linux-kernel - Input driver for Twinhan USB 6253:0100 remote control

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Date:	Wed, 08 Apr 2009 13:28:09 -0400
From:	Mark Lord <lkml@....ca>
To:	Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-input@...r.kernel.org
Subject: Input driver for Twinhan USB 6253:0100 remote control 

Dmitry,

I briefly had access to a Twinhan remote control (for Mythtv et al.)
and cobbled something together quickly to make it work.

But I really don't understand the new hid/input stuff,
so this is undoubtedly a total abomination to your eyes. :)

But if somebody could give *exact* and *detailed* instructions as
to what to do to make it "fit" the new model better, then I may still
have time (before I have to return it) to clean things up enough.

I don't want to hear about 80-column limits,
but rather how to properly integrate this into
the newly refurbished hid stuff. 

Have a look.  Currently it's just this single source file,
which has to be loaded before usbhid (not on the quirks list there yet).



/*
 *  HID driver for Twinhan remote control
 *
 *  Copyright (c) 2009 Mark Lord
 *
 * 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.
 */

#include <linux/device.h>
#include <linux/input.h>
#include <linux/hid.h>
#include <linux/module.h>

#ifndef HID_USB_DEVICE
#error "This driver requires a 2.6.28 (or higher) Linux kernel"
#endif

/* See /usr/include/linux/input.h for all possible KEY_* definitions */

static unsigned int twinhan_keymap (unsigned int key)
{
	switch (key) {
	case 0x04: key = KEY_RESERVED   ; break; // Teletext	()
	case 0x06: key = KEY_ESC        ; break; // Recall	(myth Escape/Cancel/Back)
	case 0x08: key = KEY_S          ; break; // EPG		(myth guide)
	case 0x0c: key = KEY_HOME       ; break; // Rewind	(myth commskip back)
	case 0x0e: key = KEY_P          ; break; // Preview	(myth playback)
	case 0x0f: key = KEY_F3         ; break; // RecordList	(myth DVD root menu)
	case 0x10: key = KEY_F9         ; break; // Mute	(myth mute ??)
	case 0x11: key = KEY_END        ; break; // Forward	(myth commskip forward)
	case 0x13: key = KEY_RESERVED   ; break; // Capture	()
	case 0x17: key = KEY_P          ; break; // Pause	(myth Pause)
	case 0x19: key = KEY_M          ; break; // Favorite	(myth Menu)
	case 0x1d: key = KEY_W          ; break; // FullScreen	(myth aspect ratio zoom)
	case 0x1e: key = KEY_1          ; break; // 1		(myth 1)
	case 0x1f: key = KEY_2          ; break; // 2		(myth 2)
	case 0x20: key = KEY_3          ; break; // 3		(myth 3)
	case 0x21: key = KEY_4          ; break; // 4		(myth 4)
	case 0x22: key = KEY_5          ; break; // 5		(myth 5)
	case 0x23: key = KEY_6          ; break; // 6		(myth 6)
	case 0x24: key = KEY_7          ; break; // 7		(myth 7)
	case 0x25: key = KEY_8          ; break; // 8		(myth 8)
	case 0x26: key = KEY_9          ; break; // 9		(myth 9)
	case 0x27: key = KEY_0          ; break; // 0		(myth 0)
	case 0x29: key = KEY_ESC        ; break; // Cancel	(myth Escape/Cancel/Back)
	case 0x28: key = KEY_ENTER      ; break; // Play	(myth Okay/Play)
	case 0x2b: key = KEY_RESERVED   ; break; // Tab		()
	case 0x3f: key = KEY_F2         ; break; // Power	(myth function key 2)
	case 0x4a: key = KEY_R          ; break; // Record	(myth record)
	case 0x4b: key = KEY_UP         ; break; // Up/CH+	(myth up)
	case 0x4d: key = KEY_B          ; break; // Stop	(myth adjust audio sync)
	case 0x4e: key = KEY_DOWN       ; break; // Down/CH-	(myth down)
	case 0x51: key = KEY_LEFT       ; break; // Left/VOL-	(myth left)
	case 0x52: key = KEY_RIGHT      ; break; // Right/VOL+	(myth right)
	//case 0xe0:	// excess code from Power button
	//case 0xe1:	// excess code from Power,Left,Right buttons
	//case 0xe2:	// excess code from Power button
	//case 0xef:	// excess code from Power button
	default:   key = KEY_RESERVED   ; break; // ignored
	}
	return key;
}

static int twinhan_event(struct hid_device *hdev, struct hid_field *field,
			 struct hid_usage *usage, __s32 value)
{
	struct input_dev *input = field->hidinput->input;
	static unsigned int last_key = 0;
	unsigned int key;
	int ret = 0;

	if (!(hdev->claimed & HID_CLAIMED_INPUT) || !field->hidinput || !usage->type)
		return 0;
	if ((usage->hid & HID_USAGE_PAGE) != HID_UP_KEYBOARD)
		return 0;

	if (last_key) {
		input_event(input, usage->type, last_key, 0);
		last_key = 0;
		ret = 1;
	}
	if (value) {
		unsigned int val = usage->hid & HID_USAGE;
		key = twinhan_keymap(val);
		if (key) {
			input_event(input, usage->type, key, 1);
			last_key = key;
		}
		ret = 1;
	}
	return ret;
}

static const struct hid_device_id twinhan_devices[] = {
	{ HID_USB_DEVICE(0x6253, 0x0100) },
	{ }
};
MODULE_DEVICE_TABLE(hid, twinhan_devices);

static struct hid_driver twinhan_driver = {
	.name		= "twinhan",
	.id_table	= twinhan_devices,
	.event		= twinhan_event,
};

static int twinhan_init(void)
{
	return hid_register_driver(&twinhan_driver);
}

static void twinhan_exit(void)
{
	hid_unregister_driver(&twinhan_driver);
}

module_init(twinhan_init);
module_exit(twinhan_exit);
MODULE_LICENSE("GPL");
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