4 #include <linux/mod_devicetable.h>
5 #include <linux/usb_ch9.h>
8 #define USB_DEVICE_MAJOR 189
13 #include <linux/errno.h> /* for -ENODEV */
14 #include <linux/delay.h> /* for mdelay() */
15 #include <linux/interrupt.h> /* for in_interrupt() */
16 #include <linux/list.h> /* for struct list_head */
17 #include <linux/kref.h> /* for struct kref */
18 #include <linux/device.h> /* for struct device */
19 #include <linux/fs.h> /* for struct file_operations */
20 #include <linux/completion.h> /* for struct completion */
21 #include <linux/sched.h> /* for current && schedule_timeout */
26 /*-------------------------------------------------------------------------*/
29 * Host-side wrappers for standard USB descriptors ... these are parsed
30 * from the data provided by devices. Parsing turns them from a flat
31 * sequence of descriptors into a hierarchy:
33 * - devices have one (usually) or more configs;
34 * - configs have one (often) or more interfaces;
35 * - interfaces have one (usually) or more settings;
36 * - each interface setting has zero or (usually) more endpoints.
38 * And there might be other descriptors mixed in with those.
40 * Devices may also have class-specific or vendor-specific descriptors.
46 * struct usb_host_endpoint - host-side endpoint descriptor and queue
47 * @desc: descriptor for this endpoint, wMaxPacketSize in native byteorder
48 * @urb_list: urbs queued to this endpoint; maintained by usbcore
49 * @hcpriv: for use by HCD; typically holds hardware dma queue head (QH)
50 * with one or more transfer descriptors (TDs) per urb
51 * @ep_dev: ep_device for sysfs info
52 * @extra: descriptors following this endpoint in the configuration
53 * @extralen: how many bytes of "extra" are valid
55 * USB requests are always queued to a given endpoint, identified by a
56 * descriptor within an active interface in a given USB configuration.
58 struct usb_host_endpoint
{
59 struct usb_endpoint_descriptor desc
;
60 struct list_head urb_list
;
62 struct ep_device
*ep_dev
; /* For sysfs info */
64 unsigned char *extra
; /* Extra descriptors */
68 /* host-side wrapper for one interface setting's parsed descriptors */
69 struct usb_host_interface
{
70 struct usb_interface_descriptor desc
;
72 /* array of desc.bNumEndpoint endpoints associated with this
73 * interface setting. these will be in no particular order.
75 struct usb_host_endpoint
*endpoint
;
77 char *string
; /* iInterface string, if present */
78 unsigned char *extra
; /* Extra descriptors */
82 enum usb_interface_condition
{
83 USB_INTERFACE_UNBOUND
= 0,
84 USB_INTERFACE_BINDING
,
86 USB_INTERFACE_UNBINDING
,
90 * struct usb_interface - what usb device drivers talk to
91 * @altsetting: array of interface structures, one for each alternate
92 * setting that may be selected. Each one includes a set of
93 * endpoint configurations. They will be in no particular order.
94 * @num_altsetting: number of altsettings defined.
95 * @cur_altsetting: the current altsetting.
96 * @driver: the USB driver that is bound to this interface.
97 * @minor: the minor number assigned to this interface, if this
98 * interface is bound to a driver that uses the USB major number.
99 * If this interface does not use the USB major, this field should
100 * be unused. The driver should set this value in the probe()
101 * function of the driver, after it has been assigned a minor
102 * number from the USB core by calling usb_register_dev().
103 * @condition: binding state of the interface: not bound, binding
104 * (in probe()), bound to a driver, or unbinding (in disconnect())
105 * @dev: driver model's view of this device
106 * @class_dev: driver model's class view of this device.
108 * USB device drivers attach to interfaces on a physical device. Each
109 * interface encapsulates a single high level function, such as feeding
110 * an audio stream to a speaker or reporting a change in a volume control.
111 * Many USB devices only have one interface. The protocol used to talk to
112 * an interface's endpoints can be defined in a usb "class" specification,
113 * or by a product's vendor. The (default) control endpoint is part of
114 * every interface, but is never listed among the interface's descriptors.
116 * The driver that is bound to the interface can use standard driver model
117 * calls such as dev_get_drvdata() on the dev member of this structure.
119 * Each interface may have alternate settings. The initial configuration
120 * of a device sets altsetting 0, but the device driver can change
121 * that setting using usb_set_interface(). Alternate settings are often
122 * used to control the the use of periodic endpoints, such as by having
123 * different endpoints use different amounts of reserved USB bandwidth.
124 * All standards-conformant USB devices that use isochronous endpoints
125 * will use them in non-default settings.
127 * The USB specification says that alternate setting numbers must run from
128 * 0 to one less than the total number of alternate settings. But some
129 * devices manage to mess this up, and the structures aren't necessarily
130 * stored in numerical order anyhow. Use usb_altnum_to_altsetting() to
131 * look up an alternate setting in the altsetting array based on its number.
133 struct usb_interface
{
134 /* array of alternate settings for this interface,
135 * stored in no particular order */
136 struct usb_host_interface
*altsetting
;
138 struct usb_host_interface
*cur_altsetting
; /* the currently
139 * active alternate setting */
140 unsigned num_altsetting
; /* number of alternate settings */
142 int minor
; /* minor number this interface is
144 enum usb_interface_condition condition
; /* state of binding */
145 struct device dev
; /* interface specific device info */
146 struct class_device
*class_dev
;
148 #define to_usb_interface(d) container_of(d, struct usb_interface, dev)
149 #define interface_to_usbdev(intf) \
150 container_of(intf->dev.parent, struct usb_device, dev)
152 static inline void *usb_get_intfdata (struct usb_interface
*intf
)
154 return dev_get_drvdata (&intf
->dev
);
157 static inline void usb_set_intfdata (struct usb_interface
*intf
, void *data
)
159 dev_set_drvdata(&intf
->dev
, data
);
162 struct usb_interface
*usb_get_intf(struct usb_interface
*intf
);
163 void usb_put_intf(struct usb_interface
*intf
);
165 /* this maximum is arbitrary */
166 #define USB_MAXINTERFACES 32
169 * struct usb_interface_cache - long-term representation of a device interface
170 * @num_altsetting: number of altsettings defined.
171 * @ref: reference counter.
172 * @altsetting: variable-length array of interface structures, one for
173 * each alternate setting that may be selected. Each one includes a
174 * set of endpoint configurations. They will be in no particular order.
