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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> | |
006694d0 | 31 | #include <linux/regulator/of_regulator.h> |
3f0292ae HS |
32 | #include <linux/regulator/gpio-regulator.h> |
33 | #include <linux/gpio.h> | |
3f0292ae | 34 | #include <linux/slab.h> |
006694d0 LJ |
35 | #include <linux/of.h> |
36 | #include <linux/of_gpio.h> | |
3f0292ae HS |
37 | |
38 | struct gpio_regulator_data { | |
39 | struct regulator_desc desc; | |
40 | struct regulator_dev *dev; | |
41 | ||
3f0292ae HS |
42 | struct gpio *gpios; |
43 | int nr_gpios; | |
44 | ||
45 | struct gpio_regulator_state *states; | |
46 | int nr_states; | |
47 | ||
48 | int state; | |
49 | }; | |
50 | ||
3f0292ae HS |
51 | static int gpio_regulator_get_value(struct regulator_dev *dev) |
52 | { | |
53 | struct gpio_regulator_data *data = rdev_get_drvdata(dev); | |
54 | int ptr; | |
55 | ||
56 | for (ptr = 0; ptr < data->nr_states; ptr++) | |
57 | if (data->states[ptr].gpios == data->state) | |
58 | return data->states[ptr].value; | |
59 | ||
60 | return -EINVAL; | |
61 | } | |
62 | ||
eb0c5686 HS |
63 | static int gpio_regulator_set_voltage(struct regulator_dev *dev, |
64 | int min_uV, int max_uV, | |
65 | unsigned *selector) | |
3f0292ae HS |
66 | { |
67 | struct gpio_regulator_data *data = rdev_get_drvdata(dev); | |
00926369 | 68 | int ptr, target = 0, state, best_val = INT_MAX; |
3f0292ae | 69 | |
3f0292ae | 70 | for (ptr = 0; ptr < data->nr_states; ptr++) |
4dbd8f63 | 71 | if (data->states[ptr].value < best_val && |
eb0c5686 HS |
72 | data->states[ptr].value >= min_uV && |
73 | data->states[ptr].value <= max_uV) { | |
3f0292ae | 74 | target = data->states[ptr].gpios; |
00926369 | 75 | best_val = data->states[ptr].value; |
b0e4d7bf HS |
76 | if (selector) |
77 | *selector = ptr; | |
00926369 | 78 | } |
3f0292ae | 79 | |
4dbd8f63 | 80 | if (best_val == INT_MAX) |
3f0292ae HS |
81 | return -EINVAL; |
82 | ||
83 | for (ptr = 0; ptr < data->nr_gpios; ptr++) { | |
84 | state = (target & (1 << ptr)) >> ptr; | |
85 | gpio_set_value(data->gpios[ptr].gpio, state); | |
86 | } | |
87 | data->state = target; | |
88 | ||
89 | return 0; | |
90 | } | |
91 | ||
3f0292ae HS |
92 | static int gpio_regulator_list_voltage(struct regulator_dev *dev, |
93 | unsigned selector) | |
94 | { | |
95 | struct gpio_regulator_data *data = rdev_get_drvdata(dev); | |
96 | ||
97 | if (selector >= data->nr_states) | |
98 | return -EINVAL; | |
99 | ||
100 | return data->states[selector].value; | |
101 | } | |
102 | ||
103 | static int gpio_regulator_set_current_limit(struct regulator_dev *dev, | |
104 | int min_uA, int max_uA) | |
105 | { | |
eb0c5686 HS |
106 | struct gpio_regulator_data *data = rdev_get_drvdata(dev); |
107 | int ptr, target = 0, state, best_val = 0; | |
108 | ||
109 | for (ptr = 0; ptr < data->nr_states; ptr++) | |
110 | if (data->states[ptr].value > best_val && | |
111 | data->states[ptr].value >= min_uA && | |
112 | data->states[ptr].value <= max_uA) { | |
113 | target = data->states[ptr].gpios; | |
114 | best_val = data->states[ptr].value; | |
115 | } | |
116 | ||
117 | if (best_val == 0) | |
118 | return -EINVAL; | |
119 | ||
