[PATCH V7 4/4] mmc: debugfs: Add debug fs error state entry for mmc driver

[Shaik Sajida Bhanu]

Add debug fs entry error state to query eMMC and SD card errors statistics.
If any errors occurred in eMMC and SD card driver level then
err_state value will be set to 1.

Signed-off-by: Liangliang Lu <quic_luliang@xxxxxxxxxxx>
Signed-off-by: Sayali Lokhande <quic_sayalil@xxxxxxxxxxx>
Signed-off-by: Bao D. Nguyen <quic_nguyenb@xxxxxxxxxxx>
Signed-off-by: Shaik Sajida Bhanu <quic_c_sbhanu@xxxxxxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
---
 drivers/mmc/core/debugfs.c | 25 +++++++++++++++++++++++++
 1 file changed, 25 insertions(+)

diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
index f9fb51f..d8ff66f 100644
--- a/drivers/mmc/core/debugfs.c
+++ b/drivers/mmc/core/debugfs.c
@@ -234,6 +234,27 @@ static int mmc_clock_opt_set(void *data, u64 val)
 DEFINE_SIMPLE_ATTRIBUTE(mmc_clock_fops, mmc_clock_opt_get, mmc_clock_opt_set,
 	"%llu\n");
 
+static int mmc_err_state_get(void *data, u64 *val)
+{
+	struct mmc_host *host = data;
+	int i;
+
+	if (!host)
+		return -EINVAL;
+
+	*val = 0;
+	for (i = 0; i < MMC_ERR_MAX; i++) {
+		if (host->err_stats[i]) {
+			*val = 1;
+			break;
+		}
+	}
+
+	return 0;
+}
+
+DEFINE_DEBUGFS_ATTRIBUTE(mmc_err_state, mmc_err_state_get, NULL, "%llu\n");
+
 static int mmc_err_stats_show(struct seq_file *file, void *data)
 {
 	struct mmc_host *host = (struct mmc_host *)file->private;
@@ -309,6 +330,10 @@ void mmc_add_host_debugfs(struct mmc_host *host)
 			&mmc_clock_fops))
 		goto err_node;
 
+	if (!debugfs_create_file_unsafe("err_state", 0600, root, host,
+			&mmc_err_state))
+		goto err_node;
+
 	if (!debugfs_create_file("err_stats", 0600, root, host,
 			&mmc_err_stats_fops))
 		goto err_node;
-- 
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