tps6594-pwrbutton.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * power button driver for TI TPS6594 PMICs
  4 *
  5 * Copyright (C) 2025 Critical Link LLC - https://www.criticallink.com/
  6 */
  7#include <linux/init.h>
  8#include <linux/input.h>
  9#include <linux/interrupt.h>
 10#include <linux/kernel.h>
 11#include <linux/mfd/tps6594.h>
 12#include <linux/module.h>
 13#include <linux/platform_device.h>
 14#include <linux/regmap.h>
 15#include <linux/slab.h>
 16
 17struct tps6594_pwrbutton {
 18	struct device *dev;
 19	struct input_dev *idev;
 20	char phys[32];
 21};
 22
 23static irqreturn_t tps6594_pb_push_irq(int irq, void *_pwr)
 24{
 25	struct tps6594_pwrbutton *pwr = _pwr;
 26
 27	input_report_key(pwr->idev, KEY_POWER, 1);
 28	pm_wakeup_event(pwr->dev, 0);
 29	input_sync(pwr->idev);
 30
 31	return IRQ_HANDLED;
 32}
 33
 34static irqreturn_t tps6594_pb_release_irq(int irq, void *_pwr)
 35{
 36	struct tps6594_pwrbutton *pwr = _pwr;
 37
 38	input_report_key(pwr->idev, KEY_POWER, 0);
 39	input_sync(pwr->idev);
 40
 41	return IRQ_HANDLED;
 42}
 43
 44static int tps6594_pb_probe(struct platform_device *pdev)
 45{
 46	struct device *dev = &pdev->dev;
 47	struct tps6594_pwrbutton *pwr;
 48	struct input_dev *idev;
 49	int error;
 50	int push_irq;
 51	int release_irq;
 52
 53	pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
 54	if (!pwr)
 55		return -ENOMEM;
 56
 57	idev = devm_input_allocate_device(dev);
 58	if (!idev)
 59		return -ENOMEM;
 60
 61	idev->name = pdev->name;
 62	snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0",
 63		 pdev->name);
 64	idev->phys = pwr->phys;
 65	idev->id.bustype = BUS_I2C;
 66
 67	input_set_capability(idev, EV_KEY, KEY_POWER);
 68
 69	pwr->dev = dev;
 70	pwr->idev = idev;
 71	device_init_wakeup(dev, true);
 72
 73	push_irq = platform_get_irq(pdev, 0);
 74	if (push_irq < 0)
 75		return -EINVAL;
 76
 77	release_irq = platform_get_irq(pdev, 1);
 78	if (release_irq < 0)
 79		return -EINVAL;
 80
 81	error = devm_request_threaded_irq(dev, push_irq, NULL,
 82					  tps6594_pb_push_irq,
 83					  IRQF_ONESHOT,
 84					  pdev->resource[0].name, pwr);
 85	if (error) {
 86		dev_err(dev, "failed to request push IRQ #%d: %d\n", push_irq,
 87			error);
 88		return error;
 89	}
 90
 91	error = devm_request_threaded_irq(dev, release_irq, NULL,
 92					  tps6594_pb_release_irq,
 93					  IRQF_ONESHOT,
 94					  pdev->resource[1].name, pwr);
 95	if (error) {
 96		dev_err(dev, "failed to request release IRQ #%d: %d\n",
 97			release_irq, error);
 98		return error;
 99	}
100
101	error = input_register_device(idev);
102	if (error) {
103		dev_err(dev, "Can't register power button: %d\n", error);
104		return error;
105	}
106
107	return 0;
108}
109
110static const struct platform_device_id tps6594_pwrbtn_id_table[] = {
111	{ "tps6594-pwrbutton", },
112	{ /* sentinel */ }
113};
114MODULE_DEVICE_TABLE(platform, tps6594_pwrbtn_id_table);
115
116static struct platform_driver tps6594_pb_driver = {
117	.probe = tps6594_pb_probe,
118	.driver = {
119		.name = "tps6594_pwrbutton",
120	},
121	.id_table = tps6594_pwrbtn_id_table,
122};
123module_platform_driver(tps6594_pb_driver);
124
125MODULE_DESCRIPTION("TPS6594 Power Button");
126MODULE_LICENSE("GPL");