does I2c-stub create the /dev node?If it is not creating then you
have to do it yourself.
On Mon, Apr 22, 2013 at 5:11 PM, Sagar Padhye <sgr.m.pdy@xxxxxxxxx> wrote:
Hi,[USING : Ubuntu 12.04 LTS]I am trying to learn I2C subsystem. I havent found much of well documented things that can help a newbie on google. I just chose to read the linux kernel documentation txts.
I read the way kernel can interact with i2c through both SMBus calls & raw file op calls (ioctl, read, write). It looks good till that point.The doc also tells about i2c stub. which can be used as follows:--1. load the i2c module2. use i2cset (from the i2c-tools project) to pre-load some data3. load the target chip driver module4. observe its behavior in the kernel logI was able to achieve just the 1st step here. I loaded the module successfully.$ sudo modprobe i2c-stub chip_addr=0x023I got following Kern msg$dmesg...[658.071706] i2c-stub: Virtual chip at 0x23So I believe that step 1 is clear.in second step I have no idea how to provide needed inputs to command->Usage : i2cset [-f] [-y] [-m mask] I2CBUS CHIP-ADDRESS DATA-ADDRESS [VALUE] [MODE]I tried to give I2CBUS = 0, Chip addr = 0x23 & data addr=0 but it gives errorError : Could not open file '/dev/i2c-0' or '/dev/i2c/0' : No such file or directoryThere is no file at all created in /dev corrosponding to this device.Any idea how to use i2c properly? Is this an ubuntu only problem? Can anybody provide a good tutorial like thing to learn about i2c kernel & userspace driver programming?Thanks and Regards,Sagar
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