drivers/media/dvb/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  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  *
  24  * see Documentation/dvb/REDME.dvb-usb for more information
  25  */
  26 #include "af9005.h"
  27 /* debug */
  28 int dvb_usb_af9005_remote_debug;
  29 module_param_named(debug, dvb_usb_af9005_remote_debug, int, 0644);
  30 MODULE_PARM_DESC(debug,
  31                  "enable (1) or disable (0) debug messages."
  32                  DVB_USB_DEBUG_STATUS);
  33
  34 #define deb_decode(args...)   dprintk(dvb_usb_af9005_remote_debug,0x01,args)
  35
  36 struct dvb_usb_rc_key af9005_rc_keys[] = {
  37
  38         {0x01, 0xb7, KEY_POWER},
  39         {0x01, 0xa7, KEY_VOLUMEUP},
  40         {0x01, 0x87, KEY_CHANNELUP},
  41         {0x01, 0x7f, KEY_MUTE},
  42         {0x01, 0xbf, KEY_VOLUMEDOWN},
  43         {0x01, 0x3f, KEY_CHANNELDOWN},
  44         {0x01, 0xdf, KEY_1},
  45         {0x01, 0x5f, KEY_2},
  46         {0x01, 0x9f, KEY_3},
  47         {0x01, 0x1f, KEY_4},
  48         {0x01, 0xef, KEY_5},
  49         {0x01, 0x6f, KEY_6},
  50         {0x01, 0xaf, KEY_7},
  51         {0x01, 0x27, KEY_8},
  52         {0x01, 0x07, KEY_9},
  53         {0x01, 0xcf, KEY_ZOOM},
  54         {0x01, 0x4f, KEY_0},
  55         {0x01, 0x8f, KEY_GOTO}, /* marked jump on the remote */
  56
  57         {0x00, 0xbd, KEY_POWER},
  58         {0x00, 0x7d, KEY_VOLUMEUP},
  59         {0x00, 0xfd, KEY_CHANNELUP},
  60         {0x00, 0x9d, KEY_MUTE},
  61         {0x00, 0x5d, KEY_VOLUMEDOWN},
  62         {0x00, 0xdd, KEY_CHANNELDOWN},
  63         {0x00, 0xad, KEY_1},
  64         {0x00, 0x6d, KEY_2},
  65         {0x00, 0xed, KEY_3},
  66         {0x00, 0x8d, KEY_4},
  67         {0x00, 0x4d, KEY_5},
  68         {0x00, 0xcd, KEY_6},
  69         {0x00, 0xb5, KEY_7},
  70         {0x00, 0x75, KEY_8},
  71         {0x00, 0xf5, KEY_9},
  72         {0x00, 0x95, KEY_ZOOM},
  73         {0x00, 0x55, KEY_0},
  74         {0x00, 0xd5, KEY_GOTO}, /* marked jump on the remote */
  75 };
  76
  77 int af9005_rc_keys_size = ARRAY_SIZE(af9005_rc_keys);
  78
  79 static int repeatable_keys[] = {
  80         KEY_VOLUMEUP,
  81         KEY_VOLUMEDOWN,
  82         KEY_CHANNELUP,
  83         KEY_CHANNELDOWN
  84 };
  85
  86 int af9005_rc_decode(struct dvb_usb_device *d, u8 * data, int len, u32 * event,
  87                      int *state)
  88 {
  89         u16 mark, space;
  90         u32 result;
  91         u8 cust, dat, invdat;
  92         int i;
  93
  94         if (len >= 6) {
  95                 mark = (u16) (data[0] << 8) + data[1];
  96                 space = (u16) (data[2] << 8) + data[3];
  97                 if (space * 3 < mark) {
  98                         for (i = 0; i < ARRAY_SIZE(repeatable_keys); i++) {
  99                                 if (d->last_event == repeatable_keys[i]) {
 100                                         *state = REMOTE_KEY_REPEAT;
 101                                         *event = d->last_event;
 102                                         deb_decode("repeat key, event %x\n",
 103                                                    *event);
 104                                         return 0;
 105                                 }
 106                         }
 107                         deb_decode("repeated key ignored (non repeatable)\n");
 108                         return 0;
 109                 } else if (len >= 33 * 4) {     /*32 bits + start code */
 110                         result = 0;
 111                         for (i = 4; i < 4 + 32 * 4; i += 4) {
 112                                 result <<= 1;
 113                                 mark = (u16) (data[i] << 8) + data[i + 1];
 114                                 mark >>= 1;
 115                                 space = (u16) (data[i + 2] << 8) + data[i + 3];
 116                                 space >>= 1;
 117                                 if (mark * 2 > space)
 118                                         result += 1;
 119                         }
 120                         deb_decode("key pressed, raw value %x\n", result);
 121                         if ((result & 0xff000000) != 0xfe000000) {
 122                                 deb_decode
 123                                     ("doesn't start with 0xfe, ignored\n");
 124                                 return 0;
 125                         }
 126                         cust = (result >> 16) & 0xff;
 127                         dat = (result >> 8) & 0xff;
 128                         invdat = (~result) & 0xff;
 129                         if (dat != invdat) {
 130                                 deb_decode("code != inverted code\n");
 131                                 return 0;
 132                         }
 133                         for (i = 0; i < af9005_rc_keys_size; i++) {
 134                                 if (af9005_rc_keys[i].custom == cust
 135                                     && af9005_rc_keys[i].data == dat) {
 136                                         *event = af9005_rc_keys[i].event;
 137                                         *state = REMOTE_KEY_PRESSED;
 138                                         deb_decode
 139                                             ("key pressed, event %x\n", *event);
 140                                         return 0;
 141                                 }
 142                         }
 143                         deb_decode("not found in table\n");
 144                 }
 145         }
 146         return 0;
 147 }
 148
 149 EXPORT_SYMBOL(af9005_rc_keys);
 150 EXPORT_SYMBOL(af9005_rc_keys_size);
 151 EXPORT_SYMBOL(af9005_rc_decode);
 152
 153 MODULE_AUTHOR("Luca Olivetti <luca@ventoso.org>");
 154 MODULE_DESCRIPTION
 155     ("Standard remote control decoder for Afatech 9005 DVB-T USB1.1 stick");
 156 MODULE_VERSION("1.0");
 157 MODULE_LICENSE("GPL");