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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef __LINUX_USB_H
2#define __LINUX_USB_H
3
4#include <linux/mod_devicetable.h>
5#include <linux/usb_ch9.h>
6
7#define USB_MAJOR 180
Kay Sieversfbf82fd2005-07-31 01:05:53 +02008#define USB_DEVICE_MAJOR 189
Linus Torvalds1da177e2005-04-16 15:20:36 -07009
10
11#ifdef __KERNEL__
12
Linus Torvalds1da177e2005-04-16 15:20:36 -070013#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 */
22
23struct usb_device;
24struct usb_driver;
25
26/*-------------------------------------------------------------------------*/
27
28/*
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:
32 *
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.
37 *
38 * And there might be other descriptors mixed in with those.
39 *
40 * Devices may also have class-specific or vendor-specific descriptors.
41 */
42
Greg Kroah-Hartman9bde7492006-06-14 12:14:34 -070043struct ep_device;
44
Linus Torvalds1da177e2005-04-16 15:20:36 -070045/**
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
Randy Dunlap7fac9a32006-06-22 15:12:41 -070051 * @ep_dev: ep_device for sysfs info
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 * @extra: descriptors following this endpoint in the configuration
53 * @extralen: how many bytes of "extra" are valid
54 *
55 * USB requests are always queued to a given endpoint, identified by a
56 * descriptor within an active interface in a given USB configuration.
57 */
58struct usb_host_endpoint {
59 struct usb_endpoint_descriptor desc;
60 struct list_head urb_list;
61 void *hcpriv;
Greg Kroah-Hartman9bde7492006-06-14 12:14:34 -070062 struct ep_device *ep_dev; /* For sysfs info */
Linus Torvalds1da177e2005-04-16 15:20:36 -070063
64 unsigned char *extra; /* Extra descriptors */
65 int extralen;
66};
67
68/* host-side wrapper for one interface setting's parsed descriptors */
69struct usb_host_interface {
70 struct usb_interface_descriptor desc;
71
72 /* array of desc.bNumEndpoint endpoints associated with this
73 * interface setting. these will be in no particular order.
74 */
75 struct usb_host_endpoint *endpoint;
76
77 char *string; /* iInterface string, if present */
78 unsigned char *extra; /* Extra descriptors */
79 int extralen;
80};
81
82enum usb_interface_condition {
83 USB_INTERFACE_UNBOUND = 0,
84 USB_INTERFACE_BINDING,
85 USB_INTERFACE_BOUND,
86 USB_INTERFACE_UNBINDING,
87};
88
89/**
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
Greg Kroah-Hartmanbd009492006-06-20 13:09:50 -0700106 * @usb_dev: if an interface is bound to the USB major, this will point
107 * to the sysfs representation for that device.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 *
109 * USB device drivers attach to interfaces on a physical device. Each
110 * interface encapsulates a single high level function, such as feeding
111 * an audio stream to a speaker or reporting a change in a volume control.
112 * Many USB devices only have one interface. The protocol used to talk to
113 * an interface's endpoints can be defined in a usb "class" specification,
114 * or by a product's vendor. The (default) control endpoint is part of
115 * every interface, but is never listed among the interface's descriptors.
116 *
117 * The driver that is bound to the interface can use standard driver model
118 * calls such as dev_get_drvdata() on the dev member of this structure.
119 *
120 * Each interface may have alternate settings. The initial configuration
121 * of a device sets altsetting 0, but the device driver can change
122 * that setting using usb_set_interface(). Alternate settings are often
123 * used to control the the use of periodic endpoints, such as by having
124 * different endpoints use different amounts of reserved USB bandwidth.
125 * All standards-conformant USB devices that use isochronous endpoints
126 * will use them in non-default settings.
127 *
128 * The USB specification says that alternate setting numbers must run from
129 * 0 to one less than the total number of alternate settings. But some
130 * devices manage to mess this up, and the structures aren't necessarily
131 * stored in numerical order anyhow. Use usb_altnum_to_altsetting() to
132 * look up an alternate setting in the altsetting array based on its number.
133 */
134struct usb_interface {
135 /* array of alternate settings for this interface,
136 * stored in no particular order */
137 struct usb_host_interface *altsetting;
138
139 struct usb_host_interface *cur_altsetting; /* the currently
140 * active alternate setting */
141 unsigned num_altsetting; /* number of alternate settings */
142
Alan Sternb724ae72005-10-24 15:36:00 -0400143 int minor; /* minor number this interface is
144 * bound to */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 enum usb_interface_condition condition; /* state of binding */
146 struct device dev; /* interface specific device info */
Greg Kroah-Hartmanbd009492006-06-20 13:09:50 -0700147 struct device *usb_dev; /* pointer to the usb class's device, if any */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148};
149#define to_usb_interface(d) container_of(d, struct usb_interface, dev)
150#define interface_to_usbdev(intf) \
151 container_of(intf->dev.parent, struct usb_device, dev)
152
153static inline void *usb_get_intfdata (struct usb_interface *intf)
154{
155 return dev_get_drvdata (&intf->dev);
156}
157
158static inline void usb_set_intfdata (struct usb_interface *intf, void *data)
159{
160 dev_set_drvdata(&intf->dev, data);
161}
162
163struct usb_interface *usb_get_intf(struct usb_interface *intf);
164void usb_put_intf(struct usb_interface *intf);
165
166/* this maximum is arbitrary */
167#define USB_MAXINTERFACES 32
168
169/**
170 * struct usb_interface_cache - long-term representation of a device interface
171 * @num_altsetting: number of altsettings defined.
172 * @ref: reference counter.
173 * @altsetting: variable-length array of interface structures, one for
174 * each alternate setting that may be selected. Each one includes a
175 * set of endpoint configurations. They will be in no particular order.
176 *
177 * These structures persist for the lifetime of a usb_device, unlike
178 * struct usb_interface (which persists only as long as its configuration
179 * is installed). The altsetting arrays can be accessed through these
180 * structures at any time, permitting comparison of configurations and
181 * providing support for the /proc/bus/usb/devices pseudo-file.
182 */
183struct usb_interface_cache {
184 unsigned num_altsetting; /* number of alternate settings */
185 struct kref ref; /* reference counter */
186
187 /* variable-length array of alternate settings for this interface,
188 * stored in no particular order */
189 struct usb_host_interface altsetting[0];
190};
191#define ref_to_usb_interface_cache(r) \
192 container_of(r, struct usb_interface_cache, ref)
193#define altsetting_to_usb_interface_cache(a) \
194 container_of(a, struct usb_interface_cache, altsetting[0])
195
196/**
197 * struct usb_host_config - representation of a device's configuration
198 * @desc: the device's configuration descriptor.
199 * @string: pointer to the cached version of the iConfiguration string, if
200 * present for this configuration.
201 * @interface: array of pointers to usb_interface structures, one for each
202 * interface in the configuration. The number of interfaces is stored
203 * in desc.bNumInterfaces. These pointers are valid only while the
204 * the configuration is active.
