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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> | |
13bed58c LB |
33 | #include <linux/acpi.h> |
34 | #include <linux/property.h> | |
35 | #include <linux/gpio/consumer.h> | |
4b74ff65 MB |
36 | |
37 | struct fixed_voltage_data { | |
38 | struct regulator_desc desc; | |
39 | struct regulator_dev *dev; | |
4b74ff65 MB |
40 | }; |
41 | ||
cef49102 RN |
42 | |
43 | /** | |
44 | * of_get_fixed_voltage_config - extract fixed_voltage_config structure info | |
45 | * @dev: device requesting for fixed_voltage_config | |
072e78b1 | 46 | * @desc: regulator description |
cef49102 RN |
47 | * |
48 | * Populates fixed_voltage_config structure by extracting data from device | |
49 | * tree node, returns a pointer to the populated structure of NULL if memory | |
50 | * alloc fails. | |
51 | */ | |
bc91396b | 52 | static struct fixed_voltage_config * |
072e78b1 JMC |
53 | of_get_fixed_voltage_config(struct device *dev, |
54 | const struct regulator_desc *desc) | |
cef49102 RN |
55 | { |
56 | struct fixed_voltage_config *config; | |
57 | struct device_node *np = dev->of_node; | |
cef49102 RN |
58 | struct regulator_init_data *init_data; |
59 | ||
60 | config = devm_kzalloc(dev, sizeof(struct fixed_voltage_config), | |
61 | GFP_KERNEL); | |
62 | if (!config) | |
f141822b | 63 | return ERR_PTR(-ENOMEM); |
cef49102 | 64 | |
072e78b1 | 65 | config->init_data = of_get_regulator_init_data(dev, dev->of_node, desc); |
4b864af1 | 66 | if (!config->init_data) |
f141822b | 67 | return ERR_PTR(-EINVAL); |
4b864af1 | 68 | |
cef49102 | 69 | init_data = config->init_data; |
0c437c4a | 70 | init_data->constraints.apply_uV = 0; |
cef49102 RN |
71 | |
72 | config->supply_name = init_data->constraints.name; | |
73 | if (init_data->constraints.min_uV == init_data->constraints.max_uV) { | |
74 | config->microvolts = init_data->constraints.min_uV; | |
75 | } else { | |
76 | dev_err(dev, | |
77 | "Fixed regulator specified with variable voltages\n"); | |
f141822b | 78 | return ERR_PTR(-EINVAL); |
cef49102 RN |
79 | } |
80 | ||
81 | if (init_data->constraints.boot_on) | |
82 | config->enabled_at_boot = true; | |
83 | ||
84 | config->gpio = of_get_named_gpio(np, "gpio", 0); | |
f5a6d351 LD |
85 | if ((config->gpio < 0) && (config->gpio != -ENOENT)) |
86 | return ERR_PTR(config->gpio); | |
f141822b | 87 | |
4127f696 | 88 | of_property_read_u32(np, "startup-delay-us", &config->startup_delay); |
cef49102 | 89 | |
4127f696 SS |
90 | config->enable_high = of_property_read_bool(np, "enable-active-high"); |
91 | config->gpio_is_open_drain = of_property_read_bool(np, | |
92 | "gpio-open-drain"); | |
9a50dba5 | 93 | |
6be5bfc3 LD |
94 | if (of_find_property(np, "vin-supply", NULL)) |
95 | config->input_supply = "vin"; | |
96 | ||
cef49102 RN |
97 | return config; |
98 | } | |
99 | ||
13bed58c LB |
100 | /** |
101 | * acpi_get_fixed_voltage_config - extract fixed_voltage_config structure info | |
102 | * @dev: device requesting for fixed_voltage_config | |
103 | * @desc: regulator description | |
104 | * | |
105 | * Populates fixed_voltage_config structure by extracting data through ACPI | |
