1/*
2 * ADM5120 HCD (Host Controller Driver) for USB
3 *
4 * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
5 *
6 * This file was derived from: drivers/usb/host/ohci-dbg.c
7 *   (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
8 *   (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
9 *
10 *  This program is free software; you can redistribute it and/or modify it
11 *  under the terms of the GNU General Public License version 2 as published
12 *  by the Free Software Foundation.
13 *
14 */
15
16/*-------------------------------------------------------------------------*/
17
18static inline char *ed_typestring(int ed_type)
19{
20	switch (ed_type) {
21	case PIPE_CONTROL:
22		return "ctrl";
23	case PIPE_BULK:
24		return "bulk";
25	case PIPE_INTERRUPT:
26		return "intr";
27	case PIPE_ISOCHRONOUS:
28		return "isoc";
29	}
30	return "(bad ed_type)";
31}
32
33static inline char *ed_statestring(int state)
34{
35	switch (state) {
36	case ED_IDLE:
37		return "IDLE";
38	case ED_UNLINK:
39		return "UNLINK";
40	case ED_OPER:
41		return "OPER";
42	}
43	return "?STATE";
44}
45
46static inline char *pipestring(int pipe)
47{
48	return ed_typestring(usb_pipetype(pipe));
49}
50
51static inline char *td_pidstring(u32 info)
52{
53	switch (info & TD_DP) {
54	case TD_DP_SETUP:
55		return "SETUP";
56	case TD_DP_IN:
57		return "IN";
58	case TD_DP_OUT:
59		return "OUT";
60	}
61	return "?PID";
62}
63
64static inline char *td_togglestring(u32 info)
65{
66	switch (info & TD_T) {
67	case TD_T_DATA0:
68		return "DATA0";
69	case TD_T_DATA1:
70		return "DATA1";
71	case TD_T_CARRY:
72		return "CARRY";
73	}
74	return "?TOGGLE";
75}
76
77/*-------------------------------------------------------------------------*/
78
79#ifdef DEBUG
80
81/* debug| print the main components of an URB
82 * small: 0) header + data packets 1) just header
83 */
84static void __attribute__((unused))
85urb_print(struct admhcd *ahcd, struct urb *urb, char *str, int small, int status)
86{
87	unsigned int pipe = urb->pipe;
88
89	if (!urb->dev || !urb->dev->bus) {
90		admhc_dbg(ahcd, "%s URB: no dev", str);
91		return;
92	}
93
94#ifndef	ADMHC_VERBOSE_DEBUG
95	if (status != 0)
96#endif
97	admhc_dbg(ahcd, "URB-%s %p dev=%d ep=%d%s-%s flags=%x len=%d/%d "
98			"stat=%d\n",
99			str,
100			urb,
101			usb_pipedevice(pipe),
102			usb_pipeendpoint(pipe),
103			usb_pipeout(pipe) ? "out" : "in",
104			pipestring(pipe),
105			urb->transfer_flags,
106			urb->actual_length,
107			urb->transfer_buffer_length,
108			status);
109
110#ifdef	ADMHC_VERBOSE_DEBUG
111	if (!small) {
112		int i, len;
113
114		if (usb_pipecontrol(pipe)) {
115			admhc_dbg(ahcd, "setup(8):");
116			for (i = 0; i < 8 ; i++)
117				printk(KERN_INFO" %02x", ((__u8 *)urb->setup_packet)[i]);
118			printk(KERN_INFO "\n");
119		}
120		if (urb->transfer_buffer_length > 0 && urb->transfer_buffer) {
121			admhc_dbg(ahcd, "data(%d/%d):",
122				urb->actual_length,
123				urb->transfer_buffer_length);
124			len = usb_pipeout(pipe) ?
