sound/usb/mixer_maps.c

Source file repositories/reference/linux-study-clean/sound/usb/mixer_maps.c

File Facts

System
Linux kernel
Corpus path
sound/usb/mixer_maps.c
Extension
.c
Size
22581 bytes
Lines
775
Domain
Driver Families
Bucket
sound/usb
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct usbmix_dB_map {
	int min;
	int max;
	bool min_mute;
};

struct usbmix_name_map {
	int id;
	const char *name;
	int control;
	const struct usbmix_dB_map *dB;
};

struct usbmix_selector_map {
	int id;
	int count;
	const char **names;
};

struct usbmix_ctl_map {
	u32 id;
	const struct usbmix_name_map *map;
	const struct usbmix_selector_map *selector_map;
	const struct usbmix_connector_map *connector_map;
};

/*
 * USB control mappers for SB Exitigy
 */

/*
 * Topology of SB Extigy (see on the wide screen :)

USB_IN[1] --->FU[2]------------------------------+->MU[16]-->PU[17]-+->FU[18]--+->EU[27]--+->EU[21]-->FU[22]--+->FU[23] > Dig_OUT[24]
                                                 ^                  |          |          |                   |
USB_IN[3] -+->SU[5]-->FU[6]--+->MU[14] ->PU[15]->+                  |          |          |                   +->FU[25] > Dig_OUT[26]
           ^                 ^                   |                  |          |          |
Dig_IN[4] -+                 |                   |                  |          |          +->FU[28]---------------------> Spk_OUT[19]
                             |                   |                  |          |
Lin-IN[7] -+-->FU[8]---------+                   |                  |          +----------------------------------------> Hph_OUT[20]
           |                                     |                  |
Mic-IN[9] --+->FU[10]----------------------------+                  |
           ||                                                       |
           ||  +----------------------------------------------------+
           VV  V
           ++--+->SU[11]-->FU[12] --------------------------------------------------------------------------------------> USB_OUT[13]
*/

static const struct usbmix_name_map extigy_map[] = {
	/* 1: IT pcm */
	{ 2, "PCM Playback" }, /* FU */
	/* 3: IT pcm */
	/* 4: IT digital in */
	{ 5, NULL }, /* DISABLED: this seems to be bogus on some firmware */
	{ 6, "Digital In" }, /* FU */
	/* 7: IT line */
	{ 8, "Line Playback" }, /* FU */
	/* 9: IT mic */
	{ 10, "Mic Playback" }, /* FU */
	{ 11, "Capture Source" }, /* SU */
	{ 12, "Capture" }, /* FU */
	/* 13: OT pcm capture */
	/* 14: MU (w/o controls) */
	/* 15: PU (3D enh) */
	/* 16: MU (w/o controls) */
	{ 17, NULL, 1 }, /* DISABLED: PU-switch (any effect?) */
	{ 17, "Channel Routing", 2 },	/* PU: mode select */
	{ 18, "Tone Control - Bass", UAC_FU_BASS }, /* FU */
	{ 18, "Tone Control - Treble", UAC_FU_TREBLE }, /* FU */
	{ 18, "Master Playback" }, /* FU; others */
	/* 19: OT speaker */
	/* 20: OT headphone */
	{ 21, NULL }, /* DISABLED: EU (for what?) */
	{ 22, "Digital Out Playback" }, /* FU */
	{ 23, "Digital Out1 Playback" }, /* FU */  /* FIXME: corresponds to 24 */
	/* 24: OT digital out */
	{ 25, "IEC958 Optical Playback" }, /* FU */
	{ 26, "IEC958 Optical Playback" }, /* OT */
	{ 27, NULL }, /* DISABLED: EU (for what?) */
	/* 28: FU speaker (mute) */
	{ 29, NULL }, /* Digital Input Playback Source? */
	{ 0 } /* terminator */
};

/* Sound Blaster MP3+ controls mapping
 * The default mixer channels have totally misleading names,
 * e.g. no Master and fake PCM volume
 *			Pavel Mihaylov <bin@bash.info>
 */
static const struct usbmix_dB_map mp3plus_dB_1 = {.min = -4781, .max = 0};

Annotation

Implementation Notes