• Octavian Purdila's avatar
    mfd: Add support for Diolan DLN-2 devices · 338a1281
    Octavian Purdila authored
    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.pdfSigned-off-by: default avatarOctavian Purdila <octavian.purdila@intel.com>
    Reviewed-by: default avatarJohan Hovold <johan@kernel.org>
    Signed-off-by: default avatarLee Jones <lee.jones@linaro.org>
    338a1281
Makefile 6.72 KB