1/* $Id: parport.h,v 1.1.1.1 2008/10/15 03:29:27 james26_jang Exp $ */
2
3/*
4 * Any part of this program may be used in documents licensed under
5 * the GNU Free Documentation License, Version 1.1 or any later version
6 * published by the Free Software Foundation.
7 */
8
9#ifndef _PARPORT_H_
10#define _PARPORT_H_
11
12/* Start off with user-visible constants */
13
14/* Maximum of 16 ports per machine */
15#define PARPORT_MAX  16
16
17/* Magic numbers */
18#define PARPORT_IRQ_NONE  -1
19#define PARPORT_DMA_NONE  -1
20#define PARPORT_IRQ_AUTO  -2
21#define PARPORT_DMA_AUTO  -2
22#define PARPORT_DMA_NOFIFO -3
23#define PARPORT_DISABLE   -2
24#define PARPORT_IRQ_PROBEONLY -3
25#define PARPORT_IOHI_AUTO -1
26
27#define PARPORT_CONTROL_STROBE    0x1
28#define PARPORT_CONTROL_AUTOFD    0x2
29#define PARPORT_CONTROL_INIT      0x4
30#define PARPORT_CONTROL_SELECT    0x8
31
32#define PARPORT_STATUS_ERROR      0x8
33#define PARPORT_STATUS_SELECT     0x10
34#define PARPORT_STATUS_PAPEROUT   0x20
35#define PARPORT_STATUS_ACK        0x40
36#define PARPORT_STATUS_BUSY       0x80
37
38/* Type classes for Plug-and-Play probe.  */
39typedef enum {
40	PARPORT_CLASS_LEGACY = 0,       /* Non-IEEE1284 device */
41	PARPORT_CLASS_PRINTER,
42	PARPORT_CLASS_MODEM,
43	PARPORT_CLASS_NET,
44	PARPORT_CLASS_HDC,              /* Hard disk controller */
45	PARPORT_CLASS_PCMCIA,
46	PARPORT_CLASS_MEDIA,            /* Multimedia device */
47	PARPORT_CLASS_FDC,              /* Floppy disk controller */
48	PARPORT_CLASS_PORTS,
49	PARPORT_CLASS_SCANNER,
50	PARPORT_CLASS_DIGCAM,
51	PARPORT_CLASS_OTHER,            /* Anything else */
52	PARPORT_CLASS_UNSPEC,           /* No CLS field in ID */
53	PARPORT_CLASS_SCSIADAPTER
54} parport_device_class;
55
56/* The "modes" entry in parport is a bit field representing the
57   capabilities of the hardware. */
58#define PARPORT_MODE_PCSPP	(1<<0) /* IBM PC registers available. */
59#define PARPORT_MODE_TRISTATE	(1<<1) /* Can tristate. */
60#define PARPORT_MODE_EPP	(1<<2) /* Hardware EPP. */
61#define PARPORT_MODE_ECP	(1<<3) /* Hardware ECP. */
62#define PARPORT_MODE_COMPAT	(1<<4) /* Hardware 'printer protocol'. */
63#define PARPORT_MODE_DMA	(1<<5) /* Hardware can DMA. */
64#define PARPORT_MODE_SAFEININT	(1<<6) /* SPP registers accessible in IRQ. */
65
66/* IEEE1284 modes:
67   Nibble mode, byte mode, ECP, ECPRLE and EPP are their own
68   'extensibility request' values.  Others are special.
