[RESEND PATCH v1 0/6] Enable Greybus Audio codec driver

[RESEND PATCH v1 0/6] Enable Greybus Audio codec driver

[Vaibhav Agarwal]

[REQUEST]

This patch series intends to "Enable Greybus Audio codec driver"
existing in the staging tree. I have shared the original patch series with
Greybus-Dev mailing list and as per the suggestion from Alexandre, I'm
also interested to push Greybus Audio to sound soc tree. Thus, now I'm
resending it to ASoc maintainers for review.

Following is the top level SW design for GB Codec driver and GB Audio
modules.

                                            +--------------+
                            +-------------->+GBA Module 1  |
                            |               +--------------+
    +-----------------------+
    |            |          |
    |            | Greybus  |               +--------------+
    | SND SOC    | Audio    +-------------->+GBA Module 2  |
    | Framework  | Codec    |               +--------------+
    |            | Driver   |
    |            |          |
    +-----------------------+               +--------------+
                            +-------------->+GBA Module N  |
                                            +--------------+

Patch 5 contains the changes to provide helper APIs to link DAPM DAI widgets
for the module added and remove/free component controls for the module removed
dynamically. Eventually, I propose to extend snd_soc_xxx APIs for this
purpose.

Kindly share your inputs.

[COVER LETTER]

The existing GB Audio codec driver is dependent on MSM8994 Audio driver.
During the development stage, this depdency was configured due to
various changes involved in MSM Audio driver to enable addtional codec
card and some of the changes proposed in mainline ASoC framework.
However, these are not the real dependencies and some of them can be
easily removed.

The folowing patch series includes the changes to resolve unnecessary
depedencies and make the codec driver functional with the latest kernel.

Patch 1,2: Incudes jack framework related changes.
Patch 3,4,5: Resolves compilation error observed with the latest kernel and
also provides helper APIs required to allow dynamic addition/removal of
modules.
Patch 6: Finally provides config options and related Makefile changes to
enable GB Codec driver.

Thanks to Alexandre for raising the headsup [1] and motivating me to provide
the necessary changes.

[1] https://lore.kernel.org/lkml/20200507212912.599433-1-alexandre.belloni@bootlin.com/


Vaibhav Agarwal (6):
  staging: greybus: audio: Update snd_jack FW usage as per new APIs
  staging: greybus: audio: Maintain jack list within GB Audio module
  staging: greybus: audio: Resolve compilation errors for GB codec
    module
  staging: greybus: audio: Resolve compilation error in topology parser
  staging: greybus: audio: Add helper APIs for dynamic audio modules
  staging: greybus: audio: Enable GB codec, audio module compilation.

 drivers/staging/greybus/Kconfig          |  14 +-
 drivers/staging/greybus/Makefile         |   6 +-
 drivers/staging/greybus/audio_codec.c    | 187 +++++++++++++--------
 drivers/staging/greybus/audio_codec.h    |  12 +-
 drivers/staging/greybus/audio_helper.c   | 197 +++++++++++++++++++++++
 drivers/staging/greybus/audio_helper.h   |  17 ++
 drivers/staging/greybus/audio_module.c   |  20 +--
 drivers/staging/greybus/audio_topology.c | 130 +++++++--------
 8 files changed, 427 insertions(+), 156 deletions(-)
 create mode 100644 drivers/staging/greybus/audio_helper.c
 create mode 100644 drivers/staging/greybus/audio_helper.h


base-commit: ae73e7784871ebe2c43da619b4a1e2c9ff81508d
-- 
2.26.2

[RESEND PATCH v1 1/6] staging: greybus: audio: Update snd_jack FW usage as per new APIs

[Vaibhav Agarwal]

snd_soc_jack APIs are modified in recent kernel versions. This patch
updates the codec driver to resolve the compilation errors related to
jack framework.

Signed-off-by: Vaibhav Agarwal <vaibhav.sr@gmail.com>
---
 drivers/staging/greybus/audio_codec.c | 59 +++++++++++++++++++++------
 1 file changed, 47 insertions(+), 12 deletions(-)

diff --git a/drivers/staging/greybus/audio_codec.c b/drivers/staging/greybus/audio_codec.c
index 08746c85dea6..ebf8484f0ae7 100644
--- a/drivers/staging/greybus/audio_codec.c
+++ b/drivers/staging/greybus/audio_codec.c
@@ -709,17 +709,29 @@ static struct snd_soc_dai_driver gbaudio_dai[] = {
 };
 
 static int gbaudio_init_jack(struct gbaudio_module_info *module,
-			     struct snd_soc_codec *codec)
+			     struct snd_soc_card *card)
 {
 	int ret;
 
+	struct snd_soc_jack *jack;
+	struct snd_soc_jack_pin *headset, *button;
+
 	if (!module->jack_mask)
 		return 0;
 
 	snprintf(module->jack_name, NAME_SIZE, "GB %d Headset Jack",
 		 module->dev_id);
-	ret = snd_soc_jack_new(codec, module->jack_name, module->jack_mask,
-			       &module->headset_jack);
+
+	headset = devm_kzalloc(module->dev, sizeof(*headset), GFP_KERNEL);
+	if (!headset)
+		return -ENOMEM;
+
+	headset->pin = module->jack_name;
+	headset->mask = module->jack_mask;
+	jack = &module->headset_jack;
+
+	ret = snd_soc_card_jack_new(card, module->jack_name, module->jack_mask,
+				    jack, headset, 1);
 	if (ret) {
 		dev_err(module->dev, "Failed to create new jack\n");
 		return ret;
@@ -730,11 +742,21 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
 
 	snprintf(module->button_name, NAME_SIZE, "GB %d Button Jack",
 		 module->dev_id);
-	ret = snd_soc_jack_new(codec, module->button_name, module->button_mask,
-			       &module->button_jack);
+	button = devm_kzalloc(module->dev, sizeof(*headset), GFP_KERNEL);
+	if (!button) {
+		ret = -ENOMEM;
+		goto free_headset;
+	}
+
+	button->pin = module->button_name;
+	button->mask = module->button_mask;
+	jack = &module->button_jack;
+
+	ret = snd_soc_card_jack_new(card, module->button_name,
+				    module->button_mask, jack, button, 1);
 	if (ret) {
 		dev_err(module->dev, "Failed to create button jack\n");
-		return ret;
+		goto free_headset;
 	}
 
 	/*
@@ -750,7 +772,7 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
 				       KEY_MEDIA);
 		if (ret) {
 			dev_err(module->dev, "Failed to set BTN_0\n");
-			return ret;
+			goto free_button;
 		}
 	}
 
@@ -759,7 +781,7 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
 				       KEY_VOICECOMMAND);
 		if (ret) {
 			dev_err(module->dev, "Failed to set BTN_1\n");
-			return ret;
+			goto free_button;
 		}
 	}
 
@@ -768,7 +790,7 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
 				       KEY_VOLUMEUP);
 		if (ret) {
 			dev_err(module->dev, "Failed to set BTN_2\n");
-			return ret;
+			goto free_button;
 		}
 	}
 
@@ -777,7 +799,7 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
 				       KEY_VOLUMEDOWN);
 		if (ret) {
 			dev_err(module->dev, "Failed to set BTN_0\n");
-			return ret;
+			goto free_button;
 		}
 	}
 
@@ -788,6 +810,18 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
 	*/
 
 	return 0;
+
+free_button:
+	jack = &module->button_jack;
+	snd_device_free(card->snd_card, jack->jack);
+	list_del(&jack->list);
+
+free_headset:
+	jack = &module->headset_jack;
+	snd_device_free(card->snd_card, jack->jack);
+	list_del(&jack->list);
+
+	return ret;
 }
 
 int gbaudio_register_module(struct gbaudio_module_info *module)
@@ -815,7 +849,7 @@ int gbaudio_register_module(struct gbaudio_module_info *module)
 		return -EINVAL;
 	}
 
-	ret = gbaudio_init_jack(module, codec);
+	ret = gbaudio_init_jack(module, component->card);
 	if (ret) {
 		up_write(&card->controls_rwsem);
 		return ret;
@@ -942,7 +976,8 @@ void gbaudio_unregister_module(struct gbaudio_module_info *module)
 
 #ifdef CONFIG_SND_JACK
 	/* free jack devices for this module from codec->jack_list */
-	list_for_each_entry_safe(jack, next_j, &codec->jack_list, list) {
+	list_for_each_entry_safe(jack, next_j, &component->card->jack_list,
+				 list) {
 		if (jack == &module->headset_jack)
 			mask = GBCODEC_JACK_MASK;
 		else if (jack == &module->button_jack)
-- 
2.26.2

Re: [RESEND PATCH v1 1/6] staging: greybus: audio: Update snd_jack FW usage as per new APIs

[Dan Carpenter]

On Tue, Jun 02, 2020 at 10:51:10AM +0530, Vaibhav Agarwal wrote:
> diff --git a/drivers/staging/greybus/audio_codec.c b/drivers/staging/greybus/audio_codec.c
> index 08746c85dea6..ebf8484f0ae7 100644
> --- a/drivers/staging/greybus/audio_codec.c
> +++ b/drivers/staging/greybus/audio_codec.c
> @@ -709,17 +709,29 @@ static struct snd_soc_dai_driver gbaudio_dai[] = {
>  };
>  
>  static int gbaudio_init_jack(struct gbaudio_module_info *module,
> -			     struct snd_soc_codec *codec)
> +			     struct snd_soc_card *card)
>  {
>  	int ret;
>  

No blank line please.

> +	struct snd_soc_jack *jack;

This code would be nicer without the "jack" pointer.  Just use
"module->headset_jack" directly so that it's easier to use grep on the
code.

> +	struct snd_soc_jack_pin *headset, *button;
> +
>  	if (!module->jack_mask)
>  		return 0;
>  
>  	snprintf(module->jack_name, NAME_SIZE, "GB %d Headset Jack",
>  		 module->dev_id);
> -	ret = snd_soc_jack_new(codec, module->jack_name, module->jack_mask,
> -			       &module->headset_jack);
> +
> +	headset = devm_kzalloc(module->dev, sizeof(*headset), GFP_KERNEL);
> +	if (!headset)
> +		return -ENOMEM;
> +
> +	headset->pin = module->jack_name;
> +	headset->mask = module->jack_mask;
> +	jack = &module->headset_jack;
> +
> +	ret = snd_soc_card_jack_new(card, module->jack_name, module->jack_mask,
> +				    jack, headset, 1);
>  	if (ret) {
>  		dev_err(module->dev, "Failed to create new jack\n");
>  		return ret;
> @@ -730,11 +742,21 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
>  
>  	snprintf(module->button_name, NAME_SIZE, "GB %d Button Jack",
>  		 module->dev_id);
> -	ret = snd_soc_jack_new(codec, module->button_name, module->button_mask,
> -			       &module->button_jack);
> +	button = devm_kzalloc(module->dev, sizeof(*headset), GFP_KERNEL);
                                           ^^^^^^^^^^^^^^^^
Use "sizeof(*button)".  It's the same size so it doesn't affect runtime.


