From: Octavian Purdila Date: Thu, 6 Nov 2014 13:48:03 +0000 (+0200) Subject: mfd: Add support for Diolan DLN-2 devices X-Git-Tag: omap-for-v3.19/fixes-for-merge-window~27^2~37^2~6 X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=338a128142975439a19ab3c91480bc9d5a71f033;p=pandora-kernel.git mfd: Add support for Diolan DLN-2 devices This patch implements the USB part of the Diolan USB-I2C/SPI/GPIO Master Adapter DLN-2. Details about the device can be found here: https://www.diolan.com/i2c/i2c_interface.html. Information about the USB protocol can be found in the Programmer's Reference Manual [1], see section 1.7. Because the hardware has a single transmit endpoint and a single receive endpoint the communication between the various DLN2 drivers and the hardware will be muxed/demuxed by this driver. Each DLN2 module will be identified by the handle field within the DLN2 message header. If a DLN2 module issues multiple commands in parallel they will be identified by the echo counter field in the message header. The DLN2 modules can use the dln2_transfer() function to issue a command and wait for its response. They can also register a callback that is going to be called when a specific event id is generated by the device (e.g. GPIO interrupts). The device uses handle 0 for sending events. [1] https://www.diolan.com/downloads/dln-api-manual.pdf Signed-off-by: Octavian Purdila Reviewed-by: Johan Hovold Signed-off-by: Lee Jones --- Reading git-diff-tree failed