jornada720_kbd.c

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/*
 * drivers/input/keyboard/jornada720_kbd.c
 *
 * HP Jornada 720 keyboard platform driver
 *
 * Copyright (C) 2006/2007 Kristoffer Ericson <[email protected]>
 *
 *    Copyright (C) 2006 jornada 720 kbd driver by
        Filip Zyzniewsk <[email protected]
 *     based on (C) 2004 jornada 720 kbd driver by
        Alex Lange <[email protected]>
 *
 * 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/device.h>
#include <linux/errno.h>
#include <linux/interrupt.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>
#include <linux/slab.h>

#include <mach/jornada720.h>
#include <mach/hardware.h>
#include <mach/irqs.h>

MODULE_AUTHOR("Kristoffer Ericson <[email protected]>");
MODULE_DESCRIPTION("HP Jornada 710/720/728 keyboard driver");
MODULE_LICENSE("GPL v2");

static unsigned short jornada_std_keymap[128] = {                   /* ROW */
    0, KEY_ESC, KEY_F1, KEY_F2, KEY_F3, KEY_F4, KEY_F5, KEY_F6, KEY_F7,     /* #1  */
    KEY_F8, KEY_F9, KEY_F10, KEY_F11, KEY_VOLUMEUP, KEY_VOLUMEDOWN, KEY_MUTE,   /*  -> */
    0, KEY_1, KEY_2, KEY_3, KEY_4, KEY_5, KEY_6, KEY_7, KEY_8, KEY_9,       /* #2  */
    KEY_0, KEY_MINUS, KEY_EQUAL,0, 0, 0,                        /*  -> */
    0, KEY_Q, KEY_W, KEY_E, KEY_R, KEY_T, KEY_Y, KEY_U, KEY_I, KEY_O,       /* #3  */
    KEY_P, KEY_BACKSLASH, KEY_BACKSPACE, 0, 0, 0,                   /*  -> */
    0, KEY_A, KEY_S, KEY_D, KEY_F, KEY_G, KEY_H, KEY_J, KEY_K, KEY_L,       /* #4  */
    KEY_SEMICOLON, KEY_LEFTBRACE, KEY_RIGHTBRACE, 0, 0, 0,              /*  -> */
    0, KEY_Z, KEY_X, KEY_C, KEY_V, KEY_B, KEY_N, KEY_M, KEY_COMMA,          /* #5  */
    KEY_DOT, KEY_KPMINUS, KEY_APOSTROPHE, KEY_ENTER, 0, 0,0,            /*  -> */
    0, KEY_TAB, 0, KEY_LEFTSHIFT, 0, KEY_APOSTROPHE, 0, 0, 0, 0,            /* #6  */
    KEY_UP, 0, KEY_RIGHTSHIFT, 0, 0, 0,0, 0, 0, 0, 0, KEY_LEFTALT, KEY_GRAVE,   /*  -> */
    0, 0, KEY_LEFT, KEY_DOWN, KEY_RIGHT, 0, 0, 0, 0,0, KEY_KPASTERISK,      /*  -> */
    KEY_LEFTCTRL, 0, KEY_SPACE, 0, 0, 0, KEY_SLASH, KEY_DELETE, 0, 0,       /*  -> */
    0, 0, 0, KEY_POWER,                             /*  -> */
};

struct jornadakbd {
    unsigned short keymap[ARRAY_SIZE(jornada_std_keymap)];
    struct input_dev *input;
};

static irqreturn_t jornada720_kbd_interrupt(int irq, void *dev_id)
{
    struct platform_device *pdev = dev_id;
    struct jornadakbd *jornadakbd = platform_get_drvdata(pdev);
    struct input_dev *input = jornadakbd->input;
    u8 count, kbd_data, scan_code;

    /* startup ssp with spinlock */
    jornada_ssp_start();

    if (jornada_ssp_inout(GETSCANKEYCODE) != TXDUMMY) {
        printk(KERN_DEBUG
            "jornada720_kbd: "
            "GetKeycode command failed with ETIMEDOUT, "
            "flushed bus\n");
    } else {
        /* How many keycodes are waiting for us? */
        count = jornada_ssp_byte(TXDUMMY);

        /* Lets drag them out one at a time */
        while (count--) {
            /* Exchange TxDummy for location (keymap[kbddata]) */
            kbd_data = jornada_ssp_byte(TXDUMMY);
            scan_code = kbd_data & 0x7f;

            input_event(input, EV_MSC, MSC_SCAN, scan_code);
            input_report_key(input, jornadakbd->keymap[scan_code],
                     !(kbd_data & 0x80));
            input_sync(input);
        }
    }

    /* release spinlock and turn off ssp */
    jornada_ssp_end();

    return IRQ_HANDLED;
};

static int __devinit jornada720_kbd_probe(struct platform_device *pdev)
{
    struct jornadakbd *jornadakbd;
    struct input_dev *input_dev;
    int i, err;

    jornadakbd = kzalloc(sizeof(struct jornadakbd), GFP_KERNEL);
    input_dev = input_allocate_device();
    if (!jornadakbd || !input_dev) {
        err = -ENOMEM;
        goto fail1;
    }

    platform_set_drvdata(pdev, jornadakbd);

    memcpy(jornadakbd->keymap, jornada_std_keymap,
        sizeof(jornada_std_keymap));
    jornadakbd->input = input_dev;

    input_dev->evbit[0] = BIT(EV_KEY) | BIT(EV_REP);
    input_dev->name = "HP Jornada 720 keyboard";
    input_dev->phys = "jornadakbd/input0";
    input_dev->keycode = jornadakbd->keymap;
    input_dev->keycodesize = sizeof(unsigned short);
    input_dev->keycodemax = ARRAY_SIZE(jornada_std_keymap);
    input_dev->id.bustype = BUS_HOST;
    input_dev->dev.parent = &pdev->dev;

    for (i = 0; i < ARRAY_SIZE(jornadakbd->keymap); i++)
        __set_bit(jornadakbd->keymap[i], input_dev->keybit);
    __clear_bit(KEY_RESERVED, input_dev->keybit);

    input_set_capability(input_dev, EV_MSC, MSC_SCAN);

    err = request_irq(IRQ_GPIO0,
              jornada720_kbd_interrupt,
              IRQF_TRIGGER_FALLING,
              "jornadakbd", pdev);
    if (err) {
        printk(KERN_INFO "jornadakbd720_kbd: Unable to grab IRQ\n");
        goto fail1;
    }

    err = input_register_device(jornadakbd->input);
    if (err)
        goto fail2;

    return 0;

 fail2: /* IRQ, DEVICE, MEMORY */
    free_irq(IRQ_GPIO0, pdev);
 fail1: /* DEVICE, MEMORY */
    platform_set_drvdata(pdev, NULL);
    input_free_device(input_dev);
    kfree(jornadakbd);
    return err;
};

static int __devexit jornada720_kbd_remove(struct platform_device *pdev)
{
    struct jornadakbd *jornadakbd = platform_get_drvdata(pdev);

    free_irq(IRQ_GPIO0, pdev);
    platform_set_drvdata(pdev, NULL);
    input_unregister_device(jornadakbd->input);
    kfree(jornadakbd);

    return 0;
}

/* work with hotplug and coldplug */
MODULE_ALIAS("platform:jornada720_kbd");

static struct platform_driver jornada720_kbd_driver = {
    .driver  = {
        .name    = "jornada720_kbd",
        .owner  = THIS_MODULE,
     },
    .probe   = jornada720_kbd_probe,
    .remove  = __devexit_p(jornada720_kbd_remove),
};
module_platform_driver(jornada720_kbd_driver);