176 * These structures persist for the lifetime of a usb_device, unlike
177 * struct usb_interface (which persists only as long as its configuration
178 * is installed). The altsetting arrays can be accessed through these
179 * structures at any time, permitting comparison of configurations and
180 * providing support for the /proc/bus/usb/devices pseudo-file.
182 struct usb_interface_cache
{
183 unsigned num_altsetting
; /* number of alternate settings */
184 struct kref ref
; /* reference counter */
186 /* variable-length array of alternate settings for this interface,
187 * stored in no particular order */
188 struct usb_host_interface altsetting
[0];
190 #define ref_to_usb_interface_cache(r) \
191 container_of(r, struct usb_interface_cache, ref)
192 #define altsetting_to_usb_interface_cache(a) \
193 container_of(a, struct usb_interface_cache, altsetting[0])
196 * struct usb_host_config - representation of a device's configuration
197 * @desc: the device's configuration descriptor.
198 * @string: pointer to the cached version of the iConfiguration string, if
199 * present for this configuration.
200 * @interface: array of pointers to usb_interface structures, one for each
201 * interface in the configuration. The number of interfaces is stored
202 * in desc.bNumInterfaces. These pointers are valid only while the
203 * the configuration is active.
204 * @intf_cache: array of pointers to usb_interface_cache structures, one
205 * for each interface in the configuration. These structures exist
206 * for the entire life of the device.
207 * @extra: pointer to buffer containing all extra descriptors associated
208 * with this configuration (those preceding the first interface
210 * @extralen: length of the extra descriptors buffer.
212 * USB devices may have multiple configurations, but only one can be active
213 * at any time. Each encapsulates a different operational environment;
214 * for example, a dual-speed device would have separate configurations for
215 * full-speed and high-speed operation. The number of configurations
216 * available is stored in the device descriptor as bNumConfigurations.
218 * A configuration can contain multiple interfaces. Each corresponds to
219 * a different function of the USB device, and all are available whenever
220 * the configuration is active. The USB standard says that interfaces
221 * are supposed to be numbered from 0 to desc.bNumInterfaces-1, but a lot
222 * of devices get this wrong. In addition, the interface array is not
223 * guaranteed to be sorted in numerical order. Use usb_ifnum_to_if() to
224 * look up an interface entry based on its number.
226 * Device drivers should not attempt to activate configurations. The choice
227 * of which configuration to install is a policy decision based on such
228 * considerations as available power, functionality provided, and the user's
229 * desires (expressed through userspace tools). However, drivers can call
230 * usb_reset_configuration() to reinitialize the current configuration and
231 * all its interfaces.
233 struct usb_host_config
{
234 struct usb_config_descriptor desc
;
236 char *string
; /* iConfiguration string, if present */
237 /* the interfaces associated with this configuration,
238 * stored in no particular order */
239 struct usb_interface
*interface
[USB_MAXINTERFACES
];
241 /* Interface information available even when this is not the
242 * active configuration */
243 struct usb_interface_cache
*intf_cache
[USB_MAXINTERFACES
];
245 unsigned char *extra
; /* Extra descriptors */
249 int __usb_get_extra_descriptor(char *buffer
, unsigned size
,
250 unsigned char type
, void **ptr
);
251 #define usb_get_extra_descriptor(ifpoint,type,ptr)\
252 __usb_get_extra_descriptor((ifpoint)->extra,(ifpoint)->extralen,\
255 /* ----------------------------------------------------------------------- */
257 struct usb_operations
;
259 /* USB device number allocation bitmap */
261 unsigned long devicemap
[128 / (8*sizeof(unsigned long))];
265 * Allocated per bus (tree of devices) we have:
268 struct device
*controller
; /* host/master side hardware */
269 int busnum
; /* Bus number (in order of reg) */
270 char *bus_name
; /* stable id (PCI slot_name etc) */
271 u8 otg_port
; /* 0, or number of OTG/HNP port */
272 unsigned is_b_host
:1; /* true during some HNP roleswitches */
273 unsigned b_hnp_enable
:1; /* OTG: did A-Host enable HNP? */
275 int devnum_next
; /* Next open device number in
276 * round-robin allocation */
278 struct usb_devmap devmap
; /* device address allocation map */
279 struct usb_operations
*op
; /* Operations (specific to the HC) */
280 struct usb_device
*root_hub
; /* Root hub */
281 struct list_head bus_list
; /* list of busses */
282 void *hcpriv
; /* Host Controller private data */
284 int bandwidth_allocated
; /* on this bus: how much of the time
285 * reserved for periodic (intr/iso)
286 * requests is used, on average?
287 * Units: microseconds/frame.
288 * Limits: Full/low speed reserve 90%,
289 * while high speed reserves 80%.
291 int bandwidth_int_reqs
; /* number of Interrupt requests */
292 int bandwidth_isoc_reqs
; /* number of Isoc. requests */
294 struct dentry
*usbfs_dentry
; /* usbfs dentry entry for the bus */
296 struct class_device
*class_dev
; /* class device for this bus */
297 struct kref kref
; /* reference counting for this bus */
298 void (*release
)(struct usb_bus
*bus
);
300 #if defined(CONFIG_USB_MON)
301 struct mon_bus
*mon_bus
; /* non-null when associated */
302 int monitored
; /* non-zero when monitored */
306 /* ----------------------------------------------------------------------- */
308 /* This is arbitrary.
309 * From USB 2.0 spec Table 11-13, offset 7, a hub can
310 * have up to 255 ports. The most yet reported is 10.
312 #define USB_MAXCHILDREN (16)
317 * struct usb_device - kernel's representation of a USB device
319 * FIXME: Write the kerneldoc!
321 * Usbcore drivers should not set usbdev->state directly. Instead use
322 * usb_set_device_state().
