linux-kernel - [RFC PATCH v2 5/5] Add parser for X

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Date:   Wed, 22 Dec 2021 18:43:40 +0000
From:   linuxkernel@...utosys.co.uk
To:     linux-kernel@...r.kernel.org
Cc:     broonie@...nel.org
Subject: [RFC PATCH v2 5/5] Add parser for X_9 formats

From: Christopher Tyerman <c.tyerman@...ebladeautomationsystems.co.uk>

added 9 bit Parser functions

these operate in same way as 16 bit parsers but mask out higher bits

regmap_parse_9_be()
regmap_parse_9_be_inplace()
regmap_parse_9_le()
regmap_parse_9_le_inplace()
regmap_parse_9_native()

	modified:   drivers/base/regmap/regmap.c

Signed-off-by: Christopher Tyerman <c.tyerman@...ebladeautomationsystems.co.uk>
---
 drivers/base/regmap/regmap.c | 53 ++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 177f2010a490..40579975209a 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -370,6 +370,39 @@ static unsigned int regmap_parse_8(const void *buf)
 	return b[0];
 }
 
+static unsigned int regmap_parse_9_be(const void *buf)
+{
+	return get_unaligned_be16(buf) & 0x1FF;
+}
+
+static unsigned int regmap_parse_9_le(const void *buf)
+{
+
+	return get_unaligned_le16(buf) & 0x1FF;
+}
+
+static void regmap_parse_9_be_inplace(void *buf)
+{
+	u16 v = get_unaligned_be16(buf) & 0x1FF;
+
+	memcpy(buf, &v, sizeof(v));
+}
+
+static void regmap_parse_9_le_inplace(void *buf)
+{
+	u16 v = get_unaligned_le16(buf) & 0x1FF;
+
+	memcpy(buf, &v, sizeof(v));
+}
+
+static unsigned int regmap_parse_9_native(const void *buf)
+{
+	u16 v;
+
+	memcpy(&v, buf, sizeof(v));
+	return v & 0x1FF;
+}
+
 static unsigned int regmap_parse_16_be(const void *buf)
 {
 	return get_unaligned_be16(buf);
@@ -1052,6 +1085,26 @@ struct regmap *__regmap_init(struct device *dev,
 		map->format.parse_val = regmap_parse_8;
 		map->format.parse_inplace = regmap_parse_inplace_noop;
 		break;
+	case 9:
+		switch (val_endian) {
+		case REGMAP_ENDIAN_BIG:
+			//map->format.format_val = regmap_format_9_be;
+			map->format.parse_val = regmap_parse_9_be;
+			map->format.parse_inplace = regmap_parse_9_be_inplace;
+			break;
+		case REGMAP_ENDIAN_LITTLE:
+			//map->format.format_val = regmap_format_9_le;
+			map->format.parse_val = regmap_parse_9_le;
+			map->format.parse_inplace = regmap_parse_9_le_inplace;
+			break;
+		case REGMAP_ENDIAN_NATIVE:
+			//map->format.format_val = regmap_format_9_native;
+			map->format.parse_val = regmap_parse_9_native;
+			break;
+		default:
+			goto err_hwlock;
+		}
+		break;
 	case 16:
 		switch (val_endian) {
 		case REGMAP_ENDIAN_BIG:
-- 
2.25.1