linux-kernel - [PATCH v2 3/3] usb: typec: ucsi: Get PD revision for partner

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Date: Wed, 24 Jan 2024 16:44:54 -0800
From: Abhishek Pandit-Subedi <abhishekpandit@...gle.com>
To: Heikki Krogerus <heikki.krogerus@...ux.intel.com>, linux-usb@...r.kernel.org
Cc: jthies@...gle.com, pmalani@...omium.org, 
	Abhishek Pandit-Subedi <abhishekpandit@...omium.org>, Bjorn Andersson <andersson@...nel.org>, 
	Dmitry Baryshkov <dmitry.baryshkov@...aro.org>, Fabrice Gasnier <fabrice.gasnier@...s.st.com>, 
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Hans de Goede <hdegoede@...hat.com>, 
	Neil Armstrong <neil.armstrong@...aro.org>, Saranya Gopal <saranya.gopal@...el.com>, 
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/3] usb: typec: ucsi: Get PD revision for partner

From: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>

PD major revision for the port partner is described in
GET_CONNECTOR_CAPABILITY and is only valid on UCSI 2.0 and newer. Update
the pd_revision on the partner if the UCSI version is 2.0 or newer.

Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
---
$ cat /sys/class/typec/port2-partner/usb_power_delivery_revision
3.0

Changes in v2:
  - Formatting changes and update macro to use brackets.
  - Fix incorrect guard condition when checking connector capability.

 drivers/usb/typec/ucsi/ucsi.c | 23 +++++++++++++++++++++++
 drivers/usb/typec/ucsi/ucsi.h |  3 +++
 2 files changed, 26 insertions(+)

diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index a35056ee3e96..2b7983d2fdae 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -782,6 +782,7 @@ static int ucsi_register_partner(struct ucsi_connector *con)
 	}
 
 	desc.usb_pd = pwr_opmode == UCSI_CONSTAT_PWR_OPMODE_PD;
+	desc.pd_revision = UCSI_CONCAP_FLAG_PARTNER_PD_MAJOR_REV_AS_BCD(con->cap.flags);
 
 	partner = typec_register_partner(con->port, &desc);
 	if (IS_ERR(partner)) {
@@ -856,6 +857,27 @@ static void ucsi_partner_change(struct ucsi_connector *con)
 			con->num, u_role);
 }
 
+static int ucsi_check_connector_capability(struct ucsi_connector *con)
+{
+	u64 command;
+	int ret;
+
+	if (!con->partner || !IS_MIN_VERSION_2_0(con->ucsi))
+		return 0;
+
+	command = UCSI_GET_CONNECTOR_CAPABILITY | UCSI_CONNECTOR_NUMBER(con->num);
+	ret = ucsi_send_command(con->ucsi, command, &con->cap, sizeof(con->cap));
+	if (ret < 0) {
+		dev_err(con->ucsi->dev, "GET_CONNECTOR_CAPABILITY failed (%d)\n", ret);
+		return ret;
+	}
+
+	typec_partner_set_pd_revision(con->partner,
+		UCSI_CONCAP_FLAG_PARTNER_PD_MAJOR_REV_AS_BCD(con->cap.flags));
+
+	return ret;
+}
+
 static int ucsi_check_connection(struct ucsi_connector *con)
 {
 	u8 prev_flags = con->status.flags;
@@ -925,6 +947,7 @@ static void ucsi_handle_connector_change(struct work_struct *work)
 		if (con->status.flags & UCSI_CONSTAT_CONNECTED) {
 			ucsi_register_partner(con);
 			ucsi_partner_task(con, ucsi_check_connection, 1, HZ);
+			ucsi_partner_task(con, ucsi_check_connector_capability, 1, HZ);
 
 			if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) ==
 			    UCSI_CONSTAT_PWR_OPMODE_PD)
diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h
index 94b373378f63..a0c452d09cf6 100644
--- a/drivers/usb/typec/ucsi/ucsi.h
+++ b/drivers/usb/typec/ucsi/ucsi.h
@@ -36,6 +36,9 @@ struct dentry;
 #define UCSI_BCD_GET_MINOR(_v_)		(((_v_) >> 4) & 0x0F)
 #define UCSI_BCD_GET_SUBMINOR(_v_)	((_v_) & 0x0F)
 
+#define IS_MIN_VERSION(ucsi, min_ver)	((ucsi)->version >= (min_ver))
+#define IS_MIN_VERSION_2_0(ucsi)	IS_MIN_VERSION(ucsi, UCSI_VERSION_2_0)
+
 /* Command Status and Connector Change Indication (CCI) bits */
 #define UCSI_CCI_CONNECTOR(_c_)		(((_c_) & GENMASK(7, 1)) >> 1)
 #define UCSI_CCI_LENGTH(_c_)		(((_c_) & GENMASK(15, 8)) >> 8)
-- 
2.43.0.429.g432eaa2c6b-goog