drivers/input/keyboard/pxa27x_keypad.c

   1 /*
   2  * linux/drivers/input/keyboard/pxa27x_keypad.c
   3  *
   4  * Driver for the pxa27x matrix keyboard controller.
   5  *
   6  * Created:     Feb 22, 2007
   7  * Author:      Rodolfo Giometti <giometti@linux.it>
   8  *
   9  * Based on a previous implementations by Kevin O'Connor
  10  * <kevin_at_koconnor.net> and Alex Osborne <bobofdoom@gmail.com> and
  11  * on some suggestions by Nicolas Pitre <nico@cam.org>.
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of the GNU General Public License version 2 as
  15  * published by the Free Software Foundation.
  16  */
  17
  18
  19 #include <linux/kernel.h>
  20 #include <linux/module.h>
  21 #include <linux/init.h>
  22 #include <linux/interrupt.h>
  23 #include <linux/input.h>
  24 #include <linux/device.h>
  25 #include <linux/platform_device.h>
  26 #include <linux/clk.h>
  27 #include <linux/err.h>
  28
  29 #include <asm/mach-types.h>
  30 #include <asm/mach/arch.h>
  31 #include <asm/mach/map.h>
  32
  33 #include <asm/arch/hardware.h>
  34 #include <asm/arch/pxa27x_keypad.h>
  35
  36 /*
  37  * Keypad Controller registers
  38  */
  39 #define KPC             0x0000 /* Keypad Control register */
  40 #define KPDK            0x0008 /* Keypad Direct Key register */
  41 #define KPREC           0x0010 /* Keypad Rotary Encoder register */
  42 #define KPMK            0x0018 /* Keypad Matrix Key register */
  43 #define KPAS            0x0020 /* Keypad Automatic Scan register */
  44
  45 /* Keypad Automatic Scan Multiple Key Presser register 0-3 */
  46 #define KPASMKP0        0x0028
  47 #define KPASMKP1        0x0030
  48 #define KPASMKP2        0x0038
  49 #define KPASMKP3        0x0040
  50 #define KPKDI           0x0048
  51
  52 /* bit definitions */
  53 #define KPC_MKRN(n)     ((((n) - 1) & 0x7) << 26) /* matrix key row number */
  54 #define KPC_MKCN(n)     ((((n) - 1) & 0x7) << 23) /* matrix key column number */
  55 #define KPC_DKN(n)      ((((n) - 1) & 0x7) << 6)  /* direct key number */
  56
  57 #define KPC_AS          (0x1 << 30)  /* Automatic Scan bit */
  58 #define KPC_ASACT       (0x1 << 29)  /* Automatic Scan on Activity */
  59 #define KPC_MI          (0x1 << 22)  /* Matrix interrupt bit */
  60 #define KPC_IMKP        (0x1 << 21)  /* Ignore Multiple Key Press */
  61
  62 #define KPC_MS(n)       (0x1 << (13 + (n)))     /* Matrix scan line 'n' */
  63 #define KPC_MS_ALL      (0xff << 13)
  64
  65 #define KPC_ME          (0x1 << 12)  /* Matrix Keypad Enable */
  66 #define KPC_MIE         (0x1 << 11)  /* Matrix Interrupt Enable */
  67 #define KPC_DK_DEB_SEL  (0x1 <<  9)  /* Direct Keypad Debounce Select */
  68 #define KPC_DI          (0x1 <<  5)  /* Direct key interrupt bit */
  69 #define KPC_RE_ZERO_DEB (0x1 <<  4)  /* Rotary Encoder Zero Debounce */
  70 #define KPC_REE1        (0x1 <<  3)  /* Rotary Encoder1 Enable */
  71 #define KPC_REE0        (0x1 <<  2)  /* Rotary Encoder0 Enable */
  72 #define KPC_DE          (0x1 <<  1)  /* Direct Keypad Enable */
  73 #define KPC_DIE         (0x1 <<  0)  /* Direct Keypad interrupt Enable */
  74
  75 #define KPDK_DKP        (0x1 << 31)
  76 #define KPDK_DK(n)      ((n) & 0xff)
  77
  78 #define KPREC_OF1       (0x1 << 31)
  79 #define kPREC_UF1       (0x1 << 30)
  80 #define KPREC_OF0       (0x1 << 15)
  81 #define KPREC_UF0       (0x1 << 14)
  82
  83 #define KPREC_RECOUNT0(n)       ((n) & 0xff)
  84 #define KPREC_RECOUNT1(n)       (((n) >> 16) & 0xff)
  85
  86 #define KPMK_MKP        (0x1 << 31)
  87 #define KPAS_SO         (0x1 << 31)
  88 #define KPASMKPx_SO     (0x1 << 31)
  89
  90 #define KPAS_MUKP(n)    (((n) >> 26) & 0x1f)
  91 #define KPAS_RP(n)      (((n) >> 4) & 0xf)
