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[linux-2.6/verdex.git] / include / linux / usb.h
blob3d508bf0840270a136a371b8d175bbc861b14e14
1 #ifndef __LINUX_USB_H
2 #define __LINUX_USB_H
4 #include <linux/mod_devicetable.h>
5 #include <linux/usb_ch9.h>
7 #define USB_MAJOR 180
10 #ifdef __KERNEL__
12 #include <linux/config.h>
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 */
23 struct usb_device;
24 struct usb_driver;
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.
43 /**
44 * struct usb_host_endpoint - host-side endpoint descriptor and queue
45 * @desc: descriptor for this endpoint, wMaxPacketSize in native byteorder
46 * @urb_list: urbs queued to this endpoint; maintained by usbcore
47 * @hcpriv: for use by HCD; typically holds hardware dma queue head (QH)
48 * with one or more transfer descriptors (TDs) per urb
49 * @extra: descriptors following this endpoint in the configuration
50 * @extralen: how many bytes of "extra" are valid
52 * USB requests are always queued to a given endpoint, identified by a
53 * descriptor within an active interface in a given USB configuration.
55 struct usb_host_endpoint {
56 struct usb_endpoint_descriptor desc;
57 struct list_head urb_list;
58 void *hcpriv;
60 unsigned char *extra; /* Extra descriptors */
61 int extralen;
64 /* host-side wrapper for one interface setting's parsed descriptors */
65 struct usb_host_interface {
66 struct usb_interface_descriptor desc;
68 /* array of desc.bNumEndpoint endpoints associated with this
69 * interface setting. these will be in no particular order.
71 struct usb_host_endpoint *endpoint;
73 char *string; /* iInterface string, if present */
74 unsigned char *extra; /* Extra descriptors */
75 int extralen;
78 enum usb_interface_condition {
79 USB_INTERFACE_UNBOUND = 0,
80 USB_INTERFACE_BINDING,
81 USB_INTERFACE_BOUND,
82 USB_INTERFACE_UNBINDING,
85 /**
86 * struct usb_interface - what usb device drivers talk to
87 * @altsetting: array of interface structures, one for each alternate
88 * setting that may be selected. Each one includes a set of
89 * endpoint configurations. They will be in no particular order.
90 * @num_altsetting: number of altsettings defined.
91 * @cur_altsetting: the current altsetting.
92 * @driver: the USB driver that is bound to this interface.
93 * @minor: the minor number assigned to this interface, if this
94 * interface is bound to a driver that uses the USB major number.
95 * If this interface does not use the USB major, this field should
96 * be unused. The driver should set this value in the probe()
97 * function of the driver, after it has been assigned a minor
98 * number from the USB core by calling usb_register_dev().
99 * @condition: binding state of the interface: not bound, binding
100 * (in probe()), bound to a driver, or unbinding (in disconnect())
101 * @dev: driver model's view of this device
102 * @class_dev: driver model's class view of this device.
104 * USB device drivers attach to interfaces on a physical device. Each
105 * interface encapsulates a single high level function, such as feeding
106 * an audio stream to a speaker or reporting a change in a volume control.
107 * Many USB devices only have one interface. The protocol used to talk to
108 * an interface's endpoints can be defined in a usb "class" specification,
109 * or by a product's vendor. The (default) control endpoint is part of
110 * every interface, but is never listed among the interface's descriptors.
112 * The driver that is bound to the interface can use standard driver model
113 * calls such as dev_get_drvdata() on the dev member of this structure.
115 * Each interface may have alternate settings. The initial configuration
116 * of a device sets altsetting 0, but the device driver can change
117 * that setting using usb_set_interface(). Alternate settings are often
118 * used to control the the use of periodic endpoints, such as by having
119 * different endpoints use different amounts of reserved USB bandwidth.
120 * All standards-conformant USB devices that use isochronous endpoints
121 * will use them in non-default settings.
123 * The USB specification says that alternate setting numbers must run from
124 * 0 to one less than the total number of alternate settings. But some
125 * devices manage to mess this up, and the structures aren't necessarily
126 * stored in numerical order anyhow. Use usb_altnum_to_altsetting() to
127 * look up an alternate setting in the altsetting array based on its number.
129 struct usb_interface {
130 /* array of alternate settings for this interface,
131 * stored in no particular order */
132 struct usb_host_interface *altsetting;
134 struct usb_host_interface *cur_altsetting; /* the currently
135 * active alternate setting */
136 unsigned num_altsetting; /* number of alternate settings */
138 int minor; /* minor number this interface is bound to */
139 enum usb_interface_condition condition; /* state of binding */
140 struct device dev; /* interface specific device info */
141 struct class_device *class_dev;
143 #define to_usb_interface(d) container_of(d, struct usb_interface, dev)
144 #define interface_to_usbdev(intf) \
145 container_of(intf->dev.parent, struct usb_device, dev)
147 static inline void *usb_get_intfdata (struct usb_interface *intf)
149 return dev_get_drvdata (&intf->dev);
152 static inline void usb_set_intfdata (struct usb_interface *intf, void *data)
154 dev_set_drvdata(&intf->dev, data);
157 struct usb_interface *usb_get_intf(struct usb_interface *intf);
158 void usb_put_intf(struct usb_interface *intf);
160 /* this maximum is arbitrary */
161 #define USB_MAXINTERFACES 32
164 * struct usb_interface_cache - long-term representation of a device interface
165 * @num_altsetting: number of altsettings defined.
166 * @ref: reference counter.
167 * @altsetting: variable-length array of interface structures, one for
168 * each alternate setting that may be selected. Each one includes a
169 * set of endpoint configurations. They will be in no particular order.
171 * These structures persist for the lifetime of a usb_device, unlike
172 * struct usb_interface (which persists only as long as its configuration
173 * is installed). The altsetting arrays can be accessed through these
174 * structures at any time, permitting comparison of configurations and
175 * providing support for the /proc/bus/usb/devices pseudo-file.
