[media] V4L: soc-camera: avoid huge arrays, caused by changed format codes

Recently mediabus pixel format codes have become a part of the user-
space API, at which time their values also have been changed from
contiguous numbers, running from 0 to sparse numbers with values
around 0x1000, 0x2000, 0x3000... This made them unsuitable for the
use as array indices. This patch switches soc-camera internal format
look-ups to not depend on values of those macros.
Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/video/soc_mediabus.c

@@ -15,128 +15,161 @@
 #include <media/v4l2-mediabus.h>
 #include <media/soc_mediabus.h>
 
-#define MBUS_IDX(f) (V4L2_MBUS_FMT_ ## f - V4L2_MBUS_FMT_FIXED - 1)
-
-static const struct soc_mbus_pixelfmt mbus_fmt[] = {
-	[MBUS_IDX(YUYV8_2X8)] = {
+static const struct soc_mbus_lookup mbus_fmt[] = {
+{
+	.code = V4L2_MBUS_FMT_YUYV8_2X8,
+	.fmt = {
 		.fourcc			= V4L2_PIX_FMT_YUYV,
 		.name			= "YUYV",
 		.bits_per_sample	= 8,
 		.packing		= SOC_MBUS_PACKING_2X8_PADHI,
 		.order			= SOC_MBUS_ORDER_LE,
 	},
-	[MBUS_IDX(YVYU8_2X8)] = {
+}, {
+	.code = V4L2_MBUS_FMT_YVYU8_2X8,
+	.fmt = {
 		.fourcc			= V4L2_PIX_FMT_YVYU,
 		.name			= "YVYU",
 		.bits_per_sample	= 8,
 		.packing		= SOC_MBUS_PACKING_2X8_PADHI,
 		.order			= SOC_MBUS_ORDER_LE,
 	},
-	[MBUS_IDX(UYVY8_2X8)] = {
+}, {
+	.code = V4L2_MBUS_FMT_UYVY8_2X8,
+	.fmt = {
 		.fourcc			= V4L2_PIX_FMT_UYVY,
 		.name			= "UYVY",
 		.bits_per_sample	= 8,
 		.packing		= SOC_MBUS_PACKING_2X8_PADHI,
 		.order			= SOC_MBUS_ORDER_LE,
 	},
-	[MBUS_IDX(VYUY8_2X8)] = {
+}, {
+	.code = V4L2_MBUS_FMT_VYUY8_2X8,
+	.fmt = {
 		.fourcc			= V4L2_PIX_FMT_VYUY,
 		.name			= "VYUY",
 		.bits_per_sample	= 8,
 		.packing		= SOC_MBUS_PACKING_2X8_PADHI,
 		.order			= SOC_MBUS_ORDER_LE,
 	},
-	[MBUS_IDX(RGB555_2X8_PADHI_LE)] = {
+}, {
+	.code = V4L2_MBUS_FMT_RGB555_2X8_PADHI_LE,
+	.fmt = {
 		.fourcc			= V4L2_PIX_FMT_RGB555,
 		.name			= "RGB555",
 		.bits_per_sample	= 8,
 		.packing		= SOC_MBUS_PACKING_2X8_PADHI,
 		.order			= SOC_MBUS_ORDER_LE,
 	},
-	[MBUS_IDX(RGB555_2X8_PADHI_BE)] = {
+}, {
+	.code = V4L2_MBUS_FMT_RGB555_2X8_PADHI_BE,
+	.fmt = {
 		.fourcc			= V4L2_PIX_FMT_RGB555X,
 		.name			= "RGB555X",
 		.bits_per_sample	= 8,
 		.packing		= SOC_MBUS_PACKING_2X8_PADHI,
 		.order			= SOC_MBUS_ORDER_LE,
 	},
-	[MBUS_IDX(RGB565_2X8_LE)] = {
+}, {
+	.code = V4L2_MBUS_FMT_RGB565_2X8_LE,
+	.fmt = {
 		.fourcc			= V4L2_PIX_FMT_RGB565,
 		.name			= "RGB565",
 		.bits_per_sample	= 8,
 		.packing		= SOC_MBUS_PACKING_2X8_PADHI,
 		.order			= SOC_MBUS_ORDER_LE,
 	},
-	[MBUS_IDX(RGB565_2X8_BE)] = {
+}, {
+	.code = V4L2_MBUS_FMT_RGB565_2X8_BE,
+	.fmt = {
 		.fourcc			= V4L2_PIX_FMT_RGB565X,
 		.name			= "RGB565X",
 		.bits_per_sample	= 8,
 		.packing		= SOC_MBUS_PACKING_2X8_PADHI,
 		.order			= SOC_MBUS_ORDER_LE,
 	},
-	[MBUS_IDX(SBGGR8_1X8)] = {
+}, {
+	.code = V4L2_MBUS_FMT_SBGGR8_1X8,
+	.fmt = {
 		.fourcc			= V4L2_PIX_FMT_SBGGR8,
 		.name			= "Bayer 8 BGGR",
 		.bits_per_sample	= 8,
 		.packing		= SOC_MBUS_PACKING_NONE,
 		.order			= SOC_MBUS_ORDER_LE,
 	},
-	[MBUS_IDX(SBGGR10_1X10)] = {
+}, {
+	.code = V4L2_MBUS_FMT_SBGGR10_1X10,
+	.fmt = {
 		.fourcc			= V4L2_PIX_FMT_SBGGR10,
 		.name			= "Bayer 10 BGGR",
 		.bits_per_sample	= 10,
 		.packing		= SOC_MBUS_PACKING_EXTEND16,
 		.order			= SOC_MBUS_ORDER_LE,
 	},
-	[MBUS_IDX(Y8_1X8)] = {
+}, {
+	.code = V4L2_MBUS_FMT_Y8_1X8,
+	.fmt = {
 		.fourcc			= V4L2_PIX_FMT_GREY,
 		.name			= "Grey",
 		.bits_per_sample	= 8,
 		.packing		= SOC_MBUS_PACKING_NONE,
 		.order			= SOC_MBUS_ORDER_LE,
 	},
-	[MBUS_IDX(Y10_1X10)] = {
+}, {
+	.code = V4L2_MBUS_FMT_Y10_1X10,
+	.fmt = {
 		.fourcc			= V4L2_PIX_FMT_Y10,
 		.name			= "Grey 10bit",
 		.bits_per_sample	= 10,
 		.packing		= SOC_MBUS_PACKING_EXTEND16,
 		.order			= SOC_MBUS_ORDER_LE,
 	},
-	[MBUS_IDX(SBGGR10_2X8_PADHI_LE)] = {
+}, {
+	.code = V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_LE,
+	.fmt = {
 		.fourcc			= V4L2_PIX_FMT_SBGGR10,
 		.name			= "Bayer 10 BGGR",
 		.bits_per_sample	= 8,
 		.packing		= SOC_MBUS_PACKING_2X8_PADHI,
 		.order			= SOC_MBUS_ORDER_LE,
 	},
-	[MBUS_IDX(SBGGR10_2X8_PADLO_LE)] = {
+}, {
+	.code = V4L2_MBUS_FMT_SBGGR10_2X8_PADLO_LE,
+	.fmt = {
 		.fourcc			= V4L2_PIX_FMT_SBGGR10,
 		.name			= "Bayer 10 BGGR",
 		.bits_per_sample	= 8,
 		.packing		= SOC_MBUS_PACKING_2X8_PADLO,
 		.order			= SOC_MBUS_ORDER_LE,
 	},
-	[MBUS_IDX(SBGGR10_2X8_PADHI_BE)] = {
+}, {
+	.code = V4L2_MBUS_FMT_SBGGR10_2X8_PADHI_BE,
+	.fmt = {
 		.fourcc			= V4L2_PIX_FMT_SBGGR10,
 		.name			= "Bayer 10 BGGR",
 		.bits_per_sample	= 8,
 		.packing		= SOC_MBUS_PACKING_2X8_PADHI,
 		.order			= SOC_MBUS_ORDER_BE,
 	},
-	[MBUS_IDX(SBGGR10_2X8_PADLO_BE)] = {
+}, {
+	.code = V4L2_MBUS_FMT_SBGGR10_2X8_PADLO_BE,
+	.fmt = {
 		.fourcc			= V4L2_PIX_FMT_SBGGR10,
 		.name			= "Bayer 10 BGGR",
 		.bits_per_sample	= 8,
 		.packing		= SOC_MBUS_PACKING_2X8_PADLO,
 		.order			= SOC_MBUS_ORDER_BE,
 	},
-	[MBUS_IDX(JPEG_1X8)] = {
+}, {
+	.code = V4L2_MBUS_FMT_JPEG_1X8,
+	.fmt = {
 		.fourcc                 = V4L2_PIX_FMT_JPEG,
 		.name                   = "JPEG",
 		.bits_per_sample        = 8,
 		.packing                = SOC_MBUS_PACKING_VARIABLE,
 		.order                  = SOC_MBUS_ORDER_LE,
 	},
+},
 };
 
