drivers/usb/musb/musb_debugfs.c - third_party/linux - Git at Google

 /*
  * MUSB OTG driver debugfs support
  *
  * Copyright 2010 Nokia Corporation
  * Contact: Felipe Balbi <felipe.balbi@nokia.com>
  *
  * 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 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.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
  * 02110-1301 USA
  *
  * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN
  * NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
  * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  *
  */

 #include <linux/module.h>
 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/debugfs.h>
 #include <linux/seq_file.h>

 #include <linux/uaccess.h>

 #include "musb_core.h"
 #include "musb_debug.h"

 struct musb_register_map {
 	char			*name;
 	unsigned		offset;
 	unsigned		size;
 };

 static const struct musb_register_map musb_regmap[] = {
 	{ "FAddr",	MUSB_FADDR,	8 },
 	{ "Power",	MUSB_POWER,	8 },
 	{ "Frame",	MUSB_FRAME,	16 },
 	{ "Index",	MUSB_INDEX,	8 },
 	{ "Testmode",	MUSB_TESTMODE,	8 },
 	{ "TxMaxPp",	MUSB_TXMAXP,	16 },
 	{ "TxCSRp",	MUSB_TXCSR,	16 },
 	{ "RxMaxPp",	MUSB_RXMAXP,	16 },
 	{ "RxCSR",	MUSB_RXCSR,	16 },
 	{ "RxCount",	MUSB_RXCOUNT,	16 },
 	{ "IntrRxE",	MUSB_INTRRXE,	16 },
 	{ "IntrTxE",	MUSB_INTRTXE,	16 },
 	{ "IntrUsbE",	MUSB_INTRUSBE,	8 },
 	{ "DevCtl",	MUSB_DEVCTL,	8 },
 	{ "VControl",	0x68,		32 },
 	{ "HWVers",	0x69,		16 },
 	{ "LinkInfo",	MUSB_LINKINFO,	8 },
 	{ "VPLen",	MUSB_VPLEN,	8 },
 	{ "HS_EOF1",	MUSB_HS_EOF1,	8 },
 	{ "FS_EOF1",	MUSB_FS_EOF1,	8 },
 	{ "LS_EOF1",	MUSB_LS_EOF1,	8 },
 	{ "SOFT_RST",	0x7F,		8 },
 	{ "DMA_CNTLch0",	0x204,	16 },
 	{ "DMA_ADDRch0",	0x208,	32 },
 	{ "DMA_COUNTch0",	0x20C,	32 },
 	{ "DMA_CNTLch1",	0x214,	16 },
 	{ "DMA_ADDRch1",	0x218,	32 },
 	{ "DMA_COUNTch1",	0x21C,	32 },
 	{ "DMA_CNTLch2",	0x224,	16 },
 	{ "DMA_ADDRch2",	0x228,	32 },
 	{ "DMA_COUNTch2",	0x22C,	32 },
 	{ "DMA_CNTLch3",	0x234,	16 },
 	{ "DMA_ADDRch3",	0x238,	32 },
 	{ "DMA_COUNTch3",	0x23C,	32 },
 	{ "DMA_CNTLch4",	0x244,	16 },
 	{ "DMA_ADDRch4",	0x248,	32 },
 	{ "DMA_COUNTch4",	0x24C,	32 },
 	{ "DMA_CNTLch5",	0x254,	16 },
 	{ "DMA_ADDRch5",	0x258,	32 },
 	{ "DMA_COUNTch5",	0x25C,	32 },
 	{ "DMA_CNTLch6",	0x264,	16 },
 	{ "DMA_ADDRch6",	0x268,	32 },
 	{ "DMA_COUNTch6",	0x26C,	32 },
 	{ "DMA_CNTLch7",	0x274,	16 },
 	{ "DMA_ADDRch7",	0x278,	32 },
 	{ "DMA_COUNTch7",	0x27C,	32 },
 #ifndef CONFIG_BLACKFIN
 	{ "ConfigData",	MUSB_CONFIGDATA,8 },
 	{ "BabbleCtl",	MUSB_BABBLE_CTL,8 },
 	{ "TxFIFOsz",	MUSB_TXFIFOSZ,	8 },
 	{ "RxFIFOsz",	MUSB_RXFIFOSZ,	8 },
 	{ "TxFIFOadd",	MUSB_TXFIFOADD,	16 },
 	{ "RxFIFOadd",	MUSB_RXFIFOADD,	16 },
 	{ "EPInfo",	MUSB_EPINFO,	8 },
 	{ "RAMInfo",	MUSB_RAMINFO,	8 },
 #endif
 	{  }	/* Terminating Entry */
 };