125						urb->transfer_buffer_length : urb->actual_length;
126			for (i = 0; i < 16 && i < len; i++)
127				printk(KERN_INFO " %02x", ((__u8 *)urb->transfer_buffer)[i]);
128			printk(KERN_INFO "%s stat:%d\n", i < len ? "..." : "", status);
129		}
130	}
131#endif /* ADMHC_VERBOSE_DEBUG */
132}
133
134#define admhc_dbg_sw(ahcd, next, size, format, arg...) \
135	do { \
136		if (next) { \
137			unsigned s_len; \
138			s_len = scnprintf(*next, *size, format, ## arg); \
139			*size -= s_len; *next += s_len; \
140		} else \
141			admhc_dbg(ahcd, format, ## arg); \
142	} while (0);
143
144
145static void admhc_dump_intr_mask(struct admhcd *ahcd, char *label, u32 mask,
146		char **next, unsigned *size)
147{
148	admhc_dbg_sw(ahcd, next, size, "%s 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n",
149		label,
150		mask,
151		(mask & ADMHC_INTR_INTA) ? " INTA" : "",
152		(mask & ADMHC_INTR_FATI) ? " FATI" : "",
153		(mask & ADMHC_INTR_SWI) ? " SWI" : "",
154		(mask & ADMHC_INTR_TDC) ? " TDC" : "",
155		(mask & ADMHC_INTR_FNO) ? " FNO" : "",
156		(mask & ADMHC_INTR_SO) ? " SO" : "",
157		(mask & ADMHC_INTR_INSM) ? " INSM" : "",
158		(mask & ADMHC_INTR_BABI) ? " BABI" : "",
159		(mask & ADMHC_INTR_7) ? " !7!" : "",
160		(mask & ADMHC_INTR_6) ? " !6!" : "",
161		(mask & ADMHC_INTR_RESI) ? " RESI" : "",
162		(mask & ADMHC_INTR_SOFI) ? " SOFI" : ""
163		);
164}
165
166static void maybe_print_eds(struct admhcd *ahcd, char *label, u32 value,
167		char **next, unsigned *size)
168{
169	if (value)
170		admhc_dbg_sw(ahcd, next, size, "%s %08x\n", label, value);
171}
172
173static char *buss2string(int state)
174{
175	switch (state) {
176	case ADMHC_BUSS_RESET:
177		return "reset";
178	case ADMHC_BUSS_RESUME:
179		return "resume";
180	case ADMHC_BUSS_OPER:
181		return "operational";
182	case ADMHC_BUSS_SUSPEND:
183		return "suspend";
184	}
185	return "?state";
186}
187
188static void
189admhc_dump_status(struct admhcd *ahcd, char **next, unsigned *size)
190{
191	struct admhcd_regs __iomem *regs = ahcd->regs;
192	u32			temp;
193
194	temp = admhc_readl(ahcd, &regs->gencontrol);
195	admhc_dbg_sw(ahcd, next, size,
196		"gencontrol 0x%08x%s%s%s%s\n",
197		temp,
198		(temp & ADMHC_CTRL_UHFE) ? " UHFE" : "",
199		(temp & ADMHC_CTRL_SIR) ? " SIR" : "",
200		(temp & ADMHC_CTRL_DMAA) ? " DMAA" : "",
201		(temp & ADMHC_CTRL_SR) ? " SR" : ""
202		);
203
204	temp = admhc_readl(ahcd, &regs->host_control);
205	admhc_dbg_sw(ahcd, next, size,
206		"host_control 0x%08x BUSS=%s%s\n",
207		temp,
208		buss2string(temp & ADMHC_HC_BUSS),
209		(temp & ADMHC_HC_DMAE) ? " DMAE" : ""
210		);
211
212	admhc_dump_intr_mask(ahcd, "int_status",
213			admhc_readl(ahcd, &regs->int_status),
214			next, size);
215	admhc_dump_intr_mask(ahcd, "int_enable",
216			admhc_readl(ahcd, &regs->int_enable),
217			next, size);
218
219	maybe_print_eds(ahcd, "hosthead",
220			admhc_readl(ahcd, &regs->hosthead), next, size);
221}
222
223#define dbg_port_sw(hc, num, value, next, size) \
224	admhc_dbg_sw(hc, next, size, \
225		"portstatus [%d] " \
226		"0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
227		num, temp, \
228		(temp & ADMHC_PS_PRSC) ? " PRSC" : "", \
229		(temp & ADMHC_PS_OCIC) ? " OCIC" : "", \
230		(temp & ADMHC_PS_PSSC) ? " PSSC" : "", \
231		(temp & ADMHC_PS_PESC) ? " PESC" : "", \
232		(temp & ADMHC_PS_CSC) ? " CSC" : "", \
