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/module.h>
19#include <linux/regulator/driver.h>
20#include <linux/mfd/wm8400-private.h>
21
22static const struct regulator_linear_range wm8400_ldo_ranges[] = {
23 REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000),
24 REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000),
25};
26
27static const struct regulator_ops wm8400_ldo_ops = {
28 .is_enabled = regulator_is_enabled_regmap,
29 .enable = regulator_enable_regmap,
30 .disable = regulator_disable_regmap,
31 .list_voltage = regulator_list_voltage_linear_range,
32 .get_voltage_sel = regulator_get_voltage_sel_regmap,
33 .set_voltage_sel = regulator_set_voltage_sel_regmap,
34 .map_voltage = regulator_map_voltage_linear_range,
35};
36
37static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
38{
39 struct wm8400 *wm8400 = rdev_get_drvdata(dev);
40 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
41 u16 data[2];
42 int ret;
43
44 ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
45 data);
46 if (ret != 0)
47 return 0;
48
49 /* Datasheet: hibernate */
50 if (data[0] & WM8400_DC1_SLEEP)
51 return REGULATOR_MODE_STANDBY;
52
53 /* Datasheet: standby */
54 if (!(data[0] & WM8400_DC1_ACTIVE))
55 return REGULATOR_MODE_IDLE;
56
57 /* Datasheet: active with or without force PWM */
58 if (data[1] & WM8400_DC1_FRC_PWM)
59 return REGULATOR_MODE_FAST;
60 else
61 return REGULATOR_MODE_NORMAL;
62}
63
64static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
65{
66 struct wm8400 *wm8400 = rdev_get_drvdata(dev);
67 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
68 int ret;
69
70 switch (mode) {
71 case REGULATOR_MODE_FAST:
72 /* Datasheet: active with force PWM */
73 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
74 WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
75 if (ret != 0)
76 return ret;
77
78 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
79 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
80 WM8400_DC1_ACTIVE);
81
82 case REGULATOR_MODE_NORMAL:
83 /* Datasheet: active */
84 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
85 WM8400_DC1_FRC_PWM, 0);
86 if (ret != 0)
87 return ret;
88
89 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
90 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
91 WM8400_DC1_ACTIVE);
92
93 case REGULATOR_MODE_IDLE:
94 /* Datasheet: standby */
95 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
96 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0);
97 default:
98 return -EINVAL;
99 }
100}
101
102static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
103 int input_uV, int output_uV,
104 int load_uA)
105{
106 return REGULATOR_MODE_NORMAL;
107}
108
109static const struct regulator_ops wm8400_dcdc_ops = {
110 .is_enabled = regulator_is_enabled_regmap,
111 .enable = regulator_enable_regmap,
112 .disable = regulator_disable_regmap,
113 .list_voltage = regulator_list_voltage_linear,
114 .map_voltage = regulator_map_voltage_linear,
115 .get_voltage_sel = regulator_get_voltage_sel_regmap,
116 .set_voltage_sel = regulator_set_voltage_sel_regmap,
117 .get_mode = wm8400_dcdc_get_mode,
118 .set_mode = wm8400_dcdc_set_mode,
119 .get_optimum_mode = wm8400_dcdc_get_optimum_mode,
120};
121
122static struct regulator_desc regulators[] = {
123 {
124 .name = "LDO1",
125 .id = WM8400_LDO1,
126 .ops = &wm8400_ldo_ops,
127 .enable_reg = WM8400_LDO1_CONTROL,
128 .enable_mask = WM8400_LDO1_ENA,
129 .n_voltages = WM8400_LDO1_VSEL_MASK + 1,
130 .linear_ranges = wm8400_ldo_ranges,
131 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
132 .vsel_reg = WM8400_LDO1_CONTROL,
133 .vsel_mask = WM8400_LDO1_VSEL_MASK,
134 .type = REGULATOR_VOLTAGE,
135 .owner = THIS_MODULE,
136 },
137 {
138 .name = "LDO2",
139 .id = WM8400_LDO2,
140 .ops = &wm8400_ldo_ops,
141 .enable_reg = WM8400_LDO2_CONTROL,
142 .enable_mask = WM8400_LDO2_ENA,
143 .n_voltages = WM8400_LDO2_VSEL_MASK + 1,
144 .linear_ranges = wm8400_ldo_ranges,
145 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
146 .type = REGULATOR_VOLTAGE,
