![Bjørn Mork](/assets/img/avatar_default.png)
Matching on device and interface class with with unspecified subclass and protocol is sometimes useful. This is slightly different from USB_DEVICE_AND_INTERFACE_INFO which requires the full interface class/subclass/protocol triplet. Signed-off-by: Bjørn Mork <bjorn@mork.no> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
1811 lines
69 KiB
C
1811 lines
69 KiB
C
#ifndef __LINUX_USB_H
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#define __LINUX_USB_H
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#include <linux/mod_devicetable.h>
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#include <linux/usb/ch9.h>
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#define USB_MAJOR 180
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#define USB_DEVICE_MAJOR 189
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#ifdef __KERNEL__
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#include <linux/errno.h> /* for -ENODEV */
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#include <linux/delay.h> /* for mdelay() */
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#include <linux/interrupt.h> /* for in_interrupt() */
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#include <linux/list.h> /* for struct list_head */
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#include <linux/kref.h> /* for struct kref */
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#include <linux/device.h> /* for struct device */
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#include <linux/fs.h> /* for struct file_operations */
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#include <linux/completion.h> /* for struct completion */
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#include <linux/sched.h> /* for current && schedule_timeout */
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#include <linux/mutex.h> /* for struct mutex */
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#include <linux/pm_runtime.h> /* for runtime PM */
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struct usb_device;
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struct usb_driver;
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struct wusb_dev;
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/*-------------------------------------------------------------------------*/
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/*
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* Host-side wrappers for standard USB descriptors ... these are parsed
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* from the data provided by devices. Parsing turns them from a flat
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* sequence of descriptors into a hierarchy:
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*
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* - devices have one (usually) or more configs;
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* - configs have one (often) or more interfaces;
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* - interfaces have one (usually) or more settings;
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* - each interface setting has zero or (usually) more endpoints.
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* - a SuperSpeed endpoint has a companion descriptor
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*
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* And there might be other descriptors mixed in with those.
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*
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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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* @ss_ep_comp: SuperSpeed companion descriptor for this endpoint
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* @urb_list: urbs queued to this endpoint; maintained by usbcore
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* @hcpriv: for use by HCD; typically holds hardware dma queue head (QH)
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* with one or more transfer descriptors (TDs) per urb
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* @ep_dev: ep_device for sysfs info
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* @extra: descriptors following this endpoint in the configuration
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* @extralen: how many bytes of "extra" are valid
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* @enabled: URBs may be submitted to this endpoint
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*
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* USB requests are always queued to a given endpoint, identified by a
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* descriptor within an active interface in a given USB configuration.
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*/
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struct usb_host_endpoint {
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struct usb_endpoint_descriptor desc;
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struct usb_ss_ep_comp_descriptor ss_ep_comp;
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struct list_head urb_list;
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void *hcpriv;
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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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int enabled;
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};
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/* host-side wrapper for one interface setting's parsed descriptors */
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struct usb_host_interface {
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struct usb_interface_descriptor desc;
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int extralen;
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unsigned char *extra; /* Extra descriptors */
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/* array of desc.bNumEndpoint endpoints associated with this
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* interface setting. these will be in no particular order.
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*/
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struct usb_host_endpoint *endpoint;
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char *string; /* iInterface string, if present */
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};
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enum usb_interface_condition {
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USB_INTERFACE_UNBOUND = 0,
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USB_INTERFACE_BINDING,
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USB_INTERFACE_BOUND,
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USB_INTERFACE_UNBINDING,
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};
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/**
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* struct usb_interface - what usb device drivers talk to
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* @altsetting: array of interface structures, one for each alternate
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* setting that may be selected. Each one includes a set of
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* endpoint configurations. They will be in no particular order.
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* @cur_altsetting: the current altsetting.
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* @num_altsetting: number of altsettings defined.
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* @intf_assoc: interface association descriptor
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* @minor: the minor number assigned to this interface, if this
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* interface is bound to a driver that uses the USB major number.
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* If this interface does not use the USB major, this field should
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* be unused. The driver should set this value in the probe()
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* function of the driver, after it has been assigned a minor
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* number from the USB core by calling usb_register_dev().
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* @condition: binding state of the interface: not bound, binding
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* (in probe()), bound to a driver, or unbinding (in disconnect())
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* @sysfs_files_created: sysfs attributes exist
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* @ep_devs_created: endpoint child pseudo-devices exist
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* @unregistering: flag set when the interface is being unregistered
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* @needs_remote_wakeup: flag set when the driver requires remote-wakeup
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* capability during autosuspend.
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* @needs_altsetting0: flag set when a set-interface request for altsetting 0
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* has been deferred.
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* @needs_binding: flag set when the driver should be re-probed or unbound
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* following a reset or suspend operation it doesn't support.
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* @dev: driver model's view of this device
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* @usb_dev: if an interface is bound to the USB major, this will point
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* to the sysfs representation for that device.
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* @pm_usage_cnt: PM usage counter for this interface
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* @reset_ws: Used for scheduling resets from atomic context.
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* @reset_running: set to 1 if the interface is currently running a
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* queued reset so that usb_cancel_queued_reset() doesn't try to
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* remove from the workqueue when running inside the worker
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* thread. See __usb_queue_reset_device().
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* @resetting_device: USB core reset the device, so use alt setting 0 as
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* current; needs bandwidth alloc after reset.
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*
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* USB device drivers attach to interfaces on a physical device. Each
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* interface encapsulates a single high level function, such as feeding
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* an audio stream to a speaker or reporting a change in a volume control.
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* Many USB devices only have one interface. The protocol used to talk to
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* an interface's endpoints can be defined in a usb "class" specification,
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* or by a product's vendor. The (default) control endpoint is part of
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* every interface, but is never listed among the interface's descriptors.
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*
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* The driver that is bound to the interface can use standard driver model
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* calls such as dev_get_drvdata() on the dev member of this structure.
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*
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* Each interface may have alternate settings. The initial configuration
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* of a device sets altsetting 0, but the device driver can change
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* that setting using usb_set_interface(). Alternate settings are often
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* used to control the use of periodic endpoints, such as by having
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* different endpoints use different amounts of reserved USB bandwidth.
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* All standards-conformant USB devices that use isochronous endpoints
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* will use them in non-default settings.
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*
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* The USB specification says that alternate setting numbers must run from
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* 0 to one less than the total number of alternate settings. But some
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* devices manage to mess this up, and the structures aren't necessarily
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* stored in numerical order anyhow. Use usb_altnum_to_altsetting() to
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* look up an alternate setting in the altsetting array based on its number.
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*/
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struct usb_interface {
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/* array of alternate settings for this interface,
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* stored in no particular order */
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struct usb_host_interface *altsetting;
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struct usb_host_interface *cur_altsetting; /* the currently
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* active alternate setting */
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unsigned num_altsetting; /* number of alternate settings */
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/* If there is an interface association descriptor then it will list
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* the associated interfaces */
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struct usb_interface_assoc_descriptor *intf_assoc;
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int minor; /* minor number this interface is
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* bound to */
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enum usb_interface_condition condition; /* state of binding */
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unsigned sysfs_files_created:1; /* the sysfs attributes exist */
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unsigned ep_devs_created:1; /* endpoint "devices" exist */
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unsigned unregistering:1; /* unregistration is in progress */
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unsigned needs_remote_wakeup:1; /* driver requires remote wakeup */
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unsigned needs_altsetting0:1; /* switch to altsetting 0 is pending */
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unsigned needs_binding:1; /* needs delayed unbind/rebind */
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unsigned reset_running:1;
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unsigned resetting_device:1; /* true: bandwidth alloc after reset */
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struct device dev; /* interface specific device info */
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struct device *usb_dev;
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atomic_t pm_usage_cnt; /* usage counter for autosuspend */
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struct work_struct reset_ws; /* for resets in atomic context */
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};
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#define to_usb_interface(d) container_of(d, struct usb_interface, dev)
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static inline void *usb_get_intfdata(struct usb_interface *intf)
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{
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return dev_get_drvdata(&intf->dev);
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}
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static inline void usb_set_intfdata(struct usb_interface *intf, void *data)
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{
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dev_set_drvdata(&intf->dev, data);
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}
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struct usb_interface *usb_get_intf(struct usb_interface *intf);
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void usb_put_intf(struct usb_interface *intf);
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/* this maximum is arbitrary */
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#define USB_MAXINTERFACES 32
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#define USB_MAXIADS (USB_MAXINTERFACES/2)
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/**
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* struct usb_interface_cache - long-term representation of a device interface
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* @num_altsetting: number of altsettings defined.
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* @ref: reference counter.
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* @altsetting: variable-length array of interface structures, one for
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* each alternate setting that may be selected. Each one includes a
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* set of endpoint configurations. They will be in no particular order.
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*
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* These structures persist for the lifetime of a usb_device, unlike
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* struct usb_interface (which persists only as long as its configuration
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* is installed). The altsetting arrays can be accessed through these
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* structures at any time, permitting comparison of configurations and
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* providing support for the /proc/bus/usb/devices pseudo-file.
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*/
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struct usb_interface_cache {
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unsigned num_altsetting; /* number of alternate settings */
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struct kref ref; /* reference counter */
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/* variable-length array of alternate settings for this interface,
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* stored in no particular order */
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struct usb_host_interface altsetting[0];
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};
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#define ref_to_usb_interface_cache(r) \
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container_of(r, struct usb_interface_cache, ref)
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#define altsetting_to_usb_interface_cache(a) \
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container_of(a, struct usb_interface_cache, altsetting[0])
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/**
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* struct usb_host_config - representation of a device's configuration
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* @desc: the device's configuration descriptor.
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* @string: pointer to the cached version of the iConfiguration string, if
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* present for this configuration.
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* @intf_assoc: list of any interface association descriptors in this config
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* @interface: array of pointers to usb_interface structures, one for each
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* interface in the configuration. The number of interfaces is stored
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* in desc.bNumInterfaces. These pointers are valid only while the
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* the configuration is active.
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* @intf_cache: array of pointers to usb_interface_cache structures, one
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* for each interface in the configuration. These structures exist
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* for the entire life of the device.
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* @extra: pointer to buffer containing all extra descriptors associated
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* with this configuration (those preceding the first interface
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* descriptor).
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* @extralen: length of the extra descriptors buffer.
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*
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* USB devices may have multiple configurations, but only one can be active
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* at any time. Each encapsulates a different operational environment;
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* for example, a dual-speed device would have separate configurations for
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* full-speed and high-speed operation. The number of configurations
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* available is stored in the device descriptor as bNumConfigurations.
