package/kernel/gpio-button-hotplug/src/gpio-button-hotplug.c

   1 /*
   2  *  GPIO Button Hotplug driver
   3  *
   4  *  Copyright (C) 2012 Felix Fietkau <nbd@nbd.name>
   5  *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
   6  *
   7  *  Based on the diag.c - GPIO interface driver for Broadcom boards
   8  *    Copyright (C) 2006 Mike Baker <mbm@openwrt.org>,
   9  *    Copyright (C) 2006-2007 Felix Fietkau <nbd@nbd.name>
  10  *    Copyright (C) 2008 Andy Boyett <agb@openwrt.org>
  11  *
  12  *  This program is free software; you can redistribute it and/or modify it
  13  *  under the terms of the GNU General Public License version 2 as published
  14  *  by the Free Software Foundation.
  15  */
  16
  17 #include <linux/module.h>
  18 #include <linux/version.h>
  19 #include <linux/kmod.h>
  20
  21 #include <linux/workqueue.h>
  22 #include <linux/skbuff.h>
  23 #include <linux/netlink.h>
  24 #include <linux/kobject.h>
  25 #include <linux/input.h>
  26 #include <linux/interrupt.h>
  27 #include <linux/platform_device.h>
  28 #include <linux/of_gpio.h>
  29 #include <linux/of_irq.h>
  30 #include <linux/gpio_keys.h>
  31
  32 #define DRV_NAME        "gpio-keys"
  33
  34 #define BH_SKB_SIZE     2048
  35
  36 #define PFX     DRV_NAME ": "
  37
  38 #undef BH_DEBUG
  39
  40 #ifdef BH_DEBUG
  41 #define BH_DBG(fmt, args...) printk(KERN_DEBUG "%s: " fmt, DRV_NAME, ##args )
  42 #else
  43 #define BH_DBG(fmt, args...) do {} while (0)
  44 #endif
  45
  46 #define BH_ERR(fmt, args...) printk(KERN_ERR "%s: " fmt, DRV_NAME, ##args )
  47
  48 struct bh_priv {
  49         unsigned long           seen;
  50 };
  51
  52 struct bh_event {
  53         const char              *name;
  54         unsigned int            type;
  55         char                    *action;
  56         unsigned long           seen;
  57
  58         struct sk_buff          *skb;
  59         struct work_struct      work;
  60 };
  61
  62 struct bh_map {
  63         unsigned int    code;
  64         const char      *name;
  65 };
  66
  67 struct gpio_keys_button_data {
  68         struct delayed_work work;
  69         struct bh_priv bh;
  70         int last_state;
  71         int count;
  72         int threshold;
  73         int can_sleep;
  74         int irq;
  75         unsigned int software_debounce;
  76         struct gpio_desc *gpiod;
  77         const struct gpio_keys_button *b;
  78 };
  79
  80 extern u64 uevent_next_seqnum(void);
  81
  82 #define BH_MAP(_code, _name)            \
  83         {                               \
  84                 .code = (_code),        \
  85                 .name = (_name),        \
  86         }
  87
  88 static struct bh_map button_map[] = {
  89         BH_MAP(BTN_0,                   "BTN_0"),
  90         BH_MAP(BTN_1,                   "BTN_1"),
  91         BH_MAP(BTN_2,                   "BTN_2"),
  92         BH_MAP(BTN_3,                   "BTN_3"),
  93         BH_MAP(BTN_4,                   "BTN_4"),
  94         BH_MAP(BTN_5,                   "BTN_5"),
  95         BH_MAP(BTN_6,                   "BTN_6"),
  96         BH_MAP(BTN_7,                   "BTN_7"),
  97         BH_MAP(BTN_8,                   "BTN_8"),
  98         BH_MAP(BTN_9,                   "BTN_9"),
  99         BH_MAP(KEY_BRIGHTNESS_ZERO,     "brightness_zero"),
 100         BH_MAP(KEY_CONFIG,              "config"),
 101         BH_MAP(KEY_COPY,                "copy"),
 102         BH_MAP(KEY_EJECTCD,             "eject"),
 103         BH_MAP(KEY_HELP,                "help"),
 104         BH_MAP(KEY_LIGHTS_TOGGLE,       "lights_toggle"),
 105         BH_MAP(KEY_PHONE,               "phone"),
 106         BH_MAP(KEY_POWER,               "power"),
 107         BH_MAP(KEY_POWER2,              "reboot"),
 108         BH_MAP(KEY_RESTART,             "reset"),
 109         BH_MAP(KEY_RFKILL,              "rfkill"),
 110         BH_MAP(KEY_VIDEO,               "video"),
 111         BH_MAP(KEY_WIMAX,               "wwan"),
 112         BH_MAP(KEY_WLAN,                "wlan"),
 113         BH_MAP(KEY_WPS_BUTTON,          "wps"),
 114 };
 115
 116 /* -------------------------------------------------------------------------*/
 117
 118 static __printf(3, 4)
 119 int bh_event_add_var(struct bh_event *event, int argv, const char *format, ...)