205 * @intf_cache: array of pointers to usb_interface_cache structures, one
206 * for each interface in the configuration. These structures exist
207 * for the entire life of the device.
208 * @extra: pointer to buffer containing all extra descriptors associated
209 * with this configuration (those preceding the first interface
210 * descriptor).
211 * @extralen: length of the extra descriptors buffer.
212 *
213 * USB devices may have multiple configurations, but only one can be active
214 * at any time. Each encapsulates a different operational environment;
215 * for example, a dual-speed device would have separate configurations for
216 * full-speed and high-speed operation. The number of configurations
217 * available is stored in the device descriptor as bNumConfigurations.
218 *
219 * A configuration can contain multiple interfaces. Each corresponds to
220 * a different function of the USB device, and all are available whenever
221 * the configuration is active. The USB standard says that interfaces
222 * are supposed to be numbered from 0 to desc.bNumInterfaces-1, but a lot
223 * of devices get this wrong. In addition, the interface array is not
224 * guaranteed to be sorted in numerical order. Use usb_ifnum_to_if() to
225 * look up an interface entry based on its number.
226 *
227 * Device drivers should not attempt to activate configurations. The choice
228 * of which configuration to install is a policy decision based on such
229 * considerations as available power, functionality provided, and the user's
Kay Sievers312c0042005-11-16 09:00:00 +0100230 * desires (expressed through userspace tools). However, drivers can call
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 * usb_reset_configuration() to reinitialize the current configuration and
232 * all its interfaces.
233 */
234struct usb_host_config {
235 struct usb_config_descriptor desc;
236
Alan Stern4f62efe2005-10-24 16:24:14 -0400237 char *string; /* iConfiguration string, if present */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238 /* the interfaces associated with this configuration,
239 * stored in no particular order */
240 struct usb_interface *interface[USB_MAXINTERFACES];
241
242 /* Interface information available even when this is not the
243 * active configuration */
244 struct usb_interface_cache *intf_cache[USB_MAXINTERFACES];
245
246 unsigned char *extra; /* Extra descriptors */
247 int extralen;
248};
249
250int __usb_get_extra_descriptor(char *buffer, unsigned size,
251 unsigned char type, void **ptr);
252#define usb_get_extra_descriptor(ifpoint,type,ptr)\
253 __usb_get_extra_descriptor((ifpoint)->extra,(ifpoint)->extralen,\
254 type,(void**)ptr)
255
Alan Sternb724ae72005-10-24 15:36:00 -0400256/* ----------------------------------------------------------------------- */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257
258struct usb_operations;
259
260/* USB device number allocation bitmap */
261struct usb_devmap {
262 unsigned long devicemap[128 / (8*sizeof(unsigned long))];
263};
264
265/*
266 * Allocated per bus (tree of devices) we have:
267 */
268struct usb_bus {
269 struct device *controller; /* host/master side hardware */
270 int busnum; /* Bus number (in order of reg) */
271 char *bus_name; /* stable id (PCI slot_name etc) */
272 u8 otg_port; /* 0, or number of OTG/HNP port */
273 unsigned is_b_host:1; /* true during some HNP roleswitches */
274 unsigned b_hnp_enable:1; /* OTG: did A-Host enable HNP? */
275
Alan Sternb724ae72005-10-24 15:36:00 -0400276 int devnum_next; /* Next open device number in
277 * round-robin allocation */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
279 struct usb_devmap devmap; /* device address allocation map */
280 struct usb_operations *op; /* Operations (specific to the HC) */
281 struct usb_device *root_hub; /* Root hub */
282 struct list_head bus_list; /* list of busses */
283 void *hcpriv; /* Host Controller private data */
284
285 int bandwidth_allocated; /* on this bus: how much of the time
286 * reserved for periodic (intr/iso)
287 * requests is used, on average?
288 * Units: microseconds/frame.
289 * Limits: Full/low speed reserve 90%,
290 * while high speed reserves 80%.
291 */
292 int bandwidth_int_reqs; /* number of Interrupt requests */
293 int bandwidth_isoc_reqs; /* number of Isoc. requests */
294
295 struct dentry *usbfs_dentry; /* usbfs dentry entry for the bus */
296
gregkh@suse.de8561b102005-03-15 15:10:13 -0800297 struct class_device *class_dev; /* class device for this bus */
Alan Sternb724ae72005-10-24 15:36:00 -0400298 struct kref kref; /* reference counting for this bus */
299 void (*release)(struct usb_bus *bus);
300
Adrian Bunk4749f322005-06-23 11:36:56 +0200301#if defined(CONFIG_USB_MON)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 struct mon_bus *mon_bus; /* non-null when associated */
303 int monitored; /* non-zero when monitored */
304#endif
305};
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306
Alan Sternb724ae72005-10-24 15:36:00 -0400307/* ----------------------------------------------------------------------- */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
309/* This is arbitrary.
310 * From USB 2.0 spec Table 11-13, offset 7, a hub can
311 * have up to 255 ports. The most yet reported is 10.
312 */
313#define USB_MAXCHILDREN (16)
314
315struct usb_tt;
316
317/*
318 * struct usb_device - kernel's representation of a USB device
319 *
320 * FIXME: Write the kerneldoc!
321 *
322 * Usbcore drivers should not set usbdev->state directly. Instead use
323 * usb_set_device_state().
324 */
325struct usb_device {
326 int devnum; /* Address on USB bus */
327 char devpath [16]; /* Use in messages: /port/port/... */
328 enum usb_device_state state; /* configured, not attached, etc */
329 enum usb_device_speed speed; /* high/full/low (or error) */
330
331 struct usb_tt *tt; /* low/full speed dev, highspeed hub */
332 int ttport; /* device port on that tt hub */
333
Alan Sternb724ae72005-10-24 15:36:00 -0400334 unsigned int toggle[2]; /* one bit for each endpoint
335 * ([0] = IN, [1] = OUT) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
337 struct usb_device *parent; /* our hub, unless we're the root */
338 struct usb_bus *bus; /* Bus we're part of */
339 struct usb_host_endpoint ep0;
340
341 struct device dev; /* Generic device interface */
342
343 struct usb_device_descriptor descriptor;/* Descriptor */
344 struct usb_host_config *config; /* All of the configs */
345
346 struct usb_host_config *actconfig;/* the active configuration */
347 struct usb_host_endpoint *ep_in[16];
348 struct usb_host_endpoint *ep_out[16];
349
350 char **rawdescriptors; /* Raw descriptors for each config */
351
Alan Stern55c52712005-11-23 12:03:12 -0500352 unsigned short bus_mA; /* Current available from the bus */
Alan Stern12c3da32005-11-23 12:09:52 -0500353 u8 portnum; /* Parent port number (origin 1) */
Alan Stern55c52712005-11-23 12:03:12 -0500354
Alan Sternb724ae72005-10-24 15:36:00 -0400355 int have_langid; /* whether string_langid is valid */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 int string_langid; /* language ID for strings */
357
Alan Stern4f62efe2005-10-24 16:24:14 -0400358 /* static strings from the device */
359 char *product; /* iProduct string, if present */
360 char *manufacturer; /* iManufacturer string, if present */
361 char *serial; /* iSerialNumber string, if present */
362
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 struct list_head filelist;
Greg Kroah-Hartmanc1822742006-06-19 23:59:31 -0700364 struct device *usbfs_dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 struct dentry *usbfs_dentry; /* usbfs dentry entry for the device */
366
367 /*
368 * Child devices - these can be either new devices
369 * (if this is a hub device), or different instances
370 * of this same device.
