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Commit 07eafd99 authored by Mike Lockwood's avatar Mike Lockwood Committed by Ruchi Kandoi
Browse files

USB: gadget: f_audio_source: New gadget driver for audio output 



This driver presents a standard USB audio class interface to the host
and an ALSA PCM device to userspace

Change-Id: If16b14a5ff27045f9cb2daaf1ae9195c5eeab7d0
Signed-off-by: default avatarMike Lockwood <lockwood@google.com>
parent 41bda8a1

drivers/usb/gadget/android.c

+63 −0
Original line number Diff line number Diff line
@@ -43,6 +43,7 @@ 
#include "composite.c"



#include "f_fs.c"

#include "f_audio_source.c"

#include "f_mass_storage.c"

#include "u_serial.c"

#include "f_acm.c"
@@ -917,6 +918,67 @@ static struct android_usb_function accessory_function = { 
	.ctrlrequest	= accessory_function_ctrlrequest,

};



static int audio_source_function_init(struct android_usb_function *f,

			struct usb_composite_dev *cdev)

{

	struct audio_source_config *config;



	config = kzalloc(sizeof(struct audio_source_config), GFP_KERNEL);

	if (!config)

		return -ENOMEM;

	config->card = -1;

	config->device = -1;

	f->config = config;

	return 0;

}



static void audio_source_function_cleanup(struct android_usb_function *f)

{

	kfree(f->config);

}



static int audio_source_function_bind_config(struct android_usb_function *f,

						struct usb_configuration *c)

{

	struct audio_source_config *config = f->config;



	return audio_source_bind_config(c, config);

}



static void audio_source_function_unbind_config(struct android_usb_function *f,

						struct usb_configuration *c)

{

	struct audio_source_config *config = f->config;



	config->card = -1;

	config->device = -1;

}



static ssize_t audio_source_pcm_show(struct device *dev,

		struct device_attribute *attr, char *buf)

{

	struct android_usb_function *f = dev_get_drvdata(dev);

	struct audio_source_config *config = f->config;



	/* print PCM card and device numbers */

	return sprintf(buf, "%d %d\n", config->card, config->device);

}



static DEVICE_ATTR(pcm, S_IRUGO | S_IWUSR, audio_source_pcm_show, NULL);



static struct device_attribute *audio_source_function_attributes[] = {

	&dev_attr_pcm,

	NULL

};



static struct android_usb_function audio_source_function = {

	.name		= "audio_source",

	.init		= audio_source_function_init,

	.cleanup	= audio_source_function_cleanup,

	.bind_config	= audio_source_function_bind_config,

	.unbind_config	= audio_source_function_unbind_config,

	.attributes	= audio_source_function_attributes,

};



static struct android_usb_function *supported_functions[] = {

	&ffs_function,
@@ -927,6 +989,7 @@ static struct android_usb_function *supported_functions[] = { 
	&rndis_function,

	&mass_storage_function,

	&accessory_function,

	&audio_source_function,

	NULL

};

drivers/usb/gadget/f_audio_source.c

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+828 −0

File added.

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