drivers/usb/dwc3/debugfs.c - LeafOS-Devices/android_kernel_samsung_gta4xl - Gitiles

 /**
  * debugfs.c - DesignWare USB3 DRD Controller DebugFS file
  *
  * Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
  *
  * Authors: Felipe Balbi <balbi@ti.com>,
  *	    Sebastian Andrzej Siewior <bigeasy@linutronix.de>
  *
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2  of
  * the License as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  */

 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/ptrace.h>
 #include <linux/types.h>
 #include <linux/spinlock.h>
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>
 #include <linux/delay.h>
 #include <linux/uaccess.h>

 #include <linux/usb/ch9.h>

 #include "core.h"
 #include "gadget.h"
 #include "io.h"
 #include "debug.h"

 #define dump_register(nm)				\
 {							\
 	.name	= __stringify(nm),			\
 	.offset	= DWC3_ ##nm,				\
 }

 #define dump_ep_register_set(n)			\
 	{					\
 		.name = "DEPCMDPAR2("__stringify(n)")",	\
 		.offset = DWC3_DEP_BASE(n) +	\
 			DWC3_DEPCMDPAR2,	\
 	},					\
 	{					\
 		.name = "DEPCMDPAR1("__stringify(n)")",	\
 		.offset = DWC3_DEP_BASE(n) +	\
 			DWC3_DEPCMDPAR1,	\
 	},					\
 	{					\
 		.name = "DEPCMDPAR0("__stringify(n)")",	\
 		.offset = DWC3_DEP_BASE(n) +	\
 			DWC3_DEPCMDPAR0,	\
 	},					\
 	{					\
 		.name = "DEPCMD("__stringify(n)")",	\
 		.offset = DWC3_DEP_BASE(n) +	\
 			DWC3_DEPCMD,		\
 	}


 static const struct debugfs_reg32 dwc3_regs[] = {
 	dump_register(GSBUSCFG0),
 	dump_register(GSBUSCFG1),
 	dump_register(GTXTHRCFG),
 	dump_register(GRXTHRCFG),
 	dump_register(GCTL),
 	dump_register(GEVTEN),
 	dump_register(GSTS),
 	dump_register(GUCTL1),
 	dump_register(GSNPSID),
 	dump_register(GGPIO),
 	dump_register(GUID),
 	dump_register(GUCTL),
 	dump_register(GBUSERRADDR0),
 	dump_register(GBUSERRADDR1),
 	dump_register(GPRTBIMAP0),
 	dump_register(GPRTBIMAP1),
 	dump_register(GHWPARAMS0),
 	dump_register(GHWPARAMS1),
 	dump_register(GHWPARAMS2),
 	dump_register(GHWPARAMS3),
 	dump_register(GHWPARAMS4),
 	dump_register(GHWPARAMS5),
 	dump_register(GHWPARAMS6),
 	dump_register(GHWPARAMS7),
 	dump_register(GDBGFIFOSPACE),
 	dump_register(GDBGLTSSM),
 	dump_register(GPRTBIMAP_HS0),
 	dump_register(GPRTBIMAP_HS1),
 	dump_register(GPRTBIMAP_FS0),
 	dump_register(GPRTBIMAP_FS1),

 	dump_register(GUSB2PHYCFG(0)),
 	dump_register(GUSB2PHYCFG(1)),
 	dump_register(GUSB2PHYCFG(2)),
 	dump_register(GUSB2PHYCFG(3)),
 	dump_register(GUSB2PHYCFG(4)),
 	dump_register(GUSB2PHYCFG(5)),
 	dump_register(GUSB2PHYCFG(6)),
 	dump_register(GUSB2PHYCFG(7)),
 	dump_register(GUSB2PHYCFG(8)),
 	dump_register(GUSB2PHYCFG(9)),
 	dump_register(GUSB2PHYCFG(10)),
 	dump_register(GUSB2PHYCFG(11)),
 	dump_register(GUSB2PHYCFG(12)),
 	dump_register(GUSB2PHYCFG(13)),
 	dump_register(GUSB2PHYCFG(14)),
 	dump_register(GUSB2PHYCFG(15)),

 	dump_register(GUSB2I2CCTL(0)),
 	dump_register(GUSB2I2CCTL(1)),
 	dump_register(GUSB2I2CCTL(2)),
 	dump_register(GUSB2I2CCTL(3)),
 	dump_register(GUSB2I2CCTL(4)),
 	dump_register(GUSB2I2CCTL(5)),
 	dump_register(GUSB2I2CCTL(6)),
 	dump_register(GUSB2I2CCTL(7)),
 	dump_register(GUSB2I2CCTL(8)),
 	dump_register(GUSB2I2CCTL(9)),
 	dump_register(GUSB2I2CCTL(10)),
 	dump_register(GUSB2I2CCTL(11)),
 	dump_register(GUSB2I2CCTL(12)),
 	dump_register(GUSB2I2CCTL(13)),
 	dump_register(GUSB2I2CCTL(14)),
 	dump_register(GUSB2I2CCTL(15)),

 	dump_register(GUSB2PHYACC(0)),
 	dump_register(GUSB2PHYACC(1)),
 	dump_register(GUSB2PHYACC(2)),
 	dump_register(GUSB2PHYACC(3)),
 	dump_register(GUSB2PHYACC(4)),
 	dump_register(GUSB2PHYACC(5)),
 	dump_register(GUSB2PHYACC(6)),
 	dump_register(GUSB2PHYACC(7)),
 	dump_register(GUSB2PHYACC(8)),
 	dump_register(GUSB2PHYACC(9)),
 	dump_register(GUSB2PHYACC(10)),
 	dump_register(GUSB2PHYACC(11)),
 	dump_register(GUSB2PHYACC(12)),
 	dump_register(GUSB2PHYACC(13)),
 	dump_register(GUSB2PHYACC(14)),
 	dump_register(GUSB2PHYACC(15)),

 	dump_register(GUSB3PIPECTL(0)),
 	dump_register(GUSB3PIPECTL(1)),
 	dump_register(GUSB3PIPECTL(2)),
 	dump_register(GUSB3PIPECTL(3)),
 	dump_register(GUSB3PIPECTL(4)),
 	dump_register(GUSB3PIPECTL(5)),
 	dump_register(GUSB3PIPECTL(6)),
 	dump_register(GUSB3PIPECTL(7)),
 	dump_register(GUSB3PIPECTL(8)),
 	dump_register(GUSB3PIPECTL(9)),
 	dump_register(GUSB3PIPECTL(10)),
 	dump_register(GUSB3PIPECTL(11)),
 	dump_register(GUSB3PIPECTL(12)),
 	dump_register(GUSB3PIPECTL(13)),
 	dump_register(GUSB3PIPECTL(14)),
 	dump_register(GUSB3PIPECTL(15)),

