drivers/input/keyboard/omap-keypad.c

   1 /*
   2  * linux/drivers/char/omap-keypad.c
   3  *
   4  * OMAP Keypad Driver
   5  *
   6  * Copyright (C) 2003 Nokia Corporation
   7  * Written by Timo Teräs <ext-timo.teras@nokia.com>
   8  *
   9  * Added support for H2 & H3 Keypad
  10  * Copyright (C) 2004 Texas Instruments
  11  *
  12  * Added support for keypad and joypad in HP iPAQ h63xx series of devices.
  13  * Copyright (C) 2005 Mika Laitio
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2 of the License, or
  18  * (at your option) any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program; if not, write to the Free Software
  27  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  28  */
  29
  30 #include <linux/module.h>
  31 #include <linux/init.h>
  32 #include <linux/interrupt.h>
  33 #include <linux/types.h>
  34 #include <linux/input.h>
  35 #include <linux/kernel.h>
  36 #include <linux/delay.h>
  37 #include <linux/platform_device.h>
  38 #include <linux/mutex.h>
  39 #include <asm/arch/irqs.h>
  40 #include <asm/arch/gpio.h>
  41 #include <asm/arch/hardware.h>
  42 #include <asm/arch/keypad.h>
  43 #include <asm/arch/menelaus.h>
  44 #include <asm/io.h>
  45 #include <asm/errno.h>
  46 #include <asm/mach-types.h>
  47 #include <asm/arch/mux.h>
  48
  49 #undef NEW_BOARD_LEARNING_MODE
  50 //#define NEW_BOARD_LEARNING_MODE 1
  51
  52 /*
  53  * Following 5 keypad events are not really sent to userspace.
  54  * Instead if the good combination of them is sent, then that is send.
  55  * (up, right, down, left, enter)
  56  */
  57 #define _H6300_JOYPAD_UP_RIGHT          1       // 00001
  58 #define _H6300_JOYPAD_DOWN_RIGHT        2       // 00010
  59 #define _h6300_JOYPAD_DOWN_LEFT         4       // 00100
  60 #define _h6300_JOYPAD_UP_LEFT           8       // 01000
  61 #define _H6300_JOYPAD_KEY_OK            16      // 10000
  62 #define _H6300_JOYPAD_REPORT_COLUMN     4
  63
  64 static void omap_kp_tasklet(unsigned long);
  65 static void omap_kp_timer(unsigned long);
  66
  67 static unsigned char keypad_state[8];
  68 static DEFINE_MUTEX(kp_enable_mutex);
  69 static int kp_enable = 1;
  70 static int kp_cur_group = -1;
  71
  72 static int prevJoypadKeycodePressEmulated;
  73
  74 struct omap_kp {
  75         struct input_dev *input;
  76         struct timer_list timer;
  77         int irq;
  78         unsigned int rows;
  79         unsigned int cols;
  80 };
  81
  82 DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);
  83
  84 static int *keymap;
  85 static unsigned int *row_gpios;
  86 static unsigned int *col_gpios;
  87
  88 #ifdef CONFIG_ARCH_OMAP2
  89 static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value)
  90 {
  91         int col;
  92         for (col = 0; col < omap_kp->cols; col++) {
  93                 if (value & (1 << col))
  94                         omap_set_gpio_dataout(col_gpios[col], 1);
  95                 else
  96                         omap_set_gpio_dataout(col_gpios[col], 0);
  97         }
  98 }
  99
 100 static u8 get_row_gpio_val(struct omap_kp *omap_kp)
 101 {
 102         int row;
 103         u8 value = 0;
 104
 105         for (row = 0; row < omap_kp->rows; row++) {
 106                 if (omap_get_gpio_datain(row_gpios[row]))
 107                         value |= (1 << row);
 108         }
 109         return value;
 110 }
 111 #else
 112 #define         set_col_gpio_val(x, y)  do {} while (0)
 113 #define         get_row_gpio_val(x)     0
 114 #endif
 115
 116 static irqreturn_t omap_kp_interrupt(int irq, void *dev_id,
 117                                      struct pt_regs *regs)
 118 {
 119         struct omap_kp *omap_kp = dev_id;
 120
 121         /* disable keyboard interrupt and schedule for handling */
 122         if (cpu_is_omap24xx()) {
 123                 int i;
 124                 for (i = 0; i < omap_kp->rows; i++)
 125                         disable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
 126         } else {
 127                 /* disable keyboard interrupt and schedule for handling */
 128                 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 129         }
 130
 131         tasklet_schedule(&kp_tasklet);
 132
 133         return IRQ_HANDLED;
 134 }
 135
 136 static void omap_kp_timer(unsigned long data)
 137 {
 138         tasklet_schedule(&kp_tasklet);
 139 }
 140
 141 static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
 142 {
 143         int col = 0;
 144
 145         /* read the keypad status */
 146         if (cpu_is_omap24xx()) {
 147                 int i;
 148                 for (i = 0; i < omap_kp->rows; i++)
 149                         disable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
 150         } else {
 151                 /* disable keyboard interrupt and schedule for handling */
 152                 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 153         }
 154         if (!cpu_is_omap24xx()) {
 155                 /* read the keypad status */
 156                 omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
 157                 for (col = 0; col < omap_kp->cols; col++) {
