regulator: export of_get_regulator_init_data
[deliverable/linux.git] / drivers / regulator / fixed.c
CommitLineData
4b74ff65
MB
1/*
2 * fixed.c
3 *
4 * Copyright 2008 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
86d9884b
RQ
8 * Copyright (c) 2009 Nokia Corporation
9 * Roger Quadros <ext-roger.quadros@nokia.com>
10 *
4b74ff65
MB
11 * This program is free software; you can redistribute it and/or
12 * modify it under the terms of the GNU General Public License as
13 * published by the Free Software Foundation; either version 2 of the
14 * License, or (at your option) any later version.
15 *
16 * This is useful for systems with mixed controllable and
17 * non-controllable regulators, as well as for allowing testing on
18 * systems with no controllable regulators.
19 */
20
21#include <linux/err.h>
22#include <linux/mutex.h>
65602c32 23#include <linux/module.h>
4b74ff65
MB
24#include <linux/platform_device.h>
25#include <linux/regulator/driver.h>
26#include <linux/regulator/fixed.h>
86d9884b 27#include <linux/gpio.h>
eda79a30 28#include <linux/delay.h>
5a0e3ad6 29#include <linux/slab.h>
cef49102
RN
30#include <linux/of.h>
31#include <linux/of_gpio.h>
32#include <linux/regulator/of_regulator.h>
33#include <linux/regulator/machine.h>
4b74ff65
MB
34
35struct fixed_voltage_data {
36 struct regulator_desc desc;
37 struct regulator_dev *dev;
38 int microvolts;
86d9884b 39 int gpio;
eda79a30 40 unsigned startup_delay;
8ab3343d
DT
41 bool enable_high;
42 bool is_enabled;
4b74ff65
MB
43};
44
cef49102
RN
45
46/**
47 * of_get_fixed_voltage_config - extract fixed_voltage_config structure info
48 * @dev: device requesting for fixed_voltage_config
49 *
50 * Populates fixed_voltage_config structure by extracting data from device
51 * tree node, returns a pointer to the populated structure of NULL if memory
52 * alloc fails.
53 */
54struct fixed_voltage_config *of_get_fixed_voltage_config(struct device *dev)
55{
56 struct fixed_voltage_config *config;
57 struct device_node *np = dev->of_node;
58 const __be32 *delay;
59 struct regulator_init_data *init_data;
60
61 config = devm_kzalloc(dev, sizeof(struct fixed_voltage_config),
62 GFP_KERNEL);
63 if (!config)
64 return NULL;
65
66 config->init_data = of_get_regulator_init_data(dev);
67 init_data = config->init_data;
68
69 config->supply_name = init_data->constraints.name;
70 if (init_data->constraints.min_uV == init_data->constraints.max_uV) {
71 config->microvolts = init_data->constraints.min_uV;
72 } else {
73 dev_err(dev,
74 "Fixed regulator specified with variable voltages\n");
75 return NULL;
76 }
77
78 if (init_data->constraints.boot_on)
79 config->enabled_at_boot = true;
80
81 config->gpio = of_get_named_gpio(np, "gpio", 0);
82 delay = of_get_property(np, "startup-delay-us", NULL);
83 if (delay)
84 config->startup_delay = be32_to_cpu(*delay);
85
86 if (of_find_property(np, "enable-active-high", NULL))
87 config->enable_high = true;
88
89 return config;
90}
91
4b74ff65
MB
92static int fixed_voltage_is_enabled(struct regulator_dev *dev)
93{
86d9884b
RQ
94 struct fixed_voltage_data *data = rdev_get_drvdata(dev);
95
96 return data->is_enabled;
4b74ff65
MB
97}
98
99static int fixed_voltage_enable(struct regulator_dev *dev)
100{
