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;
 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         key_count = of_get_child_count(np);
 284         keymap_data->keymap_size = key_count;
 285         keymap = devm_kzalloc(dev, sizeof(uint32_t) * key_count, GFP_KERNEL);
 286         if (!keymap) {
 287                 dev_err(dev, "could not allocate memory for keymap\n");
 288                 return NULL;
 289         }
 290         keymap_data->keymap = keymap;
 291
 292         for_each_child_of_node(np, key_np) {
 293                 u32 row, col, key_code;
 294                 of_property_read_u32(key_np, "keypad,row", &row);
 295                 of_property_read_u32(key_np, "keypad,column", &col);
 296                 of_property_read_u32(key_np, "linux,code", &key_code);
 297                 *keymap++ = KEY(row, col, key_code);
 298         }
 299
 300         if (of_get_property(np, "linux,input-no-autorepeat", NULL))
 301                 pdata->no_autorepeat = true;
 302         if (of_get_property(np, "linux,input-wakeup", NULL))
 303                 pdata->wakeup = true;
 304
 305         return pdata;
 306 }
 307
 308 static void samsung_keypad_parse_dt_gpio(struct device *dev,
 309                                 struct samsung_keypad *keypad)
 310 {
 311         struct device_node *np = dev->of_node;
 312         int gpio, ret, row, col;
 313
 314         for (row = 0; row < keypad->rows; row++) {
 315                 gpio = of_get_named_gpio(np, "row-gpios", row);
 316                 keypad->row_gpios[row] = gpio;
 317                 if (!gpio_is_valid(gpio)) {
 318                         dev_err(dev, "keypad row[%d]: invalid gpio %d\n",
 319                                         row, gpio);
 320                         continue;
 321                 }
 322
 323                 ret = gpio_request(gpio, "keypad-row");
 324                 if (ret)
 325                         dev_err(dev, "keypad row[%d] gpio request failed\n",
 326                                         row);
 327         }
 328
 329         for (col = 0; col < keypad->cols; col++) {
 330                 gpio = of_get_named_gpio(np, "col-gpios", col);
 331                 keypad->col_gpios[col] = gpio;
 332                 if (!gpio_is_valid(gpio)) {
 333                         dev_err(dev, "keypad column[%d]: invalid gpio %d\n",
 334                                         col, gpio);
 335                         continue;
 336                 }
 337
 338                 ret = gpio_request(gpio, "keypad-col");
 339                 if (ret)
 340                         dev_err(dev, "keypad column[%d] gpio request failed\n",
 341                                         col);
 342         }
 343 }
 344
 345 static void samsung_keypad_dt_gpio_free(struct samsung_keypad *keypad)
 346 {
 347         int cnt;
 348
 349         for (cnt = 0; cnt < keypad->rows; cnt++)
 350                 if (gpio_is_valid(keypad->row_gpios[cnt]))
 351                         gpio_free(keypad->row_gpios[cnt]);
 352
 353         for (cnt = 0; cnt < keypad->cols; cnt++)
 354                 if (gpio_is_valid(keypad->col_gpios[cnt]))
 355                         gpio_free(keypad->col_gpios[cnt]);
 356 }
 357 #else
 358 static
 359 struct samsung_keypad_platdata *samsung_keypad_parse_dt(struct device *dev)
 360 {
 361         return NULL;
 362 }
 363
 364 static void samsung_keypad_dt_gpio_free(struct samsung_keypad *keypad)
 365 {
 366 }
 367 #endif
 368
 369 static int samsung_keypad_probe(struct platform_device *pdev)
 370 {
 371         const struct samsung_keypad_platdata *pdata;
 372         const struct matrix_keymap_data *keymap_data;
 373         struct samsung_keypad *keypad;
 374         struct resource *res;
 375         struct input_dev *input_dev;
 376         unsigned int row_shift;