> +	if (!button) {
> +		ret = -ENOMEM;
> +		goto free_headset;
> +	}

regards,
dan carpenter

[RESEND PATCH v1 2/6] staging: greybus: audio: Maintain jack list within GB Audio module

[Vaibhav Agarwal]

As per the current implementation for GB codec driver, a jack list is
maintained for each module. And it expects the list to be populated by
the snd_soc_jack structure which would require modifications in
mainstream code.

However, this is not a necessary requirement and the list can be easily
maintained within gbaudio_module_info as well. This patch provides the
relevant changes for the same.

Signed-off-by: Vaibhav Agarwal <vaibhav.sr@gmail.com>
---
 drivers/staging/greybus/audio_codec.c  | 76 ++++++++++++++------------
 drivers/staging/greybus/audio_codec.h  | 10 +++-
 drivers/staging/greybus/audio_module.c | 20 ++++---
 3 files changed, 60 insertions(+), 46 deletions(-)

diff --git a/drivers/staging/greybus/audio_codec.c b/drivers/staging/greybus/audio_codec.c
index ebf8484f0ae7..a2ee587e5a79 100644
--- a/drivers/staging/greybus/audio_codec.c
+++ b/drivers/staging/greybus/audio_codec.c
@@ -712,7 +712,7 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
 			     struct snd_soc_card *card)
 {
 	int ret;
-
+	struct gbaudio_jack *gba_jack, *n;
 	struct snd_soc_jack *jack;
 	struct snd_soc_jack_pin *headset, *button;
 
@@ -728,7 +728,8 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
 
 	headset->pin = module->jack_name;
 	headset->mask = module->jack_mask;
-	jack = &module->headset_jack;
+	gba_jack = &module->headset;
+	jack = &gba_jack->jack;
 
 	ret = snd_soc_card_jack_new(card, module->jack_name, module->jack_mask,
 				    jack, headset, 1);
@@ -737,6 +738,9 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
 		return ret;
 	}
 
+	/* Add to module's jack list */
+	list_add(&gba_jack->list, &module->jack_list);
+
 	if (!module->button_mask)
 		return 0;
 
@@ -745,20 +749,24 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
 	button = devm_kzalloc(module->dev, sizeof(*headset), GFP_KERNEL);
 	if (!button) {
 		ret = -ENOMEM;
-		goto free_headset;
+		goto free_jack;
 	}
 
 	button->pin = module->button_name;
 	button->mask = module->button_mask;
-	jack = &module->button_jack;
+	gba_jack = &module->button;
+	jack = &gba_jack->jack;
 
 	ret = snd_soc_card_jack_new(card, module->button_name,
 				    module->button_mask, jack, button, 1);
 	if (ret) {
 		dev_err(module->dev, "Failed to create button jack\n");
-		goto free_headset;
+		goto free_jack;
 	}
 
+	/* Add to module's jack list */
+	list_add(&gba_jack->list, &module->jack_list);
+
 	/*
 	 * Currently, max 4 buttons are supported with following key mapping
 	 * BTN_0 = KEY_MEDIA
@@ -768,58 +776,55 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
 	 */
 
 	if (module->button_mask & SND_JACK_BTN_0) {
-		ret = snd_jack_set_key(module->button_jack.jack, SND_JACK_BTN_0,
+		ret = snd_jack_set_key(jack->jack, SND_JACK_BTN_0,
 				       KEY_MEDIA);
 		if (ret) {
 			dev_err(module->dev, "Failed to set BTN_0\n");
-			goto free_button;
+			goto free_jack;
 		}
 	}
 
 	if (module->button_mask & SND_JACK_BTN_1) {
-		ret = snd_jack_set_key(module->button_jack.jack, SND_JACK_BTN_1,
+		ret = snd_jack_set_key(jack->jack, SND_JACK_BTN_1,
 				       KEY_VOICECOMMAND);
 		if (ret) {
 			dev_err(module->dev, "Failed to set BTN_1\n");
-			goto free_button;
+			goto free_jack;
 		}
 	}
 
 	if (module->button_mask & SND_JACK_BTN_2) {
-		ret = snd_jack_set_key(module->button_jack.jack, SND_JACK_BTN_2,
+		ret = snd_jack_set_key(jack->jack, SND_JACK_BTN_2,
 				       KEY_VOLUMEUP);
 		if (ret) {
 			dev_err(module->dev, "Failed to set BTN_2\n");
-			goto free_button;
+			goto free_jack;
 		}
 	}
 
 	if (module->button_mask & SND_JACK_BTN_3) {
-		ret = snd_jack_set_key(module->button_jack.jack, SND_JACK_BTN_3,
+		ret = snd_jack_set_key(jack->jack, SND_JACK_BTN_3,
 				       KEY_VOLUMEDOWN);
 		if (ret) {
 			dev_err(module->dev, "Failed to set BTN_0\n");
-			goto free_button;
+			goto free_jack;
 		}
 	}
 
 	/* FIXME
 	 * verify if this is really required
 	set_bit(INPUT_PROP_NO_DUMMY_RELEASE,
-		module->button_jack.jack->input_dev->propbit);
+		module->button->jack->jack->input_dev->propbit);
 	*/
 
 	return 0;
 
-free_button:
-	jack = &module->button_jack;
-	snd_device_free(card->snd_card, jack->jack);
-	list_del(&jack->list);
-
-free_headset:
-	jack = &module->headset_jack;
-	snd_device_free(card->snd_card, jack->jack);
-	list_del(&jack->list);
+free_jack:
+	list_for_each_entry_safe(gba_jack, n, &module->jack_list, list) {
+		jack = &gba_jack->jack;
+		snd_device_free(card->snd_card, jack->jack);
+		list_del(&gba_jack->list);
+	}
 
 	return ret;
 }
@@ -829,6 +834,7 @@ int gbaudio_register_module(struct gbaudio_module_info *module)
 	int ret;
 	struct snd_soc_codec *codec;
 	struct snd_card *card;
+	struct gbaudio_jack *gba_jack = NULL;
 	struct snd_soc_jack *jack = NULL;
 
 	if (!gbcodec) {
@@ -874,11 +880,10 @@ int gbaudio_register_module(struct gbaudio_module_info *module)
 		 * register jack devices for this module
 		 * from codec->jack_list
 		 */
-		list_for_each_entry(jack, &codec->jack_list, list) {
-			if ((jack == &module->headset_jack) ||
-			    (jack == &module->button_jack))
-				snd_device_register(codec->card->snd_card,
-						    jack->jack);
+		list_for_each_entry(gba_jack, &module->jack_list, list) {
+			jack = &gba_jack->jack;
+			snd_device_register(codec->card->snd_card,
+					    jack->jack);
 		}
 #endif
 	}
@@ -962,7 +967,8 @@ void gbaudio_unregister_module(struct gbaudio_module_info *module)
 {
 	struct snd_soc_codec *codec = gbcodec->codec;
 	struct snd_card *card = codec->card->snd_card;
-	struct snd_soc_jack *jack, *next_j;
+	struct gbaudio_jack *gba_jack, *n;
+	struct snd_soc_jack *jack;
 	int mask;
 
 	dev_dbg(codec->dev, "Unregister %s module\n", module->name);
@@ -975,21 +981,21 @@ void gbaudio_unregister_module(struct gbaudio_module_info *module)
 	mutex_unlock(&gbcodec->lock);
 
 #ifdef CONFIG_SND_JACK
-	/* free jack devices for this module from codec->jack_list */
-	list_for_each_entry_safe(jack, next_j, &component->card->jack_list,
-				 list) {
-		if (jack == &module->headset_jack)
+	/* free jack devices for this module jack_list */
+	list_for_each_entry_safe(gba_jack, n, &module->jack_list, list) {
+		if (gba_jack == &module->headset)
 			mask = GBCODEC_JACK_MASK;
-		else if (jack == &module->button_jack)
+		else if (gba_jack == &module->button)
 			mask = GBCODEC_JACK_BUTTON_MASK;
 		else
 			mask = 0;
 		if (mask) {
+			jack = &gba_jack->jack;
 			dev_dbg(module->dev, "Report %s removal\n",
 				jack->jack->id);
 			snd_soc_jack_report(jack, 0, mask);
 			snd_device_free(codec->card->snd_card, jack->jack);
-			list_del(&jack->list);
+			list_del(&gba_jack->list);
 		}
 	}
 #endif
diff --git a/drivers/staging/greybus/audio_codec.h b/drivers/staging/greybus/audio_codec.h
index cb5d271da1a5..af9195eceb3a 100644
--- a/drivers/staging/greybus/audio_codec.h
+++ b/drivers/staging/greybus/audio_codec.h
@@ -106,6 +106,11 @@ enum gbaudio_module_state {
 	GBAUDIO_MODULE_ON,
 };
 
+struct gbaudio_jack {
+	struct snd_soc_jack jack;
+	struct list_head list;
+};
+
 struct gbaudio_module_info {
 	/* module info */
 	struct device *dev;
@@ -130,8 +135,8 @@ struct gbaudio_module_info {
 	int jack_mask;
 	int button_mask;
 	int button_status;
-	struct snd_soc_jack headset_jack;
-	struct snd_soc_jack button_jack;
+	struct gbaudio_jack headset;
+	struct gbaudio_jack button;
 
 	/* connection info */
 	struct gb_connection *mgmt_connection;
@@ -155,6 +160,7 @@ struct gbaudio_module_info {
 	struct list_head widget_list;
 	struct list_head ctl_list;
 	struct list_head widget_ctl_list;
+	struct list_head jack_list;
 
 	struct gb_audio_topology *topology;
 };
diff --git a/drivers/staging/greybus/audio_module.c b/drivers/staging/greybus/audio_module.c
index 300a2b4f3fc7..cdd4b6be5e9c 100644
--- a/drivers/staging/greybus/audio_module.c
+++ b/drivers/staging/greybus/audio_module.c
@@ -21,8 +21,10 @@ static int gbaudio_request_jack(struct gbaudio_module_info *module,
 				struct gb_audio_jack_event_request *req)
 {
 	int report;
-	struct snd_jack *jack = module->headset_jack.jack;
-	struct snd_jack *btn_jack = module->button_jack.jack;
+	struct snd_soc_jack *hs = &module->headset.jack;
+	struct snd_soc_jack *btn = &module->button.jack;
+	struct snd_jack *jack = hs->jack;
+	struct snd_jack *btn_jack = btn->jack;
 
 	if (!jack) {
 		dev_err_ratelimited(module->dev,
@@ -38,12 +40,10 @@ static int gbaudio_request_jack(struct gbaudio_module_info *module,
 	if (req->event == GB_AUDIO_JACK_EVENT_REMOVAL) {
 		module->jack_type = 0;
 		if (btn_jack && module->button_status) {
-			snd_soc_jack_report(&module->button_jack, 0,
-					    module->button_mask);
+			snd_soc_jack_report(btn, 0, module->button_mask);
 			module->button_status = 0;
 		}
-		snd_soc_jack_report(&module->headset_jack, 0,
-				    module->jack_mask);
+		snd_soc_jack_report(hs, 0, module->jack_mask);
 		return 0;
 	}
 
