linux-kernel - [PATCH 6/7] media: cedrus: Add helper for determining number of elements

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Message-Id: <20220620175517.648767-7-jernej.skrabec@gmail.com>
Date:   Mon, 20 Jun 2022 19:55:16 +0200
From:   Jernej Skrabec <jernej.skrabec@...il.com>
To:     mripard@...nel.org, paul.kocialkowski@...tlin.com, wens@...e.org,
        samuel@...lland.org
Cc:     mchehab@...nel.org, gregkh@...uxfoundation.org,
        hverkuil-cisco@...all.nl, linux-media@...r.kernel.org,
        linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-sunxi@...ts.linux.dev,
        linux-kernel@...r.kernel.org,
        Jernej Skrabec <jernej.skrabec@...il.com>
Subject: [PATCH 6/7] media: cedrus: Add helper for determining number of elements

Now that controls can be dynamic arrays, we need to know how many
elements are in such array. Add a helper for that.

Signed-off-by: Jernej Skrabec <jernej.skrabec@...il.com>
---
 drivers/staging/media/sunxi/cedrus/cedrus.c | 11 +++++++++++
 drivers/staging/media/sunxi/cedrus/cedrus.h |  1 +
 2 files changed, 12 insertions(+)

diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.c b/drivers/staging/media/sunxi/cedrus/cedrus.c
index 99c87319d2b4..b855e608885c 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus.c
+++ b/drivers/staging/media/sunxi/cedrus/cedrus.c
@@ -232,6 +232,17 @@ void *cedrus_find_control_data(struct cedrus_ctx *ctx, u32 id)
 	return NULL;
 }
 
+u32 cedrus_get_num_of_controls(struct cedrus_ctx *ctx, u32 id)
+{
+	unsigned int i;
+
+	for (i = 0; ctx->ctrls[i]; i++)
+		if (ctx->ctrls[i]->id == id)
+			return ctx->ctrls[i]->elems;
+
+	return 0;
+}
+
 static int cedrus_init_ctrls(struct cedrus_dev *dev, struct cedrus_ctx *ctx)
 {
 	struct v4l2_ctrl_handler *hdl = &ctx->hdl;
diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.h b/drivers/staging/media/sunxi/cedrus/cedrus.h
index d2b697a9ded2..15a1bdbf6a1f 100644
--- a/drivers/staging/media/sunxi/cedrus/cedrus.h
+++ b/drivers/staging/media/sunxi/cedrus/cedrus.h
@@ -261,5 +261,6 @@ vb2_to_cedrus_buffer(const struct vb2_buffer *p)
 }
 
 void *cedrus_find_control_data(struct cedrus_ctx *ctx, u32 id);
+u32 cedrus_get_num_of_controls(struct cedrus_ctx *ctx, u32 id);
 
 #endif
-- 
2.36.1