[PATCH v6 07/16] usb: core: Move struct usb_port and related APIs to port.h

|struct usb_port| and its matching container_of() macro should live in
its own port.h, matching the split we have for .c files.

Move them as described. Also move usb_port_is_power_on(), since in the
next change its |struct usb_hub *| parameter will be changed to
|struct usb_port *|, and becomes a non-static function that only
references |struct usb_port|.

port.h is only included from hub.h, as a subsequent patch will directly
use fields from |struct usb_port| in a static inline helper in hub.h.
The USB internal headers don't have header guards to help with this.

Also drop 'extern' from the header declaration of usb_port_is_power_on().
This is not needed in modern C.

Suggested-by: Andy Shevchenko <[email protected]>
Reviewed-by: Bartosz Golaszewski <[email protected]>
Reviewed-by: Andy Shevchenko <[email protected]>
Signed-off-by: Chen-Yu Tsai <[email protected]>
---
Changes since v4:
- Dropped 'extern' (Andy)

Changes since v3:
- New patch (Andy)
---
 drivers/usb/core/hub.c  | 16 ----------
 drivers/usb/core/hub.h  | 48 ++---------------------------
 drivers/usb/core/port.c | 16 ++++++++++
 drivers/usb/core/port.h | 68 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 86 insertions(+), 62 deletions(-)
 create mode 100644 drivers/usb/core/port.h

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 8f8624a0d36a..a6c4e4c0368a 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -3240,22 +3240,6 @@ static bool hub_port_stop_enumerate(struct usb_hub *hub, int port1, int retries)
 	return port_dev->ignore_event;
 }
 
-/* Check if a port is power on */
-int usb_port_is_power_on(struct usb_hub *hub, unsigned int portstatus)
-{
-	int ret = 0;
-
-	if (hub_is_superspeed(hub->hdev)) {
-		if (portstatus & USB_SS_PORT_STAT_POWER)
-			ret = 1;
-	} else {
-		if (portstatus & USB_PORT_STAT_POWER)
-			ret = 1;
-	}
-
-	return ret;
-}
-
 static void usb_lock_port(struct usb_port *port_dev)
 		__acquires(&port_dev->status_lock)
 {
diff --git a/drivers/usb/core/hub.h b/drivers/usb/core/hub.h
index 9ebc5ef54a32..de524c6da9fc 100644
--- a/drivers/usb/core/hub.h
+++ b/drivers/usb/core/hub.h
@@ -15,7 +15,9 @@
 #include <linux/usb/ch11.h>
 #include <linux/usb/hcd.h>
 #include <linux/usb/typec.h>
+
 #include "usb.h"
+#include "port.h"
 
 struct usb_hub {
 	struct device		*intfdev;	/* the "interface" device */
@@ -78,51 +80,6 @@ struct usb_hub {
 	struct list_head        onboard_devs;
 };
 
-/**
- * struct usb port - kernel's representation of a usb port
- * @child: usb device attached to the port
- * @dev: generic device interface
- * @port_owner: port's owner
- * @peer: related usb2 and usb3 ports (share the same connector)
- * @connector: USB Type-C connector
- * @req: default pm qos request for hubs without port power control
- * @connect_type: port's connect type
- * @state: device state of the usb device attached to the port
- * @state_kn: kernfs_node of the sysfs attribute that accesses @state
- * @location: opaque representation of platform connector location
- * @status_lock: synchronize port_event() vs usb_port_{suspend|resume}
- * @portnum: port index num based one
- * @is_superspeed cache super-speed status
- * @usb3_lpm_u1_permit: whether USB3 U1 LPM is permitted.
- * @usb3_lpm_u2_permit: whether USB3 U2 LPM is permitted.
- * @early_stop: whether port initialization will be stopped earlier.
- * @ignore_event: whether events of the port are ignored.
- */
-struct usb_port {
-	struct usb_device *child;
-	struct device dev;
-	struct usb_dev_state *port_owner;
-	struct usb_port *peer;
-	struct typec_connector *connector;
-	struct dev_pm_qos_request *req;
-	enum usb_port_connect_type connect_type;
-	enum usb_device_state state;
-	struct kernfs_node *state_kn;
-	usb_port_location_t location;
-	struct mutex status_lock;
-	u32 over_current_count;
-	u8 portnum;
-	u32 quirks;
-	unsigned int early_stop:1;
-	unsigned int ignore_event:1;
-	unsigned int is_superspeed:1;
-	unsigned int usb3_lpm_u1_permit:1;
-	unsigned int usb3_lpm_u2_permit:1;
-};
-
-#define to_usb_port(_dev) \
-	container_of(_dev, struct usb_port, dev)
-
 extern int usb_hub_create_port_device(struct usb_hub *hub,
 		int port1);
 extern void usb_hub_remove_port_device(struct usb_hub *hub,
@@ -138,7 +95,6 @@ extern int usb_clear_port_feature(struct usb_device *hdev,
 		int port1, int feature);
 extern int usb_hub_port_status(struct usb_hub *hub, int port1,
 		u16 *status, u16 *change);
-extern int usb_port_is_power_on(struct usb_hub *hub, unsigned int portstatus);
 