69   'Real' ECP modes must have the IEEE1284_MODE_ECP bit set.  */
70#define IEEE1284_MODE_NIBBLE             0
71#define IEEE1284_MODE_BYTE              (1<<0)
72#define IEEE1284_MODE_COMPAT            (1<<8)
73#define IEEE1284_MODE_BECP              (1<<9) /* Bounded ECP mode */
74#define IEEE1284_MODE_ECP               (1<<4)
75#define IEEE1284_MODE_ECPRLE            (IEEE1284_MODE_ECP | (1<<5))
76#define IEEE1284_MODE_ECPSWE            (1<<10) /* Software-emulated */
77#define IEEE1284_MODE_EPP               (1<<6)
78#define IEEE1284_MODE_EPPSL             (1<<11) /* EPP 1.7 */
79#define IEEE1284_MODE_EPPSWE            (1<<12) /* Software-emulated */
80#define IEEE1284_DEVICEID               (1<<2)  /* This is a flag */
81#define IEEE1284_EXT_LINK               (1<<14) /* This flag causes the
82						 * extensibility link to
83						 * be requested, using
84						 * bits 0-6. */
85
86/* For the benefit of parport_read/write, you can use these with
87 * parport_negotiate to use address operations.  They have no effect
88 * other than to make parport_read/write use address transfers. */
89#define IEEE1284_ADDR			(1<<13)	/* This is a flag */
90#define IEEE1284_DATA			 0	/* So is this */
91
92/* Flags for block transfer operations. */
93#define PARPORT_EPP_FAST		(1<<0) /* Unreliable counts. */
94#define PARPORT_W91284PIC		(1<<1) /* have a Warp9 w91284pic in the device */
95
96/* The rest is for the kernel only */
97#ifdef __KERNEL__
98
99#include <linux/wait.h>
100#include <linux/spinlock.h>
101#include <asm/system.h>
102#include <asm/ptrace.h>
103#include <asm/semaphore.h>
104#include <linux/proc_fs.h>
105#include <linux/config.h>
106
107#define PARPORT_NEED_GENERIC_OPS
108
109/* Define this later. */
110struct parport;
111struct pardevice;
112
113struct pc_parport_state {
114	unsigned int ctr;
115	unsigned int ecr;
116};
117
118struct ax_parport_state {
119	unsigned int ctr;
120	unsigned int ecr;
121	unsigned int dcsr;
122};
123
124/* used by both parport_amiga and parport_mfc3 */
125struct amiga_parport_state {
126       unsigned char data;     /* ciaa.prb */
127       unsigned char datadir;  /* ciaa.ddrb */
128       unsigned char status;   /* ciab.pra & 7 */
129       unsigned char statusdir;/* ciab.ddrb & 7 */
130};
131
132struct parport_state {
133	union {
134		struct pc_parport_state pc;
135		/* ARC has no state. */
136		struct ax_parport_state ax;
137		struct amiga_parport_state amiga;
138		/* Atari has not state. */
139		void *misc;
140	} u;
141};
142
143struct parport_operations {
144	/* IBM PC-style virtual registers. */
145	void (*write_data)(struct parport *, unsigned char);
146	unsigned char (*read_data)(struct parport *);
147
148	void (*write_control)(struct parport *, unsigned char);
149	unsigned char (*read_control)(struct parport *);
150	unsigned char (*frob_control)(struct parport *, unsigned char mask,
151				      unsigned char val);
152
153	unsigned char (*read_status)(struct parport *);
154
155	/* IRQs. */
156	void (*enable_irq)(struct parport *);
157	void (*disable_irq)(struct parport *);
158
159	/* Data direction. */
160	void (*data_forward) (struct parport *);
161	void (*data_reverse) (struct parport *);
162
163	/* For core parport code. */
164	void (*init_state)(struct pardevice *, struct parport_state *);
165	void (*save_state)(struct parport *, struct parport_state *);
166	void (*restore_state)(struct parport *, struct parport_state *);
167
168	void (*inc_use_count)(void);
169	void (*dec_use_count)(void);
170
171	/* Block read/write */
172	size_t (*epp_write_data) (struct parport *port, const void *buf,
173				  size_t len, int flags);
174	size_t (*epp_read_data) (struct parport *port, void *buf, size_t len,
175				 int flags);
176	size_t (*epp_write_addr) (struct parport *port, const void *buf,
177				  size_t len, int flags);
178	size_t (*epp_read_addr) (struct parport *port, void *buf, size_t len,
179				 int flags);
180
181	size_t (*ecp_write_data) (struct parport *port, const void *buf,
182				  size_t len, int flags);
183	size_t (*ecp_read_data) (struct parport *port, void *buf, size_t len,
184				 int flags);
185	size_t (*ecp_write_addr) (struct parport *port, const void *buf,
186				  size_t len, int flags);
187
188	size_t (*compat_write_data) (struct parport *port, const void *buf,
189				     size_t len, int flags);
190	size_t (*nibble_read_data) (struct parport *port, void *buf,
191				    size_t len, int flags);
192	size_t (*byte_read_data) (struct parport *port, void *buf,
193				  size_t len, int flags);
194};
195
196struct parport_device_info {
197	parport_device_class class;
198	const char *class_name;
199	const char *mfr;
200	const char *model;
201	const char *cmdset;
202	const char *description;
203};
204
205/* Each device can have two callback functions:
206 *  1) a preemption function, called by the resource manager to request
207 *     that the driver relinquish control of the port.  The driver should
208 *     return zero if it agrees to release the port, and nonzero if it
209 *     refuses.  Do not call parport_release() - the kernel will do this
210 *     implicitly.
