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3f0292ae HS |
1 | /* |
2 | * gpio-regulator.c | |
3 | * | |
4 | * Copyright 2011 Heiko Stuebner <heiko@sntech.de> | |
5 | * | |
6 | * based on fixed.c | |
7 | * | |
8 | * Copyright 2008 Wolfson Microelectronics PLC. | |
9 | * | |
10 | * Author: Mark Brown <broonie@opensource.wolfsonmicro.com> | |
11 | * | |
12 | * Copyright (c) 2009 Nokia Corporation | |
13 | * Roger Quadros <ext-roger.quadros@nokia.com> | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or | |
16 | * modify it under the terms of the GNU General Public License as | |
17 | * published by the Free Software Foundation; either version 2 of the | |
18 | * License, or (at your option) any later version. | |
19 | * | |
20 | * This is useful for systems with mixed controllable and | |
21 | * non-controllable regulators, as well as for allowing testing on | |
22 | * systems with no controllable regulators. | |
23 | */ | |
24 | ||
25 | #include <linux/err.h> | |
26 | #include <linux/mutex.h> | |
ecc37edf | 27 | #include <linux/module.h> |
3f0292ae HS |
28 | #include <linux/platform_device.h> |
29 | #include <linux/regulator/driver.h> | |
30 | #include <linux/regulator/machine.h> | |
31 | #include <linux/regulator/gpio-regulator.h> | |
32 | #include <linux/gpio.h> | |
3f0292ae HS |
33 | #include <linux/slab.h> |
34 | ||
35 | struct gpio_regulator_data { | |
36 | struct regulator_desc desc; | |
37 | struct regulator_dev *dev; | |
38 | ||
3f0292ae HS |
39 | struct gpio *gpios; |
40 | int nr_gpios; | |
41 | ||
42 | struct gpio_regulator_state *states; | |
43 | int nr_states; | |
44 | ||
45 | int state; | |
46 | }; | |
47 | ||
3f0292ae HS |
48 | static int gpio_regulator_get_value(struct regulator_dev *dev) |
49 | { | |
50 | struct gpio_regulator_data *data = rdev_get_drvdata(dev); | |
51 | int ptr; | |
52 | ||
53 | for (ptr = 0; ptr < data->nr_states; ptr++) | |
54 | if (data->states[ptr].gpios == data->state) | |
55 | return data->states[ptr].value; | |
56 | ||
57 | return -EINVAL; | |
58 | } | |
59 | ||
60 | static int gpio_regulator_set_value(struct regulator_dev *dev, | |
b0e4d7bf | 61 | int min, int max, unsigned *selector) |
3f0292ae HS |
62 | { |
63 | struct gpio_regulator_data *data = rdev_get_drvdata(dev); | |
00926369 | 64 | int ptr, target = 0, state, best_val = INT_MAX; |
3f0292ae | 65 | |
3f0292ae | 66 | for (ptr = 0; ptr < data->nr_states; ptr++) |
4dbd8f63 AL |
67 | if (data->states[ptr].value < best_val && |
68 | data->states[ptr].value >= min && | |
00926369 | 69 | data->states[ptr].value <= max) { |
3f0292ae | 70 | target = data->states[ptr].gpios; |
00926369 | 71 | best_val = data->states[ptr].value; |
b0e4d7bf HS |
72 | if (selector) |
73 | *selector = ptr; | |
00926369 | 74 | } |
3f0292ae | 75 | |
4dbd8f63 | 76 | if (best_val == INT_MAX) |
3f0292ae HS |
77 | return -EINVAL; |
78 | ||
79 | for (ptr = 0; ptr < data->nr_gpios; ptr++) { | |
80 | state = (target & (1 << ptr)) >> ptr; | |
81 | gpio_set_value(data->gpios[ptr].gpio, state); | |
82 | } | |
83 | data->state = target; | |
84 | ||
85 | return 0; | |
86 | } | |
87 | ||
88 | static int gpio_regulator_set_voltage(struct regulator_dev *dev, | |
89 | int min_uV, int max_uV, | |
90 | unsigned *selector) | |
91 | { | |
b0e4d7bf | 92 | return gpio_regulator_set_value(dev, min_uV, max_uV, selector); |
3f0292ae HS |
93 | } |
94 | ||