106 | * interface, returns a pointer to the populated structure of NULL if memory | |
107 | * alloc fails. | |
108 | */ | |
109 | static struct fixed_voltage_config * | |
110 | acpi_get_fixed_voltage_config(struct device *dev, | |
111 | const struct regulator_desc *desc) | |
112 | { | |
113 | struct fixed_voltage_config *config; | |
114 | const char *supply_name; | |
115 | struct gpio_desc *gpiod; | |
116 | int ret; | |
117 | ||
118 | config = devm_kzalloc(dev, sizeof(*config), GFP_KERNEL); | |
119 | if (!config) | |
120 | return ERR_PTR(-ENOMEM); | |
121 | ||
122 | ret = device_property_read_string(dev, "supply-name", &supply_name); | |
123 | if (!ret) | |
124 | config->supply_name = supply_name; | |
125 | ||
126 | gpiod = gpiod_get(dev, "gpio", GPIOD_ASIS); | |
127 | if (IS_ERR(gpiod)) | |
128 | return ERR_PTR(-ENODEV); | |
129 | ||
130 | config->gpio = desc_to_gpio(gpiod); | |
131 | config->enable_high = device_property_read_bool(dev, | |
132 | "enable-active-high"); | |
133 | gpiod_put(gpiod); | |
134 | ||
135 | return config; | |
136 | } | |
137 | ||
9d442061 | 138 | static struct regulator_ops fixed_voltage_ops = { |
9d442061 MB |
139 | }; |
140 | ||
a5023574 | 141 | static int reg_fixed_voltage_probe(struct platform_device *pdev) |
4b74ff65 | 142 | { |
22d881c0 | 143 | struct fixed_voltage_config *config; |
4b74ff65 | 144 | struct fixed_voltage_data *drvdata; |
c172708d | 145 | struct regulator_config cfg = { }; |
4b74ff65 MB |
146 | int ret; |
147 | ||
072e78b1 JMC |
148 | drvdata = devm_kzalloc(&pdev->dev, sizeof(struct fixed_voltage_data), |
149 | GFP_KERNEL); | |
150 | if (!drvdata) | |
151 | return -ENOMEM; | |
152 | ||
f141822b | 153 | if (pdev->dev.of_node) { |
072e78b1 JMC |
154 | config = of_get_fixed_voltage_config(&pdev->dev, |
155 | &drvdata->desc); | |
f141822b SW |
156 | if (IS_ERR(config)) |
157 | return PTR_ERR(config); | |
13bed58c LB |
158 | } else if (ACPI_HANDLE(&pdev->dev)) { |
159 | config = acpi_get_fixed_voltage_config(&pdev->dev, | |
160 | &drvdata->desc); | |
161 | if (IS_ERR(config)) | |
162 | return PTR_ERR(config); | |
f141822b | 163 | } else { |
dff91d0b | 164 | config = dev_get_platdata(&pdev->dev); |
f141822b | 165 | } |
22d881c0 AL |
166 | |
167 | if (!config) | |
168 | return -ENOMEM; | |
cef49102 | 169 | |
84d0ffbe MB |
170 | drvdata->desc.name = devm_kstrdup(&pdev->dev, |
171 | config->supply_name, | |
172 | GFP_KERNEL); | |
4b74ff65 | 173 | if (drvdata->desc.name == NULL) { |
c53ad7fe | 174 | dev_err(&pdev->dev, "Failed to allocate supply name\n"); |
84d0ffbe | 175 | return -ENOMEM; |
4b74ff65 MB |
176 | } |
177 | drvdata->desc.type = REGULATOR_VOLTAGE; | |
178 | drvdata->desc.owner = THIS_MODULE; | |
25a53dfb | 179 | drvdata->desc.ops = &fixed_voltage_ops; |
1c37f8a8 | 180 | |
3d0f267f MB |
181 | drvdata->desc.enable_time = config->startup_delay; |
182 | ||
6be5bfc3 | 183 | if (config->input_supply) { |
84d0ffbe MB |
184 | drvdata->desc.supply_name = devm_kstrdup(&pdev->dev, |
185 | config->input_supply, | |
186 | GFP_KERNEL); | |
6be5bfc3 LD |
187 | if (!drvdata->desc.supply_name) { |
188 | dev_err(&pdev->dev, | |
189 | "Failed to allocate input supply\n"); | |
84d0ffbe | 190 | return -ENOMEM; |
6be5bfc3 LD |
