1 /* 2 * <linux/usb/midi.h> -- USB MIDI definitions. 3 * 4 * Copyright (C) 2006 Thumtronics Pty Ltd. 5 * Developed for Thumtronics by Grey Innovation 6 * Ben Williamson <ben.williamson (at) greyinnovation.com> 7 * 8 * This software is distributed under the terms of the GNU General Public 9 * License ("GPL") version 2, as published by the Free Software Foundation. 10 * 11 * This file holds USB constants and structures defined 12 * by the USB Device Class Definition for MIDI Devices. 13 * Comments below reference relevant sections of that document: 14 * 15 * http://www.usb.org/developers/devclass_docs/midi10.pdf 16 */ 17 18 #ifndef __LINUX_USB_MIDI_H 19 #define __LINUX_USB_MIDI_H 20 21 #include <linux/types.h> 22 23 /* A.1 MS Class-Specific Interface Descriptor Subtypes */ 24 #define USB_MS_HEADER 0x01 25 #define USB_MS_MIDI_IN_JACK 0x02 26 #define USB_MS_MIDI_OUT_JACK 0x03 27 #define USB_MS_ELEMENT 0x04 28 29 /* A.2 MS Class-Specific Endpoint Descriptor Subtypes */ 30 #define USB_MS_GENERAL 0x01 31 32 /* A.3 MS MIDI IN and OUT Jack Types */ 33 #define USB_MS_EMBEDDED 0x01 34 #define USB_MS_EXTERNAL 0x02 35 36 /* 6.1.2.1 Class-Specific MS Interface Header Descriptor */ 37 struct usb_ms_header_descriptor { 38 __u8 bLength; 39 __u8 bDescriptorType; 40 __u8 bDescriptorSubtype; 41 __le16 bcdMSC; 42 __le16 wTotalLength; 43 } __attribute__ ((packed)); 44 45 #define USB_DT_MS_HEADER_SIZE 7 46 47 /* 6.1.2.2 MIDI IN Jack Descriptor */ 48 struct usb_midi_in_jack_descriptor { 49 __u8 bLength; 50 __u8 bDescriptorType; // USB_DT_CS_INTERFACE 51 __u8 bDescriptorSubtype; // USB_MS_MIDI_IN_JACK 52 __u8 bJackType; // USB_MS_EMBEDDED/EXTERNAL 53 __u8 bJackID; 54 __u8 iJack; 55 } __attribute__ ((packed)); 56 57 #define USB_DT_MIDI_IN_SIZE 6 58 59 struct usb_midi_source_pin { 60 __u8 baSourceID; 61 __u8 baSourcePin; 62 } __attribute__ ((packed)); 63 64 /* 6.1.2.3 MIDI OUT Jack Descriptor */ 65 struct usb_midi_out_jack_descriptor { 66 __u8 bLength; 67 __u8 bDescriptorType; // USB_DT_CS_INTERFACE 68 __u8 bDescriptorSubtype; // USB_MS_MIDI_OUT_JACK 69 __u8 bJackType; // USB_MS_EMBEDDED/EXTERNAL 70 __u8 bJackID; 71 __u8 bNrInputPins; // p 72 struct usb_midi_source_pin pins[]; // [p] 73 /*__u8 iJack; -- ommitted due to variable-sized pins[] */ 74 } __attribute__ ((packed)); 75 76 #define USB_DT_MIDI_OUT_SIZE(p) (7 + 2 * (p)) 77 78 /* As above, but more useful for defining your own descriptors: */ 79 #define DECLARE_USB_MIDI_OUT_JACK_DESCRIPTOR(p) \ 80 struct usb_midi_out_jack_descriptor_##p { \ 81 __u8 bLength; \ 82 __u8 bDescriptorType; \ 83 __u8 bDescriptorSubtype; \ 84 __u8 bJackType; \ 85 __u8 bJackID; \ 86 __u8 bNrInputPins; \ 87 struct usb_midi_source_pin pins[p]; \ 88 __u8 iJack; \ 89 } __attribute__ ((packed)) 90 91 /* 6.2.2 Class-Specific MS Bulk Data Endpoint Descriptor */ 92 struct usb_ms_endpoint_descriptor { 93 __u8 bLength; // 4+n 94 __u8 bDescriptorType; // USB_DT_CS_ENDPOINT 95 __u8 bDescriptorSubtype; // USB_MS_GENERAL 96 __u8 bNumEmbMIDIJack; // n 97 __u8 baAssocJackID[]; // [n] 98 } __attribute__ ((packed)); 99 100 #define USB_DT_MS_ENDPOINT_SIZE(n) (4 + (n)) 101 102 /* As above, but more useful for defining your own descriptors: */ 103 #define DECLARE_USB_MS_ENDPOINT_DESCRIPTOR(n) \ 104 struct usb_ms_endpoint_descriptor_##n { \ 105 __u8 bLength; \ 106 __u8 bDescriptorType; \ 107 __u8 bDescriptorSubtype; \ 108 __u8 bNumEmbMIDIJack; \ 109 __u8 baAssocJackID[n]; \ 110 } __attribute__ ((packed)) 111 112 #endif 113
