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   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 <linux/slab.h>
  38 #include <mach/gpio.h>
  39 #include <plat/keypad.h>
  40 #include <plat/menelaus.h>
  41 #include <asm/irq.h>
  42 #include <mach/hardware.h>
  43 #include <asm/io.h>
  44 #include <plat/mux.h>
  45
  46 #undef NEW_BOARD_LEARNING_MODE
  47
  48 static void omap_kp_tasklet(unsigned long);
  49 static void omap_kp_timer(unsigned long);
  50
  51 static unsigned char keypad_state[8];
  52 static DEFINE_MUTEX(kp_enable_mutex);
  53 static int kp_enable = 1;
  54 static int kp_cur_group = -1;
  55
  56 struct omap_kp {
  57         struct input_dev *input;
  58         struct timer_list timer;
  59         int irq;
  60         unsigned int rows;
  61         unsigned int cols;
  62         unsigned long delay;
  63         unsigned int debounce;
  64 };
  65
  66 static DECLARE_TASKLET_DISABLED(kp_tasklet, omap_kp_tasklet, 0);
  67
  68 static int *keymap;
  69 static unsigned int *row_gpios;
  70 static unsigned int *col_gpios;
  71
  72 #ifdef CONFIG_ARCH_OMAP2
  73 static void set_col_gpio_val(struct omap_kp *omap_kp, u8 value)
  74 {
  75         int col;
  76
  77         for (col = 0; col < omap_kp->cols; col++)
  78                 gpio_set_value(col_gpios[col], value & (1 << col));
  79 }
  80
  81 static u8 get_row_gpio_val(struct omap_kp *omap_kp)
  82 {
  83         int row;
  84         u8 value = 0;
  85
  86         for (row = 0; row < omap_kp->rows; row++) {
  87                 if (gpio_get_value(row_gpios[row]))
  88                         value |= (1 << row);
  89         }
  90         return value;
  91 }
  92 #else
  93 #define         set_col_gpio_val(x, y)  do {} while (0)
  94 #define         get_row_gpio_val(x)     0
  95 #endif
  96
  97 static irqreturn_t omap_kp_interrupt(int irq, void *dev_id)
  98 {
  99         struct omap_kp *omap_kp = dev_id;
 100
 101         /* disable keyboard interrupt and schedule for handling */
 102         if (cpu_is_omap24xx()) {
 103                 int i;
 104
 105                 for (i = 0; i < omap_kp->rows; i++) {
 106                         int gpio_irq = gpio_to_irq(row_gpios[i]);
 107                         /*
 108                          * The interrupt which we're currently handling should
 109                          * be disabled _nosync() to avoid deadlocks waiting
 110                          * for this handler to complete.  All others should
 111                          * be disabled the regular way for SMP safety.
 112                          */
 113                         if (gpio_irq == irq)
 114                                 disable_irq_nosync(gpio_irq);
 115                         else
 116                                 disable_irq(gpio_irq);
 117                 }
 118         } else
 119                 /* disable keyboard interrupt and schedule for handling */
 120                 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 121
 122         tasklet_schedule(&kp_tasklet);
 123
 124         return IRQ_HANDLED;
 125 }
 126
 127 static void omap_kp_timer(unsigned long data)
 128 {
 129         tasklet_schedule(&kp_tasklet);
 130 }
 131
 132 static void omap_kp_scan_keypad(struct omap_kp *omap_kp, unsigned char *state)
 133 {
 134         int col = 0;
 135
 136         /* read the keypad status */
 137         if (cpu_is_omap24xx()) {
 138                 /* read the keypad status */
 139                 for (col = 0; col < omap_kp->cols; col++) {
 140                         set_col_gpio_val(omap_kp, ~(1 << col));
 141                         state[col] = ~(get_row_gpio_val(omap_kp)) & 0xff;
 142                 }
 143                 set_col_gpio_val(omap_kp, 0);
 144
 145         } else {
 146                 /* disable keyboard interrupt and schedule for handling */
 147                 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 148
 149                 /* read the keypad status */
 150                 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
 151                 for (col = 0; col < omap_kp->cols; col++) {
 152                         omap_writew(~(1 << col) & 0xff,
 153                                     OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
 154
 155                         udelay(omap_kp->delay);
