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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> | |
23 | #include <linux/platform_device.h> | |
24 | #include <linux/regulator/driver.h> | |
25 | #include <linux/regulator/fixed.h> | |
86d9884b | 26 | #include <linux/gpio.h> |
eda79a30 | 27 | #include <linux/delay.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
4b74ff65 MB |
29 | |
30 | struct fixed_voltage_data { | |
31 | struct regulator_desc desc; | |
32 | struct regulator_dev *dev; | |
33 | int microvolts; | |
86d9884b | 34 | int gpio; |
eda79a30 | 35 | unsigned startup_delay; |
8ab3343d DT |
36 | bool enable_high; |
37 | bool is_enabled; | |
4b74ff65 MB |
38 | }; |
39 | ||
40 | static int fixed_voltage_is_enabled(struct regulator_dev *dev) | |
41 | { | |
86d9884b RQ |
42 | struct fixed_voltage_data *data = rdev_get_drvdata(dev); |
43 | ||
44 | return data->is_enabled; | |
4b74ff65 MB |
45 | } |
46 | ||
47 | static int fixed_voltage_enable(struct regulator_dev *dev) | |
48 | { | |
86d9884b RQ |
49 | struct fixed_voltage_data *data = rdev_get_drvdata(dev); |
50 | ||
51 | if (gpio_is_valid(data->gpio)) { | |
52 | gpio_set_value_cansleep(data->gpio, data->enable_high); | |
8ab3343d | 53 | data->is_enabled = true; |
86d9884b RQ |
54 | } |
55 | ||
56 | return 0; | |
57 | } | |
58 | ||
59 | static int fixed_voltage_disable(struct regulator_dev *dev) | |
60 | { | |
61 | struct fixed_voltage_data *data = rdev_get_drvdata(dev); | |
62 | ||
63 | if (gpio_is_valid(data->gpio)) { | |
64 | gpio_set_value_cansleep(data->gpio, !data->enable_high); | |
8ab3343d | 65 | data->is_enabled = false; |
86d9884b RQ |
66 | } |
67 | ||
4b74ff65 MB |
68 | return 0; |
69 | } | |
70 | ||
17133dc8 MB |
71 | static int fixed_voltage_enable_time(struct regulator_dev *dev) |
72 | { | |
73 | struct fixed_voltage_data *data = rdev_get_drvdata(dev); | |
74 | ||
75 | return data->startup_delay; | |
76 | } | |
77 | ||
4b74ff65 MB |
78 | static int fixed_voltage_get_voltage(struct regulator_dev *dev) |
79 | { | |
80 | struct fixed_voltage_data *data = rdev_get_drvdata(dev); | |
81 | ||
82 | return data->microvolts; | |
83 | } | |
84 | ||
9035cefc MB |
85 | static int fixed_voltage_list_voltage(struct regulator_dev *dev, |
86 | unsigned selector) | |
87 | { | |
88 | struct fixed_voltage_data *data = rdev_get_drvdata(dev); | |
89 | ||
90 | if (selector != 0) | |
91 | return -EINVAL; | |
92 | ||
93 | return data->microvolts; | |
94 | } | |
95 | ||
4b74ff65 MB |
96 | static struct regulator_ops fixed_voltage_ops = { |
97 | .is_enabled = fixed_voltage_is_enabled, | |
98 | .enable = fixed_voltage_enable, | |
86d9884b | 99 | .disable = fixed_voltage_disable, |
17133dc8 | 100 | .enable_time = fixed_voltage_enable_time, |
4b74ff65 | 101 | .get_voltage = fixed_voltage_get_voltage, |
9035cefc | 102 | .list_voltage = fixed_voltage_list_voltage, |
4b74ff65 MB |
103 | }; |
104 | ||
8ab3343d | 105 | static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev) |
4b74ff65 MB |
106 | { |
107 | struct fixed_voltage_config *config = pdev->dev.platform_data; | |
108 | struct fixed_voltage_data *drvdata; | |
109 | int ret; | |
110 | ||
111 | drvdata = kzalloc(sizeof(struct fixed_voltage_data), GFP_KERNEL); | |
112 | if (drvdata == NULL) { | |
c53ad7fe | 113 | dev_err(&pdev->dev, "Failed to allocate device data\n"); |
4b74ff65 MB |
114 | ret = -ENOMEM; |
115 | goto err; | |
116 | } | |
117 | ||
118 | drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL); | |
119 | if (drvdata->desc.name == NULL) { | |
c53ad7fe | 120 | dev_err(&pdev->dev, "Failed to allocate supply name\n"); |
4b74ff65 MB |
121 | ret = -ENOMEM; |
122 | goto err; | |
123 | } | |
124 | drvdata->desc.type = REGULATOR_VOLTAGE; | |
125 | drvdata->desc.owner = THIS_MODULE; | |
9035cefc MB |
126 | drvdata->desc.ops = &fixed_voltage_ops; |
127 | drvdata->desc.n_voltages = 1; | |
4b74ff65 MB |
128 | |
129 | drvdata->microvolts = config->microvolts; | |
86d9884b | 130 | drvdata->gpio = config->gpio; |
eda79a30 | 131 | drvdata->startup_delay = config->startup_delay; |