@@ -61,7 +61,7 @@ static int gbaudio_request_jack(struct gbaudio_module_info *module,
 				     module->jack_type, report);
 
 	module->jack_type = report;
-	snd_soc_jack_report(&module->headset_jack, report, module->jack_mask);
+	snd_soc_jack_report(hs, report, module->jack_mask);
 
 	return 0;
 }
@@ -70,7 +70,8 @@ static int gbaudio_request_button(struct gbaudio_module_info *module,
 				  struct gb_audio_button_event_request *req)
 {
 	int soc_button_id, report;
-	struct snd_jack *btn_jack = module->button_jack.jack;
+	struct snd_soc_jack *btn = &module->button.jack;
+	struct snd_jack *btn_jack = btn->jack;
 
 	if (!btn_jack) {
 		dev_err_ratelimited(module->dev,
@@ -124,7 +125,7 @@ static int gbaudio_request_button(struct gbaudio_module_info *module,
 
 	module->button_status = report;
 
-	snd_soc_jack_report(&module->button_jack, report, module->button_mask);
+	snd_soc_jack_report(btn, report, module->button_mask);
 
 	return 0;
 }
@@ -258,6 +259,7 @@ static int gb_audio_probe(struct gb_bundle *bundle,
 	INIT_LIST_HEAD(&gbmodule->widget_list);
 	INIT_LIST_HEAD(&gbmodule->ctl_list);
 	INIT_LIST_HEAD(&gbmodule->widget_ctl_list);
+	INIT_LIST_HEAD(&gbmodule->jack_list);
 	gbmodule->dev = dev;
 	snprintf(gbmodule->name, NAME_SIZE, "%s.%s", dev->driver->name,
 		 dev_name(dev));
-- 
2.26.2

Re: [RESEND PATCH v1 2/6] staging: greybus: audio: Maintain jack list within GB Audio module

[Dan Carpenter]

On Tue, Jun 02, 2020 at 10:51:11AM +0530, Vaibhav Agarwal wrote:
> As per the current implementation for GB codec driver, a jack list is
> maintained for each module. And it expects the list to be populated by
> the snd_soc_jack structure which would require modifications in
> mainstream code.
> 
> However, this is not a necessary requirement and the list can be easily
> maintained within gbaudio_module_info as well. This patch provides the
> relevant changes for the same.
> 
> Signed-off-by: Vaibhav Agarwal <vaibhav.sr@gmail.com>
> ---
>  drivers/staging/greybus/audio_codec.c  | 76 ++++++++++++++------------
>  drivers/staging/greybus/audio_codec.h  | 10 +++-
>  drivers/staging/greybus/audio_module.c | 20 ++++---
>  3 files changed, 60 insertions(+), 46 deletions(-)
> 
> diff --git a/drivers/staging/greybus/audio_codec.c b/drivers/staging/greybus/audio_codec.c
> index ebf8484f0ae7..a2ee587e5a79 100644
> --- a/drivers/staging/greybus/audio_codec.c
> +++ b/drivers/staging/greybus/audio_codec.c
> @@ -712,7 +712,7 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
>  			     struct snd_soc_card *card)
>  {
>  	int ret;
> -
> +	struct gbaudio_jack *gba_jack, *n;
>  	struct snd_soc_jack *jack;

Because we got rid of the jack pointer then we can re-use the name here.

	struct gbaudio_jack *jack, *n;

We still don't want the "struct snd_soc_jack *jack;" pointer.

>  	struct snd_soc_jack_pin *headset, *button;
>  
> @@ -728,7 +728,8 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
>  
>  	headset->pin = module->jack_name;
>  	headset->mask = module->jack_mask;
> -	jack = &module->headset_jack;
> +	gba_jack = &module->headset;
> +	jack = &gba_jack->jack;

Use module->headset.jack directly.

>  
>  	ret = snd_soc_card_jack_new(card, module->jack_name, module->jack_mask,
>  				    jack, headset, 1);
> @@ -737,6 +738,9 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
>  		return ret;
>  	}
>  
> +	/* Add to module's jack list */
> +	list_add(&gba_jack->list, &module->jack_list);


Here as well.

> +
>  	if (!module->button_mask)
>  		return 0;
>  
> @@ -745,20 +749,24 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
>  	button = devm_kzalloc(module->dev, sizeof(*headset), GFP_KERNEL);
>  	if (!button) {
>  		ret = -ENOMEM;
> -		goto free_headset;
> +		goto free_jack;

Let's call the label "free_jacks" (plural).

>  	}
>  
>  	button->pin = module->button_name;
>  	button->mask = module->button_mask;
> -	jack = &module->button_jack;
> +	gba_jack = &module->button;
> +	jack = &gba_jack->jack;
>  
>  	ret = snd_soc_card_jack_new(card, module->button_name,
>  				    module->button_mask, jack, button, 1);
>  	if (ret) {
>  		dev_err(module->dev, "Failed to create button jack\n");
> -		goto free_headset;
> +		goto free_jack;
>  	}
>  
> +	/* Add to module's jack list */
> +	list_add(&gba_jack->list, &module->jack_list);
> +
>  	/*
>  	 * Currently, max 4 buttons are supported with following key mapping
>  	 * BTN_0 = KEY_MEDIA
> @@ -768,58 +776,55 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
>  	 */
>  
>  	if (module->button_mask & SND_JACK_BTN_0) {
> -		ret = snd_jack_set_key(module->button_jack.jack, SND_JACK_BTN_0,
> +		ret = snd_jack_set_key(jack->jack, SND_JACK_BTN_0,
>  				       KEY_MEDIA);
>  		if (ret) {
>  			dev_err(module->dev, "Failed to set BTN_0\n");
> -			goto free_button;
> +			goto free_jack;
>  		}
>  	}
>  
>  	if (module->button_mask & SND_JACK_BTN_1) {
> -		ret = snd_jack_set_key(module->button_jack.jack, SND_JACK_BTN_1,
> +		ret = snd_jack_set_key(jack->jack, SND_JACK_BTN_1,
>  				       KEY_VOICECOMMAND);
>  		if (ret) {
>  			dev_err(module->dev, "Failed to set BTN_1\n");
> -			goto free_button;
> +			goto free_jack;
>  		}
>  	}
>  
>  	if (module->button_mask & SND_JACK_BTN_2) {
> -		ret = snd_jack_set_key(module->button_jack.jack, SND_JACK_BTN_2,
> +		ret = snd_jack_set_key(jack->jack, SND_JACK_BTN_2,
>  				       KEY_VOLUMEUP);
>  		if (ret) {
>  			dev_err(module->dev, "Failed to set BTN_2\n");
> -			goto free_button;
> +			goto free_jack;
>  		}
>  	}
>  
>  	if (module->button_mask & SND_JACK_BTN_3) {
> -		ret = snd_jack_set_key(module->button_jack.jack, SND_JACK_BTN_3,
> +		ret = snd_jack_set_key(jack->jack, SND_JACK_BTN_3,
>  				       KEY_VOLUMEDOWN);
>  		if (ret) {
>  			dev_err(module->dev, "Failed to set BTN_0\n");
> -			goto free_button;
> +			goto free_jack;
>  		}
>  	}
>  
>  	/* FIXME
>  	 * verify if this is really required
>  	set_bit(INPUT_PROP_NO_DUMMY_RELEASE,
> -		module->button_jack.jack->input_dev->propbit);
> +		module->button->jack->jack->input_dev->propbit);
>  	*/
>  
>  	return 0;
>  
> -free_button:
> -	jack = &module->button_jack;
> -	snd_device_free(card->snd_card, jack->jack);
> -	list_del(&jack->list);
> -
> -free_headset:
> -	jack = &module->headset_jack;
> -	snd_device_free(card->snd_card, jack->jack);
> -	list_del(&jack->list);
> +free_jack:
> +	list_for_each_entry_safe(gba_jack, n, &module->jack_list, list) {
> +		jack = &gba_jack->jack;
> +		snd_device_free(card->snd_card, jack->jack);

Since we renamed "gba_jack" to "jack" then this becomes:

		snd_device_free(card->snd_card, jack->jack.jack);

Which is sort of weird, but still okay.

> +		list_del(&gba_jack->list);
> +	}
>  
>  	return ret;
>  }
> @@ -829,6 +834,7 @@ int gbaudio_register_module(struct gbaudio_module_info *module)
>  	int ret;
>  	struct snd_soc_codec *codec;
>  	struct snd_card *card;
> +	struct gbaudio_jack *gba_jack = NULL;

Don't introduce unused assignments.  It just silences static checker
warnings about uninitialized variables and introduces bugs.

Anyway, the same comments for the rest of the patch.  Please don't
introduce so many variables which aren't required and which hurt
grep-ability.

regards,
dan carpenter

[RESEND PATCH v1 3/6] staging: greybus: audio: Resolve compilation errors for GB codec module

[Vaibhav Agarwal]

Due to dependencies on ASoC framework changes, GB dummy codec module
compilation is currently disabled. This patch updates codec driver as
per the latest ASoC APIs.

