[PATCH] USB: add endpoint information to sysfs

This patch adds endpoint information for both devices and interfaces to
sysfs.  Previously it was only possible to get the endpoint information
from usbfs, and never possible to get any information on endpoint 0.

Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

 drivers/usb/core/sysfs.c |  195 ++++++++++++++++++++++++++++++++++++++++++++++-
 include/linux/usb.h      |    4
 2 files changed, 197 insertions(+), 2 deletions(-)

drivers/usb/core/sysfs.c

@@ -22,6 +22,174 @@
 
 #include "usb.h"
 
+/* endpoint stuff */
+struct endpoint_attribute {
+	struct device_attribute dev_attr;
+	struct usb_endpoint_descriptor *endpoint;
+	struct usb_device *udev;
+};
+#define to_endpoint_attr(_dev_attr) \
+	container_of(_dev_attr, struct endpoint_attribute, dev_attr)
+
+#define usb_ep_attr(field, format_string)					\
+static ssize_t show_ep_##field(struct device *dev, struct device_attribute *attr,	\
+			    char *buf)						\
+{										\
+	struct endpoint_attribute *endpoint_attr = to_endpoint_attr(attr);	\
+										\
+	return sprintf(buf, format_string, endpoint_attr->endpoint->field);	\
+}
+usb_ep_attr(bLength, "%02x\n")
+usb_ep_attr(bDescriptorType, "%02x\n")
+usb_ep_attr(bEndpointAddress, "%02x\n")
+usb_ep_attr(bmAttributes, "%02x\n")
+usb_ep_attr(bInterval, "%02x\n")
+
+static ssize_t show_ep_wMaxPacketSize(struct device *dev,
+				      struct device_attribute *attr, char *buf)
+{
+	struct endpoint_attribute *endpoint_attr = to_endpoint_attr(attr);
+
+	return sprintf(buf, "%04x\n",
+		      le16_to_cpu(endpoint_attr->endpoint->wMaxPacketSize) & 0x07ff);
+}
+
+static ssize_t show_ep_type(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct endpoint_attribute *endpoint_attr = to_endpoint_attr(attr);
+	char *type = "unknown";
+
+	switch (endpoint_attr->endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+	case USB_ENDPOINT_XFER_CONTROL:
+		type = "Control";
+		break;
+	case USB_ENDPOINT_XFER_ISOC:
+		type = "Isoc";
+		break;
+	case USB_ENDPOINT_XFER_BULK:
+		type = "Bulk";
+		break;
+	case USB_ENDPOINT_XFER_INT:
+		type = "Interrupt";
+		break;
+	}
+	return sprintf(buf, "%s\n", type);
+}
+
+static ssize_t show_ep_interval(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct endpoint_attribute *endpoint_attr = to_endpoint_attr(attr);
+	struct usb_device *udev = endpoint_attr->udev;
+	struct usb_endpoint_descriptor *endpoint = endpoint_attr->endpoint;
+	char unit;
+	unsigned interval = 0;
+	unsigned in;
+
+	in = (endpoint->bEndpointAddress & USB_DIR_IN);
+
+	switch (endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
+	case USB_ENDPOINT_XFER_CONTROL:
+		if (udev->speed == USB_SPEED_HIGH) 	/* uframes per NAK */
+			interval = endpoint->bInterval;
+		break;
+	case USB_ENDPOINT_XFER_ISOC:
+		interval = 1 << (endpoint->bInterval - 1);
+		break;
+	case USB_ENDPOINT_XFER_BULK:
+		if (udev->speed == USB_SPEED_HIGH && !in)	/* uframes per NAK */
+			interval = endpoint->bInterval;
+		break;
+	case USB_ENDPOINT_XFER_INT:
+		if (udev->speed == USB_SPEED_HIGH) {
+			interval = 1 << (endpoint->bInterval - 1);
+		} else
+			interval = endpoint->bInterval;
+		break;
+	}
+	interval *= (udev->speed == USB_SPEED_HIGH) ? 125 : 1000;
+	if (interval % 1000)
+		unit = 'u';
+	else {
+		unit = 'm';
+		interval /= 1000;
+	}
+
+	return sprintf(buf, "%d%cs\n", interval, unit);
+}
+
+static ssize_t show_ep_direction(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct endpoint_attribute *endpoint_attr = to_endpoint_attr(attr);
+	char *direction;
+
+	if ((endpoint_attr->endpoint->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
+	    USB_ENDPOINT_XFER_CONTROL)
+		direction = "both";
+	else if (endpoint_attr->endpoint->bEndpointAddress & USB_DIR_IN)
+		direction = "in";
+	else
+		direction = "out";
+	return sprintf(buf, "%s\n", direction);
+}
+
+static struct endpoint_attribute *create_ep_attr(struct usb_endpoint_descriptor *endpoint,
+						 struct usb_device *udev, char *name,
+		ssize_t (*show)(struct device *dev, struct device_attribute *attr, char *buf))
+{
+	struct endpoint_attribute *ep_attr;
+
+	ep_attr = kzalloc(sizeof(*ep_attr), GFP_KERNEL);
+	if (ep_attr) {
+		ep_attr->endpoint = endpoint;
+		ep_attr->udev = udev;
+		ep_attr->dev_attr.attr.name = name;
+		ep_attr->dev_attr.attr.mode = 0444;
+		ep_attr->dev_attr.attr.owner = THIS_MODULE;
+		ep_attr->dev_attr.show = show;
+	}
+	return ep_attr;
+}
+
+static void usb_create_ep_files(struct kobject *kobj, struct usb_host_endpoint *endpoint, struct usb_device *udev)
+{
+	struct usb_endpoint_descriptor *ep;
+
+	ep = &endpoint->desc;
+
+	endpoint->attrs = kzalloc(sizeof(struct attribute *) * 10, GFP_KERNEL);
+	endpoint->attrs[0] = &(create_ep_attr(ep, udev, "direction", show_ep_direction)->dev_attr.attr);
+	endpoint->attrs[1] = &(create_ep_attr(ep, udev, "type", show_ep_type)->dev_attr.attr);
+	endpoint->attrs[2] = &(create_ep_attr(ep, udev, "bLength", show_ep_bLength)->dev_attr.attr);
+	endpoint->attrs[3] = &(create_ep_attr(ep, udev, "bDescriptorType", show_ep_bDescriptorType)->dev_attr.attr);
+	endpoint->attrs[4] = &(create_ep_attr(ep, udev, "bEndpointAddress", show_ep_bEndpointAddress)->dev_attr.attr);
+	endpoint->attrs[5] = &(create_ep_attr(ep, udev, "bmAttributes", show_ep_bmAttributes)->dev_attr.attr);
+	endpoint->attrs[6] = &(create_ep_attr(ep, udev, "wMaxPacketSize", show_ep_wMaxPacketSize)->dev_attr.attr);
+	endpoint->attrs[7] = &(create_ep_attr(ep, udev, "bInterval", show_ep_bInterval)->dev_attr.attr);
+	endpoint->attrs[8] = &(create_ep_attr(ep, udev, "interval", show_ep_interval)->dev_attr.attr);
+	endpoint->attrs[9] = NULL;
+	endpoint->num_attrs = 9;
+
+	endpoint->attr_group = kzalloc(sizeof(*endpoint->attr_group), GFP_KERNEL);
+	endpoint->attr_name = kzalloc(10, GFP_KERNEL);
+	sprintf(endpoint->attr_name, "ep_%02x", endpoint->desc.bEndpointAddress);
+
+	endpoint->attr_group->attrs = endpoint->attrs;
+	endpoint->attr_group->name = endpoint->attr_name;
+	sysfs_create_group(kobj, endpoint->attr_group);
+}
+
+static void usb_remove_ep_files(struct kobject *kobj, struct usb_host_endpoint *endpoint)
+{
+	int i;
+
+	sysfs_remove_group(kobj, endpoint->attr_group);
+	kfree(endpoint->attr_group);
+	kfree(endpoint->attr_name);
+	for (i = 0; i < endpoint->num_attrs; ++i)
+		kfree(endpoint->attrs[i]);
+	kfree(endpoint->attrs);
+}
+
 /* Active configuration fields */
 #define usb_actconfig_show(field, multiplier, format_string)		\
 static ssize_t  show_##field (struct device *dev, struct device_attribute *attr, char *buf)		\
@@ -236,12 +404,14 @@ void usb_create_sysfs_dev_files (struct usb_device *udev)
 	if (udev->serial)
 		device_create_file (dev, &dev_attr_serial);
 	device_create_file (dev, &dev_attr_configuration);
+	usb_create_ep_files(&dev->kobj, &udev->ep0, udev);
 }
 
