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

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /* DVB USB compliant Linux driver for the Afatech 9005
   3  * USB1.1 DVB-T receiver.
   4  *
   5  * Standard remote decode function
   6  *
   7  * Copyright (C) 2007 Luca Olivetti (luca@ventoso.org)
   8  *
   9  * Thanks to Afatech who kindly provided information.
  10  *
  11  * see Documentation/driver-api/media/drivers/dvb-usb.rst for more information
  12  */
  13 #include "af9005.h"
  14 /* debug */
  15 static int dvb_usb_af9005_remote_debug;
  16 module_param_named(debug, dvb_usb_af9005_remote_debug, int, 0644);
  17 MODULE_PARM_DESC(debug,
  18                  "enable (1) or disable (0) debug messages."
  19                  DVB_USB_DEBUG_STATUS);
  20
  21 #define deb_decode(args...)   dprintk(dvb_usb_af9005_remote_debug,0x01,args)
  22
  23 struct rc_map_table rc_map_af9005_table[] = {
  24
  25         {0x01b7, KEY_POWER},
  26         {0x01a7, KEY_VOLUMEUP},
  27         {0x0187, KEY_CHANNELUP},
  28         {0x017f, KEY_MUTE},
  29         {0x01bf, KEY_VOLUMEDOWN},
  30         {0x013f, KEY_CHANNELDOWN},
  31         {0x01df, KEY_1},
  32         {0x015f, KEY_2},
  33         {0x019f, KEY_3},
  34         {0x011f, KEY_4},
  35         {0x01ef, KEY_5},
  36         {0x016f, KEY_6},
  37         {0x01af, KEY_7},
  38         {0x0127, KEY_8},
  39         {0x0107, KEY_9},
  40         {0x01cf, KEY_ZOOM},
  41         {0x014f, KEY_0},
  42         {0x018f, KEY_GOTO},     /* marked jump on the remote */
  43
  44         {0x00bd, KEY_POWER},
  45         {0x007d, KEY_VOLUMEUP},
  46         {0x00fd, KEY_CHANNELUP},
  47         {0x009d, KEY_MUTE},
  48         {0x005d, KEY_VOLUMEDOWN},
  49         {0x00dd, KEY_CHANNELDOWN},
  50         {0x00ad, KEY_1},
  51         {0x006d, KEY_2},
  52         {0x00ed, KEY_3},
  53         {0x008d, KEY_4},
  54         {0x004d, KEY_5},
  55         {0x00cd, KEY_6},
  56         {0x00b5, KEY_7},
  57         {0x0075, KEY_8},
  58         {0x00f5, KEY_9},
  59         {0x0095, KEY_ZOOM},
  60         {0x0055, KEY_0},
  61         {0x00d5, KEY_GOTO},     /* marked jump on the remote */
  62 };
  63
  64 int rc_map_af9005_table_size = ARRAY_SIZE(rc_map_af9005_table);
  65
  66 static int repeatable_keys[] = {
  67         KEY_VOLUMEUP,
  68         KEY_VOLUMEDOWN,
  69         KEY_CHANNELUP,
  70         KEY_CHANNELDOWN
  71 };
  72
  73 int af9005_rc_decode(struct dvb_usb_device *d, u8 * data, int len, u32 * event,
  74                      int *state)
  75 {
  76         u16 mark, space;
  77         u32 result;
  78         u8 cust, dat, invdat;
  79         int i;
  80
  81         if (len >= 6) {
  82                 mark = (u16) (data[0] << 8) + data[1];
  83                 space = (u16) (data[2] << 8) + data[3];
  84                 if (space * 3 < mark) {
  85                         for (i = 0; i < ARRAY_SIZE(repeatable_keys); i++) {
  86                                 if (d->last_event == repeatable_keys[i]) {
  87                                         *state = REMOTE_KEY_REPEAT;
  88                                         *event = d->last_event;
  89                                         deb_decode("repeat key, event %x\n",
  90                                                    *event);
  91                                         return 0;
  92                                 }
  93                         }
  94                         deb_decode("repeated key ignored (non repeatable)\n");
  95                         return 0;
  96                 } else if (len >= 33 * 4) {     /*32 bits + start code */
  97                         result = 0;
  98                         for (i = 4; i < 4 + 32 * 4; i += 4) {
  99                                 result <<= 1;
 100                                 mark = (u16) (data[i] << 8) + data[i + 1];
 101                                 mark >>= 1;
 102                                 space = (u16) (data[i + 2] << 8) + data[i + 3];
 103                                 space >>= 1;
 104                                 if (mark * 2 > space)
 105                                         result += 1;
 106                         }
 107                         deb_decode("key pressed, raw value %x\n", result);
 108                         if ((result & 0xff000000) != 0xfe000000) {
 109                                 deb_decode
 110                                     ("doesn't start with 0xfe, ignored\n");
 111                                 return 0;
 112                         }
 113                         cust = (result >> 16) & 0xff;
 114                         dat = (result >> 8) & 0xff;
 115                         invdat = (~result) & 0xff;
 116                         if (dat != invdat) {
 117                                 deb_decode("code != inverted code\n");
 118                                 return 0;
 119                         }
 120                         for (i = 0; i < rc_map_af9005_table_size; i++) {
 121                                 if (rc5_custom(&rc_map_af9005_table[i]) == cust
 122                                     && rc5_data(&rc_map_af9005_table[i]) == dat) {
 123                                         *event = rc_map_af9005_table[i].keycode;
 124                                         *state = REMOTE_KEY_PRESSED;
 125                                         deb_decode
 126                                             ("key pressed, event %x\n", *event);
 127                                         return 0;
 128                                 }
 129                         }
 130                         deb_decode("not found in table\n");
 131                 }
 132         }
 133         return 0;
 134 }
 135
 136 EXPORT_SYMBOL(rc_map_af9005_table);
 137 EXPORT_SYMBOL(rc_map_af9005_table_size);
 138 EXPORT_SYMBOL(af9005_rc_decode);
 139
 140 MODULE_AUTHOR("Luca Olivetti <luca@ventoso.org>");
 141 MODULE_DESCRIPTION
 142     ("Standard remote control decoder for Afatech 9005 DVB-T USB1.1 stick");
 143 MODULE_VERSION("1.0");
 144 MODULE_LICENSE("GPL");