 	dump_register(GTXFIFOSIZ(0)),
 	dump_register(GTXFIFOSIZ(1)),
 	dump_register(GTXFIFOSIZ(2)),
 	dump_register(GTXFIFOSIZ(3)),
 	dump_register(GTXFIFOSIZ(4)),
 	dump_register(GTXFIFOSIZ(5)),
 	dump_register(GTXFIFOSIZ(6)),
 	dump_register(GTXFIFOSIZ(7)),
 	dump_register(GTXFIFOSIZ(8)),
 	dump_register(GTXFIFOSIZ(9)),
 	dump_register(GTXFIFOSIZ(10)),
 	dump_register(GTXFIFOSIZ(11)),
 	dump_register(GTXFIFOSIZ(12)),
 	dump_register(GTXFIFOSIZ(13)),
 	dump_register(GTXFIFOSIZ(14)),
 	dump_register(GTXFIFOSIZ(15)),
 	dump_register(GTXFIFOSIZ(16)),
 	dump_register(GTXFIFOSIZ(17)),
 	dump_register(GTXFIFOSIZ(18)),
 	dump_register(GTXFIFOSIZ(19)),
 	dump_register(GTXFIFOSIZ(20)),
 	dump_register(GTXFIFOSIZ(21)),
 	dump_register(GTXFIFOSIZ(22)),
 	dump_register(GTXFIFOSIZ(23)),
 	dump_register(GTXFIFOSIZ(24)),
 	dump_register(GTXFIFOSIZ(25)),
 	dump_register(GTXFIFOSIZ(26)),
 	dump_register(GTXFIFOSIZ(27)),
 	dump_register(GTXFIFOSIZ(28)),
 	dump_register(GTXFIFOSIZ(29)),
 	dump_register(GTXFIFOSIZ(30)),
 	dump_register(GTXFIFOSIZ(31)),

 	dump_register(GRXFIFOSIZ(0)),
 	dump_register(GRXFIFOSIZ(1)),
 	dump_register(GRXFIFOSIZ(2)),
 	dump_register(GRXFIFOSIZ(3)),
 	dump_register(GRXFIFOSIZ(4)),
 	dump_register(GRXFIFOSIZ(5)),
 	dump_register(GRXFIFOSIZ(6)),
 	dump_register(GRXFIFOSIZ(7)),
 	dump_register(GRXFIFOSIZ(8)),
 	dump_register(GRXFIFOSIZ(9)),
 	dump_register(GRXFIFOSIZ(10)),
 	dump_register(GRXFIFOSIZ(11)),
 	dump_register(GRXFIFOSIZ(12)),
 	dump_register(GRXFIFOSIZ(13)),
 	dump_register(GRXFIFOSIZ(14)),
 	dump_register(GRXFIFOSIZ(15)),
 	dump_register(GRXFIFOSIZ(16)),
 	dump_register(GRXFIFOSIZ(17)),
 	dump_register(GRXFIFOSIZ(18)),
 	dump_register(GRXFIFOSIZ(19)),
 	dump_register(GRXFIFOSIZ(20)),
 	dump_register(GRXFIFOSIZ(21)),
 	dump_register(GRXFIFOSIZ(22)),
 	dump_register(GRXFIFOSIZ(23)),
 	dump_register(GRXFIFOSIZ(24)),
 	dump_register(GRXFIFOSIZ(25)),
 	dump_register(GRXFIFOSIZ(26)),
 	dump_register(GRXFIFOSIZ(27)),
 	dump_register(GRXFIFOSIZ(28)),
 	dump_register(GRXFIFOSIZ(29)),
 	dump_register(GRXFIFOSIZ(30)),
 	dump_register(GRXFIFOSIZ(31)),

 	dump_register(GEVNTADRLO(0)),
 	dump_register(GEVNTADRHI(0)),
 	dump_register(GEVNTSIZ(0)),
 	dump_register(GEVNTCOUNT(0)),

 	dump_register(GHWPARAMS8),
 	dump_register(DCFG),
 	dump_register(DCTL),
 	dump_register(DEVTEN),
 	dump_register(DSTS),
 	dump_register(DGCMDPAR),
 	dump_register(DGCMD),
 	dump_register(DALEPENA),

 	dump_ep_register_set(0),
 	dump_ep_register_set(1),
 	dump_ep_register_set(2),
 	dump_ep_register_set(3),
 	dump_ep_register_set(4),
 	dump_ep_register_set(5),
 	dump_ep_register_set(6),
 	dump_ep_register_set(7),
 	dump_ep_register_set(8),
 	dump_ep_register_set(9),
 	dump_ep_register_set(10),
 	dump_ep_register_set(11),
 	dump_ep_register_set(12),
 	dump_ep_register_set(13),
 	dump_ep_register_set(14),
 	dump_ep_register_set(15),
 	dump_ep_register_set(16),
 	dump_ep_register_set(17),
 	dump_ep_register_set(18),
 	dump_ep_register_set(19),
 	dump_ep_register_set(20),
 	dump_ep_register_set(21),
 	dump_ep_register_set(22),
 	dump_ep_register_set(23),
 	dump_ep_register_set(24),
 	dump_ep_register_set(25),
 	dump_ep_register_set(26),
 	dump_ep_register_set(27),
 	dump_ep_register_set(28),
 	dump_ep_register_set(29),
 	dump_ep_register_set(30),
 	dump_ep_register_set(31),

 	dump_register(OCFG),
 	dump_register(OCTL),
 	dump_register(OEVT),
 	dump_register(OEVTEN),
 	dump_register(OSTS),
 };

 static int dwc3_mode_show(struct seq_file *s, void *unused)
 {
 	struct dwc3		*dwc = s->private;
 	unsigned long		flags;
 	u32			reg;

 	spin_lock_irqsave(&dwc->lock, flags);
 	reg = dwc3_readl(dwc->regs, DWC3_GCTL);
 	spin_unlock_irqrestore(&dwc->lock, flags);

 	switch (DWC3_GCTL_PRTCAP(reg)) {
 	case DWC3_GCTL_PRTCAP_HOST:
 		seq_printf(s, "host\n");
 		break;
 	case DWC3_GCTL_PRTCAP_DEVICE:
 		seq_printf(s, "device\n");
 		break;
 	case DWC3_GCTL_PRTCAP_OTG:
 		seq_printf(s, "otg\n");
 		break;
 	default:
 		seq_printf(s, "UNKNOWN %08x\n", DWC3_GCTL_PRTCAP(reg));
 	}

 	return 0;
 }

 static int dwc3_mode_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, dwc3_mode_show, inode->i_private);
 }

 static ssize_t dwc3_mode_write(struct file *file,
 		const char __user *ubuf, size_t count, loff_t *ppos)
 {
 	struct seq_file		*s = file->private_data;
 	struct dwc3		*dwc = s->private;
 	u32			mode = 0;
 	char			buf[32];

 	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
 		return -EFAULT;

 	if (!strncmp(buf, "host", 4))
 		mode = DWC3_GCTL_PRTCAP_HOST;

 	if (!strncmp(buf, "device", 6))
 		mode = DWC3_GCTL_PRTCAP_DEVICE;

 	if (!strncmp(buf, "otg", 3))
 		mode = DWC3_GCTL_PRTCAP_OTG;

 	dwc3_set_mode(dwc, mode);

 	return count;
 }

 static const struct file_operations dwc3_mode_fops = {
 	.open			= dwc3_mode_open,
 	.write			= dwc3_mode_write,
 	.read			= seq_read,
 	.llseek			= seq_lseek,
 	.release		= single_release,
 };

 static int dwc3_testmode_show(struct seq_file *s, void *unused)
 {
 	struct dwc3		*dwc = s->private;
 	unsigned long		flags;
 	u32			reg;

 	spin_lock_irqsave(&dwc->lock, flags);
 	reg = dwc3_readl(dwc->regs, DWC3_DCTL);
 	reg &= DWC3_DCTL_TSTCTRL_MASK;
 	reg >>= 1;
 	spin_unlock_irqrestore(&dwc->lock, flags);

 	switch (reg) {
 	case 0:
 		seq_printf(s, "no test\n");
 		break;
 	case TEST_J:
 		seq_printf(s, "test_j\n");
 		break;
 	case TEST_K:
 		seq_printf(s, "test_k\n");
 		break;
 	case TEST_SE0_NAK:
 		seq_printf(s, "test_se0_nak\n");
 		break;
 	case TEST_PACKET:
 		seq_printf(s, "test_packet\n");
 		break;
 	case TEST_FORCE_EN:
 		seq_printf(s, "test_force_enable\n");
 		break;
 	default:
 		seq_printf(s, "UNKNOWN %d\n", reg);
 	}

 	return 0;
 }

 static int dwc3_testmode_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, dwc3_testmode_show, inode->i_private);
 }

 static ssize_t dwc3_testmode_write(struct file *file,
 		const char __user *ubuf, size_t count, loff_t *ppos)
 {
 	struct seq_file		*s = file->private_data;
 	struct dwc3		*dwc = s->private;
 	unsigned long		flags;
 	u32			testmode = 0;
 	char			buf[32];

