git.oblomov.eu Git - linux-2.6/blob - drivers/input/keyboard/omap-keypad.c

   1 /*
   2  * linux/drivers/input/keyboard/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  * This program is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU General Public License as published by
  14  * the Free Software Foundation; either version 2 of the License, or
  15  * (at your option) any later version.
  16  *
  17  * This program is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  20  * GNU General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with this program; if not, write to the Free Software
  24  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/init.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/types.h>
  31 #include <linux/input.h>
  32 #include <linux/kernel.h>
  33 #include <linux/delay.h>
  34 #include <linux/platform_device.h>
  35 #include <linux/mutex.h>
  36 #include <linux/errno.h>
  37 #include <mach/gpio.h>
  38 #include <mach/keypad.h>
  39 #include <mach/menelaus.h>
  40 #include <asm/irq.h>
  41 #include <mach/hardware.h>
  42 #include <asm/io.h>
  43 #include <mach/mux.h>
  44
  45 #undef NEW_BOARD_LEARNING_MODE
  46
  47 static void omap_kp_tasklet(unsigned long);
  48 static void omap_kp_timer(unsigned long);
  49
  50 static unsigned char keypad_state[8];
  51 static DEFINE_MUTEX(kp_enable_mutex);
  52 static int kp_enable = 1;
  53 static int kp_cur_group = -1;
  54
  55 struct omap_kp {
  56         struct input_dev *input;
  57         struct timer_list timer;
  58         int irq;
  59         unsigned int rows;
  60         unsigned int cols;
  61         unsigned long delay;
  62         unsigned int debounce;
  63 };
  64
  65 DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);
  66
  67 static int *keymap;
  68 static unsigned int *row_gpios;
  69 static unsigned int *col_gpios;
  70
  71 #ifdef CONFIG_ARCH_OMAP2
  72 static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value)
  73 {
  74         int col;
  75         for (col = 0; col < omap_kp->cols; col++) {
  76                 if (value & (1 << col))
  77                         omap_set_gpio_dataout(col_gpios[col], 1);
  78                 else
  79                         omap_set_gpio_dataout(col_gpios[col], 0);
  80         }
  81 }
  82
  83 static u8 get_row_gpio_val(struct omap_kp *omap_kp)
  84 {
  85         int row;
  86         u8 value = 0;
  87
  88         for (row = 0; row < omap_kp->rows; row++) {
  89                 if (omap_get_gpio_datain(row_gpios[row]))
  90                         value |= (1 << row);
  91         }
  92         return value;
  93 }
  94 #else
  95 #define         set_col_gpio_val(x, y)  do {} while (0)
  96 #define         get_row_gpio_val(x)     0
  97 #endif
  98
  99 static irqreturn_t omap_kp_interrupt(int irq, void *dev_id)
 100 {
 101         struct omap_kp *omap_kp = dev_id;
 102
 103         /* disable keyboard interrupt and schedule for handling */
 104         if (cpu_is_omap24xx()) {
 105                 int i;
 106                 for (i = 0; i < omap_kp->rows; i++)
 107                         disable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
 108         } else
 109                 /* disable keyboard interrupt and schedule for handling */
 110                 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 111
 112         tasklet_schedule(&kp_tasklet);
 113
 114         return IRQ_HANDLED;
 115 }
 116
 117 static void omap_kp_timer(unsigned long data)
 118 {
 119         tasklet_schedule(&kp_tasklet);
 120 }
 121
 122 static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
 123 {
 124         int col = 0;
 125
 126         /* read the keypad status */
 127         if (cpu_is_omap24xx()) {
 128                 int i;
 129                 for (i = 0; i < omap_kp->rows; i++)
 130                         disable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
 131
 132                 /* read the keypad status */
 133                 for (col = 0; col < omap_kp->cols; col++) {
 134                         set_col_gpio_val(omap_kp, ~(1 << col));
 135                         state[col] = ~(get_row_gpio_val(omap_kp)) & 0x3f;
 136                 }
 137                 set_col_gpio_val(omap_kp, 0);
 138
 139         } else {
 140                 /* disable keyboard interrupt and schedule for handling */
 141                 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 142