 158                         omap_writew(~(1 << col) & 0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
 159
 160                         if (machine_is_omap_osk() || machine_is_omap_h2() || machine_is_omap_h3() || machine_is_omap_h6300()) {
 161                                 udelay(9);
 162                         } else {
 163                                 udelay(4);
 164                         }
 165                         state[col] = ~omap_readw(OMAP_MPUIO_BASE + OMAP_MPUIO_KBR_LATCH) & 0xff;
 166                 }
 167                 omap_writew(0x00, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
 168                 udelay(2);
 169         } else {
 170                 /* read the keypad status */
 171                 for (col = 0; col < omap_kp->cols; col++) {
 172                         set_col_gpio_val(omap_kp, ~(1 << col));
 173                         state[col] = ~(get_row_gpio_val(omap_kp)) & 0x3f;
 174                 }
 175                 set_col_gpio_val(omap_kp, 0);
 176         }
 177 }
 178
 179 static inline int omap_kp_find_key(int col, int row)
 180 {
 181         int i, key;
 182
 183         key = KEY(col, row, 0);
 184         for (i = 0; keymap[i] != 0; i++)
 185                 if ((keymap[i] & 0xff000000) == key)
 186                         return keymap[i] & 0x00ffffff;
 187         return -1;
 188 }
 189
 190 int is_key_down(unsigned char new_state[],
 191                 int col,
 192                 int row)
 193 {
 194         return (new_state[col] & (1 << row)) ? 1 : 0;
 195 }
 196
 197 static void omap_kp_tasklet(unsigned long data)
 198 {
 199         struct omap_kp *omap_kp_data = (struct omap_kp *) data;
 200         unsigned char new_state[8], changed, key_down = 0;
 201         int col, row;
 202         int spurious = 0;
 203         int report_key, report_col, report_row, joypad_checked; // h6300-joypad specific variables
 204
 205         /* check for any changes */
 206         omap_kp_scan_keypad(omap_kp_data, new_state);
 207
 208         /* check for changes and print those */
 209         joypad_checked  = 0;
 210         for (col = 0; col < omap_kp_data->cols; col++) {
 211                 changed = new_state[col] ^ keypad_state[col];
 212                 key_down |= new_state[col];
 213                 if (changed == 0)
 214                         continue;
 215
 216                 for (row = 0; row < omap_kp_data->rows; row++) {
 217                         int key;
 218                         if (!(changed & (1 << row)))
 219                                 continue;
 220 #ifdef NEW_BOARD_LEARNING_MODE
 221                         printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col, row, (new_state[col] & (1 << row)) ? "pressed" : "released");
 222 #else
 223                         key = omap_kp_find_key(col, row);
 224                         if (key < 0) {
 225                                 printk(KERN_WARNING "omap-keypad: Spurious key event %d-%d\n",
 226                                        col, row);
 227                                 /* We scan again after a couple of seconds */
 228                                 spurious = 1;
 229                                 continue;
 230                         }
 231                         if (machine_is_omap_h6300() &&
 232                            ((col == 1) || (col == _H6300_JOYPAD_REPORT_COLUMN)))
 233                         {
 234                                 if (col == _H6300_JOYPAD_REPORT_COLUMN)
 235                                 {
 236                                         continue;
 237                                 }
 238                                 if ((joypad_checked == 0) &&
 239                                     ((key == _H6300_JOYPAD_KEY_OK) ||
 240                                      (key == _h6300_JOYPAD_UP_LEFT) ||
 241                                      (key == _H6300_JOYPAD_UP_RIGHT) ||
 242                                      (key == _H6300_JOYPAD_DOWN_RIGHT) ||
 243                                      (key == _h6300_JOYPAD_DOWN_LEFT)))
 244                                 {
 245                                         if (is_key_down(new_state, col, row))
 246                                         {
 247                                                 /*
 248                                                  * only enter pressed
 249                                                  * 1 0 0 _H6300_JOYPAD_KEY_OK 0 0
 250                                                  * --> 100100 == 36
 251                                                  */
 252                                                  if (new_state[1] == 36)
 253                                                  {
 254                                                         joypad_checked  = 1;
 255                                                         prevJoypadKeycodePressEmulated  = KEY_ENTER;
 256                                                         new_state[_H6300_JOYPAD_REPORT_COLUMN]  = 48;   //110000
 257                                                         report_key      = prevJoypadKeycodePressEmulated;