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*
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* A configuration can contain multiple interfaces. Each corresponds to
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* a different function of the USB device, and all are available whenever
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* the configuration is active. The USB standard says that interfaces
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* are supposed to be numbered from 0 to desc.bNumInterfaces-1, but a lot
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* of devices get this wrong. In addition, the interface array is not
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* guaranteed to be sorted in numerical order. Use usb_ifnum_to_if() to
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* look up an interface entry based on its number.
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*
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* Device drivers should not attempt to activate configurations. The choice
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* of which configuration to install is a policy decision based on such
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* considerations as available power, functionality provided, and the user's
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* desires (expressed through userspace tools). However, drivers can call
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* usb_reset_configuration() to reinitialize the current configuration and
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* all its interfaces.
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*/
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struct usb_host_config {
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struct usb_config_descriptor desc;
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char *string; /* iConfiguration string, if present */
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/* List of any Interface Association Descriptors in this
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* configuration. */
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struct usb_interface_assoc_descriptor *intf_assoc[USB_MAXIADS];
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/* the interfaces associated with this configuration,
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* stored in no particular order */
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struct usb_interface *interface[USB_MAXINTERFACES];
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/* Interface information available even when this is not the
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* active configuration */
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struct usb_interface_cache *intf_cache[USB_MAXINTERFACES];
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unsigned char *extra; /* Extra descriptors */
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int extralen;
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};
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/* USB2.0 and USB3.0 device BOS descriptor set */
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struct usb_host_bos {
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struct usb_bos_descriptor *desc;
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/* wireless cap descriptor is handled by wusb */
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struct usb_ext_cap_descriptor *ext_cap;
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struct usb_ss_cap_descriptor *ss_cap;
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struct usb_ss_container_id_descriptor *ss_id;
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};
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int __usb_get_extra_descriptor(char *buffer, unsigned size,
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unsigned char type, void **ptr);
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#define usb_get_extra_descriptor(ifpoint, type, ptr) \
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__usb_get_extra_descriptor((ifpoint)->extra, \
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(ifpoint)->extralen, \
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type, (void **)ptr)
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/* ----------------------------------------------------------------------- */
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/* USB device number allocation bitmap */
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struct usb_devmap {
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unsigned long devicemap[128 / (8*sizeof(unsigned long))];
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};
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/*
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* Allocated per bus (tree of devices) we have:
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*/
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struct usb_bus {
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struct device *controller; /* host/master side hardware */
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int busnum; /* Bus number (in order of reg) */
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const char *bus_name; /* stable id (PCI slot_name etc) */
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u8 uses_dma; /* Does the host controller use DMA? */
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u8 uses_pio_for_control; /*
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* Does the host controller use PIO
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* for control transfers?
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*/
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u8 otg_port; /* 0, or number of OTG/HNP port */
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unsigned is_b_host:1; /* true during some HNP roleswitches */
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unsigned b_hnp_enable:1; /* OTG: did A-Host enable HNP? */
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unsigned no_stop_on_short:1; /*
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* Quirk: some controllers don't stop
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* the ep queue on a short transfer
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* with the URB_SHORT_NOT_OK flag set.
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*/
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unsigned sg_tablesize; /* 0 or largest number of sg list entries */
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int devnum_next; /* Next open device number in
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* round-robin allocation */
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struct usb_devmap devmap; /* device address allocation map */
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struct usb_device *root_hub; /* Root hub */
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struct usb_bus *hs_companion; /* Companion EHCI bus, if any */
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struct list_head bus_list; /* list of busses */
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int bandwidth_allocated; /* on this bus: how much of the time
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* reserved for periodic (intr/iso)
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* requests is used, on average?
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* Units: microseconds/frame.
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* Limits: Full/low speed reserve 90%,
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* while high speed reserves 80%.
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*/
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int bandwidth_int_reqs; /* number of Interrupt requests */
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int bandwidth_isoc_reqs; /* number of Isoc. requests */
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#if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
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struct mon_bus *mon_bus; /* non-null when associated */
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int monitored; /* non-zero when monitored */
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#endif
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};
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/* ----------------------------------------------------------------------- */
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/* This is arbitrary.
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* From USB 2.0 spec Table 11-13, offset 7, a hub can
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* have up to 255 ports. The most yet reported is 10.
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*
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* Current Wireless USB host hardware (Intel i1480 for example) allows
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* up to 22 devices to connect. Upcoming hardware might raise that
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* limit. Because the arrays need to add a bit for hub status data, we
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* do 31, so plus one evens out to four bytes.
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*/
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#define USB_MAXCHILDREN (31)
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struct usb_tt;
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enum usb_device_removable {
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USB_DEVICE_REMOVABLE_UNKNOWN = 0,
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USB_DEVICE_REMOVABLE,
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USB_DEVICE_FIXED,
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};
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enum usb_port_connect_type {
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USB_PORT_CONNECT_TYPE_UNKNOWN = 0,
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USB_PORT_CONNECT_TYPE_HOT_PLUG,
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USB_PORT_CONNECT_TYPE_HARD_WIRED,
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USB_PORT_NOT_USED,
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};
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/*
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* USB 3.0 Link Power Management (LPM) parameters.
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*
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* PEL and SEL are USB 3.0 Link PM latencies for device-initiated LPM exit.
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* MEL is the USB 3.0 Link PM latency for host-initiated LPM exit.
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* All three are stored in nanoseconds.
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*/
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struct usb3_lpm_parameters {
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/*
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* Maximum exit latency (MEL) for the host to send a packet to the
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* device (either a Ping for isoc endpoints, or a data packet for
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* interrupt endpoints), the hubs to decode the packet, and for all hubs
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* in the path to transition the links to U0.
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*/
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unsigned int mel;
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/*
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* Maximum exit latency for a device-initiated LPM transition to bring
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* all links into U0. Abbreviated as "PEL" in section 9.4.12 of the USB
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* 3.0 spec, with no explanation of what "P" stands for. "Path"?
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*/
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unsigned int pel;
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/*
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* The System Exit Latency (SEL) includes PEL, and three other
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* latencies. After a device initiates a U0 transition, it will take
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* some time from when the device sends the ERDY to when it will finally
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* receive the data packet. Basically, SEL should be the worse-case
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* latency from when a device starts initiating a U0 transition to when
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* it will get data.
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*/
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unsigned int sel;
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/*
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* The idle timeout value that is currently programmed into the parent
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* hub for this device. When the timer counts to zero, the parent hub
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* will initiate an LPM transition to either U1 or U2.
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*/
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int timeout;
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};
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/**
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* struct usb_device - kernel's representation of a USB device
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* @devnum: device number; address on a USB bus
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* @devpath: device ID string for use in messages (e.g., /port/...)
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* @route: tree topology hex string for use with xHCI
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* @state: device state: configured, not attached, etc.
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* @speed: device speed: high/full/low (or error)
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* @tt: Transaction Translator info; used with low/full speed dev, highspeed hub
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* @ttport: device port on that tt hub
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* @toggle: one bit for each endpoint, with ([0] = IN, [1] = OUT) endpoints
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* @parent: our hub, unless we're the root
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* @bus: bus we're part of
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* @ep0: endpoint 0 data (default control pipe)
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* @dev: generic device interface
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* @descriptor: USB device descriptor
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* @bos: USB device BOS descriptor set
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* @config: all of the device's configs
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* @actconfig: the active configuration
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* @ep_in: array of IN endpoints
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* @ep_out: array of OUT endpoints
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* @rawdescriptors: raw descriptors for each config
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* @bus_mA: Current available from the bus
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* @portnum: parent port number (origin 1)
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* @level: number of USB hub ancestors
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* @can_submit: URBs may be submitted
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* @persist_enabled: USB_PERSIST enabled for this device
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* @have_langid: whether string_langid is valid
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* @authorized: policy has said we can use it;
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* (user space) policy determines if we authorize this device to be
|
|
* used or not. By default, wired USB devices are authorized.
|
|
* WUSB devices are not, until we authorize them from user space.
|
|
* FIXME -- complete doc
|
|
* @authenticated: Crypto authentication passed
|
|
* @wusb: device is Wireless USB
|
|
* @lpm_capable: device supports LPM
|
|
* @usb2_hw_lpm_capable: device can perform USB2 hardware LPM
|
|
* @usb2_hw_lpm_enabled: USB2 hardware LPM enabled
|
|
* @string_langid: language ID for strings
|
|
* @product: iProduct string, if present (static)
|
|
* @manufacturer: iManufacturer string, if present (static)
|
|
* @serial: iSerialNumber string, if present (static)
|
|
* @filelist: usbfs files that are open to this device
|
|
* @usb_classdev: USB class device that was created for usbfs device
|
|
* access from userspace
|
|
* @usbfs_dentry: usbfs dentry entry for the device
|
|
* @maxchild: number of ports if hub
|
|
* @quirks: quirks of the whole device
|
|
* @urbnum: number of URBs submitted for the whole device
|
|
* @active_duration: total time device is not suspended
|
|
* @connect_time: time device was first connected
|
|
* @do_remote_wakeup: remote wakeup should be enabled
|
|
* @reset_resume: needs reset instead of resume
|
|
* @port_is_suspended: the upstream port is suspended (L2 or U3)
|
|
* @wusb_dev: if this is a Wireless USB device, link to the WUSB
|
|
* specific data for the device.
|
|
* @slot_id: Slot ID assigned by xHCI
|
|
* @removable: Device can be physically removed from this port
|
|
* @u1_params: exit latencies for USB3 U1 LPM state, and hub-initiated timeout.
|
|
* @u2_params: exit latencies for USB3 U2 LPM state, and hub-initiated timeout.
|
|
* @lpm_disable_count: Ref count used by usb_disable_lpm() and usb_enable_lpm()
|
|
* to keep track of the number of functions that require USB 3.0 Link Power
|
|
* Management to be disabled for this usb_device. This count should only
|
|
* be manipulated by those functions, with the bandwidth_mutex is held.
|
|
*
|
|
* Notes:
|
|
* Usbcore drivers should not set usbdev->state directly. Instead use
|
|
* usb_set_device_state().
