cros_ec: spi: Add support for EC protocol version 3

[karo-tx-uboot.git] / drivers / misc / cros_ec_spi.c

diff --git a/drivers/misc/cros_ec_spi.c b/drivers/misc/cros_ec_spi.c
index 2fc911025eeb5e01c76b9a9ace2eeabc6dbdc149..7df709cc714b92a4d06a85cdea747d28cdb3f643 100644 (file)
--- 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.