[PATCH V4 4/7] 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>
---
 drivers/mmc/core/debugfs.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
index db0988c..7d78eac 100644
--- a/drivers/mmc/core/debugfs.c
+++ b/drivers/mmc/core/debugfs.c
@@ -222,6 +222,19 @@ static int mmc_clock_opt_set(void *data, u64 val)
 
 DEFINE_DEBUGFS_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;
+
+	if (!host)
+		return -EINVAL;
+
+	*val = host->err_state ? 1 : 0;
+
+	return 0;
+}
+
+DEFINE_SIMPLE_ATTRIBUTE(mmc_err_state, mmc_err_state_get, NULL, "%llu\n");
 
 static int mmc_err_stats_show(struct seq_file *file, void *data)
 {
@@ -293,6 +306,8 @@ void mmc_add_host_debugfs(struct mmc_host *host)
 	debugfs_create_file_unsafe("clock", S_IRUSR | S_IWUSR, root, host,
 				   &mmc_clock_fops);
 
+	debugfs_create_file("err_state", 0600, root, host,
+		&mmc_err_state);
 	debugfs_create_file("err_stats", 0600, root, host,
 		&mmc_err_stats_fops);
 
-- 
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