 120 {
 121         static char buf[128];
 122         char *s;
 123         va_list args;
 124         int len;
 125
 126         if (argv)
 127                 return 0;
 128
 129         va_start(args, format);
 130         len = vsnprintf(buf, sizeof(buf), format, args);
 131         va_end(args);
 132
 133         if (len >= sizeof(buf)) {
 134                 WARN(1, "buffer size too small");
 135                 return -ENOMEM;
 136         }
 137
 138         s = skb_put(event->skb, len + 1);
 139         strcpy(s, buf);
 140
 141         BH_DBG("added variable '%s'\n", s);
 142
 143         return 0;
 144 }
 145
 146 static int button_hotplug_fill_event(struct bh_event *event)
 147 {
 148         int ret;
 149
 150         ret = bh_event_add_var(event, 0, "HOME=%s", "/");
 151         if (ret)
 152                 return ret;
 153
 154         ret = bh_event_add_var(event, 0, "PATH=%s",
 155                                         "/sbin:/bin:/usr/sbin:/usr/bin");
 156         if (ret)
 157                 return ret;
 158
 159         ret = bh_event_add_var(event, 0, "SUBSYSTEM=%s", "button");
 160         if (ret)
 161                 return ret;
 162
 163         ret = bh_event_add_var(event, 0, "ACTION=%s", event->action);
 164         if (ret)
 165                 return ret;
 166
 167         ret = bh_event_add_var(event, 0, "BUTTON=%s", event->name);
 168         if (ret)
 169                 return ret;
 170
 171         if (event->type == EV_SW) {
 172                 ret = bh_event_add_var(event, 0, "TYPE=%s", "switch");
 173                 if (ret)
 174                         return ret;
 175         }
 176
 177         ret = bh_event_add_var(event, 0, "SEEN=%ld", event->seen);
 178         if (ret)
 179                 return ret;
 180
 181         ret = bh_event_add_var(event, 0, "SEQNUM=%llu", uevent_next_seqnum());
 182
 183         return ret;
 184 }
 185
 186 static void button_hotplug_work(struct work_struct *work)
 187 {
 188         struct bh_event *event = container_of(work, struct bh_event, work);
 189         int ret = 0;
 190
 191         event->skb = alloc_skb(BH_SKB_SIZE, GFP_KERNEL);
 192         if (!event->skb)
 193                 goto out_free_event;
 194
 195         ret = bh_event_add_var(event, 0, "%s@", event->action);
 196         if (ret)
 197                 goto out_free_skb;
 198
 199         ret = button_hotplug_fill_event(event);
 200         if (ret)
 201                 goto out_free_skb;
 202
 203         NETLINK_CB(event->skb).dst_group = 1;
 204         broadcast_uevent(event->skb, 0, 1, GFP_KERNEL);
 205
 206  out_free_skb:
 207         if (ret) {
 208                 BH_ERR("work error %d\n", ret);
 209                 kfree_skb(event->skb);
 210         }
 211  out_free_event:
 212         kfree(event);
 213 }
 214
 215 static int button_hotplug_create_event(const char *name, unsigned int type,
 216                 unsigned long seen, int pressed)
 217 {
 218         struct bh_event *event;
 219
 220         BH_DBG("create event, name=%s, seen=%lu, pressed=%d\n",
 221                 name, seen, pressed);
 222
 223         event = kzalloc(sizeof(*event), GFP_KERNEL);
 224         if (!event)
 225                 return -ENOMEM;
 226
 227         event->name = name;
 228         event->type = type;
 229         event->seen = seen;
 230         event->action = pressed ? "pressed" : "released";
 231
 232         INIT_WORK(&event->work, (void *)(void *)button_hotplug_work);
 233         schedule_work(&event->work);
 234
 235         return 0;
 236 }
 237
 238 /* -------------------------------------------------------------------------*/
 239
