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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;
Mark Brown4b74ff62008-04-30 16:27:12 +010037};
38
Rajendra Nayakcef49102011-11-18 16:47:18 +053039
40/**
41 * of_get_fixed_voltage_config - extract fixed_voltage_config structure info
42 * @dev: device requesting for fixed_voltage_config
Javier Martinez Canillas072e78b2014-11-10 14:43:53 +010043 * @desc: regulator description
Rajendra Nayakcef49102011-11-18 16:47:18 +053044 *
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 *
Javier Martinez Canillas072e78b2014-11-10 14:43:53 +010050of_get_fixed_voltage_config(struct device *dev,
51 const struct regulator_desc *desc)
Rajendra Nayakcef49102011-11-18 16:47:18 +053052{
53 struct fixed_voltage_config *config;
54 struct device_node *np = dev->of_node;
Rajendra Nayakcef49102011-11-18 16:47:18 +053055 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
Javier Martinez Canillas072e78b2014-11-10 14:43:53 +010062 config->init_data = of_get_regulator_init_data(dev, dev->of_node, desc);
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
Sergei Shtylyov4127f692014-05-25 23:50:39 +040095 of_property_read_u32(np, "startup-delay-us", &config->startup_delay);
Rajendra Nayakcef49102011-11-18 16:47:18 +053096
Sergei Shtylyov4127f692014-05-25 23:50:39 +040097 config->enable_high = of_property_read_bool(np, "enable-active-high");
98 config->gpio_is_open_drain = of_property_read_bool(np,
99 "gpio-open-drain");
Laxman Dewangan9a50dba2012-05-07 15:58:19 +0530100
Laxman Dewangan6be5bfc2012-07-05 18:12:01 +0530101 if (of_find_property(np, "vin-supply", NULL))
102 config->input_supply = "vin";
103
Rajendra Nayakcef49102011-11-18 16:47:18 +0530104 return config;
105}
106
Mark Brown9d442062012-03-21 20:04:44 +0000107static struct regulator_ops fixed_voltage_ops = {
Mark Brown9d442062012-03-21 20:04:44 +0000108};
109
Bill Pembertona5023572012-11-19 13:22:22 -0500110static int reg_fixed_voltage_probe(struct platform_device *pdev)
Mark Brown4b74ff62008-04-30 16:27:12 +0100111{
Axel Lin22d881c2011-11-27 20:07:57 +0800112 struct fixed_voltage_config *config;
Mark Brown4b74ff62008-04-30 16:27:12 +0100113 struct fixed_voltage_data *drvdata;
Mark Brownc1727082012-04-04 00:50:22 +0100114 struct regulator_config cfg = { };
Mark Brown4b74ff62008-04-30 16:27:12 +0100115 int ret;
116
Javier Martinez Canillas072e78b2014-11-10 14:43:53 +0100117 drvdata = devm_kzalloc(&pdev->dev, sizeof(struct fixed_voltage_data),
118 GFP_KERNEL);
119 if (!drvdata)
120 return -ENOMEM;
121
Stephen Warrenf1418222012-06-29 10:33:15 -0600122 if (pdev->dev.of_node) {
Javier Martinez Canillas072e78b2014-11-10 14:43:53 +0100123 config = of_get_fixed_voltage_config(&pdev->dev,
124 &drvdata->desc);
Stephen Warrenf1418222012-06-29 10:33:15 -0600125 if (IS_ERR(config))
126 return PTR_ERR(config);
127 } else {
Jingoo Handff91d02013-07-30 17:20:47 +0900128 config = dev_get_platdata(&pdev->dev);
Stephen Warrenf1418222012-06-29 10:33:15 -0600129 }
Axel Lin22d881c2011-11-27 20:07:57 +0800130
131 if (!config)
132 return -ENOMEM;
Rajendra Nayakcef49102011-11-18 16:47:18 +0530133
Manish Badarkhe84d0ffb2014-01-29 20:27:28 +0530134 drvdata->desc.name = devm_kstrdup(&pdev->dev,
135 config->supply_name,
136 GFP_KERNEL);
Mark Brown4b74ff62008-04-30 16:27:12 +0100137 if (drvdata->desc.name == NULL) {
Mark Brownc53ad7f2009-08-03 18:49:53 +0100138 dev_err(&pdev->dev, "Failed to allocate supply name\n");
Manish Badarkhe84d0ffb2014-01-29 20:27:28 +0530139 return -ENOMEM;
Mark Brown4b74ff62008-04-30 16:27:12 +0100140 }
141 drvdata->desc.type = REGULATOR_VOLTAGE;
142 drvdata->desc.owner = THIS_MODULE;
Mark Brown25a53df2012-06-27 14:30:33 +0100143 drvdata->desc.ops = &fixed_voltage_ops;
Sascha Hauer1c37f8a2012-03-03 12:40:01 +0100144
Mark Brown3d0f2672012-06-27 14:27:22 +0100145 drvdata->desc.enable_time = config->startup_delay;
146
Laxman Dewangan6be5bfc2012-07-05 18:12:01 +0530147 if (config->input_supply) {
Manish Badarkhe84d0ffb2014-01-29 20:27:28 +0530148 drvdata->desc.supply_name = devm_kstrdup(&pdev->dev,
149 config->input_supply,
150 GFP_KERNEL);
Laxman Dewangan6be5bfc2012-07-05 18:12:01 +0530151 if (!drvdata->desc.supply_name) {
152 dev_err(&pdev->dev,