 143                 /* read the keypad status */
 144                 omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
 145                 for (col = 0; col < omap_kp->cols; col++) {
 146                         omap_writew(~(1 << col) & 0xff,
 147                                     OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
 148
 149                         udelay(omap_kp->delay);
 150
 151                         state[col] = ~omap_readw(OMAP_MPUIO_BASE +
 152                                                  OMAP_MPUIO_KBR_LATCH) & 0xff;
 153                 }
 154                 omap_writew(0x00, OMAP_MPUIO_BASE + OMAP_MPUIO_KBC);
 155                 udelay(2);
 156         }
 157 }
 158
 159 static inline int omap_kp_find_key(int col, int row)
 160 {
 161         int i, key;
 162
 163         key = KEY(col, row, 0);
 164         for (i = 0; keymap[i] != 0; i++)
 165                 if ((keymap[i] & 0xff000000) == key)
 166                         return keymap[i] & 0x00ffffff;
 167         return -1;
 168 }
 169
 170 static void omap_kp_tasklet(unsigned long data)
 171 {
 172         struct omap_kp *omap_kp_data = (struct omap_kp *) data;
 173         unsigned char new_state[8], changed, key_down = 0;
 174         int col, row;
 175         int spurious = 0;
 176
 177         /* check for any changes */
 178         omap_kp_scan_keypad(omap_kp_data, new_state);
 179
 180         /* check for changes and print those */
 181         for (col = 0; col < omap_kp_data->cols; col++) {
 182                 changed = new_state[col] ^ keypad_state[col];
 183                 key_down |= new_state[col];
 184                 if (changed == 0)
 185                         continue;
 186
 187                 for (row = 0; row < omap_kp_data->rows; row++) {
 188                         int key;
 189                         if (!(changed & (1 << row)))
 190                                 continue;
 191 #ifdef NEW_BOARD_LEARNING_MODE
 192                         printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
 193                                row, (new_state[col] & (1 << row)) ?
 194                                "pressed" : "released");
 195 #else
 196                         key = omap_kp_find_key(col, row);
 197                         if (key < 0) {
 198                                 printk(KERN_WARNING
 199                                       "omap-keypad: Spurious key event %d-%d\n",
 200                                        col, row);
 201                                 /* We scan again after a couple of seconds */
 202                                 spurious = 1;
 203                                 continue;
 204                         }
 205
 206                         if (!(kp_cur_group == (key & GROUP_MASK) ||
 207                               kp_cur_group == -1))
 208                                 continue;
 209
 210                         kp_cur_group = key & GROUP_MASK;
 211                         input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
 212                                          new_state[col] & (1 << row));
 213 #endif
 214                 }
 215         }
 216         memcpy(keypad_state, new_state, sizeof(keypad_state));
 217
 218         if (key_down) {
 219                 int delay = HZ / 20;
 220                 /* some key is pressed - keep irq disabled and use timer
 221                  * to poll the keypad */
 222                 if (spurious)
 223                         delay = 2 * HZ;
 224                 mod_timer(&omap_kp_data->timer, jiffies + delay);
 225         } else {
 226                 /* enable interrupts */
 227                 if (cpu_is_omap24xx()) {
 228                         int i;
 229                         for (i = 0; i < omap_kp_data->rows; i++)
 230                                 enable_irq(OMAP_GPIO_IRQ(row_gpios[i]));
 231                 } else {
 232                         omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 233                         kp_cur_group = -1;
 234                 }
 235         }
 236 }
 237
 238 static ssize_t omap_kp_enable_show(struct device *dev,
 239                                    struct device_attribute *attr, char *buf)
 240 {
 241         return sprintf(buf, "%u\n", kp_enable);
 242 }
 243
 244 static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
 245                                     const char *buf, size_t count)
