[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / mmc / core / debugfs.c

/*
 * Debugfs support for hosts and cards
 *
 * Copyright (C) 2008 Atmel Corporation
 *
 * 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.
 */
#include <linux/moduleparam.h>
#include <linux/export.h>
#include <linux/debugfs.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/stat.h>
#include <linux/fault-inject.h>

#include <linux/mmc/card.h>
#include <linux/mmc/host.h>

#include "core.h"
#include "mmc_ops.h"

#ifdef CONFIG_FAIL_MMC_REQUEST

static DECLARE_FAULT_ATTR(fail_default_attr);
static char *fail_request;
module_param(fail_request, charp, 0);

#endif /* CONFIG_FAIL_MMC_REQUEST */

/* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
static int mmc_ios_show(struct seq_file *s, void *data)
{
	static const char *vdd_str[] = {
		[8]	= "2.0",
		[9]	= "2.1",
		[10]	= "2.2",
		[11]	= "2.3",
		[12]	= "2.4",
		[13]	= "2.5",
		[14]	= "2.6",
		[15]	= "2.7",
		[16]	= "2.8",
		[17]	= "2.9",
		[18]	= "3.0",
		[19]	= "3.1",
		[20]	= "3.2",
		[21]	= "3.3",
		[22]	= "3.4",
		[23]	= "3.5",
		[24]	= "3.6",
	};
	struct mmc_host	*host = s->private;
	struct mmc_ios	*ios = &host->ios;
	const char *str;

	seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
	if (host->actual_clock)
		seq_printf(s, "actual clock:\t%u Hz\n", host->actual_clock);
	seq_printf(s, "vdd:\t\t%u ", ios->vdd);
	if ((1 << ios->vdd) & MMC_VDD_165_195)
		seq_printf(s, "(1.65 - 1.95 V)\n");
	else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
			&& vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
		seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
				vdd_str[ios->vdd + 1]);
	else
		seq_printf(s, "(invalid)\n");

	switch (ios->bus_mode) {
	case MMC_BUSMODE_OPENDRAIN:
		str = "open drain";
		break;
	case MMC_BUSMODE_PUSHPULL:
		str = "push-pull";
		break;
	default:
		str = "invalid";
		break;
	}
	seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);

	switch (ios->chip_select) {
	case MMC_CS_DONTCARE:
		str = "don't care";
		break;
	case MMC_CS_HIGH:
		str = "active high";
		break;
	case MMC_CS_LOW:
		str = "active low";
		break;
	default:
		str = "invalid";
		break;
	}
	seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);

	switch (ios->power_mode) {
	case MMC_POWER_OFF:
		str = "off";
		break;
	case MMC_POWER_UP:
		str = "up";
		break;
	case MMC_POWER_ON:
		str = "on";
		break;
	default:
		str = "invalid";
		break;
	}
	seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
	seq_printf(s, "bus width:\t%u (%u bits)\n",
			ios->bus_width, 1 << ios->bus_width);

	switch (ios->timing) {
	case MMC_TIMING_LEGACY:
		str = "legacy";
		break;
	case MMC_TIMING_MMC_HS:
		str = "mmc high-speed";
		break;
	case MMC_TIMING_SD_HS:
		str = "sd high-speed";
		break;
	case MMC_TIMING_UHS_SDR50:
		str = "sd uhs SDR50";
		break;
	case MMC_TIMING_UHS_SDR104:
		str = "sd uhs SDR104";
		break;
	case MMC_TIMING_UHS_DDR50:
		str = "sd uhs DDR50";
		break;
	case MMC_TIMING_MMC_HS200:
		str = "mmc high-speed SDR200";
		break;
#ifdef CONFIG_EMMC_50_FEATURE
	case MMC_TIMING_MMC_HS400:
		str = "mmc high-speed DDR200(HS400)";
		break;
#endif
	default:
		str = "invalid";
		break;
	}
	seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);

	switch (ios->signal_voltage) {
	case MMC_SIGNAL_VOLTAGE_330:
		str = "3.30 V";
		break;
	case MMC_SIGNAL_VOLTAGE_180:
		str = "1.80 V";
		break;
	case MMC_SIGNAL_VOLTAGE_120:
		str = "1.20 V";
		break;
	default:
		str = "invalid";
		break;
	}
	seq_printf(s, "signal voltage:\t%u (%s)\n", ios->chip_select, str);

	return 0;
}

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

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

static int mmc_clock_opt_get(void *data, u64 *val)
{
	struct mmc_host *host = data;

