/* * 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 "card.h"#include "host.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_card_hs400es(host->card) ?			"mmc HS400 enhanced strobe" : "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 != 0 && (val > host->f_max || val < host->f_min))		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"); 	if (n != EXT_CSD_STR_LEN) {		err = -EINVAL;		goto out_free;	} 	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);}