120 | for (ptr = 0; ptr < data->nr_gpios; ptr++) { | |
121 | state = (target & (1 << ptr)) >> ptr; | |
122 | gpio_set_value(data->gpios[ptr].gpio, state); | |
123 | } | |
124 | data->state = target; | |
125 | ||
126 | return 0; | |
3f0292ae HS |
127 | } |
128 | ||
129 | static struct regulator_ops gpio_regulator_voltage_ops = { | |
3f0292ae HS |
130 | .get_voltage = gpio_regulator_get_value, |
131 | .set_voltage = gpio_regulator_set_voltage, | |
132 | .list_voltage = gpio_regulator_list_voltage, | |
133 | }; | |
134 | ||
006694d0 LJ |
135 | struct gpio_regulator_config * |
136 | of_get_gpio_regulator_config(struct device *dev, struct device_node *np) | |
137 | { | |
138 | struct gpio_regulator_config *config; | |
139 | struct property *prop; | |
140 | const char *regtype; | |
141 | int proplen, gpio, i; | |
142 | ||
143 | config = devm_kzalloc(dev, | |
144 | sizeof(struct gpio_regulator_config), | |
145 | GFP_KERNEL); | |
146 | if (!config) | |
147 | return ERR_PTR(-ENOMEM); | |
148 | ||
149 | config->init_data = of_get_regulator_init_data(dev, np); | |
150 | if (!config->init_data) | |
151 | return ERR_PTR(-EINVAL); | |
152 | ||
153 | config->supply_name = config->init_data->constraints.name; | |
154 | ||
155 | if (of_property_read_bool(np, "enable-active-high")) | |
156 | config->enable_high = true; | |
157 | ||
158 | if (of_property_read_bool(np, "enable-at-boot")) | |
159 | config->enabled_at_boot = true; | |
160 | ||
161 | of_property_read_u32(np, "startup-delay-us", &config->startup_delay); | |
162 | ||
163 | config->enable_gpio = of_get_named_gpio(np, "enable-gpio", 0); | |
164 | ||
165 | /* Fetch GPIOs. */ | |
166 | for (i = 0; ; i++) | |
167 | if (of_get_named_gpio(np, "gpios", i) < 0) | |
168 | break; | |
169 | config->nr_gpios = i; | |
170 | ||
171 | config->gpios = devm_kzalloc(dev, | |
172 | sizeof(struct gpio) * config->nr_gpios, | |
173 | GFP_KERNEL); | |
174 | if (!config->gpios) | |
175 | return ERR_PTR(-ENOMEM); | |
176 | ||
177 | for (i = 0; config->nr_gpios; i++) { | |
178 | gpio = of_get_named_gpio(np, "gpios", i); | |
179 | if (gpio < 0) | |
180 | break; | |
181 | config->gpios[i].gpio = gpio; | |
182 | } | |
183 | ||
184 | /* Fetch states. */ | |
185 | prop = of_find_property(np, "states", NULL); | |
186 | proplen = prop->length / sizeof(int); | |
187 | ||
188 | config->states = devm_kzalloc(dev, | |
189 | sizeof(struct gpio_regulator_state) | |
190 | * (proplen / 2), | |
191 | GFP_KERNEL); | |
192 | if (!config->states) | |
193 | return ERR_PTR(-ENOMEM); | |
194 | ||
195 | for (i = 0; i < proplen / 2; i++) { | |
196 | config->states[i].value = | |
197 | be32_to_cpup((int *)prop->value + (i * 2)); | |
198 | config->states[i].gpios = | |
199 | be32_to_cpup((int *)prop->value + (i * 2 + 1)); | |
200 | } | |
201 | config->nr_states = i; | |
202 | ||
203 | of_property_read_string(np, "regulator-type", ®type); | |
204 | ||
205 | if (!strncmp("voltage", regtype, 7)) | |
206 | config->type = REGULATOR_VOLTAGE; | |
207 | else if (!strncmp("current", regtype, 7)) | |
208 | config->type = REGULATOR_CURRENT; | |
209 | ||
210 | return config; | |
211 | } | |
212 | ||
3f0292ae | 213 | static struct regulator_ops gpio_regulator_current_ops = { |
