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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>
Paul Gortmaker65602c32011-07-17 16:28:23 -040018#include <linux/module.h>
Mark Brown42fad572008-09-11 11:12:01 +010019#include <linux/regulator/driver.h>
20#include <linux/mfd/wm8400-private.h>
21
Mark Brown6692e432013-07-02 23:26:36 +010022static const struct regulator_linear_range wm8400_ldo_ranges[] = {
Axel Lin8828bae2013-10-11 09:32:18 +080023 REGULATOR_LINEAR_RANGE(900000, 0, 14, 50000),
24 REGULATOR_LINEAR_RANGE(1700000, 15, 31, 100000),
Mark Brown6692e432013-07-02 23:26:36 +010025};
Mark Brown42fad572008-09-11 11:12:01 +010026
Julia Lawallb0d6dd32015-12-19 16:31:24 +010027static const struct regulator_ops wm8400_ldo_ops = {
Mark Brownc54a1552012-05-10 00:12:09 +010028 .is_enabled = regulator_is_enabled_regmap,
29 .enable = regulator_enable_regmap,
30 .disable = regulator_disable_regmap,
Mark Brown6692e432013-07-02 23:26:36 +010031 .list_voltage = regulator_list_voltage_linear_range,
Mark Brownc54a1552012-05-10 00:12:09 +010032 .get_voltage_sel = regulator_get_voltage_sel_regmap,
33 .set_voltage_sel = regulator_set_voltage_sel_regmap,
Mark Brown6692e432013-07-02 23:26:36 +010034 .map_voltage = regulator_map_voltage_linear_range,
Mark Brownc54a1552012-05-10 00:12:09 +010035};
Mark Brown42fad572008-09-11 11:12:01 +010036
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 */
Mark Brown42fad572008-09-11 11:12:01 +010095 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
Axel Lin40013762012-08-01 09:15:11 +080096 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP, 0);
Mark Brown42fad572008-09-11 11:12:01 +010097 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
Julia Lawallb0d6dd32015-12-19 16:31:24 +0100109static const struct regulator_ops wm8400_dcdc_ops = {
Mark Brownc54a1552012-05-10 00:12:09 +0100110 .is_enabled = regulator_is_enabled_regmap,
111 .enable = regulator_enable_regmap,
112 .disable = regulator_disable_regmap,
113 .list_voltage = regulator_list_voltage_linear,
Axel Lin27eeabb2012-05-31 17:40:22 +0800114 .map_voltage = regulator_map_voltage_linear,
Mark Brownc54a1552012-05-10 00:12:09 +0100115 .get_voltage_sel = regulator_get_voltage_sel_regmap,
116 .set_voltage_sel = regulator_set_voltage_sel_regmap,
Mark Brown42fad572008-09-11 11:12:01 +0100117 .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,
Mark Brownc54a1552012-05-10 00:12:09 +0100127 .enable_reg = WM8400_LDO1_CONTROL,
128 .enable_mask = WM8400_LDO1_ENA,
Mark Brown216765d2009-03-10 16:28:35 +0000129 .n_voltages = WM8400_LDO1_VSEL_MASK + 1,
Mark Brown6692e432013-07-02 23:26:36 +0100130 .linear_ranges = wm8400_ldo_ranges,
131 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
Mark Brownc54a1552012-05-10 00:12:09 +0100132 .vsel_reg = WM8400_LDO1_CONTROL,
133 .vsel_mask = WM8400_LDO1_VSEL_MASK,
Mark Brown42fad572008-09-11 11:12:01 +0100134 .type = REGULATOR_VOLTAGE,
135 .owner = THIS_MODULE,
136 },
137 {
138 .name = "LDO2",
139 .id = WM8400_LDO2,
140 .ops = &wm8400_ldo_ops,
Mark Brownc54a1552012-05-10 00:12:09 +0100141 .enable_reg = WM8400_LDO2_CONTROL,
142 .enable_mask = WM8400_LDO2_ENA,
Mark Brown216765d2009-03-10 16:28:35 +0000143 .n_voltages = WM8400_LDO2_VSEL_MASK + 1,
Mark Brown6692e432013-07-02 23:26:36 +0100144 .linear_ranges = wm8400_ldo_ranges,
145 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
Mark Brown42fad572008-09-11 11:12:01 +0100146 .type = REGULATOR_VOLTAGE,
Mark Brownc54a1552012-05-10 00:12:09 +0100147 .vsel_reg = WM8400_LDO2_CONTROL,
148 .vsel_mask = WM8400_LDO2_VSEL_MASK,
Mark Brown42fad572008-09-11 11:12:01 +0100149 .owner = THIS_MODULE,
150 },
151 {
152 .name = "LDO3",
153 .id = WM8400_LDO3,
154 .ops = &wm8400_ldo_ops,
Mark Brownc54a1552012-05-10 00:12:09 +0100155 .enable_reg = WM8400_LDO3_CONTROL,
156 .enable_mask = WM8400_LDO3_ENA,
Mark Brown216765d2009-03-10 16:28:35 +0000157 .n_voltages = WM8400_LDO3_VSEL_MASK + 1,
Mark Brown6692e432013-07-02 23:26:36 +0100158 .linear_ranges = wm8400_ldo_ranges,
