Allow for testing audio streaming over I2S interface through SSP-test
board. No actual codec is needed here as board is intended for SSP
loopback scenarios only. One playback and one capture endpoint is
exposed per SSP port.
Signed-off-by: Amadeusz Sławiński <amadeuszx.slawinski@xxxxxxxxxxxxxxx>
Signed-off-by: Cezary Rojewski <cezary.rojewski@xxxxxxxxx>
---
sound/soc/intel/avs/boards/Kconfig | 6 +
sound/soc/intel/avs/boards/Makefile | 2 +
sound/soc/intel/avs/boards/ssp_test.c | 178 ++++++++++++++++++++++++++
3 files changed, 186 insertions(+)
create mode 100644 sound/soc/intel/avs/boards/ssp_test.c
diff --git a/sound/soc/intel/avs/boards/Kconfig b/sound/soc/intel/avs/boards/Kconfig
index 1d4597fa9814..ea2f094758f9 100644
--- a/sound/soc/intel/avs/boards/Kconfig
+++ b/sound/soc/intel/avs/boards/Kconfig
@@ -20,4 +20,10 @@ config SND_SOC_INTEL_AVS_MACH_HDAUDIO
Say Y or m if you have such a device. This is a recommended option.
If unsure select "N".
+config SND_SOC_INTEL_AVS_MACH_SSP_TEST
+ tristate "SSP test board"
+ help
+ This adds support for SSP test board which can be used to verify
+ transfer over I2S interface with loopback scenarios.
+
endmenu
diff --git a/sound/soc/intel/avs/boards/Makefile b/sound/soc/intel/avs/boards/Makefile
index 2ff35d4d97d8..1c860ca165de 100644
--- a/sound/soc/intel/avs/boards/Makefile
+++ b/sound/soc/intel/avs/boards/Makefile
@@ -2,6 +2,8 @@
snd-soc-avs-dmic-objs := dmic.o
snd-soc-avs-hdaudio-objs := hdaudio.o
+snd-soc-avs-ssp-test-objs := ssp_test.o
obj-$(CONFIG_SND_SOC_INTEL_AVS_MACH_DMIC) += snd-soc-avs-dmic.o
obj-$(CONFIG_SND_SOC_INTEL_AVS_MACH_HDAUDIO) += snd-soc-avs-hdaudio.o
+obj-$(CONFIG_SND_SOC_INTEL_AVS_MACH_SSP_TEST) += snd-soc-avs-ssp-test.o
diff --git a/sound/soc/intel/avs/boards/ssp_test.c b/sound/soc/intel/avs/boards/ssp_test.c
new file mode 100644
index 000000000000..cabaf615b9ae
--- /dev/null
+++ b/sound/soc/intel/avs/boards/ssp_test.c
@@ -0,0 +1,178 @@
+// SPDX-License-Identifier: GPL-2.0-only
+//
+// Copyright(c) 2021-2022 Intel Corporation. All rights reserved.
+//
+// Authors: Cezary Rojewski <cezary.rojewski@xxxxxxxxx>
+// Amadeusz Slawinski <amadeuszx.slawinski@xxxxxxxxxxxxxxx>
+//
+
+#include <linux/module.h>
+#include <sound/pcm.h>
+#include <sound/pcm_params.h>
+#include <sound/soc.h>
+#include <sound/soc-acpi.h>
+#include <sound/soc-dapm.h>
+
+static int avs_create_dai_link(struct device *dev, const char *platform_name, int ssp_port,
+ struct snd_soc_dai_link **dai_link)
+{
+ struct snd_soc_dai_link_component *platform;
+ struct snd_soc_dai_link *dl;
+
+ dl = devm_kzalloc(dev, sizeof(*dl), GFP_KERNEL);
+ platform = devm_kzalloc(dev, sizeof(*platform), GFP_KERNEL);
+ if (!dl || !platform)
+ return -ENOMEM;
+
+ platform->name = platform_name;
+
+ dl->name = devm_kasprintf(dev, GFP_KERNEL, "SSP%d-Codec", ssp_port);
+ dl->cpus = devm_kzalloc(dev, sizeof(*dl->cpus), GFP_KERNEL);
+ dl->codecs = devm_kzalloc(dev, sizeof(*dl->codecs), GFP_KERNEL);
+ if (!dl->name || !dl->cpus || !dl->codecs)
+ return -ENOMEM;
+
+ dl->cpus->dai_name = devm_kasprintf(dev, GFP_KERNEL, "SSP%d Pin", ssp_port);
+ dl->codecs->name = devm_kasprintf(dev, GFP_KERNEL, "snd-soc-dummy");
+ dl->codecs->dai_name = devm_kasprintf(dev, GFP_KERNEL, "snd-soc-dummy-dai");
+ if (!dl->cpus->dai_name || !dl->codecs->name || !dl->codecs->dai_name)
+ return -ENOMEM;
+
+ dl->num_cpus = 1;
+ dl->num_codecs = 1;
+ dl->platforms = platform;