 377         unsigned int keymap_size;
 378         int error;
 379
 380         if (pdev->dev.of_node)
 381                 pdata = samsung_keypad_parse_dt(&pdev->dev);
 382         else
 383                 pdata = pdev->dev.platform_data;
 384         if (!pdata) {
 385                 dev_err(&pdev->dev, "no platform data defined\n");
 386                 return -EINVAL;
 387         }
 388
 389         keymap_data = pdata->keymap_data;
 390         if (!keymap_data) {
 391                 dev_err(&pdev->dev, "no keymap data defined\n");
 392                 return -EINVAL;
 393         }
 394
 395         if (!pdata->rows || pdata->rows > SAMSUNG_MAX_ROWS)
 396                 return -EINVAL;
 397
 398         if (!pdata->cols || pdata->cols > SAMSUNG_MAX_COLS)
 399                 return -EINVAL;
 400
 401         /* initialize the gpio */
 402         if (pdata->cfg_gpio)
 403                 pdata->cfg_gpio(pdata->rows, pdata->cols);
 404
 405         row_shift = get_count_order(pdata->cols);
 406         keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]);
 407
 408         keypad = kzalloc(sizeof(*keypad) + keymap_size, GFP_KERNEL);
 409         input_dev = input_allocate_device();
 410         if (!keypad || !input_dev) {
 411                 error = -ENOMEM;
 412                 goto err_free_mem;
 413         }
 414
 415         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 416         if (!res) {
 417                 error = -ENODEV;
 418                 goto err_free_mem;
 419         }
 420
 421         keypad->base = ioremap(res->start, resource_size(res));
 422         if (!keypad->base) {
 423                 error = -EBUSY;
 424                 goto err_free_mem;
 425         }
 426
 427         keypad->clk = clk_get(&pdev->dev, "keypad");
 428         if (IS_ERR(keypad->clk)) {
 429                 dev_err(&pdev->dev, "failed to get keypad clk\n");
 430                 error = PTR_ERR(keypad->clk);
 431                 goto err_unmap_base;
 432         }
 433
 434         error = clk_prepare(keypad->clk);
 435         if (error) {
 436                 dev_err(&pdev->dev, "keypad clock prepare failed\n");
 437                 goto err_put_clk;
 438         }
 439
 440         keypad->input_dev = input_dev;
 441         keypad->pdev = pdev;
 442         keypad->row_shift = row_shift;
 443         keypad->rows = pdata->rows;
 444         keypad->cols = pdata->cols;
 445         keypad->stopped = true;
 446         init_waitqueue_head(&keypad->wait);
 447
 448         if (pdev->dev.of_node) {
 449 #ifdef CONFIG_OF
 450                 samsung_keypad_parse_dt_gpio(&pdev->dev, keypad);
 451                 keypad->type = of_device_is_compatible(pdev->dev.of_node,
 452                                         "samsung,s5pv210-keypad");
 453 #endif
 454         } else {
 455                 keypad->type = platform_get_device_id(pdev)->driver_data;
 456         }
 457
 458         input_dev->name = pdev->name;
 459         input_dev->id.bustype = BUS_HOST;
 460         input_dev->dev.parent = &pdev->dev;
 461
 462         input_dev->open = samsung_keypad_open;
 463         input_dev->close = samsung_keypad_close;
 464
 465         error = matrix_keypad_build_keymap(keymap_data, NULL,
 466                                            pdata->rows, pdata->cols,
 467                                            keypad->keycodes, input_dev);
 468         if (error) {
 469                 dev_err(&pdev->dev, "failed to build keymap\n");
 470                 goto err_unprepare_clk;
 471         }
 472
 473         input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 474         if (!pdata->no_autorepeat)
 475                 __set_bit(EV_REP, input_dev->evbit);
 476
 477         input_set_drvdata(input_dev, keypad);
 478
 479         keypad->irq = platform_get_irq(pdev, 0);
 480         if (keypad->irq < 0) {
