Dear Guennadi:
Thanks for you help,now I think I can send emails to
<[email protected]> .there is still one thing I can not
understand.The
question is in the end of this email.
> > > (3) There is a host only, so I think if there are two camera
> > > sensors,when one sensor is working,another sensor will be poweroff and
> > > can not be actived.The method to switch between them I think is to close
> > > the sensor which is not in use.
> > >
> > > Can you tell me whether the CEU can connect multiple sensors or not,If
> > > yes,are there some restrictions?
>
> It should work, yes. Currently soc-camera handles client devices (e.g.,
> sensors) in the following way: first during probing it attaches each such
> client device to the host, performs probing _and_ detaches it immediately.
> Then at open() the same happens - only the respective sensor is attached
> to the host, so, the CEU driver only has to deal with one sensor at a
> time. Just make sure to not try to open both nodes at the same time.
>
> > > If it supports multiple sensors ,what should I do?
>
> Just that - write two independent sensor drivers and two platform data
> blocks for them in your board file. Then open and operate each sensor
> independently. You also might want to provide platform struct
> soc_camera_link::power() and / or reset() callbacks.
You say soc_camera will attach each sensor in the probing,but I think
each time there is
only one sensor can register to soc_camera subsystem.look at the following
code:
struct i2c_board_info ov9640_info1=
{
....
};
struct soc_camera_link ov9640_link1=
{
.board_info=&ov9640_info1,
..........
};
struct platform_device ov9640_device1=
{
.name = "soc-camera-pdrv",
.dev=
{
.platform_data = &ov9640_link1,
}
};
struct i2c_board_info ov9640_info2=
{
....
};
struct soc_camera_link ov9640_link2=
{
.board_info=&ov9640_info2,
..........
};
struct platform_device ov9640_device2=
{
.name = "soc-camera-pdrv", //the name is same to the ov_9640_device1.
.dev=
{
.platform_data = &ov9640_link2,
}
};
There are two sensors,now I want they all exist in /dev after
linux system is
boot.can I do this? if yes I want to use platform_device_register()
twice.but this action is forbindden,because they have the same
platform name,so only one sensor can registered successfully.
On the other hand if I use soc_camera subsystem to register a
video device to let
system create a node in /dev,like /dev/video0 or /dev/video1.I must
call soc_camera_device_register() to register a soc_camera_device to
soc_camera,
then if there is a camera host is registered to soc_camera,the host
will call scan_add_host() to probe and attach each sensor,if host can
handle the sensor,
device_register() will be called,finally the probe function of
soc_camera bus------soc_camera_probe() will be called,in this function
a video device will be register to the system,and a device node will
be create in /dev if all information of the sensor is ok.
So if you want to register a video device and create a device
node in /dev using soc_camera,soc_camera_device_register() must be
called.But now the only way to call soc_camera_device_register() is
to register a platform device whose name is "soc-pdrv".
Is my analysis right ?
I do not want to use modle to load the driver,I want the two
sensors' device node can all exist in /dev directory after the system
is booted,what should I do.the kernel vesion I used is 2.6.36.Please
help me.
Thanks
LeMin.
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