USB: gmidi: New USB MIDI Gadget class driver.
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>
diff --git a/include/linux/usb/audio.h b/include/linux/usb/audio.h
new file mode 100644
index 0000000..6bd2359
--- /dev/null
+++ b/include/linux/usb/audio.h
@@ -0,0 +1,53 @@
+/*
+ * <linux/usb/audio.h> -- USB Audio 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 Audio Devices.
+ * Comments below reference relevant sections of that document:
+ *
+ * http://www.usb.org/developers/devclass_docs/audio10.pdf
+ */
+
+#ifndef __LINUX_USB_AUDIO_H
+#define __LINUX_USB_AUDIO_H
+
+#include <linux/types.h>
+
+/* A.2 Audio Interface Subclass Codes */
+#define USB_SUBCLASS_AUDIOCONTROL 0x01
+#define USB_SUBCLASS_AUDIOSTREAMING 0x02
+#define USB_SUBCLASS_MIDISTREAMING 0x03
+
+/* 4.3.2 Class-Specific AC Interface Descriptor */
+struct usb_ac_header_descriptor {
+ __u8 bLength; // 8+n
+ __u8 bDescriptorType; // USB_DT_CS_INTERFACE
+ __u8 bDescriptorSubtype; // USB_MS_HEADER
+ __le16 bcdADC; // 0x0100
+ __le16 wTotalLength; // includes Unit and Terminal desc.
+ __u8 bInCollection; // n
+ __u8 baInterfaceNr[]; // [n]
+} __attribute__ ((packed));
+
+#define USB_DT_AC_HEADER_SIZE(n) (8+(n))
+
+/* As above, but more useful for defining your own descriptors: */
+#define DECLARE_USB_AC_HEADER_DESCRIPTOR(n) \
+struct usb_ac_header_descriptor_##n { \
+ __u8 bLength; \
+ __u8 bDescriptorType; \
+ __u8 bDescriptorSubtype; \
+ __le16 bcdADC; \
+ __le16 wTotalLength; \
+ __u8 bInCollection; \
+ __u8 baInterfaceNr[n]; \
+} __attribute__ ((packed))
+
+#endif
diff --git a/include/linux/usb/midi.h b/include/linux/usb/midi.h
new file mode 100644
index 0000000..11a97d5
--- /dev/null
+++ b/include/linux/usb/midi.h
@@ -0,0 +1,112 @@
+/*
+ * <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