177 struct usb_interface_cache {
178 unsigned num_altsetting; /* number of alternate settings */
179 struct kref ref; /* reference counter */
181 /* variable-length array of alternate settings for this interface,
182 * stored in no particular order */
183 struct usb_host_interface altsetting[0];
185 #define ref_to_usb_interface_cache(r) \
186 container_of(r, struct usb_interface_cache, ref)
187 #define altsetting_to_usb_interface_cache(a) \
188 container_of(a, struct usb_interface_cache, altsetting[0])
191 * struct usb_host_config - representation of a device's configuration
192 * @desc: the device's configuration descriptor.
193 * @string: pointer to the cached version of the iConfiguration string, if
194 * present for this configuration.
195 * @interface: array of pointers to usb_interface structures, one for each
196 * interface in the configuration. The number of interfaces is stored
197 * in desc.bNumInterfaces. These pointers are valid only while the
198 * the configuration is active.
199 * @intf_cache: array of pointers to usb_interface_cache structures, one
200 * for each interface in the configuration. These structures exist
201 * for the entire life of the device.
202 * @extra: pointer to buffer containing all extra descriptors associated
203 * with this configuration (those preceding the first interface
204 * descriptor).
205 * @extralen: length of the extra descriptors buffer.
207 * USB devices may have multiple configurations, but only one can be active
208 * at any time. Each encapsulates a different operational environment;
209 * for example, a dual-speed device would have separate configurations for
210 * full-speed and high-speed operation. The number of configurations
211 * available is stored in the device descriptor as bNumConfigurations.
213 * A configuration can contain multiple interfaces. Each corresponds to
214 * a different function of the USB device, and all are available whenever
215 * the configuration is active. The USB standard says that interfaces
216 * are supposed to be numbered from 0 to desc.bNumInterfaces-1, but a lot
217 * of devices get this wrong. In addition, the interface array is not
218 * guaranteed to be sorted in numerical order. Use usb_ifnum_to_if() to
219 * look up an interface entry based on its number.
221 * Device drivers should not attempt to activate configurations. The choice
222 * of which configuration to install is a policy decision based on such
223 * considerations as available power, functionality provided, and the user's
224 * desires (expressed through hotplug scripts). However, drivers can call
225 * usb_reset_configuration() to reinitialize the current configuration and
226 * all its interfaces.
228 struct usb_host_config {
229 struct usb_config_descriptor desc;
231 char *string;
232 /* the interfaces associated with this configuration,
233 * stored in no particular order */
234 struct usb_interface *interface[USB_MAXINTERFACES];
236 /* Interface information available even when this is not the
237 * active configuration */
238 struct usb_interface_cache *intf_cache[USB_MAXINTERFACES];
240 unsigned char *extra; /* Extra descriptors */
241 int extralen;
244 int __usb_get_extra_descriptor(char *buffer, unsigned size,
245 unsigned char type, void **ptr);
246 #define usb_get_extra_descriptor(ifpoint,type,ptr)\
247 __usb_get_extra_descriptor((ifpoint)->extra,(ifpoint)->extralen,\
248 type,(void**)ptr)
250 /* -------------------------------------------------------------------------- */
252 struct usb_operations;
254 /* USB device number allocation bitmap */
255 struct usb_devmap {
256 unsigned long devicemap[128 / (8*sizeof(unsigned long))];
260 * Allocated per bus (tree of devices) we have:
262 struct usb_bus {
263 struct device *controller; /* host/master side hardware */
264 int busnum; /* Bus number (in order of reg) */
265 char *bus_name; /* stable id (PCI slot_name etc) */
266 u8 otg_port; /* 0, or number of OTG/HNP port */
267 unsigned is_b_host:1; /* true during some HNP roleswitches */
268 unsigned b_hnp_enable:1; /* OTG: did A-Host enable HNP? */
270 int devnum_next; /* Next open device number in round-robin allocation */
272 struct usb_devmap devmap; /* device address allocation map */
273 struct usb_operations *op; /* Operations (specific to the HC) */
274 struct usb_device *root_hub; /* Root hub */
275 struct list_head bus_list; /* list of busses */
276 void *hcpriv; /* Host Controller private data */
278 int bandwidth_allocated; /* on this bus: how much of the time
279 * reserved for periodic (intr/iso)
280 * requests is used, on average?
281 * Units: microseconds/frame.
282 * Limits: Full/low speed reserve 90%,
283 * while high speed reserves 80%.
285 int bandwidth_int_reqs; /* number of Interrupt requests */
286 int bandwidth_isoc_reqs; /* number of Isoc. requests */
288 struct dentry *usbfs_dentry; /* usbfs dentry entry for the bus */
290 struct class_device *class_dev; /* class device for this bus */
291 struct kref kref; /* handles reference counting this bus */
292 void (*release)(struct usb_bus *bus); /* function to destroy this bus's memory */
293 #if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
294 struct mon_bus *mon_bus; /* non-null when associated */
295 int monitored; /* non-zero when monitored */
296 #endif
299 /* -------------------------------------------------------------------------- */
301 /* This is arbitrary.
302 * From USB 2.0 spec Table 11-13, offset 7, a hub can
303 * have up to 255 ports. The most yet reported is 10.
305 #define USB_MAXCHILDREN (16)
307 struct usb_tt;
310 * struct usb_device - kernel's representation of a USB device
312 * FIXME: Write the kerneldoc!
314 * Usbcore drivers should not set usbdev->state directly. Instead use
315 * usb_set_device_state().
317 struct usb_device {
318 int devnum; /* Address on USB bus */
319 char devpath [16]; /* Use in messages: /port/port/... */
320 enum usb_device_state state; /* configured, not attached, etc */
321 enum usb_device_speed speed; /* high/full/low (or error) */
323 struct usb_tt *tt; /* low/full speed dev, highspeed hub */
324 int ttport; /* device port on that tt hub */
326 struct semaphore serialize;
328 unsigned int toggle[2]; /* one bit for each endpoint ([0] = IN, [1] = OUT) */
330 struct usb_device *parent; /* our hub, unless we're the root */
331 struct usb_bus *bus; /* Bus we're part of */
332 struct usb_host_endpoint ep0;
334 struct device dev; /* Generic device interface */
336 struct usb_device_descriptor descriptor;/* Descriptor */
337 struct usb_host_config *config; /* All of the configs */
339 struct usb_host_config *actconfig;/* the active configuration */
340 struct usb_host_endpoint *ep_in[16];
341 struct usb_host_endpoint *ep_out[16];
343 char **rawdescriptors; /* Raw descriptors for each config */
345 int have_langid; /* whether string_langid is valid yet */
346 int string_langid; /* language ID for strings */
348 char *product;
349 char *manufacturer;
350 char *serial; /* static strings from the device */
351 struct list_head filelist;
352 struct dentry *usbfs_dentry; /* usbfs dentry entry for the device */
355 * Child devices - these can be either new devices
356 * (if this is a hub device), or different instances
357 * of this same device.
