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/pm.h>
  24 #include <linux/pm_runtime.h>
  25 #include <linux/slab.h>
  26 #include <linux/of.h>
  27 #include <linux/of_gpio.h>
  28 #include <linux/sched.h>
  29 #include <linux/input/samsung-keypad.h>
  30
  31 #define SAMSUNG_KEYIFCON                        0x00
  32 #define SAMSUNG_KEYIFSTSCLR                     0x04
  33 #define SAMSUNG_KEYIFCOL                        0x08
  34 #define SAMSUNG_KEYIFROW                        0x0c
  35 #define SAMSUNG_KEYIFFC                         0x10
  36
  37 /* SAMSUNG_KEYIFCON */
  38 #define SAMSUNG_KEYIFCON_INT_F_EN               (1 << 0)
  39 #define SAMSUNG_KEYIFCON_INT_R_EN               (1 << 1)
  40 #define SAMSUNG_KEYIFCON_DF_EN                  (1 << 2)
  41 #define SAMSUNG_KEYIFCON_FC_EN                  (1 << 3)
  42 #define SAMSUNG_KEYIFCON_WAKEUPEN               (1 << 4)
  43
  44 /* SAMSUNG_KEYIFSTSCLR */
  45 #define SAMSUNG_KEYIFSTSCLR_P_INT_MASK          (0xff << 0)
  46 #define SAMSUNG_KEYIFSTSCLR_R_INT_MASK          (0xff << 8)
  47 #define SAMSUNG_KEYIFSTSCLR_R_INT_OFFSET        8
  48 #define S5PV210_KEYIFSTSCLR_P_INT_MASK          (0x3fff << 0)
  49 #define S5PV210_KEYIFSTSCLR_R_INT_MASK          (0x3fff << 16)
  50 #define S5PV210_KEYIFSTSCLR_R_INT_OFFSET        16
  51
  52 /* SAMSUNG_KEYIFCOL */
  53 #define SAMSUNG_KEYIFCOL_MASK                   (0xff << 0)
  54 #define S5PV210_KEYIFCOLEN_MASK                 (0xff << 8)
  55
  56 /* SAMSUNG_KEYIFROW */
  57 #define SAMSUNG_KEYIFROW_MASK                   (0xff << 0)
  58 #define S5PV210_KEYIFROW_MASK                   (0x3fff << 0)
  59
  60 /* SAMSUNG_KEYIFFC */
  61 #define SAMSUNG_KEYIFFC_MASK                    (0x3ff << 0)
  62
  63 enum samsung_keypad_type {
  64         KEYPAD_TYPE_SAMSUNG,
  65         KEYPAD_TYPE_S5PV210,
  66 };
  67
  68 struct samsung_keypad {
  69         struct input_dev *input_dev;
  70         struct platform_device *pdev;
  71         struct clk *clk;
  72         void __iomem *base;
  73         wait_queue_head_t wait;
  74         bool stopped;
  75         bool wake_enabled;
  76         int irq;
  77         enum samsung_keypad_type type;
  78         unsigned int row_shift;
  79         unsigned int rows;
  80         unsigned int cols;
  81         unsigned int row_state[SAMSUNG_MAX_COLS];
  82 #ifdef CONFIG_OF
  83         int row_gpios[SAMSUNG_MAX_ROWS];
  84         int col_gpios[SAMSUNG_MAX_COLS];
  85 #endif
  86         unsigned short keycodes[];
  87 };
  88
  89 static void samsung_keypad_scan(struct samsung_keypad *keypad,
  90                                 unsigned int *row_state)
  91 {
  92         unsigned int col;
  93         unsigned int val;
  94
  95         for (col = 0; col < keypad->cols; col++) {
  96                 if (keypad->type == KEYPAD_TYPE_S5PV210) {
  97                         val = S5PV210_KEYIFCOLEN_MASK;
  98                         val &= ~(1 << col) << 8;
  99                 } else {
 100                         val = SAMSUNG_KEYIFCOL_MASK;
 101                         val &= ~(1 << col);
 102                 }
 103
 104                 writel(val, keypad->base + SAMSUNG_KEYIFCOL);
 105                 mdelay(1);
 106
 107                 val = readl(keypad->base + SAMSUNG_KEYIFROW);
 108                 row_state[col] = ~val & ((1 << keypad->rows) - 1);
 109         }
 110
 111         /* KEYIFCOL reg clear */
 112         writel(0, keypad->base + SAMSUNG_KEYIFCOL);
 113 }
 114
 115 static bool samsung_keypad_report(struct samsung_keypad *keypad,
 116                                   unsigned int *row_state)
 117 {
 118         struct input_dev *input_dev = keypad->input_dev;
 119         unsigned int changed;
 120         unsigned int pressed;
 121         unsigned int key_down = 0;
 122         unsigned int val;
 123         unsigned int col, row;
