From: Randall Spangler <rspang...@chromium.org>
Protocol version 3 will be attempted first; if the EC doesn't support
it, u-boot will fall back to the old protocol version (2).
Reviewed-by: Simon Glass <s...@chromium.org>
Signed-off-by: Randall Spangler <rspang...@chromium.org>
Signed-off-by: Simon Glass <s...@chromium.org>
---
Changes in v2: None
drivers/misc/cros_ec.c | 12 ++++++++++++
drivers/misc/cros_ec_spi.c | 24 ++++++++++++++++++++++++
include/cros_ec.h | 13 +++++++++++++
3 files changed, 49 insertions(+)
diff --git a/drivers/misc/cros_ec.c b/drivers/misc/cros_ec.c
index a7716b8..5682d39 100644
--- a/drivers/misc/cros_ec.c
+++ b/drivers/misc/cros_ec.c
@@ -218,6 +218,11 @@ static int send_command_proto3(struct cros_ec_dev *dev,
return in_bytes;
switch (dev->interface) {
+#ifdef CONFIG_CROS_EC_SPI
+ case CROS_EC_IF_SPI:
+ rv = cros_ec_spi_packet(dev, out_bytes, in_bytes);
+ break;
+#endif
case CROS_EC_IF_NONE:
/* TODO: support protocol 3 for LPC, I2C; for now fall through */
default:
@@ -665,6 +670,13 @@ static int cros_ec_check_version(struct cros_ec_dev *dev)
* So for now, just read all the data anyway.
*/
+ /* Try sending a version 3 packet */
+ dev->protocol_version = 3;
+ if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
+ (uint8_t **)&resp, sizeof(*resp)) > 0) {
+ return 0;
+ }
+
/* Try sending a version 2 packet */
dev->protocol_version = 2;
if (ec_command_inptr(dev, EC_CMD_HELLO, 0, &req, sizeof(req),
diff --git a/drivers/misc/cros_ec_spi.c b/drivers/misc/cros_ec_spi.c
index ef73782..7df709c 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.
*
diff --git a/include/cros_ec.h b/include/cros_ec.h
index 1199d92..84f9104 100644
--- a/include/cros_ec.h
+++ b/include/cros_ec.h
@@ -312,6 +312,19 @@ int cros_ec_spi_command(struct cros_ec_dev *dev, uint8_t
cmd, int cmd_version,
uint8_t **dinp, int din_len);
/**
+ * Send a packet to a CROS-EC device and return the response packet.
+ *
+ * Expects the request packet to be stored in dev->dout. Stores the response
+ * packet in dev->din.
+ *
+ * @param dev CROS-EC device
+ * @param out_bytes Size of request packet to output
+ * @param in_bytes Maximum size of response packet to receive
+ * @return number of bytes in response packet, or <0 on error
+ */
+int cros_ec_spi_packet(struct cros_ec_dev *dev, int out_bytes, int in_bytes);
+
+/**
* Dump a block of data for a command.
*
* @param name Name for data (e.g. 'in', 'out')
--
1.9.0.279.gdc9e3eb
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