diff options
| author | Mike Isely <isely@pobox.com> | 2007-04-28 20:11:03 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@infradead.org> | 2007-05-09 10:12:34 -0300 |
| commit | 5c808e641741ecd7a7d5e65e38f740378d7406fc (patch) | |
| tree | 60a142f32e38d9e19fc8dc9c972ccd753e24a758 | |
| parent | db71b7df76dab261cc9f27525765211bd58345b1 (diff) | |
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>
| -rw-r--r-- | drivers/media/video/pvrusb2/pvrusb2-i2c-core.c | 23 |
1 files changed, 22 insertions, 1 deletions
diff --git a/drivers/media/video/pvrusb2/pvrusb2-i2c-core.c b/drivers/media/video/pvrusb2/pvrusb2-i2c-core.c index 58fc3c730fe1..6786d3c0c98b 100644 --- a/drivers/media/video/pvrusb2/pvrusb2-i2c-core.c +++ b/drivers/media/video/pvrusb2/pvrusb2-i2c-core.c @@ -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. |