[PATCH v5,8/8] media: mediatek: vcodec: Add dbgfs help function

From: Yunfei Dong
Date: Wed May 24 2023 - 22:13:05 EST


Getting dbgfs help information with command "echo -help > vdec".

Signed-off-by: Yunfei Dong <yunfei.dong@xxxxxxxxxxxx>
---
.../mediatek/vcodec/mtk_vcodec_dbgfs.c | 24 ++++++++++++++++++-
1 file changed, 23 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c
index 237d0dc8a1fc..2372fc449b45 100644
--- a/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c
+++ b/drivers/media/platform/mediatek/vcodec/mtk_vcodec_dbgfs.c
@@ -52,6 +52,23 @@ static void mtk_vdec_dbgfs_get_format_type(struct mtk_vcodec_ctx *ctx, char *buf
*used += curr_len;
}

+static void mtk_vdec_dbgfs_get_help(char *buf, int *used, int total)
+{
+ int curr_len;
+
+ curr_len = snprintf(buf + *used, total - *used,
+ "help: (1: echo -'info' > vdec 2: cat vdec)\n");
+ *used += curr_len;
+
+ curr_len = snprintf(buf + *used, total - *used,
+ "\t-picinfo: get resolution\n");
+ *used += curr_len;
+
+ curr_len = snprintf(buf + *used, total - *used,
+ "\t-format: get output & capture queue format\n");
+ *used += curr_len;
+}
+
static ssize_t mtk_vdec_dbgfs_write(struct file *filp, const char __user *ubuf,
size_t count, loff_t *ppos)
{
@@ -84,6 +101,11 @@ static ssize_t mtk_vdec_dbgfs_read(struct file *filp, char __user *ubuf,
if (!buf)
return -ENOMEM;

+ if (strstr(dbgfs->dbgfs_buf, "-help")) {
+ mtk_vdec_dbgfs_get_help(buf, &used_len, total_len);
+ goto read_buffer;
+ }
+
if (strstr(dbgfs->dbgfs_buf, "-picinfo"))
dbgfs_index[MTK_VDEC_DBGFS_PICINFO] = true;

@@ -110,7 +132,7 @@ static ssize_t mtk_vdec_dbgfs_read(struct file *filp, char __user *ubuf,
mtk_vdec_dbgfs_get_format_type(ctx, buf, &used_len, total_len);
}
mutex_unlock(&dbgfs->dbgfs_lock);
-
+read_buffer:
ret = simple_read_from_buffer(ubuf, count, ppos, buf, used_len);
kfree(buf);
return ret;
--
2.25.1