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");
145