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usb: gadget: Add device attribute to determine gadget state

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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: Badhri Jagan Sridharan <Badhri@google.com>
This commit is contained in:
Badhri Jagan Sridharan 2015-08-09 15:12:50 -07:00 • committed by John Stultz
parent b9efd37bc8
commit de9e90c21e
1 changed files with 52 additions and 33 deletions
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85
drivers/usb/gadget/configfs.c
View file

@ -1597,6 +1597,54 @@ 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(
@ -1646,39 +1694,16 @@ 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;
config_group_init_type_name(&gi->group, name,
&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);
@ -1690,13 +1715,7 @@ 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 = {