Signed-off-by: Vaibhav Agarwal <vaibhav.sr@gmail.com>
---
 drivers/staging/greybus/audio_codec.c | 87 +++++++++++++--------------
 drivers/staging/greybus/audio_codec.h |  2 +-
 2 files changed, 44 insertions(+), 45 deletions(-)

diff --git a/drivers/staging/greybus/audio_codec.c b/drivers/staging/greybus/audio_codec.c
index a2ee587e5a79..bbd072acda5c 100644
--- a/drivers/staging/greybus/audio_codec.c
+++ b/drivers/staging/greybus/audio_codec.c
@@ -832,7 +832,7 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
 int gbaudio_register_module(struct gbaudio_module_info *module)
 {
 	int ret;
-	struct snd_soc_codec *codec;
+	struct snd_soc_component *component;
 	struct snd_card *card;
 	struct gbaudio_jack *gba_jack = NULL;
 	struct snd_soc_jack *jack = NULL;
@@ -842,8 +842,8 @@ int gbaudio_register_module(struct gbaudio_module_info *module)
 		return -EAGAIN;
 	}
 
-	codec = gbcodec->codec;
-	card = codec->card->snd_card;
+	component = gbcodec->component;
+	card = component->card->snd_card;
 
 	down_write(&card->controls_rwsem);
 
@@ -862,19 +862,20 @@ int gbaudio_register_module(struct gbaudio_module_info *module)
 	}
 
 	if (module->dapm_widgets)
-		snd_soc_dapm_new_controls(&codec->dapm, module->dapm_widgets,
+		snd_soc_dapm_new_controls(&component->dapm,
+					  module->dapm_widgets,
 					  module->num_dapm_widgets);
 	if (module->controls)
-		snd_soc_add_codec_controls(codec, module->controls,
-					   module->num_controls);
+		snd_soc_add_component_controls(component, module->controls,
+					       module->num_controls);
 	if (module->dapm_routes)
-		snd_soc_dapm_add_routes(&codec->dapm, module->dapm_routes,
+		snd_soc_dapm_add_routes(&component->dapm, module->dapm_routes,
 					module->num_dapm_routes);
 
 	/* card already instantiated, create widgets here only */
-	if (codec->card->instantiated) {
-		snd_soc_dapm_link_component_dai_widgets(codec->card,
-							&codec->dapm);
+	if (component->card->instantiated) {
+		snd_soc_dapm_link_component_dai_widgets(component->card,
+							&component->dapm);
 #ifdef CONFIG_SND_JACK
 		/*
 		 * register jack devices for this module
@@ -882,7 +883,7 @@ int gbaudio_register_module(struct gbaudio_module_info *module)
 		 */
 		list_for_each_entry(gba_jack, &module->jack_list, list) {
 			jack = &gba_jack->jack;
-			snd_device_register(codec->card->snd_card,
+			snd_device_register(component->card->snd_card,
 					    jack->jack);
 		}
 #endif
@@ -892,9 +893,9 @@ int gbaudio_register_module(struct gbaudio_module_info *module)
 	list_add(&module->list, &gbcodec->module_list);
 	mutex_unlock(&gbcodec->lock);
 
-	if (codec->card->instantiated)
-		ret = snd_soc_dapm_new_widgets(&codec->dapm);
-	dev_dbg(codec->dev, "Registered %s module\n", module->name);
+	if (component->card->instantiated)
+		ret = snd_soc_dapm_new_widgets(component->card);
+	dev_dbg(component->dev, "Registered %s module\n", module->name);
 
 	up_write(&card->controls_rwsem);
 	return ret;
@@ -965,19 +966,19 @@ static void gbaudio_codec_cleanup(struct gbaudio_module_info *module)
 
 void gbaudio_unregister_module(struct gbaudio_module_info *module)
 {
-	struct snd_soc_codec *codec = gbcodec->codec;
-	struct snd_card *card = codec->card->snd_card;
+	struct snd_soc_component *component = gbcodec->component;
+	struct snd_card *card = component->card->snd_card;
 	struct gbaudio_jack *gba_jack, *n;
 	struct snd_soc_jack *jack;
 	int mask;
 
-	dev_dbg(codec->dev, "Unregister %s module\n", module->name);
+	dev_dbg(component->dev, "Unregister %s module\n", module->name);
 
 	down_write(&card->controls_rwsem);
 	mutex_lock(&gbcodec->lock);
 	gbaudio_codec_cleanup(module);
 	list_del(&module->list);
-	dev_dbg(codec->dev, "Process Unregister %s module\n", module->name);
+	dev_dbg(component->dev, "Process Unregister %s module\n", module->name);
 	mutex_unlock(&gbcodec->lock);
 
 #ifdef CONFIG_SND_JACK
@@ -994,99 +995,97 @@ void gbaudio_unregister_module(struct gbaudio_module_info *module)
 			dev_dbg(module->dev, "Report %s removal\n",
 				jack->jack->id);
 			snd_soc_jack_report(jack, 0, mask);
-			snd_device_free(codec->card->snd_card, jack->jack);
+			snd_device_free(component->card->snd_card, jack->jack);
 			list_del(&gba_jack->list);
 		}
 	}
 #endif
 
 	if (module->dapm_routes) {
-		dev_dbg(codec->dev, "Removing %d routes\n",
+		dev_dbg(component->dev, "Removing %d routes\n",
 			module->num_dapm_routes);
-		snd_soc_dapm_del_routes(&codec->dapm, module->dapm_routes,
+		snd_soc_dapm_del_routes(&component->dapm, module->dapm_routes,
 					module->num_dapm_routes);
 	}
 	if (module->controls) {
-		dev_dbg(codec->dev, "Removing %d controls\n",
+		dev_dbg(component->dev, "Removing %d controls\n",
 			module->num_controls);
-		snd_soc_remove_codec_controls(codec, module->controls,
+		snd_soc_remove_codec_controls(component, module->controls,
 					      module->num_controls);
 	}
 	if (module->dapm_widgets) {
-		dev_dbg(codec->dev, "Removing %d widgets\n",
+		dev_dbg(component->dev, "Removing %d widgets\n",
 			module->num_dapm_widgets);
-		snd_soc_dapm_free_controls(&codec->dapm, module->dapm_widgets,
+		snd_soc_dapm_free_controls(&component->dapm,
+					   module->dapm_widgets,
 					   module->num_dapm_widgets);
 	}
 
-	dev_dbg(codec->dev, "Unregistered %s module\n", module->name);
+	dev_dbg(component->dev, "Unregistered %s module\n", module->name);
 
 	up_write(&card->controls_rwsem);
 }
 EXPORT_SYMBOL(gbaudio_unregister_module);
 
 /*
- * codec driver ops
+ * component driver ops
  */
-static int gbcodec_probe(struct snd_soc_codec *codec)
+static int gbcodec_probe(struct snd_soc_component *component)
 {
 	int i;
 	struct gbaudio_codec_info *info;
 	struct gbaudio_codec_dai *dai;
 
-	info = devm_kzalloc(codec->dev, sizeof(*info), GFP_KERNEL);
+	info = devm_kzalloc(component->dev, sizeof(*info), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;
 
-	info->dev = codec->dev;
+	info->dev = component->dev;
 	INIT_LIST_HEAD(&info->module_list);
 	mutex_init(&info->lock);
 	INIT_LIST_HEAD(&info->dai_list);
 
 	/* init dai_list used to maintain runtime stream info */
 	for (i = 0; i < ARRAY_SIZE(gbaudio_dai); i++) {
-		dai = devm_kzalloc(codec->dev, sizeof(*dai), GFP_KERNEL);
+		dai = devm_kzalloc(component->dev, sizeof(*dai), GFP_KERNEL);
 		if (!dai)
 			return -ENOMEM;
 		dai->id = gbaudio_dai[i].id;
 		list_add(&dai->list, &info->dai_list);
 	}
 
-	info->codec = codec;
-	snd_soc_codec_set_drvdata(codec, info);
+	info->component = component;
+	snd_soc_component_set_drvdata(component, info);
 	gbcodec = info;
 
-	device_init_wakeup(codec->dev, 1);
+	device_init_wakeup(component->dev, 1);
 	return 0;
 }
 
-static int gbcodec_remove(struct snd_soc_codec *codec)
+static void gbcodec_remove(struct snd_soc_component *component)
 {
 	/* Empty function for now */
-	return 0;
+	return;
 }
 
-static int gbcodec_write(struct snd_soc_codec *codec, unsigned int reg,
+static int gbcodec_write(struct snd_soc_component *component, unsigned int reg,
 			 unsigned int value)
 {
 	return 0;
 }
 
-static unsigned int gbcodec_read(struct snd_soc_codec *codec,
+static unsigned int gbcodec_read(struct snd_soc_component *component,
 				 unsigned int reg)
 {
 	return 0;
 }
 
-static struct snd_soc_codec_driver soc_codec_dev_gbaudio = {
+static const struct snd_soc_component_driver soc_codec_dev_gbaudio = {
 	.probe	= gbcodec_probe,
 	.remove	= gbcodec_remove,
 
 	.read = gbcodec_read,
 	.write = gbcodec_write,
-
-	.idle_bias_off = true,
-	.ignore_pmdown_time = 1,
 };
 
 #ifdef CONFIG_PM
@@ -1110,13 +1109,13 @@ static const struct dev_pm_ops gbaudio_codec_pm_ops = {
 
 static int gbaudio_codec_probe(struct platform_device *pdev)
 {
-	return snd_soc_register_codec(&pdev->dev, &soc_codec_dev_gbaudio,
+	return devm_snd_soc_register_component(&pdev->dev,
+			&soc_codec_dev_gbaudio,
 			gbaudio_dai, ARRAY_SIZE(gbaudio_dai));
 }
 
 static int gbaudio_codec_remove(struct platform_device *pdev)
 {
-	snd_soc_unregister_codec(&pdev->dev);
 	return 0;
 }
 
diff --git a/drivers/staging/greybus/audio_codec.h b/drivers/staging/greybus/audio_codec.h
index af9195eceb3a..ce15e800e607 100644
--- a/drivers/staging/greybus/audio_codec.h
+++ b/drivers/staging/greybus/audio_codec.h
@@ -66,7 +66,7 @@ struct gbaudio_codec_dai {
 
 struct gbaudio_codec_info {
 	struct device *dev;
-	struct snd_soc_codec *codec;
+	struct snd_soc_component *component;
 	struct list_head module_list;
 	/* to maintain runtime stream params for each DAI */
 	struct list_head dai_list;
-- 
2.26.2

Re: [RESEND PATCH v1 3/6] staging: greybus: audio: Resolve compilation errors for GB codec module

[Dan Carpenter]

On Tue, Jun 02, 2020 at 10:51:12AM +0530, Vaibhav Agarwal wrote:
> Due to dependencies on ASoC framework changes, GB dummy codec module
> compilation is currently disabled. This patch updates codec driver as
> per the latest ASoC APIs.
> 
> Signed-off-by: Vaibhav Agarwal <vaibhav.sr@gmail.com>
> ---
>  drivers/staging/greybus/audio_codec.c | 87 +++++++++++++--------------
>  drivers/staging/greybus/audio_codec.h |  2 +-
>  2 files changed, 44 insertions(+), 45 deletions(-)
> 
> diff --git a/drivers/staging/greybus/audio_codec.c b/drivers/staging/greybus/audio_codec.c
> index a2ee587e5a79..bbd072acda5c 100644
> --- a/drivers/staging/greybus/audio_codec.c
> +++ b/drivers/staging/greybus/audio_codec.c
> @@ -832,7 +832,7 @@ static int gbaudio_init_jack(struct gbaudio_module_info *module,
>  int gbaudio_register_module(struct gbaudio_module_info *module)
>  {
>  	int ret;
> -	struct snd_soc_codec *codec;
> +	struct snd_soc_component *component;

I quite like the "component" pointer because it's assigned once at the
start of the function and used consistently throughout.  The other
pointers I complained about were just temporary pointers which meant
different things depending on which line you were on.  They made the
code harder to read.

My only quible is that in the next patch it's called "comp" and here
it's called "component".  Let's just use "comp" for all the local
variables.


regards,
dan carpenter

[RESEND PATCH v1 4/6] staging: greybus: audio: Resolve compilation error in topology parser

[Vaibhav Agarwal]

Fix compilation errors for GB Audio topology parser code with recent
kernel versions.

