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...) \
  38         if (ir_debug) { \
  39                 printk(KERN_DEBUG "%s/ir: " fmt, ir->c.name , ## arg); \
  40         }
  41
  42 /* ----------------------------------------------------------------------- */
  43
  44 int em28xx_get_key_terratec(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
  45 {
  46         unsigned char b;
  47
  48         /* poll IR chip */
  49         if (1 != i2c_master_recv(&ir->c, &b, 1)) {
  50                 dprintk("read error\n");
  51                 return -EIO;
  52         }
  53
  54         /* it seems that 0xFE indicates that a button is still hold
  55            down, while 0xff indicates that no button is hold
  56            down. 0xfe sequences are sometimes interrupted by 0xFF */
  57
  58         dprintk("key %02x\n", b);
  59
  60         if (b == 0xff)
  61                 return 0;
  62
  63         if (b == 0xfe)
  64                 /* keep old data */
  65                 return 1;
  66
  67         *ir_key = b;
  68         *ir_raw = b;
  69         return 1;
  70 }
  71
  72
  73 int em28xx_get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
  74 {
  75         unsigned char buf[2];
  76         unsigned char code;
  77
  78         /* poll IR chip */
  79         if (2 != i2c_master_recv(&ir->c, buf, 2))
  80                 return -EIO;
  81
  82         /* Does eliminate repeated parity code */
  83         if (buf[1] == 0xff)
  84                 return 0;
  85
  86         ir->old = buf[1];
  87
  88         /* Rearranges bits to the right order */
  89         code =   ((buf[0]&0x01)<<5) | /* 0010 0000 */
  90                  ((buf[0]&0x02)<<3) | /* 0001 0000 */
  91                  ((buf[0]&0x04)<<1) | /* 0000 1000 */
  92                  ((buf[0]&0x08)>>1) | /* 0000 0100 */
  93                  ((buf[0]&0x10)>>3) | /* 0000 0010 */
  94                  ((buf[0]&0x20)>>5);  /* 0000 0001 */
  95
  96         dprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x)\n",
  97                         code, buf[0]);
  98
  99         /* return key */
 100         *ir_key = code;
 101         *ir_raw = code;
 102         return 1;
 103 }
 104
 105 int em28xx_get_key_pinnacle_usb_grey(struct IR_i2c *ir, u32 *ir_key,
 106                                      u32 *ir_raw)
 107 {
 108         unsigned char buf[3];
 109
 110         /* poll IR chip */
 111
 112         if (3 != i2c_master_recv(&ir->c, buf, 3)) {
 113                 dprintk("read error\n");
 114                 return -EIO;
 115         }
 116
 117         dprintk("key %02x\n", buf[2]&0x3f);
 118         if (buf[0] != 0x00)
 119                 return 0;
 120
 121         *ir_key = buf[2]&0x3f;
 122         *ir_raw = buf[2]&0x3f;
 123
 124         return 1;
 125 }
 126
 127 /* ----------------------------------------------------------------------
 128  * Local variables:
 129  * c-basic-offset: 8
 130  * End:
 131  */