 156
 157                         state[col] = ~omap_readw(OMAP1_MPUIO_BASE +
 158                                                  OMAP_MPUIO_KBR_LATCH) & 0xff;
 159                 }
 160                 omap_writew(0x00, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBC);
 161                 udelay(2);
 162         }
 163 }
 164
 165 static inline int omap_kp_find_key(int col, int row)
 166 {
 167         int i, key;
 168
 169         key = KEY(col, row, 0);
 170         for (i = 0; keymap[i] != 0; i++)
 171                 if ((keymap[i] & 0xff000000) == key)
 172                         return keymap[i] & 0x00ffffff;
 173         return -1;
 174 }
 175
 176 static void omap_kp_tasklet(unsigned long data)
 177 {
 178         struct omap_kp *omap_kp_data = (struct omap_kp *) data;
 179         unsigned char new_state[8], changed, key_down = 0;
 180         int col, row;
 181         int spurious = 0;
 182
 183         /* check for any changes */
 184         omap_kp_scan_keypad(omap_kp_data, new_state);
 185
 186         /* check for changes and print those */
 187         for (col = 0; col < omap_kp_data->cols; col++) {
 188                 changed = new_state[col] ^ keypad_state[col];
 189                 key_down |= new_state[col];
 190                 if (changed == 0)
 191                         continue;
 192
 193                 for (row = 0; row < omap_kp_data->rows; row++) {
 194                         int key;
 195                         if (!(changed & (1 << row)))
 196                                 continue;
 197 #ifdef NEW_BOARD_LEARNING_MODE
 198                         printk(KERN_INFO "omap-keypad: key %d-%d %s\n", col,
 199                                row, (new_state[col] & (1 << row)) ?
 200                                "pressed" : "released");
 201 #else
 202                         key = omap_kp_find_key(col, row);
 203                         if (key < 0) {
 204                                 printk(KERN_WARNING
 205                                       "omap-keypad: Spurious key event %d-%d\n",
 206                                        col, row);
 207                                 /* We scan again after a couple of seconds */
 208                                 spurious = 1;
 209                                 continue;
 210                         }
 211
 212                         if (!(kp_cur_group == (key & GROUP_MASK) ||
 213                               kp_cur_group == -1))
 214                                 continue;
 215
 216                         kp_cur_group = key & GROUP_MASK;
 217                         input_report_key(omap_kp_data->input, key & ~GROUP_MASK,
 218                                          new_state[col] & (1 << row));
 219 #endif
 220                 }
 221         }
 222         memcpy(keypad_state, new_state, sizeof(keypad_state));
 223
 224         if (key_down) {
 225                 int delay = HZ / 20;
 226                 /* some key is pressed - keep irq disabled and use timer
 227                  * to poll the keypad */
 228                 if (spurious)
 229                         delay = 2 * HZ;
 230                 mod_timer(&omap_kp_data->timer, jiffies + delay);
 231         } else {
 232                 /* enable interrupts */
 233                 if (cpu_is_omap24xx()) {
 234                         int i;
 235                         for (i = 0; i < omap_kp_data->rows; i++)
 236                                 enable_irq(gpio_to_irq(row_gpios[i]));
 237                 } else {
 238                         omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 239                         kp_cur_group = -1;
 240                 }
 241         }
 242 }
 243
 244 static ssize_t omap_kp_enable_show(struct device *dev,
 245                                    struct device_attribute *attr, char *buf)
 246 {
 247         return sprintf(buf, "%u\n", kp_enable);
 248 }
 249
 250 static ssize_t omap_kp_enable_store(struct device *dev, struct device_attribute *attr,
 251                                     const char *buf, size_t count)
 252 {
 253         int state;
 254
 255         if (sscanf(buf, "%u", &state) != 1)
 256                 return -EINVAL;
 257
 258         if ((state != 1) && (state != 0))
 259                 return -EINVAL;
 260
 261         mutex_lock(&kp_enable_mutex);
