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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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93bacefc4c
Thanks to Johannes Hölzl <johannes.hoelzl@gmx.de> for fixing a few things and getting it all working properly. This adds support for dynamic usb ids to the usb serial core. The file "new_id" will show up under the usb serial driver, not the usb driver associated with the usb-serial driver (yeah, it can be a bit confusing at first glance...) This patch also modifies the USB core to allow the usb-serial core to reuse much of the dynamic id logic. Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Johannes Hölzl <johannes.hoelzl@gmx.de>
1475 lines
56 KiB
C
1475 lines
56 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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struct usb_device;
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struct usb_driver;
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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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*
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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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* @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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*
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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 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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};
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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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/* 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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unsigned char *extra; /* Extra descriptors */
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int extralen;
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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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* @num_altsetting: number of altsettings defined.
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* @cur_altsetting: the current altsetting.
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* @driver: the USB driver that is bound to this interface.
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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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* @is_active: flag set when the interface is bound and not suspended.
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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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* @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; autosuspend is not
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* allowed unless the counter is 0.
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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 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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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 is_active:1; /* the interface is not suspended */
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unsigned needs_remote_wakeup:1; /* driver requires remote wakeup */
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struct device dev; /* interface specific device info */
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struct device *usb_dev; /* pointer to the usb class's device, if any */
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int pm_usage_cnt; /* usage counter for autosuspend */
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};
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#define to_usb_interface(d) container_of(d, struct usb_interface, dev)
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#define interface_to_usbdev(intf) \
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container_of(intf->dev.parent, struct usb_device, 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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/**
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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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* @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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/* 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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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,(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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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 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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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 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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struct dentry *usbfs_dentry; /* usbfs dentry entry for the bus */
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struct class_device *class_dev; /* class device for this bus */
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#if defined(CONFIG_USB_MON)
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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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/*
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* struct usb_device - kernel's representation of a USB device
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*
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* FIXME: Write the kerneldoc!
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*
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* Usbcore drivers should not set usbdev->state directly. Instead use
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* usb_set_device_state().
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*/
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struct usb_device {
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int devnum; /* Address on USB bus */
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char devpath [16]; /* Use in messages: /port/port/... */
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enum usb_device_state state; /* configured, not attached, etc */
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enum usb_device_speed speed; /* high/full/low (or error) */
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struct usb_tt *tt; /* low/full speed dev, highspeed hub */
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int ttport; /* device port on that tt hub */
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unsigned int toggle[2]; /* one bit for each endpoint
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* ([0] = IN, [1] = OUT) */
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struct usb_device *parent; /* our hub, unless we're the root */
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struct usb_bus *bus; /* Bus we're part of */
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struct usb_host_endpoint ep0;
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struct device dev; /* Generic device interface */
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struct usb_device_descriptor descriptor;/* Descriptor */
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struct usb_host_config *config; /* All of the configs */
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struct usb_host_config *actconfig;/* the active configuration */
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struct usb_host_endpoint *ep_in[16];
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struct usb_host_endpoint *ep_out[16];
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char **rawdescriptors; /* Raw descriptors for each config */
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unsigned short bus_mA; /* Current available from the bus */
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u8 portnum; /* Parent port number (origin 1) */
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u8 level; /* Number of USB hub ancestors */
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unsigned discon_suspended:1; /* Disconnected while suspended */
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unsigned have_langid:1; /* whether string_langid is valid */
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int string_langid; /* language ID for strings */
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/* static strings from the device */
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char *product; /* iProduct string, if present */
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char *manufacturer; /* iManufacturer string, if present */
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char *serial; /* iSerialNumber string, if present */
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struct list_head filelist;
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struct device *usbfs_dev;
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struct dentry *usbfs_dentry; /* usbfs dentry entry for the device */
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/*
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* Child devices - these can be either new devices
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* (if this is a hub device), or different instances
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* of this same device.
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*
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* Each instance needs its own set of data structures.