Signed-off-by: Vaibhav Agarwal <vaibhav.sr@gmail.com>
---
 drivers/staging/greybus/audio_topology.c | 130 +++++++++++------------
 1 file changed, 61 insertions(+), 69 deletions(-)

diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c
index 4ac30accf226..7d5e87341a5c 100644
--- a/drivers/staging/greybus/audio_topology.c
+++ b/drivers/staging/greybus/audio_topology.c
@@ -5,8 +5,8 @@
  * Copyright 2015-2016 Linaro Ltd.
  */
 
+#include <linux/greybus.h>
 #include "audio_codec.h"
-#include "greybus_protocols.h"
 
 #define GBAUDIO_INVALID_ID	0xFF
 
@@ -165,15 +165,15 @@ static int gbcodec_mixer_ctl_info(struct snd_kcontrol *kcontrol,
 	struct gbaudio_ctl_pvt *data;
 	struct gb_audio_ctl_elem_info *info;
 	struct gbaudio_module_info *module;
-	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
-	struct gbaudio_codec_info *gbcodec = snd_soc_codec_get_drvdata(codec);
+	struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
+	struct gbaudio_codec_info *gb = snd_soc_component_get_drvdata(comp);
 
-	dev_dbg(codec->dev, "Entered %s:%s\n", __func__, kcontrol->id.name);
+	dev_dbg(comp->dev, "Entered %s:%s\n", __func__, kcontrol->id.name);
 	data = (struct gbaudio_ctl_pvt *)kcontrol->private_value;
 	info = (struct gb_audio_ctl_elem_info *)data->info;
 
 	if (!info) {
-		dev_err(codec->dev, "NULL info for %s\n", uinfo->id.name);
+		dev_err(comp->dev, "NULL info for %s\n", uinfo->id.name);
 		return -EINVAL;
 	}
 
@@ -193,7 +193,7 @@ static int gbcodec_mixer_ctl_info(struct snd_kcontrol *kcontrol,
 		uinfo->value.enumerated.items = max;
 		if (uinfo->value.enumerated.item > max - 1)
 			uinfo->value.enumerated.item = max - 1;
-		module = find_gb_module(gbcodec, kcontrol->id.name);
+		module = find_gb_module(gb, kcontrol->id.name);
 		if (!module)
 			return -EINVAL;
 		name = gbaudio_map_controlid(module, data->ctl_id,
@@ -201,7 +201,7 @@ static int gbcodec_mixer_ctl_info(struct snd_kcontrol *kcontrol,
 		strlcpy(uinfo->value.enumerated.name, name, NAME_SIZE);
 		break;
 	default:
-		dev_err(codec->dev, "Invalid type: %d for %s:kcontrol\n",
+		dev_err(comp->dev, "Invalid type: %d for %s:kcontrol\n",
 			info->type, kcontrol->id.name);
 		break;
 	}
@@ -216,11 +216,11 @@ static int gbcodec_mixer_ctl_get(struct snd_kcontrol *kcontrol,
 	struct gbaudio_ctl_pvt *data;
 	struct gb_audio_ctl_elem_value gbvalue;
 	struct gbaudio_module_info *module;
-	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
-	struct gbaudio_codec_info *gb = snd_soc_codec_get_drvdata(codec);
+	struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
+	struct gbaudio_codec_info *gb = snd_soc_component_get_drvdata(comp);
 	struct gb_bundle *bundle;
 
-	dev_dbg(codec->dev, "Entered %s:%s\n", __func__, kcontrol->id.name);
+	dev_dbg(comp->dev, "Entered %s:%s\n", __func__, kcontrol->id.name);
 	module = find_gb_module(gb, kcontrol->id.name);
 	if (!module)
 		return -EINVAL;
@@ -239,7 +239,7 @@ static int gbcodec_mixer_ctl_get(struct snd_kcontrol *kcontrol,
 	gb_pm_runtime_put_autosuspend(bundle);
 
 	if (ret) {
-		dev_err_ratelimited(codec->dev, "%d:Error in %s for %s\n", ret,
+		dev_err_ratelimited(comp->dev, "%d:Error in %s for %s\n", ret,
 				    __func__, kcontrol->id.name);
 		return ret;
 	}
@@ -262,7 +262,7 @@ static int gbcodec_mixer_ctl_get(struct snd_kcontrol *kcontrol,
 				le32_to_cpu(gbvalue.value.enumerated_item[1]);
 		break;
 	default:
-		dev_err(codec->dev, "Invalid type: %d for %s:kcontrol\n",
+		dev_err(comp->dev, "Invalid type: %d for %s:kcontrol\n",
 			info->type, kcontrol->id.name);
 		ret = -EINVAL;
 		break;
@@ -278,11 +278,11 @@ static int gbcodec_mixer_ctl_put(struct snd_kcontrol *kcontrol,
 	struct gbaudio_ctl_pvt *data;
 	struct gb_audio_ctl_elem_value gbvalue;
 	struct gbaudio_module_info *module;
-	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
-	struct gbaudio_codec_info *gb = snd_soc_codec_get_drvdata(codec);
+	struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
+	struct gbaudio_codec_info *gb = snd_soc_component_get_drvdata(comp);
 	struct gb_bundle *bundle;
 
-	dev_dbg(codec->dev, "Entered %s:%s\n", __func__, kcontrol->id.name);
+	dev_dbg(comp->dev, "Entered %s:%s\n", __func__, kcontrol->id.name);
 	module = find_gb_module(gb, kcontrol->id.name);
 	if (!module)
 		return -EINVAL;
@@ -309,7 +309,7 @@ static int gbcodec_mixer_ctl_put(struct snd_kcontrol *kcontrol,
 				cpu_to_le32(ucontrol->value.enumerated.item[1]);
 		break;
 	default:
-		dev_err(codec->dev, "Invalid type: %d for %s:kcontrol\n",
+		dev_err(comp->dev, "Invalid type: %d for %s:kcontrol\n",
 			info->type, kcontrol->id.name);
 		ret = -EINVAL;
 		break;
@@ -328,7 +328,7 @@ static int gbcodec_mixer_ctl_put(struct snd_kcontrol *kcontrol,
 	gb_pm_runtime_put_autosuspend(bundle);
 
 	if (ret) {
-		dev_err_ratelimited(codec->dev, "%d:Error in %s for %s\n", ret,
+		dev_err_ratelimited(comp->dev, "%d:Error in %s for %s\n", ret,
 				    __func__, kcontrol->id.name);
 	}
 
@@ -352,11 +352,7 @@ static int gbcodec_mixer_dapm_ctl_info(struct snd_kcontrol *kcontrol,
 	int platform_max, platform_min;
 	struct gbaudio_ctl_pvt *data;
 	struct gb_audio_ctl_elem_info *info;
-	struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
-	struct snd_soc_dapm_widget *widget = wlist->widgets[0];
-	struct snd_soc_codec *codec = widget->codec;
 
-	dev_dbg(codec->dev, "Entered %s:%s\n", __func__, kcontrol->id.name);
 	data = (struct gbaudio_ctl_pvt *)kcontrol->private_value;
 	info = (struct gb_audio_ctl_elem_info *)data->info;
 
@@ -387,11 +383,11 @@ static int gbcodec_mixer_dapm_ctl_get(struct snd_kcontrol *kcontrol,
 	struct gbaudio_module_info *module;
 	struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
 	struct snd_soc_dapm_widget *widget = wlist->widgets[0];
-	struct snd_soc_codec *codec = widget->codec;
-	struct gbaudio_codec_info *gb = snd_soc_codec_get_drvdata(codec);
+	struct device *codec_dev = widget->dapm->dev;
+	struct gbaudio_codec_info *gb = dev_get_drvdata(codec_dev);
 	struct gb_bundle *bundle;
 
-	dev_dbg(codec->dev, "Entered %s:%s\n", __func__, kcontrol->id.name);
+	dev_dbg(codec_dev, "Entered %s:%s\n", __func__, kcontrol->id.name);
 	module = find_gb_module(gb, kcontrol->id.name);
 	if (!module)
 		return -EINVAL;
@@ -415,7 +411,7 @@ static int gbcodec_mixer_dapm_ctl_get(struct snd_kcontrol *kcontrol,
 	gb_pm_runtime_put_autosuspend(bundle);
 
 	if (ret) {
-		dev_err_ratelimited(codec->dev, "%d:Error in %s for %s\n", ret,
+		dev_err_ratelimited(codec_dev, "%d:Error in %s for %s\n", ret,
 				    __func__, kcontrol->id.name);
 		return ret;
 	}
@@ -429,7 +425,7 @@ static int gbcodec_mixer_dapm_ctl_get(struct snd_kcontrol *kcontrol,
 static int gbcodec_mixer_dapm_ctl_put(struct snd_kcontrol *kcontrol,
 				      struct snd_ctl_elem_value *ucontrol)
 {
-	int ret, wi, max, connect;
+	int ret, wi, max;
 	unsigned int mask, val;
 	struct gb_audio_ctl_elem_info *info;
 	struct gbaudio_ctl_pvt *data;
@@ -437,11 +433,12 @@ static int gbcodec_mixer_dapm_ctl_put(struct snd_kcontrol *kcontrol,
 	struct gbaudio_module_info *module;
 	struct snd_soc_dapm_widget_list *wlist = snd_kcontrol_chip(kcontrol);
 	struct snd_soc_dapm_widget *widget = wlist->widgets[0];
-	struct snd_soc_codec *codec = widget->codec;
-	struct gbaudio_codec_info *gb = snd_soc_codec_get_drvdata(codec);
+	struct device *codec_dev = widget->dapm->dev;
+	struct gbaudio_codec_info *gb = dev_get_drvdata(codec_dev);
+	struct snd_soc_dapm_update *update = NULL;
 	struct gb_bundle *bundle;
 
-	dev_dbg(codec->dev, "Entered %s:%s\n", __func__, kcontrol->id.name);
+	dev_dbg(codec_dev, "Entered %s:%s\n", __func__, kcontrol->id.name);
 	module = find_gb_module(gb, kcontrol->id.name);
 	if (!module)
 		return -EINVAL;
@@ -458,17 +455,13 @@ static int gbcodec_mixer_dapm_ctl_put(struct snd_kcontrol *kcontrol,
 	max = le32_to_cpu(info->value.integer.max);
 	mask = (1 << fls(max)) - 1;
 	val = ucontrol->value.integer.value[0] & mask;
-	connect = !!val;
 
