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[PATCH] USB: make endpoints real struct devices

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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>
This commit is contained in:
Greg Kroah-Hartman 2006-06-14 12:14:34 -07:00
parent 36679ea598
commit 9bde7497e0
2 changed files with 159 additions and 95 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

250
drivers/usb/core/endpoint.c
View file

@ -14,13 +14,14 @@
#include "usb.h" #include "usb.h"
/* endpoint stuff */ /* endpoint stuff */
struct ep_object {
struct ep_device {
struct usb_endpoint_descriptor *desc; struct usb_endpoint_descriptor *desc;
struct usb_device *udev; struct usb_device *udev;
struct kobject kobj; struct device dev;
}; };
#define to_ep_object(_kobj) \ #define to_ep_device(_dev) \
container_of(_kobj, struct ep_object, kobj) container_of(_dev, struct ep_device, dev)
struct ep_attribute { struct ep_attribute {
struct attribute attr; struct attribute attr;
@ -30,40 +31,37 @@ struct ep_attribute {
#define to_ep_attribute(_attr) \ #define to_ep_attribute(_attr) \
container_of(_attr, struct ep_attribute, attr) container_of(_attr, struct ep_attribute, attr)
#define EP_ATTR(_name) \
struct ep_attribute ep_##_name = { \
.attr = {.name = #_name, .owner = THIS_MODULE, \
.mode = S_IRUGO}, \
.show = show_ep_##_name}
#define usb_ep_attr(field, format_string) \ #define usb_ep_attr(field, format_string) \
static ssize_t show_ep_##field(struct usb_device *udev, \ static ssize_t show_ep_##field(struct device *dev, \
struct usb_endpoint_descriptor *desc, \ struct device_attribute *attr, \
char *buf) \ char *buf) \
{ \ { \
return sprintf(buf, format_string, desc->field); \ struct ep_device *ep = to_ep_device(dev); \
return sprintf(buf, format_string, ep->desc->field); \
} \ } \
static EP_ATTR(field); static DEVICE_ATTR(field, S_IRUGO, show_ep_##field, NULL);
usb_ep_attr(bLength, "%02x\n") usb_ep_attr(bLength, "%02x\n")
usb_ep_attr(bEndpointAddress, "%02x\n") usb_ep_attr(bEndpointAddress, "%02x\n")
usb_ep_attr(bmAttributes, "%02x\n") usb_ep_attr(bmAttributes, "%02x\n")
usb_ep_attr(bInterval, "%02x\n") usb_ep_attr(bInterval, "%02x\n")
static ssize_t show_ep_wMaxPacketSize(struct usb_device *udev, static ssize_t show_ep_wMaxPacketSize(struct device *dev,
struct usb_endpoint_descriptor *desc, char *buf) struct device_attribute *attr, char *buf)
{ {
struct ep_device *ep = to_ep_device(dev);
return sprintf(buf, "%04x\n", return sprintf(buf, "%04x\n",
le16_to_cpu(desc->wMaxPacketSize) & 0x07ff); le16_to_cpu(ep->desc->wMaxPacketSize) & 0x07ff);
} }
static EP_ATTR(wMaxPacketSize); static DEVICE_ATTR(wMaxPacketSize, S_IRUGO, show_ep_wMaxPacketSize, NULL);
static ssize_t show_ep_type(struct usb_device *udev, static ssize_t show_ep_type(struct device *dev, struct device_attribute *attr,
struct usb_endpoint_descriptor *desc, char *buf) char *buf)
{ {
struct ep_device *ep = to_ep_device(dev);
char *type = "unknown"; char *type = "unknown";
switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) { switch (ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
case USB_ENDPOINT_XFER_CONTROL: case USB_ENDPOINT_XFER_CONTROL:
type = "Control"; type = "Control";
break; break;
@ -79,37 +77,38 @@ static ssize_t show_ep_type(struct usb_device *udev,
} }
return sprintf(buf, "%s\n", type); return sprintf(buf, "%s\n", type);
} }
static EP_ATTR(type); static DEVICE_ATTR(type, S_IRUGO, show_ep_type, NULL);
static ssize_t show_ep_interval(struct usb_device *udev, static ssize_t show_ep_interval(struct device *dev,
struct usb_endpoint_descriptor *desc, char *buf) struct device_attribute *attr, char *buf)
{ {
struct ep_device *ep = to_ep_device(dev);
char unit; char unit;
unsigned interval = 0; unsigned interval = 0;
unsigned in; unsigned in;
in = (desc->bEndpointAddress & USB_DIR_IN); in = (ep->desc->bEndpointAddress & USB_DIR_IN);
