kernel/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/input.h>
  18 #include <linux/interrupt.h>
  19 #include <linux/io.h>
  20 #include <linux/module.h>
  21 #include <linux/platform_device.h>
  22 #include <linux/pm.h>
  23 #include <linux/pm_runtime.h>
  24 #include <linux/slab.h>
  25 #include <linux/of.h>
  26 #include <linux/sched.h>
  27 #include <linux/input/samsung-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 platform_device *pdev;
  69         struct clk *clk;
  70         void __iomem *base;
  71         wait_queue_head_t wait;
  72         bool stopped;
  73         bool wake_enabled;
  74         int irq;
  75         enum samsung_keypad_type type;
  76         unsigned int row_shift;
  77         unsigned int rows;
  78         unsigned int cols;
  79         unsigned int row_state[SAMSUNG_MAX_COLS];
  80         unsigned short keycodes[];
  81 };
  82
  83 static void samsung_keypad_scan(struct samsung_keypad *keypad,
  84                                 unsigned int *row_state)
  85 {
  86         unsigned int col;
  87         unsigned int val;
  88
  89         for (col = 0; col < keypad->cols; col++) {
  90                 if (keypad->type == KEYPAD_TYPE_S5PV210) {
  91                         val = S5PV210_KEYIFCOLEN_MASK;
  92                         val &= ~(1 << col) << 8;
  93                 } else {
  94                         val = SAMSUNG_KEYIFCOL_MASK;
  95                         val &= ~(1 << col);
  96                 }
  97
  98                 writel(val, keypad->base + SAMSUNG_KEYIFCOL);
  99                 mdelay(1);
 100
 101                 val = readl(keypad->base + SAMSUNG_KEYIFROW);
 102                 row_state[col] = ~val & ((1 << keypad->rows) - 1);
 103         }
 104
 105         /* KEYIFCOL reg clear */
 106         writel(0, keypad->base + SAMSUNG_KEYIFCOL);
 107 }
 108
 109 static bool samsung_keypad_report(struct samsung_keypad *keypad,
 110                                   unsigned int *row_state)
 111 {
 112         struct input_dev *input_dev = keypad->input_dev;
 113         unsigned int changed;
 114         unsigned int pressed;
 115         unsigned int key_down = 0;
 116         unsigned int val;
 117         unsigned int col, row;
 118
 119         for (col = 0; col < keypad->cols; col++) {
 120                 changed = row_state[col] ^ keypad->row_state[col];
 121                 key_down |= row_state[col];
 122                 if (!changed)
 123                         continue;
 124
 125                 for (row = 0; row < keypad->rows; row++) {
 126                         if (!(changed & (1 << row)))
 127                                 continue;
 128
 129                         pressed = row_state[col] & (1 << row);
 130
 131                         dev_dbg(&keypad->input_dev->dev,
 132                                 "key %s, row: %d, col: %d\n",
 133                                 pressed ? "pressed" : "released", row, col);
 134
 135                         val = MATRIX_SCAN_CODE(row, col, keypad->row_shift);
 136
 137                         input_event(input_dev, EV_MSC, MSC_SCAN, val);
 138                         input_report_key(input_dev,
 139                                         keypad->keycodes[val], pressed);
 140                 }
 141                 input_sync(keypad->input_dev);
 142         }
 143
 144         memcpy(keypad->row_state, row_state, sizeof(keypad->row_state));
 145
 146         return key_down;
 147 }
 148
 149 static irqreturn_t samsung_keypad_irq(int irq, void *dev_id)
 150 {
 151         struct samsung_keypad *keypad = dev_id;
 152         unsigned int row_state[SAMSUNG_MAX_COLS];
 153         unsigned int val;
 154         bool key_down;
 155
 156         pm_runtime_get_sync(&keypad->pdev->dev);
 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         pm_runtime_put(&keypad->pdev->dev);
 173
 174         return IRQ_HANDLED;
 175 }
 176
