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From:   Wesley Cheng <quic_wcheng@quicinc.com>
To:     <agross@kernel.org>, <andersson@kernel.org>, <robh+dt@kernel.org>,
        <krzysztof.kozlowski+dt@linaro.org>, <conor+dt@kernel.org>,
        <catalin.marinas@arm.com>, <will@kernel.org>,
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        <tiwai@suse.com>, <srinivas.kandagatla@linaro.org>,
        <bgoswami@quicinc.com>, <Thinh.Nguyen@synopsys.com>
CC:     <linux-arm-msm@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>,
        <linux-arm-kernel@lists.infradead.org>,
        <linux-usb@vger.kernel.org>, <alsa-devel@alsa-project.org>,
        <quic_jackp@quicinc.com>, <pierre-louis.bossart@linux.intel.com>,
        <oneukum@suse.com>, <albertccwang@google.com>,
        <o-takashi@sakamocchi.jp>, Wesley Cheng <quic_wcheng@quicinc.com>
Subject: [PATCH v4 12/32] sound: usb: Export USB SND APIs for modules
Date:   Mon, 24 Jul 2023 19:33:56 -0700
Message-ID: <20230725023416.11205-13-quic_wcheng@quicinc.com>
In-Reply-To: <20230725023416.11205-1-quic_wcheng@quicinc.com>
References: <20230725023416.11205-1-quic_wcheng@quicinc.com>
MIME-Version: 1.0
Content-Type: text/plain
Precedence: bulk

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

Signed-off-by: Wesley Cheng <quic_wcheng@quicinc.com>
---
 sound/core/oss/pcm_oss.c |  4 ++--
 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 ++++++++++++
 6 files changed, 25 insertions(+), 5 deletions(-)

diff --git a/sound/core/oss/pcm_oss.c b/sound/core/oss/pcm_oss.c
index 728c211142d1..7773b5362e1a 100644
--- a/sound/core/oss/pcm_oss.c
+++ b/sound/core/oss/pcm_oss.c
@@ -444,8 +444,8 @@ static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm,
 }
 
 static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params,
-				 snd_pcm_hw_param_t var, unsigned int val,
-				 int dir)
+				snd_pcm_hw_param_t var, unsigned int val,
+				int dir)
 {
 	int changed;
 	if (hw_is_mask(var)) {
diff --git a/sound/usb/card.c b/sound/usb/card.c
index 9365d1e17836..a3fad66a3337 100644
--- a/sound/usb/card.c
+++ b/sound/usb/card.c
@@ -1076,6 +1076,7 @@ int snd_usb_autoresume(struct snd_usb_audio *chip)
 	}
 	return 0;
 }
+EXPORT_SYMBOL_GPL(snd_usb_autoresume);
 
 void snd_usb_autosuspend(struct snd_usb_audio *chip)
 {
@@ -1089,6 +1090,7 @@ 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_GPL(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 a385e85c4650..0757499599c8 100644
--- a/sound/usb/endpoint.c
+++ b/sound/usb/endpoint.c
@@ -866,6 +866,7 @@ 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
@@ -1503,6 +1504,7 @@ int snd_usb_endpoint_prepare(struct snd_usb_audio *chip,
 	mutex_unlock(&chip->mutex);
 	return err;
 }
+EXPORT_SYMBOL_GPL(snd_usb_endpoint_prepare);
 
 /* get the current rate set to the given clock by any endpoint */
 int snd_usb_endpoint_get_clock_rate(struct snd_usb_audio *chip, int clock)
diff --git a/sound/usb/helper.c b/sound/usb/helper.c
index bf80e55d013a..4322ae3738e6 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 eec5232f9fb2..b6fb6d84d9eb 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_GPL(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_GPL(find_substream_format);
 
 bool snd_usb_pcm_has_fixed_rate(struct snd_usb_substream *subs)
 {
@@ -446,7 +448,7 @@ 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) {
@@ -460,6 +462,7 @@ 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 388fe2ba346d..b5216cb19e75 100644
--- a/sound/usb/pcm.h
+++ b/sound/usb/pcm.h
@@ -15,4 +15,16 @@ 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 */