	*val = host->ios.clock;

	return 0;
}

static int mmc_clock_opt_set(void *data, u64 val)
{
	struct mmc_host *host = data;

	/* We need this check due to input value is u64 */
	if (val > host->f_max)
		return -EINVAL;

	mmc_claim_host(host);
	mmc_set_clock(host, (unsigned int) val);
	mmc_release_host(host);

	return 0;
}

DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
	"%llu\n");

void mmc_add_host_debugfs(struct mmc_host *host)
{
	struct dentry *root;

	root = debugfs_create_dir(mmc_hostname(host), NULL);
	if (IS_ERR(root))
		/* Don't complain -- debugfs just isn't enabled */
		return;
	if (!root)
		/* Complain -- debugfs is enabled, but it failed to
		 * create the directory. */
		goto err_root;

	host->debugfs_root = root;

	if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
		goto err_node;

	if (!debugfs_create_file("clock", S_IRUSR | S_IWUSR, root, host,
			&mmc_clock_fops))
		goto err_node;

#ifdef CONFIG_MMC_CLKGATE
	if (!debugfs_create_u32("clk_delay", (S_IRUSR | S_IWUSR),
				root, &host->clk_delay))
		goto err_node;
#endif
#ifdef CONFIG_FAIL_MMC_REQUEST
	if (fail_request)
		setup_fault_attr(&fail_default_attr, fail_request);
	host->fail_mmc_request = fail_default_attr;
	if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
					     root,
					     &host->fail_mmc_request)))
		goto err_node;
#endif
	return;

err_node:
	debugfs_remove_recursive(root);
	host->debugfs_root = NULL;
err_root:
	dev_err(&host->class_dev, "failed to initialize debugfs\n");
}

void mmc_remove_host_debugfs(struct mmc_host *host)
{
	debugfs_remove_recursive(host->debugfs_root);
}

static int mmc_dbg_card_status_get(void *data, u64 *val)
{
	struct mmc_card	*card = data;
	u32		status;
	int		ret;

	mmc_claim_host(card->host);

	ret = mmc_send_status(data, &status);
	if (!ret)
		*val = status;

	mmc_release_host(card->host);

	return ret;
}
DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
		NULL, "%08llx\n");

#define EXT_CSD_STR_LEN 1025

static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
{
	struct mmc_card *card = inode->i_private;
	char *buf;
	ssize_t n = 0;
	u8 *ext_csd;
	int err, i;

	buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
	if (!buf)
		return -ENOMEM;

	ext_csd = kmalloc(512, GFP_KERNEL);
	if (!ext_csd) {
		err = -ENOMEM;
		goto out_free;
	}

	mmc_claim_host(card->host);
	err = mmc_send_ext_csd(card, ext_csd);
	mmc_release_host(card->host);
	if (err)
		goto out_free;

	for (i = 0; i < 512; i++)
		n += sprintf(buf + n, "%02x", ext_csd[i]);
	n += sprintf(buf + n, "\n");
	BUG_ON(n != EXT_CSD_STR_LEN);

	filp->private_data = buf;
	kfree(ext_csd);
	return 0;

out_free:
	kfree(buf);
	kfree(ext_csd);
	return err;
}

static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
				size_t cnt, loff_t *ppos)
{
	char *buf = filp->private_data;

	return simple_read_from_buffer(ubuf, cnt, ppos,
				       buf, EXT_CSD_STR_LEN);
}

static int mmc_ext_csd_release(struct inode *inode, struct file *file)
{
	kfree(file->private_data);
	return 0;
}

static const struct file_operations mmc_dbg_ext_csd_fops = {
	.open		= mmc_ext_csd_open,
	.read		= mmc_ext_csd_read,
	.release	= mmc_ext_csd_release,
	.llseek		= default_llseek,
};

void mmc_add_card_debugfs(struct mmc_card *card)
{
	struct mmc_host	*host = card->host;
	struct dentry	*root;

	if (!host->debugfs_root)
		return;

	root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
	if (IS_ERR(root))
		/* Don't complain -- debugfs just isn't enabled */
		return;
	if (!root)
		/* Complain -- debugfs is enabled, but it failed to
		 * create the directory. */
		goto err;

	card->debugfs_root = root;

	if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
		goto err;

	if (mmc_card_mmc(card) || mmc_card_sd(card))
		if (!debugfs_create_file("status", S_IRUSR, root, card,
					&mmc_dbg_card_status_fops))
			goto err;

	if (mmc_card_mmc(card))
		if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
					&mmc_dbg_ext_csd_fops))
			goto err;