233		\
234		(temp & ADMHC_PS_LSDA) ? " LSDA" : "", \
235		(temp & ADMHC_PS_PPS) ? " PPS" : "", \
236		(temp & ADMHC_PS_PRS) ? " PRS" : "", \
237		(temp & ADMHC_PS_POCI) ? " POCI" : "", \
238		(temp & ADMHC_PS_PSS) ? " PSS" : "", \
239		\
240		(temp & ADMHC_PS_PES) ? " PES" : "", \
241		(temp & ADMHC_PS_CCS) ? " CCS" : "" \
242		);
243
244
245static void
246admhc_dump_roothub(
247	struct admhcd *ahcd,
248	int verbose,
249	char **next,
250	unsigned *size)
251{
252	u32			temp, i;
253
254	temp = admhc_read_rhdesc(ahcd);
255	if (temp == ~(u32)0)
256		return;
257
258	if (verbose) {
259		admhc_dbg_sw(ahcd, next, size,
260			"rhdesc %08x%s%s%s%s%s%s PPCM=%02x%s%s%s%s NUMP=%d(%d)\n",
261			temp,
262			(temp & ADMHC_RH_CRWE) ? " CRWE" : "",
263			(temp & ADMHC_RH_OCIC) ? " OCIC" : "",
264			(temp & ADMHC_RH_LPSC) ? " LPSC" : "",
265			(temp & ADMHC_RH_LPSC) ? " DRWE" : "",
266			(temp & ADMHC_RH_LPSC) ? " OCI" : "",
267			(temp & ADMHC_RH_LPSC) ? " LPS" : "",
268			((temp & ADMHC_RH_PPCM) >> 16),
269			(temp & ADMHC_RH_NOCP) ? " NOCP" : "",
270			(temp & ADMHC_RH_OCPM) ? " OCPM" : "",
271			(temp & ADMHC_RH_NPS) ? " NPS" : "",
272			(temp & ADMHC_RH_PSM) ? " PSM" : "",
273			(temp & ADMHC_RH_NUMP), ahcd->num_ports
274			);
275	}
276
277	for (i = 0; i < ahcd->num_ports; i++) {
278		temp = admhc_read_portstatus(ahcd, i);
279		dbg_port_sw(ahcd, i, temp, next, size);
280	}
281}
282
283static void admhc_dump(struct admhcd *ahcd, int verbose)
284{
285	admhc_dbg(ahcd, "ADMHC ahcd state\n");
286
287	/* dumps some of the state we know about */
288	admhc_dump_status(ahcd, NULL, NULL);
289	admhc_dbg(ahcd, "current frame #%04x\n",
290		admhc_frame_no(ahcd));
291
292	admhc_dump_roothub(ahcd, verbose, NULL, NULL);
293}
294
295static const char data0[] = "DATA0";
296static const char data1[] = "DATA1";
297
298static void admhc_dump_td(const struct admhcd *ahcd, const char *label,
299		const struct td *td)
300{
301	u32	tmp;
302
303	admhc_dbg(ahcd, "%s td %p; urb %p index %d; hwNextTD %08x\n",
304		label, td,
305		td->urb, td->index,
306		hc32_to_cpup(ahcd, &td->hwNextTD));
307
308	tmp = hc32_to_cpup(ahcd, &td->hwINFO);
309	admhc_dbg(ahcd, "     status %08x%s CC=%x EC=%d %s %s ISI=%x FN=%x\n",
310		tmp,
311		(tmp & TD_OWN) ? " OWN" : "",
312		TD_CC_GET(tmp),
313		TD_EC_GET(tmp),
314		td_togglestring(tmp),
315		td_pidstring(tmp),
316		TD_ISI_GET(tmp),
317		TD_FN_GET(tmp));
318
319	tmp = hc32_to_cpup(ahcd, &td->hwCBL);
320	admhc_dbg(ahcd, "     dbp %08x; cbl %08x; LEN=%d%s\n",
321		hc32_to_cpup(ahcd, &td->hwDBP),
322		tmp,
323		TD_BL_GET(tmp),
324		(tmp & TD_IE) ? " IE" : "");
325}
326
327/* caller MUST own hcd spinlock if verbose is set! */
328static void __attribute__((unused))
329admhc_dump_ed(const struct admhcd *ahcd, const char *label,
330		const struct ed *ed, int verbose)
331{
332	u32 tmp = hc32_to_cpu(ahcd, ed->hwINFO);
333
334	admhc_dbg(ahcd, "%s ed %p %s type %s; next ed %08x\n",
335		label,
336		ed, ed_statestring(ed->state), ed_typestring(ed->type),
337		hc32_to_cpup(ahcd, &ed->hwNextED));
338
339	admhc_dbg(ahcd, "  info %08x MAX=%d%s%s%s%s EP=%d DEV=%d\n", tmp,
340		ED_MPS_GET(tmp),
341		(tmp & ED_ISO) ? " ISO" : "",
342		(tmp & ED_SKIP) ? " SKIP" : "",
343		(tmp & ED_SPEED_FULL) ? " FULL" : " LOW",
344		(tmp & ED_INT) ? " INT" : "",
345		ED_EN_GET(tmp),