 177 static void samsung_keypad_start(struct samsung_keypad *keypad)
 178 {
 179         unsigned int val;
 180
 181         pm_runtime_get_sync(&keypad->pdev->dev);
 182
 183         /* Tell IRQ thread that it may poll the device. */
 184         keypad->stopped = false;
 185
 186         clk_enable(keypad->clk);
 187
 188         /* Enable interrupt bits. */
 189         val = readl(keypad->base + SAMSUNG_KEYIFCON);
 190         val |= SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN;
 191         writel(val, keypad->base + SAMSUNG_KEYIFCON);
 192
 193         /* KEYIFCOL reg clear. */
 194         writel(0, keypad->base + SAMSUNG_KEYIFCOL);
 195
 196         pm_runtime_put(&keypad->pdev->dev);
 197 }
 198
 199 static void samsung_keypad_stop(struct samsung_keypad *keypad)
 200 {
 201         unsigned int val;
 202
 203         pm_runtime_get_sync(&keypad->pdev->dev);
 204
 205         /* Signal IRQ thread to stop polling and disable the handler. */
 206         keypad->stopped = true;
 207         wake_up(&keypad->wait);
 208         disable_irq(keypad->irq);
 209
 210         /* Clear interrupt. */
 211         writel(~0x0, keypad->base + SAMSUNG_KEYIFSTSCLR);
 212
 213         /* Disable interrupt bits. */
 214         val = readl(keypad->base + SAMSUNG_KEYIFCON);
 215         val &= ~(SAMSUNG_KEYIFCON_INT_F_EN | SAMSUNG_KEYIFCON_INT_R_EN);
 216         writel(val, keypad->base + SAMSUNG_KEYIFCON);
 217
 218         clk_disable(keypad->clk);
 219
 220         /*
 221          * Now that chip should not generate interrupts we can safely
 222          * re-enable the handler.
 223          */
 224         enable_irq(keypad->irq);
 225
 226         pm_runtime_put(&keypad->pdev->dev);
 227 }
 228
 229 static int samsung_keypad_open(struct input_dev *input_dev)
 230 {
 231         struct samsung_keypad *keypad = input_get_drvdata(input_dev);
 232
 233         samsung_keypad_start(keypad);
 234
 235         return 0;
 236 }
 237
 238 static void samsung_keypad_close(struct input_dev *input_dev)
 239 {
 240         struct samsung_keypad *keypad = input_get_drvdata(input_dev);
 241
 242         samsung_keypad_stop(keypad);
 243 }
 244
 245 #ifdef CONFIG_OF
 246 static struct samsung_keypad_platdata *
 247 samsung_keypad_parse_dt(struct device *dev)
 248 {
 249         struct samsung_keypad_platdata *pdata;
 250         struct matrix_keymap_data *keymap_data;
 251         uint32_t *keymap, num_rows = 0, num_cols = 0;
 252         struct device_node *np = dev->of_node, *key_np;
 253         unsigned int key_count;
 254
 255         if (!np) {
 256                 dev_err(dev, "missing device tree data\n");
 257                 return ERR_PTR(-EINVAL);
 258         }
 259
 260         pdata = devm_kzalloc(dev, sizeof(*pdata), GFP_KERNEL);
 261         if (!pdata) {
 262                 dev_err(dev, "could not allocate memory for platform data\n");
 263                 return ERR_PTR(-ENOMEM);
 264         }
 265
 266         of_property_read_u32(np, "samsung,keypad-num-rows", &num_rows);
 267         of_property_read_u32(np, "samsung,keypad-num-columns", &num_cols);
 268         if (!num_rows || !num_cols) {
 269                 dev_err(dev, "number of keypad rows/columns not specified\n");
 270                 return ERR_PTR(-EINVAL);
 271         }
 272         pdata->rows = num_rows;
 273         pdata->cols = num_cols;
 274
 275         keymap_data = devm_kzalloc(dev, sizeof(*keymap_data), GFP_KERNEL);
 276         if (!keymap_data) {
 277                 dev_err(dev, "could not allocate memory for keymap data\n");
 278                 return ERR_PTR(-ENOMEM);
 279         }
 280         pdata->keymap_data = keymap_data;
 281
 282         key_count = of_get_child_count(np);
 283         keymap_data->keymap_size = key_count;
 284         keymap = devm_kzalloc(dev, sizeof(uint32_t) * key_count, GFP_KERNEL);
 285         if (!keymap) {
 286                 dev_err(dev, "could not allocate memory for keymap\n");
