1 files changed, 143 insertions, 0 deletions
diff --git a/sound/soc/codecs/ac97.c b/sound/soc/codecs/ac97.c
new file mode 100644
index 000000000..0e013edfe
--- /dev/null
+++ b/sound/soc/codecs/ac97.c
@@ -0,0 +1,143 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * ac97.c  --  ALSA Soc AC97 codec support
+ *
+ * Copyright 2005 Wolfson Microelectronics PLC.
+ * Author: Liam Girdwood <lrg@slimlogic.co.uk>
+ *
+ * Generic AC97 support.
+ */
+
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <linux/module.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/ac97_codec.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+static const struct snd_soc_dapm_widget ac97_widgets[] = {
+	SND_SOC_DAPM_INPUT("RX"),
+	SND_SOC_DAPM_OUTPUT("TX"),
+};
+
+static const struct snd_soc_dapm_route ac97_routes[] = {
+	{ "AC97 Capture", NULL, "RX" },
+	{ "TX", NULL, "AC97 Playback" },
+};
+
+static int ac97_prepare(struct snd_pcm_substream *substream,
+			struct snd_soc_dai *dai)
+{
+	struct snd_soc_component *component = dai->component;
+	struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(component);
+
+	int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
+		  AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
+	return snd_ac97_set_rate(ac97, reg, substream->runtime->rate);
+}
+
+static const struct snd_soc_dai_ops ac97_dai_ops = {
+	.prepare	= ac97_prepare,
+};
+
+static struct snd_soc_dai_driver ac97_dai = {
+	.name = "ac97-hifi",
+	.playback = {
+		.stream_name = "AC97 Playback",
+		.channels_min = 1,
+		.channels_max = 2,
+		.rates = SNDRV_PCM_RATE_KNOT,
+		.formats = SND_SOC_STD_AC97_FMTS,},
+	.capture = {
+		.stream_name = "AC97 Capture",
+		.channels_min = 1,
+		.channels_max = 2,
+		.rates = SNDRV_PCM_RATE_KNOT,
+		.formats = SND_SOC_STD_AC97_FMTS,},
+	.ops = &ac97_dai_ops,
+};
+
+static int ac97_soc_probe(struct snd_soc_component *component)
+{
+	struct snd_ac97 *ac97;
+	struct snd_ac97_bus *ac97_bus;
+	struct snd_ac97_template ac97_template;
+	int ret;
+
+	/* add codec as bus device for standard ac97 */
+	ret = snd_ac97_bus(component->card->snd_card, 0, soc_ac97_ops,
+			   NULL, &ac97_bus);
+	if (ret < 0)
+		return ret;
+
+	memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
+	ret = snd_ac97_mixer(ac97_bus, &ac97_template, &ac97);
+	if (ret < 0)
+		return ret;
+
+	snd_soc_component_set_drvdata(component, ac97);
+
+	return 0;
+}
+
+#ifdef CONFIG_PM
+static int ac97_soc_suspend(struct snd_soc_component *component)
+{
+	struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(component);
+
+	snd_ac97_suspend(ac97);
+
+	return 0;
+}
+
+static int ac97_soc_resume(struct snd_soc_component *component)
+{
+
+	struct snd_ac97 *ac97 = snd_soc_component_get_drvdata(component);
+
+	snd_ac97_resume(ac97);
+
+	return 0;
+}
+#else
+#define ac97_soc_suspend NULL
+#define ac97_soc_resume NULL
+#endif
+
+static const struct snd_soc_component_driver soc_component_dev_ac97 = {
+	.probe			= ac97_soc_probe,
+	.suspend		= ac97_soc_suspend,
+	.resume			= ac97_soc_resume,
+	.dapm_widgets		= ac97_widgets,
+	.num_dapm_widgets	= ARRAY_SIZE(ac97_widgets),
+	.dapm_routes		= ac97_routes,
+	.num_dapm_routes	= ARRAY_SIZE(ac97_routes),
+	.idle_bias_on		= 1,
+	.use_pmdown_time	= 1,
+	.endianness		= 1,
+};
+
+static int ac97_probe(struct platform_device *pdev)
+{
+	return devm_snd_soc_register_component(&pdev->dev,
+			&soc_component_dev_ac97, &ac97_dai, 1);
+}
+
+static struct platform_driver ac97_codec_driver = {
+	.driver = {
+		.name = "ac97-codec",
+	},
+
+	.probe = ac97_probe,
+};
+
+module_platform_driver(ac97_codec_driver);
+
+MODULE_DESCRIPTION("Soc Generic AC97 driver");
+MODULE_AUTHOR("Liam Girdwood");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:ac97-codec");