X-Git-Url: http://git.rohieb.name/openwrt.git/blobdiff_plain/15331876847019b1a3cdec43dcc19073b6b41dd2..3329b43e7655951c4b496eb7c24b2af096fcbef7:/target/linux/adm5120/files/drivers/usb/host/adm5120-dbg.c?ds=sidebyside

diff --git a/target/linux/adm5120/files/drivers/usb/host/adm5120-dbg.c b/target/linux/adm5120/files/drivers/usb/host/adm5120-dbg.c
index 817d97548..34ee9414d 100644
--- a/target/linux/adm5120/files/drivers/usb/host/adm5120-dbg.c
+++ b/target/linux/adm5120/files/drivers/usb/host/adm5120-dbg.c
@@ -1,72 +1,131 @@
 /*
- * OHCI HCD (Host Controller Driver) for USB.
+ * ADM5120 HCD (Host Controller Driver) for USB
  *
- * (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
- * (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
+ * Copyright (C) 2007-2008 Gabor Juhos <juhosg@openwrt.org>
+ *
+ * This file was derived from: drivers/usb/host/ohci-dbg.c
+ *   (C) Copyright 1999 Roman Weissgaerber <weissg@vienna.at>
+ *   (C) Copyright 2000-2002 David Brownell <dbrownell@users.sourceforge.net>
+ *
+ *  This program is free software; you can redistribute it and/or modify it
+ *  under the terms of the GNU General Public License version 2 as published
+ *  by the Free Software Foundation.
  *
- * This file is licenced under the GPL.
  */
 
 /*-------------------------------------------------------------------------*/
 
-#ifdef DEBUG
+static inline char *ed_typestring(int ed_type)
+{
+	switch (ed_type) {
+	case PIPE_CONTROL:
+		return "ctrl";
+	case PIPE_BULK:
+		return "bulk";
+	case PIPE_INTERRUPT:
+		return "intr";
+	case PIPE_ISOCHRONOUS:
+		return "isoc";
+	}
+	return "(bad ed_type)";
+}
+
+static inline char *ed_statestring(int state)
+{
+	switch (state) {
+	case ED_IDLE:
+		return "IDLE";
+	case ED_UNLINK:
+		return "UNLINK";
+	case ED_OPER:
+		return "OPER";
+	}
+	return "?STATE";
+}
+
+static inline char *pipestring(int pipe)
+{
+	return ed_typestring(usb_pipetype(pipe));
+}
+
+static inline char *td_pidstring(u32 info)
+{
+	switch (info & TD_DP) {
+	case TD_DP_SETUP:
+		return "SETUP";
+	case TD_DP_IN:
+		return "IN";
+	case TD_DP_OUT:
+		return "OUT";
+	}
+	return "?PID";
+}
+
+static inline char *td_togglestring(u32 info)
+{
+	switch (info & TD_T) {
+	case TD_T_DATA0:
+		return "DATA0";
+	case TD_T_DATA1:
+		return "DATA1";
+	case TD_T_CARRY:
+		return "CARRY";
+	}
+	return "?TOGGLE";
+}
+
+/*-------------------------------------------------------------------------*/
 
-#define edstring(ed_type) ({ char *temp; \
-	switch (ed_type) { \
-	case PIPE_CONTROL:	temp = "ctrl"; break; \
-	case PIPE_BULK:		temp = "bulk"; break; \
-	case PIPE_INTERRUPT:	temp = "intr"; break; \
-	default:		temp = "isoc"; break; \
-	}; temp;})
-#define pipestring(pipe) edstring(usb_pipetype(pipe))
+#ifdef DEBUG
 
 /* debug| print the main components of an URB
  * small: 0) header + data packets 1) just header
  */
 static void __attribute__((unused))
-urb_print(struct urb * urb, char * str, int small)
+urb_print(struct admhcd *ahcd, struct urb *urb, char *str, int small, int status)
 {
-	unsigned int pipe= urb->pipe;
+	unsigned int pipe = urb->pipe;
 
 	if (!urb->dev || !urb->dev->bus) {
-		dbg("%s URB: no dev", str);
+		admhc_dbg(ahcd, "%s URB: no dev", str);
 		return;
 	}
 
