2 * Debugfs support for hosts and cards
4 * Copyright (C) 2008 Atmel Corporation
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.
10 #include <linux/debugfs.h>
12 #include <linux/seq_file.h>
13 #include <linux/stat.h>
15 #include <linux/mmc/host.h>
19 /* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
20 static int mmc_ios_show(struct seq_file *s, void *data)
22 static const char *vdd_str[] = {
41 struct mmc_host *host = s->private;
42 struct mmc_ios *ios = &host->ios;
45 seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
46 seq_printf(s, "vdd:\t\t%u ", ios->vdd);
47 if ((1 << ios->vdd) & MMC_VDD_165_195)
48 seq_printf(s, "(1.65 - 1.95 V)\n");
49 else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
50 && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
51 seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
52 vdd_str[ios->vdd + 1]);
54 seq_printf(s, "(invalid)\n");
56 switch (ios->bus_mode) {
57 case MMC_BUSMODE_OPENDRAIN:
60 case MMC_BUSMODE_PUSHPULL:
67 seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
69 switch (ios->chip_select) {
83 seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
85 switch (ios->power_mode) {
99 seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
100 seq_printf(s, "bus width:\t%u (%u bits)\n",
101 ios->bus_width, 1 << ios->bus_width);
103 switch (ios->timing) {
104 case MMC_TIMING_LEGACY:
107 case MMC_TIMING_MMC_HS:
108 str = "mmc high-speed";
110 case MMC_TIMING_SD_HS:
111 str = "sd high-speed";
117 seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
122 static int mmc_ios_open(struct inode *inode, struct file *file)
124 return single_open(file, mmc_ios_show, inode->i_private);
127 static const struct file_operations mmc_ios_fops = {
128 .open = mmc_ios_open,
131 .release = single_release,
134 void mmc_add_host_debugfs(struct mmc_host *host)
138 root = debugfs_create_dir(mmc_hostname(host), NULL);
140 /* Don't complain -- debugfs just isn't enabled */
143 /* Complain -- debugfs is enabled, but it failed to
144 * create the directory. */
147 host->debugfs_root = root;
149 if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
155 debugfs_remove_recursive(root);
156 host->debugfs_root = NULL;
158 dev_err(&host->class_dev, "failed to initialize debugfs\n");
161 void mmc_remove_host_debugfs(struct mmc_host *host)
163 debugfs_remove_recursive(host->debugfs_root);