Messages in this thread Patch in this message | | | From | Mark Brown <> | Subject | [PATCH 3/4] regmap: Add SPI bus support | Date | Mon, 18 Jul 2011 19:07:42 +0900 |
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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, ®map_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
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