 246 {
 247         int state;
 248
 249         if (sscanf(buf, "%u", &state) != 1)
 250                 return -EINVAL;
 251
 252         if ((state != 1) && (state != 0))
 253                 return -EINVAL;
 254
 255         mutex_lock(&kp_enable_mutex);
 256         if (state != kp_enable) {
 257                 if (state)
 258                         enable_irq(INT_KEYBOARD);
 259                 else
 260                         disable_irq(INT_KEYBOARD);
 261                 kp_enable = state;
 262         }
 263         mutex_unlock(&kp_enable_mutex);
 264
 265         return strnlen(buf, count);
 266 }
 267
 268 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
 269
 270 #ifdef CONFIG_PM
 271 static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
 272 {
 273         /* Nothing yet */
 274
 275         return 0;
 276 }
 277
 278 static int omap_kp_resume(struct platform_device *dev)
 279 {
 280         /* Nothing yet */
 281
 282         return 0;
 283 }
 284 #else
 285 #define omap_kp_suspend NULL
 286 #define omap_kp_resume  NULL
 287 #endif
 288
 289 static int __init omap_kp_probe(struct platform_device *pdev)
 290 {
 291         struct omap_kp *omap_kp;
 292         struct input_dev *input_dev;
 293         struct omap_kp_platform_data *pdata =  pdev->dev.platform_data;
 294         int i, col_idx, row_idx, irq_idx, ret;
 295
 296         if (!pdata->rows || !pdata->cols || !pdata->keymap) {
 297                 printk(KERN_ERR "No rows, cols or keymap from pdata\n");
 298                 return -EINVAL;
 299         }
 300
 301         omap_kp = kzalloc(sizeof(struct omap_kp), GFP_KERNEL);
 302         input_dev = input_allocate_device();
 303         if (!omap_kp || !input_dev) {
 304                 kfree(omap_kp);
 305                 input_free_device(input_dev);
 306                 return -ENOMEM;
 307         }
 308
 309         platform_set_drvdata(pdev, omap_kp);
 310
 311         omap_kp->input = input_dev;
 312
 313         /* Disable the interrupt for the MPUIO keyboard */
 314         if (!cpu_is_omap24xx())
 315                 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 316
 317         keymap = pdata->keymap;
 318
 319         if (pdata->rep)
 320                 __set_bit(EV_REP, input_dev->evbit);
 321
 322         if (pdata->delay)
 323                 omap_kp->delay = pdata->delay;
 324
 325         if (pdata->row_gpios && pdata->col_gpios) {
 326                 row_gpios = pdata->row_gpios;
 327                 col_gpios = pdata->col_gpios;
 328         }
 329
 330         omap_kp->rows = pdata->rows;
 331         omap_kp->cols = pdata->cols;
 332
 333         if (cpu_is_omap24xx()) {
 334                 /* Cols: outputs */
 335                 for (col_idx = 0; col_idx < omap_kp->cols; col_idx++) {
 336                         if (omap_request_gpio(col_gpios[col_idx]) < 0) {
 337                                 printk(KERN_ERR "Failed to request"
 338                                        "GPIO%d for keypad\n",
 339                                        col_gpios[col_idx]);
 340                                 goto err1;
 341                         }
 342                         omap_set_gpio_direction(col_gpios[col_idx], 0);
 343                 }
 344                 /* Rows: inputs */
 345                 for (row_idx = 0; row_idx < omap_kp->rows; row_idx++) {
 346                         if (omap_request_gpio(row_gpios[row_idx]) < 0) {
 347                                 printk(KERN_ERR "Failed to request"
 348                                        "GPIO%d for keypad\n",
 349                                        row_gpios[row_idx]);
 350                                 goto err2;
 351                         }
 352                         omap_set_gpio_direction(row_gpios[row_idx], 1);
 353                 }
 354         } else {
 355                 col_idx = 0;
 356                 row_idx = 0;
 357         }
 358
 359         setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);
 360
 361         /* get the irq and init timer*/
 362         tasklet_enable(&kp_tasklet);
 363         kp_tasklet.data = (unsigned long) omap_kp;
 364
 365         ret = device_create_file(&pdev->dev, &dev_attr_enable);
 366         if (ret < 0)
 367                 goto err2;
 368
 369         /* setup input device */
 370         __set_bit(EV_KEY, input_dev->evbit);
 371         for (i = 0; keymap[i] != 0; i++)
