// SPDX-License-Identifier: GPL-2.0-or-later
/* DVB USB compliant Linux driver for the Afatech 9005
 * USB1.1 DVB-T receiver.
 *
 * Standard remote decode function
 *
 * Copyright (C) 2007 Luca Olivetti (luca@ventoso.org)
 *
 * Thanks to Afatech who kindly provided information.
 *
 * see Documentation/driver-api/media/drivers/dvb-usb.rst 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 <luca@ventoso.org>");
MODULE_DESCRIPTION
    ("Standard remote control decoder for Afatech 9005 DVB-T USB1.1 stick");
MODULE_VERSION("1.0");
MODULE_LICENSE("GPL");