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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 const 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 .probe_type = PROBE_PREFER_ASYNCHRONOUS,
227 },
228 .probe = wm8400_regulator_probe,
229};
230
231/**
232 * wm8400_register_regulator - enable software control of a WM8400 regulator
233 *
234 * This function enables software control of a WM8400 regulator via
235 * the regulator API. It is intended to be called from the
236 * platform_init() callback of the WM8400 MFD driver.
237 *
238 * @dev: The WM8400 device to operate on.
239 * @reg: The regulator to control.
240 * @initdata: Regulator initdata for the regulator.
241 */
242int wm8400_register_regulator(struct device *dev, int reg,
243 struct regulator_init_data *initdata)
244{
245 struct wm8400 *wm8400 = dev_get_drvdata(dev);
246
247 if (wm8400->regulators[reg].name)
248 return -EBUSY;
249
250 initdata->driver_data = wm8400;
251
252 wm8400->regulators[reg].name = "wm8400-regulator";
253 wm8400->regulators[reg].id = reg;
254 wm8400->regulators[reg].dev.parent = dev;
255 wm8400->regulators[reg].dev.platform_data = initdata;
256
257 return platform_device_register(&wm8400->regulators[reg]);
258}
259EXPORT_SYMBOL_GPL(wm8400_register_regulator);
260
261static int __init wm8400_regulator_init(void)
262{
263 return platform_driver_register(&wm8400_regulator_driver);
264}
265subsys_initcall(wm8400_regulator_init);
266
267static void __exit wm8400_regulator_exit(void)
268{
269 platform_driver_unregister(&wm8400_regulator_driver);
270}
271module_exit(wm8400_regulator_exit);
272
273MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
274MODULE_DESCRIPTION("WM8400 regulator driver");
275MODULE_LICENSE("GPL");
276MODULE_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/module.h>
19#include <linux/regulator/driver.h>
20#include <linux/mfd/wm8400-private.h>
21
22static int wm8400_ldo_list_voltage(struct regulator_dev *dev,
23 unsigned selector)
24{
25 if (selector > WM8400_LDO1_VSEL_MASK)
26 return -EINVAL;
27
28 if (selector < 15)
29 return 900000 + (selector * 50000);
30 else
31 return 1600000 + ((selector - 14) * 100000);
32}
33
34static int wm8400_ldo_map_voltage(struct regulator_dev *dev,
35 int min_uV, int max_uV)
36{
37 u16 val;
38
39 if (min_uV < 900000 || min_uV > 3300000)
40 return -EINVAL;
41
42 if (min_uV < 1700000) {
43 /* Steps of 50mV from 900mV; */
44 val = DIV_ROUND_UP(min_uV - 900000, 50000);
45
46 if ((val * 50000) + 900000 > max_uV)
47 return -EINVAL;
48 BUG_ON((val * 50000) + 900000 < min_uV);
49 } else {
50 /* Steps of 100mV from 1700mV */
51 val = DIV_ROUND_UP(min_uV - 1700000, 100000);
52
53 if ((val * 100000) + 1700000 > max_uV)
54 return -EINVAL;
55 BUG_ON((val * 100000) + 1700000 < min_uV);
56
57 val += 0xf;
58 }
59
60 return val;
61}
62
63static struct regulator_ops wm8400_ldo_ops = {
64 .is_enabled = regulator_is_enabled_regmap,
65 .enable = regulator_enable_regmap,
66 .disable = regulator_disable_regmap,
67 .list_voltage = wm8400_ldo_list_voltage,
68 .get_voltage_sel = regulator_get_voltage_sel_regmap,
69 .set_voltage_sel = regulator_set_voltage_sel_regmap,
70 .map_voltage = wm8400_ldo_map_voltage,
71};
72
73static unsigned int wm8400_dcdc_get_mode(struct regulator_dev *dev)
74{
75 struct wm8400 *wm8400 = rdev_get_drvdata(dev);
76 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
77 u16 data[2];
78 int ret;
79
80 ret = wm8400_block_read(wm8400, WM8400_DCDC1_CONTROL_1 + offset, 2,
81 data);
82 if (ret != 0)
83 return 0;