 	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
 		return -EFAULT;

 	if (!strncmp(buf, "test_j", 6))
 		testmode = TEST_J;
 	else if (!strncmp(buf, "test_k", 6))
 		testmode = TEST_K;
 	else if (!strncmp(buf, "test_se0_nak", 12))
 		testmode = TEST_SE0_NAK;
 	else if (!strncmp(buf, "test_packet", 11))
 		testmode = TEST_PACKET;
 	else if (!strncmp(buf, "test_force_enable", 17))
 		testmode = TEST_FORCE_EN;
 	else
 		testmode = 0;

 	spin_lock_irqsave(&dwc->lock, flags);
 	dwc3_gadget_set_test_mode(dwc, testmode);
 	spin_unlock_irqrestore(&dwc->lock, flags);

 	return count;
 }

 static const struct file_operations dwc3_testmode_fops = {
 	.open			= dwc3_testmode_open,
 	.write			= dwc3_testmode_write,
 	.read			= seq_read,
 	.llseek			= seq_lseek,
 	.release		= single_release,
 };

 static int dwc3_link_state_show(struct seq_file *s, void *unused)
 {
 	struct dwc3		*dwc = s->private;
 	unsigned long		flags;
 	enum dwc3_link_state	state;
 	u32			reg;
 	u8			speed;

 	spin_lock_irqsave(&dwc->lock, flags);
 	reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 	state = DWC3_DSTS_USBLNKST(reg);
 	speed = reg & DWC3_DSTS_CONNECTSPD;

 	seq_printf(s, "%s\n", (speed >= DWC3_DSTS_SUPERSPEED) ?
 		   dwc3_gadget_link_string(state) :
 		   dwc3_gadget_hs_link_string(state));
 	spin_unlock_irqrestore(&dwc->lock, flags);

 	return 0;
 }

 static int dwc3_link_state_open(struct inode *inode, struct file *file)
 {
 	return single_open(file, dwc3_link_state_show, inode->i_private);
 }

 static ssize_t dwc3_link_state_write(struct file *file,
 		const char __user *ubuf, size_t count, loff_t *ppos)
 {
 	struct seq_file		*s = file->private_data;
 	struct dwc3		*dwc = s->private;
 	unsigned long		flags;
 	enum dwc3_link_state	state = 0;
 	char			buf[32];
 	u32			reg;
 	u8			speed;

 	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
 		return -EFAULT;

 	if (!strncmp(buf, "SS.Disabled", 11))
 		state = DWC3_LINK_STATE_SS_DIS;
 	else if (!strncmp(buf, "Rx.Detect", 9))
 		state = DWC3_LINK_STATE_RX_DET;
 	else if (!strncmp(buf, "SS.Inactive", 11))
 		state = DWC3_LINK_STATE_SS_INACT;
 	else if (!strncmp(buf, "Recovery", 8))
 		state = DWC3_LINK_STATE_RECOV;
 	else if (!strncmp(buf, "Compliance", 10))
 		state = DWC3_LINK_STATE_CMPLY;
 	else if (!strncmp(buf, "Loopback", 8))
 		state = DWC3_LINK_STATE_LPBK;
 	else
 		return -EINVAL;

 	spin_lock_irqsave(&dwc->lock, flags);
 	reg = dwc3_readl(dwc->regs, DWC3_DSTS);
 	speed = reg & DWC3_DSTS_CONNECTSPD;

 	if (speed < DWC3_DSTS_SUPERSPEED &&
 	    state != DWC3_LINK_STATE_RECOV) {
 		spin_unlock_irqrestore(&dwc->lock, flags);
 		return -EINVAL;
 	}

 	dwc3_gadget_set_link_state(dwc, state);
 	spin_unlock_irqrestore(&dwc->lock, flags);

 	return count;
 }

 static const struct file_operations dwc3_link_state_fops = {
 	.open			= dwc3_link_state_open,
 	.write			= dwc3_link_state_write,
 	.read			= seq_read,
 	.llseek			= seq_lseek,
 	.release		= single_release,
 };

 struct dwc3_ep_file_map {
 	char name[25];
 	int (*show)(struct seq_file *s, void *unused);
 };

 static int dwc3_tx_fifo_queue_show(struct seq_file *s, void *unused)
 {
 	struct dwc3_ep		*dep = s->private;
 	struct dwc3		*dwc = dep->dwc;
 	unsigned long		flags;
 	u32			val;

 	spin_lock_irqsave(&dwc->lock, flags);
 	val = dwc3_core_fifo_space(dep, DWC3_TXFIFOQ);
 	seq_printf(s, "%u\n", val);
 	spin_unlock_irqrestore(&dwc->lock, flags);

 	return 0;
 }

 static int dwc3_rx_fifo_queue_show(struct seq_file *s, void *unused)
 {
 	struct dwc3_ep		*dep = s->private;
 	struct dwc3		*dwc = dep->dwc;
 	unsigned long		flags;
 	u32			val;

 	spin_lock_irqsave(&dwc->lock, flags);
 	val = dwc3_core_fifo_space(dep, DWC3_RXFIFOQ);
 	seq_printf(s, "%u\n", val);
 	spin_unlock_irqrestore(&dwc->lock, flags);

 	return 0;
 }

 static int dwc3_tx_request_queue_show(struct seq_file *s, void *unused)
 {
 	struct dwc3_ep		*dep = s->private;
 	struct dwc3		*dwc = dep->dwc;
 	unsigned long		flags;
 	u32			val;

 	spin_lock_irqsave(&dwc->lock, flags);
 	val = dwc3_core_fifo_space(dep, DWC3_TXREQQ);
 	seq_printf(s, "%u\n", val);
 	spin_unlock_irqrestore(&dwc->lock, flags);

 	return 0;
 }

 static int dwc3_rx_request_queue_show(struct seq_file *s, void *unused)
 {
 	struct dwc3_ep		*dep = s->private;
 	struct dwc3		*dwc = dep->dwc;
 	unsigned long		flags;
 	u32			val;

 	spin_lock_irqsave(&dwc->lock, flags);
 	val = dwc3_core_fifo_space(dep, DWC3_RXREQQ);
 	seq_printf(s, "%u\n", val);
 	spin_unlock_irqrestore(&dwc->lock, flags);

 	return 0;
 }

 static int dwc3_rx_info_queue_show(struct seq_file *s, void *unused)
 {
 	struct dwc3_ep		*dep = s->private;
 	struct dwc3		*dwc = dep->dwc;
 	unsigned long		flags;
 	u32			val;

 	spin_lock_irqsave(&dwc->lock, flags);
 	val = dwc3_core_fifo_space(dep, DWC3_RXINFOQ);
 	seq_printf(s, "%u\n", val);
 	spin_unlock_irqrestore(&dwc->lock, flags);

 	return 0;
 }

 static int dwc3_descriptor_fetch_queue_show(struct seq_file *s, void *unused)
 {
 	struct dwc3_ep		*dep = s->private;
 	struct dwc3		*dwc = dep->dwc;
 	unsigned long		flags;
 	u32			val;

