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aaed2000_kbd.c

/*
 *  Keyboard driver for the AAED-2000 dev board
 *
 *  Copyright (c) 2006 Nicolas Bellido Y Ortega
 *
 *  Based on corgikbd.c
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 */

#include <linux/delay.h>
#include <linux/platform_device.h>
#include <linux/init.h>
#include <linux/input-polldev.h>
#include <linux/interrupt.h>
#include <linux/jiffies.h>
#include <linux/module.h>
#include <linux/slab.h>

#include <asm/arch/hardware.h>
#include <asm/arch/aaed2000.h>

#define KB_ROWS               12
#define KB_COLS               8
#define KB_ROWMASK(r)         (1 << (r))
#define SCANCODE(r,c)         (((c) * KB_ROWS) + (r))
#define NR_SCANCODES          (KB_COLS * KB_ROWS)

#define SCAN_INTERVAL         (50) /* ms */
#define KB_ACTIVATE_DELAY     (20) /* us */

static unsigned char aaedkbd_keycode[NR_SCANCODES] = {
      KEY_9, KEY_0, KEY_MINUS, KEY_EQUAL, KEY_BACKSPACE, 0, KEY_SPACE, KEY_KP6, 0, KEY_KPDOT, 0, 0,
      KEY_K, KEY_M, KEY_O, KEY_DOT, KEY_SLASH, 0, KEY_F, 0, 0, 0, KEY_LEFTSHIFT, 0,
      KEY_I, KEY_P, KEY_LEFTBRACE, KEY_RIGHTBRACE, KEY_BACKSLASH, 0, 0, 0, 0, 0, KEY_RIGHTSHIFT, 0,
      KEY_8, KEY_L, KEY_SEMICOLON, KEY_APOSTROPHE, KEY_ENTER, 0, 0, 0, 0, 0, 0, 0,
      KEY_J, KEY_H, KEY_B, KEY_KP8, KEY_KP4, 0, KEY_C, KEY_D, KEY_S, KEY_A, 0, KEY_CAPSLOCK,
      KEY_Y, KEY_U, KEY_N, KEY_T, 0, 0, KEY_R, KEY_E, KEY_W, KEY_Q, 0, KEY_TAB,
      KEY_7, KEY_6, KEY_G, 0, KEY_5, 0, KEY_4, KEY_3, KEY_2, KEY_1, 0, KEY_GRAVE,
      0, 0, KEY_COMMA, 0, KEY_KP2, 0, KEY_V, KEY_LEFTALT, KEY_X, KEY_Z, 0, KEY_LEFTCTRL
};

struct aaedkbd {
      unsigned char keycode[ARRAY_SIZE(aaedkbd_keycode)];
      struct input_polled_dev *poll_dev;
      int kbdscan_state[KB_COLS];
      int kbdscan_count[KB_COLS];
};

#define KBDSCAN_STABLE_COUNT 2

static void aaedkbd_report_col(struct aaedkbd *aaedkbd,
                        unsigned int col, unsigned int rowd)
{
      unsigned int scancode, pressed;
      unsigned int row;

      for (row = 0; row < KB_ROWS; row++) {
            scancode = SCANCODE(row, col);
            pressed = rowd & KB_ROWMASK(row);

            input_report_key(aaedkbd->poll_dev->input,
                         aaedkbd->keycode[scancode], pressed);
      }
}

/* Scan the hardware keyboard and push any changes up through the input layer */
static void aaedkbd_poll(struct input_polled_dev *dev)
{
      struct aaedkbd *aaedkbd = dev->private;
      unsigned int col, rowd;

      col = 0;
      do {
            AAEC_GPIO_KSCAN = col + 8;
            udelay(KB_ACTIVATE_DELAY);
            rowd = AAED_EXT_GPIO & AAED_EGPIO_KBD_SCAN;

            if (rowd != aaedkbd->kbdscan_state[col]) {
                  aaedkbd->kbdscan_count[col] = 0;
                  aaedkbd->kbdscan_state[col] = rowd;
            } else if (++aaedkbd->kbdscan_count[col] >= KBDSCAN_STABLE_COUNT) {
                  aaedkbd_report_col(aaedkbd, col, rowd);
                  col++;
            }
      } while (col < KB_COLS);

      AAEC_GPIO_KSCAN = 0x07;
      input_sync(dev->input);
}

static int __devinit aaedkbd_probe(struct platform_device *pdev)
{
      struct aaedkbd *aaedkbd;
      struct input_polled_dev *poll_dev;
      struct input_dev *input_dev;
      int i;
      int error;

      aaedkbd = kzalloc(sizeof(struct aaedkbd), GFP_KERNEL);
      poll_dev = input_allocate_polled_device();
      if (!aaedkbd || !poll_dev) {
            error = -ENOMEM;
            goto fail;
      }

      platform_set_drvdata(pdev, aaedkbd);

      aaedkbd->poll_dev = poll_dev;
      memcpy(aaedkbd->keycode, aaedkbd_keycode, sizeof(aaedkbd->keycode));

      poll_dev->private = aaedkbd;
      poll_dev->poll = aaedkbd_poll;
      poll_dev->poll_interval = SCAN_INTERVAL;

      input_dev = poll_dev->input;
      input_dev->name = "AAED-2000 Keyboard";
      input_dev->phys = "aaedkbd/input0";
      input_dev->id.bustype = BUS_HOST;
      input_dev->id.vendor = 0x0001;
      input_dev->id.product = 0x0001;
      input_dev->id.version = 0x0100;
      input_dev->dev.parent = &pdev->dev;

      input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
      input_dev->keycode = aaedkbd->keycode;
      input_dev->keycodesize = sizeof(unsigned char);
      input_dev->keycodemax = ARRAY_SIZE(aaedkbd_keycode);

      for (i = 0; i < ARRAY_SIZE(aaedkbd_keycode); i++)
            set_bit(aaedkbd->keycode[i], input_dev->keybit);
      clear_bit(0, input_dev->keybit);

      error = input_register_polled_device(aaedkbd->poll_dev);
      if (error)
            goto fail;

      return 0;

 fail:      kfree(aaedkbd);
      input_free_polled_device(poll_dev);
      return error;
}

static int __devexit aaedkbd_remove(struct platform_device *pdev)
{
      struct aaedkbd *aaedkbd = platform_get_drvdata(pdev);

      input_unregister_polled_device(aaedkbd->poll_dev);
      input_free_polled_device(aaedkbd->poll_dev);
      kfree(aaedkbd);

      return 0;
}

static struct platform_driver aaedkbd_driver = {
      .probe            = aaedkbd_probe,
      .remove           = __devexit_p(aaedkbd_remove),
      .driver           = {
            .name = "aaed2000-keyboard",
      },
};

static int __init aaedkbd_init(void)
{
      return platform_driver_register(&aaedkbd_driver);
}

static void __exit aaedkbd_exit(void)
{
      platform_driver_unregister(&aaedkbd_driver);
}

module_init(aaedkbd_init);
module_exit(aaedkbd_exit);

MODULE_AUTHOR("Nicolas Bellido Y Ortega");
MODULE_DESCRIPTION("AAED-2000 Keyboard Driver");
MODULE_LICENSE("GPLv2");

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