sound/usb/line6/podhd.c

Source file repositories/reference/linux-study-clean/sound/usb/line6/podhd.c

File Facts

System: Linux kernel
Corpus path: sound/usb/line6/podhd.c
Extension: .c
Size: 16237 bytes
Lines: 588
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.
Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

linux/usb.h
linux/slab.h
linux/module.h
sound/core.h
sound/control.h
sound/pcm.h
driver.h
pcm.h

Detected Declarations

struct usb_line6_podhd
function serial_number_show
function firmware_version_show
function podhd_dev_start
function podhd_startup
function podhd_disconnect
function podhd_set_monitor_level
function snd_podhd_control_monitor_info
function snd_podhd_control_monitor_get
function snd_podhd_control_monitor_put
function podhd_init
function podhd_probe

Annotated Snippet

struct usb_line6_podhd {
	/* Generic Line 6 USB data */
	struct usb_line6 line6;

	/* Serial number of device */
	u32 serial_number;

	/* Firmware version */
	int firmware_version;

	/* Monitor level */
	int monitor_level;
};

#define line6_to_podhd(x)	container_of(x, struct usb_line6_podhd, line6)

static const struct snd_ratden podhd_ratden = {
	.num_min = 48000,
	.num_max = 48000,
	.num_step = 1,
	.den = 1,
};

static struct line6_pcm_properties podhd_pcm_properties = {
	.playback_hw = {
				  .info = (SNDRV_PCM_INFO_MMAP |
					   SNDRV_PCM_INFO_INTERLEAVED |
					   SNDRV_PCM_INFO_BLOCK_TRANSFER |
					   SNDRV_PCM_INFO_MMAP_VALID |
					   SNDRV_PCM_INFO_PAUSE |
					   SNDRV_PCM_INFO_SYNC_START),
				  .formats = SNDRV_PCM_FMTBIT_S24_3LE,
				  .rates = SNDRV_PCM_RATE_48000,
				  .rate_min = 48000,
				  .rate_max = 48000,
				  .channels_min = 2,
				  .channels_max = 2,
				  .buffer_bytes_max = 60000,
				  .period_bytes_min = 64,
				  .period_bytes_max = 8192,
				  .periods_min = 1,
				  .periods_max = 1024},
	.capture_hw = {
				 .info = (SNDRV_PCM_INFO_MMAP |
					  SNDRV_PCM_INFO_INTERLEAVED |
					  SNDRV_PCM_INFO_BLOCK_TRANSFER |
					  SNDRV_PCM_INFO_MMAP_VALID |
					  SNDRV_PCM_INFO_SYNC_START),
				 .formats = SNDRV_PCM_FMTBIT_S24_3LE,
				 .rates = SNDRV_PCM_RATE_48000,
				 .rate_min = 48000,
				 .rate_max = 48000,
				 .channels_min = 2,
				 .channels_max = 2,
				 .buffer_bytes_max = 60000,
				 .period_bytes_min = 64,
				 .period_bytes_max = 8192,
				 .periods_min = 1,
				 .periods_max = 1024},
	.rates = {
			    .nrats = 1,
			    .rats = &podhd_ratden},
	.bytes_per_channel = 3 /* SNDRV_PCM_FMTBIT_S24_3LE */
};

static struct line6_pcm_properties podx3_pcm_properties = {
	.playback_hw = {
				  .info = (SNDRV_PCM_INFO_MMAP |
					   SNDRV_PCM_INFO_INTERLEAVED |
					   SNDRV_PCM_INFO_BLOCK_TRANSFER |
					   SNDRV_PCM_INFO_MMAP_VALID |
					   SNDRV_PCM_INFO_PAUSE |
					   SNDRV_PCM_INFO_SYNC_START),
				  .formats = SNDRV_PCM_FMTBIT_S24_3LE,
				  .rates = SNDRV_PCM_RATE_48000,
				  .rate_min = 48000,
				  .rate_max = 48000,
				  .channels_min = 2,
				  .channels_max = 2,
				  .buffer_bytes_max = 60000,
				  .period_bytes_min = 64,
				  .period_bytes_max = 8192,
				  .periods_min = 1,
				  .periods_max = 1024},
	.capture_hw = {
				 .info = (SNDRV_PCM_INFO_MMAP |
					  SNDRV_PCM_INFO_INTERLEAVED |
					  SNDRV_PCM_INFO_BLOCK_TRANSFER |
					  SNDRV_PCM_INFO_MMAP_VALID |
					  SNDRV_PCM_INFO_SYNC_START),

Annotation

Immediate include surface: `linux/usb.h`, `linux/slab.h`, `linux/module.h`, `sound/core.h`, `sound/control.h`, `sound/pcm.h`, `driver.h`, `pcm.h`.
Detected declarations: `struct usb_line6_podhd`, `function serial_number_show`, `function firmware_version_show`, `function podhd_dev_start`, `function podhd_startup`, `function podhd_disconnect`, `function podhd_set_monitor_level`, `function snd_podhd_control_monitor_info`, `function snd_podhd_control_monitor_get`, `function snd_podhd_control_monitor_put`.
Atlas domain: Driver Families / sound/usb.
Implementation status: source implementation candidate.

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.