spi_sync man page on Scientific

spi_sync man page on Scientific

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SPI_SYNC(9)		Serial Peripheral Interface (S		   SPI_SYNC(9)

NAME
       spi_sync - blocking/synchronous SPI data transfers

SYNOPSIS
       int spi_sync(struct spi_device * spi, struct spi_message * message);

ARGUMENTS
       spi
	   device with which data will be exchanged

       message
	   describes the data transfers

CONTEXT
       can sleep

DESCRIPTION
       This call may only be used from a context that may sleep. The sleep is
       non-interruptible, and has no timeout. Low-overhead controller drivers
       may DMA directly into and out of the message buffers.

       Note that the SPI device´s chip select is active during the message,
       and then is normally disabled between messages. Drivers for some
       frequently-used devices may want to minimize costs of selecting a chip,
       by leaving it selected in anticipation that the next message will go to
       the same chip. (That may increase power usage.)

       Also, the caller is guaranteeing that the memory associated with the
       message will not be freed before this call returns.

       It returns zero on success, else a negative error code.

COPYRIGHT
Kernel Hackers Manual 2.6.	 November 2013			   SPI_SYNC(9)

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