[PATCH v9 0/3] ASoC: MT8173 HDMI jack detection

[PATCH v9 0/3] ASoC: MT8173 HDMI jack detection

[Philipp Zabel]

Hi,

now that a new HDMI state notifier RFC has been posted [1], I've updated this
series to use it instead of the previous prototype. I've also sent the
drm/mediatek part of this series separately [2], which is needed to actually
generate the events the hdmi-codec driver listens for.

Changes since v8:
 - Dropped the HDMI notification prototype patch
 - Rebased onto the "video: add HDMI state notifier support" patch by
   Hans Verkuil, based on Russell King's earlier version.
 - Dropped the drm/mediatek patch

regards
Philipp

[1] https://patchwork.linuxtv.org/patch/38109/
[2] https://patchwork.kernel.org/patch/9430337/

Philipp Zabel (3):
  ASoC: hdmi-codec: use HDMI state notifier to add jack support
  ASoC: mediatek: Add jack detection support to mt8173-rt5650-rt5676
    machine driver
  ASoC: mediatek: Add jack detection support to the mt8173-rt5650
    machine driver

 include/sound/hdmi-codec.h                       |   7 ++
 sound/soc/codecs/Kconfig                         |   1 +
 sound/soc/codecs/hdmi-codec.c                    | 107 +++++++++++++++++++++--
 sound/soc/mediatek/mt8173/mt8173-rt5650-rt5676.c |  42 +++++++++
 sound/soc/mediatek/mt8173/mt8173-rt5650.c        |  42 +++++++++
 5 files changed, 191 insertions(+), 8 deletions(-)

-- 
2.10.2

[PATCH v9 1/3] ASoC: hdmi-codec: use HDMI state notifier to add jack support

[Philipp Zabel]

Use HDMI connection / disconnection notifications to update an ALSA
jack object. Also make a copy of the ELD block after every change.

Signed-off-by: Philipp Zabel <p.zabel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
---
Changes since v8:
 - Rebased onto the "video: add HDMI state notifier support" patch.
   Now hdmi_codec_set_jack_detect needs to be passed the HDMI notifier
   device so the correct notifier can be used.
---
 include/sound/hdmi-codec.h    |   7 +++
 sound/soc/codecs/Kconfig      |   1 +
 sound/soc/codecs/hdmi-codec.c | 107 ++++++++++++++++++++++++++++++++++++++----
 3 files changed, 107 insertions(+), 8 deletions(-)

diff --git a/include/sound/hdmi-codec.h b/include/sound/hdmi-codec.h
index 530c57b..6fe5de2 100644
--- a/include/sound/hdmi-codec.h
+++ b/include/sound/hdmi-codec.h
@@ -98,6 +98,13 @@ struct hdmi_codec_pdata {
 	void *data;
 };
 
+struct snd_soc_codec;
+struct snd_soc_jack;
+
+int hdmi_codec_set_jack_detect(struct snd_soc_codec *codec,
+			       struct snd_soc_jack *jack,
+			       struct device *dev);
+
 #define HDMI_CODEC_DRV_NAME "hdmi-audio-codec"
 
 #endif /* __HDMI_CODEC_H__ */
diff --git a/sound/soc/codecs/Kconfig b/sound/soc/codecs/Kconfig
index c67667b..7ad5d78 100644
--- a/sound/soc/codecs/Kconfig
+++ b/sound/soc/codecs/Kconfig
@@ -511,6 +511,7 @@ config SND_SOC_HDMI_CODEC
 	select SND_PCM_ELD
 	select SND_PCM_IEC958
 	select HDMI
+	select HDMI_NOTIFIERS
 
