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");