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Diffstat (limited to 'include/spi.h')
-rw-r--r--include/spi.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/include/spi.h b/include/spi.h
index ad9248b..e2563c9 100644
--- a/include/spi.h
+++ b/include/spi.h
@@ -29,10 +29,13 @@
#define SPI_XFER_END 0x02 /* Deassert CS after transfer */
#define SPI_XFER_MMAP 0x08 /* Memory Mapped start */
#define SPI_XFER_MMAP_END 0x10 /* Memory Mapped End */
+#define SPI_XFER_ONCE (SPI_XFER_BEGIN | SPI_XFER_END)
/* Header byte that marks the start of the message */
#define SPI_PREAMBLE_END_BYTE 0xec
+#define SPI_DEFAULT_WORDLEN 8
+
/**
* struct spi_slave - Representation of a SPI slave
*
@@ -40,6 +43,7 @@
*
* @bus: ID of the bus that the slave is attached to.
* @cs: ID of the chip select connected to the slave.
+ * @wordlen: Size of SPI word in number of bits
* @max_write_size: If non-zero, the maximum number of bytes which can
* be written at once, excluding command bytes.
* @memory_map: Address of read-only SPI flash access.
@@ -47,6 +51,7 @@
struct spi_slave {
unsigned int bus;
unsigned int cs;
+ unsigned int wordlen;
unsigned int max_write_size;
void *memory_map;
};
@@ -153,6 +158,18 @@ int spi_claim_bus(struct spi_slave *slave);
void spi_release_bus(struct spi_slave *slave);
/**
+ * Set the word length for SPI transactions
+ *
+ * Set the word length (number of bits per word) for SPI transactions.
+ *
+ * @slave: The SPI slave
+ * @wordlen: The number of bits in a word
+ *
+ * Returns: 0 on success, -1 on failure.
+ */
+int spi_set_wordlen(struct spi_slave *slave, unsigned int wordlen);
+
+/**
* SPI transfer
*
* This writes "bitlen" bits out the SPI MOSI port and simultaneously clocks