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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> | |
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> |
4b74ff65 MB |
30 | |
31 | struct fixed_voltage_data { | |
32 | struct regulator_desc desc; | |
33 | struct regulator_dev *dev; | |
34 | int microvolts; | |
86d9884b | 35 | int gpio; |
eda79a30 | 36 | unsigned startup_delay; |
8ab3343d DT |
37 | bool enable_high; |
38 | bool is_enabled; | |
4b74ff65 MB |
39 | }; |
40 | ||
41 | static int fixed_voltage_is_enabled(struct regulator_dev *dev) | |
42 | { | |
86d9884b RQ |
43 | struct fixed_voltage_data *data = rdev_get_drvdata(dev); |
44 | ||
45 | return data->is_enabled; | |
4b74ff65 MB |
46 | } |
47 | ||
48 | static int fixed_voltage_enable(struct regulator_dev *dev) | |
49 | { | |
86d9884b RQ |
50 | struct fixed_voltage_data *data = rdev_get_drvdata(dev); |
51 | ||
52 | if (gpio_is_valid(data->gpio)) { | |
53 | gpio_set_value_cansleep(data->gpio, data->enable_high); | |
8ab3343d | 54 | data->is_enabled = true; |
86d9884b RQ |
55 | } |
56 | ||
57 | return 0; | |
58 | } | |
59 | ||
60 | static int fixed_voltage_disable(struct regulator_dev *dev) | |
61 | { | |
62 | struct fixed_voltage_data *data = rdev_get_drvdata(dev); | |
63 | ||
64 | if (gpio_is_valid(data->gpio)) { | |
65 | gpio_set_value_cansleep(data->gpio, !data->enable_high); | |
8ab3343d | 66 | data->is_enabled = false; |
86d9884b RQ |
67 | } |
68 | ||
4b74ff65 MB |
69 | return 0; |
70 | } | |
71 | ||
17133dc8 MB |
72 | static int fixed_voltage_enable_time(struct regulator_dev *dev) |
73 | { | |
74 | struct fixed_voltage_data *data = rdev_get_drvdata(dev); | |
75 | ||
76 | return data->startup_delay; | |
77 | } | |
78 | ||
4b74ff65 MB |
79 | static int fixed_voltage_get_voltage(struct regulator_dev *dev) |
80 | { | |
81 | struct fixed_voltage_data *data = rdev_get_drvdata(dev); | |
82 | ||
83 | return data->microvolts; | |
84 | } | |
85 | ||
9035cefc MB |
86 | static int fixed_voltage_list_voltage(struct regulator_dev *dev, |
87 | unsigned selector) | |
88 | { | |
89 | struct fixed_voltage_data *data = rdev_get_drvdata(dev); | |
90 | ||
91 | if (selector != 0) | |
92 | return -EINVAL; | |
93 | ||
94 | return data->microvolts; | |
95 | } | |
96 | ||
4b74ff65 MB |
97 | static struct regulator_ops fixed_voltage_ops = { |
98 | .is_enabled = fixed_voltage_is_enabled, | |
99 | .enable = fixed_voltage_enable, | |
86d9884b | 100 | .disable = fixed_voltage_disable, |
17133dc8 | 101 | .enable_time = fixed_voltage_enable_time, |
4b74ff65 | 102 | .get_voltage = fixed_voltage_get_voltage, |
9035cefc | 103 | .list_voltage = fixed_voltage_list_voltage, |
4b74ff65 MB |
104 | }; |
105 | ||
8ab3343d | 106 | static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev) |
4b74ff65 MB |
107 | { |
108 | struct fixed_voltage_config *config = pdev->dev.platform_data; | |
109 | struct fixed_voltage_data *drvdata; | |
110 | int ret; | |
111 | ||
112 | drvdata = kzalloc(sizeof(struct fixed_voltage_data), GFP_KERNEL); | |
113 | if (drvdata == NULL) { | |
c53ad7fe | 114 | dev_err(&pdev->dev, "Failed to allocate device data\n"); |
4b74ff65 MB |
115 | ret = -ENOMEM; |
116 | goto err; | |
117 | } | |
118 | ||
119 | drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL); | |
120 | if (drvdata->desc.name == NULL) { | |
c53ad7fe | 121 | dev_err(&pdev->dev, "Failed to allocate supply name\n"); |
4b74ff65 MB |
122 | ret = -ENOMEM; |
123 | goto err; | |
124 | } | |
125 | drvdata->desc.type = REGULATOR_VOLTAGE; | |
126 | drvdata->desc.owner = THIS_MODULE; | |
9035cefc MB |
127 | drvdata->desc.ops = &fixed_voltage_ops; |
128 | drvdata->desc.n_voltages = 1; | |
4b74ff65 MB |
129 | |
130 | drvdata->microvolts = config->microvolts; | |
86d9884b | 131 | drvdata->gpio = config->gpio; |
eda79a30 | 132 | drvdata->startup_delay = config->startup_delay; |
86d9884b RQ |
133 | |
134 | if (gpio_is_valid(config->gpio)) { | |
135 | drvdata->enable_high = config->enable_high; | |
