From 7d6f7fb053ad543da74119df3c4cd7bb46220471 Mon Sep 17 00:00:00 2001 From: Srinivas Kandagatla Date: Mon, 11 Dec 2017 23:43:02 +0000 Subject: regmap: add SLIMbus support This patch adds support to read/write SLIMbus value elements. Currently it only supports byte read/write. Adding this support in regmap would give codec drivers more flexibility when there are more than 2 control interfaces like SLIMbus, i2c. Without this patch each codec driver has to directly call SLIMbus value element apis, and this could would get messy once we want to add i2c interface to it. Signed-off-by: Srinivas Kandagatla Reviwed-by: Mark Brown Signed-off-by: Greg Kroah-Hartman --- drivers/base/regmap/Kconfig | 4 ++ drivers/base/regmap/Makefile | 1 + drivers/base/regmap/regmap-slimbus.c | 80 ++++++++++++++++++++++++++++++++++++ 3 files changed, 85 insertions(+) create mode 100644 drivers/base/regmap/regmap-slimbus.c (limited to 'drivers/base') diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig index 3a1535d812d8..cc162b48c6d7 100644 --- a/drivers/base/regmap/Kconfig +++ b/drivers/base/regmap/Kconfig @@ -21,6 +21,10 @@ config REGMAP_I2C tristate depends on I2C +config REGMAP_SLIMBUS + tristate + depends on SLIMBUS + config REGMAP_SPI tristate depends on SPI diff --git a/drivers/base/regmap/Makefile b/drivers/base/regmap/Makefile index 0d298c446108..63dec9222892 100644 --- a/drivers/base/regmap/Makefile +++ b/drivers/base/regmap/Makefile @@ -8,6 +8,7 @@ obj-$(CONFIG_REGCACHE_COMPRESSED) += regcache-lzo.o obj-$(CONFIG_DEBUG_FS) += regmap-debugfs.o obj-$(CONFIG_REGMAP_AC97) += regmap-ac97.o obj-$(CONFIG_REGMAP_I2C) += regmap-i2c.o +obj-$(CONFIG_REGMAP_SLIMBUS) += regmap-slimbus.o obj-$(CONFIG_REGMAP_SPI) += regmap-spi.o obj-$(CONFIG_REGMAP_SPMI) += regmap-spmi.o obj-$(CONFIG_REGMAP_MMIO) += regmap-mmio.o diff --git a/drivers/base/regmap/regmap-slimbus.c b/drivers/base/regmap/regmap-slimbus.c new file mode 100644 index 000000000000..c90bee81d954 --- /dev/null +++ b/drivers/base/regmap/regmap-slimbus.c @@ -0,0 +1,80 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2017, Linaro Ltd. + +#include +#include +#include + +#include "internal.h" + +static int regmap_slimbus_byte_reg_read(void *context, unsigned int reg, + unsigned int *val) +{ + struct slim_device *sdev = context; + int v; + + v = slim_readb(sdev, reg); + + if (v < 0) + return v; + + *val = v; + + return 0; +} + +static int regmap_slimbus_byte_reg_write(void *context, unsigned int reg, + unsigned int val) +{ + struct slim_device *sdev = context; + + return slim_writeb(sdev, reg, val); +} + +static struct regmap_bus regmap_slimbus_bus = { + .reg_write = regmap_slimbus_byte_reg_write, + .reg_read = regmap_slimbus_byte_reg_read, + .reg_format_endian_default = REGMAP_ENDIAN_LITTLE, + .val_format_endian_default = REGMAP_ENDIAN_LITTLE, +}; + +static const struct regmap_bus *regmap_get_slimbus(struct slim_device *slim, + const struct regmap_config *config) +{ + if (config->val_bits == 8 && config->reg_bits == 8) + return ®map_slimbus_bus; + + return ERR_PTR(-ENOTSUPP); +} + +struct regmap *__regmap_init_slimbus(struct slim_device *slimbus, + const struct regmap_config *config, + struct lock_class_key *lock_key, + const char *lock_name) +{ + const struct regmap_bus *bus = regmap_get_slimbus(slimbus, config); + + if (IS_ERR(bus)) + return ERR_CAST(bus); + + return __regmap_init(&slimbus->dev, bus, &slimbus->dev, config, + lock_key, lock_name); +} +EXPORT_SYMBOL_GPL(__regmap_init_slimbus); + +struct regmap *__devm_regmap_init_slimbus(struct slim_device *slimbus, + const struct regmap_config *config, + struct lock_class_key *lock_key, + const char *lock_name) +{ + const struct regmap_bus *bus = regmap_get_slimbus(slimbus, config); + + if (IS_ERR(bus)) + return ERR_CAST(bus); + + return __devm_regmap_init(&slimbus->dev, bus, &slimbus, config, + lock_key, lock_name); +} +EXPORT_SYMBOL_GPL(__devm_regmap_init_slimbus); + +MODULE_LICENSE("GPL v2"); -- cgit v1.2.3