211 *
212 *  2) a wake-up function, called by the resource manager to tell drivers
213 *     that the port is available to be claimed.  If a driver wants to use
214 *     the port, it should call parport_claim() here.
215 */
216
217/* A parallel port device */
218struct pardevice {
219	const char *name;
220	struct parport *port;
221	int daisy;
222	int (*preempt)(void *);
223	void (*wakeup)(void *);
224	void *private;
225	void (*irq_func)(int, void *, struct pt_regs *);
226	unsigned int flags;
227	struct pardevice *next;
228	struct pardevice *prev;
229	struct parport_state *state;     /* saved status over preemption */
230	wait_queue_head_t wait_q;
231	unsigned long int time;
232	unsigned long int timeslice;
233	volatile long int timeout;
234	unsigned long waiting;		 /* long req'd for set_bit --RR */
235	struct pardevice *waitprev;
236	struct pardevice *waitnext;
237	void * sysctl_table;
238};
239
240/* IEEE1284 information */
241
242/* IEEE1284 phases */
243enum ieee1284_phase {
244	IEEE1284_PH_FWD_DATA,
245	IEEE1284_PH_FWD_IDLE,
246	IEEE1284_PH_TERMINATE,
247	IEEE1284_PH_NEGOTIATION,
248	IEEE1284_PH_HBUSY_DNA,
249	IEEE1284_PH_REV_IDLE,
250	IEEE1284_PH_HBUSY_DAVAIL,
251	IEEE1284_PH_REV_DATA,
252	IEEE1284_PH_ECP_SETUP,
253	IEEE1284_PH_ECP_FWD_TO_REV,
254	IEEE1284_PH_ECP_REV_TO_FWD,
255	IEEE1284_PH_ECP_DIR_UNKNOWN,
256};
257struct ieee1284_info {
258	int mode;
259	volatile enum ieee1284_phase phase;
260	struct semaphore irq;
261};
262
263/* A parallel port */
264struct parport {
265	unsigned long base;	/* base address */
266	unsigned long base_hi;  /* base address (hi - ECR) */
267	unsigned int size;	/* IO extent */
268	const char *name;
269	unsigned int modes;
270	int irq;		/* interrupt (or -1 for none) */
271	int dma;
272	int muxport;		/* which muxport (if any) this is */
273	int portnum;		/* which physical parallel port (not mux) */
274
275	struct parport *physport;
276				/* If this is a non-default mux
277				   parport, i.e. we're a clone of a real
278				   physical port, this is a pointer to that
279				   port. The locking is only done in the
280				   real port.  For a clone port, the
281				   following structure members are
282				   meaningless: devices, cad, muxsel,
283				   waithead, waittail, flags, pdir,
284				   ieee1284, *_lock.
285
286				   It this is a default mux parport, or
287				   there is no mux involved, this points to
288				   ourself. */
289
290	struct pardevice *devices;
291	struct pardevice *cad;	/* port owner */
292	int daisy;		/* currently selected daisy addr */
293	int muxsel;		/* currently selected mux port */
294
295	struct pardevice *waithead;
296	struct pardevice *waittail;
297
298	struct parport *next;
299	unsigned int flags;
300
301	void *sysctl_table;
302	struct parport_device_info probe_info[5]; /* 0-3 + non-IEEE1284.3 */
303	struct ieee1284_info ieee1284;
304
305	struct parport_operations *ops;
306	void *private_data;     /* for lowlevel driver */
307
308	int number;		/* port index - the `n' in `parportn' */
309	spinlock_t pardevice_lock;
310	spinlock_t waitlist_lock;
311	rwlock_t cad_lock;
312
313	int spintime;
314	atomic_t ref_count;
315};
316
317#define DEFAULT_SPIN_TIME 500 /* us */
318
319struct parport_driver {
320	const char *name;
321	void (*attach) (struct parport *);
322	void (*detach) (struct parport *);
323	struct parport_driver *next;
324};
325
326/* parport_register_port registers a new parallel port at the given
327   address (if one does not already exist) and returns a pointer to it.