 #ifndef	ADMHC_VERBOSE_DEBUG
-	if (urb->status != 0)
+	if (status != 0)
 #endif
-	dbg("%s %p dev=%d ep=%d%s-%s flags=%x len=%d/%d stat=%d",
-		    str,
-		    urb,
-		    usb_pipedevice (pipe),
-		    usb_pipeendpoint (pipe),
-		    usb_pipeout(pipe)? "out" : "in",
-		    pipestring(pipe),
-		    urb->transfer_flags,
-		    urb->actual_length,
-		    urb->transfer_buffer_length,
-		    urb->status);
+	admhc_dbg(ahcd, "URB-%s %p dev=%d ep=%d%s-%s flags=%x len=%d/%d "
+			"stat=%d\n",
+			str,
+			urb,
+			usb_pipedevice(pipe),
+			usb_pipeendpoint(pipe),
+			usb_pipeout(pipe) ? "out" : "in",
+			pipestring(pipe),
+			urb->transfer_flags,
+			urb->actual_length,
+			urb->transfer_buffer_length,
+			status);
 
 #ifdef	ADMHC_VERBOSE_DEBUG
 	if (!small) {
 		int i, len;
 
 		if (usb_pipecontrol(pipe)) {
-			printk(KERN_DEBUG __FILE__ ": setup(8):");
+			admhc_dbg(ahcd, "setup(8):");
 			for (i = 0; i < 8 ; i++)
-				printk (" %02x", ((__u8 *) urb->setup_packet) [i]);
-			printk ("\n");
+				printk(KERN_INFO" %02x", ((__u8 *)urb->setup_packet)[i]);
+			printk(KERN_INFO "\n");
 		}
 		if (urb->transfer_buffer_length > 0 && urb->transfer_buffer) {
-			printk(KERN_DEBUG __FILE__ ": data(%d/%d):",
+			admhc_dbg(ahcd, "data(%d/%d):",
 				urb->actual_length,
 				urb->transfer_buffer_length);
-			len = usb_pipeout(pipe)?
-						urb->transfer_buffer_length: urb->actual_length;
+			len = usb_pipeout(pipe) ?
+						urb->transfer_buffer_length : urb->actual_length;
 			for (i = 0; i < 16 && i < len; i++)
-				printk (" %02x", ((__u8 *) urb->transfer_buffer) [i]);
-			printk ("%s stat:%d\n", i < len? "...": "", urb->status);
+				printk(KERN_INFO " %02x", ((__u8 *)urb->transfer_buffer)[i]);
+			printk(KERN_INFO "%s stat:%d\n", i < len ? "..." : "", status);
 		}
 	}
 #endif /* ADMHC_VERBOSE_DEBUG */
@@ -74,23 +133,19 @@ urb_print(struct urb * urb, char * str, int small)
 
 #define admhc_dbg_sw(ahcd, next, size, format, arg...) \
 	do { \
-	if (next) { \
-		unsigned s_len; \
-		s_len = scnprintf(*next, *size, format, ## arg ); \
-		*size -= s_len; *next += s_len; \
-	} else \
-		admhc_dbg(ahcd,format, ## arg ); \
+		if (next) { \
+			unsigned s_len; \
+			s_len = scnprintf(*next, *size, format, ## arg); \
+			*size -= s_len; *next += s_len; \
+		} else \
+			admhc_dbg(ahcd, format, ## arg); \
 	} while (0);
 
 
-static void admhc_dump_intr_mask (
-	struct admhcd *ahcd,
-	char *label,
-	u32 mask,
-	char **next,
-	unsigned *size)
+static void admhc_dump_intr_mask(struct admhcd *ahcd, char *label, u32 mask,
+		char **next, unsigned *size)
 {
-	admhc_dbg_sw(ahcd, next, size, "%s 0x%08x%s%s%s%s%s%s%s%s%s%s\n",
+	admhc_dbg_sw(ahcd, next, size, "%s 0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n",
 		label,
 		mask,
 		(mask & ADMHC_INTR_INTA) ? " INTA" : "",
@@ -101,23 +156,21 @@ static void admhc_dump_intr_mask (
 		(mask & ADMHC_INTR_SO) ? " SO" : "",
 		(mask & ADMHC_INTR_INSM) ? " INSM" : "",
 		(mask & ADMHC_INTR_BABI) ? " BABI" : "",
+		(mask & ADMHC_INTR_7) ? " !7!" : "",
+		(mask & ADMHC_INTR_6) ? " !6!" : "",
 		(mask & ADMHC_INTR_RESI) ? " RESI" : "",
 		(mask & ADMHC_INTR_SOFI) ? " SOFI" : ""
 		);
 }
 
