drivers/hwmon/gpio-fan.c

   1 /*
   2  * gpio-fan.c - Hwmon driver for fans connected to GPIO lines.
   3  *
   4  * Copyright (C) 2010 LaCie
   5  *
   6  * Author: Simon Guinot <sguinot@lacie.com>
   7  *
   8  * This program is free software; you can redistribute it and/or modify
   9  * it under the terms of the GNU General Public License as published by
  10  * the Free Software Foundation; either version 2 of the License, or
  11  * (at your option) any later version.
  12  *
  13  * This program is distributed in the hope that it will be useful,
  14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  * GNU General Public License for more details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program; if not, write to the Free Software
  20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  */
  22
  23 #include <linux/module.h>
  24 #include <linux/init.h>
  25 #include <linux/slab.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/irq.h>
  28 #include <linux/platform_device.h>
  29 #include <linux/err.h>
  30 #include <linux/mutex.h>
  31 #include <linux/hwmon.h>
  32 #include <linux/gpio.h>
  33 #include <linux/gpio-fan.h>
  34 #include <linux/of.h>
  35 #include <linux/of_platform.h>
  36 #include <linux/of_gpio.h>
  37 #include <linux/thermal.h>
  38
  39 struct gpio_fan_data {
  40         struct platform_device  *pdev;
  41         struct device           *hwmon_dev;
  42         /* Cooling device if any */
  43         struct thermal_cooling_device *cdev;
  44         struct mutex            lock; /* lock GPIOs operations. */
  45         int                     num_ctrl;
  46         unsigned                *ctrl;
  47         int                     num_speed;
  48         struct gpio_fan_speed   *speed;
  49         int                     speed_index;
  50 #ifdef CONFIG_PM_SLEEP
  51         int                     resume_speed;
  52 #endif
  53         bool                    pwm_enable;
  54         struct gpio_fan_alarm   *alarm;
  55         struct work_struct      alarm_work;
  56 };
  57
  58 /*
  59  * Alarm GPIO.
  60  */
  61
  62 static void fan_alarm_notify(struct work_struct *ws)
  63 {
  64         struct gpio_fan_data *fan_data =
  65                 container_of(ws, struct gpio_fan_data, alarm_work);
  66
  67         sysfs_notify(&fan_data->pdev->dev.kobj, NULL, "fan1_alarm");
  68         kobject_uevent(&fan_data->pdev->dev.kobj, KOBJ_CHANGE);
  69 }
  70
  71 static irqreturn_t fan_alarm_irq_handler(int irq, void *dev_id)
  72 {
  73         struct gpio_fan_data *fan_data = dev_id;
  74
  75         schedule_work(&fan_data->alarm_work);
  76
  77         return IRQ_NONE;
  78 }
  79
  80 static ssize_t show_fan_alarm(struct device *dev,
  81                               struct device_attribute *attr, char *buf)
  82 {
  83         struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
  84         struct gpio_fan_alarm *alarm = fan_data->alarm;
  85         int value = gpio_get_value_cansleep(alarm->gpio);
  86
  87         if (alarm->active_low)
  88                 value = !value;
  89
  90         return sprintf(buf, "%d\n", value);
  91 }
  92
  93 static DEVICE_ATTR(fan1_alarm, S_IRUGO, show_fan_alarm, NULL);
  94
  95 static int fan_alarm_init(struct gpio_fan_data *fan_data,
  96                           struct gpio_fan_alarm *alarm)
  97 {
  98         int err;
  99         int alarm_irq;
 100         struct platform_device *pdev = fan_data->pdev;
 101
 102         fan_data->alarm = alarm;
 103
 104         err = devm_gpio_request(&pdev->dev, alarm->gpio, "GPIO fan alarm");
 105         if (err)
 106                 return err;
 107
 108         err = gpio_direction_input(alarm->gpio);
 109         if (err)
 110                 return err;
 111
 112         /*
 113          * If the alarm GPIO don't support interrupts, just leave
 114          * without initializing the fail notification support.
