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 void tps65219_pb_remove(struct platform_device *pdev)
121{
122	struct tps65219 *tps = dev_get_drvdata(pdev->dev.parent);
123	int ret;
124
125	/* Disable interrupt for the pushbutton */
126	ret = regmap_set_bits(tps->regmap, TPS65219_REG_MASK_CONFIG,
127			      TPS65219_REG_MASK_INT_FOR_PB_MASK);
128	if (ret)
129		dev_warn(&pdev->dev, "Failed to disable irq (%pe)\n", ERR_PTR(ret));
130}
131
132static const struct platform_device_id tps65219_pwrbtn_id_table[] = {
133	{ "tps65219-pwrbutton", },
134	{ /* sentinel */ }
135};
136MODULE_DEVICE_TABLE(platform, tps65219_pwrbtn_id_table);
137
138static struct platform_driver tps65219_pb_driver = {
139	.probe = tps65219_pb_probe,
140	.remove_new = tps65219_pb_remove,
141	.driver = {
142		.name = "tps65219_pwrbutton",
143	},
144	.id_table = tps65219_pwrbtn_id_table,
145};
146module_platform_driver(tps65219_pb_driver);
147
148MODULE_DESCRIPTION("TPS65219 Power Button");
149MODULE_LICENSE("GPL");
150MODULE_AUTHOR("Markus Schneider-Pargmann <msp@baylibre.com");
151