346		ED_FA_GET(tmp));
347
348	tmp = hc32_to_cpup(ahcd, &ed->hwHeadP);
349	admhc_dbg(ahcd, "  tds: head %08x tail %08x %s%s%s\n",
350		tmp & TD_MASK,
351		hc32_to_cpup(ahcd, &ed->hwTailP),
352		(tmp & ED_C) ? data1 : data0,
353		(tmp & ED_H) ? " HALT" : "",
354		verbose ? " td list follows" : " (not listing)");
355
356	if (verbose) {
357		struct list_head	*tmp;
358
359		/* use ed->td_list because HC concurrently modifies
360		 * hwNextTD as it accumulates ed_donelist.
361		 */
362		list_for_each(tmp, &ed->td_list) {
363			struct td		*td;
364			td = list_entry(tmp, struct td, td_list);
365			admhc_dump_td(ahcd, "  ->", td);
366		}
367	}
368}
369
370#else /* ifdef DEBUG */
371
372static inline void urb_print(struct admhcd *ahcd, struct urb * urb, char * str,
373	int small, int status) {}
374static inline void admhc_dump_ed(const struct admhcd *ahcd, const char *label,
375	const struct ed *ed, int verbose) {}
376static inline void admhc_dump_td(const struct admhcd *ahcd, const char *label,
377	const struct td *td) {}
378static inline void admhc_dump(struct admhcd *ahcd, int verbose) {}
379
380#undef ADMHC_VERBOSE_DEBUG
381
382#endif /* DEBUG */
383
384/*-------------------------------------------------------------------------*/
385
386#ifdef STUB_DEBUG_FILES
387
388static inline void create_debug_files(struct admhcd *bus) { }
389static inline void remove_debug_files(struct admhcd *bus) { }
390
391#else
392
393static int debug_async_open(struct inode *, struct file *);
394static int debug_periodic_open(struct inode *, struct file *);
395static int debug_registers_open(struct inode *, struct file *);
396static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
397static int debug_close(struct inode *, struct file *);
398
399static const struct file_operations debug_async_fops = {
400	.owner		= THIS_MODULE,
401	.open		= debug_async_open,
402	.read		= debug_output,
403	.release	= debug_close,
404	.llseek		= default_llseek,
405};
406static const struct file_operations debug_periodic_fops = {
407	.owner		= THIS_MODULE,
408	.open		= debug_periodic_open,
409	.read		= debug_output,
410	.release	= debug_close,
411	.llseek		= default_llseek,
412};
413static const struct file_operations debug_registers_fops = {
414	.owner		= THIS_MODULE,
415	.open		= debug_registers_open,
416	.read		= debug_output,
417	.release	= debug_close,
418	.llseek		= default_llseek,
419};
420
421static struct dentry *admhc_debug_root;
422
423struct debug_buffer {
424	ssize_t (*fill_func)(struct debug_buffer *);    /* fill method */
425	struct admhcd *ahcd;
426	struct mutex mutex;     /* protect filling of buffer */
427	size_t count;           /* number of characters filled into buffer */
428	char *page;
429};
430
431static ssize_t
432show_list(struct admhcd *ahcd, char *buf, size_t count, struct ed *ed)
433{
434	unsigned temp;
435	unsigned size = count;
436
437	if (!ed)
438		return 0;
439
440	/* dump a snapshot of the bulk or control schedule */
441	while (ed) {
442		u32 info = hc32_to_cpu(ahcd, ed->hwINFO);
443		u32 headp = hc32_to_cpu(ahcd, ed->hwHeadP);
444		u32 tailp = hc32_to_cpu(ahcd, ed->hwTailP);
445		struct list_head *entry;
446		struct td	*td;
447
448		temp = scnprintf(buf, size,
449			"ed/%p %s %s %cs dev%d ep%d %s%smax %d %08x%s%s %s"
450			" h:%08x t:%08x",
451			ed,
452			ed_statestring(ed->state),