 	/* update ucontrol */
 	if (gbvalue.value.integer_value[0] != val) {
 		for (wi = 0; wi < wlist->num_widgets; wi++) {
 			widget = wlist->widgets[wi];
-
-			widget->value = val;
-			widget->dapm->update = NULL;
-			snd_soc_dapm_mixer_update_power(widget, kcontrol,
-							connect);
+			snd_soc_dapm_mixer_update_power(widget->dapm, kcontrol,
+							val, update);
 		}
 		gbvalue.value.integer_value[0] =
 			cpu_to_le32(ucontrol->value.integer.value[0]);
@@ -484,7 +477,7 @@ static int gbcodec_mixer_dapm_ctl_put(struct snd_kcontrol *kcontrol,
 		gb_pm_runtime_put_autosuspend(bundle);
 
 		if (ret) {
-			dev_err_ratelimited(codec->dev,
+			dev_err_ratelimited(codec_dev,
 					    "%d:Error in %s for %s\n", ret,
 					    __func__, kcontrol->id.name);
 			return ret;
@@ -553,11 +546,11 @@ static int gbcodec_enum_ctl_get(struct snd_kcontrol *kcontrol,
 				struct snd_ctl_elem_value *ucontrol)
 {
 	int ret, ctl_id;
-	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+	struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
+	struct gbaudio_codec_info *gb = snd_soc_component_get_drvdata(comp);
 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
 	struct gb_audio_ctl_elem_value gbvalue;
 	struct gbaudio_module_info *module;
-	struct gbaudio_codec_info *gb = snd_soc_codec_get_drvdata(codec);
 	struct gb_bundle *bundle;
 
 	module = find_gb_module(gb, kcontrol->id.name);
@@ -580,7 +573,7 @@ static int gbcodec_enum_ctl_get(struct snd_kcontrol *kcontrol,
 	gb_pm_runtime_put_autosuspend(bundle);
 
 	if (ret) {
-		dev_err_ratelimited(codec->dev, "%d:Error in %s for %s\n", ret,
+		dev_err_ratelimited(comp->dev, "%d:Error in %s for %s\n", ret,
 				    __func__, kcontrol->id.name);
 		return ret;
 	}
@@ -598,11 +591,11 @@ static int gbcodec_enum_ctl_put(struct snd_kcontrol *kcontrol,
 				struct snd_ctl_elem_value *ucontrol)
 {
 	int ret, ctl_id;
-	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
+	struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
+	struct gbaudio_codec_info *gb = snd_soc_component_get_drvdata(comp);
 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
 	struct gb_audio_ctl_elem_value gbvalue;
 	struct gbaudio_module_info *module;
-	struct gbaudio_codec_info *gb = snd_soc_codec_get_drvdata(codec);
 	struct gb_bundle *bundle;
 
 	module = find_gb_module(gb, kcontrol->id.name);
@@ -613,13 +606,13 @@ static int gbcodec_enum_ctl_put(struct snd_kcontrol *kcontrol,
 	if (ctl_id < 0)
 		return -EINVAL;
 
-	if (ucontrol->value.enumerated.item[0] > e->max - 1)
+	if (ucontrol->value.enumerated.item[0] > e->items - 1)
 		return -EINVAL;
 	gbvalue.value.enumerated_item[0] =
 		cpu_to_le32(ucontrol->value.enumerated.item[0]);
 
 	if (e->shift_l != e->shift_r) {
-		if (ucontrol->value.enumerated.item[1] > e->max - 1)
+		if (ucontrol->value.enumerated.item[1] > e->items - 1)
 			return -EINVAL;
 		gbvalue.value.enumerated_item[1] =
 			cpu_to_le32(ucontrol->value.enumerated.item[1]);
@@ -637,8 +630,8 @@ static int gbcodec_enum_ctl_put(struct snd_kcontrol *kcontrol,
 	gb_pm_runtime_put_autosuspend(bundle);
 
 	if (ret) {
-		dev_err_ratelimited(codec->dev, "%d:Error in %s for %s\n", ret,
-				    __func__, kcontrol->id.name);
+		dev_err_ratelimited(comp->dev, "%d:Error in %s for %s\n",
+				    ret, __func__, kcontrol->id.name);
 	}
 
 	return ret;
@@ -659,13 +652,13 @@ static int gbaudio_tplg_create_enum_kctl(struct gbaudio_module_info *gb,
 	gb_enum = &ctl->info.value.enumerated;
 
 	/* since count=1, and reg is dummy */
-	gbe->max = le32_to_cpu(gb_enum->items);
+	gbe->items = le32_to_cpu(gb_enum->items);
 	gbe->texts = gb_generate_enum_strings(gb, gb_enum);
 
 	/* debug enum info */
-	dev_dbg(gb->dev, "Max:%d, name_length:%d\n", gbe->max,
+	dev_dbg(gb->dev, "Max:%d, name_length:%d\n", gbe->items,
 		le16_to_cpu(gb_enum->names_length));
-	for (i = 0; i < gbe->max; i++)
+	for (i = 0; i < gbe->items; i++)
 		dev_dbg(gb->dev, "src[%d]: %s\n", i, gbe->texts[i]);
 
 	*kctl = (struct snd_kcontrol_new)
@@ -720,8 +713,8 @@ static int gbcodec_enum_dapm_ctl_get(struct snd_kcontrol *kcontrol,
 	struct snd_soc_dapm_widget *widget = wlist->widgets[0];
 	struct gbaudio_module_info *module;
 	struct gb_audio_ctl_elem_value gbvalue;
-	struct snd_soc_codec *codec = widget->codec;
-	struct gbaudio_codec_info *gb = snd_soc_codec_get_drvdata(codec);
+	struct device *codec_dev = widget->dapm->dev;
+	struct gbaudio_codec_info *gb = dev_get_drvdata(codec_dev);
 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
 	struct gb_bundle *bundle;
 
@@ -745,7 +738,7 @@ static int gbcodec_enum_dapm_ctl_get(struct snd_kcontrol *kcontrol,
 	gb_pm_runtime_put_autosuspend(bundle);
 
 	if (ret) {
-		dev_err_ratelimited(codec->dev, "%d:Error in %s for %s\n", ret,
+		dev_err_ratelimited(codec_dev, "%d:Error in %s for %s\n", ret,
 				    __func__, kcontrol->id.name);
 		return ret;
 	}
@@ -768,12 +761,13 @@ static int gbcodec_enum_dapm_ctl_put(struct snd_kcontrol *kcontrol,
 	struct snd_soc_dapm_widget *widget = wlist->widgets[0];
 	struct gb_audio_ctl_elem_value gbvalue;
 	struct gbaudio_module_info *module;
-	struct snd_soc_codec *codec = widget->codec;
-	struct gbaudio_codec_info *gb = snd_soc_codec_get_drvdata(codec);
+	struct device *codec_dev = widget->dapm->dev;
+	struct gbaudio_codec_info *gb = dev_get_drvdata(codec_dev);
 	struct soc_enum *e = (struct soc_enum *)kcontrol->private_value;
 	struct gb_bundle *bundle;
+	struct snd_soc_dapm_update *update = NULL;
 
-	if (ucontrol->value.enumerated.item[0] > e->max - 1)
+	if (ucontrol->value.enumerated.item[0] > e->items - 1)
 		return -EINVAL;
 
 	module = find_gb_module(gb, kcontrol->id.name);
@@ -797,7 +791,7 @@ static int gbcodec_enum_dapm_ctl_put(struct snd_kcontrol *kcontrol,
 	gb_pm_runtime_put_autosuspend(bundle);
 
 	if (ret) {
-		dev_err_ratelimited(codec->dev, "%d:Error in %s for %s\n", ret,
+		dev_err_ratelimited(codec_dev, "%d:Error in %s for %s\n", ret,
 				    __func__, kcontrol->id.name);
 		return ret;
 	}
@@ -814,7 +808,7 @@ static int gbcodec_enum_dapm_ctl_put(struct snd_kcontrol *kcontrol,
 	}
 
 	if (e->shift_l != e->shift_r) {
-		if (ucontrol->value.enumerated.item[1] > e->max - 1)
+		if (ucontrol->value.enumerated.item[1] > e->items - 1)
 			return -EINVAL;
 		val |= ucontrol->value.enumerated.item[1] << e->shift_r;
 		mask |= e->mask << e->shift_r;
@@ -837,16 +831,14 @@ static int gbcodec_enum_dapm_ctl_put(struct snd_kcontrol *kcontrol,
 		gb_pm_runtime_put_autosuspend(bundle);
 
 		if (ret) {
-			dev_err_ratelimited(codec->dev,
+			dev_err_ratelimited(codec_dev,
 					    "%d:Error in %s for %s\n", ret,
 					    __func__, kcontrol->id.name);
 		}
 		for (wi = 0; wi < wlist->num_widgets; wi++) {
 			widget = wlist->widgets[wi];
-
-			widget->value = val;
-			widget->dapm->update = NULL;
-			snd_soc_dapm_mux_update_power(widget, kcontrol, mux, e);
+			snd_soc_dapm_mux_update_power(widget->dapm, kcontrol,
+						      val, e, update);
 		}
 	}
 
@@ -868,13 +860,13 @@ static int gbaudio_tplg_create_enum_ctl(struct gbaudio_module_info *gb,
 	gb_enum = &ctl->info.value.enumerated;
 
 	/* since count=1, and reg is dummy */
-	gbe->max = le32_to_cpu(gb_enum->items);
+	gbe->items = le32_to_cpu(gb_enum->items);
 	gbe->texts = gb_generate_enum_strings(gb, gb_enum);
 
 	/* debug enum info */
-	dev_dbg(gb->dev, "Max:%d, name_length:%d\n", gbe->max,
+	dev_dbg(gb->dev, "Max:%d, name_length:%d\n", gbe->items,
 		le16_to_cpu(gb_enum->names_length));
-	for (i = 0; i < gbe->max; i++)
+	for (i = 0; i < gbe->items; i++)
 		dev_dbg(gb->dev, "src[%d]: %s\n", i, gbe->texts[i]);
 
 	*kctl = (struct snd_kcontrol_new)
@@ -935,12 +927,12 @@ static int gbaudio_widget_event(struct snd_soc_dapm_widget *w,
 {
 	int wid;
 	int ret;
-	struct snd_soc_codec *codec = w->codec;
-	struct gbaudio_codec_info *gbcodec = snd_soc_codec_get_drvdata(codec);
+	struct device *codec_dev = w->dapm->dev;
+	struct gbaudio_codec_info *gbcodec = dev_get_drvdata(codec_dev);
 	struct gbaudio_module_info *module;
 	struct gb_bundle *bundle;
 
-	dev_dbg(codec->dev, "%s %s %d\n", __func__, w->name, event);
+	dev_dbg(codec_dev, "%s %s %d\n", __func__, w->name, event);
 
 	/* Find relevant module */
 	module = find_gb_module(gbcodec, w->name);
@@ -950,7 +942,7 @@ static int gbaudio_widget_event(struct snd_soc_dapm_widget *w,
 	/* map name to widget id */
 	wid = gbaudio_map_widgetname(module, w->name);
 	if (wid < 0) {
-		dev_err(codec->dev, "Invalid widget name:%s\n", w->name);
+		dev_err(codec_dev, "Invalid widget name:%s\n", w->name);
 		return -EINVAL;
 	}
 