 240 static int button_get_index(unsigned int code)
 241 {
 242         int i;
 243
 244         for (i = 0; i < ARRAY_SIZE(button_map); i++)
 245                 if (button_map[i].code == code)
 246                         return i;
 247
 248         return -1;
 249 }
 250
 251 static void button_hotplug_event(struct gpio_keys_button_data *data,
 252                            unsigned int type, int value)
 253 {
 254         struct bh_priv *priv = &data->bh;
 255         unsigned long seen = jiffies;
 256         int btn;
 257
 258         BH_DBG("event type=%u, code=%u, value=%d\n", type, data->b->code, value);
 259
 260         if ((type != EV_KEY) && (type != EV_SW))
 261                 return;
 262
 263         btn = button_get_index(data->b->code);
 264         if (btn < 0)
 265                 return;
 266
 267         button_hotplug_create_event(button_map[btn].name, type,
 268                         (seen - priv->seen) / HZ, value);
 269         priv->seen = seen;
 270 }
 271
 272 struct gpio_keys_button_dev {
 273         int polled;
 274         struct delayed_work work;
 275
 276         struct device *dev;
 277         struct gpio_keys_platform_data *pdata;
 278         struct gpio_keys_button_data data[0];
 279 };
 280
 281 static int gpio_button_get_value(struct gpio_keys_button_data *bdata)
 282 {
 283         int val;
 284
 285         if (bdata->can_sleep)
 286                 val = !!gpio_get_value_cansleep(bdata->b->gpio);
 287         else
 288                 val = !!gpio_get_value(bdata->b->gpio);
 289
 290         return val ^ bdata->b->active_low;
 291 }
 292
 293 static void gpio_keys_polled_check_state(struct gpio_keys_button_data *bdata)
 294 {
 295         int state = gpio_button_get_value(bdata);
 296
 297         if (state != bdata->last_state) {
 298                 unsigned int type = bdata->b->type ?: EV_KEY;
 299
 300                 if (bdata->count < bdata->threshold) {
 301                         bdata->count++;
 302                         return;
 303                 }
 304
 305                 if (bdata->last_state != -1 || type == EV_SW)
 306                         button_hotplug_event(bdata, type, state);
 307
 308                 bdata->last_state = state;
 309         }
 310
 311         bdata->count = 0;
 312 }
 313
 314 static void gpio_keys_polled_queue_work(struct gpio_keys_button_dev *bdev)
 315 {
 316         struct gpio_keys_platform_data *pdata = bdev->pdata;
 317         unsigned long delay = msecs_to_jiffies(pdata->poll_interval);
 318
 319         if (delay >= HZ)
 320                 delay = round_jiffies_relative(delay);
 321         schedule_delayed_work(&bdev->work, delay);
 322 }
 323
 324 static void gpio_keys_polled_poll(struct work_struct *work)
 325 {
 326         struct gpio_keys_button_dev *bdev =
 327                 container_of(work, struct gpio_keys_button_dev, work.work);
 328         int i;
 329
 330         for (i = 0; i < bdev->pdata->nbuttons; i++) {
 331                 struct gpio_keys_button_data *bdata = &bdev->data[i];
 332                 gpio_keys_polled_check_state(bdata);
 333         }
 334         gpio_keys_polled_queue_work(bdev);
 335 }
 336
 337 static void gpio_keys_polled_close(struct gpio_keys_button_dev *bdev)
 338 {
 339         struct gpio_keys_platform_data *pdata = bdev->pdata;
 340
 341         cancel_delayed_work_sync(&bdev->work);
 342
 343         if (pdata->disable)
 344                 pdata->disable(bdev->dev);
 345 }
 346
 347 static void gpio_keys_irq_work_func(struct work_struct *work)
 348 {
 349         struct gpio_keys_button_data *bdata = container_of(work,
 350                 struct gpio_keys_button_data, work.work);