-static void maybe_print_eds (
-	struct admhcd *ahcd,
-	char *label,
-	u32 value,
-	char **next,
-	unsigned *size)
+static void maybe_print_eds(struct admhcd *ahcd, char *label, u32 value,
+		char **next, unsigned *size)
 {
 	if (value)
 		admhc_dbg_sw(ahcd, next, size, "%s %08x\n", label, value);
 }
 
-static char *buss2string (int state)
+static char *buss2string(int state)
 {
 	switch (state) {
 	case ADMHC_BUSS_RESET:
@@ -129,7 +182,7 @@ static char *buss2string (int state)
 	case ADMHC_BUSS_SUSPEND:
 		return "suspend";
 	}
-	return "(bad state)";
+	return "?state";
 }
 
 static void
@@ -152,7 +205,7 @@ admhc_dump_status(struct admhcd *ahcd, char **next, unsigned *size)
 	admhc_dbg_sw(ahcd, next, size,
 		"host_control 0x%08x BUSS=%s%s\n",
 		temp,
-		buss2string (temp & ADMHC_HC_BUSS),
+		buss2string(temp & ADMHC_HC_BUSS),
 		(temp & ADMHC_HC_DMAE) ? " DMAE" : ""
 		);
 
@@ -167,7 +220,7 @@ admhc_dump_status(struct admhcd *ahcd, char **next, unsigned *size)
 			admhc_readl(ahcd, &regs->hosthead), next, size);
 }
 
-#define dbg_port_sw(hc,num,value,next,size) \
+#define dbg_port_sw(hc, num, value, next, size) \
 	admhc_dbg_sw(hc, next, size, \
 		"portstatus [%d] " \
 		"0x%08x%s%s%s%s%s%s%s%s%s%s%s%s\n", \
@@ -198,7 +251,7 @@ admhc_dump_roothub(
 {
 	u32			temp, i;
 
-	temp = admhc_get_rhdesc(ahcd);
+	temp = admhc_read_rhdesc(ahcd);
 	if (temp == ~(u32)0)
 		return;
 
@@ -222,7 +275,7 @@ admhc_dump_roothub(
 	}
 
 	for (i = 0; i < ahcd->num_ports; i++) {
-		temp = admhc_get_portstatus(ahcd, i);
+		temp = admhc_read_portstatus(ahcd, i);
 		dbg_port_sw(ahcd, i, temp, next, size);
 	}
 }
@@ -233,7 +286,7 @@ static void admhc_dump(struct admhcd *ahcd, int verbose)
 
 	/* dumps some of the state we know about */
 	admhc_dump_status(ahcd, NULL, NULL);
-	admhc_dbg(ahcd,"current frame #%04x\n",
+	admhc_dbg(ahcd, "current frame #%04x\n",
 		admhc_frame_no(ahcd));
 
 	admhc_dump_roothub(ahcd, verbose, NULL, NULL);
@@ -245,59 +298,30 @@ static const char data1[] = "DATA1";
 static void admhc_dump_td(const struct admhcd *ahcd, const char *label,
 		const struct td *td)
 {
-	u32	tmp = hc32_to_cpup(ahcd, &td->hwINFO);
+	u32	tmp;
 
 	admhc_dbg(ahcd, "%s td %p; urb %p index %d; hwNextTD %08x\n",
 		label, td,
 		td->urb, td->index,
 		hc32_to_cpup(ahcd, &td->hwNextTD));
 