 262         if (state != kp_enable) {
 263                 if (state)
 264                         enable_irq(INT_KEYBOARD);
 265                 else
 266                         disable_irq(INT_KEYBOARD);
 267                 kp_enable = state;
 268         }
 269         mutex_unlock(&kp_enable_mutex);
 270
 271         return strnlen(buf, count);
 272 }
 273
 274 static DEVICE_ATTR(enable, S_IRUGO | S_IWUSR, omap_kp_enable_show, omap_kp_enable_store);
 275
 276 #ifdef CONFIG_PM
 277 static int omap_kp_suspend(struct platform_device *dev, pm_message_t state)
 278 {
 279         /* Nothing yet */
 280
 281         return 0;
 282 }
 283
 284 static int omap_kp_resume(struct platform_device *dev)
 285 {
 286         /* Nothing yet */
 287
 288         return 0;
 289 }
 290 #else
 291 #define omap_kp_suspend NULL
 292 #define omap_kp_resume  NULL
 293 #endif
 294
 295 static int __devinit omap_kp_probe(struct platform_device *pdev)
 296 {
 297         struct omap_kp *omap_kp;
 298         struct input_dev *input_dev;
 299         struct omap_kp_platform_data *pdata =  pdev->dev.platform_data;
 300         int i, col_idx, row_idx, irq_idx, ret;
 301
 302         if (!pdata->rows || !pdata->cols || !pdata->keymap) {
 303                 printk(KERN_ERR "No rows, cols or keymap from pdata\n");
 304                 return -EINVAL;
 305         }
 306
 307         omap_kp = kzalloc(sizeof(struct omap_kp), GFP_KERNEL);
 308         input_dev = input_allocate_device();
 309         if (!omap_kp || !input_dev) {
 310                 kfree(omap_kp);
 311                 input_free_device(input_dev);
 312                 return -ENOMEM;
 313         }
 314
 315         platform_set_drvdata(pdev, omap_kp);
 316
 317         omap_kp->input = input_dev;
 318
 319         /* Disable the interrupt for the MPUIO keyboard */
 320         if (!cpu_is_omap24xx())
 321                 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 322
 323         keymap = pdata->keymap;
 324
 325         if (pdata->rep)
 326                 __set_bit(EV_REP, input_dev->evbit);
 327
 328         if (pdata->delay)
 329                 omap_kp->delay = pdata->delay;
 330
 331         if (pdata->row_gpios && pdata->col_gpios) {
 332                 row_gpios = pdata->row_gpios;
 333                 col_gpios = pdata->col_gpios;
 334         }
 335
 336         omap_kp->rows = pdata->rows;
 337         omap_kp->cols = pdata->cols;
 338
 339         if (cpu_is_omap24xx()) {
 340                 /* Cols: outputs */
 341                 for (col_idx = 0; col_idx < omap_kp->cols; col_idx++) {
 342                         if (gpio_request(col_gpios[col_idx], "omap_kp_col") < 0) {
 343                                 printk(KERN_ERR "Failed to request"
 344                                        "GPIO%d for keypad\n",
 345                                        col_gpios[col_idx]);
 346                                 goto err1;
 347                         }
 348                         gpio_direction_output(col_gpios[col_idx], 0);
 349                 }
 350                 /* Rows: inputs */
 351                 for (row_idx = 0; row_idx < omap_kp->rows; row_idx++) {
 352                         if (gpio_request(row_gpios[row_idx], "omap_kp_row") < 0) {
 353                                 printk(KERN_ERR "Failed to request"
 354                                        "GPIO%d for keypad\n",
 355                                        row_gpios[row_idx]);
 356                                 goto err2;
 357                         }
 358                         gpio_direction_input(row_gpios[row_idx]);
 359                 }
 360         } else {
 361                 col_idx = 0;
 362                 row_idx = 0;
 363         }
 364
 365         setup_timer(&omap_kp->timer, omap_kp_timer, (unsigned long)omap_kp);
 366
 367         /* get the irq and init timer*/
 368         tasklet_enable(&kp_tasklet);
 369         kp_tasklet.data = (unsigned long) omap_kp;
 370
 371         ret = device_create_file(&pdev->dev, &dev_attr_enable);
 372         if (ret < 0)
 373                 goto err2;
 374
 375         /* setup input device */
 376         __set_bit(EV_KEY, input_dev->evbit);
 377         for (i = 0; keymap[i] != 0; i++)
 378                 __set_bit(keymap[i] & KEY_MAX, input_dev->keybit);