 config SND_SOC_ES8328
 	tristate "Everest Semi ES8328 CODEC"
diff --git a/sound/soc/codecs/hdmi-codec.c b/sound/soc/codecs/hdmi-codec.c
index b904492..c0a0ba9 100644
--- a/sound/soc/codecs/hdmi-codec.c
+++ b/sound/soc/codecs/hdmi-codec.c
@@ -12,9 +12,12 @@
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
  * General Public License for more details.
  */
+#include <linux/hdmi-notifier.h>
 #include <linux/module.h>
+#include <linux/notifier.h>
 #include <linux/string.h>
 #include <sound/core.h>
+#include <sound/jack.h>
 #include <sound/pcm.h>
 #include <sound/pcm_params.h>
 #include <sound/soc.h>
@@ -36,11 +39,17 @@ LIST_HEAD(hdmi_device_list);
 struct hdmi_codec_priv {
 	struct hdmi_codec_pdata hcd;
 	struct snd_soc_dai_driver *daidrv;
+	struct snd_soc_jack *jack;
 	struct hdmi_codec_daifmt daifmt[2];
 	struct mutex current_stream_lock;
 	struct snd_pcm_substream *current_stream;
 	struct snd_pcm_hw_constraint_list ratec;
+	struct mutex eld_lock;
 	uint8_t eld[MAX_ELD_BYTES];
+	struct device *dev;
+	struct hdmi_notifier *notifier;
+	struct notifier_block nb;
+	unsigned int jack_status;
 };
 
 static const struct snd_soc_dapm_widget hdmi_widgets[] = {
@@ -74,7 +83,9 @@ static int hdmi_eld_ctl_get(struct snd_kcontrol *kcontrol,
 	struct snd_soc_component *component = snd_kcontrol_chip(kcontrol);
 	struct hdmi_codec_priv *hcp = snd_soc_component_get_drvdata(component);
 
+	mutex_lock(&hcp->eld_lock);
 	memcpy(ucontrol->value.bytes.data, hcp->eld, sizeof(hcp->eld));
+	mutex_unlock(&hcp->eld_lock);
 
 	return 0;
 }
@@ -112,7 +123,7 @@ static int hdmi_codec_startup(struct snd_pcm_substream *substream,
 			      struct snd_soc_dai *dai)
 {
 	struct hdmi_codec_priv *hcp = snd_soc_dai_get_drvdata(dai);
-	int ret = 0;
+	int ret;
 
 	dev_dbg(dai->dev, "%s()\n", __func__);
 
@@ -131,17 +142,15 @@ static int hdmi_codec_startup(struct snd_pcm_substream *substream,
 	}
 
 	if (hcp->hcd.ops->get_eld) {
+		mutex_lock(&hcp->eld_lock);
 		ret = hcp->hcd.ops->get_eld(dai->dev->parent, hcp->hcd.data,
 					    hcp->eld, sizeof(hcp->eld));
-
-		if (!ret) {
+		if (!ret)
 			ret = snd_pcm_hw_constraint_eld(substream->runtime,
 							hcp->eld);
-			if (ret)
-				return ret;
-		}
+		mutex_unlock(&hcp->eld_lock);
 	}
-	return 0;
+	return ret;
 }
 
 static void hdmi_codec_shutdown(struct snd_pcm_substream *substream,
@@ -386,6 +395,78 @@ static struct snd_soc_codec_driver hdmi_codec = {
 	},
 };
 