 351         int state = gpio_button_get_value(bdata);
 352
 353         if (state != bdata->last_state) {
 354                 unsigned int type = bdata->b->type ?: EV_KEY;
 355
 356                 if (bdata->last_state != -1 || type == EV_SW)
 357                         button_hotplug_event(bdata, type, state);
 358
 359                 bdata->last_state = state;
 360         }
 361 }
 362
 363 static irqreturn_t button_handle_irq(int irq, void *_bdata)
 364 {
 365         struct gpio_keys_button_data *bdata =
 366                 (struct gpio_keys_button_data *) _bdata;
 367
 368         schedule_delayed_work(&bdata->work,
 369                               msecs_to_jiffies(bdata->software_debounce));
 370
 371         return IRQ_HANDLED;
 372 }
 373
 374 #ifdef CONFIG_OF
 375 static struct gpio_keys_platform_data *
 376 gpio_keys_get_devtree_pdata(struct device *dev)
 377 {
 378         struct device_node *node, *pp;
 379         struct gpio_keys_platform_data *pdata;
 380         struct gpio_keys_button *button;
 381         int error;
 382         int nbuttons;
 383         int i = 0;
 384
 385         node = dev->of_node;
 386         if (!node)
 387                 return NULL;
 388
 389         nbuttons = of_get_child_count(node);
 390         if (nbuttons == 0)
 391                 return NULL;
 392
 393         pdata = devm_kzalloc(dev, sizeof(*pdata) + nbuttons * (sizeof *button),
 394                 GFP_KERNEL);
 395         if (!pdata) {
 396                 error = -ENOMEM;
 397                 goto err_out;
 398         }
 399
 400         pdata->buttons = (struct gpio_keys_button *)(pdata + 1);
 401         pdata->nbuttons = nbuttons;
 402
 403         pdata->rep = !!of_get_property(node, "autorepeat", NULL);
 404         of_property_read_u32(node, "poll-interval", &pdata->poll_interval);
 405
 406         for_each_child_of_node(node, pp) {
 407                 enum of_gpio_flags flags;
 408
 409                 if (!of_find_property(pp, "gpios", NULL)) {
 410                         pdata->nbuttons--;
 411                         dev_warn(dev, "Found button without gpios\n");
 412                         continue;
 413                 }
 414
 415                 button = (struct gpio_keys_button *)(&pdata->buttons[i++]);
 416
 417                 button->irq = irq_of_parse_and_map(pp, 0);
 418
 419                 button->gpio = of_get_gpio_flags(pp, 0, &flags);
 420                 if (button->gpio < 0) {
 421                         error = button->gpio;
 422                         if (error != -ENOENT) {
 423                                 if (error != -EPROBE_DEFER)
 424                                         dev_err(dev,
 425                                                 "Failed to get gpio flags, error: %d\n",
 426                                                 error);
 427                                 return ERR_PTR(error);
 428                         }
 429                 } else {
 430                         button->active_low = flags & OF_GPIO_ACTIVE_LOW;
 431                 }
 432
 433                 if (of_property_read_u32(pp, "linux,code", &button->code)) {
 434                         dev_err(dev, "Button without keycode: 0x%x\n",
 435                                 button->gpio);
 436                         error = -EINVAL;
 437                         goto err_out;
 438                 }
 439
 440                 button->desc = of_get_property(pp, "label", NULL);
 441
 442                 if (of_property_read_u32(pp, "linux,input-type", &button->type))
 443                         button->type = EV_KEY;
 444
