Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 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> |
Mark Brown | ecc37ed | 2011-10-11 13:59:13 +0100 | [diff] [blame] | 27 | #include <linux/module.h> |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 28 | #include <linux/platform_device.h> |
| 29 | #include <linux/regulator/driver.h> |
| 30 | #include <linux/regulator/machine.h> |
Lee Jones | 006694d | 2012-10-15 14:16:59 +0100 | [diff] [blame] | 31 | #include <linux/regulator/of_regulator.h> |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 32 | #include <linux/regulator/gpio-regulator.h> |
| 33 | #include <linux/gpio.h> |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 34 | #include <linux/slab.h> |
Lee Jones | 006694d | 2012-10-15 14:16:59 +0100 | [diff] [blame] | 35 | #include <linux/of.h> |
| 36 | #include <linux/of_gpio.h> |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 37 | |
| 38 | struct gpio_regulator_data { |
| 39 | struct regulator_desc desc; |
| 40 | struct regulator_dev *dev; |
| 41 | |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 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 | |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 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 | |
Heiko Stübner | eb0c568 | 2012-08-08 00:50:19 +0200 | [diff] [blame] | 63 | static int gpio_regulator_set_voltage(struct regulator_dev *dev, |
| 64 | int min_uV, int max_uV, |
| 65 | unsigned *selector) |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 66 | { |
| 67 | struct gpio_regulator_data *data = rdev_get_drvdata(dev); |
Heiko Stübner | 0092636 | 2012-06-03 21:31:09 +0200 | [diff] [blame] | 68 | int ptr, target = 0, state, best_val = INT_MAX; |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 69 | |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 70 | for (ptr = 0; ptr < data->nr_states; ptr++) |
Axel Lin | 4dbd8f6 | 2012-03-22 14:08:04 +0800 | [diff] [blame] | 71 | if (data->states[ptr].value < best_val && |
Heiko Stübner | eb0c568 | 2012-08-08 00:50:19 +0200 | [diff] [blame] | 72 | data->states[ptr].value >= min_uV && |
| 73 | data->states[ptr].value <= max_uV) { |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 74 | target = data->states[ptr].gpios; |
Heiko Stübner | 0092636 | 2012-06-03 21:31:09 +0200 | [diff] [blame] | 75 | best_val = data->states[ptr].value; |
Heiko Stübner | b0e4d7b | 2012-06-03 21:32:05 +0200 | [diff] [blame] | 76 | if (selector) |
| 77 | *selector = ptr; |
Heiko Stübner | 0092636 | 2012-06-03 21:31:09 +0200 | [diff] [blame] | 78 | } |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 79 | |
Axel Lin | 4dbd8f6 | 2012-03-22 14:08:04 +0800 | [diff] [blame] | 80 | if (best_val == INT_MAX) |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 81 | return -EINVAL; |
| 82 | |
| 83 | for (ptr = 0; ptr < data->nr_gpios; ptr++) { |
| 84 | state = (target & (1 << ptr)) >> ptr; |
Lee Jones | 3708903 | 2012-12-10 08:55:53 +0000 | [diff] [blame] | 85 | gpio_set_value_cansleep(data->gpios[ptr].gpio, state); |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 86 | } |
| 87 | data->state = target; |
| 88 | |
| 89 | return 0; |
| 90 | } |
| 91 | |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 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 | { |
Heiko Stübner | eb0c568 | 2012-08-08 00:50:19 +0200 | [diff] [blame] | 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; |
Lee Jones | 3708903 | 2012-12-10 08:55:53 +0000 | [diff] [blame] | 122 | gpio_set_value_cansleep(data->gpios[ptr].gpio, state); |