@@ -973,7 +965,7 @@ static int gbaudio_widget_event(struct snd_soc_dapm_widget *w,
 		break;
 	}
 	if (ret)
-		dev_err_ratelimited(codec->dev,
+		dev_err_ratelimited(codec_dev,
 				    "%d: widget, event:%d failed:%d\n", wid,
 				    event, ret);
 
-- 
2.26.2

Re: [RESEND PATCH v1 4/6] staging: greybus: audio: Resolve compilation error in topology parser

[Dan Carpenter]

On Tue, Jun 02, 2020 at 10:51:13AM +0530, Vaibhav Agarwal wrote:
> Fix compilation errors for GB Audio topology parser code with recent
> kernel versions.
> 
> Signed-off-by: Vaibhav Agarwal <vaibhav.sr@gmail.com>
> ---
>  drivers/staging/greybus/audio_topology.c | 130 +++++++++++------------
>  1 file changed, 61 insertions(+), 69 deletions(-)
> 
> diff --git a/drivers/staging/greybus/audio_topology.c b/drivers/staging/greybus/audio_topology.c
> index 4ac30accf226..7d5e87341a5c 100644
> --- a/drivers/staging/greybus/audio_topology.c
> +++ b/drivers/staging/greybus/audio_topology.c
> @@ -5,8 +5,8 @@
>   * Copyright 2015-2016 Linaro Ltd.
>   */
>  
> +#include <linux/greybus.h>
>  #include "audio_codec.h"
> -#include "greybus_protocols.h"
>  
>  #define GBAUDIO_INVALID_ID	0xFF
>  
> @@ -165,15 +165,15 @@ static int gbcodec_mixer_ctl_info(struct snd_kcontrol *kcontrol,
>  	struct gbaudio_ctl_pvt *data;
>  	struct gb_audio_ctl_elem_info *info;
>  	struct gbaudio_module_info *module;
> -	struct snd_soc_codec *codec = snd_kcontrol_chip(kcontrol);
> -	struct gbaudio_codec_info *gbcodec = snd_soc_codec_get_drvdata(codec);
> +	struct snd_soc_component *comp = snd_soc_kcontrol_component(kcontrol);
> +	struct gbaudio_codec_info *gb = snd_soc_component_get_drvdata(comp);

Please rename "gbcodec" in a different patch.  It's not related to
fixing the compile.

Otherwise it seems okay.

regards,
dan carpenter

[RESEND PATCH v1 5/6] staging: greybus: audio: Add helper APIs for dynamic audio modules

[Vaibhav Agarwal]

Greybus Codec driver allows modules to be dynamically added and removed,
which further requires updating the DAPM configurations as well.

With current snd_soc architecture, dynamic audio modules is not yet
supported. This patch provides helper APIs to update DAPM configurations
in response to modules which are dynamically added or removed. The
source is primarily based on snd_dapm.c

Signed-off-by: Vaibhav Agarwal <vaibhav.sr@gmail.com>
---
 drivers/staging/greybus/Makefile       |   2 +-
 drivers/staging/greybus/audio_codec.c  |  13 +-
 drivers/staging/greybus/audio_helper.c | 197 +++++++++++++++++++++++++
 drivers/staging/greybus/audio_helper.h |  17 +++
 4 files changed, 224 insertions(+), 5 deletions(-)
 create mode 100644 drivers/staging/greybus/audio_helper.c
 create mode 100644 drivers/staging/greybus/audio_helper.h

diff --git a/drivers/staging/greybus/Makefile b/drivers/staging/greybus/Makefile
index 627e44f2a983..3b4b6cabff19 100644
--- a/drivers/staging/greybus/Makefile
+++ b/drivers/staging/greybus/Makefile
@@ -28,7 +28,7 @@ obj-$(CONFIG_GREYBUS_VIBRATOR)	+= gb-vibrator.o
 
 # Greybus Audio is a bunch of modules
 gb-audio-module-y	:= audio_module.o audio_topology.o
-gb-audio-codec-y	:= audio_codec.o
+gb-audio-codec-y	:= audio_codec.o audio_helper.o
 gb-audio-gb-y		:= audio_gb.o
 gb-audio-apbridgea-y	:= audio_apbridgea.o
 gb-audio-manager-y	:= audio_manager.o audio_manager_module.o
diff --git a/drivers/staging/greybus/audio_codec.c b/drivers/staging/greybus/audio_codec.c
index bbd072acda5c..866b3342515f 100644
--- a/drivers/staging/greybus/audio_codec.c
+++ b/drivers/staging/greybus/audio_codec.c
@@ -14,6 +14,7 @@
 #include "audio_codec.h"
 #include "audio_apbridgea.h"
 #include "audio_manager.h"
+#include "audio_helper.h"
 
 static struct gbaudio_codec_info *gbcodec;
 
@@ -874,7 +875,7 @@ int gbaudio_register_module(struct gbaudio_module_info *module)
 
 	/* card already instantiated, create widgets here only */
 	if (component->card->instantiated) {
-		snd_soc_dapm_link_component_dai_widgets(component->card,
+		gbaudio_dapm_link_component_dai_widgets(component->card,
 							&component->dapm);
 #ifdef CONFIG_SND_JACK
 		/*
@@ -1004,19 +1005,23 @@ void gbaudio_unregister_module(struct gbaudio_module_info *module)
 	if (module->dapm_routes) {
 		dev_dbg(component->dev, "Removing %d routes\n",
 			module->num_dapm_routes);
+		/* verify routes with controls are removed */
 		snd_soc_dapm_del_routes(&component->dapm, module->dapm_routes,
 					module->num_dapm_routes);
 	}
 	if (module->controls) {
 		dev_dbg(component->dev, "Removing %d controls\n",
 			module->num_controls);
-		snd_soc_remove_codec_controls(component, module->controls,
-					      module->num_controls);
+		/* release control semaphore */
+		up_write(&card->controls_rwsem);
+		gbaudio_remove_component_controls(component, module->controls,
+						  module->num_controls);
+		down_write(&card->controls_rwsem);
 	}
 	if (module->dapm_widgets) {
 		dev_dbg(component->dev, "Removing %d widgets\n",
 			module->num_dapm_widgets);
-		snd_soc_dapm_free_controls(&component->dapm,
+		gbaudio_dapm_free_controls(&component->dapm,
 					   module->dapm_widgets,
 					   module->num_dapm_widgets);
 	}
diff --git a/drivers/staging/greybus/audio_helper.c b/drivers/staging/greybus/audio_helper.c
new file mode 100644
index 000000000000..e2f113a811ee
--- /dev/null
+++ b/drivers/staging/greybus/audio_helper.c
@@ -0,0 +1,197 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Greybus Audio Sound SoC helper APIs
+ */
+
+#include <linux/debugfs.h>
+#include <sound/core.h>
+#include <sound/soc.h>
+#include <sound/soc-dapm.h>
+
+#define gbaudio_dapm_for_each_direction(dir) \
+	for ((dir) = SND_SOC_DAPM_DIR_IN; (dir) <= SND_SOC_DAPM_DIR_OUT; \
+		(dir)++)
+
+static void gbaudio_dapm_link_dai_widget(struct snd_soc_dapm_widget *dai_w,
+					 struct snd_soc_card *card)
+{
+	struct snd_soc_dapm_widget *w;
+	struct snd_soc_dapm_widget *src, *sink;
+	struct snd_soc_dai *dai = dai_w->priv;
+
+	/* ...find all widgets with the same stream and link them */
+	list_for_each_entry(w, &card->widgets, list) {
+		if (w->dapm != dai_w->dapm)
+			continue;
+
+		switch (w->id) {
+		case snd_soc_dapm_dai_in:
+		case snd_soc_dapm_dai_out:
+			continue;
+		default:
+			break;
+		}
+
+		if (!w->sname || !strstr(w->sname, dai_w->sname))
+			continue;
+
+		/*
+		 * check if widget is already linked,
+		 * if (w->linked)
+		 *	return;
+		 */
+
+		if (dai_w->id == snd_soc_dapm_dai_in) {
+			src = dai_w;
+			sink = w;
+		} else {
+			src = w;
+			sink = dai_w;
+		}
+		dev_dbg(dai->dev, "%s -> %s\n", src->name, sink->name);
+		/* Add the DAPM path and set widget's linked status
+		 * snd_soc_dapm_add_path(w->dapm, src, sink, NULL, NULL);
+		 * w->linked = 1;
+		 */
+	}
+}
+
+int gbaudio_dapm_link_component_dai_widgets(struct snd_soc_card *card,
+					    struct snd_soc_dapm_context *dapm)
+{
+	struct snd_soc_dapm_widget *dai_w;
+
+	/* For each DAI widget... */
+	list_for_each_entry(dai_w, &card->widgets, list) {
+		if (dai_w->dapm != dapm)
+			continue;
+		switch (dai_w->id) {
+		case snd_soc_dapm_dai_in:
+		case snd_soc_dapm_dai_out:
+			break;
+		default:
+			continue;
+		}
+		gbaudio_dapm_link_dai_widget(dai_w, card);
+	}
+
+	return 0;
+}
+
+static void gbaudio_dapm_free_path(struct snd_soc_dapm_path *path)
+{
+	list_del(&path->list_node[SND_SOC_DAPM_DIR_IN]);
+	list_del(&path->list_node[SND_SOC_DAPM_DIR_OUT]);
+	list_del(&path->list_kcontrol);
+	list_del(&path->list);
+	kfree(path);
+}
+
+static void gbaudio_dapm_free_widget(struct snd_soc_dapm_widget *w)
+{
+	struct snd_soc_dapm_path *p, *next_p;
+	enum snd_soc_dapm_direction dir;
+
+	list_del(&w->list);
+	/*
+	 * remove source and sink paths associated to this widget.
+	 * While removing the path, remove reference to it from both
+	 * source and sink widgets so that path is removed only once.
+	 */
+	gbaudio_dapm_for_each_direction(dir) {
+		snd_soc_dapm_widget_for_each_path_safe(w, dir, p, next_p)
+			gbaudio_dapm_free_path(p);
+	}
+
+	kfree(w->kcontrols);
+	kfree_const(w->name);
+	kfree_const(w->sname);
+	kfree(w);
+}
+
+int gbaudio_dapm_free_controls(struct snd_soc_dapm_context *dapm,
+			       const struct snd_soc_dapm_widget *widget,
+			       int num)
+{
+	int i;
+	struct snd_soc_dapm_widget *w, *next_w;
+#ifdef CONFIG_DEBUG_FS
+	struct dentry *parent = dapm->debugfs_dapm;
+	struct dentry *debugfs_w = NULL;
+#endif
+
+	mutex_lock(&dapm->card->dapm_mutex);
+	for (i = 0; i < num; i++) {
+		/* below logic can be optimized to identify widget pointer */
+		list_for_each_entry_safe(w, next_w, &dapm->card->widgets,
+					 list) {
+			if (w->dapm != dapm)
+				continue;
+			if (!strcmp(w->name, widget->name))
+				break;
+			w = NULL;
+		}
+		if (!w) {
+			dev_err(dapm->dev, "%s: widget not found\n",
+				widget->name);
+			return -EINVAL;
+		}
+		widget++;
+#ifdef CONFIG_DEBUG_FS
+		if (!parent)
+			debugfs_w = debugfs_lookup(w->name, parent);
+		debugfs_remove(debugfs_w);
+		debugfs_w = NULL;
+#endif
+		gbaudio_dapm_free_widget(w);
+	}
+	mutex_unlock(&dapm->card->dapm_mutex);
+	return 0;
+}
+
+static int gbaudio_remove_controls(struct snd_card *card, struct device *dev,
+				   const struct snd_kcontrol_new *controls,
+				   int num_controls, const char *prefix)
+{
+	int i, err;
+
+	for (i = 0; i < num_controls; i++) {
+		const struct snd_kcontrol_new *control = &controls[i];
+		struct snd_ctl_elem_id id;
+		struct snd_kcontrol *kctl;
+
+		if (prefix)
+			snprintf(id.name, sizeof(id.name), "%s %s", prefix,
+				 control->name);
+		else
+			strlcpy(id.name, control->name, sizeof(id.name));
+		id.numid = 0;
+		id.iface = control->iface;
+		id.device = control->device;
+		id.subdevice = control->subdevice;
+		id.index = control->index;
+		kctl = snd_ctl_find_id(card, &id);
+		if (!kctl) {
+			dev_err(dev, "%d: Failed to find %s\n", err,
+				control->name);
+			return -ENOENT;
+		}
+		err = snd_ctl_remove(card, kctl);
+		if (err < 0) {
+			dev_err(dev, "%d: Failed to remove %s\n", err,
+				control->name);
+			return err;
+		}
+	}
+	return 0;
+}
+
+int gbaudio_remove_component_controls(struct snd_soc_component *component,
+				      const struct snd_kcontrol_new *controls,
+				      unsigned int num_controls)
+{
+	struct snd_card *card = component->card->snd_card;
+
+	return gbaudio_remove_controls(card, component->dev, controls,
+				       num_controls, component->name_prefix);
+}
diff --git a/drivers/staging/greybus/audio_helper.h b/drivers/staging/greybus/audio_helper.h
new file mode 100644
index 000000000000..5cf1c6d7d3ea
--- /dev/null
+++ b/drivers/staging/greybus/audio_helper.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Greybus Audio Sound SoC helper APIs
+ */
+
+#ifndef __LINUX_GBAUDIO_HELPER_H
+#define __LINUX_GBAUDIO_HELPER_H
+
+int gbaudio_dapm_link_component_dai_widgets(struct snd_soc_card *card,
+					    struct snd_soc_dapm_context *dapm);
+int gbaudio_dapm_free_controls(struct snd_soc_dapm_context *dapm,
+			       const struct snd_soc_dapm_widget *widget,
+			       int num);
+int gbaudio_remove_component_controls(struct snd_soc_component *component,
+				      const struct snd_kcontrol_new *controls,
+				      unsigned int num_controls);
+#endif
-- 
2.26.2