|
|
*/
|
|
struct usb_device {
|
|
int devnum;
|
|
char devpath[16];
|
|
u32 route;
|
|
enum usb_device_state state;
|
|
enum usb_device_speed speed;
|
|
|
|
struct usb_tt *tt;
|
|
int ttport;
|
|
|
|
unsigned int toggle[2];
|
|
|
|
struct usb_device *parent;
|
|
struct usb_bus *bus;
|
|
struct usb_host_endpoint ep0;
|
|
|
|
struct device dev;
|
|
|
|
struct usb_device_descriptor descriptor;
|
|
struct usb_host_bos *bos;
|
|
struct usb_host_config *config;
|
|
|
|
struct usb_host_config *actconfig;
|
|
struct usb_host_endpoint *ep_in[16];
|
|
struct usb_host_endpoint *ep_out[16];
|
|
|
|
char **rawdescriptors;
|
|
|
|
unsigned short bus_mA;
|
|
u8 portnum;
|
|
u8 level;
|
|
|
|
unsigned can_submit:1;
|
|
unsigned persist_enabled:1;
|
|
unsigned have_langid:1;
|
|
unsigned authorized:1;
|
|
unsigned authenticated:1;
|
|
unsigned wusb:1;
|
|
unsigned lpm_capable:1;
|
|
unsigned usb2_hw_lpm_capable:1;
|
|
unsigned usb2_hw_lpm_enabled:1;
|
|
unsigned usb3_lpm_enabled:1;
|
|
int string_langid;
|
|
|
|
/* static strings from the device */
|
|
char *product;
|
|
char *manufacturer;
|
|
char *serial;
|
|
|
|
struct list_head filelist;
|
|
|
|
int maxchild;
|
|
|
|
u32 quirks;
|
|
atomic_t urbnum;
|
|
|
|
unsigned long active_duration;
|
|
|
|
#ifdef CONFIG_PM
|
|
unsigned long connect_time;
|
|
|
|
unsigned do_remote_wakeup:1;
|
|
unsigned reset_resume:1;
|
|
unsigned port_is_suspended:1;
|
|
#endif
|
|
struct wusb_dev *wusb_dev;
|
|
int slot_id;
|
|
enum usb_device_removable removable;
|
|
struct usb3_lpm_parameters u1_params;
|
|
struct usb3_lpm_parameters u2_params;
|
|
unsigned lpm_disable_count;
|
|
};
|
|
#define to_usb_device(d) container_of(d, struct usb_device, dev)
|
|
|
|
static inline struct usb_device *interface_to_usbdev(struct usb_interface *intf)
|
|
{
|
|
return to_usb_device(intf->dev.parent);
|
|
}
|
|
|
|
extern struct usb_device *usb_get_dev(struct usb_device *dev);
|
|
extern void usb_put_dev(struct usb_device *dev);
|
|
extern struct usb_device *usb_hub_find_child(struct usb_device *hdev,
|
|
int port1);
|
|
|
|
/**
|
|
* usb_hub_for_each_child - iterate over all child devices on the hub
|
|
* @hdev: USB device belonging to the usb hub
|
|
* @port1: portnum associated with child device
|
|
* @child: child device pointer
|
|
*/
|
|
#define usb_hub_for_each_child(hdev, port1, child) \
|
|
for (port1 = 1, child = usb_hub_find_child(hdev, port1); \
|
|
port1 <= hdev->maxchild; \
|
|
child = usb_hub_find_child(hdev, ++port1)) \
|
|
if (!child) continue; else
|
|
|
|
/* USB device locking */
|
|
#define usb_lock_device(udev) device_lock(&(udev)->dev)
|
|
#define usb_unlock_device(udev) device_unlock(&(udev)->dev)
|
|
#define usb_trylock_device(udev) device_trylock(&(udev)->dev)
|
|
extern int usb_lock_device_for_reset(struct usb_device *udev,
|
|
const struct usb_interface *iface);
|
|
|
|
/* USB port reset for device reinitialization */
|
|
extern int usb_reset_device(struct usb_device *dev);
|
|
extern void usb_queue_reset_device(struct usb_interface *dev);
|
|
|
|
#ifdef CONFIG_ACPI
|
|
extern int usb_acpi_set_power_state(struct usb_device *hdev, int index,
|
|
bool enable);
|
|
extern bool usb_acpi_power_manageable(struct usb_device *hdev, int index);
|
|
#else
|
|
static inline int usb_acpi_set_power_state(struct usb_device *hdev, int index,
|
|
bool enable) { return 0; }
|
|
static inline bool usb_acpi_power_manageable(struct usb_device *hdev, int index)
|
|
{ return true; }
|
|
#endif
|
|
|
|
/* USB autosuspend and autoresume */
|
|
#ifdef CONFIG_USB_SUSPEND
|
|
extern void usb_enable_autosuspend(struct usb_device *udev);
|
|
extern void usb_disable_autosuspend(struct usb_device *udev);
|
|
|
|
extern int usb_autopm_get_interface(struct usb_interface *intf);
|
|
extern void usb_autopm_put_interface(struct usb_interface *intf);
|
|
extern int usb_autopm_get_interface_async(struct usb_interface *intf);
|
|
extern void usb_autopm_put_interface_async(struct usb_interface *intf);
|
|
extern void usb_autopm_get_interface_no_resume(struct usb_interface *intf);
|
|
extern void usb_autopm_put_interface_no_suspend(struct usb_interface *intf);
|
|
|
|
static inline void usb_mark_last_busy(struct usb_device *udev)
|
|
{
|
|
pm_runtime_mark_last_busy(&udev->dev);
|
|
}
|
|
|
|
#else
|
|
|
|
static inline int usb_enable_autosuspend(struct usb_device *udev)
|
|
{ return 0; }
|
|
static inline int usb_disable_autosuspend(struct usb_device *udev)
|
|
{ return 0; }
|
|
|
|
static inline int usb_autopm_get_interface(struct usb_interface *intf)
|
|
{ return 0; }
|
|
static inline int usb_autopm_get_interface_async(struct usb_interface *intf)
|
|
{ return 0; }
|
|
|
|
static inline void usb_autopm_put_interface(struct usb_interface *intf)
|
|
{ }
|
|
static inline void usb_autopm_put_interface_async(struct usb_interface *intf)
|
|
{ }
|
|
static inline void usb_autopm_get_interface_no_resume(
|
|
struct usb_interface *intf)
|
|
{ }
|
|
static inline void usb_autopm_put_interface_no_suspend(
|
|
struct usb_interface *intf)
|
|
{ }
|
|
static inline void usb_mark_last_busy(struct usb_device *udev)
|
|
{ }
|
|
#endif
|
|
|
|
extern int usb_disable_lpm(struct usb_device *udev);
|
|
extern void usb_enable_lpm(struct usb_device *udev);
|
|
/* Same as above, but these functions lock/unlock the bandwidth_mutex. */
|
|
extern int usb_unlocked_disable_lpm(struct usb_device *udev);
|
|
extern void usb_unlocked_enable_lpm(struct usb_device *udev);
|
|
|
|
extern int usb_disable_ltm(struct usb_device *udev);
|
|
extern void usb_enable_ltm(struct usb_device *udev);
|
|
|
|
static inline bool usb_device_supports_ltm(struct usb_device *udev)
|
|
{
|
|
if (udev->speed != USB_SPEED_SUPER || !udev->bos || !udev->bos->ss_cap)
|
|
return false;
|
|
return udev->bos->ss_cap->bmAttributes & USB_LTM_SUPPORT;
|
|
}
|
|
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/* for drivers using iso endpoints */
|
|
extern int usb_get_current_frame_number(struct usb_device *usb_dev);
|
|
|
|
/* Sets up a group of bulk endpoints to support multiple stream IDs. */
|
|
extern int usb_alloc_streams(struct usb_interface *interface,
|
|
struct usb_host_endpoint **eps, unsigned int num_eps,
|
|
unsigned int num_streams, gfp_t mem_flags);
|
|
|
|
/* Reverts a group of bulk endpoints back to not using stream IDs. */
|
|
extern void usb_free_streams(struct usb_interface *interface,
|
|
struct usb_host_endpoint **eps, unsigned int num_eps,
|
|
gfp_t mem_flags);
|
|
|
|
/* used these for multi-interface device registration */
|
|
extern int usb_driver_claim_interface(struct usb_driver *driver,
|
|
struct usb_interface *iface, void *priv);
|
|
|
|
/**
|
|
* usb_interface_claimed - returns true iff an interface is claimed
|
|
* @iface: the interface being checked
|
|
*
|
|
* Returns true (nonzero) iff the interface is claimed, else false (zero).
|
|
* Callers must own the driver model's usb bus readlock. So driver
|
|
* probe() entries don't need extra locking, but other call contexts
|
|
* may need to explicitly claim that lock.
|
|
*
|
|
*/
|
|
static inline int usb_interface_claimed(struct usb_interface *iface)
|
|
{
|
|
return (iface->dev.driver != NULL);
|
|
}
|
|
|
|
extern void usb_driver_release_interface(struct usb_driver *driver,
|
|
struct usb_interface *iface);
|
|
const struct usb_device_id *usb_match_id(struct usb_interface *interface,
|
|
const struct usb_device_id *id);
|
|
extern int usb_match_one_id(struct usb_interface *interface,
|
|
const struct usb_device_id *id);
|
|
|
|
extern struct usb_interface *usb_find_interface(struct usb_driver *drv,
|
|
int minor);
|
|
extern struct usb_interface *usb_ifnum_to_if(const struct usb_device *dev,
|
|
unsigned ifnum);
|
|
extern struct usb_host_interface *usb_altnum_to_altsetting(
|
|
const struct usb_interface *intf, unsigned int altnum);
|
|
extern struct usb_host_interface *usb_find_alt_setting(
|
|
struct usb_host_config *config,
|
|
unsigned int iface_num,
|
|
unsigned int alt_num);
|
|
|
|
|
|
/**
|
|
* usb_make_path - returns stable device path in the usb tree
|
|
* @dev: the device whose path is being constructed
|
|
* @buf: where to put the string
|
|
* @size: how big is "buf"?
|
|
*
|
|
* Returns length of the string (> 0) or negative if size was too small.
|
|
*
|
|
* This identifier is intended to be "stable", reflecting physical paths in
|
|
* hardware such as physical bus addresses for host controllers or ports on
|
|
* USB hubs. That makes it stay the same until systems are physically
|
|
* reconfigured, by re-cabling a tree of USB devices or by moving USB host
|
|
* controllers. Adding and removing devices, including virtual root hubs
|
|
* in host controller driver modules, does not change these path identifiers;
|
|
* neither does rebooting or re-enumerating. These are more useful identifiers
|
|
* than changeable ("unstable") ones like bus numbers or device addresses.