159 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
Mark Brownc54a1552012-05-10 00:12:09 +0100160 .vsel_reg = WM8400_LDO3_CONTROL,
161 .vsel_mask = WM8400_LDO3_VSEL_MASK,
Mark Brown42fad572008-09-11 11:12:01 +0100162 .type = REGULATOR_VOLTAGE,
163 .owner = THIS_MODULE,
164 },
165 {
166 .name = "LDO4",
167 .id = WM8400_LDO4,
168 .ops = &wm8400_ldo_ops,
Mark Brownc54a1552012-05-10 00:12:09 +0100169 .enable_reg = WM8400_LDO4_CONTROL,
170 .enable_mask = WM8400_LDO4_ENA,
Mark Brown216765d2009-03-10 16:28:35 +0000171 .n_voltages = WM8400_LDO4_VSEL_MASK + 1,
Mark Brown6692e432013-07-02 23:26:36 +0100172 .linear_ranges = wm8400_ldo_ranges,
173 .n_linear_ranges = ARRAY_SIZE(wm8400_ldo_ranges),
Mark Brownc54a1552012-05-10 00:12:09 +0100174 .vsel_reg = WM8400_LDO4_CONTROL,
175 .vsel_mask = WM8400_LDO4_VSEL_MASK,
Mark Brown42fad572008-09-11 11:12:01 +0100176 .type = REGULATOR_VOLTAGE,
177 .owner = THIS_MODULE,
178 },
179 {
180 .name = "DCDC1",
181 .id = WM8400_DCDC1,
182 .ops = &wm8400_dcdc_ops,
Mark Brownc54a1552012-05-10 00:12:09 +0100183 .enable_reg = WM8400_DCDC1_CONTROL_1,
184 .enable_mask = WM8400_DC1_ENA_MASK,
Mark Brown216765d2009-03-10 16:28:35 +0000185 .n_voltages = WM8400_DC1_VSEL_MASK + 1,
Mark Brownc54a1552012-05-10 00:12:09 +0100186 .vsel_reg = WM8400_DCDC1_CONTROL_1,
187 .vsel_mask = WM8400_DC1_VSEL_MASK,
188 .min_uV = 850000,
189 .uV_step = 25000,
Mark Brown42fad572008-09-11 11:12:01 +0100190 .type = REGULATOR_VOLTAGE,
191 .owner = THIS_MODULE,
192 },
193 {
194 .name = "DCDC2",
195 .id = WM8400_DCDC2,
196 .ops = &wm8400_dcdc_ops,
Mark Brownc54a1552012-05-10 00:12:09 +0100197 .enable_reg = WM8400_DCDC2_CONTROL_1,
198 .enable_mask = WM8400_DC1_ENA_MASK,
Mark Brown216765d2009-03-10 16:28:35 +0000199 .n_voltages = WM8400_DC2_VSEL_MASK + 1,
Mark Brownc54a1552012-05-10 00:12:09 +0100200 .vsel_reg = WM8400_DCDC2_CONTROL_1,
201 .vsel_mask = WM8400_DC2_VSEL_MASK,
202 .min_uV = 850000,
203 .uV_step = 25000,
Mark Brown42fad572008-09-11 11:12:01 +0100204 .type = REGULATOR_VOLTAGE,
205 .owner = THIS_MODULE,
206 },
207};
208
Bill Pembertona5023572012-11-19 13:22:22 -0500209static int wm8400_regulator_probe(struct platform_device *pdev)
Mark Brown42fad572008-09-11 11:12:01 +0100210{
Dmitry Torokhov1ad02bb2010-02-25 01:55:37 -0800211 struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
Mark Brownc1727082012-04-04 00:50:22 +0100212 struct regulator_config config = { };
Mark Brown42fad572008-09-11 11:12:01 +0100213 struct regulator_dev *rdev;
214
Mark Brownc1727082012-04-04 00:50:22 +0100215 config.dev = &pdev->dev;
Jingoo Handff91d02013-07-30 17:20:47 +0900216 config.init_data = dev_get_platdata(&pdev->dev);
Mark Brownc1727082012-04-04 00:50:22 +0100217 config.driver_data = wm8400;
Mark Brownc54a1552012-05-10 00:12:09 +0100218 config.regmap = wm8400->regmap;
Mark Brown42fad572008-09-11 11:12:01 +0100219
Mark Browneb8b3c82013-08-31 12:00:57 +0100220 rdev = devm_regulator_register(&pdev->dev, &regulators[pdev->id],
221 &config);
Mark Brown42fad572008-09-11 11:12:01 +0100222 if (IS_ERR(rdev))
223 return PTR_ERR(rdev);
224
Dmitry Torokhov1ad02bb2010-02-25 01:55:37 -0800225 platform_set_drvdata(pdev, rdev);
226
Mark Brown42fad572008-09-11 11:12:01 +0100227 return 0;
228}
229
Mark Brown42fad572008-09-11 11:12:01 +0100230static struct platform_driver wm8400_regulator_driver = {
231 .driver = {
232 .name = "wm8400-regulator",
233 },
234 .probe = wm8400_regulator_probe,
Mark Brown42fad572008-09-11 11:12:01 +0100235};
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{
Greg Kroah-Hartman1909e2f2009-04-30 15:21:37 -0700251 struct wm8400 *wm8400 = dev_get_drvdata(dev);
Mark Brown42fad572008-09-11 11:12:01 +0100252
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;
Mark Brown42fad572008-09-11 11:12:01 +0100261 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}
Mark Brown5a1b22b2009-04-27 18:21:18 +0100271subsys_initcall(wm8400_regulator_init);
Mark Brown42fad572008-09-11 11:12:01 +0100272
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");