usb: gadget: f_uac1: Add support for UAC1 function

Add support for the UAC1 function with the configfs framework
along with following other changes:
 - Add dynamic updation of AudioStreaming interface numbers in
   the AudioControl interface descriptor.
 - Add superspeed support.
 - Stop playback on func disable so that pending request's
   completion is called before request has been freed in unbind.
 - Fix minor compilation issue.

Change-Id: Ib30fa735314c57b9543f89e18d1fb419ed5a2b9d
Signed-off-by: Ajay Agarwal <ajaya@codeaurora.org>

1 files changed, 63 insertions, 7 deletions

diff --git a/drivers/usb/gadget/function/f_uac1.c b/drivers/usb/gadget/function/f_uac1.c
index 29efbedc91f9..0445b2e1d8b5 100644
--- a/drivers/usb/gadget/function/f_uac1.c
+++ b/drivers/usb/gadget/function/f_uac1.c
@@ -79,11 +79,6 @@ static struct uac1_ac_header_descriptor_2 ac_header_desc = {
 	.bcdADC =		cpu_to_le16(0x0100),
 	.wTotalLength =		cpu_to_le16(UAC_DT_TOTAL_LENGTH),
 	.bInCollection =	F_AUDIO_NUM_INTERFACES,
-	.baInterfaceNr = {
-	/* Interface number of the AudioStream interfaces */
-		[0] =		1,
-		[1] =		2,
-	}
 };
 
 #define USB_OUT_IT_ID	1
@@ -209,6 +204,13 @@ static struct usb_endpoint_descriptor as_out_ep_desc  = {
 	.bInterval =		4,
 };
 
+static struct usb_ss_ep_comp_descriptor as_out_ep_comp_desc = {
+	.bLength =		sizeof(as_out_ep_comp_desc),
+	.bDescriptorType =	USB_DT_SS_ENDPOINT_COMP,
+
+	.wBytesPerInterval =	cpu_to_le16(1024),
+};
+
 /* Class-specific AS ISO OUT Endpoint Descriptor */
 static struct uac_iso_endpoint_descriptor as_iso_out_desc = {
 	.bLength =		UAC_ISO_ENDPOINT_DESC_SIZE,
@@ -240,6 +242,13 @@ static struct usb_endpoint_descriptor as_in_ep_desc  = {
 	.bInterval =		4,
 };
 
+static struct usb_ss_ep_comp_descriptor as_in_ep_comp_desc = {
+	.bLength =		sizeof(as_in_ep_comp_desc),
+	.bDescriptorType =	USB_DT_SS_ENDPOINT_COMP,
+
+	.wBytesPerInterval =	cpu_to_le16(1024),
+};
+
 /* Class-specific AS ISO OUT Endpoint Descriptor */
 static struct uac_iso_endpoint_descriptor as_iso_in_desc = {
 	.bLength =		UAC_ISO_ENDPOINT_DESC_SIZE,
@@ -279,6 +288,37 @@ static struct usb_descriptor_header *f_audio_desc[] = {
 	NULL,
 };
 
+static struct usb_descriptor_header *f_audio_ss_desc[] = {
+	(struct usb_descriptor_header *)&ac_interface_desc,
+	(struct usb_descriptor_header *)&ac_header_desc,
+
+	(struct usb_descriptor_header *)&usb_out_it_desc,
+	(struct usb_descriptor_header *)&io_out_ot_desc,
+	(struct usb_descriptor_header *)&io_in_it_desc,
+	(struct usb_descriptor_header *)&usb_in_ot_desc,
+
+	(struct usb_descriptor_header *)&as_out_interface_alt_0_desc,
+	(struct usb_descriptor_header *)&as_out_interface_alt_1_desc,
+	(struct usb_descriptor_header *)&as_out_header_desc,
+
+	(struct usb_descriptor_header *)&as_out_type_i_desc,
+
+	(struct usb_descriptor_header *)&as_out_ep_desc,
+	(struct usb_descriptor_header *)&as_out_ep_comp_desc,
+	(struct usb_descriptor_header *)&as_iso_out_desc,
+
+	(struct usb_descriptor_header *)&as_in_interface_alt_0_desc,
+	(struct usb_descriptor_header *)&as_in_interface_alt_1_desc,
+	(struct usb_descriptor_header *)&as_in_header_desc,
+
+	(struct usb_descriptor_header *)&as_in_type_i_desc,
+
+	(struct usb_descriptor_header *)&as_in_ep_desc,
+	(struct usb_descriptor_header *)&as_in_ep_comp_desc,
+	(struct usb_descriptor_header *)&as_iso_in_desc,
+	NULL,
+};
+
 enum {
 	STR_AC_IF,
 	STR_USB_OUT_IT,
@@ -504,6 +544,7 @@ static void f_audio_disable(struct usb_function *f)
 	uac1->as_in_alt = 0;
 
 	u_audio_stop_capture(&uac1->g_audio);
+	u_audio_stop_playback(&uac1->g_audio);
 }
 
 /*-------------------------------------------------------------------------*/
@@ -570,6 +611,7 @@ static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
 	status = usb_interface_id(c, f);
 	if (status < 0)
 		goto fail;
+	ac_header_desc.baInterfaceNr[0] = status;
 	as_out_interface_alt_0_desc.bInterfaceNumber = status;
 	as_out_interface_alt_1_desc.bInterfaceNumber = status;
 	uac1->as_out_intf = status;
@@ -578,6 +620,7 @@ static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
 	status = usb_interface_id(c, f);
 	if (status < 0)
 		goto fail;
+	ac_header_desc.baInterfaceNr[1] = status;
 	as_in_interface_alt_0_desc.bInterfaceNumber = status;
 	as_in_interface_alt_1_desc.bInterfaceNumber = status;
 	uac1->as_in_intf = status;
@@ -601,8 +644,8 @@ static int f_audio_bind(struct usb_configuration *c, struct usb_function *f)
 	audio->in_ep->desc = &as_in_ep_desc;
 
 	/* copy descriptors, and track endpoint copies */
-	status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc, NULL,
-					NULL);
+	status = usb_assign_descriptors(f, f_audio_desc, f_audio_desc,
+							f_audio_ss_desc);
 	if (status)
 		goto fail;
 
@@ -798,5 +841,18 @@ static struct usb_function *f_audio_alloc(struct usb_function_instance *fi)
 }
 
 DECLARE_USB_FUNCTION_INIT(uac1, f_audio_alloc_inst, f_audio_alloc);
+
+static int __init afunc_init(void)
+{
+	return usb_function_register(&uac1usb_func);
+}
+
+static void __exit afunc_exit(void)
+{
+	usb_function_unregister(&uac1usb_func);
+}
+
+module_init(afunc_init);
+module_exit(afunc_exit);
 MODULE_LICENSE("GPL");
 MODULE_AUTHOR("Ruslan Bilovol");