|
|
*
|
|
* With a partial exception for devices connected to USB 2.0 root hubs, these
|
|
* identifiers are also predictable. So long as the device tree isn't changed,
|
|
* plugging any USB device into a given hub port always gives it the same path.
|
|
* Because of the use of "companion" controllers, devices connected to ports on
|
|
* USB 2.0 root hubs (EHCI host controllers) will get one path ID if they are
|
|
* high speed, and a different one if they are full or low speed.
|
|
*/
|
|
static inline int usb_make_path(struct usb_device *dev, char *buf, size_t size)
|
|
{
|
|
int actual;
|
|
actual = snprintf(buf, size, "usb-%s-%s", dev->bus->bus_name,
|
|
dev->devpath);
|
|
return (actual >= (int)size) ? -1 : actual;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
#define USB_DEVICE_ID_MATCH_DEVICE \
|
|
(USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT)
|
|
#define USB_DEVICE_ID_MATCH_DEV_RANGE \
|
|
(USB_DEVICE_ID_MATCH_DEV_LO | USB_DEVICE_ID_MATCH_DEV_HI)
|
|
#define USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION \
|
|
(USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_DEV_RANGE)
|
|
#define USB_DEVICE_ID_MATCH_DEV_INFO \
|
|
(USB_DEVICE_ID_MATCH_DEV_CLASS | \
|
|
USB_DEVICE_ID_MATCH_DEV_SUBCLASS | \
|
|
USB_DEVICE_ID_MATCH_DEV_PROTOCOL)
|
|
#define USB_DEVICE_ID_MATCH_INT_INFO \
|
|
(USB_DEVICE_ID_MATCH_INT_CLASS | \
|
|
USB_DEVICE_ID_MATCH_INT_SUBCLASS | \
|
|
USB_DEVICE_ID_MATCH_INT_PROTOCOL)
|
|
|
|
/**
|
|
* USB_DEVICE - macro used to describe a specific usb device
|
|
* @vend: the 16 bit USB Vendor ID
|
|
* @prod: the 16 bit USB Product ID
|
|
*
|
|
* This macro is used to create a struct usb_device_id that matches a
|
|
* specific device.
|
|
*/
|
|
#define USB_DEVICE(vend, prod) \
|
|
.match_flags = USB_DEVICE_ID_MATCH_DEVICE, \
|
|
.idVendor = (vend), \
|
|
.idProduct = (prod)
|
|
/**
|
|
* USB_DEVICE_VER - describe a specific usb device with a version range
|
|
* @vend: the 16 bit USB Vendor ID
|
|
* @prod: the 16 bit USB Product ID
|
|
* @lo: the bcdDevice_lo value
|
|
* @hi: the bcdDevice_hi value
|
|
*
|
|
* This macro is used to create a struct usb_device_id that matches a
|
|
* specific device, with a version range.
|
|
*/
|
|
#define USB_DEVICE_VER(vend, prod, lo, hi) \
|
|
.match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION, \
|
|
.idVendor = (vend), \
|
|
.idProduct = (prod), \
|
|
.bcdDevice_lo = (lo), \
|
|
.bcdDevice_hi = (hi)
|
|
|
|
/**
|
|
* USB_DEVICE_INTERFACE_CLASS - describe a usb device with a specific interface class
|
|
* @vend: the 16 bit USB Vendor ID
|
|
* @prod: the 16 bit USB Product ID
|
|
* @cl: bInterfaceClass value
|
|
*
|
|
* This macro is used to create a struct usb_device_id that matches a
|
|
* specific interface class of devices.
|
|
*/
|
|
#define USB_DEVICE_INTERFACE_CLASS(vend, prod, cl) \
|
|
.match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
|
|
USB_DEVICE_ID_MATCH_INT_CLASS, \
|
|
.idVendor = (vend), \
|
|
.idProduct = (prod), \
|
|
.bInterfaceClass = (cl)
|
|
|
|
/**
|
|
* USB_DEVICE_INTERFACE_PROTOCOL - describe a usb device with a specific interface protocol
|
|
* @vend: the 16 bit USB Vendor ID
|
|
* @prod: the 16 bit USB Product ID
|
|
* @pr: bInterfaceProtocol value
|
|
*
|
|
* This macro is used to create a struct usb_device_id that matches a
|
|
* specific interface protocol of devices.
|
|
*/
|
|
#define USB_DEVICE_INTERFACE_PROTOCOL(vend, prod, pr) \
|
|
.match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
|
|
USB_DEVICE_ID_MATCH_INT_PROTOCOL, \
|
|
.idVendor = (vend), \
|
|
.idProduct = (prod), \
|
|
.bInterfaceProtocol = (pr)
|
|
|
|
/**
|
|
* USB_DEVICE_INTERFACE_NUMBER - describe a usb device with a specific interface number
|
|
* @vend: the 16 bit USB Vendor ID
|
|
* @prod: the 16 bit USB Product ID
|
|
* @num: bInterfaceNumber value
|
|
*
|
|
* This macro is used to create a struct usb_device_id that matches a
|
|
* specific interface number of devices.
|
|
*/
|
|
#define USB_DEVICE_INTERFACE_NUMBER(vend, prod, num) \
|
|
.match_flags = USB_DEVICE_ID_MATCH_DEVICE | \
|
|
USB_DEVICE_ID_MATCH_INT_NUMBER, \
|
|
.idVendor = (vend), \
|
|
.idProduct = (prod), \
|
|
.bInterfaceNumber = (num)
|
|
|
|
/**
|
|
* USB_DEVICE_INFO - macro used to describe a class of usb devices
|
|
* @cl: bDeviceClass value
|
|
* @sc: bDeviceSubClass value
|
|
* @pr: bDeviceProtocol value
|
|
*
|
|
* This macro is used to create a struct usb_device_id that matches a
|
|
* specific class of devices.
|
|
*/
|
|
#define USB_DEVICE_INFO(cl, sc, pr) \
|
|
.match_flags = USB_DEVICE_ID_MATCH_DEV_INFO, \
|
|
.bDeviceClass = (cl), \
|
|
.bDeviceSubClass = (sc), \
|
|
.bDeviceProtocol = (pr)
|
|
|
|
/**
|
|
* USB_INTERFACE_INFO - macro used to describe a class of usb interfaces
|
|
* @cl: bInterfaceClass value
|
|
* @sc: bInterfaceSubClass value
|
|
* @pr: bInterfaceProtocol value
|
|
*
|
|
* This macro is used to create a struct usb_device_id that matches a
|
|
* specific class of interfaces.
|
|
*/
|
|
#define USB_INTERFACE_INFO(cl, sc, pr) \
|
|
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO, \
|
|
.bInterfaceClass = (cl), \
|
|
.bInterfaceSubClass = (sc), \
|
|
.bInterfaceProtocol = (pr)
|
|
|
|
/**
|
|
* USB_DEVICE_AND_INTERFACE_INFO - describe a specific usb device with a class of usb interfaces
|
|
* @vend: the 16 bit USB Vendor ID
|
|
* @prod: the 16 bit USB Product ID
|
|
* @cl: bInterfaceClass value
|
|
* @sc: bInterfaceSubClass value
|
|
* @pr: bInterfaceProtocol value
|
|
*
|
|
* This macro is used to create a struct usb_device_id that matches a
|
|
* specific device with a specific class of interfaces.
|
|
*
|
|
* This is especially useful when explicitly matching devices that have
|
|
* vendor specific bDeviceClass values, but standards-compliant interfaces.
|
|
*/
|
|
#define USB_DEVICE_AND_INTERFACE_INFO(vend, prod, cl, sc, pr) \
|
|
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO \
|
|
| USB_DEVICE_ID_MATCH_DEVICE, \
|
|
.idVendor = (vend), \
|
|
.idProduct = (prod), \
|
|
.bInterfaceClass = (cl), \
|
|
.bInterfaceSubClass = (sc), \
|
|
.bInterfaceProtocol = (pr)
|
|
|
|
/**
|
|
* USB_VENDOR_AND_INTERFACE_INFO - describe a specific usb vendor with a class of usb interfaces
|
|
* @vend: the 16 bit USB Vendor ID
|
|
* @cl: bInterfaceClass value
|
|
* @sc: bInterfaceSubClass value
|
|
* @pr: bInterfaceProtocol value
|
|
*
|
|
* This macro is used to create a struct usb_device_id that matches a
|
|
* specific vendor with a specific class of interfaces.
|
|
*
|
|
* This is especially useful when explicitly matching devices that have
|
|
* vendor specific bDeviceClass values, but standards-compliant interfaces.
|
|
*/
|
|
#define USB_VENDOR_AND_INTERFACE_INFO(vend, cl, sc, pr) \
|
|
.match_flags = USB_DEVICE_ID_MATCH_INT_INFO \
|
|
| USB_DEVICE_ID_MATCH_VENDOR, \
|
|
.idVendor = (vend), \
|
|
.bInterfaceClass = (cl), \
|
|
.bInterfaceSubClass = (sc), \
|
|
.bInterfaceProtocol = (pr)
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
/* Stuff for dynamic usb ids */
|
|
struct usb_dynids {
|
|
spinlock_t lock;
|
|
struct list_head list;
|
|
};
|
|
|
|
struct usb_dynid {
|
|
struct list_head node;
|
|
struct usb_device_id id;
|
|
};
|
|
|
|
extern ssize_t usb_store_new_id(struct usb_dynids *dynids,
|
|
struct device_driver *driver,
|
|
const char *buf, size_t count);
|
|
|
|
extern ssize_t usb_show_dynids(struct usb_dynids *dynids, char *buf);
|
|
|
|
/**
|
|
* struct usbdrv_wrap - wrapper for driver-model structure
|
|
* @driver: The driver-model core driver structure.
|
|
* @for_devices: Non-zero for device drivers, 0 for interface drivers.
|
|
*/
|
|
struct usbdrv_wrap {
|
|
struct device_driver driver;
|
|
int for_devices;
|
|
};
|
|
|
|
/**
|
|
* struct usb_driver - identifies USB interface driver to usbcore
|
|
* @name: The driver name should be unique among USB drivers,
|
|
* and should normally be the same as the module name.
|
|
* @probe: Called to see if the driver is willing to manage a particular
|
|
* interface on a device. If it is, probe returns zero and uses
|
|
* usb_set_intfdata() to associate driver-specific data with the
|
|
* interface. It may also use usb_set_interface() to specify the
|
|
* appropriate altsetting. If unwilling to manage the interface,
|
|
* return -ENODEV, if genuine IO errors occurred, an appropriate
|
|
* negative errno value.