371 *
372 * Each instance needs its own set of data structures.
373 */
374
375 int maxchild; /* Number of ports if hub */
376 struct usb_device *children[USB_MAXCHILDREN];
377};
378#define to_usb_device(d) container_of(d, struct usb_device, dev)
379
380extern struct usb_device *usb_get_dev(struct usb_device *dev);
381extern void usb_put_dev(struct usb_device *dev);
382
Alan Stern9ad3d6c2005-11-17 17:10:32 -0500383/* USB device locking */
384#define usb_lock_device(udev) down(&(udev)->dev.sem)
385#define usb_unlock_device(udev) up(&(udev)->dev.sem)
386#define usb_trylock_device(udev) down_trylock(&(udev)->dev.sem)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387extern int usb_lock_device_for_reset(struct usb_device *udev,
388 struct usb_interface *iface);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389
390/* USB port reset for device reinitialization */
391extern int usb_reset_device(struct usb_device *dev);
Alan Stern79efa092006-06-01 13:33:42 -0400392extern int usb_reset_composite_device(struct usb_device *dev,
393 struct usb_interface *iface);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
395extern struct usb_device *usb_find_device(u16 vendor_id, u16 product_id);
396
397/*-------------------------------------------------------------------------*/
398
399/* for drivers using iso endpoints */
400extern int usb_get_current_frame_number (struct usb_device *usb_dev);
401
402/* used these for multi-interface device registration */
403extern int usb_driver_claim_interface(struct usb_driver *driver,
404 struct usb_interface *iface, void* priv);
405
406/**
407 * usb_interface_claimed - returns true iff an interface is claimed
408 * @iface: the interface being checked
409 *
410 * Returns true (nonzero) iff the interface is claimed, else false (zero).
411 * Callers must own the driver model's usb bus readlock. So driver
412 * probe() entries don't need extra locking, but other call contexts
413 * may need to explicitly claim that lock.
414 *
415 */
416static inline int usb_interface_claimed(struct usb_interface *iface) {
417 return (iface->dev.driver != NULL);
418}
419
420extern void usb_driver_release_interface(struct usb_driver *driver,
421 struct usb_interface *iface);
422const struct usb_device_id *usb_match_id(struct usb_interface *interface,
423 const struct usb_device_id *id);
424
425extern struct usb_interface *usb_find_interface(struct usb_driver *drv,
426 int minor);
427extern struct usb_interface *usb_ifnum_to_if(struct usb_device *dev,
428 unsigned ifnum);
429extern struct usb_host_interface *usb_altnum_to_altsetting(
430 struct usb_interface *intf, unsigned int altnum);
431
432
433/**
434 * usb_make_path - returns stable device path in the usb tree
435 * @dev: the device whose path is being constructed
436 * @buf: where to put the string
437 * @size: how big is "buf"?
438 *
439 * Returns length of the string (> 0) or negative if size was too small.
440 *
441 * This identifier is intended to be "stable", reflecting physical paths in
442 * hardware such as physical bus addresses for host controllers or ports on
443 * USB hubs. That makes it stay the same until systems are physically
444 * reconfigured, by re-cabling a tree of USB devices or by moving USB host
445 * controllers. Adding and removing devices, including virtual root hubs
446 * in host controller driver modules, does not change these path identifers;
447 * neither does rebooting or re-enumerating. These are more useful identifiers
448 * than changeable ("unstable") ones like bus numbers or device addresses.
449 *
450 * With a partial exception for devices connected to USB 2.0 root hubs, these
451 * identifiers are also predictable. So long as the device tree isn't changed,
452 * plugging any USB device into a given hub port always gives it the same path.
453 * Because of the use of "companion" controllers, devices connected to ports on
454 * USB 2.0 root hubs (EHCI host controllers) will get one path ID if they are
455 * high speed, and a different one if they are full or low speed.
456 */
Alan Sternb724ae72005-10-24 15:36:00 -0400457static inline int usb_make_path (struct usb_device *dev, char *buf,
458 size_t size)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459{
460 int actual;
Alan Sternb724ae72005-10-24 15:36:00 -0400461 actual = snprintf (buf, size, "usb-%s-%s", dev->bus->bus_name,
462 dev->devpath);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 return (actual >= (int)size) ? -1 : actual;
464}
465
466/*-------------------------------------------------------------------------*/
467
Alan Sternb724ae72005-10-24 15:36:00 -0400468#define USB_DEVICE_ID_MATCH_DEVICE \
469 (USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT)
470#define USB_DEVICE_ID_MATCH_DEV_RANGE \
471 (USB_DEVICE_ID_MATCH_DEV_LO | USB_DEVICE_ID_MATCH_DEV_HI)
472#define USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION \
473 (USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_DEV_RANGE)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474#define USB_DEVICE_ID_MATCH_DEV_INFO \
Alan Sternb724ae72005-10-24 15:36:00 -0400475 (USB_DEVICE_ID_MATCH_DEV_CLASS | \
476 USB_DEVICE_ID_MATCH_DEV_SUBCLASS | \
477 USB_DEVICE_ID_MATCH_DEV_PROTOCOL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478#define USB_DEVICE_ID_MATCH_INT_INFO \
Alan Sternb724ae72005-10-24 15:36:00 -0400479 (USB_DEVICE_ID_MATCH_INT_CLASS | \
480 USB_DEVICE_ID_MATCH_INT_SUBCLASS | \
481 USB_DEVICE_ID_MATCH_INT_PROTOCOL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483/**
484 * USB_DEVICE - macro used to describe a specific usb device
485 * @vend: the 16 bit USB Vendor ID
486 * @prod: the 16 bit USB Product ID
487 *
488 * This macro is used to create a struct usb_device_id that matches a
489 * specific device.
490 */
491#define USB_DEVICE(vend,prod) \
Alan Sternb724ae72005-10-24 15:36:00 -0400492 .match_flags = USB_DEVICE_ID_MATCH_DEVICE, .idVendor = (vend), \
493 .idProduct = (prod)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494/**
Alan Sternb724ae72005-10-24 15:36:00 -0400495 * USB_DEVICE_VER - macro used to describe a specific usb device with a
496 * version range
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 * @vend: the 16 bit USB Vendor ID
498 * @prod: the 16 bit USB Product ID
499 * @lo: the bcdDevice_lo value
500 * @hi: the bcdDevice_hi value
501 *
502 * This macro is used to create a struct usb_device_id that matches a
503 * specific device, with a version range.
