2 * Copyright (c) 2001-2002 by David Brownell
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms of the GNU General Public License as published by the
6 * Free Software Foundation; either version 2 of the License, or (at your
7 * option) any later version.
9 * This program is distributed in the hope that it will be useful, but
10 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
11 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software Foundation,
16 * Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 #ifndef __USB_CORE_HCD_H
20 #define __USB_CORE_HCD_H
24 #include <linux/rwsem.h>
26 #define MAX_TOPO_LEVEL 6
28 /* This file contains declarations of usbcore internals that are mostly
29 * used or exposed by Host Controller Drivers.
33 * USB Packet IDs (PIDs)
35 #define USB_PID_EXT 0xf0 /* USB 2.0 LPM ECN */
36 #define USB_PID_OUT 0xe1
37 #define USB_PID_ACK 0xd2
38 #define USB_PID_DATA0 0xc3
39 #define USB_PID_PING 0xb4 /* USB 2.0 */
40 #define USB_PID_SOF 0xa5
41 #define USB_PID_NYET 0x96 /* USB 2.0 */
42 #define USB_PID_DATA2 0x87 /* USB 2.0 */
43 #define USB_PID_SPLIT 0x78 /* USB 2.0 */
44 #define USB_PID_IN 0x69
45 #define USB_PID_NAK 0x5a
46 #define USB_PID_DATA1 0x4b
47 #define USB_PID_PREAMBLE 0x3c /* Token mode */
48 #define USB_PID_ERR 0x3c /* USB 2.0: handshake mode */
49 #define USB_PID_SETUP 0x2d
50 #define USB_PID_STALL 0x1e
51 #define USB_PID_MDATA 0x0f /* USB 2.0 */
53 /*-------------------------------------------------------------------------*/
56 * USB Host Controller Driver (usb_hcd) framework
58 * Since "struct usb_bus" is so thin, you can't share much code in it.
59 * This framework is a layer over that, and should be more sharable.
61 * @authorized_default: Specifies if new devices are authorized to
62 * connect by default or they require explicit
63 * user space authorization; this bit is settable
64 * through /sys/class/usb_host/X/authorized_default.
65 * For the rest is RO, so we don't lock to r/w it.
68 /*-------------------------------------------------------------------------*/
75 struct usb_bus self; /* hcd is-a bus */
76 struct kref kref; /* reference counter */
78 const char *product_desc; /* product/vendor string */
79 char irq_descr[24]; /* driver + bus # */
81 struct timer_list rh_timer; /* drives root-hub polling */
82 struct urb *status_urb; /* the current status urb */
83 #ifdef CONFIG_USB_SUSPEND
84 struct work_struct wakeup_work; /* for remote wakeup */
90 const struct hc_driver *driver; /* hw-specific hooks */
92 /* Flags that need to be manipulated atomically */
94 #define HCD_FLAG_HW_ACCESSIBLE 0x00000001
95 #define HCD_FLAG_SAW_IRQ 0x00000002
97 unsigned rh_registered:1;/* is root hub registered? */
98 unsigned rh_pollable:1; /* may we poll the root hub? */
100 /* The next flag is a stopgap, to be removed when all the HCDs
101 * support the new root-hub polling mechanism. */
102 unsigned uses_new_polling:1;
103 unsigned poll_rh:1; /* poll for rh status? */
104 unsigned poll_pending:1; /* status has changed? */
105 unsigned wireless:1; /* Wireless USB HCD */
106 unsigned authorized_default:1;
107 unsigned has_tt:1; /* Integrated TT in root hub */
109 int irq; /* irq allocated */
110 void __iomem *regs; /* device memory/io */
111 u64 rsrc_start; /* memory/io resource start */
112 u64 rsrc_len; /* memory/io resource length */
113 unsigned power_budget; /* in mA, 0 = no limit */
115 /* bandwidth_mutex should be taken before adding or removing
116 * any new bus bandwidth constraints:
117 * 1. Before adding a configuration for a new device.
118 * 2. Before removing the configuration to put the device into
119 * the addressed state.
120 * 3. Before selecting a different configuration.