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*/
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int maxchild; /* Number of ports if hub */
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struct usb_device *children[USB_MAXCHILDREN];
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int pm_usage_cnt; /* usage counter for autosuspend */
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#ifdef CONFIG_PM
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struct delayed_work autosuspend; /* for delayed autosuspends */
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struct mutex pm_mutex; /* protects PM operations */
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unsigned auto_pm:1; /* autosuspend/resume in progress */
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unsigned do_remote_wakeup:1; /* remote wakeup should be enabled */
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#endif
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};
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#define to_usb_device(d) container_of(d, struct usb_device, dev)
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extern struct usb_device *usb_get_dev(struct usb_device *dev);
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extern void usb_put_dev(struct usb_device *dev);
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/* USB device locking */
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#define usb_lock_device(udev) down(&(udev)->dev.sem)
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#define usb_unlock_device(udev) up(&(udev)->dev.sem)
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#define usb_trylock_device(udev) down_trylock(&(udev)->dev.sem)
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extern int usb_lock_device_for_reset(struct usb_device *udev,
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const struct usb_interface *iface);
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/* USB port reset for device reinitialization */
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extern int usb_reset_device(struct usb_device *dev);
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extern int usb_reset_composite_device(struct usb_device *dev,
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struct usb_interface *iface);
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extern struct usb_device *usb_find_device(u16 vendor_id, u16 product_id);
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/* USB autosuspend and autoresume */
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#ifdef CONFIG_USB_SUSPEND
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extern int usb_autopm_set_interface(struct usb_interface *intf);
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extern int usb_autopm_get_interface(struct usb_interface *intf);
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extern void usb_autopm_put_interface(struct usb_interface *intf);
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static inline void usb_autopm_enable(struct usb_interface *intf)
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{
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intf->pm_usage_cnt = 0;
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usb_autopm_set_interface(intf);
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}
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static inline void usb_autopm_disable(struct usb_interface *intf)
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{
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intf->pm_usage_cnt = 1;
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usb_autopm_set_interface(intf);
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}
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#else
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static inline int usb_autopm_set_interface(struct usb_interface *intf)
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{ return 0; }
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static inline int usb_autopm_get_interface(struct usb_interface *intf)
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{ return 0; }
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static inline void usb_autopm_put_interface(struct usb_interface *intf)
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{ }
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static inline void usb_autopm_enable(struct usb_interface *intf)
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{ }
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static inline void usb_autopm_disable(struct usb_interface *intf)
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{ }
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#endif
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/*-------------------------------------------------------------------------*/
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/* for drivers using iso endpoints */
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extern int usb_get_current_frame_number (struct usb_device *usb_dev);
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/* used these for multi-interface device registration */
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extern int usb_driver_claim_interface(struct usb_driver *driver,
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struct usb_interface *iface, void* priv);
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/**
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* usb_interface_claimed - returns true iff an interface is claimed
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* @iface: the interface being checked
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*
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* Returns true (nonzero) iff the interface is claimed, else false (zero).
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* 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);
|
|
|
|
|
|
/**
|
|
* 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 identifers;
|
|
* 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;
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
/**
|
|
* usb_endpoint_dir_in - check if the endpoint has IN direction
|
|
* @epd: endpoint to be checked
|
|
*
|
|
* Returns true if the endpoint is of type IN, otherwise it returns false.
|
|
*/
|
|
static inline int usb_endpoint_dir_in(const struct usb_endpoint_descriptor *epd)
|
|
{
|
|
return ((epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_IN);
|
|
}
|
|
|
|
/**
|
|
* usb_endpoint_dir_out - check if the endpoint has OUT direction
|
|
* @epd: endpoint to be checked
|
|
*
|
|
* Returns true if the endpoint is of type OUT, otherwise it returns false.
|
|
*/
|
|
static inline int usb_endpoint_dir_out(const struct usb_endpoint_descriptor *epd)
|
|
{
|
|
return ((epd->bEndpointAddress & USB_ENDPOINT_DIR_MASK) == USB_DIR_OUT);
|
|
}
|
|
|
|
/**
|
|
* usb_endpoint_xfer_bulk - check if the endpoint has bulk transfer type
|
|
* @epd: endpoint to be checked
|
|
*
|
|
* Returns true if the endpoint is of type bulk, otherwise it returns false.
|
|
*/
|
|
static inline int usb_endpoint_xfer_bulk(const struct usb_endpoint_descriptor *epd)
|
|
{
|
|
return ((epd->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
|
|
USB_ENDPOINT_XFER_BULK);
|
|
}
|
|
|
|
/**
|
|
* usb_endpoint_xfer_int - check if the endpoint has interrupt transfer type
|
|
* @epd: endpoint to be checked
|
|
*
|
|
* Returns true if the endpoint is of type interrupt, otherwise it returns
|
|
* false.
