newtonkbd.c

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/*
 *  Copyright (c) 2000 Justin Cormack
 */

/*
 * Newton keyboard driver for Linux
 */

/*
 * 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
 *
 * Should you need to contact me, the author, you can do so either by
 * e-mail - mail your message to <[email protected]>, or by paper mail:
 * Justin Cormack, 68 Dartmouth Park Road, London NW5 1SN, UK.
 */

#include <linux/slab.h>
#include <linux/module.h>
#include <linux/input.h>
#include <linux/init.h>
#include <linux/serio.h>

#define DRIVER_DESC "Newton keyboard driver"

MODULE_AUTHOR("Justin Cormack <[email protected]>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");

#define NKBD_KEY    0x7f
#define NKBD_PRESS  0x80

static unsigned char nkbd_keycode[128] = {
    KEY_A, KEY_S, KEY_D, KEY_F, KEY_H, KEY_G, KEY_Z, KEY_X,
    KEY_C, KEY_V, 0, KEY_B, KEY_Q, KEY_W, KEY_E, KEY_R,
    KEY_Y, KEY_T, KEY_1, KEY_2, KEY_3, KEY_4, KEY_6, KEY_5,
    KEY_EQUAL, KEY_9, KEY_7, KEY_MINUS, KEY_8, KEY_0, KEY_RIGHTBRACE, KEY_O,
    KEY_U, KEY_LEFTBRACE, KEY_I, KEY_P, KEY_ENTER, KEY_L, KEY_J, KEY_APOSTROPHE,
    KEY_K, KEY_SEMICOLON, KEY_BACKSLASH, KEY_COMMA, KEY_SLASH, KEY_N, KEY_M, KEY_DOT,
    KEY_TAB, KEY_SPACE, KEY_GRAVE, KEY_DELETE, 0, 0, 0, KEY_LEFTMETA,
    KEY_LEFTSHIFT, KEY_CAPSLOCK, KEY_LEFTALT, KEY_LEFTCTRL, KEY_RIGHTSHIFT, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
    KEY_LEFT, KEY_RIGHT, KEY_DOWN, KEY_UP, 0
};

struct nkbd {
    unsigned char keycode[128];
    struct input_dev *dev;
    struct serio *serio;
    char phys[32];
};

static irqreturn_t nkbd_interrupt(struct serio *serio,
        unsigned char data, unsigned int flags)
{
    struct nkbd *nkbd = serio_get_drvdata(serio);

    /* invalid scan codes are probably the init sequence, so we ignore them */
    if (nkbd->keycode[data & NKBD_KEY]) {
        input_report_key(nkbd->dev, nkbd->keycode[data & NKBD_KEY], data & NKBD_PRESS);
        input_sync(nkbd->dev);
    }

    else if (data == 0xe7) /* end of init sequence */
        printk(KERN_INFO "input: %s on %s\n", nkbd->dev->name, serio->phys);
    return IRQ_HANDLED;

}

static int nkbd_connect(struct serio *serio, struct serio_driver *drv)
{
    struct nkbd *nkbd;
    struct input_dev *input_dev;
    int err = -ENOMEM;
    int i;

    nkbd = kzalloc(sizeof(struct nkbd), GFP_KERNEL);
    input_dev = input_allocate_device();
    if (!nkbd || !input_dev)
        goto fail1;

    nkbd->serio = serio;
    nkbd->dev = input_dev;
    snprintf(nkbd->phys, sizeof(nkbd->phys), "%s/input0", serio->phys);
    memcpy(nkbd->keycode, nkbd_keycode, sizeof(nkbd->keycode));

    input_dev->name = "Newton Keyboard";
    input_dev->phys = nkbd->phys;
    input_dev->id.bustype = BUS_RS232;
    input_dev->id.vendor = SERIO_NEWTON;
    input_dev->id.product = 0x0001;
    input_dev->id.version = 0x0100;
    input_dev->dev.parent = &serio->dev;

    input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_REP);
    input_dev->keycode = nkbd->keycode;
    input_dev->keycodesize = sizeof(unsigned char);
    input_dev->keycodemax = ARRAY_SIZE(nkbd_keycode);
    for (i = 0; i < 128; i++)
        set_bit(nkbd->keycode[i], input_dev->keybit);
    clear_bit(0, input_dev->keybit);

    serio_set_drvdata(serio, nkbd);

    err = serio_open(serio, drv);
    if (err)
        goto fail2;

    err = input_register_device(nkbd->dev);
    if (err)
        goto fail3;

    return 0;

 fail3: serio_close(serio);
 fail2: serio_set_drvdata(serio, NULL);
 fail1: input_free_device(input_dev);
    kfree(nkbd);
    return err;
}

static void nkbd_disconnect(struct serio *serio)
{
    struct nkbd *nkbd = serio_get_drvdata(serio);

    serio_close(serio);
    serio_set_drvdata(serio, NULL);
    input_unregister_device(nkbd->dev);
    kfree(nkbd);
}

static struct serio_device_id nkbd_serio_ids[] = {
    {
        .type   = SERIO_RS232,
        .proto  = SERIO_NEWTON,
        .id = SERIO_ANY,
        .extra  = SERIO_ANY,
    },
    { 0 }
};

MODULE_DEVICE_TABLE(serio, nkbd_serio_ids);

static struct serio_driver nkbd_drv = {
    .driver     = {
        .name   = "newtonkbd",
    },
    .description    = DRIVER_DESC,
    .id_table   = nkbd_serio_ids,
    .interrupt  = nkbd_interrupt,
    .connect    = nkbd_connect,
    .disconnect = nkbd_disconnect,
};

module_serio_driver(nkbd_drv);