121 * 4. Before selecting an alternate interface setting.
123 * bandwidth_mutex should be dropped after a successful control message
124 * to the device, or resetting the bandwidth after a failed attempt.
126 struct mutex bandwidth_mutex;
129 #define HCD_BUFFER_POOLS 4
130 struct dma_pool *pool[HCD_BUFFER_POOLS];
133 # define __ACTIVE 0x01
134 # define __SUSPEND 0x04
135 # define __TRANSIENT 0x80
137 # define HC_STATE_HALT 0
138 # define HC_STATE_RUNNING (__ACTIVE)
139 # define HC_STATE_QUIESCING (__SUSPEND|__TRANSIENT|__ACTIVE)
140 # define HC_STATE_RESUMING (__SUSPEND|__TRANSIENT)
141 # define HC_STATE_SUSPENDED (__SUSPEND)
143 #define HC_IS_RUNNING(state) ((state) & __ACTIVE)
144 #define HC_IS_SUSPENDED(state) ((state) & __SUSPEND)
146 /* more shared queuing code would be good; it should support
147 * smarter scheduling, handle transaction translators, etc;
148 * input size of periodic table to an interrupt scheduler.
149 * (ohci 32, uhci 1024, ehci 256/512/1024).
152 /* The HC driver's private data is stored at the end of
155 unsigned long hcd_priv[0]
156 __attribute__ ((aligned(sizeof(unsigned long))));
159 /* 2.4 does this a bit differently ... */
160 static inline struct usb_bus *hcd_to_bus(struct usb_hcd *hcd)
165 static inline struct usb_hcd *bus_to_hcd(struct usb_bus *bus)
167 return container_of(bus, struct usb_hcd, self);
170 struct hcd_timeout { /* timeouts we allocate */
171 struct list_head timeout_list;
172 struct timer_list timer;
175 /*-------------------------------------------------------------------------*/
179 const char *description; /* "ehci-hcd" etc */
180 const char *product_desc; /* product/vendor string */
181 size_t hcd_priv_size; /* size of private data */
184 irqreturn_t (*irq) (struct usb_hcd *hcd);
187 #define HCD_MEMORY 0x0001 /* HC regs use memory (else I/O) */
188 #define HCD_LOCAL_MEM 0x0002 /* HC needs local memory */
189 #define HCD_USB11 0x0010 /* USB 1.1 */
190 #define HCD_USB2 0x0020 /* USB 2.0 */
191 #define HCD_USB3 0x0040 /* USB 3.0 */
192 #define HCD_MASK 0x0070
194 /* called to init HCD and root hub */
195 int (*reset) (struct usb_hcd *hcd);
196 int (*start) (struct usb_hcd *hcd);
198 /* NOTE: these suspend/resume calls relate to the HC as
199 * a whole, not just the root hub; they're for PCI bus glue.
201 /* called after suspending the hub, before entering D3 etc */
202 int (*pci_suspend)(struct usb_hcd *hcd);
204 /* called after entering D0 (etc), before resuming the hub */
205 int (*pci_resume)(struct usb_hcd *hcd, bool hibernated);
207 /* cleanly make HCD stop writing memory and doing I/O */
208 void (*stop) (struct usb_hcd *hcd);
211 void (*shutdown) (struct usb_hcd *hcd);
213 /* return current frame number */
214 int (*get_frame_number) (struct usb_hcd *hcd);
216 /* manage i/o requests, device state */
217 int (*urb_enqueue)(struct usb_hcd *hcd,
218 struct urb *urb, gfp_t mem_flags);
219 int (*urb_dequeue)(struct usb_hcd *hcd,
220 struct urb *urb, int status);
222 /* hw synch, freeing endpoint resources that urb_dequeue can't */
223 void (*endpoint_disable)(struct usb_hcd *hcd,
224 struct usb_host_endpoint *ep);
226 /* (optional) reset any endpoint state such as sequence number
227 and current window */
228 void (*endpoint_reset)(struct usb_hcd *hcd,
229 struct usb_host_endpoint *ep);