 115          */
 116         alarm_irq = gpio_to_irq(alarm->gpio);
 117         if (alarm_irq < 0)
 118                 return 0;
 119
 120         INIT_WORK(&fan_data->alarm_work, fan_alarm_notify);
 121         irq_set_irq_type(alarm_irq, IRQ_TYPE_EDGE_BOTH);
 122         err = devm_request_irq(&pdev->dev, alarm_irq, fan_alarm_irq_handler,
 123                                IRQF_SHARED, "GPIO fan alarm", fan_data);
 124         return err;
 125 }
 126
 127 /*
 128  * Control GPIOs.
 129  */
 130
 131 /* Must be called with fan_data->lock held, except during initialization. */
 132 static void __set_fan_ctrl(struct gpio_fan_data *fan_data, int ctrl_val)
 133 {
 134         int i;
 135
 136         for (i = 0; i < fan_data->num_ctrl; i++)
 137                 gpio_set_value_cansleep(fan_data->ctrl[i], (ctrl_val >> i) & 1);
 138 }
 139
 140 static int __get_fan_ctrl(struct gpio_fan_data *fan_data)
 141 {
 142         int i;
 143         int ctrl_val = 0;
 144
 145         for (i = 0; i < fan_data->num_ctrl; i++) {
 146                 int value;
 147
 148                 value = gpio_get_value_cansleep(fan_data->ctrl[i]);
 149                 ctrl_val |= (value << i);
 150         }
 151         return ctrl_val;
 152 }
 153
 154 /* Must be called with fan_data->lock held, except during initialization. */
 155 static void set_fan_speed(struct gpio_fan_data *fan_data, int speed_index)
 156 {
 157         if (fan_data->speed_index == speed_index)
 158                 return;
 159
 160         __set_fan_ctrl(fan_data, fan_data->speed[speed_index].ctrl_val);
 161         fan_data->speed_index = speed_index;
 162 }
 163
 164 static int get_fan_speed_index(struct gpio_fan_data *fan_data)
 165 {
 166         int ctrl_val = __get_fan_ctrl(fan_data);
 167         int i;
 168
 169         for (i = 0; i < fan_data->num_speed; i++)
 170                 if (fan_data->speed[i].ctrl_val == ctrl_val)
 171                         return i;
 172
 173         dev_warn(&fan_data->pdev->dev,
 174                  "missing speed array entry for GPIO value 0x%x\n", ctrl_val);
 175
 176         return -ENODEV;
 177 }
 178
 179 static int rpm_to_speed_index(struct gpio_fan_data *fan_data, unsigned long rpm)
 180 {
 181         struct gpio_fan_speed *speed = fan_data->speed;
 182         int i;
 183
 184         for (i = 0; i < fan_data->num_speed; i++)
 185                 if (speed[i].rpm >= rpm)
 186                         return i;
 187
 188         return fan_data->num_speed - 1;
 189 }
 190
 191 static ssize_t show_pwm(struct device *dev,
 192                         struct device_attribute *attr, char *buf)
 193 {
 194         struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
 195         u8 pwm = fan_data->speed_index * 255 / (fan_data->num_speed - 1);
 196
 197         return sprintf(buf, "%d\n", pwm);
 198 }
 199
 200 static ssize_t set_pwm(struct device *dev, struct device_attribute *attr,
 201                        const char *buf, size_t count)
 202 {
 203         struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
 204         unsigned long pwm;
 205         int speed_index;
 206         int ret = count;
 207
 208         if (kstrtoul(buf, 10, &pwm) || pwm > 255)
 209                 return -EINVAL;
 210
 211         mutex_lock(&fan_data->lock);
 212
 213         if (!fan_data->pwm_enable) {
 214                 ret = -EPERM;
 215                 goto exit_unlock;
 216         }
 217
 218         speed_index = DIV_ROUND_UP(pwm * (fan_data->num_speed - 1), 255);
 219         set_fan_speed(fan_data, speed_index);
 220
 221 exit_unlock:
 222         mutex_unlock(&fan_data->lock);
 223
 224         return ret;
 225 }
 226
 227 static ssize_t show_pwm_enable(struct device *dev,
 228                                struct device_attribute *attr, char *buf)
 229 {
 230         struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
 231
 232         return sprintf(buf, "%d\n", fan_data->pwm_enable);
 233 }
 234