325 int devnum
; /* Address on USB bus */
326 char devpath
[16]; /* Use in messages: /port/port/... */
327 enum usb_device_state state
; /* configured, not attached, etc */
328 enum usb_device_speed speed
; /* high/full/low (or error) */
330 struct usb_tt
*tt
; /* low/full speed dev, highspeed hub */
331 int ttport
; /* device port on that tt hub */
333 unsigned int toggle
[2]; /* one bit for each endpoint
334 * ([0] = IN, [1] = OUT) */
336 struct usb_device
*parent
; /* our hub, unless we're the root */
337 struct usb_bus
*bus
; /* Bus we're part of */
338 struct usb_host_endpoint ep0
;
340 struct device dev
; /* Generic device interface */
342 struct usb_device_descriptor descriptor
;/* Descriptor */
343 struct usb_host_config
*config
; /* All of the configs */
345 struct usb_host_config
*actconfig
;/* the active configuration */
346 struct usb_host_endpoint
*ep_in
[16];
347 struct usb_host_endpoint
*ep_out
[16];
349 char **rawdescriptors
; /* Raw descriptors for each config */
351 unsigned short bus_mA
; /* Current available from the bus */
352 u8 portnum
; /* Parent port number (origin 1) */
354 int have_langid
; /* whether string_langid is valid */
355 int string_langid
; /* language ID for strings */
357 /* static strings from the device */
358 char *product
; /* iProduct string, if present */
359 char *manufacturer
; /* iManufacturer string, if present */
360 char *serial
; /* iSerialNumber string, if present */
362 struct list_head filelist
;
363 struct class_device
*class_dev
;
364 struct dentry
*usbfs_dentry
; /* usbfs dentry entry for the device */
367 * Child devices - these can be either new devices
368 * (if this is a hub device), or different instances
369 * of this same device.
371 * Each instance needs its own set of data structures.
374 int maxchild
; /* Number of ports if hub */
375 struct usb_device
*children
[USB_MAXCHILDREN
];
377 #define to_usb_device(d) container_of(d, struct usb_device, dev)
379 extern struct usb_device
*usb_get_dev(struct usb_device
*dev
);
380 extern void usb_put_dev(struct usb_device
*dev
);
382 /* USB device locking */
383 #define usb_lock_device(udev) down(&(udev)->dev.sem)
384 #define usb_unlock_device(udev) up(&(udev)->dev.sem)
385 #define usb_trylock_device(udev) down_trylock(&(udev)->dev.sem)
386 extern int usb_lock_device_for_reset(struct usb_device
*udev
,
387 struct usb_interface
*iface
);
389 /* USB port reset for device reinitialization */
390 extern int usb_reset_device(struct usb_device
*dev
);
391 extern int usb_reset_composite_device(struct usb_device
*dev
,
392 struct usb_interface
*iface
);
394 extern struct usb_device
*usb_find_device(u16 vendor_id
, u16 product_id
);
396 /*-------------------------------------------------------------------------*/
398 /* for drivers using iso endpoints */
399 extern int usb_get_current_frame_number (struct usb_device
*usb_dev
);
401 /* used these for multi-interface device registration */
402 extern int usb_driver_claim_interface(struct usb_driver
*driver
,
403 struct usb_interface
*iface
, void* priv
);
406 * usb_interface_claimed - returns true iff an interface is claimed
407 * @iface: the interface being checked
409 * Returns true (nonzero) iff the interface is claimed, else false (zero).
410 * Callers must own the driver model's usb bus readlock. So driver
411 * probe() entries don't need extra locking, but other call contexts
412 * may need to explicitly claim that lock.
415 static inline int usb_interface_claimed(struct usb_interface
*iface
) {
416 return (iface
->dev
.driver
!= NULL
);
419 extern void usb_driver_release_interface(struct usb_driver
*driver
,
420 struct usb_interface
*iface
);
421 const struct usb_device_id
*usb_match_id(struct usb_interface
*interface
,
422 const struct usb_device_id
*id
);
424 extern struct usb_interface
*usb_find_interface(struct usb_driver
*drv
,
426 extern struct usb_interface
*usb_ifnum_to_if(struct usb_device
*dev
,
428 extern struct usb_host_interface
*usb_altnum_to_altsetting(
429 struct usb_interface
*intf
, unsigned int altnum
);
433 * usb_make_path - returns stable device path in the usb tree
434 * @dev: the device whose path is being constructed
435 * @buf: where to put the string
436 * @size: how big is "buf"?
438 * Returns length of the string (> 0) or negative if size was too small.
440 * This identifier is intended to be "stable", reflecting physical paths in
441 * hardware such as physical bus addresses for host controllers or ports on
442 * USB hubs. That makes it stay the same until systems are physically
443 * reconfigured, by re-cabling a tree of USB devices or by moving USB host
444 * controllers. Adding and removing devices, including virtual root hubs
445 * in host controller driver modules, does not change these path identifers;
446 * neither does rebooting or re-enumerating. These are more useful identifiers
447 * than changeable ("unstable") ones like bus numbers or device addresses.
449 * With a partial exception for devices connected to USB 2.0 root hubs, these
450 * identifiers are also predictable. So long as the device tree isn't changed,
451 * plugging any USB device into a given hub port always gives it the same path.
452 * Because of the use of "companion" controllers, devices connected to ports on
453 * USB 2.0 root hubs (EHCI host controllers) will get one path ID if they are
454 * high speed, and a different one if they are full or low speed.
456 static inline int usb_make_path (struct usb_device
*dev
, char *buf
,
460 actual
= snprintf (buf
, size
, "usb-%s-%s", dev
->bus
->bus_name
,
462 return (actual
>= (int)size
) ? -1 : actual
;
465 /*-------------------------------------------------------------------------*/
467 #define USB_DEVICE_ID_MATCH_DEVICE \
468 (USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT)
469 #define USB_DEVICE_ID_MATCH_DEV_RANGE \
470 (USB_DEVICE_ID_MATCH_DEV_LO | USB_DEVICE_ID_MATCH_DEV_HI)
471 #define USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION \
472 (USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_DEV_RANGE)
473 #define USB_DEVICE_ID_MATCH_DEV_INFO \
474 (USB_DEVICE_ID_MATCH_DEV_CLASS | \
475 USB_DEVICE_ID_MATCH_DEV_SUBCLASS | \
476 USB_DEVICE_ID_MATCH_DEV_PROTOCOL)
477 #define USB_DEVICE_ID_MATCH_INT_INFO \
478 (USB_DEVICE_ID_MATCH_INT_CLASS | \
479 USB_DEVICE_ID_MATCH_INT_SUBCLASS | \
480 USB_DEVICE_ID_MATCH_INT_PROTOCOL)
483 * USB_DEVICE - macro used to describe a specific usb device
484 * @vend: the 16 bit USB Vendor ID
485 * @prod: the 16 bit USB Product ID
487 * This macro is used to create a struct usb_device_id that matches a
490 #define USB_DEVICE(vend,prod) \
491 .match_flags = USB_DEVICE_ID_MATCH_DEVICE, .idVendor = (vend), \
494 * USB_DEVICE_VER - macro used to describe a specific usb device with a
496 * @vend: the 16 bit USB Vendor ID
497 * @prod: the 16 bit USB Product ID
498 * @lo: the bcdDevice_lo value
499 * @hi: the bcdDevice_hi value
501 * This macro is used to create a struct usb_device_id that matches a
502 * specific device, with a version range.
