linux-kernel - [PATCH 3/3] ANDROID: usb: f_accessory: send uevent for 51,52 requests

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Date:   Mon, 12 Oct 2020 19:10:24 +0800
From:   rickyniu <rickyniu@...gle.com>
To:     balbi@...nel.org, gregkh@...uxfoundation.org, astrachan@...gle.com,
        rickyniu@...gle.com, amit.pundir@...aro.org, lockwood@...roid.com,
        benoit@...roid.com, jackp@...eaurora.org, vvreddy@...eaurora.org
Cc:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
        kyletso@...gle.com
Subject: [PATCH 3/3] ANDROID: usb: f_accessory: send uevent for 51,52 requests

Add more log between accessory device and host to help debug.
Send the uevent when the host gets ctrl_request 51 and 52 to user space.
Let user space know the current connect status.

Signed-off-by: rickyniu <rickyniu@...gle.com>
---
 drivers/usb/gadget/function/f_accessory.c | 30 +++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/drivers/usb/gadget/function/f_accessory.c b/drivers/usb/gadget/function/f_accessory.c
index 5ed80940b9bf..e51cab9246f9 100644
--- a/drivers/usb/gadget/function/f_accessory.c
+++ b/drivers/usb/gadget/function/f_accessory.c
@@ -117,6 +117,12 @@ struct acc_dev {
 	/* delayed work for handling ACCESSORY_START */
 	struct delayed_work start_work;
 
+	/* work for handling ACCESSORY GET PROTOCOL */
+	struct work_struct getprotocol_work;
+
+	/* work for handling ACCESSORY SEND STRING */
+	struct work_struct sendstring_work;
+
 	/* worker for registering and unregistering hid devices */
 	struct work_struct hid_work;
 
@@ -849,11 +855,16 @@ int acc_ctrlrequest(struct usb_composite_dev *cdev,
 	if (b_requestType == (USB_DIR_OUT | USB_TYPE_VENDOR)) {
 		if (b_request == ACCESSORY_START) {
 			dev->start_requested = 1;
+			dev_info(&cdev->gadget->dev, "%s: got ACCESSORY_START(53) request\n",
+				__func__);
 			schedule_delayed_work(
 				&dev->start_work, msecs_to_jiffies(10));
 			value = 0;
 			cdev->req->complete = acc_complete_setup_noop;
 		} else if (b_request == ACCESSORY_SEND_STRING) {
+			dev_info(&cdev->gadget->dev, "%s: got ACCESSORY_SEND_STRING(52) request\n",
+				__func__);
+			schedule_work(&dev->sendstring_work);
 			dev->string_index = w_index;
 			cdev->gadget->ep0->driver_data = dev;
 			cdev->req->complete = acc_complete_set_string;
@@ -900,6 +911,9 @@ int acc_ctrlrequest(struct usb_composite_dev *cdev,
 		}
 	} else if (b_requestType == (USB_DIR_IN | USB_TYPE_VENDOR)) {
 		if (b_request == ACCESSORY_GET_PROTOCOL) {
+			dev_info(&cdev->gadget->dev, "%s: got ACCESSORY_GET_PROTOCOL(51) request\n",
+				__func__);
+			schedule_work(&dev->getprotocol_work);
 			*((u16 *)cdev->req->buf) = PROTOCOL_VERSION;
 			value = sizeof(u16);
 			cdev->req->complete = acc_complete_setup_noop;
@@ -1047,6 +1061,20 @@ acc_function_unbind(struct usb_configuration *c, struct usb_function *f)
 	acc_hid_unbind(dev);
 }
 
+static void acc_getprotocol_work(struct work_struct *data)
+{
+	char *envp[2] = { "ACCESSORY=GETPROTOCOL", NULL };
+
+	kobject_uevent_env(&acc_device.this_device->kobj, KOBJ_CHANGE, envp);
+}
+
+static void acc_sendstring_work(struct work_struct *data)
+{
+	char *envp[2] = { "ACCESSORY=SENDSTRING", NULL };
+
+	kobject_uevent_env(&acc_device.this_device->kobj, KOBJ_CHANGE, envp);
+}
+
 static void acc_start_work(struct work_struct *data)
 {
 	char *envp[2] = { "ACCESSORY=START", NULL };
@@ -1213,6 +1241,8 @@ static int acc_setup(void)
 	INIT_LIST_HEAD(&dev->dead_hid_list);
 	INIT_DELAYED_WORK(&dev->start_work, acc_start_work);
 	INIT_WORK(&dev->hid_work, acc_hid_work);
+	INIT_WORK(&dev->getprotocol_work, acc_getprotocol_work);
+	INIT_WORK(&dev->sendstring_work, acc_sendstring_work);
 
 	/* _acc_dev must be set before calling usb_gadget_register_driver */
 	_acc_dev = dev;
-- 
2.28.0.1011.ga647a8990f-goog