102 lines
2.4 KiB
C
102 lines
2.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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// Copyright(c) 2020 Intel Corporation.
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/module.h>
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#include <linux/regmap.h>
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#include <linux/soundwire/sdw.h>
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#include <linux/soundwire/sdw_registers.h>
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#include "internal.h"
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static int regmap_sdw_mbq_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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int ret;
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ret = sdw_write_no_pm(slave, SDW_SDCA_MBQ_CTL(reg), (val >> 8) & 0xff);
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if (ret < 0)
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return ret;
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return sdw_write_no_pm(slave, reg, val & 0xff);
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}
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static int regmap_sdw_mbq_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 read0;
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int read1;
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read0 = sdw_read_no_pm(slave, reg);
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if (read0 < 0)
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return read0;
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read1 = sdw_read_no_pm(slave, SDW_SDCA_MBQ_CTL(reg));
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if (read1 < 0)
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return read1;
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*val = (read1 << 8) | read0;
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return 0;
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}
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static struct regmap_bus regmap_sdw_mbq = {
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.reg_read = regmap_sdw_mbq_read,
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.reg_write = regmap_sdw_mbq_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_mbq_config_check(const struct regmap_config *config)
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{
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/* MBQ-based controls are only 16-bits for now */
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if (config->val_bits != 16)
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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_mbq(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_mbq_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_mbq,
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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_mbq);
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struct regmap *__devm_regmap_init_sdw_mbq(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_mbq_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_mbq,
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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_mbq);
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MODULE_DESCRIPTION("Regmap SoundWire MBQ Module");
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MODULE_LICENSE("GPL");
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