|
|
*/
|
|
static inline int usb_endpoint_xfer_int(const struct usb_endpoint_descriptor *epd)
|
|
{
|
|
return ((epd->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
|
|
USB_ENDPOINT_XFER_INT);
|
|
}
|
|
|
|
/**
|
|
* usb_endpoint_xfer_isoc - check if the endpoint has isochronous transfer type
|
|
* @epd: endpoint to be checked
|
|
*
|
|
* Returns true if the endpoint is of type isochronous, otherwise it returns
|
|
* false.
|
|
*/
|
|
static inline int usb_endpoint_xfer_isoc(const struct usb_endpoint_descriptor *epd)
|
|
{
|
|
return ((epd->bmAttributes & USB_ENDPOINT_XFERTYPE_MASK) ==
|
|
USB_ENDPOINT_XFER_ISOC);
|
|
}
|
|
|
|
/**
|
|
* usb_endpoint_is_bulk_in - check if the endpoint is bulk IN
|
|
* @epd: endpoint to be checked
|
|
*
|
|
* Returns true if the endpoint has bulk transfer type and IN direction,
|
|
* otherwise it returns false.
|
|
*/
|
|
static inline int usb_endpoint_is_bulk_in(const struct usb_endpoint_descriptor *epd)
|
|
{
|
|
return (usb_endpoint_xfer_bulk(epd) && usb_endpoint_dir_in(epd));
|
|
}
|
|
|
|
/**
|
|
* usb_endpoint_is_bulk_out - check if the endpoint is bulk OUT
|
|
* @epd: endpoint to be checked
|
|
*
|
|
* Returns true if the endpoint has bulk transfer type and OUT direction,
|
|
* otherwise it returns false.
|
|
*/
|
|
static inline int usb_endpoint_is_bulk_out(const struct usb_endpoint_descriptor *epd)
|
|
{
|
|
return (usb_endpoint_xfer_bulk(epd) && usb_endpoint_dir_out(epd));
|
|
}
|
|
|
|
/**
|
|
* usb_endpoint_is_int_in - check if the endpoint is interrupt IN
|
|
* @epd: endpoint to be checked
|
|
*
|
|
* Returns true if the endpoint has interrupt transfer type and IN direction,
|
|
* otherwise it returns false.
|
|
*/
|
|
static inline int usb_endpoint_is_int_in(const struct usb_endpoint_descriptor *epd)
|
|
{
|
|
return (usb_endpoint_xfer_int(epd) && usb_endpoint_dir_in(epd));
|
|
}
|
|
|
|
/**
|
|
* usb_endpoint_is_int_out - check if the endpoint is interrupt OUT
|
|
* @epd: endpoint to be checked
|
|
*
|
|
* Returns true if the endpoint has interrupt transfer type and OUT direction,
|
|
* otherwise it returns false.
|
|
*/
|
|
static inline int usb_endpoint_is_int_out(const struct usb_endpoint_descriptor *epd)
|
|
{
|
|
return (usb_endpoint_xfer_int(epd) && usb_endpoint_dir_out(epd));
|
|
}
|
|
|
|
/**
|
|
* usb_endpoint_is_isoc_in - check if the endpoint is isochronous IN
|
|
* @epd: endpoint to be checked
|
|
*
|
|
* Returns true if the endpoint has isochronous transfer type and IN direction,
|
|
* otherwise it returns false.
|
|
*/
|
|
static inline int usb_endpoint_is_isoc_in(const struct usb_endpoint_descriptor *epd)
|
|
{
|
|
return (usb_endpoint_xfer_isoc(epd) && usb_endpoint_dir_in(epd));
|
|
}
|
|
|
|
/**
|
|
* usb_endpoint_is_isoc_out - check if the endpoint is isochronous OUT
|
|
* @epd: endpoint to be checked
|
|
*
|
|
* Returns true if the endpoint has isochronous transfer type and OUT direction,
|
|
* otherwise it returns false.
|
|
*/
|
|
static inline int usb_endpoint_is_isoc_out(const struct usb_endpoint_descriptor *epd)
|
|
{
|
|
return (usb_endpoint_xfer_isoc(epd) && usb_endpoint_dir_out(epd));
|
|
}
|
|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
#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 - macro used to 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_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)
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
/* 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);
|
|
|
|
/**
|
|
* 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
|
|
* dev_set_drvdata() 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 a 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.
|
|
* @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.
|
|
* @pre_reset: Called by usb_reset_composite_device() when the device
|
|
* is about to be reset.
|
|
* @post_reset: Called by usb_reset_composite_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.
