7c22ce6e21
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>
89 lines
2 KiB
C
89 lines
2 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, ®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");
|