	return;

err:
	debugfs_remove_recursive(root);
	card->debugfs_root = NULL;
	dev_err(&card->dev, "failed to initialize debugfs\n");
}

void mmc_remove_card_debugfs(struct mmc_card *card)
{
	debugfs_remove_recursive(card->debugfs_root);
}
Commit	Line	Data
6edd8ee6 HS	1	/*
	2	* Debugfs support for hosts and cards
	3	*
	4	* Copyright (C) 2008 Atmel Corporation
	5	*
	6	* This program is free software; you can redistribute it and/or modify
	7	* it under the terms of the GNU General Public License version 2 as
	8	* published by the Free Software Foundation.
	9	*/
3f102ae9	10	#include <linux/moduleparam.h>
3ef77af1	11	#include <linux/export.h>
6edd8ee6 HS	12	#include <linux/debugfs.h>
	13	#include <linux/fs.h>
	14	#include <linux/seq_file.h>
5a0e3ad6	15	#include <linux/slab.h>
6edd8ee6	16	#include <linux/stat.h>
1b676f70	17	#include <linux/fault-inject.h>
6edd8ee6	18
f4b7f927	19	#include <linux/mmc/card.h>
6edd8ee6 HS	20	#include <linux/mmc/host.h>
	21
	22	#include "core.h"
f4b7f927	23	#include "mmc_ops.h"
6edd8ee6	24
34f50508 PF	25	#ifdef CONFIG_FAIL_MMC_REQUEST
	26
	27	static DECLARE_FAULT_ATTR(fail_default_attr);
	28	static char *fail_request;
	29	module_param(fail_request, charp, 0);
	30
	31	#endif /* CONFIG_FAIL_MMC_REQUEST */
	32
6edd8ee6 HS	33	/* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
	34	static int mmc_ios_show(struct seq_file s, void data)
	35	{
	36	static const char *vdd_str[] = {
	37	[8] = "2.0",
	38	[9] = "2.1",
	39	[10] = "2.2",
	40	[11] = "2.3",
	41	[12] = "2.4",
	42	[13] = "2.5",
	43	[14] = "2.6",
	44	[15] = "2.7",
	45	[16] = "2.8",
	46	[17] = "2.9",
	47	[18] = "3.0",
	48	[19] = "3.1",
	49	[20] = "3.2",
	50	[21] = "3.3",
	51	[22] = "3.4",
	52	[23] = "3.5",
	53	[24] = "3.6",
	54	};
	55	struct mmc_host *host = s->private;
	56	struct mmc_ios *ios = &host->ios;
	57	const char *str;
	58
	59	seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
df16219f GC	60	if (host->actual_clock)
df16219f GC	61	seq_printf(s, "actual clock:\t%u Hz\n", host->actual_clock);
6edd8ee6 HS	62	seq_printf(s, "vdd:\t\t%u ", ios->vdd);
	63	if ((1 << ios->vdd) & MMC_VDD_165_195)
	64	seq_printf(s, "(1.65 - 1.95 V)\n");
	65	else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
	66	&& vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
	67	seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
	68	vdd_str[ios->vdd + 1]);
	69	else
	70	seq_printf(s, "(invalid)\n");
	71
	72	switch (ios->bus_mode) {
	73	case MMC_BUSMODE_OPENDRAIN:
	74	str = "open drain";
	75	break;
	76	case MMC_BUSMODE_PUSHPULL:
	77	str = "push-pull";
	78	break;
	79	default:
	80	str = "invalid";
	81	break;
	82	}
	83	seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
	84
	85	switch (ios->chip_select) {
	86	case MMC_CS_DONTCARE:
	87	str = "don't care";
	88	break;
	89	case MMC_CS_HIGH:
	90	str = "active high";
	91	break;
	92	case MMC_CS_LOW:
	93	str = "active low";
	94	break;
	95	default:
	96	str = "invalid";
	97	break;
	98	}
	99	seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
	100
	101	switch (ios->power_mode) {
	102	case MMC_POWER_OFF:
	103	str = "off";
	104	break;
	105	case MMC_POWER_UP:
	106	str = "up";
	107	break;
	108	case MMC_POWER_ON:
	109	str = "on";
	110	break;
	111	default:
	112	str = "invalid";
	113	break;
	114	}
	115	seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
	116	seq_printf(s, "bus width:\t%u (%u bits)\n",
	117	ios->bus_width, 1 << ios->bus_width);
	118
	119	switch (ios->timing) {
