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locomokbd.c

/*
 *  Copyright (c) 2005 John Lenz
 *
 * Based on from xtkbd.c
 */

/*
 * LoCoMo keyboard driver for Linux/ARM
 */

/*
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 */

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/delay.h>
#include <linux/device.h>
#include <linux/interrupt.h>
#include <linux/ioport.h>

#include <asm/hardware/locomo.h>
#include <asm/irq.h>

MODULE_AUTHOR("John Lenz <lenz@cs.wisc.edu>");
MODULE_DESCRIPTION("LoCoMo keyboard driver");
MODULE_LICENSE("GPL");

#define LOCOMOKBD_NUMKEYS     128

#define KEY_ACTIVITY          KEY_F16
#define KEY_CONTACT           KEY_F18
#define KEY_CENTER            KEY_F15

static unsigned char locomokbd_keycode[LOCOMOKBD_NUMKEYS] = {
      0, KEY_ESC, KEY_ACTIVITY, 0, 0, 0, 0, 0, 0, 0,                    /* 0 - 9 */
      0, 0, 0, 0, 0, 0, 0, KEY_MENU, KEY_HOME, KEY_CONTACT,             /* 10 - 19 */
      0, 0, 0, 0, 0, 0, 0, 0, 0, 0,                               /* 20 - 29 */
      0, 0, 0, KEY_CENTER, 0, KEY_MAIL, 0, 0, 0, 0,                     /* 30 - 39 */
      0, 0, 0, 0, 0, 0, 0, 0, 0, KEY_RIGHT,                             /* 40 - 49 */
      KEY_UP, KEY_LEFT, 0, 0, KEY_P, 0, KEY_O, KEY_I, KEY_Y, KEY_T,           /* 50 - 59 */
      KEY_E, KEY_W, 0, 0, 0, 0, KEY_DOWN, KEY_ENTER, 0, 0,              /* 60 - 69 */
      KEY_BACKSPACE, 0, KEY_L, KEY_U, KEY_H, KEY_R, KEY_D, KEY_Q, 0, 0, /* 70 - 79 */
      0, 0, 0, 0, 0, 0, KEY_ENTER, KEY_RIGHTSHIFT, KEY_K, KEY_J,        /* 80 - 89 */
      KEY_G, KEY_F, KEY_X, KEY_S, 0, 0, 0, 0, 0, 0,                     /* 90 - 99 */
      0, 0, KEY_DOT, 0, KEY_COMMA, KEY_N, KEY_B, KEY_C, KEY_Z, KEY_A,         /* 100 - 109 */
      KEY_LEFTSHIFT, KEY_TAB, KEY_LEFTCTRL, 0, 0, 0, 0, 0, 0, 0,        /* 110 - 119 */
      KEY_M, KEY_SPACE, KEY_V, KEY_APOSTROPHE, KEY_SLASH, 0, 0, 0       /* 120 - 128 */
};

#define KB_ROWS               16
#define KB_COLS               8
#define KB_ROWMASK(r)         (1 << (r))
#define SCANCODE(c,r)         ( ((c)<<4) + (r) + 1 )
#define     NR_SCANCODES            128

#define KB_DELAY        8
#define SCAN_INTERVAL         (HZ/10)
#define LOCOMOKBD_PRESSED     1

struct locomokbd {
      unsigned char keycode[LOCOMOKBD_NUMKEYS];
      struct input_dev *input;
      char phys[32];

      struct locomo_dev *ldev;
      unsigned long base;
      spinlock_t lock;

      struct timer_list timer;
};

/* helper functions for reading the keyboard matrix */
static inline void locomokbd_charge_all(unsigned long membase)
{
      locomo_writel(0x00FF, membase + LOCOMO_KSC);
}

static inline void locomokbd_activate_all(unsigned long membase)
{
      unsigned long r;

      locomo_writel(0, membase + LOCOMO_KSC);
      r = locomo_readl(membase + LOCOMO_KIC);
      r &= 0xFEFF;
      locomo_writel(r, membase + LOCOMO_KIC);
}

static inline void locomokbd_activate_col(unsigned long membase, int col)
{
      unsigned short nset;
      unsigned short nbset;

      nset = 0xFF & ~(1 << col);
      nbset = (nset << 8) + nset;
      locomo_writel(nbset, membase + LOCOMO_KSC);
}

static inline void locomokbd_reset_col(unsigned long membase, int col)
{
      unsigned short nbset;

      nbset = ((0xFF & ~(1 << col)) << 8) + 0xFF;
      locomo_writel(nbset, membase + LOCOMO_KSC);
}

/*
 * The LoCoMo keyboard only generates interrupts when a key is pressed.
 * So when a key is pressed, we enable a timer.  This timer scans the
 * keyboard, and this is how we detect when the key is released.
 */