switch (desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) { switch (ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) {
case USB_ENDPOINT_XFER_CONTROL: case USB_ENDPOINT_XFER_CONTROL:
if (udev->speed == USB_SPEED_HIGH) /* uframes per NAK */ if (ep->udev->speed == USB_SPEED_HIGH) /* uframes per NAK */
interval = desc->bInterval; interval = ep->desc->bInterval;
break; break;
case USB_ENDPOINT_XFER_ISOC: case USB_ENDPOINT_XFER_ISOC:
interval = 1 << (desc->bInterval - 1); interval = 1 << (ep->desc->bInterval - 1);
break; break;
case USB_ENDPOINT_XFER_BULK: case USB_ENDPOINT_XFER_BULK:
if (udev->speed == USB_SPEED_HIGH && !in) /* uframes per NAK */ if (ep->udev->speed == USB_SPEED_HIGH && !in) /* uframes per NAK */
interval = desc->bInterval; interval = ep->desc->bInterval;
break; break;
case USB_ENDPOINT_XFER_INT: case USB_ENDPOINT_XFER_INT:
if (udev->speed == USB_SPEED_HIGH) if (ep->udev->speed == USB_SPEED_HIGH)
interval = 1 << (desc->bInterval - 1); interval = 1 << (ep->desc->bInterval - 1);
else else
interval = desc->bInterval; interval = ep->desc->bInterval;
break; break;
} }
interval *= (udev->speed == USB_SPEED_HIGH) ? 125 : 1000; interval *= (ep->udev->speed == USB_SPEED_HIGH) ? 125 : 1000;
if (interval % 1000) if (interval % 1000)
unit = 'u'; unit = 'u';
else { else {
@ -119,95 +118,158 @@ static ssize_t show_ep_interval(struct usb_device *udev,
return sprintf(buf, "%d%cs\n", interval, unit); return sprintf(buf, "%d%cs\n", interval, unit);
} }
static EP_ATTR(interval); static DEVICE_ATTR(interval, S_IRUGO, show_ep_interval, NULL);
static ssize_t show_ep_direction(struct usb_device *udev, static ssize_t show_ep_direction(struct device *dev,
struct usb_endpoint_descriptor *desc, char *buf) struct device_attribute *attr, char *buf)
{ {
struct ep_device *ep = to_ep_device(dev);
char *direction; char *direction;
if ((desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == if ((ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
USB_ENDPOINT_XFER_CONTROL) USB_ENDPOINT_XFER_CONTROL)
direction = "both"; direction = "both";
else if (desc->bEndpointAddress & USB_DIR_IN) else if (ep->desc->bEndpointAddress & USB_DIR_IN)
direction = "in"; direction = "in";
else else
direction = "out"; direction = "out";
return sprintf(buf, "%s\n", direction); return sprintf(buf, "%s\n", direction);
} }
static EP_ATTR(direction); static DEVICE_ATTR(direction, S_IRUGO, show_ep_direction, NULL);
static struct attribute *ep_attrs[] = { static struct attribute *ep_dev_attrs[] = {
&ep_bLength.attr, &dev_attr_bLength.attr,
&ep_bEndpointAddress.attr, &dev_attr_bEndpointAddress.attr,
&ep_bmAttributes.attr, &dev_attr_bmAttributes.attr,
&ep_bInterval.attr, &dev_attr_bInterval.attr,
&ep_wMaxPacketSize.attr, &dev_attr_wMaxPacketSize.attr,
&ep_type.attr, &dev_attr_interval.attr,
&ep_interval.attr, &dev_attr_type.attr,
&ep_direction.attr, &dev_attr_direction.attr,
NULL, NULL,
}; };
static struct attribute_group ep_dev_attr_grp = {
static void ep_object_release(struct kobject *kobj) .attrs = ep_dev_attrs,
{
kfree(to_ep_object(kobj));
}
static ssize_t ep_object_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
struct ep_object *ep_obj = to_ep_object(kobj);
struct ep_attribute *ep_attr = to_ep_attribute(attr);
return (ep_attr->show)(ep_obj->udev, ep_obj->desc, buf);
}
static struct sysfs_ops ep_object_sysfs_ops = {
.show = ep_object_show,
}; };
static struct kobj_type ep_object_ktype = { static struct endpoint_class {
.release = ep_object_release, struct kref kref;
.sysfs_ops = &ep_object_sysfs_ops, struct class *class;
.default_attrs = ep_attrs, } *ep_class;
};
static int init_endpoint_class(void)
{
int result = 0;
if (ep_class != NULL) {
kref_get(&ep_class->kref);
goto exit;
}
ep_class = kmalloc(sizeof(*ep_class), GFP_KERNEL);
if (!ep_class) {
result = -ENOMEM;
goto exit;
}
kref_init(&ep_class->kref);
ep_class->class = class_create(THIS_MODULE, "usb_endpoint");
