af9005-remote.c

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/* DVB USB compliant Linux driver for the Afatech 9005
 * USB1.1 DVB-T receiver.
 *
 * Standard remote decode function
 *
 * Copyright (C) 2007 Luca Olivetti ([email protected])
 *
 * Thanks to Afatech who kindly provided information.
 *
 * 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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * see Documentation/dvb/README.dvb-usb for more information
 */
#include "af9005.h"
/* debug */
static int dvb_usb_af9005_remote_debug;
module_param_named(debug, dvb_usb_af9005_remote_debug, int, 0644);
MODULE_PARM_DESC(debug,
         "enable (1) or disable (0) debug messages."
         DVB_USB_DEBUG_STATUS);

#define deb_decode(args...)   dprintk(dvb_usb_af9005_remote_debug,0x01,args)

struct rc_map_table rc_map_af9005_table[] = {

    {0x01b7, KEY_POWER},
    {0x01a7, KEY_VOLUMEUP},
    {0x0187, KEY_CHANNELUP},
    {0x017f, KEY_MUTE},
    {0x01bf, KEY_VOLUMEDOWN},
    {0x013f, KEY_CHANNELDOWN},
    {0x01df, KEY_1},
    {0x015f, KEY_2},
    {0x019f, KEY_3},
    {0x011f, KEY_4},
    {0x01ef, KEY_5},
    {0x016f, KEY_6},
    {0x01af, KEY_7},
    {0x0127, KEY_8},
    {0x0107, KEY_9},
    {0x01cf, KEY_ZOOM},
    {0x014f, KEY_0},
    {0x018f, KEY_GOTO}, /* marked jump on the remote */

    {0x00bd, KEY_POWER},
    {0x007d, KEY_VOLUMEUP},
    {0x00fd, KEY_CHANNELUP},
    {0x009d, KEY_MUTE},
    {0x005d, KEY_VOLUMEDOWN},
    {0x00dd, KEY_CHANNELDOWN},
    {0x00ad, KEY_1},
    {0x006d, KEY_2},
    {0x00ed, KEY_3},
    {0x008d, KEY_4},
    {0x004d, KEY_5},
    {0x00cd, KEY_6},
    {0x00b5, KEY_7},
    {0x0075, KEY_8},
    {0x00f5, KEY_9},
    {0x0095, KEY_ZOOM},
    {0x0055, KEY_0},
    {0x00d5, KEY_GOTO}, /* marked jump on the remote */
};

int rc_map_af9005_table_size = ARRAY_SIZE(rc_map_af9005_table);

static int repeatable_keys[] = {
    KEY_VOLUMEUP,
    KEY_VOLUMEDOWN,
    KEY_CHANNELUP,
    KEY_CHANNELDOWN
};

int af9005_rc_decode(struct dvb_usb_device *d, u8 * data, int len, u32 * event,
             int *state)
{
    u16 mark, space;
    u32 result;
    u8 cust, dat, invdat;
    int i;

    if (len >= 6) {
        mark = (u16) (data[0] << 8) + data[1];
        space = (u16) (data[2] << 8) + data[3];
        if (space * 3 < mark) {
            for (i = 0; i < ARRAY_SIZE(repeatable_keys); i++) {
                if (d->last_event == repeatable_keys[i]) {
                    *state = REMOTE_KEY_REPEAT;
                    *event = d->last_event;
                    deb_decode("repeat key, event %x\n",
                           *event);
                    return 0;
                }
            }
            deb_decode("repeated key ignored (non repeatable)\n");
            return 0;
        } else if (len >= 33 * 4) { /*32 bits + start code */
            result = 0;
            for (i = 4; i < 4 + 32 * 4; i += 4) {
                result <<= 1;
                mark = (u16) (data[i] << 8) + data[i + 1];
                mark >>= 1;
                space = (u16) (data[i + 2] << 8) + data[i + 3];
                space >>= 1;
                if (mark * 2 > space)
                    result += 1;
            }
            deb_decode("key pressed, raw value %x\n", result);
            if ((result & 0xff000000) != 0xfe000000) {
                deb_decode
                    ("doesn't start with 0xfe, ignored\n");
                return 0;
            }
            cust = (result >> 16) & 0xff;
            dat = (result >> 8) & 0xff;
            invdat = (~result) & 0xff;
            if (dat != invdat) {
                deb_decode("code != inverted code\n");
                return 0;
            }
            for (i = 0; i < rc_map_af9005_table_size; i++) {
                if (rc5_custom(&rc_map_af9005_table[i]) == cust
                    && rc5_data(&rc_map_af9005_table[i]) == dat) {
                    *event = rc_map_af9005_table[i].keycode;
                    *state = REMOTE_KEY_PRESSED;
                    deb_decode
                        ("key pressed, event %x\n", *event);
                    return 0;
                }
            }
            deb_decode("not found in table\n");
        }
    }
    return 0;
}

EXPORT_SYMBOL(rc_map_af9005_table);
EXPORT_SYMBOL(rc_map_af9005_table_size);
EXPORT_SYMBOL(af9005_rc_decode);

MODULE_AUTHOR("Luca Olivetti <[email protected]>");
MODULE_DESCRIPTION
    ("Standard remote control decoder for Afatech 9005 DVB-T USB1.1 stick");
MODULE_VERSION("1.0");
MODULE_LICENSE("GPL");