 static int musb_regdump_show(struct seq_file *s, void *unused)
 {
 	struct musb		*musb = s->private;
 	unsigned		i;

 	seq_printf(s, "MUSB (M)HDRC Register Dump\n");
 	pm_runtime_get_sync(musb->controller);

 	for (i = 0; i < ARRAY_SIZE(musb_regmap); i++) {
 		switch (musb_regmap[i].size) {
 		case 8:
 			seq_printf(s, "%-12s: %02x\n", musb_regmap[i].name,
 					musb_readb(musb->mregs, musb_regmap[i].offset));
 			break;
 		case 16:
 			seq_printf(s, "%-12s: %04x\n", musb_regmap[i].name,
 					musb_readw(musb->mregs, musb_regmap[i].offset));
 			break;
 		case 32:
 			seq_printf(s, "%-12s: %08x\n", musb_regmap[i].name,
 					musb_readl(musb->mregs, musb_regmap[i].offset));
 			break;
 		}
 	}

 	pm_runtime_mark_last_busy(musb->controller);
 	pm_runtime_put_autosuspend(musb->controller);
 	return 0;
 }

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

 static int musb_test_mode_show(struct seq_file *s, void *unused)
 {
 	struct musb		*musb = s->private;
 	unsigned		test;

 	pm_runtime_get_sync(musb->controller);
 	test = musb_readb(musb->mregs, MUSB_TESTMODE);
 	pm_runtime_mark_last_busy(musb->controller);
 	pm_runtime_put_autosuspend(musb->controller);

 	if (test == (MUSB_TEST_FORCE_HOST | MUSB_TEST_FORCE_FS))
 		seq_printf(s, "force host full-speed\n");

 	else if (test == (MUSB_TEST_FORCE_HOST | MUSB_TEST_FORCE_HS))
 		seq_printf(s, "force host high-speed\n");

 	else if (test == MUSB_TEST_FORCE_HOST)
 		seq_printf(s, "force host\n");

 	else if (test == MUSB_TEST_FIFO_ACCESS)
 		seq_printf(s, "fifo access\n");

 	else if (test == MUSB_TEST_FORCE_FS)
 		seq_printf(s, "force full-speed\n");

 	else if (test == MUSB_TEST_FORCE_HS)
 		seq_printf(s, "force high-speed\n");

 	else if (test == MUSB_TEST_PACKET)
 		seq_printf(s, "test packet\n");

 	else if (test == MUSB_TEST_K)
 		seq_printf(s, "test K\n");

 	else if (test == MUSB_TEST_J)
 		seq_printf(s, "test J\n");

 	else if (test == MUSB_TEST_SE0_NAK)
 		seq_printf(s, "test SE0 NAK\n");

 	return 0;
 }

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

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

 static ssize_t musb_test_mode_write(struct file *file,
 		const char __user *ubuf, size_t count, loff_t *ppos)
 {
 	struct seq_file		*s = file->private_data;
 	struct musb		*musb = s->private;
 	u8			test;
 	char			buf[24];

 	memset(buf, 0x00, sizeof(buf));

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

 	pm_runtime_get_sync(musb->controller);
 	test = musb_readb(musb->mregs, MUSB_TESTMODE);
 	if (test) {
 		dev_err(musb->controller, "Error: test mode is already set. "
 			"Please do USB Bus Reset to start a new test.\n");
 		goto ret;
 	}

 	if (strstarts(buf, "force host full-speed"))
 		test = MUSB_TEST_FORCE_HOST | MUSB_TEST_FORCE_FS;

 	else if (strstarts(buf, "force host high-speed"))
 		test = MUSB_TEST_FORCE_HOST | MUSB_TEST_FORCE_HS;

 	else if (strstarts(buf, "force host"))
 		test = MUSB_TEST_FORCE_HOST;

 	else if (strstarts(buf, "fifo access"))
 		test = MUSB_TEST_FIFO_ACCESS;

 	else if (strstarts(buf, "force full-speed"))
 		test = MUSB_TEST_FORCE_FS;

 	else if (strstarts(buf, "force high-speed"))
 		test = MUSB_TEST_FORCE_HS;

 	else if (strstarts(buf, "test packet")) {
 		test = MUSB_TEST_PACKET;
 		musb_load_testpacket(musb);
 	}