-	if ((td->flags & TD_FLAG_ISO) == 0) {
-		const char	*toggle, *pid;
-
-		switch (tmp & TD_T) {
-		case TD_T_DATA0: toggle = data0; break;
-		case TD_T_DATA1: toggle = data1; break;
-		case TD_T_CARRY: toggle = "CARRY"; break;
-		default: toggle = "(bad toggle)"; break;
-		}
-		switch (tmp & TD_DP) {
-		case TD_DP_SETUP: pid = "SETUP"; break;
-		case TD_DP_IN: pid = "IN"; break;
-		case TD_DP_OUT: pid = "OUT"; break;
-		default: pid = "(bad pid)"; break;
-		}
-		admhc_dbg(ahcd,
-			"     status %08x%s CC=%x EC=%d %s %s ISI=%x FN=%x\n",
-			tmp,
-			(tmp & TD_OWN) ? " OWN" : "",
-			TD_CC_GET(tmp),
-			TD_EC_GET(tmp),
-			toggle,
-			pid,
-			TD_ISI_GET(tmp),
-			TD_FN_GET(tmp));
-	} else {
-#if 0		/* TODO: remove */
-		unsigned	i;
-		admhc_dbg(ahcd, "  info %08x CC=%x FC=%d DI=%d SF=%04x\n", tmp,
-			TD_CC_GET(tmp),
-			(tmp >> 24) & 0x07,
-			(tmp & TD_DI) >> 21,
-			tmp & 0x0000ffff);
-		admhc_dbg(ahcd, "  bp0 %08x be %08x\n",
-			hc32_to_cpup (ahcd, &td->hwCBP) & ~0x0fff,
-			hc32_to_cpup (ahcd, &td->hwBE));
-#endif
-	}
+	tmp = hc32_to_cpup(ahcd, &td->hwINFO);
+	admhc_dbg(ahcd, "     status %08x%s CC=%x EC=%d %s %s ISI=%x FN=%x\n",
+		tmp,
+		(tmp & TD_OWN) ? " OWN" : "",
+		TD_CC_GET(tmp),
+		TD_EC_GET(tmp),
+		td_togglestring(tmp),
+		td_pidstring(tmp),
+		TD_ISI_GET(tmp),
+		TD_FN_GET(tmp));
 
 	tmp = hc32_to_cpup(ahcd, &td->hwCBL);
 	admhc_dbg(ahcd, "     dbp %08x; cbl %08x; LEN=%d%s\n",
-		hc32_to_cpup (ahcd, &td->hwDBP),
+		hc32_to_cpup(ahcd, &td->hwDBP),
 		tmp,
 		TD_BL_GET(tmp),
-		(tmp & TD_IE) ? " IE" : ""
-	);
+		(tmp & TD_IE) ? " IE" : "");
 }
 
 /* caller MUST own hcd spinlock if verbose is set! */
@@ -307,10 +331,10 @@ admhc_dump_ed(const struct admhcd *ahcd, const char *label,
 {
 	u32 tmp = hc32_to_cpu(ahcd, ed->hwINFO);
 
-	admhc_dbg(ahcd, "%s ed %p state 0x%x type %s; next ed %08x\n",
+	admhc_dbg(ahcd, "%s ed %p %s type %s; next ed %08x\n",
 		label,
-		ed, ed->state, edstring (ed->type),
-		hc32_to_cpup (ahcd, &ed->hwNextED));
+		ed, ed_statestring(ed->state), ed_typestring(ed->type),
+		hc32_to_cpup(ahcd, &ed->hwNextED));
 
 	admhc_dbg(ahcd, "  info %08x MAX=%d%s%s%s%s EP=%d DEV=%d\n", tmp,
 		ED_MPS_GET(tmp),
@@ -324,7 +348,7 @@ admhc_dump_ed(const struct admhcd *ahcd, const char *label,
 	tmp = hc32_to_cpup(ahcd, &ed->hwHeadP);
 	admhc_dbg(ahcd, "  tds: head %08x tail %08x %s%s%s\n",
 		tmp & TD_MASK,
-		hc32_to_cpup (ahcd, &ed->hwTailP),
+		hc32_to_cpup(ahcd, &ed->hwTailP),
 		(tmp & ED_C) ? data1 : data0,
 		(tmp & ED_H) ? " HALT" : "",
 		verbose ? " td list follows" : " (not listing)");
@@ -338,16 +362,19 @@ admhc_dump_ed(const struct admhcd *ahcd, const char *label,
 		list_for_each(tmp, &ed->td_list) {
 			struct td		*td;
 			td = list_entry(tmp, struct td, td_list);
-			admhc_dump_td (ahcd, "  ->", td);
+			admhc_dump_td(ahcd, "  ->", td);
 		}
 	}
 }
 