 287                 return ERR_PTR(-ENOMEM);
 288         }
 289         keymap_data->keymap = keymap;
 290
 291         for_each_child_of_node(np, key_np) {
 292                 u32 row, col, key_code;
 293                 of_property_read_u32(key_np, "keypad,row", &row);
 294                 of_property_read_u32(key_np, "keypad,column", &col);
 295                 of_property_read_u32(key_np, "linux,code", &key_code);
 296                 *keymap++ = KEY(row, col, key_code);
 297         }
 298
 299         if (of_get_property(np, "linux,input-no-autorepeat", NULL))
 300                 pdata->no_autorepeat = true;
 301
 302         if (of_get_property(np, "linux,input-wakeup", NULL))
 303                 pdata->wakeup = true;
 304
 305         return pdata;
 306 }
 307 #else
 308 static struct samsung_keypad_platdata *
 309 samsung_keypad_parse_dt(struct device *dev)
 310 {
 311         dev_err(dev, "no platform data defined\n");
 312
 313         return ERR_PTR(-EINVAL);
 314 }
 315 #endif
 316
 317 static int samsung_keypad_probe(struct platform_device *pdev)
 318 {
 319         const struct samsung_keypad_platdata *pdata;
 320         const struct matrix_keymap_data *keymap_data;
 321         struct samsung_keypad *keypad;
 322         struct resource *res;
 323         struct input_dev *input_dev;
 324         unsigned int row_shift;
 325         unsigned int keymap_size;
 326         int error;
 327
 328         pdata = dev_get_platdata(&pdev->dev);
 329         if (!pdata) {
 330                 pdata = samsung_keypad_parse_dt(&pdev->dev);
 331                 if (IS_ERR(pdata))
 332                         return PTR_ERR(pdata);
 333         }
 334
 335         keymap_data = pdata->keymap_data;
 336         if (!keymap_data) {
 337                 dev_err(&pdev->dev, "no keymap data defined\n");
 338                 return -EINVAL;
 339         }
 340
 341         if (!pdata->rows || pdata->rows > SAMSUNG_MAX_ROWS)
 342                 return -EINVAL;
 343
 344         if (!pdata->cols || pdata->cols > SAMSUNG_MAX_COLS)
 345                 return -EINVAL;
 346
 347         /* initialize the gpio */
 348         if (pdata->cfg_gpio)
 349                 pdata->cfg_gpio(pdata->rows, pdata->cols);
 350
 351         row_shift = get_count_order(pdata->cols);
 352         keymap_size = (pdata->rows << row_shift) * sizeof(keypad->keycodes[0]);
 353
 354         keypad = devm_kzalloc(&pdev->dev, sizeof(*keypad) + keymap_size,
 355                               GFP_KERNEL);
 356         input_dev = devm_input_allocate_device(&pdev->dev);
 357         if (!keypad || !input_dev)
 358                 return -ENOMEM;
 359
 360         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 361         if (!res)
 362                 return -ENODEV;
 363
 364         keypad->base = devm_ioremap(&pdev->dev, res->start, resource_size(res));
 365         if (!keypad->base)
 366                 return -EBUSY;
 367
 368         keypad->clk = devm_clk_get(&pdev->dev, "keypad");
 369         if (IS_ERR(keypad->clk)) {
 370                 dev_err(&pdev->dev, "failed to get keypad clk\n");
 371                 return PTR_ERR(keypad->clk);
 372         }
 373
 374         error = clk_prepare(keypad->clk);
 375         if (error) {
 376                 dev_err(&pdev->dev, "keypad clock prepare failed\n");
 377                 return error;
 378         }
 379
 380         keypad->input_dev = input_dev;
 381         keypad->pdev = pdev;
 382         keypad->row_shift = row_shift;
 383         keypad->rows = pdata->rows;
 384         keypad->cols = pdata->cols;
 385         keypad->stopped = true;
 386         init_waitqueue_head(&keypad->wait);
 387
 388         if (pdev->dev.of_node)
 389                 keypad->type = of_device_is_compatible(pdev->dev.of_node,
 390                                         "samsung,s5pv210-keypad");
 391         else
 392                 keypad->type = platform_get_device_id(pdev)->driver_data;
 393