136 | ||
137 | /* FIXME: Remove below print warning | |
138 | * | |
139 | * config->gpio must be set to -EINVAL by platform code if | |
140 | * GPIO control is not required. However, early adopters | |
141 | * not requiring GPIO control may forget to initialize | |
142 | * config->gpio to -EINVAL. This will cause GPIO 0 to be used | |
143 | * for GPIO control. | |
144 | * | |
145 | * This warning will be removed once there are a couple of users | |
146 | * for this driver. | |
147 | */ | |
148 | if (!config->gpio) | |
149 | dev_warn(&pdev->dev, | |
150 | "using GPIO 0 for regulator enable control\n"); | |
151 | ||
152 | ret = gpio_request(config->gpio, config->supply_name); | |
153 | if (ret) { | |
154 | dev_err(&pdev->dev, | |
155 | "Could not obtain regulator enable GPIO %d: %d\n", | |
156 | config->gpio, ret); | |
157 | goto err_name; | |
158 | } | |
159 | ||
160 | /* set output direction without changing state | |
161 | * to prevent glitch | |
162 | */ | |
163 | drvdata->is_enabled = config->enabled_at_boot; | |
164 | ret = drvdata->is_enabled ? | |
165 | config->enable_high : !config->enable_high; | |
166 | ||
167 | ret = gpio_direction_output(config->gpio, ret); | |
168 | if (ret) { | |
169 | dev_err(&pdev->dev, | |
170 | "Could not configure regulator enable GPIO %d direction: %d\n", | |
171 | config->gpio, ret); | |
172 | goto err_gpio; | |
173 | } | |
174 | ||
175 | } else { | |
176 | /* Regulator without GPIO control is considered | |
177 | * always enabled | |
178 | */ | |
8ab3343d | 179 | drvdata->is_enabled = true; |
86d9884b | 180 | } |
4b74ff65 | 181 | |
bcf3402c MB |
182 | drvdata->dev = regulator_register(&drvdata->desc, &pdev->dev, |
183 | config->init_data, drvdata); | |
4b74ff65 MB |
184 | if (IS_ERR(drvdata->dev)) { |
185 | ret = PTR_ERR(drvdata->dev); | |
c53ad7fe | 186 | dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret); |
86d9884b | 187 | goto err_gpio; |
4b74ff65 MB |
188 | } |
189 | ||
190 | platform_set_drvdata(pdev, drvdata); | |
191 | ||
192 | dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name, | |
193 | drvdata->microvolts); | |
194 | ||
195 | return 0; | |
196 | ||
86d9884b RQ |
197 | err_gpio: |
198 | if (gpio_is_valid(config->gpio)) | |
199 | gpio_free(config->gpio); | |
4b74ff65 MB |
200 | err_name: |
201 | kfree(drvdata->desc.name); | |
202 | err: | |
203 | kfree(drvdata); | |
204 | return ret; | |
205 | } | |
206 | ||
8ab3343d | 207 | static int __devexit reg_fixed_voltage_remove(struct platform_device *pdev) |
4b74ff65 MB |
208 | { |
209 | struct fixed_voltage_data *drvdata = platform_get_drvdata(pdev); | |
210 | ||
211 | regulator_unregister(drvdata->dev); | |
86d9884b RQ |
212 | if (gpio_is_valid(drvdata->gpio)) |
213 | gpio_free(drvdata->gpio); | |
80099c70 DC |
214 | kfree(drvdata->desc.name); |
215 | kfree(drvdata); | |
86d9884b | 216 | |
4b74ff65 MB |
217 | return 0; |
218 | } | |
219 | ||
220 | static struct platform_driver regulator_fixed_voltage_driver = { | |
8ab3343d DT |
221 | .probe = reg_fixed_voltage_probe, |
222 | .remove = __devexit_p(reg_fixed_voltage_remove), | |
4b74ff65 MB |
223 | .driver = { |
224 | .name = "reg-fixed-voltage", | |
8ab3343d | 225 | .owner = THIS_MODULE, |
4b74ff65 MB |
226 | }, |
227 | }; | |
228 | ||
229 | static int __init regulator_fixed_voltage_init(void) | |
230 | { | |
231 | return platform_driver_register(®ulator_fixed_voltage_driver); | |
232 | } | |
5a1b22be | 233 | subsys_initcall(regulator_fixed_voltage_init); |
4b74ff65 MB |
234 | |
235 | static void __exit regulator_fixed_voltage_exit(void) | |
236 | { | |
237 | platform_driver_unregister(®ulator_fixed_voltage_driver); | |
238 | } | |
239 | module_exit(regulator_fixed_voltage_exit); | |
240 | ||
241 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
242 | MODULE_DESCRIPTION("Fixed voltage regulator"); | |
243 | MODULE_LICENSE("GPL"); | |
38c53c89 | 244 | MODULE_ALIAS("platform:reg-fixed-voltage"); |