 124
 125         for (col = 0; col < keypad->cols; col++) {
 126                 changed = row_state[col] ^ keypad->row_state[col];
 127                 key_down |= row_state[col];
 128                 if (!changed)
 129                         continue;
 130
 131                 for (row = 0; row < keypad->rows; row++) {
 132                         if (!(changed & (1 << row)))
 133                                 continue;
 134
 135                         pressed = row_state[col] & (1 << row);
 136
 137                         dev_dbg(&keypad->input_dev->dev,
 138                                 "key %s, row: %d, col: %d\n",
 139                                 pressed ? "pressed" : "released", row, col);
 140
 141                         val = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
 142
 143                         input_event(input_dev, EV_MSC, MSC_SCAN, val);
 144                         input_report_key(input_dev,
 145                                         keypad->keycodes[val], pressed);
 146                 }
 147                 input_sync(keypad->input_dev);
 148         }
 149
 150         memcpy(keypad->row_state, row_state, sizeof(keypad->row_state));
 151
 152         return key_down;
 153 }
 154
 155 static irqreturn_t samsung_keypad_irq(int irq, void *dev_id)
 156 {
 157         struct samsung_keypad *keypad = dev_id;
 158         unsigned int row_state[SAMSUNG_MAX_COLS];
 159         unsigned int val;
 160         bool key_down;
 161
 162         pm_runtime_get_sync(&keypad->pdev->dev);
 163
 164         do {
 165                 val = readl(keypad->base + SAMSUNG_KEYIFSTSCLR);
 166                 /* Clear interrupt. */
 167                 writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
 168
 169                 samsung_keypad_scan(keypad, row_state);
 170
 171                 key_down = samsung_keypad_report(keypad, row_state);
 172                 if (key_down)
 173                         wait_event_timeout(keypad->wait, keypad->stopped,
 174                                            msecs_to_jiffies(50));
 175
 176         } while (key_down && !keypad->stopped);
 177
 178         pm_runtime_put(&keypad->pdev->dev);
 179
 180         return IRQ_HANDLED;
 181 }
 182
 183 static void samsung_keypad_start(struct samsung_keypad *keypad)
 184 {
 185         unsigned int val;
 186
 187         pm_runtime_get_sync(&keypad->pdev->dev);
 188
 189         /* Tell IRQ thread that it may poll the device. */
 190         keypad->stopped = false;
 191
 192         clk_enable(keypad->clk);
 193
 194         /* Enable interrupt bits. */
 195         val = readl(keypad->base + SAMSUNG_KEYIFCON);
 196         val |= SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN;
 197         writel(val, keypad->base + SAMSUNG_KEYIFCON);
 198
 199         /* KEYIFCOL reg clear. */
 200         writel(0, keypad->base + SAMSUNG_KEYIFCOL);
 201
 202         pm_runtime_put(&keypad->pdev->dev);
 203 }
 204
 205 static void samsung_keypad_stop(struct samsung_keypad *keypad)
 206 {
 207         unsigned int val;
 208
 209         pm_runtime_get_sync(&keypad->pdev->dev);
 210
 211         /* Signal IRQ thread to stop polling and disable the handler. */
 212         keypad->stopped = true;
 213         wake_up(&keypad->wait);
 214         disable_irq(keypad->irq);
 215
 216         /* Clear interrupt. */
 217         writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
 218
 219         /* Disable interrupt bits. */
 220         val = readl(keypad->base + SAMSUNG_KEYIFCON);
 221         val &= ~(SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN);
 222         writel(val, keypad->base + SAMSUNG_KEYIFCON);
 223
 224         clk_disable(keypad->clk);
 225
 226         /*
 227          * Now that chip should not generate interrupts we can safely
 228          * re-enable the handler.
