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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
43 *
44 * Populates fixed_voltage_config structure by extracting data from device
45 * tree node, returns a pointer to the populated structure of NULL if memory
46 * alloc fails.
47 */
Axel Linbc913962011-11-27 10:35:08 +080048static struct fixed_voltage_config *
49of_get_fixed_voltage_config(struct device *dev)
Rajendra Nayakcef49102011-11-18 16:47:18 +053050{
51 struct fixed_voltage_config *config;
52 struct device_node *np = dev->of_node;
Rajendra Nayakcef49102011-11-18 16:47:18 +053053 struct regulator_init_data *init_data;
54
55 config = devm_kzalloc(dev, sizeof(struct fixed_voltage_config),
56 GFP_KERNEL);
57 if (!config)
Stephen Warrenf1418222012-06-29 10:33:15 -060058 return ERR_PTR(-ENOMEM);
Rajendra Nayakcef49102011-11-18 16:47:18 +053059
Shawn Guod9a861c2011-12-01 17:21:06 +080060 config->init_data = of_get_regulator_init_data(dev, dev->of_node);
Axel Lin4b864af2011-11-26 20:19:19 +080061 if (!config->init_data)
Stephen Warrenf1418222012-06-29 10:33:15 -060062 return ERR_PTR(-EINVAL);
Axel Lin4b864af2011-11-26 20:19:19 +080063
Rajendra Nayakcef49102011-11-18 16:47:18 +053064 init_data = config->init_data;
Richard Zhao0c437c42012-01-04 11:07:29 +080065 init_data->constraints.apply_uV = 0;
Rajendra Nayakcef49102011-11-18 16:47:18 +053066
67 config->supply_name = init_data->constraints.name;
68 if (init_data->constraints.min_uV == init_data->constraints.max_uV) {
69 config->microvolts = init_data->constraints.min_uV;
70 } else {
71 dev_err(dev,
72 "Fixed regulator specified with variable voltages\n");
Stephen Warrenf1418222012-06-29 10:33:15 -060073 return ERR_PTR(-EINVAL);
Rajendra Nayakcef49102011-11-18 16:47:18 +053074 }
75
76 if (init_data->constraints.boot_on)
77 config->enabled_at_boot = true;
78
79 config->gpio = of_get_named_gpio(np, "gpio", 0);
Stephen Warrenf1418222012-06-29 10:33:15 -060080 /*
81 * of_get_named_gpio() currently returns ENODEV rather than
82 * EPROBE_DEFER. This code attempts to be compatible with both
83 * for now; the ENODEV check can be removed once the API is fixed.
84 * of_get_named_gpio() doesn't differentiate between a missing
85 * property (which would be fine here, since the GPIO is optional)
86 * and some other error. Patches have been posted for both issues.
87 * Once they are check in, we should replace this with:
88 * if (config->gpio < 0 && config->gpio != -ENOENT)
89 */
90 if ((config->gpio == -ENODEV) || (config->gpio == -EPROBE_DEFER))
91 return ERR_PTR(-EPROBE_DEFER);
92
Sergei Shtylyov4127f692014-05-25 23:50:39 +040093 of_property_read_u32(np, "startup-delay-us", &config->startup_delay);
Rajendra Nayakcef49102011-11-18 16:47:18 +053094
Sergei Shtylyov4127f692014-05-25 23:50:39 +040095 config->enable_high = of_property_read_bool(np, "enable-active-high");
96 config->gpio_is_open_drain = of_property_read_bool(np,
97 "gpio-open-drain");
Laxman Dewangan9a50dba2012-05-07 15:58:19 +053098
Laxman Dewangan6be5bfc2012-07-05 18:12:01 +053099 if (of_find_property(np, "vin-supply", NULL))
100 config->input_supply = "vin";
101
Rajendra Nayakcef49102011-11-18 16:47:18 +0530102 return config;
103}
104
Mark Brown9d442062012-03-21 20:04:44 +0000105static struct regulator_ops fixed_voltage_ops = {