 	else if (strstarts(buf, "test K"))
 		test = MUSB_TEST_K;

 	else if (strstarts(buf, "test J"))
 		test = MUSB_TEST_J;

 	else if (strstarts(buf, "test SE0 NAK"))
 		test = MUSB_TEST_SE0_NAK;

 	musb_writeb(musb->mregs, MUSB_TESTMODE, test);

 ret:
 	pm_runtime_mark_last_busy(musb->controller);
 	pm_runtime_put_autosuspend(musb->controller);
 	return count;
 }

 static const struct file_operations musb_test_mode_fops = {
 	.open			= musb_test_mode_open,
 	.write			= musb_test_mode_write,
 	.read			= seq_read,
 	.llseek			= seq_lseek,
 	.release		= single_release,
 };

 static int musb_softconnect_show(struct seq_file *s, void *unused)
 {
 	struct musb	*musb = s->private;
 	u8		reg;
 	int		connect;

 	switch (musb->xceiv->otg->state) {
 	case OTG_STATE_A_HOST:
 	case OTG_STATE_A_WAIT_BCON:
 		pm_runtime_get_sync(musb->controller);

 		reg = musb_readb(musb->mregs, MUSB_DEVCTL);
 		connect = reg & MUSB_DEVCTL_SESSION ? 1 : 0;

 		pm_runtime_mark_last_busy(musb->controller);
 		pm_runtime_put_autosuspend(musb->controller);
 		break;
 	default:
 		connect = -1;
 	}

 	seq_printf(s, "%d\n", connect);

 	return 0;
 }

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

 static ssize_t musb_softconnect_write(struct file *file,
 		const char __user *ubuf, size_t count, loff_t *ppos)
 {
 	struct seq_file		*s = file->private_data;
 	struct musb		*musb = s->private;
 	char			buf[2];
 	u8			reg;

 	memset(buf, 0x00, sizeof(buf));

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

 	pm_runtime_get_sync(musb->controller);
 	if (!strncmp(buf, "0", 1)) {
 		switch (musb->xceiv->otg->state) {
 		case OTG_STATE_A_HOST:
 			musb_root_disconnect(musb);
 			reg = musb_readb(musb->mregs, MUSB_DEVCTL);
 			reg &= ~MUSB_DEVCTL_SESSION;
 			musb_writeb(musb->mregs, MUSB_DEVCTL, reg);
 			break;
 		default:
 			break;
 		}
 	} else if (!strncmp(buf, "1", 1)) {
 		switch (musb->xceiv->otg->state) {
 		case OTG_STATE_A_WAIT_BCON:
 			/*
 			 * musb_save_context() called in musb_runtime_suspend()
 			 * might cache devctl with SESSION bit cleared during
 			 * soft-disconnect, so specifically set SESSION bit
 			 * here to preserve it for musb_runtime_resume().
 			 */
 			musb->context.devctl |= MUSB_DEVCTL_SESSION;
 			reg = musb_readb(musb->mregs, MUSB_DEVCTL);
 			reg |= MUSB_DEVCTL_SESSION;
 			musb_writeb(musb->mregs, MUSB_DEVCTL, reg);
 			break;
 		default:
 			break;
 		}
 	}

 	pm_runtime_mark_last_busy(musb->controller);
 	pm_runtime_put_autosuspend(musb->controller);
 	return count;
 }

 /*
  * In host mode, connect/disconnect the bus without physically
  * remove the devices.
  */
 static const struct file_operations musb_softconnect_fops = {
 	.open			= musb_softconnect_open,
 	.write			= musb_softconnect_write,
 	.read			= seq_read,
 	.llseek			= seq_lseek,
 	.release		= single_release,
 };

 int musb_init_debugfs(struct musb *musb)
 {
 	struct dentry		*root;
 	struct dentry		*file;
 	int			ret;

 	root = debugfs_create_dir(dev_name(musb->controller), NULL);
 	if (!root) {
 		ret = -ENOMEM;
 		goto err0;
 	}

 	file = debugfs_create_file("regdump", S_IRUGO, root, musb,
 			&musb_regdump_fops);
 	if (!file) {
 		ret = -ENOMEM;
 		goto err1;
 	}

 	file = debugfs_create_file("testmode", S_IRUGO | S_IWUSR,
 			root, musb, &musb_test_mode_fops);
 	if (!file) {
 		ret = -ENOMEM;
 		goto err1;
 	}

