[PATCH] USB: make endpoints real struct devices
This will allow for us to give endpoints a major/minor to create a "usbfs2-like" way to access endpoints directly from userspace in an easier manner than the current usbfs provides us. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>wifi-calibration
Greg Kroah-Hartman
parent
36679ea598
commit
9bde7497e0
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@ -14,13 +14,14 @@
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#include "usb.h"
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/* endpoint stuff */
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struct ep_object {
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struct ep_device {
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struct usb_endpoint_descriptor *desc;
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struct usb_device *udev;
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struct kobject kobj;
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struct device dev;
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};
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#define to_ep_object(_kobj) \
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container_of(_kobj, struct ep_object, kobj)
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#define to_ep_device(_dev) \
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container_of(_dev, struct ep_device, dev)
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struct ep_attribute {
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struct attribute attr;
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@ -30,40 +31,37 @@ struct ep_attribute {
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#define to_ep_attribute(_attr) \
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container_of(_attr, struct ep_attribute, attr)
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#define EP_ATTR(_name) \
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struct ep_attribute ep_##_name = { \
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.attr = {.name = #_name, .owner = THIS_MODULE, \
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.mode = S_IRUGO}, \
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.show = show_ep_##_name}
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#define usb_ep_attr(field, format_string) \
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static ssize_t show_ep_##field(struct usb_device *udev, \
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struct usb_endpoint_descriptor *desc, \
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char *buf) \
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static ssize_t show_ep_##field(struct device *dev, \
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struct device_attribute *attr, \
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char *buf) \
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{ \
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return sprintf(buf, format_string, desc->field); \
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struct ep_device *ep = to_ep_device(dev); \
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return sprintf(buf, format_string, ep->desc->field); \
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} \
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static EP_ATTR(field);
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static DEVICE_ATTR(field, S_IRUGO, show_ep_##field, NULL);
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usb_ep_attr(bLength, "%02x\n")
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usb_ep_attr(bEndpointAddress, "%02x\n")
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usb_ep_attr(bmAttributes, "%02x\n")
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usb_ep_attr(bInterval, "%02x\n")
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static ssize_t show_ep_wMaxPacketSize(struct usb_device *udev,
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struct usb_endpoint_descriptor *desc, char *buf)
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static ssize_t show_ep_wMaxPacketSize(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ep_device *ep = to_ep_device(dev);
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return sprintf(buf, "%04x\n",
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le16_to_cpu(desc->wMaxPacketSize) & 0x07ff);
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le16_to_cpu(ep->desc->wMaxPacketSize) & 0x07ff);
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}
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static EP_ATTR(wMaxPacketSize);
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static DEVICE_ATTR(wMaxPacketSize, S_IRUGO, show_ep_wMaxPacketSize, NULL);
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static ssize_t show_ep_type(struct usb_device *udev,
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struct usb_endpoint_descriptor *desc, char *buf)
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static ssize_t show_ep_type(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct ep_device *ep = to_ep_device(dev);
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char *type = "unknown";
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switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
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switch (ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
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case USB_ENDPOINT_XFER_CONTROL:
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type = "Control";
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break;
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@ -79,37 +77,38 @@ static ssize_t show_ep_type(struct usb_device *udev,
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}
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return sprintf(buf, "%s\n", type);
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}
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static EP_ATTR(type);
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static DEVICE_ATTR(type, S_IRUGO, show_ep_type, NULL);
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static ssize_t show_ep_interval(struct usb_device *udev,
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struct usb_endpoint_descriptor *desc, char *buf)
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static ssize_t show_ep_interval(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ep_device *ep = to_ep_device(dev);
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char unit;
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unsigned interval = 0;
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unsigned in;
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in = (desc->bEndpointAddress & USB_DIR_IN);
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in = (ep->desc->bEndpointAddress & USB_DIR_IN);
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switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
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switch (ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
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case USB_ENDPOINT_XFER_CONTROL:
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if (udev->speed == USB_SPEED_HIGH) /* uframes per NAK */
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interval = desc->bInterval;
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if (ep->udev->speed == USB_SPEED_HIGH) /* uframes per NAK */
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interval = ep->desc->bInterval;
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break;
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case USB_ENDPOINT_XFER_ISOC:
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interval = 1 << (desc->bInterval - 1);
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interval = 1 << (ep->desc->bInterval - 1);
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break;
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case USB_ENDPOINT_XFER_BULK:
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if (udev->speed == USB_SPEED_HIGH && !in) /* uframes per NAK */
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interval = desc->bInterval;
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if (ep->udev->speed == USB_SPEED_HIGH && !in) /* uframes per NAK */
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interval = ep->desc->bInterval;
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break;