 229          */
 230         enable_irq(keypad->irq);
 231
 232         pm_runtime_put(&keypad->pdev->dev);
 233 }
 234
 235 static int samsung_keypad_open(struct input_dev *input_dev)
 236 {
 237         struct samsung_keypad *keypad = input_get_drvdata(input_dev);
 238
 239         samsung_keypad_start(keypad);
 240
 241         return 0;
 242 }
 243
 244 static void samsung_keypad_close(struct input_dev *input_dev)
 245 {
 246         struct samsung_keypad *keypad = input_get_drvdata(input_dev);
 247
 248         samsung_keypad_stop(keypad);
 249 }
 250
 251 #ifdef CONFIG_OF
 252 static struct samsung_keypad_platdata *samsung_keypad_parse_dt(
 253                                 struct device *dev)
 254 {
 255         struct samsung_keypad_platdata *pdata;
 256         struct matrix_keymap_data *keymap_data;
 257         uint32_t *keymap, num_rows = 0, num_cols = 0;
 258         struct device_node *np = dev->of_node, *key_np;
 259         unsigned int key_count = 0;
 260
 261         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 262         if (!pdata) {
 263                 dev_err(dev, "could not allocate memory for platform data\n");
 264                 return NULL;
 265         }
 266
 267         of_property_read_u32(np, "samsung,keypad-num-rows", &num_rows);
 268         of_property_read_u32(np, "samsung,keypad-num-columns", &num_cols);
 269         if (!num_rows || !num_cols) {
 270                 dev_err(dev, "number of keypad rows/columns not specified\n");
 271                 return NULL;
 272         }
 273         pdata->rows = num_rows;
 274         pdata->cols = num_cols;
 275
 276         keymap_data = devm_kzalloc(dev, sizeof(*keymap_data), GFP_KERNEL);
 277         if (!keymap_data) {
 278                 dev_err(dev, "could not allocate memory for keymap data\n");
 279                 return NULL;
 280         }
 281         pdata->keymap_data = keymap_data;
 282
 283         for_each_child_of_node(np, key_np)
 284                 key_count++;
 285
 286         keymap_data->keymap_size = key_count;
 287         keymap = devm_kzalloc(dev, sizeof(uint32_t) * key_count, GFP_KERNEL);
 288         if (!keymap) {
 289                 dev_err(dev, "could not allocate memory for keymap\n");
 290                 return NULL;
 291         }
 292         keymap_data->keymap = keymap;
 293
 294         for_each_child_of_node(np, key_np) {
 295                 u32 row, col, key_code;
 296                 of_property_read_u32(key_np, "keypad,row", &row);
 297                 of_property_read_u32(key_np, "keypad,column", &col);
 298                 of_property_read_u32(key_np, "linux,code", &key_code);
 299                 *keymap++ = KEY(row, col, key_code);
 300         }
 301
 302         if (of_get_property(np, "linux,input-no-autorepeat", NULL))
 303                 pdata->no_autorepeat = true;
 304         if (of_get_property(np, "linux,input-wakeup", NULL))
 305                 pdata->wakeup = true;
 306
 307         return pdata;
 308 }
 309
 310 static void samsung_keypad_parse_dt_gpio(struct device *dev,
 311                                 struct samsung_keypad *keypad)
 312 {
 313         struct device_node *np = dev->of_node;
 314         int gpio, ret, row, col;
 315
 316         for (row = 0; row < keypad->rows; row++) {
 317                 gpio = of_get_named_gpio(np, "row-gpios", row);
 318                 keypad->row_gpios[row] = gpio;
 319                 if (!gpio_is_valid(gpio)) {
 320                         dev_err(dev, "keypad row[%d]: invalid gpio %d\n",
 321                                         row, gpio);
 322                         continue;
 323                 }
 324
 325                 ret = gpio_request(gpio, "keypad-row");
 326                 if (ret)
 327                         dev_err(dev, "keypad row[%d] gpio request failed\n",
 328                                         row);
 329         }
 330
 331         for (col = 0; col < keypad->cols; col++) {
 332                 gpio = of_get_named_gpio(np, "col-gpios", col);
 333                 keypad->col_gpios[col] = gpio;
 334                 if (!gpio_is_valid(gpio)) {
 335                         dev_err(dev, "keypad column[%d]: invalid gpio %d\n",
 336                                         col, gpio);
