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From:   Yunfei Dong <yunfei.dong@mediatek.com>
To:     Yunfei Dong <yunfei.dong@mediatek.com>,
        Chen-Yu Tsai <wenst@chromium.org>,
        Nicolas Dufresne <nicolas@ndufresne.ca>,
        Hans Verkuil <hverkuil-cisco@xs4all.nl>,
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        <angelogioacchino.delregno@collabora.com>,
        Benjamin Gaignard <benjamin.gaignard@collabora.com>,
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CC:     Matthias Brugger <matthias.bgg@gmail.com>,
        Hsin-Yi Wang <hsinyi@chromium.org>,
        Fritz Koenig <frkoenig@chromium.org>,
        Daniel Vetter <daniel@ffwll.ch>,
        Steve Cho <stevecho@chromium.org>,
        <linux-media@vger.kernel.org>, <devicetree@vger.kernel.org>,
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Subject: [PATCH v4,8/8] media: mediatek: vcodec: Add dbgfs help function
Date:   Tue, 4 Apr 2023 16:11:02 +0800
Message-ID: <20230404081102.30713-9-yunfei.dong@mediatek.com>
In-Reply-To: <20230404081102.30713-1-yunfei.dong@mediatek.com>
References: <20230404081102.30713-1-yunfei.dong@mediatek.com>
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Getting dbgfs help information with command "echo -help > vdec".

Signed-off-by: Yunfei Dong <yunfei.dong@mediatek.com>
---
 .../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;
-- 
2.18.0