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Mark Brown4b74ff62008-04-30 16:27:12 +01001/*
2 * fixed.c
3 *
4 * Copyright 2008 Wolfson Microelectronics PLC.
5 *
6 * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
7 *
Roger Quadros86d98842009-08-06 19:37:29 +03008 * Copyright (c) 2009 Nokia Corporation
9 * Roger Quadros <ext-roger.quadros@nokia.com>
10 *
Mark Brown4b74ff62008-04-30 16:27:12 +010011 * 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>
Paul Gortmaker65602c32011-07-17 16:28:23 -040023#include <linux/module.h>
Mark Brown4b74ff62008-04-30 16:27:12 +010024#include <linux/platform_device.h>
25#include <linux/regulator/driver.h>
26#include <linux/regulator/fixed.h>
Roger Quadros86d98842009-08-06 19:37:29 +030027#include <linux/gpio.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090028#include <linux/slab.h>
Rajendra Nayakcef49102011-11-18 16:47:18 +053029#include <linux/of.h>
30#include <linux/of_gpio.h>
31#include <linux/regulator/of_regulator.h>
32#include <linux/regulator/machine.h>
Mark Brown4b74ff62008-04-30 16:27:12 +010033
34struct fixed_voltage_data {
35 struct regulator_desc desc;
36 struct regulator_dev *dev;
37 int microvolts;
38};
39
Rajendra Nayakcef49102011-11-18 16:47:18 +053040
41/**
42 * of_get_fixed_voltage_config - extract fixed_voltage_config structure info
43 * @dev: device requesting for fixed_voltage_config
44 *
45 * Populates fixed_voltage_config structure by extracting data from device
46 * tree node, returns a pointer to the populated structure of NULL if memory
47 * alloc fails.
48 */
Axel Linbc913962011-11-27 10:35:08 +080049static struct fixed_voltage_config *
50of_get_fixed_voltage_config(struct device *dev)
Rajendra Nayakcef49102011-11-18 16:47:18 +053051{
52 struct fixed_voltage_config *config;
53 struct device_node *np = dev->of_node;
54 const __be32 *delay;
55 struct regulator_init_data *init_data;
56
57 config = devm_kzalloc(dev, sizeof(struct fixed_voltage_config),
58 GFP_KERNEL);
59 if (!config)
Stephen Warrenf1418222012-06-29 10:33:15 -060060 return ERR_PTR(-ENOMEM);
Rajendra Nayakcef49102011-11-18 16:47:18 +053061
Shawn Guod9a861c2011-12-01 17:21:06 +080062 config->init_data = of_get_regulator_init_data(dev, dev->of_node);
Axel Lin4b864af2011-11-26 20:19:19 +080063 if (!config->init_data)
Stephen Warrenf1418222012-06-29 10:33:15 -060064 return ERR_PTR(-EINVAL);
Axel Lin4b864af2011-11-26 20:19:19 +080065
Rajendra Nayakcef49102011-11-18 16:47:18 +053066 init_data = config->init_data;
Richard Zhao0c437c42012-01-04 11:07:29 +080067 init_data->constraints.apply_uV = 0;
Rajendra Nayakcef49102011-11-18 16:47:18 +053068
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");
Stephen Warrenf1418222012-06-29 10:33:15 -060075 return ERR_PTR(-EINVAL);
Rajendra Nayakcef49102011-11-18 16:47:18 +053076 }
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);
Stephen Warrenf1418222012-06-29 10:33:15 -060082 /*
83 * of_get_named_gpio() currently returns ENODEV rather than
84 * EPROBE_DEFER. This code attempts to be compatible with both
85 * for now; the ENODEV check can be removed once the API is fixed.
86 * of_get_named_gpio() doesn't differentiate between a missing
87 * property (which would be fine here, since the GPIO is optional)
88 * and some other error. Patches have been posted for both issues.