231 /* root hub support */
232 int (*hub_status_data) (struct usb_hcd *hcd, char *buf);
233 int (*hub_control) (struct usb_hcd *hcd,
234 u16 typeReq, u16 wValue, u16 wIndex,
235 char *buf, u16 wLength);
236 int (*bus_suspend)(struct usb_hcd *);
237 int (*bus_resume)(struct usb_hcd *);
238 int (*start_port_reset)(struct usb_hcd *, unsigned port_num);
240 /* force handover of high-speed port to full-speed companion */
241 void (*relinquish_port)(struct usb_hcd *, int);
242 /* has a port been handed over to a companion? */
243 int (*port_handed_over)(struct usb_hcd *, int);
245 /* CLEAR_TT_BUFFER completion callback */
246 void (*clear_tt_buffer_complete)(struct usb_hcd *,
247 struct usb_host_endpoint *);
249 /* xHCI specific functions */
250 /* Called by usb_alloc_dev to alloc HC device structures */
251 int (*alloc_dev)(struct usb_hcd *, struct usb_device *);
252 /* Called by usb_disconnect to free HC device structures */
253 void (*free_dev)(struct usb_hcd *, struct usb_device *);
254 /* Change a group of bulk endpoints to support multiple stream IDs */
255 int (*alloc_streams)(struct usb_hcd *hcd, struct usb_device *udev,
256 struct usb_host_endpoint **eps, unsigned int num_eps,
257 unsigned int num_streams, gfp_t mem_flags);
258 /* Reverts a group of bulk endpoints back to not using stream IDs.
259 * Can fail if we run out of memory.
261 int (*free_streams)(struct usb_hcd *hcd, struct usb_device *udev,
262 struct usb_host_endpoint **eps, unsigned int num_eps,
265 /* Bandwidth computation functions */
266 /* Note that add_endpoint() can only be called once per endpoint before
267 * check_bandwidth() or reset_bandwidth() must be called.
268 * drop_endpoint() can only be called once per endpoint also.
269 * A call to xhci_drop_endpoint() followed by a call to
270 * xhci_add_endpoint() will add the endpoint to the schedule with
271 * possibly new parameters denoted by a different endpoint descriptor
272 * in usb_host_endpoint. A call to xhci_add_endpoint() followed by a
273 * call to xhci_drop_endpoint() is not allowed.
275 /* Allocate endpoint resources and add them to a new schedule */
276 int (*add_endpoint)(struct usb_hcd *, struct usb_device *,
277 struct usb_host_endpoint *);
278 /* Drop an endpoint from a new schedule */
279 int (*drop_endpoint)(struct usb_hcd *, struct usb_device *,
280 struct usb_host_endpoint *);
281 /* Check that a new hardware configuration, set using
282 * endpoint_enable and endpoint_disable, does not exceed bus
283 * bandwidth. This must be called before any set configuration
284 * or set interface requests are sent to the device.
286 int (*check_bandwidth)(struct usb_hcd *, struct usb_device *);
287 /* Reset the device schedule to the last known good schedule,
288 * which was set from a previous successful call to
289 * check_bandwidth(). This reverts any add_endpoint() and
290 * drop_endpoint() calls since that last successful call.
291 * Used for when a check_bandwidth() call fails due to resource
292 * or bandwidth constraints.
294 void (*reset_bandwidth)(struct usb_hcd *, struct usb_device *);
295 /* Returns the hardware-chosen device address */
296 int (*address_device)(struct usb_hcd *, struct usb_device *udev);
297 /* Notifies the HCD after a hub descriptor is fetched.