84
85 /* Datasheet: hibernate */
86 if (data[0] & WM8400_DC1_SLEEP)
87 return REGULATOR_MODE_STANDBY;
88
89 /* Datasheet: standby */
90 if (!(data[0] & WM8400_DC1_ACTIVE))
91 return REGULATOR_MODE_IDLE;
92
93 /* Datasheet: active with or without force PWM */
94 if (data[1] & WM8400_DC1_FRC_PWM)
95 return REGULATOR_MODE_FAST;
96 else
97 return REGULATOR_MODE_NORMAL;
98}
99
100static int wm8400_dcdc_set_mode(struct regulator_dev *dev, unsigned int mode)
101{
102 struct wm8400 *wm8400 = rdev_get_drvdata(dev);
103 int offset = (rdev_get_id(dev) - WM8400_DCDC1) * 2;
104 int ret;
105
106 switch (mode) {
107 case REGULATOR_MODE_FAST:
108 /* Datasheet: active with force PWM */
109 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
110 WM8400_DC1_FRC_PWM, WM8400_DC1_FRC_PWM);
111 if (ret != 0)
112 return ret;
113
114 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
115 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
116 WM8400_DC1_ACTIVE);
117
118 case REGULATOR_MODE_NORMAL:
119 /* Datasheet: active */
120 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_2 + offset,
121 WM8400_DC1_FRC_PWM, 0);
122 if (ret != 0)
123 return ret;
124
125 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
126 WM8400_DC1_ACTIVE | WM8400_DC1_SLEEP,
127 WM8400_DC1_ACTIVE);
128
129 case REGULATOR_MODE_IDLE:
130 /* Datasheet: standby */
131 ret = wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
132 WM8400_DC1_ACTIVE, 0);
133 if (ret != 0)
134 return ret;
135 return wm8400_set_bits(wm8400, WM8400_DCDC1_CONTROL_1 + offset,
136 WM8400_DC1_SLEEP, 0);
137
138 default:
139 return -EINVAL;
140 }
141}
142
143static unsigned int wm8400_dcdc_get_optimum_mode(struct regulator_dev *dev,
144 int input_uV, int output_uV,
145 int load_uA)
146{
147 return REGULATOR_MODE_NORMAL;
148}
149
150static struct regulator_ops wm8400_dcdc_ops = {
151 .is_enabled = regulator_is_enabled_regmap,
152 .enable = regulator_enable_regmap,
153 .disable = regulator_disable_regmap,
154 .list_voltage = regulator_list_voltage_linear,
155 .get_voltage_sel = regulator_get_voltage_sel_regmap,
156 .set_voltage_sel = regulator_set_voltage_sel_regmap,
157 .get_mode = wm8400_dcdc_get_mode,
158 .set_mode = wm8400_dcdc_set_mode,
159 .get_optimum_mode = wm8400_dcdc_get_optimum_mode,
160};
161
162static struct regulator_desc regulators[] = {
163 {
164 .name = "LDO1",
165 .id = WM8400_LDO1,
166 .ops = &wm8400_ldo_ops,
167 .enable_reg = WM8400_LDO1_CONTROL,
168 .enable_mask = WM8400_LDO1_ENA,
169 .n_voltages = WM8400_LDO1_VSEL_MASK + 1,
170 .vsel_reg = WM8400_LDO1_CONTROL,
171 .vsel_mask = WM8400_LDO1_VSEL_MASK,
172 .type = REGULATOR_VOLTAGE,
173 .owner = THIS_MODULE,
174 },
175 {
176 .name = "LDO2",
177 .id = WM8400_LDO2,
178 .ops = &wm8400_ldo_ops,
179 .enable_reg = WM8400_LDO2_CONTROL,
180 .enable_mask = WM8400_LDO2_ENA,
181 .n_voltages = WM8400_LDO2_VSEL_MASK + 1,
182 .type = REGULATOR_VOLTAGE,
183 .vsel_reg = WM8400_LDO2_CONTROL,
184 .vsel_mask = WM8400_LDO2_VSEL_MASK,
185 .owner = THIS_MODULE,
186 },
187 {
188 .name = "LDO3",
189 .id = WM8400_LDO3,
190 .ops = &wm8400_ldo_ops,
191 .enable_reg = WM8400_LDO3_CONTROL,
192 .enable_mask = WM8400_LDO3_ENA,
193 .n_voltages = WM8400_LDO3_VSEL_MASK + 1,
194 .vsel_reg = WM8400_LDO3_CONTROL,
195 .vsel_mask = WM8400_LDO3_VSEL_MASK,
196 .type = REGULATOR_VOLTAGE,
197 .owner = THIS_MODULE,
198 },
199 {
200 .name = "LDO4",
201 .id = WM8400_LDO4,
202 .ops = &wm8400_ldo_ops,
203 .enable_reg = WM8400_LDO4_CONTROL,
204 .enable_mask = WM8400_LDO4_ENA,
205 .n_voltages = WM8400_LDO4_VSEL_MASK + 1,
