linux-kernel - [PATCH 09/10] platform/chrome: cros_typec

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Date:   Wed, 28 Dec 2022 00:45:12 +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>,
        Stephen Boyd <swboyd@...omium.org>,
        Tinghan Shen <tinghan.shen@...iatek.com>,
        Tzung-Bi Shih <tzungbi@...nel.org>,
        Xiang wangx <wangxiang@...rlc.com>
Subject: [PATCH 09/10] platform/chrome: cros_typec_vdm: Add VDM reply support

Handle response VDMs which are sent by the partner (replying to VDMs
sent by the host system itself). These get forwarded to the altmode
driver.

Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Signed-off-by: Prashant Malani <pmalani@...omium.org>
---
 drivers/platform/chrome/cros_ec_typec.c  |  7 +++++
 drivers/platform/chrome/cros_typec_vdm.c | 39 ++++++++++++++++++++++++
 drivers/platform/chrome/cros_typec_vdm.h |  2 ++
 3 files changed, 48 insertions(+)

diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
index 1e28d56b094d..e02107a6870a 100644
--- a/drivers/platform/chrome/cros_ec_typec.c
+++ b/drivers/platform/chrome/cros_ec_typec.c
@@ -1000,6 +1000,13 @@ static void cros_typec_handle_status(struct cros_typec_data *typec, int port_num
 					 "Failed SOP Disc event clear, port: %d\n", port_num);
 		}
 	}
+
+	if (resp.events & PD_STATUS_EVENT_VDM_REQ_REPLY) {
+		cros_typec_handle_vdm_response(typec, port_num);
+		ret = cros_typec_send_clear_event(typec, port_num, PD_STATUS_EVENT_VDM_REQ_REPLY);
+		if (ret < 0)
+			dev_warn(typec->dev, "Failed VDM Reply event clear, port: %d\n", port_num);
+	}
 }
 
 static int cros_typec_port_update(struct cros_typec_data *typec, int port_num)
diff --git a/drivers/platform/chrome/cros_typec_vdm.c b/drivers/platform/chrome/cros_typec_vdm.c
index df0102ca3a18..fc7b602ceb37 100644
--- a/drivers/platform/chrome/cros_typec_vdm.c
+++ b/drivers/platform/chrome/cros_typec_vdm.c
@@ -13,6 +13,45 @@
 #include "cros_ec_typec.h"
 #include "cros_typec_vdm.h"
 
+/*
+ * Retrieves a VDM response from the EC and forwards it to the altmode driver based on SVID.
+ */
+void cros_typec_handle_vdm_response(struct cros_typec_data *typec, int port_num)
+{
+	struct ec_response_typec_vdm_response resp;
+	struct ec_params_typec_vdm_response req = {
+		.port = port_num,
+	};
+	struct typec_altmode *amode;
+	u16 svid;
+	u32 hdr;
+	int ret;
+
+	ret = cros_ec_cmd(typec->ec, 0, EC_CMD_TYPEC_VDM_RESPONSE, &req,
+			  sizeof(req), &resp, sizeof(resp));
+	if (ret < 0) {
+		dev_warn(typec->dev, "Failed VDM response fetch, port: %d\n", port_num);
+		return;
+	}
+
+	hdr = resp.vdm_response[0];
+	svid = PD_VDO_VID(hdr);
+	dev_dbg(typec->dev, "Received VDM header: %x, port: %d\n", hdr, port_num);
+
+	amode = typec_match_altmode(typec->ports[port_num]->port_altmode, CROS_EC_ALTMODE_MAX,
+				    svid, PD_VDO_OPOS(hdr));
+	if (!amode) {
+		dev_err(typec->dev, "Received VDM for unregistered altmode (SVID:%x), port: %d\n",
+			svid, port_num);
+		return;
+	}
+
+	ret = typec_altmode_vdm(amode, hdr, &resp.vdm_response[1], resp.vdm_data_objects);
+	if (ret)
+		dev_err(typec->dev, "Failed to forward VDM to altmode (SVID:%x), port: %d\n",
+			svid, port_num);
+}
+
 static int cros_typec_port_amode_enter(struct typec_altmode *amode, u32 *vdo)
 {
 	struct cros_typec_port *port = typec_altmode_get_drvdata(amode);
diff --git a/drivers/platform/chrome/cros_typec_vdm.h b/drivers/platform/chrome/cros_typec_vdm.h
index 7e282d168a98..003587525554 100644
--- a/drivers/platform/chrome/cros_typec_vdm.h
+++ b/drivers/platform/chrome/cros_typec_vdm.h
@@ -7,4 +7,6 @@
 
 extern struct typec_altmode_ops port_amode_ops;
 
+void cros_typec_handle_vdm_response(struct cros_typec_data *typec, int port_num);
+
 #endif /*  __CROS_TYPEC_VDM__ */
-- 
2.39.0.314.g84b9a713c41-goog