 394         input_dev->name = pdev->name;
 395         input_dev->id.bustype = BUS_HOST;
 396         input_dev->dev.parent = &pdev->dev;
 397
 398         input_dev->open = samsung_keypad_open;
 399         input_dev->close = samsung_keypad_close;
 400
 401         error = matrix_keypad_build_keymap(keymap_data, NULL,
 402                                            pdata->rows, pdata->cols,
 403                                            keypad->keycodes, input_dev);
 404         if (error) {
 405                 dev_err(&pdev->dev, "failed to build keymap\n");
 406                 goto err_unprepare_clk;
 407         }
 408
 409         input_set_capability(input_dev, EV_MSC, MSC_SCAN);
 410         if (!pdata->no_autorepeat)
 411                 __set_bit(EV_REP, input_dev->evbit);
 412
 413         input_set_drvdata(input_dev, keypad);
 414
 415         keypad->irq = platform_get_irq(pdev, 0);
 416         if (keypad->irq < 0) {
 417                 error = keypad->irq;
 418                 goto err_unprepare_clk;
 419         }
 420
 421         error = devm_request_threaded_irq(&pdev->dev, keypad->irq, NULL,
 422                                           samsung_keypad_irq, IRQF_ONESHOT,
 423                                           dev_name(&pdev->dev), keypad);
 424         if (error) {
 425                 dev_err(&pdev->dev, "failed to register keypad interrupt\n");
 426                 goto err_unprepare_clk;
 427         }
 428
 429         device_init_wakeup(&pdev->dev, pdata->wakeup);
 430         platform_set_drvdata(pdev, keypad);
 431         pm_runtime_enable(&pdev->dev);
 432
 433         error = input_register_device(keypad->input_dev);
 434         if (error)
 435                 goto err_disable_runtime_pm;
 436
 437         if (pdev->dev.of_node) {
 438                 devm_kfree(&pdev->dev, (void *)pdata->keymap_data->keymap);
 439                 devm_kfree(&pdev->dev, (void *)pdata->keymap_data);
 440                 devm_kfree(&pdev->dev, (void *)pdata);
 441         }
 442         return 0;
 443
 444 err_disable_runtime_pm:
 445         pm_runtime_disable(&pdev->dev);
 446         device_init_wakeup(&pdev->dev, 0);
 447 err_unprepare_clk:
 448         clk_unprepare(keypad->clk);
 449         return error;
 450 }
 451
 452 static int samsung_keypad_remove(struct platform_device *pdev)
 453 {
 454         struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 455
 456         pm_runtime_disable(&pdev->dev);
 457         device_init_wakeup(&pdev->dev, 0);
 458
 459         input_unregister_device(keypad->input_dev);
 460
 461         clk_unprepare(keypad->clk);
 462
 463         return 0;
 464 }
 465
 466 #ifdef CONFIG_PM
 467 static int samsung_keypad_runtime_suspend(struct device *dev)
 468 {
 469         struct platform_device *pdev = to_platform_device(dev);
 470         struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 471         unsigned int val;
 472         int error;
 473
 474         if (keypad->stopped)
 475                 return 0;
 476
 477         /* This may fail on some SoCs due to lack of controller support */
 478         error = enable_irq_wake(keypad->irq);
 479         if (!error)
 480                 keypad->wake_enabled = true;
 481
 482         val = readl(keypad->base + SAMSUNG_KEYIFCON);
 483         val |= SAMSUNG_KEYIFCON_WAKEUPEN;
 484         writel(val, keypad->base + SAMSUNG_KEYIFCON);
 485
 486         clk_disable(keypad->clk);
 487
 488         return 0;
 489 }
 490
 491 static int samsung_keypad_runtime_resume(struct device *dev)
 492 {
 493         struct platform_device *pdev = to_platform_device(dev);
 494         struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 495         unsigned int val;
 496
 497         if (keypad->stopped)
 498                 return 0;
 499
 500         clk_enable(keypad->clk);
 501
 502         val = readl(keypad->base + SAMSUNG_KEYIFCON);
 503         val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
