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