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ANDROID: usb: f_accessory: Send uevent when receive control request

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Send uevent when received control request 51 and 52
to help debug and recover when the handshake not finished.

Description about control request 51 and 52
control_request 51 :
Send a 51 control request ("Get Protocol") to figure out
if the device supports the Android accessory protocol.
A non-zero number is returned if the protocol is supported,
which represents the version of the protocol that
the device supports (currently, only version 1 exists).

control_request 52 :
If the device returns a proper protocol version,
send identifying string information to the device.
This information allows the device to figure out
an appropriate application for this accessory and
also present the user with a URL if
an appropriate application does not exist.

The detail description could reference below link.
https://tool.oschina.net/uploads/apidocs/android/tools/adk/aoa.html

Bug: 139264038
Change-Id: Ie80302321b58d247a5faa83dc3cabba316743c87
Signed-off-by: rickyniu <rickyniu@google.com>
This commit is contained in:
rickyniu
2019-10-16 16:16:35 +08:00
committed by Ricky Niu
parent d75c93b6ee
commit d97894a4cb
1 changed files with 24 additions and 0 deletions
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drivers/usb/gadget/function/f_accessory.c
+24
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@@ -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;
@@ -854,6 +860,7 @@ int acc_ctrlrequest(struct usb_composite_dev *cdev,
value = 0;
cdev->req->complete = acc_complete_setup_noop;
} else if (b_request == ACCESSORY_SEND_STRING) {
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 +907,7 @@ int acc_ctrlrequest(struct usb_composite_dev *cdev,
}
} else if (b_requestType == (USB_DIR_IN | USB_TYPE_VENDOR)) {
if (b_request == ACCESSORY_GET_PROTOCOL) {
schedule_work(&dev->getprotocol_work);
*((u16 *)cdev->req->buf) = PROTOCOL_VERSION;
value = sizeof(u16);
cdev->req->complete = acc_complete_setup_noop;
@@ -1047,6 +1055,20 @@ 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 +1235,8 @@ 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;