SoundWire bus provides sdw_read() and sdw_write() APIs for Slave devices to program the registers. Provide support in regmap for SoundWire bus.
Signed-off-by: Hardik T Shah hardik.t.shah@intel.com Signed-off-by: Sanyog Kale sanyog.r.kale@intel.com Signed-off-by: Vinod Koul vinod.koul@intel.com --- drivers/base/regmap/Kconfig | 4 ++ drivers/base/regmap/Makefile | 1 + drivers/base/regmap/regmap-sdw.c | 146 +++++++++++++++++++++++++++++++++++++++ drivers/soundwire/Kconfig | 1 + include/linux/regmap.h | 37 ++++++++++ 5 files changed, 189 insertions(+) create mode 100644 drivers/base/regmap/regmap-sdw.c
diff --git a/drivers/base/regmap/Kconfig b/drivers/base/regmap/Kconfig index 073c0b77e5b3..d0310fbaa8e7 100644 --- a/drivers/base/regmap/Kconfig +++ b/drivers/base/regmap/Kconfig @@ -36,3 +36,7 @@ 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 0cf4abc8fbf1..13004c979881 100644 --- a/drivers/base/regmap/Makefile +++ b/drivers/base/regmap/Makefile @@ -12,3 +12,4 @@ 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..37983d7c9ceb --- /dev/null +++ b/drivers/base/regmap/regmap-sdw.c @@ -0,0 +1,146 @@ +/* + * This file is provided under a dual BSD/GPLv2 license. When using or + * redistributing this file, you may do so under either license. + * + * GPL LICENSE SUMMARY + * + * Copyright(c) 2015-17 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of version 2 of the GNU General Public License as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * BSD LICENSE + * + * Copyright(c) 2015-17 Intel Corporation. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * * Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * * Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in + * the documentation and/or other materials provided with the + * distribution. + * * Neither the name of Intel Corporation nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS + * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT + * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR + * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT + * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, + * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT + * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE + * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + * + */ + +#include <linux/module.h> +#include <linux/regmap.h> +#include <linux/soundwire/sdw.h> +#include <linux/soundwire/sdw_registers.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); + + /* Check for Slave */ + if (!slave) + return 0; + + 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; + + /* Check for Slave */ + if (!slave) + return 0; + + 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; + + /* SoundWire register address are contiguous */ + if (config->reg_stride != 0) + 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(__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(__devm_regmap_init_sdw); + +MODULE_DESCRIPTION("Regmap SoundWire Module"); +MODULE_LICENSE("Dual BSD/GPL"); diff --git a/drivers/soundwire/Kconfig b/drivers/soundwire/Kconfig index 35792728c0aa..d63295015331 100644 --- a/drivers/soundwire/Kconfig +++ b/drivers/soundwire/Kconfig @@ -18,5 +18,6 @@ comment "SoundWire Devices" config SOUNDWIRE_BUS tristate default SOUNDWIRE + select REGMAP_SOUNDWIRE
endif diff --git a/include/linux/regmap.h b/include/linux/regmap.h index 978abfbac617..d5eecf2e9697 100644 --- a/include/linux/regmap.h +++ b/include/linux/regmap.h @@ -30,6 +30,7 @@ struct regmap; struct regmap_range_cfg; struct regmap_field; struct snd_ac97; +struct sdw_slave;
/* An enum of all the supported cache types */ enum regcache_type { @@ -474,6 +475,10 @@ struct regmap *__regmap_init_ac97(struct snd_ac97 *ac97, const struct regmap_config *config, struct lock_class_key *lock_key, const char *lock_name); +struct regmap *__regmap_init_sdw(struct sdw_slave *sdw, + const struct regmap_config *config, + struct lock_class_key *lock_key, + const char *lock_name);
struct regmap *__devm_regmap_init(struct device *dev, const struct regmap_bus *bus, @@ -511,6 +516,10 @@ struct regmap *__devm_regmap_init_ac97(struct snd_ac97 *ac97, const struct regmap_config *config, struct lock_class_key *lock_key, const char *lock_name); +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);
/* * Wrapper for regmap_init macros to include a unique lockdep key and name @@ -660,6 +669,20 @@ int regmap_attach_dev(struct device *dev, struct regmap *map, bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg);
/** + * regmap_init_sdw(): Initialise register map + * + * @sdw: 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. + */ +#define regmap_init_sdw(sdw, config) \ + __regmap_lockdep_wrapper(__regmap_init_sdw, #config, \ + sdw, config) + + +/** * devm_regmap_init() - Initialise managed register map * * @dev: Device that will be interacted with @@ -789,6 +812,20 @@ bool regmap_ac97_default_volatile(struct device *dev, unsigned int reg); __regmap_lockdep_wrapper(__devm_regmap_init_ac97, #config, \ ac97, config)
+/** + * devm_regmap_init_sdw(): Initialise managed register map + * + * @sdw: 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. The regmap will be automatically freed by the + * device management code. + */ +#define devm_regmap_init_sdw(sdw, config) \ + __regmap_lockdep_wrapper(__devm_regmap_init_sdw, #config, \ + sdw, config) + void regmap_exit(struct regmap *map); int regmap_reinit_cache(struct regmap *map, const struct regmap_config *config);