|
|
*
|
|
* 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 (*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);
|
|
|
|
void (*pre_reset) (struct usb_interface *intf);
|
|
void (*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;
|
|
};
|
|
#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);
|
|
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.
|
|
* @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;
|
|
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 *);
|
|
static inline int usb_register(struct usb_driver *driver)
|
|
{
|
|
return usb_register_driver(driver, THIS_MODULE);
|
|
}
|
|
extern void usb_deregister(struct usb_driver *);
|
|
|
|
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:
|
|
*/
|
|
#define URB_SHORT_NOT_OK 0x0001 /* report short reads as errors */
|
|
#define URB_ISO_ASAP 0x0002 /* iso-only, urb->start_frame
|
|
* ignored */
|
|
#define URB_NO_TRANSFER_DMA_MAP 0x0004 /* urb->transfer_dma valid on submit */
|
|
#define URB_NO_SETUP_DMA_MAP 0x0008 /* urb->setup_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 */
|
|
|
|
struct usb_iso_packet_descriptor {
|
|
unsigned int offset;
|
|
unsigned int length; /* expected length */
|
|
unsigned int actual_length;
|
|
unsigned int status;
|
|
};
|
|
|
|
struct urb;
|
|
|
|
typedef void (*usb_complete_t)(struct urb *);
|
|
|
|
/**
|
|
* struct urb - USB Request Block
|
|
* @urb_list: For use by current owner of the URB.
|
|
* @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.
|
|
* @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). 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.
|
|
* @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: For control transfers with URB_NO_SETUP_DMA_MAP set, the
|
|
* device driver has provided this DMA address for the setup packet.
|
|
* The host controller driver should use this in preference to
|
|
* setup_packet.
|
|
* @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 for full and low
|
|
* speed devices, and microframes (1/8 millisecond) for highspeed ones.
|
|
* @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_xxx_DMA_MAP transfer flags,
|
|
* which tell the host controller driver that no such mapping is needed since
|
|
* the device driver is DMA-aware. For example, a device driver might
|
|
* allocate a DMA buffer with usb_buffer_alloc() or call usb_buffer_map().
|
|
* When these transfer flags are provided, host controller drivers will
|
|
* attempt to use the dma addresses found in the transfer_dma and/or
|
|
* setup_dma fields rather than determining a dma address themselves. (Note
|
|
* that transfer_buffer and setup_packet must still be set because not all
|
|
* host controllers use DMA, nor do virtual root hubs).
|
|
*
|
|
* 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 setup_packet. The setup_packet and
|
|
* transfer_buffer may each be mapped for DMA or not, independently of
|
|
* the other. The transfer_flags bits URB_NO_TRANSFER_DMA_MAP and
|
|
* URB_NO_SETUP_DMA_MAP indicate which buffers have already been mapped.
|
|
* URB_NO_SETUP_DMA_MAP is ignored for non-control URBs.
|
|
*
|
|
* 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.)
|
|
*
|
|
* Isochronous URBs normally use the URB_ISO_ASAP transfer flag, telling
|
|
* the host controller to schedule the transfer as soon as bandwidth
|
|
* utilization allows, and then set start_frame to reflect the actual frame
|
|
* selected during submission. Otherwise drivers must specify the start_frame
|
|
* and handle the case where the transfer can't begin then. However, drivers
|
|
* won't know how bandwidth is currently allocated, and while they can
|
|
* find the current frame using usb_get_current_frame_number () they can't
|
|
* know the range for that frame number. (Ranges for frame counter values
|
|
* are HC-specific, and can go from 256 to 65536 frames from "now".)
|
|
*
|
|
* 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 */
|
|
spinlock_t lock; /* lock for the URB */
|
|
void *hcpriv; /* private data for host controller */
|
|
int bandwidth; /* bandwidth for INT/ISO request */
|
|
atomic_t use_count; /* concurrent submissions counter */
|
|
u8 reject; /* submissions will fail */
|
|
|
|
/* 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 usb_device *dev; /* (in) pointer to associated device */
|
|
unsigned int pipe; /* (in) pipe information */
|
|
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 */
|
|
int transfer_buffer_length; /* (in) data buffer length */
|
|
int 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)
|
|
{
|
|
spin_lock_init(&urb->lock);
|
|
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)
|
|
{
|
|
spin_lock_init(&urb->lock);
|
|
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 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).