 337                         continue;
 338                 }
 339
 340                 ret = gpio_request(gpio, "keypad-col");
 341                 if (ret)
 342                         dev_err(dev, "keypad column[%d] gpio request failed\n",
 343                                         col);
 344         }
 345 }
 346
 347 static void samsung_keypad_dt_gpio_free(struct samsung_keypad *keypad)
 348 {
 349         int cnt;
 350
 351         for (cnt = 0; cnt < keypad->rows; cnt++)
 352                 if (gpio_is_valid(keypad->row_gpios[cnt]))
 353                         gpio_free(keypad->row_gpios[cnt]);
 354
 355         for (cnt = 0; cnt < keypad->cols; cnt++)
 356                 if (gpio_is_valid(keypad->col_gpios[cnt]))
 357                         gpio_free(keypad->col_gpios[cnt]);
 358 }
 359 #else
 360 static
 361 struct samsung_keypad_platdata *samsung_keypad_parse_dt(struct device *dev)
 362 {
 363         return NULL;
 364 }
 365
 366 static void samsung_keypad_dt_gpio_free(struct samsung_keypad *keypad)
 367 {
 368 }
 369 #endif
 370
 371 static int __devinit samsung_keypad_probe(struct platform_device *pdev)
 372 {
 373         const struct samsung_keypad_platdata *pdata;
 374         const struct matrix_keymap_data *keymap_data;
 375         struct samsung_keypad *keypad;
 376         struct resource *res;
 377         struct input_dev *input_dev;
 378         unsigned int row_shift;
 379         unsigned int keymap_size;
 380         int error;
 381
 382         if (pdev->dev.of_node)
 383                 pdata = samsung_keypad_parse_dt(&pdev->dev);
 384         else
 385                 pdata = pdev->dev.platform_data;
 386         if (!pdata) {
 387                 dev_err(&pdev->dev, "no platform data defined\n");
 388                 return -EINVAL;
 389         }
 390
 391         keymap_data = pdata->keymap_data;
 392         if (!keymap_data) {
 393                 dev_err(&pdev->dev, "no keymap data defined\n");
 394                 return -EINVAL;
 395         }
 396
 397         if (!pdata->rows || pdata->rows > SAMSUNG_MAX_ROWS)
 398                 return -EINVAL;
 399
 400         if (!pdata->cols || pdata->cols > SAMSUNG_MAX_COLS)
 401                 return -EINVAL;
 402
 403         /* initialize the gpio */
 404         if (pdata->cfg_gpio)
 405                 pdata->cfg_gpio(pdata->rows, pdata->cols);
 406
 407         row_shift = get_count_order(pdata->cols);
 408         keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]);
 409
 410         keypad = kzalloc(sizeof(*keypad) + keymap_size, GFP_KERNEL);
 411         input_dev = input_allocate_device();
 412         if (!keypad || !input_dev) {
 413                 error = -ENOMEM;
 414                 goto err_free_mem;
 415         }
 416
 417         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 418         if (!res) {
 419                 error = -ENODEV;
 420                 goto err_free_mem;
 421         }
 422
 423         keypad->base = ioremap(res->start, resource_size(res));
 424         if (!keypad->base) {
 425                 error = -EBUSY;
 426                 goto err_free_mem;
 427         }
 428
 429         keypad->clk = clk_get(&pdev->dev, "keypad");
 430         if (IS_ERR(keypad->clk)) {
 431                 dev_err(&pdev->dev, "failed to get keypad clk\n");
 432                 error = PTR_ERR(keypad->clk);
 433                 goto err_unmap_base;
 434         }
 435
 436         keypad->input_dev = input_dev;
 437         keypad->pdev = pdev;
 438         keypad->row_shift = row_shift;
 439         keypad->rows = pdata->rows;
 440         keypad->cols = pdata->cols;
 441         keypad->stopped = true;
 442         init_waitqueue_head(&keypad->wait);
 443
 444         if (pdev->dev.of_node) {
 445 #ifdef CONFIG_OF
 446                 samsung_keypad_parse_dt_gpio(&pdev->dev, keypad);
 447                 keypad->type = of_device_is_compatible(pdev->dev.of_node,
 448                                         "samsung,s5pv210-keypad");
 449 #endif
 450         } else {
 451                 keypad->type = platform_get_device_id(pdev)->driver_data;
 452         }
 453
 454         input_dev->name = pdev->name;
 455         input_dev->id.bustype = BUS_HOST;
