communication with i2c client

communication with i2c client

[Ladislav Klenovič]

Hi,
I've create an i2c client and my questions is how to access it from use=
rspace=2E This client is sitttng on adapter that  I was able to access =
via /dev interface=2E After the client were successfuly loaded and dete=
cted,
ioctl(fd,I2C_SLAVE,=2E=2E=2E) and read/write functions didn't work and =
 error messages like "device busy" or "ioctl error" have occured=2E Als=
o my debug messages from i2c client didn't arise when I am accessing=20
device only adapter's=2E
How to (standardly) access a an i2c client?=20
Do I need to create an ioctl interface or exports some helper function =
for access it from user space and also from kernel space? =20

regards,
Ladislav=2E

Re: communication with i2c client

[Frank]

--- Ladislav Klenoviè <lk99336@pobox.sk> wrote:

> Hi,
> I've create an i2c client and my questions is how to access it
> from userspace. This client is sitttng on adapter that  I was
> able to access via /dev interface. After the client were
> successfuly loaded and detected,
> ioctl(fd,I2C_SLAVE,...) and read/write functions didn't work
> and  error messages like "device busy" or "ioctl error" have
> occured. Also my debug messages from i2c client didn't arise
> when I am accessing 
> device only adapter's.
> How to (standardly) access a an i2c client? 
> Do I need to create an ioctl interface or exports some helper
> function for access it from user space and also from kernel
> space?  
> 
> regards,
> Ladislav.

You might get an answer here:
http://www.lm-sensors.org/

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communication with i2c client

[Ladislav Klenovič]

Hi,
I've create an i2c client and my questions is how to access it from use=
rspace=2E This client is sitttng on adapter that  I was able to access =
via /dev interface=2E After the client were successfuly loaded and dete=
cted,
ioctl(fd,I2C_SLAVE,=2E=2E=2E) and read/write functions didn't work and =
 error messages like "device busy" or "ioctl error" have occured=2E Als=
o my debug messages from i2c client didn't arise when I am accessing=20
device only adapter's=2E
How to (standardly) access a an i2c client?=20
Do I need to create an ioctl interface or exports some helper function =
for access it from user space and also from kernel space? =20

regards,
Ladislav=2E

Re: communication with i2c client

[Yong Wang]

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I think you should check the i2c drivers first.
Only the i2c drivers support the slave mode, the user space application can
access the i2c device.
The i2c drivers should modify the mode register of i2c controller to switch
the mode.

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