1// SPDX-License-Identifier: GPL-2.0
  2//
  3// Driver for TPS65219 Push Button
  4//
  5// Copyright (C) 2022 BayLibre Incorporated - https://www.baylibre.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/tps65219.h>
 12#include <linux/module.h>
 13#include <linux/of.h>
 14#include <linux/platform_device.h>
 15#include <linux/regmap.h>
 16#include <linux/slab.h>
 17
 18struct tps65219_pwrbutton {
 19	struct device *dev;
 20	struct input_dev *idev;
 21	char phys[32];
 22};
 23
 24static irqreturn_t tps65219_pb_push_irq(int irq, void *_pwr)
 25{
 26	struct tps65219_pwrbutton *pwr = _pwr;
 27
 28	input_report_key(pwr->idev, KEY_POWER, 1);
 29	pm_wakeup_event(pwr->dev, 0);
 30	input_sync(pwr->idev);
 31
 32	return IRQ_HANDLED;
 33}
 34
 35static irqreturn_t tps65219_pb_release_irq(int irq, void *_pwr)
 36{
 37	struct tps65219_pwrbutton *pwr = _pwr;
 38
 39	input_report_key(pwr->idev, KEY_POWER, 0);
 40	input_sync(pwr->idev);
 41
 42	return IRQ_HANDLED;
 43}
 44
 45static int tps65219_pb_probe(struct platform_device *pdev)
 46{
 47	struct tps65219 *tps = dev_get_drvdata(pdev->dev.parent);
 48	struct device *dev = &pdev->dev;
 49	struct tps65219_pwrbutton *pwr;
 50	struct input_dev *idev;
 51	int error;
 52	int push_irq;
 53	int release_irq;
 54
 55	pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
 56	if (!pwr)
 57		return -ENOMEM;
 58
 59	idev = devm_input_allocate_device(dev);
 60	if (!idev)
 61		return -ENOMEM;
 62
 63	idev->name = pdev->name;
 64	snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0",
 65		 pdev->name);
 66	idev->phys = pwr->phys;
 67	idev->id.bustype = BUS_I2C;
 68
 69	input_set_capability(idev, EV_KEY, KEY_POWER);
 70
 71	pwr->dev = dev;
 72	pwr->idev = idev;
 73	device_init_wakeup(dev, true);
 74
 75	push_irq = platform_get_irq(pdev, 0);
 76	if (push_irq < 0)
 77		return -EINVAL;
 78
 79	release_irq = platform_get_irq(pdev, 1);
 80	if (release_irq < 0)
 81		return -EINVAL;
 82
 83	error = devm_request_threaded_irq(dev, push_irq, NULL,
 84					  tps65219_pb_push_irq,
 85					  IRQF_ONESHOT,
 86					  dev->init_name, pwr);
 87	if (error) {
 88		dev_err(dev, "failed to request push IRQ #%d: %d\n", push_irq,
 89			error);
 90		return error;
 91	}
 92
 93	error = devm_request_threaded_irq(dev, release_irq, NULL,
 94					  tps65219_pb_release_irq,
 95					  IRQF_ONESHOT,
 96					  dev->init_name, pwr);
 97	if (error) {
 98		dev_err(dev, "failed to request release IRQ #%d: %d\n",
 99			release_irq, error);
100		return error;
101	}
102
103	error = input_register_device(idev);
104	if (error) {
105		dev_err(dev, "Can't register power button: %d\n", error);
106		return error;
107	}
108
109	/* Enable interrupts for the pushbutton */
110	regmap_clear_bits(tps->regmap, TPS65219_REG_MASK_CONFIG,
111			  TPS65219_REG_MASK_INT_FOR_PB_MASK);
112
113	/* Set PB/EN/VSENSE pin to be a pushbutton */
114	regmap_update_bits(tps->regmap, TPS65219_REG_MFP_2_CONFIG,
115			   TPS65219_MFP_2_EN_PB_VSENSE_MASK, TPS65219_MFP_2_PB);
116
117	return 0;
118}
119
120static int tps65219_pb_remove(struct platform_device *pdev)
121{
122	struct tps65219 *tps = dev_get_drvdata(pdev->dev.parent);
123
124	/* Disable interrupt for the pushbutton */
125	return regmap_update_bits(tps->regmap, TPS65219_REG_MASK_CONFIG,
126				  TPS65219_REG_MASK_INT_FOR_PB_MASK,
127				  TPS65219_REG_MASK_INT_FOR_PB_MASK);
128}
129
130static const struct platform_device_id tps65219_pwrbtn_id_table[] = {
131	{ "tps65219-pwrbutton", },
132	{ /* sentinel */ }
133};
134MODULE_DEVICE_TABLE(platform, tps65219_pwrbtn_id_table);
135
136static struct platform_driver tps65219_pb_driver = {
137	.probe = tps65219_pb_probe,
138	.remove = tps65219_pb_remove,
139	.driver = {
140		.name = "tps65219_pwrbutton",
141	},
142	.id_table = tps65219_pwrbtn_id_table,
143};
144module_platform_driver(tps65219_pb_driver);
145
146MODULE_DESCRIPTION("TPS65219 Power Button");
147MODULE_LICENSE("GPL");
148MODULE_AUTHOR("Markus Schneider-Pargmann <msp@baylibre.com");