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List:       buildroot
Subject:    [Buildroot] i2c-at91 Driver
From:       pkavan () gmail ! com (Paul Kavan)
Date:       2007-04-24 21:10:02
Message-ID: 61c0054e0704241410ga495506sed2d4859a16cf6f8 () mail ! gmail ! com
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Hello all:

I am having some difficulties determining how to utilize the i2c-at91
driver. Has anyone had experience getting this driver to work correctly? If
so, do you mind giving me some pointers on how you did so? I have tried to
use

open("/dev/i2c", O_RDWR)

with the i2c dev driver....to no avail. I am looking at the source code for
i2c-at91.c and it does not appear to be similar to the gpio driver where it
exports symbols that I can use in another driver. As such, I am a little
unsure what to do from here.

One other point of concern. I have my kernel configured with

#
# I2C support
#
CONFIG_I2C=y
CONFIG_I2C_CHARDEV=y

#
# I2C Algorithms
#
# CONFIG_I2C_ALGOBIT is not set
# CONFIG_I2C_ALGOPCF is not set
# CONFIG_I2C_ALGOPCA is not set

#
# I2C Hardware Bus support
#
CONFIG_I2C_AT91=y
CONFIG_I2C_AT91_CLOCKRATE=100000
# CONFIG_I2C_OCORES is not set
# CONFIG_I2C_PARPORT_LIGHT is not set
# CONFIG_I2C_STUB is not set
# CONFIG_I2C_PCA_ISA is not set

#
# Miscellaneous I2C Chip support
#
# CONFIG_SENSORS_DS1337 is not set
# CONFIG_SENSORS_DS1374 is not set
# CONFIG_SENSORS_EEPROM is not set
# CONFIG_SENSORS_PCF8574 is not set
# CONFIG_SENSORS_PCA9539 is not set
# CONFIG_SENSORS_PCF8591 is not set
# CONFIG_SENSORS_MAX6875 is not set
# CONFIG_I2C_DEBUG_CORE is not set
# CONFIG_I2C_DEBUG_ALGO is not set
CONFIG_I2C_DEBUG_BUS=y
# CONFIG_I2C_DEBUG_CHIP is not set

Is there something I am missing in the configuration as well?

I would appreciate any pointers or tips on how to get the twi operating as
an i2c.

Thanks.

Paul
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