86d9884b
RQ
101 struct fixed_voltage_data *data = rdev_get_drvdata(dev);
102
103 if (gpio_is_valid(data->gpio)) {
104 gpio_set_value_cansleep(data->gpio, data->enable_high);
8ab3343d 105 data->is_enabled = true;
86d9884b
RQ
106 }
107
108 return 0;
109}
110
111static int fixed_voltage_disable(struct regulator_dev *dev)
112{
113 struct fixed_voltage_data *data = rdev_get_drvdata(dev);
114
115 if (gpio_is_valid(data->gpio)) {
116 gpio_set_value_cansleep(data->gpio, !data->enable_high);
8ab3343d 117 data->is_enabled = false;
86d9884b
RQ
118 }
119
4b74ff65
MB
120 return 0;
121}
122
17133dc8
MB
123static int fixed_voltage_enable_time(struct regulator_dev *dev)
124{
125 struct fixed_voltage_data *data = rdev_get_drvdata(dev);
126
127 return data->startup_delay;
128}
129
4b74ff65
MB
130static int fixed_voltage_get_voltage(struct regulator_dev *dev)
131{
132 struct fixed_voltage_data *data = rdev_get_drvdata(dev);
133
134 return data->microvolts;
135}
136
9035cefc
MB
137static int fixed_voltage_list_voltage(struct regulator_dev *dev,
138 unsigned selector)
139{
140 struct fixed_voltage_data *data = rdev_get_drvdata(dev);
141
142 if (selector != 0)
143 return -EINVAL;
144
145 return data->microvolts;
146}
147
4b74ff65
MB
148static struct regulator_ops fixed_voltage_ops = {
149 .is_enabled = fixed_voltage_is_enabled,
150 .enable = fixed_voltage_enable,
86d9884b 151 .disable = fixed_voltage_disable,
17133dc8 152 .enable_time = fixed_voltage_enable_time,
4b74ff65 153 .get_voltage = fixed_voltage_get_voltage,
9035cefc 154 .list_voltage = fixed_voltage_list_voltage,
4b74ff65
MB
155};
156
8ab3343d 157static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev)
4b74ff65
MB
158{
159 struct fixed_voltage_config *config = pdev->dev.platform_data;
160 struct fixed_voltage_data *drvdata;
161 int ret;
162
cef49102
RN
163 if (pdev->dev.of_node)
164 config = of_get_fixed_voltage_config(&pdev->dev);
165
4b74ff65
MB
166 drvdata = kzalloc(sizeof(struct fixed_voltage_data), GFP_KERNEL);
167 if (drvdata == NULL) {
c53ad7fe 168 dev_err(&pdev->dev, "Failed to allocate device data\n");
4b74ff65
MB
169 ret = -ENOMEM;
170 goto err;
171 }
172
173 drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL);
174 if (drvdata->desc.name == NULL) {
c53ad7fe 175 dev_err(&pdev->dev, "Failed to allocate supply name\n");
4b74ff65
MB
176 ret = -ENOMEM;
177 goto err;
178 }
179 drvdata->desc.type = REGULATOR_VOLTAGE;
180 drvdata->desc.owner = THIS_MODULE;
9035cefc
MB
181 drvdata->desc.ops = &fixed_voltage_ops;
182 drvdata->desc.n_voltages = 1;
4b74ff65
MB
183
184 drvdata->microvolts = config->microvolts;
86d9884b 185 drvdata->gpio = config->gpio;
eda79a30 186 drvdata->startup_delay = config->startup_delay;
86d9884b
RQ
187
188 if (gpio_is_valid(config->gpio)) {
189 drvdata->enable_high = config->enable_high;
190
191 /* FIXME: Remove below print warning
192 *
193 * config->gpio must be set to -EINVAL by platform code if
194 * GPIO control is not required. However, early adopters
195 * not requiring GPIO control may forget to initialize
196 * config->gpio to -EINVAL. This will cause GPIO 0 to be used
197 * for GPIO control.
198 *
199 * This warning will be removed once there are a couple of users
200 * for this driver.