 	spin_lock_irqsave(&dwc->lock, flags);
 	val = dwc3_core_fifo_space(dep, DWC3_DESCFETCHQ);
 	seq_printf(s, "%u\n", val);
 	spin_unlock_irqrestore(&dwc->lock, flags);

 	return 0;
 }

 static int dwc3_event_queue_show(struct seq_file *s, void *unused)
 {
 	struct dwc3_ep		*dep = s->private;
 	struct dwc3		*dwc = dep->dwc;
 	unsigned long		flags;
 	u32			val;

 	spin_lock_irqsave(&dwc->lock, flags);
 	val = dwc3_core_fifo_space(dep, DWC3_EVENTQ);
 	seq_printf(s, "%u\n", val);
 	spin_unlock_irqrestore(&dwc->lock, flags);

 	return 0;
 }

 static int dwc3_ep_transfer_type_show(struct seq_file *s, void *unused)
 {
 	struct dwc3_ep		*dep = s->private;
 	struct dwc3		*dwc = dep->dwc;
 	unsigned long		flags;

 	spin_lock_irqsave(&dwc->lock, flags);
 	if (!(dep->flags & DWC3_EP_ENABLED) ||
 			!dep->endpoint.desc) {
 		seq_printf(s, "--\n");
 		goto out;
 	}

 	switch (usb_endpoint_type(dep->endpoint.desc)) {
 	case USB_ENDPOINT_XFER_CONTROL:
 		seq_printf(s, "control\n");
 		break;
 	case USB_ENDPOINT_XFER_ISOC:
 		seq_printf(s, "isochronous\n");
 		break;
 	case USB_ENDPOINT_XFER_BULK:
 		seq_printf(s, "bulk\n");
 		break;
 	case USB_ENDPOINT_XFER_INT:
 		seq_printf(s, "interrupt\n");
 		break;
 	default:
 		seq_printf(s, "--\n");
 	}

 out:
 	spin_unlock_irqrestore(&dwc->lock, flags);

 	return 0;
 }

 static int dwc3_ep_trb_ring_show(struct seq_file *s, void *unused)
 {
 	struct dwc3_ep		*dep = s->private;
 	struct dwc3		*dwc = dep->dwc;
 	unsigned long		flags;
 	int			i;

 	spin_lock_irqsave(&dwc->lock, flags);
 	if (dep->number <= 1) {
 		seq_printf(s, "--\n");
 		goto out;
 	}

 	seq_printf(s, "buffer_addr,size,type,ioc,isp_imi,csp,chn,lst,hwo\n");

 	for (i = 0; i < DWC3_TRB_NUM; i++) {
 		struct dwc3_trb *trb = &dep->trb_pool[i];
 		unsigned int type = DWC3_TRBCTL_TYPE(trb->ctrl);

 		seq_printf(s, "%08x%08x,%d,%s,%d,%d,%d,%d,%d,%d       %c%c\n",
 				trb->bph, trb->bpl, trb->size,
 				dwc3_trb_type_string(type),
 				!!(trb->ctrl & DWC3_TRB_CTRL_IOC),
 				!!(trb->ctrl & DWC3_TRB_CTRL_ISP_IMI),
 				!!(trb->ctrl & DWC3_TRB_CTRL_CSP),
 				!!(trb->ctrl & DWC3_TRB_CTRL_CHN),
 				!!(trb->ctrl & DWC3_TRB_CTRL_LST),
 				!!(trb->ctrl & DWC3_TRB_CTRL_HWO),
 				dep->trb_enqueue == i ? 'E' : ' ',
 				dep->trb_dequeue == i ? 'D' : ' ');
 	}

 out:
 	spin_unlock_irqrestore(&dwc->lock, flags);

 	return 0;
 }

 static struct dwc3_ep_file_map map[] = {
 	{ "tx_fifo_queue", dwc3_tx_fifo_queue_show, },
 	{ "rx_fifo_queue", dwc3_rx_fifo_queue_show, },
 	{ "tx_request_queue", dwc3_tx_request_queue_show, },
 	{ "rx_request_queue", dwc3_rx_request_queue_show, },
 	{ "rx_info_queue", dwc3_rx_info_queue_show, },
 	{ "descriptor_fetch_queue", dwc3_descriptor_fetch_queue_show, },
 	{ "event_queue", dwc3_event_queue_show, },
 	{ "transfer_type", dwc3_ep_transfer_type_show, },
 	{ "trb_ring", dwc3_ep_trb_ring_show, },
 };

 static int dwc3_endpoint_open(struct inode *inode, struct file *file)
 {
 	const char		*file_name = file_dentry(file)->d_iname;
 	struct dwc3_ep_file_map	*f_map;
 	int			i;

 	for (i = 0; i < ARRAY_SIZE(map); i++) {
 		f_map = &map[i];

 		if (strcmp(f_map->name, file_name) == 0)
 			break;
 	}

 	return single_open(file, f_map->show, inode->i_private);
 }

 static const struct file_operations dwc3_endpoint_fops = {
 	.open			= dwc3_endpoint_open,
 	.read			= seq_read,
 	.llseek			= seq_lseek,
 	.release		= single_release,
 };

 static void dwc3_debugfs_create_endpoint_file(struct dwc3_ep *dep,
 		struct dentry *parent, int type)
 {
 	struct dentry		*file;
 	struct dwc3_ep_file_map	*ep_file = &map[type];

 	file = debugfs_create_file(ep_file->name, S_IRUGO, parent, dep,
 			&dwc3_endpoint_fops);
 }

 static void dwc3_debugfs_create_endpoint_files(struct dwc3_ep *dep,
 		struct dentry *parent)
 {
 	int			i;

 	for (i = 0; i < ARRAY_SIZE(map); i++)
 		dwc3_debugfs_create_endpoint_file(dep, parent, i);
 }

 static void dwc3_debugfs_create_endpoint_dir(struct dwc3_ep *dep,
 		struct dentry *parent)
 {
 	struct dentry		*dir;

 	dir = debugfs_create_dir(dep->name, parent);
 	if (IS_ERR_OR_NULL(dir))
 		return;

 	dwc3_debugfs_create_endpoint_files(dep, dir);
 }

 static void dwc3_debugfs_create_endpoint_dirs(struct dwc3 *dwc,
 		struct dentry *parent)
 {
 	int			i;

 	for (i = 0; i < dwc->num_eps; i++) {
 		struct dwc3_ep	*dep = dwc->eps[i];

 		if (!dep)
 			continue;

 		dwc3_debugfs_create_endpoint_dir(dep, parent);
 	}
 }

 void dwc3_debugfs_init(struct dwc3 *dwc)
 {
 	struct dentry		*root;
 	struct dentry           *file;

 	root = debugfs_create_dir(dev_name(dwc->dev), NULL);
 	if (IS_ERR_OR_NULL(root)) {
 		if (!root)
 			dev_err(dwc->dev, "Can't create debugfs root\n");
 		return;
 	}
 	dwc->root = root;

 	dwc->regset = kzalloc(sizeof(*dwc->regset), GFP_KERNEL);
 	if (!dwc->regset) {
 		debugfs_remove_recursive(root);
 		return;
 	}

 	dwc->regset->regs = dwc3_regs;
 	dwc->regset->nregs = ARRAY_SIZE(dwc3_regs);
 	dwc->regset->base = dwc->regs - DWC3_GLOBALS_REGS_START;

 	file = debugfs_create_regset32("regdump", S_IRUGO, root, dwc->regset);
 	if (!file)
 		dev_dbg(dwc->dev, "Can't create debugfs regdump\n");

