drivers/media/pci/ngene/ngene-core.c

Source file repositories/reference/linux-study-clean/drivers/media/pci/ngene/ngene-core.c

File Facts

System
Linux kernel
Corpus path
drivers/media/pci/ngene/ngene-core.c
Extension
.c
Size
44196 bytes
Lines
1714
Domain
Driver Families
Bucket
drivers/media
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 (chan->mode & NGENE_IO_TSOUT) {
			u32 Flags = chan->DataFormatFlags;
			if (Cur->ngeneBuffer.SR.Flags & 0x20)
				Flags |= BEF_OVERFLOW;
			if (chan->pBufferExchange) {
				if (!chan->pBufferExchange(chan,
							   Cur->Buffer1,
							   chan->Capture1Length,
							   Cur->ngeneBuffer.SR.
							   Clock, Flags)) {
					/*
					   We didn't get data
					   Clear in service flag to make sure we
					   get called on next interrupt again.
					   leave fill/empty (0x80) flag alone
					   to avoid hardware running out of
					   buffers during startup, we hold only
					   in run state ( the source may be late
					   delivering data )
					*/

					if (chan->HWState == HWSTATE_RUN) {
						Cur->ngeneBuffer.SR.Flags &=
							~0x40;
						break;
						/* Stop processing stream */
					}
				} else {
					/* We got a valid buffer,
					   so switch to run state */
					chan->HWState = HWSTATE_RUN;
				}
			} else {
				dev_err(pdev, "OOPS\n");
				if (chan->HWState == HWSTATE_RUN) {
					Cur->ngeneBuffer.SR.Flags &= ~0x40;
					break;	/* Stop processing stream */
				}
			}
			if (chan->AudioDTOUpdated) {
				dev_info(pdev, "Update AudioDTO = %d\n",
					 chan->AudioDTOValue);
				Cur->ngeneBuffer.SR.DTOUpdate =
					chan->AudioDTOValue;
				chan->AudioDTOUpdated = 0;
			}
		} else {
			if (chan->HWState == HWSTATE_RUN) {
				u32 Flags = chan->DataFormatFlags;
				IBufferExchange *exch1 = chan->pBufferExchange;
				IBufferExchange *exch2 = chan->pBufferExchange2;
				if (Cur->ngeneBuffer.SR.Flags & 0x01)
					Flags |= BEF_EVEN_FIELD;
				if (Cur->ngeneBuffer.SR.Flags & 0x20)
					Flags |= BEF_OVERFLOW;
				spin_unlock_irq(&chan->state_lock);
				if (exch1)
					exch1(chan, Cur->Buffer1,
						chan->Capture1Length,
						Cur->ngeneBuffer.SR.Clock,
						Flags);
				if (exch2)
					exch2(chan, Cur->Buffer2,
						chan->Capture2Length,
						Cur->ngeneBuffer.SR.Clock,
						Flags);
				spin_lock_irq(&chan->state_lock);
			} else if (chan->HWState != HWSTATE_STOP)
				chan->HWState = HWSTATE_RUN;
		}
		Cur->ngeneBuffer.SR.Flags = 0x00;
		Cur = Cur->Next;
	}
	chan->nextBuffer = Cur;

	spin_unlock_irq(&chan->state_lock);
}

static irqreturn_t irq_handler(int irq, void *dev_id)
{
	struct ngene *dev = (struct ngene *)dev_id;
	struct device *pdev = &dev->pci_dev->dev;
	u32 icounts = 0;
	irqreturn_t rc = IRQ_NONE;
	u32 i = MAX_STREAM;
	u8 *tmpCmdDoneByte;

	if (dev->BootFirmware) {
		icounts = ngreadl(NGENE_INT_COUNTS);
		if (icounts != dev->icounts) {

Annotation

Implementation Notes