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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; | |
4b74ff65 MB |
37 | }; |
38 | ||
cef49102 RN |
39 | |
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 | */ | |
bc91396b AL |
48 | static struct fixed_voltage_config * |
49 | of_get_fixed_voltage_config(struct device *dev) | |
cef49102 RN |
50 | { |
51 | struct fixed_voltage_config *config; | |
52 | struct device_node *np = dev->of_node; | |
cef49102 RN |
53 | struct regulator_init_data *init_data; |
54 | ||
55 | config = devm_kzalloc(dev, sizeof(struct fixed_voltage_config), | |
56 | GFP_KERNEL); | |
57 | if (!config) | |
f141822b | 58 | return ERR_PTR(-ENOMEM); |
cef49102 | 59 | |
d9a861cc | 60 | config->init_data = of_get_regulator_init_data(dev, dev->of_node); |
4b864af1 | 61 | if (!config->init_data) |
f141822b | 62 | return ERR_PTR(-EINVAL); |
4b864af1 | 63 | |
cef49102 | 64 | init_data = config->init_data; |
0c437c4a | 65 | init_data->constraints.apply_uV = 0; |
cef49102 RN |
66 | |
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"); | |
f141822b | 73 | return ERR_PTR(-EINVAL); |
cef49102 RN |
74 | } |
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); | |
f141822b SW |
80 | /* |
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 | ||
4127f696 | 93 | of_property_read_u32(np, "startup-delay-us", &config->startup_delay); |
cef49102 | 94 | |
4127f696 SS |
95 | 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"); | |
9a50dba5 | 98 | |
6be5bfc3 LD |
99 | if (of_find_property(np, "vin-supply", NULL)) |
100 | config->input_supply = "vin"; | |
101 | ||
cef49102 RN |
102 | return config; |
103 | } | |
104 | ||
9d442061 | 105 | static struct regulator_ops fixed_voltage_ops = { |
9d442061 MB |
106 | }; |
107 | ||
a5023574 | 108 | static int reg_fixed_voltage_probe(struct platform_device *pdev) |
4b74ff65 | 109 | { |
22d881c0 | 110 | struct fixed_voltage_config *config; |
4b74ff65 | 111 | struct fixed_voltage_data *drvdata; |
c172708d | 112 | struct regulator_config cfg = { }; |
4b74ff65 MB |
113 | int ret; |
114 | ||
f141822b | 115 | if (pdev->dev.of_node) { |
cef49102 | 116 | config = of_get_fixed_voltage_config(&pdev->dev); |
f141822b SW |
117 | if (IS_ERR(config)) |
118 | return PTR_ERR(config); | |
119 | } else { | |
dff91d0b | 120 | config = dev_get_platdata(&pdev->dev); |
f141822b | 121 | } |
22d881c0 AL |
122 | |
123 | if (!config) | |
124 | return -ENOMEM; | |
cef49102 | 125 | |
c45bb35f MB |
126 | drvdata = devm_kzalloc(&pdev->dev, sizeof(struct fixed_voltage_data), |
127 | GFP_KERNEL); | |
f1b3f903 | 128 | if (!drvdata) |
84d0ffbe | 129 | return -ENOMEM; |
4b74ff65 | 130 | |
84d0ffbe MB |
131 | drvdata->desc.name = devm_kstrdup(&pdev->dev, |
132 | config->supply_name, | |
133 | GFP_KERNEL); | |
4b74ff65 | 134 | if (drvdata->desc.name == NULL) { |
c53ad7fe | 135 | dev_err(&pdev->dev, "Failed to allocate supply name\n"); |
84d0ffbe | 136 | return -ENOMEM; |
4b74ff65 MB |
137 | } |
138 | drvdata->desc.type = REGULATOR_VOLTAGE; | |
139 | drvdata->desc.owner = THIS_MODULE; | |
25a53dfb | 140 | drvdata->desc.ops = &fixed_voltage_ops; |
1c37f8a8 | 141 | |
3d0f267f MB |
142 | drvdata->desc.enable_time = config->startup_delay; |
143 | ||