  92 #define KPAS_CP(n)      ((n) & 0xf)
  93
  94 #define KPASMKP_MKC_MASK        (0xff)
  95
  96 #define keypad_readl(off)       __raw_readl(keypad->mmio_base + (off))
  97 #define keypad_writel(off, v)   __raw_writel((v), keypad->mmio_base + (off))
  98
  99 #define MAX_MATRIX_KEY_NUM      (8 * 8)
 100
 101 struct pxa27x_keypad {
 102         struct pxa27x_keypad_platform_data *pdata;
 103
 104         struct clk *clk;
 105         struct input_dev *input_dev;
 106         void __iomem *mmio_base;
 107
 108         int irq;
 109
 110         /* matrix key code map */
 111         unsigned int matrix_keycodes[MAX_MATRIX_KEY_NUM];
 112
 113         /* state row bits of each column scan */
 114         uint32_t matrix_key_state[MAX_MATRIX_KEY_COLS];
 115         uint32_t direct_key_state;
 116
 117         unsigned int direct_key_mask;
 118
 119         int rotary_rel_code[2];
 120         int rotary_up_key[2];
 121         int rotary_down_key[2];
 122 };
 123
 124 static void pxa27x_keypad_build_keycode(struct pxa27x_keypad *keypad)
 125 {
 126         struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
 127         struct input_dev *input_dev = keypad->input_dev;
 128         unsigned int *key;
 129         int i;
 130
 131         key = &pdata->matrix_key_map[0];
 132         for (i = 0; i < pdata->matrix_key_map_size; i++, key++) {
 133                 int row = ((*key) >> 28) & 0xf;
 134                 int col = ((*key) >> 24) & 0xf;
 135                 int code = (*key) & 0xffffff;
 136
 137                 keypad->matrix_keycodes[(row << 3) + col] = code;
 138                 set_bit(code, input_dev->keybit);
 139         }
 140
 141         for (i = 0; i < pdata->direct_key_num; i++)
 142                 set_bit(pdata->direct_key_map[i], input_dev->keybit);
 143
 144         keypad->rotary_up_key[0] = pdata->rotary0_up_key;
 145         keypad->rotary_up_key[1] = pdata->rotary1_up_key;
 146         keypad->rotary_down_key[0] = pdata->rotary0_down_key;
 147         keypad->rotary_down_key[1] = pdata->rotary1_down_key;
 148         keypad->rotary_rel_code[0] = pdata->rotary0_rel_code;
 149         keypad->rotary_rel_code[1] = pdata->rotary1_rel_code;
 150
 151         if (pdata->enable_rotary0) {
 152                 if (pdata->rotary0_up_key && pdata->rotary0_down_key) {
 153                         set_bit(pdata->rotary0_up_key, input_dev->keybit);
 154                         set_bit(pdata->rotary0_down_key, input_dev->keybit);
 155                 } else
 156                         set_bit(pdata->rotary0_rel_code, input_dev->relbit);
 157         }
 158
 159         if (pdata->enable_rotary1) {
 160                 if (pdata->rotary1_up_key && pdata->rotary1_down_key) {
 161                         set_bit(pdata->rotary1_up_key, input_dev->keybit);
 162                         set_bit(pdata->rotary1_down_key, input_dev->keybit);
 163                 } else
 164                         set_bit(pdata->rotary1_rel_code, input_dev->relbit);
 165         }
 166 }
 167
 168 static inline unsigned int lookup_matrix_keycode(
 169                 struct pxa27x_keypad *keypad, int row, int col)
 170 {
 171         return keypad->matrix_keycodes[(row << 3) + col];
 172 }
 173
 174 static void pxa27x_keypad_scan_matrix(struct pxa27x_keypad *keypad)
 175 {
 176         struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
 177         int row, col, num_keys_pressed = 0;
 178         uint32_t new_state[MAX_MATRIX_KEY_COLS];
 179         uint32_t kpas = keypad_readl(KPAS);
 180
 181         num_keys_pressed = KPAS_MUKP(kpas);
 182
 183         memset(new_state, 0, sizeof(new_state));
 184
 185         if (num_keys_pressed == 0)
 186                 goto scan;
 187