	120	case MMC_TIMING_LEGACY:
	121	str = "legacy";
	122	break;
	123	case MMC_TIMING_MMC_HS:
	124	str = "mmc high-speed";
	125	break;
126	case MMC_TIMING_SD_HS:
127	str = "sd high-speed";
128	break;
cd8a3666 AL	129	case MMC_TIMING_UHS_SDR50:
	130	str = "sd uhs SDR50";
	131	break;
	132	case MMC_TIMING_UHS_SDR104:
	133	str = "sd uhs SDR104";
	134	break;
	135	case MMC_TIMING_UHS_DDR50:
	136	str = "sd uhs DDR50";
	137	break;
a4924c71 G	138	case MMC_TIMING_MMC_HS200:
	139	str = "mmc high-speed SDR200";
	140	break;
6fa3eb70 S	141	#ifdef CONFIG_EMMC_50_FEATURE
	142	case MMC_TIMING_MMC_HS400:
	143	str = "mmc high-speed DDR200(HS400)";
	144	break;
	145	#endif
6edd8ee6 HS	146	default:
	147	str = "invalid";
	148	break;
	149	}
	150	seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
	151
42cd95a0 JR	152	switch (ios->signal_voltage) {
	153	case MMC_SIGNAL_VOLTAGE_330:
	154	str = "3.30 V";
	155	break;
	156	case MMC_SIGNAL_VOLTAGE_180:
	157	str = "1.80 V";
	158	break;
	159	case MMC_SIGNAL_VOLTAGE_120:
	160	str = "1.20 V";
	161	break;
	162	default:
	163	str = "invalid";
	164	break;
	165	}
	166	seq_printf(s, "signal voltage:\t%u (%s)\n", ios->chip_select, str);
	167
6edd8ee6 HS	168	return 0;
	169	}
	170
	171	static int mmc_ios_open(struct inode inode, struct file file)
	172	{
	173	return single_open(file, mmc_ios_show, inode->i_private);
	174	}
	175
	176	static const struct file_operations mmc_ios_fops = {
	177	.open = mmc_ios_open,
	178	.read = seq_read,
	179	.llseek = seq_lseek,
	180	.release = single_release,
	181	};
	182
703aae3d AS	183	static int mmc_clock_opt_get(void data, u64 val)
	184	{
	185	struct mmc_host *host = data;
	186
	187	*val = host->ios.clock;
	188
	189	return 0;
	190	}
	191
	192	static int mmc_clock_opt_set(void *data, u64 val)
	193	{
	194	struct mmc_host *host = data;
	195
	196	/* We need this check due to input value is u64 */
	197	if (val > host->f_max)
	198	return -EINVAL;
	199
	200	mmc_claim_host(host);
	201	mmc_set_clock(host, (unsigned int) val);
	202	mmc_release_host(host);
	203
	204	return 0;
	205	}
	206
	207	DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
	208	"%llu\n");
	209
6edd8ee6 HS	210	void mmc_add_host_debugfs(struct mmc_host *host)
	211	{
	212	struct dentry *root;
	213
	214	root = debugfs_create_dir(mmc_hostname(host), NULL);
	215	if (IS_ERR(root))
	216	/* Don't complain -- debugfs just isn't enabled */
	217	return;
	218	if (!root)
	219	/* Complain -- debugfs is enabled, but it failed to
	220	* create the directory. */
	221	goto err_root;
	222
	223	host->debugfs_root = root;
	224
	225	if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
703aae3d AS	226	goto err_node;
	227
	228	if (!debugfs_create_file("clock", S_IRUSR \| S_IWUSR, root, host,
	229	&mmc_clock_fops))
	230	goto err_node;
6edd8ee6	231
04566831 LW	232	#ifdef CONFIG_MMC_CLKGATE
	233	if (!debugfs_create_u32("clk_delay", (S_IRUSR \| S_IWUSR),
	234	root, &host->clk_delay))
	235	goto err_node;
1b676f70 PF	236	#endif
1b676f70 PF	237	#ifdef CONFIG_FAIL_MMC_REQUEST
34f50508 PF	238	if (fail_request)
	239	setup_fault_attr(&fail_default_attr, fail_request);
	240	host->fail_mmc_request = fail_default_attr;
1b676f70 PF	241	if (IS_ERR(fault_create_debugfs_attr("fail_mmc_request",
	242	root,
	243	&host->fail_mmc_request)))
	244	goto err_node;
04566831	245	#endif
6edd8ee6 HS	246	return;
6edd8ee6 HS	247
703aae3d	248	err_node:
6edd8ee6 HS	249	debugfs_remove_recursive(root);
	250	host->debugfs_root = NULL;
