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greybus: spi: add rdwr field to transfer descriptor 

Add read and/or write field to transfer descriptor to make it possible
to identify the type of transfer.

Signed-off-by: Rui Miguel Silva <rui.silva@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
This commit is contained in:
Rui Miguel Silva 2015-12-02 11:12:27 +00:00 committed by Greg Kroah-Hartman
parent 3e48acac26
commit b455c84655
2 changed files with 7 additions and 1 deletions
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3
drivers/staging/greybus/greybus_protocols.h
View File

@ -695,6 +695,9 @@ struct gb_spi_transfer {
__le16 delay_usecs;
__u8 cs_change;
__u8 bits_per_word;
__u8 rdwr;
#define GB_SPI_XFER_READ 0x01
#define GB_SPI_XFER_WRITE 0x02
} __packed;
struct gb_spi_transfer_request {

5
drivers/staging/greybus/spi.c
View File

@ -107,13 +107,16 @@ gb_spi_operation_create(struct gb_connection *connection,
gb_xfer->delay_usecs = cpu_to_le16(xfer->delay_usecs);
gb_xfer->cs_change = xfer->cs_change;
gb_xfer->bits_per_word = xfer->bits_per_word;
gb_xfer++;
/* Copy tx data */
if (xfer->tx_buf) {
memcpy(tx_data, xfer->tx_buf, xfer->len);
tx_data += xfer->len;
gb_xfer->rdwr |= GB_SPI_XFER_WRITE;
}
if (xfer->rx_buf)
gb_xfer->rdwr |= GB_SPI_XFER_READ;
gb_xfer++;
}
return operation;