[SRU][OEM-OSP1-B][PATCH 2/6] ALSA: hda: move parts of NHLT code to new module

Hui Wang hui.wang at canonical.com
Thu Jul 25 03:49:48 UTC 2019


From: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>

BugLink: https://bugs.launchpad.net/bugs/1837828

Move parts of the code outside of the Skylake driver to help detect
the presence of DMICs (which are not supported by the HDaudio legacy
driver).

No functionality change (except for the removal of useless OR
operations), only indentation and checkpatch fixes, and making sure
that the code compiles without ACPI

Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
(backported from https://mailman.alsa-project.org/pipermail/alsa-devel/2019-July/152523.html)
Signed-off-by: Hui Wang <hui.wang at canonical.com>
---
 include/sound/intel-nhlt.h | 51 +++++++++++++-------
 sound/hda/Kconfig          |  5 ++
 sound/hda/Makefile         |  3 ++
 sound/hda/intel-nhlt.c     | 98 ++++++++++++++++++++++++++++++++++++++
 4 files changed, 139 insertions(+), 18 deletions(-)
 create mode 100644 sound/hda/intel-nhlt.c

diff --git a/include/sound/intel-nhlt.h b/include/sound/intel-nhlt.h
index 116534e7b3c5..59f19f172fda 100644
--- a/include/sound/intel-nhlt.h
+++ b/include/sound/intel-nhlt.h
@@ -1,27 +1,16 @@
 /*
- *  skl-nhlt.h - Intel HDA Platform NHLT header
- *
- *  Copyright (C) 2015 Intel Corp
- *  Author: Sanjiv Kumar <sanjiv.kumar at intel.com>
- *  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- *
- *  This program is free software; you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation; version 2 of the License.
- *
- *  This program is distributed in the hope that it will be useful, but
- *  WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- *  General Public License for more details.
- *
- * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+ *  intel-nhlt.h - Intel HDA Platform NHLT header
  *
+ *  Copyright (c) 2015-2019 Intel Corporation
  */
-#ifndef __SKL_NHLT_H__
-#define __SKL_NHLT_H__
+
+#ifndef __INTEL_NHLT_H__
+#define __INTEL_NHLT_H__
 
 #include <linux/acpi.h>
 
+#if IS_ENABLED(CONFIG_ACPI) && IS_ENABLED(CONFIG_SND_INTEL_NHLT)
+
 struct wav_fmt {
 	u16 fmt_tag;
 	u16 channels;
@@ -125,4 +114,30 @@ enum {
 	NHLT_MIC_ARRAY_VENDOR_DEFINED = 0xf,
 };
 
+struct nhlt_acpi_table *intel_nhlt_init(struct device *dev);
+
+void intel_nhlt_free(struct nhlt_acpi_table *addr);
+
+int intel_nhlt_get_dmic_geo(struct device *dev, struct nhlt_acpi_table *nhlt);
+
+#else
+
+struct nhlt_acpi_table;
+
+static inline struct nhlt_acpi_table *intel_nhlt_init(struct device *dev)
+{
+	return NULL;
+}
+
+static inline void intel_nhlt_free(struct nhlt_acpi_table *addr)
+{
+}
+
+static inline int intel_nhlt_get_dmic_geo(struct device *dev,
+					  struct nhlt_acpi_table *nhlt)
+{
+	return 0;
+}
+#endif
+
 #endif
diff --git a/sound/hda/Kconfig b/sound/hda/Kconfig
index 2d90e11b3eaa..c5fade666077 100644
--- a/sound/hda/Kconfig
+++ b/sound/hda/Kconfig
@@ -28,3 +28,8 @@ 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..7ba871e470f2
--- /dev/null
+++ b/sound/hda/intel-nhlt.c
@@ -0,0 +1,98 @@
+// 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 = NULL;
+	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 && obj->type == ACPI_TYPE_BUFFER) {
+		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;
+	}
+
+	dev_dbg(dev, "No NHLT table found\n");
+	return NULL;
+}
+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");
-- 
2.17.1




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