 void usb_remove_sysfs_dev_files (struct usb_device *udev)
 {
 	struct device *dev = &udev->dev;
 
+	usb_remove_ep_files(&dev->kobj, &udev->ep0);
 	sysfs_remove_group(&dev->kobj, &dev_attr_grp);
 
 	if (udev->descriptor.iManufacturer)
@@ -333,20 +503,41 @@ static struct attribute_group intf_attr_grp = {
 	.attrs = intf_attrs,
 };
 
+static void usb_create_intf_ep_files(struct usb_interface *intf)
+{
+	struct usb_host_interface *iface_desc;
+	int i;
+
+	iface_desc = intf->cur_altsetting;
+	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
+		usb_create_ep_files(&intf->dev.kobj, &iface_desc->endpoint[i],
+				    interface_to_usbdev(intf));
+}
+
+static void usb_remove_intf_ep_files(struct usb_interface *intf)
+{
+	struct usb_host_interface *iface_desc;
+	int i;
+
+	iface_desc = intf->cur_altsetting;
+	for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i)
+		usb_remove_ep_files(&intf->dev.kobj, &iface_desc->endpoint[i]);
+}
+
 void usb_create_sysfs_intf_files (struct usb_interface *intf)
 {
 	sysfs_create_group(&intf->dev.kobj, &intf_attr_grp);
 
 	if (intf->cur_altsetting->string)
 		device_create_file(&intf->dev, &dev_attr_interface);
-		
+	usb_create_intf_ep_files(intf);
 }
 
 void usb_remove_sysfs_intf_files (struct usb_interface *intf)
 {
+	usb_remove_intf_ep_files(intf);
 	sysfs_remove_group(&intf->dev.kobj, &intf_attr_grp);
 
 	if (intf->cur_altsetting->string)
 		device_remove_file(&intf->dev, &dev_attr_interface);
-
 }

include/linux/usb.h

@@ -57,6 +57,10 @@ struct usb_host_endpoint {
 	struct usb_endpoint_descriptor	desc;
 	struct list_head		urb_list;
 	void				*hcpriv;
+	char 				*attr_name;
+	struct attribute_group		*attr_group;
+	struct attribute 		**attrs;
+	int				num_attrs;
 
 	unsigned char *extra;   /* Extra descriptors */
 	int extralen;