|
|
* @disconnect: Called when the interface is no longer accessible, usually
|
|
* because its device has been (or is being) disconnected or the
|
|
* driver module is being unloaded.
|
|
* @unlocked_ioctl: Used for drivers that want to talk to userspace through
|
|
* the "usbfs" filesystem. This lets devices provide ways to
|
|
* expose information to user space regardless of where they
|
|
* do (or don't) show up otherwise in the filesystem.
|
|
* @suspend: Called when the device is going to be suspended by the system.
|
|
* @resume: Called when the device is being resumed by the system.
|
|
* @reset_resume: Called when the suspended device has been reset instead
|
|
* of being resumed.
|
|
* @pre_reset: Called by usb_reset_device() when the device is about to be
|
|
* reset. This routine must not return until the driver has no active
|
|
* URBs for the device, and no more URBs may be submitted until the
|
|
* post_reset method is called.
|
|
* @post_reset: Called by usb_reset_device() after the device
|
|
* has been reset
|
|
* @id_table: USB drivers use ID table to support hotplugging.
|
|
* Export this with MODULE_DEVICE_TABLE(usb,...). This must be set
|
|
* or your driver's probe function will never get called.
|
|
* @dynids: used internally to hold the list of dynamically added device
|
|
* ids for this driver.
|
|
* @drvwrap: Driver-model core structure wrapper.
|
|
* @no_dynamic_id: if set to 1, the USB core will not allow dynamic ids to be
|
|
* added to this driver by preventing the sysfs file from being created.
|
|
* @supports_autosuspend: if set to 0, the USB core will not allow autosuspend
|
|
* for interfaces bound to this driver.
|
|
* @soft_unbind: if set to 1, the USB core will not kill URBs and disable
|
|
* endpoints before calling the driver's disconnect method.
|
|
* @disable_hub_initiated_lpm: if set to 0, the USB core will not allow hubs
|
|
* to initiate lower power link state transitions when an idle timeout
|
|
* occurs. Device-initiated USB 3.0 link PM will still be allowed.
|
|
*
|
|
* USB interface drivers must provide a name, probe() and disconnect()
|
|
* methods, and an id_table. Other driver fields are optional.
|
|
*
|
|
* The id_table is used in hotplugging. It holds a set of descriptors,
|
|
* and specialized data may be associated with each entry. That table
|
|
* is used by both user and kernel mode hotplugging support.
|
|
*
|
|
* The probe() and disconnect() methods are called in a context where
|
|
* they can sleep, but they should avoid abusing the privilege. Most
|
|
* work to connect to a device should be done when the device is opened,
|
|
* and undone at the last close. The disconnect code needs to address
|
|
* concurrency issues with respect to open() and close() methods, as
|
|
* well as forcing all pending I/O requests to complete (by unlinking
|
|
* them as necessary, and blocking until the unlinks complete).
|
|
*/
|
|
struct usb_driver {
|
|
const char *name;
|
|
|
|
int (*probe) (struct usb_interface *intf,
|
|
const struct usb_device_id *id);
|
|
|
|
void (*disconnect) (struct usb_interface *intf);
|
|
|
|
int (*unlocked_ioctl) (struct usb_interface *intf, unsigned int code,
|
|
void *buf);
|
|
|
|
int (*suspend) (struct usb_interface *intf, pm_message_t message);
|
|
int (*resume) (struct usb_interface *intf);
|
|
int (*reset_resume)(struct usb_interface *intf);
|
|
|
|
int (*pre_reset)(struct usb_interface *intf);
|
|
int (*post_reset)(struct usb_interface *intf);
|
|
|
|
const struct usb_device_id *id_table;
|
|
|
|
struct usb_dynids dynids;
|
|
struct usbdrv_wrap drvwrap;
|
|
unsigned int no_dynamic_id:1;
|
|
unsigned int supports_autosuspend:1;
|
|
unsigned int disable_hub_initiated_lpm:1;
|
|
unsigned int soft_unbind:1;
|
|
};
|
|
#define to_usb_driver(d) container_of(d, struct usb_driver, drvwrap.driver)
|
|
|
|
/**
|
|
* struct usb_device_driver - identifies USB device driver to usbcore
|
|
* @name: The driver name should be unique among USB drivers,
|
|
* and should normally be the same as the module name.
|
|
* @probe: Called to see if the driver is willing to manage a particular
|
|
* device. If it is, probe returns zero and uses dev_set_drvdata()
|
|
* to associate driver-specific data with the device. If unwilling
|
|
* to manage the device, return a negative errno value.
|
|
* @disconnect: Called when the device is no longer accessible, usually
|
|
* because it has been (or is being) disconnected or the driver's
|
|
* module is being unloaded.
|
|
* @suspend: Called when the device is going to be suspended by the system.
|
|
* @resume: Called when the device is being resumed by the system.
|
|
* @drvwrap: Driver-model core structure wrapper.
|
|
* @supports_autosuspend: if set to 0, the USB core will not allow autosuspend
|
|
* for devices bound to this driver.
|
|
*
|
|
* USB drivers must provide all the fields listed above except drvwrap.
|
|
*/
|
|
struct usb_device_driver {
|
|
const char *name;
|
|
|
|
int (*probe) (struct usb_device *udev);
|
|
void (*disconnect) (struct usb_device *udev);
|
|
|
|
int (*suspend) (struct usb_device *udev, pm_message_t message);
|
|
int (*resume) (struct usb_device *udev, pm_message_t message);
|
|
struct usbdrv_wrap drvwrap;
|
|
unsigned int supports_autosuspend:1;
|
|
};
|
|
#define to_usb_device_driver(d) container_of(d, struct usb_device_driver, \
|
|
drvwrap.driver)
|
|
|
|
extern struct bus_type usb_bus_type;
|
|
|
|
/**
|
|
* struct usb_class_driver - identifies a USB driver that wants to use the USB major number
|
|
* @name: the usb class device name for this driver. Will show up in sysfs.
|
|
* @devnode: Callback to provide a naming hint for a possible
|
|
* device node to create.
|
|
* @fops: pointer to the struct file_operations of this driver.
|
|
* @minor_base: the start of the minor range for this driver.
|
|
*
|
|
* This structure is used for the usb_register_dev() and
|
|
* usb_unregister_dev() functions, to consolidate a number of the
|
|
* parameters used for them.
|
|
*/
|
|
struct usb_class_driver {
|
|
char *name;
|
|
char *(*devnode)(struct device *dev, umode_t *mode);
|
|
const struct file_operations *fops;
|
|
int minor_base;
|
|
};
|
|
|
|
/*
|
|
* use these in module_init()/module_exit()
|
|
* and don't forget MODULE_DEVICE_TABLE(usb, ...)
|
|
*/
|
|
extern int usb_register_driver(struct usb_driver *, struct module *,
|
|
const char *);
|
|
|
|
/* use a define to avoid include chaining to get THIS_MODULE & friends */
|
|
#define usb_register(driver) \
|
|
usb_register_driver(driver, THIS_MODULE, KBUILD_MODNAME)
|
|
|
|
extern void usb_deregister(struct usb_driver *);
|
|
|
|
/**
|
|
* module_usb_driver() - Helper macro for registering a USB driver
|
|
* @__usb_driver: usb_driver struct
|
|
*
|
|
* Helper macro for USB drivers which do not do anything special in module
|
|
* init/exit. This eliminates a lot of boilerplate. Each module may only
|
|
* use this macro once, and calling it replaces module_init() and module_exit()
|
|
*/
|
|
#define module_usb_driver(__usb_driver) \
|
|
module_driver(__usb_driver, usb_register, \
|
|
usb_deregister)
|
|
|
|
extern int usb_register_device_driver(struct usb_device_driver *,
|
|
struct module *);
|
|
extern void usb_deregister_device_driver(struct usb_device_driver *);
|
|
|
|
extern int usb_register_dev(struct usb_interface *intf,
|
|
struct usb_class_driver *class_driver);
|
|
extern void usb_deregister_dev(struct usb_interface *intf,
|
|
struct usb_class_driver *class_driver);
|
|
|
|
extern int usb_disabled(void);
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* URB support, for asynchronous request completions
|
|
*/
|
|
|
|
/*
|
|
* urb->transfer_flags:
|
|
*
|
|
* Note: URB_DIR_IN/OUT is automatically set in usb_submit_urb().
|
|
*/
|
|
#define URB_SHORT_NOT_OK 0x0001 /* report short reads as errors */
|
|
#define URB_ISO_ASAP 0x0002 /* iso-only; use the first unexpired
|
|
* slot in the schedule */
|
|
#define URB_NO_TRANSFER_DMA_MAP 0x0004 /* urb->transfer_dma valid on submit */
|
|
#define URB_NO_FSBR 0x0020 /* UHCI-specific */
|
|
#define URB_ZERO_PACKET 0x0040 /* Finish bulk OUT with short packet */
|
|
#define URB_NO_INTERRUPT 0x0080 /* HINT: no non-error interrupt
|
|
* needed */
|
|
#define URB_FREE_BUFFER 0x0100 /* Free transfer buffer with the URB */
|
|
|
|
/* The following flags are used internally by usbcore and HCDs */
|
|
#define URB_DIR_IN 0x0200 /* Transfer from device to host */
|
|
#define URB_DIR_OUT 0
|
|
#define URB_DIR_MASK URB_DIR_IN
|
|
|
|
#define URB_DMA_MAP_SINGLE 0x00010000 /* Non-scatter-gather mapping */
|
|
#define URB_DMA_MAP_PAGE 0x00020000 /* HCD-unsupported S-G */
|
|
#define URB_DMA_MAP_SG 0x00040000 /* HCD-supported S-G */
|
|
#define URB_MAP_LOCAL 0x00080000 /* HCD-local-memory mapping */
|
|
#define URB_SETUP_MAP_SINGLE 0x00100000 /* Setup packet DMA mapped */
|
|
#define URB_SETUP_MAP_LOCAL 0x00200000 /* HCD-local setup packet */
|
|
#define URB_DMA_SG_COMBINED 0x00400000 /* S-G entries were combined */
|
|
#define URB_ALIGNED_TEMP_BUFFER 0x00800000 /* Temp buffer was alloc'd */
|
|
|
|
struct usb_iso_packet_descriptor {
|
|
unsigned int offset;
|
|
unsigned int length; /* expected length */
|
|
unsigned int actual_length;
|
|
int status;
|
|
};
|
|
|
|
struct urb;
|
|
|
|
struct usb_anchor {
|
|
struct list_head urb_list;
|
|
wait_queue_head_t wait;
|
|
spinlock_t lock;
|
|
unsigned int poisoned:1;
|
|
};
|
|
|
|
static inline void init_usb_anchor(struct usb_anchor *anchor)
|
|
{
|
|
INIT_LIST_HEAD(&anchor->urb_list);
|
|
init_waitqueue_head(&anchor->wait);
|
|
spin_lock_init(&anchor->lock);
|
|
}
|
|
|
|
typedef void (*usb_complete_t)(struct urb *);
|
|
|
|
/**
|
|
* struct urb - USB Request Block
|
|
* @urb_list: For use by current owner of the URB.