|
|
*/
|
|
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)
|
|
{
|
|
spin_lock_init(&urb->lock);
|
|
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)
|
|
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);
|
|
|
|
void *usb_buffer_alloc (struct usb_device *dev, size_t size,
|
|
gfp_t mem_flags, dma_addr_t *dma);
|
|
void usb_buffer_free (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, unsigned pipe,
|
|
struct scatterlist *sg, int nents);
|
|
#if 0
|
|
void usb_buffer_dmasync_sg(const struct usb_device *dev, unsigned pipe,
|
|
struct scatterlist *sg, int n_hw_ents);
|
|
#endif
|
|
void usb_buffer_unmap_sg(const struct usb_device *dev, unsigned pipe,
|
|
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);
|
|
|
|
/* 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;
|
|
|
|
/*
|
|
* members below are private: to usbcore,
|
|
* and are not provided for driver access!
|
|
*/
|
|
spinlock_t lock;
|
|
|
|
struct usb_device *dev;
|
|
int pipe;
|
|
struct scatterlist *sg;
|
|
int nents;
|
|
|
|
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)
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#define usb_pipeout(pipe) (!usb_pipein(pipe))
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#define usb_pipedevice(pipe) (((pipe) >> 8) & 0x7f)
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#define usb_pipeendpoint(pipe) (((pipe) >> 15) & 0xf)
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#define usb_pipetype(pipe) (((pipe) >> 30) & 3)
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#define usb_pipeisoc(pipe) (usb_pipetype((pipe)) == PIPE_ISOCHRONOUS)
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#define usb_pipeint(pipe) (usb_pipetype((pipe)) == PIPE_INTERRUPT)
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#define usb_pipecontrol(pipe) (usb_pipetype((pipe)) == PIPE_CONTROL)
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#define usb_pipebulk(pipe) (usb_pipetype((pipe)) == PIPE_BULK)
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|
|
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/* The D0/D1 toggle bits ... USE WITH CAUTION (they're almost hcd-internal) */
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#define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> (ep)) & 1)
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#define usb_dotoggle(dev, ep, out) ((dev)->toggle[out] ^= (1 << (ep)))
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#define usb_settoggle(dev, ep, out, bit) \
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((dev)->toggle[out] = ((dev)->toggle[out] & ~(1 << (ep))) | \
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((bit) << (ep)))
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|
|
|
|
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static inline unsigned int __create_pipe(struct usb_device *dev,
|
|
unsigned int endpoint)
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|
{
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|
return (dev->devnum << 8) | (endpoint << 15);
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}
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|
|
|
/* Create various pipes... */
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|
#define usb_sndctrlpipe(dev,endpoint) \
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((PIPE_CONTROL << 30) | __create_pipe(dev,endpoint))
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#define usb_rcvctrlpipe(dev,endpoint) \
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((PIPE_CONTROL << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN)
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|
#define usb_sndisocpipe(dev,endpoint) \
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((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev,endpoint))
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|
#define usb_rcvisocpipe(dev,endpoint) \
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|
((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN)
|
|
#define usb_sndbulkpipe(dev,endpoint) \
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|
((PIPE_BULK << 30) | __create_pipe(dev,endpoint))
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|
#define usb_rcvbulkpipe(dev,endpoint) \
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|
((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)
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|
|
|
/*-------------------------------------------------------------------------*/
|
|
|
|
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];
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|
} else {
|
|
WARN_ON(usb_pipeout(pipe));
|
|
ep = udev->ep_in[epnum];
|
|
}
|
|
if (!ep)
|
|
return 0;
|
|
|
|
/* NOTE: only 0x07ff bits are for packet size... */
|
|
return le16_to_cpu(ep->desc.wMaxPacketSize);
|
|
}
|
|
|
|
/* ----------------------------------------------------------------------- */
|
|
|
|
/* 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);
|
|
|
|
#ifdef DEBUG
|
|
#define dbg(format, arg...) printk(KERN_DEBUG "%s: " format "\n" , \
|
|
__FILE__ , ## arg)
|
|
#else
|
|
#define dbg(format, arg...) do {} while (0)
|
|
#endif
|
|
|
|
#define err(format, arg...) printk(KERN_ERR "%s: " format "\n" , \
|
|
__FILE__ , ## arg)
|
|
#define info(format, arg...) printk(KERN_INFO "%s: " format "\n" , \
|
|
__FILE__ , ## arg)
|
|
#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n" , \
|
|
__FILE__ , ## arg)
|
|
|
|
|
|
#endif /* __KERNEL__ */
|
|
|
|
#endif
|