 	if (IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)) {
 		file = debugfs_create_file("mode", S_IRUGO | S_IWUSR, root,
 				dwc, &dwc3_mode_fops);
 		if (!file)
 			dev_dbg(dwc->dev, "Can't create debugfs mode\n");
 	}

 	if (IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE) ||
 			IS_ENABLED(CONFIG_USB_DWC3_GADGET)) {
 		file = debugfs_create_file("testmode", S_IRUGO | S_IWUSR, root,
 				dwc, &dwc3_testmode_fops);
 		if (!file)
 			dev_dbg(dwc->dev, "Can't create debugfs testmode\n");

 		file = debugfs_create_file("link_state", S_IRUGO | S_IWUSR,
 				root, dwc, &dwc3_link_state_fops);
 		if (!file)
 			dev_dbg(dwc->dev, "Can't create debugfs link_state\n");

 		dwc3_debugfs_create_endpoint_dirs(dwc, root);
 	}
 }

 void dwc3_debugfs_exit(struct dwc3 *dwc)
 {
 	debugfs_remove_recursive(dwc->root);
 	kfree(dwc->regset);
 }
	/**
	* debugfs.c - DesignWare USB3 DRD Controller DebugFS file
	*
	* Copyright (C) 2010-2011 Texas Instruments Incorporated - http://www.ti.com
	*
	* Authors: Felipe Balbi <balbi@ti.com>,
	* Sebastian Andrzej Siewior <bigeasy@linutronix.de>
	*
	* This program is free software: you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 of
	* the License as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful,
	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	* GNU General Public License for more details.
	*/

	#include <linux/kernel.h>
	#include <linux/slab.h>
	#include <linux/ptrace.h>
	#include <linux/types.h>
	#include <linux/spinlock.h>
	#include <linux/debugfs.h>
	#include <linux/seq_file.h>
	#include <linux/delay.h>
	#include <linux/uaccess.h>

	#include <linux/usb/ch9.h>

	#include "core.h"
	#include "gadget.h"
	#include "io.h"
	#include "debug.h"

	#define dump_register(nm) \
	{ \
	.name = __stringify(nm), \
	.offset = DWC3_ ##nm, \
	}

	#define dump_ep_register_set(n) \
	{ \
	.name = "DEPCMDPAR2("__stringify(n)")", \
	.offset = DWC3_DEP_BASE(n) + \
	DWC3_DEPCMDPAR2, \
	}, \
	{ \
	.name = "DEPCMDPAR1("__stringify(n)")", \
	.offset = DWC3_DEP_BASE(n) + \
	DWC3_DEPCMDPAR1, \
	}, \
	{ \
	.name = "DEPCMDPAR0("__stringify(n)")", \
	.offset = DWC3_DEP_BASE(n) + \
	DWC3_DEPCMDPAR0, \
	}, \
	{ \
	.name = "DEPCMD("__stringify(n)")", \
	.offset = DWC3_DEP_BASE(n) + \
	DWC3_DEPCMD, \
	}


	static const struct debugfs_reg32 dwc3_regs[] = {
	dump_register(GSBUSCFG0),
	dump_register(GSBUSCFG1),
	dump_register(GTXTHRCFG),
	dump_register(GRXTHRCFG),
	dump_register(GCTL),
	dump_register(GEVTEN),
	dump_register(GSTS),
	dump_register(GUCTL1),
	dump_register(GSNPSID),
	dump_register(GGPIO),
	dump_register(GUID),
	dump_register(GUCTL),
	dump_register(GBUSERRADDR0),
	dump_register(GBUSERRADDR1),
	dump_register(GPRTBIMAP0),
	dump_register(GPRTBIMAP1),
	dump_register(GHWPARAMS0),
	dump_register(GHWPARAMS1),
	dump_register(GHWPARAMS2),
	dump_register(GHWPARAMS3),
	dump_register(GHWPARAMS4),
	dump_register(GHWPARAMS5),
	dump_register(GHWPARAMS6),
	dump_register(GHWPARAMS7),
	dump_register(GDBGFIFOSPACE),
	dump_register(GDBGLTSSM),
	dump_register(GPRTBIMAP_HS0),
	dump_register(GPRTBIMAP_HS1),
	dump_register(GPRTBIMAP_FS0),
	dump_register(GPRTBIMAP_FS1),

	dump_register(GUSB2PHYCFG(0)),
	dump_register(GUSB2PHYCFG(1)),
	dump_register(GUSB2PHYCFG(2)),
	dump_register(GUSB2PHYCFG(3)),
	dump_register(GUSB2PHYCFG(4)),
	dump_register(GUSB2PHYCFG(5)),
	dump_register(GUSB2PHYCFG(6)),
	dump_register(GUSB2PHYCFG(7)),
	dump_register(GUSB2PHYCFG(8)),
	dump_register(GUSB2PHYCFG(9)),
	dump_register(GUSB2PHYCFG(10)),
	dump_register(GUSB2PHYCFG(11)),
	dump_register(GUSB2PHYCFG(12)),
	dump_register(GUSB2PHYCFG(13)),
	dump_register(GUSB2PHYCFG(14)),
	dump_register(GUSB2PHYCFG(15)),

	dump_register(GUSB2I2CCTL(0)),
	dump_register(GUSB2I2CCTL(1)),
	dump_register(GUSB2I2CCTL(2)),
	dump_register(GUSB2I2CCTL(3)),
	dump_register(GUSB2I2CCTL(4)),
	dump_register(GUSB2I2CCTL(5)),
	dump_register(GUSB2I2CCTL(6)),
	dump_register(GUSB2I2CCTL(7)),
	dump_register(GUSB2I2CCTL(8)),
	dump_register(GUSB2I2CCTL(9)),
	dump_register(GUSB2I2CCTL(10)),
	dump_register(GUSB2I2CCTL(11)),
	dump_register(GUSB2I2CCTL(12)),
	dump_register(GUSB2I2CCTL(13)),
	dump_register(GUSB2I2CCTL(14)),
	dump_register(GUSB2I2CCTL(15)),

	dump_register(GUSB2PHYACC(0)),
	dump_register(GUSB2PHYACC(1)),
	dump_register(GUSB2PHYACC(2)),
	dump_register(GUSB2PHYACC(3)),
	dump_register(GUSB2PHYACC(4)),
	dump_register(GUSB2PHYACC(5)),
	dump_register(GUSB2PHYACC(6)),
	dump_register(GUSB2PHYACC(7)),
	dump_register(GUSB2PHYACC(8)),
	dump_register(GUSB2PHYACC(9)),
	dump_register(GUSB2PHYACC(10)),
	dump_register(GUSB2PHYACC(11)),
	dump_register(GUSB2PHYACC(12)),
	dump_register(GUSB2PHYACC(13)),
	dump_register(GUSB2PHYACC(14)),
	dump_register(GUSB2PHYACC(15)),

	dump_register(GUSB3PIPECTL(0)),
	dump_register(GUSB3PIPECTL(1)),
	dump_register(GUSB3PIPECTL(2)),
	dump_register(GUSB3PIPECTL(3)),
	dump_register(GUSB3PIPECTL(4)),
	dump_register(GUSB3PIPECTL(5)),
	dump_register(GUSB3PIPECTL(6)),
	dump_register(GUSB3PIPECTL(7)),
	dump_register(GUSB3PIPECTL(8)),
	dump_register(GUSB3PIPECTL(9)),
	dump_register(GUSB3PIPECTL(10)),
	dump_register(GUSB3PIPECTL(11)),
	dump_register(GUSB3PIPECTL(12)),
	dump_register(GUSB3PIPECTL(13)),
	dump_register(GUSB3PIPECTL(14)),
	dump_register(GUSB3PIPECTL(15)),

