1 files changed, 91 insertions, 0 deletions
diff --git a/drivers/media/platform/qcom/camss/camss-format.c b/drivers/media/platform/qcom/camss/camss-format.c
new file mode 100644
index 000000000000..4a3d5549615c
--- /dev/null
+++ b/drivers/media/platform/qcom/camss/camss-format.c
@@ -0,0 +1,91 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * camss-format.c
+ *
+ * Qualcomm MSM Camera Subsystem - Format helpers
+ *
+ * Copyright (c) 2023, The Linux Foundation. All rights reserved.
+ * Copyright (c) 2023 Qualcomm Technologies, Inc.
+ */
+#include <linux/bug.h>
+#include <linux/errno.h>
+
+#include "camss-format.h"
+
+/*
+ * camss_format_get_bpp - Map media bus format to bits per pixel
+ * @formats: supported media bus formats array
+ * @nformats: size of @formats array
+ * @code: media bus format code
+ *
+ * Return number of bits per pixel
+ */
+u8 camss_format_get_bpp(const struct camss_format_info *formats, unsigned int nformats, u32 code)
+{
+	unsigned int i;
+
+	for (i = 0; i < nformats; i++)
+		if (code == formats[i].code)
+			return formats[i].mbus_bpp;
+
+	WARN(1, "Unknown format\n");
+
+	return formats[0].mbus_bpp;
+}
+
+/*
+ * camss_format_find_code - Find a format code in an array
+ * @code: a pointer to media bus format codes array
+ * @n_code: size of @code array
+ * @index: index of code in the array
+ * @req_code: required code
+ *
+ * Return media bus format code
+ */
+u32 camss_format_find_code(u32 *code, unsigned int n_code, unsigned int index, u32 req_code)
+{
+	unsigned int i;
+
+	if (!req_code && index >= n_code)
+		return 0;
+
+	for (i = 0; i < n_code; i++) {
+		if (req_code) {
+			if (req_code == code[i])
+				return req_code;
+		} else {
+			if (i == index)
+				return code[i];
+		}
+	}
+
+	return code[0];
+}
+
+/*
+ * camss_format_find_format - Find a format in an array
+ * @code: media bus format code
+ * @pixelformat: V4L2 pixel format FCC identifier
+ * @formats: a pointer to formats array
+ * @nformats: size of @formats array
+ *
+ * Return index of a format or a negative error code otherwise
+ */
+int camss_format_find_format(u32 code, u32 pixelformat, const struct camss_format_info *formats,
+			     unsigned int nformats)
+{
+	unsigned int i;
+
+	for (i = 0; i < nformats; i++) {
+		if (formats[i].code == code &&
+		    formats[i].pixelformat == pixelformat)
+			return i;
+	}
+
+	for (i = 0; i < nformats; i++) {
+		if (formats[i].code == code)
+			return i;
+	}
+
+	return -EINVAL;
+}