359 * Each instance needs its own set of data structures.
362 int maxchild; /* Number of ports if hub */
363 struct usb_device *children[USB_MAXCHILDREN];
365 #define to_usb_device(d) container_of(d, struct usb_device, dev)
367 extern struct usb_device *usb_get_dev(struct usb_device *dev);
368 extern void usb_put_dev(struct usb_device *dev);
370 extern void usb_lock_device(struct usb_device *udev);
371 extern int usb_trylock_device(struct usb_device *udev);
372 extern int usb_lock_device_for_reset(struct usb_device *udev,
373 struct usb_interface *iface);
374 extern void usb_unlock_device(struct usb_device *udev);
376 /* USB port reset for device reinitialization */
377 extern int usb_reset_device(struct usb_device *dev);
379 extern struct usb_device *usb_find_device(u16 vendor_id, u16 product_id);
381 /*-------------------------------------------------------------------------*/
383 /* for drivers using iso endpoints */
384 extern int usb_get_current_frame_number (struct usb_device *usb_dev);
386 /* used these for multi-interface device registration */
387 extern int usb_driver_claim_interface(struct usb_driver *driver,
388 struct usb_interface *iface, void* priv);
391 * usb_interface_claimed - returns true iff an interface is claimed
392 * @iface: the interface being checked
394 * Returns true (nonzero) iff the interface is claimed, else false (zero).
395 * Callers must own the driver model's usb bus readlock. So driver
396 * probe() entries don't need extra locking, but other call contexts
397 * may need to explicitly claim that lock.
400 static inline int usb_interface_claimed(struct usb_interface *iface) {
401 return (iface->dev.driver != NULL);
404 extern void usb_driver_release_interface(struct usb_driver *driver,
405 struct usb_interface *iface);
406 const struct usb_device_id *usb_match_id(struct usb_interface *interface,
407 const struct usb_device_id *id);
409 extern struct usb_interface *usb_find_interface(struct usb_driver *drv,
410 int minor);
411 extern struct usb_interface *usb_ifnum_to_if(struct usb_device *dev,
412 unsigned ifnum);
413 extern struct usb_host_interface *usb_altnum_to_altsetting(
414 struct usb_interface *intf, unsigned int altnum);
418 * usb_make_path - returns stable device path in the usb tree
419 * @dev: the device whose path is being constructed
420 * @buf: where to put the string
421 * @size: how big is "buf"?
423 * Returns length of the string (> 0) or negative if size was too small.
425 * This identifier is intended to be "stable", reflecting physical paths in
426 * hardware such as physical bus addresses for host controllers or ports on
427 * USB hubs. That makes it stay the same until systems are physically
428 * reconfigured, by re-cabling a tree of USB devices or by moving USB host
429 * controllers. Adding and removing devices, including virtual root hubs
430 * in host controller driver modules, does not change these path identifers;
431 * neither does rebooting or re-enumerating. These are more useful identifiers
432 * than changeable ("unstable") ones like bus numbers or device addresses.
434 * With a partial exception for devices connected to USB 2.0 root hubs, these
435 * identifiers are also predictable. So long as the device tree isn't changed,
436 * plugging any USB device into a given hub port always gives it the same path.
437 * Because of the use of "companion" controllers, devices connected to ports on
438 * USB 2.0 root hubs (EHCI host controllers) will get one path ID if they are
439 * high speed, and a different one if they are full or low speed.
441 static inline int usb_make_path (struct usb_device *dev, char *buf, size_t size)
443 int actual;
444 actual = snprintf (buf, size, "usb-%s-%s", dev->bus->bus_name, dev->devpath);
445 return (actual >= (int)size) ? -1 : actual;
448 /*-------------------------------------------------------------------------*/
450 #define USB_DEVICE_ID_MATCH_DEVICE (USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_PRODUCT)
451 #define USB_DEVICE_ID_MATCH_DEV_RANGE (USB_DEVICE_ID_MATCH_DEV_LO | USB_DEVICE_ID_MATCH_DEV_HI)
452 #define USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION (USB_DEVICE_ID_MATCH_DEVICE | USB_DEVICE_ID_MATCH_DEV_RANGE)
453 #define USB_DEVICE_ID_MATCH_DEV_INFO \
454 (USB_DEVICE_ID_MATCH_DEV_CLASS | USB_DEVICE_ID_MATCH_DEV_SUBCLASS | USB_DEVICE_ID_MATCH_DEV_PROTOCOL)
455 #define USB_DEVICE_ID_MATCH_INT_INFO \
456 (USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS | USB_DEVICE_ID_MATCH_INT_PROTOCOL)
459 * USB_DEVICE - macro used to describe a specific usb device
460 * @vend: the 16 bit USB Vendor ID
461 * @prod: the 16 bit USB Product ID
463 * This macro is used to create a struct usb_device_id that matches a
464 * specific device.
466 #define USB_DEVICE(vend,prod) \
467 .match_flags = USB_DEVICE_ID_MATCH_DEVICE, .idVendor = (vend), .idProduct = (prod)
469 * USB_DEVICE_VER - macro used to describe a specific usb device with a version range
470 * @vend: the 16 bit USB Vendor ID
471 * @prod: the 16 bit USB Product ID
472 * @lo: the bcdDevice_lo value
473 * @hi: the bcdDevice_hi value
475 * This macro is used to create a struct usb_device_id that matches a
476 * specific device, with a version range.
