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Message-Id: <d610b629a5f32fb76c24012180743f7f0f1872c0.1698350424.git.andreyknvl@gmail.com>
Date: Thu, 26 Oct 2023 22:01:14 +0200
From: andrey.konovalov@...ux.dev
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc: Andrey Konovalov <andreyknvl@...il.com>,
Alan Stern <stern@...land.harvard.edu>,
Felipe Balbi <balbi@...nel.org>, linux-usb@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 3/3] usb: raw-gadget: report suspend, resume, reset, and disconnect events
From: Andrey Konovalov <andreyknvl@...il.com>
Update USB_RAW_IOCTL_EVENT_FETCH to also report suspend, resume, reset,
and disconnect events.
This allows the code that emulates a USB device via Raw Gadget to handle
these events. For example, the device can restart enumeration when it
gets reset.
Also do not print a WARNING when the event queue overflows. With these new
events being queued, the queue might overflow if the device emulation code
stops fetching events.
Also print debug messages when a non-control event is received.
Signed-off-by: Andrey Konovalov <andreyknvl@...il.com>
---
Changes v1->v2:
- Don't print another error message if event queue overflows: each
caller already prints one if event queueing fails.
---
drivers/usb/gadget/legacy/raw_gadget.c | 52 ++++++++++++++++++++++----
include/uapi/linux/usb/raw_gadget.h | 14 ++++++-
2 files changed, 56 insertions(+), 10 deletions(-)
diff --git a/drivers/usb/gadget/legacy/raw_gadget.c b/drivers/usb/gadget/legacy/raw_gadget.c
index daac1f078516..399fca32a8ac 100644
--- a/drivers/usb/gadget/legacy/raw_gadget.c
+++ b/drivers/usb/gadget/legacy/raw_gadget.c
@@ -65,7 +65,7 @@ static int raw_event_queue_add(struct raw_event_queue *queue,
struct usb_raw_event *event;
spin_lock_irqsave(&queue->lock, flags);
- if (WARN_ON(queue->size >= RAW_EVENT_QUEUE_SIZE)) {
+ if (queue->size >= RAW_EVENT_QUEUE_SIZE) {
spin_unlock_irqrestore(&queue->lock, flags);
return -ENOMEM;
}
@@ -311,9 +311,10 @@ static int gadget_bind(struct usb_gadget *gadget,
dev->eps_num = i;
spin_unlock_irqrestore(&dev->lock, flags);
+ dev_dbg(&gadget->dev, "gadget connected\n");
ret = raw_queue_event(dev, USB_RAW_EVENT_CONNECT, 0, NULL);
if (ret < 0) {
- dev_err(&gadget->dev, "failed to queue event\n");
+ dev_err(&gadget->dev, "failed to queue connect event\n");
set_gadget_data(gadget, NULL);
return ret;
}
@@ -358,7 +359,7 @@ static int gadget_setup(struct usb_gadget *gadget,
ret = raw_queue_event(dev, USB_RAW_EVENT_CONTROL, sizeof(*ctrl), ctrl);
if (ret < 0)
- dev_err(&gadget->dev, "failed to queue event\n");
+ dev_err(&gadget->dev, "failed to queue control event\n");
goto out;
out_unlock:
@@ -377,11 +378,46 @@ static int gadget_setup(struct usb_gadget *gadget,
return ret;
}
-/* These are currently unused but present in case UDC driver requires them. */
-static void gadget_disconnect(struct usb_gadget *gadget) { }
-static void gadget_suspend(struct usb_gadget *gadget) { }
-static void gadget_resume(struct usb_gadget *gadget) { }
-static void gadget_reset(struct usb_gadget *gadget) { }
+static void gadget_disconnect(struct usb_gadget *gadget)
+{
+ struct raw_dev *dev = get_gadget_data(gadget);
+ int ret;
+
+ dev_dbg(&gadget->dev, "gadget disconnected\n");
+ ret = raw_queue_event(dev, USB_RAW_EVENT_DISCONNECT, 0, NULL);
+ if (ret < 0)
+ dev_err(&gadget->dev, "failed to queue disconnect event\n");
+}
+static void gadget_suspend(struct usb_gadget *gadget)
+{
+ struct raw_dev *dev = get_gadget_data(gadget);
+ int ret;
+
+ dev_dbg(&gadget->dev, "gadget suspended\n");
+ ret = raw_queue_event(dev, USB_RAW_EVENT_SUSPEND, 0, NULL);
+ if (ret < 0)
+ dev_err(&gadget->dev, "failed to queue suspend event\n");
+}
+static void gadget_resume(struct usb_gadget *gadget)
+{
+ struct raw_dev *dev = get_gadget_data(gadget);
+ int ret;
+
+ dev_dbg(&gadget->dev, "gadget resumed\n");
+ ret = raw_queue_event(dev, USB_RAW_EVENT_RESUME, 0, NULL);
+ if (ret < 0)
+ dev_err(&gadget->dev, "failed to queue resume event\n");
+}
+static void gadget_reset(struct usb_gadget *gadget)
+{
+ struct raw_dev *dev = get_gadget_data(gadget);
+ int ret;
+
+ dev_dbg(&gadget->dev, "gadget reset\n");
+ ret = raw_queue_event(dev, USB_RAW_EVENT_RESET, 0, NULL);
+ if (ret < 0)
+ dev_err(&gadget->dev, "failed to queue reset event\n");
+}
/*----------------------------------------------------------------------*/
diff --git a/include/uapi/linux/usb/raw_gadget.h b/include/uapi/linux/usb/raw_gadget.h
index c7d2199134d7..f0224a8dc858 100644
--- a/include/uapi/linux/usb/raw_gadget.h
+++ b/include/uapi/linux/usb/raw_gadget.h
@@ -44,6 +44,16 @@ enum usb_raw_event_type {
/* This event is queued when a new control request arrived to ep0. */
USB_RAW_EVENT_CONTROL = 2,
+ /*
+ * These events are queued when the gadget driver is suspended,
+ * resumed, reset, or disconnected. Note that some UDCs (e.g. dwc2)
+ * report a disconnect event instead of a reset.
+ */
+ USB_RAW_EVENT_SUSPEND = 3,
+ USB_RAW_EVENT_RESUME = 4,
+ USB_RAW_EVENT_RESET = 5,
+ USB_RAW_EVENT_DISCONNECT = 6,
+
/* The list might grow in the future. */
};
@@ -54,8 +64,8 @@ enum usb_raw_event_type {
* actual length of the fetched event data.
* @data: A buffer to store the fetched event data.
*
- * Currently the fetched data buffer is empty for USB_RAW_EVENT_CONNECT,
- * and contains struct usb_ctrlrequest for USB_RAW_EVENT_CONTROL.
+ * The fetched event data buffer contains struct usb_ctrlrequest for
+ * USB_RAW_EVENT_CONTROL and is empty for other events.
*/
struct usb_raw_event {
__u32 type;
--
2.25.1
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