1 /* DVB USB compliant Linux driver for the Afatech 9005
2  * USB1.1 DVB-T receiver.
3  *
4  * Standard remote decode function
5  *
6  * Copyright (C) 2007 Luca Olivetti (luca@ventoso.org)
7  *
8  * Thanks to Afatech who kindly provided information.
9  *
10  * This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
18  * GNU General Public License for more details.
19  *
20  * see Documentation/dvb/README.dvb-usb for more information
21  */
22 #include "af9005.h"
23 /* debug */
24 static int dvb_usb_af9005_remote_debug;
25 module_param_named(debug, dvb_usb_af9005_remote_debug, int, 0644);
26 MODULE_PARM_DESC(debug,
27 		 "enable (1) or disable (0) debug messages."
28 		 DVB_USB_DEBUG_STATUS);
29 
30 #define deb_decode(args...)   dprintk(dvb_usb_af9005_remote_debug,0x01,args)
31 
32 struct rc_map_table rc_map_af9005_table[] = {
33 
34 	{0x01b7, KEY_POWER},
35 	{0x01a7, KEY_VOLUMEUP},
36 	{0x0187, KEY_CHANNELUP},
37 	{0x017f, KEY_MUTE},
38 	{0x01bf, KEY_VOLUMEDOWN},
39 	{0x013f, KEY_CHANNELDOWN},
40 	{0x01df, KEY_1},
41 	{0x015f, KEY_2},
42 	{0x019f, KEY_3},
43 	{0x011f, KEY_4},
44 	{0x01ef, KEY_5},
45 	{0x016f, KEY_6},
46 	{0x01af, KEY_7},
47 	{0x0127, KEY_8},
48 	{0x0107, KEY_9},
49 	{0x01cf, KEY_ZOOM},
50 	{0x014f, KEY_0},
51 	{0x018f, KEY_GOTO},	/* marked jump on the remote */
52 
53 	{0x00bd, KEY_POWER},
54 	{0x007d, KEY_VOLUMEUP},
55 	{0x00fd, KEY_CHANNELUP},
56 	{0x009d, KEY_MUTE},
57 	{0x005d, KEY_VOLUMEDOWN},
58 	{0x00dd, KEY_CHANNELDOWN},
59 	{0x00ad, KEY_1},
60 	{0x006d, KEY_2},
61 	{0x00ed, KEY_3},
62 	{0x008d, KEY_4},
63 	{0x004d, KEY_5},
64 	{0x00cd, KEY_6},
65 	{0x00b5, KEY_7},
66 	{0x0075, KEY_8},
67 	{0x00f5, KEY_9},
68 	{0x0095, KEY_ZOOM},
69 	{0x0055, KEY_0},
70 	{0x00d5, KEY_GOTO},	/* marked jump on the remote */
71 };
72 
73 int rc_map_af9005_table_size = ARRAY_SIZE(rc_map_af9005_table);
74 
75 static int repeatable_keys[] = {
76 	KEY_VOLUMEUP,
77 	KEY_VOLUMEDOWN,
78 	KEY_CHANNELUP,
79 	KEY_CHANNELDOWN
80 };
81 
82 int af9005_rc_decode(struct dvb_usb_device *d, u8 * data, int len, u32 * event,
83 		     int *state)
84 {
85 	u16 mark, space;
86 	u32 result;
87 	u8 cust, dat, invdat;
88 	int i;
89 
90 	if (len >= 6) {
91 		mark = (u16) (data[0] << 8) + data[1];
92 		space = (u16) (data[2] << 8) + data[3];
93 		if (space * 3 < mark) {
94 			for (i = 0; i < ARRAY_SIZE(repeatable_keys); i++) {
95 				if (d->last_event == repeatable_keys[i]) {
96 					*state = REMOTE_KEY_REPEAT;
97 					*event = d->last_event;
98 					deb_decode("repeat key, event %x\n",
99 						   *event);
100 					return 0;
101 				}
102 			}
103 			deb_decode("repeated key ignored (non repeatable)\n");
104 			return 0;
105 		} else if (len >= 33 * 4) {	/*32 bits + start code */
106 			result = 0;
107 			for (i = 4; i < 4 + 32 * 4; i += 4) {
108 				result <<= 1;
109 				mark = (u16) (data[i] << 8) + data[i + 1];
110 				mark >>= 1;
111 				space = (u16) (data[i + 2] << 8) + data[i + 3];
112 				space >>= 1;
113 				if (mark * 2 > space)
114 					result += 1;
115 			}
116 			deb_decode("key pressed, raw value %x\n", result);
117 			if ((result & 0xff000000) != 0xfe000000) {
118 				deb_decode
119 				    ("doesn't start with 0xfe, ignored\n");
120 				return 0;
121 			}
122 			cust = (result >> 16) & 0xff;
123 			dat = (result >> 8) & 0xff;
124 			invdat = (~result) & 0xff;
125 			if (dat != invdat) {
126 				deb_decode("code != inverted code\n");
127 				return 0;
128 			}
129 			for (i = 0; i < rc_map_af9005_table_size; i++) {
130 				if (rc5_custom(&rc_map_af9005_table[i]) == cust
131 				    && rc5_data(&rc_map_af9005_table[i]) == dat) {
132 					*event = rc_map_af9005_table[i].keycode;
133 					*state = REMOTE_KEY_PRESSED;
134 					deb_decode
135 					    ("key pressed, event %x\n", *event);
136 					return 0;
137 				}
138 			}
139 			deb_decode("not found in table\n");
140 		}
141 	}
142 	return 0;
143 }
144 
145 EXPORT_SYMBOL(rc_map_af9005_table);
146 EXPORT_SYMBOL(rc_map_af9005_table_size);
147 EXPORT_SYMBOL(af9005_rc_decode);
148 
149 MODULE_AUTHOR("Luca Olivetti <luca@ventoso.org>");
150 MODULE_DESCRIPTION
151     ("Standard remote control decoder for Afatech 9005 DVB-T USB1.1 stick");
152 MODULE_VERSION("1.0");
153 MODULE_LICENSE("GPL");
154