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Diffstat (limited to 'sound/soc/codecs/hdac_hda.c')
-rw-r--r--sound/soc/codecs/hdac_hda.c382
1 files changed, 288 insertions, 94 deletions
diff --git a/sound/soc/codecs/hdac_hda.c b/sound/soc/codecs/hdac_hda.c
index ffecdaaa8cf2..680e341aa7f1 100644
--- a/sound/soc/codecs/hdac_hda.c
+++ b/sound/soc/codecs/hdac_hda.c
@@ -7,6 +7,7 @@
* codec drivers using hdac_ext_bus_ops ops.
*/
+#include <linux/firmware.h>
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/module.h>
@@ -14,13 +15,11 @@
#include <sound/pcm_params.h>
#include <sound/soc.h>
#include <sound/hdaudio_ext.h>
+#include <sound/hda_i915.h>
#include <sound/hda_codec.h>
#include <sound/hda_register.h>
-#include "hdac_hda.h"
-#define HDAC_ANALOG_DAI_ID 0
-#define HDAC_DIGITAL_DAI_ID 1
-#define HDAC_ALT_ANALOG_DAI_ID 2
+#include "hdac_hda.h"
#define STUB_FORMATS (SNDRV_PCM_FMTBIT_S8 | \
SNDRV_PCM_FMTBIT_U8 | \
@@ -32,17 +31,31 @@
SNDRV_PCM_FMTBIT_U32_LE | \
SNDRV_PCM_FMTBIT_IEC958_SUBFRAME_LE)
+#define STUB_HDMI_RATES (SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 |\
+ SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 |\
+ SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_176400 |\
+ SNDRV_PCM_RATE_192000)
+
+#ifdef CONFIG_SND_HDA_PATCH_LOADER
+static char *loadable_patch[HDA_MAX_CODECS];
+
+module_param_array_named(patch, loadable_patch, charp, NULL, 0444);
+MODULE_PARM_DESC(patch, "Patch file array for Intel HD audio interface. The array index is the codec address.");
+#endif
+
static int hdac_hda_dai_open(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai);
static void hdac_hda_dai_close(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai);
static int hdac_hda_dai_prepare(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai);
+static int hdac_hda_dai_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai);
static int hdac_hda_dai_hw_free(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai);
-static int hdac_hda_dai_set_tdm_slot(struct snd_soc_dai *dai,
- unsigned int tx_mask, unsigned int rx_mask,
- int slots, int slot_width);
+static int hdac_hda_dai_set_stream(struct snd_soc_dai *dai, void *stream,
+ int direction);
static struct hda_pcm *snd_soc_find_pcm_from_dai(struct hdac_hda_priv *hda_pvt,
struct snd_soc_dai *dai);
@@ -50,8 +63,9 @@ static const struct snd_soc_dai_ops hdac_hda_dai_ops = {
.startup = hdac_hda_dai_open,
.shutdown = hdac_hda_dai_close,
.prepare = hdac_hda_dai_prepare,
+ .hw_params = hdac_hda_dai_hw_params,
.hw_free = hdac_hda_dai_hw_free,
- .set_tdm_slot = hdac_hda_dai_set_tdm_slot,
+ .set_stream = hdac_hda_dai_set_stream,
};
static struct snd_soc_dai_driver hdac_hda_dais[] = {
@@ -117,25 +131,114 @@ static struct snd_soc_dai_driver hdac_hda_dais[] = {
.formats = STUB_FORMATS,
.sig_bits = 24,
},
-}
+},
+};
+
+static struct snd_soc_dai_driver hdac_hda_hdmi_dais[] = {
+{
+ .id = HDAC_HDMI_0_DAI_ID,
+ .name = "intel-hdmi-hifi1",
+ .ops = &hdac_hda_dai_ops,
