How to forward IOCTL's from i2c-dev.c to adapter driver (i2c-rt3352.c)

elonica.pl · 08-18-2011, 04:19 AM

I'm writing the I2C adapter driver for SOC. This adapter exist now in system and RTC driver works with it via .master_xfer.

I would like to send IOCTL's from application via /dev/i2c. I have loaded i2c_dev and all modules. After sending IOCTL I get following :

#i2ccmd read 0
i2cdev_open[382]
i2c_dev_get_by_minor[54]
i2c_get_adapter[896]
i2cdev_ioctl[186]
ioctl, cmd=0x03, arg=0x00
i2c_control[731]
i2cdev_release[420]
i2c_put_adapter[910]

i2cdev_ioctl method doesn't send I2C_RDWR IOCT'L to my adapter driver. How can I forward those IOCTL's to i2c-rt3352.c ?

nini09 · 08-19-2011, 02:58 PM

Check following link
http://www.mjmwired.net/kernel/Docum.../dev-interface

elonica.pl · 08-23-2011, 02:03 AM

I've found the way to pass my own IOCTL's: .algo_control function pointer in i2c_algorithm struct will handle special ioctl's.

i2cdev_ioctl -> (default) -> i2c_control -> (default) -> (adap->algo->algo_control)