504 #define USB_DEVICE_VER(vend,prod,lo,hi) \
505 .match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION, \
506 .idVendor = (vend), .idProduct = (prod), \
507 .bcdDevice_lo = (lo), .bcdDevice_hi = (hi)
510 * USB_DEVICE_INFO - macro used to describe a class of usb devices
511 * @cl: bDeviceClass value
512 * @sc: bDeviceSubClass value
513 * @pr: bDeviceProtocol value
515 * This macro is used to create a struct usb_device_id that matches a
516 * specific class of devices.
518 #define USB_DEVICE_INFO(cl,sc,pr) \
519 .match_flags = USB_DEVICE_ID_MATCH_DEV_INFO, .bDeviceClass = (cl), \
520 .bDeviceSubClass = (sc), .bDeviceProtocol = (pr)
523 * USB_INTERFACE_INFO - macro used to describe a class of usb interfaces
524 * @cl: bInterfaceClass value
525 * @sc: bInterfaceSubClass value
526 * @pr: bInterfaceProtocol value
528 * This macro is used to create a struct usb_device_id that matches a
529 * specific class of interfaces.
531 #define USB_INTERFACE_INFO(cl,sc,pr) \
532 .match_flags = USB_DEVICE_ID_MATCH_INT_INFO, .bInterfaceClass = (cl), \
533 .bInterfaceSubClass = (sc), .bInterfaceProtocol = (pr)
535 /* ----------------------------------------------------------------------- */
539 struct list_head list
;
543 * struct usbdrv_wrap - wrapper for driver-model structure
544 * @driver: The driver-model core driver structure.
545 * @for_devices: Non-zero for device drivers, 0 for interface drivers.
548 struct device_driver driver
;
553 * struct usb_driver - identifies USB interface driver to usbcore
554 * @name: The driver name should be unique among USB drivers,
555 * and should normally be the same as the module name.
556 * @probe: Called to see if the driver is willing to manage a particular
557 * interface on a device. If it is, probe returns zero and uses
558 * dev_set_drvdata() to associate driver-specific data with the
559 * interface. It may also use usb_set_interface() to specify the
560 * appropriate altsetting. If unwilling to manage the interface,
561 * return a negative errno value.
562 * @disconnect: Called when the interface is no longer accessible, usually
563 * because its device has been (or is being) disconnected or the
564 * driver module is being unloaded.
565 * @ioctl: Used for drivers that want to talk to userspace through
566 * the "usbfs" filesystem. This lets devices provide ways to
567 * expose information to user space regardless of where they
568 * do (or don't) show up otherwise in the filesystem.
569 * @suspend: Called when the device is going to be suspended by the system.
570 * @resume: Called when the device is being resumed by the system.
571 * @pre_reset: Called by usb_reset_composite_device() when the device
572 * is about to be reset.
573 * @post_reset: Called by usb_reset_composite_device() after the device
575 * @id_table: USB drivers use ID table to support hotplugging.
576 * Export this with MODULE_DEVICE_TABLE(usb,...). This must be set
577 * or your driver's probe function will never get called.
578 * @dynids: used internally to hold the list of dynamically added device
579 * ids for this driver.
580 * @drvwrap: Driver-model core structure wrapper.
581 * @no_dynamic_id: if set to 1, the USB core will not allow dynamic ids to be
582 * added to this driver by preventing the sysfs file from being created.
584 * USB interface drivers must provide a name, probe() and disconnect()
585 * methods, and an id_table. Other driver fields are optional.
587 * The id_table is used in hotplugging. It holds a set of descriptors,
588 * and specialized data may be associated with each entry. That table
589 * is used by both user and kernel mode hotplugging support.
591 * The probe() and disconnect() methods are called in a context where
592 * they can sleep, but they should avoid abusing the privilege. Most
593 * work to connect to a device should be done when the device is opened,
594 * and undone at the last close. The disconnect code needs to address
595 * concurrency issues with respect to open() and close() methods, as
596 * well as forcing all pending I/O requests to complete (by unlinking
597 * them as necessary, and blocking until the unlinks complete).
602 int (*probe
) (struct usb_interface
*intf
,
603 const struct usb_device_id
*id
);
605 void (*disconnect
) (struct usb_interface
*intf
);
607 int (*ioctl
) (struct usb_interface
*intf
, unsigned int code
,
610 int (*suspend
) (struct usb_interface
*intf
, pm_message_t message
);
611 int (*resume
) (struct usb_interface
*intf
);
613 void (*pre_reset
) (struct usb_interface
*intf
);
614 void (*post_reset
) (struct usb_interface
*intf
);
616 const struct usb_device_id
*id_table
;
618 struct usb_dynids dynids
;
619 struct usbdrv_wrap drvwrap
;
620 unsigned int no_dynamic_id
:1;
622 #define to_usb_driver(d) container_of(d, struct usb_driver, drvwrap.driver)
625 * struct usb_device_driver - identifies USB device driver to usbcore
626 * @name: The driver name should be unique among USB drivers,
627 * and should normally be the same as the module name.
628 * @probe: Called to see if the driver is willing to manage a particular
629 * device. If it is, probe returns zero and uses dev_set_drvdata()
630 * to associate driver-specific data with the device. If unwilling
631 * to manage the device, return a negative errno value.
632 * @disconnect: Called when the device is no longer accessible, usually
633 * because it has been (or is being) disconnected or the driver's
634 * module is being unloaded.
635 * @suspend: Called when the device is going to be suspended by the system.
636 * @resume: Called when the device is being resumed by the system.
637 * @drvwrap: Driver-model core structure wrapper.
639 * USB drivers must provide all the fields listed above except drvwrap.
641 struct usb_device_driver
{
644 int (*probe
) (struct usb_device
*udev
);
645 void (*disconnect
) (struct usb_device
*udev
);
647 int (*suspend
) (struct usb_device
*udev
, pm_message_t message
);
648 int (*resume
) (struct usb_device
*udev
);
649 struct usbdrv_wrap drvwrap
;
651 #define to_usb_device_driver(d) container_of(d, struct usb_device_driver, \
654 extern struct bus_type usb_bus_type
;
657 * struct usb_class_driver - identifies a USB driver that wants to use the USB major number
658 * @name: the usb class device name for this driver. Will show up in sysfs.