300 int (*update_hub_device)(struct usb_hcd *, struct usb_device *hdev,
301 struct usb_tt *tt, gfp_t mem_flags);
302 int (*reset_device)(struct usb_hcd *, struct usb_device *);
305 extern int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb);
306 extern int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb,
308 extern void usb_hcd_unlink_urb_from_ep(struct usb_hcd *hcd, struct urb *urb);
310 extern int usb_hcd_submit_urb(struct urb *urb, gfp_t mem_flags);
311 extern int usb_hcd_unlink_urb(struct urb *urb, int status);
312 extern void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb,
314 extern void usb_hcd_flush_endpoint(struct usb_device *udev,
315 struct usb_host_endpoint *ep);
316 extern void usb_hcd_disable_endpoint(struct usb_device *udev,
317 struct usb_host_endpoint *ep);
318 extern void usb_hcd_reset_endpoint(struct usb_device *udev,
319 struct usb_host_endpoint *ep);
320 extern void usb_hcd_synchronize_unlinks(struct usb_device *udev);
321 extern int usb_hcd_alloc_bandwidth(struct usb_device *udev,
322 struct usb_host_config *new_config,
323 struct usb_host_interface *old_alt,
324 struct usb_host_interface *new_alt);
325 extern int usb_hcd_get_frame_number(struct usb_device *udev);
327 extern struct usb_hcd *usb_create_hcd(const struct hc_driver *driver,
328 struct device *dev, const char *bus_name);
329 extern struct usb_hcd *usb_get_hcd(struct usb_hcd *hcd);
330 extern void usb_put_hcd(struct usb_hcd *hcd);
331 extern int usb_add_hcd(struct usb_hcd *hcd,
332 unsigned int irqnum, unsigned long irqflags);
333 extern void usb_remove_hcd(struct usb_hcd *hcd);
335 struct platform_device;
336 extern void usb_hcd_platform_shutdown(struct platform_device *dev);
340 struct pci_device_id;
341 extern int usb_hcd_pci_probe(struct pci_dev *dev,
342 const struct pci_device_id *id);
343 extern void usb_hcd_pci_remove(struct pci_dev *dev);
344 extern void usb_hcd_pci_shutdown(struct pci_dev *dev);
346 #ifdef CONFIG_PM_SLEEP
347 extern const struct dev_pm_ops usb_hcd_pci_pm_ops;
349 #endif /* CONFIG_PCI */
351 /* pci-ish (pdev null is ok) buffer alloc/mapping support */
352 int hcd_buffer_create(struct usb_hcd *hcd);
353 void hcd_buffer_destroy(struct usb_hcd *hcd);
355 void *hcd_buffer_alloc(struct usb_bus *bus, size_t size,
356 gfp_t mem_flags, dma_addr_t *dma);
357 void hcd_buffer_free(struct usb_bus *bus, size_t size,
358 void *addr, dma_addr_t dma);
360 /* generic bus glue, needed for host controllers that don't use PCI */
361 extern irqreturn_t usb_hcd_irq(int irq, void *__hcd);
363 extern void usb_hc_died(struct usb_hcd *hcd);
364 extern void usb_hcd_poll_rh_status(struct usb_hcd *hcd);
366 /* The D0/D1 toggle bits ... USE WITH CAUTION (they're almost hcd-internal) */
367 #define usb_gettoggle(dev, ep, out) (((dev)->toggle[out] >> (ep)) & 1)
368 #define usb_dotoggle(dev, ep, out) ((dev)->toggle[out] ^= (1 << (ep)))
369 #define usb_settoggle(dev, ep, out, bit) \
370 ((dev)->toggle[out] = ((dev)->toggle[out] & ~(1 << (ep))) | \
373 /* -------------------------------------------------------------------------- */
375 /* Enumeration is only for the hub driver, or HCD virtual root hubs */
376 extern struct usb_device *usb_alloc_dev(struct usb_device *parent,
377 struct usb_bus *, unsigned port);
378 extern int usb_new_device(struct usb_device *dev);
379 extern void usb_disconnect(struct usb_device **);
381 extern int usb_get_configuration(struct usb_device *dev);
382 extern void usb_destroy_configuration(struct usb_device *dev);
384 /*-------------------------------------------------------------------------*/
387 * HCD Root Hub support
390 #include <linux/usb/ch11.h>
393 * As of USB 2.0, full/low speed devices are segregated into trees.
394 * One type grows from USB 1.1 host controllers (OHCI, UHCI etc).
395 * The other type grows from high speed hubs when they connect to
396 * full/low speed devices using "Transaction Translators" (TTs).