478 #define USB_DEVICE_VER(vend,prod,lo,hi) \
479 .match_flags = USB_DEVICE_ID_MATCH_DEVICE_AND_VERSION, .idVendor = (vend), .idProduct = (prod), .bcdDevice_lo = (lo), .bcdDevice_hi = (hi)
482 * USB_DEVICE_INFO - macro used to describe a class of usb devices
483 * @cl: bDeviceClass value
484 * @sc: bDeviceSubClass value
485 * @pr: bDeviceProtocol value
487 * This macro is used to create a struct usb_device_id that matches a
488 * specific class of devices.
490 #define USB_DEVICE_INFO(cl,sc,pr) \
491 .match_flags = USB_DEVICE_ID_MATCH_DEV_INFO, .bDeviceClass = (cl), .bDeviceSubClass = (sc), .bDeviceProtocol = (pr)
494 * USB_INTERFACE_INFO - macro used to describe a class of usb interfaces
495 * @cl: bInterfaceClass value
496 * @sc: bInterfaceSubClass value
497 * @pr: bInterfaceProtocol value
499 * This macro is used to create a struct usb_device_id that matches a
500 * specific class of interfaces.
502 #define USB_INTERFACE_INFO(cl,sc,pr) \
503 .match_flags = USB_DEVICE_ID_MATCH_INT_INFO, .bInterfaceClass = (cl), .bInterfaceSubClass = (sc), .bInterfaceProtocol = (pr)
505 /* -------------------------------------------------------------------------- */
508 * struct usb_driver - identifies USB driver to usbcore
509 * @owner: Pointer to the module owner of this driver; initialize
510 * it using THIS_MODULE.
511 * @name: The driver name should be unique among USB drivers,
512 * and should normally be the same as the module name.
513 * @probe: Called to see if the driver is willing to manage a particular
514 * interface on a device. If it is, probe returns zero and uses
515 * dev_set_drvdata() to associate driver-specific data with the
516 * interface. It may also use usb_set_interface() to specify the
517 * appropriate altsetting. If unwilling to manage the interface,
518 * return a negative errno value.
519 * @disconnect: Called when the interface is no longer accessible, usually
520 * because its device has been (or is being) disconnected or the
521 * driver module is being unloaded.
522 * @ioctl: Used for drivers that want to talk to userspace through
523 * the "usbfs" filesystem. This lets devices provide ways to
524 * expose information to user space regardless of where they
525 * do (or don't) show up otherwise in the filesystem.
526 * @suspend: Called when the device is going to be suspended by the system.
527 * @resume: Called when the device is being resumed by the system.
528 * @id_table: USB drivers use ID table to support hotplugging.
529 * Export this with MODULE_DEVICE_TABLE(usb,...). This must be set
530 * or your driver's probe function will never get called.
531 * @driver: the driver model core driver structure.
533 * USB drivers must provide a name, probe() and disconnect() methods,
534 * and an id_table. Other driver fields are optional.
536 * The id_table is used in hotplugging. It holds a set of descriptors,
537 * and specialized data may be associated with each entry. That table
538 * is used by both user and kernel mode hotplugging support.
540 * The probe() and disconnect() methods are called in a context where
541 * they can sleep, but they should avoid abusing the privilege. Most
542 * work to connect to a device should be done when the device is opened,
543 * and undone at the last close. The disconnect code needs to address
544 * concurrency issues with respect to open() and close() methods, as
545 * well as forcing all pending I/O requests to complete (by unlinking
546 * them as necessary, and blocking until the unlinks complete).
548 struct usb_driver {
549 struct module *owner;
551 const char *name;
553 int (*probe) (struct usb_interface *intf,
554 const struct usb_device_id *id);
556 void (*disconnect) (struct usb_interface *intf);
558 int (*ioctl) (struct usb_interface *intf, unsigned int code, void *buf);
560 int (*suspend) (struct usb_interface *intf, pm_message_t message);
561 int (*resume) (struct usb_interface *intf);
563 const struct usb_device_id *id_table;
565 struct device_driver driver;
567 #define to_usb_driver(d) container_of(d, struct usb_driver, driver)
569 extern struct bus_type usb_bus_type;
572 * struct usb_class_driver - identifies a USB driver that wants to use the USB major number
573 * @name: devfs name for this driver. Will also be used by the driver
574 * class code to create a usb class device.
575 * @fops: pointer to the struct file_operations of this driver.
576 * @mode: the mode for the devfs file to be created for this driver.
577 * @minor_base: the start of the minor range for this driver.
579 * This structure is used for the usb_register_dev() and
580 * usb_unregister_dev() functions, to consolidate a number of the
581 * parameters used for them.
583 struct usb_class_driver {
584 char *name;
585 struct file_operations *fops;
586 mode_t mode;
587 int minor_base;
591 * use these in module_init()/module_exit()
592 * and don't forget MODULE_DEVICE_TABLE(usb, ...)
594 extern int usb_register(struct usb_driver *);
595 extern void usb_deregister(struct usb_driver *);
597 extern int usb_register_dev(struct usb_interface *intf,
598 struct usb_class_driver *class_driver);
599 extern void usb_deregister_dev(struct usb_interface *intf,
600 struct usb_class_driver *class_driver);
602 extern int usb_disabled(void);
604 /* -------------------------------------------------------------------------- */
607 * URB support, for asynchronous request completions
611 * urb->transfer_flags:
613 #define URB_SHORT_NOT_OK 0x0001 /* report short reads as errors */
614 #define URB_ISO_ASAP 0x0002 /* iso-only, urb->start_frame ignored */
615 #define URB_NO_TRANSFER_DMA_MAP 0x0004 /* urb->transfer_dma valid on submit */
616 #define URB_NO_SETUP_DMA_MAP 0x0008 /* urb->setup_dma valid on submit */
617 #define URB_ASYNC_UNLINK 0x0010 /* usb_unlink_urb() returns asap */
618 #define URB_NO_FSBR 0x0020 /* UHCI-specific */
619 #define URB_ZERO_PACKET 0x0040 /* Finish bulk OUTs with short packet */
620 #define URB_NO_INTERRUPT 0x0080 /* HINT: no non-error interrupt needed */
622 struct usb_iso_packet_descriptor {
623 unsigned int offset;
624 unsigned int length; /* expected length */
625 unsigned int actual_length;
626 unsigned int status;
629 struct urb;
630 struct pt_regs;
632 typedef void (*usb_complete_t)(struct urb *, struct pt_regs *);
635 * struct urb - USB Request Block
636 * @urb_list: For use by current owner of the URB.
