[deliverable/linux.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/debugfs.h>
#include <linux/fs.h>
#include <linux/seq_file.h>
#include <linux/slab.h>
#include <linux/stat.h>

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

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

/* 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);
	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;
	default:
		str = "invalid";
		break;
	}
	seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, 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;

	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 = 511; i >= 0; 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	*/
	10	#include <linux/debugfs.h>
	11	#include <linux/fs.h>
	12	#include <linux/seq_file.h>
5a0e3ad6	13	#include <linux/slab.h>
6edd8ee6 HS	14	#include <linux/stat.h>
6edd8ee6 HS	15
f4b7f927	16	#include <linux/mmc/card.h>
6edd8ee6 HS	17	#include <linux/mmc/host.h>
	18
	19	#include "core.h"
f4b7f927	20	#include "mmc_ops.h"
6edd8ee6 HS	21
	22	/* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
	23	static int mmc_ios_show(struct seq_file s, void data)
	24	{
	25	static const char *vdd_str[] = {
	26	[8] = "2.0",
	27	[9] = "2.1",
	28	[10] = "2.2",
	29	[11] = "2.3",
	30	[12] = "2.4",
	31	[13] = "2.5",
	32	[14] = "2.6",
	33	[15] = "2.7",
	34	[16] = "2.8",
	35	[17] = "2.9",
	36	[18] = "3.0",
	37	[19] = "3.1",
	38	[20] = "3.2",
	39	[21] = "3.3",
	40	[22] = "3.4",
	41	[23] = "3.5",
	42	[24] = "3.6",
	43	};
	44	struct mmc_host *host = s->private;
	45	struct mmc_ios *ios = &host->ios;
	46	const char *str;
	47
	48	seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
	49	seq_printf(s, "vdd:\t\t%u ", ios->vdd);
	50	if ((1 << ios->vdd) & MMC_VDD_165_195)
	51	seq_printf(s, "(1.65 - 1.95 V)\n");
	52	else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
	53	&& vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
	54	seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
	55	vdd_str[ios->vdd + 1]);
	56	else
	57	seq_printf(s, "(invalid)\n");
	58
	59	switch (ios->bus_mode) {
	60	case MMC_BUSMODE_OPENDRAIN:
	61	str = "open drain";
	62	break;
	63	case MMC_BUSMODE_PUSHPULL:
	64	str = "push-pull";
	65	break;
	66	default:
	67	str = "invalid";
	68	break;
	69	}
	70	seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
	71
	72	switch (ios->chip_select) {
	73	case MMC_CS_DONTCARE:
	74	str = "don't care";
	75	break;
	76	case MMC_CS_HIGH:
	77	str = "active high";
	78	break;
	79	case MMC_CS_LOW:
	80	str = "active low";
	81	break;
	82	default:
	83	str = "invalid";
	84	break;
85	}
86	seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
87
88	switch (ios->power_mode) {
89	case MMC_POWER_OFF:
90	str = "off";
91	break;
92	case MMC_POWER_UP:
93	str = "up";
94	break;
95	case MMC_POWER_ON:
96	str = "on";
97	break;
98	default:
99	str = "invalid";
100	break;
101	}
102	seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
103	seq_printf(s, "bus width:\t%u (%u bits)\n",
104	ios->bus_width, 1 << ios->bus_width);
105
106	switch (ios->timing) {
107	case MMC_TIMING_LEGACY:
108	str = "legacy";
109	break;
110	case MMC_TIMING_MMC_HS:
111	str = "mmc high-speed";
112	break;
113	case MMC_TIMING_SD_HS:
114	str = "sd high-speed";
115	break;
116	default:
117	str = "invalid";
118	break;
119	}
120	seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
121
122	return 0;
123	}
124
125	static int mmc_ios_open(struct inode inode, struct file file)
126	{
127	return single_open(file, mmc_ios_show, inode->i_private);
128	}
129
130	static const struct file_operations mmc_ios_fops = {
131	.open = mmc_ios_open,
132	.read = seq_read,
133	.llseek = seq_lseek,
134	.release = single_release,
135	};
136
703aae3d AS	137	static int mmc_clock_opt_get(void data, u64 val)
	138	{
	139	struct mmc_host *host = data;
	140
	141	*val = host->ios.clock;
	142
	143	return 0;
	144	}
	145
	146	static int mmc_clock_opt_set(void *data, u64 val)
	147	{
	148	struct mmc_host *host = data;
	149
	150	/* We need this check due to input value is u64 */
	151	if (val > host->f_max)
	152	return -EINVAL;
	153
	154	mmc_claim_host(host);
	155	mmc_set_clock(host, (unsigned int) val);
	156	mmc_release_host(host);
	157
	158	return 0;
	159	}
	160
