linux-kernel - [PATCH v3 2/6] regmap: Add support for device with 24 data bits.

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Message-Id: <1331757790-10583-3-git-send-email-marc@cpdesign.com.au>
Date:	Thu, 15 Mar 2012 07:43:06 +1100
From:	Marc Reilly <marc@...esign.com.au>
To:	sameo@...ux.intel.com
Cc:	linux-arm-kernel@...ts.infradead.org,
	spi-devel-general@...ts.sourceforge.net, linux-i2c@...r.kernel.org,
	u.kleine-koenig@...gutronix.de, oskar@...ra.com,
	linux-kernel@...r.kernel.org, broonie@...nsource.wolfsonmicro.com,
	Marc Reilly <marc@...esign.com.au>
Subject: [PATCH v3 2/6] regmap: Add support for device with 24 data bits.

Add support for devices with 24 data bits.

Signed-off-by: Marc Reilly <marc@...esign.com.au>
---
 drivers/base/regmap/regmap.c |   23 +++++++++++++++++++++++
 1 files changed, 23 insertions(+), 0 deletions(-)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index 62ef0df..880e3a0 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -122,6 +122,15 @@ static void regmap_format_16(void *buf, unsigned int val)
 	b[0] = cpu_to_be16(val);
 }
 
+static void regmap_format_24(void *buf, unsigned int val)
+{
+	u8 *b = buf;
+
+	b[0] = val >> 16;
+	b[1] = val >> 8;
+	b[2] = val;
+}
+
 static unsigned int regmap_parse_8(void *buf)
 {
 	u8 *b = buf;
@@ -138,6 +147,16 @@ static unsigned int regmap_parse_16(void *buf)
 	return b[0];
 }
 
+static unsigned int regmap_parse_24(void *buf)
+{
+	u8 *b = buf;
+	unsigned int ret = b[2];
+	ret |= ((unsigned int)b[1]) << 8;
+	ret |= ((unsigned int)b[0]) << 16;
+
+	return ret;
+}
+
 /**
  * regmap_init(): Initialise register map
  *
@@ -240,6 +259,10 @@ struct regmap *regmap_init(struct device *dev,
 		map->format.format_val = regmap_format_16;
 		map->format.parse_val = regmap_parse_16;
 		break;
+	case 24:
+		map->format.format_val = regmap_format_24;
+		map->format.parse_val = regmap_parse_24;
+		break;
 	}
 
 	if (!map->format.format_write &&
-- 
1.7.3.4

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