if (IS_ERR(ep_class->class)) {
result = IS_ERR(ep_class->class);
kfree(ep_class);
ep_class = NULL;
goto exit;
}
exit:
return result;
}
static void release_endpoint_class(struct kref *kref)
{
/* Ok, we cheat as we know we only have one ep_class */
class_destroy(ep_class->class);
kfree(ep_class);
ep_class = NULL;
}
static void destroy_endpoint_class(void)
{
if (ep_class)
kref_put(&ep_class->kref, release_endpoint_class);
}
static void ep_device_release(struct device *dev)
{
struct ep_device *ep_dev = to_ep_device(dev);
dev_dbg(dev, "%s called for %s\n", __FUNCTION__, dev->bus_id);
kfree(ep_dev);
}
void usb_create_ep_files(struct device *parent, void usb_create_ep_files(struct device *parent,
struct usb_host_endpoint *endpoint, struct usb_host_endpoint *endpoint,
struct usb_device *udev) struct usb_device *udev)
{ {
struct ep_object *ep_obj; char name[8];
struct kobject *kobj; struct ep_device *ep_dev;
int minor;
int retval;
ep_obj = kzalloc(sizeof(struct ep_object), GFP_KERNEL); retval = init_endpoint_class();
if (!ep_obj) if (retval)
return; goto exit;
ep_obj->desc = &endpoint->desc; ep_dev = kzalloc(sizeof(*ep_dev), GFP_KERNEL);
ep_obj->udev = udev; if (!ep_dev) {
retval = -ENOMEM;
goto exit;
}
kobj = &ep_obj->kobj; /* fun calculation to determine the minor of this endpoint */
kobject_set_name(kobj, "ep_%02x", endpoint->desc.bEndpointAddress); minor = (((udev->bus->busnum - 1) * 128) * 16) + (udev->devnum - 1);
kobj->parent = &parent->kobj;
kobj->ktype = &ep_object_ktype;
/* Don't use kobject_register, because it generates a hotplug event */ ep_dev->desc = &endpoint->desc;
kobject_init(kobj); ep_dev->udev = udev;
if (kobject_add(kobj) == 0) ep_dev->dev.devt = MKDEV(442, minor); // FIXME fake number...
endpoint->kobj = kobj; ep_dev->dev.class = ep_class->class;
else ep_dev->dev.parent = parent;
kobject_put(kobj); ep_dev->dev.release = ep_device_release;
snprintf(ep_dev->dev.bus_id, BUS_ID_SIZE, "usbdev%d.%d_ep%02x",
udev->bus->busnum, udev->devnum,
endpoint->desc.bEndpointAddress);
retval = device_register(&ep_dev->dev);
if (retval)
goto error;
sysfs_create_group(&ep_dev->dev.kobj, &ep_dev_attr_grp);
endpoint->ep_dev = ep_dev;
/* create the symlink to the old-style "ep_XX" directory */
sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
sysfs_create_link(&parent->kobj, &endpoint->ep_dev->dev.kobj, name);
exit:
return;
error:
kfree(ep_dev);
return;
} }
void usb_remove_ep_files(struct usb_host_endpoint *endpoint) void usb_remove_ep_files(struct usb_host_endpoint *endpoint)
{ {
if (endpoint->kobj) { if (endpoint->ep_dev) {
kobject_del(endpoint->kobj); char name[8];
kobject_put(endpoint->kobj);
endpoint->kobj = NULL; sprintf(name, "ep_%02x", endpoint->desc.bEndpointAddress);
sysfs_remove_link(&endpoint->ep_dev->dev.parent->kobj, name);
sysfs_remove_group(&endpoint->ep_dev->dev.kobj, &ep_dev_attr_grp);
device_unregister(&endpoint->ep_dev->dev);
endpoint->ep_dev = NULL;
} }
destroy_endpoint_class();
} }

4
include/linux/usb.h
View file

@ -40,6 +40,8 @@ struct usb_driver;
* Devices may also have class-specific or vendor-specific descriptors. * Devices may also have class-specific or vendor-specific descriptors.
*/ */
struct ep_device;
/** /**
* struct usb_host_endpoint - host-side endpoint descriptor and queue * struct usb_host_endpoint - host-side endpoint descriptor and queue
* @desc: descriptor for this endpoint, wMaxPacketSize in native byteorder * @desc: descriptor for this endpoint, wMaxPacketSize in native byteorder
@ -57,7 +59,7 @@ struct usb_host_endpoint {
struct usb_endpoint_descriptor desc; struct usb_endpoint_descriptor desc;
struct list_head urb_list; struct list_head urb_list;
void *hcpriv; void *hcpriv;
struct kobject *kobj; /* For sysfs info */ struct ep_device *ep_dev; /* For sysfs info */
unsigned char *extra; /* Extra descriptors */ unsigned char *extra; /* Extra descriptors */
int extralen; int extralen;