Heiko Stübner | eb0c568 | 2012-08-08 00:50:19 +0200 | [diff] [blame] | 123 | } |
| 124 | data->state = target; |
| 125 | |
| 126 | return 0; |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 127 | } |
| 128 | |
| 129 | static struct regulator_ops gpio_regulator_voltage_ops = { |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 130 | .get_voltage = gpio_regulator_get_value, |
| 131 | .set_voltage = gpio_regulator_set_voltage, |
| 132 | .list_voltage = gpio_regulator_list_voltage, |
| 133 | }; |
| 134 | |
Lee Jones | 006694d | 2012-10-15 14:16:59 +0100 | [diff] [blame] | 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 | |
Lee Jones | ad0b8b9 | 2012-12-10 08:55:52 +0000 | [diff] [blame] | 177 | for (i = 0; i < config->nr_gpios; i++) { |
Lee Jones | 006694d | 2012-10-15 14:16:59 +0100 | [diff] [blame] | 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); |
Lee Jones | 216f2b9 | 2012-11-14 11:51:36 +0000 | [diff] [blame] | 186 | if (!prop) { |
| 187 | dev_err(dev, "No 'states' property found\n"); |
| 188 | return ERR_PTR(-EINVAL); |
| 189 | } |
| 190 | |
Lee Jones | 006694d | 2012-10-15 14:16:59 +0100 | [diff] [blame] | 191 | proplen = prop->length / sizeof(int); |
| 192 | |
| 193 | config->states = devm_kzalloc(dev, |
| 194 | sizeof(struct gpio_regulator_state) |
| 195 | * (proplen / 2), |
| 196 | GFP_KERNEL); |
| 197 | if (!config->states) |
| 198 | return ERR_PTR(-ENOMEM); |
| 199 | |
| 200 | for (i = 0; i < proplen / 2; i++) { |
| 201 | config->states[i].value = |
| 202 | be32_to_cpup((int *)prop->value + (i * 2)); |
| 203 | config->states[i].gpios = |
| 204 | be32_to_cpup((int *)prop->value + (i * 2 + 1)); |
| 205 | } |
| 206 | config->nr_states = i; |
| 207 | |
| 208 | of_property_read_string(np, "regulator-type", ®type); |
| 209 | |
| 210 | if (!strncmp("voltage", regtype, 7)) |
| 211 | config->type = REGULATOR_VOLTAGE; |
| 212 | else if (!strncmp("current", regtype, 7)) |
| 213 | config->type = REGULATOR_CURRENT; |
| 214 | |
| 215 | return config; |
| 216 | } |
| 217 | |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 218 | static struct regulator_ops gpio_regulator_current_ops = { |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 219 | .get_current_limit = gpio_regulator_get_value, |
| 220 | .set_current_limit = gpio_regulator_set_current_limit, |
| 221 | }; |
| 222 | |
Bill Pemberton | a502357 | 2012-11-19 13:22:22 -0500 | [diff] [blame] | 223 | static int gpio_regulator_probe(struct platform_device *pdev) |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 224 | { |
| 225 | struct gpio_regulator_config *config = pdev->dev.platform_data; |
Lee Jones | 006694d | 2012-10-15 14:16:59 +0100 | [diff] [blame] | 226 | struct device_node *np = pdev->dev.of_node; |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 227 | struct gpio_regulator_data *drvdata; |
Mark Brown | c172708 | 2012-04-04 00:50:22 +0100 | [diff] [blame] | 228 | struct regulator_config cfg = { }; |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 229 | int ptr, ret, state; |
| 230 | |
Lee Jones | 006694d | 2012-10-15 14:16:59 +0100 | [diff] [blame] | 231 | if (np) { |
| 232 | config = of_get_gpio_regulator_config(&pdev->dev, np); |
| 233 | if (IS_ERR(config)) |
| 234 | return PTR_ERR(config); |
| 235 | } |
| 236 | |
Mark Brown | 02b55216 | 2012-04-03 23:20:56 +0100 | [diff] [blame] | 237 | drvdata = devm_kzalloc(&pdev->dev, sizeof(struct gpio_regulator_data), |
| 238 | GFP_KERNEL); |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 239 | if (drvdata == NULL) { |
