diff options
Diffstat (limited to 'drivers/misc/cros_ec_spi.c')
| -rw-r--r-- | drivers/misc/cros_ec_spi.c | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/drivers/misc/cros_ec_spi.c b/drivers/misc/cros_ec_spi.c index 2fc911025e..7df709cc71 100644 --- a/drivers/misc/cros_ec_spi.c +++ b/drivers/misc/cros_ec_spi.c @@ -17,6 +17,30 @@ #include <cros_ec.h> #include <spi.h> +int cros_ec_spi_packet(struct cros_ec_dev *dev, int out_bytes, int in_bytes) +{ + int rv; + + /* Do the transfer */ + if (spi_claim_bus(dev->spi)) { + debug("%s: Cannot claim SPI bus\n", __func__); + return -1; + } + + rv = spi_xfer(dev->spi, max(out_bytes, in_bytes) * 8, + dev->dout, dev->din, + SPI_XFER_BEGIN | SPI_XFER_END); + + spi_release_bus(dev->spi); + + if (rv) { + debug("%s: Cannot complete SPI transfer\n", __func__); + return -1; + } + + return in_bytes; +} + /** * Send a command to a LPC CROS_EC device and return the reply. * @@ -42,6 +66,12 @@ int cros_ec_spi_command(struct cros_ec_dev *dev, uint8_t cmd, int cmd_version, int csum, len; int rv; + if (dev->protocol_version != 2) { + debug("%s: Unsupported EC protcol version %d\n", + __func__, dev->protocol_version); + return -1; + } + /* * Sanity-check input size to make sure it plus transaction overhead * fits in the internal device buffer. |