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ALSA: usb-audio: Define USB MIDI 2.0 specs
Define new structs and constants from USB MIDI 2.0 specification, to be used in the upcoming MIDI 2.0 support in USB-audio driver. A new class-specific endpoint descriptor and group terminal block descriptors are defined. Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Acked-by: Jaroslav Kysela <perex@perex.cz> Link: https://lore.kernel.org/r/20230523075358.9672-9-tiwai@suse.de Signed-off-by: Takashi Iwai <tiwai@suse.de>
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Takashi Iwai
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May 23, 2023
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| /* SPDX-License-Identifier: GPL-2.0 */ | ||
| /* | ||
| * <linux/usb/midi-v2.h> -- USB MIDI 2.0 definitions. | ||
| */ | ||
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| #ifndef __LINUX_USB_MIDI_V2_H | ||
| #define __LINUX_USB_MIDI_V2_H | ||
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| #include <linux/types.h> | ||
| #include <linux/usb/midi.h> | ||
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| /* A.1 MS Class-Specific Interface Descriptor Types */ | ||
| #define USB_DT_CS_GR_TRM_BLOCK 0x26 | ||
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| /* A.1 MS Class-Specific Interface Descriptor Subtypes */ | ||
| /* same as MIDI 1.0 */ | ||
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| /* A.2 MS Class-Specific Endpoint Descriptor Subtypes */ | ||
| #define USB_MS_GENERAL_2_0 0x02 | ||
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| /* A.3 MS Class-Specific Group Terminal Block Descriptor Subtypes */ | ||
| #define USB_MS_GR_TRM_BLOCK_UNDEFINED 0x00 | ||
| #define USB_MS_GR_TRM_BLOCK_HEADER 0x01 | ||
| #define USB_MS_GR_TRM_BLOCK 0x02 | ||
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| /* A.4 MS Interface Header MIDIStreaming Class Revision */ | ||
| #define USB_MS_REV_MIDI_1_0 0x0100 | ||
| #define USB_MS_REV_MIDI_2_0 0x0200 | ||
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| /* A.5 MS MIDI IN and OUT Jack Types */ | ||
| /* same as MIDI 1.0 */ | ||
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| /* A.6 Group Terminal Block Types */ | ||
| #define USB_MS_GR_TRM_BLOCK_TYPE_BIDIRECTIONAL 0x00 | ||
| #define USB_MS_GR_TRM_BLOCK_TYPE_INPUT_ONLY 0x01 | ||
| #define USB_MS_GR_TRM_BLOCK_TYPE_OUTPUT_ONLY 0x02 | ||
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| /* A.7 Group Terminal Default MIDI Protocol */ | ||
| #define USB_MS_MIDI_PROTO_UNKNOWN 0x00 /* Unknown (Use MIDI-CI) */ | ||
| #define USB_MS_MIDI_PROTO_1_0_64 0x01 /* MIDI 1.0, UMP up to 64bits */ | ||
| #define USB_MS_MIDI_PROTO_1_0_64_JRTS 0x02 /* MIDI 1.0, UMP up to 64bits, Jitter Reduction Timestamps */ | ||
| #define USB_MS_MIDI_PROTO_1_0_128 0x03 /* MIDI 1.0, UMP up to 128bits */ | ||
| #define USB_MS_MIDI_PROTO_1_0_128_JRTS 0x04 /* MIDI 1.0, UMP up to 128bits, Jitter Reduction Timestamps */ | ||
| #define USB_MS_MIDI_PROTO_2_0 0x11 /* MIDI 2.0 */ | ||
| #define USB_MS_MIDI_PROTO_2_0_JRTS 0x12 /* MIDI 2.0, Jitter Reduction Timestamps */ | ||
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| /* 5.2.2.1 Class-Specific MS Interface Header Descriptor */ | ||
| /* Same as MIDI 1.0, use struct usb_ms_header_descriptor */ | ||
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| /* 5.3.2 Class-Specific MIDI Streaming Data Endpoint Descriptor */ | ||
| struct usb_ms20_endpoint_descriptor { | ||
| __u8 bLength; /* 4+n */ | ||
| __u8 bDescriptorType; /* USB_DT_CS_ENDPOINT */ | ||
| __u8 bDescriptorSubtype; /* USB_MS_GENERAL_2_0 */ | ||
| __u8 bNumGrpTrmBlock; /* Number of Group Terminal Blocks: n */ | ||
| __u8 baAssoGrpTrmBlkID[]; /* ID of the Group Terminal Blocks [n] */ | ||
| } __packed; | ||
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| #define USB_DT_MS20_ENDPOINT_SIZE(n) (4 + (n)) | ||
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| /* As above, but more useful for defining your own descriptors: */ | ||
| #define DECLARE_USB_MS20_ENDPOINT_DESCRIPTOR(n) \ | ||
| struct usb_ms20_endpoint_descriptor_##n { \ | ||
| __u8 bLength; \ | ||
| __u8 bDescriptorType; \ | ||
| __u8 bDescriptorSubtype; \ | ||
| __u8 bNumGrpTrmBlock; \ | ||
| __u8 baAssoGrpTrmBlkID[n]; \ | ||
| } __packed | ||
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| /* 5.4.1 Class-Specific Group Terminal Block Header Descriptor */ | ||
| struct usb_ms20_gr_trm_block_header_descriptor { | ||
| __u8 bLength; /* 5 */ | ||
| __u8 bDescriptorType; /* USB_DT_CS_GR_TRM_BLOCK */ | ||
| __u8 bDescriptorSubtype; /* USB_MS_GR_TRM_BLOCK_HEADER */ | ||
| __u16 wTotalLength; /* Total number of bytes */ | ||
| } __packed; | ||
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| /* 5.4.2.1 Group Terminal Block Descriptor */ | ||
| struct usb_ms20_gr_trm_block_descriptor { | ||
| __u8 bLength; /* 13 */ | ||
| __u8 bDescriptorType; /* USB_DT_CS_GR_TRM_BLOCK */ | ||
| __u8 bDescriptorSubtype; /* USB_MS_GR_TRM_BLOCK */ | ||
| __u8 bGrpTrmBlkID; /* ID of this Group Terminal Block */ | ||
| __u8 bGrpTrmBlkType; /* Group Terminal Block Type */ | ||
| __u8 nGroupTrm; /* The first member Group Terminal in this block */ | ||
| __u8 nNumGroupTrm; /* Number of member Group Terminals spanned */ | ||
| __u8 iBlockItem; /* String ID of Block item */ | ||
| __u8 bMIDIProtocol; /* Default MIDI protocol */ | ||
| __u16 wMaxInputBandwidth; /* Max input bandwidth capability in 4kB/s */ | ||
| __u16 wMaxOutputBandwidth; /* Max output bandwidth capability in 4kB/s */ | ||
| } __packed; | ||
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| #endif /* __LINUX_USB_MIDI_V2_H */ |