| 240 | dev_err(&pdev->dev, "Failed to allocate device data\n"); |
| 241 | return -ENOMEM; |
| 242 | } |
| 243 | |
| 244 | drvdata->desc.name = kstrdup(config->supply_name, GFP_KERNEL); |
| 245 | if (drvdata->desc.name == NULL) { |
| 246 | dev_err(&pdev->dev, "Failed to allocate supply name\n"); |
| 247 | ret = -ENOMEM; |
| 248 | goto err; |
| 249 | } |
| 250 | |
| 251 | drvdata->gpios = kmemdup(config->gpios, |
| 252 | config->nr_gpios * sizeof(struct gpio), |
| 253 | GFP_KERNEL); |
| 254 | if (drvdata->gpios == NULL) { |
| 255 | dev_err(&pdev->dev, "Failed to allocate gpio data\n"); |
| 256 | ret = -ENOMEM; |
| 257 | goto err_name; |
| 258 | } |
| 259 | |
| 260 | drvdata->states = kmemdup(config->states, |
| 261 | config->nr_states * |
| 262 | sizeof(struct gpio_regulator_state), |
| 263 | GFP_KERNEL); |
| 264 | if (drvdata->states == NULL) { |
| 265 | dev_err(&pdev->dev, "Failed to allocate state data\n"); |
| 266 | ret = -ENOMEM; |
| 267 | goto err_memgpio; |
| 268 | } |
| 269 | drvdata->nr_states = config->nr_states; |
| 270 | |
| 271 | drvdata->desc.owner = THIS_MODULE; |
Axel Lin | a2a8222 | 2012-07-04 10:19:46 +0800 | [diff] [blame] | 272 | drvdata->desc.enable_time = config->startup_delay; |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 273 | |
| 274 | /* handle regulator type*/ |
| 275 | switch (config->type) { |
| 276 | case REGULATOR_VOLTAGE: |
| 277 | drvdata->desc.type = REGULATOR_VOLTAGE; |
| 278 | drvdata->desc.ops = &gpio_regulator_voltage_ops; |
| 279 | drvdata->desc.n_voltages = config->nr_states; |
| 280 | break; |
| 281 | case REGULATOR_CURRENT: |
| 282 | drvdata->desc.type = REGULATOR_CURRENT; |
| 283 | drvdata->desc.ops = &gpio_regulator_current_ops; |
| 284 | break; |
| 285 | default: |
| 286 | dev_err(&pdev->dev, "No regulator type set\n"); |
| 287 | ret = -EINVAL; |
| 288 | goto err_memgpio; |
| 289 | break; |
| 290 | } |
| 291 | |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 292 | drvdata->nr_gpios = config->nr_gpios; |
| 293 | ret = gpio_request_array(drvdata->gpios, drvdata->nr_gpios); |
| 294 | if (ret) { |
| 295 | dev_err(&pdev->dev, |
| 296 | "Could not obtain regulator setting GPIOs: %d\n", ret); |
Axel Lin | 4b7c948 | 2012-07-04 10:20:46 +0800 | [diff] [blame] | 297 | goto err_memstate; |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 298 | } |
| 299 | |
| 300 | /* build initial state from gpio init data. */ |
| 301 | state = 0; |
| 302 | for (ptr = 0; ptr < drvdata->nr_gpios; ptr++) { |
| 303 | if (config->gpios[ptr].flags & GPIOF_OUT_INIT_HIGH) |
| 304 | state |= (1 << ptr); |
| 305 | } |
| 306 | drvdata->state = state; |
| 307 | |
Mark Brown | c172708 | 2012-04-04 00:50:22 +0100 | [diff] [blame] | 308 | cfg.dev = &pdev->dev; |
| 309 | cfg.init_data = config->init_data; |
Heiko Stübner | 7d4be2f | 2012-06-03 21:30:33 +0200 | [diff] [blame] | 310 | cfg.driver_data = drvdata; |
Frank Li | f8a9f75 | 2012-11-12 17:59:52 +0800 | [diff] [blame] | 311 | cfg.of_node = np; |
Mark Brown | c172708 | 2012-04-04 00:50:22 +0100 | [diff] [blame] | 312 | |
Axel Lin | 4b7c948 | 2012-07-04 10:20:46 +0800 | [diff] [blame] | 313 | if (config->enable_gpio >= 0) |
| 314 | cfg.ena_gpio = config->enable_gpio; |
| 315 | cfg.ena_gpio_invert = !config->enable_high; |
| 316 | if (config->enabled_at_boot) { |
| 317 | if (config->enable_high) |
| 318 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH; |
| 319 | else |
| 320 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW; |
| 321 | } else { |
| 322 | if (config->enable_high) |