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case USB_ENDPOINT_XFER_INT:
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if (udev->speed == USB_SPEED_HIGH)
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interval = 1 << (desc->bInterval - 1);
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if (ep->udev->speed == USB_SPEED_HIGH)
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interval = 1 << (ep->desc->bInterval - 1);
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else
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interval = desc->bInterval;
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interval = ep->desc->bInterval;
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break;
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}
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interval *= (udev->speed == USB_SPEED_HIGH) ? 125 : 1000;
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interval *= (ep->udev->speed == USB_SPEED_HIGH) ? 125 : 1000;
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if (interval % 1000)
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unit = 'u';
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else {
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@ -119,95 +118,158 @@ static ssize_t show_ep_interval(struct usb_device *udev,
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return sprintf(buf, "%d%cs\n", interval, unit);
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}
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static EP_ATTR(interval);
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static DEVICE_ATTR(interval, S_IRUGO, show_ep_interval, NULL);
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static ssize_t show_ep_direction(struct usb_device *udev,
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struct usb_endpoint_descriptor *desc, char *buf)
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static ssize_t show_ep_direction(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct ep_device *ep = to_ep_device(dev);
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char *direction;
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if ((desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
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if ((ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
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USB_ENDPOINT_XFER_CONTROL)
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direction = "both";
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else if (desc->bEndpointAddress & USB_DIR_IN)
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else if (ep->desc->bEndpointAddress & USB_DIR_IN)
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direction = "in";
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else
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direction = "out";
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return sprintf(buf, "%s\n", direction);
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}
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static EP_ATTR(direction);
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static DEVICE_ATTR(direction, S_IRUGO, show_ep_direction, NULL);
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static struct attribute *ep_attrs[] = {
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&ep_bLength.attr,
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&ep_bEndpointAddress.attr,
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&ep_bmAttributes.attr,
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&ep_bInterval.attr,
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&ep_wMaxPacketSize.attr,
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&ep_type.attr,
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&ep_interval.attr,
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&ep_direction.attr,
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static struct attribute *ep_dev_attrs[] = {
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&dev_attr_bLength.attr,
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&dev_attr_bEndpointAddress.attr,
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&dev_attr_bmAttributes.attr,
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&dev_attr_bInterval.attr,
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&dev_attr_wMaxPacketSize.attr,
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&dev_attr_interval.attr,
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&dev_attr_type.attr,
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&dev_attr_direction.attr,
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NULL,
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};
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static void ep_object_release(struct kobject *kobj)
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{
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kfree(to_ep_object(kobj));
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}
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static ssize_t ep_object_show(struct kobject *kobj, struct attribute *attr,
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char *buf)
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{
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struct ep_object *ep_obj = to_ep_object(kobj);
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struct ep_attribute *ep_attr = to_ep_attribute(attr);
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return (ep_attr->show)(ep_obj->udev, ep_obj->desc, buf);
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}
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static struct sysfs_ops ep_object_sysfs_ops = {
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.show = ep_object_show,
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static struct attribute_group ep_dev_attr_grp = {
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.attrs = ep_dev_attrs,
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};
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static struct kobj_type ep_object_ktype = {
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.release = ep_object_release,
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.sysfs_ops = &ep_object_sysfs_ops,
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.default_attrs = ep_attrs,
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};
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static struct endpoint_class {
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struct kref kref;
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struct class *class;
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} *ep_class;
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static int init_endpoint_class(void)
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{
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int result = 0;
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if (ep_class != NULL) {
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kref_get(&ep_class->kref);
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goto exit;
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}
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ep_class = kmalloc(sizeof(*ep_class), GFP_KERNEL);
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if (!ep_class) {
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result = -ENOMEM;
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goto exit;
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}
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kref_init(&ep_class->kref);
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ep_class->class = class_create(THIS_MODULE, "usb_endpoint");
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if (IS_ERR(ep_class->class)) {
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result = IS_ERR(ep_class->class);
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kfree(ep_class);
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ep_class = NULL;
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goto exit;
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}
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exit:
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return result;
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}
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static void release_endpoint_class(struct kref *kref)
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{
