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Commit 8fee4aff authored by Daniel Mack's avatar Daniel Mack Committed by Takashi Iwai
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ALSA: usbaudio: introduce new types for audio class v2 



This patch adds some definitions for audio class v2.

Unfortunately, the UNIT types PROCESSING_UNIT and EXTENSION_UNIT have
different numerical representations in both standards, so there is need
for a _V1 add-on now. usbmixer.c is changed accordingly.

Signed-off-by: default avatarDaniel Mack <daniel@caiaq.de>
Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
parent 28e1b773

include/linux/usb/audio.h

+57 −0
Original line number Diff line number Diff line
@@ -25,6 +25,9 @@ 
#define USB_SUBCLASS_AUDIOSTREAMING	0x02

#define USB_SUBCLASS_MIDISTREAMING	0x03



#define UAC_VERSION_1			0x00

#define UAC_VERSION_2			0x20



/* A.5 Audio Class-Specific AC Interface Descriptor Subtypes */

#define UAC_HEADER			0x01

#define UAC_INPUT_TERMINAL		0x02
@@ -180,6 +183,19 @@ struct uac_as_header_descriptor_v1 { 
	__le16 wFormatTag;		/* The Audio Data Format */

} __attribute__ ((packed));



struct uac_as_header_descriptor_v2 {

	__u8 bLength;

	__u8 bDescriptorType;

	__u8 bDescriptorSubtype;

	__u8 bTerminalLink;

	__u8 bmControls;

	__u8 bFormatType;

	__u32 bmFormats;

	__u8 bNrChannels;

	__u32 bmChannelConfig;

	__u8 iChannelNames;

} __attribute__((packed));



#define UAC_DT_AS_HEADER_SIZE		7



/* Formats - A.1.1 Audio Data Format Type I Codes */
@@ -232,6 +248,19 @@ struct uac_format_type_i_discrete_descriptor_##n { \ 


#define UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(n)	(8 + (n * 3))



struct uac_format_type_i_ext_descriptor {

	__u8 bLength;

	__u8 bDescriptorType;

	__u8 bDescriptorSubtype;

	__u8 bSubslotSize;

	__u8 bFormatType;

	__u8 bBitResolution;

	__u8 bHeaderLength;

	__u8 bControlSize;

	__u8 bSideBandProtocol;

} __attribute__((packed));





/* Formats - Audio Data Format Type I Codes */



struct uac_format_type_ii_discrete_descriptor {
@@ -245,11 +274,26 @@ struct uac_format_type_ii_discrete_descriptor { 
	__u8 tSamFreq[][3];

} __attribute__((packed));



struct uac_format_type_ii_ext_descriptor {

	__u8 bLength;

	__u8 bDescriptorType;

	__u8 bDescriptorSubtype;

	__u8 bFormatType;

	__u16 wMaxBitRate;

	__u16 wSamplesPerFrame;

	__u8 bHeaderLength;

	__u8 bSideBandProtocol;

} __attribute__((packed));





/* Formats - A.2 Format Type Codes */

#define UAC_FORMAT_TYPE_UNDEFINED	0x0

#define UAC_FORMAT_TYPE_I		0x1

#define UAC_FORMAT_TYPE_II		0x2

#define UAC_FORMAT_TYPE_III		0x3

#define UAC_EXT_FORMAT_TYPE_I		0x81

#define UAC_EXT_FORMAT_TYPE_II		0x82

#define UAC_EXT_FORMAT_TYPE_III		0x83



struct uac_iso_endpoint_descriptor {

	__u8  bLength;			/* in bytes: 7 */
@@ -265,6 +309,19 @@ struct uac_iso_endpoint_descriptor { 
#define UAC_EP_CS_ATTR_PITCH_CONTROL	0x02

#define UAC_EP_CS_ATTR_FILL_MAX		0x80



/* Audio class v2.0: CLOCK_SOURCE descriptor */



struct uac_clock_source_descriptor {

	__u8 bLength;

	__u8 bDescriptorType;

	__u8 bDescriptorSubtype;

	__u8 bClockID;

	__u8 bmAttributes;

	__u8 bmControls;

	__u8 bAssocTerminal;

	__u8 iClockSource;

} __attribute__((packed));