153 "Failed to allocate input supply\n");
Manish Badarkhe84d0ffb2014-01-29 20:27:28 +0530154 return -ENOMEM;
Laxman Dewangan6be5bfc2012-07-05 18:12:01 +0530155 }
156 }
157
Sascha Hauer1c37f8a2012-03-03 12:40:01 +0100158 if (config->microvolts)
159 drvdata->desc.n_voltages = 1;
Mark Brown4b74ff62008-04-30 16:27:12 +0100160
Laxman Dewanganc368e5f2013-09-10 15:45:06 +0530161 drvdata->desc.fixed_uV = config->microvolts;
Roger Quadros86d98842009-08-06 19:37:29 +0300162
Markus Pargmann5315fe22014-11-03 19:12:05 +0100163 if (gpio_is_valid(config->gpio)) {
Mark Brown25a53df2012-06-27 14:30:33 +0100164 cfg.ena_gpio = config->gpio;
Markus Pargmann1de38212014-11-03 19:12:04 +0100165 if (pdev->dev.of_node)
166 cfg.ena_gpio_initialized = true;
167 }
Mark Brown25a53df2012-06-27 14:30:33 +0100168 cfg.ena_gpio_invert = !config->enable_high;
169 if (config->enabled_at_boot) {
Jingoo Han609d5f62013-10-14 17:46:36 +0900170 if (config->enable_high)
Mark Brown25a53df2012-06-27 14:30:33 +0100171 cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
Jingoo Han609d5f62013-10-14 17:46:36 +0900172 else
Mark Brown25a53df2012-06-27 14:30:33 +0100173 cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
Roger Quadros86d98842009-08-06 19:37:29 +0300174 } else {
Jingoo Han609d5f62013-10-14 17:46:36 +0900175 if (config->enable_high)
Mark Brown25a53df2012-06-27 14:30:33 +0100176 cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
Jingoo Han609d5f62013-10-14 17:46:36 +0900177 else
Mark Brown25a53df2012-06-27 14:30:33 +0100178 cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
Roger Quadros86d98842009-08-06 19:37:29 +0300179 }
Mark Brown25a53df2012-06-27 14:30:33 +0100180 if (config->gpio_is_open_drain)
181 cfg.ena_gpio_flags |= GPIOF_OPEN_DRAIN;
Mark Brown4b74ff62008-04-30 16:27:12 +0100182
Mark Brownc1727082012-04-04 00:50:22 +0100183 cfg.dev = &pdev->dev;
184 cfg.init_data = config->init_data;
185 cfg.driver_data = drvdata;
186 cfg.of_node = pdev->dev.of_node;
187
Manish Badarkhe84d0ffb2014-01-29 20:27:28 +0530188 drvdata->dev = devm_regulator_register(&pdev->dev, &drvdata->desc,
189 &cfg);
Mark Brown4b74ff62008-04-30 16:27:12 +0100190 if (IS_ERR(drvdata->dev)) {
191 ret = PTR_ERR(drvdata->dev);
Mark Brownc53ad7f2009-08-03 18:49:53 +0100192 dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret);
Manish Badarkhe84d0ffb2014-01-29 20:27:28 +0530193 return ret;
Mark Brown4b74ff62008-04-30 16:27:12 +0100194 }
195
196 platform_set_drvdata(pdev, drvdata);
197
198 dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name,
Laxman Dewanganc368e5f2013-09-10 15:45:06 +0530199 drvdata->desc.fixed_uV);
Mark Brown4b74ff62008-04-30 16:27:12 +0100200
201 return 0;
Mark Brown4b74ff62008-04-30 16:27:12 +0100202}
203
Rajendra Nayakcef49102011-11-18 16:47:18 +0530204#if defined(CONFIG_OF)
Greg Kroah-Hartman3d68dfe2012-12-21 13:26:06 -0800205static const struct of_device_id fixed_of_match[] = {
Rajendra Nayakcef49102011-11-18 16:47:18 +0530206 { .compatible = "regulator-fixed", },
207 {},
208};
209MODULE_DEVICE_TABLE(of, fixed_of_match);
Rajendra Nayakcef49102011-11-18 16:47:18 +0530210#endif
211
Mark Brown4b74ff62008-04-30 16:27:12 +0100212static struct platform_driver regulator_fixed_voltage_driver = {
Dmitry Torokhov8ab33432010-02-23 23:37:55 -0800213 .probe = reg_fixed_voltage_probe,
Mark Brown4b74ff62008-04-30 16:27:12 +0100214 .driver = {
215 .name = "reg-fixed-voltage",
Axel Linabcfaf22012-06-01 12:16:25 +0800216 .of_match_table = of_match_ptr(fixed_of_match),
Mark Brown4b74ff62008-04-30 16:27:12 +0100217 },
218};
219
220static int __init regulator_fixed_voltage_init(void)
221{
222 return platform_driver_register(&regulator_fixed_voltage_driver);
223}
Mark Brown5a1b22b2009-04-27 18:21:18 +0100224subsys_initcall(regulator_fixed_voltage_init);
Mark Brown4b74ff62008-04-30 16:27:12 +0100225
226static void __exit regulator_fixed_voltage_exit(void)
227{
228 platform_driver_unregister(&regulator_fixed_voltage_driver);
229}
230module_exit(regulator_fixed_voltage_exit);
231
232MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
233MODULE_DESCRIPTION("Fixed voltage regulator");
234MODULE_LICENSE("GPL");
Mark Brown38c53c82009-04-28 11:13:55 +0100235MODULE_ALIAS("platform:reg-fixed-voltage");