 #else /* ifdef DEBUG */
 
-static inline void urb_print(struct urb * urb, char * str, int small) {}
+static inline void urb_print(struct admhcd *ahcd, struct urb * urb, char * str,
+	int small, int status) {}
 static inline void admhc_dump_ed(const struct admhcd *ahcd, const char *label,
 	const struct ed *ed, int verbose) {}
+static inline void admhc_dump_td(const struct admhcd *ahcd, const char *label,
+	const struct td *td) {}
 static inline void admhc_dump(struct admhcd *ahcd, int verbose) {}
 
 #undef ADMHC_VERBOSE_DEBUG
@@ -363,31 +390,64 @@ static inline void remove_debug_files(struct admhcd *bus) { }
 
 #else
 
+static int debug_async_open(struct inode *, struct file *);
+static int debug_periodic_open(struct inode *, struct file *);
+static int debug_registers_open(struct inode *, struct file *);
+static ssize_t debug_output(struct file*, char __user*, size_t, loff_t*);
+static int debug_close(struct inode *, struct file *);
+
+static const struct file_operations debug_async_fops = {
+	.owner		= THIS_MODULE,
+	.open		= debug_async_open,
+	.read		= debug_output,
+	.release	= debug_close,
+};
+static const struct file_operations debug_periodic_fops = {
+	.owner		= THIS_MODULE,
+	.open		= debug_periodic_open,
+	.read		= debug_output,
+	.release	= debug_close,
+};
+static const struct file_operations debug_registers_fops = {
+	.owner		= THIS_MODULE,
+	.open		= debug_registers_open,
+	.read		= debug_output,
+	.release	= debug_close,
+};
+
+static struct dentry *admhc_debug_root;
+
+struct debug_buffer {
+	ssize_t (*fill_func)(struct debug_buffer *);    /* fill method */
+	struct device *dev;
+	struct mutex mutex;     /* protect filling of buffer */
+	size_t count;           /* number of characters filled into buffer */
+	char *page;
+};
+
 static ssize_t
 show_list(struct admhcd *ahcd, char *buf, size_t count, struct ed *ed)
 {
-	unsigned		temp, size = count;
+	unsigned temp;
+	unsigned size = count;
 
 	if (!ed)
 		return 0;
 
-#if 0
-	/* print first --> last */
-	while (ed->ed_prev)
-		ed = ed->ed_prev;
-#endif
-
 	/* dump a snapshot of the bulk or control schedule */
 	while (ed) {
 		u32 info = hc32_to_cpu(ahcd, ed->hwINFO);
 		u32 headp = hc32_to_cpu(ahcd, ed->hwHeadP);
+		u32 tailp = hc32_to_cpu(ahcd, ed->hwTailP);
 		struct list_head *entry;
 		struct td	*td;
 
 		temp = scnprintf(buf, size,
-			"ed/%p %s %cs dev%d ep%d %s%smax %d %08x%s%s %s",
+			"ed/%p %s %s %cs dev%d ep%d %s%smax %d %08x%s%s %s"
+			" h:%08x t:%08x",
 			ed,
-			edstring (ed->type),
+			ed_statestring(ed->state),
+			ed_typestring(ed->type),
 			(info & ED_SPEED_FULL) ? 'f' : 'l',
 			info & ED_FA_MASK,
 			(info >> ED_EN_SHIFT) & ED_EN_MASK,
@@ -397,7 +457,8 @@ show_list(struct admhcd *ahcd, char *buf, size_t count, struct ed *ed)
 			info,
 			(info & ED_SKIP) ? " S" : "",
 			(headp & ED_H) ? " H" : "",
-			(headp & ED_C) ? data1 : data0);
+			(headp & ED_C) ? data1 : data0,
+			headp & ED_MASK, tailp);
 		size -= temp;
 		buf += temp;
 
@@ -405,24 +466,18 @@ show_list(struct admhcd *ahcd, char *buf, size_t count, struct ed *ed)
 			u32		dbp, cbl;
 
 			td = list_entry(entry, struct td, td_list);
-			info = hc32_to_cpup (ahcd, &td->hwINFO);
-			dbp = hc32_to_cpup (ahcd, &td->hwDBP);
-			cbl = hc32_to_cpup (ahcd, &td->hwCBL);
+			info = hc32_to_cpup(ahcd, &td->hwINFO);
+			dbp = hc32_to_cpup(ahcd, &td->hwDBP);
+			cbl = hc32_to_cpup(ahcd, &td->hwCBL);
 