453			ed_typestring(ed->type),
454			(info & ED_SPEED_FULL) ? 'f' : 'l',
455			info & ED_FA_MASK,
456			(info >> ED_EN_SHIFT) & ED_EN_MASK,
457			(info & ED_INT) ? "INT " : "",
458			(info & ED_ISO) ? "ISO " : "",
459			(info >> ED_MPS_SHIFT) & ED_MPS_MASK ,
460			info,
461			(info & ED_SKIP) ? " S" : "",
462			(headp & ED_H) ? " H" : "",
463			(headp & ED_C) ? data1 : data0,
464			headp & ED_MASK, tailp);
465		size -= temp;
466		buf += temp;
467
468		list_for_each(entry, &ed->td_list) {
469			u32		dbp, cbl;
470
471			td = list_entry(entry, struct td, td_list);
472			info = hc32_to_cpup(ahcd, &td->hwINFO);
473			dbp = hc32_to_cpup(ahcd, &td->hwDBP);
474			cbl = hc32_to_cpup(ahcd, &td->hwCBL);
475
476			temp = scnprintf(buf, size,
477				"\n\ttd/%p %s %d %s%scc=%x urb %p (%08x,%08x)",
478				td,
479				td_pidstring(info),
480				TD_BL_GET(cbl),
481				(info & TD_OWN) ? "" : "DONE ",
482				(cbl & TD_IE) ? "IE " : "",
483				TD_CC_GET(info), td->urb, info, cbl);
484			size -= temp;
485			buf += temp;
486		}
487
488		temp = scnprintf(buf, size, "\n");
489		size -= temp;
490		buf += temp;
491
492		ed = ed->ed_next;
493	}
494
495	return count - size;
496}
497
498static ssize_t fill_async_buffer(struct debug_buffer *buf)
499{
500	struct admhcd		*ahcd;
501	size_t			temp;
502	unsigned long		flags;
503
504	ahcd = buf->ahcd;
505
506	spin_lock_irqsave(&ahcd->lock, flags);
507	temp = show_list(ahcd, buf->page, PAGE_SIZE, ahcd->ed_head);
508	spin_unlock_irqrestore(&ahcd->lock, flags);
509
510	return temp;
511}
512
513
514#define DBG_SCHED_LIMIT 64
515
516static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
517{
518	struct admhcd		*ahcd;
519	struct ed		**seen, *ed;
520	unsigned long		flags;
521	unsigned		temp, size, seen_count;
522	char			*next;
523	unsigned		i;
524
525	seen = kmalloc(DBG_SCHED_LIMIT * sizeof(*seen), GFP_ATOMIC);
526	if (!seen)
527		return 0;
528	seen_count = 0;
529
530	ahcd = buf->ahcd;
531	next = buf->page;
532	size = PAGE_SIZE;
533
534	temp = scnprintf(next, size, "size = %d\n", NUM_INTS);
535	size -= temp;
536	next += temp;
537
538	/* dump a snapshot of the periodic schedule (and load) */
539	spin_lock_irqsave(&ahcd->lock, flags);
540	for (i = 0; i < NUM_INTS; i++) {
541		ed = ahcd->periodic[i];
542		if (!ed)
543			continue;
544
545		temp = scnprintf(next, size, "%2d [%3d]:", i, ahcd->load[i]);
546		size -= temp;
547		next += temp;
548
549		do {
550			temp = scnprintf(next, size, " ed%d/%p",
551				ed->interval, ed);
552			size -= temp;
553			next += temp;
554			for (temp = 0; temp < seen_count; temp++) {
555				if (seen[temp] == ed)
556					break;
557			}
558
559			/* show more info the first time around */
560			if (temp == seen_count) {
561				u32	info = hc32_to_cpu(ahcd, ed->hwINFO);
562				struct list_head	*entry;
563				unsigned		qlen = 0;
564
565				/* qlen measured here in TDs, not urbs */
566				list_for_each(entry, &ed->td_list)
567					qlen++;
568				temp = scnprintf(next, size,
569					" (%cs dev%d ep%d%s qlen %u"
570					" max %d %08x%s%s)",
571					(info & ED_SPEED_FULL) ? 'f' : 'l',
572					ED_FA_GET(info),
573					ED_EN_GET(info),
574					(info & ED_ISO) ? "iso" : "int",
575					qlen,
576					ED_MPS_GET(info),
577					info,
578					(info & ED_SKIP) ? " K" : "",
579					(ed->hwHeadP &
580						cpu_to_hc32(ahcd, ED_H)) ?