89 * Once they are check in, we should replace this with:
90 * if (config->gpio < 0 && config->gpio != -ENOENT)
91 */
92 if ((config->gpio == -ENODEV) || (config->gpio == -EPROBE_DEFER))
93 return ERR_PTR(-EPROBE_DEFER);
94
Rajendra Nayakcef49102011-11-18 16:47:18 +053095 delay = of_get_property(np, "startup-delay-us", NULL);
96 if (delay)
97 config->startup_delay = be32_to_cpu(*delay);
98
99 if (of_find_property(np, "enable-active-high", NULL))
100 config->enable_high = true;
101
Laxman Dewangan9a50dba2012-05-07 15:58:19 +0530102 if (of_find_property(np, "gpio-open-drain", NULL))
103 config->gpio_is_open_drain = true;
104
Laxman Dewangan6be5bfc2012-07-05 18:12:01 +0530105 if (of_find_property(np, "vin-supply", NULL))
106 config->input_supply = "vin";
107
Rajendra Nayakcef49102011-11-18 16:47:18 +0530108 return config;
109}
110
Mark Brown4b74ff62008-04-30 16:27:12 +0100111static int fixed_voltage_get_voltage(struct regulator_dev *dev)
112{
113 struct fixed_voltage_data *data = rdev_get_drvdata(dev);
114
Mark Brownaebe4952011-11-02 11:38:45 +0000115 if (data->microvolts)
116 return data->microvolts;
117 else
118 return -EINVAL;
Mark Brown4b74ff62008-04-30 16:27:12 +0100119}
120
Mark Brown9035cef2009-04-28 11:13:54 +0100121static int fixed_voltage_list_voltage(struct regulator_dev *dev,
122 unsigned selector)
123{
124 struct fixed_voltage_data *data = rdev_get_drvdata(dev);
125
126 if (selector != 0)
127 return -EINVAL;
128
129 return data->microvolts;
130}
131
Mark Brown9d442062012-03-21 20:04:44 +0000132static struct regulator_ops fixed_voltage_ops = {
133 .get_voltage = fixed_voltage_get_voltage,
134 .list_voltage = fixed_voltage_list_voltage,
135};
136
Dmitry Torokhov8ab33432010-02-23 23:37:55 -0800137static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev)
Mark Brown4b74ff62008-04-30 16:27:12 +0100138{
Axel Lin22d881c2011-11-27 20:07:57 +0800139 struct fixed_voltage_config *config;
Mark Brown4b74ff62008-04-30 16:27:12 +0100140 struct fixed_voltage_data *drvdata;
Mark Brownc1727082012-04-04 00:50:22 +0100141 struct regulator_config cfg = { };
Mark Brown4b74ff62008-04-30 16:27:12 +0100142 int ret;
143
Stephen Warrenf1418222012-06-29 10:33:15 -0600144 if (pdev->dev.of_node) {
Rajendra Nayakcef49102011-11-18 16:47:18 +0530145 config = of_get_fixed_voltage_config(&pdev->dev);
Stephen Warrenf1418222012-06-29 10:33:15 -0600146 if (IS_ERR(config))
147 return PTR_ERR(config);
148 } else {
Axel Lin22d881c2011-11-27 20:07:57 +0800149 config = pdev->dev.platform_data;
Stephen Warrenf1418222012-06-29 10:33:15 -0600150 }
Axel Lin22d881c2011-11-27 20:07:57 +0800151
152 if (!config)
153 return -ENOMEM;
Rajendra Nayakcef49102011-11-18 16:47:18 +0530154
Mark Brownc45bb352012-03-21 18:13:29 +0000155 drvdata = devm_kzalloc(&pdev->dev, sizeof(struct fixed_voltage_data),
156 GFP_KERNEL);
Mark Brown4b74ff62008-04-30 16:27:12 +0100157 if (drvdata == NULL) {
Mark Brownc53ad7f2009-08-03 18:49:53 +0100158 dev_err(&pdev->dev, "Failed to allocate device data\n");
Mark Brown4b74ff62008-04-30 16:27:12 +0100159 ret = -ENOMEM;
160 goto err;
161 }
162
163 drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL);
164 if (drvdata->desc.name == NULL) {
Mark Brownc53ad7f2009-08-03 18:49:53 +0100165 dev_err(&pdev->dev, "Failed to allocate supply name\n");
Mark Brown4b74ff62008-04-30 16:27:12 +0100166 ret = -ENOMEM;
167 goto err;
168 }
169 drvdata->desc.type = REGULATOR_VOLTAGE;
170 drvdata->desc.owner = THIS_MODULE;
Mark Brown25a53df2012-06-27 14:30:33 +0100171 drvdata->desc.ops = &fixed_voltage_ops;
Sascha Hauer1c37f8a2012-03-03 12:40:01 +0100172
Mark Brown3d0f2672012-06-27 14:27:22 +0100173 drvdata->desc.enable_time = config->startup_delay;
174
Laxman Dewangan6be5bfc2012-07-05 18:12:01 +0530175 if (config->input_supply) {
176 drvdata->desc.supply_name = kstrdup(config->input_supply,
177 GFP_KERNEL);
178 if (!drvdata->desc.supply_name) {
179 dev_err(&pdev->dev,
180 "Failed to allocate input supply\n");
181 ret = -ENOMEM;
182 goto err_name;
183 }
184 }
185
Sascha Hauer1c37f8a2012-03-03 12:40:01 +0100186 if (config->microvolts)
187 drvdata->desc.n_voltages = 1;