 445                 button->wakeup = !!of_get_property(pp, "gpio-key,wakeup", NULL);
 446
 447                 if (of_property_read_u32(pp, "debounce-interval",
 448                                         &button->debounce_interval))
 449                         button->debounce_interval = 5;
 450         }
 451
 452         if (pdata->nbuttons == 0) {
 453                 error = -EINVAL;
 454                 goto err_out;
 455         }
 456
 457         return pdata;
 458
 459 err_out:
 460         return ERR_PTR(error);
 461 }
 462
 463 static struct of_device_id gpio_keys_of_match[] = {
 464         { .compatible = "gpio-keys", },
 465         { },
 466 };
 467 MODULE_DEVICE_TABLE(of, gpio_keys_of_match);
 468
 469 static struct of_device_id gpio_keys_polled_of_match[] = {
 470         { .compatible = "gpio-keys-polled", },
 471         { },
 472 };
 473 MODULE_DEVICE_TABLE(of, gpio_keys_polled_of_match);
 474
 475 #else
 476
 477 static inline struct gpio_keys_platform_data *
 478 gpio_keys_get_devtree_pdata(struct device *dev)
 479 {
 480         return NULL;
 481 }
 482 #endif
 483
 484 static int gpio_keys_button_probe(struct platform_device *pdev,
 485                 struct gpio_keys_button_dev **_bdev, int polled)
 486 {
 487         struct gpio_keys_platform_data *pdata = pdev->dev.platform_data;
 488         struct device *dev = &pdev->dev;
 489         struct gpio_keys_button_dev *bdev;
 490         struct gpio_keys_button *buttons;
 491         int error;
 492         int i;
 493
 494         if (!pdata) {
 495                 pdata = gpio_keys_get_devtree_pdata(dev);
 496                 if (IS_ERR(pdata))
 497                         return PTR_ERR(pdata);
 498                 if (!pdata) {
 499                         dev_err(dev, "missing platform data\n");
 500                         return -EINVAL;
 501                 }
 502         }
 503
 504         if (polled && !pdata->poll_interval) {
 505                 dev_err(dev, "missing poll_interval value\n");
 506                 return -EINVAL;
 507         }
 508
 509         buttons = devm_kzalloc(dev, pdata->nbuttons * sizeof(struct gpio_keys_button),
 510                        GFP_KERNEL);
 511         if (!buttons) {
 512                 dev_err(dev, "no memory for button data\n");
 513                 return -ENOMEM;
 514         }
 515         memcpy(buttons, pdata->buttons, pdata->nbuttons * sizeof(struct gpio_keys_button));
 516
 517         bdev = devm_kzalloc(dev, sizeof(struct gpio_keys_button_dev) +
 518                        pdata->nbuttons * sizeof(struct gpio_keys_button_data),
 519                        GFP_KERNEL);
 520         if (!bdev) {
 521                 dev_err(dev, "no memory for private data\n");
 522                 return -ENOMEM;
 523         }
 524
 525         bdev->polled = polled;
 526
 527         for (i = 0; i < pdata->nbuttons; i++) {
 528                 struct gpio_keys_button *button = &buttons[i];
 529                 struct gpio_keys_button_data *bdata = &bdev->data[i];
 530                 unsigned int gpio = button->gpio;
 531
 532                 if (button->wakeup) {
 533                         dev_err(dev, DRV_NAME "does not support wakeup\n");
 534                         return -EINVAL;
 535                 }
 536
 537                 error = devm_gpio_request(dev, gpio,
 538                                      button->desc ? button->desc : DRV_NAME);
 539                 if (error) {
 540                         dev_err(dev, "unable to claim gpio %u, err=%d\n",
 541                                 gpio, error);
 542                         return error;
 543                 }