 258                                                         report_col      = _H6300_JOYPAD_REPORT_COLUMN;
 259                                                         report_row      = 4;
 260                                                         input_report_key(omap_kp_data->input,
 261                                                                         report_key,
 262                                                                         new_state[report_col] & (1 << report_row));
 263                                                  }
 264                                                 /*
 265                                                  * enter, up_left and up_right sensors pressed.
 266                                                  * 1 _H6300_JOYPAD_UP_RIGHT 0 _H6300_JOYPAD_KEY_OK 0 _h6300_JOYPAD_UP_LEFT
 267                                                  * --> 110101 == 53
 268                                                  * OR
 269                                                  * 1 KEY_UP_RIGHT 0 0 0 _h6300_JOYPAD_UP_LEFT
 270                                                  * --> 110001 == 42
 271                                                  * --> move to up
 272                                                  */
 273                                                 else if ((new_state[1] == 53) ||
 274                                                          (new_state[1] == 49))
 275                                                 {
 276                                                         joypad_checked  = 1;
 277                                                         prevJoypadKeycodePressEmulated  = KEY_UP;
 278                                                         new_state[_H6300_JOYPAD_REPORT_COLUMN]  = 40;   //101000
 279                                                         report_key      = prevJoypadKeycodePressEmulated;
 280                                                         report_col      = _H6300_JOYPAD_REPORT_COLUMN;
 281                                                         report_row      = 3;
 282                                                         input_report_key(omap_kp_data->input,
 283                                                                         report_key,
 284                                                                         new_state[report_col] & (1 << report_row));
 285                                                 }
 286                                                 /*
 287                                                  * enter, down_left and down_right sensors pressed
 288                                                  * --> 101110 == 46
 289                                                  * OR
 290                                                  * down_left and down_right
 291                                                  * -->101010 == 42
 292                                                  * --> move to down
 293                                                  */
 294                                                 else if ((new_state[1] == 46) ||
 295                                                          (new_state[1] == 42))
 296                                                 {
 297                                                         joypad_checked  = 1;
 298                                                         prevJoypadKeycodePressEmulated  = KEY_DOWN;
 299                                                         new_state[_H6300_JOYPAD_REPORT_COLUMN]  = 34;   //100010
 300                                                         report_key      = prevJoypadKeycodePressEmulated;
 301                                                         report_col      = _H6300_JOYPAD_REPORT_COLUMN;
 302                                                         report_row      = 1;
 303                                                         input_report_key(omap_kp_data->input,
 304                                                                         report_key,
 305                                                                         new_state[report_col] & (1 << report_row));
 306                                                 }
 307                                                 /*
 308                                                  * enter, up_right and down_right sensors pressed
 309                                                  * --> 111100 == 60
 310                                                  * or
 311                                                  * down_right and up_right
 312                                                  * --> 111000 == 56
 313                                                  * --> move to right
 314                                                  */
 315                                                 else if ((new_state[1] == 60) ||
 316                                                          (new_state[1] == 56))
 317                                                 {
 318                                                         joypad_checked  = 1;
 319                                                         prevJoypadKeycodePressEmulated  = KEY_RIGHT;