+ .playback = {
+ .stream_name = "hifi1",
+ .channels_min = 1,
+ .channels_max = 32,
+ .rates = STUB_HDMI_RATES,
+ .formats = STUB_FORMATS,
+ .sig_bits = 24,
+ },
+},
+{
+ .id = HDAC_HDMI_1_DAI_ID,
+ .name = "intel-hdmi-hifi2",
+ .ops = &hdac_hda_dai_ops,
+ .playback = {
+ .stream_name = "hifi2",
+ .channels_min = 1,
+ .channels_max = 32,
+ .rates = STUB_HDMI_RATES,
+ .formats = STUB_FORMATS,
+ .sig_bits = 24,
+ },
+},
+{
+ .id = HDAC_HDMI_2_DAI_ID,
+ .name = "intel-hdmi-hifi3",
+ .ops = &hdac_hda_dai_ops,
+ .playback = {
+ .stream_name = "hifi3",
+ .channels_min = 1,
+ .channels_max = 32,
+ .rates = STUB_HDMI_RATES,
+ .formats = STUB_FORMATS,
+ .sig_bits = 24,
+ },
+},
+{
+ .id = HDAC_HDMI_3_DAI_ID,
+ .name = "intel-hdmi-hifi4",
+ .ops = &hdac_hda_dai_ops,
+ .playback = {
+ .stream_name = "hifi4",
+ .channels_min = 1,
+ .channels_max = 32,
+ .rates = STUB_HDMI_RATES,
+ .formats = STUB_FORMATS,
+ .sig_bits = 24,
+ },
+},
};
-static int hdac_hda_dai_set_tdm_slot(struct snd_soc_dai *dai,
- unsigned int tx_mask, unsigned int rx_mask,
- int slots, int slot_width)
+static int hdac_hda_dai_set_stream(struct snd_soc_dai *dai,
+ void *stream, int direction)
{
struct snd_soc_component *component = dai->component;
struct hdac_hda_priv *hda_pvt;
struct hdac_hda_pcm *pcm;
+ struct hdac_stream *hstream;
+
+ if (!stream)
+ return -EINVAL;
hda_pvt = snd_soc_component_get_drvdata(component);
pcm = &hda_pvt->pcm[dai->id];
- if (tx_mask)
- pcm[dai->id].stream_tag[SNDRV_PCM_STREAM_PLAYBACK] = tx_mask;
+ hstream = (struct hdac_stream *)stream;
+
+ pcm->stream_tag[direction] = hstream->stream_tag;
+
+ return 0;
+}
+
+static int hdac_hda_dai_hw_params(struct snd_pcm_substream *substream,
+ struct snd_pcm_hw_params *params,
+ struct snd_soc_dai *dai)
+{
+ struct snd_soc_component *component = dai->component;
+ struct hdac_hda_priv *hda_pvt;
+ unsigned int format_val;
+ unsigned int maxbps;
+ unsigned int bits;
+
+ if (substream->stream == SNDRV_PCM_STREAM_PLAYBACK)
+ maxbps = dai->driver->playback.sig_bits;
else
- pcm[dai->id].stream_tag[SNDRV_PCM_STREAM_CAPTURE] = rx_mask;
+ maxbps = dai->driver->capture.sig_bits;
+ bits = snd_hdac_stream_format_bits(params_format(params), SNDRV_PCM_SUBFORMAT_STD, maxbps);
+
+ hda_pvt = snd_soc_component_get_drvdata(component);
+ format_val = snd_hdac_stream_format(params_channels(params), bits, params_rate(params));
+ if (!format_val) {
+ dev_err(dai->dev,
+ "%s: invalid format_val, rate=%d, ch=%d, format=%d, maxbps=%d\n",
+ __func__,
+ params_rate(params), params_channels(params),
+ params_format(params), maxbps);
+ return -EINVAL;
+ }
+
+ hda_pvt->pcm[dai->id].format_val[substream->stream] = format_val;
return 0;
}
@@ -153,7 +256,7 @@ static int hdac_hda_dai_hw_free(struct snd_pcm_substream *substream,
return -EINVAL;
hda_stream = &pcm->stream[substream->stream];
- snd_hda_codec_cleanup(&hda_pvt->codec, hda_stream, substream);
+ snd_hda_codec_cleanup(hda_pvt->codec, hda_stream, substream);
return 0;
}