 544                 bdata->gpiod = gpio_to_desc(gpio);
 545                 if (!bdata->gpiod)
 546                         return -EINVAL;
 547
 548                 error = gpio_direction_input(gpio);
 549                 if (error) {
 550                         dev_err(dev,
 551                                 "unable to set direction on gpio %u, err=%d\n",
 552                                 gpio, error);
 553                         return error;
 554                 }
 555
 556                 bdata->can_sleep = gpio_cansleep(gpio);
 557                 bdata->last_state = -1;
 558
 559                 if (bdev->polled) {
 560                         bdata->threshold = DIV_ROUND_UP(button->debounce_interval,
 561                                                         pdata->poll_interval);
 562                 } else {
 563                         bdata->threshold = 1;
 564
 565                         if (button->debounce_interval) {
 566                                 error = gpiod_set_debounce(bdata->gpiod,
 567                                         button->debounce_interval * 1000);
 568                                 /*
 569                                  * use timer if gpiolib doesn't provide
 570                                  * debounce.
 571                                  */
 572                                 if (error < 0) {
 573                                         bdata->software_debounce =
 574                                                 button->debounce_interval;
 575                                 }
 576                         }
 577                 }
 578
 579                 bdata->b = &pdata->buttons[i];
 580         }
 581
 582         bdev->dev = &pdev->dev;
 583         bdev->pdata = pdata;
 584         platform_set_drvdata(pdev, bdev);
 585
 586         *_bdev = bdev;
 587
 588         return 0;
 589 }
 590
 591 static int gpio_keys_probe(struct platform_device *pdev)
 592 {
 593         struct gpio_keys_platform_data *pdata;
 594         struct gpio_keys_button_dev *bdev;
 595         int ret, i;
 596
 597
 598         ret = gpio_keys_button_probe(pdev, &bdev, 0);
 599
 600         if (ret)
 601                 return ret;
 602
 603         pdata = bdev->pdata;
 604         for (i = 0; i < pdata->nbuttons; i++) {
 605                 const struct gpio_keys_button *button = &pdata->buttons[i];
 606                 struct gpio_keys_button_data *bdata = &bdev->data[i];
 607                 unsigned long irqflags = IRQF_ONESHOT;
 608
 609                 if (!button->irq) {
 610                         bdata->irq = gpio_to_irq(button->gpio);
 611
 612                         if (bdata->irq < 0) {
 613                                 dev_err(&pdev->dev, "failed to get irq for gpio:%d\n",
 614                                         button->gpio);
 615                                 continue;
 616                         }
 617
 618                         irqflags |= IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING;
 619                 } else {
 620                         bdata->irq = button->irq;
 621                 }
 622
 623                 INIT_DELAYED_WORK(&bdata->work, gpio_keys_irq_work_func);
 624
 625                 ret = devm_request_threaded_irq(&pdev->dev,
 626                         bdata->irq, NULL, button_handle_irq,
 627                         irqflags, dev_name(&pdev->dev), bdata);
 628
 629                 if (ret < 0) {
 630                         bdata->irq = 0;
 631                         dev_err(&pdev->dev, "failed to request irq:%d for gpio:%d\n",
 632                                 bdata->irq, button->gpio);