 235 static ssize_t set_pwm_enable(struct device *dev, struct device_attribute *attr,
 236                               const char *buf, size_t count)
 237 {
 238         struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
 239         unsigned long val;
 240
 241         if (kstrtoul(buf, 10, &val) || val > 1)
 242                 return -EINVAL;
 243
 244         if (fan_data->pwm_enable == val)
 245                 return count;
 246
 247         mutex_lock(&fan_data->lock);
 248
 249         fan_data->pwm_enable = val;
 250
 251         /* Disable manual control mode: set fan at full speed. */
 252         if (val == 0)
 253                 set_fan_speed(fan_data, fan_data->num_speed - 1);
 254
 255         mutex_unlock(&fan_data->lock);
 256
 257         return count;
 258 }
 259
 260 static ssize_t show_pwm_mode(struct device *dev,
 261                              struct device_attribute *attr, char *buf)
 262 {
 263         return sprintf(buf, "0\n");
 264 }
 265
 266 static ssize_t show_rpm_min(struct device *dev,
 267                             struct device_attribute *attr, char *buf)
 268 {
 269         struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
 270
 271         return sprintf(buf, "%d\n", fan_data->speed[0].rpm);
 272 }
 273
 274 static ssize_t show_rpm_max(struct device *dev,
 275                             struct device_attribute *attr, char *buf)
 276 {
 277         struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
 278
 279         return sprintf(buf, "%d\n",
 280                        fan_data->speed[fan_data->num_speed - 1].rpm);
 281 }
 282
 283 static ssize_t show_rpm(struct device *dev,
 284                         struct device_attribute *attr, char *buf)
 285 {
 286         struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
 287
 288         return sprintf(buf, "%d\n", fan_data->speed[fan_data->speed_index].rpm);
 289 }
 290
 291 static ssize_t set_rpm(struct device *dev, struct device_attribute *attr,
 292                        const char *buf, size_t count)
 293 {
 294         struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
 295         unsigned long rpm;
 296         int ret = count;
 297
 298         if (kstrtoul(buf, 10, &rpm))
 299                 return -EINVAL;
 300
 301         mutex_lock(&fan_data->lock);
 302
 303         if (!fan_data->pwm_enable) {
 304                 ret = -EPERM;
 305                 goto exit_unlock;
 306         }
 307
 308         set_fan_speed(fan_data, rpm_to_speed_index(fan_data, rpm));
 309
 310 exit_unlock:
 311         mutex_unlock(&fan_data->lock);
 312
 313         return ret;
 314 }
 315
 316 static DEVICE_ATTR(pwm1, S_IRUGO | S_IWUSR, show_pwm, set_pwm);
 317 static DEVICE_ATTR(pwm1_enable, S_IRUGO | S_IWUSR,
 318                    show_pwm_enable, set_pwm_enable);
 319 static DEVICE_ATTR(pwm1_mode, S_IRUGO, show_pwm_mode, NULL);
 320 static DEVICE_ATTR(fan1_min, S_IRUGO, show_rpm_min, NULL);
 321 static DEVICE_ATTR(fan1_max, S_IRUGO, show_rpm_max, NULL);
 322 static DEVICE_ATTR(fan1_input, S_IRUGO, show_rpm, NULL);
 323 static DEVICE_ATTR(fan1_target, S_IRUGO | S_IWUSR, show_rpm, set_rpm);
 324
 325 static umode_t gpio_fan_is_visible(struct kobject *kobj,
 326                                    struct attribute *attr, int index)
 327 {
 328         struct device *dev = container_of(kobj, struct device, kobj);
 329         struct gpio_fan_data *data = dev_get_drvdata(dev);
 330
 331         if (index == 0 && !data->alarm)
 332                 return 0;
 333         if (index > 0 && !data->ctrl)
 334                 return 0;
 335
 336         return attr->mode;
 337 }
 338
 339 static struct attribute *gpio_fan_attributes[] = {
 340         &dev_attr_fan1_alarm.attr,              /* 0 */
 341         &dev_attr_pwm1.attr,                    /* 1 */
 342         &dev_attr_pwm1_enable.attr,
 343         &dev_attr_pwm1_mode.attr,
 344         &dev_attr_fan1_input.attr,
 345         &dev_attr_fan1_target.attr,
