/*
* 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/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,
};
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);
}
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,
};
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);
}
