USB: Composite framework: Add suspended sysfs entry
This patch adds a sysfs entry (/sys/devices/platform/_UDC_/gadget/suspended) to
show the suspend state of an USB composite gadget.
Signed-off-by: Fabien Chouteau <fabien.chouteau@barco.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c
index 5465d87..f9aff1b 100644
--- a/drivers/usb/gadget/composite.c
+++ b/drivers/usb/gadget/composite.c
@@ -898,6 +898,18 @@
/*-------------------------------------------------------------------------*/
+static ssize_t composite_show_suspended(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct usb_gadget *gadget = dev_to_usb_gadget(dev);
+ struct usb_composite_dev *cdev = get_gadget_data(gadget);
+
+ return sprintf(buf, "%d\n", cdev->suspended);
+}
+
+static DEVICE_ATTR(suspended, 0444, composite_show_suspended, NULL);
+
static void /* __init_or_exit */
composite_unbind(struct usb_gadget *gadget)
{
@@ -944,6 +956,7 @@
}
kfree(cdev);
set_gadget_data(gadget, NULL);
+ device_remove_file(&gadget->dev, &dev_attr_suspended);
composite = NULL;
}
@@ -1036,6 +1049,10 @@
string_override(composite->strings,
cdev->desc.iSerialNumber, iSerialNumber);
+ status = device_create_file(&gadget->dev, &dev_attr_suspended);
+ if (status)
+ goto fail;
+
INFO(cdev, "%s ready\n", composite->name);
return 0;
@@ -1064,6 +1081,8 @@
}
if (composite->suspend)
composite->suspend(cdev);
+
+ cdev->suspended = 1;
}
static void
@@ -1084,6 +1103,8 @@
f->resume(f);
}
}
+
+ cdev->suspended = 0;
}
/*-------------------------------------------------------------------------*/