drivers/mmc/core/debugfs.c - linux - Git at Google

 /*
  * 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_SDR12:
 		str = "sd uhs SDR12";
 		break;
 	case MMC_TIMING_UHS_SDR25:
 		str = "sd uhs SDR25";
 		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_DDR52:
 		str = "mmc DDR52";
 		break;
 	case MMC_TIMING_MMC_HS200:
 		str = "mmc HS200";
 		break;
 	case MMC_TIMING_MMC_HS400:
 		str = "mmc HS400";
 		break;
 	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->signal_voltage, str);

 	switch (ios->drv_type) {
 	case MMC_SET_DRIVER_TYPE_A:
 		str = "driver type A";
 		break;
 	case MMC_SET_DRIVER_TYPE_B:
 		str = "driver type B";
 		break;
 	case MMC_SET_DRIVER_TYPE_C:
 		str = "driver type C";
 		break;
 	case MMC_SET_DRIVER_TYPE_D:
 		str = "driver type D";
 		break;
 	default:
 		str = "invalid";
 		break;
 	}
 	seq_printf(s, "driver type:\t%u (%s)\n", ios->drv_type, 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_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_get_card(card);

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

 	mmc_put_card(card);

 	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;

 	mmc_get_card(card);
 	err = mmc_get_ext_csd(card, &ext_csd);
 	mmc_put_card(card);
 	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);
 	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);
 }
	/*
	* 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_SDR12:
	str = "sd uhs SDR12";
	break;
	case MMC_TIMING_UHS_SDR25:
	str = "sd uhs SDR25";
	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_DDR52:
	str = "mmc DDR52";
	break;
	case MMC_TIMING_MMC_HS200:
	str = "mmc HS200";
	break;
	case MMC_TIMING_MMC_HS400:
	str = "mmc HS400";
	break;
	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->signal_voltage, str);

	switch (ios->drv_type) {
	case MMC_SET_DRIVER_TYPE_A:
	str = "driver type A";
	break;
	case MMC_SET_DRIVER_TYPE_B:
	str = "driver type B";
	break;
	case MMC_SET_DRIVER_TYPE_C:
	str = "driver type C";
	break;
	case MMC_SET_DRIVER_TYPE_D:
	str = "driver type D";
	break;
	default:
	str = "invalid";
	break;
	}
	seq_printf(s, "driver type:\t%u (%s)\n", ios->drv_type, 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_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_get_card(card);

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

	mmc_put_card(card);

	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;

	mmc_get_card(card);
	err = mmc_get_ext_csd(card, &ext_csd);
	mmc_put_card(card);
	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);
	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);
	}