linux-kernel - [PATCH v22 3/3] usb: core: hub: Create platform devices for onboard hubs in hub

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Date:   Thu,  9 Jun 2022 12:20:00 -0700
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Alan Stern <stern@...land.harvard.edu>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Mathias Nyman <mathias.nyman@...el.com>,
        Felipe Balbi <balbi@...nel.org>
Cc:     Michal Simek <michal.simek@...inx.com>,
        linux-kernel@...r.kernel.org,
        Krzysztof Kozlowski <krzk@...nel.org>,
        Stephen Boyd <swboyd@...omium.org>, devicetree@...r.kernel.org,
        Bastien Nocera <hadess@...ess.net>,
        Peter Chen <peter.chen@...nel.org>,
        Ravi Chandra Sadineni <ravisadineni@...omium.org>,
        Roger Quadros <rogerq@...nel.org>,
        Douglas Anderson <dianders@...omium.org>,
        linux-usb@...r.kernel.org, Matthias Kaehlcke <mka@...omium.org>,
        Andrew Lunn <andrew@...n.ch>,
        Bhuvanesh Surachari <Bhuvanesh_Surachari@...tor.com>,
        Kai-Heng Feng <kai.heng.feng@...onical.com>,
        Mathias Nyman <mathias.nyman@...ux.intel.com>,
        Vincent Mailhol <mailhol.vincent@...adoo.fr>
Subject: [PATCH v22 3/3] usb: core: hub: Create platform devices for onboard hubs in hub_probe()

Call onboard_hub_create/destroy_pdevs() from hub_probe/disconnect()
to create/destroy platform devices for onboard USB hubs that may be
connected to the hub. The onboard hubs must have nodes in the
device tree.

onboard_hub_create/destroy_pdevs() are NOPs unless
CONFIG_USB_ONBOARD_HUB=y/m.

Also add a field to struct usb_hub to keep track of the onboard hub
platform devices that are owned by the hub.

Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
---

Changes in v22:
- patch added to the series (moved creation/deletion from HCD)

 drivers/usb/core/hub.c | 9 ++++++++-
 drivers/usb/core/hub.h | 1 +
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/core/hub.c b/drivers/usb/core/hub.c
index 68e9121c1878..8055130ee602 100644
--- a/drivers/usb/core/hub.c
+++ b/drivers/usb/core/hub.c
@@ -23,6 +23,7 @@
 #include <linux/usb.h>
 #include <linux/usbdevice_fs.h>
 #include <linux/usb/hcd.h>
+#include <linux/usb/onboard_hub.h>
 #include <linux/usb/otg.h>
 #include <linux/usb/quirks.h>
 #include <linux/workqueue.h>
@@ -1752,6 +1753,8 @@ static void hub_disconnect(struct usb_interface *intf)
 	if (hub->quirk_disable_autosuspend)
 		usb_autopm_put_interface(intf);
 
+	onboard_hub_destroy_pdevs(&hub->onboard_hub_devs);
+
 	kref_put(&hub->kref, hub_release);
 }
 
@@ -1869,6 +1872,7 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
 	INIT_DELAYED_WORK(&hub->leds, led_work);
 	INIT_DELAYED_WORK(&hub->init_work, NULL);
 	INIT_WORK(&hub->events, hub_event);
+	INIT_LIST_HEAD(&hub->onboard_hub_devs);
 	spin_lock_init(&hub->irq_urb_lock);
 	timer_setup(&hub->irq_urb_retry, hub_retry_irq_urb, 0);
 	usb_get_intf(intf);
@@ -1889,8 +1893,11 @@ static int hub_probe(struct usb_interface *intf, const struct usb_device_id *id)
 		usb_autopm_get_interface_no_resume(intf);
 	}
 
-	if (hub_configure(hub, &desc->endpoint[0].desc) >= 0)
+	if (hub_configure(hub, &desc->endpoint[0].desc) >= 0) {
+		onboard_hub_create_pdevs(hdev, &hub->onboard_hub_devs);
+
 		return 0;
+	}
 
 	hub_disconnect(intf);
 	return -ENODEV;
diff --git a/drivers/usb/core/hub.h b/drivers/usb/core/hub.h
index 22ea1f4f2d66..ccf90052d12a 100644
--- a/drivers/usb/core/hub.h
+++ b/drivers/usb/core/hub.h
@@ -73,6 +73,7 @@ struct usb_hub {
 	spinlock_t		irq_urb_lock;
 	struct timer_list	irq_urb_retry;
 	struct usb_port		**ports;
+	struct list_head        onboard_hub_devs;
 };
 
 /**
-- 
2.36.1.476.g0c4daa206d-goog