	dump_register(GTXFIFOSIZ(0)),
	dump_register(GTXFIFOSIZ(1)),
	dump_register(GTXFIFOSIZ(2)),
	dump_register(GTXFIFOSIZ(3)),
	dump_register(GTXFIFOSIZ(4)),
	dump_register(GTXFIFOSIZ(5)),
	dump_register(GTXFIFOSIZ(6)),
	dump_register(GTXFIFOSIZ(7)),
	dump_register(GTXFIFOSIZ(8)),
	dump_register(GTXFIFOSIZ(9)),
	dump_register(GTXFIFOSIZ(10)),
	dump_register(GTXFIFOSIZ(11)),
	dump_register(GTXFIFOSIZ(12)),
	dump_register(GTXFIFOSIZ(13)),
	dump_register(GTXFIFOSIZ(14)),
	dump_register(GTXFIFOSIZ(15)),
	dump_register(GTXFIFOSIZ(16)),
	dump_register(GTXFIFOSIZ(17)),
	dump_register(GTXFIFOSIZ(18)),
	dump_register(GTXFIFOSIZ(19)),
	dump_register(GTXFIFOSIZ(20)),
	dump_register(GTXFIFOSIZ(21)),
	dump_register(GTXFIFOSIZ(22)),
	dump_register(GTXFIFOSIZ(23)),
	dump_register(GTXFIFOSIZ(24)),
	dump_register(GTXFIFOSIZ(25)),
	dump_register(GTXFIFOSIZ(26)),
	dump_register(GTXFIFOSIZ(27)),
	dump_register(GTXFIFOSIZ(28)),
	dump_register(GTXFIFOSIZ(29)),
	dump_register(GTXFIFOSIZ(30)),
	dump_register(GTXFIFOSIZ(31)),

	dump_register(GRXFIFOSIZ(0)),
	dump_register(GRXFIFOSIZ(1)),
	dump_register(GRXFIFOSIZ(2)),
	dump_register(GRXFIFOSIZ(3)),
	dump_register(GRXFIFOSIZ(4)),
	dump_register(GRXFIFOSIZ(5)),
	dump_register(GRXFIFOSIZ(6)),
	dump_register(GRXFIFOSIZ(7)),
	dump_register(GRXFIFOSIZ(8)),
	dump_register(GRXFIFOSIZ(9)),
	dump_register(GRXFIFOSIZ(10)),
	dump_register(GRXFIFOSIZ(11)),
	dump_register(GRXFIFOSIZ(12)),
	dump_register(GRXFIFOSIZ(13)),
	dump_register(GRXFIFOSIZ(14)),
	dump_register(GRXFIFOSIZ(15)),
	dump_register(GRXFIFOSIZ(16)),
	dump_register(GRXFIFOSIZ(17)),
	dump_register(GRXFIFOSIZ(18)),
	dump_register(GRXFIFOSIZ(19)),
	dump_register(GRXFIFOSIZ(20)),
	dump_register(GRXFIFOSIZ(21)),
	dump_register(GRXFIFOSIZ(22)),
	dump_register(GRXFIFOSIZ(23)),
	dump_register(GRXFIFOSIZ(24)),
	dump_register(GRXFIFOSIZ(25)),
	dump_register(GRXFIFOSIZ(26)),
	dump_register(GRXFIFOSIZ(27)),
	dump_register(GRXFIFOSIZ(28)),
	dump_register(GRXFIFOSIZ(29)),
	dump_register(GRXFIFOSIZ(30)),
	dump_register(GRXFIFOSIZ(31)),

	dump_register(GEVNTADRLO(0)),
	dump_register(GEVNTADRHI(0)),
	dump_register(GEVNTSIZ(0)),
	dump_register(GEVNTCOUNT(0)),

	dump_register(GHWPARAMS8),
	dump_register(DCFG),
	dump_register(DCTL),
	dump_register(DEVTEN),
	dump_register(DSTS),
	dump_register(DGCMDPAR),
	dump_register(DGCMD),
	dump_register(DALEPENA),

	dump_ep_register_set(0),
	dump_ep_register_set(1),
	dump_ep_register_set(2),
	dump_ep_register_set(3),
	dump_ep_register_set(4),
	dump_ep_register_set(5),
	dump_ep_register_set(6),
	dump_ep_register_set(7),
	dump_ep_register_set(8),
	dump_ep_register_set(9),
	dump_ep_register_set(10),
	dump_ep_register_set(11),
	dump_ep_register_set(12),
	dump_ep_register_set(13),
	dump_ep_register_set(14),
	dump_ep_register_set(15),
	dump_ep_register_set(16),
	dump_ep_register_set(17),
	dump_ep_register_set(18),
	dump_ep_register_set(19),
	dump_ep_register_set(20),
	dump_ep_register_set(21),
	dump_ep_register_set(22),
	dump_ep_register_set(23),
	dump_ep_register_set(24),
	dump_ep_register_set(25),
	dump_ep_register_set(26),
	dump_ep_register_set(27),
	dump_ep_register_set(28),
	dump_ep_register_set(29),
	dump_ep_register_set(30),
	dump_ep_register_set(31),

	dump_register(OCFG),
	dump_register(OCTL),
	dump_register(OEVT),
	dump_register(OEVTEN),
	dump_register(OSTS),
	};

	static int dwc3_mode_show(struct seq_file s, void unused)
	{
	struct dwc3 *dwc = s->private;
	unsigned long flags;
	u32 reg;

	spin_lock_irqsave(&dwc->lock, flags);
	reg = dwc3_readl(dwc->regs, DWC3_GCTL);
	spin_unlock_irqrestore(&dwc->lock, flags);

	switch (DWC3_GCTL_PRTCAP(reg)) {
	case DWC3_GCTL_PRTCAP_HOST:
	seq_printf(s, "host\n");
	break;
	case DWC3_GCTL_PRTCAP_DEVICE:
	seq_printf(s, "device\n");
	break;
	case DWC3_GCTL_PRTCAP_OTG:
	seq_printf(s, "otg\n");
	break;
	default:
	seq_printf(s, "UNKNOWN %08x\n", DWC3_GCTL_PRTCAP(reg));
	}

	return 0;
	}

	static int dwc3_mode_open(struct inode inode, struct file file)
	{
	return single_open(file, dwc3_mode_show, inode->i_private);
	}

	static ssize_t dwc3_mode_write(struct file *file,
	const char __user ubuf, size_t count, loff_t ppos)
	{
	struct seq_file *s = file->private_data;
	struct dwc3 *dwc = s->private;
	u32 mode = 0;
	char buf[32];