Re: [RESEND PATCH v1 5/6] staging: greybus: audio: Add helper APIs for dynamic audio modules

[Dan Carpenter]

On Tue, Jun 02, 2020 at 10:51:14AM +0530, Vaibhav Agarwal wrote:
> +static int gbaudio_remove_controls(struct snd_card *card, struct device *dev,
> +				   const struct snd_kcontrol_new *controls,
> +				   int num_controls, const char *prefix)
> +{
> +	int i, err;
> +
> +	for (i = 0; i < num_controls; i++) {
> +		const struct snd_kcontrol_new *control = &controls[i];
> +		struct snd_ctl_elem_id id;
> +		struct snd_kcontrol *kctl;
> +
> +		if (prefix)
> +			snprintf(id.name, sizeof(id.name), "%s %s", prefix,
> +				 control->name);
> +		else
> +			strlcpy(id.name, control->name, sizeof(id.name));
> +		id.numid = 0;
> +		id.iface = control->iface;
> +		id.device = control->device;
> +		id.subdevice = control->subdevice;
> +		id.index = control->index;
> +		kctl = snd_ctl_find_id(card, &id);
> +		if (!kctl) {
> +			dev_err(dev, "%d: Failed to find %s\n", err,
> +				control->name);
> +			return -ENOENT;

I feel like this should be a continue instead of a return.

> +		}
> +		err = snd_ctl_remove(card, kctl);
> +		if (err < 0) {
> +			dev_err(dev, "%d: Failed to remove %s\n", err,
> +				control->name);
> +			return err;

Probably here as well.  The caller doesn't actually check for errors.

> +		}
> +	}
> +	return 0;
> +}

[RESEND PATCH v1 6/6] staging: greybus: audio: Enable GB codec, audio module compilation.

[Vaibhav Agarwal]

Currently, GB codec and audio module is conditionally compiled based on
GREYBUS_AUDIO_MSM8994. However, audio module is not dependent on MSM8994
platform and can be used generically with any platform that follows
GB Audio class specification.

Also, GB codec driver corresponds to dummy codec represented by I2S port
available on Toshiba AP Bridge. Added config option for the same in
kconfig file and accordingly updated Makefile.

Signed-off-by: Vaibhav Agarwal <vaibhav.sr@gmail.com>
---
 drivers/staging/greybus/Kconfig  | 14 +++++++++++++-
 drivers/staging/greybus/Makefile |  4 ++--
 2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/greybus/Kconfig b/drivers/staging/greybus/Kconfig
index d4777f5a8b90..cbcfcbba239b 100644
--- a/drivers/staging/greybus/Kconfig
+++ b/drivers/staging/greybus/Kconfig
@@ -3,7 +3,7 @@ if GREYBUS
 
 config GREYBUS_AUDIO
 	tristate "Greybus Audio Class driver"
-	depends on SOUND
+	depends on SOUND && SND_SOC
 	---help---
 	  Select this option if you have a device that follows the
 	  Greybus Audio Class specification.
@@ -11,6 +11,18 @@ config GREYBUS_AUDIO
 	  To compile this code as a module, chose M here: the module
 	  will be called gb-audio.ko
 
+config GREYBUS_AUDIO_APB_CODEC
+	tristate "Greybus APBridge Audio codec driver"
+	depends on SND_SOC && GREYBUS_AUDIO
+	help
+	  Select this option if you have a Toshiba APB device that has I2S
+          ports and acts as a Greybus "Dummy codec". This device is a
+          bridge from an APB-I2S port to a Unipro network.
+
+	  To compile this code as a module, chose M here: the module
+	  will be called gb-audio-codec.ko
+
+
 config GREYBUS_BOOTROM
 	tristate "Greybus Bootrom Class driver"
 	---help---
diff --git a/drivers/staging/greybus/Makefile b/drivers/staging/greybus/Makefile
index 3b4b6cabff19..7c5e89622334 100644
--- a/drivers/staging/greybus/Makefile
+++ b/drivers/staging/greybus/Makefile
@@ -40,8 +40,8 @@ gb-audio-manager-y	:= audio_manager.o audio_manager_module.o
 #ccflags-y += -DGB_AUDIO_MANAGER_SYSFS
 #endif
 
-obj-$(CONFIG_GREYBUS_AUDIO_MSM8994)	+= gb-audio-codec.o
-obj-$(CONFIG_GREYBUS_AUDIO_MSM8994)	+= gb-audio-module.o
+obj-$(CONFIG_GREYBUS_AUDIO_APB_CODEC)  	+= gb-audio-codec.o
+obj-$(CONFIG_GREYBUS_AUDIO_APB_CODEC)	+= gb-audio-module.o
 obj-$(CONFIG_GREYBUS_AUDIO)		+= gb-audio-gb.o
 obj-$(CONFIG_GREYBUS_AUDIO)		+= gb-audio-apbridgea.o
 obj-$(CONFIG_GREYBUS_AUDIO)		+= gb-audio-manager.o
-- 
2.26.2

Re: [RESEND PATCH v1 6/6] staging: greybus: audio: Enable GB codec, audio module compilation.

[Dan Carpenter]

On Tue, Jun 02, 2020 at 10:51:15AM +0530, Vaibhav Agarwal wrote:
> Currently, GB codec and audio module is conditionally compiled based on
> GREYBUS_AUDIO_MSM8994. However, audio module is not dependent on MSM8994
> platform and can be used generically with any platform that follows
> GB Audio class specification.
> 
> Also, GB codec driver corresponds to dummy codec represented by I2S port
> available on Toshiba AP Bridge. Added config option for the same in
> kconfig file and accordingly updated Makefile.
> 

This commit message was a bit confusing to me.  Just say:

"Currently you can't enable the Grey Bus Audio Codec because there is no
entry for it in the Kconfig file.  Originally the config name was going
to be AUDIO_MSM8994 but that's not correct because other types of
hardware are supported now.  I have chosen the name AUDIO_APB_CODEC
instead.  Also I had to update the dependencies for GREYBUS_AUDIO to
make the compile work."

Otherwise this looks fine.

regards,
dan carpenter

Re: [RESEND PATCH v1 6/6] staging: greybus: audio: Enable GB codec, audio module compilation.

[Vaibhav Agarwal]

On Tue, Jun 02, 2020 at 03:57:15PM +0300, Dan Carpenter wrote:
> On Tue, Jun 02, 2020 at 10:51:15AM +0530, Vaibhav Agarwal wrote:
> > Currently, GB codec and audio module is conditionally compiled based on
> > GREYBUS_AUDIO_MSM8994. However, audio module is not dependent on MSM8994
> > platform and can be used generically with any platform that follows
> > GB Audio class specification.
> > 
> > Also, GB codec driver corresponds to dummy codec represented by I2S port
> > available on Toshiba AP Bridge. Added config option for the same in
> > kconfig file and accordingly updated Makefile.
> > 
> 
> This commit message was a bit confusing to me.  Just say:
> 
> "Currently you can't enable the Grey Bus Audio Codec because there is no
> entry for it in the Kconfig file.  Originally the config name was going
> to be AUDIO_MSM8994 but that's not correct because other types of
> hardware are supported now.  I have chosen the name AUDIO_APB_CODEC
> instead.  Also I had to update the dependencies for GREYBUS_AUDIO to
> make the compile work."
> 
> Otherwise this looks fine.

Thanks Dan for sharing your valuable feedback. I'll make the suggested 
changes for the complete series in v2 patchset.

regards,
vaibhav

> 
> regards,
> dan carpenter
>