191 | } |
192 | } | |
193 | ||
1c37f8a8 SH |
194 | if (config->microvolts) |
195 | drvdata->desc.n_voltages = 1; | |
4b74ff65 | 196 | |
c368e5fc | 197 | drvdata->desc.fixed_uV = config->microvolts; |
9d442061 | 198 | |
5315fe2f | 199 | if (gpio_is_valid(config->gpio)) { |
25a53dfb | 200 | cfg.ena_gpio = config->gpio; |
1de3821a MP |
201 | if (pdev->dev.of_node) |
202 | cfg.ena_gpio_initialized = true; | |
203 | } | |
25a53dfb MB |
204 | cfg.ena_gpio_invert = !config->enable_high; |
205 | if (config->enabled_at_boot) { | |
609d5f6d | 206 | if (config->enable_high) |
25a53dfb | 207 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH; |
609d5f6d | 208 | else |
25a53dfb | 209 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW; |
86d9884b | 210 | } else { |
609d5f6d | 211 | if (config->enable_high) |
25a53dfb | 212 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW; |
609d5f6d | 213 | else |
25a53dfb | 214 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH; |
86d9884b | 215 | } |
25a53dfb MB |
216 | if (config->gpio_is_open_drain) |
217 | cfg.ena_gpio_flags |= GPIOF_OPEN_DRAIN; | |
4b74ff65 | 218 | |
c172708d MB |
219 | cfg.dev = &pdev->dev; |
220 | cfg.init_data = config->init_data; | |
221 | cfg.driver_data = drvdata; | |
222 | cfg.of_node = pdev->dev.of_node; | |
223 | ||
84d0ffbe MB |
224 | drvdata->dev = devm_regulator_register(&pdev->dev, &drvdata->desc, |
225 | &cfg); | |
4b74ff65 MB |
226 | if (IS_ERR(drvdata->dev)) { |
227 | ret = PTR_ERR(drvdata->dev); | |
c53ad7fe | 228 | dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret); |
84d0ffbe | 229 | return ret; |
4b74ff65 MB |
230 | } |
231 | ||
232 | platform_set_drvdata(pdev, drvdata); | |
233 | ||
234 | dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name, | |
c368e5fc | 235 | drvdata->desc.fixed_uV); |
4b74ff65 MB |
236 | |
237 | return 0; | |
4b74ff65 MB |
238 | } |
239 | ||
cef49102 | 240 | #if defined(CONFIG_OF) |
3d68dfe3 | 241 | static const struct of_device_id fixed_of_match[] = { |
cef49102 RN |
242 | { .compatible = "regulator-fixed", }, |
243 | {}, | |
244 | }; | |
245 | MODULE_DEVICE_TABLE(of, fixed_of_match); | |
cef49102 RN |
246 | #endif |
247 | ||
4b74ff65 | 248 | static struct platform_driver regulator_fixed_voltage_driver = { |
8ab3343d | 249 | .probe = reg_fixed_voltage_probe, |
4b74ff65 MB |
250 | .driver = { |
251 | .name = "reg-fixed-voltage", | |
abcfaf23 | 252 | .of_match_table = of_match_ptr(fixed_of_match), |
4b74ff65 MB |
253 | }, |
254 | }; | |
255 | ||
256 | static int __init regulator_fixed_voltage_init(void) | |
257 | { | |
258 | return platform_driver_register(®ulator_fixed_voltage_driver); | |
259 | } | |
5a1b22be | 260 | subsys_initcall(regulator_fixed_voltage_init); |
4b74ff65 MB |
261 | |
262 | static void __exit regulator_fixed_voltage_exit(void) | |
263 | { | |
264 | platform_driver_unregister(®ulator_fixed_voltage_driver); | |
265 | } | |
266 | module_exit(regulator_fixed_voltage_exit); | |
267 | ||
268 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
269 | MODULE_DESCRIPTION("Fixed voltage regulator"); | |
270 | MODULE_LICENSE("GPL"); | |
38c53c89 | 271 | MODULE_ALIAS("platform:reg-fixed-voltage"); |