|
|
* @anchor_list: membership in the list of an anchor
|
|
* @anchor: to anchor URBs to a common mooring
|
|
* @ep: Points to the endpoint's data structure. Will eventually
|
|
* replace @pipe.
|
|
* @pipe: Holds endpoint number, direction, type, and more.
|
|
* Create these values with the eight macros available;
|
|
* usb_{snd,rcv}TYPEpipe(dev,endpoint), where the TYPE is "ctrl"
|
|
* (control), "bulk", "int" (interrupt), or "iso" (isochronous).
|
|
* For example usb_sndbulkpipe() or usb_rcvintpipe(). Endpoint
|
|
* numbers range from zero to fifteen. Note that "in" endpoint two
|
|
* is a different endpoint (and pipe) from "out" endpoint two.
|
|
* The current configuration controls the existence, type, and
|
|
* maximum packet size of any given endpoint.
|
|
* @stream_id: the endpoint's stream ID for bulk streams
|
|
* @dev: Identifies the USB device to perform the request.
|
|
* @status: This is read in non-iso completion functions to get the
|
|
* status of the particular request. ISO requests only use it
|
|
* to tell whether the URB was unlinked; detailed status for
|
|
* each frame is in the fields of the iso_frame-desc.
|
|
* @transfer_flags: A variety of flags may be used to affect how URB
|
|
* submission, unlinking, or operation are handled. Different
|
|
* kinds of URB can use different flags.
|
|
* @transfer_buffer: This identifies the buffer to (or from) which the I/O
|
|
* request will be performed unless URB_NO_TRANSFER_DMA_MAP is set
|
|
* (however, do not leave garbage in transfer_buffer even then).
|
|
* This buffer must be suitable for DMA; allocate it with
|
|
* kmalloc() or equivalent. For transfers to "in" endpoints, contents
|
|
* of this buffer will be modified. This buffer is used for the data
|
|
* stage of control transfers.
|
|
* @transfer_dma: When transfer_flags includes URB_NO_TRANSFER_DMA_MAP,
|
|
* the device driver is saying that it provided this DMA address,
|
|
* which the host controller driver should use in preference to the
|
|
* transfer_buffer.
|
|
* @sg: scatter gather buffer list
|
|
* @num_mapped_sgs: (internal) number of mapped sg entries
|
|
* @num_sgs: number of entries in the sg list
|
|
* @transfer_buffer_length: How big is transfer_buffer. The transfer may
|
|
* be broken up into chunks according to the current maximum packet
|
|
* size for the endpoint, which is a function of the configuration
|
|
* and is encoded in the pipe. When the length is zero, neither
|
|
* transfer_buffer nor transfer_dma is used.
|
|
* @actual_length: This is read in non-iso completion functions, and
|
|
* it tells how many bytes (out of transfer_buffer_length) were
|
|
* transferred. It will normally be the same as requested, unless
|
|
* either an error was reported or a short read was performed.
|
|
* The URB_SHORT_NOT_OK transfer flag may be used to make such
|
|
* short reads be reported as errors.
|
|
* @setup_packet: Only used for control transfers, this points to eight bytes
|
|
* of setup data. Control transfers always start by sending this data
|
|
* to the device. Then transfer_buffer is read or written, if needed.
|
|
* @setup_dma: DMA pointer for the setup packet. The caller must not use
|
|
* this field; setup_packet must point to a valid buffer.
|
|
* @start_frame: Returns the initial frame for isochronous transfers.
|
|
* @number_of_packets: Lists the number of ISO transfer buffers.
|
|
* @interval: Specifies the polling interval for interrupt or isochronous
|
|
* transfers. The units are frames (milliseconds) for full and low
|
|
* speed devices, and microframes (1/8 millisecond) for highspeed
|
|
* and SuperSpeed devices.
|
|
* @error_count: Returns the number of ISO transfers that reported errors.
|
|
* @context: For use in completion functions. This normally points to
|
|
* request-specific driver context.
|
|
* @complete: Completion handler. This URB is passed as the parameter to the
|
|
* completion function. The completion function may then do what
|
|
* it likes with the URB, including resubmitting or freeing it.
|
|
* @iso_frame_desc: Used to provide arrays of ISO transfer buffers and to
|
|
* collect the transfer status for each buffer.
|
|
*
|
|
* This structure identifies USB transfer requests. URBs must be allocated by
|
|
* calling usb_alloc_urb() and freed with a call to usb_free_urb().
|
|
* Initialization may be done using various usb_fill_*_urb() functions. URBs
|
|
* are submitted using usb_submit_urb(), and pending requests may be canceled
|
|
* using usb_unlink_urb() or usb_kill_urb().
|
|
*
|
|
* Data Transfer Buffers:
|
|
*
|
|
* Normally drivers provide I/O buffers allocated with kmalloc() or otherwise
|
|
* taken from the general page pool. That is provided by transfer_buffer
|
|
* (control requests also use setup_packet), and host controller drivers
|
|
* perform a dma mapping (and unmapping) for each buffer transferred. Those
|
|
* mapping operations can be expensive on some platforms (perhaps using a dma
|
|
* bounce buffer or talking to an IOMMU),
|
|
* although they're cheap on commodity x86 and ppc hardware.
|
|
*
|
|
* Alternatively, drivers may pass the URB_NO_TRANSFER_DMA_MAP transfer flag,
|
|
* which tells the host controller driver that no such mapping is needed for
|
|
* the transfer_buffer since
|
|
* the device driver is DMA-aware. For example, a device driver might
|
|
* allocate a DMA buffer with usb_alloc_coherent() or call usb_buffer_map().
|
|
* When this transfer flag is provided, host controller drivers will
|
|
* attempt to use the dma address found in the transfer_dma
|
|
* field rather than determining a dma address themselves.
|
|
*
|
|
* Note that transfer_buffer must still be set if the controller
|
|
* does not support DMA (as indicated by bus.uses_dma) and when talking
|
|
* to root hub. If you have to trasfer between highmem zone and the device
|
|
* on such controller, create a bounce buffer or bail out with an error.
|
|
* If transfer_buffer cannot be set (is in highmem) and the controller is DMA
|
|
* capable, assign NULL to it, so that usbmon knows not to use the value.
|
|
* The setup_packet must always be set, so it cannot be located in highmem.
|
|
*
|
|
* Initialization:
|
|
*
|
|
* All URBs submitted must initialize the dev, pipe, transfer_flags (may be
|
|
* zero), and complete fields. All URBs must also initialize
|
|
* transfer_buffer and transfer_buffer_length. They may provide the
|
|
* URB_SHORT_NOT_OK transfer flag, indicating that short reads are
|
|
* to be treated as errors; that flag is invalid for write requests.
|
|
*
|
|
* Bulk URBs may
|
|
* use the URB_ZERO_PACKET transfer flag, indicating that bulk OUT transfers
|
|
* should always terminate with a short packet, even if it means adding an
|
|
* extra zero length packet.
|
|
*
|
|
* Control URBs must provide a valid pointer in the setup_packet field.
|
|
* Unlike the transfer_buffer, the setup_packet may not be mapped for DMA
|
|
* beforehand.
|
|
*
|
|
* Interrupt URBs must provide an interval, saying how often (in milliseconds
|
|
* or, for highspeed devices, 125 microsecond units)
|
|
* to poll for transfers. After the URB has been submitted, the interval
|
|
* field reflects how the transfer was actually scheduled.
|
|
* The polling interval may be more frequent than requested.
|
|
* For example, some controllers have a maximum interval of 32 milliseconds,
|
|
* while others support intervals of up to 1024 milliseconds.
|
|
* Isochronous URBs also have transfer intervals. (Note that for isochronous
|
|
* endpoints, as well as high speed interrupt endpoints, the encoding of
|
|
* the transfer interval in the endpoint descriptor is logarithmic.
|
|
* Device drivers must convert that value to linear units themselves.)
|
|
*
|
|
* If an isochronous endpoint queue isn't already running, the host
|
|
* controller will schedule a new URB to start as soon as bandwidth
|
|
* utilization allows. If the queue is running then a new URB will be
|
|
* scheduled to start in the first transfer slot following the end of the
|
|
* preceding URB, if that slot has not already expired. If the slot has
|
|
* expired (which can happen when IRQ delivery is delayed for a long time),
|
|
* the scheduling behavior depends on the URB_ISO_ASAP flag. If the flag
|
|
* is clear then the URB will be scheduled to start in the expired slot,
|
|
* implying that some of its packets will not be transferred; if the flag
|
|
* is set then the URB will be scheduled in the first unexpired slot,
|
|
* breaking the queue's synchronization. Upon URB completion, the
|
|
* start_frame field will be set to the (micro)frame number in which the
|
|
* transfer was scheduled. Ranges for frame counter values are HC-specific
|
|
* and can go from as low as 256 to as high as 65536 frames.
|
|
*
|
|
* Isochronous URBs have a different data transfer model, in part because
|
|
* the quality of service is only "best effort". Callers provide specially
|
|
* allocated URBs, with number_of_packets worth of iso_frame_desc structures
|
|
* at the end. Each such packet is an individual ISO transfer. Isochronous
|
|
* URBs are normally queued, submitted by drivers to arrange that
|
|
* transfers are at least double buffered, and then explicitly resubmitted
|
|
* in completion handlers, so
|
|
* that data (such as audio or video) streams at as constant a rate as the
|
|
* host controller scheduler can support.
|
|
*
|
|
* Completion Callbacks:
|
|
*
|
|
* The completion callback is made in_interrupt(), and one of the first
|
|
* things that a completion handler should do is check the status field.
