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 */
  24 static int dvb_usb_af9005_remote_debug;
  25 module_param_named(debug, dvb_usb_af9005_remote_debug, int, 0644);
  26 MODULE_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
  32 struct 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
  73 int rc_map_af9005_table_size = ARRAY_SIZE(rc_map_af9005_table);
  74
  75 static int repeatable_keys[] = {
  76         KEY_VOLUMEUP,
  77         KEY_VOLUMEDOWN,
  78         KEY_CHANNELUP,
  79         KEY_CHANNELDOWN
  80 };
  81
  82 int 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
 145 EXPORT_SYMBOL(rc_map_af9005_table);
 146 EXPORT_SYMBOL(rc_map_af9005_table_size);
 147 EXPORT_SYMBOL(af9005_rc_decode);
 148
 149 MODULE_AUTHOR("Luca Olivetti <luca@ventoso.org>");
 150 MODULE_DESCRIPTION
 151     ("Standard remote control decoder for Afatech 9005 DVB-T USB1.1 stick");
 152 MODULE_VERSION("1.0");
 153 MODULE_LICENSE("GPL");