LXR linux/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 */
  15static int dvb_usb_af9005_remote_debug;
  16module_param_named(debug, dvb_usb_af9005_remote_debug, int, 0644);
  17MODULE_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
  23struct 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
  64int rc_map_af9005_table_size = ARRAY_SIZE(rc_map_af9005_table);
  65
  66static int repeatable_keys[] = {
  67        KEY_VOLUMEUP,
  68        KEY_VOLUMEDOWN,
  69        KEY_CHANNELUP,
  70        KEY_CHANNELDOWN
  71};
  72
  73int 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
 136EXPORT_SYMBOL(rc_map_af9005_table);
 137EXPORT_SYMBOL(rc_map_af9005_table_size);
 138EXPORT_SYMBOL(af9005_rc_decode);
 139
 140MODULE_AUTHOR("Luca Olivetti <luca@ventoso.org>");
 141MODULE_DESCRIPTION
 142    ("Standard remote control decoder for Afatech 9005 DVB-T USB1.1 stick");
 143MODULE_VERSION("1.0");
 144MODULE_LICENSE("GPL");
 145