147 .vsel_reg = WM8400_LDO2_CONTROL,
148 .vsel_mask = WM8400_LDO2_VSEL_MASK,
149 .owner = THIS_MODULE,
150 },
151 {
152 .name = "LDO3",
153 .id = WM8400_LDO3,
154 .ops = &wm8400_ldo_ops,
155 .enable_reg = WM8400_LDO3_CONTROL,
156 .enable_mask = WM8400_LDO3_ENA,
157 .n_voltages = WM8400_LDO3_VSEL_MASK + 1,
158 .linear_ranges = wm8400_ldo_ranges,
159 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
160 .vsel_reg = WM8400_LDO3_CONTROL,
161 .vsel_mask = WM8400_LDO3_VSEL_MASK,
162 .type = REGULATOR_VOLTAGE,
163 .owner = THIS_MODULE,
164 },
165 {
166 .name = "LDO4",
167 .id = WM8400_LDO4,
168 .ops = &wm8400_ldo_ops,
169 .enable_reg = WM8400_LDO4_CONTROL,
170 .enable_mask = WM8400_LDO4_ENA,
171 .n_voltages = WM8400_LDO4_VSEL_MASK + 1,
172 .linear_ranges = wm8400_ldo_ranges,
173 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
174 .vsel_reg = WM8400_LDO4_CONTROL,
175 .vsel_mask = WM8400_LDO4_VSEL_MASK,
176 .type = REGULATOR_VOLTAGE,
177 .owner = THIS_MODULE,
178 },
179 {
180 .name = "DCDC1",
181 .id = WM8400_DCDC1,
182 .ops = &wm8400_dcdc_ops,
183 .enable_reg = WM8400_DCDC1_CONTROL_1,
184 .enable_mask = WM8400_DC1_ENA_MASK,
185 .n_voltages = WM8400_DC1_VSEL_MASK + 1,
186 .vsel_reg = WM8400_DCDC1_CONTROL_1,
187 .vsel_mask = WM8400_DC1_VSEL_MASK,
188 .min_uV = 850000,
189 .uV_step = 25000,
190 .type = REGULATOR_VOLTAGE,
191 .owner = THIS_MODULE,
192 },
193 {
194 .name = "DCDC2",
195 .id = WM8400_DCDC2,
196 .ops = &wm8400_dcdc_ops,
197 .enable_reg = WM8400_DCDC2_CONTROL_1,
198 .enable_mask = WM8400_DC1_ENA_MASK,
199 .n_voltages = WM8400_DC2_VSEL_MASK + 1,
200 .vsel_reg = WM8400_DCDC2_CONTROL_1,
201 .vsel_mask = WM8400_DC2_VSEL_MASK,
202 .min_uV = 850000,
203 .uV_step = 25000,
204 .type = REGULATOR_VOLTAGE,
205 .owner = THIS_MODULE,
206 },
207};
208
209static int wm8400_regulator_probe(struct platform_device *pdev)
210{
211 struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
212 struct regulator_config config = { };
213 struct regulator_dev *rdev;
214
215 config.dev = &pdev->dev;
216 config.init_data = dev_get_platdata(&pdev->dev);
217 config.driver_data = wm8400;
218 config.regmap = wm8400->regmap;
219
220 rdev = devm_regulator_register(&pdev->dev, &regulators[pdev->id],
221 &config);
222 if (IS_ERR(rdev))
223 return PTR_ERR(rdev);
224
225 platform_set_drvdata(pdev, rdev);
226
227 return 0;
228}
229
230static struct platform_driver wm8400_regulator_driver = {
231 .driver = {
232 .name = "wm8400-regulator",
233 },
234 .probe = wm8400_regulator_probe,
235};
236
237/**
238 * wm8400_register_regulator - enable software control of a WM8400 regulator
239 *
240 * This function enables software control of a WM8400 regulator via
241 * the regulator API. It is intended to be called from the
242 * platform_init() callback of the WM8400 MFD driver.
243 *
244 * @param dev The WM8400 device to operate on.
245 * @param reg The regulator to control.
246 * @param initdata Regulator initdata for the regulator.
247 */
248int wm8400_register_regulator(struct device *dev, int reg,
249 struct regulator_init_data *initdata)
250{
251 struct wm8400 *wm8400 = dev_get_drvdata(dev);
252
253 if (wm8400->regulators[reg].name)
254 return -EBUSY;
255
256 initdata->driver_data = wm8400;
257
258 wm8400->regulators[reg].name = "wm8400-regulator";
259 wm8400->regulators[reg].id = reg;
260 wm8400->regulators[reg].dev.parent = dev;
261 wm8400->regulators[reg].dev.platform_data = initdata;
262
263 return platform_device_register(&wm8400->regulators[reg]);
264}
265EXPORT_SYMBOL_GPL(wm8400_register_regulator);
266
267static int __init wm8400_regulator_init(void)
268{
269 return platform_driver_register(&wm8400_regulator_driver);
270}
271subsys_initcall(wm8400_regulator_init);
272
273static void __exit wm8400_regulator_exit(void)
274{
275 platform_driver_unregister(&wm8400_regulator_driver);
276}
277module_exit(wm8400_regulator_exit);
278
279MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
280MODULE_DESCRIPTION("WM8400 regulator driver");
281MODULE_LICENSE("GPL");
282MODULE_ALIAS("platform:wm8400-regulator");
283