504 */
505#define USB_DEVICE_VER(vend,prod,lo,hi) \
Alan Sternb724ae72005-10-24 15:36:00 -0400506 .match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION, \
507 .idVendor = (vend), .idProduct = (prod), \
508 .bcdDevice_lo = (lo), .bcdDevice_hi = (hi)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509
510/**
511 * USB_DEVICE_INFO - macro used to describe a class of usb devices
512 * @cl: bDeviceClass value
513 * @sc: bDeviceSubClass value
514 * @pr: bDeviceProtocol value
515 *
516 * This macro is used to create a struct usb_device_id that matches a
517 * specific class of devices.
518 */
519#define USB_DEVICE_INFO(cl,sc,pr) \
Alan Sternb724ae72005-10-24 15:36:00 -0400520 .match_flags = USB_DEVICE_ID_MATCH_DEV_INFO, .bDeviceClass = (cl), \
521 .bDeviceSubClass = (sc), .bDeviceProtocol = (pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522
523/**
524 * USB_INTERFACE_INFO - macro used to describe a class of usb interfaces
525 * @cl: bInterfaceClass value
526 * @sc: bInterfaceSubClass value
527 * @pr: bInterfaceProtocol value
528 *
529 * This macro is used to create a struct usb_device_id that matches a
530 * specific class of interfaces.
531 */
532#define USB_INTERFACE_INFO(cl,sc,pr) \
Alan Sternb724ae72005-10-24 15:36:00 -0400533 .match_flags = USB_DEVICE_ID_MATCH_INT_INFO, .bInterfaceClass = (cl), \
534 .bInterfaceSubClass = (sc), .bInterfaceProtocol = (pr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535
Alan Sternb724ae72005-10-24 15:36:00 -0400536/* ----------------------------------------------------------------------- */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -0800538struct usb_dynids {
539 spinlock_t lock;
540 struct list_head list;
541};
542
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543/**
544 * struct usb_driver - identifies USB driver to usbcore
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 * @name: The driver name should be unique among USB drivers,
546 * and should normally be the same as the module name.
547 * @probe: Called to see if the driver is willing to manage a particular
548 * interface on a device. If it is, probe returns zero and uses
549 * dev_set_drvdata() to associate driver-specific data with the
550 * interface. It may also use usb_set_interface() to specify the
551 * appropriate altsetting. If unwilling to manage the interface,
552 * return a negative errno value.
553 * @disconnect: Called when the interface is no longer accessible, usually
554 * because its device has been (or is being) disconnected or the
555 * driver module is being unloaded.
556 * @ioctl: Used for drivers that want to talk to userspace through
557 * the "usbfs" filesystem. This lets devices provide ways to
558 * expose information to user space regardless of where they
559 * do (or don't) show up otherwise in the filesystem.
560 * @suspend: Called when the device is going to be suspended by the system.
561 * @resume: Called when the device is being resumed by the system.
Alan Stern79efa092006-06-01 13:33:42 -0400562 * @pre_reset: Called by usb_reset_composite_device() when the device
563 * is about to be reset.
564 * @post_reset: Called by usb_reset_composite_device() after the device
565 * has been reset.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 * @id_table: USB drivers use ID table to support hotplugging.
567 * Export this with MODULE_DEVICE_TABLE(usb,...). This must be set
568 * or your driver's probe function will never get called.
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -0800569 * @dynids: used internally to hold the list of dynamically added device
570 * ids for this driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 * @driver: the driver model core driver structure.
Greg Kroah-Hartmanba9dc652005-11-16 13:41:28 -0800572 * @no_dynamic_id: if set to 1, the USB core will not allow dynamic ids to be
573 * added to this driver by preventing the sysfs file from being created.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 *
575 * USB drivers must provide a name, probe() and disconnect() methods,
576 * and an id_table. Other driver fields are optional.
577 *
578 * The id_table is used in hotplugging. It holds a set of descriptors,
579 * and specialized data may be associated with each entry. That table
580 * is used by both user and kernel mode hotplugging support.
581 *
582 * The probe() and disconnect() methods are called in a context where
583 * they can sleep, but they should avoid abusing the privilege. Most
584 * work to connect to a device should be done when the device is opened,
585 * and undone at the last close. The disconnect code needs to address
586 * concurrency issues with respect to open() and close() methods, as
587 * well as forcing all pending I/O requests to complete (by unlinking
588 * them as necessary, and blocking until the unlinks complete).
589 */
590struct usb_driver {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 const char *name;
592
593 int (*probe) (struct usb_interface *intf,
594 const struct usb_device_id *id);
595
596 void (*disconnect) (struct usb_interface *intf);
597
Alan Sternb724ae72005-10-24 15:36:00 -0400598 int (*ioctl) (struct usb_interface *intf, unsigned int code,
599 void *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600
David Brownell27d72e82005-04-18 17:39:22 -0700601 int (*suspend) (struct usb_interface *intf, pm_message_t message);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 int (*resume) (struct usb_interface *intf);
603
Alan Stern79efa092006-06-01 13:33:42 -0400604 void (*pre_reset) (struct usb_interface *intf);
605 void (*post_reset) (struct usb_interface *intf);
606
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 const struct usb_device_id *id_table;
608
Greg Kroah-Hartman733260f2005-11-16 13:41:28 -0800609 struct usb_dynids dynids;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 struct device_driver driver;
Greg Kroah-Hartmanba9dc652005-11-16 13:41:28 -0800611 unsigned int no_dynamic_id:1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612};
613#define to_usb_driver(d) container_of(d, struct usb_driver, driver)
614
615extern struct bus_type usb_bus_type;
616
617/**
618 * struct usb_class_driver - identifies a USB driver that wants to use the USB major number
Greg Kroah-Hartmand6e5bcf2005-06-20 21:15:16 -0700619 * @name: the usb class device name for this driver. Will show up in sysfs.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620 * @fops: pointer to the struct file_operations of this driver.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 * @minor_base: the start of the minor range for this driver.
622 *
623 * This structure is used for the usb_register_dev() and
624 * usb_unregister_dev() functions, to consolidate a number of the
625 * parameters used for them.
626 */
627struct usb_class_driver {
628 char *name;
Arjan van de Ven99ac48f2006-03-28 01:56:41 -0800629 const struct file_operations *fops;
Greg Kroah-Hartmand6e5bcf2005-06-20 21:15:16 -0700630 int minor_base;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700631};
632
633/*
634 * use these in module_init()/module_exit()
635 * and don't forget MODULE_DEVICE_TABLE(usb, ...)