206 .vsel_reg = WM8400_LDO4_CONTROL,
207 .vsel_mask = WM8400_LDO4_VSEL_MASK,
208 .type = REGULATOR_VOLTAGE,
209 .owner = THIS_MODULE,
210 },
211 {
212 .name = "DCDC1",
213 .id = WM8400_DCDC1,
214 .ops = &wm8400_dcdc_ops,
215 .enable_reg = WM8400_DCDC1_CONTROL_1,
216 .enable_mask = WM8400_DC1_ENA_MASK,
217 .n_voltages = WM8400_DC1_VSEL_MASK + 1,
218 .vsel_reg = WM8400_DCDC1_CONTROL_1,
219 .vsel_mask = WM8400_DC1_VSEL_MASK,
220 .min_uV = 850000,
221 .uV_step = 25000,
222 .type = REGULATOR_VOLTAGE,
223 .owner = THIS_MODULE,
224 },
225 {
226 .name = "DCDC2",
227 .id = WM8400_DCDC2,
228 .ops = &wm8400_dcdc_ops,
229 .enable_reg = WM8400_DCDC2_CONTROL_1,
230 .enable_mask = WM8400_DC1_ENA_MASK,
231 .n_voltages = WM8400_DC2_VSEL_MASK + 1,
232 .vsel_reg = WM8400_DCDC2_CONTROL_1,
233 .vsel_mask = WM8400_DC2_VSEL_MASK,
234 .min_uV = 850000,
235 .uV_step = 25000,
236 .type = REGULATOR_VOLTAGE,
237 .owner = THIS_MODULE,
238 },
239};
240
241static int __devinit wm8400_regulator_probe(struct platform_device *pdev)
242{
243 struct wm8400 *wm8400 = container_of(pdev, struct wm8400, regulators[pdev->id]);
244 struct regulator_config config = { };
245 struct regulator_dev *rdev;
246
247 config.dev = &pdev->dev;
248 config.init_data = pdev->dev.platform_data;
249 config.driver_data = wm8400;
250 config.regmap = wm8400->regmap;
251
252 rdev = regulator_register(®ulators[pdev->id], &config);
253 if (IS_ERR(rdev))
254 return PTR_ERR(rdev);
255
256 platform_set_drvdata(pdev, rdev);
257
258 return 0;
259}
260
261static int __devexit wm8400_regulator_remove(struct platform_device *pdev)
262{
263 struct regulator_dev *rdev = platform_get_drvdata(pdev);
264
265 platform_set_drvdata(pdev, NULL);
266 regulator_unregister(rdev);
267
268 return 0;
269}
270
271static struct platform_driver wm8400_regulator_driver = {
272 .driver = {
273 .name = "wm8400-regulator",
274 },
275 .probe = wm8400_regulator_probe,
276 .remove = __devexit_p(wm8400_regulator_remove),
277};
278
279/**
280 * wm8400_register_regulator - enable software control of a WM8400 regulator
281 *
282 * This function enables software control of a WM8400 regulator via
283 * the regulator API. It is intended to be called from the
284 * platform_init() callback of the WM8400 MFD driver.
285 *
286 * @param dev The WM8400 device to operate on.
287 * @param reg The regulator to control.
288 * @param initdata Regulator initdata for the regulator.
289 */
290int wm8400_register_regulator(struct device *dev, int reg,
291 struct regulator_init_data *initdata)
292{
293 struct wm8400 *wm8400 = dev_get_drvdata(dev);
294
295 if (wm8400->regulators[reg].name)
296 return -EBUSY;
297
298 initdata->driver_data = wm8400;
299
300 wm8400->regulators[reg].name = "wm8400-regulator";
301 wm8400->regulators[reg].id = reg;
302 wm8400->regulators[reg].dev.parent = dev;
303 wm8400->regulators[reg].dev.platform_data = initdata;
304
305 return platform_device_register(&wm8400->regulators[reg]);
306}
307EXPORT_SYMBOL_GPL(wm8400_register_regulator);
308
309static int __init wm8400_regulator_init(void)
310{
311 return platform_driver_register(&wm8400_regulator_driver);
312}
313subsys_initcall(wm8400_regulator_init);
314
315static void __exit wm8400_regulator_exit(void)
316{
317 platform_driver_unregister(&wm8400_regulator_driver);
318}
319module_exit(wm8400_regulator_exit);
320
321MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
322MODULE_DESCRIPTION("WM8400 regulator driver");
323MODULE_LICENSE("GPL");
324MODULE_ALIAS("platform:wm8400-regulator");