 346         &dev_attr_fan1_min.attr,
 347         &dev_attr_fan1_max.attr,
 348         NULL
 349 };
 350
 351 static const struct attribute_group gpio_fan_group = {
 352         .attrs = gpio_fan_attributes,
 353         .is_visible = gpio_fan_is_visible,
 354 };
 355
 356 static const struct attribute_group *gpio_fan_groups[] = {
 357         &gpio_fan_group,
 358         NULL
 359 };
 360
 361 static int fan_ctrl_init(struct gpio_fan_data *fan_data,
 362                          struct gpio_fan_platform_data *pdata)
 363 {
 364         struct platform_device *pdev = fan_data->pdev;
 365         int num_ctrl = pdata->num_ctrl;
 366         unsigned *ctrl = pdata->ctrl;
 367         int i, err;
 368
 369         for (i = 0; i < num_ctrl; i++) {
 370                 err = devm_gpio_request(&pdev->dev, ctrl[i],
 371                                         "GPIO fan control");
 372                 if (err)
 373                         return err;
 374
 375                 err = gpio_direction_output(ctrl[i],
 376                                             gpio_get_value_cansleep(ctrl[i]));
 377                 if (err)
 378                         return err;
 379         }
 380
 381         fan_data->num_ctrl = num_ctrl;
 382         fan_data->ctrl = ctrl;
 383         fan_data->num_speed = pdata->num_speed;
 384         fan_data->speed = pdata->speed;
 385         fan_data->pwm_enable = true; /* Enable manual fan speed control. */
 386         fan_data->speed_index = get_fan_speed_index(fan_data);
 387         if (fan_data->speed_index < 0)
 388                 return fan_data->speed_index;
 389
 390         return 0;
 391 }
 392
 393 static int gpio_fan_get_max_state(struct thermal_cooling_device *cdev,
 394                                   unsigned long *state)
 395 {
 396         struct gpio_fan_data *fan_data = cdev->devdata;
 397
 398         if (!fan_data)
 399                 return -EINVAL;
 400
 401         *state = fan_data->num_speed - 1;
 402         return 0;
 403 }
 404
 405 static int gpio_fan_get_cur_state(struct thermal_cooling_device *cdev,
 406                                   unsigned long *state)
 407 {
 408         struct gpio_fan_data *fan_data = cdev->devdata;
 409         int r;
 410
 411         if (!fan_data)
 412                 return -EINVAL;
 413
 414         r = get_fan_speed_index(fan_data);
 415         if (r < 0)
 416                 return r;
 417
 418         *state = r;
 419         return 0;
 420 }
 421
 422 static int gpio_fan_set_cur_state(struct thermal_cooling_device *cdev,
 423                                   unsigned long state)
 424 {
 425         struct gpio_fan_data *fan_data = cdev->devdata;
 426
 427         if (!fan_data)
 428                 return -EINVAL;
 429
 430         set_fan_speed(fan_data, state);
 431         return 0;
 432 }
 433
 434 static const struct thermal_cooling_device_ops gpio_fan_cool_ops = {
 435         .get_max_state = gpio_fan_get_max_state,
 436         .get_cur_state = gpio_fan_get_cur_state,
 437         .set_cur_state = gpio_fan_set_cur_state,
 438 };
 439
 440 #ifdef CONFIG_OF_GPIO
 441 /*
 442  * Translate OpenFirmware node properties into platform_data
 443  */
 444 static int gpio_fan_get_of_pdata(struct device *dev,
 445                             struct gpio_fan_platform_data *pdata)
 446 {
 447         struct device_node *node;
 448         struct gpio_fan_speed *speed;
 449         unsigned *ctrl;
 450         unsigned i;
 451         u32 u;
 452         struct property *prop;
 453         const __be32 *p;
 454
 455         node = dev->of_node;
 456
 457         /* Alarm GPIO if one exists */
 458         if (of_gpio_named_count(node, "alarm-gpios") > 0) {
 459                 struct gpio_fan_alarm *alarm;
 460                 int val;
 461                 enum of_gpio_flags flags;
 462
 463                 alarm = devm_kzalloc(dev, sizeof(struct gpio_fan_alarm),
 464                                         GFP_KERNEL);
 465                 if (!alarm)
