diff options
Diffstat (limited to 'drivers/usb/core/endpoint.c')
| -rw-r--r-- | drivers/usb/core/endpoint.c | 275 |
1 files changed, 275 insertions, 0 deletions
diff --git a/drivers/usb/core/endpoint.c b/drivers/usb/core/endpoint.c new file mode 100644 index 000000000000..247b5a4913a8 --- /dev/null +++ b/drivers/usb/core/endpoint.c @@ -0,0 +1,275 @@ +/* + * drivers/usb/core/endpoint.c + * + * (C) Copyright 2002,2004,2006 Greg Kroah-Hartman + * (C) Copyright 2002,2004 IBM Corp. + * (C) Copyright 2006 Novell Inc. + * + * Endpoint sysfs stuff + * + */ + +#include <linux/kernel.h> +#include <linux/usb.h> +#include "usb.h" + +/* endpoint stuff */ + +struct ep_device { + struct usb_endpoint_descriptor *desc; + struct usb_device *udev; + struct device dev; +}; +#define to_ep_device(_dev) \ + container_of(_dev, struct ep_device, dev) + +struct ep_attribute { + struct attribute attr; + ssize_t (*show)(struct usb_device *, + struct usb_endpoint_descriptor *, char *); +}; +#define to_ep_attribute(_attr) \ + container_of(_attr, struct ep_attribute, attr) + +#define usb_ep_attr(field, format_string) \ +static ssize_t show_ep_##field(struct device *dev, \ + struct device_attribute *attr, \ + char *buf) \ +{ \ + struct ep_device *ep = to_ep_device(dev); \ + return sprintf(buf, format_string, ep->desc->field); \ +} \ +static DEVICE_ATTR(field, S_IRUGO, show_ep_##field, NULL); + +usb_ep_attr(bLength, "%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 ep_device *ep = to_ep_device(dev); + return sprintf(buf, "%04x\n", + le16_to_cpu(ep->desc->wMaxPacketSize) & 0x07ff); +} +static DEVICE_ATTR(wMaxPacketSize, S_IRUGO, show_ep_wMaxPacketSize, NULL); + +static ssize_t show_ep_type(struct device *dev, struct device_attribute *attr, + char *buf) +{ + struct ep_device *ep = to_ep_device(dev); + char *type = "unknown"; + + switch (ep->desc->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 DEVICE_ATTR(type, S_IRUGO, show_ep_type, NULL); + +static ssize_t show_ep_interval(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ep_device *ep = to_ep_device(dev); + char unit; + unsigned interval = 0; + unsigned in; + + in = (ep->desc->bEndpointAddress & USB_DIR_IN); + + switch (ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) { + case USB_ENDPOINT_XFER_CONTROL: + if (ep->udev->speed == USB_SPEED_HIGH) /* uframes per NAK */ + interval = ep->desc->bInterval; + break; + case USB_ENDPOINT_XFER_ISOC: + interval = 1 << (ep->desc->bInterval - 1); + break; + case USB_ENDPOINT_XFER_BULK: + if (ep->udev->speed == USB_SPEED_HIGH && !in) /* uframes per NAK */ + interval = ep->desc->bInterval; + break; + case USB_ENDPOINT_XFER_INT: + if (ep->udev->speed == USB_SPEED_HIGH) + interval = 1 << (ep->desc->bInterval - 1); + else + interval = ep->desc->bInterval; + break; + } + interval *= (ep->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 DEVICE_ATTR(interval, S_IRUGO, show_ep_interval, NULL); + +static ssize_t show_ep_direction(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct ep_device *ep = to_ep_device(dev); + char *direction; + + if ((ep->desc->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) == + USB_ENDPOINT_XFER_CONTROL) + direction = "both"; + else if (ep->desc->bEndpointAddress & USB_DIR_IN) + direction = "in"; + else + direction = "out"; + return sprintf(buf, "%s\n", direction); +} +static DEVICE_ATTR(direction, S_IRUGO, show_ep_direction, NULL); + +static struct attribute *ep_dev_attrs[] = { + &dev_attr_bLength.attr, + &dev_attr_bEndpointAddress.attr, + &dev_attr_bmAttributes.attr, + &dev_attr_bInterval.attr, + &dev_attr_wMaxPacketSize.attr, + &dev_attr_interval.attr, + &dev_attr_type.attr, + &dev_attr_direction.attr, + NULL, +}; +static struct attribute_group ep_dev_attr_grp = { + .attrs = ep_dev_attrs, +}; + +static struct endpoint_class { + struct kref kref; + struct class *class; +} *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, + struct usb_host_endpoint *endpoint, + struct usb_device *udev) +{ + char name[8]; + struct ep_device *ep_dev; + int minor; + int retval; + + retval = init_endpoint_class(); + if (retval) + goto exit; + + ep_dev = kzalloc(sizeof(*ep_dev), GFP_KERNEL); + if (!ep_dev) { + retval = -ENOMEM; + goto exit; + } + + /* fun calculation to determine the minor of this endpoint */ + minor = (((udev->bus->busnum - 1) * 128) * 16) + (udev->devnum - 1); + + ep_dev->desc = &endpoint->desc; + ep_dev->udev = udev; + ep_dev->dev.devt = MKDEV(442, minor); // FIXME fake number... + ep_dev->dev.class = ep_class->class; + ep_dev->dev.parent = parent; + 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) +{ + + if (endpoint->ep_dev) { + char name[8]; + + 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(); +} + + |