linux-kernel - [PATCH 1/4] regmap: add regmap_field_update

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Date:	Thu, 29 Aug 2013 21:33:01 -0700 (PDT)
From:	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
To:	Mark Brown <broonie@...nel.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:	Linux-ALSA <alsa-devel@...a-project.org>,
	Liam Girdwood <lgirdwood@...il.com>,
	Kuninori Morimoto <kuninori.morimoto.gx@...il.com>,
	Simon <horms@...ge.net.au>, linux-kernel@...r.kernel.org
Subject: [PATCH 1/4] regmap: add regmap_field_update_bits()

Current regmap_field is supporting read/write functions.
This patch adds new update_bits function for it.

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
---
 drivers/base/regmap/regmap.c |   20 ++++++++++++++++++++
 include/linux/regmap.h       |    2 ++
 2 files changed, 22 insertions(+)

diff --git a/drivers/base/regmap/regmap.c b/drivers/base/regmap/regmap.c
index e0d0c7d..7ae90d8 100644
--- a/drivers/base/regmap/regmap.c
+++ b/drivers/base/regmap/regmap.c
@@ -1360,6 +1360,26 @@ int regmap_field_write(struct regmap_field *field, unsigned int val)
 }
 EXPORT_SYMBOL_GPL(regmap_field_write);
 
+/**
+ * regmap_field_update_bits():	Perform a read/modify/write cycle
+ *                              on the register field
+ *
+ * @field: Register field to write to
+ * @mask: Bitmask to change
+ * @val: Value to be written
+ *
+ * A value of zero will be returned on success, a negative errno will
+ * be returned in error cases.
+ */
+int regmap_field_update_bits(struct regmap_field *field, unsigned int mask, unsigned int val)
+{
+	mask = (mask << field->shift) & field->mask;
+
+	return regmap_update_bits(field->regmap, field->reg,
+				  mask, val << field->shift);
+}
+EXPORT_SYMBOL_GPL(regmap_field_write);
+
 /*
  * regmap_bulk_write(): Write multiple registers to the device
  *
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index 75981d0..1425c91 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -446,6 +446,8 @@ void devm_regmap_field_free(struct device *dev,	struct regmap_field *field);
 
 int regmap_field_read(struct regmap_field *field, unsigned int *val);
 int regmap_field_write(struct regmap_field *field, unsigned int val);
+int regmap_field_update_bits(struct regmap_field *field,
+			     unsigned int mask, unsigned int val);
 
 /**
  * Description of an IRQ for the generic regmap irq_chip.
-- 
1.7.9.5

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