 466                         return -ENOMEM;
 467
 468                 val = of_get_named_gpio_flags(node, "alarm-gpios", 0, &flags);
 469                 if (val < 0)
 470                         return val;
 471                 alarm->gpio = val;
 472                 alarm->active_low = flags & OF_GPIO_ACTIVE_LOW;
 473
 474                 pdata->alarm = alarm;
 475         }
 476
 477         /* Fill GPIO pin array */
 478         pdata->num_ctrl = of_gpio_count(node);
 479         if (pdata->num_ctrl <= 0) {
 480                 if (pdata->alarm)
 481                         return 0;
 482                 dev_err(dev, "DT properties empty / missing");
 483                 return -ENODEV;
 484         }
 485         ctrl = devm_kzalloc(dev, pdata->num_ctrl * sizeof(unsigned),
 486                                 GFP_KERNEL);
 487         if (!ctrl)
 488                 return -ENOMEM;
 489         for (i = 0; i < pdata->num_ctrl; i++) {
 490                 int val;
 491
 492                 val = of_get_gpio(node, i);
 493                 if (val < 0)
 494                         return val;
 495                 ctrl[i] = val;
 496         }
 497         pdata->ctrl = ctrl;
 498
 499         /* Get number of RPM/ctrl_val pairs in speed map */
 500         prop = of_find_property(node, "gpio-fan,speed-map", &i);
 501         if (!prop) {
 502                 dev_err(dev, "gpio-fan,speed-map DT property missing");
 503                 return -ENODEV;
 504         }
 505         i = i / sizeof(u32);
 506         if (i == 0 || i & 1) {
 507                 dev_err(dev, "gpio-fan,speed-map contains zero/odd number of entries");
 508                 return -ENODEV;
 509         }
 510         pdata->num_speed = i / 2;
 511
 512         /*
 513          * Populate speed map
 514          * Speed map is in the form <RPM ctrl_val RPM ctrl_val ...>
 515          * this needs splitting into pairs to create gpio_fan_speed structs
 516          */
 517         speed = devm_kzalloc(dev,
 518                         pdata->num_speed * sizeof(struct gpio_fan_speed),
 519                         GFP_KERNEL);
 520         if (!speed)
 521                 return -ENOMEM;
 522         p = NULL;
 523         for (i = 0; i < pdata->num_speed; i++) {
 524                 p = of_prop_next_u32(prop, p, &u);
 525                 if (!p)
 526                         return -ENODEV;
 527                 speed[i].rpm = u;
 528                 p = of_prop_next_u32(prop, p, &u);
 529                 if (!p)
 530                         return -ENODEV;
 531                 speed[i].ctrl_val = u;
 532         }
 533         pdata->speed = speed;
 534
 535         return 0;
 536 }
 537
 538 static const struct of_device_id of_gpio_fan_match[] = {
 539         { .compatible = "gpio-fan", },
 540         {},
 541 };
 542 MODULE_DEVICE_TABLE(of, of_gpio_fan_match);
 543 #endif /* CONFIG_OF_GPIO */
 544
 545 static int gpio_fan_probe(struct platform_device *pdev)
 546 {
 547         int err;
 548         struct gpio_fan_data *fan_data;
 549         struct gpio_fan_platform_data *pdata = dev_get_platdata(&pdev->dev);
 550
 551         fan_data = devm_kzalloc(&pdev->dev, sizeof(struct gpio_fan_data),
 552                                 GFP_KERNEL);
 553         if (!fan_data)
 554                 return -ENOMEM;
 555
 556 #ifdef CONFIG_OF_GPIO
 557         if (!pdata) {
 558                 pdata = devm_kzalloc(&pdev->dev,
 559                                         sizeof(struct gpio_fan_platform_data),
 560                                         GFP_KERNEL);
 561                 if (!pdata)
 562                         return -ENOMEM;
 563
 564                 err = gpio_fan_get_of_pdata(&pdev->dev, pdata);
 565                 if (err)
 566                         return err;
 567         }
 568 #else /* CONFIG_OF_GPIO */
 569         if (!pdata)
 570                 return -EINVAL;
 571 #endif /* CONFIG_OF_GPIO */
 572
 573         fan_data->pdev = pdev;