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/* Ok, we cheat as we know we only have one ep_class */
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class_destroy(ep_class->class);
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kfree(ep_class);
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ep_class = NULL;
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}
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static void destroy_endpoint_class(void)
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{
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if (ep_class)
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kref_put(&ep_class->kref, release_endpoint_class);
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}
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static void ep_device_release(struct device *dev)
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{
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struct ep_device *ep_dev = to_ep_device(dev);
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dev_dbg(dev, "%s called for %s\n", __FUNCTION__, dev->bus_id);
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kfree(ep_dev);
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}
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void usb_create_ep_files(struct device *parent,
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struct usb_host_endpoint *endpoint,
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struct usb_device *udev)
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{
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struct ep_object *ep_obj;
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struct kobject *kobj;
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char name[8];
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struct ep_device *ep_dev;
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int minor;
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int retval;
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ep_obj = kzalloc(sizeof(struct ep_object), GFP_KERNEL);
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if (!ep_obj)
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return;
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retval = init_endpoint_class();
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if (retval)
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goto exit;
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ep_obj->desc = &endpoint->desc;
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ep_obj->udev = udev;
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ep_dev = kzalloc(sizeof(*ep_dev), GFP_KERNEL);
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if (!ep_dev) {
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retval = -ENOMEM;
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goto exit;
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}
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kobj = &ep_obj->kobj;
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kobject_set_name(kobj, "ep_%02x", endpoint->desc.bEndpointAddress);
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kobj->parent = &parent->kobj;
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kobj->ktype = &ep_object_ktype;
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/* fun calculation to determine the minor of this endpoint */
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minor = (((udev->bus->busnum - 1) * 128) * 16) + (udev->devnum - 1);
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/* Don't use kobject_register, because it generates a hotplug event */
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kobject_init(kobj);
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if (kobject_add(kobj) == 0)
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endpoint->kobj = kobj;
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else
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kobject_put(kobj);
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ep_dev->desc = &endpoint->desc;
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ep_dev->udev = udev;
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ep_dev->dev.devt = MKDEV(442, minor); // FIXME fake number...
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ep_dev->dev.class = ep_class->class;
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ep_dev->dev.parent = parent;
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ep_dev->dev.release = ep_device_release;
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snprintf(ep_dev->dev.bus_id, BUS_ID_SIZE, "usbdev%d.%d_ep%02x",
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udev->bus->busnum, udev->devnum,
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endpoint->desc.bEndpointAddress);
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retval = device_register(&ep_dev->dev);
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if (retval)
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goto error;
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sysfs_create_group(&ep_dev->dev.kobj, &ep_dev_attr_grp);
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endpoint->ep_dev = ep_dev;
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/* create the symlink to the old-style "ep_XX" directory */
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sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
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sysfs_create_link(&parent->kobj, &endpoint->ep_dev->dev.kobj, name);
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exit:
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return;
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error:
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kfree(ep_dev);
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return;
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}
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void usb_remove_ep_files(struct usb_host_endpoint *endpoint)
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{
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if (endpoint->kobj) {
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kobject_del(endpoint->kobj);
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kobject_put(endpoint->kobj);
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endpoint->kobj = NULL;
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if (endpoint->ep_dev) {
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char name[8];
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sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
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sysfs_remove_link(&endpoint->ep_dev->dev.parent->kobj, name);
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sysfs_remove_group(&endpoint->ep_dev->dev.kobj, &ep_dev_attr_grp);
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device_unregister(&endpoint->ep_dev->dev);
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endpoint->ep_dev = NULL;
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}
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destroy_endpoint_class();
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}
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@ -40,6 +40,8 @@ struct usb_driver;
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* Devices may also have class-specific or vendor-specific descriptors.
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*/
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struct ep_device;
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/**
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* struct usb_host_endpoint - host-side endpoint descriptor and queue
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* @desc: descriptor for this endpoint, wMaxPacketSize in native byteorder
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@ -57,7 +59,7 @@ struct usb_host_endpoint {
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struct usb_endpoint_descriptor desc;
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struct list_head urb_list;
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void *hcpriv;
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struct kobject *kobj; /* For sysfs info */
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struct ep_device *ep_dev; /* For sysfs info */
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unsigned char *extra; /* Extra descriptors */
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int extralen;
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