LXR linux/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 */
  28static int dvb_usb_af9005_remote_debug;
  29module_param_named(debug, dvb_usb_af9005_remote_debug, int, 0644);
  30MODULE_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
  36struct dvb_usb_rc_key af9005_rc_keys[] = {
  37
  38        {0x01b7, KEY_POWER},
  39        {0x01a7, KEY_VOLUMEUP},
  40        {0x0187, KEY_CHANNELUP},
  41        {0x017f, KEY_MUTE},
  42        {0x01bf, KEY_VOLUMEDOWN},
  43        {0x013f, KEY_CHANNELDOWN},
  44        {0x01df, KEY_1},
  45        {0x015f, KEY_2},
  46        {0x019f, KEY_3},
  47        {0x011f, KEY_4},
  48        {0x01ef, KEY_5},
  49        {0x016f, KEY_6},
  50        {0x01af, KEY_7},
  51        {0x0127, KEY_8},
  52        {0x0107, KEY_9},
  53        {0x01cf, KEY_ZOOM},
  54        {0x014f, KEY_0},
  55        {0x018f, KEY_GOTO},     /* marked jump on the remote */
  56
  57        {0x00bd, KEY_POWER},
  58        {0x007d, KEY_VOLUMEUP},
  59        {0x00fd, KEY_CHANNELUP},
  60        {0x009d, KEY_MUTE},
  61        {0x005d, KEY_VOLUMEDOWN},
  62        {0x00dd, KEY_CHANNELDOWN},
  63        {0x00ad, KEY_1},
  64        {0x006d, KEY_2},
  65        {0x00ed, KEY_3},
  66        {0x008d, KEY_4},
  67        {0x004d, KEY_5},
  68        {0x00cd, KEY_6},
  69        {0x00b5, KEY_7},
  70        {0x0075, KEY_8},
  71        {0x00f5, KEY_9},
  72        {0x0095, KEY_ZOOM},
  73        {0x0055, KEY_0},
  74        {0x00d5, KEY_GOTO},     /* marked jump on the remote */
  75};
  76
  77int af9005_rc_keys_size = ARRAY_SIZE(af9005_rc_keys);
  78
  79static int repeatable_keys[] = {
  80        KEY_VOLUMEUP,
  81        KEY_VOLUMEDOWN,
  82        KEY_CHANNELUP,
  83        KEY_CHANNELDOWN
  84};
  85
  86int 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 (rc5_custom(&af9005_rc_keys[i]) == cust
 135                                    && rc5_data(&af9005_rc_keys[i]) == 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
 149EXPORT_SYMBOL(af9005_rc_keys);
 150EXPORT_SYMBOL(af9005_rc_keys_size);
 151EXPORT_SYMBOL(af9005_rc_decode);
 152
 153MODULE_AUTHOR("Luca Olivetti <luca@ventoso.org>");
 154MODULE_DESCRIPTION
 155    ("Standard remote control decoder for Afatech 9005 DVB-T USB1.1 stick");
 156MODULE_VERSION("1.0");
 157MODULE_LICENSE("GPL");
 158