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authorHaavard Skinnemoen <haavard.skinnemoen@atmel.com>2008-07-24 14:18:58 +0200
committerPierre Ossman <drzeus@drzeus.cx>2008-07-27 01:26:17 +0200
commitf4b7f927b531ca350cfc4ca1bdc3377dac7f9a32 (patch)
tree9ad0b50fba46d24deb361a37a28141b12830b443 /drivers/mmc/core
parent6edd8ee60ac9b974bd6ec3b1bcb2aab02762fa8c (diff)
downloadop-kernel-dev-f4b7f927b531ca350cfc4ca1bdc3377dac7f9a32.zip
op-kernel-dev-f4b7f927b531ca350cfc4ca1bdc3377dac7f9a32.tar.gz
mmc: Add per-card debugfs support
For each card successfully added to the bus, create a subdirectory under the host's debugfs root with information about the card. At the moment, only a single file is added to the card directory for all cards: "state". It reflects the "state" field in struct mmc_card, indicating whether the card is present, readonly, etc. For MMC and SD cards (not SDIO), another file is added: "status". Reading this file will ask the card about its current status and return it. This can be useful if the card just refuses to respond to any commands, which might indicate that the card state is not what the MMC core thinks it is (due to a missing stop command, for example.) Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@atmel.com> Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
Diffstat (limited to 'drivers/mmc/core')
-rw-r--r--drivers/mmc/core/bus.c8
-rw-r--r--drivers/mmc/core/core.h3
-rw-r--r--drivers/mmc/core/debugfs.c61
3 files changed, 72 insertions, 0 deletions
diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
index fd95b18..0d9b2d6 100644
--- a/drivers/mmc/core/bus.c
+++ b/drivers/mmc/core/bus.c
@@ -252,6 +252,10 @@ int mmc_add_card(struct mmc_card *card)
if (ret)
return ret;
+#ifdef CONFIG_DEBUG_FS
+ mmc_add_card_debugfs(card);
+#endif
+
mmc_card_set_present(card);
return 0;
@@ -263,6 +267,10 @@ int mmc_add_card(struct mmc_card *card)
*/
void mmc_remove_card(struct mmc_card *card)
{
+#ifdef CONFIG_DEBUG_FS
+ mmc_remove_card_debugfs(card);
+#endif
+
if (mmc_card_present(card)) {
if (mmc_host_is_spi(card->host)) {
printk(KERN_INFO "%s: SPI card removed\n",
diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
index 745da98..c819eff 100644
--- a/drivers/mmc/core/core.h
+++ b/drivers/mmc/core/core.h
@@ -56,5 +56,8 @@ extern int use_spi_crc;
void mmc_add_host_debugfs(struct mmc_host *host);
void mmc_remove_host_debugfs(struct mmc_host *host);
+void mmc_add_card_debugfs(struct mmc_card *card);
+void mmc_remove_card_debugfs(struct mmc_card *card);
+
#endif
diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
index 133c6e5..1237bb4 100644
--- a/drivers/mmc/core/debugfs.c
+++ b/drivers/mmc/core/debugfs.c
@@ -12,9 +12,11 @@
#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)
@@ -162,3 +164,62 @@ 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");
+
+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;
+
+ 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);
+}
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