637 * @pipe: Holds endpoint number, direction, type, and more.
638 * Create these values with the eight macros available;
639 * usb_{snd,rcv}TYPEpipe(dev,endpoint), where the TYPE is "ctrl"
640 * (control), "bulk", "int" (interrupt), or "iso" (isochronous).
641 * For example usb_sndbulkpipe() or usb_rcvintpipe(). Endpoint
642 * numbers range from zero to fifteen. Note that "in" endpoint two
643 * is a different endpoint (and pipe) from "out" endpoint two.
644 * The current configuration controls the existence, type, and
645 * maximum packet size of any given endpoint.
646 * @dev: Identifies the USB device to perform the request.
647 * @status: This is read in non-iso completion functions to get the
648 * status of the particular request. ISO requests only use it
649 * to tell whether the URB was unlinked; detailed status for
650 * each frame is in the fields of the iso_frame-desc.
651 * @transfer_flags: A variety of flags may be used to affect how URB
652 * submission, unlinking, or operation are handled. Different
653 * kinds of URB can use different flags.
654 * @transfer_buffer: This identifies the buffer to (or from) which
655 * the I/O request will be performed (unless URB_NO_TRANSFER_DMA_MAP
656 * is set). This buffer must be suitable for DMA; allocate it with
657 * kmalloc() or equivalent. For transfers to "in" endpoints, contents
658 * of this buffer will be modified. This buffer is used for the data
659 * stage of control transfers.
660 * @transfer_dma: When transfer_flags includes URB_NO_TRANSFER_DMA_MAP,
661 * the device driver is saying that it provided this DMA address,
662 * which the host controller driver should use in preference to the
663 * transfer_buffer.
664 * @transfer_buffer_length: How big is transfer_buffer. The transfer may
665 * be broken up into chunks according to the current maximum packet
666 * size for the endpoint, which is a function of the configuration
667 * and is encoded in the pipe. When the length is zero, neither
668 * transfer_buffer nor transfer_dma is used.
669 * @actual_length: This is read in non-iso completion functions, and
670 * it tells how many bytes (out of transfer_buffer_length) were
671 * transferred. It will normally be the same as requested, unless
672 * either an error was reported or a short read was performed.
673 * The URB_SHORT_NOT_OK transfer flag may be used to make such
674 * short reads be reported as errors.
675 * @setup_packet: Only used for control transfers, this points to eight bytes
676 * of setup data. Control transfers always start by sending this data
677 * to the device. Then transfer_buffer is read or written, if needed.
678 * @setup_dma: For control transfers with URB_NO_SETUP_DMA_MAP set, the
679 * device driver has provided this DMA address for the setup packet.
680 * The host controller driver should use this in preference to
681 * setup_packet.
682 * @start_frame: Returns the initial frame for isochronous transfers.
683 * @number_of_packets: Lists the number of ISO transfer buffers.
684 * @interval: Specifies the polling interval for interrupt or isochronous
685 * transfers. The units are frames (milliseconds) for for full and low
686 * speed devices, and microframes (1/8 millisecond) for highspeed ones.
687 * @error_count: Returns the number of ISO transfers that reported errors.
688 * @context: For use in completion functions. This normally points to
689 * request-specific driver context.
690 * @complete: Completion handler. This URB is passed as the parameter to the
691 * completion function. The completion function may then do what
692 * it likes with the URB, including resubmitting or freeing it.
693 * @iso_frame_desc: Used to provide arrays of ISO transfer buffers and to
694 * collect the transfer status for each buffer.
696 * This structure identifies USB transfer requests. URBs must be allocated by
697 * calling usb_alloc_urb() and freed with a call to usb_free_urb().
698 * Initialization may be done using various usb_fill_*_urb() functions. URBs
699 * are submitted using usb_submit_urb(), and pending requests may be canceled
700 * using usb_unlink_urb() or usb_kill_urb().
702 * Data Transfer Buffers:
704 * Normally drivers provide I/O buffers allocated with kmalloc() or otherwise
705 * taken from the general page pool. That is provided by transfer_buffer
706 * (control requests also use setup_packet), and host controller drivers
707 * perform a dma mapping (and unmapping) for each buffer transferred. Those
708 * mapping operations can be expensive on some platforms (perhaps using a dma
709 * bounce buffer or talking to an IOMMU),
710 * although they're cheap on commodity x86 and ppc hardware.
712 * Alternatively, drivers may pass the URB_NO_xxx_DMA_MAP transfer flags,
713 * which tell the host controller driver that no such mapping is needed since
714 * the device driver is DMA-aware. For example, a device driver might
715 * allocate a DMA buffer with usb_buffer_alloc() or call usb_buffer_map().
716 * When these transfer flags are provided, host controller drivers will
717 * attempt to use the dma addresses found in the transfer_dma and/or
718 * setup_dma fields rather than determining a dma address themselves. (Note
719 * that transfer_buffer and setup_packet must still be set because not all
720 * host controllers use DMA, nor do virtual root hubs).
722 * Initialization:
724 * All URBs submitted must initialize the dev, pipe, transfer_flags (may be
725 * zero), and complete fields.
726 * The URB_ASYNC_UNLINK transfer flag affects later invocations of
727 * the usb_unlink_urb() routine. Note: Failure to set URB_ASYNC_UNLINK
728 * with usb_unlink_urb() is deprecated. For synchronous unlinks use
729 * usb_kill_urb() instead.
731 * All URBs must also initialize
732 * transfer_buffer and transfer_buffer_length. They may provide the
733 * URB_SHORT_NOT_OK transfer flag, indicating that short reads are
734 * to be treated as errors; that flag is invalid for write requests.
736 * Bulk URBs may
737 * use the URB_ZERO_PACKET transfer flag, indicating that bulk OUT transfers
738 * should always terminate with a short packet, even if it means adding an
739 * extra zero length packet.