+static void hdmi_codec_jack_report(struct hdmi_codec_priv *hcp,
+				   unsigned int jack_status)
+{
+	if (!hcp->jack)
+		return;
+
+	if (jack_status != hcp->jack_status) {
+		snd_soc_jack_report(hcp->jack, jack_status, SND_JACK_LINEOUT);
+		hcp->jack_status = jack_status;
+	}
+}
+
+static int hdmi_codec_notify(struct notifier_block *nb, unsigned long event,
+			     void *data)
+{
+	struct hdmi_codec_priv *hcp = container_of(nb, struct hdmi_codec_priv,
+						   nb);
+	struct hdmi_notifier *n = data;
+
+	if (!hcp->jack)
+		return NOTIFY_OK;
+
+	switch (event) {
+	case HDMI_NEW_ELD:
+		mutex_lock(&hcp->eld_lock);
+		memcpy(hcp->eld, n->eld, sizeof(hcp->eld));
+		mutex_unlock(&hcp->eld_lock);
+		/* fall through */
+	case HDMI_CONNECTED:
+		hdmi_codec_jack_report(hcp, SND_JACK_LINEOUT);
+		break;
+	case HDMI_DISCONNECTED:
+		hdmi_codec_jack_report(hcp, 0);
+		break;
+	}
+
+	return NOTIFY_OK;
+}
+
+/**
+ * hdmi_codec_set_jack_detect - register HDMI state notifier callback
+ * @codec: the hdmi-codec instance
+ * @jack: ASoC jack to report (dis)connection events on
+ * @dev: hdmi_notifier device, usually HDMI_TX or CEC device
+ */
+int hdmi_codec_set_jack_detect(struct snd_soc_codec *codec,
+			       struct snd_soc_jack *jack,
+			       struct device *dev)
+{
+	struct hdmi_codec_priv *hcp = snd_soc_codec_get_drvdata(codec);
+	int ret;
+
+	hcp->notifier = hdmi_notifier_get(dev);
+	if (!hcp->notifier)
+		return -ENOMEM;
+
+	hcp->nb.notifier_call = hdmi_codec_notify;
+	ret = hdmi_notifier_register(hcp->notifier, &hcp->nb);
+	if (ret)
+		goto err_notifier_put;
+
+	hcp->jack = jack;
+
+	return 0;
+
+err_notifier_put:
+	hdmi_notifier_put(hcp->notifier);
+	hcp->notifier = NULL;
+	return ret;
+}
+EXPORT_SYMBOL_GPL(hdmi_codec_set_jack_detect);
+
 static int hdmi_codec_probe(struct platform_device *pdev)
 {
 	struct hdmi_codec_pdata *hcd = pdev->dev.platform_data;
@@ -441,6 +522,7 @@ static int hdmi_codec_probe(struct platform_device *pdev)
 
 	hcp->hcd = *hcd;
 	mutex_init(&hcp->current_stream_lock);
+	mutex_init(&hcp->eld_lock);
 
 	hcp->daidrv = devm_kzalloc(dev, dai_count * sizeof(*hcp->daidrv),
 				   GFP_KERNEL);
@@ -460,6 +542,8 @@ static int hdmi_codec_probe(struct platform_device *pdev)
 		hcp->daidrv[i].name = hdmi_dai_name[hd->cnt++];
 	}
 
+	dev_set_drvdata(dev, hcp);
+
 	ret = snd_soc_register_codec(dev, &hdmi_codec, hcp->daidrv,
 				     dai_count);
 	if (ret) {
@@ -468,12 +552,19 @@ static int hdmi_codec_probe(struct platform_device *pdev)
 		return ret;
 	}
 
-	dev_set_drvdata(dev, hcp);
+	hcp->dev = dev;
+
 	return 0;
 }
 
 static int hdmi_codec_remove(struct platform_device *pdev)
 {
+	struct hdmi_codec_priv *hcp = platform_get_drvdata(pdev);
+
+	if (hcp->notifier) {
+		hdmi_notifier_unregister(hcp->notifier, &hcp->nb);
+		hdmi_notifier_put(hcp->notifier);
+	}
 	snd_soc_unregister_codec(&pdev->dev);
 	return 0;
 }
-- 
2.10.2

[PATCH v9 2/3] ASoC: mediatek: Add jack detection support to mt8173-rt5650-rt5676 machine driver

[Philipp Zabel]

Find the HDMI state notifier device (CEC) in the device tree and pass it
to hdmi-codec.

Signed-off-by: Philipp Zabel <p.zabel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
---
Changes since v8:
 - Rebased onto the "video: add HDMI state notifier support" patch [1].
   Now we look for the CEC device in the device tree to pass it to
   hdmi_codec_set_jack_detect.
---
 sound/soc/mediatek/mt8173/mt8173-rt5650-rt5676.c | 42 ++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/sound/soc/mediatek/mt8173/mt8173-rt5650-rt5676.c b/sound/soc/mediatek/mt8173/mt8173-rt5650-rt5676.c
index 1b8b2a7..58fa01e 100644
--- a/sound/soc/mediatek/mt8173/mt8173-rt5650-rt5676.c
+++ b/sound/soc/mediatek/mt8173/mt8173-rt5650-rt5676.c
@@ -17,7 +17,9 @@
 #include <linux/module.h>
 #include <linux/gpio.h>
 #include <linux/of_gpio.h>
+#include <linux/of_platform.h>
 #include <sound/soc.h>
+#include <sound/hdmi-codec.h>
 #include <sound/jack.h>
 #include "../../codecs/rt5645.h"
 #include "../../codecs/rt5677.h"
@@ -131,6 +133,27 @@ static struct snd_soc_dai_link_component mt8173_rt5650_rt5676_codecs[] = {
 	},
 };
 
