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/slab.h>
14 #include <linux/stat.h>
16 #include <linux/mmc/card.h>
17 #include <linux/mmc/host.h>
22 /* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
23 static int mmc_ios_show(struct seq_file *s, void *data)
25 static const char *vdd_str[] = {
44 struct mmc_host *host = s->private;
45 struct mmc_ios *ios = &host->ios;
48 seq_printf(s, "clock:\t\t%u Hz\n", ios->clock);
49 seq_printf(s, "vdd:\t\t%u ", ios->vdd);
50 if ((1 << ios->vdd) & MMC_VDD_165_195)
51 seq_printf(s, "(1.65 - 1.95 V)\n");
52 else if (ios->vdd < (ARRAY_SIZE(vdd_str) - 1)
53 && vdd_str[ios->vdd] && vdd_str[ios->vdd + 1])
54 seq_printf(s, "(%s ~ %s V)\n", vdd_str[ios->vdd],
55 vdd_str[ios->vdd + 1]);
57 seq_printf(s, "(invalid)\n");
59 switch (ios->bus_mode) {
60 case MMC_BUSMODE_OPENDRAIN:
63 case MMC_BUSMODE_PUSHPULL:
70 seq_printf(s, "bus mode:\t%u (%s)\n", ios->bus_mode, str);
72 switch (ios->chip_select) {
86 seq_printf(s, "chip select:\t%u (%s)\n", ios->chip_select, str);
88 switch (ios->power_mode) {
102 seq_printf(s, "power mode:\t%u (%s)\n", ios->power_mode, str);
103 seq_printf(s, "bus width:\t%u (%u bits)\n",
104 ios->bus_width, 1 << ios->bus_width);
106 switch (ios->timing) {
107 case MMC_TIMING_LEGACY:
110 case MMC_TIMING_MMC_HS:
111 str = "mmc high-speed";
113 case MMC_TIMING_SD_HS:
114 str = "sd high-speed";
120 seq_printf(s, "timing spec:\t%u (%s)\n", ios->timing, str);
125 static int mmc_ios_open(struct inode *inode, struct file *file)
127 return single_open(file, mmc_ios_show, inode->i_private);
130 static const struct file_operations mmc_ios_fops = {
131 .open = mmc_ios_open,
134 .release = single_release,
137 void mmc_add_host_debugfs(struct mmc_host *host)
141 root = debugfs_create_dir(mmc_hostname(host), NULL);
143 /* Don't complain -- debugfs just isn't enabled */
146 /* Complain -- debugfs is enabled, but it failed to
147 * create the directory. */
150 host->debugfs_root = root;
152 if (!debugfs_create_file("ios", S_IRUSR, root, host, &mmc_ios_fops))
158 debugfs_remove_recursive(root);
159 host->debugfs_root = NULL;
161 dev_err(&host->class_dev, "failed to initialize debugfs\n");
164 void mmc_remove_host_debugfs(struct mmc_host *host)
166 debugfs_remove_recursive(host->debugfs_root);
169 static int mmc_dbg_card_status_get(void *data, u64 *val)
171 struct mmc_card *card = data;
175 mmc_claim_host(card->host);
177 ret = mmc_send_status(data, &status);
181 mmc_release_host(card->host);
185 DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
188 #define EXT_CSD_STR_LEN 1025
190 static int mmc_ext_csd_open(struct inode *inode, struct file *filp)
192 struct mmc_card *card = inode->i_private;
198 buf = kmalloc(EXT_CSD_STR_LEN + 1, GFP_KERNEL);
202 ext_csd = kmalloc(512, GFP_KERNEL);
208 mmc_claim_host(card->host);
209 err = mmc_send_ext_csd(card, ext_csd);
210 mmc_release_host(card->host);
214 for (i = 511; i >= 0; i--)
215 n += sprintf(buf + n, "%02x", ext_csd[i]);
216 n += sprintf(buf + n, "\n");
217 BUG_ON(n != EXT_CSD_STR_LEN);
219 filp->private_data = buf;
229 static ssize_t mmc_ext_csd_read(struct file *filp, char __user *ubuf,
230 size_t cnt, loff_t *ppos)
232 char *buf = filp->private_data;
234 return simple_read_from_buffer(ubuf, cnt, ppos,
235 buf, EXT_CSD_STR_LEN);
238 static int mmc_ext_csd_release(struct inode *inode, struct file *file)
240 kfree(file->private_data);
244 static const struct file_operations mmc_dbg_ext_csd_fops = {
245 .open = mmc_ext_csd_open,
246 .read = mmc_ext_csd_read,
247 .release = mmc_ext_csd_release,
250 void mmc_add_card_debugfs(struct mmc_card *card)
252 struct mmc_host *host = card->host;
255 if (!host->debugfs_root)
258 root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
260 /* Don't complain -- debugfs just isn't enabled */
263 /* Complain -- debugfs is enabled, but it failed to
264 * create the directory. */
267 card->debugfs_root = root;
269 if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
272 if (mmc_card_mmc(card) || mmc_card_sd(card))
273 if (!debugfs_create_file("status", S_IRUSR, root, card,
274 &mmc_dbg_card_status_fops))
277 if (mmc_card_mmc(card))
278 if (!debugfs_create_file("ext_csd", S_IRUSR, root, card,
279 &mmc_dbg_ext_csd_fops))
285 debugfs_remove_recursive(root);
286 card->debugfs_root = NULL;
287 dev_err(&card->dev, "failed to initialize debugfs\n");
290 void mmc_remove_card_debugfs(struct mmc_card *card)
292 debugfs_remove_recursive(card->debugfs_root);