	161	DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
	162	"%llu\n");
	163
6edd8ee6 HS	164	void mmc_add_host_debugfs(struct mmc_host *host)
	165	{
	166	struct dentry *root;
	167
	168	root = debugfs_create_dir(mmc_hostname(host), NULL);
	169	if (IS_ERR(root))
	170	/* Don't complain -- debugfs just isn't enabled */
	171	return;
	172	if (!root)
	173	/* Complain -- debugfs is enabled, but it failed to
	174	* create the directory. */
	175	goto err_root;
	176
	177	host->debugfs_root = root;
	178
	179	if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
703aae3d AS	180	goto err_node;
	181
	182	if (!debugfs_create_file("clock", S_IRUSR \| S_IWUSR, root, host,
	183	&mmc_clock_fops))
	184	goto err_node;
6edd8ee6 HS	185
	186	return;
	187
703aae3d	188	err_node:
6edd8ee6 HS	189	debugfs_remove_recursive(root);
	190	host->debugfs_root = NULL;
	191	err_root:
	192	dev_err(&host->class_dev, "failed to initialize debugfs\n");
	193	}
	194
	195	void mmc_remove_host_debugfs(struct mmc_host *host)
	196	{
	197	debugfs_remove_recursive(host->debugfs_root);
	198	}
f4b7f927 HS	199
	200	static int mmc_dbg_card_status_get(void data, u64 val)
	201	{
	202	struct mmc_card *card = data;
	203	u32 status;
	204	int ret;
	205
	206	mmc_claim_host(card->host);
	207
	208	ret = mmc_send_status(data, &status);
	209	if (!ret)
	210	*val = status;
	211
	212	mmc_release_host(card->host);
	213
	214	return ret;
	215	}
	216	DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
	217	NULL, "%08llx\n");
	218
736bb6bb AH	219	#define EXT_CSD_STR_LEN 1025
	220
	221	static int mmc_ext_csd_open(struct inode inode, struct file filp)
	222	{
	223	struct mmc_card *card = inode->i_private;
	224	char *buf;
	225	ssize_t n = 0;
	226	u8 *ext_csd;
	227	int err, i;
	228
	229	buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
	230	if (!buf)
	231	return -ENOMEM;
	232
	233	ext_csd = kmalloc(512, GFP_KERNEL);
	234	if (!ext_csd) {
	235	err = -ENOMEM;
	236	goto out_free;
	237	}
	238
	239	mmc_claim_host(card->host);
	240	err = mmc_send_ext_csd(card, ext_csd);
	241	mmc_release_host(card->host);
	242	if (err)
	243	goto out_free;
	244
	245	for (i = 511; i >= 0; i--)
	246	n += sprintf(buf + n, "%02x", ext_csd[i]);
	247	n += sprintf(buf + n, "\n");
	248	BUG_ON(n != EXT_CSD_STR_LEN);
	249
	250	filp->private_data = buf;
	251	kfree(ext_csd);
	252	return 0;
	253
	254	out_free:
	255	kfree(buf);
	256	kfree(ext_csd);
	257	return err;
	258	}
	259
	260	static ssize_t mmc_ext_csd_read(struct file filp, char __user ubuf,
	261	size_t cnt, loff_t *ppos)
	262	{
	263	char *buf = filp->private_data;
	264
	265	return simple_read_from_buffer(ubuf, cnt, ppos,
	266	buf, EXT_CSD_STR_LEN);
	267	}
	268
	269	static int mmc_ext_csd_release(struct inode inode, struct file file)
	270	{
	271	kfree(file->private_data);
	272	return 0;
	273	}
	274
828c0950	275	static const struct file_operations mmc_dbg_ext_csd_fops = {
736bb6bb AH	276	.open = mmc_ext_csd_open,
	277	.read = mmc_ext_csd_read,
	278	.release = mmc_ext_csd_release,
6038f373	279	.llseek = default_llseek,
736bb6bb AH	280	};
736bb6bb AH	281
f4b7f927 HS	282	void mmc_add_card_debugfs(struct mmc_card *card)
	283	{
	284	struct mmc_host *host = card->host;
	285	struct dentry *root;
	286
	287	if (!host->debugfs_root)
	288	return;
	289
	290	root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
	291	if (IS_ERR(root))
	292	/* Don't complain -- debugfs just isn't enabled */
	293	return;
	294	if (!root)
	295	/* Complain -- debugfs is enabled, but it failed to
	296	* create the directory. */
	297	goto err;
	298
	299	card->debugfs_root = root;
	300
	301	if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
	302	goto err;
	303
	304	if (mmc_card_mmc(card) \|\| mmc_card_sd(card))
	305	if (!debugfs_create_file("status", S_IRUSR, root, card,
	306	&mmc_dbg_card_status_fops))
	307	goto err;
	308
736bb6bb AH	309	if (mmc_card_mmc(card))
	310	if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
	311	&mmc_dbg_ext_csd_fops))
	312	goto err;
	313
f4b7f927 HS	314	return;
	315
	316	err:
	317	debugfs_remove_recursive(root);
	318	card->debugfs_root = NULL;
	319	dev_err(&card->dev, "failed to initialize debugfs\n");
	320	}
	321
	322	void mmc_remove_card_debugfs(struct mmc_card *card)
	323	{
	324	debugfs_remove_recursive(card->debugfs_root);
	325	}