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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
2.0 KiB
C
89 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright(c) 2015-17 Intel Corporation.
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#include <linux/device.h>
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#include <linux/mod_devicetable.h>
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#include <linux/module.h>
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#include <linux/soundwire/sdw.h>
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#include "internal.h"
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static int regmap_sdw_write(void *context, unsigned int reg, unsigned int val)
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{
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struct device *dev = context;
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struct sdw_slave *slave = dev_to_sdw_dev(dev);
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return sdw_write(slave, reg, val);
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}
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static int regmap_sdw_read(void *context, unsigned int reg, unsigned int *val)
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{
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struct device *dev = context;
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struct sdw_slave *slave = dev_to_sdw_dev(dev);
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int read;
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read = sdw_read(slave, reg);
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if (read < 0)
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return read;
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*val = read;
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return 0;
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}
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static struct regmap_bus regmap_sdw = {
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.reg_read = regmap_sdw_read,
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.reg_write = regmap_sdw_write,
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.reg_format_endian_default = REGMAP_ENDIAN_LITTLE,
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.val_format_endian_default = REGMAP_ENDIAN_LITTLE,
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};
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static int regmap_sdw_config_check(const struct regmap_config *config)
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{
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/* All register are 8-bits wide as per MIPI Soundwire 1.0 Spec */
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if (config->val_bits != 8)
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return -ENOTSUPP;
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/* Registers are 32 bits wide */
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if (config->reg_bits != 32)
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return -ENOTSUPP;
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if (config->pad_bits != 0)
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return -ENOTSUPP;
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return 0;
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}
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struct regmap *__regmap_init_sdw(struct sdw_slave *sdw,
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const struct regmap_config *config,
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struct lock_class_key *lock_key,
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const char *lock_name)
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{
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int ret;
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ret = regmap_sdw_config_check(config);
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if (ret)
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return ERR_PTR(ret);
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return __regmap_init(&sdw->dev, ®map_sdw,
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&sdw->dev, config, lock_key, lock_name);
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}
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EXPORT_SYMBOL_GPL(__regmap_init_sdw);
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struct regmap *__devm_regmap_init_sdw(struct sdw_slave *sdw,
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const struct regmap_config *config,
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struct lock_class_key *lock_key,
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const char *lock_name)
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{
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int ret;
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ret = regmap_sdw_config_check(config);
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if (ret)
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return ERR_PTR(ret);
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return __devm_regmap_init(&sdw->dev, ®map_sdw,
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&sdw->dev, config, lock_key, lock_name);
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}
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EXPORT_SYMBOL_GPL(__devm_regmap_init_sdw);
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MODULE_DESCRIPTION("Regmap SoundWire Module");
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MODULE_LICENSE("GPL v2");
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