328   This entails claiming the I/O region, IRQ and DMA.  NULL is returned
329   if initialisation fails. */
330struct parport *parport_register_port(unsigned long base, int irq, int dma,
331				      struct parport_operations *ops);
332
333/* Once a registered port is ready for high-level drivers to use, the
334   low-level driver that registered it should announce it.  This will
335   call the high-level drivers' attach() functions (after things like
336   determining the IEEE 1284.3 topology of the port and collecting
337   DeviceIDs). */
338void parport_announce_port (struct parport *port);
339
340/* Unregister a port. */
341extern void parport_unregister_port(struct parport *port);
342
343/* parport_enumerate returns a pointer to the linked list of all the
344   ports in this machine.  DON'T USE THIS.  Use
345   parport_register_driver instead. */
346struct parport *parport_enumerate(void);
347
348/* Register a new high-level driver. */
349extern int parport_register_driver (struct parport_driver *);
350
351/* Unregister a high-level driver. */
352extern void parport_unregister_driver (struct parport_driver *);
353
354/* If parport_register_driver doesn't fit your needs, perhaps
355 * parport_find_xxx does. */
356extern struct parport *parport_find_number (int);
357extern struct parport *parport_find_base (unsigned long);
358
359/* Reference counting for ports. */
360extern struct parport *parport_get_port (struct parport *);
361extern void parport_put_port (struct parport *);
362
363/* parport_register_device declares that a device is connected to a
364   port, and tells the kernel all it needs to know.
365   - pf is the preemption function (may be NULL for no callback)
366   - kf is the wake-up function (may be NULL for no callback)
367   - irq_func is the interrupt handler (may be NULL for no interrupts)
368   - handle is a user pointer that gets handed to callback functions.  */
369struct pardevice *parport_register_device(struct parport *port,
370			  const char *name,
371			  int (*pf)(void *), void (*kf)(void *),
372			  void (*irq_func)(int, void *, struct pt_regs *),
373			  int flags, void *handle);
374
375/* parport_unregister unlinks a device from the chain. */
376extern void parport_unregister_device(struct pardevice *dev);
377
378/* parport_claim tries to gain ownership of the port for a particular
379   driver.  This may fail (return non-zero) if another driver is busy.
380   If this driver has registered an interrupt handler, it will be
381   enabled.  */
382extern int parport_claim(struct pardevice *dev);
383
384/* parport_claim_or_block is the same, but sleeps if the port cannot
385   be claimed.  Return value is 1 if it slept, 0 normally and -errno
386   on error.  */
387extern int parport_claim_or_block(struct pardevice *dev);
388
389/* parport_release reverses a previous parport_claim.  This can never
390   fail, though the effects are undefined (except that they are bad)
391   if you didn't previously own the port.  Once you have released the
392   port you should make sure that neither your code nor the hardware
393   on the port tries to initiate any communication without first
394   re-claiming the port.  If you mess with the port state (enabling
395   ECP for example) you should clean up before releasing the port. */
396
397extern void parport_release(struct pardevice *dev);
398
399/**
400 * parport_yield - relinquish a parallel port temporarily
401 * @dev: a device on the parallel port
402 *
403 * This function relinquishes the port if it would be helpful to other
404 * drivers to do so.  Afterwards it tries to reclaim the port using
405 * parport_claim(), and the return value is the same as for
406 * parport_claim().  If it fails, the port is left unclaimed and it is
407 * the driver's responsibility to reclaim the port.
408 *
409 * The parport_yield() and parport_yield_blocking() functions are for
410 * marking points in the driver at which other drivers may claim the
411 * port and use their devices.  Yielding the port is similar to
412 * releasing it and reclaiming it, but is more efficient because no
413 * action is taken if there are no other devices needing the port.  In
414 * fact, nothing is done even if there are other devices waiting but
415 * the current device is still within its "timeslice".  The default
416 * timeslice is half a second, but it can be adjusted via the /proc
417 * interface.