	251	err_root:
	252	dev_err(&host->class_dev, "failed to initialize debugfs\n");
	253	}
	254
	255	void mmc_remove_host_debugfs(struct mmc_host *host)
	256	{
	257	debugfs_remove_recursive(host->debugfs_root);
	258	}
f4b7f927 HS	259
	260	static int mmc_dbg_card_status_get(void data, u64 val)
	261	{
	262	struct mmc_card *card = data;
	263	u32 status;
	264	int ret;
	265
	266	mmc_claim_host(card->host);
	267
	268	ret = mmc_send_status(data, &status);
	269	if (!ret)
	270	*val = status;
	271
	272	mmc_release_host(card->host);
	273
	274	return ret;
	275	}
	276	DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
	277	NULL, "%08llx\n");
	278
736bb6bb AH	279	#define EXT_CSD_STR_LEN 1025
	280
	281	static int mmc_ext_csd_open(struct inode inode, struct file filp)
	282	{
	283	struct mmc_card *card = inode->i_private;
	284	char *buf;
	285	ssize_t n = 0;
	286	u8 *ext_csd;
	287	int err, i;
	288
	289	buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
	290	if (!buf)
	291	return -ENOMEM;
	292
	293	ext_csd = kmalloc(512, GFP_KERNEL);
	294	if (!ext_csd) {
	295	err = -ENOMEM;
	296	goto out_free;
	297	}
	298
	299	mmc_claim_host(card->host);
	300	err = mmc_send_ext_csd(card, ext_csd);
	301	mmc_release_host(card->host);
	302	if (err)
	303	goto out_free;
	304
6780162c	305	for (i = 0; i < 512; i++)
736bb6bb AH	306	n += sprintf(buf + n, "%02x", ext_csd[i]);
	307	n += sprintf(buf + n, "\n");
	308	BUG_ON(n != EXT_CSD_STR_LEN);
	309
	310	filp->private_data = buf;
	311	kfree(ext_csd);
	312	return 0;
	313
	314	out_free:
	315	kfree(buf);
	316	kfree(ext_csd);
	317	return err;
	318	}
	319
	320	static ssize_t mmc_ext_csd_read(struct file filp, char __user ubuf,
	321	size_t cnt, loff_t *ppos)
	322	{
	323	char *buf = filp->private_data;
	324
	325	return simple_read_from_buffer(ubuf, cnt, ppos,
	326	buf, EXT_CSD_STR_LEN);
	327	}
	328
	329	static int mmc_ext_csd_release(struct inode inode, struct file file)
	330	{
	331	kfree(file->private_data);
	332	return 0;
	333	}
	334
828c0950	335	static const struct file_operations mmc_dbg_ext_csd_fops = {
736bb6bb AH	336	.open = mmc_ext_csd_open,
	337	.read = mmc_ext_csd_read,
	338	.release = mmc_ext_csd_release,
6038f373	339	.llseek = default_llseek,
736bb6bb AH	340	};
736bb6bb AH	341
f4b7f927 HS	342	void mmc_add_card_debugfs(struct mmc_card *card)
	343	{
	344	struct mmc_host *host = card->host;
	345	struct dentry *root;
	346
	347	if (!host->debugfs_root)
	348	return;
	349
	350	root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
	351	if (IS_ERR(root))
	352	/* Don't complain -- debugfs just isn't enabled */
	353	return;
	354	if (!root)
	355	/* Complain -- debugfs is enabled, but it failed to
	356	* create the directory. */
	357	goto err;
	358
	359	card->debugfs_root = root;
	360
	361	if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
	362	goto err;
	363
	364	if (mmc_card_mmc(card) \|\| mmc_card_sd(card))
	365	if (!debugfs_create_file("status", S_IRUSR, root, card,
	366	&mmc_dbg_card_status_fops))
	367	goto err;
	368
736bb6bb AH	369	if (mmc_card_mmc(card))
	370	if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
	371	&mmc_dbg_ext_csd_fops))
	372	goto err;
	373
f4b7f927 HS	374	return;
	375
	376	err:
	377	debugfs_remove_recursive(root);
	378	card->debugfs_root = NULL;
	379	dev_err(&card->dev, "failed to initialize debugfs\n");
	380	}
	381
	382	void mmc_remove_card_debugfs(struct mmc_card *card)
	383	{
	384	debugfs_remove_recursive(card->debugfs_root);
	385	}