 456         input_dev->dev.parent = &pdev->dev;
 457
 458         input_dev->open = samsung_keypad_open;
 459         input_dev->close = samsung_keypad_close;
 460
 461         error = matrix_keypad_build_keymap(keymap_data, NULL,
 462                                            pdata->rows, pdata->cols,
 463                                            keypad->keycodes, input_dev);
 464         if (error) {
 465                 dev_err(&pdev->dev, "failed to build keymap\n");
 466                 goto err_put_clk;
 467         }
 468
 469         input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 470         if (!pdata->no_autorepeat)
 471                 __set_bit(EV_REP, input_dev->evbit);
 472
 473         input_set_drvdata(input_dev, keypad);
 474
 475         keypad->irq = platform_get_irq(pdev, 0);
 476         if (keypad->irq < 0) {
 477                 error = keypad->irq;
 478                 goto err_put_clk;
 479         }
 480
 481         error = request_threaded_irq(keypad->irq, NULL, samsung_keypad_irq,
 482                         IRQF_ONESHOT, dev_name(&pdev->dev), keypad);
 483         if (error) {
 484                 dev_err(&pdev->dev, "failed to register keypad interrupt\n");
 485                 goto err_put_clk;
 486         }
 487
 488         device_init_wakeup(&pdev->dev, pdata->wakeup);
 489         platform_set_drvdata(pdev, keypad);
 490         pm_runtime_enable(&pdev->dev);
 491
 492         error = input_register_device(keypad->input_dev);
 493         if (error)
 494                 goto err_free_irq;
 495
 496         if (pdev->dev.of_node) {
 497                 devm_kfree(&pdev->dev, (void *)pdata->keymap_data->keymap);
 498                 devm_kfree(&pdev->dev, (void *)pdata->keymap_data);
 499                 devm_kfree(&pdev->dev, (void *)pdata);
 500         }
 501         return 0;
 502
 503 err_free_irq:
 504         free_irq(keypad->irq, keypad);
 505         pm_runtime_disable(&pdev->dev);
 506         device_init_wakeup(&pdev->dev, 0);
 507         platform_set_drvdata(pdev, NULL);
 508 err_put_clk:
 509         clk_put(keypad->clk);
 510         samsung_keypad_dt_gpio_free(keypad);
 511 err_unmap_base:
 512         iounmap(keypad->base);
 513 err_free_mem:
 514         input_free_device(input_dev);
 515         kfree(keypad);
 516
 517         return error;
 518 }
 519
 520 static int __devexit samsung_keypad_remove(struct platform_device *pdev)
 521 {
 522         struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 523
 524         pm_runtime_disable(&pdev->dev);
 525         device_init_wakeup(&pdev->dev, 0);
 526         platform_set_drvdata(pdev, NULL);
 527
 528         input_unregister_device(keypad->input_dev);
 529
 530         /*
 531          * It is safe to free IRQ after unregistering device because
 532          * samsung_keypad_close will shut off interrupts.
 533          */
 534         free_irq(keypad->irq, keypad);
 535
 536         clk_put(keypad->clk);
 537         samsung_keypad_dt_gpio_free(keypad);
 538
 539         iounmap(keypad->base);
 540         kfree(keypad);
 541
 542         return 0;
 543 }
 544
 545 #ifdef CONFIG_PM_RUNTIME
 546 static int samsung_keypad_runtime_suspend(struct device *dev)
 547 {
 548         struct platform_device *pdev = to_platform_device(dev);
 549         struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 550         unsigned int val;
 551         int error;
 552
 553         if (keypad->stopped)
 554                 return 0;
 555
 556         /* This may fail on some SoCs due to lack of controller support */
 557         error = enable_irq_wake(keypad->irq);
 558         if (!error)
 559                 keypad->wake_enabled = true;
 560
 561         val = readl(keypad->base + SAMSUNG_KEYIFCON);
 562         val |= SAMSUNG_KEYIFCON_WAKEUPEN;
 563         writel(val, keypad->base + SAMSUNG_KEYIFCON);
 564
 565         clk_disable(keypad->clk);
 566
 567         return 0;
 568 }
 569
 570 static int samsung_keypad_runtime_resume(struct device *dev)
 571 {
 572         struct platform_device *pdev = to_platform_device(dev);
 573         struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 574         unsigned int val;
 575
 576         if (keypad->stopped)
