kpriv/linux-hardened
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity

regmap: Add SoundWire bus support

Browse source 
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>
This commit is contained in:
Vinod Koul 2018-01-08 15:50:59 +05:30 committed by Mark Brown
parent a4887813c3
commit 7c22ce6e21
No known key found for this signature in database
GPG key ID: 24D68B725D5487D0
4 changed files with 130 additions and 0 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
drivers/base/regmap/Kconfig
View file

@ -37,3 +37,7 @@ config REGMAP_MMIO
config REGMAP_IRQ
bool
config REGMAP_SOUNDWIRE
tristate
depends on SOUNDWIRE_BUS

1
drivers/base/regmap/Makefile
View file

@ -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

88
drivers/base/regmap/regmap-sdw.c Normal file
View file

@ -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, &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");

37
include/linux/regmap.h
View file

@ -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 {
@ -526,6 +527,10 @@ 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,
@ -563,6 +568,10 @@ 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
@ -711,6 +720,20 @@ int regmap_attach_dev(struct device *dev, struct regmap *map,
ac97, config)
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
*
@ -841,6 +864,20 @@ 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);