .vsel_mask = WM8400_LDO4_VSEL_MASK,
169 .type = REGULATOR_VOLTAGE,
170 .owner = THIS_MODULE,
171 },
172 {
173 .name = "DCDC1",
174 .id = WM8400_DCDC1,
175 .ops = &wm8400_dcdc_ops,
176 .enable_reg = WM8400_DCDC1_CONTROL_1,
177 .enable_mask = WM8400_DC1_ENA_MASK,
178 .n_voltages = WM8400_DC1_VSEL_MASK + 1,
179 .vsel_reg = WM8400_DCDC1_CONTROL_1,
180 .vsel_mask = WM8400_DC1_VSEL_MASK,
181 .min_uV = 850000,
182 .uV_step = 25000,
183 .type = REGULATOR_VOLTAGE,
184 .owner = THIS_MODULE,
185 },
186 {
187 .name = "DCDC2",
188 .id = WM8400_DCDC2,
189 .ops = &wm8400_dcdc_ops,
190 .enable_reg = WM8400_DCDC2_CONTROL_1,
191 .enable_mask = WM8400_DC2_ENA_MASK,
192 .n_voltages = WM8400_DC2_VSEL_MASK + 1,
193 .vsel_reg = WM8400_DCDC2_CONTROL_1,
194 .vsel_mask = WM8400_DC2_VSEL_MASK,
195 .min_uV = 850000,
196 .uV_step = 25000,
197 .type = REGULATOR_VOLTAGE,
198 .owner = THIS_MODULE,
199 },
200};
201
202static int wm8400_regulator_probe(struct platform_device *pdev)
203{
204 struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
205 struct regulator_config config = { };
206 struct regulator_dev *rdev;
207
208 config.dev = &pdev->dev;
209 config.init_data = dev_get_platdata(&pdev->dev);
210 config.driver_data = wm8400;
211 config.regmap = wm8400->regmap;
212
213 rdev = devm_regulator_register(&pdev->dev, ®ulators[pdev->id],
214 &config);
215 if (IS_ERR(rdev))
216 return PTR_ERR(rdev);
217
218 platform_set_drvdata(pdev, rdev);
219
220 return 0;
221}
222
223static struct platform_driver wm8400_regulator_driver = {
224 .driver = {
225 .name = "wm8400-regulator",
226 },
227 .probe = wm8400_regulator_probe,
228};
229
230/**
231 * wm8400_register_regulator - enable software control of a WM8400 regulator
232 *
233 * This function enables software control of a WM8400 regulator via
234 * the regulator API. It is intended to be called from the
235 * platform_init() callback of the WM8400 MFD driver.
236 *
237 * @dev: The WM8400 device to operate on.
238 * @reg: The regulator to control.
239 * @initdata: Regulator initdata for the regulator.
240 */
241int wm8400_register_regulator(struct device *dev, int reg,
242 struct regulator_init_data *initdata)
243{
244 struct wm8400 *wm8400 = dev_get_drvdata(dev);
245
246 if (wm8400->regulators[reg].name)
247 return -EBUSY;
248
249 initdata->driver_data = wm8400;
250
251 wm8400->regulators[reg].name = "wm8400-regulator";
252 wm8400->regulators[reg].id = reg;
253 wm8400->regulators[reg].dev.parent = dev;
254 wm8400->regulators[reg].dev.platform_data = initdata;
255
256 return platform_device_register(&wm8400->regulators[reg]);
257}
258EXPORT_SYMBOL_GPL(wm8400_register_regulator);
259
260static int __init wm8400_regulator_init(void)
261{
262 return platform_driver_register(&wm8400_regulator_driver);
263}
264subsys_initcall(wm8400_regulator_init);
265
266static void __exit wm8400_regulator_exit(void)
267{
268 platform_driver_unregister(&wm8400_regulator_driver);
269}
270module_exit(wm8400_regulator_exit);
271
272MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
273MODULE_DESCRIPTION("WM8400 regulator driver");
274MODULE_LICENSE("GPL");
275MODULE_ALIAS("platform:wm8400-regulator");
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
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_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
58static 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
69static 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
102static 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
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
139static 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
148static 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
160static 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
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,
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
271static 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
322static 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(®ulators[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
338static 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
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{
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}
384EXPORT_SYMBOL_GPL(wm8400_register_regulator);
385
386static int __init wm8400_regulator_init(void)
387{
388 return platform_driver_register(&wm8400_regulator_driver);
389}
390subsys_initcall(wm8400_regulator_init);
391
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");