581							" H" : "");
582				size -= temp;
583				next += temp;
584
585				if (seen_count < DBG_SCHED_LIMIT)
586					seen[seen_count++] = ed;
587
588				ed = ed->ed_next;
589
590			} else {
591				/* we've seen it and what's after */
592				temp = 0;
593				ed = NULL;
594			}
595
596		} while (ed);
597
598		temp = scnprintf(next, size, "\n");
599		size -= temp;
600		next += temp;
601	}
602	spin_unlock_irqrestore(&ahcd->lock, flags);
603	kfree(seen);
604
605	return PAGE_SIZE - size;
606}
607
608
609#undef DBG_SCHED_LIMIT
610
611static ssize_t fill_registers_buffer(struct debug_buffer *buf)
612{
613	struct usb_hcd		*hcd;
614	struct admhcd		*ahcd;
615	struct admhcd_regs __iomem *regs;
616	unsigned long		flags;
617	unsigned		temp, size;
618	char			*next;
619	u32			rdata;
620
621	ahcd = buf->ahcd;
622	hcd = admhc_to_hcd(ahcd);
623	regs = ahcd->regs;
624	next = buf->page;
625	size = PAGE_SIZE;
626
627	spin_lock_irqsave(&ahcd->lock, flags);
628
629	/* dump driver info, then registers in spec order */
630
631	admhc_dbg_sw(ahcd, &next, &size,
632		"bus %s, device %s\n"
633		"%s\n"
634		"%s\n",
635		hcd->self.controller->bus->name,
636		dev_name(hcd->self.controller),
637		hcd->product_desc,
638		hcd_name);
639
640	if (!HCD_HW_ACCESSIBLE(hcd)) {
641		size -= scnprintf(next, size,
642			"SUSPENDED (no register access)\n");
643		goto done;
644	}
645
646	admhc_dump_status(ahcd, &next, &size);
647
648	/* other registers mostly affect frame timings */
649	rdata = admhc_readl(ahcd, &regs->fminterval);
650	temp = scnprintf(next, size,
651			"fmintvl 0x%08x %sFSLDP=0x%04x FI=0x%04x\n",
652			rdata, (rdata & ADMHC_SFI_FIT) ? "FIT " : "",
653			(rdata >> ADMHC_SFI_FSLDP_SHIFT) & ADMHC_SFI_FSLDP_MASK,
654			rdata  & ADMHC_SFI_FI_MASK);
655	size -= temp;
656	next += temp;
657
658	rdata = admhc_readl(ahcd, &regs->fmnumber);
659	temp = scnprintf(next, size, "fmnumber 0x%08x %sFR=0x%04x FN=%04x\n",
660			rdata, (rdata & ADMHC_SFN_FRT) ? "FRT " : "",
661			(rdata >> ADMHC_SFN_FR_SHIFT) & ADMHC_SFN_FR_MASK,
662			rdata  & ADMHC_SFN_FN_MASK);
663	size -= temp;
664	next += temp;
665
666	/* TODO: use predefined bitmask */
667	rdata = admhc_readl(ahcd, &regs->lsthresh);
668	temp = scnprintf(next, size, "lsthresh 0x%04x\n",
669			rdata & 0x3fff);
670	size -= temp;
671	next += temp;
672
673	temp = scnprintf(next, size, "hub poll timer: %s\n",
674			admhcd_to_hcd(ahcd)->poll_rh ? "ON" : "OFF");
675	size -= temp;
676	next += temp;
677
678	/* roothub */
679	admhc_dump_roothub(ahcd, 1, &next, &size);
680
681done:
682	spin_unlock_irqrestore(&ahcd->lock, flags);
683	return PAGE_SIZE - size;
684}
685
686
687static struct debug_buffer *alloc_buffer(struct admhcd *ahcd,
688				ssize_t (*fill_func)(struct debug_buffer *))
689{
690	struct debug_buffer *buf;
691
692	buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
693
694	if (buf) {
695		buf->ahcd = ahcd;
696		buf->fill_func = fill_func;
697		mutex_init(&buf->mutex);
698	}
699
700	return buf;
701}
702
703static int fill_buffer(struct debug_buffer *buf)
704{
705	int ret = 0;
706
707	if (!buf->page)
708		buf->page = (char *)get_zeroed_page(GFP_KERNEL);
709