@@ -162,41 +265,27 @@ static int hdac_hda_dai_prepare(struct snd_pcm_substream *substream,
struct snd_soc_dai *dai)
{
struct snd_soc_component *component = dai->component;
- struct hdac_hda_priv *hda_pvt;
- struct snd_pcm_runtime *runtime = substream->runtime;
- struct hdac_device *hdev;
struct hda_pcm_stream *hda_stream;
+ struct hdac_hda_priv *hda_pvt;
unsigned int format_val;
struct hda_pcm *pcm;
unsigned int stream;
int ret = 0;
hda_pvt = snd_soc_component_get_drvdata(component);
- hdev = &hda_pvt->codec.core;
pcm = snd_soc_find_pcm_from_dai(hda_pvt, dai);
if (!pcm)
return -EINVAL;
hda_stream = &pcm->stream[substream->stream];
- format_val = snd_hdac_calc_stream_format(runtime->rate,
- runtime->channels,
- runtime->format,
- hda_stream->maxbps,
- 0);
- if (!format_val) {
- dev_err(&hdev->dev,
- "invalid format_val, rate=%d, ch=%d, format=%d\n",
- runtime->rate, runtime->channels, runtime->format);
- return -EINVAL;
- }
-
stream = hda_pvt->pcm[dai->id].stream_tag[substream->stream];
+ format_val = hda_pvt->pcm[dai->id].format_val[substream->stream];
- ret = snd_hda_codec_prepare(&hda_pvt->codec, hda_stream,
+ ret = snd_hda_codec_prepare(hda_pvt->codec, hda_stream,
stream, format_val, substream);
if (ret < 0)
- dev_err(&hdev->dev, "codec prepare failed %d\n", ret);
+ dev_err(dai->dev, "%s: failed %d\n", __func__, ret);
return ret;
}
@@ -219,9 +308,9 @@ static int hdac_hda_dai_open(struct snd_pcm_substream *substream,
hda_stream = &pcm->stream[substream->stream];
- ret = hda_stream->ops.open(hda_stream, &hda_pvt->codec, substream);
+ ret = hda_stream->ops.open(hda_stream, hda_pvt->codec, substream);
if (ret < 0)
- snd_hda_codec_pcm_put(pcm);
+ dev_err(dai->dev, "%s: failed %d\n", __func__, ret);
return ret;
}
@@ -241,7 +330,7 @@ static void hdac_hda_dai_close(struct snd_pcm_substream *substream,
hda_stream = &pcm->stream[substream->stream];
- hda_stream->ops.close(hda_stream, &hda_pvt->codec, substream);
+ hda_stream->ops.close(hda_stream, hda_pvt->codec, substream);
snd_hda_codec_pcm_put(pcm);
}
@@ -249,10 +338,16 @@ static void hdac_hda_dai_close(struct snd_pcm_substream *substream,
static struct hda_pcm *snd_soc_find_pcm_from_dai(struct hdac_hda_priv *hda_pvt,
struct snd_soc_dai *dai)
{
- struct hda_codec *hcodec = &hda_pvt->codec;
+ struct hda_codec *hcodec = hda_pvt->codec;
struct hda_pcm *cpcm;
const char *pcm_name;
+ /*
+ * map DAI ID to the closest matching PCM name, using the naming
+ * scheme used by hda-codec snd_hda_gen_build_pcms() and for
+ * HDMI in hda_codec patch_hdmi.c)
+ */
+
switch (dai->id) {
case HDAC_ANALOG_DAI_ID:
pcm_name = "Analog";
@@ -263,92 +358,166 @@ static struct hda_pcm *snd_soc_find_pcm_from_dai(struct hdac_hda_priv *hda_pvt,
case HDAC_ALT_ANALOG_DAI_ID:
pcm_name = "Alt Analog";
break;
+ case HDAC_HDMI_0_DAI_ID:
+ pcm_name = "HDMI 0";
+ break;
+ case HDAC_HDMI_1_DAI_ID:
+ pcm_name = "HDMI 1";
+ break;
+ case HDAC_HDMI_2_DAI_ID:
+ pcm_name = "HDMI 2";
+ break;
+ case HDAC_HDMI_3_DAI_ID:
+ pcm_name = "HDMI 3";