659 * @fops: pointer to the struct file_operations of this driver.
660 * @minor_base: the start of the minor range for this driver.
662 * This structure is used for the usb_register_dev() and
663 * usb_unregister_dev() functions, to consolidate a number of the
664 * parameters used for them.
666 struct usb_class_driver
{
668 const struct file_operations
*fops
;
673 * use these in module_init()/module_exit()
674 * and don't forget MODULE_DEVICE_TABLE(usb, ...)
676 extern int usb_register_driver(struct usb_driver
*, struct module
*);
677 static inline int usb_register(struct usb_driver
*driver
)
679 return usb_register_driver(driver
, THIS_MODULE
);
681 extern void usb_deregister(struct usb_driver
*);
683 extern int usb_register_device_driver(struct usb_device_driver
*,
685 extern void usb_deregister_device_driver(struct usb_device_driver
*);
687 extern int usb_register_dev(struct usb_interface
*intf
,
688 struct usb_class_driver
*class_driver
);
689 extern void usb_deregister_dev(struct usb_interface
*intf
,
690 struct usb_class_driver
*class_driver
);
692 extern int usb_disabled(void);
694 /* ----------------------------------------------------------------------- */
697 * URB support, for asynchronous request completions
701 * urb->transfer_flags:
703 #define URB_SHORT_NOT_OK 0x0001 /* report short reads as errors */
704 #define URB_ISO_ASAP 0x0002 /* iso-only, urb->start_frame
706 #define URB_NO_TRANSFER_DMA_MAP 0x0004 /* urb->transfer_dma valid on submit */
707 #define URB_NO_SETUP_DMA_MAP 0x0008 /* urb->setup_dma valid on submit */
708 #define URB_NO_FSBR 0x0020 /* UHCI-specific */
709 #define URB_ZERO_PACKET 0x0040 /* Finish bulk OUT with short packet */
710 #define URB_NO_INTERRUPT 0x0080 /* HINT: no non-error interrupt
713 struct usb_iso_packet_descriptor
{
715 unsigned int length
; /* expected length */
716 unsigned int actual_length
;
723 typedef void (*usb_complete_t
)(struct urb
*, struct pt_regs
*);
726 * struct urb - USB Request Block
727 * @urb_list: For use by current owner of the URB.
728 * @pipe: Holds endpoint number, direction, type, and more.
729 * Create these values with the eight macros available;
730 * usb_{snd,rcv}TYPEpipe(dev,endpoint), where the TYPE is "ctrl"
731 * (control), "bulk", "int" (interrupt), or "iso" (isochronous).
732 * For example usb_sndbulkpipe() or usb_rcvintpipe(). Endpoint
733 * numbers range from zero to fifteen. Note that "in" endpoint two
734 * is a different endpoint (and pipe) from "out" endpoint two.
735 * The current configuration controls the existence, type, and
736 * maximum packet size of any given endpoint.
737 * @dev: Identifies the USB device to perform the request.
738 * @status: This is read in non-iso completion functions to get the
739 * status of the particular request. ISO requests only use it
740 * to tell whether the URB was unlinked; detailed status for
741 * each frame is in the fields of the iso_frame-desc.
742 * @transfer_flags: A variety of flags may be used to affect how URB
743 * submission, unlinking, or operation are handled. Different
744 * kinds of URB can use different flags.
745 * @transfer_buffer: This identifies the buffer to (or from) which
746 * the I/O request will be performed (unless URB_NO_TRANSFER_DMA_MAP
747 * is set). This buffer must be suitable for DMA; allocate it with
748 * kmalloc() or equivalent. For transfers to "in" endpoints, contents
749 * of this buffer will be modified. This buffer is used for the data
750 * stage of control transfers.
751 * @transfer_dma: When transfer_flags includes URB_NO_TRANSFER_DMA_MAP,
752 * the device driver is saying that it provided this DMA address,
753 * which the host controller driver should use in preference to the
755 * @transfer_buffer_length: How big is transfer_buffer. The transfer may
756 * be broken up into chunks according to the current maximum packet
757 * size for the endpoint, which is a function of the configuration
758 * and is encoded in the pipe. When the length is zero, neither
759 * transfer_buffer nor transfer_dma is used.
760 * @actual_length: This is read in non-iso completion functions, and
761 * it tells how many bytes (out of transfer_buffer_length) were
762 * transferred. It will normally be the same as requested, unless
763 * either an error was reported or a short read was performed.
764 * The URB_SHORT_NOT_OK transfer flag may be used to make such
765 * short reads be reported as errors.
766 * @setup_packet: Only used for control transfers, this points to eight bytes
767 * of setup data. Control transfers always start by sending this data
768 * to the device. Then transfer_buffer is read or written, if needed.
769 * @setup_dma: For control transfers with URB_NO_SETUP_DMA_MAP set, the
770 * device driver has provided this DMA address for the setup packet.
771 * The host controller driver should use this in preference to
773 * @start_frame: Returns the initial frame for isochronous transfers.
774 * @number_of_packets: Lists the number of ISO transfer buffers.
775 * @interval: Specifies the polling interval for interrupt or isochronous
776 * transfers. The units are frames (milliseconds) for for full and low
777 * speed devices, and microframes (1/8 millisecond) for highspeed ones.
778 * @error_count: Returns the number of ISO transfers that reported errors.
779 * @context: For use in completion functions. This normally points to
780 * request-specific driver context.
781 * @complete: Completion handler. This URB is passed as the parameter to the
782 * completion function. The completion function may then do what
783 * it likes with the URB, including resubmitting or freeing it.
784 * @iso_frame_desc: Used to provide arrays of ISO transfer buffers and to
785 * collect the transfer status for each buffer.
787 * This structure identifies USB transfer requests. URBs must be allocated by
788 * calling usb_alloc_urb() and freed with a call to usb_free_urb().
789 * Initialization may be done using various usb_fill_*_urb() functions. URBs
790 * are submitted using usb_submit_urb(), and pending requests may be canceled
791 * using usb_unlink_urb() or usb_kill_urb().
793 * Data Transfer Buffers:
795 * Normally drivers provide I/O buffers allocated with kmalloc() or otherwise
796 * taken from the general page pool. That is provided by transfer_buffer
797 * (control requests also use setup_packet), and host controller drivers
798 * perform a dma mapping (and unmapping) for each buffer transferred. Those
799 * mapping operations can be expensive on some platforms (perhaps using a dma
800 * bounce buffer or talking to an IOMMU),
801 * although they're cheap on commodity x86 and ppc hardware.
