drivers/input/misc/rk805-pwrkey.c

Source file repositories/reference/linux-study-clean/drivers/input/misc/rk805-pwrkey.c

File Facts

System
Linux kernel
Corpus path
drivers/input/misc/rk805-pwrkey.c
Extension
.c
Size
2371 bytes
Lines
105
Domain
Driver Families
Bucket
drivers/input
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-or-later
/*
 * Rockchip RK805 PMIC Power Key driver
 *
 * Copyright (c) 2017, Fuzhou Rockchip Electronics Co., Ltd
 *
 * Author: Joseph Chen <chenjh@rock-chips.com>
 */

#include <linux/errno.h>
#include <linux/init.h>
#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/platform_device.h>

static irqreturn_t pwrkey_fall_irq(int irq, void *_pwr)
{
	struct input_dev *pwr = _pwr;

	input_report_key(pwr, KEY_POWER, 1);
	input_sync(pwr);

	return IRQ_HANDLED;
}

static irqreturn_t pwrkey_rise_irq(int irq, void *_pwr)
{
	struct input_dev *pwr = _pwr;

	input_report_key(pwr, KEY_POWER, 0);
	input_sync(pwr);

	return IRQ_HANDLED;
}

static int rk805_pwrkey_probe(struct platform_device *pdev)
{
	struct input_dev *pwr;
	int fall_irq, rise_irq;
	int err;

	pwr = devm_input_allocate_device(&pdev->dev);
	if (!pwr) {
		dev_err(&pdev->dev, "Can't allocate power button\n");
		return -ENOMEM;
	}

	pwr->name = "rk805 pwrkey";
	pwr->phys = "rk805_pwrkey/input0";
	pwr->id.bustype = BUS_HOST;
	input_set_capability(pwr, EV_KEY, KEY_POWER);

	fall_irq = platform_get_irq(pdev, 0);
	if (fall_irq < 0)
		return fall_irq;

	rise_irq = platform_get_irq(pdev, 1);
	if (rise_irq < 0)
		return rise_irq;

	err = devm_request_any_context_irq(&pwr->dev, fall_irq,
					   pwrkey_fall_irq,
					   IRQF_TRIGGER_FALLING | IRQF_ONESHOT,
					   "rk805_pwrkey_fall", pwr);
	if (err < 0) {
		dev_err(&pdev->dev, "Can't register fall irq: %d\n", err);
		return err;
	}

	err = devm_request_any_context_irq(&pwr->dev, rise_irq,
					   pwrkey_rise_irq,
					   IRQF_TRIGGER_RISING | IRQF_ONESHOT,
					   "rk805_pwrkey_rise", pwr);
	if (err < 0) {
		dev_err(&pdev->dev, "Can't register rise irq: %d\n", err);
		return err;
	}

	err = input_register_device(pwr);
	if (err) {
		dev_err(&pdev->dev, "Can't register power button: %d\n", err);
		return err;
	}

	platform_set_drvdata(pdev, pwr);
	device_init_wakeup(&pdev->dev, true);

	return 0;

Annotation

Implementation Notes