drivers/nfc/s3fwrn5/phy_common.c

Source file repositories/reference/linux-study-clean/drivers/nfc/s3fwrn5/phy_common.c

File Facts

System
Linux kernel
Corpus path
drivers/nfc/s3fwrn5/phy_common.c
Extension
.c
Size
1576 bytes
Lines
76
Domain
Driver Families
Bucket
drivers/nfc
Inferred role
Driver Families: exported/initcall integration point
Status
integration 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-or-later
/*
 * Link Layer for Samsung S3FWRN5 NCI based Driver
 *
 * Copyright (C) 2015 Samsung Electronics
 * Robert Baldyga <r.baldyga@samsung.com>
 * Copyright (C) 2020 Samsung Electronics
 * Bongsu Jeon <bongsu.jeon@samsung.com>
 */

#include <linux/delay.h>
#include <linux/module.h>

#include "phy_common.h"

void s3fwrn5_phy_set_wake(void *phy_id, bool wake)
{
	struct phy_common *phy = phy_id;

	mutex_lock(&phy->mutex);
	gpiod_set_value(phy->gpio_fw_wake, wake);
	if (wake)
		msleep(S3FWRN5_EN_WAIT_TIME);
	mutex_unlock(&phy->mutex);
}
EXPORT_SYMBOL(s3fwrn5_phy_set_wake);

bool s3fwrn5_phy_power_ctrl(struct phy_common *phy, enum s3fwrn5_mode mode)
{
	if (phy->mode == mode)
		return false;

	phy->mode = mode;

	gpiod_set_value(phy->gpio_en, 1);
	gpiod_set_value(phy->gpio_fw_wake, 0);
	if (mode == S3FWRN5_MODE_FW)
		gpiod_set_value(phy->gpio_fw_wake, 1);

	if (mode != S3FWRN5_MODE_COLD) {
		msleep(S3FWRN5_EN_WAIT_TIME);
		gpiod_set_value(phy->gpio_en, 0);
		msleep(S3FWRN5_EN_WAIT_TIME);
	}

	return true;
}
EXPORT_SYMBOL(s3fwrn5_phy_power_ctrl);

void s3fwrn5_phy_set_mode(void *phy_id, enum s3fwrn5_mode mode)
{
	struct phy_common *phy = phy_id;

	mutex_lock(&phy->mutex);

	s3fwrn5_phy_power_ctrl(phy, mode);

	mutex_unlock(&phy->mutex);
}
EXPORT_SYMBOL(s3fwrn5_phy_set_mode);

enum s3fwrn5_mode s3fwrn5_phy_get_mode(void *phy_id)
{
	struct phy_common *phy = phy_id;
	enum s3fwrn5_mode mode;

	mutex_lock(&phy->mutex);

	mode = phy->mode;

	mutex_unlock(&phy->mutex);

	return mode;
}
EXPORT_SYMBOL(s3fwrn5_phy_get_mode);

Annotation

Implementation Notes