libfx2-migration: audio example

[jedrzejboczar]

This is a part of splitting #47 into smaller PRs.

This is an example of USB audio device implementation. It includes descriptors configuration for proper enumeration, and handles set/get interface commands.

The relevant code is located in examples/audio/ and in common/.

[todo]

{ .generic = (struct usb_desc_generic *) &usb_uac_if_assoc },

HDMI2USB-fx2-firmware/common/uac.h

Lines 22 to 27 in 0a46528

	// TODO: { .generic = (struct usb_desc_generic *) &usb_uac_if_assoc },
	// Marco for adding descriptors to usb_configuration_c
	#define UAC_DESCRIPTORS_LIST \
	{ .interface = &usb_uac_std_ac_interface }, \
	{ .generic = (struct usb_desc_generic *) &usb_uac_ac_header }, \
	{ .generic = (struct usb_desc_generic *) &usb_uac_input_terminal }, \

---

This comment was generated by todo based on a TODO comment in 0a46528 in #51. cc @antmicro.

[todo]

this has been extracted from linux headers, but should be organised better,

HDMI2USB-fx2-firmware/common/uac_defs.h

Lines 8 to 13 in 0a46528

	// TODO: this has been extracted from linux headers, but should be organised better,
	// we also need one naming convention corresponding to that in libfx2
	enum {
	/* bInterfaceProtocol values to denote the version of the standard used */
	UAC_VERSION_1 = 0x00,
	UAC_VERSION_2 = 0x20,

---

This comment was generated by todo based on a TODO comment in 0a46528 in #51. cc @antmicro.

[todo]

{ .generic = (struct usb_desc_generic *) &usb_uac_if_assoc },

HDMI2USB-fx2-firmware/common/uac.h

Lines 22 to 27 in 4e54a46

	// TODO: { .generic = (struct usb_desc_generic *) &usb_uac_if_assoc },
	// Marco for adding descriptors to usb_configuration_c
	#define UAC_DESCRIPTORS_LIST \
	{ .interface = &usb_uac_std_ac_interface }, \
	{ .generic = (struct usb_desc_generic *) &usb_uac_ac_header }, \
	{ .generic = (struct usb_desc_generic *) &usb_uac_input_terminal }, \

---

This comment was generated by todo based on a TODO comment in 4e54a46 in #51. cc @antmicro.

[todo]

{ .generic = (struct usb_desc_generic *) &usb_uac_if_assoc },

HDMI2USB-fx2-firmware/common/uac.h

Lines 22 to 27 in 35d56d8

	// TODO: { .generic = (struct usb_desc_generic *) &usb_uac_if_assoc },
	// Marco for adding descriptors to usb_configuration_c
	#define UAC_DESCRIPTORS_LIST \
	{ .interface = &usb_uac_std_ac_interface }, \
	{ .generic = (struct usb_desc_generic *) &usb_uac_ac_header }, \
	{ .generic = (struct usb_desc_generic *) &usb_uac_input_terminal }, \

---

This comment was generated by todo based on a TODO comment in 35d56d8 in #51. cc @antmicro.