Finally, here is my take on the often desired feature that Linux can not only be an I2C master, but also an I2C slave. Compared to my draft sent out last week, this RFC has been tested on hardware (Renesas Lager board) and works \o/
One big part still missing is documentation, so brave ones need to "use the source". However, this approach turned out to be even less intrusive than expected, so that is hopefully a good sign. Basically, an I2C slave is a standard I2C client providing a callback function. When registering as a slave, the connection to the I2C adapter is made which uses the callback when a slave event happens. That splits the HW support (enabling slave mode on the adapter) and SW support (here a generic eeprom simulator) nicely IMO. Besides documentation, there are still some error checks missing and more features could also be added (of course). Yet, I think this version is good enough to discuss the steps taken here. The patches are based on top of 3.17-rc4, but will easily apply to renesas/devel. A git tree can be found here: git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux.git i2c/slave-support Comments welcome! Thanks, Wolfram Wolfram Sang (4): i2c: core changes for slave support i2c: slave: add eeprom simulator driver i2c: rcar: add slave support ARM: shmobile: r8a7790: adapt DTS for I2C slave support arch/arm/boot/dts/r8a7790-lager.dts | 15 ++-- drivers/i2c/Kconfig | 10 +++ drivers/i2c/Makefile | 1 + drivers/i2c/busses/i2c-rcar.c | 122 ++++++++++++++++++++++++++--- drivers/i2c/i2c-core.c | 44 +++++++++++ drivers/i2c/i2c-slave-eeprom.c | 152 ++++++++++++++++++++++++++++++++++++ include/linux/i2c.h | 22 ++++++ 7 files changed, 352 insertions(+), 14 deletions(-) create mode 100644 drivers/i2c/i2c-slave-eeprom.c -- 2.0.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