+ break;
default:
- dev_err(&hcodec->core.dev, "invalid dai id %d\n", dai->id);
+ dev_err(dai->dev, "%s: invalid dai id %d\n", __func__, dai->id);
return NULL;
}
list_for_each_entry(cpcm, &hcodec->pcm_list_head, list) {
- if (strpbrk(cpcm->name, pcm_name))
+ if (strstr(cpcm->name, pcm_name)) {
+ if (strcmp(pcm_name, "Analog") == 0) {
+ if (strstr(cpcm->name, "Alt Analog"))
+ continue;
+ }
return cpcm;
+ }
}
- dev_err(&hcodec->core.dev, "didn't find PCM for DAI %s\n", dai->name);
+ dev_err(dai->dev, "%s: didn't find PCM for DAI %s\n", __func__, dai->name);
return NULL;
}
+static bool is_hdmi_codec(struct hda_codec *hcodec)
+{
+ struct hda_pcm *cpcm;
+
+ list_for_each_entry(cpcm, &hcodec->pcm_list_head, list) {
+ if (cpcm->pcm_type == HDA_PCM_TYPE_HDMI)
+ return true;
+ }
+
+ return false;
+}
+
static int hdac_hda_codec_probe(struct snd_soc_component *component)
{
struct hdac_hda_priv *hda_pvt =
snd_soc_component_get_drvdata(component);
- struct snd_soc_dapm_context *dapm =
- snd_soc_component_get_dapm(component);
- struct hdac_device *hdev = &hda_pvt->codec.core;
- struct hda_codec *hcodec = &hda_pvt->codec;
+ struct hdac_device *hdev = &hda_pvt->codec->core;
+ struct hda_codec *hcodec = hda_pvt->codec;
+ struct hda_codec_driver *driver = hda_codec_to_driver(hcodec);
struct hdac_ext_link *hlink;
- hda_codec_patch_t patch;
int ret;
- hlink = snd_hdac_ext_bus_get_link(hdev->bus, dev_name(&hdev->dev));
+ hlink = snd_hdac_ext_bus_get_hlink_by_name(hdev->bus, dev_name(&hdev->dev));
if (!hlink) {
- dev_err(&hdev->dev, "hdac link not found\n");
+ dev_err(&hdev->dev, "%s: hdac link not found\n", __func__);
return -EIO;
}
snd_hdac_ext_bus_link_get(hdev->bus, hlink);
+ /*
+ * Ensure any HDA display is powered at codec probe.
+ * After snd_hda_codec_device_new(), display power is
+ * managed by runtime PM.
+ */
+ if (hda_pvt->need_display_power)
+ snd_hdac_display_power(hdev->bus,
+ HDA_CODEC_IDX_CONTROLLER, true);
+
ret = snd_hda_codec_device_new(hcodec->bus, component->card->snd_card,
- hdev->addr, hcodec);
+ hdev->addr, hcodec, true);
if (ret < 0) {
- dev_err(&hdev->dev, "failed to create hda codec %d\n", ret);
+ dev_err(&hdev->dev, "%s: failed to create hda codec %d\n", __func__, ret);
goto error_no_pm;
}
+#ifdef CONFIG_SND_HDA_PATCH_LOADER
+ if (loadable_patch[hda_pvt->dev_index] && *loadable_patch[hda_pvt->dev_index]) {
+ const struct firmware *fw;
+
+ dev_info(&hdev->dev, "Applying patch firmware '%s'\n",
+ loadable_patch[hda_pvt->dev_index]);
+ ret = request_firmware(&fw, loadable_patch[hda_pvt->dev_index],
+ &hdev->dev);
+ if (ret < 0)
+ goto error_no_pm;
+ if (fw) {
+ ret = snd_hda_load_patch(hcodec->bus, fw->size, fw->data);
+ if (ret < 0) {
+ dev_err(&hdev->dev, "%s: failed to load hda patch %d\n", __func__, ret);
+ goto error_no_pm;
+ }
+ release_firmware(fw);
+ }
+ }
+#endif
+ /*
+ * Overwrite type to HDA_DEV_ASOC since it is a ASoC driver
+ * hda_codec.c will check this flag to determine if unregister
+ * device is needed.
