linux/drivers/base/regmap/regmap-sdw.c
Vinod Koul 7c22ce6e21
regmap: Add SoundWire bus support
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>
Reviewed-by: Philippe Ombredanne <pombredanne@nexb.com>
Acked-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com>
Reviewed-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
2018-01-08 11:27:18 +00:00

89 lines
2.0 KiB
C

// 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, &regmap_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, &regmap_sdw,
&sdw->dev, config, lock_key, lock_name);
}
EXPORT_SYMBOL_GPL(__devm_regmap_init_sdw);
MODULE_DESCRIPTION("Regmap SoundWire Module");
MODULE_LICENSE("GPL v2");