linux-kernel - [RFC PATCH 3/3] usb: typec: Add partner power registration call

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Date:   Thu,  2 Sep 2021 14:35:02 -0700
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        linux-pm@...r.kernel.org, bleung@...omium.org,
        heikki.krogerus@...ux.intel.com, badhri@...gle.com
Cc:     Prashant Malani <pmalani@...omium.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [RFC PATCH 3/3] usb: typec: Add partner power registration call

Add a function to register a power supply device for a partner. Also,
ensure that the registered power supply gets unregistered when the
partner is removed.

Signed-off-by: Prashant Malani <pmalani@...omium.org>
---
 drivers/usb/typec/class.c | 18 +++++++++++++++++-
 drivers/usb/typec/class.h |  2 ++
 include/linux/usb/typec.h |  5 +++++
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
index aeef453aa658..14a898440342 100644
--- a/drivers/usb/typec/class.c
+++ b/drivers/usb/typec/class.c
@@ -845,11 +845,27 @@ EXPORT_SYMBOL_GPL(typec_register_partner);
  */
 void typec_unregister_partner(struct typec_partner *partner)
 {
-	if (!IS_ERR_OR_NULL(partner))
+	if (!IS_ERR_OR_NULL(partner)) {
+		power_supply_unregister(partner->psy);
 		device_unregister(&partner->dev);
+	}
 }
 EXPORT_SYMBOL_GPL(typec_unregister_partner);
 
+int typec_partner_register_psy(struct typec_partner *partner, const struct power_supply_desc *desc,
+			       const struct power_supply_config *cfg)
+{
+	partner->psy = power_supply_register(&partner->dev, desc, cfg);
+	if (IS_ERR(partner->psy)) {
+		dev_err(&partner->dev, "failed to register partner power supply (%ld)\n",
+				PTR_ERR(partner->psy));
+		return PTR_ERR(partner->psy);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL_GPL(typec_partner_register_psy);
+
 /* ------------------------------------------------------------------------- */
 /* Type-C Cable Plugs */
 
diff --git a/drivers/usb/typec/class.h b/drivers/usb/typec/class.h
index aef03eb7e152..b75b0f22d982 100644
--- a/drivers/usb/typec/class.h
+++ b/drivers/usb/typec/class.h
@@ -4,6 +4,7 @@
 #define __USB_TYPEC_CLASS__
 
 #include <linux/device.h>
+#include <linux/power_supply.h>
 #include <linux/usb/typec.h>
 
 struct typec_mux;
@@ -33,6 +34,7 @@ struct typec_partner {
 	int				num_altmodes;
 	u16				pd_revision; /* 0300H = "3.0" */
 	enum usb_pd_svdm_ver		svdm_version;
+	struct power_supply		*psy;
 };
 
 struct typec_port {
diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
index e2e44bb1dad8..905527dab78c 100644
--- a/include/linux/usb/typec.h
+++ b/include/linux/usb/typec.h
@@ -22,6 +22,9 @@ struct typec_altmode_ops;
 struct fwnode_handle;
 struct device;
 
+struct power_supply_desc;
+struct power_supply_config;
+
 enum typec_port_type {
 	TYPEC_PORT_SRC,
 	TYPEC_PORT_SNK,
@@ -132,6 +135,8 @@ int typec_partner_set_num_altmodes(struct typec_partner *partner, int num_altmod
 struct typec_altmode
 *typec_partner_register_altmode(struct typec_partner *partner,
 				const struct typec_altmode_desc *desc);
+int typec_partner_register_psy(struct typec_partner *partner, const struct power_supply_desc *desc,
+			       const struct power_supply_config *cfg);
 int typec_plug_set_num_altmodes(struct typec_plug *plug, int num_altmodes);
 struct typec_altmode
 *typec_plug_register_altmode(struct typec_plug *plug,
-- 
2.33.0.153.gba50c8fa24-goog