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