 188         if (num_keys_pressed == 1) {
 189                 col = KPAS_CP(kpas);
 190                 row = KPAS_RP(kpas);
 191
 192                 /* if invalid row/col, treat as no key pressed */
 193                 if (col >= pdata->matrix_key_cols ||
 194                     row >= pdata->matrix_key_rows)
 195                         goto scan;
 196
 197                 new_state[col] = (1 << row);
 198                 goto scan;
 199         }
 200
 201         if (num_keys_pressed > 1) {
 202                 uint32_t kpasmkp0 = keypad_readl(KPASMKP0);
 203                 uint32_t kpasmkp1 = keypad_readl(KPASMKP1);
 204                 uint32_t kpasmkp2 = keypad_readl(KPASMKP2);
 205                 uint32_t kpasmkp3 = keypad_readl(KPASMKP3);
 206
 207                 new_state[0] = kpasmkp0 & KPASMKP_MKC_MASK;
 208                 new_state[1] = (kpasmkp0 >> 16) & KPASMKP_MKC_MASK;
 209                 new_state[2] = kpasmkp1 & KPASMKP_MKC_MASK;
 210                 new_state[3] = (kpasmkp1 >> 16) & KPASMKP_MKC_MASK;
 211                 new_state[4] = kpasmkp2 & KPASMKP_MKC_MASK;
 212                 new_state[5] = (kpasmkp2 >> 16) & KPASMKP_MKC_MASK;
 213                 new_state[6] = kpasmkp3 & KPASMKP_MKC_MASK;
 214                 new_state[7] = (kpasmkp3 >> 16) & KPASMKP_MKC_MASK;
 215         }
 216 scan:
 217         for (col = 0; col < pdata->matrix_key_cols; col++) {
 218                 uint32_t bits_changed;
 219
 220                 bits_changed = keypad->matrix_key_state[col] ^ new_state[col];
 221                 if (bits_changed == 0)
 222                         continue;
 223
 224                 for (row = 0; row < pdata->matrix_key_rows; row++) {
 225                         if ((bits_changed & (1 << row)) == 0)
 226                                 continue;
 227
 228                         input_report_key(keypad->input_dev,
 229                                 lookup_matrix_keycode(keypad, row, col),
 230                                 new_state[col] & (1 << row));
 231                 }
 232         }
 233         input_sync(keypad->input_dev);
 234         memcpy(keypad->matrix_key_state, new_state, sizeof(new_state));
 235 }
 236
 237 #define DEFAULT_KPREC   (0x007f007f)
 238
 239 static inline int rotary_delta(uint32_t kprec)
 240 {
 241         if (kprec & KPREC_OF0)
 242                 return (kprec & 0xff) + 0x7f;
 243         else if (kprec & KPREC_UF0)
 244                 return (kprec & 0xff) - 0x7f - 0xff;
 245         else
 246                 return (kprec & 0xff) - 0x7f;
 247 }
 248
 249 static void report_rotary_event(struct pxa27x_keypad *keypad, int r, int delta)
 250 {
 251         struct input_dev *dev = keypad->input_dev;
 252
 253         if (delta == 0)
 254                 return;
 255
 256         if (keypad->rotary_up_key[r] && keypad->rotary_down_key[r]) {
 257                 int keycode = (delta > 0) ? keypad->rotary_up_key[r] :
 258                                             keypad->rotary_down_key[r];
 259
 260                 /* simulate a press-n-release */
 261                 input_report_key(dev, keycode, 1);
 262                 input_sync(dev);
 263                 input_report_key(dev, keycode, 0);
 264                 input_sync(dev);
 265         } else {
 266                 input_report_rel(dev, keypad->rotary_rel_code[r], delta);
 267                 input_sync(dev);
 268         }
 269 }
 270
 271 static void pxa27x_keypad_scan_rotary(struct pxa27x_keypad *keypad)
 272 {
 273         struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
 274         uint32_t kprec;
 275
 276         /* read and reset to default count value */
 277         kprec = keypad_readl(KPREC);
