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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 | |
072e78b1 | 43 | * @desc: regulator description |
cef49102 RN |
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 | 49 | static struct fixed_voltage_config * |
072e78b1 JMC |
50 | of_get_fixed_voltage_config(struct device *dev, |
51 | const struct regulator_desc *desc) | |
cef49102 RN |
52 | { |
53 | struct fixed_voltage_config *config; | |
54 | struct device_node *np = dev->of_node; | |
cef49102 RN |
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 | |
072e78b1 | 62 | config->init_data = of_get_regulator_init_data(dev, dev->of_node, desc); |
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 | ||
4127f696 | 95 | of_property_read_u32(np, "startup-delay-us", &config->startup_delay); |
cef49102 | 96 | |
4127f696 SS |
97 | config->enable_high = of_property_read_bool(np, "enable-active-high"); |
98 | config->gpio_is_open_drain = of_property_read_bool(np, | |
99 | "gpio-open-drain"); | |
9a50dba5 | 100 | |
6be5bfc3 LD |
101 | if (of_find_property(np, "vin-supply", NULL)) |
102 | config->input_supply = "vin"; | |
103 | ||
cef49102 RN |
104 | return config; |
105 | } | |
106 | ||
9d442061 | 107 | static struct regulator_ops fixed_voltage_ops = { |
9d442061 MB |
108 | }; |
109 | ||
a5023574 | 110 | static int reg_fixed_voltage_probe(struct platform_device *pdev) |
4b74ff65 | 111 | { |
22d881c0 | 112 | struct fixed_voltage_config *config; |
4b74ff65 | 113 | struct fixed_voltage_data *drvdata; |
c172708d | 114 | struct regulator_config cfg = { }; |
4b74ff65 MB |
115 | int ret; |
116 | ||
072e78b1 JMC |
117 | drvdata = devm_kzalloc(&pdev->dev, sizeof(struct fixed_voltage_data), |
118 | GFP_KERNEL); | |
119 | if (!drvdata) | |
120 | return -ENOMEM; | |
121 | ||
f141822b | 122 | if (pdev->dev.of_node) { |
072e78b1 JMC |
123 | config = of_get_fixed_voltage_config(&pdev->dev, |
124 | &drvdata->desc); | |
f141822b SW |
125 | if (IS_ERR(config)) |
126 | return PTR_ERR(config); | |
127 | } else { | |
dff91d0b | 128 | config = dev_get_platdata(&pdev->dev); |
f141822b | 129 | } |
22d881c0 AL |
130 | |
131 | if (!config) | |
132 | return -ENOMEM; | |
cef49102 | 133 | |
84d0ffbe MB |
134 | drvdata->desc.name = devm_kstrdup(&pdev->dev, |
135 | config->supply_name, | |
136 | GFP_KERNEL); | |
4b74ff65 | 137 | if (drvdata->desc.name == NULL) { |
c53ad7fe | 138 | dev_err(&pdev->dev, "Failed to allocate supply name\n"); |
84d0ffbe | 139 | return -ENOMEM; |
4b74ff65 MB |
140 | } |
141 | drvdata->desc.type = REGULATOR_VOLTAGE; | |
142 | drvdata->desc.owner = THIS_MODULE; | |
25a53dfb | 143 | drvdata->desc.ops = &fixed_voltage_ops; |
1c37f8a8 | 144 | |
3d0f267f MB |
145 | drvdata->desc.enable_time = config->startup_delay; |
146 | ||
6be5bfc3 | 147 | if (config->input_supply) { |
84d0ffbe MB |
148 | drvdata->desc.supply_name = devm_kstrdup(&pdev->dev, |
149 | config->input_supply, | |
150 | GFP_KERNEL); | |
6be5bfc3 LD |
151 | if (!drvdata->desc.supply_name) { |
152 | dev_err(&pdev->dev, | |
153 | "Failed to allocate input supply\n"); | |
84d0ffbe | 154 | return -ENOMEM; |
6be5bfc3 LD |
155 | } |
156 | } | |
157 | ||
