linux-kernel - [PATCH 10/10] platform/chrome: cros_typec

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Date:   Wed, 28 Dec 2022 00:45:13 +0000
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org, chrome-platform@...ts.linux.dev
Cc:     heikki.krogerus@...ux.intel.com,
        Prashant Malani <pmalani@...omium.org>,
        Benson Leung <bleung@...omium.org>,
        Daisuke Nojiri <dnojiri@...omium.org>,
        "Dustin L. Howett" <dustin@...ett.net>,
        Evan Green <evgreen@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Guenter Roeck <groeck@...omium.org>,
        "Gustavo A. R. Silva" <gustavoars@...nel.org>,
        Kees Cook <keescook@...omium.org>,
        Lee Jones <lee.jones@...aro.org>, Lee Jones <lee@...nel.org>,
        Sebastian Reichel <sebastian.reichel@...labora.com>,
        Stephen Boyd <swboyd@...omium.org>,
        Tinghan Shen <tinghan.shen@...iatek.com>,
        Tzung-Bi Shih <tzungbi@...nel.org>,
        Xiang wangx <wangxiang@...rlc.com>
Subject: [PATCH 10/10] platform/chrome: cros_typec_vdm: Add VDM send support

Add support to send generic VDM messages from the alt mode driver to the
partner (via the ChromeOS EC). The function introduced here is intended
to be called by the alt mode driver (via the Type-C bus logic).

Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Signed-off-by: Prashant Malani <pmalani@...omium.org>
---
 drivers/platform/chrome/cros_typec_vdm.c | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/drivers/platform/chrome/cros_typec_vdm.c b/drivers/platform/chrome/cros_typec_vdm.c
index fc7b602ceb37..aca9d337118e 100644
--- a/drivers/platform/chrome/cros_typec_vdm.c
+++ b/drivers/platform/chrome/cros_typec_vdm.c
@@ -77,6 +77,30 @@ static int cros_typec_port_amode_enter(struct typec_altmode *amode, u32 *vdo)
 			   sizeof(req), NULL, 0);
 }
 
+static int cros_typec_port_amode_vdm(struct typec_altmode *amode, const u32 hdr,
+				     const u32 *vdo, int cnt)
+{
+	struct cros_typec_port *port = typec_altmode_get_drvdata(amode);
+	struct ec_params_typec_control req = {
+		.port = port->port_num,
+		.command = TYPEC_CONTROL_COMMAND_SEND_VDM_REQ,
+	};
+	struct typec_vdm_req vdm_req = {};
+
+	vdm_req.vdm_data[0] = hdr;
+	vdm_req.vdm_data_objects = cnt;
+	memcpy(&vdm_req.vdm_data[1], vdo, cnt - 1);
+	vdm_req.partner_type = TYPEC_PARTNER_SOP;
+	req.vdm_req_params = vdm_req;
+
+	dev_dbg(port->typec_data->dev, "Sending VDM, hdr: %x, num_objects: %d, port: %d\n",
+		hdr, cnt, port->port_num);
+
+	return cros_ec_cmd(port->typec_data->ec, 0, EC_CMD_TYPEC_CONTROL, &req,
+			   sizeof(req), NULL, 0);
+}
+
 struct typec_altmode_ops port_amode_ops = {
 	.enter = cros_typec_port_amode_enter,
+	.vdm = cros_typec_port_amode_vdm,
 };
-- 
2.39.0.314.g84b9a713c41-goog