/* A.10.2 Feature Unit Control Selectors */



struct uac_feature_unit_descriptor {

sound/usb/usbaudio.h

+16 −3
Original line number Diff line number Diff line
@@ -36,8 +36,17 @@ 
#define MIXER_UNIT			0x04

#define SELECTOR_UNIT			0x05

#define FEATURE_UNIT			0x06

#define PROCESSING_UNIT			0x07

#define EXTENSION_UNIT			0x08

#define PROCESSING_UNIT_V1		0x07

#define EXTENSION_UNIT_V1		0x08



/* audio class v2 */

#define EFFECT_UNIT			0x07

#define PROCESSING_UNIT_V2		0x08

#define EXTENSION_UNIT_V2		0x09

#define CLOCK_SOURCE			0x0a

#define CLOCK_SELECTOR			0x0b

#define CLOCK_MULTIPLIER		0x0c

#define SAMPLE_RATE_CONVERTER		0x0d



#define AS_GENERAL			0x01

#define FORMAT_TYPE			0x02
@@ -60,7 +69,7 @@ 
#define EP_CS_ATTR_PITCH_CONTROL	0x02

#define EP_CS_ATTR_FILL_MAX		0x80



/* Audio Class specific Request Codes */

/* Audio Class specific Request Codes (v1) */



#define SET_CUR    0x01

#define GET_CUR    0x81
@@ -74,6 +83,10 @@ 
#define GET_MEM    0x85

#define GET_STAT   0xff



/* Audio Class specific Request Codes (v2) */

#define CS_CUR     0x01

#define CS_RANGE   0x02



/* Terminal Control Selectors */



#define COPY_PROTECT_CONTROL       0x01

sound/usb/usbmixer.c

+7 −7
Original line number Diff line number Diff line
@@ -286,7 +286,7 @@ static void *find_audio_control_unit(struct mixer_build *state, unsigned char un 
	p = NULL;

	while ((p = snd_usb_find_desc(state->buffer, state->buflen, p,

				      USB_DT_CS_INTERFACE)) != NULL) {

		if (p[0] >= 4 && p[2] >= INPUT_TERMINAL && p[2] <= EXTENSION_UNIT && p[3] == unit)

		if (p[0] >= 4 && p[2] >= INPUT_TERMINAL && p[2] <= EXTENSION_UNIT_V1 && p[3] == unit)

			return p;

	}

	return NULL;
@@ -607,9 +607,9 @@ static int get_term_name(struct mixer_build *state, struct usb_audio_term *iterm 
		switch (iterm->type >> 16) {

		case SELECTOR_UNIT:

			strcpy(name, "Selector"); return 8;

		case PROCESSING_UNIT:

		case PROCESSING_UNIT_V1:

			strcpy(name, "Process Unit"); return 12;

		case EXTENSION_UNIT:

		case EXTENSION_UNIT_V1:

			strcpy(name, "Ext Unit"); return 8;

		case MIXER_UNIT:

			strcpy(name, "Mixer"); return 5;
@@ -673,8 +673,8 @@ static int check_input_term(struct mixer_build *state, int id, struct usb_audio_ 
			term->id = id;

			term->name = p1[9 + p1[0] - 1];

			return 0;

		case PROCESSING_UNIT:

		case EXTENSION_UNIT:

		case PROCESSING_UNIT_V1:

		case EXTENSION_UNIT_V1:

			if (p1[6] == 1) {

				id = p1[7];

				break; /* continue to parse */
@@ -1747,9 +1747,9 @@ static int parse_audio_unit(struct mixer_build *state, int unitid) 
		return parse_audio_selector_unit(state, unitid, p1);

	case FEATURE_UNIT:

		return parse_audio_feature_unit(state, unitid, p1);

	case PROCESSING_UNIT:

	case PROCESSING_UNIT_V1:

		return parse_audio_processing_unit(state, unitid, p1);

	case EXTENSION_UNIT:

	case EXTENSION_UNIT_V1:

		return parse_audio_extension_unit(state, unitid, p1);

	default:

		snd_printk(KERN_ERR "usbaudio: unit %u: unexpected type 0x%02x\n", unitid, p1[2]);