|
|
* The status field is provided for all URBs. It is used to report
|
|
* unlinked URBs, and status for all non-ISO transfers. It should not
|
|
* be examined before the URB is returned to the completion handler.
|
|
*
|
|
* The context field is normally used to link URBs back to the relevant
|
|
* driver or request state.
|
|
*
|
|
* When the completion callback is invoked for non-isochronous URBs, the
|
|
* actual_length field tells how many bytes were transferred. This field
|
|
* is updated even when the URB terminated with an error or was unlinked.
|
|
*
|
|
* ISO transfer status is reported in the status and actual_length fields
|
|
* of the iso_frame_desc array, and the number of errors is reported in
|
|
* error_count. Completion callbacks for ISO transfers will normally
|
|
* (re)submit URBs to ensure a constant transfer rate.
|
|
*
|
|
* Note that even fields marked "public" should not be touched by the driver
|
|
* when the urb is owned by the hcd, that is, since the call to
|
|
* usb_submit_urb() till the entry into the completion routine.
|
|
*/
|
|
struct urb {
|
|
/* private: usb core and host controller only fields in the urb */
|
|
struct kref kref; /* reference count of the URB */
|
|
void *hcpriv; /* private data for host controller */
|
|
atomic_t use_count; /* concurrent submissions counter */
|
|
atomic_t reject; /* submissions will fail */
|
|
int unlinked; /* unlink error code */
|
|
|
|
/* public: documented fields in the urb that can be used by drivers */
|
|
struct list_head urb_list; /* list head for use by the urb's
|
|
* current owner */
|
|
struct list_head anchor_list; /* the URB may be anchored */
|
|
struct usb_anchor *anchor;
|
|
struct usb_device *dev; /* (in) pointer to associated device */
|
|
struct usb_host_endpoint *ep; /* (internal) pointer to endpoint */
|
|
unsigned int pipe; /* (in) pipe information */
|
|
unsigned int stream_id; /* (in) stream ID */
|
|
int status; /* (return) non-ISO status */
|
|
unsigned int transfer_flags; /* (in) URB_SHORT_NOT_OK | ...*/
|
|
void *transfer_buffer; /* (in) associated data buffer */
|
|
dma_addr_t transfer_dma; /* (in) dma addr for transfer_buffer */
|
|
struct scatterlist *sg; /* (in) scatter gather buffer list */
|
|
int num_mapped_sgs; /* (internal) mapped sg entries */
|
|
int num_sgs; /* (in) number of entries in the sg list */
|
|
u32 transfer_buffer_length; /* (in) data buffer length */
|
|
u32 actual_length; /* (return) actual transfer length */
|
|
unsigned char *setup_packet; /* (in) setup packet (control only) */
|
|
dma_addr_t setup_dma; /* (in) dma addr for setup_packet */
|
|
int start_frame; /* (modify) start frame (ISO) */
|
|
int number_of_packets; /* (in) number of ISO packets */
|
|
int interval; /* (modify) transfer interval
|
|
* (INT/ISO) */
|
|
int error_count; /* (return) number of ISO errors */
|
|
void *context; /* (in) context for completion */
|
|
usb_complete_t complete; /* (in) completion routine */
|
|
struct usb_iso_packet_descriptor iso_frame_desc[0];
|
|
/* (in) ISO ONLY */
|
|
};
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
/**
|
|
* usb_fill_control_urb - initializes a control urb
|
|
* @urb: pointer to the urb to initialize.
|
|
* @dev: pointer to the struct usb_device for this urb.
|
|
* @pipe: the endpoint pipe
|
|
* @setup_packet: pointer to the setup_packet buffer
|
|
* @transfer_buffer: pointer to the transfer buffer
|
|
* @buffer_length: length of the transfer buffer
|
|
* @complete_fn: pointer to the usb_complete_t function
|
|
* @context: what to set the urb context to.
|
|
*
|
|
* Initializes a control urb with the proper information needed to submit
|
|
* it to a device.
|
|
*/
|
|
static inline void usb_fill_control_urb(struct urb *urb,
|
|
struct usb_device *dev,
|
|
unsigned int pipe,
|
|
unsigned char *setup_packet,
|
|
void *transfer_buffer,
|
|
int buffer_length,
|
|
usb_complete_t complete_fn,
|
|
void *context)
|
|
{
|
|
urb->dev = dev;
|
|
urb->pipe = pipe;
|
|
urb->setup_packet = setup_packet;
|
|
urb->transfer_buffer = transfer_buffer;
|
|
urb->transfer_buffer_length = buffer_length;
|
|
urb->complete = complete_fn;
|
|
urb->context = context;
|
|
}
|
|
|
|
/**
|
|
* usb_fill_bulk_urb - macro to help initialize a bulk urb
|
|
* @urb: pointer to the urb to initialize.
|
|
* @dev: pointer to the struct usb_device for this urb.
|
|
* @pipe: the endpoint pipe
|
|
* @transfer_buffer: pointer to the transfer buffer
|
|
* @buffer_length: length of the transfer buffer
|
|
* @complete_fn: pointer to the usb_complete_t function
|
|
* @context: what to set the urb context to.
|
|
*
|
|
* Initializes a bulk urb with the proper information needed to submit it
|
|
* to a device.
|
|
*/
|
|
static inline void usb_fill_bulk_urb(struct urb *urb,
|
|
struct usb_device *dev,
|
|
unsigned int pipe,
|
|
void *transfer_buffer,
|
|
int buffer_length,
|
|
usb_complete_t complete_fn,
|
|
void *context)
|
|
{
|
|
urb->dev = dev;
|
|
urb->pipe = pipe;
|
|
urb->transfer_buffer = transfer_buffer;
|
|
urb->transfer_buffer_length = buffer_length;
|
|
urb->complete = complete_fn;
|
|
urb->context = context;
|
|
}
|
|
|
|
/**
|
|
* usb_fill_int_urb - macro to help initialize a interrupt urb
|
|
* @urb: pointer to the urb to initialize.
|
|
* @dev: pointer to the struct usb_device for this urb.
|
|
* @pipe: the endpoint pipe
|
|
* @transfer_buffer: pointer to the transfer buffer
|
|
* @buffer_length: length of the transfer buffer
|
|
* @complete_fn: pointer to the usb_complete_t function
|
|
* @context: what to set the urb context to.
|
|
* @interval: what to set the urb interval to, encoded like
|
|
* the endpoint descriptor's bInterval value.
|
|
*
|
|
* Initializes a interrupt urb with the proper information needed to submit
|
|
* it to a device.
|
|
*
|
|
* Note that High Speed and SuperSpeed interrupt endpoints use a logarithmic
|
|
* encoding of the endpoint interval, and express polling intervals in
|
|
* microframes (eight per millisecond) rather than in frames (one per
|
|
* millisecond).
|
|
*
|
|
* Wireless USB also uses the logarithmic encoding, but specifies it in units of
|
|
* 128us instead of 125us. For Wireless USB devices, the interval is passed
|
|
* through to the host controller, rather than being translated into microframe
|
|
* units.
|
|
*/
|
|
static inline void usb_fill_int_urb(struct urb *urb,
|
|
struct usb_device *dev,
|
|
unsigned int pipe,
|
|
void *transfer_buffer,
|
|
int buffer_length,
|
|
usb_complete_t complete_fn,
|
|
void *context,
|
|
int interval)
|
|
{
|
|
urb->dev = dev;
|
|
urb->pipe = pipe;
|
|
urb->transfer_buffer = transfer_buffer;
|
|
urb->transfer_buffer_length = buffer_length;
|
|
urb->complete = complete_fn;
|
|
urb->context = context;
|
|
if (dev->speed == USB_SPEED_HIGH || dev->speed == USB_SPEED_SUPER)
|
|
urb->interval = 1 << (interval - 1);
|
|
else
|
|
urb->interval = interval;
|
|
urb->start_frame = -1;
|
|
}
|
|
|
|
extern void usb_init_urb(struct urb *urb);
|
|
extern struct urb *usb_alloc_urb(int iso_packets, gfp_t mem_flags);
|
|
extern void usb_free_urb(struct urb *urb);
|
|
#define usb_put_urb usb_free_urb
|
|
extern struct urb *usb_get_urb(struct urb *urb);
|
|
extern int usb_submit_urb(struct urb *urb, gfp_t mem_flags);
|
|
extern int usb_unlink_urb(struct urb *urb);
|
|
extern void usb_kill_urb(struct urb *urb);
|
|
extern void usb_poison_urb(struct urb *urb);
|
|
extern void usb_unpoison_urb(struct urb *urb);
|
|
extern void usb_block_urb(struct urb *urb);
|
|
extern void usb_kill_anchored_urbs(struct usb_anchor *anchor);
|
|
extern void usb_poison_anchored_urbs(struct usb_anchor *anchor);
|
|
extern void usb_unpoison_anchored_urbs(struct usb_anchor *anchor);
|
|
extern void usb_unlink_anchored_urbs(struct usb_anchor *anchor);
|
|
extern void usb_anchor_urb(struct urb *urb, struct usb_anchor *anchor);
|
|
extern void usb_unanchor_urb(struct urb *urb);
|
|
extern int usb_wait_anchor_empty_timeout(struct usb_anchor *anchor,
|
|
unsigned int timeout);
|
|
extern struct urb *usb_get_from_anchor(struct usb_anchor *anchor);
|
|
extern void usb_scuttle_anchored_urbs(struct usb_anchor *anchor);
|
|
extern int usb_anchor_empty(struct usb_anchor *anchor);
|
|
|
|
#define usb_unblock_urb usb_unpoison_urb
|
|
|
|
/**
|
|
* usb_urb_dir_in - check if an URB describes an IN transfer
|
|
* @urb: URB to be checked
|
|
*
|
|
* Returns 1 if @urb describes an IN transfer (device-to-host),
|
|
* otherwise 0.
|
|
*/
|
|
static inline int usb_urb_dir_in(struct urb *urb)
|
|
{
|
|
return (urb->transfer_flags & URB_DIR_MASK) == URB_DIR_IN;
|
|
}
|
|
|
|
/**
|
|
* usb_urb_dir_out - check if an URB describes an OUT transfer
|
|
* @urb: URB to be checked
|
|
*
|
|
* Returns 1 if @urb describes an OUT transfer (host-to-device),
|
|
* otherwise 0.