	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
	return -EFAULT;

	if (!strncmp(buf, "host", 4))
	mode = DWC3_GCTL_PRTCAP_HOST;

	if (!strncmp(buf, "device", 6))
	mode = DWC3_GCTL_PRTCAP_DEVICE;

	if (!strncmp(buf, "otg", 3))
	mode = DWC3_GCTL_PRTCAP_OTG;

	dwc3_set_mode(dwc, mode);

	return count;
	}

	static const struct file_operations dwc3_mode_fops = {
	.open = dwc3_mode_open,
	.write = dwc3_mode_write,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	};

	static int dwc3_testmode_show(struct seq_file s, void unused)
	{
	struct dwc3 *dwc = s->private;
	unsigned long flags;
	u32 reg;

	spin_lock_irqsave(&dwc->lock, flags);
	reg = dwc3_readl(dwc->regs, DWC3_DCTL);
	reg &= DWC3_DCTL_TSTCTRL_MASK;
	reg >>= 1;
	spin_unlock_irqrestore(&dwc->lock, flags);

	switch (reg) {
	case 0:
	seq_printf(s, "no test\n");
	break;
	case TEST_J:
	seq_printf(s, "test_j\n");
	break;
	case TEST_K:
	seq_printf(s, "test_k\n");
	break;
	case TEST_SE0_NAK:
	seq_printf(s, "test_se0_nak\n");
	break;
	case TEST_PACKET:
	seq_printf(s, "test_packet\n");
	break;
	case TEST_FORCE_EN:
	seq_printf(s, "test_force_enable\n");
	break;
	default:
	seq_printf(s, "UNKNOWN %d\n", reg);
	}

	return 0;
	}

	static int dwc3_testmode_open(struct inode inode, struct file file)
	{
	return single_open(file, dwc3_testmode_show, inode->i_private);
	}

	static ssize_t dwc3_testmode_write(struct file *file,
	const char __user ubuf, size_t count, loff_t ppos)
	{
	struct seq_file *s = file->private_data;
	struct dwc3 *dwc = s->private;
	unsigned long flags;
	u32 testmode = 0;
	char buf[32];

	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
	return -EFAULT;

	if (!strncmp(buf, "test_j", 6))
	testmode = TEST_J;
	else if (!strncmp(buf, "test_k", 6))
	testmode = TEST_K;
	else if (!strncmp(buf, "test_se0_nak", 12))
	testmode = TEST_SE0_NAK;
	else if (!strncmp(buf, "test_packet", 11))
	testmode = TEST_PACKET;
	else if (!strncmp(buf, "test_force_enable", 17))
	testmode = TEST_FORCE_EN;
	else
	testmode = 0;

	spin_lock_irqsave(&dwc->lock, flags);
	dwc3_gadget_set_test_mode(dwc, testmode);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return count;
	}

	static const struct file_operations dwc3_testmode_fops = {
	.open = dwc3_testmode_open,
	.write = dwc3_testmode_write,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	};

	static int dwc3_link_state_show(struct seq_file s, void unused)
	{
	struct dwc3 *dwc = s->private;
	unsigned long flags;
	enum dwc3_link_state state;
	u32 reg;
	u8 speed;

	spin_lock_irqsave(&dwc->lock, flags);
	reg = dwc3_readl(dwc->regs, DWC3_DSTS);
	state = DWC3_DSTS_USBLNKST(reg);
	speed = reg & DWC3_DSTS_CONNECTSPD;

	seq_printf(s, "%s\n", (speed >= DWC3_DSTS_SUPERSPEED) ?
	dwc3_gadget_link_string(state) :
	dwc3_gadget_hs_link_string(state));
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
	}

	static int dwc3_link_state_open(struct inode inode, struct file file)
	{
	return single_open(file, dwc3_link_state_show, inode->i_private);
	}

	static ssize_t dwc3_link_state_write(struct file *file,
	const char __user ubuf, size_t count, loff_t ppos)
	{
	struct seq_file *s = file->private_data;
	struct dwc3 *dwc = s->private;
	unsigned long flags;
	enum dwc3_link_state state = 0;
	char buf[32];
	u32 reg;
	u8 speed;

	if (copy_from_user(&buf, ubuf, min_t(size_t, sizeof(buf) - 1, count)))
	return -EFAULT;

	if (!strncmp(buf, "SS.Disabled", 11))
	state = DWC3_LINK_STATE_SS_DIS;
	else if (!strncmp(buf, "Rx.Detect", 9))
	state = DWC3_LINK_STATE_RX_DET;
	else if (!strncmp(buf, "SS.Inactive", 11))
	state = DWC3_LINK_STATE_SS_INACT;
	else if (!strncmp(buf, "Recovery", 8))
	state = DWC3_LINK_STATE_RECOV;
	else if (!strncmp(buf, "Compliance", 10))
	state = DWC3_LINK_STATE_CMPLY;
	else if (!strncmp(buf, "Loopback", 8))
	state = DWC3_LINK_STATE_LPBK;
	else
	return -EINVAL;

	spin_lock_irqsave(&dwc->lock, flags);
	reg = dwc3_readl(dwc->regs, DWC3_DSTS);
	speed = reg & DWC3_DSTS_CONNECTSPD;

	if (speed < DWC3_DSTS_SUPERSPEED &&
	state != DWC3_LINK_STATE_RECOV) {
	spin_unlock_irqrestore(&dwc->lock, flags);
	return -EINVAL;
	}

	dwc3_gadget_set_link_state(dwc, state);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return count;
	}

	static const struct file_operations dwc3_link_state_fops = {
	.open = dwc3_link_state_open,
	.write = dwc3_link_state_write,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	};

	struct dwc3_ep_file_map {
	char name[25];
	int (show)(struct seq_file s, void *unused);
	};

	static int dwc3_tx_fifo_queue_show(struct seq_file s, void unused)
	{
	struct dwc3_ep *dep = s->private;
	struct dwc3 *dwc = dep->dwc;
	unsigned long flags;
	u32 val;

	spin_lock_irqsave(&dwc->lock, flags);
	val = dwc3_core_fifo_space(dep, DWC3_TXFIFOQ);
	seq_printf(s, "%u\n", val);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
	}

	static int dwc3_rx_fifo_queue_show(struct seq_file s, void unused)
	{
	struct dwc3_ep *dep = s->private;
	struct dwc3 *dwc = dep->dwc;
	unsigned long flags;
	u32 val;

	spin_lock_irqsave(&dwc->lock, flags);
	val = dwc3_core_fifo_space(dep, DWC3_RXFIFOQ);
	seq_printf(s, "%u\n", val);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
	}

	static int dwc3_tx_request_queue_show(struct seq_file s, void unused)
	{
	struct dwc3_ep *dep = s->private;
	struct dwc3 *dwc = dep->dwc;
	unsigned long flags;
	u32 val;

	spin_lock_irqsave(&dwc->lock, flags);
	val = dwc3_core_fifo_space(dep, DWC3_TXREQQ);
	seq_printf(s, "%u\n", val);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
	}

	static int dwc3_rx_request_queue_show(struct seq_file s, void unused)
	{
	struct dwc3_ep *dep = s->private;
	struct dwc3 *dwc = dep->dwc;
	unsigned long flags;
	u32 val;

	spin_lock_irqsave(&dwc->lock, flags);
	val = dwc3_core_fifo_space(dep, DWC3_RXREQQ);
	seq_printf(s, "%u\n", val);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
	}

	static int dwc3_rx_info_queue_show(struct seq_file s, void unused)
	{
	struct dwc3_ep *dep = s->private;
	struct dwc3 *dwc = dep->dwc;
	unsigned long flags;
	u32 val;

	spin_lock_irqsave(&dwc->lock, flags);
	val = dwc3_core_fifo_space(dep, DWC3_RXINFOQ);
	seq_printf(s, "%u\n", val);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
	}

	static int dwc3_descriptor_fetch_queue_show(struct seq_file s, void unused)
	{
	struct dwc3_ep *dep = s->private;
	struct dwc3 *dwc = dep->dwc;
	unsigned long flags;
	u32 val;

	spin_lock_irqsave(&dwc->lock, flags);
	val = dwc3_core_fifo_space(dep, DWC3_DESCFETCHQ);
	seq_printf(s, "%u\n", val);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
	}

	static int dwc3_event_queue_show(struct seq_file s, void unused)
	{
	struct dwc3_ep *dep = s->private;
	struct dwc3 *dwc = dep->dwc;
	unsigned long flags;
	u32 val;

