[alsa-devel] [PATCH v4 12/20] ASoC: SOF: Intel: Add support for HDAudio codecs

[Pierre-Louis Bossart]

Add probe, init and cleanup routines for HDaudio.

Signed-off-by: Keyon Jie <yang.jie at linux.intel.com>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart at linux.intel.com>
---
 sound/soc/sof/intel/hda-codec.c | 171 ++++++++++++++++++++++++++++++++
 1 file changed, 171 insertions(+)
 create mode 100644 sound/soc/sof/intel/hda-codec.c

diff --git a/sound/soc/sof/intel/hda-codec.c b/sound/soc/sof/intel/hda-codec.c
new file mode 100644
index 000000000000..bcec7d58465c
--- /dev/null
+++ b/sound/soc/sof/intel/hda-codec.c
@@ -0,0 +1,171 @@
+// SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause)
+//
+// This file is provided under a dual BSD/GPLv2 license.  When using or
+// redistributing this file, you may do so under either license.
+//
+// Copyright(c) 2018 Intel Corporation. All rights reserved.
+//
+// Authors: Keyon Jie <yang.jie at linux.intel.com>
+//
+
+#include <linux/module.h>
+#include <sound/hdaudio_ext.h>
+#include <sound/hda_codec.h>
+#include <sound/hda_i915.h>
+#include <sound/sof.h>
+#include "../ops.h"
+#include "hda.h"
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
+#include "../../codecs/hdac_hda.h"
+#endif /* CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC */
+
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
+#define IDISP_VID_INTEL	0x80860000
+
+/* load the legacy HDA codec driver */
+#ifdef MODULE
+static void hda_codec_load_module(struct hda_codec *codec)
+{
+	char alias[MODULE_NAME_LEN];
+	const char *module = alias;
+
+	snd_hdac_codec_modalias(&codec->core, alias, sizeof(alias));
+	dev_dbg(&codec->core.dev, "loading codec module: %s\n", module);
+	request_module(module);
+}
+#else
+static void hda_codec_load_module(struct hda_codec *codec) {}
+#endif
+
+#endif /* CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC */
+
+/* probe individual codec */
+static int hda_codec_probe(struct snd_sof_dev *sdev, int address)
+{
+	struct hda_bus *hbus = sof_to_hbus(sdev);
+	struct hdac_device *hdev;
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
+	struct hdac_hda_priv *hda_priv;
+#endif
+	u32 hda_cmd = (address << 28) | (AC_NODE_ROOT << 20) |
+		(AC_VERB_PARAMETERS << 8) | AC_PAR_VENDOR_ID;
+	u32 resp = -1;
+	int ret;
+
+	mutex_lock(&hbus->core.cmd_mutex);
+	snd_hdac_bus_send_cmd(&hbus->core, hda_cmd);
+	snd_hdac_bus_get_response(&hbus->core, address, &resp);
+	mutex_unlock(&hbus->core.cmd_mutex);
+	if (resp == -1)
+		return -EIO;
+	dev_dbg(sdev->dev, "HDA codec #%d probed OK: response: %x\n",
+		address, resp);
+
+#if IS_ENABLED(CONFIG_SND_SOC_SOF_HDA_AUDIO_CODEC)
+	/* snd_hdac_ext_bus_device_exit will use kfree to free hdev */
+	hda_priv = kzalloc(sizeof(*hda_priv), GFP_KERNEL);
+	if (!hda_priv)
+		return -ENOMEM;
+
+	hda_priv->codec.bus = hbus;
+	hdev = &hda_priv->codec.core;
+
+	ret = snd_hdac_ext_bus_device_init(&hbus->core, address, hdev);
+	if (ret < 0)
+		return ret;
+
+	/* use legacy bus only for HDA codecs, idisp uses ext bus */
+	if ((resp & 0xFFFF0000) != IDISP_VID_INTEL) {
+		hdev->type = HDA_DEV_LEGACY;
+		hda_codec_load_module(&hda_priv->codec);
+	}
+
+	return 0;
+#else
+	/* snd_hdac_ext_bus_device_exit will use kfree to free hdev */
+	hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
+	if (!hdev)
+		return -ENOMEM;
+
+	ret = snd_hdac_ext_bus_device_init(&hbus->core, address, hdev);
+
+	return ret;
+#endif
+}
+
+/* Codec initialization */
+int hda_codec_probe_bus(struct snd_sof_dev *sdev)
+{
+	struct hdac_bus *bus = sof_to_bus(sdev);
+	int i, ret = 0;
+
+	/* probe codecs in avail slots */
+	for (i = 0; i < HDA_MAX_CODECS; i++) {
+
+		if (!(bus->codec_mask & (1 << i)))
+			continue;
+
+		ret = hda_codec_probe(sdev, i);
+		if (ret < 0) {
+			dev_err(bus->dev, "error: codec #%d probe error, ret: %d\n",
+				i, ret);
+			return ret;
+		}
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(hda_codec_probe_bus);
+
+#if IS_ENABLED(CONFIG_SND_SOC_HDAC_HDMI)
+
+void hda_codec_i915_get(struct snd_sof_dev *sdev)
+{
+	struct hdac_bus *bus = sof_to_bus(sdev);
+
+	dev_dbg(bus->dev, "Turning i915 HDAC power on\n");
+	snd_hdac_display_power(bus, HDA_CODEC_IDX_CONTROLLER, true);
+}
+EXPORT_SYMBOL(hda_codec_i915_get);
+
+void hda_codec_i915_put(struct snd_sof_dev *sdev)
+{
+	struct hdac_bus *bus = sof_to_bus(sdev);
+
+	dev_dbg(bus->dev, "Turning i915 HDAC power off\n");
+	snd_hdac_display_power(bus, HDA_CODEC_IDX_CONTROLLER, false);
+}
+EXPORT_SYMBOL(hda_codec_i915_put);
+
+int hda_codec_i915_init(struct snd_sof_dev *sdev)
+{
+	struct hdac_bus *bus = sof_to_bus(sdev);
+	int ret;
+
+	/* i915 exposes a HDA codec for HDMI audio */
+	ret = snd_hdac_i915_init(bus);
+	if (ret < 0)
+		return ret;
+
+	hda_codec_i915_get(sdev);
+
+	return 0;
+}
+EXPORT_SYMBOL(hda_codec_i915_init);
+
+int hda_codec_i915_exit(struct snd_sof_dev *sdev)
+{
+	struct hdac_bus *bus = sof_to_bus(sdev);
+	int ret;
+
+	hda_codec_i915_put(sdev);
+
+	ret = snd_hdac_i915_exit(bus);
+
+	return ret;
+}
+EXPORT_SYMBOL(hda_codec_i915_exit);
+
+#endif /* CONFIG_SND_SOC_HDAC_HDMI */
+
+MODULE_LICENSE("Dual BSD/GPL");
-- 
2.17.1