741 * Control URBs must provide a setup_packet. The setup_packet and
742 * transfer_buffer may each be mapped for DMA or not, independently of
743 * the other. The transfer_flags bits URB_NO_TRANSFER_DMA_MAP and
744 * URB_NO_SETUP_DMA_MAP indicate which buffers have already been mapped.
745 * URB_NO_SETUP_DMA_MAP is ignored for non-control URBs.
747 * Interrupt URBs must provide an interval, saying how often (in milliseconds
748 * or, for highspeed devices, 125 microsecond units)
749 * to poll for transfers. After the URB has been submitted, the interval
750 * field reflects how the transfer was actually scheduled.
751 * The polling interval may be more frequent than requested.
752 * For example, some controllers have a maximum interval of 32 milliseconds,
753 * while others support intervals of up to 1024 milliseconds.
754 * Isochronous URBs also have transfer intervals. (Note that for isochronous
755 * endpoints, as well as high speed interrupt endpoints, the encoding of
756 * the transfer interval in the endpoint descriptor is logarithmic.
757 * Device drivers must convert that value to linear units themselves.)
759 * Isochronous URBs normally use the URB_ISO_ASAP transfer flag, telling
760 * the host controller to schedule the transfer as soon as bandwidth
761 * utilization allows, and then set start_frame to reflect the actual frame
762 * selected during submission. Otherwise drivers must specify the start_frame
763 * and handle the case where the transfer can't begin then. However, drivers
764 * won't know how bandwidth is currently allocated, and while they can
765 * find the current frame using usb_get_current_frame_number () they can't
766 * know the range for that frame number. (Ranges for frame counter values
767 * are HC-specific, and can go from 256 to 65536 frames from "now".)
769 * Isochronous URBs have a different data transfer model, in part because
770 * the quality of service is only "best effort". Callers provide specially
771 * allocated URBs, with number_of_packets worth of iso_frame_desc structures
772 * at the end. Each such packet is an individual ISO transfer. Isochronous
773 * URBs are normally queued, submitted by drivers to arrange that
774 * transfers are at least double buffered, and then explicitly resubmitted
775 * in completion handlers, so
776 * that data (such as audio or video) streams at as constant a rate as the
777 * host controller scheduler can support.
779 * Completion Callbacks:
781 * The completion callback is made in_interrupt(), and one of the first
782 * things that a completion handler should do is check the status field.
783 * The status field is provided for all URBs. It is used to report
784 * unlinked URBs, and status for all non-ISO transfers. It should not
785 * be examined before the URB is returned to the completion handler.
787 * The context field is normally used to link URBs back to the relevant
788 * driver or request state.
790 * When the completion callback is invoked for non-isochronous URBs, the
791 * actual_length field tells how many bytes were transferred. This field
792 * is updated even when the URB terminated with an error or was unlinked.
794 * ISO transfer status is reported in the status and actual_length fields
795 * of the iso_frame_desc array, and the number of errors is reported in
796 * error_count. Completion callbacks for ISO transfers will normally
797 * (re)submit URBs to ensure a constant transfer rate.
799 * Note that even fields marked "public" should not be touched by the driver
800 * when the urb is owned by the hcd, that is, since the call to
801 * usb_submit_urb() till the entry into the completion routine.
803 struct urb
805 /* private, usb core and host controller only fields in the urb */
806 struct kref kref; /* reference count of the URB */
807 spinlock_t lock; /* lock for the URB */
808 void *hcpriv; /* private data for host controller */
809 int bandwidth; /* bandwidth for INT/ISO request */
810 atomic_t use_count; /* concurrent submissions counter */
811 u8 reject; /* submissions will fail */
813 /* public, documented fields in the urb that can be used by drivers */
814 struct list_head urb_list; /* list head for use by the urb owner */
815 struct usb_device *dev; /* (in) pointer to associated device */
816 unsigned int pipe; /* (in) pipe information */
817 int status; /* (return) non-ISO status */
818 unsigned int transfer_flags; /* (in) URB_SHORT_NOT_OK | ...*/
819 void *transfer_buffer; /* (in) associated data buffer */
820 dma_addr_t transfer_dma; /* (in) dma addr for transfer_buffer */
821 int transfer_buffer_length; /* (in) data buffer length */
822 int actual_length; /* (return) actual transfer length */
823 unsigned char *setup_packet; /* (in) setup packet (control only) */
824 dma_addr_t setup_dma; /* (in) dma addr for setup_packet */
825 int start_frame; /* (modify) start frame (ISO) */
826 int number_of_packets; /* (in) number of ISO packets */
827 int interval; /* (modify) transfer interval (INT/ISO) */
828 int error_count; /* (return) number of ISO errors */
829 void *context; /* (in) context for completion */
830 usb_complete_t complete; /* (in) completion routine */
831 struct usb_iso_packet_descriptor iso_frame_desc[0]; /* (in) ISO ONLY */
834 /* -------------------------------------------------------------------------- */
837 * usb_fill_control_urb - initializes a control urb
838 * @urb: pointer to the urb to initialize.
839 * @dev: pointer to the struct usb_device for this urb.
840 * @pipe: the endpoint pipe
841 * @setup_packet: pointer to the setup_packet buffer
842 * @transfer_buffer: pointer to the transfer buffer
843 * @buffer_length: length of the transfer buffer
844 * @complete: pointer to the usb_complete_t function
845 * @context: what to set the urb context to.
847 * Initializes a control urb with the proper information needed to submit
848 * it to a device.
850 static inline void usb_fill_control_urb (struct urb *urb,
851 struct usb_device *dev,
852 unsigned int pipe,
853 unsigned char *setup_packet,
854 void *transfer_buffer,
855 int buffer_length,
856 usb_complete_t complete,
857 void *context)
859 spin_lock_init(&urb->lock);
860 urb->dev = dev;
861 urb->pipe = pipe;
862 urb->setup_packet = setup_packet;
863 urb->transfer_buffer = transfer_buffer;
864 urb->transfer_buffer_length = buffer_length;
865 urb->complete = complete;
866 urb->context = context;
870 * usb_fill_bulk_urb - macro to help initialize a bulk urb
871 * @urb: pointer to the urb to initialize.
872 * @dev: pointer to the struct usb_device for this urb.