 			temp = scnprintf(buf, size,
-				"\n\ttd %p %s %d %s%scc=%x urb %p (%08x,%08x)",
+				"\n\ttd/%p %s %d %s%scc=%x urb %p (%08x,%08x)",
 				td,
-				({ char *pid;
-				switch (info & TD_DP) {
-				case TD_DP_SETUP: pid = "setup"; break;
-				case TD_DP_IN: pid = "in"; break;
-				case TD_DP_OUT: pid = "out"; break;
-				default: pid = "(bad pid)"; break;
-				 } pid;}),
+				td_pidstring(info),
 				TD_BL_GET(cbl),
 				(info & TD_OWN) ? "" : "DONE ",
 				(cbl & TD_IE) ? "IE " : "",
-				TD_CC_GET (info), td->urb, info, cbl);
+				TD_CC_GET(info), td->urb, info, cbl);
 			size -= temp;
 			buf += temp;
 		}
@@ -433,11 +488,11 @@ show_list(struct admhcd *ahcd, char *buf, size_t count, struct ed *ed)
 
 		ed = ed->ed_next;
 	}
+
 	return count - size;
 }
 
-static ssize_t
-show_async(struct class_device *class_dev, char *buf)
+static ssize_t fill_async_buffer(struct debug_buffer *buf)
 {
 	struct usb_bus		*bus;
 	struct usb_hcd		*hcd;
@@ -445,34 +500,21 @@ show_async(struct class_device *class_dev, char *buf)
 	size_t			temp;
 	unsigned long		flags;
 
-	bus = class_get_devdata(class_dev);
+	bus = dev_get_drvdata(buf->dev);
 	hcd = bus_to_hcd(bus);
 	ahcd = hcd_to_admhcd(hcd);
 
-	/* display control and bulk lists together, for simplicity */
 	spin_lock_irqsave(&ahcd->lock, flags);
-#if 0
-	temp = show_list (ahcd, buf, PAGE_SIZE, ahcd->ed_tails[ED_TAIL_CONTROL]);
-	temp += show_list (ahcd, buf + temp, PAGE_SIZE - temp,
-		ahcd->ed_tails[ED_TAIL_BULK]);
-#else
-#ifdef ED_TAIL_ARRAY
-	temp = show_list(ahcd, buf, PAGE_SIZE, ahcd->ed_head);
-#else
-	temp = show_list(ahcd, buf, PAGE_SIZE, ahcd->ed_head);
-#endif
-#endif
+	temp = show_list(ahcd, buf->page, PAGE_SIZE, ahcd->ed_head);
 	spin_unlock_irqrestore(&ahcd->lock, flags);
 
 	return temp;
 }
-static CLASS_DEVICE_ATTR(async, S_IRUGO, show_async, NULL);
 
 
 #define DBG_SCHED_LIMIT 64
 
-static ssize_t
-show_periodic(struct class_device *class_dev, char *buf)
+static ssize_t fill_periodic_buffer(struct debug_buffer *buf)
 {
 	struct usb_bus		*bus;
 	struct usb_hcd		*hcd;
@@ -483,14 +525,15 @@ show_periodic(struct class_device *class_dev, char *buf)
 	char			*next;
 	unsigned		i;
 
-	if (!(seen = kmalloc(DBG_SCHED_LIMIT * sizeof *seen, GFP_ATOMIC)))
+	seen = kmalloc(DBG_SCHED_LIMIT * sizeof(*seen), GFP_ATOMIC);
+	if (!seen)
 		return 0;
 	seen_count = 0;
 
-	bus = class_get_devdata(class_dev);
+	bus = dev_get_drvdata(buf->dev);
 	hcd = bus_to_hcd(bus);
 	ahcd = hcd_to_admhcd(hcd);
-	next = buf;
+	next = buf->page;
 	size = PAGE_SIZE;
 
 	temp = scnprintf(next, size, "size = %d\n", NUM_INTS);
@@ -500,10 +543,11 @@ show_periodic(struct class_device *class_dev, char *buf)
 	/* dump a snapshot of the periodic schedule (and load) */
 	spin_lock_irqsave(&ahcd->lock, flags);
 	for (i = 0; i < NUM_INTS; i++) {
-		if (!(ed = ahcd->periodic [i]))
+		ed = ahcd->periodic[i];
+		if (!ed)
 			continue;
 