Mark Brown9d442062012-03-21 20:04:44 +0000106};
107
Bill Pembertona5023572012-11-19 13:22:22 -0500108static int reg_fixed_voltage_probe(struct platform_device *pdev)
Mark Brown4b74ff62008-04-30 16:27:12 +0100109{
Axel Lin22d881c2011-11-27 20:07:57 +0800110 struct fixed_voltage_config *config;
Mark Brown4b74ff62008-04-30 16:27:12 +0100111 struct fixed_voltage_data *drvdata;
Mark Brownc1727082012-04-04 00:50:22 +0100112 struct regulator_config cfg = { };
Mark Brown4b74ff62008-04-30 16:27:12 +0100113 int ret;
114
Stephen Warrenf1418222012-06-29 10:33:15 -0600115 if (pdev->dev.of_node) {
Rajendra Nayakcef49102011-11-18 16:47:18 +0530116 config = of_get_fixed_voltage_config(&pdev->dev);
Stephen Warrenf1418222012-06-29 10:33:15 -0600117 if (IS_ERR(config))
118 return PTR_ERR(config);
119 } else {
Jingoo Handff91d02013-07-30 17:20:47 +0900120 config = dev_get_platdata(&pdev->dev);
Stephen Warrenf1418222012-06-29 10:33:15 -0600121 }
Axel Lin22d881c2011-11-27 20:07:57 +0800122
123 if (!config)
124 return -ENOMEM;
Rajendra Nayakcef49102011-11-18 16:47:18 +0530125
Mark Brownc45bb352012-03-21 18:13:29 +0000126 drvdata = devm_kzalloc(&pdev->dev, sizeof(struct fixed_voltage_data),
127 GFP_KERNEL);
Sachin Kamatf1b3f902014-02-20 14:23:05 +0530128 if (!drvdata)
Manish Badarkhe84d0ffb2014-01-29 20:27:28 +0530129 return -ENOMEM;
Mark Brown4b74ff62008-04-30 16:27:12 +0100130
Manish Badarkhe84d0ffb2014-01-29 20:27:28 +0530131 drvdata->desc.name = devm_kstrdup(&pdev->dev,
132 config->supply_name,
133 GFP_KERNEL);
Mark Brown4b74ff62008-04-30 16:27:12 +0100134 if (drvdata->desc.name == NULL) {
Mark Brownc53ad7f2009-08-03 18:49:53 +0100135 dev_err(&pdev->dev, "Failed to allocate supply name\n");
Manish Badarkhe84d0ffb2014-01-29 20:27:28 +0530136 return -ENOMEM;
Mark Brown4b74ff62008-04-30 16:27:12 +0100137 }
138 drvdata->desc.type = REGULATOR_VOLTAGE;
139 drvdata->desc.owner = THIS_MODULE;
Mark Brown25a53df2012-06-27 14:30:33 +0100140 drvdata->desc.ops = &fixed_voltage_ops;
Sascha Hauer1c37f8a2012-03-03 12:40:01 +0100141
Mark Brown3d0f2672012-06-27 14:27:22 +0100142 drvdata->desc.enable_time = config->startup_delay;
143
Laxman Dewangan6be5bfc2012-07-05 18:12:01 +0530144 if (config->input_supply) {
Manish Badarkhe84d0ffb2014-01-29 20:27:28 +0530145 drvdata->desc.supply_name = devm_kstrdup(&pdev->dev,
146 config->input_supply,
147 GFP_KERNEL);
Laxman Dewangan6be5bfc2012-07-05 18:12:01 +0530148 if (!drvdata->desc.supply_name) {
149 dev_err(&pdev->dev,
150 "Failed to allocate input supply\n");
Manish Badarkhe84d0ffb2014-01-29 20:27:28 +0530151 return -ENOMEM;
Laxman Dewangan6be5bfc2012-07-05 18:12:01 +0530152 }
153 }
154
Sascha Hauer1c37f8a2012-03-03 12:40:01 +0100155 if (config->microvolts)
156 drvdata->desc.n_voltages = 1;
Mark Brown4b74ff62008-04-30 16:27:12 +0100157
Laxman Dewanganc368e5f2013-09-10 15:45:06 +0530158 drvdata->desc.fixed_uV = config->microvolts;
Roger Quadros86d98842009-08-06 19:37:29 +0300159
Mark Brown25a53df2012-06-27 14:30:33 +0100160 if (config->gpio >= 0)
161 cfg.ena_gpio = config->gpio;
162 cfg.ena_gpio_invert = !config->enable_high;
163 if (config->enabled_at_boot) {
Jingoo Han609d5f62013-10-14 17:46:36 +0900164 if (config->enable_high)
Mark Brown25a53df2012-06-27 14:30:33 +0100165 cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
