drivers/input/keyboard/samsung-keypad.c

   1 /*
   2  * Samsung keypad driver
   3  *
   4  * Copyright (C) 2010 Samsung Electronics Co.Ltd
   5  * Author: Joonyoung Shim <jy0922.shim@samsung.com>
   6  * Author: Donghwa Lee <dh09.lee@samsung.com>
   7  *
   8  * This program is free software; you can redistribute  it and/or modify it
   9  * under  the terms of  the GNU General  Public License as published by the
  10  * Free Software Foundation;  either version 2 of the  License, or (at your
  11  * option) any later version.
  12  */
  13
  14 #include <linux/clk.h>
  15 #include <linux/delay.h>
  16 #include <linux/err.h>
  17 #include <linux/init.h>
  18 #include <linux/input.h>
  19 #include <linux/interrupt.h>
  20 #include <linux/io.h>
  21 #include <linux/module.h>
  22 #include <linux/platform_device.h>
  23 #include <linux/slab.h>
  24 #include <linux/of.h>
  25 #include <linux/of_gpio.h>
  26 #include <linux/sched.h>
  27 #include <plat/keypad.h>
  28
  29 #define SAMSUNG_KEYIFCON                        0x00
  30 #define SAMSUNG_KEYIFSTSCLR                     0x04
  31 #define SAMSUNG_KEYIFCOL                        0x08
  32 #define SAMSUNG_KEYIFROW                        0x0c
  33 #define SAMSUNG_KEYIFFC                         0x10
  34
  35 /* SAMSUNG_KEYIFCON */
  36 #define SAMSUNG_KEYIFCON_INT_F_EN               (1 << 0)
  37 #define SAMSUNG_KEYIFCON_INT_R_EN               (1 << 1)
  38 #define SAMSUNG_KEYIFCON_DF_EN                  (1 << 2)
  39 #define SAMSUNG_KEYIFCON_FC_EN                  (1 << 3)
  40 #define SAMSUNG_KEYIFCON_WAKEUPEN               (1 << 4)
  41
  42 /* SAMSUNG_KEYIFSTSCLR */
  43 #define SAMSUNG_KEYIFSTSCLR_P_INT_MASK          (0xff << 0)
  44 #define SAMSUNG_KEYIFSTSCLR_R_INT_MASK          (0xff << 8)
  45 #define SAMSUNG_KEYIFSTSCLR_R_INT_OFFSET        8
  46 #define S5PV210_KEYIFSTSCLR_P_INT_MASK          (0x3fff << 0)
  47 #define S5PV210_KEYIFSTSCLR_R_INT_MASK          (0x3fff << 16)
  48 #define S5PV210_KEYIFSTSCLR_R_INT_OFFSET        16
  49
  50 /* SAMSUNG_KEYIFCOL */
  51 #define SAMSUNG_KEYIFCOL_MASK                   (0xff << 0)
  52 #define S5PV210_KEYIFCOLEN_MASK                 (0xff << 8)
  53
  54 /* SAMSUNG_KEYIFROW */
  55 #define SAMSUNG_KEYIFROW_MASK                   (0xff << 0)
  56 #define S5PV210_KEYIFROW_MASK                   (0x3fff << 0)
  57
  58 /* SAMSUNG_KEYIFFC */
  59 #define SAMSUNG_KEYIFFC_MASK                    (0x3ff << 0)
  60
  61 enum samsung_keypad_type {
  62         KEYPAD_TYPE_SAMSUNG,
  63         KEYPAD_TYPE_S5PV210,
  64 };
  65
  66 struct samsung_keypad {
  67         struct input_dev *input_dev;
  68         struct clk *clk;
  69         void __iomem *base;
  70         wait_queue_head_t wait;
  71         bool stopped;
  72         int irq;
  73         enum samsung_keypad_type type;
  74         unsigned int row_shift;
  75         unsigned int rows;
  76         unsigned int cols;
  77         unsigned int row_state[SAMSUNG_MAX_COLS];
  78 #ifdef CONFIG_OF
  79         int row_gpios[SAMSUNG_MAX_ROWS];
  80         int col_gpios[SAMSUNG_MAX_COLS];
  81 #endif
  82         unsigned short keycodes[];
  83 };
  84
  85 static void samsung_keypad_scan(struct samsung_keypad *keypad,
  86                                 unsigned int *row_state)
  87 {
  88         unsigned int col;
  89         unsigned int val;
  90
  91         for (col = 0; col < keypad->cols; col++) {
  92                 if (keypad->type == KEYPAD_TYPE_S5PV210) {
  93                         val = S5PV210_KEYIFCOLEN_MASK;
  94                         val &= ~(1 << col) << 8;
  95                 } else {
  96                         val = SAMSUNG_KEYIFCOL_MASK;
  97                         val &= ~(1 << col);
  98                 }
  99
 100                 writel(val, keypad->base + SAMSUNG_KEYIFCOL);
 101                 mdelay(1);
 102
 103                 val = readl(keypad->base + SAMSUNG_KEYIFROW);
 104                 row_state[col] = ~val & ((1 << keypad->rows) - 1);
 105         }
 106
 107         /* KEYIFCOL reg clear */
