[PATCH 3/4] regmap: Add SPI bus support

Mark Brown
2011-07-18T10:08:34Z

Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Acked-by: Liam Girdwood <lrg@ti.com>
Acked-by: Wolfram Sang <w.sang@pengutronix.de>
---
drivers/base/regmap/Kconfig | 4 ++
drivers/base/regmap/Makefile | 1 +
drivers/base/regmap/regmap-spi.c | 73 ++++++++++++++++++++++++++++++++++++++
include/linux/regmap.h | 3 ++
5 files changed, 82 insertions(+), 0 deletions(-)
create mode 100644 drivers/base/regmap/regmap-spi.c

diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig
index c374375..54b5854 100644
--- a/drivers/base/regmap/Kconfig
+++ b/drivers/base/regmap/Kconfig
@@ -8,3 +8,7 @@ config REGMAP
config REGMAP_I2C
tristate
default I2C
+
+config REGMAP_SPI
+ tristate
+ default SPI_MASTER
diff --git a/drivers/base/regmap/Makefile b/drivers/base/regmap/Makefile
index ee5109d..f476f45 100644
--- a/drivers/base/regmap/Makefile
+++ b/drivers/base/regmap/Makefile
@@ -1,2 +1,3 @@
obj-$(CONFIG_REGMAP) += regmap.o
obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o
+obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o
diff --git a/drivers/base/regmap/regmap-spi.c b/drivers/base/regmap/regmap-spi.c
new file mode 100644
index 0000000..b994218
--- /dev/null
+++ b/drivers/base/regmap/regmap-spi.c
@@ -0,0 +1,73 @@
+/*
+ * Register map access API - SPI support
+ *
+ * Copyright 2011 Wolfson Microelectronics plc
+ *
+ * Author: Mark Brown <broonie@opensource.wolfsonmicro.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include <linux/regmap.h>
+#include <linux/spi/spi.h>
+#include <linux/init.h>
+
+static int regmap_spi_write(struct device *dev, const void *data, size_t count)
+{
+ struct spi_device *spi = to_spi_device(dev);
+
+ return spi_write(spi, data, count);
+}
+
+static int regmap_spi_gather_write(struct device *dev,
+ const void *reg, size_t reg_len,
+ const void *val, size_t val_len)
+{
+ struct spi_device *spi = to_spi_device(dev);
+ struct spi_message m;
+ struct spi_transfer t[2] = { { .tx_buf = reg, .len = reg_len, },
+ { .tx_buf = val, .len = val_len, }, };
+
+ spi_message_init(&m);
+ spi_message_add_tail(&t[0], &m);
+ spi_message_add_tail(&t[1], &m);
+
+ return spi_sync(spi, &m);
+}
+
+static int regmap_spi_read(struct device *dev,
+ const void *reg, size_t reg_size,
+ void *val, size_t val_size)
+{
+ struct spi_device *spi = to_spi_device(dev);
+
+ return spi_write_then_read(spi, reg, reg_size, val, val_size);
+}
+
+static struct regmap_bus regmap_spi = {
+ .type = &spi_bus_type,
+ .write = regmap_spi_write,
+ .gather_write = regmap_spi_gather_write,
+ .read = regmap_spi_read,
+ .owner = THIS_MODULE,
+ .read_flag_mask = 0x80,
+};
+
+/**
+ * regmap_init_spi(): Initialise register map
+ *
+ * @dev: Device that will be interacted with
+ * @config: Configuration for register map
+ *
+ * The return value will be an ERR_PTR() on error or a valid pointer to
+ * a struct regmap.
+ */
+struct regmap *regmap_init_spi(struct device *dev,
+ const struct regmap_config *config)
+{
+ return regmap_init(dev, &regmap_spi, config);
+}
+EXPORT_SYMBOL_GPL(regmap_init_spi);
+
diff --git a/include/linux/regmap.h b/include/linux/regmap.h
index e509bac..c549632 100644
--- a/include/linux/regmap.h
+++ b/include/linux/regmap.h
@@ -61,6 +61,9 @@ struct regmap *regmap_init(struct device *dev,
const struct regmap_config *config);
struct regmap *regmap_init_i2c(struct device *dev,
const struct regmap_config *config);
+struct regmap *regmap_init_spi(struct device *dev,
+ const struct regmap_config *config);
+
void regmap_exit(struct regmap *map);
int regmap_write(struct regmap *map, unsigned int reg, unsigned int val);
int regmap_raw_write(struct regmap *map, unsigned int reg,
--
1.7.5.4