710	if (!buf->page) {
711		ret = -ENOMEM;
712		goto out;
713	}
714
715	ret = buf->fill_func(buf);
716
717	if (ret >= 0) {
718		buf->count = ret;
719		ret = 0;
720	}
721
722out:
723	return ret;
724}
725
726static ssize_t debug_output(struct file *file, char __user *user_buf,
727			size_t len, loff_t *offset)
728{
729	struct debug_buffer *buf = file->private_data;
730	int ret = 0;
731
732	mutex_lock(&buf->mutex);
733	if (buf->count == 0) {
734		ret = fill_buffer(buf);
735		if (ret != 0) {
736			mutex_unlock(&buf->mutex);
737			goto out;
738		}
739	}
740	mutex_unlock(&buf->mutex);
741
742	ret = simple_read_from_buffer(user_buf, len, offset,
743					buf->page, buf->count);
744
745out:
746	return ret;
747}
748
749static int debug_close(struct inode *inode, struct file *file)
750{
751	struct debug_buffer *buf = file->private_data;
752
753	if (buf) {
754		if (buf->page)
755			free_page((unsigned long)buf->page);
756		kfree(buf);
757	}
758
759	return 0;
760}
761
762static int debug_async_open(struct inode *inode, struct file *file)
763{
764	file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
765
766	return file->private_data ? 0 : -ENOMEM;
767}
768
769static int debug_periodic_open(struct inode *inode, struct file *file)
770{
771	file->private_data = alloc_buffer(inode->i_private,
772						fill_periodic_buffer);
773
774	return file->private_data ? 0 : -ENOMEM;
775}
776
777static int debug_registers_open(struct inode *inode, struct file *file)
778{
779	file->private_data = alloc_buffer(inode->i_private,
780						fill_registers_buffer);
781
782	return file->private_data ? 0 : -ENOMEM;
783}
784
785static inline void create_debug_files(struct admhcd *ahcd)
786{
787	struct usb_bus *bus = &admhcd_to_hcd(ahcd)->self;
788
789	ahcd->debug_dir = debugfs_create_dir(bus->bus_name, admhc_debug_root);
790	if (!ahcd->debug_dir)
791		goto dir_error;
792
793	ahcd->debug_async = debugfs_create_file("async", S_IRUGO,
794						ahcd->debug_dir, ahcd,
795						&debug_async_fops);
796	if (!ahcd->debug_async)
797		goto async_error;
798
799	ahcd->debug_periodic = debugfs_create_file("periodic", S_IRUGO,
800						ahcd->debug_dir, ahcd,
801						&debug_periodic_fops);
802	if (!ahcd->debug_periodic)
803		goto periodic_error;
804
805	ahcd->debug_registers = debugfs_create_file("registers", S_IRUGO,
806						ahcd->debug_dir, ahcd,
807						&debug_registers_fops);
808	if (!ahcd->debug_registers)
809		goto registers_error;
810
811	admhc_dbg(ahcd, "created debug files\n");
812	return;
813
814registers_error:
815	debugfs_remove(ahcd->debug_periodic);
816periodic_error:
817	debugfs_remove(ahcd->debug_async);
818async_error:
819	debugfs_remove(ahcd->debug_dir);
820dir_error:
821	ahcd->debug_periodic = NULL;
822	ahcd->debug_async = NULL;
823	ahcd->debug_dir = NULL;
824}
825
826static inline void remove_debug_files(struct admhcd *ahcd)
827{
828	debugfs_remove(ahcd->debug_registers);
829	debugfs_remove(ahcd->debug_periodic);
830	debugfs_remove(ahcd->debug_async);
831	debugfs_remove(ahcd->debug_dir);
832}
833
834#endif
835
836/*-------------------------------------------------------------------------*/
837