636 */
Greg Kroah-Hartman2143acc2005-11-21 14:53:03 -0800637int usb_register_driver(struct usb_driver *, struct module *);
638static inline int usb_register(struct usb_driver *driver)
639{
640 return usb_register_driver(driver, THIS_MODULE);
641}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642extern void usb_deregister(struct usb_driver *);
643
644extern int usb_register_dev(struct usb_interface *intf,
645 struct usb_class_driver *class_driver);
646extern void usb_deregister_dev(struct usb_interface *intf,
647 struct usb_class_driver *class_driver);
648
649extern int usb_disabled(void);
650
Alan Sternb724ae72005-10-24 15:36:00 -0400651/* ----------------------------------------------------------------------- */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700652
653/*
654 * URB support, for asynchronous request completions
655 */
656
657/*
658 * urb->transfer_flags:
659 */
660#define URB_SHORT_NOT_OK 0x0001 /* report short reads as errors */
Alan Sternb724ae72005-10-24 15:36:00 -0400661#define URB_ISO_ASAP 0x0002 /* iso-only, urb->start_frame
662 * ignored */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663#define URB_NO_TRANSFER_DMA_MAP 0x0004 /* urb->transfer_dma valid on submit */
664#define URB_NO_SETUP_DMA_MAP 0x0008 /* urb->setup_dma valid on submit */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665#define URB_NO_FSBR 0x0020 /* UHCI-specific */
Alan Sternb724ae72005-10-24 15:36:00 -0400666#define URB_ZERO_PACKET 0x0040 /* Finish bulk OUT with short packet */
667#define URB_NO_INTERRUPT 0x0080 /* HINT: no non-error interrupt
668 * needed */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669
670struct usb_iso_packet_descriptor {
671 unsigned int offset;
672 unsigned int length; /* expected length */
673 unsigned int actual_length;
674 unsigned int status;
675};
676
677struct urb;
678struct pt_regs;
679
680typedef void (*usb_complete_t)(struct urb *, struct pt_regs *);
681
682/**
683 * struct urb - USB Request Block
684 * @urb_list: For use by current owner of the URB.
685 * @pipe: Holds endpoint number, direction, type, and more.
686 * Create these values with the eight macros available;
687 * usb_{snd,rcv}TYPEpipe(dev,endpoint), where the TYPE is "ctrl"
688 * (control), "bulk", "int" (interrupt), or "iso" (isochronous).
689 * For example usb_sndbulkpipe() or usb_rcvintpipe(). Endpoint
690 * numbers range from zero to fifteen. Note that "in" endpoint two
691 * is a different endpoint (and pipe) from "out" endpoint two.
692 * The current configuration controls the existence, type, and
693 * maximum packet size of any given endpoint.
694 * @dev: Identifies the USB device to perform the request.
695 * @status: This is read in non-iso completion functions to get the
696 * status of the particular request. ISO requests only use it
697 * to tell whether the URB was unlinked; detailed status for
698 * each frame is in the fields of the iso_frame-desc.
699 * @transfer_flags: A variety of flags may be used to affect how URB
700 * submission, unlinking, or operation are handled. Different
701 * kinds of URB can use different flags.
702 * @transfer_buffer: This identifies the buffer to (or from) which
703 * the I/O request will be performed (unless URB_NO_TRANSFER_DMA_MAP
704 * is set). This buffer must be suitable for DMA; allocate it with
705 * kmalloc() or equivalent. For transfers to "in" endpoints, contents
706 * of this buffer will be modified. This buffer is used for the data
707 * stage of control transfers.
708 * @transfer_dma: When transfer_flags includes URB_NO_TRANSFER_DMA_MAP,
709 * the device driver is saying that it provided this DMA address,
710 * which the host controller driver should use in preference to the
711 * transfer_buffer.
712 * @transfer_buffer_length: How big is transfer_buffer. The transfer may
713 * be broken up into chunks according to the current maximum packet
714 * size for the endpoint, which is a function of the configuration
715 * and is encoded in the pipe. When the length is zero, neither
716 * transfer_buffer nor transfer_dma is used.
717 * @actual_length: This is read in non-iso completion functions, and
718 * it tells how many bytes (out of transfer_buffer_length) were
719 * transferred. It will normally be the same as requested, unless
720 * either an error was reported or a short read was performed.
721 * The URB_SHORT_NOT_OK transfer flag may be used to make such
722 * short reads be reported as errors.
723 * @setup_packet: Only used for control transfers, this points to eight bytes
724 * of setup data. Control transfers always start by sending this data
725 * to the device. Then transfer_buffer is read or written, if needed.
726 * @setup_dma: For control transfers with URB_NO_SETUP_DMA_MAP set, the
727 * device driver has provided this DMA address for the setup packet.
728 * The host controller driver should use this in preference to
729 * setup_packet.
730 * @start_frame: Returns the initial frame for isochronous transfers.
731 * @number_of_packets: Lists the number of ISO transfer buffers.
732 * @interval: Specifies the polling interval for interrupt or isochronous
733 * transfers. The units are frames (milliseconds) for for full and low
734 * speed devices, and microframes (1/8 millisecond) for highspeed ones.
735 * @error_count: Returns the number of ISO transfers that reported errors.
736 * @context: For use in completion functions. This normally points to
737 * request-specific driver context.
738 * @complete: Completion handler. This URB is passed as the parameter to the
739 * completion function. The completion function may then do what
740 * it likes with the URB, including resubmitting or freeing it.
741 * @iso_frame_desc: Used to provide arrays of ISO transfer buffers and to
742 * collect the transfer status for each buffer.
743 *
744 * This structure identifies USB transfer requests. URBs must be allocated by
745 * calling usb_alloc_urb() and freed with a call to usb_free_urb().
746 * Initialization may be done using various usb_fill_*_urb() functions. URBs
747 * are submitted using usb_submit_urb(), and pending requests may be canceled
748 * using usb_unlink_urb() or usb_kill_urb().
749 *
750 * Data Transfer Buffers:
751 *
752 * Normally drivers provide I/O buffers allocated with kmalloc() or otherwise
753 * taken from the general page pool. That is provided by transfer_buffer
754 * (control requests also use setup_packet), and host controller drivers
755 * perform a dma mapping (and unmapping) for each buffer transferred. Those
756 * mapping operations can be expensive on some platforms (perhaps using a dma
757 * bounce buffer or talking to an IOMMU),
758 * although they're cheap on commodity x86 and ppc hardware.
759 *
760 * Alternatively, drivers may pass the URB_NO_xxx_DMA_MAP transfer flags,
761 * which tell the host controller driver that no such mapping is needed since
762 * the device driver is DMA-aware. For example, a device driver might
763 * allocate a DMA buffer with usb_buffer_alloc() or call usb_buffer_map().
764 * When these transfer flags are provided, host controller drivers will
765 * attempt to use the dma addresses found in the transfer_dma and/or
766 * setup_dma fields rather than determining a dma address themselves. (Note
767 * that transfer_buffer and setup_packet must still be set because not all
768 * host controllers use DMA, nor do virtual root hubs).
769 *
770 * Initialization:
771 *
772 * All URBs submitted must initialize the dev, pipe, transfer_flags (may be
Alan Sternb375a042005-07-29 16:11:07 -0400773 * zero), and complete fields. All URBs must also initialize
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 * transfer_buffer and transfer_buffer_length. They may provide the
775 * URB_SHORT_NOT_OK transfer flag, indicating that short reads are
776 * to be treated as errors; that flag is invalid for write requests.
777 *
778 * Bulk URBs may
779 * use the URB_ZERO_PACKET transfer flag, indicating that bulk OUT transfers
780 * should always terminate with a short packet, even if it means adding an
781 * extra zero length packet.
