drivers/staging/media/atomisp/pci/runtime/event/src/event.c

Source file repositories/reference/linux-study-clean/drivers/staging/media/atomisp/pci/runtime/event/src/event.c

File Facts

System
Linux kernel
Corpus path
drivers/staging/media/atomisp/pci/runtime/event/src/event.c
Extension
.c
Size
2285 bytes
Lines
102
Domain
Driver Families
Bucket
drivers/staging
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

// SPDX-License-Identifier: GPL-2.0
/*
 * Support for Intel Camera Imaging ISP subsystem.
 * Copyright (c) 2010 - 2015, Intel Corporation.
 */

#include "sh_css_sp.h"

#include "dma.h"	/* N_DMA_CHANNEL_ID */

#include <type_support.h>
#include "ia_css_binary.h"
#include "sh_css_hrt.h"
#include "sh_css_defs.h"
#include "sh_css_internal.h"
#include "ia_css_debug.h"
#include "ia_css_debug_internal.h"
#include "sh_css_legacy.h"

#include "gdc_device.h"				/* HRT_GDC_N */

/*#include "sp.h"*/	/* host2sp_enqueue_frame_data() */

#include "assert_support.h"

#include "ia_css_queue.h"	/* host_sp_enqueue_XXX */
#include "ia_css_event.h"	/* ia_css_event_encode */
/*
 * @brief Encode the information into the software-event.
 * Refer to "sw_event_public.h" for details.
 */
bool ia_css_event_encode(
    u8	*in,
    u8	nr,
    uint32_t	*out)
{
	bool ret;
	u32 nr_of_bits;
	u32 i;

	assert(in);
	assert(out);
	OP___assert(nr > 0 && nr <= MAX_NR_OF_PAYLOADS_PER_SW_EVENT);

	/* initialize the output */
	*out = 0;

	/* get the number of bits per information */
	nr_of_bits = sizeof(uint32_t) * 8 / nr;

	/* compress the all inputs into a signle output */
	for (i = 0; i < nr; i++) {
		*out <<= nr_of_bits;
		*out |= in[i];
	}

	/* get the return value */
	ret = (nr > 0 && nr <= MAX_NR_OF_PAYLOADS_PER_SW_EVENT);

	return ret;
}

void ia_css_event_decode(
    u32 event,
    uint8_t *payload)
{
	assert(payload[1] == 0);
	assert(payload[2] == 0);
	assert(payload[3] == 0);

	ia_css_debug_dtrace(IA_CSS_DEBUG_TRACE_PRIVATE,
			    "ia_css_event_decode() enter:\n");

	/* First decode according to the common case
	 * In case of a PORT_EOF event we overwrite with
	 * the specific values
	 * This is somewhat ugly but probably somewhat efficient
	 * (and it avoids some code duplication)
	 */
	payload[0] = event & 0xff;  /*event_code */
	payload[1] = (event >> 8) & 0xff;
	payload[2] = (event >> 16) & 0xff;
	payload[3] = 0;

	switch (payload[0]) {
	case SH_CSS_SP_EVENT_PORT_EOF:
		payload[2] = 0;
		payload[3] = (event >> 24) & 0xff;
		break;

Annotation

Implementation Notes