diff options
Diffstat (limited to 'sound/hda')
| -rw-r--r-- | sound/hda/Kconfig | 5 | ||||
| -rw-r--r-- | sound/hda/Makefile | 3 | ||||
| -rw-r--r-- | sound/hda/intel-nhlt.c | 103 |
3 files changed, 111 insertions, 0 deletions
diff --git a/sound/hda/Kconfig b/sound/hda/Kconfig index f6feced15f17..9ccbcb5a06bd 100644 --- a/sound/hda/Kconfig +++ b/sound/hda/Kconfig @@ -29,3 +29,8 @@ config SND_HDA_PREALLOC_SIZE Note that the pre-allocation size can be changed dynamically via a proc file (/proc/asound/card*/pcm*/sub*/prealloc), too. + +config SND_INTEL_NHLT + tristate + # this config should be selected only for Intel ACPI platforms. + # A fallback is provided so that the code compiles in all cases.
\ No newline at end of file diff --git a/sound/hda/Makefile b/sound/hda/Makefile index 2160202e2dc1..8560f6ef1b19 100644 --- a/sound/hda/Makefile +++ b/sound/hda/Makefile @@ -13,3 +13,6 @@ obj-$(CONFIG_SND_HDA_CORE) += snd-hda-core.o #extended hda obj-$(CONFIG_SND_HDA_EXT_CORE) += ext/ + +snd-intel-nhlt-objs := intel-nhlt.o +obj-$(CONFIG_SND_INTEL_NHLT) += snd-intel-nhlt.o diff --git a/sound/hda/intel-nhlt.c b/sound/hda/intel-nhlt.c new file mode 100644 index 000000000000..7a62e03ba407 --- /dev/null +++ b/sound/hda/intel-nhlt.c @@ -0,0 +1,103 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2015-2019 Intel Corporation + +#include <linux/acpi.h> +#include <sound/intel-nhlt.h> + +#define NHLT_ACPI_HEADER_SIG "NHLT" + +/* Unique identification for getting NHLT blobs */ +static guid_t osc_guid = + GUID_INIT(0xA69F886E, 0x6CEB, 0x4594, + 0xA4, 0x1F, 0x7B, 0x5D, 0xCE, 0x24, 0xC5, 0x53); + +struct nhlt_acpi_table *intel_nhlt_init(struct device *dev) +{ + acpi_handle handle; + union acpi_object *obj; + struct nhlt_resource_desc *nhlt_ptr; + struct nhlt_acpi_table *nhlt_table = NULL; + + handle = ACPI_HANDLE(dev); + if (!handle) { + dev_err(dev, "Didn't find ACPI_HANDLE\n"); + return NULL; + } + + obj = acpi_evaluate_dsm(handle, &osc_guid, 1, 1, NULL); + + if (!obj) + return NULL; + + if (obj->type != ACPI_TYPE_BUFFER) { + dev_dbg(dev, "No NHLT table found\n"); + ACPI_FREE(obj); + return NULL; + } + + nhlt_ptr = (struct nhlt_resource_desc *)obj->buffer.pointer; + if (nhlt_ptr->length) + nhlt_table = (struct nhlt_acpi_table *) + memremap(nhlt_ptr->min_addr, nhlt_ptr->length, + MEMREMAP_WB); + ACPI_FREE(obj); + if (nhlt_table && + (strncmp(nhlt_table->header.signature, + NHLT_ACPI_HEADER_SIG, + strlen(NHLT_ACPI_HEADER_SIG)) != 0)) { + memunmap(nhlt_table); + dev_err(dev, "NHLT ACPI header signature incorrect\n"); + return NULL; + } + return nhlt_table; +} +EXPORT_SYMBOL_GPL(intel_nhlt_init); + +void intel_nhlt_free(struct nhlt_acpi_table *nhlt) +{ + memunmap((void *)nhlt); +} +EXPORT_SYMBOL_GPL(intel_nhlt_free); + +int intel_nhlt_get_dmic_geo(struct device *dev, struct nhlt_acpi_table *nhlt) +{ + struct nhlt_endpoint *epnt; + struct nhlt_dmic_array_config *cfg; + unsigned int dmic_geo = 0; + u8 j; + + if (!nhlt) + return 0; + + epnt = (struct nhlt_endpoint *)nhlt->desc; + + for (j = 0; j < nhlt->endpoint_count; j++) { + if (epnt->linktype == NHLT_LINK_DMIC) { + cfg = (struct nhlt_dmic_array_config *) + (epnt->config.caps); + switch (cfg->array_type) { + case NHLT_MIC_ARRAY_2CH_SMALL: + case NHLT_MIC_ARRAY_2CH_BIG: + dmic_geo = MIC_ARRAY_2CH; + break; + + case NHLT_MIC_ARRAY_4CH_1ST_GEOM: + case NHLT_MIC_ARRAY_4CH_L_SHAPED: + case NHLT_MIC_ARRAY_4CH_2ND_GEOM: + dmic_geo = MIC_ARRAY_4CH; + break; + + default: + dev_warn(dev, "undefined DMIC array_type 0x%0x\n", + cfg->array_type); + } + } + epnt = (struct nhlt_endpoint *)((u8 *)epnt + epnt->length); + } + + return dmic_geo; +} +EXPORT_SYMBOL_GPL(intel_nhlt_get_dmic_geo); + +MODULE_LICENSE("GPL v2"); +MODULE_DESCRIPTION("Intel NHLT driver"); |