linux-kernel - [PATCH 3/4] platform/chrome: Use send_cmd

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Date:   Fri, 24 Jan 2020 17:21:07 -0800
From:   Prashant Malani <pmalani@...omium.org>
To:     enric.balletbo@...labora.com, bleung@...omium.org
Cc:     linux-kernel@...r.kernel.org,
        Prashant Malani <pmalani@...omium.org>
Subject: [PATCH 3/4] platform/chrome: Use send_cmd_msg in debugfs

Update Chrome EC's debugfs driver to use the cros_ec_send_cmd_msg()
wrapper instead of cros_ec_cmd_xfer_status() within the pdinfo_read()
function. This helps to remove some of the structure and buffer
definitions and some of the message buffer set up code.

Signed-off-by: Prashant Malani <pmalani@...omium.org>
---
 drivers/platform/chrome/cros_ec_debugfs.c | 39 +++++++----------------
 1 file changed, 12 insertions(+), 27 deletions(-)

diff --git a/drivers/platform/chrome/cros_ec_debugfs.c b/drivers/platform/chrome/cros_ec_debugfs.c
index 6ae484989d1f5..34c1c36be1c51 100644
--- a/drivers/platform/chrome/cros_ec_debugfs.c
+++ b/drivers/platform/chrome/cros_ec_debugfs.c
@@ -199,44 +199,29 @@ static ssize_t cros_ec_pdinfo_read(struct file *file,
 	char read_buf[EC_USB_PD_MAX_PORTS * 40], *p = read_buf;
 	struct cros_ec_debugfs *debug_info = file->private_data;
 	struct cros_ec_device *ec_dev = debug_info->ec->ec_dev;
-	struct {
-		struct cros_ec_command msg;
-		union {
-			struct ec_response_usb_pd_control_v1 resp;
-			struct ec_params_usb_pd_control params;
-		};
-	} __packed ec_buf;
-	struct cros_ec_command *msg;
-	struct ec_response_usb_pd_control_v1 *resp;
-	struct ec_params_usb_pd_control *params;
+	struct ec_response_usb_pd_control_v1 resp = {0};
+	struct ec_params_usb_pd_control params = {0};
 	int i;
 
-	msg = &ec_buf.msg;
-	params = (struct ec_params_usb_pd_control *)msg->data;
-	resp = (struct ec_response_usb_pd_control_v1 *)msg->data;
-
-	msg->command = EC_CMD_USB_PD_CONTROL;
-	msg->version = 1;
-	msg->insize = sizeof(*resp);
-	msg->outsize = sizeof(*params);
-
 	/*
 	 * Read status from all PD ports until failure, typically caused
 	 * by attempting to read status on a port that doesn't exist.
 	 */
 	for (i = 0; i < EC_USB_PD_MAX_PORTS; ++i) {
-		params->port = i;
-		params->role = 0;
-		params->mux = 0;
-		params->swap = 0;
-
-		if (cros_ec_cmd_xfer_status(ec_dev, msg) < 0)
+		params.port = i;
+		params.role = 0;
+		params.mux = 0;
+		params.swap = 0;
+
+		if (cros_ec_send_cmd_msg(ec_dev, 1, EC_CMD_USB_PD_CONTROL,
+					 &params, sizeof(params), &resp,
+					 sizeof(resp)) < 0)
 			break;
 
 		p += scnprintf(p, sizeof(read_buf) + read_buf - p,
 			       "p%d: %s en:%.2x role:%.2x pol:%.2x\n", i,
-			       resp->state, resp->enabled, resp->role,
-			       resp->polarity);
+			       resp.state, resp.enabled, resp.role,
+			       resp.polarity);
 	}
 
 	return simple_read_from_buffer(user_buf, count, ppos,
-- 
2.25.0.341.g760bfbb309-goog