| 323 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_LOW; |
| 324 | else |
| 325 | cfg.ena_gpio_flags |= GPIOF_OUT_INIT_HIGH; |
| 326 | } |
| 327 | |
Mark Brown | c172708 | 2012-04-04 00:50:22 +0100 | [diff] [blame] | 328 | drvdata->dev = regulator_register(&drvdata->desc, &cfg); |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 329 | if (IS_ERR(drvdata->dev)) { |
| 330 | ret = PTR_ERR(drvdata->dev); |
| 331 | dev_err(&pdev->dev, "Failed to register regulator: %d\n", ret); |
| 332 | goto err_stategpio; |
| 333 | } |
| 334 | |
| 335 | platform_set_drvdata(pdev, drvdata); |
| 336 | |
| 337 | return 0; |
| 338 | |
| 339 | err_stategpio: |
| 340 | gpio_free_array(drvdata->gpios, drvdata->nr_gpios); |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 341 | err_memstate: |
| 342 | kfree(drvdata->states); |
| 343 | err_memgpio: |
| 344 | kfree(drvdata->gpios); |
| 345 | err_name: |
| 346 | kfree(drvdata->desc.name); |
| 347 | err: |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 348 | return ret; |
| 349 | } |
| 350 | |
Bill Pemberton | 8dc995f | 2012-11-19 13:26:10 -0500 | [diff] [blame] | 351 | static int gpio_regulator_remove(struct platform_device *pdev) |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 352 | { |
| 353 | struct gpio_regulator_data *drvdata = platform_get_drvdata(pdev); |
| 354 | |
| 355 | regulator_unregister(drvdata->dev); |
| 356 | |
| 357 | gpio_free_array(drvdata->gpios, drvdata->nr_gpios); |
| 358 | |
| 359 | kfree(drvdata->states); |
| 360 | kfree(drvdata->gpios); |
| 361 | |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 362 | kfree(drvdata->desc.name); |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 363 | |
| 364 | return 0; |
| 365 | } |
| 366 | |
Axel Lin | ec4f7b8 | 2012-12-04 10:32:05 +0800 | [diff] [blame] | 367 | #if defined(CONFIG_OF) |
Greg Kroah-Hartman | 3d68dfe | 2012-12-21 13:26:06 -0800 | [diff] [blame] | 368 | static const struct of_device_id regulator_gpio_of_match[] = { |
Lee Jones | 006694d | 2012-10-15 14:16:59 +0100 | [diff] [blame] | 369 | { .compatible = "regulator-gpio", }, |
| 370 | {}, |
| 371 | }; |
Axel Lin | ec4f7b8 | 2012-12-04 10:32:05 +0800 | [diff] [blame] | 372 | #endif |
Lee Jones | 006694d | 2012-10-15 14:16:59 +0100 | [diff] [blame] | 373 | |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 374 | static struct platform_driver gpio_regulator_driver = { |
| 375 | .probe = gpio_regulator_probe, |
Bill Pemberton | 5eb9f2b | 2012-11-19 13:20:42 -0500 | [diff] [blame] | 376 | .remove = gpio_regulator_remove, |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 377 | .driver = { |
| 378 | .name = "gpio-regulator", |
| 379 | .owner = THIS_MODULE, |
Axel Lin | ec4f7b8 | 2012-12-04 10:32:05 +0800 | [diff] [blame] | 380 | .of_match_table = of_match_ptr(regulator_gpio_of_match), |
Heiko Stübner | 3f0292a | 2011-10-05 12:27:05 +0200 | [diff] [blame] | 381 | }, |
| 382 | }; |
| 383 | |
| 384 | static int __init gpio_regulator_init(void) |
| 385 | { |
| 386 | return platform_driver_register(&gpio_regulator_driver); |
| 387 | } |
| 388 | subsys_initcall(gpio_regulator_init); |
| 389 | |
| 390 | static void __exit gpio_regulator_exit(void) |
| 391 | { |
| 392 | platform_driver_unregister(&gpio_regulator_driver); |
| 393 | } |
| 394 | module_exit(gpio_regulator_exit); |
| 395 | |
| 396 | MODULE_AUTHOR("Heiko Stuebner <heiko@sntech.de>"); |
| 397 | MODULE_DESCRIPTION("gpio voltage regulator"); |
| 398 | MODULE_LICENSE("GPL"); |
| 399 | MODULE_ALIAS("platform:gpio-regulator"); |