drivers/media/video/em28xx/em28xx-input.c

   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/init.h>
  26 #include <linux/delay.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/input.h>
  29 #include <linux/usb.h>
  30
  31 #include "em28xx.h"
  32
  33 static unsigned int ir_debug;
  34 module_param(ir_debug, int, 0644);
  35 MODULE_PARM_DESC(ir_debug,"enable debug messages [IR]");
  36
  37 #define dprintk(fmt, arg...)    if (ir_debug) \
  38         printk(KERN_DEBUG "%s/ir: " fmt, ir->c.name , ## arg)
  39
  40 /* ----------------------------------------------------------------------- */
  41
  42 int em28xx_get_key_terratec(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
  43 {
  44         unsigned char b;
  45
  46         /* poll IR chip */
  47         if (1 != i2c_master_recv(&ir->c,&b,1)) {
  48                 dprintk("read error\n");
  49                 return -EIO;
  50         }
  51
  52         /* it seems that 0xFE indicates that a button is still hold
  53            down, while 0xff indicates that no button is hold
  54            down. 0xfe sequences are sometimes interrupted by 0xFF */
  55
  56         dprintk("key %02x\n", b);
  57
  58         if (b == 0xff)
  59                 return 0;
  60
  61         if (b == 0xfe)
  62                 /* keep old data */
  63                 return 1;
  64
  65         *ir_key = b;
  66         *ir_raw = b;
  67         return 1;
  68 }
  69
  70
  71 int em28xx_get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
  72 {
  73         unsigned char buf[2];
  74         unsigned char code;
  75
  76         /* poll IR chip */
  77         if (2 != i2c_master_recv(&ir->c,buf,2))
  78                 return -EIO;
  79
  80         /* Does eliminate repeated parity code */
  81         if (buf[1]==0xff)
  82                 return 0;
  83
  84         ir->old=buf[1];
  85
  86         /* Rearranges bits to the right order */
  87         code=    ((buf[0]&0x01)<<5) | /* 0010 0000 */
  88                  ((buf[0]&0x02)<<3) | /* 0001 0000 */
  89                  ((buf[0]&0x04)<<1) | /* 0000 1000 */
  90                  ((buf[0]&0x08)>>1) | /* 0000 0100 */
  91                  ((buf[0]&0x10)>>3) | /* 0000 0010 */
  92                  ((buf[0]&0x20)>>5);  /* 0000 0001 */
  93
  94         dprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x)\n",code,buf[0]);
  95
  96         /* return key */
  97         *ir_key = code;
  98         *ir_raw = code;
  99         return 1;
 100 }
 101
 102 int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c *ir, u32 *ir_key,
 103                                      u32 *ir_raw)
 104 {
 105         unsigned char buf[3];
 106
 107         /* poll IR chip */
 108
 109         if (3 != i2c_master_recv(&ir->c,buf,3)) {
 110                 dprintk("read error\n");
 111                 return -EIO;
 112         }
 113
 114         dprintk("key %02x\n", buf[2]&0x3f);
 115         if (buf[0]!=0x00){
 116                 return 0;
 117         }
 118
 119         *ir_key = buf[2]&0x3f;
 120         *ir_raw = buf[2]&0x3f;
 121
 122         return 1;
 123 }
 124
 125 /* ----------------------------------------------------------------------
 126  * Local variables:
 127  * c-basic-offset: 8
 128  * End:
 129  */