803 * Alternatively, drivers may pass the URB_NO_xxx_DMA_MAP transfer flags,
804 * which tell the host controller driver that no such mapping is needed since
805 * the device driver is DMA-aware. For example, a device driver might
806 * allocate a DMA buffer with usb_buffer_alloc() or call usb_buffer_map().
807 * When these transfer flags are provided, host controller drivers will
808 * attempt to use the dma addresses found in the transfer_dma and/or
809 * setup_dma fields rather than determining a dma address themselves. (Note
810 * that transfer_buffer and setup_packet must still be set because not all
811 * host controllers use DMA, nor do virtual root hubs).
815 * All URBs submitted must initialize the dev, pipe, transfer_flags (may be
816 * zero), and complete fields. All URBs must also initialize
817 * transfer_buffer and transfer_buffer_length. They may provide the
818 * URB_SHORT_NOT_OK transfer flag, indicating that short reads are
819 * to be treated as errors; that flag is invalid for write requests.
822 * use the URB_ZERO_PACKET transfer flag, indicating that bulk OUT transfers
823 * should always terminate with a short packet, even if it means adding an
824 * extra zero length packet.
826 * Control URBs must provide a setup_packet. The setup_packet and
827 * transfer_buffer may each be mapped for DMA or not, independently of
828 * the other. The transfer_flags bits URB_NO_TRANSFER_DMA_MAP and
829 * URB_NO_SETUP_DMA_MAP indicate which buffers have already been mapped.
830 * URB_NO_SETUP_DMA_MAP is ignored for non-control URBs.
832 * Interrupt URBs must provide an interval, saying how often (in milliseconds
833 * or, for highspeed devices, 125 microsecond units)
834 * to poll for transfers. After the URB has been submitted, the interval
835 * field reflects how the transfer was actually scheduled.
836 * The polling interval may be more frequent than requested.
837 * For example, some controllers have a maximum interval of 32 milliseconds,
838 * while others support intervals of up to 1024 milliseconds.
839 * Isochronous URBs also have transfer intervals. (Note that for isochronous
840 * endpoints, as well as high speed interrupt endpoints, the encoding of
841 * the transfer interval in the endpoint descriptor is logarithmic.
842 * Device drivers must convert that value to linear units themselves.)
844 * Isochronous URBs normally use the URB_ISO_ASAP transfer flag, telling
845 * the host controller to schedule the transfer as soon as bandwidth
846 * utilization allows, and then set start_frame to reflect the actual frame
847 * selected during submission. Otherwise drivers must specify the start_frame
848 * and handle the case where the transfer can't begin then. However, drivers
849 * won't know how bandwidth is currently allocated, and while they can
850 * find the current frame using usb_get_current_frame_number () they can't
851 * know the range for that frame number. (Ranges for frame counter values
852 * are HC-specific, and can go from 256 to 65536 frames from "now".)
854 * Isochronous URBs have a different data transfer model, in part because
855 * the quality of service is only "best effort". Callers provide specially
856 * allocated URBs, with number_of_packets worth of iso_frame_desc structures
857 * at the end. Each such packet is an individual ISO transfer. Isochronous
858 * URBs are normally queued, submitted by drivers to arrange that
859 * transfers are at least double buffered, and then explicitly resubmitted
860 * in completion handlers, so
861 * that data (such as audio or video) streams at as constant a rate as the
862 * host controller scheduler can support.
864 * Completion Callbacks:
866 * The completion callback is made in_interrupt(), and one of the first
867 * things that a completion handler should do is check the status field.
868 * The status field is provided for all URBs. It is used to report
869 * unlinked URBs, and status for all non-ISO transfers. It should not
870 * be examined before the URB is returned to the completion handler.
872 * The context field is normally used to link URBs back to the relevant
873 * driver or request state.
875 * When the completion callback is invoked for non-isochronous URBs, the
876 * actual_length field tells how many bytes were transferred. This field
877 * is updated even when the URB terminated with an error or was unlinked.
879 * ISO transfer status is reported in the status and actual_length fields
880 * of the iso_frame_desc array, and the number of errors is reported in
881 * error_count. Completion callbacks for ISO transfers will normally
882 * (re)submit URBs to ensure a constant transfer rate.
884 * Note that even fields marked "public" should not be touched by the driver
885 * when the urb is owned by the hcd, that is, since the call to
886 * usb_submit_urb() till the entry into the completion routine.
890 /* private: usb core and host controller only fields in the urb */
891 struct kref kref
; /* reference count of the URB */
892 spinlock_t lock
; /* lock for the URB */
893 void *hcpriv
; /* private data for host controller */
894 int bandwidth
; /* bandwidth for INT/ISO request */
895 atomic_t use_count
; /* concurrent submissions counter */
896 u8 reject
; /* submissions will fail */
898 /* public: documented fields in the urb that can be used by drivers */
899 struct list_head urb_list
; /* list head for use by the urb's
901 struct usb_device
*dev
; /* (in) pointer to associated device */
902 unsigned int pipe
; /* (in) pipe information */
903 int status
; /* (return) non-ISO status */
904 unsigned int transfer_flags
; /* (in) URB_SHORT_NOT_OK | ...*/
905 void *transfer_buffer
; /* (in) associated data buffer */
906 dma_addr_t transfer_dma
; /* (in) dma addr for transfer_buffer */
907 int transfer_buffer_length
; /* (in) data buffer length */
908 int actual_length
; /* (return) actual transfer length */
909 unsigned char *setup_packet
; /* (in) setup packet (control only) */
910 dma_addr_t setup_dma
; /* (in) dma addr for setup_packet */
911 int start_frame
; /* (modify) start frame (ISO) */
912 int number_of_packets
; /* (in) number of ISO packets */
913 int interval
; /* (modify) transfer interval
915 int error_count
; /* (return) number of ISO errors */
916 void *context
; /* (in) context for completion */
917 usb_complete_t complete
; /* (in) completion routine */
918 struct usb_iso_packet_descriptor iso_frame_desc
[0];
922 /* ----------------------------------------------------------------------- */
925 * usb_fill_control_urb - initializes a control urb
926 * @urb: pointer to the urb to initialize.
927 * @dev: pointer to the struct usb_device for this urb.