 278         keypad_writel(KPREC, DEFAULT_KPREC);
 279
 280         if (pdata->enable_rotary0)
 281                 report_rotary_event(keypad, 0, rotary_delta(kprec));
 282
 283         if (pdata->enable_rotary1)
 284                 report_rotary_event(keypad, 1, rotary_delta(kprec >> 16));
 285 }
 286
 287 static void pxa27x_keypad_scan_direct(struct pxa27x_keypad *keypad)
 288 {
 289         struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
 290         unsigned int new_state;
 291         uint32_t kpdk, bits_changed;
 292         int i;
 293
 294         kpdk = keypad_readl(KPDK);
 295
 296         if (pdata->enable_rotary0 || pdata->enable_rotary1)
 297                 pxa27x_keypad_scan_rotary(keypad);
 298
 299         if (pdata->direct_key_map == NULL)
 300                 return;
 301
 302         new_state = KPDK_DK(kpdk) & keypad->direct_key_mask;
 303         bits_changed = keypad->direct_key_state ^ new_state;
 304
 305         if (bits_changed == 0)
 306                 return;
 307
 308         for (i = 0; i < pdata->direct_key_num; i++) {
 309                 if (bits_changed & (1 << i))
 310                         input_report_key(keypad->input_dev,
 311                                         pdata->direct_key_map[i],
 312                                         (new_state & (1 << i)));
 313         }
 314         input_sync(keypad->input_dev);
 315         keypad->direct_key_state = new_state;
 316 }
 317
 318 static irqreturn_t pxa27x_keypad_irq_handler(int irq, void *dev_id)
 319 {
 320         struct pxa27x_keypad *keypad = dev_id;
 321         unsigned long kpc = keypad_readl(KPC);
 322
 323         if (kpc & KPC_DI)
 324                 pxa27x_keypad_scan_direct(keypad);
 325
 326         if (kpc & KPC_MI)
 327                 pxa27x_keypad_scan_matrix(keypad);
 328
 329         return IRQ_HANDLED;
 330 }
 331
 332 static void pxa27x_keypad_config(struct pxa27x_keypad *keypad)
 333 {
 334         struct pxa27x_keypad_platform_data *pdata = keypad->pdata;
 335         unsigned int mask = 0, direct_key_num = 0;
 336         unsigned long kpc = 0;
 337
 338         /* enable matrix keys with automatic scan */
 339         if (pdata->matrix_key_rows && pdata->matrix_key_cols) {
 340                 kpc |= KPC_ASACT | KPC_MIE | KPC_ME | KPC_MS_ALL;
 341                 kpc |= KPC_MKRN(pdata->matrix_key_rows) |
 342                        KPC_MKCN(pdata->matrix_key_cols);
 343         }
 344
 345         /* enable rotary key, debounce interval same as direct keys */
 346         if (pdata->enable_rotary0) {
 347                 mask |= 0x03;
 348                 direct_key_num = 2;
 349                 kpc |= KPC_REE0;
 350         }
 351
 352         if (pdata->enable_rotary1) {
 353                 mask |= 0x0c;
 354                 direct_key_num = 4;
 355                 kpc |= KPC_REE1;
 356         }
 357
 358         if (pdata->direct_key_num > direct_key_num)
 359                 direct_key_num = pdata->direct_key_num;
 360
 361         keypad->direct_key_mask = ((2 << direct_key_num) - 1) & ~mask;
 362
 363         /* enable direct key */
 364         if (direct_key_num)
 365                 kpc |= KPC_DE | KPC_DIE | KPC_DKN(direct_key_num);
 366
 367         keypad_writel(KPC, kpc | KPC_RE_ZERO_DEB);
 368         keypad_writel(KPREC, DEFAULT_KPREC);
 369         keypad_writel(KPKDI, pdata->debounce_interval);
 370 }
 371
 372 static int pxa27x_keypad_open(struct input_dev *dev)
 373 {
 374         struct pxa27x_keypad *keypad = input_get_drvdata(dev);
 375
 376         /* Enable unit clock */
 377         clk_enable(keypad->clk);
 378         pxa27x_keypad_config(keypad);
 379
 380         return 0;
 381 }
 382
 383 static void pxa27x_keypad_close(struct input_dev *dev)
