sound/usb/usx2y/usbusx2yaudio.c

File Facts

System

Linux kernel

Corpus path

sound/usb/usx2y/usbusx2yaudio.c

Extension

.c

Size

26763 bytes

Lines

1009

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.

• 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.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/interrupt.h
• linux/slab.h
• linux/usb.h
• linux/moduleparam.h
• sound/core.h
• sound/info.h
• sound/pcm.h
• sound/pcm_params.h
• usx2y.h
• usbusx2y.h

Detected Declarations

• struct s_c2
• function Copyright
• function usx2y_urb_play_prepare
• function usx2y_urb_play_retire
• function usx2y_urb_submit
• function usx2y_usbframe_complete
• function usx2y_clients_stop
• function usx2y_error_urb_status
• function i_usx2y_urb_complete
• function usx2y_urbs_set_complete
• function usx2y_subs_startup_finish
• function i_usx2y_subs_startup
• function usx2y_subs_prepare
• function usx2y_urb_release
• function usx2y_urbs_release
• function usx2y_urbs_allocate
• function usx2y_subs_startup
• function usx2y_urbs_start
• function snd_usx2y_pcm_pointer
• function snd_usx2y_pcm_trigger
• function i_usx2y_04int
• function usx2y_rate_set
• function usx2y_format_set
• function snd_usx2y_pcm_hw_params
• function snd_usx2y_pcm_hw_free
• function snd_usx2y_pcm_prepare
• function snd_usx2y_pcm_open
• function snd_usx2y_pcm_close
• function usx2y_audio_stream_free
• function for_each_pcm_streams
• function snd_usx2y_pcm_private_free
• function usx2y_audio_stream_new
• function usx2y_audio_create

Annotated Snippet

struct s_c2 {
	char c1, c2;
};

static const struct s_c2 setrate_44100[] = {
	{ 0x14, 0x08},	// this line sets 44100, well actually a little less
	{ 0x18, 0x40},	// only tascam / frontier design knows the further lines .......
	{ 0x18, 0x42},
	{ 0x18, 0x45},
	{ 0x18, 0x46},
	{ 0x18, 0x48},
	{ 0x18, 0x4A},
	{ 0x18, 0x4C},
	{ 0x18, 0x4E},
	{ 0x18, 0x50},
	{ 0x18, 0x52},
	{ 0x18, 0x54},
	{ 0x18, 0x56},
	{ 0x18, 0x58},
	{ 0x18, 0x5A},
	{ 0x18, 0x5C},
	{ 0x18, 0x5E},
	{ 0x18, 0x60},
	{ 0x18, 0x62},
	{ 0x18, 0x64},
	{ 0x18, 0x66},
	{ 0x18, 0x68},
	{ 0x18, 0x6A},
	{ 0x18, 0x6C},
	{ 0x18, 0x6E},
	{ 0x18, 0x70},
	{ 0x18, 0x72},
	{ 0x18, 0x74},
	{ 0x18, 0x76},
	{ 0x18, 0x78},
	{ 0x18, 0x7A},
	{ 0x18, 0x7C},
	{ 0x18, 0x7E}
};

static const struct s_c2 setrate_48000[] = {
	{ 0x14, 0x09},	// this line sets 48000, well actually a little less
	{ 0x18, 0x40},	// only tascam / frontier design knows the further lines .......
	{ 0x18, 0x42},
	{ 0x18, 0x45},
	{ 0x18, 0x46},
	{ 0x18, 0x48},
	{ 0x18, 0x4A},
	{ 0x18, 0x4C},
	{ 0x18, 0x4E},
	{ 0x18, 0x50},
	{ 0x18, 0x52},
	{ 0x18, 0x54},
	{ 0x18, 0x56},
	{ 0x18, 0x58},
	{ 0x18, 0x5A},
	{ 0x18, 0x5C},
	{ 0x18, 0x5E},
	{ 0x18, 0x60},
	{ 0x18, 0x62},
	{ 0x18, 0x64},
	{ 0x18, 0x66},
	{ 0x18, 0x68},
	{ 0x18, 0x6A},
	{ 0x18, 0x6C},
	{ 0x18, 0x6E},
	{ 0x18, 0x70},
	{ 0x18, 0x73},
	{ 0x18, 0x74},
	{ 0x18, 0x76},
	{ 0x18, 0x78},
	{ 0x18, 0x7A},
	{ 0x18, 0x7C},
	{ 0x18, 0x7E}
};

#define NOOF_SETRATE_URBS ARRAY_SIZE(setrate_48000)

static void i_usx2y_04int(struct urb *urb)
{
	struct usx2ydev *usx2y = urb->context;

	if (urb->status)
		dev_err(&urb->dev->dev, "%s() urb->status=%i\n",
			__func__, urb->status);
	if (!--usx2y->us04->len)
		wake_up(&usx2y->in04_wait_queue);
}

static int usx2y_rate_set(struct usx2ydev *usx2y, int rate)

Annotation

• Immediate include surface: `linux/interrupt.h`, `linux/slab.h`, `linux/usb.h`, `linux/moduleparam.h`, `sound/core.h`, `sound/info.h`, `sound/pcm.h`, `sound/pcm_params.h`.
• Detected declarations: `struct s_c2`, `function Copyright`, `function usx2y_urb_play_prepare`, `function usx2y_urb_play_retire`, `function usx2y_urb_submit`, `function usx2y_usbframe_complete`, `function usx2y_clients_stop`, `function usx2y_error_urb_status`, `function i_usx2y_urb_complete`, `function usx2y_urbs_set_complete`.
• Atlas domain: Driver Families / sound/usb.
• Implementation status: source implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.