	spin_lock_irqsave(&dwc->lock, flags);
	val = dwc3_core_fifo_space(dep, DWC3_EVENTQ);
	seq_printf(s, "%u\n", val);
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
	}

	static int dwc3_ep_transfer_type_show(struct seq_file s, void unused)
	{
	struct dwc3_ep *dep = s->private;
	struct dwc3 *dwc = dep->dwc;
	unsigned long flags;

	spin_lock_irqsave(&dwc->lock, flags);
	if (!(dep->flags & DWC3_EP_ENABLED) \|\|
	!dep->endpoint.desc) {
	seq_printf(s, "--\n");
	goto out;
	}

	switch (usb_endpoint_type(dep->endpoint.desc)) {
	case USB_ENDPOINT_XFER_CONTROL:
	seq_printf(s, "control\n");
	break;
	case USB_ENDPOINT_XFER_ISOC:
	seq_printf(s, "isochronous\n");
	break;
	case USB_ENDPOINT_XFER_BULK:
	seq_printf(s, "bulk\n");
	break;
	case USB_ENDPOINT_XFER_INT:
	seq_printf(s, "interrupt\n");
	break;
	default:
	seq_printf(s, "--\n");
	}

	out:
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
	}

	static int dwc3_ep_trb_ring_show(struct seq_file s, void unused)
	{
	struct dwc3_ep *dep = s->private;
	struct dwc3 *dwc = dep->dwc;
	unsigned long flags;
	int i;

	spin_lock_irqsave(&dwc->lock, flags);
	if (dep->number <= 1) {
	seq_printf(s, "--\n");
	goto out;
	}

	seq_printf(s, "buffer_addr,size,type,ioc,isp_imi,csp,chn,lst,hwo\n");

	for (i = 0; i < DWC3_TRB_NUM; i++) {
	struct dwc3_trb *trb = &dep->trb_pool[i];
	unsigned int type = DWC3_TRBCTL_TYPE(trb->ctrl);

	seq_printf(s, "%08x%08x,%d,%s,%d,%d,%d,%d,%d,%d %c%c\n",
	trb->bph, trb->bpl, trb->size,
	dwc3_trb_type_string(type),
	!!(trb->ctrl & DWC3_TRB_CTRL_IOC),
	!!(trb->ctrl & DWC3_TRB_CTRL_ISP_IMI),
	!!(trb->ctrl & DWC3_TRB_CTRL_CSP),
	!!(trb->ctrl & DWC3_TRB_CTRL_CHN),
	!!(trb->ctrl & DWC3_TRB_CTRL_LST),
	!!(trb->ctrl & DWC3_TRB_CTRL_HWO),
	dep->trb_enqueue == i ? 'E' : ' ',
	dep->trb_dequeue == i ? 'D' : ' ');
	}

	out:
	spin_unlock_irqrestore(&dwc->lock, flags);

	return 0;
	}

	static struct dwc3_ep_file_map map[] = {
	{ "tx_fifo_queue", dwc3_tx_fifo_queue_show, },
	{ "rx_fifo_queue", dwc3_rx_fifo_queue_show, },
	{ "tx_request_queue", dwc3_tx_request_queue_show, },
	{ "rx_request_queue", dwc3_rx_request_queue_show, },
	{ "rx_info_queue", dwc3_rx_info_queue_show, },
	{ "descriptor_fetch_queue", dwc3_descriptor_fetch_queue_show, },
	{ "event_queue", dwc3_event_queue_show, },
	{ "transfer_type", dwc3_ep_transfer_type_show, },
	{ "trb_ring", dwc3_ep_trb_ring_show, },
	};

	static int dwc3_endpoint_open(struct inode inode, struct file file)
	{
	const char *file_name = file_dentry(file)->d_iname;
	struct dwc3_ep_file_map *f_map;
	int i;

	for (i = 0; i < ARRAY_SIZE(map); i++) {
	f_map = &map[i];

	if (strcmp(f_map->name, file_name) == 0)
	break;
	}

	return single_open(file, f_map->show, inode->i_private);
	}

	static const struct file_operations dwc3_endpoint_fops = {
	.open = dwc3_endpoint_open,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	};

	static void dwc3_debugfs_create_endpoint_file(struct dwc3_ep *dep,
	struct dentry *parent, int type)
	{
	struct dentry *file;
	struct dwc3_ep_file_map *ep_file = &map[type];

	file = debugfs_create_file(ep_file->name, S_IRUGO, parent, dep,
	&dwc3_endpoint_fops);
	}

	static void dwc3_debugfs_create_endpoint_files(struct dwc3_ep *dep,
	struct dentry *parent)
	{
	int i;

	for (i = 0; i < ARRAY_SIZE(map); i++)
	dwc3_debugfs_create_endpoint_file(dep, parent, i);
	}

	static void dwc3_debugfs_create_endpoint_dir(struct dwc3_ep *dep,
	struct dentry *parent)
	{
	struct dentry *dir;

	dir = debugfs_create_dir(dep->name, parent);
	if (IS_ERR_OR_NULL(dir))
	return;

	dwc3_debugfs_create_endpoint_files(dep, dir);
	}

	static void dwc3_debugfs_create_endpoint_dirs(struct dwc3 *dwc,
	struct dentry *parent)
	{
	int i;

	for (i = 0; i < dwc->num_eps; i++) {
	struct dwc3_ep *dep = dwc->eps[i];

	if (!dep)
	continue;

	dwc3_debugfs_create_endpoint_dir(dep, parent);
	}
	}

	void dwc3_debugfs_init(struct dwc3 *dwc)
	{
	struct dentry *root;
	struct dentry *file;

	root = debugfs_create_dir(dev_name(dwc->dev), NULL);
	if (IS_ERR_OR_NULL(root)) {
	if (!root)
	dev_err(dwc->dev, "Can't create debugfs root\n");
	return;
	}
	dwc->root = root;

	dwc->regset = kzalloc(sizeof(*dwc->regset), GFP_KERNEL);
	if (!dwc->regset) {
	debugfs_remove_recursive(root);
	return;
	}

	dwc->regset->regs = dwc3_regs;
	dwc->regset->nregs = ARRAY_SIZE(dwc3_regs);
	dwc->regset->base = dwc->regs - DWC3_GLOBALS_REGS_START;

	file = debugfs_create_regset32("regdump", S_IRUGO, root, dwc->regset);
	if (!file)
	dev_dbg(dwc->dev, "Can't create debugfs regdump\n");

	if (IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE)) {
	file = debugfs_create_file("mode", S_IRUGO \| S_IWUSR, root,
	dwc, &dwc3_mode_fops);
	if (!file)
	dev_dbg(dwc->dev, "Can't create debugfs mode\n");
	}

	if (IS_ENABLED(CONFIG_USB_DWC3_DUAL_ROLE) \|\|
	IS_ENABLED(CONFIG_USB_DWC3_GADGET)) {
	file = debugfs_create_file("testmode", S_IRUGO \| S_IWUSR, root,
	dwc, &dwc3_testmode_fops);
	if (!file)
	dev_dbg(dwc->dev, "Can't create debugfs testmode\n");

	file = debugfs_create_file("link_state", S_IRUGO \| S_IWUSR,
	root, dwc, &dwc3_link_state_fops);
	if (!file)
	dev_dbg(dwc->dev, "Can't create debugfs link_state\n");

	dwc3_debugfs_create_endpoint_dirs(dwc, root);
	}
	}

	void dwc3_debugfs_exit(struct dwc3 *dwc)
	{
	debugfs_remove_recursive(dwc->root);
	kfree(dwc->regset);
	}