 384 {
 385         struct pxa27x_keypad *keypad = input_get_drvdata(dev);
 386
 387         /* Disable clock unit */
 388         clk_disable(keypad->clk);
 389 }
 390
 391 #ifdef CONFIG_PM
 392 static int pxa27x_keypad_suspend(struct platform_device *pdev, pm_message_t state)
 393 {
 394         struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
 395
 396         clk_disable(keypad->clk);
 397
 398         if (device_may_wakeup(&pdev->dev))
 399                 enable_irq_wake(keypad->irq);
 400
 401         return 0;
 402 }
 403
 404 static int pxa27x_keypad_resume(struct platform_device *pdev)
 405 {
 406         struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
 407         struct input_dev *input_dev = keypad->input_dev;
 408
 409         if (device_may_wakeup(&pdev->dev))
 410                 disable_irq_wake(keypad->irq);
 411
 412         mutex_lock(&input_dev->mutex);
 413
 414         if (input_dev->users) {
 415                 /* Enable unit clock */
 416                 clk_enable(keypad->clk);
 417                 pxa27x_keypad_config(keypad);
 418         }
 419
 420         mutex_unlock(&input_dev->mutex);
 421
 422         return 0;
 423 }
 424 #else
 425 #define pxa27x_keypad_suspend   NULL
 426 #define pxa27x_keypad_resume    NULL
 427 #endif
 428
 429 #define res_size(res)   ((res)->end - (res)->start + 1)
 430
 431 static int __devinit pxa27x_keypad_probe(struct platform_device *pdev)
 432 {
 433         struct pxa27x_keypad *keypad;
 434         struct input_dev *input_dev;
 435         struct resource *res;
 436         int irq, error;
 437
 438         keypad = kzalloc(sizeof(struct pxa27x_keypad), GFP_KERNEL);
 439         if (keypad == NULL) {
 440                 dev_err(&pdev->dev, "failed to allocate driver data\n");
 441                 return -ENOMEM;
 442         }
 443
 444         keypad->pdata = pdev->dev.platform_data;
 445         if (keypad->pdata == NULL) {
 446                 dev_err(&pdev->dev, "no platform data defined\n");
 447                 error = -EINVAL;
 448                 goto failed_free;
 449         }
 450
 451         irq = platform_get_irq(pdev, 0);
 452         if (irq < 0) {
 453                 dev_err(&pdev->dev, "failed to get keypad irq\n");
 454                 error = -ENXIO;
 455                 goto failed_free;
 456         }
 457
 458         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 459         if (res == NULL) {
 460                 dev_err(&pdev->dev, "failed to get I/O memory\n");
 461                 error = -ENXIO;
 462                 goto failed_free;
 463         }
 464
 465         res = request_mem_region(res->start, res_size(res), pdev->name);
 466         if (res == NULL) {
 467                 dev_err(&pdev->dev, "failed to request I/O memory\n");
 468                 error = -EBUSY;
 469                 goto failed_free;
 470         }
 471
 472         keypad->mmio_base = ioremap(res->start, res_size(res));
 473         if (keypad->mmio_base == NULL) {
 474                 dev_err(&pdev->dev, "failed to remap I/O memory\n");
 475                 error = -ENXIO;
 476                 goto failed_free_mem;
 477         }
 478
 479         keypad->clk = clk_get(&pdev->dev, "KBDCLK");
 480         if (IS_ERR(keypad->clk)) {
 481                 dev_err(&pdev->dev, "failed to get keypad clock\n");
 482                 error = PTR_ERR(keypad->clk);
 483                 goto failed_free_io;
 484         }
 485
 486         /* Create and register the input driver. */
 487         input_dev = input_allocate_device();
 488         if (!input_dev) {
 489                 dev_err(&pdev->dev, "failed to allocate input device\n");
 490                 error = -ENOMEM;