 574         platform_set_drvdata(pdev, fan_data);
 575         mutex_init(&fan_data->lock);
 576
 577         /* Configure alarm GPIO if available. */
 578         if (pdata->alarm) {
 579                 err = fan_alarm_init(fan_data, pdata->alarm);
 580                 if (err)
 581                         return err;
 582         }
 583
 584         /* Configure control GPIOs if available. */
 585         if (pdata->ctrl && pdata->num_ctrl > 0) {
 586                 if (!pdata->speed || pdata->num_speed <= 1)
 587                         return -EINVAL;
 588                 err = fan_ctrl_init(fan_data, pdata);
 589                 if (err)
 590                         return err;
 591         }
 592
 593         /* Make this driver part of hwmon class. */
 594         fan_data->hwmon_dev =
 595                 devm_hwmon_device_register_with_groups(&pdev->dev,
 596                                                        "gpio_fan", fan_data,
 597                                                        gpio_fan_groups);
 598         if (IS_ERR(fan_data->hwmon_dev))
 599                 return PTR_ERR(fan_data->hwmon_dev);
 600 #ifdef CONFIG_OF_GPIO
 601         /* Optional cooling device register for Device tree platforms */
 602         fan_data->cdev = thermal_of_cooling_device_register(pdev->dev.of_node,
 603                                                             "gpio-fan",
 604                                                             fan_data,
 605                                                             &gpio_fan_cool_ops);
 606 #else /* CONFIG_OF_GPIO */
 607         /* Optional cooling device register for non Device tree platforms */
 608         fan_data->cdev = thermal_cooling_device_register("gpio-fan", fan_data,
 609                                                          &gpio_fan_cool_ops);
 610 #endif /* CONFIG_OF_GPIO */
 611
 612         dev_info(&pdev->dev, "GPIO fan initialized\n");
 613
 614         return 0;
 615 }
 616
 617 static int gpio_fan_remove(struct platform_device *pdev)
 618 {
 619         struct gpio_fan_data *fan_data = platform_get_drvdata(pdev);
 620
 621         if (!IS_ERR(fan_data->cdev))
 622                 thermal_cooling_device_unregister(fan_data->cdev);
 623
 624         if (fan_data->ctrl)
 625                 set_fan_speed(fan_data, 0);
 626
 627         return 0;
 628 }
 629
 630 static void gpio_fan_shutdown(struct platform_device *pdev)
 631 {
 632         gpio_fan_remove(pdev);
 633 }
 634
 635 #ifdef CONFIG_PM_SLEEP
 636 static int gpio_fan_suspend(struct device *dev)
 637 {
 638         struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
 639
 640         if (fan_data->ctrl) {
 641                 fan_data->resume_speed = fan_data->speed_index;
 642                 set_fan_speed(fan_data, 0);
 643         }
 644
 645         return 0;
 646 }
 647
 648 static int gpio_fan_resume(struct device *dev)
 649 {
 650         struct gpio_fan_data *fan_data = dev_get_drvdata(dev);
 651
 652         if (fan_data->ctrl)
 653                 set_fan_speed(fan_data, fan_data->resume_speed);
 654
 655         return 0;
 656 }
 657
 658 static SIMPLE_DEV_PM_OPS(gpio_fan_pm, gpio_fan_suspend, gpio_fan_resume);
 659 #define GPIO_FAN_PM     (&gpio_fan_pm)
 660 #else
 661 #define GPIO_FAN_PM     NULL
 662 #endif
 663
 664 static struct platform_driver gpio_fan_driver = {
 665         .probe          = gpio_fan_probe,
 666         .remove         = gpio_fan_remove,
 667         .shutdown       = gpio_fan_shutdown,
 668         .driver = {
 669                 .name   = "gpio-fan",
 670                 .pm     = GPIO_FAN_PM,
 671 #ifdef CONFIG_OF_GPIO
 672                 .of_match_table = of_match_ptr(of_gpio_fan_match),
 673 #endif
 674         },
 675 };
 676
 677 module_platform_driver(gpio_fan_driver);
 678
 679 MODULE_AUTHOR("Simon Guinot <sguinot@lacie.com>");
 680 MODULE_DESCRIPTION("GPIO FAN driver");
 681 MODULE_LICENSE("GPL");
 682 MODULE_ALIAS("platform:gpio-fan");