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