mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/chenhuacai/linux-loongson
synced 2025-10-31 16:38:31 +00:00
f2ebf92c9e
This driver is glue between the USB gadget interface and the ALSA MIDI interface. It allows us to appear as a MIDI Streaming device to a host system on the other end of a USB cable. This includes linux/usb/audio.h and linux/usb/midi.h containing definitions from the relevant USB specifications for USB audio and USB MIDI devices. The following changes have been made since the first RFC posting: * Bug fixes to endpoint handling. * Workaround for USB_REQ_SET_CONFIGURATION handling, not understood yet. * Added SND and SND_RAWMIDI dependencies in Kconfig. * Moved usb_audio.h and usb_midi.h to usb/*.h * Added module parameters for ALSA card index and id. * Added module parameters for USB descriptor IDs and strings. * Removed some unneeded stuff inherited from zero.c, more to go. * Provide DECLARE_* macros for the variable-length structs. * Use kmalloc instead of usb_ep_alloc_buffer. * Limit source to 80 columns. * Return actual error code instead of -ENOMEM in a few places. Signed-off-by: Ben Williamson <ben.williamson@greyinnovation.com> Cc: David Brownell <david-b@pacbell.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
113 lines
3.2 KiB
C
113 lines
3.2 KiB
C
/*
|
|
* <linux/usb/midi.h> -- USB MIDI definitions.
|
|
*
|
|
* Copyright (C) 2006 Thumtronics Pty Ltd.
|
|
* Developed for Thumtronics by Grey Innovation
|
|
* Ben Williamson <ben.williamson@greyinnovation.com>
|
|
*
|
|
* This software is distributed under the terms of the GNU General Public
|
|
* License ("GPL") version 2, as published by the Free Software Foundation.
|
|
*
|
|
* This file holds USB constants and structures defined
|
|
* by the USB Device Class Definition for MIDI Devices.
|
|
* Comments below reference relevant sections of that document:
|
|
*
|
|
* http://www.usb.org/developers/devclass_docs/midi10.pdf
|
|
*/
|
|
|
|
#ifndef __LINUX_USB_MIDI_H
|
|
#define __LINUX_USB_MIDI_H
|
|
|
|
#include <linux/types.h>
|
|
|
|
/* A.1 MS Class-Specific Interface Descriptor Subtypes */
|
|
#define USB_MS_HEADER 0x01
|
|
#define USB_MS_MIDI_IN_JACK 0x02
|
|
#define USB_MS_MIDI_OUT_JACK 0x03
|
|
#define USB_MS_ELEMENT 0x04
|
|
|
|
/* A.2 MS Class-Specific Endpoint Descriptor Subtypes */
|
|
#define USB_MS_GENERAL 0x01
|
|
|
|
/* A.3 MS MIDI IN and OUT Jack Types */
|
|
#define USB_MS_EMBEDDED 0x01
|
|
#define USB_MS_EXTERNAL 0x02
|
|
|
|
/* 6.1.2.1 Class-Specific MS Interface Header Descriptor */
|
|
struct usb_ms_header_descriptor {
|
|
__u8 bLength;
|
|
__u8 bDescriptorType;
|
|
__u8 bDescriptorSubtype;
|
|
__le16 bcdMSC;
|
|
__le16 wTotalLength;
|
|
} __attribute__ ((packed));
|
|
|
|
#define USB_DT_MS_HEADER_SIZE 7
|
|
|
|
/* 6.1.2.2 MIDI IN Jack Descriptor */
|
|
struct usb_midi_in_jack_descriptor {
|
|
__u8 bLength;
|
|
__u8 bDescriptorType; // USB_DT_CS_INTERFACE
|
|
__u8 bDescriptorSubtype; // USB_MS_MIDI_IN_JACK
|
|
__u8 bJackType; // USB_MS_EMBEDDED/EXTERNAL
|
|
__u8 bJackID;
|
|
__u8 iJack;
|
|
} __attribute__ ((packed));
|
|
|
|
#define USB_DT_MIDI_IN_SIZE 6
|
|
|
|
struct usb_midi_source_pin {
|
|
__u8 baSourceID;
|
|
__u8 baSourcePin;
|
|
} __attribute__ ((packed));
|
|
|
|
/* 6.1.2.3 MIDI OUT Jack Descriptor */
|
|
struct usb_midi_out_jack_descriptor {
|
|
__u8 bLength;
|
|
__u8 bDescriptorType; // USB_DT_CS_INTERFACE
|
|
__u8 bDescriptorSubtype; // USB_MS_MIDI_OUT_JACK
|
|
__u8 bJackType; // USB_MS_EMBEDDED/EXTERNAL
|
|
__u8 bJackID;
|
|
__u8 bNrInputPins; // p
|
|
struct usb_midi_source_pin pins[]; // [p]
|
|
/*__u8 iJack; -- ommitted due to variable-sized pins[] */
|
|
} __attribute__ ((packed));
|
|
|
|
#define USB_DT_MIDI_OUT_SIZE(p) (7 + 2 * (p))
|
|
|
|
/* As above, but more useful for defining your own descriptors: */
|
|
#define DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(p) \
|
|
struct usb_midi_out_jack_descriptor_##p { \
|
|
__u8 bLength; \
|
|
__u8 bDescriptorType; \
|
|
__u8 bDescriptorSubtype; \
|
|
__u8 bJackType; \
|
|
__u8 bJackID; \
|
|
__u8 bNrInputPins; \
|
|
struct usb_midi_source_pin pins[p]; \
|
|
__u8 iJack; \
|
|
} __attribute__ ((packed))
|
|
|
|
/* 6.2.2 Class-Specific MS Bulk Data Endpoint Descriptor */
|
|
struct usb_ms_endpoint_descriptor {
|
|
__u8 bLength; // 4+n
|
|
__u8 bDescriptorType; // USB_DT_CS_ENDPOINT
|
|
__u8 bDescriptorSubtype; // USB_MS_GENERAL
|
|
__u8 bNumEmbMIDIJack; // n
|
|
__u8 baAssocJackID[]; // [n]
|
|
} __attribute__ ((packed));
|
|
|
|
#define USB_DT_MS_ENDPOINT_SIZE(n) (4 + (n))
|
|
|
|
/* As above, but more useful for defining your own descriptors: */
|
|
#define DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(n) \
|
|
struct usb_ms_endpoint_descriptor_##n { \
|
|
__u8 bLength; \
|
|
__u8 bDescriptorType; \
|
|
__u8 bDescriptorSubtype; \
|
|
__u8 bNumEmbMIDIJack; \
|
|
__u8 baAssocJackID[n]; \
|
|
} __attribute__ ((packed))
|
|
|
|
#endif
|