1c37f8a8 SH |
158 | if (config->microvolts) |
159 | drvdata->desc.n_voltages = 1; | |
4b74ff65 | 160 | |
c368e5fc | 161 | drvdata->desc.fixed_uV = config->microvolts; |
9d442061 | 162 | |
5315fe2f | 163 | if (gpio_is_valid(config->gpio)) { |
25a53dfb | 164 | cfg.ena_gpio = config->gpio; |
1de3821a MP |
165 | if (pdev->dev.of_node) |
166 | cfg.ena_gpio_initialized = true; | |
167 | } | |
25a53dfb MB |
168 | cfg.ena_gpio_invert = !config->enable_high; |
169 | if (config->enabled_at_boot) { | |
609d5f6d | 170 | if (config->enable_high) |
25a53dfb | 171 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH; |
609d5f6d | 172 | else |
25a53dfb | 173 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW; |
86d9884b | 174 | } else { |
609d5f6d | 175 | if (config->enable_high) |
25a53dfb | 176 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW; |
609d5f6d | 177 | else |
25a53dfb | 178 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH; |
86d9884b | 179 | } |
25a53dfb MB |
180 | if (config->gpio_is_open_drain) |
181 | cfg.ena_gpio_flags |= GPIOF_OPEN_DRAIN; | |
4b74ff65 | 182 | |
c172708d MB |
183 | cfg.dev = &pdev->dev; |
184 | cfg.init_data = config->init_data; | |
185 | cfg.driver_data = drvdata; | |
186 | cfg.of_node = pdev->dev.of_node; | |
187 | ||
84d0ffbe MB |
188 | drvdata->dev = devm_regulator_register(&pdev->dev, &drvdata->desc, |
189 | &cfg); | |
4b74ff65 MB |
190 | if (IS_ERR(drvdata->dev)) { |
191 | ret = PTR_ERR(drvdata->dev); | |
c53ad7fe | 192 | dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret); |
84d0ffbe | 193 | return ret; |
4b74ff65 MB |
194 | } |
195 | ||
196 | platform_set_drvdata(pdev, drvdata); | |
197 | ||
198 | dev_dbg(&pdev->dev, "%s supplying %duV\n", drvdata->desc.name, | |
c368e5fc | 199 | drvdata->desc.fixed_uV); |
4b74ff65 MB |
200 | |
201 | return 0; | |
4b74ff65 MB |
202 | } |
203 | ||
cef49102 | 204 | #if defined(CONFIG_OF) |
3d68dfe3 | 205 | static const struct of_device_id fixed_of_match[] = { |
cef49102 RN |
206 | { .compatible = "regulator-fixed", }, |
207 | {}, | |
208 | }; | |
209 | MODULE_DEVICE_TABLE(of, fixed_of_match); | |
cef49102 RN |
210 | #endif |
211 | ||
4b74ff65 | 212 | static struct platform_driver regulator_fixed_voltage_driver = { |
8ab3343d | 213 | .probe = reg_fixed_voltage_probe, |
4b74ff65 MB |
214 | .driver = { |
215 | .name = "reg-fixed-voltage", | |
abcfaf23 | 216 | .of_match_table = of_match_ptr(fixed_of_match), |
4b74ff65 MB |
217 | }, |
218 | }; | |
219 | ||
220 | static int __init regulator_fixed_voltage_init(void) | |
221 | { | |
222 | return platform_driver_register(®ulator_fixed_voltage_driver); | |
223 | } | |
5a1b22be | 224 | subsys_initcall(regulator_fixed_voltage_init); |
4b74ff65 MB |
225 | |
226 | static void __exit regulator_fixed_voltage_exit(void) | |
227 | { | |
228 | platform_driver_unregister(®ulator_fixed_voltage_driver); | |
229 | } | |
230 | module_exit(regulator_fixed_voltage_exit); | |
231 | ||
232 | MODULE_AUTHOR("Mark Brown <broonie@opensource.wolfsonmicro.com>"); | |
233 | MODULE_DESCRIPTION("Fixed voltage regulator"); | |
234 | MODULE_LICENSE("GPL"); | |
38c53c89 | 235 | MODULE_ALIAS("platform:reg-fixed-voltage"); |