398 * TTs should only be known to the hub driver, and high speed bus
399 * drivers (only EHCI for now). They affect periodic scheduling and
400 * sometimes control/bulk error recovery.
406 struct usb_device *hub; /* upstream highspeed hub */
407 int multi; /* true means one TT per port */
408 unsigned think_time; /* think time in ns */
410 /* for control/bulk error recovery (CLEAR_TT_BUFFER) */
412 struct list_head clear_list; /* of usb_tt_clear */
413 struct work_struct clear_work;
416 struct usb_tt_clear {
417 struct list_head clear_list;
421 struct usb_host_endpoint *ep;
424 extern int usb_hub_clear_tt_buffer(struct urb *urb);
425 extern void usb_ep0_reinit(struct usb_device *);
427 /* (shifted) direction/type/recipient from the USB 2.0 spec, table 9.2 */
428 #define DeviceRequest \
429 ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
430 #define DeviceOutRequest \
431 ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_DEVICE)<<8)
433 #define InterfaceRequest \
434 ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
436 #define EndpointRequest \
437 ((USB_DIR_IN|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
438 #define EndpointOutRequest \
439 ((USB_DIR_OUT|USB_TYPE_STANDARD|USB_RECIP_INTERFACE)<<8)
441 /* class requests from the USB 2.0 hub spec, table 11-15 */
442 /* GetBusState and SetHubDescriptor are optional, omitted */
443 #define ClearHubFeature (0x2000 | USB_REQ_CLEAR_FEATURE)
444 #define ClearPortFeature (0x2300 | USB_REQ_CLEAR_FEATURE)
445 #define GetHubDescriptor (0xa000 | USB_REQ_GET_DESCRIPTOR)
446 #define GetHubStatus (0xa000 | USB_REQ_GET_STATUS)
447 #define GetPortStatus (0xa300 | USB_REQ_GET_STATUS)
448 #define SetHubFeature (0x2000 | USB_REQ_SET_FEATURE)
449 #define SetPortFeature (0x2300 | USB_REQ_SET_FEATURE)
452 /*-------------------------------------------------------------------------*/
455 * Generic bandwidth allocation constants/support
457 #define FRAME_TIME_USECS 1000L
458 #define BitTime(bytecount) (7 * 8 * bytecount / 6) /* with integer truncation */
459 /* Trying not to use worst-case bit-stuffing
460 * of (7/6 * 8 * bytecount) = 9.33 * bytecount */
461 /* bytecount = data payload byte count */
463 #define NS_TO_US(ns) ((ns + 500L) / 1000L)
464 /* convert & round nanoseconds to microseconds */
468 * Full/low speed bandwidth allocation constants/support.
470 #define BW_HOST_DELAY 1000L /* nanoseconds */
471 #define BW_HUB_LS_SETUP 333L /* nanoseconds */
472 /* 4 full-speed bit times (est.) */
474 #define FRAME_TIME_BITS 12000L /* frame = 1 millisecond */
475 #define FRAME_TIME_MAX_BITS_ALLOC (90L * FRAME_TIME_BITS / 100L)
476 #define FRAME_TIME_MAX_USECS_ALLOC (90L * FRAME_TIME_USECS / 100L)
479 * Ceiling [nano/micro]seconds (typical) for that many bytes at high speed
480 * ISO is a bit less, no ACK ... from USB 2.0 spec, 5.11.3 (and needed
481 * to preallocate bandwidth)
483 #define USB2_HOST_DELAY 5 /* nsec, guess */
484 #define HS_NSECS(bytes) (((55 * 8 * 2083) \
485 + (2083UL * (3 + BitTime(bytes))))/1000 \
487 #define HS_NSECS_ISO(bytes) (((38 * 8 * 2083) \
488 + (2083UL * (3 + BitTime(bytes))))/1000 \
490 #define HS_USECS(bytes) NS_TO_US(HS_NSECS(bytes))
491 #define HS_USECS_ISO(bytes) NS_TO_US(HS_NSECS_ISO(bytes))
493 extern long usb_calc_bus_time(int speed, int is_input,
494 int isoc, int bytecount);
496 /*-------------------------------------------------------------------------*/
498 extern void usb_set_device_state(struct usb_device *udev,