Mark Brown4b74ff62008-04-30 16:27:12 +0100188
189 drvdata->microvolts = config->microvolts;
Roger Quadros86d98842009-08-06 19:37:29 +0300190
Mark Brown25a53df2012-06-27 14:30:33 +0100191 if (config->gpio >= 0)
192 cfg.ena_gpio = config->gpio;
193 cfg.ena_gpio_invert = !config->enable_high;
194 if (config->enabled_at_boot) {
195 if (config->enable_high) {
196 cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
197 } else {
198 cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
Roger Quadros86d98842009-08-06 19:37:29 +0300199 }
Roger Quadros86d98842009-08-06 19:37:29 +0300200 } else {
Mark Brown25a53df2012-06-27 14:30:33 +0100201 if (config->enable_high) {
202 cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
203 } else {
204 cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
205 }
Roger Quadros86d98842009-08-06 19:37:29 +0300206 }
Mark Brown25a53df2012-06-27 14:30:33 +0100207 if (config->gpio_is_open_drain)
208 cfg.ena_gpio_flags |= GPIOF_OPEN_DRAIN;
Mark Brown4b74ff62008-04-30 16:27:12 +0100209
Mark Brownc1727082012-04-04 00:50:22 +0100210 cfg.dev = &pdev->dev;
211 cfg.init_data = config->init_data;
212 cfg.driver_data = drvdata;
213 cfg.of_node = pdev->dev.of_node;
214
215 drvdata->dev = regulator_register(&drvdata->desc, &cfg);
Mark Brown4b74ff62008-04-30 16:27:12 +0100216 if (IS_ERR(drvdata->dev)) {
217 ret = PTR_ERR(drvdata->dev);
Mark Brownc53ad7f2009-08-03 18:49:53 +0100218 dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret);
Laxman Dewangan6be5bfc2012-07-05 18:12:01 +0530219 goto err_input;
Mark Brown4b74ff62008-04-30 16:27:12 +0100220 }
221
222 platform_set_drvdata(pdev, drvdata);
223
224 dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name,
225 drvdata->microvolts);
226
227 return 0;
228
Laxman Dewangan6be5bfc2012-07-05 18:12:01 +0530229err_input:
230 kfree(drvdata->desc.supply_name);
Mark Brown4b74ff62008-04-30 16:27:12 +0100231err_name:
232 kfree(drvdata->desc.name);
233err:
Mark Brown4b74ff62008-04-30 16:27:12 +0100234 return ret;
235}
236
Dmitry Torokhov8ab33432010-02-23 23:37:55 -0800237static int __devexit reg_fixed_voltage_remove(struct platform_device *pdev)
Mark Brown4b74ff62008-04-30 16:27:12 +0100238{
239 struct fixed_voltage_data *drvdata = platform_get_drvdata(pdev);
240
241 regulator_unregister(drvdata->dev);
Laxman Dewangan6be5bfc2012-07-05 18:12:01 +0530242 kfree(drvdata->desc.supply_name);
Dan Carpenter80099c72009-11-16 11:05:03 +0200243 kfree(drvdata->desc.name);
Roger Quadros86d98842009-08-06 19:37:29 +0300244
Mark Brown4b74ff62008-04-30 16:27:12 +0100245 return 0;
246}
247
Rajendra Nayakcef49102011-11-18 16:47:18 +0530248#if defined(CONFIG_OF)
249static const struct of_device_id fixed_of_match[] __devinitconst = {
250 { .compatible = "regulator-fixed", },
251 {},
252};
253MODULE_DEVICE_TABLE(of, fixed_of_match);
Rajendra Nayakcef49102011-11-18 16:47:18 +0530254#endif
255
Mark Brown4b74ff62008-04-30 16:27:12 +0100256static struct platform_driver regulator_fixed_voltage_driver = {
Dmitry Torokhov8ab33432010-02-23 23:37:55 -0800257 .probe = reg_fixed_voltage_probe,
258 .remove = __devexit_p(reg_fixed_voltage_remove),
Mark Brown4b74ff62008-04-30 16:27:12 +0100259 .driver = {
260 .name = "reg-fixed-voltage",
Dmitry Torokhov8ab33432010-02-23 23:37:55 -0800261 .owner = THIS_MODULE,
Axel Linabcfaf22012-06-01 12:16:25 +0800262 .of_match_table = of_match_ptr(fixed_of_match),
Mark Brown4b74ff62008-04-30 16:27:12 +0100263 },
264};
265
266static int __init regulator_fixed_voltage_init(void)
267{
268 return platform_driver_register(&regulator_fixed_voltage_driver);
269}
Mark Brown5a1b22b2009-04-27 18:21:18 +0100270subsys_initcall(regulator_fixed_voltage_init);
Mark Brown4b74ff62008-04-30 16:27:12 +0100271
272static void __exit regulator_fixed_voltage_exit(void)
273{
274 platform_driver_unregister(&regulator_fixed_voltage_driver);
275}
276module_exit(regulator_fixed_voltage_exit);
277
278MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
279MODULE_DESCRIPTION("Fixed voltage regulator");
280MODULE_LICENSE("GPL");
Mark Brown38c53c82009-04-28 11:13:55 +0100281MODULE_ALIAS("platform:reg-fixed-voltage");