873 * @pipe: the endpoint pipe
874 * @transfer_buffer: pointer to the transfer buffer
875 * @buffer_length: length of the transfer buffer
876 * @complete: pointer to the usb_complete_t function
877 * @context: what to set the urb context to.
879 * Initializes a bulk urb with the proper information needed to submit it
880 * to a device.
882 static inline void usb_fill_bulk_urb (struct urb *urb,
883 struct usb_device *dev,
884 unsigned int pipe,
885 void *transfer_buffer,
886 int buffer_length,
887 usb_complete_t complete,
888 void *context)
890 spin_lock_init(&urb->lock);
891 urb->dev = dev;
892 urb->pipe = pipe;
893 urb->transfer_buffer = transfer_buffer;
894 urb->transfer_buffer_length = buffer_length;
895 urb->complete = complete;
896 urb->context = context;
900 * usb_fill_int_urb - macro to help initialize a interrupt urb
901 * @urb: pointer to the urb to initialize.
902 * @dev: pointer to the struct usb_device for this urb.
903 * @pipe: the endpoint pipe
904 * @transfer_buffer: pointer to the transfer buffer
905 * @buffer_length: length of the transfer buffer
906 * @complete: pointer to the usb_complete_t function
907 * @context: what to set the urb context to.
908 * @interval: what to set the urb interval to, encoded like
909 * the endpoint descriptor's bInterval value.
911 * Initializes a interrupt urb with the proper information needed to submit
912 * it to a device.
913 * Note that high speed interrupt endpoints use a logarithmic encoding of
914 * the endpoint interval, and express polling intervals in microframes
915 * (eight per millisecond) rather than in frames (one per millisecond).
917 static inline void usb_fill_int_urb (struct urb *urb,
918 struct usb_device *dev,
919 unsigned int pipe,
920 void *transfer_buffer,
921 int buffer_length,
922 usb_complete_t complete,
923 void *context,
924 int interval)
926 spin_lock_init(&urb->lock);
927 urb->dev = dev;
928 urb->pipe = pipe;
929 urb->transfer_buffer = transfer_buffer;
930 urb->transfer_buffer_length = buffer_length;
931 urb->complete = complete;
932 urb->context = context;
933 if (dev->speed == USB_SPEED_HIGH)
934 urb->interval = 1 << (interval - 1);
935 else
936 urb->interval = interval;
937 urb->start_frame = -1;
940 extern void usb_init_urb(struct urb *urb);
941 extern struct urb *usb_alloc_urb(int iso_packets, int mem_flags);
942 extern void usb_free_urb(struct urb *urb);
943 #define usb_put_urb usb_free_urb
944 extern struct urb *usb_get_urb(struct urb *urb);
945 extern int usb_submit_urb(struct urb *urb, int mem_flags);
946 extern int usb_unlink_urb(struct urb *urb);
947 extern void usb_kill_urb(struct urb *urb);
949 #define HAVE_USB_BUFFERS
950 void *usb_buffer_alloc (struct usb_device *dev, size_t size,
951 int mem_flags, dma_addr_t *dma);
952 void usb_buffer_free (struct usb_device *dev, size_t size,
953 void *addr, dma_addr_t dma);
955 #if 0
956 struct urb *usb_buffer_map (struct urb *urb);
957 void usb_buffer_dmasync (struct urb *urb);
958 void usb_buffer_unmap (struct urb *urb);
959 #endif
961 struct scatterlist;
962 int usb_buffer_map_sg (struct usb_device *dev, unsigned pipe,
963 struct scatterlist *sg, int nents);
964 #if 0
965 void usb_buffer_dmasync_sg (struct usb_device *dev, unsigned pipe,
966 struct scatterlist *sg, int n_hw_ents);
967 #endif
968 void usb_buffer_unmap_sg (struct usb_device *dev, unsigned pipe,
969 struct scatterlist *sg, int n_hw_ents);
971 /*-------------------------------------------------------------------*
972 * SYNCHRONOUS CALL SUPPORT *
973 *-------------------------------------------------------------------*/
975 extern int usb_control_msg(struct usb_device *dev, unsigned int pipe,
976 __u8 request, __u8 requesttype, __u16 value, __u16 index,
977 void *data, __u16 size, int timeout);
978 extern int usb_bulk_msg(struct usb_device *usb_dev, unsigned int pipe,
979 void *data, int len, int *actual_length,
980 int timeout);
982 /* selective suspend/resume */
983 extern int usb_suspend_device(struct usb_device *dev, pm_message_t message);
984 extern int usb_resume_device(struct usb_device *dev);
987 /* wrappers around usb_control_msg() for the most common standard requests */
988 extern int usb_get_descriptor(struct usb_device *dev, unsigned char desctype,
989 unsigned char descindex, void *buf, int size);
990 extern int usb_get_status(struct usb_device *dev,
991 int type, int target, void *data);
992 extern int usb_get_string(struct usb_device *dev,
993 unsigned short langid, unsigned char index, void *buf, int size);
994 extern int usb_string(struct usb_device *dev, int index,
995 char *buf, size_t size);
997 /* wrappers that also update important state inside usbcore */
998 extern int usb_clear_halt(struct usb_device *dev, int pipe);
999 extern int usb_reset_configuration(struct usb_device *dev);
1000 extern int usb_set_interface(struct usb_device *dev, int ifnum, int alternate);
1003 * timeouts, in milliseconds, used for sending/receiving control messages
1004 * they typically complete within a few frames (msec) after they're issued
1005 * USB identifies 5 second timeouts, maybe more in a few cases, and a few
1006 * slow devices (like some MGE Ellipse UPSes) actually push that limit.
1008 #define USB_CTRL_GET_TIMEOUT 5000
1009 #define USB_CTRL_SET_TIMEOUT 5000
1013 * struct usb_sg_request - support for scatter/gather I/O
1014 * @status: zero indicates success, else negative errno
1015 * @bytes: counts bytes transferred.
1017 * These requests are initialized using usb_sg_init(), and then are used
1018 * as request handles passed to usb_sg_wait() or usb_sg_cancel(). Most
1019 * members of the request object aren't for driver access.
1021 * The status and bytecount values are valid only after usb_sg_wait()
1022 * returns. If the status is zero, then the bytecount matches the total
1023 * from the request.
