95856d1f3c
SoundWire code as it is only supports Bulk register writes and
it does not support multi-register writes.
Any drivers that set can_multi_write and use regmap_multi_reg_write() will
easily endup with programming the hardware incorrectly without any errors.
So, add this check in bus code to be able to validate the drivers config.
Fixes: 522272047d ("regmap: sdw: Remove 8-bit value size restriction")
Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Link: https://lore.kernel.org/r/20230523154747.5429-1-srinivas.kandagatla@linaro.org
Signed-off-by: Mark Brown <broonie@kernel.org>
103 lines
2.7 KiB
C
103 lines
2.7 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/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/types.h>
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#include "internal.h"
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static int regmap_sdw_write(void *context, const void *val_buf, size_t val_size)
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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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/* First word of buffer contains the destination address */
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u32 addr = le32_to_cpu(*(const __le32 *)val_buf);
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const u8 *val = val_buf;
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return sdw_nwrite_no_pm(slave, addr, val_size - sizeof(addr), val + sizeof(addr));
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}
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static int regmap_sdw_gather_write(void *context,
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const void *reg_buf, size_t reg_size,
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const void *val_buf, size_t val_size)
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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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u32 addr = le32_to_cpu(*(const __le32 *)reg_buf);
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return sdw_nwrite_no_pm(slave, addr, val_size, val_buf);
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}
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static int regmap_sdw_read(void *context,
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const void *reg_buf, size_t reg_size,
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void *val_buf, size_t val_size)
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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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u32 addr = le32_to_cpu(*(const __le32 *)reg_buf);
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return sdw_nread_no_pm(slave, addr, val_size, val_buf);
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}
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static const struct regmap_bus regmap_sdw = {
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.write = regmap_sdw_write,
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.gather_write = regmap_sdw_gather_write,
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.read = regmap_sdw_read,
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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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/* Register addresses 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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/* Only bulk writes are supported not multi-register writes */
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if (config->can_multi_write)
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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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