6be5bfc3 | 144 | if (config->input_supply) { |
84d0ffbe MB |
145 | drvdata->desc.supply_name = devm_kstrdup(&pdev->dev, |
146 | config->input_supply, | |
147 | GFP_KERNEL); | |
6be5bfc3 LD |
148 | if (!drvdata->desc.supply_name) { |
149 | dev_err(&pdev->dev, | |
150 | "Failed to allocate input supply\n"); | |
84d0ffbe | 151 | return -ENOMEM; |
6be5bfc3 LD |
152 | } |
153 | } | |
154 | ||
1c37f8a8 SH |
155 | if (config->microvolts) |
156 | drvdata->desc.n_voltages = 1; | |
4b74ff65 | 157 | |
c368e5fc | 158 | drvdata->desc.fixed_uV = config->microvolts; |
9d442061 | 159 | |
25a53dfb MB |
160 | if (config->gpio >= 0) |
161 | cfg.ena_gpio = config->gpio; | |
162 | cfg.ena_gpio_invert = !config->enable_high; | |
163 | if (config->enabled_at_boot) { | |
609d5f6d | 164 | if (config->enable_high) |
25a53dfb | 165 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH; |
609d5f6d | 166 | else |
25a53dfb | 167 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW; |
86d9884b | 168 | } else { |
609d5f6d | 169 | if (config->enable_high) |
25a53dfb | 170 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW; |
609d5f6d | 171 | else |
25a53dfb | 172 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH; |
86d9884b | 173 | } |
25a53dfb MB |
174 | if (config->gpio_is_open_drain) |
175 | cfg.ena_gpio_flags |= GPIOF_OPEN_DRAIN; | |
4b74ff65 | 176 | |
c172708d MB |
177 | 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 | ||
84d0ffbe MB |
182 | drvdata->dev = devm_regulator_register(&pdev->dev, &drvdata->desc, |
183 | &cfg); | |
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); |
84d0ffbe | 187 | return ret; |
4b74ff65 MB |
188 | } |
189 | ||
190 | platform_set_drvdata(pdev, drvdata); | |
191 | ||
192 | dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name, | |
c368e5fc | 193 | drvdata->desc.fixed_uV); |
4b74ff65 MB |
194 | |
195 | return 0; | |
4b74ff65 MB |
196 | } |
197 | ||
cef49102 | 198 | #if defined(CONFIG_OF) |
3d68dfe3 | 199 | static const struct of_device_id fixed_of_match[] = { |
cef49102 RN |
200 | { .compatible = "regulator-fixed", }, |
201 | {}, | |
202 | }; | |
203 | MODULE_DEVICE_TABLE(of, fixed_of_match); | |
cef49102 RN |
204 | #endif |
205 | ||
4b74ff65 | 206 | static struct platform_driver regulator_fixed_voltage_driver = { |
8ab3343d | 207 | .probe = reg_fixed_voltage_probe, |
4b74ff65 MB |
208 | .driver = { |
209 | .name = "reg-fixed-voltage", | |
8ab3343d | 210 | .owner = THIS_MODULE, |
abcfaf23 | 211 | .of_match_table = of_match_ptr(fixed_of_match), |
4b74ff65 MB |
212 | }, |
213 | }; | |
214 | ||
215 | static int __init regulator_fixed_voltage_init(void) | |
216 | { | |
217 | return platform_driver_register(®ulator_fixed_voltage_driver); | |
218 | } | |
5a1b22be | 219 | subsys_initcall(regulator_fixed_voltage_init); |
4b74ff65 MB |
220 | |
221 | static void __exit regulator_fixed_voltage_exit(void) | |
222 | { | |
223 | platform_driver_unregister(®ulator_fixed_voltage_driver); | |
224 | } | |
225 | module_exit(regulator_fixed_voltage_exit); | |
226 | ||
227 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
228 | MODULE_DESCRIPTION("Fixed voltage regulator"); | |
229 | MODULE_LICENSE("GPL"); | |
38c53c89 | 230 | MODULE_ALIAS("platform:reg-fixed-voltage"); |