+static struct snd_soc_jack mt8173_hdmi_card_jack;
+
+static int mt8173_hdmi_init(struct snd_soc_pcm_runtime *runtime)
+{
+	struct snd_soc_card *card = runtime->card;
+	struct snd_soc_codec *codec = runtime->codec;
+	struct device *cec_dev = snd_soc_card_get_drvdata(card);
+	int ret;
+
+	/* Enable jack detection */
+	ret = snd_soc_card_jack_new(card, "HDMI Jack", SND_JACK_LINEOUT,
+				    &mt8173_hdmi_card_jack, NULL, 0);
+	if (ret) {
+		dev_err(card->dev, "HDMI Jack creation failed: %d\n", ret);
+		return ret;
+	}
+
+	return hdmi_codec_set_jack_detect(codec, &mt8173_hdmi_card_jack,
+					  cec_dev);
+}
+
 enum {
 	DAI_LINK_PLAYBACK,
 	DAI_LINK_CAPTURE,
@@ -195,6 +218,7 @@ static struct snd_soc_dai_link mt8173_rt5650_rt5676_dais[] = {
 		.no_pcm = 1,
 		.codec_dai_name = "i2s-hifi",
 		.dpcm_playback = 1,
+		.init = mt8173_hdmi_init,
 	},
 	/* rt5676 <-> rt5650 intercodec link: Sets rt5676 I2S2 as master */
 	[DAI_LINK_INTERCODEC] = {
@@ -235,6 +259,8 @@ static int mt8173_rt5650_rt5676_dev_probe(struct platform_device *pdev)
 {
 	struct snd_soc_card *card = &mt8173_rt5650_rt5676_card;
 	struct device_node *platform_node;
+	struct device_node *cec_np;
+	struct platform_device *cec_pdev;
 	int i, ret;
 
 	platform_node = of_parse_phandle(pdev->dev.of_node,
@@ -281,6 +307,22 @@ static int mt8173_rt5650_rt5676_dev_probe(struct platform_device *pdev)
 	card->dev = &pdev->dev;
 	platform_set_drvdata(pdev, card);
 
+	/* The CEC module handles HDMI hotplug detection */
+	cec_np = of_find_compatible_node(pdev->dev.of_node->parent, NULL,
+					 "mediatek,mt8173-cec");
+	if (!cec_np) {
+		dev_err(&pdev->dev, "Failed to find CEC node\n");
+		return -EINVAL;
+	}
+
+	cec_pdev = of_find_device_by_node(cec_np);
+	if (!cec_pdev) {
+		dev_err(&pdev->dev, "Waiting for CEC device %s\n",
+			cec_np->full_name);
+		return -EPROBE_DEFER;
+	}
+
+	snd_soc_card_set_drvdata(card, &cec_pdev->dev);
 	ret = devm_snd_soc_register_card(&pdev->dev, card);
 	if (ret)
 		dev_err(&pdev->dev, "%s snd_soc_register_card fail %d\n",
-- 
2.10.2

[PATCH v9 3/3] ASoC: mediatek: Add jack detection support to the mt8173-rt5650 machine driver

[Philipp Zabel]

Find the HDMI state notifier device (CEC) in the device tree and pass it
to hdmi-codec.