928 * @pipe: the endpoint pipe
929 * @setup_packet: pointer to the setup_packet buffer
930 * @transfer_buffer: pointer to the transfer buffer
931 * @buffer_length: length of the transfer buffer
932 * @complete: pointer to the usb_complete_t function
933 * @context: what to set the urb context to.
935 * Initializes a control urb with the proper information needed to submit
938 static inline void usb_fill_control_urb (struct urb
*urb
,
939 struct usb_device
*dev
,
941 unsigned char *setup_packet
,
942 void *transfer_buffer
,
944 usb_complete_t complete
,
947 spin_lock_init(&urb
->lock
);
950 urb
->setup_packet
= setup_packet
;
951 urb
->transfer_buffer
= transfer_buffer
;
952 urb
->transfer_buffer_length
= buffer_length
;
953 urb
->complete
= complete
;
954 urb
->context
= context
;
958 * usb_fill_bulk_urb - macro to help initialize a bulk urb
959 * @urb: pointer to the urb to initialize.
960 * @dev: pointer to the struct usb_device for this urb.
961 * @pipe: the endpoint pipe
962 * @transfer_buffer: pointer to the transfer buffer
963 * @buffer_length: length of the transfer buffer
964 * @complete: pointer to the usb_complete_t function
965 * @context: what to set the urb context to.
967 * Initializes a bulk urb with the proper information needed to submit it
970 static inline void usb_fill_bulk_urb (struct urb
*urb
,
971 struct usb_device
*dev
,
973 void *transfer_buffer
,
975 usb_complete_t complete
,
978 spin_lock_init(&urb
->lock
);
981 urb
->transfer_buffer
= transfer_buffer
;
982 urb
->transfer_buffer_length
= buffer_length
;
983 urb
->complete
= complete
;
984 urb
->context
= context
;
988 * usb_fill_int_urb - macro to help initialize a interrupt urb
989 * @urb: pointer to the urb to initialize.
990 * @dev: pointer to the struct usb_device for this urb.
991 * @pipe: the endpoint pipe
992 * @transfer_buffer: pointer to the transfer buffer
993 * @buffer_length: length of the transfer buffer
994 * @complete: pointer to the usb_complete_t function
995 * @context: what to set the urb context to.
996 * @interval: what to set the urb interval to, encoded like
997 * the endpoint descriptor's bInterval value.
999 * Initializes a interrupt urb with the proper information needed to submit
1001 * Note that high speed interrupt endpoints use a logarithmic encoding of
1002 * the endpoint interval, and express polling intervals in microframes
1003 * (eight per millisecond) rather than in frames (one per millisecond).
1005 static inline void usb_fill_int_urb (struct urb
*urb
,
1006 struct usb_device
*dev
,
1008 void *transfer_buffer
,
1010 usb_complete_t complete
,
1014 spin_lock_init(&urb
->lock
);
1017 urb
->transfer_buffer
= transfer_buffer
;
1018 urb
->transfer_buffer_length
= buffer_length
;
1019 urb
->complete
= complete
;
1020 urb
->context
= context
;
1021 if (dev
->speed
== USB_SPEED_HIGH
)
1022 urb
->interval
= 1 << (interval
- 1);
1024 urb
->interval
= interval
;
1025 urb
->start_frame
= -1;
1028 extern void usb_init_urb(struct urb
*urb
);
1029 extern struct urb
*usb_alloc_urb(int iso_packets
, gfp_t mem_flags
);
1030 extern void usb_free_urb(struct urb
*urb
);
1031 #define usb_put_urb usb_free_urb
1032 extern struct urb
*usb_get_urb(struct urb
*urb
);
1033 extern int usb_submit_urb(struct urb
*urb
, gfp_t mem_flags
);
1034 extern int usb_unlink_urb(struct urb
*urb
);
1035 extern void usb_kill_urb(struct urb
*urb
);
1037 #define HAVE_USB_BUFFERS
1038 void *usb_buffer_alloc (struct usb_device
*dev
, size_t size
,
1039 gfp_t mem_flags
, dma_addr_t
*dma
);
1040 void usb_buffer_free (struct usb_device
*dev
, size_t size
,
1041 void *addr
, dma_addr_t dma
);
1044 struct urb
*usb_buffer_map (struct urb
*urb
);
1045 void usb_buffer_dmasync (struct urb
*urb
);
1046 void usb_buffer_unmap (struct urb
*urb
);
1050 int usb_buffer_map_sg (struct usb_device
*dev
, unsigned pipe
,
1051 struct scatterlist
*sg
, int nents
);
1053 void usb_buffer_dmasync_sg (struct usb_device
*dev
, unsigned pipe
,
1054 struct scatterlist
*sg
, int n_hw_ents
);
1056 void usb_buffer_unmap_sg (struct usb_device
*dev
, unsigned pipe
,
1057 struct scatterlist
*sg
, int n_hw_ents
);
1059 /*-------------------------------------------------------------------*
1060 * SYNCHRONOUS CALL SUPPORT *
1061 *-------------------------------------------------------------------*/
1063 extern int usb_control_msg(struct usb_device
*dev
, unsigned int pipe
,
1064 __u8 request
, __u8 requesttype
, __u16 value
, __u16 index
,
1065 void *data
, __u16 size
, int timeout
);
1066 extern int usb_interrupt_msg(struct usb_device
*usb_dev
, unsigned int pipe
,
1067 void *data
, int len
, int *actual_length
, int timeout
);
1068 extern int usb_bulk_msg(struct usb_device
*usb_dev
, unsigned int pipe
,
1069 void *data
, int len
, int *actual_length
,
1072 /* wrappers around usb_control_msg() for the most common standard requests */
1073 extern int usb_get_descriptor(struct usb_device
*dev
, unsigned char desctype
,
1074 unsigned char descindex
, void *buf
, int size
);
1075 extern int usb_get_status(struct usb_device
*dev
,
1076 int type
, int target
, void *data
);
1077 extern int usb_string(struct usb_device
*dev
, int index
,
1078 char *buf
, size_t size
);
1080 /* wrappers that also update important state inside usbcore */
1081 extern int usb_clear_halt(struct usb_device
*dev
, int pipe
);
1082 extern int usb_reset_configuration(struct usb_device
*dev
);
1083 extern int usb_set_interface(struct usb_device
*dev
, int ifnum
, int alternate
);
1086 * timeouts, in milliseconds, used for sending/receiving control messages
1087 * they typically complete within a few frames (msec) after they're issued
1088 * USB identifies 5 second timeouts, maybe more in a few cases, and a few
1089 * slow devices (like some MGE Ellipse UPSes) actually push that limit.
