cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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af9005-remote.c (3680B)

      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");