linux-kernel - [PATCH v4 3/4] platform/chrome: typec: Get PD

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Message-Id: <20200312225719.14753-4-pmalani@chromium.org>
Date:   Thu, 12 Mar 2020 15:57:17 -0700
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org
Cc:     Prashant Malani <pmalani@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Enric Balletbo i Serra <enric.balletbo@...labora.com>,
        Guenter Roeck <groeck@...omium.org>
Subject: [PATCH v4 3/4] platform/chrome: typec: Get PD_CONTROL cmd version

Query the EC to determine the version number of the 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 v4:
- No changes

Changes in v3:
- Moved if statement check in the end of probe() from this patch to a
  previous patch.

Changes in v2:
- No changes.

 drivers/platform/chrome/cros_ec_typec.c | 32 +++++++++++++++++++++++++
 1 file changed, 32 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 02e6d5cbbbf7a..9f692eb78b322 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -21,6 +21,7 @@ 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];
 	/* Initial capabilities for each port. */
@@ -171,6 +172,31 @@ static int cros_typec_ec_command(struct cros_typec_data *typec,
 	return ret;
 }
 
+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_typec_ec_command(typec, 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;
+}
+
 #ifdef CONFIG_ACPI
 static const struct acpi_device_id cros_typec_acpi_id[] = {
 	{ "GOOG0014", 0 },
@@ -202,6 +228,12 @@ static int cros_typec_probe(struct platform_device *pdev)
 	typec->ec = dev_get_drvdata(pdev->dev.parent);
 	platform_set_drvdata(pdev, typec);
 
+	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_ec_command(typec, 0, EC_CMD_USB_PD_PORTS, NULL, 0,
 				    &resp, sizeof(resp));
 	if (ret < 0)
-- 
2.25.1.481.gfbce0eb801-goog