/* Scan the hardware keyboard and push any changes up through the input layer */
static void locomokbd_scankeyboard(struct locomokbd *locomokbd)
{
      unsigned int row, col, rowd, scancode;
      unsigned long flags;
      unsigned int num_pressed;
      unsigned long membase = locomokbd->base;

      spin_lock_irqsave(&locomokbd->lock, flags);

      locomokbd_charge_all(membase);

      num_pressed = 0;
      for (col = 0; col < KB_COLS; col++) {

            locomokbd_activate_col(membase, col);
            udelay(KB_DELAY);

            rowd = ~locomo_readl(membase + LOCOMO_KIB);
            for (row = 0; row < KB_ROWS; row++) {
                  scancode = SCANCODE(col, row);
                  if (rowd & KB_ROWMASK(row)) {
                        num_pressed += 1;
                        input_report_key(locomokbd->input, locomokbd->keycode[scancode], 1);
                  } else {
                        input_report_key(locomokbd->input, locomokbd->keycode[scancode], 0);
                  }
            }
            locomokbd_reset_col(membase, col);
      }
      locomokbd_activate_all(membase);

      input_sync(locomokbd->input);

      /* if any keys are pressed, enable the timer */
      if (num_pressed)
            mod_timer(&locomokbd->timer, jiffies + SCAN_INTERVAL);

      spin_unlock_irqrestore(&locomokbd->lock, flags);
}

/*
 * LoCoMo keyboard interrupt handler.
 */
static irqreturn_t locomokbd_interrupt(int irq, void *dev_id)
{
      struct locomokbd *locomokbd = dev_id;
      /** wait chattering delay **/
      udelay(100);

      locomokbd_scankeyboard(locomokbd);

      return IRQ_HANDLED;
}

/*
 * LoCoMo timer checking for released keys
 */
static void locomokbd_timer_callback(unsigned long data)
{
      struct locomokbd *locomokbd = (struct locomokbd *) data;
      locomokbd_scankeyboard(locomokbd);
}

static int locomokbd_probe(struct locomo_dev *dev)
{
      struct locomokbd *locomokbd;
      struct input_dev *input_dev;
      int i, err;

      locomokbd = kzalloc(sizeof(struct locomokbd), GFP_KERNEL);
      input_dev = input_allocate_device();
      if (!locomokbd || !input_dev) {
            err = -ENOMEM;
            goto err_free_mem;
      }

      /* try and claim memory region */
      if (!request_mem_region((unsigned long) dev->mapbase,
                        dev->length,
                        LOCOMO_DRIVER_NAME(dev))) {
            err = -EBUSY;
            printk(KERN_ERR "locomokbd: Can't acquire access to io memory for keyboard\n");
            goto err_free_mem;
      }

      locomokbd->ldev = dev;
      locomo_set_drvdata(dev, locomokbd);

      locomokbd->base = (unsigned long) dev->mapbase;

      spin_lock_init(&locomokbd->lock);

      init_timer(&locomokbd->timer);
      locomokbd->timer.function = locomokbd_timer_callback;
      locomokbd->timer.data = (unsigned long) locomokbd;

      locomokbd->input = input_dev;
      strcpy(locomokbd->phys, "locomokbd/input0");

      input_dev->name = "LoCoMo keyboard";
      input_dev->phys = locomokbd->phys;
      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 = &dev->dev;

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

      memcpy(locomokbd->keycode, locomokbd_keycode, sizeof(locomokbd->keycode));
      for (i = 0; i < LOCOMOKBD_NUMKEYS; i++)
            set_bit(locomokbd->keycode[i], input_dev->keybit);
      clear_bit(0, input_dev->keybit);

      /* attempt to get the interrupt */
      err = request_irq(dev->irq[0], locomokbd_interrupt, 0, "locomokbd", locomokbd);
      if (err) {
            printk(KERN_ERR "locomokbd: Can't get irq for keyboard\n");
            goto err_release_region;
      }

      err = input_register_device(locomokbd->input);
      if (err)
            goto err_free_irq;

      return 0;

 err_free_irq:
      free_irq(dev->irq[0], locomokbd);
 err_release_region:
      release_mem_region((unsigned long) dev->mapbase, dev->length);
      locomo_set_drvdata(dev, NULL);
 err_free_mem:
      input_free_device(input_dev);
      kfree(locomokbd);

      return err;
}

static int locomokbd_remove(struct locomo_dev *dev)
{
      struct locomokbd *locomokbd = locomo_get_drvdata(dev);

      free_irq(dev->irq[0], locomokbd);

      del_timer_sync(&locomokbd->timer);

      input_unregister_device(locomokbd->input);
      locomo_set_drvdata(dev, NULL);

      release_mem_region((unsigned long) dev->mapbase, dev->length);

      kfree(locomokbd);

      return 0;
}

static struct locomo_driver keyboard_driver = {
      .drv = {
            .name = "locomokbd"
      },
      .devid      = LOCOMO_DEVID_KEYBOARD,
      .probe      = locomokbd_probe,
      .remove     = locomokbd_remove,
};

static int __init locomokbd_init(void)
{
      return locomo_driver_register(&keyboard_driver);
}

static void __exit locomokbd_exit(void)
{
      locomo_driver_unregister(&keyboard_driver);
}

module_init(locomokbd_init);
module_exit(locomokbd_exit);

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