782 *
783 * Control URBs must provide a setup_packet. The setup_packet and
784 * transfer_buffer may each be mapped for DMA or not, independently of
785 * the other. The transfer_flags bits URB_NO_TRANSFER_DMA_MAP and
786 * URB_NO_SETUP_DMA_MAP indicate which buffers have already been mapped.
787 * URB_NO_SETUP_DMA_MAP is ignored for non-control URBs.
788 *
789 * Interrupt URBs must provide an interval, saying how often (in milliseconds
790 * or, for highspeed devices, 125 microsecond units)
791 * to poll for transfers. After the URB has been submitted, the interval
792 * field reflects how the transfer was actually scheduled.
793 * The polling interval may be more frequent than requested.
794 * For example, some controllers have a maximum interval of 32 milliseconds,
795 * while others support intervals of up to 1024 milliseconds.
796 * Isochronous URBs also have transfer intervals. (Note that for isochronous
797 * endpoints, as well as high speed interrupt endpoints, the encoding of
798 * the transfer interval in the endpoint descriptor is logarithmic.
799 * Device drivers must convert that value to linear units themselves.)
800 *
801 * Isochronous URBs normally use the URB_ISO_ASAP transfer flag, telling
802 * the host controller to schedule the transfer as soon as bandwidth
803 * utilization allows, and then set start_frame to reflect the actual frame
804 * selected during submission. Otherwise drivers must specify the start_frame
805 * and handle the case where the transfer can't begin then. However, drivers
806 * won't know how bandwidth is currently allocated, and while they can
807 * find the current frame using usb_get_current_frame_number () they can't
808 * know the range for that frame number. (Ranges for frame counter values
809 * are HC-specific, and can go from 256 to 65536 frames from "now".)
810 *
811 * Isochronous URBs have a different data transfer model, in part because
812 * the quality of service is only "best effort". Callers provide specially
813 * allocated URBs, with number_of_packets worth of iso_frame_desc structures
814 * at the end. Each such packet is an individual ISO transfer. Isochronous
815 * URBs are normally queued, submitted by drivers to arrange that
816 * transfers are at least double buffered, and then explicitly resubmitted
817 * in completion handlers, so
818 * that data (such as audio or video) streams at as constant a rate as the
819 * host controller scheduler can support.
820 *
821 * Completion Callbacks:
822 *
823 * The completion callback is made in_interrupt(), and one of the first
824 * things that a completion handler should do is check the status field.
825 * The status field is provided for all URBs. It is used to report
826 * unlinked URBs, and status for all non-ISO transfers. It should not
827 * be examined before the URB is returned to the completion handler.
828 *
829 * The context field is normally used to link URBs back to the relevant
830 * driver or request state.
831 *
832 * When the completion callback is invoked for non-isochronous URBs, the
833 * actual_length field tells how many bytes were transferred. This field
834 * is updated even when the URB terminated with an error or was unlinked.
835 *
836 * ISO transfer status is reported in the status and actual_length fields
837 * of the iso_frame_desc array, and the number of errors is reported in
838 * error_count. Completion callbacks for ISO transfers will normally
839 * (re)submit URBs to ensure a constant transfer rate.
Roman Kagan719df462005-05-06 00:55:56 +0400840 *
841 * Note that even fields marked "public" should not be touched by the driver
842 * when the urb is owned by the hcd, that is, since the call to
843 * usb_submit_urb() till the entry into the completion routine.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844 */
845struct urb
846{
Martin Waitzaeec46b2005-11-13 16:08:13 -0800847 /* private: usb core and host controller only fields in the urb */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 struct kref kref; /* reference count of the URB */
849 spinlock_t lock; /* lock for the URB */
850 void *hcpriv; /* private data for host controller */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700851 int bandwidth; /* bandwidth for INT/ISO request */
852 atomic_t use_count; /* concurrent submissions counter */
853 u8 reject; /* submissions will fail */
854
Martin Waitzaeec46b2005-11-13 16:08:13 -0800855 /* public: documented fields in the urb that can be used by drivers */
Alan Sternb724ae72005-10-24 15:36:00 -0400856 struct list_head urb_list; /* list head for use by the urb's
857 * current owner */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 struct usb_device *dev; /* (in) pointer to associated device */
859 unsigned int pipe; /* (in) pipe information */
860 int status; /* (return) non-ISO status */
861 unsigned int transfer_flags; /* (in) URB_SHORT_NOT_OK | ...*/
862 void *transfer_buffer; /* (in) associated data buffer */
863 dma_addr_t transfer_dma; /* (in) dma addr for transfer_buffer */
864 int transfer_buffer_length; /* (in) data buffer length */
865 int actual_length; /* (return) actual transfer length */
866 unsigned char *setup_packet; /* (in) setup packet (control only) */
867 dma_addr_t setup_dma; /* (in) dma addr for setup_packet */
868 int start_frame; /* (modify) start frame (ISO) */
869 int number_of_packets; /* (in) number of ISO packets */
Alan Sternb724ae72005-10-24 15:36:00 -0400870 int interval; /* (modify) transfer interval
871 * (INT/ISO) */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 int error_count; /* (return) number of ISO errors */
873 void *context; /* (in) context for completion */
874 usb_complete_t complete; /* (in) completion routine */
Alan Sternb724ae72005-10-24 15:36:00 -0400875 struct usb_iso_packet_descriptor iso_frame_desc[0];
876 /* (in) ISO ONLY */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877};
878
Alan Sternb724ae72005-10-24 15:36:00 -0400879/* ----------------------------------------------------------------------- */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880
881/**
882 * usb_fill_control_urb - initializes a control urb
883 * @urb: pointer to the urb to initialize.
884 * @dev: pointer to the struct usb_device for this urb.
885 * @pipe: the endpoint pipe
886 * @setup_packet: pointer to the setup_packet buffer
887 * @transfer_buffer: pointer to the transfer buffer
888 * @buffer_length: length of the transfer buffer
889 * @complete: pointer to the usb_complete_t function
890 * @context: what to set the urb context to.
891 *
892 * Initializes a control urb with the proper information needed to submit
893 * it to a device.
894 */
895static inline void usb_fill_control_urb (struct urb *urb,
896 struct usb_device *dev,
897 unsigned int pipe,
898 unsigned char *setup_packet,
899 void *transfer_buffer,
900 int buffer_length,
901 usb_complete_t complete,
902 void *context)
903{
904 spin_lock_init(&urb->lock);
905 urb->dev = dev;
906 urb->pipe = pipe;
907 urb->setup_packet = setup_packet;
908 urb->transfer_buffer = transfer_buffer;
909 urb->transfer_buffer_length = buffer_length;
910 urb->complete = complete;
911 urb->context = context;
912}
913
914/**
915 * usb_fill_bulk_urb - macro to help initialize a bulk urb
916 * @urb: pointer to the urb to initialize.
917 * @dev: pointer to the struct usb_device for this urb.
