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    • O
      mfd: Add support for Diolan DLN-2 devices · 338a1281
      Octavian Purdila 提交于
      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: NOctavian Purdila <octavian.purdila@intel.com>
      Reviewed-by: NJohan Hovold <johan@kernel.org>
      Signed-off-by: NLee Jones <lee.jones@linaro.org>
      338a1281
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