 108         writel(0, keypad->base + SAMSUNG_KEYIFCOL);
 109 }
 110
 111 static bool samsung_keypad_report(struct samsung_keypad *keypad,
 112                                   unsigned int *row_state)
 113 {
 114         struct input_dev *input_dev = keypad->input_dev;
 115         unsigned int changed;
 116         unsigned int pressed;
 117         unsigned int key_down = 0;
 118         unsigned int val;
 119         unsigned int col, row;
 120
 121         for (col = 0; col < keypad->cols; col++) {
 122                 changed = row_state[col] ^ keypad->row_state[col];
 123                 key_down |= row_state[col];
 124                 if (!changed)
 125                         continue;
 126
 127                 for (row = 0; row < keypad->rows; row++) {
 128                         if (!(changed & (1 << row)))
 129                                 continue;
 130
 131                         pressed = row_state[col] & (1 << row);
 132
 133                         dev_dbg(&keypad->input_dev->dev,
 134                                 "key %s, row: %d, col: %d\n",
 135                                 pressed ? "pressed" : "released", row, col);
 136
 137                         val = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
 138
 139                         input_event(input_dev, EV_MSC, MSC_SCAN, val);
 140                         input_report_key(input_dev,
 141                                         keypad->keycodes[val], pressed);
 142                 }
 143                 input_sync(keypad->input_dev);
 144         }
 145
 146         memcpy(keypad->row_state, row_state, sizeof(keypad->row_state));
 147
 148         return key_down;
 149 }
 150
 151 static irqreturn_t samsung_keypad_irq(int irq, void *dev_id)
 152 {
 153         struct samsung_keypad *keypad = dev_id;
 154         unsigned int row_state[SAMSUNG_MAX_COLS];
 155         unsigned int val;
 156         bool key_down;
 157
 158         do {
 159                 val = readl(keypad->base + SAMSUNG_KEYIFSTSCLR);
 160                 /* Clear interrupt. */
 161                 writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
 162
 163                 samsung_keypad_scan(keypad, row_state);
 164
 165                 key_down = samsung_keypad_report(keypad, row_state);
 166                 if (key_down)
 167                         wait_event_timeout(keypad->wait, keypad->stopped,
 168                                            msecs_to_jiffies(50));
 169
 170         } while (key_down && !keypad->stopped);
 171
 172         return IRQ_HANDLED;
 173 }
 174
 175 static void samsung_keypad_start(struct samsung_keypad *keypad)
 176 {
 177         unsigned int val;
 178
 179         /* Tell IRQ thread that it may poll the device. */
 180         keypad->stopped = false;
 181
 182         clk_enable(keypad->clk);
 183
 184         /* Enable interrupt bits. */
 185         val = readl(keypad->base + SAMSUNG_KEYIFCON);
 186         val |= SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN;
 187         writel(val, keypad->base + SAMSUNG_KEYIFCON);
 188
 189         /* KEYIFCOL reg clear. */
 190         writel(0, keypad->base + SAMSUNG_KEYIFCOL);
 191 }
 192
 193 static void samsung_keypad_stop(struct samsung_keypad *keypad)
 194 {
 195         unsigned int val;
 196
 197         /* Signal IRQ thread to stop polling and disable the handler. */
 198         keypad->stopped = true;
 199         wake_up(&keypad->wait);
 200         disable_irq(keypad->irq);
 201
 202         /* Clear interrupt. */
 203         writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
 204
 205         /* Disable interrupt bits. */
 206         val = readl(keypad->base + SAMSUNG_KEYIFCON);
 207         val &= ~(SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN);
 208         writel(val, keypad->base + SAMSUNG_KEYIFCON);
 209
 210         clk_disable(keypad->clk);
 211
 212         /*
 213          * Now that chip should not generate interrupts we can safely
 214          * re-enable the handler.