418 **/
419static __inline__ int parport_yield(struct pardevice *dev)
420{
421	unsigned long int timeslip = (jiffies - dev->time);
422	if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
423		return 0;
424	parport_release(dev);
425	return parport_claim(dev);
426}
427
428/**
429 * parport_yield_blocking - relinquish a parallel port temporarily
430 * @dev: a device on the parallel port
431 *
432 * This function relinquishes the port if it would be helpful to other
433 * drivers to do so.  Afterwards it tries to reclaim the port using
434 * parport_claim_or_block(), and the return value is the same as for
435 * parport_claim_or_block().
436 **/
437static __inline__ int parport_yield_blocking(struct pardevice *dev)
438{
439	unsigned long int timeslip = (jiffies - dev->time);
440	if ((dev->port->waithead == NULL) || (timeslip < dev->timeslice))
441		return 0;
442	parport_release(dev);
443	return parport_claim_or_block(dev);
444}
445
446/* Flags used to identify what a device does. */
447#define PARPORT_DEV_TRAN		0	/* WARNING !! DEPRECATED !! */
448#define PARPORT_DEV_LURK		(1<<0)	/* WARNING !! DEPRECATED !! */
449#define PARPORT_DEV_EXCL		(1<<1)	/* Need exclusive access. */
450
451#define PARPORT_FLAG_EXCL		(1<<1)	/* EXCL driver registered. */
452
453extern int parport_parse_irqs(int, const char *[], int irqval[]);
454extern int parport_parse_dmas(int, const char *[], int dmaval[]);
455
456/* IEEE1284 functions */
457extern void parport_ieee1284_interrupt (int, void *, struct pt_regs *);
458extern int parport_negotiate (struct parport *, int mode);
459extern ssize_t parport_write (struct parport *, const void *buf, size_t len);
460extern ssize_t parport_read (struct parport *, void *buf, size_t len);
461
462#define PARPORT_INACTIVITY_O_NONBLOCK 1
463extern long parport_set_timeout (struct pardevice *, long inactivity);
464
465extern int parport_wait_event (struct parport *, long timeout);
466extern int parport_wait_peripheral (struct parport *port,
467				    unsigned char mask,
468				    unsigned char val);
469extern int parport_poll_peripheral (struct parport *port,
470				    unsigned char mask,
471				    unsigned char val,
472				    int usec);
473
474/* For architectural drivers */
475extern void parport_ieee1284_wakeup (struct parport *port);
476extern size_t parport_ieee1284_write_compat (struct parport *,
477					     const void *, size_t, int);
478extern size_t parport_ieee1284_read_nibble (struct parport *,
479					    void *, size_t, int);
480extern size_t parport_ieee1284_read_byte (struct parport *,
481					  void *, size_t, int);
482extern size_t parport_ieee1284_ecp_read_data (struct parport *,
483					      void *, size_t, int);
484extern size_t parport_ieee1284_ecp_write_data (struct parport *,
485					       const void *, size_t, int);
486extern size_t parport_ieee1284_ecp_write_addr (struct parport *,
487					       const void *, size_t, int);
488extern size_t parport_ieee1284_epp_write_data (struct parport *,
489					       const void *, size_t, int);
490extern size_t parport_ieee1284_epp_read_data (struct parport *,
491					      void *, size_t, int);
492extern size_t parport_ieee1284_epp_write_addr (struct parport *,
493					       const void *, size_t, int);
494extern size_t parport_ieee1284_epp_read_addr (struct parport *,
495					      void *, size_t, int);
496
497/* IEEE1284.3 functions */
498extern int parport_daisy_init (struct parport *port);
499extern void parport_daisy_fini (struct parport *port);
500extern struct pardevice *parport_open (int devnum, const char *name,
501				       int (*pf) (void *),
502				       void (*kf) (void *),
503				       void (*irqf) (int, void *,
504						     struct pt_regs *),
505				       int flags, void *handle);
506extern void parport_close (struct pardevice *dev);
507extern ssize_t parport_device_id (int devnum, char *buffer, size_t len);
508extern int parport_device_num (int parport, int mux, int daisy);
509extern int parport_device_coords (int devnum, int *parport, int *mux,
510				  int *daisy);
511extern void parport_daisy_deselect_all (struct parport *port);
512extern int parport_daisy_select (struct parport *port, int daisy, int mode);
513
514/* For finding devices based on their device ID.  Example usage:
515   int devnum = -1;
516   while ((devnum = parport_find_class (PARPORT_CLASS_DIGCAM, devnum)) != -1) {
517       struct pardevice *dev = parport_open (devnum, ...);
518       ...
