diff options
| -rw-r--r-- | include/sound/sdca_regmap.h | 21 | ||||
| -rw-r--r-- | sound/soc/sdca/Makefile | 2 | ||||
| -rw-r--r-- | sound/soc/sdca/sdca_regmap.c | 192 |
3 files changed, 214 insertions, 1 deletions
diff --git a/include/sound/sdca_regmap.h b/include/sound/sdca_regmap.h new file mode 100644 index 000000000000..11826f4f0726 --- /dev/null +++ b/include/sound/sdca_regmap.h @@ -0,0 +1,21 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * The MIPI SDCA specification is available for public downloads at + * https://www.mipi.org/mipi-sdca-v1-0-download + * + * Copyright (C) 2025 Cirrus Logic, Inc. and + * Cirrus Logic International Semiconductor Ltd. + */ + +#ifndef __SDCA_REGMAP_H__ +#define __SDCA_REGMAP_H__ + +struct sdca_function_data; + +bool sdca_regmap_readable(struct sdca_function_data *function, unsigned int reg); +bool sdca_regmap_writeable(struct sdca_function_data *function, unsigned int reg); +bool sdca_regmap_volatile(struct sdca_function_data *function, unsigned int reg); +bool sdca_regmap_deferrable(struct sdca_function_data *function, unsigned int reg); +int sdca_regmap_mbq_size(struct sdca_function_data *function, unsigned int reg); + +#endif // __SDCA_REGMAP_H__ diff --git a/sound/soc/sdca/Makefile b/sound/soc/sdca/Makefile index 5d1ddbbfbf62..dddc3e694256 100644 --- a/sound/soc/sdca/Makefile +++ b/sound/soc/sdca/Makefile @@ -1,5 +1,5 @@ # SPDX-License-Identifier: GPL-2.0-only -snd-soc-sdca-y := sdca_functions.o sdca_device.o +snd-soc-sdca-y := sdca_functions.o sdca_device.o sdca_regmap.o obj-$(CONFIG_SND_SOC_SDCA) += snd-soc-sdca.o diff --git a/sound/soc/sdca/sdca_regmap.c b/sound/soc/sdca/sdca_regmap.c new file mode 100644 index 000000000000..ae6358f0fc26 --- /dev/null +++ b/sound/soc/sdca/sdca_regmap.c @@ -0,0 +1,192 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (C) 2025 Cirrus Logic, Inc. and +// Cirrus Logic International Semiconductor Ltd. + +/* + * The MIPI SDCA specification is available for public downloads at + * https://www.mipi.org/mipi-sdca-v1-0-download + */ + +#include <linux/bitops.h> +#include <linux/minmax.h> +#include <linux/module.h> +#include <linux/soundwire/sdw_registers.h> +#include <linux/types.h> +#include <sound/sdca_function.h> +#include <sound/sdca_regmap.h> + +static struct sdca_entity * +function_find_entity(struct sdca_function_data *function, unsigned int reg) +{ + int i; + + for (i = 0; i < function->num_entities; i++) + if (SDW_SDCA_CTL_ENT(reg) == function->entities[i].id) + return &function->entities[i]; + + return NULL; +} + +static struct sdca_control * +entity_find_control(struct sdca_entity *entity, unsigned int reg) +{ + int i; + + for (i = 0; i < entity->num_controls; i++) { + if (SDW_SDCA_CTL_CSEL(reg) == entity->controls[i].sel) + return &entity->controls[i]; + } + + return NULL; +} + +static struct sdca_control * +function_find_control(struct sdca_function_data *function, unsigned int reg) +{ + struct sdca_entity *entity; + + entity = function_find_entity(function, reg); + if (!entity) + return NULL; + + return entity_find_control(entity, reg); +} + +/** + * sdca_regmap_readable - return if a given SDCA Control is readable + * @function: Pointer to the Function information. + * @reg: Register address/Control to be processed. + * + * Return: Returns true if the register is readable. + */ +bool sdca_regmap_readable(struct sdca_function_data *function, unsigned int reg) +{ + struct sdca_control *control; + + if (!SDW_SDCA_VALID_CTL(reg)) + return false; + + control = function_find_control(function, reg); + if (!control) + return false; + + switch (control->mode) { + case SDCA_ACCESS_MODE_RW: + case SDCA_ACCESS_MODE_RO: + case SDCA_ACCESS_MODE_DUAL: + case SDCA_ACCESS_MODE_RW1S: + case SDCA_ACCESS_MODE_RW1C: + /* No access to registers marked solely for device use */ + return control->layers & ~SDCA_ACCESS_LAYER_DEVICE; + default: + return false; + } +} +EXPORT_SYMBOL_NS(sdca_regmap_readable, "SND_SOC_SDCA"); + +/** + * sdca_regmap_writeable - return if a given SDCA Control is writeable + * @function: Pointer to the Function information. + * @reg: Register address/Control to be processed. + * + * Return: Returns true if the register is writeable. + */ +bool sdca_regmap_writeable(struct sdca_function_data *function, unsigned int reg) +{ + struct sdca_control *control; + + if (!SDW_SDCA_VALID_CTL(reg)) + return false; + + control = function_find_control(function, reg); + if (!control) + return false; + + switch (control->mode) { + case SDCA_ACCESS_MODE_RW: + case SDCA_ACCESS_MODE_DUAL: + case SDCA_ACCESS_MODE_RW1S: + case SDCA_ACCESS_MODE_RW1C: + /* No access to registers marked solely for device use */ + return control->layers & ~SDCA_ACCESS_LAYER_DEVICE; + default: + return false; + } +} +EXPORT_SYMBOL_NS(sdca_regmap_writeable, "SND_SOC_SDCA"); + +/** + * sdca_regmap_volatile - return if a given SDCA Control is volatile + * @function: Pointer to the Function information. + * @reg: Register address/Control to be processed. + * + * Return: Returns true if the register is volatile. + */ +bool sdca_regmap_volatile(struct sdca_function_data *function, unsigned int reg) +{ + struct sdca_control *control; + + if (!SDW_SDCA_VALID_CTL(reg)) + return false; + + control = function_find_control(function, reg); + if (!control) + return false; + + switch (control->mode) { + case SDCA_ACCESS_MODE_RO: + case SDCA_ACCESS_MODE_RW1S: + case SDCA_ACCESS_MODE_RW1C: + return true; + default: + return false; + } +} +EXPORT_SYMBOL_NS(sdca_regmap_volatile, "SND_SOC_SDCA"); + +/** + * sdca_regmap_deferrable - return if a given SDCA Control is deferrable + * @function: Pointer to the Function information. + * @reg: Register address/Control to be processed. + * + * Return: Returns true if the register is deferrable. + */ +bool sdca_regmap_deferrable(struct sdca_function_data *function, unsigned int reg) +{ + struct sdca_control *control; + + if (!SDW_SDCA_VALID_CTL(reg)) + return false; + + control = function_find_control(function, reg); + if (!control) + return false; + + return control->deferrable; +} +EXPORT_SYMBOL_NS(sdca_regmap_deferrable, "SND_SOC_SDCA"); + +/** + * sdca_regmap_mbq_size - return size in bytes of a given SDCA Control + * @function: Pointer to the Function information. + * @reg: Register address/Control to be processed. + * + * Return: Returns the size in bytes of the Control. + */ +int sdca_regmap_mbq_size(struct sdca_function_data *function, unsigned int reg) +{ + struct sdca_control *control; + + if (!SDW_SDCA_VALID_CTL(reg)) + return -EINVAL; + + control = function_find_control(function, reg); + if (!control) + return false; + + return clamp_val(control->nbits / BITS_PER_BYTE, sizeof(u8), sizeof(u32)); +} +EXPORT_SYMBOL_NS(sdca_regmap_mbq_size, "SND_SOC_SDCA"); + +MODULE_LICENSE("GPL"); +MODULE_DESCRIPTION("SDCA library"); |