 577                 return 0;
 578
 579         clk_enable(keypad->clk);
 580
 581         val = readl(keypad->base + SAMSUNG_KEYIFCON);
 582         val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
 583         writel(val, keypad->base + SAMSUNG_KEYIFCON);
 584
 585         if (keypad->wake_enabled)
 586                 disable_irq_wake(keypad->irq);
 587
 588         return 0;
 589 }
 590 #endif
 591
 592 #ifdef CONFIG_PM_SLEEP
 593 static void samsung_keypad_toggle_wakeup(struct samsung_keypad *keypad,
 594                                          bool enable)
 595 {
 596         unsigned int val;
 597
 598         clk_enable(keypad->clk);
 599
 600         val = readl(keypad->base + SAMSUNG_KEYIFCON);
 601         if (enable) {
 602                 val |= SAMSUNG_KEYIFCON_WAKEUPEN;
 603                 if (device_may_wakeup(&keypad->pdev->dev))
 604                         enable_irq_wake(keypad->irq);
 605         } else {
 606                 val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
 607                 if (device_may_wakeup(&keypad->pdev->dev))
 608                         disable_irq_wake(keypad->irq);
 609         }
 610         writel(val, keypad->base + SAMSUNG_KEYIFCON);
 611
 612         clk_disable(keypad->clk);
 613 }
 614
 615 static int samsung_keypad_suspend(struct device *dev)
 616 {
 617         struct platform_device *pdev = to_platform_device(dev);
 618         struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 619         struct input_dev *input_dev = keypad->input_dev;
 620
 621         mutex_lock(&input_dev->mutex);
 622
 623         if (input_dev->users)
 624                 samsung_keypad_stop(keypad);
 625
 626         samsung_keypad_toggle_wakeup(keypad, true);
 627
 628         mutex_unlock(&input_dev->mutex);
 629
 630         return 0;
 631 }
 632
 633 static int samsung_keypad_resume(struct device *dev)
 634 {
 635         struct platform_device *pdev = to_platform_device(dev);
 636         struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 637         struct input_dev *input_dev = keypad->input_dev;
 638
 639         mutex_lock(&input_dev->mutex);
 640
 641         samsung_keypad_toggle_wakeup(keypad, false);
 642
 643         if (input_dev->users)
 644                 samsung_keypad_start(keypad);
 645
 646         mutex_unlock(&input_dev->mutex);
 647
 648         return 0;
 649 }
 650 #endif
 651
 652 static const struct dev_pm_ops samsung_keypad_pm_ops = {
 653         SET_SYSTEM_SLEEP_PM_OPS(samsung_keypad_suspend, samsung_keypad_resume)
 654         SET_RUNTIME_PM_OPS(samsung_keypad_runtime_suspend,
 655                            samsung_keypad_runtime_resume, NULL)
 656 };
 657
 658 #ifdef CONFIG_OF
 659 static const struct of_device_id samsung_keypad_dt_match[] = {
 660         { .compatible = "samsung,s3c6410-keypad" },
 661         { .compatible = "samsung,s5pv210-keypad" },
 662         {},
 663 };
 664 MODULE_DEVICE_TABLE(of, samsung_keypad_dt_match);
 665 #else
 666 #define samsung_keypad_dt_match NULL
 667 #endif
 668
 669 static struct platform_device_id samsung_keypad_driver_ids[] = {
 670         {
 671                 .name           = "samsung-keypad",
 672                 .driver_data    = KEYPAD_TYPE_SAMSUNG,
 673         }, {
 674                 .name           = "s5pv210-keypad",
 675                 .driver_data    = KEYPAD_TYPE_S5PV210,
 676         },
 677         { },
 678 };
 679 MODULE_DEVICE_TABLE(platform, samsung_keypad_driver_ids);
 680
 681 static struct platform_driver samsung_keypad_driver = {
 682         .probe          = samsung_keypad_probe,
 683         .remove         = __devexit_p(samsung_keypad_remove),
 684         .driver         = {
 685                 .name   = "samsung-keypad",
 686                 .owner  = THIS_MODULE,
 687                 .of_match_table = samsung_keypad_dt_match,
 688                 .pm     = &samsung_keypad_pm_ops,
 689         },
 690         .id_table       = samsung_keypad_driver_ids,
 691 };
 692 module_platform_driver(samsung_keypad_driver);
 693
 694 MODULE_DESCRIPTION("Samsung keypad driver");
 695 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 696 MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
 697 MODULE_LICENSE("GPL");