95 | static int gpio_regulator_list_voltage(struct regulator_dev *dev, | |
96 | unsigned selector) | |
97 | { | |
98 | struct gpio_regulator_data *data = rdev_get_drvdata(dev); | |
99 | ||
100 | if (selector >= data->nr_states) | |
101 | return -EINVAL; | |
102 | ||
103 | return data->states[selector].value; | |
104 | } | |
105 | ||
106 | static int gpio_regulator_set_current_limit(struct regulator_dev *dev, | |
107 | int min_uA, int max_uA) | |
108 | { | |
b0e4d7bf | 109 | return gpio_regulator_set_value(dev, min_uA, max_uA, NULL); |
3f0292ae HS |
110 | } |
111 | ||
112 | static struct regulator_ops gpio_regulator_voltage_ops = { | |
3f0292ae HS |
113 | .get_voltage = gpio_regulator_get_value, |
114 | .set_voltage = gpio_regulator_set_voltage, | |
115 | .list_voltage = gpio_regulator_list_voltage, | |
116 | }; | |
117 | ||
118 | static struct regulator_ops gpio_regulator_current_ops = { | |
3f0292ae HS |
119 | .get_current_limit = gpio_regulator_get_value, |
120 | .set_current_limit = gpio_regulator_set_current_limit, | |
121 | }; | |
122 | ||
123 | static int __devinit gpio_regulator_probe(struct platform_device *pdev) | |
124 | { | |
125 | struct gpio_regulator_config *config = pdev->dev.platform_data; | |
126 | struct gpio_regulator_data *drvdata; | |
c172708d | 127 | struct regulator_config cfg = { }; |
3f0292ae HS |
128 | int ptr, ret, state; |
129 | ||
02b55216 MB |
130 | drvdata = devm_kzalloc(&pdev->dev, sizeof(struct gpio_regulator_data), |
131 | GFP_KERNEL); | |
3f0292ae HS |
132 | if (drvdata == NULL) { |
133 | dev_err(&pdev->dev, "Failed to allocate device data\n"); | |
134 | return -ENOMEM; | |
135 | } | |
136 | ||
137 | drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL); | |
138 | if (drvdata->desc.name == NULL) { | |
139 | dev_err(&pdev->dev, "Failed to allocate supply name\n"); | |
140 | ret = -ENOMEM; | |
141 | goto err; | |
142 | } | |
143 | ||
144 | drvdata->gpios = kmemdup(config->gpios, | |
145 | config->nr_gpios * sizeof(struct gpio), | |
146 | GFP_KERNEL); | |
147 | if (drvdata->gpios == NULL) { | |
148 | dev_err(&pdev->dev, "Failed to allocate gpio data\n"); | |
149 | ret = -ENOMEM; | |
150 | goto err_name; | |
151 | } | |
152 | ||
153 | drvdata->states = kmemdup(config->states, | |
154 | config->nr_states * | |
155 | sizeof(struct gpio_regulator_state), | |
156 | GFP_KERNEL); | |
157 | if (drvdata->states == NULL) { | |
158 | dev_err(&pdev->dev, "Failed to allocate state data\n"); | |
159 | ret = -ENOMEM; | |
160 | goto err_memgpio; | |
161 | } | |
162 | drvdata->nr_states = config->nr_states; | |
163 | ||
164 | drvdata->desc.owner = THIS_MODULE; | |
a2a8222b | 165 | drvdata->desc.enable_time = config->startup_delay; |
3f0292ae HS |
166 | |
167 | /* handle regulator type*/ | |
168 | switch (config->type) { | |
169 | case REGULATOR_VOLTAGE: | |
170 | drvdata->desc.type = REGULATOR_VOLTAGE; | |
171 | drvdata->desc.ops = &gpio_regulator_voltage_ops; | |
172 | drvdata->desc.n_voltages = config->nr_states; | |
173 | break; | |
174 | case REGULATOR_CURRENT: | |
175 | drvdata->desc.type = REGULATOR_CURRENT; | |
176 | drvdata->desc.ops = &gpio_regulator_current_ops; | |
177 | break; | |
178 | default: | |
179 | dev_err(&pdev->dev, "No regulator type set\n"); | |
180 | ret = -EINVAL; | |
181 | goto err_memgpio; | |
182 | break; | |
183 | } | |
184 | ||
3f0292ae HS |
185 | drvdata->nr_gpios = config->nr_gpios; |
