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4b74ff65 MB |
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> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
cef49102 RN |
29 | #include <linux/of.h> |
30 | #include <linux/of_gpio.h> | |
31 | #include <linux/regulator/of_regulator.h> | |
32 | #include <linux/regulator/machine.h> | |
4b74ff65 MB |
33 | |
34 | struct fixed_voltage_data { | |
35 | struct regulator_desc desc; | |
36 | struct regulator_dev *dev; | |
37 | int microvolts; | |
38 | }; | |
39 | ||
cef49102 RN |
40 | |
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 | */ | |
bc91396b AL |
49 | static struct fixed_voltage_config * |
50 | of_get_fixed_voltage_config(struct device *dev) | |
cef49102 RN |
51 | { |
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) | |
f141822b | 60 | return ERR_PTR(-ENOMEM); |
cef49102 | 61 | |
d9a861cc | 62 | config->init_data = of_get_regulator_init_data(dev, dev->of_node); |
4b864af1 | 63 | if (!config->init_data) |
f141822b | 64 | return ERR_PTR(-EINVAL); |
4b864af1 | 65 | |
cef49102 | 66 | init_data = config->init_data; |
0c437c4a | 67 | init_data->constraints.apply_uV = 0; |
cef49102 RN |
68 | |
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"); | |
f141822b | 75 | return ERR_PTR(-EINVAL); |
cef49102 RN |
76 | } |
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); | |
f141822b SW |
82 | /* |
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 | ||
cef49102 RN |
95 | 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 | ||
9a50dba5 LD |
102 | if (of_find_property(np, "gpio-open-drain", NULL)) |
103 | config->gpio_is_open_drain = true; | |
104 | ||
6be5bfc3 LD |
105 | if (of_find_property(np, "vin-supply", NULL)) |
106 | config->input_supply = "vin"; | |
107 | ||
cef49102 RN |
108 | return config; |
109 | } | |
110 | ||
4b74ff65 MB |
111 | static int fixed_voltage_get_voltage(struct regulator_dev *dev) |
112 | { | |
113 | struct fixed_voltage_data *data = rdev_get_drvdata(dev); | |
114 | ||
aebe4958 MB |
115 | if (data->microvolts) |
116 | return data->microvolts; | |
117 | else | |
118 | return -EINVAL; | |
4b74ff65 MB |
119 | } |
120 | ||
9035cefc MB |
121 | static 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 | ||
9d442061 MB |
132 | static struct regulator_ops fixed_voltage_ops = { |
133 | .get_voltage = fixed_voltage_get_voltage, | |
134 | .list_voltage = fixed_voltage_list_voltage, | |
135 | }; | |
136 | ||
8ab3343d | 137 | static int __devinit reg_fixed_voltage_probe(struct platform_device *pdev) |
4b74ff65 | 138 | { |
22d881c0 | 139 | struct fixed_voltage_config *config; |
4b74ff65 | 140 | struct fixed_voltage_data *drvdata; |
c172708d | 141 | struct regulator_config cfg = { }; |
4b74ff65 MB |
142 | int ret; |
143 | ||
f141822b | 144 | if (pdev->dev.of_node) { |
cef49102 | 145 | config = of_get_fixed_voltage_config(&pdev->dev); |
f141822b SW |
146 | if (IS_ERR(config)) |
147 | return PTR_ERR(config); | |
148 | } else { | |
22d881c0 | 149 | config = pdev->dev.platform_data; |
f141822b | 150 | } |
22d881c0 AL |
151 | |
152 | if (!config) | |
153 | return -ENOMEM; | |
cef49102 | 154 | |
c45bb35f MB |
155 | drvdata = devm_kzalloc(&pdev->dev, sizeof(struct fixed_voltage_data), |
156 | GFP_KERNEL); | |
4b74ff65 | 157 | if (drvdata == NULL) { |
c53ad7fe | 158 | dev_err(&pdev->dev, "Failed to allocate device data\n"); |
4b74ff65 MB |
159 | ret = -ENOMEM; |
160 | goto err; | |
161 | } | |
162 | ||