-		temp = scnprintf(next, size, "%2d [%3d]:", i, ahcd->load [i]);
+		temp = scnprintf(next, size, "%2d [%3d]:", i, ahcd->load[i]);
 		size -= temp;
 		next += temp;
 
@@ -513,18 +557,18 @@ show_periodic(struct class_device *class_dev, char *buf)
 			size -= temp;
 			next += temp;
 			for (temp = 0; temp < seen_count; temp++) {
-				if (seen [temp] == ed)
+				if (seen[temp] == ed)
 					break;
 			}
 
 			/* show more info the first time around */
 			if (temp == seen_count) {
-				u32	info = hc32_to_cpu (ahcd, ed->hwINFO);
+				u32	info = hc32_to_cpu(ahcd, ed->hwINFO);
 				struct list_head	*entry;
 				unsigned		qlen = 0;
 
 				/* qlen measured here in TDs, not urbs */
-				list_for_each (entry, &ed->td_list)
+				list_for_each(entry, &ed->td_list)
 					qlen++;
 				temp = scnprintf(next, size,
 					" (%cs dev%d ep%d%s qlen %u"
@@ -544,7 +588,7 @@ show_periodic(struct class_device *class_dev, char *buf)
 				next += temp;
 
 				if (seen_count < DBG_SCHED_LIMIT)
-					seen [seen_count++] = ed;
+					seen[seen_count++] = ed;
 
 				ed = ed->ed_next;
 
@@ -561,17 +605,15 @@ show_periodic(struct class_device *class_dev, char *buf)
 		next += temp;
 	}
 	spin_unlock_irqrestore(&ahcd->lock, flags);
-	kfree (seen);
+	kfree(seen);
 
 	return PAGE_SIZE - size;
 }
-static CLASS_DEVICE_ATTR(periodic, S_IRUGO, show_periodic, NULL);
 
 
 #undef DBG_SCHED_LIMIT
 
-static ssize_t
-show_registers(struct class_device *class_dev, char *buf)
+static ssize_t fill_registers_buffer(struct debug_buffer *buf)
 {
 	struct usb_bus		*bus;
 	struct usb_hcd		*hcd;
@@ -582,11 +624,11 @@ show_registers(struct class_device *class_dev, char *buf)
 	char			*next;
 	u32			rdata;
 
-	bus = class_get_devdata(class_dev);
+	bus = dev_get_drvdata(buf->dev);
 	hcd = bus_to_hcd(bus);
 	ahcd = hcd_to_admhcd(hcd);
 	regs = ahcd->regs;
-	next = buf;
+	next = buf->page;
 	size = PAGE_SIZE;
 
 	spin_lock_irqsave(&ahcd->lock, flags);
@@ -598,7 +640,7 @@ show_registers(struct class_device *class_dev, char *buf)
 		"%s\n"
 		"%s version " DRIVER_VERSION "\n",
 		hcd->self.controller->bus->name,
-		hcd->self.controller->bus_id,
+		dev_name(hcd->self.controller),
 		hcd->product_desc,
 		hcd_name);
 
@@ -647,30 +689,156 @@ done:
 	spin_unlock_irqrestore(&ahcd->lock, flags);
 	return PAGE_SIZE - size;
 }
-static CLASS_DEVICE_ATTR(registers, S_IRUGO, show_registers, NULL);
 
 
-static inline void create_debug_files (struct admhcd *ahcd)
+static struct debug_buffer *alloc_buffer(struct device *dev,
+				ssize_t (*fill_func)(struct debug_buffer *))
 {
-	struct class_device *cldev = admhcd_to_hcd(ahcd)->self.class_dev;
-	int retval;
+	struct debug_buffer *buf;
 
