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/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
  34 static unsigned int disable_ir = 0;
  35 module_param(disable_ir, int, 0444);
  36 MODULE_PARM_DESC(disable_ir,"disable infrared remote support");
  37
  38 static unsigned int ir_debug = 0;
  39 module_param(ir_debug, int, 0644);
  40 MODULE_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
  47 static 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
  76 static 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
 107 static 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 /* ----------------------------------------------------------------------- */
 130 void 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  */