Signed-off-by: Philipp Zabel <p.zabel-bIcnvbaLZ9MEGnE8C9+IrQ@public.gmane.org>
---
Changes since v8:
 - Rebased onto the "video: add HDMI state notifier support" patch.
   Now we look for the CEC device in the device tree to pass it to
   hdmi_codec_set_jack_detect.
---
 sound/soc/mediatek/mt8173/mt8173-rt5650.c | 42 +++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/sound/soc/mediatek/mt8173/mt8173-rt5650.c b/sound/soc/mediatek/mt8173/mt8173-rt5650.c
index ba65f41..daf00cf 100644
--- a/sound/soc/mediatek/mt8173/mt8173-rt5650.c
+++ b/sound/soc/mediatek/mt8173/mt8173-rt5650.c
@@ -17,7 +17,9 @@
 #include <linux/module.h>
 #include <linux/gpio.h>
 #include <linux/of_gpio.h>
+#include <linux/of_platform.h>
 #include <sound/soc.h>
+#include <sound/hdmi-codec.h>
 #include <sound/jack.h>
 #include "../../codecs/rt5645.h"
 
@@ -166,6 +168,27 @@ static struct snd_soc_dai_link_component mt8173_rt5650_codecs[] = {
 	},
 };
 
+static struct snd_soc_jack mt8173_hdmi_card_jack;
+
+static int mt8173_hdmi_init(struct snd_soc_pcm_runtime *runtime)
+{
+	struct snd_soc_card *card = runtime->card;
+	struct snd_soc_codec *codec = runtime->codec;
+	struct device *cec_dev = snd_soc_card_get_drvdata(card);
+	int ret;
+
+	/* Enable jack detection */
+	ret = snd_soc_card_jack_new(card, "HDMI Jack", SND_JACK_LINEOUT,
+				    &mt8173_hdmi_card_jack, NULL, 0);
+	if (ret) {
+		dev_err(card->dev, "HDMI Jack creation failed: %d\n", ret);
+		return ret;
+	}
+
+	return hdmi_codec_set_jack_detect(codec, &mt8173_hdmi_card_jack,
+					  cec_dev);
+}
+
 enum {
 	DAI_LINK_PLAYBACK,
 	DAI_LINK_CAPTURE,
@@ -228,6 +251,7 @@ static struct snd_soc_dai_link mt8173_rt5650_dais[] = {
 		.no_pcm = 1,
 		.codec_dai_name = "i2s-hifi",
 		.dpcm_playback = 1,
+		.init = mt8173_hdmi_init,
 	},
 };
 
@@ -249,6 +273,8 @@ static int mt8173_rt5650_dev_probe(struct platform_device *pdev)
 	struct snd_soc_card *card = &mt8173_rt5650_card;
 	struct device_node *platform_node;
 	struct device_node *np;
+	struct device_node *cec_np;
+	struct platform_device *cec_pdev;
 	const char *codec_capture_dai;
 	int i, ret;
 
@@ -313,6 +339,22 @@ static int mt8173_rt5650_dev_probe(struct platform_device *pdev)
 	card->dev = &pdev->dev;
 	platform_set_drvdata(pdev, card);
 
+	/* The CEC module handles HDMI hotplug detection */
+	cec_np = of_find_compatible_node(pdev->dev.of_node->parent, NULL,
+					 "mediatek,mt8173-cec");
+	if (!cec_np) {
+		dev_err(&pdev->dev, "Failed to find CEC node\n");
+		return -EINVAL;
+	}
+
+	cec_pdev = of_find_device_by_node(cec_np);
+	if (!cec_pdev) {
+		dev_err(&pdev->dev, "Waiting for CEC device %s\n",
+			cec_np->full_name);
+		return -EPROBE_DEFER;
+	}
+
+	snd_soc_card_set_drvdata(card, &cec_pdev->dev);
 	ret = devm_snd_soc_register_card(&pdev->dev, card);
 	if (ret)
 		dev_err(&pdev->dev, "%s snd_soc_register_card fail %d\n",
-- 
2.10.2

Re: [alsa-devel] [PATCH v9 1/3] ASoC: hdmi-codec: use HDMI state notifier to add jack support

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 1474 bytes --]

Hi Philipp,

[auto build test ERROR on asoc/for-next]
[also build test ERROR on v4.9-rc5 next-20161115]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Philipp-Zabel/ASoC-MT8173-HDMI-jack-detection/20161116-103551
base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
config: i386-randconfig-n0-201646 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

