/drivers/media/dvb/dvb-usb/af9005-remote.c

  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 * You should have received a copy of the GNU General Public License
 21 * along with this program; if not, write to the Free Software
 22 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 23 *
 24 * see Documentation/dvb/REDME.dvb-usb for more information
 25 */
 26#include "af9005.h"
 27/* debug */
 28static int dvb_usb_af9005_remote_debug;
 29module_param_named(debug, dvb_usb_af9005_remote_debug, int, 0644);
 30MODULE_PARM_DESC(debug,
 31		 "enable (1) or disable (0) debug messages."
 32		 DVB_USB_DEBUG_STATUS);
 33
 34#define deb_decode(args...)   dprintk(dvb_usb_af9005_remote_debug,0x01,args)
 35
 36struct dvb_usb_rc_key af9005_rc_keys[] = {
 37
 38	{0x01b7, KEY_POWER},
 39	{0x01a7, KEY_VOLUMEUP},
 40	{0x0187, KEY_CHANNELUP},
 41	{0x017f, KEY_MUTE},
 42	{0x01bf, KEY_VOLUMEDOWN},
 43	{0x013f, KEY_CHANNELDOWN},
 44	{0x01df, KEY_1},
 45	{0x015f, KEY_2},
 46	{0x019f, KEY_3},
 47	{0x011f, KEY_4},
 48	{0x01ef, KEY_5},
 49	{0x016f, KEY_6},
 50	{0x01af, KEY_7},
 51	{0x0127, KEY_8},
 52	{0x0107, KEY_9},
 53	{0x01cf, KEY_ZOOM},
 54	{0x014f, KEY_0},
 55	{0x018f, KEY_GOTO},	/* marked jump on the remote */
 56
 57	{0x00bd, KEY_POWER},
 58	{0x007d, KEY_VOLUMEUP},
 59	{0x00fd, KEY_CHANNELUP},
 60	{0x009d, KEY_MUTE},
 61	{0x005d, KEY_VOLUMEDOWN},
 62	{0x00dd, KEY_CHANNELDOWN},
 63	{0x00ad, KEY_1},
 64	{0x006d, KEY_2},
 65	{0x00ed, KEY_3},
 66	{0x008d, KEY_4},
 67	{0x004d, KEY_5},
 68	{0x00cd, KEY_6},
 69	{0x00b5, KEY_7},
 70	{0x0075, KEY_8},
 71	{0x00f5, KEY_9},
 72	{0x0095, KEY_ZOOM},
 73	{0x0055, KEY_0},
 74	{0x00d5, KEY_GOTO},	/* marked jump on the remote */
 75};
 76
 77int af9005_rc_keys_size = ARRAY_SIZE(af9005_rc_keys);
 78
 79static int repeatable_keys[] = {
 80	KEY_VOLUMEUP,
 81	KEY_VOLUMEDOWN,
 82	KEY_CHANNELUP,
 83	KEY_CHANNELDOWN
 84};
 85
 86int af9005_rc_decode(struct dvb_usb_device *d, u8 * data, int len, u32 * event,
 87		     int *state)
 88{
 89	u16 mark, space;
 90	u32 result;
 91	u8 cust, dat, invdat;
 92	int i;
 93
 94	if (len >= 6) {
 95		mark = (u16) (data[0] << 8) + data[1];
 96		space = (u16) (data[2] << 8) + data[3];
 97		if (space * 3 < mark) {
 98			for (i = 0; i < ARRAY_SIZE(repeatable_keys); i++) {
 99				if (d->last_event == repeatable_keys[i]) {
100					*state = REMOTE_KEY_REPEAT;
101					*event = d->last_event;
102					deb_decode("repeat key, event %x\n",
103						   *event);
104					return 0;
105				}
106			}
107			deb_decode("repeated key ignored (non repeatable)\n");
108			return 0;
109		} else if (len >= 33 * 4) {	/*32 bits + start code */
110			result = 0;
111			for (i = 4; i < 4 + 32 * 4; i += 4) {
112				result <<= 1;
113				mark = (u16) (data[i] << 8) + data[i + 1];
114				mark >>= 1;
115				space = (u16) (data[i + 2] << 8) + data[i + 3];
116				space >>= 1;
117				if (mark * 2 > space)
118					result += 1;
119			}
120			deb_decode("key pressed, raw value %x\n", result);
121			if ((result & 0xff000000) != 0xfe000000) {
122				deb_decode
123				    ("doesn't start with 0xfe, ignored\n");
124				return 0;
125			}
126			cust = (result >> 16) & 0xff;
127			dat = (result >> 8) & 0xff;
128			invdat = (~result) & 0xff;
129			if (dat != invdat) {
130				deb_decode("code != inverted code\n");
131				return 0;
132			}
133			for (i = 0; i < af9005_rc_keys_size; i++) {
134				if (rc5_custom(&af9005_rc_keys[i]) == cust
135				    && rc5_data(&af9005_rc_keys[i]) == dat) {
136					*event = af9005_rc_keys[i].event;
137					*state = REMOTE_KEY_PRESSED;
138					deb_decode
139					    ("key pressed, event %x\n", *event);
140					return 0;
141				}
142			}
143			deb_decode("not found in table\n");
144		}
145	}
146	return 0;
147}
148
149EXPORT_SYMBOL(af9005_rc_keys);
150EXPORT_SYMBOL(af9005_rc_keys_size);
151EXPORT_SYMBOL(af9005_rc_decode);
152
153MODULE_AUTHOR("Luca Olivetti <luca@ventoso.org>");
154MODULE_DESCRIPTION
155    ("Standard remote control decoder for Afatech 9005 DVB-T USB1.1 stick");
156MODULE_VERSION("1.0");
157MODULE_LICENSE("GPL");