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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 | ||
eb0c5686 HS |
60 | static int gpio_regulator_set_voltage(struct regulator_dev *dev, |
61 | int min_uV, int max_uV, | |
62 | unsigned *selector) | |
3f0292ae HS |
63 | { |
64 | struct gpio_regulator_data *data = rdev_get_drvdata(dev); | |
00926369 | 65 | int ptr, target = 0, state, best_val = INT_MAX; |
3f0292ae | 66 | |
3f0292ae | 67 | for (ptr = 0; ptr < data->nr_states; ptr++) |
4dbd8f63 | 68 | if (data->states[ptr].value < best_val && |
eb0c5686 HS |
69 | data->states[ptr].value >= min_uV && |
70 | data->states[ptr].value <= max_uV) { | |
3f0292ae | 71 | target = data->states[ptr].gpios; |
00926369 | 72 | best_val = data->states[ptr].value; |
b0e4d7bf HS |
73 | if (selector) |
74 | *selector = ptr; | |
00926369 | 75 | } |
3f0292ae | 76 | |
4dbd8f63 | 77 | if (best_val == INT_MAX) |
3f0292ae HS |
78 | return -EINVAL; |
79 | ||
80 | for (ptr = 0; ptr < data->nr_gpios; ptr++) { | |
81 | state = (target & (1 << ptr)) >> ptr; | |
82 | gpio_set_value(data->gpios[ptr].gpio, state); | |
83 | } | |
84 | data->state = target; | |
85 | ||
86 | return 0; | |
87 | } | |
88 | ||
3f0292ae HS |
89 | static int gpio_regulator_list_voltage(struct regulator_dev *dev, |
90 | unsigned selector) | |
91 | { | |
92 | struct gpio_regulator_data *data = rdev_get_drvdata(dev); | |
93 | ||
94 | if (selector >= data->nr_states) | |
95 | return -EINVAL; | |
96 | ||
97 | return data->states[selector].value; | |
98 | } | |
99 | ||
100 | static int gpio_regulator_set_current_limit(struct regulator_dev *dev, | |
101 | int min_uA, int max_uA) | |
102 | { | |
eb0c5686 HS |
103 | struct gpio_regulator_data *data = rdev_get_drvdata(dev); |
104 | int ptr, target = 0, state, best_val = 0; | |
105 | ||
106 | for (ptr = 0; ptr < data->nr_states; ptr++) | |
107 | if (data->states[ptr].value > best_val && | |
108 | data->states[ptr].value >= min_uA && | |
109 | data->states[ptr].value <= max_uA) { | |
110 | target = data->states[ptr].gpios; | |
111 | best_val = data->states[ptr].value; | |
112 | } | |
113 | ||
114 | if (best_val == 0) | |
115 | return -EINVAL; | |
116 | ||
117 | for (ptr = 0; ptr < data->nr_gpios; ptr++) { | |
118 | state = (target & (1 << ptr)) >> ptr; | |
119 | gpio_set_value(data->gpios[ptr].gpio, state); | |
120 | } | |
121 | data->state = target; | |
122 | ||
123 | return 0; | |
3f0292ae HS |
124 | } |
125 | ||
126 | static struct regulator_ops gpio_regulator_voltage_ops = { | |
3f0292ae HS |
127 | .get_voltage = gpio_regulator_get_value, |
128 | .set_voltage = gpio_regulator_set_voltage, | |
129 | .list_voltage = gpio_regulator_list_voltage, | |
130 | }; | |
131 | ||
132 | static struct regulator_ops gpio_regulator_current_ops = { | |
3f0292ae HS |
133 | .get_current_limit = gpio_regulator_get_value, |
134 | .set_current_limit = gpio_regulator_set_current_limit, | |
135 | }; | |
136 | ||
137 | static int __devinit gpio_regulator_probe(struct platform_device *pdev) | |
138 | { | |
139 | struct gpio_regulator_config *config = pdev->dev.platform_data; | |
140 | struct gpio_regulator_data *drvdata; | |
c172708d | 141 | struct regulator_config cfg = { }; |
3f0292ae HS |
142 | int ptr, ret, state; |
143 | ||
02b55216 MB |
144 | drvdata = devm_kzalloc(&pdev->dev, sizeof(struct gpio_regulator_data), |
145 | GFP_KERNEL); | |
3f0292ae HS |
146 | if (drvdata == NULL) { |
147 | dev_err(&pdev->dev, "Failed to allocate device data\n"); | |
148 | return -ENOMEM; | |
149 | } | |
150 | ||
151 | drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL); | |
152 | if (drvdata->desc.name == NULL) { | |
153 | dev_err(&pdev->dev, "Failed to allocate supply name\n"); | |
154 | ret = -ENOMEM; | |
155 | goto err; | |
156 | } | |
157 | ||
158 | drvdata->gpios = kmemdup(config->gpios, | |
159 | config->nr_gpios * sizeof(struct gpio), | |
160 | GFP_KERNEL); | |
161 | if (drvdata->gpios == NULL) { | |
162 | dev_err(&pdev->dev, "Failed to allocate gpio data\n"); | |
163 | ret = -ENOMEM; | |
164 | goto err_name; | |
165 | } | |
166 | ||
167 | drvdata->states = kmemdup(config->states, | |
168 | config->nr_states * | |
169 | sizeof(struct gpio_regulator_state), | |
170 | GFP_KERNEL); | |
171 | if (drvdata->states == NULL) { | |
172 | dev_err(&pdev->dev, "Failed to allocate state data\n"); | |