186 | ret = gpio_request_array(drvdata->gpios, drvdata->nr_gpios); | |
187 | if (ret) { | |
188 | dev_err(&pdev->dev, | |
189 | "Could not obtain regulator setting GPIOs: %d\n", ret); | |
4b7c948f | 190 | goto err_memstate; |
3f0292ae HS |
191 | } |
192 | ||
193 | /* build initial state from gpio init data. */ | |
194 | state = 0; | |
195 | for (ptr = 0; ptr < drvdata->nr_gpios; ptr++) { | |
196 | if (config->gpios[ptr].flags & GPIOF_OUT_INIT_HIGH) | |
197 | state |= (1 << ptr); | |
198 | } | |
199 | drvdata->state = state; | |
200 | ||
c172708d MB |
201 | cfg.dev = &pdev->dev; |
202 | cfg.init_data = config->init_data; | |
7d4be2f5 | 203 | cfg.driver_data = drvdata; |
c172708d | 204 | |
4b7c948f AL |
205 | if (config->enable_gpio >= 0) |
206 | cfg.ena_gpio = config->enable_gpio; | |
207 | cfg.ena_gpio_invert = !config->enable_high; | |
208 | if (config->enabled_at_boot) { | |
209 | if (config->enable_high) | |
210 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH; | |
211 | else | |
212 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW; | |
213 | } else { | |
214 | if (config->enable_high) | |
215 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW; | |
216 | else | |
217 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH; | |
218 | } | |
219 | ||
c172708d | 220 | drvdata->dev = regulator_register(&drvdata->desc, &cfg); |
3f0292ae HS |
221 | if (IS_ERR(drvdata->dev)) { |
222 | ret = PTR_ERR(drvdata->dev); | |
223 | dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret); | |
224 | goto err_stategpio; | |
225 | } | |
226 | ||
227 | platform_set_drvdata(pdev, drvdata); | |
228 | ||
229 | return 0; | |
230 | ||
231 | err_stategpio: | |
232 | gpio_free_array(drvdata->gpios, drvdata->nr_gpios); | |
3f0292ae HS |
233 | err_memstate: |
234 | kfree(drvdata->states); | |
235 | err_memgpio: | |
236 | kfree(drvdata->gpios); | |
237 | err_name: | |
238 | kfree(drvdata->desc.name); | |
239 | err: | |
3f0292ae HS |
240 | return ret; |
241 | } | |
242 | ||
243 | static int __devexit gpio_regulator_remove(struct platform_device *pdev) | |
244 | { | |
245 | struct gpio_regulator_data *drvdata = platform_get_drvdata(pdev); | |
246 | ||
247 | regulator_unregister(drvdata->dev); | |
248 | ||
249 | gpio_free_array(drvdata->gpios, drvdata->nr_gpios); | |
250 | ||
251 | kfree(drvdata->states); | |
252 | kfree(drvdata->gpios); | |
253 | ||
3f0292ae | 254 | kfree(drvdata->desc.name); |
3f0292ae HS |
255 | |
256 | return 0; | |
257 | } | |
258 | ||
259 | static struct platform_driver gpio_regulator_driver = { | |
260 | .probe = gpio_regulator_probe, | |
261 | .remove = __devexit_p(gpio_regulator_remove), | |
262 | .driver = { | |
263 | .name = "gpio-regulator", | |
264 | .owner = THIS_MODULE, | |
265 | }, | |
266 | }; | |
267 | ||
268 | static int __init gpio_regulator_init(void) | |
269 | { | |
270 | return platform_driver_register(&gpio_regulator_driver); | |
271 | } | |
272 | subsys_initcall(gpio_regulator_init); | |
273 | ||
274 | static void __exit gpio_regulator_exit(void) | |
275 | { | |
276 | platform_driver_unregister(&gpio_regulator_driver); | |
277 | } | |
278 | module_exit(gpio_regulator_exit); | |
279 | ||
280 | MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); | |
281 | MODULE_DESCRIPTION("gpio voltage regulator"); | |
282 | MODULE_LICENSE("GPL"); | |
283 | MODULE_ALIAS("platform:gpio-regulator"); |