 491                 goto failed_put_clk;
 492         }
 493
 494         input_dev->name = pdev->name;
 495         input_dev->id.bustype = BUS_HOST;
 496         input_dev->open = pxa27x_keypad_open;
 497         input_dev->close = pxa27x_keypad_close;
 498         input_dev->dev.parent = &pdev->dev;
 499
 500         keypad->input_dev = input_dev;
 501         input_set_drvdata(input_dev, keypad);
 502
 503         input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
 504         if ((keypad->pdata->enable_rotary0 &&
 505                         keypad->pdata->rotary0_rel_code) ||
 506             (keypad->pdata->enable_rotary1 &&
 507                         keypad->pdata->rotary1_rel_code)) {
 508                 input_dev->evbit[0] |= BIT_MASK(EV_REL);
 509         }
 510
 511         pxa27x_keypad_build_keycode(keypad);
 512         platform_set_drvdata(pdev, keypad);
 513
 514         error = request_irq(irq, pxa27x_keypad_irq_handler, IRQF_DISABLED,
 515                             pdev->name, keypad);
 516         if (error) {
 517                 dev_err(&pdev->dev, "failed to request IRQ\n");
 518                 goto failed_free_dev;
 519         }
 520
 521         keypad->irq = irq;
 522
 523         /* Register the input device */
 524         error = input_register_device(input_dev);
 525         if (error) {
 526                 dev_err(&pdev->dev, "failed to register input device\n");
 527                 goto failed_free_irq;
 528         }
 529
 530         device_init_wakeup(&pdev->dev, 1);
 531
 532         return 0;
 533
 534 failed_free_irq:
 535         free_irq(irq, pdev);
 536         platform_set_drvdata(pdev, NULL);
 537 failed_free_dev:
 538         input_free_device(input_dev);
 539 failed_put_clk:
 540         clk_put(keypad->clk);
 541 failed_free_io:
 542         iounmap(keypad->mmio_base);
 543 failed_free_mem:
 544         release_mem_region(res->start, res_size(res));
 545 failed_free:
 546         kfree(keypad);
 547         return error;
 548 }
 549
 550 static int __devexit pxa27x_keypad_remove(struct platform_device *pdev)
 551 {
 552         struct pxa27x_keypad *keypad = platform_get_drvdata(pdev);
 553         struct resource *res;
 554
 555         free_irq(keypad->irq, pdev);
 556
 557         clk_disable(keypad->clk);
 558         clk_put(keypad->clk);
 559
 560         input_unregister_device(keypad->input_dev);
 561         input_free_device(keypad->input_dev);
 562
 563         iounmap(keypad->mmio_base);
 564
 565         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 566         release_mem_region(res->start, res_size(res));
 567
 568         platform_set_drvdata(pdev, NULL);
 569         kfree(keypad);
 570         return 0;
 571 }
 572
 573 /* work with hotplug and coldplug */
 574 MODULE_ALIAS("platform:pxa27x-keypad");
 575
 576 static struct platform_driver pxa27x_keypad_driver = {
 577         .probe          = pxa27x_keypad_probe,
 578         .remove         = __devexit_p(pxa27x_keypad_remove),
 579         .suspend        = pxa27x_keypad_suspend,
 580         .resume         = pxa27x_keypad_resume,
 581         .driver         = {
 582                 .name   = "pxa27x-keypad",
 583                 .owner  = THIS_MODULE,
 584         },
 585 };
 586
 587 static int __init pxa27x_keypad_init(void)
 588 {
 589         return platform_driver_register(&pxa27x_keypad_driver);
 590 }
 591
 592 static void __exit pxa27x_keypad_exit(void)
 593 {
 594         platform_driver_unregister(&pxa27x_keypad_driver);
 595 }
 596
 597 module_init(pxa27x_keypad_init);
 598 module_exit(pxa27x_keypad_exit);
 599
 600 MODULE_DESCRIPTION("PXA27x Keypad Controller Driver");
 601 MODULE_LICENSE("GPL");