 215          */
 216         enable_irq(keypad->irq);
 217 }
 218
 219 static int samsung_keypad_open(struct input_dev *input_dev)
 220 {
 221         struct samsung_keypad *keypad = input_get_drvdata(input_dev);
 222
 223         samsung_keypad_start(keypad);
 224
 225         return 0;
 226 }
 227
 228 static void samsung_keypad_close(struct input_dev *input_dev)
 229 {
 230         struct samsung_keypad *keypad = input_get_drvdata(input_dev);
 231
 232         samsung_keypad_stop(keypad);
 233 }
 234
 235 #ifdef CONFIG_OF
 236 static struct samsung_keypad_platdata *samsung_keypad_parse_dt(
 237                                 struct device *dev)
 238 {
 239         struct samsung_keypad_platdata *pdata;
 240         struct matrix_keymap_data *keymap_data;
 241         uint32_t *keymap, num_rows = 0, num_cols = 0;
 242         struct device_node *np = dev->of_node, *key_np;
 243         unsigned int key_count = 0;
 244
 245         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 246         if (!pdata) {
 247                 dev_err(dev, "could not allocate memory for platform data\n");
 248                 return NULL;
 249         }
 250
 251         of_property_read_u32(np, "samsung,keypad-num-rows", &num_rows);
 252         of_property_read_u32(np, "samsung,keypad-num-columns", &num_cols);
 253         if (!num_rows || !num_cols) {
 254                 dev_err(dev, "number of keypad rows/columns not specified\n");
 255                 return NULL;
 256         }
 257         pdata->rows = num_rows;
 258         pdata->cols = num_cols;
 259
 260         keymap_data = devm_kzalloc(dev, sizeof(*keymap_data), GFP_KERNEL);
 261         if (!keymap_data) {
 262                 dev_err(dev, "could not allocate memory for keymap data\n");
 263                 return NULL;
 264         }
 265         pdata->keymap_data = keymap_data;
 266
 267         for_each_child_of_node(np, key_np)
 268                 key_count++;
 269
 270         keymap_data->keymap_size = key_count;
 271         keymap = devm_kzalloc(dev, sizeof(uint32_t) * key_count, GFP_KERNEL);
 272         if (!keymap) {
 273                 dev_err(dev, "could not allocate memory for keymap\n");
 274                 return NULL;
 275         }
 276         keymap_data->keymap = keymap;
 277
 278         for_each_child_of_node(np, key_np) {
 279                 u32 row, col, key_code;
 280                 of_property_read_u32(key_np, "keypad,row", &row);
 281                 of_property_read_u32(key_np, "keypad,column", &col);
 282                 of_property_read_u32(key_np, "linux,code", &key_code);
 283                 *keymap++ = KEY(row, col, key_code);
 284         }
 285
 286         if (of_get_property(np, "linux,input-no-autorepeat", NULL))
 287                 pdata->no_autorepeat = true;
 288         if (of_get_property(np, "linux,input-wakeup", NULL))
 289                 pdata->wakeup = true;
 290
 291         return pdata;
 292 }
 293
 294 static void samsung_keypad_parse_dt_gpio(struct device *dev,
 295                                 struct samsung_keypad *keypad)
 296 {
 297         struct device_node *np = dev->of_node;
 298         int gpio, ret, row, col;
 299
 300         for (row = 0; row < keypad->rows; row++) {
 301                 gpio = of_get_named_gpio(np, "row-gpios", row);
 302                 keypad->row_gpios[row] = gpio;
 303                 if (!gpio_is_valid(gpio)) {
 304                         dev_err(dev, "keypad row[%d]: invalid gpio %d\n",
 305                                         row, gpio);
 306                         continue;
 307                 }
 308
 309                 ret = gpio_request(gpio, "keypad-row");