 379         input_dev->name = "omap-keypad";
 380         input_dev->phys = "omap-keypad/input0";
 381         input_dev->dev.parent = &pdev->dev;
 382
 383         input_dev->id.bustype = BUS_HOST;
 384         input_dev->id.vendor = 0x0001;
 385         input_dev->id.product = 0x0001;
 386         input_dev->id.version = 0x0100;
 387
 388         ret = input_register_device(omap_kp->input);
 389         if (ret < 0) {
 390                 printk(KERN_ERR "Unable to register omap-keypad input device\n");
 391                 goto err3;
 392         }
 393
 394         if (pdata->dbounce)
 395                 omap_writew(0xff, OMAP1_MPUIO_BASE + OMAP_MPUIO_GPIO_DEBOUNCING);
 396
 397         /* scan current status and enable interrupt */
 398         omap_kp_scan_keypad(omap_kp, keypad_state);
 399         if (!cpu_is_omap24xx()) {
 400                 omap_kp->irq = platform_get_irq(pdev, 0);
 401                 if (omap_kp->irq >= 0) {
 402                         if (request_irq(omap_kp->irq, omap_kp_interrupt, 0,
 403                                         "omap-keypad", omap_kp) < 0)
 404                                 goto err4;
 405                 }
 406                 omap_writew(0, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 407         } else {
 408                 for (irq_idx = 0; irq_idx < omap_kp->rows; irq_idx++) {
 409                         if (request_irq(gpio_to_irq(row_gpios[irq_idx]),
 410                                         omap_kp_interrupt,
 411                                         IRQF_TRIGGER_FALLING,
 412                                         "omap-keypad", omap_kp) < 0)
 413                                 goto err5;
 414                 }
 415         }
 416         return 0;
 417 err5:
 418         for (i = irq_idx - 1; i >=0; i--)
 419                 free_irq(row_gpios[i], 0);
 420 err4:
 421         input_unregister_device(omap_kp->input);
 422         input_dev = NULL;
 423 err3:
 424         device_remove_file(&pdev->dev, &dev_attr_enable);
 425 err2:
 426         for (i = row_idx - 1; i >=0; i--)
 427                 gpio_free(row_gpios[i]);
 428 err1:
 429         for (i = col_idx - 1; i >=0; i--)
 430                 gpio_free(col_gpios[i]);
 431
 432         kfree(omap_kp);
 433         input_free_device(input_dev);
 434
 435         return -EINVAL;
 436 }
 437
 438 static int __devexit omap_kp_remove(struct platform_device *pdev)
 439 {
 440         struct omap_kp *omap_kp = platform_get_drvdata(pdev);
 441
 442         /* disable keypad interrupt handling */
 443         tasklet_disable(&kp_tasklet);
 444         if (cpu_is_omap24xx()) {
 445                 int i;
 446                 for (i = 0; i < omap_kp->cols; i++)
 447                         gpio_free(col_gpios[i]);
 448                 for (i = 0; i < omap_kp->rows; i++) {
 449                         gpio_free(row_gpios[i]);
 450                         free_irq(gpio_to_irq(row_gpios[i]), 0);
 451                 }
 452         } else {
 453                 omap_writew(1, OMAP1_MPUIO_BASE + OMAP_MPUIO_KBD_MASKIT);
 454                 free_irq(omap_kp->irq, 0);
 455         }
 456
 457         del_timer_sync(&omap_kp->timer);
 458         tasklet_kill(&kp_tasklet);
 459
 460         /* unregister everything */
 461         input_unregister_device(omap_kp->input);
 462
 463         kfree(omap_kp);
 464
 465         return 0;
 466 }
 467
 468 static struct platform_driver omap_kp_driver = {
 469         .probe          = omap_kp_probe,
 470         .remove         = __devexit_p(omap_kp_remove),
 471         .suspend        = omap_kp_suspend,
 472         .resume         = omap_kp_resume,
 473         .driver         = {
 474                 .name   = "omap-keypad",
 475                 .owner  = THIS_MODULE,
 476         },
 477 };
 478
 479 static int __init omap_kp_init(void)
 480 {
 481         printk(KERN_INFO "OMAP Keypad Driver\n");
 482         return platform_driver_register(&omap_kp_driver);
 483 }
 484
 485 static void __exit omap_kp_exit(void)
 486 {
 487         platform_driver_unregister(&omap_kp_driver);
 488 }
 489
 490 module_init(omap_kp_init);
 491 module_exit(omap_kp_exit);
 492
 493 MODULE_AUTHOR("Timo Teräs");
 494 MODULE_DESCRIPTION("OMAP Keypad Driver");
 495 MODULE_LICENSE("GPL");
 496 MODULE_ALIAS("platform:omap-keypad");