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Commit 49209714 authored by Badhri Jagan Sridharan's avatar Badhri Jagan Sridharan
Browse files

usb: gadget: Add device attribute to determine gadget state 



Android frameworks (UsbDeviceManager) relies on gadget state exported
through device attributes.  This CL adds the device attribute to export
USB gadget state.

Change-Id: Id0391810d75b58c579610fbec6e37ab22f28886d
Signed-off-by: default avatarBadhri Jagan Sridharan <Badhri@google.com>
parent 9ff158f4

drivers/usb/gadget/configfs.c

+52 −33
Original line number Diff line number Diff line
@@ -1647,6 +1647,54 @@ static struct device_attribute *android_usb_attributes[] = { 
	&dev_attr_state,

	NULL

};



static int android_device_create(struct gadget_info *gi)

{

	struct device_attribute **attrs;

	struct device_attribute *attr;



	INIT_WORK(&gi->work, android_work);

	android_device = device_create(android_class, NULL,

				MKDEV(0, 0), NULL, "android0");

	if (IS_ERR(android_device))

		return PTR_ERR(android_device);



	dev_set_drvdata(android_device, gi);



	attrs = android_usb_attributes;

	while ((attr = *attrs++)) {

		int err;



		err = device_create_file(android_device, attr);

		if (err) {

			device_destroy(android_device->class,

				       android_device->devt);

			return err;

		}

	}



	return 0;

}



static void android_device_destroy(void)

{

	struct device_attribute **attrs;

	struct device_attribute *attr;



	attrs = android_usb_attributes;

	while ((attr = *attrs++))

		device_remove_file(android_device, attr);

	device_destroy(android_device->class, android_device->devt);

}

#else

static inline int android_device_create(struct gadget_info *gi)

{

	return 0;

}



static inline void android_device_destroy(void)

{

}

#endif



static struct config_group *gadgets_make(
@@ -1696,25 +1744,11 @@ static struct config_group *gadgets_make( 
	gi->composite.gadget_driver.function = kstrdup(name, GFP_KERNEL);

	gi->composite.name = gi->composite.gadget_driver.function;



#ifdef CONFIG_USB_CONFIGFS_UEVENT

	INIT_WORK(&gi->work, android_work);

	android_device = device_create(android_class, NULL,

				MKDEV(0, 0), NULL, "android0");

	if (IS_ERR(android_device))

	if (!gi->composite.gadget_driver.function)

		goto err;



	dev_set_drvdata(android_device, gi);



	attrs = android_usb_attributes;

	while ((attr = *attrs++)) {

		err = device_create_file(android_device, attr);

		if (err)

			goto err1;

	}

#endif



	if (!gi->composite.gadget_driver.function)

		goto err1;

	if (android_device_create(gi) < 0)

		goto err;



#ifdef CONFIG_USB_OTG

	gi->otg.bLength = sizeof(struct usb_otg_descriptor);
@@ -1726,15 +1760,6 @@ static struct config_group *gadgets_make( 
				&gadget_root_type);

	return &gi->group;



err1:

#ifdef CONFIG_USB_CONFIGFS_UEVENT

	attrs = android_usb_attributes;

	while ((attr = *attrs++))

		device_remove_file(android_device, attr);



	device_destroy(android_device->class,

				android_device->devt);

#endif

err:

	kfree(gi);

	return ERR_PTR(-ENOMEM);
@@ -1746,13 +1771,7 @@ static void gadgets_drop(struct config_group *group, struct config_item *item) 
	struct device_attribute *attr;



	config_item_put(item);



#ifdef CONFIG_USB_CONFIGFS_UEVENT

	attrs = android_usb_attributes;

	while ((attr = *attrs++))

		device_remove_file(android_device, attr);

	device_destroy(android_device->class, android_device->devt);

#endif

	android_device_destroy();

}



static struct configfs_group_operations gadgets_ops = {