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jornada720_kbd.c

/*
 * drivers/input/keyboard/jornada720_kbd.c
 *
 * HP Jornada 720 keyboard platform driver
 *
 * Copyright (C) 2006/2007 Kristoffer Ericson <Kristoffer.Ericson@Gmail.com>
 *
 *    Copyright (C) 2006 jornada 720 kbd driver by
            Filip Zyzniewsk <Filip.Zyzniewski@tefnet.plX
 *     based on (C) 2004 jornada 720 kbd driver by
            Alex Lange <chicken@handhelds.org>
 *
 * 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/init.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 <asm/arch/jornada720.h>
#include <asm/hardware.h>

MODULE_AUTHOR("Kristoffer Ericson <Kristoffer.Ericson@gmail.com>");
MODULE_DESCRIPTION("HP Jornada 710/720/728 keyboard driver");
MODULE_LICENSE("GPLv2");

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_DISABLED | 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;
}

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

static int __init jornada720_kbd_init(void)
{
      return platform_driver_register(&jornada720_kbd_driver);
}

static void __exit jornada720_kbd_exit(void)
{
      platform_driver_unregister(&jornada720_kbd_driver);
}

module_init(jornada720_kbd_init);
module_exit(jornada720_kbd_exit);

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