918 * @pipe: the endpoint pipe
919 * @transfer_buffer: pointer to the transfer buffer
920 * @buffer_length: length of the transfer buffer
921 * @complete: pointer to the usb_complete_t function
922 * @context: what to set the urb context to.
923 *
924 * Initializes a bulk urb with the proper information needed to submit it
925 * to a device.
926 */
927static inline void usb_fill_bulk_urb (struct urb *urb,
928 struct usb_device *dev,
929 unsigned int pipe,
930 void *transfer_buffer,
931 int buffer_length,
932 usb_complete_t complete,
933 void *context)
934{
935 spin_lock_init(&urb->lock);
936 urb->dev = dev;
937 urb->pipe = pipe;
938 urb->transfer_buffer = transfer_buffer;
939 urb->transfer_buffer_length = buffer_length;
940 urb->complete = complete;
941 urb->context = context;
942}
943
944/**
945 * usb_fill_int_urb - macro to help initialize a interrupt urb
946 * @urb: pointer to the urb to initialize.
947 * @dev: pointer to the struct usb_device for this urb.
948 * @pipe: the endpoint pipe
949 * @transfer_buffer: pointer to the transfer buffer
950 * @buffer_length: length of the transfer buffer
951 * @complete: pointer to the usb_complete_t function
952 * @context: what to set the urb context to.
953 * @interval: what to set the urb interval to, encoded like
954 * the endpoint descriptor's bInterval value.
955 *
956 * Initializes a interrupt urb with the proper information needed to submit
957 * it to a device.
958 * Note that high speed interrupt endpoints use a logarithmic encoding of
959 * the endpoint interval, and express polling intervals in microframes
960 * (eight per millisecond) rather than in frames (one per millisecond).
961 */
962static inline void usb_fill_int_urb (struct urb *urb,
963 struct usb_device *dev,
964 unsigned int pipe,
965 void *transfer_buffer,
966 int buffer_length,
967 usb_complete_t complete,
968 void *context,
969 int interval)
970{
971 spin_lock_init(&urb->lock);
972 urb->dev = dev;
973 urb->pipe = pipe;
974 urb->transfer_buffer = transfer_buffer;
975 urb->transfer_buffer_length = buffer_length;
976 urb->complete = complete;
977 urb->context = context;
978 if (dev->speed == USB_SPEED_HIGH)
979 urb->interval = 1 << (interval - 1);
980 else
981 urb->interval = interval;
982 urb->start_frame = -1;
983}
984
985extern void usb_init_urb(struct urb *urb);
Al Viro55016f12005-10-21 03:21:58 -0400986extern struct urb *usb_alloc_urb(int iso_packets, gfp_t mem_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987extern void usb_free_urb(struct urb *urb);
988#define usb_put_urb usb_free_urb
989extern struct urb *usb_get_urb(struct urb *urb);
Al Viro55016f12005-10-21 03:21:58 -0400990extern int usb_submit_urb(struct urb *urb, gfp_t mem_flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991extern int usb_unlink_urb(struct urb *urb);
992extern void usb_kill_urb(struct urb *urb);
993
994#define HAVE_USB_BUFFERS
995void *usb_buffer_alloc (struct usb_device *dev, size_t size,
Al Viro55016f12005-10-21 03:21:58 -0400996 gfp_t mem_flags, dma_addr_t *dma);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997void usb_buffer_free (struct usb_device *dev, size_t size,
998 void *addr, dma_addr_t dma);
999
1000#if 0
1001struct urb *usb_buffer_map (struct urb *urb);
1002void usb_buffer_dmasync (struct urb *urb);
1003void usb_buffer_unmap (struct urb *urb);
1004#endif
1005
1006struct scatterlist;
1007int usb_buffer_map_sg (struct usb_device *dev, unsigned pipe,
1008 struct scatterlist *sg, int nents);
1009#if 0
1010void usb_buffer_dmasync_sg (struct usb_device *dev, unsigned pipe,
1011 struct scatterlist *sg, int n_hw_ents);
1012#endif
1013void usb_buffer_unmap_sg (struct usb_device *dev, unsigned pipe,
1014 struct scatterlist *sg, int n_hw_ents);
1015
1016/*-------------------------------------------------------------------*
1017 * SYNCHRONOUS CALL SUPPORT *
1018 *-------------------------------------------------------------------*/
1019
1020extern int usb_control_msg(struct usb_device *dev, unsigned int pipe,
1021 __u8 request, __u8 requesttype, __u16 value, __u16 index,
1022 void *data, __u16 size, int timeout);
Greg Kroah-Hartman782a7a62006-05-19 13:20:20 -07001023extern int usb_interrupt_msg(struct usb_device *usb_dev, unsigned int pipe,
1024 void *data, int len, int *actual_length, int timeout);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025extern int usb_bulk_msg(struct usb_device *usb_dev, unsigned int pipe,
1026 void *data, int len, int *actual_length,
1027 int timeout);
1028
Linus Torvalds1da177e2005-04-16 15:20:36 -07001029/* wrappers around usb_control_msg() for the most common standard requests */
1030extern int usb_get_descriptor(struct usb_device *dev, unsigned char desctype,
1031 unsigned char descindex, void *buf, int size);
1032extern int usb_get_status(struct usb_device *dev,
1033 int type, int target, void *data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034extern int usb_string(struct usb_device *dev, int index,
1035 char *buf, size_t size);
1036
1037/* wrappers that also update important state inside usbcore */
1038extern int usb_clear_halt(struct usb_device *dev, int pipe);
1039extern int usb_reset_configuration(struct usb_device *dev);
1040extern int usb_set_interface(struct usb_device *dev, int ifnum, int alternate);
1041
1042/*
1043 * timeouts, in milliseconds, used for sending/receiving control messages
1044 * they typically complete within a few frames (msec) after they're issued
1045 * USB identifies 5 second timeouts, maybe more in a few cases, and a few
1046 * slow devices (like some MGE Ellipse UPSes) actually push that limit.
1047 */
1048#define USB_CTRL_GET_TIMEOUT 5000
1049#define USB_CTRL_SET_TIMEOUT 5000
1050
1051
1052/**
1053 * struct usb_sg_request - support for scatter/gather I/O
1054 * @status: zero indicates success, else negative errno
1055 * @bytes: counts bytes transferred.
1056 *
1057 * These requests are initialized using usb_sg_init(), and then are used
1058 * as request handles passed to usb_sg_wait() or usb_sg_cancel(). Most
1059 * members of the request object aren't for driver access.
1060 *
1061 * The status and bytecount values are valid only after usb_sg_wait()
1062 * returns. If the status is zero, then the bytecount matches the total
1063 * from the request.
1064 *
1065 * After an error completion, drivers may need to clear a halt condition
1066 * on the endpoint.
1067 */
1068struct usb_sg_request {
1069 int status;
1070 size_t bytes;
1071
1072 /*
Martin Waitzaeec46b2005-11-13 16:08:13 -08001073 * members below are private: to usbcore,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001074 * and are not provided for driver access!