3f0292ae HS |
214 | .get_current_limit = gpio_regulator_get_value, |
215 | .set_current_limit = gpio_regulator_set_current_limit, | |
216 | }; | |
217 | ||
218 | static int __devinit gpio_regulator_probe(struct platform_device *pdev) | |
219 | { | |
220 | struct gpio_regulator_config *config = pdev->dev.platform_data; | |
006694d0 | 221 | struct device_node *np = pdev->dev.of_node; |
3f0292ae | 222 | struct gpio_regulator_data *drvdata; |
c172708d | 223 | struct regulator_config cfg = { }; |
3f0292ae HS |
224 | int ptr, ret, state; |
225 | ||
006694d0 LJ |
226 | if (np) { |
227 | config = of_get_gpio_regulator_config(&pdev->dev, np); | |
228 | if (IS_ERR(config)) | |
229 | return PTR_ERR(config); | |
230 | } | |
231 | ||
02b55216 MB |
232 | drvdata = devm_kzalloc(&pdev->dev, sizeof(struct gpio_regulator_data), |
233 | GFP_KERNEL); | |
3f0292ae HS |
234 | if (drvdata == NULL) { |
235 | dev_err(&pdev->dev, "Failed to allocate device data\n"); | |
236 | return -ENOMEM; | |
237 | } | |
238 | ||
239 | drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL); | |
240 | if (drvdata->desc.name == NULL) { | |
241 | dev_err(&pdev->dev, "Failed to allocate supply name\n"); | |
242 | ret = -ENOMEM; | |
243 | goto err; | |
244 | } | |
245 | ||
246 | drvdata->gpios = kmemdup(config->gpios, | |
247 | config->nr_gpios * sizeof(struct gpio), | |
248 | GFP_KERNEL); | |
249 | if (drvdata->gpios == NULL) { | |
250 | dev_err(&pdev->dev, "Failed to allocate gpio data\n"); | |
251 | ret = -ENOMEM; | |
252 | goto err_name; | |
253 | } | |
254 | ||
255 | drvdata->states = kmemdup(config->states, | |
256 | config->nr_states * | |
257 | sizeof(struct gpio_regulator_state), | |
258 | GFP_KERNEL); | |
259 | if (drvdata->states == NULL) { | |
260 | dev_err(&pdev->dev, "Failed to allocate state data\n"); | |
261 | ret = -ENOMEM; | |
262 | goto err_memgpio; | |
263 | } | |
264 | drvdata->nr_states = config->nr_states; | |
265 | ||
266 | drvdata->desc.owner = THIS_MODULE; | |
a2a8222b | 267 | drvdata->desc.enable_time = config->startup_delay; |
3f0292ae HS |
268 | |
269 | /* handle regulator type*/ | |
270 | switch (config->type) { | |
271 | case REGULATOR_VOLTAGE: | |
272 | drvdata->desc.type = REGULATOR_VOLTAGE; | |
273 | drvdata->desc.ops = &gpio_regulator_voltage_ops; | |
274 | drvdata->desc.n_voltages = config->nr_states; | |
275 | break; | |
276 | case REGULATOR_CURRENT: | |
277 | drvdata->desc.type = REGULATOR_CURRENT; | |
278 | drvdata->desc.ops = &gpio_regulator_current_ops; | |
279 | break; | |
280 | default: | |
281 | dev_err(&pdev->dev, "No regulator type set\n"); | |
282 | ret = -EINVAL; | |
283 | goto err_memgpio; | |
284 | break; | |
285 | } | |
286 | ||
3f0292ae HS |
287 | drvdata->nr_gpios = config->nr_gpios; |
288 | ret = gpio_request_array(drvdata->gpios, drvdata->nr_gpios); | |
289 | if (ret) { | |
290 | dev_err(&pdev->dev, | |
291 | "Could not obtain regulator setting GPIOs: %d\n", ret); | |
4b7c948f | 292 | goto err_memstate; |
3f0292ae HS |
293 | } |
294 | ||
295 | /* build initial state from gpio init data. */ | |
296 | state = 0; | |
297 | for (ptr = 0; ptr < drvdata->nr_gpios; ptr++) { | |
298 | if (config->gpios[ptr].flags & GPIOF_OUT_INIT_HIGH) | |