 int soc_mbus_samples_per_pixel(const struct soc_mbus_pixelfmt *mf)
@@ -171,13 +204,25 @@ s32 soc_mbus_bytes_per_line(u32 width, const struct soc_mbus_pixelfmt *mf)
 }
 EXPORT_SYMBOL(soc_mbus_bytes_per_line);
 
+const struct soc_mbus_pixelfmt *soc_mbus_find_fmtdesc(
+	enum v4l2_mbus_pixelcode code,
+	const struct soc_mbus_lookup *lookup,
+	int n)
+{
+	int i;
+
+	for (i = 0; i < n; i++)
+		if (lookup[i].code == code)
+			return &lookup[i].fmt;
+
+	return NULL;
+}
+EXPORT_SYMBOL(soc_mbus_find_fmtdesc);
+
 const struct soc_mbus_pixelfmt *soc_mbus_get_fmtdesc(
 	enum v4l2_mbus_pixelcode code)
 {
-	if (code - V4L2_MBUS_FMT_FIXED > ARRAY_SIZE(mbus_fmt) ||
-	    code <= V4L2_MBUS_FMT_FIXED)
-		return NULL;
-	return mbus_fmt + code - V4L2_MBUS_FMT_FIXED - 1;
+	return soc_mbus_find_fmtdesc(code, mbus_fmt, ARRAY_SIZE(mbus_fmt));
 }
 EXPORT_SYMBOL(soc_mbus_get_fmtdesc);
 

include/media/soc_mediabus.h

@@ -58,6 +58,20 @@ struct soc_mbus_pixelfmt {
 	u8			bits_per_sample;
 };
 
+/**
+ * struct soc_mbus_lookup - Lookup FOURCC IDs by mediabus codes for pass-through
+ * @code:	mediabus pixel-code
+ * @fmt:	pixel format description
+ */
+struct soc_mbus_lookup {
+	enum v4l2_mbus_pixelcode	code;
+	struct soc_mbus_pixelfmt	fmt;
+};
+
+const struct soc_mbus_pixelfmt *soc_mbus_find_fmtdesc(
+	enum v4l2_mbus_pixelcode code,
+	const struct soc_mbus_lookup *lookup,
+	int n);
 const struct soc_mbus_pixelfmt *soc_mbus_get_fmtdesc(
 	enum v4l2_mbus_pixelcode code);
 s32 soc_mbus_bytes_per_line(u32 width, const struct soc_mbus_pixelfmt *mf);