 310                 if (ret)
 311                         dev_err(dev, "keypad row[%d] gpio request failed\n",
 312                                         row);
 313         }
 314
 315         for (col = 0; col < keypad->cols; col++) {
 316                 gpio = of_get_named_gpio(np, "col-gpios", col);
 317                 keypad->col_gpios[col] = gpio;
 318                 if (!gpio_is_valid(gpio)) {
 319                         dev_err(dev, "keypad column[%d]: invalid gpio %d\n",
 320                                         col, gpio);
 321                         continue;
 322                 }
 323
 324                 ret = gpio_request(gpio, "keypad-col");
 325                 if (ret)
 326                         dev_err(dev, "keypad column[%d] gpio request failed\n",
 327                                         col);
 328         }
 329 }
 330
 331 static void samsung_keypad_dt_gpio_free(struct samsung_keypad *keypad)
 332 {
 333         int cnt;
 334
 335         for (cnt = 0; cnt < keypad->rows; cnt++)
 336                 if (gpio_is_valid(keypad->row_gpios[cnt]))
 337                         gpio_free(keypad->row_gpios[cnt]);
 338
 339         for (cnt = 0; cnt < keypad->cols; cnt++)
 340                 if (gpio_is_valid(keypad->col_gpios[cnt]))
 341                         gpio_free(keypad->col_gpios[cnt]);
 342 }
 343 #else
 344 static
 345 struct samsung_keypad_platdata *samsung_keypad_parse_dt(struct device *dev)
 346 {
 347         return NULL;
 348 }
 349
 350 static void samsung_keypad_dt_gpio_free(struct samsung_keypad *keypad)
 351 {
 352 }
 353 #endif
 354
 355 static int __devinit samsung_keypad_probe(struct platform_device *pdev)
 356 {
 357         const struct samsung_keypad_platdata *pdata;
 358         const struct matrix_keymap_data *keymap_data;
 359         struct samsung_keypad *keypad;
 360         struct resource *res;
 361         struct input_dev *input_dev;
 362         unsigned int row_shift;
 363         unsigned int keymap_size;
 364         int error;
 365
 366         if (pdev->dev.of_node)
 367                 pdata = samsung_keypad_parse_dt(&pdev->dev);
 368         else
 369                 pdata = pdev->dev.platform_data;
 370         if (!pdata) {
 371                 dev_err(&pdev->dev, "no platform data defined\n");
 372                 return -EINVAL;
 373         }
 374
 375         keymap_data = pdata->keymap_data;
 376         if (!keymap_data) {
 377                 dev_err(&pdev->dev, "no keymap data defined\n");
 378                 return -EINVAL;
 379         }
 380
 381         if (!pdata->rows || pdata->rows > SAMSUNG_MAX_ROWS)
 382                 return -EINVAL;
 383
 384         if (!pdata->cols || pdata->cols > SAMSUNG_MAX_COLS)
 385                 return -EINVAL;
 386
 387         /* initialize the gpio */
 388         if (pdata->cfg_gpio)
 389                 pdata->cfg_gpio(pdata->rows, pdata->cols);
 390
 391         row_shift = get_count_order(pdata->cols);
 392         keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]);
 393
 394         keypad = kzalloc(sizeof(*keypad) + keymap_size, GFP_KERNEL);
 395         input_dev = input_allocate_device();
 396         if (!keypad || !input_dev) {
 397                 error = -ENOMEM;
 398                 goto err_free_mem;
 399         }
 400
 401         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 402         if (!res) {
 403                 error = -ENODEV;
 404                 goto err_free_mem;
 405         }
 406
 407         keypad->base = ioremap(res->start, resource_size(res));
 408         if (!keypad->base) {
 409                 error = -EBUSY;
 410                 goto err_free_mem;