86d9884b RQ |
132 | |
133 | if (gpio_is_valid(config->gpio)) { | |
134 | drvdata->enable_high = config->enable_high; | |
135 | ||
136 | /* FIXME: Remove below print warning | |
137 | * | |
138 | * config->gpio must be set to -EINVAL by platform code if | |
139 | * GPIO control is not required. However, early adopters | |
140 | * not requiring GPIO control may forget to initialize | |
141 | * config->gpio to -EINVAL. This will cause GPIO 0 to be used | |
142 | * for GPIO control. | |
143 | * | |
144 | * This warning will be removed once there are a couple of users | |
145 | * for this driver. | |
146 | */ | |
147 | if (!config->gpio) | |
148 | dev_warn(&pdev->dev, | |
149 | "using GPIO 0 for regulator enable control\n"); | |
150 | ||
151 | ret = gpio_request(config->gpio, config->supply_name); | |
152 | if (ret) { | |
153 | dev_err(&pdev->dev, | |
154 | "Could not obtain regulator enable GPIO %d: %d\n", | |
155 | config->gpio, ret); | |
156 | goto err_name; | |
157 | } | |
158 | ||
159 | /* set output direction without changing state | |
160 | * to prevent glitch | |
161 | */ | |
162 | drvdata->is_enabled = config->enabled_at_boot; | |
163 | ret = drvdata->is_enabled ? | |
164 | config->enable_high : !config->enable_high; | |
165 | ||
166 | ret = gpio_direction_output(config->gpio, ret); | |
167 | if (ret) { | |
168 | dev_err(&pdev->dev, | |
169 | "Could not configure regulator enable GPIO %d direction: %d\n", | |
170 | config->gpio, ret); | |
171 | goto err_gpio; | |
172 | } | |
173 | ||
174 | } else { | |
175 | /* Regulator without GPIO control is considered | |
176 | * always enabled | |
177 | */ | |
8ab3343d | 178 | drvdata->is_enabled = true; |
86d9884b | 179 | } |
4b74ff65 | 180 | |
bcf3402c MB |
181 | drvdata->dev = regulator_register(&drvdata->desc, &pdev->dev, |
182 | config->init_data, drvdata); | |
4b74ff65 MB |
183 | if (IS_ERR(drvdata->dev)) { |
184 | ret = PTR_ERR(drvdata->dev); | |
c53ad7fe | 185 | dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret); |
86d9884b | 186 | goto err_gpio; |
4b74ff65 MB |
187 | } |
188 | ||
189 | platform_set_drvdata(pdev, drvdata); | |
190 | ||
191 | dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name, | |
192 | drvdata->microvolts); | |
193 | ||
194 | return 0; | |
195 | ||
86d9884b RQ |
196 | err_gpio: |
197 | if (gpio_is_valid(config->gpio)) | |
198 | gpio_free(config->gpio); | |
4b74ff65 MB |
199 | err_name: |
200 | kfree(drvdata->desc.name); | |
201 | err: | |
202 | kfree(drvdata); | |
203 | return ret; | |
204 | } | |
205 | ||
8ab3343d | 206 | static int __devexit reg_fixed_voltage_remove(struct platform_device *pdev) |
4b74ff65 MB |
207 | { |
208 | struct fixed_voltage_data *drvdata = platform_get_drvdata(pdev); | |
209 | ||
210 | regulator_unregister(drvdata->dev); | |
86d9884b RQ |
211 | if (gpio_is_valid(drvdata->gpio)) |
212 | gpio_free(drvdata->gpio); | |
80099c70 DC |
213 | kfree(drvdata->desc.name); |
214 | kfree(drvdata); | |
86d9884b | 215 | |
4b74ff65 MB |
216 | return 0; |
217 | } | |
218 | ||
219 | static struct platform_driver regulator_fixed_voltage_driver = { | |
8ab3343d DT |
220 | .probe = reg_fixed_voltage_probe, |
221 | .remove = __devexit_p(reg_fixed_voltage_remove), | |
4b74ff65 MB |
222 | .driver = { |
223 | .name = "reg-fixed-voltage", | |
8ab3343d | 224 | .owner = THIS_MODULE, |
4b74ff65 MB |
225 | }, |
226 | }; | |
227 | ||
228 | static int __init regulator_fixed_voltage_init(void) | |
229 | { | |
230 | return platform_driver_register(®ulator_fixed_voltage_driver); | |
231 | } | |
5a1b22be | 232 | subsys_initcall(regulator_fixed_voltage_init); |
4b74ff65 MB |
233 | |
234 | static void __exit regulator_fixed_voltage_exit(void) | |
235 | { | |
236 | platform_driver_unregister(®ulator_fixed_voltage_driver); | |
237 | } | |
238 | module_exit(regulator_fixed_voltage_exit); | |
239 | ||
240 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
241 | MODULE_DESCRIPTION("Fixed voltage regulator"); | |
242 | MODULE_LICENSE("GPL"); | |
38c53c89 | 243 | MODULE_ALIAS("platform:reg-fixed-voltage"); |