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@brturbo.com.br>
   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/sched.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/input.h>
  31 #include <linux/usb.h>
  32
  33 #include "em28xx.h"
  34
  35 static unsigned int disable_ir = 0;
  36 module_param(disable_ir, int, 0444);
  37 MODULE_PARM_DESC(disable_ir,"disable infrared remote support");
  38
  39 static unsigned int ir_debug = 0;
  40 module_param(ir_debug, int, 0644);
  41 MODULE_PARM_DESC(ir_debug,"enable debug messages [IR]");
  42
  43 #define dprintk(fmt, arg...)    if (ir_debug) \
  44         printk(KERN_DEBUG "%s/ir: " fmt, ir->c.name , ## arg)
  45
  46 /* ----------------------------------------------------------------------- */
  47
  48 static int get_key_terratec(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
  49 {
  50         unsigned char b;
  51
  52         /* poll IR chip */
  53         if (1 != i2c_master_recv(&ir->c,&b,1)) {
  54                 dprintk("read error\n");
  55                 return -EIO;
  56         }
  57
  58         /* it seems that 0xFE indicates that a button is still hold
  59            down, while 0xff indicates that no button is hold
  60            down. 0xfe sequences are sometimes interrupted by 0xFF */
  61
  62         dprintk("key %02x\n", b);
  63
  64         if (b == 0xff)
  65                 return 0;
  66
  67         if (b == 0xfe)
  68                 /* keep old data */
  69                 return 1;
  70
  71         *ir_key = b;
  72         *ir_raw = b;
  73         return 1;
  74 }
  75
  76
  77 static int get_key_em_haup(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
  78 {
  79         unsigned char buf[2];
  80         unsigned char code;
  81
  82         /* poll IR chip */
  83         if (2 != i2c_master_recv(&ir->c,buf,2))
  84                 return -EIO;
  85
  86         /* Does eliminate repeated parity code */
  87         if (buf[1]==0xff)
  88                 return 0;
  89
  90         ir->old=buf[1];
  91
  92         /* Rearranges bits to the right order */
  93         code=    ((buf[0]&0x01)<<5) | /* 0010 0000 */
  94                  ((buf[0]&0x02)<<3) | /* 0001 0000 */
  95                  ((buf[0]&0x04)<<1) | /* 0000 1000 */
  96                  ((buf[0]&0x08)>>1) | /* 0000 0100 */
  97                  ((buf[0]&0x10)>>3) | /* 0000 0010 */
  98                  ((buf[0]&0x20)>>5);  /* 0000 0001 */
  99
 100         dprintk("ir hauppauge (em2840): code=0x%02x (rcv=0x%02x)\n",code,buf[0]);
 101
 102         /* return key */
 103         *ir_key = code;
 104         *ir_raw = code;
 105         return 1;
 106 }
 107
 108 static int get_key_pinnacle_usb(struct IR_i2c *ir, u32 *ir_key, u32 *ir_raw)
 109 {
 110         unsigned char buf[3];
 111
 112         /* poll IR chip */
 113
 114         if (3 != i2c_master_recv(&ir->c,buf,3)) {
 115                 dprintk("read error\n");
 116                 return -EIO;
 117         }
 118
 119         dprintk("key %02x\n", buf[2]&0x3f);
 120         if (buf[0]!=0x00){
 121                 return 0;
 122         }
 123
 124         *ir_key = buf[2]&0x3f;
 125         *ir_raw = buf[2]&0x3f;
 126
 127         return 1;
 128 }
 129
 130 /* ----------------------------------------------------------------------- */
 131 void em28xx_set_ir(struct em28xx * dev,struct IR_i2c *ir)
 132 {
 133         if (disable_ir) {
 134                 ir->get_key=NULL;
 135                 return ;
 136         }
 137
 138         /* detect & configure */
 139         switch (dev->model) {
 140         case (EM2800_BOARD_UNKNOWN):
 141                 break;
 142         case (EM2820_BOARD_UNKNOWN):
 143                 break;
 144         case (EM2800_BOARD_TERRATEC_CINERGY_200):
 145         case (EM2820_BOARD_TERRATEC_CINERGY_250):
 146                 ir->ir_codes = ir_codes_em_terratec;
 147                 ir->get_key = get_key_terratec;
 148                 snprintf(ir->c.name, sizeof(ir->c.name), "i2c IR (EM28XX Terratec)");
 149                 break;
 150         case (EM2820_BOARD_PINNACLE_USB_2):
 151                 ir->ir_codes = ir_codes_em_pinnacle_usb;
 152                 ir->get_key = get_key_pinnacle_usb;
 153                 snprintf(ir->c.name, sizeof(ir->c.name), "i2c IR (EM28XX Pinnacle PCTV)");
 154                 break;
 155         case (EM2820_BOARD_HAUPPAUGE_WINTV_USB_2):
 156                 ir->ir_codes = ir_codes_hauppauge_new;
 157                 ir->get_key = get_key_em_haup;
 158                 snprintf(ir->c.name, sizeof(ir->c.name), "i2c IR (EM2840 Hauppauge)");
 159                 break;
 160         case (EM2820_BOARD_MSI_VOX_USB_2):
 161                 break;
 162         case (EM2800_BOARD_LEADTEK_WINFAST_USBII):
 163                 break;
 164         case (EM2800_BOARD_KWORLD_USB2800):
 165                 break;
 166         }
 167 }
 168
 169 /* ----------------------------------------------------------------------
 170  * Local variables:
 171  * c-basic-offset: 8
 172  * End:
 173  */