 411         }
 412
 413         keypad->clk = clk_get(&pdev->dev, "keypad");
 414         if (IS_ERR(keypad->clk)) {
 415                 dev_err(&pdev->dev, "failed to get keypad clk\n");
 416                 error = PTR_ERR(keypad->clk);
 417                 goto err_unmap_base;
 418         }
 419
 420         keypad->input_dev = input_dev;
 421         keypad->row_shift = row_shift;
 422         keypad->rows = pdata->rows;
 423         keypad->cols = pdata->cols;
 424         init_waitqueue_head(&keypad->wait);
 425
 426         if (pdev->dev.of_node) {
 427 #ifdef CONFIG_OF
 428                 samsung_keypad_parse_dt_gpio(&pdev->dev, keypad);
 429                 keypad->type = of_device_is_compatible(pdev->dev.of_node,
 430                                         "samsung,s5pv210-keypad");
 431 #endif
 432         } else {
 433                 keypad->type = platform_get_device_id(pdev)->driver_data;
 434         }
 435
 436         input_dev->name = pdev->name;
 437         input_dev->id.bustype = BUS_HOST;
 438         input_dev->dev.parent = &pdev->dev;
 439         input_set_drvdata(input_dev, keypad);
 440
 441         input_dev->open = samsung_keypad_open;
 442         input_dev->close = samsung_keypad_close;
 443
 444         input_dev->evbit[0] = BIT_MASK(EV_KEY);
 445         if (!pdata->no_autorepeat)
 446                 input_dev->evbit[0] |= BIT_MASK(EV_REP);
 447
 448         input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 449
 450         input_dev->keycode = keypad->keycodes;
 451         input_dev->keycodesize = sizeof(keypad->keycodes[0]);
 452         input_dev->keycodemax = pdata->rows << row_shift;
 453
 454         matrix_keypad_build_keymap(keymap_data, row_shift,
 455                         input_dev->keycode, input_dev->keybit);
 456
 457         keypad->irq = platform_get_irq(pdev, 0);
 458         if (keypad->irq < 0) {
 459                 error = keypad->irq;
 460                 goto err_put_clk;
 461         }
 462
 463         error = request_threaded_irq(keypad->irq, NULL, samsung_keypad_irq,
 464                         IRQF_ONESHOT, dev_name(&pdev->dev), keypad);
 465         if (error) {
 466                 dev_err(&pdev->dev, "failed to register keypad interrupt\n");
 467                 goto err_put_clk;
 468         }
 469
 470         error = input_register_device(keypad->input_dev);
 471         if (error)
 472                 goto err_free_irq;
 473
 474         device_init_wakeup(&pdev->dev, pdata->wakeup);
 475         platform_set_drvdata(pdev, keypad);
 476
 477         if (pdev->dev.of_node) {
 478                 devm_kfree(&pdev->dev, (void *)pdata->keymap_data->keymap);
 479                 devm_kfree(&pdev->dev, (void *)pdata->keymap_data);
 480                 devm_kfree(&pdev->dev, (void *)pdata);
 481         }
 482         return 0;
 483
 484 err_free_irq:
 485         free_irq(keypad->irq, keypad);
 486 err_put_clk:
 487         clk_put(keypad->clk);
 488         samsung_keypad_dt_gpio_free(keypad);
 489 err_unmap_base:
 490         iounmap(keypad->base);
 491 err_free_mem:
 492         input_free_device(input_dev);
 493         kfree(keypad);
 494
 495         return error;
 496 }
 497
 498 static int __devexit samsung_keypad_remove(struct platform_device *pdev)
 499 {
 500         struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 501
 502         device_init_wakeup(&pdev->dev, 0);
 503         platform_set_drvdata(pdev, NULL);
 504
 505         input_unregister_device(keypad->input_dev);
 506
 507         /*
 508          * It is safe to free IRQ after unregistering device because
 509          * samsung_keypad_close will shut off interrupts.