+ */
+ hdev->type = HDA_DEV_ASOC;
+
/*
* snd_hda_codec_device_new decrements the usage count so call get pm
* else the device will be powered off
*/
pm_runtime_get_noresume(&hdev->dev);
- hcodec->bus->card = dapm->card->snd_card;
+ hcodec->bus->card = component->card->snd_card;
ret = snd_hda_codec_set_name(hcodec, hcodec->preset->name);
if (ret < 0) {
- dev_err(&hdev->dev, "name failed %s\n", hcodec->preset->name);
- goto error;
+ dev_err(&hdev->dev, "%s: name failed %s\n", __func__, hcodec->preset->name);
+ goto error_pm;
}
ret = snd_hdac_regmap_init(&hcodec->core);
if (ret < 0) {
- dev_err(&hdev->dev, "regmap init failed\n");
- goto error;
+ dev_err(&hdev->dev, "%s: regmap init failed\n", __func__);
+ goto error_pm;
}
- patch = (hda_codec_patch_t)hcodec->preset->driver_data;
- if (patch) {
- ret = patch(hcodec);
- if (ret < 0) {
- dev_err(&hdev->dev, "patch failed %d\n", ret);
- goto error;
- }
- } else {
- dev_dbg(&hdev->dev, "no patch file found\n");
+ if (WARN_ON(!(driver->ops && driver->ops->probe))) {
+ ret = -EINVAL;
+ goto error_regmap;
}
- ret = snd_hda_codec_parse_pcms(hcodec);
+ ret = driver->ops->probe(hcodec, hcodec->preset);
if (ret < 0) {
- dev_err(&hdev->dev, "unable to map pcms to dai %d\n", ret);
- goto error;
+ dev_err(&hdev->dev, "%s: probe failed %d\n", __func__, ret);
+ goto error_regmap;
}
- ret = snd_hda_codec_build_controls(hcodec);
+ ret = snd_hda_codec_parse_pcms(hcodec);
if (ret < 0) {
- dev_err(&hdev->dev, "unable to create controls %d\n", ret);
- goto error;
+ dev_err(&hdev->dev, "%s: unable to map pcms to dai %d\n", __func__, ret);
+ goto error_patch;
+ }
+
+ /* HDMI controls need to be created in machine drivers */
+ if (!is_hdmi_codec(hcodec)) {
+ ret = snd_hda_codec_build_controls(hcodec);
+ if (ret < 0) {
+ dev_err(&hdev->dev, "%s: unable to create controls %d\n",
+ __func__, ret);
+ goto error_patch;
+ }
}
hcodec->core.lazy_cache = true;
+ if (hda_pvt->need_display_power)
+ snd_hdac_display_power(hdev->bus,
+ HDA_CODEC_IDX_CONTROLLER, false);
+
+ /* match for forbid call in snd_hda_codec_device_new() */
+ pm_runtime_allow(&hdev->dev);
+
/*
* hdac_device core already sets the state to active and calls
* get_noresume. So enable runtime and set the device to suspend.
@@ -359,7 +528,12 @@ static int hdac_hda_codec_probe(struct snd_soc_component *component)
return 0;
-error:
+error_patch:
+ if (driver->ops->remove)
+ driver->ops->remove(hcodec);
+error_regmap:
+ snd_hdac_regmap_exit(hdev);
+error_pm:
pm_runtime_put(&hdev->dev);
error_no_pm:
snd_hdac_ext_bus_link_put(hdev->bus, hlink);
@@ -370,17 +544,24 @@ static void hdac_hda_codec_remove(struct snd_soc_component *component)
{
struct hdac_hda_priv *hda_pvt =
snd_soc_component_get_drvdata(component);
- struct hdac_device *hdev = &hda_pvt->codec.core;
+ struct hdac_device *hdev = &hda_pvt->codec->core;
+ struct hda_codec *codec = hda_pvt->codec;
+ struct hda_codec_driver *driver = hda_codec_to_driver(codec);
struct hdac_ext_link *hlink = NULL;
- hlink = snd_hdac_ext_bus_get_link(hdev->bus, dev_name(&hdev->dev));