 	file = debugfs_create_file("softconnect", S_IRUGO | S_IWUSR,
 			root, musb, &musb_softconnect_fops);
 	if (!file) {
 		ret = -ENOMEM;
 		goto err1;
 	}

 	musb->debugfs_root = root;

 	return 0;

 err1:
 	debugfs_remove_recursive(root);

 err0:
 	return ret;
 }

 void /* __init_or_exit */ musb_exit_debugfs(struct musb *musb)
 {
 	debugfs_remove_recursive(musb->debugfs_root);
 }
	/*
	* MUSB OTG driver debugfs support
	*
	* Copyright 2010 Nokia Corporation
	* Contact: Felipe Balbi <felipe.balbi@nokia.com>
	*
	* 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 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.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
	* 02110-1301 USA
	*
	* THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESS OR IMPLIED
	* WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
	* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN
	* NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
	* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
	* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
	* USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
	* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*
	*/

	#include <linux/module.h>
	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/debugfs.h>
	#include <linux/seq_file.h>

	#include <linux/uaccess.h>

	#include "musb_core.h"
	#include "musb_debug.h"

	struct musb_register_map {
	char *name;
	unsigned offset;
	unsigned size;
	};

	static const struct musb_register_map musb_regmap[] = {
	{ "FAddr", MUSB_FADDR, 8 },
	{ "Power", MUSB_POWER, 8 },
	{ "Frame", MUSB_FRAME, 16 },
	{ "Index", MUSB_INDEX, 8 },
	{ "Testmode", MUSB_TESTMODE, 8 },
	{ "TxMaxPp", MUSB_TXMAXP, 16 },
	{ "TxCSRp", MUSB_TXCSR, 16 },
	{ "RxMaxPp", MUSB_RXMAXP, 16 },
	{ "RxCSR", MUSB_RXCSR, 16 },
	{ "RxCount", MUSB_RXCOUNT, 16 },
	{ "IntrRxE", MUSB_INTRRXE, 16 },
	{ "IntrTxE", MUSB_INTRTXE, 16 },
	{ "IntrUsbE", MUSB_INTRUSBE, 8 },
	{ "DevCtl", MUSB_DEVCTL, 8 },
	{ "VControl", 0x68, 32 },
	{ "HWVers", 0x69, 16 },
	{ "LinkInfo", MUSB_LINKINFO, 8 },
	{ "VPLen", MUSB_VPLEN, 8 },
	{ "HS_EOF1", MUSB_HS_EOF1, 8 },
	{ "FS_EOF1", MUSB_FS_EOF1, 8 },
	{ "LS_EOF1", MUSB_LS_EOF1, 8 },
	{ "SOFT_RST", 0x7F, 8 },
	{ "DMA_CNTLch0", 0x204, 16 },
	{ "DMA_ADDRch0", 0x208, 32 },
	{ "DMA_COUNTch0", 0x20C, 32 },
	{ "DMA_CNTLch1", 0x214, 16 },
	{ "DMA_ADDRch1", 0x218, 32 },
	{ "DMA_COUNTch1", 0x21C, 32 },
	{ "DMA_CNTLch2", 0x224, 16 },
	{ "DMA_ADDRch2", 0x228, 32 },
	{ "DMA_COUNTch2", 0x22C, 32 },
	{ "DMA_CNTLch3", 0x234, 16 },
	{ "DMA_ADDRch3", 0x238, 32 },
	{ "DMA_COUNTch3", 0x23C, 32 },
	{ "DMA_CNTLch4", 0x244, 16 },
	{ "DMA_ADDRch4", 0x248, 32 },
	{ "DMA_COUNTch4", 0x24C, 32 },
	{ "DMA_CNTLch5", 0x254, 16 },
	{ "DMA_ADDRch5", 0x258, 32 },
	{ "DMA_COUNTch5", 0x25C, 32 },
	{ "DMA_CNTLch6", 0x264, 16 },
	{ "DMA_ADDRch6", 0x268, 32 },
	{ "DMA_COUNTch6", 0x26C, 32 },
	{ "DMA_CNTLch7", 0x274, 16 },
	{ "DMA_ADDRch7", 0x278, 32 },
	{ "DMA_COUNTch7", 0x27C, 32 },
	#ifndef CONFIG_BLACKFIN
	{ "ConfigData", MUSB_CONFIGDATA,8 },
	{ "BabbleCtl", MUSB_BABBLE_CTL,8 },
	{ "TxFIFOsz", MUSB_TXFIFOSZ, 8 },
	{ "RxFIFOsz", MUSB_RXFIFOSZ, 8 },
	{ "TxFIFOadd", MUSB_TXFIFOADD, 16 },
	{ "RxFIFOadd", MUSB_RXFIFOADD, 16 },
	{ "EPInfo", MUSB_EPINFO, 8 },
	{ "RAMInfo", MUSB_RAMINFO, 8 },
	#endif
	{ } /* Terminating Entry */
	};