299 | state |= (1 << ptr); | |
300 | } | |
301 | drvdata->state = state; | |
302 | ||
c172708d MB |
303 | cfg.dev = &pdev->dev; |
304 | cfg.init_data = config->init_data; | |
7d4be2f5 | 305 | cfg.driver_data = drvdata; |
c172708d | 306 | |
4b7c948f AL |
307 | if (config->enable_gpio >= 0) |
308 | cfg.ena_gpio = config->enable_gpio; | |
309 | cfg.ena_gpio_invert = !config->enable_high; | |
310 | if (config->enabled_at_boot) { | |
311 | if (config->enable_high) | |
312 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH; | |
313 | else | |
314 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW; | |
315 | } else { | |
316 | if (config->enable_high) | |
317 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW; | |
318 | else | |
319 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH; | |
320 | } | |
321 | ||
c172708d | 322 | drvdata->dev = regulator_register(&drvdata->desc, &cfg); |
3f0292ae HS |
323 | if (IS_ERR(drvdata->dev)) { |
324 | ret = PTR_ERR(drvdata->dev); | |
325 | dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret); | |
326 | goto err_stategpio; | |
327 | } | |
328 | ||
329 | platform_set_drvdata(pdev, drvdata); | |
330 | ||
331 | return 0; | |
332 | ||
333 | err_stategpio: | |
334 | gpio_free_array(drvdata->gpios, drvdata->nr_gpios); | |
3f0292ae HS |
335 | err_memstate: |
336 | kfree(drvdata->states); | |
337 | err_memgpio: | |
338 | kfree(drvdata->gpios); | |
339 | err_name: | |
340 | kfree(drvdata->desc.name); | |
341 | err: | |
3f0292ae HS |
342 | return ret; |
343 | } | |
344 | ||
345 | static int __devexit gpio_regulator_remove(struct platform_device *pdev) | |
346 | { | |
347 | struct gpio_regulator_data *drvdata = platform_get_drvdata(pdev); | |
348 | ||
349 | regulator_unregister(drvdata->dev); | |
350 | ||
351 | gpio_free_array(drvdata->gpios, drvdata->nr_gpios); | |
352 | ||
353 | kfree(drvdata->states); | |
354 | kfree(drvdata->gpios); | |
355 | ||
3f0292ae | 356 | kfree(drvdata->desc.name); |
3f0292ae HS |
357 | |
358 | return 0; | |
359 | } | |
360 | ||
006694d0 LJ |
361 | static const struct of_device_id regulator_gpio_of_match[] __devinitconst = { |
362 | { .compatible = "regulator-gpio", }, | |
363 | {}, | |
364 | }; | |
365 | ||
3f0292ae HS |
366 | static struct platform_driver gpio_regulator_driver = { |
367 | .probe = gpio_regulator_probe, | |
368 | .remove = __devexit_p(gpio_regulator_remove), | |
369 | .driver = { | |
370 | .name = "gpio-regulator", | |
371 | .owner = THIS_MODULE, | |
006694d0 | 372 | .of_match_table = regulator_gpio_of_match, |
3f0292ae HS |
373 | }, |
374 | }; | |
375 | ||
376 | static int __init gpio_regulator_init(void) | |
377 | { | |
378 | return platform_driver_register(&gpio_regulator_driver); | |
379 | } | |
380 | subsys_initcall(gpio_regulator_init); | |
381 | ||
382 | static void __exit gpio_regulator_exit(void) | |
383 | { | |
384 | platform_driver_unregister(&gpio_regulator_driver); | |
385 | } | |
386 | module_exit(gpio_regulator_exit); | |
387 | ||
388 | MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); | |
389 | MODULE_DESCRIPTION("gpio voltage regulator"); | |
390 | MODULE_LICENSE("GPL"); | |
391 | MODULE_ALIAS("platform:gpio-regulator"); |