173 | ret = -ENOMEM; | |
174 | goto err_memgpio; | |
175 | } | |
176 | drvdata->nr_states = config->nr_states; | |
177 | ||
178 | drvdata->desc.owner = THIS_MODULE; | |
a2a8222b | 179 | drvdata->desc.enable_time = config->startup_delay; |
3f0292ae HS |
180 | |
181 | /* handle regulator type*/ | |
182 | switch (config->type) { | |
183 | case REGULATOR_VOLTAGE: | |
184 | drvdata->desc.type = REGULATOR_VOLTAGE; | |
185 | drvdata->desc.ops = &gpio_regulator_voltage_ops; | |
186 | drvdata->desc.n_voltages = config->nr_states; | |
187 | break; | |
188 | case REGULATOR_CURRENT: | |
189 | drvdata->desc.type = REGULATOR_CURRENT; | |
190 | drvdata->desc.ops = &gpio_regulator_current_ops; | |
191 | break; | |
192 | default: | |
193 | dev_err(&pdev->dev, "No regulator type set\n"); | |
194 | ret = -EINVAL; | |
195 | goto err_memgpio; | |
196 | break; | |
197 | } | |
198 | ||
3f0292ae HS |
199 | drvdata->nr_gpios = config->nr_gpios; |
200 | ret = gpio_request_array(drvdata->gpios, drvdata->nr_gpios); | |
201 | if (ret) { | |
202 | dev_err(&pdev->dev, | |
203 | "Could not obtain regulator setting GPIOs: %d\n", ret); | |
4b7c948f | 204 | goto err_memstate; |
3f0292ae HS |
205 | } |
206 | ||
207 | /* build initial state from gpio init data. */ | |
208 | state = 0; | |
209 | for (ptr = 0; ptr < drvdata->nr_gpios; ptr++) { | |
210 | if (config->gpios[ptr].flags & GPIOF_OUT_INIT_HIGH) | |
211 | state |= (1 << ptr); | |
212 | } | |
213 | drvdata->state = state; | |
214 | ||
c172708d MB |
215 | cfg.dev = &pdev->dev; |
216 | cfg.init_data = config->init_data; | |
7d4be2f5 | 217 | cfg.driver_data = drvdata; |
c172708d | 218 | |
4b7c948f AL |
219 | if (config->enable_gpio >= 0) |
220 | cfg.ena_gpio = config->enable_gpio; | |
221 | cfg.ena_gpio_invert = !config->enable_high; | |
222 | if (config->enabled_at_boot) { | |
223 | if (config->enable_high) | |
224 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH; | |
225 | else | |
226 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW; | |
227 | } else { | |
228 | if (config->enable_high) | |
229 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW; | |
230 | else | |
231 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH; | |
232 | } | |
233 | ||
c172708d | 234 | drvdata->dev = regulator_register(&drvdata->desc, &cfg); |
3f0292ae HS |
235 | if (IS_ERR(drvdata->dev)) { |
236 | ret = PTR_ERR(drvdata->dev); | |
237 | dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret); | |
238 | goto err_stategpio; | |
239 | } | |
240 | ||
241 | platform_set_drvdata(pdev, drvdata); | |
242 | ||
243 | return 0; | |
244 | ||
245 | err_stategpio: | |
246 | gpio_free_array(drvdata->gpios, drvdata->nr_gpios); | |
3f0292ae HS |
247 | err_memstate: |
248 | kfree(drvdata->states); | |
249 | err_memgpio: | |
250 | kfree(drvdata->gpios); | |
251 | err_name: | |
252 | kfree(drvdata->desc.name); | |
253 | err: | |
3f0292ae HS |
254 | return ret; |
255 | } | |
256 | ||
257 | static int __devexit gpio_regulator_remove(struct platform_device *pdev) | |
258 | { | |
259 | struct gpio_regulator_data *drvdata = platform_get_drvdata(pdev); | |
260 | ||
261 | regulator_unregister(drvdata->dev); | |
262 | ||
263 | gpio_free_array(drvdata->gpios, drvdata->nr_gpios); | |
264 | ||
265 | kfree(drvdata->states); | |
266 | kfree(drvdata->gpios); | |
267 | ||
3f0292ae | 268 | kfree(drvdata->desc.name); |
3f0292ae HS |
269 | |
270 | return 0; | |
271 | } | |
272 | ||
273 | static struct platform_driver gpio_regulator_driver = { | |
274 | .probe = gpio_regulator_probe, | |
275 | .remove = __devexit_p(gpio_regulator_remove), | |
276 | .driver = { | |
277 | .name = "gpio-regulator", | |
278 | .owner = THIS_MODULE, | |
279 | }, | |
280 | }; | |
281 | ||
282 | static int __init gpio_regulator_init(void) | |
283 | { | |
284 | return platform_driver_register(&gpio_regulator_driver); | |
285 | } | |
286 | subsys_initcall(gpio_regulator_init); | |
287 | ||
288 | static void __exit gpio_regulator_exit(void) | |
289 | { | |
290 | platform_driver_unregister(&gpio_regulator_driver); | |
291 | } | |
292 | module_exit(gpio_regulator_exit); | |
293 | ||
294 | MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); | |
295 | MODULE_DESCRIPTION("gpio voltage regulator"); | |
296 | MODULE_LICENSE("GPL"); | |
297 | MODULE_ALIAS("platform:gpio-regulator"); |