1025 * After an error completion, drivers may need to clear a halt condition
1026 * on the endpoint.
1028 struct usb_sg_request {
1029 int status;
1030 size_t bytes;
1033 * members below are private to usbcore,
1034 * and are not provided for driver access!
1036 spinlock_t lock;
1038 struct usb_device *dev;
1039 int pipe;
1040 struct scatterlist *sg;
1041 int nents;
1043 int entries;
1044 struct urb **urbs;
1046 int count;
1047 struct completion complete;
1050 int usb_sg_init (
1051 struct usb_sg_request *io,
1052 struct usb_device *dev,
1053 unsigned pipe,
1054 unsigned period,
1055 struct scatterlist *sg,
1056 int nents,
1057 size_t length,
1058 int mem_flags
1060 void usb_sg_cancel (struct usb_sg_request *io);
1061 void usb_sg_wait (struct usb_sg_request *io);
1064 /* -------------------------------------------------------------------------- */
1067 * For various legacy reasons, Linux has a small cookie that's paired with
1068 * a struct usb_device to identify an endpoint queue. Queue characteristics
1069 * are defined by the endpoint's descriptor. This cookie is called a "pipe",
1070 * an unsigned int encoded as:
1072 * - direction: bit 7 (0 = Host-to-Device [Out],
1073 * 1 = Device-to-Host [In] ...
1074 * like endpoint bEndpointAddress)
1075 * - device address: bits 8-14 ... bit positions known to uhci-hcd
1076 * - endpoint: bits 15-18 ... bit positions known to uhci-hcd
1077 * - pipe type: bits 30-31 (00 = isochronous, 01 = interrupt,
1078 * 10 = control, 11 = bulk)
1080 * Given the device address and endpoint descriptor, pipes are redundant.
1083 /* NOTE: these are not the standard USB_ENDPOINT_XFER_* values!! */
1084 /* (yet ... they're the values used by usbfs) */
1085 #define PIPE_ISOCHRONOUS 0
1086 #define PIPE_INTERRUPT 1
1087 #define PIPE_CONTROL 2
1088 #define PIPE_BULK 3
1090 #define usb_pipein(pipe) ((pipe) & USB_DIR_IN)
1091 #define usb_pipeout(pipe) (!usb_pipein(pipe))
1093 #define usb_pipedevice(pipe) (((pipe) >> 8) & 0x7f)
1094 #define usb_pipeendpoint(pipe) (((pipe) >> 15) & 0xf)
1096 #define usb_pipetype(pipe) (((pipe) >> 30) & 3)
1097 #define usb_pipeisoc(pipe) (usb_pipetype((pipe)) == PIPE_ISOCHRONOUS)
1098 #define usb_pipeint(pipe) (usb_pipetype((pipe)) == PIPE_INTERRUPT)
1099 #define usb_pipecontrol(pipe) (usb_pipetype((pipe)) == PIPE_CONTROL)
1100 #define usb_pipebulk(pipe) (usb_pipetype((pipe)) == PIPE_BULK)
1102 /* The D0/D1 toggle bits ... USE WITH CAUTION (they're almost hcd-internal) */
1103 #define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> (ep)) & 1)
1104 #define usb_dotoggle(dev, ep, out) ((dev)->toggle[out] ^= (1 << (ep)))
1105 #define usb_settoggle(dev, ep, out, bit) ((dev)->toggle[out] = ((dev)->toggle[out] & ~(1 << (ep))) | ((bit) << (ep)))
1108 static inline unsigned int __create_pipe(struct usb_device *dev, unsigned int endpoint)
1110 return (dev->devnum << 8) | (endpoint << 15);
1113 /* Create various pipes... */
1114 #define usb_sndctrlpipe(dev,endpoint) ((PIPE_CONTROL << 30) | __create_pipe(dev,endpoint))
1115 #define usb_rcvctrlpipe(dev,endpoint) ((PIPE_CONTROL << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN)
1116 #define usb_sndisocpipe(dev,endpoint) ((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev,endpoint))
1117 #define usb_rcvisocpipe(dev,endpoint) ((PIPE_ISOCHRONOUS << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN)
1118 #define usb_sndbulkpipe(dev,endpoint) ((PIPE_BULK << 30) | __create_pipe(dev,endpoint))
1119 #define usb_rcvbulkpipe(dev,endpoint) ((PIPE_BULK << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN)
1120 #define usb_sndintpipe(dev,endpoint) ((PIPE_INTERRUPT << 30) | __create_pipe(dev,endpoint))
1121 #define usb_rcvintpipe(dev,endpoint) ((PIPE_INTERRUPT << 30) | __create_pipe(dev,endpoint) | USB_DIR_IN)
1123 /*-------------------------------------------------------------------------*/
1125 static inline __u16
1126 usb_maxpacket(struct usb_device *udev, int pipe, int is_out)
1128 struct usb_host_endpoint *ep;
1129 unsigned epnum = usb_pipeendpoint(pipe);
1131 if (is_out) {
1132 WARN_ON(usb_pipein(pipe));
1133 ep = udev->ep_out[epnum];
1134 } else {
1135 WARN_ON(usb_pipeout(pipe));
1136 ep = udev->ep_in[epnum];
1138 if (!ep)
1139 return 0;
1141 /* NOTE: only 0x07ff bits are for packet size... */
1142 return le16_to_cpu(ep->desc.wMaxPacketSize);
1145 /* -------------------------------------------------------------------------- */
1147 #ifdef DEBUG
1148 #define dbg(format, arg...) printk(KERN_DEBUG "%s: " format "\n" , __FILE__ , ## arg)
1149 #else
1150 #define dbg(format, arg...) do {} while (0)
1151 #endif
1153 #define err(format, arg...) printk(KERN_ERR "%s: " format "\n" , __FILE__ , ## arg)
1154 #define info(format, arg...) printk(KERN_INFO "%s: " format "\n" , __FILE__ , ## arg)
1155 #define warn(format, arg...) printk(KERN_WARNING "%s: " format "\n" , __FILE__ , ## arg)
1158 #endif /* __KERNEL__ */
1160 #endif