Commit 6edd8ee6 authored by Haavard Skinnemoen's avatar Haavard Skinnemoen Committed by Pierre Ossman
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mmc: Export internal host state through debugfs 



When CONFIG_DEBUG_FS is set, create a few files under /sys/kernel/debug
containing information about an mmc host's internal state. Currently,
just a single file is created, "ios", which contains information about
the current operating parameters for the bus (clock speed, bus width,
etc.)

Host drivers can add additional files and directories under the host's
root directory by passing the debugfs_root field in struct mmc_host as
the 'parent' parameter to debugfs_create_*.

Signed-off-by: default avatarHaavard Skinnemoen <haavard.skinnemoen@atmel.com>
Signed-off-by: default avatarPierre Ossman <drzeus@drzeus.cx>
parent c5d5e9c4

drivers/mmc/core/Makefile

+1 −0
Original line number Diff line number Diff line
@@ -12,3 +12,4 @@ mmc_core-y := core.o bus.o host.o \ 
				   sdio.o sdio_ops.o sdio_bus.o \

				   sdio_cis.o sdio_io.o sdio_irq.o



mmc_core-$(CONFIG_DEBUG_FS)	+= debugfs.o

drivers/mmc/core/core.h

+4 −0
Original line number Diff line number Diff line
@@ -52,5 +52,9 @@ int mmc_attach_sdio(struct mmc_host *host, u32 ocr); 


extern int use_spi_crc;



/* Debugfs information for hosts and cards */

void mmc_add_host_debugfs(struct mmc_host *host);

void mmc_remove_host_debugfs(struct mmc_host *host);



#endif

drivers/mmc/core/debugfs.c

0 → 100644
+164 −0
Original line number Diff line number Diff line 
/*

 * 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/stat.h>



#include <linux/mmc/host.h>



#include "core.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,

};



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_ios;



	return;



err_ios:

	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);

}

drivers/mmc/core/host.c

+8 −0
Original line number Diff line number Diff line
@@ -127,6 +127,10 @@ int mmc_add_host(struct mmc_host *host) 
	if (err)

		return err;



#ifdef CONFIG_DEBUG_FS

	mmc_add_host_debugfs(host);

#endif



	mmc_start_host(host);



	return 0;
@@ -146,6 +150,10 @@ void mmc_remove_host(struct mmc_host *host) 
{

	mmc_stop_host(host);



#ifdef CONFIG_DEBUG_FS

	mmc_remove_host_debugfs(host);

#endif



	device_del(&host->class_dev);



	led_trigger_unregister_simple(host->led);

include/linux/mmc/host.h

+2 −0
Original line number Diff line number Diff line
@@ -157,6 +157,8 @@ struct mmc_host { 
	struct led_trigger	*led;		/* activity led */

#endif



	struct dentry		*debugfs_root;



	unsigned long		private[0] ____cacheline_aligned;

};

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