Jingoo Han609d5f62013-10-14 17:46:36 +0900166 else
Mark Brown25a53df2012-06-27 14:30:33 +0100167 cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
Roger Quadros86d98842009-08-06 19:37:29 +0300168 } else {
Jingoo Han609d5f62013-10-14 17:46:36 +0900169 if (config->enable_high)
Mark Brown25a53df2012-06-27 14:30:33 +0100170 cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW;
Jingoo Han609d5f62013-10-14 17:46:36 +0900171 else
Mark Brown25a53df2012-06-27 14:30:33 +0100172 cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH;
Roger Quadros86d98842009-08-06 19:37:29 +0300173 }
Mark Brown25a53df2012-06-27 14:30:33 +0100174 if (config->gpio_is_open_drain)
175 cfg.ena_gpio_flags |= GPIOF_OPEN_DRAIN;
Mark Brown4b74ff62008-04-30 16:27:12 +0100176
Mark Brownc1727082012-04-04 00:50:22 +0100177 cfg.dev = &pdev->dev;
178 cfg.init_data = config->init_data;
179 cfg.driver_data = drvdata;
180 cfg.of_node = pdev->dev.of_node;
181
Manish Badarkhe84d0ffb2014-01-29 20:27:28 +0530182 drvdata->dev = devm_regulator_register(&pdev->dev, &drvdata->desc,
183 &cfg);
Mark Brown4b74ff62008-04-30 16:27:12 +0100184 if (IS_ERR(drvdata->dev)) {
185 ret = PTR_ERR(drvdata->dev);
Mark Brownc53ad7f2009-08-03 18:49:53 +0100186 dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret);
Manish Badarkhe84d0ffb2014-01-29 20:27:28 +0530187 return ret;
Mark Brown4b74ff62008-04-30 16:27:12 +0100188 }
189
190 platform_set_drvdata(pdev, drvdata);
191
192 dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name,
Laxman Dewanganc368e5f2013-09-10 15:45:06 +0530193 drvdata->desc.fixed_uV);
Mark Brown4b74ff62008-04-30 16:27:12 +0100194
195 return 0;
Mark Brown4b74ff62008-04-30 16:27:12 +0100196}
197
Rajendra Nayakcef49102011-11-18 16:47:18 +0530198#if defined(CONFIG_OF)
Greg Kroah-Hartman3d68dfe2012-12-21 13:26:06 -0800199static const struct of_device_id fixed_of_match[] = {
Rajendra Nayakcef49102011-11-18 16:47:18 +0530200 { .compatible = "regulator-fixed", },
201 {},
202};
203MODULE_DEVICE_TABLE(of, fixed_of_match);
Rajendra Nayakcef49102011-11-18 16:47:18 +0530204#endif
205
Mark Brown4b74ff62008-04-30 16:27:12 +0100206static struct platform_driver regulator_fixed_voltage_driver = {
Dmitry Torokhov8ab33432010-02-23 23:37:55 -0800207 .probe = reg_fixed_voltage_probe,
Mark Brown4b74ff62008-04-30 16:27:12 +0100208 .driver = {
209 .name = "reg-fixed-voltage",
Dmitry Torokhov8ab33432010-02-23 23:37:55 -0800210 .owner = THIS_MODULE,
Axel Linabcfaf22012-06-01 12:16:25 +0800211 .of_match_table = of_match_ptr(fixed_of_match),
Mark Brown4b74ff62008-04-30 16:27:12 +0100212 },
213};
214
215static int __init regulator_fixed_voltage_init(void)
216{
217 return platform_driver_register(&regulator_fixed_voltage_driver);
218}
Mark Brown5a1b22b2009-04-27 18:21:18 +0100219subsys_initcall(regulator_fixed_voltage_init);
Mark Brown4b74ff62008-04-30 16:27:12 +0100220
221static void __exit regulator_fixed_voltage_exit(void)
222{
223 platform_driver_unregister(&regulator_fixed_voltage_driver);
224}
225module_exit(regulator_fixed_voltage_exit);
226
227MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>");
228MODULE_DESCRIPTION("Fixed voltage regulator");
229MODULE_LICENSE("GPL");
Mark Brown38c53c82009-04-28 11:13:55 +0100230MODULE_ALIAS("platform:reg-fixed-voltage");