 633                         continue;
 634                 } else {
 635                         dev_dbg(&pdev->dev, "gpio:%d has irq:%d\n",
 636                                 button->gpio, bdata->irq);
 637                 }
 638
 639                 if (bdata->b->type == EV_SW)
 640                         button_hotplug_event(bdata, EV_SW, gpio_button_get_value(bdata));
 641         }
 642
 643         return 0;
 644 }
 645
 646 static int gpio_keys_polled_probe(struct platform_device *pdev)
 647 {
 648         struct gpio_keys_platform_data *pdata;
 649         struct gpio_keys_button_dev *bdev;
 650         int ret;
 651         int i;
 652
 653         ret = gpio_keys_button_probe(pdev, &bdev, 1);
 654
 655         if (ret)
 656                 return ret;
 657
 658         INIT_DELAYED_WORK(&bdev->work, gpio_keys_polled_poll);
 659
 660         pdata = bdev->pdata;
 661
 662         if (pdata->enable)
 663                 pdata->enable(bdev->dev);
 664
 665         for (i = 0; i < pdata->nbuttons; i++)
 666                 gpio_keys_polled_check_state(&bdev->data[i]);
 667
 668         gpio_keys_polled_queue_work(bdev);
 669
 670         return ret;
 671 }
 672
 673 static void gpio_keys_irq_close(struct gpio_keys_button_dev *bdev)
 674 {
 675         struct gpio_keys_platform_data *pdata = bdev->pdata;
 676         size_t i;
 677
 678         for (i = 0; i < pdata->nbuttons; i++) {
 679                 struct gpio_keys_button_data *bdata = &bdev->data[i];
 680
 681                 disable_irq(bdata->irq);
 682                 cancel_delayed_work_sync(&bdata->work);
 683         }
 684 }
 685
 686 static int gpio_keys_remove(struct platform_device *pdev)
 687 {
 688         struct gpio_keys_button_dev *bdev = platform_get_drvdata(pdev);
 689
 690         platform_set_drvdata(pdev, NULL);
 691
 692         if (bdev->polled)
 693                 gpio_keys_polled_close(bdev);
 694         else
 695                 gpio_keys_irq_close(bdev);
 696
 697         return 0;
 698 }
 699
 700 static struct platform_driver gpio_keys_driver = {
 701         .probe  = gpio_keys_probe,
 702         .remove = gpio_keys_remove,
 703         .driver = {
 704                 .name   = "gpio-keys",
 705                 .owner  = THIS_MODULE,
 706                 .of_match_table = of_match_ptr(gpio_keys_of_match),
 707         },
 708 };
 709
 710 static struct platform_driver gpio_keys_polled_driver = {
 711         .probe  = gpio_keys_polled_probe,
 712         .remove = gpio_keys_remove,
 713         .driver = {
 714                 .name   = "gpio-keys-polled",
 715                 .owner  = THIS_MODULE,
 716                 .of_match_table = of_match_ptr(gpio_keys_polled_of_match),
 717         },
 718 };
 719
 720 static int __init gpio_button_init(void)
 721 {
 722         int ret;
 723
 724         ret = platform_driver_register(&gpio_keys_driver);
 725         if (ret)
 726                 return ret;
 727
 728         ret = platform_driver_register(&gpio_keys_polled_driver);
 729         if (ret)
 730                 platform_driver_unregister(&gpio_keys_driver);
 731
 732         return ret;
 733 }
 734
 735 static void __exit gpio_button_exit(void)
 736 {
 737         platform_driver_unregister(&gpio_keys_driver);
 738         platform_driver_unregister(&gpio_keys_polled_driver);
 739 }
 740
 741 module_init(gpio_button_init);
 742 module_exit(gpio_button_exit);
 743
 744 MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
 745 MODULE_AUTHOR("Felix Fietkau <nbd@nbd.name>");
 746 MODULE_DESCRIPTION("Polled GPIO Buttons hotplug driver");
 747 MODULE_LICENSE("GPL v2");
 748 MODULE_ALIAS("platform:" DRV_NAME);