linux-kernel - [RFC v2 2/3] platform/chrome: typec: Get PD

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Date:   Thu, 30 Jan 2020 14:07:46 -0800
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     heikki.krogerus@...el.com, enric.balletbo@...labora.com,
        bleung@...omium.org, Prashant Malani <pmalani@...omium.org>,
        Guenter Roeck <groeck@...omium.org>
Subject: [RFC v2 2/3] platform/chrome: typec: Get PD_CONTROL version

Query the EC to determine the version number of the USB_PD_CONTROL
command which is supported by the EC. Also store this value in the Type
C data struct since it will be used to determine how to parse the
response to queries for port information from the EC.

Signed-off-by: Prashant Malani <pmalani@...omium.org>
---

Changes in v2:
- Fixed commit message title.

 drivers/platform/chrome/cros_ec_typec.c | 35 ++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index f48bb0172c565f..189c2192375c5d 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -22,6 +22,7 @@ struct cros_typec_data {
 	struct device *dev;
 	struct cros_ec_device *ec;
 	int num_ports;
+	unsigned int cmd_ver;
 	/* Array of ports, indexed by port number. */
 	struct typec_port *ports[EC_USB_PD_MAX_PORTS];
 };
@@ -137,6 +138,32 @@ static int cros_typec_get_num_ports(struct cros_typec_data *typec)
 	return 0;
 }
 
+static int cros_typec_get_cmd_version(struct cros_typec_data *typec)
+{
+	struct ec_params_get_cmd_versions_v1 req_v1;
+	struct ec_response_get_cmd_versions resp;
+	int ret;
+
+	/* We're interested in the PD control command version. */
+	req_v1.cmd = EC_CMD_USB_PD_CONTROL;
+	ret = cros_ec_send_cmd_msg(typec->ec, 1, EC_CMD_GET_CMD_VERSIONS,
+				   &req_v1, sizeof(req_v1), &resp,
+				   sizeof(resp));
+	if (ret < 0) {
+		return ret;
+	}
+
+	if (resp.version_mask & EC_VER_MASK(1))
+		typec->cmd_ver = 1;
+	else
+		typec->cmd_ver = 0;
+
+	dev_dbg(typec->dev, "PD Control has version mask 0x%hhx\n",
+		typec->cmd_ver);
+
+	return 0;
+}
+
 static int cros_typec_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
@@ -160,8 +187,14 @@ static int cros_typec_probe(struct platform_device *pdev)
 		return -EOVERFLOW;
 	}
 
+	ret = cros_typec_get_cmd_version(typec);
+	if (ret < 0) {
+		dev_err(dev, "failed to get PD command version info\n");
+		return ret;
+	}
+
 	ret = cros_typec_init_ports(typec);
-	if (!ret)
+	if (ret < 0)
 		return ret;
 
 	return 0;
-- 
2.25.0.341.g760bfbb309-goog