This patch allows the std Alsa AC97 codec driver to use any AsoC AC97
controller driver. Currently, only HiFi playback and Capture are
supported atm.
Signed-off-by: Richard Purdie <rpurdie@xxxxxxxxx>
Signed-off-by: Liam Girdwood <liam.girdwood@xxxxxxxxxxxxxxxx>
Index: alsa-kernel/soc/codecs/ac97.c
===================================================================
--- /dev/null
+++ alsa-kernel/soc/codecs/ac97.c
@@ -0,0 +1,167 @@
+/*
+ * ac97.c -- ALSA Soc AC97 codec support
+ *
+ * Copyright 2005 Wolfson Microelectronics PLC.
+ * Author: Liam Girdwood
+ * liam.girdwood@xxxxxxxxxxxxxxxx or linux@xxxxxxxxxxxxxxxx
+ *
+ * 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; either version 2 of the License, or (at your
+ * option) any later version.
+ *
+ * Revision history
+ * 17th Oct 2005 Initial version.
+ *
+ * Generic AC97 support.
+ */
+
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/device.h>
+#include <sound/driver.h>
+#include <sound/core.h>
+#include <sound/pcm.h>
+#include <sound/ac97_codec.h>
+#include <sound/initval.h>
+#include <sound/soc.h>
+
+#define AC97_VERSION "0.5"
+
+#define AC97_DIR \
+ (SND_SOC_DAIDIR_PLAYBACK | SND_SOC_DAIDIR_CAPTURE)
+
+#define AC97_RATES \
+ (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_11025 | SNDRV_PCM_RATE_16000 | \
+ SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | \
+ SNDRV_PCM_RATE_48000)
+
+/* may need to expand this */
+static struct snd_soc_dai_mode soc_ac97[] = {
+ {0, 0, SNDRV_PCM_FMTBIT_S16_LE, AC97_RATES},
+ {0, 0, SNDRV_PCM_FMTBIT_S18_3LE, AC97_RATES},
+ {0, 0, SNDRV_PCM_FMTBIT_S20_3LE, AC97_RATES},
+};
+
+static int ac97_prepare(struct snd_pcm_substream *substream)
+{
+ struct snd_pcm_runtime *runtime = substream->runtime;
+ struct snd_soc_pcm_runtime *rtd = substream->private_data;
+ struct snd_soc_device *socdev = rtd->socdev;
+ struct snd_soc_codec *codec = socdev->codec;
+
+ int reg = (substream->stream == SNDRV_PCM_STREAM_PLAYBACK) ?
+ AC97_PCM_FRONT_DAC_RATE : AC97_PCM_LR_ADC_RATE;
+ return snd_ac97_set_rate(codec->ac97, reg, runtime->rate);
+}
+
+static struct snd_soc_codec_dai ac97_dai = {
+ .name = "AC97 HiFi",
+ .playback = {
+ .stream_name = "AC97 Playback",
+ .channels_min = 1,
+ .channels_max = 2,},
+ .capture = {
+ .stream_name = "AC97 Capture",
+ .channels_min = 1,
+ .channels_max = 2,},
+ .ops = {
+ .prepare = ac97_prepare,},
+ .caps = {
+ .num_modes = ARRAY_SIZE(soc_ac97),
+ .mode = soc_ac97,},
+};
+
+static unsigned int ac97_read(struct snd_soc_codec *codec,
+ unsigned int reg)
+{
+ return soc_ac97_ops.read(codec->ac97, reg);
+}
+
+static int ac97_write(struct snd_soc_codec *codec, unsigned int reg,
+ unsigned int val)
+{
+ soc_ac97_ops.write(codec->ac97, reg, val);
+ return 0;
+}
+
+static int ac97_soc_probe(struct platform_device *pdev)
+{
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+ struct snd_soc_codec *codec;
+ struct snd_ac97_bus *ac97_bus;
+ struct snd_ac97_template ac97_template;
+ int ret = 0;
+
+ printk(KERN_INFO "AC97 SoC Audio Codec %s\n", AC97_VERSION);
+
+ socdev->codec = kzalloc(sizeof(struct snd_soc_codec), GFP_KERNEL);
+ if (socdev->codec == NULL)
+ return -ENOMEM;
+ codec = socdev->codec;
+ mutex_init(&codec->mutex);
+
+ codec->name = "AC97";
+ codec->owner = THIS_MODULE;
+ codec->dai = &ac97_dai;
+ codec->num_dai = 1;
+ codec->write = ac97_write;
+ codec->read = ac97_read;
+ INIT_LIST_HEAD(&codec->dapm_widgets);
+ INIT_LIST_HEAD(&codec->dapm_paths);
+
+ /* register pcms */
+ ret = snd_soc_new_pcms(socdev, SNDRV_DEFAULT_IDX1, SNDRV_DEFAULT_STR1);
+ if(ret < 0)
+ goto err;
+
+ /* add codec as bus device for standard ac97 */
+ ret = snd_ac97_bus(codec->card, 0, &soc_ac97_ops, NULL, &ac97_bus);
+ if(ret < 0)
+ goto bus_err;
+
+ memset(&ac97_template, 0, sizeof(struct snd_ac97_template));
+ ret = snd_ac97_mixer(ac97_bus, &ac97_template, &codec->ac97);
+ if(ret < 0)
+ goto bus_err;
+
+ ret = snd_soc_register_card(socdev);
+ if (ret < 0)
+ goto bus_err;
+ return 0;
+
+bus_err:
+ snd_soc_free_pcms(socdev);
+
+err:
+ kfree(socdev->codec->reg_cache);
+ kfree(socdev->codec);
+ socdev->codec = NULL;
+ return ret;
+}
+
+static int ac97_soc_remove(struct platform_device *pdev)
+{
+ struct snd_soc_device *socdev = platform_get_drvdata(pdev);
+ struct snd_soc_codec *codec = socdev->codec;
+
+ if(codec == NULL)
+ return 0;
+
+ snd_soc_free_pcms(socdev);
+ kfree(socdev->codec->reg_cache);
+ kfree(socdev->codec);
+
+ return 0;
+}
+
+struct snd_soc_codec_device soc_codec_dev_ac97= {
+ .probe = ac97_soc_probe,
+ .remove = ac97_soc_remove,
+};
+
+EXPORT_SYMBOL_GPL(soc_codec_dev_ac97);
+
+MODULE_DESCRIPTION("Soc Generic AC97 driver");
+MODULE_AUTHOR("Liam Girdwood");
+MODULE_LICENSE("GPL");
Index: alsa-kernel/soc/codecs/ac97.h
===================================================================
--- /dev/null
+++ alsa-kernel/soc/codecs/ac97.h
@@ -0,0 +1,18 @@
+/*
+ * linux/sound/codecs/ac97.h -- ALSA SoC Layer
+ *
+ * Author: Liam Girdwood
+ * Created: Dec 1st 2005
+ * Copyright: Wolfson Microelectronics. PLC.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __LINUX_SND_SOC_AC97_H
+#define __LINUX_SND_SOC_AC97_H
+
+extern struct snd_soc_codec_device soc_codec_dev_ac97;
+
+#endif
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