 481                 error = keypad->irq;
 482                 goto err_put_clk;
 483         }
 484
 485         error = request_threaded_irq(keypad->irq, NULL, samsung_keypad_irq,
 486                         IRQF_ONESHOT, dev_name(&pdev->dev), keypad);
 487         if (error) {
 488                 dev_err(&pdev->dev, "failed to register keypad interrupt\n");
 489                 goto err_put_clk;
 490         }
 491
 492         device_init_wakeup(&pdev->dev, pdata->wakeup);
 493         platform_set_drvdata(pdev, keypad);
 494         pm_runtime_enable(&pdev->dev);
 495
 496         error = input_register_device(keypad->input_dev);
 497         if (error)
 498                 goto err_free_irq;
 499
 500         if (pdev->dev.of_node) {
 501                 devm_kfree(&pdev->dev, (void *)pdata->keymap_data->keymap);
 502                 devm_kfree(&pdev->dev, (void *)pdata->keymap_data);
 503                 devm_kfree(&pdev->dev, (void *)pdata);
 504         }
 505         return 0;
 506
 507 err_free_irq:
 508         free_irq(keypad->irq, keypad);
 509         pm_runtime_disable(&pdev->dev);
 510         device_init_wakeup(&pdev->dev, 0);
 511         platform_set_drvdata(pdev, NULL);
 512 err_unprepare_clk:
 513         clk_unprepare(keypad->clk);
 514 err_put_clk:
 515         clk_put(keypad->clk);
 516         samsung_keypad_dt_gpio_free(keypad);
 517 err_unmap_base:
 518         iounmap(keypad->base);
 519 err_free_mem:
 520         input_free_device(input_dev);
 521         kfree(keypad);
 522
 523         return error;
 524 }
 525
 526 static int samsung_keypad_remove(struct platform_device *pdev)
 527 {
 528         struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 529
 530         pm_runtime_disable(&pdev->dev);
 531         device_init_wakeup(&pdev->dev, 0);
 532         platform_set_drvdata(pdev, NULL);
 533
 534         input_unregister_device(keypad->input_dev);
 535
 536         /*
 537          * It is safe to free IRQ after unregistering device because
 538          * samsung_keypad_close will shut off interrupts.
 539          */
 540         free_irq(keypad->irq, keypad);
 541
 542         clk_unprepare(keypad->clk);
 543         clk_put(keypad->clk);
 544         samsung_keypad_dt_gpio_free(keypad);
 545
 546         iounmap(keypad->base);
 547         kfree(keypad);
 548
 549         return 0;
 550 }
 551
 552 #ifdef CONFIG_PM_RUNTIME
 553 static int samsung_keypad_runtime_suspend(struct device *dev)
 554 {
 555         struct platform_device *pdev = to_platform_device(dev);
 556         struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 557         unsigned int val;
 558         int error;
 559
 560         if (keypad->stopped)
 561                 return 0;
 562
 563         /* This may fail on some SoCs due to lack of controller support */
 564         error = enable_irq_wake(keypad->irq);
 565         if (!error)
 566                 keypad->wake_enabled = true;
 567
 568         val = readl(keypad->base + SAMSUNG_KEYIFCON);
 569         val |= SAMSUNG_KEYIFCON_WAKEUPEN;
 570         writel(val, keypad->base + SAMSUNG_KEYIFCON);
 571
 572         clk_disable(keypad->clk);
 573
 574         return 0;
 575 }
 576
 577 static int samsung_keypad_runtime_resume(struct device *dev)
 578 {
 579         struct platform_device *pdev = to_platform_device(dev);
 580         struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 581         unsigned int val;
 582
 583         if (keypad->stopped)
 584                 return 0;
 585
 586         clk_enable(keypad->clk);
 587
 588         val = readl(keypad->base + SAMSUNG_KEYIFCON);
 589         val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
 590         writel(val, keypad->base + SAMSUNG_KEYIFCON);
 591
 592         if (keypad->wake_enabled)
 593                 disable_irq_wake(keypad->irq);