-	retval = class_device_create_file(cldev, &class_device_attr_async);
-	retval = class_device_create_file(cldev, &class_device_attr_periodic);
-	retval = class_device_create_file(cldev, &class_device_attr_registers);
-	admhc_dbg(ahcd, "created debug files\n");
+	buf = kzalloc(sizeof(struct debug_buffer), GFP_KERNEL);
+
+	if (buf) {
+		buf->dev = dev;
+		buf->fill_func = fill_func;
+		mutex_init(&buf->mutex);
+	}
+
+	return buf;
+}
+
+static int fill_buffer(struct debug_buffer *buf)
+{
+	int ret = 0;
+
+	if (!buf->page)
+		buf->page = (char *)get_zeroed_page(GFP_KERNEL);
+
+	if (!buf->page) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
+	ret = buf->fill_func(buf);
+
+	if (ret >= 0) {
+		buf->count = ret;
+		ret = 0;
+	}
+
+out:
+	return ret;
+}
+
+static ssize_t debug_output(struct file *file, char __user *user_buf,
+			size_t len, loff_t *offset)
+{
+	struct debug_buffer *buf = file->private_data;
+	int ret = 0;
+
+	mutex_lock(&buf->mutex);
+	if (buf->count == 0) {
+		ret = fill_buffer(buf);
+		if (ret != 0) {
+			mutex_unlock(&buf->mutex);
+			goto out;
+		}
+	}
+	mutex_unlock(&buf->mutex);
+
+	ret = simple_read_from_buffer(user_buf, len, offset,
+					buf->page, buf->count);
+
+out:
+	return ret;
 }
 
-static inline void remove_debug_files (struct admhcd *ahcd)
+static int debug_close(struct inode *inode, struct file *file)
 {
-	struct class_device *cldev = admhcd_to_hcd(ahcd)->self.class_dev;
+	struct debug_buffer *buf = file->private_data;
 
-	class_device_remove_file(cldev, &class_device_attr_async);
-	class_device_remove_file(cldev, &class_device_attr_periodic);
-	class_device_remove_file(cldev, &class_device_attr_registers);
+	if (buf) {
+		if (buf->page)
+			free_page((unsigned long)buf->page);
+		kfree(buf);
+	}
+
+	return 0;
+}
+
+static int debug_async_open(struct inode *inode, struct file *file)
+{
+	file->private_data = alloc_buffer(inode->i_private, fill_async_buffer);
+
+	return file->private_data ? 0 : -ENOMEM;
+}
+
+static int debug_periodic_open(struct inode *inode, struct file *file)
+{
+	file->private_data = alloc_buffer(inode->i_private,
+						fill_periodic_buffer);
+
+	return file->private_data ? 0 : -ENOMEM;
+}
+
+static int debug_registers_open(struct inode *inode, struct file *file)
+{
+	file->private_data = alloc_buffer(inode->i_private,
+						fill_registers_buffer);
+
+	return file->private_data ? 0 : -ENOMEM;
+}
+
+static inline void create_debug_files(struct admhcd *ahcd)
+{
+	struct usb_bus *bus = &admhcd_to_hcd(ahcd)->self;
+	struct device *dev = bus->dev;
+
+	ahcd->debug_dir = debugfs_create_dir(bus->bus_name, admhc_debug_root);
+	if (!ahcd->debug_dir)
+		goto dir_error;
+
+	ahcd->debug_async = debugfs_create_file("async", S_IRUGO,
+						ahcd->debug_dir, dev,
+						&debug_async_fops);
+	if (!ahcd->debug_async)
+		goto async_error;
+
+	ahcd->debug_periodic = debugfs_create_file("periodic", S_IRUGO,
+						ahcd->debug_dir, dev,
+						&debug_periodic_fops);
+	if (!ahcd->debug_periodic)
+		goto periodic_error;
+
+	ahcd->debug_registers = debugfs_create_file("registers", S_IRUGO,
+						ahcd->debug_dir, dev,
+						&debug_registers_fops);
+	if (!ahcd->debug_registers)
+		goto registers_error;
+
+	admhc_dbg(ahcd, "created debug files\n");
+	return;
+
+registers_error:
+	debugfs_remove(ahcd->debug_periodic);
+periodic_error:
+	debugfs_remove(ahcd->debug_async);
+async_error:
+	debugfs_remove(ahcd->debug_dir);
+dir_error:
+	ahcd->debug_periodic = NULL;
+	ahcd->debug_async = NULL;
+	ahcd->debug_dir = NULL;
+}
+
+static inline void remove_debug_files(struct admhcd *ahcd)
+{
+	debugfs_remove(ahcd->debug_registers);
+	debugfs_remove(ahcd->debug_periodic);
+	debugfs_remove(ahcd->debug_async);
+	debugfs_remove(ahcd->debug_dir);
 }
 
 #endif
 
 /*-------------------------------------------------------------------------*/
-