 372                 __set_bit(keymap[i] & KEY_MAX, input_dev->keybit);
 373         input_dev->name = "omap-keypad";
 374         input_dev->phys = "omap-keypad/input0";
 375         input_dev->dev.parent = &pdev->dev;
 376
 377         input_dev->id.bustype = BUS_HOST;
 378         input_dev->id.vendor = 0x0001;
 379         input_dev->id.product = 0x0001;
 380         input_dev->id.version = 0x0100;
 381
 382         ret = input_register_device(omap_kp->input);
 383         if (ret < 0) {
 384                 printk(KERN_ERR "Unable to register omap-keypad input device\n");
 385                 goto err3;
 386         }
 387
 388         if (pdata->dbounce)
 389                 omap_writew(0xff, OMAP_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
 390
 391         /* scan current status and enable interrupt */
 392         omap_kp_scan_keypad(omap_kp, keypad_state);
 393         if (!cpu_is_omap24xx()) {
 394                 omap_kp->irq = platform_get_irq(pdev, 0);
 395                 if (omap_kp->irq >= 0) {
 396                         if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
 397                                         "omap-keypad", omap_kp) < 0)
 398                                 goto err4;
 399                 }
 400                 omap_writew(0, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 401         } else {
 402                 for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) {
 403                         if (request_irq(OMAP_GPIO_IRQ(row_gpios[irq_idx]),
 404                                         omap_kp_interrupt,
 405                                         IRQF_TRIGGER_FALLING,
 406                                         "omap-keypad", omap_kp) < 0)
 407                                 goto err5;
 408                 }
 409         }
 410         return 0;
 411 err5:
 412         for (i = irq_idx - 1; i >=0; i--)
 413                 free_irq(row_gpios[i], 0);
 414 err4:
 415         input_unregister_device(omap_kp->input);
 416         input_dev = NULL;
 417 err3:
 418         device_remove_file(&pdev->dev, &dev_attr_enable);
 419 err2:
 420         for (i = row_idx - 1; i >=0; i--)
 421                 omap_free_gpio(row_gpios[i]);
 422 err1:
 423         for (i = col_idx - 1; i >=0; i--)
 424                 omap_free_gpio(col_gpios[i]);
 425
 426         kfree(omap_kp);
 427         input_free_device(input_dev);
 428
 429         return -EINVAL;
 430 }
 431
 432 static int omap_kp_remove(struct platform_device *pdev)
 433 {
 434         struct omap_kp *omap_kp = platform_get_drvdata(pdev);
 435
 436         /* disable keypad interrupt handling */
 437         tasklet_disable(&kp_tasklet);
 438         if (cpu_is_omap24xx()) {
 439                 int i;
 440                 for (i = 0; i < omap_kp->cols; i++)
 441                         omap_free_gpio(col_gpios[i]);
 442                 for (i = 0; i < omap_kp->rows; i++) {
 443                         omap_free_gpio(row_gpios[i]);
 444                         free_irq(OMAP_GPIO_IRQ(row_gpios[i]), 0);
 445                 }
 446         } else {
 447                 omap_writew(1, OMAP_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 448                 free_irq(omap_kp->irq, 0);
 449         }
 450
 451         del_timer_sync(&omap_kp->timer);
 452         tasklet_kill(&kp_tasklet);
 453
 454         /* unregister everything */
 455         input_unregister_device(omap_kp->input);
 456
 457         kfree(omap_kp);
 458
 459         return 0;
 460 }
 461
 462 static struct platform_driver omap_kp_driver = {
 463         .probe          = omap_kp_probe,
 464         .remove         = omap_kp_remove,
 465         .suspend        = omap_kp_suspend,
 466         .resume         = omap_kp_resume,
 467         .driver         = {
 468                 .name   = "omap-keypad",
 469                 .owner  = THIS_MODULE,
 470         },
 471 };
 472
 473 static int __devinit omap_kp_init(void)
 474 {
 475         printk(KERN_INFO "OMAP Keypad Driver\n");
 476         return platform_driver_register(&omap_kp_driver);
 477 }
 478
 479 static void __exit omap_kp_exit(void)
 480 {
 481         platform_driver_unregister(&omap_kp_driver);
 482 }
 483
 484 module_init(omap_kp_init);
 485 module_exit(omap_kp_exit);
 486
 487 MODULE_AUTHOR("Timo Teräs");
 488 MODULE_DESCRIPTION("OMAP Keypad Driver");
 489 MODULE_LICENSE("GPL");
 490 MODULE_ALIAS("platform:omap-keypad");