201 */
202 if (!config->gpio)
203 dev_warn(&pdev->dev,
204 "using GPIO 0 for regulator enable control\n");
205
206 ret = gpio_request(config->gpio, config->supply_name);
207 if (ret) {
208 dev_err(&pdev->dev,
209 "Could not obtain regulator enable GPIO %d: %d\n",
210 config->gpio, ret);
211 goto err_name;
212 }
213
214 /* set output direction without changing state
215 * to prevent glitch
216 */
217 drvdata->is_enabled = config->enabled_at_boot;
218 ret = drvdata->is_enabled ?
219 config->enable_high : !config->enable_high;
220
221 ret = gpio_direction_output(config->gpio, ret);
222 if (ret) {
223 dev_err(&pdev->dev,
224 "Could not configure regulator enable GPIO %d direction: %d\n",
225 config->gpio, ret);
226 goto err_gpio;
227 }
228
229 } else {
230 /* Regulator without GPIO control is considered
231 * always enabled
232 */
8ab3343d 233 drvdata->is_enabled = true;
86d9884b 234 }
4b74ff65 235
bcf3402c 236 drvdata->dev = regulator_register(&drvdata->desc, &pdev->dev,
2c043bcb 237 config->init_data, drvdata, NULL);
4b74ff65
MB
238 if (IS_ERR(drvdata->dev)) {
239 ret = PTR_ERR(drvdata->dev);
c53ad7fe 240 dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret);
86d9884b 241 goto err_gpio;
4b74ff65
MB
242 }
243
244 platform_set_drvdata(pdev, drvdata);
245
246 dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name,
247 drvdata->microvolts);
248
249 return 0;
250
86d9884b
RQ
251err_gpio:
252 if (gpio_is_valid(config->gpio))
253 gpio_free(config->gpio);
4b74ff65
MB
254err_name:
255 kfree(drvdata->desc.name);
256err:
257 kfree(drvdata);
258 return ret;
259}
260
8ab3343d 261static int __devexit reg_fixed_voltage_remove(struct platform_device *pdev)
4b74ff65
MB
262{
263 struct fixed_voltage_data *drvdata = platform_get_drvdata(pdev);
264
265 regulator_unregister(drvdata->dev);
86d9884b
RQ
266 if (gpio_is_valid(drvdata->gpio))
267 gpio_free(drvdata->gpio);
80099c70
DC
268 kfree(drvdata->desc.name);
269 kfree(drvdata);
86d9884b 270
4b74ff65
MB
271 return 0;
272}
273
cef49102
RN
274#if defined(CONFIG_OF)
275static const struct of_device_id fixed_of_match[] __devinitconst = {
276 { .compatible = "regulator-fixed", },
277 {},
278};
279MODULE_DEVICE_TABLE(of, fixed_of_match);
280#else
281#define fixed_of_match NULL
282#endif
283
4b74ff65 284static struct platform_driver regulator_fixed_voltage_driver = {
8ab3343d
DT
285 .probe = reg_fixed_voltage_probe,
286 .remove = __devexit_p(reg_fixed_voltage_remove),
4b74ff65
MB
287 .driver = {
288 .name = "reg-fixed-voltage",
8ab3343d 289 .owner = THIS_MODULE,
cef49102 290 .of_match_table = fixed_of_match,
4b74ff65
MB
291 },
292};
293
294static int __init regulator_fixed_voltage_init(void)
295{
296 return platform_driver_register(&regulator_fixed_voltage_driver);
297}
5a1b22be 298subsys_initcall(regulator_fixed_voltage_init);
4b74ff65
MB
299
300static void __exit regulator_fixed_voltage_exit(void)
301{
302 platform_driver_unregister(&regulator_fixed_voltage_driver);
303}
304module_exit(regulator_fixed_voltage_exit);
305
306MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
307MODULE_DESCRIPTION("Fixed voltage regulator");
308MODULE_LICENSE("GPL");
38c53c89 309MODULE_ALIAS("platform:reg-fixed-voltage");
This page took 0.271915 seconds and 5 git commands to generate.