1075 */
1076 spinlock_t lock;
1077
1078 struct usb_device *dev;
1079 int pipe;
1080 struct scatterlist *sg;
1081 int nents;
1082
1083 int entries;
1084 struct urb **urbs;
1085
1086 int count;
1087 struct completion complete;
1088};
1089
1090int usb_sg_init (
1091 struct usb_sg_request *io,
1092 struct usb_device *dev,
1093 unsigned pipe,
1094 unsigned period,
1095 struct scatterlist *sg,
1096 int nents,
1097 size_t length,
Al Viro55016f12005-10-21 03:21:58 -04001098 gfp_t mem_flags
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099);
1100void usb_sg_cancel (struct usb_sg_request *io);
1101void usb_sg_wait (struct usb_sg_request *io);
1102
1103
Alan Sternb724ae72005-10-24 15:36:00 -04001104/* ----------------------------------------------------------------------- */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001105
1106/*
1107 * For various legacy reasons, Linux has a small cookie that's paired with
1108 * a struct usb_device to identify an endpoint queue. Queue characteristics
1109 * are defined by the endpoint's descriptor. This cookie is called a "pipe",
1110 * an unsigned int encoded as:
1111 *
1112 * - direction: bit 7 (0 = Host-to-Device [Out],
1113 * 1 = Device-to-Host [In] ...
1114 * like endpoint bEndpointAddress)
1115 * - device address: bits 8-14 ... bit positions known to uhci-hcd
1116 * - endpoint: bits 15-18 ... bit positions known to uhci-hcd
1117 * - pipe type: bits 30-31 (00 = isochronous, 01 = interrupt,
1118 * 10 = control, 11 = bulk)
1119 *
1120 * Given the device address and endpoint descriptor, pipes are redundant.
1121 */
1122
1123/* NOTE: these are not the standard USB_ENDPOINT_XFER_* values!! */
1124/* (yet ... they're the values used by usbfs) */
1125#define PIPE_ISOCHRONOUS 0
1126#define PIPE_INTERRUPT 1
1127#define PIPE_CONTROL 2
1128#define PIPE_BULK 3
1129
1130#define usb_pipein(pipe) ((pipe) & USB_DIR_IN)
1131#define usb_pipeout(pipe) (!usb_pipein(pipe))
1132
1133#define usb_pipedevice(pipe) (((pipe) >> 8) & 0x7f)
1134#define usb_pipeendpoint(pipe) (((pipe) >> 15) & 0xf)
1135
1136#define usb_pipetype(pipe) (((pipe) >> 30) & 3)
1137#define usb_pipeisoc(pipe) (usb_pipetype((pipe)) == PIPE_ISOCHRONOUS)
1138#define usb_pipeint(pipe) (usb_pipetype((pipe)) == PIPE_INTERRUPT)
1139#define usb_pipecontrol(pipe) (usb_pipetype((pipe)) == PIPE_CONTROL)
1140#define usb_pipebulk(pipe) (usb_pipetype((pipe)) == PIPE_BULK)
1141
1142/* The D0/D1 toggle bits ... USE WITH CAUTION (they're almost hcd-internal) */
1143#define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> (ep)) & 1)
1144#define usb_dotoggle(dev, ep, out) ((dev)->toggle[out] ^= (1 << (ep)))
Alan Sternb724ae72005-10-24 15:36:00 -04001145#define usb_settoggle(dev, ep, out, bit) \
1146 ((dev)->toggle[out] = ((dev)->toggle[out] & ~(1 << (ep))) | \
1147 ((bit) << (ep)))
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148
1149
Alan Sternb724ae72005-10-24 15:36:00 -04001150static inline unsigned int __create_pipe(struct usb_device *dev,
1151 unsigned int endpoint)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001152{
1153 return (dev->devnum << 8) | (endpoint << 15);
1154}
1155
1156/* Create various pipes... */
Alan Sternb724ae72005-10-24 15:36:00 -04001157#define usb_sndctrlpipe(dev,endpoint) \
1158 ((PIPE_CONTROL << 30) | __create_pipe(dev,endpoint))
1159#define usb_rcvctrlpipe(dev,endpoint) \
1160 ((PIPE_CONTROL << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN)
1161#define usb_sndisocpipe(dev,endpoint) \
1162 ((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev,endpoint))
1163#define usb_rcvisocpipe(dev,endpoint) \
1164 ((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN)
1165#define usb_sndbulkpipe(dev,endpoint) \
1166 ((PIPE_BULK << 30) | __create_pipe(dev,endpoint))
1167#define usb_rcvbulkpipe(dev,endpoint) \
1168 ((PIPE_BULK << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN)
1169#define usb_sndintpipe(dev,endpoint) \
1170 ((PIPE_INTERRUPT << 30) | __create_pipe(dev,endpoint))
1171#define usb_rcvintpipe(dev,endpoint) \
1172 ((PIPE_INTERRUPT << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173
1174/*-------------------------------------------------------------------------*/
1175
1176static inline __u16
1177usb_maxpacket(struct usb_device *udev, int pipe, int is_out)
1178{
1179 struct usb_host_endpoint *ep;
1180 unsigned epnum = usb_pipeendpoint(pipe);
1181
1182 if (is_out) {
1183 WARN_ON(usb_pipein(pipe));
1184 ep = udev->ep_out[epnum];
1185 } else {
1186 WARN_ON(usb_pipeout(pipe));
1187 ep = udev->ep_in[epnum];
1188 }
1189 if (!ep)
1190 return 0;
1191
1192 /* NOTE: only 0x07ff bits are for packet size... */
1193 return le16_to_cpu(ep->desc.wMaxPacketSize);
1194}
1195
Alan Sternb724ae72005-10-24 15:36:00 -04001196/* ----------------------------------------------------------------------- */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001197
Greg Kroah-Hartman3099e752005-06-20 21:15:16 -07001198/* Events from the usb core */
1199#define USB_DEVICE_ADD 0x0001
1200#define USB_DEVICE_REMOVE 0x0002
1201#define USB_BUS_ADD 0x0003
1202#define USB_BUS_REMOVE 0x0004
1203extern void usb_register_notify(struct notifier_block *nb);
1204extern void usb_unregister_notify(struct notifier_block *nb);
1205
Linus Torvalds1da177e2005-04-16 15:20:36 -07001206#ifdef DEBUG
Alan Sternb724ae72005-10-24 15:36:00 -04001207#define dbg(format, arg...) printk(KERN_DEBUG "%s: " format "\n" , \
1208 __FILE__ , ## arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001209#else
1210#define dbg(format, arg...) do {} while (0)
1211#endif
1212
Alan Sternb724ae72005-10-24 15:36:00 -04001213#define err(format, arg...) printk(KERN_ERR "%s: " format "\n" , \
1214 __FILE__ , ## arg)
1215#define info(format, arg...) printk(KERN_INFO "%s: " format "\n" , \
1216 __FILE__ , ## arg)
1217#define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n" , \
1218 __FILE__ , ## arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219
1220
1221#endif /* __KERNEL__ */
1222
1223#endif