499 enum usb_device_state new_state);
501 /*-------------------------------------------------------------------------*/
503 /* exported only within usbcore */
505 extern struct list_head usb_bus_list;
506 extern struct mutex usb_bus_list_lock;
507 extern wait_queue_head_t usb_kill_urb_queue;
509 extern int usb_find_interface_driver(struct usb_device *dev,
510 struct usb_interface *interface);
512 #define usb_endpoint_out(ep_dir) (!((ep_dir) & USB_DIR_IN))
515 extern void usb_root_hub_lost_power(struct usb_device *rhdev);
516 extern int hcd_bus_suspend(struct usb_device *rhdev, pm_message_t msg);
517 extern int hcd_bus_resume(struct usb_device *rhdev, pm_message_t msg);
518 #endif /* CONFIG_PM */
520 #ifdef CONFIG_USB_SUSPEND
521 extern void usb_hcd_resume_root_hub(struct usb_hcd *hcd);
523 static inline void usb_hcd_resume_root_hub(struct usb_hcd *hcd)
527 #endif /* CONFIG_USB_SUSPEND */
531 * USB device fs stuff
534 #ifdef CONFIG_USB_DEVICEFS
537 * these are expected to be called from the USB core/hub thread
538 * with the kernel lock held
540 extern void usbfs_update_special(void);
541 extern int usbfs_init(void);
542 extern void usbfs_cleanup(void);
544 #else /* CONFIG_USB_DEVICEFS */
546 static inline void usbfs_update_special(void) {}
547 static inline int usbfs_init(void) { return 0; }
548 static inline void usbfs_cleanup(void) { }
550 #endif /* CONFIG_USB_DEVICEFS */
552 /*-------------------------------------------------------------------------*/
554 #if defined(CONFIG_USB_MON) || defined(CONFIG_USB_MON_MODULE)
556 struct usb_mon_operations {
557 void (*urb_submit)(struct usb_bus *bus, struct urb *urb);
558 void (*urb_submit_error)(struct usb_bus *bus, struct urb *urb, int err);
559 void (*urb_complete)(struct usb_bus *bus, struct urb *urb, int status);
560 /* void (*urb_unlink)(struct usb_bus *bus, struct urb *urb); */
563 extern struct usb_mon_operations *mon_ops;
565 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb)
568 (*mon_ops->urb_submit)(bus, urb);
571 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
575 (*mon_ops->urb_submit_error)(bus, urb, error);
578 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
582 (*mon_ops->urb_complete)(bus, urb, status);
585 int usb_mon_register(struct usb_mon_operations *ops);
586 void usb_mon_deregister(void);
590 static inline void usbmon_urb_submit(struct usb_bus *bus, struct urb *urb) {}
591 static inline void usbmon_urb_submit_error(struct usb_bus *bus, struct urb *urb,
593 static inline void usbmon_urb_complete(struct usb_bus *bus, struct urb *urb,
596 #endif /* CONFIG_USB_MON || CONFIG_USB_MON_MODULE */
598 /*-------------------------------------------------------------------------*/
600 /* hub.h ... DeviceRemovable in 2.4.2-ac11, gone in 2.4.10 */
601 /* bleech -- resurfaced in 2.4.11 or 2.4.12 */
602 #define bitmap DeviceRemovable
605 /*-------------------------------------------------------------------------*/
609 #define RUN_CONTEXT (in_irq() ? "in_irq" \
610 : (in_interrupt() ? "in_interrupt" : "can sleep"))
613 /* This rwsem is for use only by the hub driver and ehci-hcd.
614 * Nobody else should touch it.
616 extern struct rw_semaphore ehci_cf_port_reset_rwsem;
618 /* Keep track of which host controller drivers are loaded */
619 #define USB_UHCI_LOADED 0
620 #define USB_OHCI_LOADED 1
621 #define USB_EHCI_LOADED 2
622 extern unsigned long usb_hcds_loaded;
624 #endif /* __KERNEL__ */
626 #endif /* __USB_CORE_HCD_H */