>> sound/soc/codecs/hdmi-codec.c:15:33: fatal error: linux/hdmi-notifier.h: No such file or directory
    #include <linux/hdmi-notifier.h>
                                    ^
   compilation terminated.

vim +15 sound/soc/codecs/hdmi-codec.c

     9	 *
    10	 * This program is distributed in the hope that it will be useful, but
    11	 * WITHOUT ANY WARRANTY; without even the implied warranty of
    12	 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
    13	 * General Public License for more details.
    14	 */
  > 15	#include <linux/hdmi-notifier.h>
    16	#include <linux/module.h>
    17	#include <linux/notifier.h>
    18	#include <linux/string.h>

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

[-- Attachment #2: .config.gz --]
[-- Type: application/gzip, Size: 24780 bytes --]

[-- Attachment #3: Type: text/plain, Size: 200 bytes --]

_______________________________________________
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Re: [alsa-devel] [PATCH v9 1/3] ASoC: hdmi-codec: use HDMI state notifier to add jack support

[kbuild test robot]

[-- Attachment #1: Type: text/plain, Size: 2654 bytes --]

Hi Philipp,

[auto build test ERROR on asoc/for-next]
[also build test ERROR on v4.9-rc5 next-20161115]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Philipp-Zabel/ASoC-MT8173-HDMI-jack-detection/20161116-103551
base:   https://git.kernel.org/pub/scm/linux/kernel/git/broonie/sound.git for-next
config: x86_64-randconfig-s1-11161151 (attached as .config)
compiler: gcc-4.4 (Debian 4.4.7-8) 4.4.7
reproduce:
        # save the attached .config to linux build tree
        make ARCH=x86_64 

All error/warnings (new ones prefixed by >>):

>> sound/soc/codecs/hdmi-codec.c:15:33: error: linux/hdmi-notifier.h: No such file or directory
   sound/soc/codecs/hdmi-codec.c: In function 'hdmi_codec_notify':
>> sound/soc/codecs/hdmi-codec.c:426: error: 'HDMI_NEW_ELD' undeclared (first use in this function)
   sound/soc/codecs/hdmi-codec.c:426: error: (Each undeclared identifier is reported only once
   sound/soc/codecs/hdmi-codec.c:426: error: for each function it appears in.)
>> sound/soc/codecs/hdmi-codec.c:428: error: dereferencing pointer to incomplete type
>> sound/soc/codecs/hdmi-codec.c:431: error: 'HDMI_CONNECTED' undeclared (first use in this function)
>> sound/soc/codecs/hdmi-codec.c:434: error: 'HDMI_DISCONNECTED' undeclared (first use in this function)
   sound/soc/codecs/hdmi-codec.c: In function 'hdmi_codec_set_jack_detect':
>> sound/soc/codecs/hdmi-codec.c:455: error: implicit declaration of function 'hdmi_notifier_get'
>> sound/soc/codecs/hdmi-codec.c:455: warning: assignment makes pointer from integer without a cast
>> sound/soc/codecs/hdmi-codec.c:460: error: implicit declaration of function 'hdmi_notifier_register'
>> sound/soc/codecs/hdmi-codec.c:469: error: implicit declaration of function 'hdmi_notifier_put'
   sound/soc/codecs/hdmi-codec.c: In function 'hdmi_codec_remove':
>> sound/soc/codecs/hdmi-codec.c:570: error: implicit declaration of function 'hdmi_notifier_unregister'

vim +15 sound/soc/codecs/hdmi-codec.c

     9	 *
    10	 * This program is distributed in the hope that it will be useful, but
    11	 * WITHOUT ANY WARRANTY; without even the implied warranty of
    12	 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the GNU
    13	 * General Public License for more details.
    14	 */
  > 15	#include <linux/hdmi-notifier.h>
    16	#include <linux/module.h>
    17	#include <linux/notifier.h>
    18	#include <linux/string.h>

---
0-DAY kernel test infrastructure                Open Source Technology Center
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