 510          */
 511         free_irq(keypad->irq, keypad);
 512
 513         clk_put(keypad->clk);
 514         samsung_keypad_dt_gpio_free(keypad);
 515
 516         iounmap(keypad->base);
 517         kfree(keypad);
 518
 519         return 0;
 520 }
 521
 522 #ifdef CONFIG_PM
 523 static void samsung_keypad_toggle_wakeup(struct samsung_keypad *keypad,
 524                                          bool enable)
 525 {
 526         struct device *dev = keypad->input_dev->dev.parent;
 527         unsigned int val;
 528
 529         clk_enable(keypad->clk);
 530
 531         val = readl(keypad->base + SAMSUNG_KEYIFCON);
 532         if (enable) {
 533                 val |= SAMSUNG_KEYIFCON_WAKEUPEN;
 534                 if (device_may_wakeup(dev))
 535                         enable_irq_wake(keypad->irq);
 536         } else {
 537                 val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
 538                 if (device_may_wakeup(dev))
 539                         disable_irq_wake(keypad->irq);
 540         }
 541         writel(val, keypad->base + SAMSUNG_KEYIFCON);
 542
 543         clk_disable(keypad->clk);
 544 }
 545
 546 static int samsung_keypad_suspend(struct device *dev)
 547 {
 548         struct platform_device *pdev = to_platform_device(dev);
 549         struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 550         struct input_dev *input_dev = keypad->input_dev;
 551
 552         mutex_lock(&input_dev->mutex);
 553
 554         if (input_dev->users)
 555                 samsung_keypad_stop(keypad);
 556
 557         samsung_keypad_toggle_wakeup(keypad, true);
 558
 559         mutex_unlock(&input_dev->mutex);
 560
 561         return 0;
 562 }
 563
 564 static int samsung_keypad_resume(struct device *dev)
 565 {
 566         struct platform_device *pdev = to_platform_device(dev);
 567         struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 568         struct input_dev *input_dev = keypad->input_dev;
 569
 570         mutex_lock(&input_dev->mutex);
 571
 572         samsung_keypad_toggle_wakeup(keypad, false);
 573
 574         if (input_dev->users)
 575                 samsung_keypad_start(keypad);
 576
 577         mutex_unlock(&input_dev->mutex);
 578
 579         return 0;
 580 }
 581
 582 static const struct dev_pm_ops samsung_keypad_pm_ops = {
 583         .suspend        = samsung_keypad_suspend,
 584         .resume         = samsung_keypad_resume,
 585 };
 586 #endif
 587
 588 #ifdef CONFIG_OF
 589 static const struct of_device_id samsung_keypad_dt_match[] = {
 590         { .compatible = "samsung,s3c6410-keypad" },
 591         { .compatible = "samsung,s5pv210-keypad" },
 592         {},
 593 };
 594 MODULE_DEVICE_TABLE(of, samsung_keypad_dt_match);
 595 #else
 596 #define samsung_keypad_dt_match NULL
 597 #endif
 598
 599 static struct platform_device_id samsung_keypad_driver_ids[] = {
 600         {
 601                 .name           = "samsung-keypad",
 602                 .driver_data    = KEYPAD_TYPE_SAMSUNG,
 603         }, {
 604                 .name           = "s5pv210-keypad",
 605                 .driver_data    = KEYPAD_TYPE_S5PV210,
 606         },
 607         { },
 608 };
 609 MODULE_DEVICE_TABLE(platform, samsung_keypad_driver_ids);
 610
 611 static struct platform_driver samsung_keypad_driver = {
 612         .probe          = samsung_keypad_probe,
 613         .remove         = __devexit_p(samsung_keypad_remove),
 614         .driver         = {
 615                 .name   = "samsung-keypad",
 616                 .owner  = THIS_MODULE,
 617                 .of_match_table = samsung_keypad_dt_match,
 618 #ifdef CONFIG_PM
 619                 .pm     = &samsung_keypad_pm_ops,
 620 #endif
 621         },
 622         .id_table       = samsung_keypad_driver_ids,
 623 };
 624
 625 static int __init samsung_keypad_init(void)
 626 {
 627         return platform_driver_register(&samsung_keypad_driver);
 628 }
 629 module_init(samsung_keypad_init);
 630
 631 static void __exit samsung_keypad_exit(void)
 632 {
 633         platform_driver_unregister(&samsung_keypad_driver);
 634 }
 635 module_exit(samsung_keypad_exit);
 636
 637 MODULE_DESCRIPTION("Samsung keypad driver");
 638 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 639 MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
 640 MODULE_LICENSE("GPL");
 641 MODULE_ALIAS("platform:samsung-keypad");