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V4L/DVB (5575): Pvrusb2: Implement ability to disable IR receiver 

Anyone using multiple PVR USB2 devices really only want one of them
acting as the actual IR receiver.  

Implemented here is a new per-instance module option (ir_mode) which is 
a flag to enable the IR receiver.  The default is enabled.  

IR reception is disabled by blocking access to the IR receiver chip in 
the device.

Signed-off-by: Mike Isely <isely@pobox.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Mike Isely 2007-04-28 20:11:03 -03:00 committed by Mauro Carvalho Chehab
parent db71b7df76
commit 5c808e6417
1 changed files with 22 additions and 1 deletions
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23
drivers/media/video/pvrusb2/pvrusb2-i2c-core.c
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@ -23,6 +23,7 @@
#include "pvrusb2-hdw-internal.h"
#include "pvrusb2-debug.h"
#include "pvrusb2-fx2-cmd.h"
#include "pvrusb2.h"
#define trace_i2c(...) pvr2_trace(PVR2_TRACE_I2C,__VA_ARGS__)
@ -38,6 +39,10 @@ static unsigned int i2c_scan = 0;
module_param(i2c_scan, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(i2c_scan,"scan i2c bus at insmod time");
static int ir_mode[PVR_NUM] = { [0 ... PVR_NUM-1] = 1 };
module_param_array(ir_mode, int, NULL, 0444);
MODULE_PARM_DESC(ir_mode,"specify: 0=disable IR reception, 1=normal IR");
static unsigned int pvr2_i2c_client_describe(struct pvr2_i2c_client *cp,
unsigned int detail,
char *buf,unsigned int maxlen);
@ -273,6 +278,15 @@ static int i2c_hack_wm8775(struct pvr2_hdw *hdw,
return pvr2_i2c_basic_op(hdw,i2c_addr,wdata,wlen,rdata,rlen);
}
/* This is an entry point designed to always fail any attempt to perform a
transfer. We use this to cause certain I2C addresses to not be
probed. */
static int i2c_black_hole(struct pvr2_hdw *hdw,
u8 i2c_addr,u8 *wdata,u16 wlen,u8 *rdata,u16 rlen)
{
return -EIO;
}
/* This is a special entry point that is entered if an I2C operation is
attempted to a cx25840 chip on model 24xxx hardware. This chip can
sometimes wedge itself. Worse still, when this happens msp3400 can
@ -994,10 +1008,17 @@ void pvr2_i2c_core_init(struct pvr2_hdw *hdw)
}
/* However, deal with various special cases for 24xxx hardware. */
if (ir_mode[hdw->unit_number] == 0) {
printk(KERN_INFO "%s: IR disabled\n",hdw->name);
hdw->i2c_func[0x18] = i2c_black_hole;
} else if (ir_mode[hdw->unit_number] == 1) {
if (hdw->hdw_type == PVR2_HDW_TYPE_24XXX) {
hdw->i2c_func[0x18] = i2c_24xxx_ir;
}
}
if (hdw->hdw_type == PVR2_HDW_TYPE_24XXX) {
hdw->i2c_func[0x1b] = i2c_hack_wm8775;
hdw->i2c_func[0x44] = i2c_hack_cx25840;
hdw->i2c_func[0x18] = i2c_24xxx_ir;
}
// Configure the adapter and set up everything else related to it.