 320                                                         new_state[_H6300_JOYPAD_REPORT_COLUMN]  = 33;   //100001
 321                                                         report_key      = prevJoypadKeycodePressEmulated;
 322                                                         report_col      = _H6300_JOYPAD_REPORT_COLUMN;
 323                                                         report_row      = 0;
 324                                                         input_report_key(omap_kp_data->input,
 325                                                                         report_key,
 326                                                                         new_state[report_col] & (1 << report_row));
 327                                                 }
 328                                                 /*
 329                                                  * enter, up_left and down_left sensors pressed
 330                                                  * --> 100111 == 39
 331                                                  * or up_left and down_left
 332                                                  * --> 100011 == 35
 333                                                  * --> move to left
 334                                                  */
 335                                                 else if ((new_state[1] == 39) ||
 336                                                          (new_state[1] == 35))
 337                                                 {
 338                                                         joypad_checked  = 1;
 339                                                         prevJoypadKeycodePressEmulated  = KEY_LEFT;
 340                                                         new_state[_H6300_JOYPAD_REPORT_COLUMN]  = 36;   //100100
 341                                                         report_key      = prevJoypadKeycodePressEmulated;
 342                                                         report_col      = _H6300_JOYPAD_REPORT_COLUMN;
 343                                                         report_row      = 2;
 344                                                         input_report_key(omap_kp_data->input,
 345                                                                         report_key,
 346                                                                         new_state[report_col] & (1 << report_row));
 347                                                 }
 348                                                 else
 349                                                 {
 350                                                         //printk("missed new_state = %d\n", new_state[1]);
 351                                                 }
 352                                         }
 353                                         else
 354                                         {
 355                                                 if (prevJoypadKeycodePressEmulated != 0)
 356                                                 {
 357                                                         // report key up event
 358                                                         joypad_checked  = 1;
 359                                                         new_state[_H6300_JOYPAD_REPORT_COLUMN]  = 32;   //100000
 360                                                         report_key      = prevJoypadKeycodePressEmulated;
 361                                                         report_col      = _H6300_JOYPAD_REPORT_COLUMN;
 362                                                         switch(prevJoypadKeycodePressEmulated)
 363                                                         {
 364                                                                 case KEY_RIGHT:
 365                                                                         report_row      = 0;
 366                                                                         break;
 367                                                                 case KEY_DOWN:
 368                                                                         report_row      = 1;
 369                                                                         break;
 370                                                                 case KEY_LEFT:
 371                                                                         report_row      = 2;
 372                                                                         break;
 373                                                                 case KEY_UP:
 374                                                                         report_row      = 3;
 375                                                                         break;
 376                                                                 case KEY_ENTER:
 377                                                                         report_row      = 4;
 378                                                                         break;
 379                                                                 default:
 380                                                                         printk(KERN_WARNING "Unknown iPAQ h6300 column 1 key = %d released. This should newer happen!\n",
 381                                                                                 key);
 382                                                                         report_row      = 0;
 383                                                         }
 384                                                         input_report_key(omap_kp_data->input,
 385                                                                         report_key,
 386                                                                         new_state[report_col] & (1 << report_row));
 387                                                         prevJoypadKeycodePressEmulated  = 0;
 388                                                 }
 389                                         }
 390                                 }
 391                         }
 392                         else
 393                         {
 394                                 if (!(kp_cur_group == (key & GROUP_MASK) ||
 395                                       kp_cur_group == -1))
 396                                         continue;
 397
 398                                 kp_cur_group = key & GROUP_MASK;
 399                                 input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
 400                                                  !!(new_state[col] & (1 << row)));
 401                         }
 402 #endif
 403                 }
 404         }
 405         memcpy(keypad_state, new_state, sizeof(keypad_state));
 406
 407         if (key_down) {
 408                 int delay = HZ / 20;
 409                 /* some key is pressed - keep irq disabled and use timer
 410                  * to poll the keypad */
 411                 if (spurious)
 412                         delay = 2 * HZ;
 413                 mod_timer(&omap_kp_data->timer, jiffies + delay);
 414         } else {
 415                 /* enable interrupts */
 416                 if (cpu_is_omap24xx()) {
 417                         int i;
 418                         for (i = 0; i < omap_kp_data->rows; i++)
 419                                 enable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
 420                 } else {
 421                         omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 422                         kp_cur_group = -1;
 423                 }
 424         }
 425 }
 426
 427 static ssize_t omap_kp_enable_show(struct device *dev,
 428                                    struct device_attribute *attr, char *buf)
 429 {
 430         return sprintf(buf, "%u\n", kp_enable);
 431 }
 432
 433 static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
 434                                     const char *buf, size_t count)
 435 {
 436         int state;
 437
 438         if (sscanf(buf, "%u", &state) != 1)
 439                 return -EINVAL;
 440
 441         if ((state != 1) && (state != 0))
 442                 return -EINVAL;
 443
 444         mutex_lock(&kp_enable_mutex);
 445         if (state != kp_enable) {
 446                 if (state)
 447                         enable_irq(INT_KEYBOARD);
 448                 else
 449                         disable_irq(INT_KEYBOARD);
 450                 kp_enable = state;
 451         }
 452         mutex_unlock(&kp_enable_mutex);
 453
 454         return strnlen(buf, count);
 455 }
 456
 457 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
 458
 459 #ifdef CONFIG_PM
 460 static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
 461 {
 462         /* Nothing yet */
 463
 464         return 0;
 465 }
 466
 467 static int omap_kp_resume(struct platform_device *dev)
 468 {
 469         /* Nothing yet */
 470
 471         return 0;
 472 }
 473 #else
 474 #define omap_kp_suspend NULL
 475 #define omap_kp_resume  NULL
 476 #endif
 477
 478 static int __init omap_kp_probe(struct platform_device *pdev)
 479 {
 480         struct omap_kp *omap_kp;
 481         struct input_dev *input_dev;
 482         struct omap_kp_platform_data *pdata =  pdev->dev.platform_data;
 483         int i;
 484
 485         if (!pdata->rows || !pdata->cols || !pdata->keymap) {
 486                 printk(KERN_ERR "No rows, cols or keymap from pdata\n");
 487                 return -EINVAL;
 488         }
 489
 490         omap_kp = kzalloc(sizeof(struct omap_kp), GFP_KERNEL);
 491         input_dev = input_allocate_device();
 492         if (!omap_kp || !input_dev) {
 493                 kfree(omap_kp);
 494                 input_free_device(input_dev);
 495                 return -ENOMEM;
 496         }
 497
 498         platform_set_drvdata(pdev, omap_kp);
 499
 500         omap_kp->input = input_dev;
 501
 502         /* Disable the interrupt for the MPUIO keyboard */
 503         if (!cpu_is_omap24xx())
 504                 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 505
 506         keymap = pdata->keymap;
 507
 508         if (pdata->rep)
 509                 set_bit(EV_REP, input_dev->evbit);
 510
 511         if (pdata->row_gpios && pdata->col_gpios) {
