LXR linux/drivers/media/usb/dvb-usb/af9005-remote.c

   1/* DVB USB compliant Linux driver for the Afatech 9005
   2 * USB1.1 DVB-T receiver.
   3 *
   4 * Standard remote decode function
   5 *
   6 * Copyright (C) 2007 Luca Olivetti (luca@ventoso.org)
   7 *
   8 * Thanks to Afatech who kindly provided information.
   9 *
  10 * This program is free software; you can redistribute it and/or modify
  11 * it under the terms of the GNU General Public License as published by
  12 * the Free Software Foundation; either version 2 of the License, or
  13 * (at your option) any later version.
  14 *
  15 * This program is distributed in the hope that it will be useful,
  16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 * GNU General Public License for more details.
  19 *
  20 * see Documentation/dvb/README.dvb-usb for more information
  21 */
  22#include "af9005.h"
  23/* debug */
  24static int dvb_usb_af9005_remote_debug;
  25module_param_named(debug, dvb_usb_af9005_remote_debug, int, 0644);
  26MODULE_PARM_DESC(debug,
  27                 "enable (1) or disable (0) debug messages."
  28                 DVB_USB_DEBUG_STATUS);
  29
  30#define deb_decode(args...)   dprintk(dvb_usb_af9005_remote_debug,0x01,args)
  31
  32struct rc_map_table rc_map_af9005_table[] = {
  33
  34        {0x01b7, KEY_POWER},
  35        {0x01a7, KEY_VOLUMEUP},
  36        {0x0187, KEY_CHANNELUP},
  37        {0x017f, KEY_MUTE},
  38        {0x01bf, KEY_VOLUMEDOWN},
  39        {0x013f, KEY_CHANNELDOWN},
  40        {0x01df, KEY_1},
  41        {0x015f, KEY_2},
  42        {0x019f, KEY_3},
  43        {0x011f, KEY_4},
  44        {0x01ef, KEY_5},
  45        {0x016f, KEY_6},
  46        {0x01af, KEY_7},
  47        {0x0127, KEY_8},
  48        {0x0107, KEY_9},
  49        {0x01cf, KEY_ZOOM},
  50        {0x014f, KEY_0},
  51        {0x018f, KEY_GOTO},     /* marked jump on the remote */
  52
  53        {0x00bd, KEY_POWER},
  54        {0x007d, KEY_VOLUMEUP},
  55        {0x00fd, KEY_CHANNELUP},
  56        {0x009d, KEY_MUTE},
  57        {0x005d, KEY_VOLUMEDOWN},
  58        {0x00dd, KEY_CHANNELDOWN},
  59        {0x00ad, KEY_1},
  60        {0x006d, KEY_2},
  61        {0x00ed, KEY_3},
  62        {0x008d, KEY_4},
  63        {0x004d, KEY_5},
  64        {0x00cd, KEY_6},
  65        {0x00b5, KEY_7},
  66        {0x0075, KEY_8},
  67        {0x00f5, KEY_9},
  68        {0x0095, KEY_ZOOM},
  69        {0x0055, KEY_0},
  70        {0x00d5, KEY_GOTO},     /* marked jump on the remote */
  71};
  72
  73int rc_map_af9005_table_size = ARRAY_SIZE(rc_map_af9005_table);
  74
  75static int repeatable_keys[] = {
  76        KEY_VOLUMEUP,
  77        KEY_VOLUMEDOWN,
  78        KEY_CHANNELUP,
  79        KEY_CHANNELDOWN
  80};
  81
  82int af9005_rc_decode(struct dvb_usb_device *d, u8 * data, int len, u32 * event,
  83                     int *state)
  84{
  85        u16 mark, space;
  86        u32 result;
  87        u8 cust, dat, invdat;
  88        int i;
  89
  90        if (len >= 6) {
  91                mark = (u16) (data[0] << 8) + data[1];
  92                space = (u16) (data[2] << 8) + data[3];
  93                if (space * 3 < mark) {
  94                        for (i = 0; i < ARRAY_SIZE(repeatable_keys); i++) {
  95                                if (d->last_event == repeatable_keys[i]) {
  96                                        *state = REMOTE_KEY_REPEAT;
  97                                        *event = d->last_event;
  98                                        deb_decode("repeat key, event %x\n",
  99                                                   *event);
 100                                        return 0;
 101                                }
 102                        }
 103                        deb_decode("repeated key ignored (non repeatable)\n");
 104                        return 0;
 105                } else if (len >= 33 * 4) {     /*32 bits + start code */
 106                        result = 0;
 107                        for (i = 4; i < 4 + 32 * 4; i += 4) {
 108                                result <<= 1;
 109                                mark = (u16) (data[i] << 8) + data[i + 1];
 110                                mark >>= 1;
 111                                space = (u16) (data[i + 2] << 8) + data[i + 3];
 112                                space >>= 1;
 113                                if (mark * 2 > space)
 114                                        result += 1;
 115                        }
 116                        deb_decode("key pressed, raw value %x\n", result);
 117                        if ((result & 0xff000000) != 0xfe000000) {
 118                                deb_decode
 119                                    ("doesn't start with 0xfe, ignored\n");
 120                                return 0;
 121                        }
 122                        cust = (result >> 16) & 0xff;
 123                        dat = (result >> 8) & 0xff;
 124                        invdat = (~result) & 0xff;
 125                        if (dat != invdat) {
 126                                deb_decode("code != inverted code\n");
 127                                return 0;
 128                        }
 129                        for (i = 0; i < rc_map_af9005_table_size; i++) {
 130                                if (rc5_custom(&rc_map_af9005_table[i]) == cust
 131                                    && rc5_data(&rc_map_af9005_table[i]) == dat) {
 132                                        *event = rc_map_af9005_table[i].keycode;
 133                                        *state = REMOTE_KEY_PRESSED;
 134                                        deb_decode
 135                                            ("key pressed, event %x\n", *event);
 136                                        return 0;
 137                                }
 138                        }
 139                        deb_decode("not found in table\n");
 140                }
 141        }
 142        return 0;
 143}
 144
 145EXPORT_SYMBOL(rc_map_af9005_table);
 146EXPORT_SYMBOL(rc_map_af9005_table_size);
 147EXPORT_SYMBOL(af9005_rc_decode);
 148
 149MODULE_AUTHOR("Luca Olivetti <luca@ventoso.org>");
 150MODULE_DESCRIPTION
 151    ("Standard remote control decoder for Afatech 9005 DVB-T USB1.1 stick");
 152MODULE_VERSION("1.0");
 153MODULE_LICENSE("GPL");
 154