+ dl->num_platforms = 1;
+ dl->id = 0;
+ dl->nonatomic = 1;
+ dl->no_pcm = 1;
+ dl->dpcm_capture = 1;
+ dl->dpcm_playback = 1;
+
+ *dai_link = dl;
+
+ return 0;
+}
+
+static int avs_create_dapm_routes(struct device *dev, int ssp_port,
+ struct snd_soc_dapm_route **routes, int *num_routes)
+{
+ struct snd_soc_dapm_route *dr;
+ const int num_dr = 2;
+
+ dr = devm_kcalloc(dev, num_dr, sizeof(*dr), GFP_KERNEL);
+ if (!dr)
+ return -ENOMEM;
+
+ dr[0].sink = devm_kasprintf(dev, GFP_KERNEL, "ssp%dpb", ssp_port);
+ dr[0].source = devm_kasprintf(dev, GFP_KERNEL, "ssp%d Tx", ssp_port);
+ if (!dr[0].sink || !dr[0].source)
+ return -ENOMEM;
+
+ dr[1].sink = devm_kasprintf(dev, GFP_KERNEL, "ssp%d Rx", ssp_port);
+ dr[1].source = devm_kasprintf(dev, GFP_KERNEL, "ssp%dcp", ssp_port);
+ if (!dr[1].sink || !dr[1].source)
+ return -ENOMEM;
+
+ *routes = dr;
+ *num_routes = num_dr;
+
+ return 0;
+}
+
+static int avs_create_dapm_widgets(struct device *dev, int ssp_port,
+ struct snd_soc_dapm_widget **widgets, int *num_widgets)
+{
+ struct snd_soc_dapm_widget *dw;
+ const int num_dw = 2;
+
+ dw = devm_kcalloc(dev, num_dw, sizeof(*dw), GFP_KERNEL);
+ if (!dw)
+ return -ENOMEM;
+
+ dw[0].id = snd_soc_dapm_hp;
+ dw[0].reg = SND_SOC_NOPM;
+ dw[0].name = devm_kasprintf(dev, GFP_KERNEL, "ssp%dpb", ssp_port);
+ if (!dw[0].name)
+ return -ENOMEM;
+
+ dw[1].id = snd_soc_dapm_mic;
+ dw[1].reg = SND_SOC_NOPM;
+ dw[1].name = devm_kasprintf(dev, GFP_KERNEL, "ssp%dcp", ssp_port);
+ if (!dw[1].name)
+ return -ENOMEM;
+
+ *widgets = dw;
+ *num_widgets = num_dw;
+
+ return 0;
+}
+
+static int avs_ssp_test_probe(struct platform_device *pdev)
+{
+ struct snd_soc_dapm_widget *widgets;
+ struct snd_soc_dapm_route *routes;
+ struct snd_soc_dai_link *dai_link;
+ struct snd_soc_acpi_mach *mach;
+ struct snd_soc_card *card;
+ struct device *dev = &pdev->dev;
+ const char *pname;
+ int num_routes, num_widgets, ret;
+
+ mach = dev_get_platdata(dev);
+ pname = mach->mach_params.platform;
+
+ card = devm_kzalloc(dev, sizeof(*card), GFP_KERNEL);
+ if (!card)
+ return -ENOMEM;
+
+ card->name = devm_kasprintf(dev, GFP_KERNEL, "ssp%ld-loopback", __ffs(mach->link_mask));
+ if (!card->name)
+ return -ENOMEM;
+
+ ret = avs_create_dai_link(dev, pname, __ffs(mach->link_mask), &dai_link);
+ if (ret) {
+ dev_err(dev, "Failed to create dai link: %d\n", ret);
+ return ret;
+ }
+
+ ret = avs_create_dapm_routes(dev, __ffs(mach->link_mask), &routes, &num_routes);
+ if (ret) {
+ dev_err(dev, "Failed to create dapm routes: %d\n", ret);
+ return ret;
+ }
+
+ ret = avs_create_dapm_widgets(dev, __ffs(mach->link_mask), &widgets, &num_widgets);
+ if (ret) {
+ dev_err(dev, "Failed to create dapm widgets: %d\n", ret);
+ return ret;
+ }
+
+ card->dev = dev;
+ card->owner = THIS_MODULE;
+ card->dai_link = dai_link;
+ card->num_links = 1;
+ card->dapm_routes = routes;
+ card->num_dapm_routes = num_routes;
+ card->dapm_widgets = widgets;
+ card->num_dapm_widgets = num_widgets;
+ card->fully_routed = true;
+
+ ret = snd_soc_fixup_dai_links_platform_name(card, pname);
+ if (ret)
+ return ret;
+
+ return devm_snd_soc_register_card(dev, card);
+}
+
+static struct platform_driver avs_ssp_test_driver = {
+ .probe = avs_ssp_test_probe,
+ .driver = {
+ .name = "avs_ssp_test",
+ .pm = &snd_soc_pm_ops,
+ },
+};
+
+module_platform_driver(avs_ssp_test_driver);
+
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:avs_ssp_test");
--
2.25.1
