sound/usb/usx2y/us144mkii.c

Source file repositories/reference/linux-study-clean/sound/usb/usx2y/us144mkii.c

File Facts

System
Linux kernel
Corpus path
sound/usb/usx2y/us144mkii.c
Extension
.c
Size
18502 bytes
Lines
625
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

if (tascam->playback_urbs[i]) {
			usb_free_coherent(
				tascam->dev, tascam->playback_urb_alloc_size,
				tascam->playback_urbs[i]->transfer_buffer,
				tascam->playback_urbs[i]->transfer_dma);
			usb_free_urb(tascam->playback_urbs[i]);
			tascam->playback_urbs[i] = NULL;
		}
	}

	usb_kill_anchored_urbs(&tascam->feedback_anchor);
	for (i = 0; i < NUM_FEEDBACK_URBS; i++) {
		if (tascam->feedback_urbs[i]) {
			usb_free_coherent(
				tascam->dev, tascam->feedback_urb_alloc_size,
				tascam->feedback_urbs[i]->transfer_buffer,
				tascam->feedback_urbs[i]->transfer_dma);
			usb_free_urb(tascam->feedback_urbs[i]);
			tascam->feedback_urbs[i] = NULL;
		}
	}

	usb_kill_anchored_urbs(&tascam->capture_anchor);
	for (i = 0; i < NUM_CAPTURE_URBS; i++) {
		if (tascam->capture_urbs[i]) {
			usb_free_coherent(
				tascam->dev, tascam->capture_urb_alloc_size,
				tascam->capture_urbs[i]->transfer_buffer,
				tascam->capture_urbs[i]->transfer_dma);
			usb_free_urb(tascam->capture_urbs[i]);
			tascam->capture_urbs[i] = NULL;
		}
	}

	usb_kill_anchored_urbs(&tascam->midi_in_anchor);
	for (i = 0; i < NUM_MIDI_IN_URBS; i++) {
		if (tascam->midi_in_urbs[i]) {
			usb_free_coherent(
				tascam->dev, MIDI_IN_BUF_SIZE,
				tascam->midi_in_urbs[i]->transfer_buffer,
				tascam->midi_in_urbs[i]->transfer_dma);
			usb_free_urb(tascam->midi_in_urbs[i]);
			tascam->midi_in_urbs[i] = NULL;
		}
	}

	usb_kill_anchored_urbs(&tascam->midi_out_anchor);
	for (i = 0; i < NUM_MIDI_OUT_URBS; i++) {
		if (tascam->midi_out_urbs[i]) {
			usb_free_coherent(
				tascam->dev, MIDI_OUT_BUF_SIZE,
				tascam->midi_out_urbs[i]->transfer_buffer,
				tascam->midi_out_urbs[i]->transfer_dma);
			usb_free_urb(tascam->midi_out_urbs[i]);
			tascam->midi_out_urbs[i] = NULL;
		}
	}

	kfree(tascam->capture_routing_buffer);
	tascam->capture_routing_buffer = NULL;
	kfree(tascam->capture_decode_dst_block);
	tascam->capture_decode_dst_block = NULL;
	kfree(tascam->capture_decode_raw_block);
	tascam->capture_decode_raw_block = NULL;
	kfree(tascam->capture_ring_buffer);
	tascam->capture_ring_buffer = NULL;
}

int tascam_alloc_urbs(struct tascam_card *tascam)
{
	int i;
	size_t max_packet_size;

	max_packet_size = ((96000 / 8000) + 2) * BYTES_PER_FRAME;
	tascam->playback_urb_alloc_size =
		max_packet_size * PLAYBACK_URB_PACKETS;

	for (i = 0; i < NUM_PLAYBACK_URBS; i++) {
		struct urb *urb =
			usb_alloc_urb(PLAYBACK_URB_PACKETS, GFP_KERNEL);

		if (!urb)
			goto error;
		tascam->playback_urbs[i] = urb;

		urb->transfer_buffer = usb_alloc_coherent(
			tascam->dev, tascam->playback_urb_alloc_size,
			GFP_KERNEL, &urb->transfer_dma);
		if (!urb->transfer_buffer)
			goto error;

Annotation

Implementation Notes