	static int musb_regdump_show(struct seq_file s, void unused)
	{
	struct musb *musb = s->private;
	unsigned i;

	seq_printf(s, "MUSB (M)HDRC Register Dump\n");
	pm_runtime_get_sync(musb->controller);

	for (i = 0; i < ARRAY_SIZE(musb_regmap); i++) {
	switch (musb_regmap[i].size) {
	case 8:
	seq_printf(s, "%-12s: %02x\n", musb_regmap[i].name,
	musb_readb(musb->mregs, musb_regmap[i].offset));
	break;
	case 16:
	seq_printf(s, "%-12s: %04x\n", musb_regmap[i].name,
	musb_readw(musb->mregs, musb_regmap[i].offset));
	break;
	case 32:
	seq_printf(s, "%-12s: %08x\n", musb_regmap[i].name,
	musb_readl(musb->mregs, musb_regmap[i].offset));
	break;
	}
	}

	pm_runtime_mark_last_busy(musb->controller);
	pm_runtime_put_autosuspend(musb->controller);
	return 0;
	}

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

	static int musb_test_mode_show(struct seq_file s, void unused)
	{
	struct musb *musb = s->private;
	unsigned test;

	pm_runtime_get_sync(musb->controller);
	test = musb_readb(musb->mregs, MUSB_TESTMODE);
	pm_runtime_mark_last_busy(musb->controller);
	pm_runtime_put_autosuspend(musb->controller);

	if (test == (MUSB_TEST_FORCE_HOST \| MUSB_TEST_FORCE_FS))
	seq_printf(s, "force host full-speed\n");

	else if (test == (MUSB_TEST_FORCE_HOST \| MUSB_TEST_FORCE_HS))
	seq_printf(s, "force host high-speed\n");

	else if (test == MUSB_TEST_FORCE_HOST)
	seq_printf(s, "force host\n");

	else if (test == MUSB_TEST_FIFO_ACCESS)
	seq_printf(s, "fifo access\n");

	else if (test == MUSB_TEST_FORCE_FS)
	seq_printf(s, "force full-speed\n");

	else if (test == MUSB_TEST_FORCE_HS)
	seq_printf(s, "force high-speed\n");

	else if (test == MUSB_TEST_PACKET)
	seq_printf(s, "test packet\n");

	else if (test == MUSB_TEST_K)
	seq_printf(s, "test K\n");

	else if (test == MUSB_TEST_J)
	seq_printf(s, "test J\n");

	else if (test == MUSB_TEST_SE0_NAK)
	seq_printf(s, "test SE0 NAK\n");

	return 0;
	}

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

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

	static ssize_t musb_test_mode_write(struct file *file,
	const char __user ubuf, size_t count, loff_t ppos)
	{
	struct seq_file *s = file->private_data;
	struct musb *musb = s->private;
	u8 test;
	char buf[24];

	memset(buf, 0x00, sizeof(buf));

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

	pm_runtime_get_sync(musb->controller);
	test = musb_readb(musb->mregs, MUSB_TESTMODE);
	if (test) {
	dev_err(musb->controller, "Error: test mode is already set. "
	"Please do USB Bus Reset to start a new test.\n");
	goto ret;
	}

	if (strstarts(buf, "force host full-speed"))
	test = MUSB_TEST_FORCE_HOST \| MUSB_TEST_FORCE_FS;

	else if (strstarts(buf, "force host high-speed"))
	test = MUSB_TEST_FORCE_HOST \| MUSB_TEST_FORCE_HS;

	else if (strstarts(buf, "force host"))
	test = MUSB_TEST_FORCE_HOST;

	else if (strstarts(buf, "fifo access"))
	test = MUSB_TEST_FIFO_ACCESS;

	else if (strstarts(buf, "force full-speed"))
	test = MUSB_TEST_FORCE_FS;

	else if (strstarts(buf, "force high-speed"))
	test = MUSB_TEST_FORCE_HS;

	else if (strstarts(buf, "test packet")) {
	test = MUSB_TEST_PACKET;
	musb_load_testpacket(musb);
	}

	else if (strstarts(buf, "test K"))
	test = MUSB_TEST_K;