 512                 row_gpios = pdata->row_gpios;
 513                 col_gpios = pdata->col_gpios;
 514         }
 515
 516         omap_kp->rows = pdata->rows;
 517         omap_kp->cols = pdata->cols;
 518
 519         if (cpu_is_omap24xx()) {
 520                 /* Cols: outputs */
 521                 for (i = 0; i < omap_kp->cols; i++) {
 522                         if (omap_request_gpio(col_gpios[i]) < 0) {
 523                                 printk(KERN_ERR "Failed to request"
 524                                        "GPIO%d for keypad\n",
 525                                        col_gpios[i]);
 526                                 return -EINVAL;
 527                         }
 528                         omap_set_gpio_direction(col_gpios[i], 0);
 529                 }
 530                 /* Rows: inputs */
 531                 for (i = 0; i < omap_kp->rows; i++) {
 532                         if (omap_request_gpio(row_gpios[i]) < 0) {
 533                                 printk(KERN_ERR "Failed to request"
 534                                        "GPIO%d for keypad\n",
 535                                        row_gpios[i]);
 536                                 return -EINVAL;
 537                         }
 538                         omap_set_gpio_direction(row_gpios[i], 1);
 539                 }
 540         }
 541         prevJoypadKeycodePressEmulated          = 0;
 542
 543         init_timer(&omap_kp->timer);
 544         omap_kp->timer.function = omap_kp_timer;
 545         omap_kp->timer.data = (unsigned long)omap_kp;
 546
 547         /* get the irq and init timer*/
 548         tasklet_enable(&kp_tasklet);
 549         kp_tasklet.data = (unsigned long) omap_kp;
 550
 551         omap_kp->irq = platform_get_irq(pdev, 0);
 552         if (omap_kp->irq >= 0) {
 553                 if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
 554                                 "omap-keypad", omap_kp) < 0)
 555                         return -EINVAL;
 556         }
 557
 558         device_create_file(&pdev->dev, &dev_attr_enable);
 559
 560         /* setup input device */
 561         set_bit(EV_KEY, input_dev->evbit);
 562         for (i = 0; keymap[i] != 0; i++)
 563                 set_bit(keymap[i] & KEY_MAX, input_dev->keybit);
 564         input_dev->name = "omap-keypad";
 565         input_dev->cdev.dev = &pdev->dev;
 566         input_dev->private = omap_kp;
 567         input_register_device(omap_kp->input);
 568
 569         if (machine_is_omap_h2() || machine_is_omap_h3() ||
 570             machine_is_omap_perseus2() || machine_is_omap_h6300()) {
 571                 omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
 572         }
 573         /* scan current status and enable interrupt */
 574         omap_kp_scan_keypad(omap_kp, keypad_state);
 575         if (!cpu_is_omap24xx()) {
 576                 omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 577         } else {
 578                 for (i = 0; i < omap_kp->rows; i++) {
 579                         if (request_irq(OMAP_GPIO_IRQ(row_gpios[i]), omap_kp_interrupt,
 580                                         SA_TRIGGER_FALLING, "omap-keypad", omap_kp) < 0)
 581                                 return -EINVAL;
 582                 }
 583         }
 584
 585         return 0;
 586 }
 587
 588 static int omap_kp_remove(struct platform_device *pdev)
 589 {
 590         struct omap_kp *omap_kp = platform_get_drvdata(pdev);
 591
 592         /* disable keypad interrupt handling */
 593         tasklet_disable(&kp_tasklet);
 594         if (cpu_is_omap24xx()) {
 595                 int i;
 596                 for (i = 0; i < omap_kp->cols; i++)
 597                         omap_free_gpio(col_gpios[i]);
 598                 for (i = 0; i < omap_kp->rows; i++) {
 599                         omap_free_gpio(row_gpios[i]);
 600                         free_irq(OMAP_GPIO_IRQ(row_gpios[i]), 0);
 601                 }
 602         } else {
 603                 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 604                 free_irq(omap_kp->irq, 0);
 605         }
 606
 607         del_timer_sync(&omap_kp->timer);
 608
 609         /* unregister everything */
 610         input_unregister_device(omap_kp->input);
 611
 612         kfree(omap_kp);
 613
 614         return 0;
 615 }
 616
 617 static struct platform_driver omap_kp_driver = {
 618         .probe          = omap_kp_probe,
 619         .remove         = omap_kp_remove,
 620         .suspend        = omap_kp_suspend,
 621         .resume         = omap_kp_resume,
 622         .driver         = {
 623                 .name   = "omap-keypad",
 624         },
 625 };
 626
 627 static int __devinit omap_kp_init(void)
 628 {
 629         printk(KERN_INFO "OMAP Keypad Driver\n");
 630         return platform_driver_register(&omap_kp_driver);
 631 }
 632
 633 static void __exit omap_kp_exit(void)
 634 {
 635         platform_driver_unregister(&omap_kp_driver);
 636 }
 637
 638 module_init(omap_kp_init);
 639 module_exit(omap_kp_exit);
 640
 641 MODULE_AUTHOR("Timo Teräs");
 642 MODULE_DESCRIPTION("OMAP Keypad Driver");
 643 MODULE_LICENSE("GPL");