519   }
520*/
521extern int parport_find_device (const char *mfg, const char *mdl, int from);
522extern int parport_find_class (parport_device_class cls, int from);
523
524/* Lowlevel drivers _can_ call this support function to handle irqs.  */
525static __inline__ void parport_generic_irq(int irq, struct parport *port,
526					   struct pt_regs *regs)
527{
528	parport_ieee1284_interrupt (irq, port, regs);
529	read_lock(&port->cad_lock);
530	if (port->cad && port->cad->irq_func)
531		port->cad->irq_func(irq, port->cad->private, regs);
532	read_unlock(&port->cad_lock);
533}
534
535/* Prototypes from parport_procfs */
536extern int parport_proc_register(struct parport *pp);
537extern int parport_proc_unregister(struct parport *pp);
538extern int parport_device_proc_register(struct pardevice *device);
539extern int parport_device_proc_unregister(struct pardevice *device);
540extern int parport_default_proc_register(void);
541extern int parport_default_proc_unregister(void);
542
543extern void dec_parport_count(void);
544extern void inc_parport_count(void);
545
546/* If PC hardware is the only type supported, we can optimise a bit.  */
547#if (defined(CONFIG_PARPORT_PC) || defined(CONFIG_PARPORT_PC_MODULE)) && !(defined(CONFIG_PARPORT_ARC) || defined(CONFIG_PARPORT_ARC_MODULE)) && !(defined(CONFIG_PARPORT_AMIGA) || defined(CONFIG_PARPORT_AMIGA_MODULE)) && !(defined(CONFIG_PARPORT_MFC3) || defined(CONFIG_PARPORT_MFC3_MODULE)) && !(defined(CONFIG_PARPORT_ATARI) || defined(CONFIG_PARPORT_ATARI_MODULE)) && !(defined(CONFIG_USB_USS720) || defined(CONFIG_USB_USS720_MODULE)) && !(defined(CONFIG_PARPORT_SUNBPP) || defined(CONFIG_PARPORT_SUNBPP_MODULE)) && !(defined(CONFIG_PARPORT_GSC) || defined(CONFIG_PARPORT_GSC_MODULE)) && !defined(CONFIG_PARPORT_OTHER)
548
549#undef PARPORT_NEED_GENERIC_OPS
550#include <linux/parport_pc.h>
551#define parport_write_data(p,x)            parport_pc_write_data(p,x)
552#define parport_read_data(p)               parport_pc_read_data(p)
553#define parport_write_control(p,x)         parport_pc_write_control(p,x)
554#define parport_read_control(p)            parport_pc_read_control(p)
555#define parport_frob_control(p,m,v)        parport_pc_frob_control(p,m,v)
556#define parport_read_status(p)             parport_pc_read_status(p)
557#define parport_enable_irq(p)              parport_pc_enable_irq(p)
558#define parport_disable_irq(p)             parport_pc_disable_irq(p)
559#define parport_data_forward(p)            parport_pc_data_forward(p)
560#define parport_data_reverse(p)            parport_pc_data_reverse(p)
561#endif
562
563#ifdef PARPORT_NEED_GENERIC_OPS
564/* Generic operations vector through the dispatch table. */
565#define parport_write_data(p,x)            (p)->ops->write_data(p,x)
566#define parport_read_data(p)               (p)->ops->read_data(p)
567#define parport_write_control(p,x)         (p)->ops->write_control(p,x)
568#define parport_read_control(p)            (p)->ops->read_control(p)
569#define parport_frob_control(p,m,v)        (p)->ops->frob_control(p,m,v)
570#define parport_read_status(p)             (p)->ops->read_status(p)
571#define parport_enable_irq(p)              (p)->ops->enable_irq(p)
572#define parport_disable_irq(p)             (p)->ops->disable_irq(p)
573#define parport_data_forward(p)            (p)->ops->data_forward(p)
574#define parport_data_reverse(p)            (p)->ops->data_reverse(p)
575#endif
576
577#endif /* __KERNEL__ */
578#endif /* _PARPORT_H_ */
579