	else if (strstarts(buf, "test J"))
	test = MUSB_TEST_J;

	else if (strstarts(buf, "test SE0 NAK"))
	test = MUSB_TEST_SE0_NAK;

	musb_writeb(musb->mregs, MUSB_TESTMODE, test);

	ret:
	pm_runtime_mark_last_busy(musb->controller);
	pm_runtime_put_autosuspend(musb->controller);
	return count;
	}

	static const struct file_operations musb_test_mode_fops = {
	.open = musb_test_mode_open,
	.write = musb_test_mode_write,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	};

	static int musb_softconnect_show(struct seq_file s, void unused)
	{
	struct musb *musb = s->private;
	u8 reg;
	int connect;

	switch (musb->xceiv->otg->state) {
	case OTG_STATE_A_HOST:
	case OTG_STATE_A_WAIT_BCON:
	pm_runtime_get_sync(musb->controller);

	reg = musb_readb(musb->mregs, MUSB_DEVCTL);
	connect = reg & MUSB_DEVCTL_SESSION ? 1 : 0;

	pm_runtime_mark_last_busy(musb->controller);
	pm_runtime_put_autosuspend(musb->controller);
	break;
	default:
	connect = -1;
	}

	seq_printf(s, "%d\n", connect);

	return 0;
	}

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

	static ssize_t musb_softconnect_write(struct file *file,
	const char __user ubuf, size_t count, loff_t ppos)
	{
	struct seq_file *s = file->private_data;
	struct musb *musb = s->private;
	char buf[2];
	u8 reg;

	memset(buf, 0x00, sizeof(buf));

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

	pm_runtime_get_sync(musb->controller);
	if (!strncmp(buf, "0", 1)) {
	switch (musb->xceiv->otg->state) {
	case OTG_STATE_A_HOST:
	musb_root_disconnect(musb);
	reg = musb_readb(musb->mregs, MUSB_DEVCTL);
	reg &= ~MUSB_DEVCTL_SESSION;
	musb_writeb(musb->mregs, MUSB_DEVCTL, reg);
	break;
	default:
	break;
	}
	} else if (!strncmp(buf, "1", 1)) {
	switch (musb->xceiv->otg->state) {
	case OTG_STATE_A_WAIT_BCON:
	/*
	* musb_save_context() called in musb_runtime_suspend()
	* might cache devctl with SESSION bit cleared during
	* soft-disconnect, so specifically set SESSION bit
	* here to preserve it for musb_runtime_resume().
	*/
	musb->context.devctl \|= MUSB_DEVCTL_SESSION;
	reg = musb_readb(musb->mregs, MUSB_DEVCTL);
	reg \|= MUSB_DEVCTL_SESSION;
	musb_writeb(musb->mregs, MUSB_DEVCTL, reg);
	break;
	default:
	break;
	}
	}

	pm_runtime_mark_last_busy(musb->controller);
	pm_runtime_put_autosuspend(musb->controller);
	return count;
	}

	/*
	* In host mode, connect/disconnect the bus without physically
	* remove the devices.
	*/
	static const struct file_operations musb_softconnect_fops = {
	.open = musb_softconnect_open,
	.write = musb_softconnect_write,
	.read = seq_read,
	.llseek = seq_lseek,
	.release = single_release,
	};

	int musb_init_debugfs(struct musb *musb)
	{
	struct dentry *root;
	struct dentry *file;
	int ret;

	root = debugfs_create_dir(dev_name(musb->controller), NULL);
	if (!root) {
	ret = -ENOMEM;
	goto err0;
	}

	file = debugfs_create_file("regdump", S_IRUGO, root, musb,
	&musb_regdump_fops);
	if (!file) {
	ret = -ENOMEM;
	goto err1;
	}

	file = debugfs_create_file("testmode", S_IRUGO \| S_IWUSR,
	root, musb, &musb_test_mode_fops);
	if (!file) {
	ret = -ENOMEM;
	goto err1;
	}

	file = debugfs_create_file("softconnect", S_IRUGO \| S_IWUSR,
	root, musb, &musb_softconnect_fops);
	if (!file) {
	ret = -ENOMEM;
	goto err1;
	}

	musb->debugfs_root = root;

	return 0;

	err1:
	debugfs_remove_recursive(root);

	err0:
	return ret;
	}

	void /* __init_or_exit / musb_exit_debugfs(struct musb musb)
	{
	debugfs_remove_recursive(musb->debugfs_root);
	}