|
|
*/
|
|
static inline int usb_urb_dir_out(struct urb *urb)
|
|
{
|
|
return (urb->transfer_flags & URB_DIR_MASK) == URB_DIR_OUT;
|
|
}
|
|
|
|
void *usb_alloc_coherent(struct usb_device *dev, size_t size,
|
|
gfp_t mem_flags, dma_addr_t *dma);
|
|
void usb_free_coherent(struct usb_device *dev, size_t size,
|
|
void *addr, dma_addr_t dma);
|
|
|
|
#if 0
|
|
struct urb *usb_buffer_map(struct urb *urb);
|
|
void usb_buffer_dmasync(struct urb *urb);
|
|
void usb_buffer_unmap(struct urb *urb);
|
|
#endif
|
|
|
|
struct scatterlist;
|
|
int usb_buffer_map_sg(const struct usb_device *dev, int is_in,
|
|
struct scatterlist *sg, int nents);
|
|
#if 0
|
|
void usb_buffer_dmasync_sg(const struct usb_device *dev, int is_in,
|
|
struct scatterlist *sg, int n_hw_ents);
|
|
#endif
|
|
void usb_buffer_unmap_sg(const struct usb_device *dev, int is_in,
|
|
struct scatterlist *sg, int n_hw_ents);
|
|
|
|
/*-------------------------------------------------------------------*
|
|
* SYNCHRONOUS CALL SUPPORT *
|
|
*-------------------------------------------------------------------*/
|
|
|
|
extern int usb_control_msg(struct usb_device *dev, unsigned int pipe,
|
|
__u8 request, __u8 requesttype, __u16 value, __u16 index,
|
|
void *data, __u16 size, int timeout);
|
|
extern int usb_interrupt_msg(struct usb_device *usb_dev, unsigned int pipe,
|
|
void *data, int len, int *actual_length, int timeout);
|
|
extern int usb_bulk_msg(struct usb_device *usb_dev, unsigned int pipe,
|
|
void *data, int len, int *actual_length,
|
|
int timeout);
|
|
|
|
/* wrappers around usb_control_msg() for the most common standard requests */
|
|
extern int usb_get_descriptor(struct usb_device *dev, unsigned char desctype,
|
|
unsigned char descindex, void *buf, int size);
|
|
extern int usb_get_status(struct usb_device *dev,
|
|
int type, int target, void *data);
|
|
extern int usb_string(struct usb_device *dev, int index,
|
|
char *buf, size_t size);
|
|
|
|
/* wrappers that also update important state inside usbcore */
|
|
extern int usb_clear_halt(struct usb_device *dev, int pipe);
|
|
extern int usb_reset_configuration(struct usb_device *dev);
|
|
extern int usb_set_interface(struct usb_device *dev, int ifnum, int alternate);
|
|
extern void usb_reset_endpoint(struct usb_device *dev, unsigned int epaddr);
|
|
|
|
/* this request isn't really synchronous, but it belongs with the others */
|
|
extern int usb_driver_set_configuration(struct usb_device *udev, int config);
|
|
|
|
/*
|
|
* timeouts, in milliseconds, used for sending/receiving control messages
|
|
* they typically complete within a few frames (msec) after they're issued
|
|
* USB identifies 5 second timeouts, maybe more in a few cases, and a few
|
|
* slow devices (like some MGE Ellipse UPSes) actually push that limit.
|
|
*/
|
|
#define USB_CTRL_GET_TIMEOUT 5000
|
|
#define USB_CTRL_SET_TIMEOUT 5000
|
|
|
|
|
|
/**
|
|
* struct usb_sg_request - support for scatter/gather I/O
|
|
* @status: zero indicates success, else negative errno
|
|
* @bytes: counts bytes transferred.
|
|
*
|
|
* These requests are initialized using usb_sg_init(), and then are used
|
|
* as request handles passed to usb_sg_wait() or usb_sg_cancel(). Most
|
|
* members of the request object aren't for driver access.
|
|
*
|
|
* The status and bytecount values are valid only after usb_sg_wait()
|
|
* returns. If the status is zero, then the bytecount matches the total
|
|
* from the request.
|
|
*
|
|
* After an error completion, drivers may need to clear a halt condition
|
|
* on the endpoint.
|
|
*/
|
|
struct usb_sg_request {
|
|
int status;
|
|
size_t bytes;
|
|
|
|
/* private:
|
|
* members below are private to usbcore,
|
|
* and are not provided for driver access!
|
|
*/
|
|
spinlock_t lock;
|
|
|
|
struct usb_device *dev;
|
|
int pipe;
|
|
|
|
int entries;
|
|
struct urb **urbs;
|
|
|
|
int count;
|
|
struct completion complete;
|
|
};
|
|
|
|
int usb_sg_init(
|
|
struct usb_sg_request *io,
|
|
struct usb_device *dev,
|
|
unsigned pipe,
|
|
unsigned period,
|
|
struct scatterlist *sg,
|
|
int nents,
|
|
size_t length,
|
|
gfp_t mem_flags
|
|
);
|
|
void usb_sg_cancel(struct usb_sg_request *io);
|
|
void usb_sg_wait(struct usb_sg_request *io);
|
|
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
/*
|
|
* For various legacy reasons, Linux has a small cookie that's paired with
|
|
* a struct usb_device to identify an endpoint queue. Queue characteristics
|
|
* are defined by the endpoint's descriptor. This cookie is called a "pipe",
|
|
* an unsigned int encoded as:
|
|
*
|
|
* - direction: bit 7 (0 = Host-to-Device [Out],
|
|
* 1 = Device-to-Host [In] ...
|
|
* like endpoint bEndpointAddress)
|
|
* - device address: bits 8-14 ... bit positions known to uhci-hcd
|
|
* - endpoint: bits 15-18 ... bit positions known to uhci-hcd
|
|
* - pipe type: bits 30-31 (00 = isochronous, 01 = interrupt,
|
|
* 10 = control, 11 = bulk)
|
|
*
|
|
* Given the device address and endpoint descriptor, pipes are redundant.
|
|
*/
|
|
|
|
/* NOTE: these are not the standard USB_ENDPOINT_XFER_* values!! */
|
|
/* (yet ... they're the values used by usbfs) */
|
|
#define PIPE_ISOCHRONOUS 0
|
|
#define PIPE_INTERRUPT 1
|
|
#define PIPE_CONTROL 2
|
|
#define PIPE_BULK 3
|
|
|
|
#define usb_pipein(pipe) ((pipe) & USB_DIR_IN)
|
|
#define usb_pipeout(pipe) (!usb_pipein(pipe))
|
|
|
|
#define usb_pipedevice(pipe) (((pipe) >> 8) & 0x7f)
|
|
#define usb_pipeendpoint(pipe) (((pipe) >> 15) & 0xf)
|
|
|
|
#define usb_pipetype(pipe) (((pipe) >> 30) & 3)
|
|
#define usb_pipeisoc(pipe) (usb_pipetype((pipe)) == PIPE_ISOCHRONOUS)
|
|
#define usb_pipeint(pipe) (usb_pipetype((pipe)) == PIPE_INTERRUPT)
|
|
#define usb_pipecontrol(pipe) (usb_pipetype((pipe)) == PIPE_CONTROL)
|
|
#define usb_pipebulk(pipe) (usb_pipetype((pipe)) == PIPE_BULK)
|
|
|
|
static inline unsigned int __create_pipe(struct usb_device *dev,
|
|
unsigned int endpoint)
|
|
{
|
|
return (dev->devnum << 8) | (endpoint << 15);
|
|
}
|
|
|
|
/* Create various pipes... */
|
|
#define usb_sndctrlpipe(dev, endpoint) \
|
|
((PIPE_CONTROL << 30) | __create_pipe(dev, endpoint))
|
|
#define usb_rcvctrlpipe(dev, endpoint) \
|
|
((PIPE_CONTROL << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN)
|
|
#define usb_sndisocpipe(dev, endpoint) \
|
|
((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev, endpoint))
|
|
#define usb_rcvisocpipe(dev, endpoint) \
|
|
((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN)
|
|
#define usb_sndbulkpipe(dev, endpoint) \
|
|
((PIPE_BULK << 30) | __create_pipe(dev, endpoint))
|
|
#define usb_rcvbulkpipe(dev, endpoint) \
|
|
((PIPE_BULK << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN)
|
|
#define usb_sndintpipe(dev, endpoint) \
|
|
((PIPE_INTERRUPT << 30) | __create_pipe(dev, endpoint))
|
|
#define usb_rcvintpipe(dev, endpoint) \
|
|
((PIPE_INTERRUPT << 30) | __create_pipe(dev, endpoint) | USB_DIR_IN)
|
|
|
|
static inline struct usb_host_endpoint *
|
|
usb_pipe_endpoint(struct usb_device *dev, unsigned int pipe)
|
|
{
|
|
struct usb_host_endpoint **eps;
|
|
eps = usb_pipein(pipe) ? dev->ep_in : dev->ep_out;
|
|
return eps[usb_pipeendpoint(pipe)];
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
static inline __u16
|
|
usb_maxpacket(struct usb_device *udev, int pipe, int is_out)
|
|
{
|
|
struct usb_host_endpoint *ep;
|
|
unsigned epnum = usb_pipeendpoint(pipe);
|
|
|
|
if (is_out) {
|
|
WARN_ON(usb_pipein(pipe));
|
|
ep = udev->ep_out[epnum];
|
|
} else {
|
|
WARN_ON(usb_pipeout(pipe));
|
|
ep = udev->ep_in[epnum];
|
|
}
|
|
if (!ep)
|
|
return 0;
|
|
|
|
/* NOTE: only 0x07ff bits are for packet size... */
|
|
return usb_endpoint_maxp(&ep->desc);
|
|
}
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
/* translate USB error codes to codes user space understands */
|
|
static inline int usb_translate_errors(int error_code)
|
|
{
|
|
switch (error_code) {
|
|
case 0:
|
|
case -ENOMEM:
|
|
case -ENODEV:
|
|
case -EOPNOTSUPP:
|
|
return error_code;
|
|
default:
|
|
return -EIO;
|
|
}
|
|
}
|
|
|
|
/* Events from the usb core */
|
|
#define USB_DEVICE_ADD 0x0001
|
|
#define USB_DEVICE_REMOVE 0x0002
|
|
#define USB_BUS_ADD 0x0003
|
|
#define USB_BUS_REMOVE 0x0004
|
|
extern void usb_register_notify(struct notifier_block *nb);
|
|
extern void usb_unregister_notify(struct notifier_block *nb);
|
|
|
|
/* debugfs stuff */
|
|
extern struct dentry *usb_debug_root;
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif
|