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/*

 *  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);