diff options
Diffstat (limited to 'drivers')
-rw-r--r-- | drivers/base/regmap/Kconfig | 4 | ||||
-rw-r--r-- | drivers/base/regmap/Makefile | 1 | ||||
-rw-r--r-- | drivers/base/regmap/regmap-sdw.c | 88 |
3 files changed, 93 insertions, 0 deletions
diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig index 0368fd7b3a41..067073e4beb1 100644 --- a/drivers/base/regmap/Kconfig +++ b/drivers/base/regmap/Kconfig @@ -37,3 +37,7 @@ config REGMAP_MMIO config REGMAP_IRQ bool + +config REGMAP_SOUNDWIRE + tristate + depends on SOUNDWIRE_BUS diff --git a/drivers/base/regmap/Makefile b/drivers/base/regmap/Makefile index 0d298c446108..22d263cca395 100644 --- a/drivers/base/regmap/Makefile +++ b/drivers/base/regmap/Makefile @@ -13,3 +13,4 @@ obj-$(CONFIG_REGMAP_SPMI) += regmap-spmi.o obj-$(CONFIG_REGMAP_MMIO) += regmap-mmio.o obj-$(CONFIG_REGMAP_IRQ) += regmap-irq.o obj-$(CONFIG_REGMAP_W1) += regmap-w1.o +obj-$(CONFIG_REGMAP_SOUNDWIRE) += regmap-sdw.o diff --git a/drivers/base/regmap/regmap-sdw.c b/drivers/base/regmap/regmap-sdw.c new file mode 100644 index 000000000000..50a66382d87d --- /dev/null +++ b/drivers/base/regmap/regmap-sdw.c @@ -0,0 +1,88 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright(c) 2015-17 Intel Corporation. + +#include <linux/device.h> +#include <linux/mod_devicetable.h> +#include <linux/module.h> +#include <linux/soundwire/sdw.h> +#include "internal.h" + +static int regmap_sdw_write(void *context, unsigned int reg, unsigned int val) +{ + struct device *dev = context; + struct sdw_slave *slave = dev_to_sdw_dev(dev); + + return sdw_write(slave, reg, val); +} + +static int regmap_sdw_read(void *context, unsigned int reg, unsigned int *val) +{ + struct device *dev = context; + struct sdw_slave *slave = dev_to_sdw_dev(dev); + int read; + + read = sdw_read(slave, reg); + if (read < 0) + return read; + + *val = read; + return 0; +} + +static struct regmap_bus regmap_sdw = { + .reg_read = regmap_sdw_read, + .reg_write = regmap_sdw_write, + .reg_format_endian_default = REGMAP_ENDIAN_LITTLE, + .val_format_endian_default = REGMAP_ENDIAN_LITTLE, +}; + +static int regmap_sdw_config_check(const struct regmap_config *config) +{ + /* All register are 8-bits wide as per MIPI Soundwire 1.0 Spec */ + if (config->val_bits != 8) + return -ENOTSUPP; + + /* Registers are 32 bits wide */ + if (config->reg_bits != 32) + return -ENOTSUPP; + + if (config->pad_bits != 0) + return -ENOTSUPP; + + return 0; +} + +struct regmap *__regmap_init_sdw(struct sdw_slave *sdw, + const struct regmap_config *config, + struct lock_class_key *lock_key, + const char *lock_name) +{ + int ret; + + ret = regmap_sdw_config_check(config); + if (ret) + return ERR_PTR(ret); + + return __regmap_init(&sdw->dev, ®map_sdw, + &sdw->dev, config, lock_key, lock_name); +} +EXPORT_SYMBOL_GPL(__regmap_init_sdw); + +struct regmap *__devm_regmap_init_sdw(struct sdw_slave *sdw, + const struct regmap_config *config, + struct lock_class_key *lock_key, + const char *lock_name) +{ + int ret; + + ret = regmap_sdw_config_check(config); + if (ret) + return ERR_PTR(ret); + + return __devm_regmap_init(&sdw->dev, ®map_sdw, + &sdw->dev, config, lock_key, lock_name); +} +EXPORT_SYMBOL_GPL(__devm_regmap_init_sdw); + +MODULE_DESCRIPTION("Regmap SoundWire Module"); +MODULE_LICENSE("GPL v2"); |