1091 #define USB_CTRL_GET_TIMEOUT 5000
1092 #define USB_CTRL_SET_TIMEOUT 5000
1096 * struct usb_sg_request - support for scatter/gather I/O
1097 * @status: zero indicates success, else negative errno
1098 * @bytes: counts bytes transferred.
1100 * These requests are initialized using usb_sg_init(), and then are used
1101 * as request handles passed to usb_sg_wait() or usb_sg_cancel(). Most
1102 * members of the request object aren't for driver access.
1104 * The status and bytecount values are valid only after usb_sg_wait()
1105 * returns. If the status is zero, then the bytecount matches the total
1108 * After an error completion, drivers may need to clear a halt condition
1111 struct usb_sg_request
{
1116 * members below are private: to usbcore,
1117 * and are not provided for driver access!
1121 struct usb_device
*dev
;
1123 struct scatterlist
*sg
;
1130 struct completion complete
;
1134 struct usb_sg_request
*io
,
1135 struct usb_device
*dev
,
1138 struct scatterlist
*sg
,
1143 void usb_sg_cancel (struct usb_sg_request
*io
);
1144 void usb_sg_wait (struct usb_sg_request
*io
);
1147 /* ----------------------------------------------------------------------- */
1150 * For various legacy reasons, Linux has a small cookie that's paired with
1151 * a struct usb_device to identify an endpoint queue. Queue characteristics
1152 * are defined by the endpoint's descriptor. This cookie is called a "pipe",
1153 * an unsigned int encoded as:
1155 * - direction: bit 7 (0 = Host-to-Device [Out],
1156 * 1 = Device-to-Host [In] ...
1157 * like endpoint bEndpointAddress)
1158 * - device address: bits 8-14 ... bit positions known to uhci-hcd
1159 * - endpoint: bits 15-18 ... bit positions known to uhci-hcd
1160 * - pipe type: bits 30-31 (00 = isochronous, 01 = interrupt,
1161 * 10 = control, 11 = bulk)
1163 * Given the device address and endpoint descriptor, pipes are redundant.
1166 /* NOTE: these are not the standard USB_ENDPOINT_XFER_* values!! */
1167 /* (yet ... they're the values used by usbfs) */
1168 #define PIPE_ISOCHRONOUS 0
1169 #define PIPE_INTERRUPT 1
1170 #define PIPE_CONTROL 2
1173 #define usb_pipein(pipe) ((pipe) & USB_DIR_IN)
1174 #define usb_pipeout(pipe) (!usb_pipein(pipe))
1176 #define usb_pipedevice(pipe) (((pipe) >> 8) & 0x7f)
1177 #define usb_pipeendpoint(pipe) (((pipe) >> 15) & 0xf)
1179 #define usb_pipetype(pipe) (((pipe) >> 30) & 3)
1180 #define usb_pipeisoc(pipe) (usb_pipetype((pipe)) == PIPE_ISOCHRONOUS)
1181 #define usb_pipeint(pipe) (usb_pipetype((pipe)) == PIPE_INTERRUPT)
1182 #define usb_pipecontrol(pipe) (usb_pipetype((pipe)) == PIPE_CONTROL)
1183 #define usb_pipebulk(pipe) (usb_pipetype((pipe)) == PIPE_BULK)
1185 /* The D0/D1 toggle bits ... USE WITH CAUTION (they're almost hcd-internal) */
1186 #define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> (ep)) & 1)
1187 #define usb_dotoggle(dev, ep, out) ((dev)->toggle[out] ^= (1 << (ep)))
1188 #define usb_settoggle(dev, ep, out, bit) \
1189 ((dev)->toggle[out] = ((dev)->toggle[out] & ~(1 << (ep))) | \
1193 static inline unsigned int __create_pipe(struct usb_device
*dev
,
1194 unsigned int endpoint
)
1196 return (dev
->devnum
<< 8) | (endpoint
<< 15);
1199 /* Create various pipes... */
1200 #define usb_sndctrlpipe(dev,endpoint) \
1201 ((PIPE_CONTROL << 30) | __create_pipe(dev,endpoint))
1202 #define usb_rcvctrlpipe(dev,endpoint) \
1203 ((PIPE_CONTROL << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN)
1204 #define usb_sndisocpipe(dev,endpoint) \
1205 ((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev,endpoint))
1206 #define usb_rcvisocpipe(dev,endpoint) \
1207 ((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN)
1208 #define usb_sndbulkpipe(dev,endpoint) \
1209 ((PIPE_BULK << 30) | __create_pipe(dev,endpoint))
1210 #define usb_rcvbulkpipe(dev,endpoint) \
1211 ((PIPE_BULK << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN)
1212 #define usb_sndintpipe(dev,endpoint) \
1213 ((PIPE_INTERRUPT << 30) | __create_pipe(dev,endpoint))
1214 #define usb_rcvintpipe(dev,endpoint) \
1215 ((PIPE_INTERRUPT << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN)
1217 /*-------------------------------------------------------------------------*/
1220 usb_maxpacket(struct usb_device
*udev
, int pipe
, int is_out
)
1222 struct usb_host_endpoint
*ep
;
1223 unsigned epnum
= usb_pipeendpoint(pipe
);
1226 WARN_ON(usb_pipein(pipe
));
1227 ep
= udev
->ep_out
[epnum
];
1229 WARN_ON(usb_pipeout(pipe
));
1230 ep
= udev
->ep_in
[epnum
];
1235 /* NOTE: only 0x07ff bits are for packet size... */
1236 return le16_to_cpu(ep
->desc
.wMaxPacketSize
);
1239 /* ----------------------------------------------------------------------- */
1241 /* Events from the usb core */
1242 #define USB_DEVICE_ADD 0x0001
1243 #define USB_DEVICE_REMOVE 0x0002
1244 #define USB_BUS_ADD 0x0003
1245 #define USB_BUS_REMOVE 0x0004
1246 extern void usb_register_notify(struct notifier_block
*nb
);
1247 extern void usb_unregister_notify(struct notifier_block
*nb
);
1250 #define dbg(format, arg...) printk(KERN_DEBUG "%s: " format "\n" , \
1253 #define dbg(format, arg...) do {} while (0)
1256 #define err(format, arg...) printk(KERN_ERR "%s: " format "\n" , \
1258 #define info(format, arg...) printk(KERN_INFO "%s: " format "\n" , \
1260 #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n" , \
1264 #endif /* __KERNEL__ */