1/*
2  handle em28xx IR remotes via linux kernel input layer.
3
4   Copyright (C) 2005 Ludovico Cavedon <cavedon@sssup.it>
5		      Markus Rechberger <mrechberger@gmail.com>
6		      Mauro Carvalho Chehab <mchehab@infradead.org>
7		      Sascha Sommer <saschasommer@freenet.de>
8
9  This program is free software; you can redistribute it and/or modify
10  it under the terms of the GNU General Public License as published by
11  the Free Software Foundation; either version 2 of the License, or
12  (at your option) any later version.
13
14  This program is distributed in the hope that it will be useful,
15  but WITHOUT ANY WARRANTY; without even the implied warranty of
16  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17  GNU General Public License for more details.
18
19  You should have received a copy of the GNU General Public License
20  along with this program; if not, write to the Free Software
21  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
22 */
23
24#include <linux/module.h>
25#include <linux/moduleparam.h>
26#include <linux/init.h>
27#include <linux/delay.h>
28#include <linux/interrupt.h>
29#include <linux/input.h>
30#include <linux/usb.h>
31
32#include "em28xx.h"
33
34static unsigned int disable_ir = 0;
35module_param(disable_ir, int, 0444);
36MODULE_PARM_DESC(disable_ir,"disable infrared remote support");
37
38static unsigned int ir_debug = 0;
39module_param(ir_debug, int, 0644);
40MODULE_PARM_DESC(ir_debug,"enable debug messages [IR]");
41
42#define dprintk(fmt, arg...)	if (ir_debug) \
43	printk(KERN_DEBUG "%s/ir: " fmt, ir->c.name , ## arg)
44
45/* ----------------------------------------------------------------------- */
46
47static int get_key_terratec(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
48{
49	unsigned char b;
50
51	/* poll IR chip */
52	if (1 != i2c_master_recv(&ir->c,&b,1)) {
53		dprintk("read error\n");
54		return -EIO;
55	}
56
57	/* it seems that 0xFE indicates that a button is still hold
58	   down, while 0xff indicates that no button is hold
59	   down. 0xfe sequences are sometimes interrupted by 0xFF */
60
61	dprintk("key %02x\n", b);
62
63	if (b == 0xff)
64		return 0;
65
66	if (b == 0xfe)
67		/* keep old data */
68		return 1;
69
70	*ir_key = b;
71	*ir_raw = b;
72	return 1;
73}
74
75
76static int get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
77{
78	unsigned char buf[2];
79	unsigned char code;
80
81	/* poll IR chip */
82	if (2 != i2c_master_recv(&ir->c,buf,2))
83		return -EIO;
84
85	/* Does eliminate repeated parity code */
86	if (buf[1]==0xff)
87		return 0;
88
89	ir->old=buf[1];
90
91	/* Rearranges bits to the right order */
92	code=    ((buf[0]&0x01)<<5) | /* 0010 0000 */
93		 ((buf[0]&0x02)<<3) | /* 0001 0000 */
94		 ((buf[0]&0x04)<<1) | /* 0000 1000 */
95		 ((buf[0]&0x08)>>1) | /* 0000 0100 */
96		 ((buf[0]&0x10)>>3) | /* 0000 0010 */
97		 ((buf[0]&0x20)>>5);  /* 0000 0001 */
98
99	dprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x)\n",code,buf[0]);
100
101	/* return key */
102	*ir_key = code;
103	*ir_raw = code;
104	return 1;
105}
106
107static int get_key_pinnacle_usb_grey(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
108{
109	unsigned char buf[3];
110
111	/* poll IR chip */
112
113	if (3 != i2c_master_recv(&ir->c,buf,3)) {
114		dprintk("read error\n");
115		return -EIO;
116	}
117
118	dprintk("key %02x\n", buf[2]&0x3f);
119	if (buf[0]!=0x00){
120		return 0;
121	}
122
123	*ir_key = buf[2]&0x3f;
124	*ir_raw = buf[2]&0x3f;
125
126	return 1;
127}
128
129/* ----------------------------------------------------------------------- */
130void em28xx_set_ir(struct em28xx * dev,struct IR_i2c *ir)
131{
132	if (disable_ir) {
133		ir->get_key=NULL;
134		return ;
135	}
136
137	/* detect & configure */
138	switch (dev->model) {
139	case (EM2800_BOARD_UNKNOWN):
140		break;
141	case (EM2820_BOARD_UNKNOWN):
142		break;
143	case (EM2800_BOARD_TERRATEC_CINERGY_200):
144	case (EM2820_BOARD_TERRATEC_CINERGY_250):
145		ir->ir_codes = ir_codes_em_terratec;
146		ir->get_key = get_key_terratec;
147		snprintf(ir->c.name, sizeof(ir->c.name), "i2c IR (EM28XX Terratec)");
148		break;
149	case (EM2820_BOARD_PINNACLE_USB_2):
150		ir->ir_codes = ir_codes_pinnacle_grey;
151		ir->get_key = get_key_pinnacle_usb_grey;
152		snprintf(ir->c.name, sizeof(ir->c.name), "i2c IR (EM28XX Pinnacle PCTV)");
153		break;
154	case (EM2820_BOARD_HAUPPAUGE_WINTV_USB_2):
155		ir->ir_codes = ir_codes_hauppauge_new;
156		ir->get_key = get_key_em_haup;
157		snprintf(ir->c.name, sizeof(ir->c.name), "i2c IR (EM2840 Hauppauge)");
158		break;
159	case (EM2820_BOARD_MSI_VOX_USB_2):
160		break;
161	case (EM2800_BOARD_LEADTEK_WINFAST_USBII):
162		break;
163	case (EM2800_BOARD_KWORLD_USB2800):
164		break;
165	}
166}
167
168/* ----------------------------------------------------------------------
169 * Local variables:
170 * c-basic-offset: 8
171 * End:
172 */
173