 594
 595         return 0;
 596 }
 597 #endif
 598
 599 #ifdef CONFIG_PM_SLEEP
 600 static void samsung_keypad_toggle_wakeup(struct samsung_keypad *keypad,
 601                                          bool enable)
 602 {
 603         unsigned int val;
 604
 605         clk_enable(keypad->clk);
 606
 607         val = readl(keypad->base + SAMSUNG_KEYIFCON);
 608         if (enable) {
 609                 val |= SAMSUNG_KEYIFCON_WAKEUPEN;
 610                 if (device_may_wakeup(&keypad->pdev->dev))
 611                         enable_irq_wake(keypad->irq);
 612         } else {
 613                 val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
 614                 if (device_may_wakeup(&keypad->pdev->dev))
 615                         disable_irq_wake(keypad->irq);
 616         }
 617         writel(val, keypad->base + SAMSUNG_KEYIFCON);
 618
 619         clk_disable(keypad->clk);
 620 }
 621
 622 static int samsung_keypad_suspend(struct device *dev)
 623 {
 624         struct platform_device *pdev = to_platform_device(dev);
 625         struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 626         struct input_dev *input_dev = keypad->input_dev;
 627
 628         mutex_lock(&input_dev->mutex);
 629
 630         if (input_dev->users)
 631                 samsung_keypad_stop(keypad);
 632
 633         samsung_keypad_toggle_wakeup(keypad, true);
 634
 635         mutex_unlock(&input_dev->mutex);
 636
 637         return 0;
 638 }
 639
 640 static int samsung_keypad_resume(struct device *dev)
 641 {
 642         struct platform_device *pdev = to_platform_device(dev);
 643         struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 644         struct input_dev *input_dev = keypad->input_dev;
 645
 646         mutex_lock(&input_dev->mutex);
 647
 648         samsung_keypad_toggle_wakeup(keypad, false);
 649
 650         if (input_dev->users)
 651                 samsung_keypad_start(keypad);
 652
 653         mutex_unlock(&input_dev->mutex);
 654
 655         return 0;
 656 }
 657 #endif
 658
 659 static const struct dev_pm_ops samsung_keypad_pm_ops = {
 660         SET_SYSTEM_SLEEP_PM_OPS(samsung_keypad_suspend, samsung_keypad_resume)
 661         SET_RUNTIME_PM_OPS(samsung_keypad_runtime_suspend,
 662                            samsung_keypad_runtime_resume, NULL)
 663 };
 664
 665 #ifdef CONFIG_OF
 666 static const struct of_device_id samsung_keypad_dt_match[] = {
 667         { .compatible = "samsung,s3c6410-keypad" },
 668         { .compatible = "samsung,s5pv210-keypad" },
 669         {},
 670 };
 671 MODULE_DEVICE_TABLE(of, samsung_keypad_dt_match);
 672 #endif
 673
 674 static struct platform_device_id samsung_keypad_driver_ids[] = {
 675         {
 676                 .name           = "samsung-keypad",
 677                 .driver_data    = KEYPAD_TYPE_SAMSUNG,
 678         }, {
 679                 .name           = "s5pv210-keypad",
 680                 .driver_data    = KEYPAD_TYPE_S5PV210,
 681         },
 682         { },
 683 };
 684 MODULE_DEVICE_TABLE(platform, samsung_keypad_driver_ids);
 685
 686 static struct platform_driver samsung_keypad_driver = {
 687         .probe          = samsung_keypad_probe,
 688         .remove         = samsung_keypad_remove,
 689         .driver         = {
 690                 .name   = "samsung-keypad",
 691                 .owner  = THIS_MODULE,
 692                 .of_match_table = of_match_ptr(samsung_keypad_dt_match),
 693                 .pm     = &samsung_keypad_pm_ops,
 694         },
 695         .id_table       = samsung_keypad_driver_ids,
 696 };
 697 module_platform_driver(samsung_keypad_driver);
 698
 699 MODULE_DESCRIPTION("Samsung keypad driver");
 700 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 701 MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
 702 MODULE_LICENSE("GPL");