163 | drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL); | |
164 | if (drvdata->desc.name == NULL) { | |
c53ad7fe | 165 | dev_err(&pdev->dev, "Failed to allocate supply name\n"); |
4b74ff65 MB |
166 | ret = -ENOMEM; |
167 | goto err; | |
168 | } | |
169 | drvdata->desc.type = REGULATOR_VOLTAGE; | |
170 | drvdata->desc.owner = THIS_MODULE; | |
25a53dfb | 171 | drvdata->desc.ops = &fixed_voltage_ops; |
1c37f8a8 | 172 | |
3d0f267f MB |
173 | drvdata->desc.enable_time = config->startup_delay; |
174 | ||
6be5bfc3 LD |
175 | 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 | ||
1c37f8a8 SH |
186 | if (config->microvolts) |
187 | drvdata->desc.n_voltages = 1; | |
4b74ff65 MB |
188 | |
189 | drvdata->microvolts = config->microvolts; | |
9d442061 | 190 | |
25a53dfb MB |
191 | 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; | |
199 | } | |
86d9884b | 200 | } else { |
25a53dfb MB |
201 | 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 | } | |
86d9884b | 206 | } |
25a53dfb MB |
207 | if (config->gpio_is_open_drain) |
208 | cfg.ena_gpio_flags |= GPIOF_OPEN_DRAIN; | |
4b74ff65 | 209 | |
c172708d MB |
210 | 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); | |
4b74ff65 MB |
216 | if (IS_ERR(drvdata->dev)) { |
217 | ret = PTR_ERR(drvdata->dev); | |
c53ad7fe | 218 | dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret); |
6be5bfc3 | 219 | goto err_input; |
4b74ff65 MB |
220 | } |
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 | ||
6be5bfc3 LD |
229 | err_input: |
230 | kfree(drvdata->desc.supply_name); | |
4b74ff65 MB |
231 | err_name: |
232 | kfree(drvdata->desc.name); | |
233 | err: | |
4b74ff65 MB |
234 | return ret; |
235 | } | |
236 | ||
8ab3343d | 237 | static int __devexit reg_fixed_voltage_remove(struct platform_device *pdev) |
4b74ff65 MB |
238 | { |
239 | struct fixed_voltage_data *drvdata = platform_get_drvdata(pdev); | |
240 | ||
241 | regulator_unregister(drvdata->dev); | |
6be5bfc3 | 242 | kfree(drvdata->desc.supply_name); |
80099c70 | 243 | kfree(drvdata->desc.name); |
86d9884b | 244 | |
4b74ff65 MB |
245 | return 0; |
246 | } | |
247 | ||
cef49102 RN |
248 | #if defined(CONFIG_OF) |
249 | static const struct of_device_id fixed_of_match[] __devinitconst = { | |
250 | { .compatible = "regulator-fixed", }, | |
251 | {}, | |
252 | }; | |
253 | MODULE_DEVICE_TABLE(of, fixed_of_match); | |
cef49102 RN |
254 | #endif |
255 | ||
4b74ff65 | 256 | static struct platform_driver regulator_fixed_voltage_driver = { |
8ab3343d DT |
257 | .probe = reg_fixed_voltage_probe, |
258 | .remove = __devexit_p(reg_fixed_voltage_remove), | |
4b74ff65 MB |
259 | .driver = { |
260 | .name = "reg-fixed-voltage", | |
8ab3343d | 261 | .owner = THIS_MODULE, |
abcfaf23 | 262 | .of_match_table = of_match_ptr(fixed_of_match), |
4b74ff65 MB |
263 | }, |
264 | }; | |
265 | ||
266 | static int __init regulator_fixed_voltage_init(void) | |
267 | { | |
268 | return platform_driver_register(®ulator_fixed_voltage_driver); | |
269 | } | |
5a1b22be | 270 | subsys_initcall(regulator_fixed_voltage_init); |
4b74ff65 MB |
271 | |
272 | static void __exit regulator_fixed_voltage_exit(void) | |
273 | { | |
274 | platform_driver_unregister(®ulator_fixed_voltage_driver); | |
275 | } | |
276 | module_exit(regulator_fixed_voltage_exit); | |
277 | ||
278 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
279 | MODULE_DESCRIPTION("Fixed voltage regulator"); | |
280 | MODULE_LICENSE("GPL"); | |
38c53c89 | 281 | MODULE_ALIAS("platform:reg-fixed-voltage"); |