linux-kernel - [RFC PATCH 05/14] sound: usb: Export USB SND APIs for modules

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Date:   Fri, 23 Dec 2022 15:31:51 -0800
From:   Wesley Cheng <quic_wcheng@...cinc.com>
To:     <srinivas.kandagatla@...aro.org>, <mathias.nyman@...el.com>,
        <perex@...ex.cz>, <broonie@...nel.org>, <lgirdwood@...il.com>,
        <andersson@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
        <gregkh@...uxfoundation.org>, <Thinh.Nguyen@...opsys.com>,
        <bgoswami@...cinc.com>, <tiwai@...e.com>, <robh+dt@...nel.org>,
        <agross@...nel.org>
CC:     <linux-kernel@...r.kernel.org>, <linux-arm-msm@...r.kernel.org>,
        <alsa-devel@...a-project.org>, <devicetree@...r.kernel.org>,
        <linux-usb@...r.kernel.org>, <quic_jackp@...cinc.com>,
        <quic_plai@...cinc.com>, Wesley Cheng <quic_wcheng@...cinc.com>
Subject: [RFC PATCH 05/14] sound: usb: Export USB SND APIs for modules

Some vendor modules will utilize useful parsing and endpoint management
APIs to start audio playback/capture.

Signed-off-by: Wesley Cheng <quic_wcheng@...cinc.com>
---
 sound/usb/card.c     |  2 ++
 sound/usb/endpoint.c |  2 ++
 sound/usb/helper.c   |  1 +
 sound/usb/pcm.c      |  9 ++++++---
 sound/usb/pcm.h      | 12 ++++++++++++
 5 files changed, 23 insertions(+), 3 deletions(-)

diff --git a/sound/usb/card.c b/sound/usb/card.c
index 212f55a7683c..396e5a34e23b 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -1068,6 +1068,7 @@ int snd_usb_autoresume(struct snd_usb_audio *chip)
 	}
 	return 0;
 }
+EXPORT_SYMBOL(snd_usb_autoresume);
 
 void snd_usb_autosuspend(struct snd_usb_audio *chip)
 {
@@ -1081,6 +1082,7 @@ void snd_usb_autosuspend(struct snd_usb_audio *chip)
 	for (i = 0; i < chip->num_interfaces; i++)
 		usb_autopm_put_interface(chip->intf[i]);
 }
+EXPORT_SYMBOL(snd_usb_autosuspend);
 
 static int usb_audio_suspend(struct usb_interface *intf, pm_message_t message)
 {
diff --git a/sound/usb/endpoint.c b/sound/usb/endpoint.c
index 310cd6fb0038..1663f9e9cb4b 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -858,6 +858,7 @@ snd_usb_endpoint_open(struct snd_usb_audio *chip,
 	mutex_unlock(&chip->mutex);
 	return ep;
 }
+EXPORT_SYMBOL_GPL(snd_usb_endpoint_open);
 
 /*
  * snd_usb_endpoint_set_sync: Link data and sync endpoints
@@ -1525,6 +1526,7 @@ int snd_usb_endpoint_get_clock_rate(struct snd_usb_audio *chip, int clock)
 	mutex_unlock(&chip->mutex);
 	return rate;
 }
+EXPORT_SYMBOL(snd_usb_endpoint_prepare);
 
 /**
  * snd_usb_endpoint_start: start an snd_usb_endpoint
diff --git a/sound/usb/helper.c b/sound/usb/helper.c
index a4410267bf70..b4ed9ef3eeb3 100644
--- a/sound/usb/helper.c
+++ b/sound/usb/helper.c
@@ -62,6 +62,7 @@ void *snd_usb_find_csint_desc(void *buffer, int buflen, void *after, u8 dsubtype
 	}
 	return NULL;
 }
+EXPORT_SYMBOL_GPL(snd_usb_find_csint_desc);
 
 /*
  * Wrapper for usb_control_msg().
diff --git a/sound/usb/pcm.c b/sound/usb/pcm.c
index 8ed165f036a0..624f555c6657 100644
--- a/sound/usb/pcm.c
+++ b/sound/usb/pcm.c
@@ -87,7 +87,7 @@ static snd_pcm_uframes_t snd_usb_pcm_pointer(struct snd_pcm_substream *substream
 /*
  * find a matching audio format
  */
-static const struct audioformat *
+const struct audioformat *
 find_format(struct list_head *fmt_list_head, snd_pcm_format_t format,
 	    unsigned int rate, unsigned int channels, bool strict_match,
 	    struct snd_usb_substream *subs)
@@ -147,8 +147,9 @@ find_format(struct list_head *fmt_list_head, snd_pcm_format_t format,
 	}
 	return found;
 }
+EXPORT_SYMBOL(find_format);
 
-static const struct audioformat *
+const struct audioformat *
 find_substream_format(struct snd_usb_substream *subs,
 		      const struct snd_pcm_hw_params *params)
 {
@@ -156,6 +157,7 @@ find_substream_format(struct snd_usb_substream *subs,
 			   params_rate(params), params_channels(params),
 			   true, subs);
 }
+EXPORT_SYMBOL(find_substream_format);
 
 static int init_pitch_v1(struct snd_usb_audio *chip, int ep)
 {
@@ -418,7 +420,7 @@ int snd_usb_pcm_resume(struct snd_usb_stream *as)
 	return 0;
 }
 
-static void close_endpoints(struct snd_usb_audio *chip,
+void close_endpoints(struct snd_usb_audio *chip,
 			    struct snd_usb_substream *subs)
 {
 	if (subs->data_endpoint) {
@@ -432,6 +434,7 @@ static void close_endpoints(struct snd_usb_audio *chip,
 		subs->sync_endpoint = NULL;
 	}
 }
+EXPORT_SYMBOL(close_endpoints);
 
 /*
  * hw_params callback
diff --git a/sound/usb/pcm.h b/sound/usb/pcm.h
index 493a4e34d78d..43a4a03dfce7 100644
--- a/sound/usb/pcm.h
+++ b/sound/usb/pcm.h
@@ -13,4 +13,16 @@ void snd_usb_preallocate_buffer(struct snd_usb_substream *subs);
 int snd_usb_audioformat_set_sync_ep(struct snd_usb_audio *chip,
 				    struct audioformat *fmt);
 
+void close_endpoints(struct snd_usb_audio *chip,
+			    struct snd_usb_substream *subs);
+int configure_endpoints(struct snd_usb_audio *chip,
+			       struct snd_usb_substream *subs);
+
+const struct audioformat *
+find_format(struct list_head *fmt_list_head, snd_pcm_format_t format,
+	    unsigned int rate, unsigned int channels, bool strict_match,
+	    struct snd_usb_substream *subs);
+const struct audioformat *
+find_substream_format(struct snd_usb_substream *subs,
+		      const struct snd_pcm_hw_params *params);
 #endif /* __USBAUDIO_PCM_H */