+ hlink = snd_hdac_ext_bus_get_hlink_by_name(hdev->bus, dev_name(&hdev->dev));
if (!hlink) {
- dev_err(&hdev->dev, "hdac link not found\n");
+ dev_err(&hdev->dev, "%s: hdac link not found\n", __func__);
return;
}
- snd_hdac_ext_bus_link_put(hdev->bus, hlink);
pm_runtime_disable(&hdev->dev);
+ snd_hdac_ext_bus_link_put(hdev->bus, hlink);
+
+ if (driver->ops->remove)
+ driver->ops->remove(codec);
+
+ snd_hda_codec_cleanup_for_unbind(codec);
}
static const struct snd_soc_dapm_route hdac_hda_dapm_routes[] = {
@@ -420,43 +601,52 @@ static const struct snd_soc_dapm_widget hdac_hda_dapm_widgets[] = {
};
static const struct snd_soc_component_driver hdac_hda_codec = {
- .probe = hdac_hda_codec_probe,
- .remove = hdac_hda_codec_remove,
- .idle_bias_on = false,
- .dapm_widgets = hdac_hda_dapm_widgets,
- .num_dapm_widgets = ARRAY_SIZE(hdac_hda_dapm_widgets),
- .dapm_routes = hdac_hda_dapm_routes,
- .num_dapm_routes = ARRAY_SIZE(hdac_hda_dapm_routes),
+ .probe = hdac_hda_codec_probe,
+ .remove = hdac_hda_codec_remove,
+ .dapm_widgets = hdac_hda_dapm_widgets,
+ .num_dapm_widgets = ARRAY_SIZE(hdac_hda_dapm_widgets),
+ .dapm_routes = hdac_hda_dapm_routes,
+ .num_dapm_routes = ARRAY_SIZE(hdac_hda_dapm_routes),
+ .idle_bias_on = false,
+ .endianness = 1,
+};
+
+static const struct snd_soc_component_driver hdac_hda_hdmi_codec = {
+ .probe = hdac_hda_codec_probe,
+ .remove = hdac_hda_codec_remove,
+ .idle_bias_on = false,
+ .endianness = 1,
};
static int hdac_hda_dev_probe(struct hdac_device *hdev)
{
+ struct hdac_hda_priv *hda_pvt = dev_get_drvdata(&hdev->dev);
struct hdac_ext_link *hlink;
- struct hdac_hda_priv *hda_pvt;
int ret;
/* hold the ref while we probe */
- hlink = snd_hdac_ext_bus_get_link(hdev->bus, dev_name(&hdev->dev));
+ hlink = snd_hdac_ext_bus_get_hlink_by_name(hdev->bus, dev_name(&hdev->dev));
if (!hlink) {
- dev_err(&hdev->dev, "hdac link not found\n");
+ dev_err(&hdev->dev, "%s: hdac link not found\n", __func__);
return -EIO;
}
snd_hdac_ext_bus_link_get(hdev->bus, hlink);
- hda_pvt = hdac_to_hda_priv(hdev);
- if (!hda_pvt)
- return -ENOMEM;
-
/* ASoC specific initialization */
- ret = devm_snd_soc_register_component(&hdev->dev,
- &hdac_hda_codec, hdac_hda_dais,
- ARRAY_SIZE(hdac_hda_dais));
+ if (hda_pvt->need_display_power)
+ ret = devm_snd_soc_register_component(&hdev->dev,
+ &hdac_hda_hdmi_codec, hdac_hda_hdmi_dais,
+ ARRAY_SIZE(hdac_hda_hdmi_dais));
+ else
+ ret = devm_snd_soc_register_component(&hdev->dev,
+ &hdac_hda_codec, hdac_hda_dais,
+ ARRAY_SIZE(hdac_hda_dais));
+
if (ret < 0) {
- dev_err(&hdev->dev, "failed to register HDA codec %d\n", ret);
+ dev_err(&hdev->dev, "%s: failed to register HDA codec %d\n", __func__, ret);
return ret;
}
- dev_set_drvdata(&hdev->dev, hda_pvt);
snd_hdac_ext_bus_link_put(hdev->bus, hlink);
return ret;
@@ -464,6 +654,10 @@ static int hdac_hda_dev_probe(struct hdac_device *hdev)
static int hdac_hda_dev_remove(struct hdac_device *hdev)
{
+ /*
+ * Resources are freed in hdac_hda_codec_remove(). This
+ * function is kept to keep hda_codec_driver_remove() happy.
+ */
return 0;
}