 static inline bool hub_is_port_power_switchable(struct usb_hub *hub)
 {
diff --git a/drivers/usb/core/port.c b/drivers/usb/core/port.c
index c0a51d9b06a6..b2e953f137f8 100644
--- a/drivers/usb/core/port.c
+++ b/drivers/usb/core/port.c
@@ -22,6 +22,22 @@ static int usb_port_block_power_off;
 
 static const struct attribute_group *port_dev_group[];
 
+/* Check if a port is power on */
+int usb_port_is_power_on(struct usb_hub *hub, unsigned int portstatus)
+{
+	int ret = 0;
+
+	if (hub_is_superspeed(hub->hdev)) {
+		if (portstatus & USB_SS_PORT_STAT_POWER)
+			ret = 1;
+	} else {
+		if (portstatus & USB_PORT_STAT_POWER)
+			ret = 1;
+	}
+
+	return ret;
+}
+
 static bool usb_port_allow_power_off(struct usb_device *hdev,
 				     struct usb_hub *hub,
 				     struct usb_port *port_dev)
diff --git a/drivers/usb/core/port.h b/drivers/usb/core/port.h
new file mode 100644
index 000000000000..00f7500af336
--- /dev/null
+++ b/drivers/usb/core/port.h
@@ -0,0 +1,68 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * usb hub driver head file
+ *
+ * Copyright (C) 1999 Linus Torvalds
+ * Copyright (C) 1999 Johannes Erdfelt
+ * Copyright (C) 1999 Gregory P. Smith
+ * Copyright (C) 2001 Brad Hards ([email protected])
+ * Copyright (C) 2012 Intel Corp ([email protected])
+ *
+ *  move struct usb_port to this file.
+ */
+
+#include <linux/container_of.h>
+#include <linux/device.h>
+#include <linux/mutex_types.h>
+#include <linux/usb.h>
+
+#include <uapi/linux/usb/ch9.h>
+
+/**
+ * struct usb port - kernel's representation of a usb port
+ * @child: usb device attached to the port
+ * @dev: generic device interface
+ * @port_owner: port's owner
+ * @peer: related usb2 and usb3 ports (share the same connector)
+ * @connector: USB Type-C connector
+ * @req: default pm qos request for hubs without port power control
+ * @connect_type: port's connect type
+ * @state: device state of the usb device attached to the port
+ * @state_kn: kernfs_node of the sysfs attribute that accesses @state
+ * @location: opaque representation of platform connector location
+ * @status_lock: synchronize port_event() vs usb_port_{suspend|resume}
+ * @portnum: port index num based one
+ * @is_superspeed cache super-speed status
+ * @usb3_lpm_u1_permit: whether USB3 U1 LPM is permitted.
+ * @usb3_lpm_u2_permit: whether USB3 U2 LPM is permitted.
+ * @early_stop: whether port initialization will be stopped earlier.
+ * @ignore_event: whether events of the port are ignored.
+ */
+struct usb_port {
+	struct usb_device *child;
+	struct device dev;
+	struct usb_dev_state *port_owner;
+	struct usb_port *peer;
+	struct typec_connector *connector;
+	struct dev_pm_qos_request *req;
+	enum usb_port_connect_type connect_type;
+	enum usb_device_state state;
+	struct kernfs_node *state_kn;
+	usb_port_location_t location;
+	struct mutex status_lock;
+	u32 over_current_count;
+	u8 portnum;
+	u32 quirks;
+	unsigned int early_stop:1;
+	unsigned int ignore_event:1;
+	unsigned int is_superspeed:1;
+	unsigned int usb3_lpm_u1_permit:1;
+	unsigned int usb3_lpm_u2_permit:1;
+};
+
+#define to_usb_port(_dev) \
+	container_of(_dev, struct usb_port, dev)
+
+struct usb_hub;
+
+int usb_port_is_power_on(struct usb_hub *hub, unsigned int portstatus);
-- 
2.55.0.229.g6434b31f56-goog