 504         writel(val, keypad->base + SAMSUNG_KEYIFCON);
 505
 506         if (keypad->wake_enabled)
 507                 disable_irq_wake(keypad->irq);
 508
 509         return 0;
 510 }
 511 #endif
 512
 513 #ifdef CONFIG_PM_SLEEP
 514 static void samsung_keypad_toggle_wakeup(struct samsung_keypad *keypad,
 515                                          bool enable)
 516 {
 517         unsigned int val;
 518
 519         clk_enable(keypad->clk);
 520
 521         val = readl(keypad->base + SAMSUNG_KEYIFCON);
 522         if (enable) {
 523                 val |= SAMSUNG_KEYIFCON_WAKEUPEN;
 524                 if (device_may_wakeup(&keypad->pdev->dev))
 525                         enable_irq_wake(keypad->irq);
 526         } else {
 527                 val &= ~SAMSUNG_KEYIFCON_WAKEUPEN;
 528                 if (device_may_wakeup(&keypad->pdev->dev))
 529                         disable_irq_wake(keypad->irq);
 530         }
 531         writel(val, keypad->base + SAMSUNG_KEYIFCON);
 532
 533         clk_disable(keypad->clk);
 534 }
 535
 536 static int samsung_keypad_suspend(struct device *dev)
 537 {
 538         struct platform_device *pdev = to_platform_device(dev);
 539         struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 540         struct input_dev *input_dev = keypad->input_dev;
 541
 542         mutex_lock(&input_dev->mutex);
 543
 544         if (input_dev->users)
 545                 samsung_keypad_stop(keypad);
 546
 547         samsung_keypad_toggle_wakeup(keypad, true);
 548
 549         mutex_unlock(&input_dev->mutex);
 550
 551         return 0;
 552 }
 553
 554 static int samsung_keypad_resume(struct device *dev)
 555 {
 556         struct platform_device *pdev = to_platform_device(dev);
 557         struct samsung_keypad *keypad = platform_get_drvdata(pdev);
 558         struct input_dev *input_dev = keypad->input_dev;
 559
 560         mutex_lock(&input_dev->mutex);
 561
 562         samsung_keypad_toggle_wakeup(keypad, false);
 563
 564         if (input_dev->users)
 565                 samsung_keypad_start(keypad);
 566
 567         mutex_unlock(&input_dev->mutex);
 568
 569         return 0;
 570 }
 571 #endif
 572
 573 static const struct dev_pm_ops samsung_keypad_pm_ops = {
 574         SET_SYSTEM_SLEEP_PM_OPS(samsung_keypad_suspend, samsung_keypad_resume)
 575         SET_RUNTIME_PM_OPS(samsung_keypad_runtime_suspend,
 576                            samsung_keypad_runtime_resume, NULL)
 577 };
 578
 579 #ifdef CONFIG_OF
 580 static const struct of_device_id samsung_keypad_dt_match[] = {
 581         { .compatible = "samsung,s3c6410-keypad" },
 582         { .compatible = "samsung,s5pv210-keypad" },
 583         {},
 584 };
 585 MODULE_DEVICE_TABLE(of, samsung_keypad_dt_match);
 586 #endif
 587
 588 static struct platform_device_id samsung_keypad_driver_ids[] = {
 589         {
 590                 .name           = "samsung-keypad",
 591                 .driver_data    = KEYPAD_TYPE_SAMSUNG,
 592         }, {
 593                 .name           = "s5pv210-keypad",
 594                 .driver_data    = KEYPAD_TYPE_S5PV210,
 595         },
 596         { },
 597 };
 598 MODULE_DEVICE_TABLE(platform, samsung_keypad_driver_ids);
 599
 600 static struct platform_driver samsung_keypad_driver = {
 601         .probe          = samsung_keypad_probe,
 602         .remove         = samsung_keypad_remove,
 603         .driver         = {
 604                 .name   = "samsung-keypad",
 605                 .of_match_table = of_match_ptr(samsung_keypad_dt_match),
 606                 .pm     = &samsung_keypad_pm_ops,
 607         },
 608         .id_table       = samsung_keypad_driver_ids,
 609 };
 610 module_platform_driver(samsung_keypad_driver);
 611
 612 MODULE_DESCRIPTION("Samsung keypad driver");
 613 MODULE_AUTHOR("Joonyoung Shim <jy0922.shim@samsung.com>");
 614 MODULE_AUTHOR("Donghwa Lee <dh09.lee@samsung.com>");
 615 MODULE_LICENSE("GPL");