1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Texas Instruments' TPS65217 and TPS65218 Power Button Input Driver
4 *
5 * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
6 * Author: Felipe Balbi <balbi@ti.com>
7 * Author: Marcin Niestroj <m.niestroj@grinn-global.com>
8 */
9
10#include <linux/init.h>
11#include <linux/input.h>
12#include <linux/interrupt.h>
13#include <linux/kernel.h>
14#include <linux/mfd/tps65217.h>
15#include <linux/mfd/tps65218.h>
16#include <linux/module.h>
17#include <linux/of.h>
18#include <linux/platform_device.h>
19#include <linux/regmap.h>
20#include <linux/slab.h>
21
22struct tps6521x_data {
23	unsigned int reg_status;
24	unsigned int pb_mask;
25	const char *name;
26};
27
28static const struct tps6521x_data tps65217_data = {
29	.reg_status = TPS65217_REG_STATUS,
30	.pb_mask = TPS65217_STATUS_PB,
31	.name = "tps65217_pwrbutton",
32};
33
34static const struct tps6521x_data tps65218_data = {
35	.reg_status = TPS65218_REG_STATUS,
36	.pb_mask = TPS65218_STATUS_PB_STATE,
37	.name = "tps65218_pwrbutton",
38};
39
40struct tps6521x_pwrbutton {
41	struct device *dev;
42	struct regmap *regmap;
43	struct input_dev *idev;
44	const struct tps6521x_data *data;
45	char phys[32];
46};
47
48static const struct of_device_id of_tps6521x_pb_match[] = {
49	{ .compatible = "ti,tps65217-pwrbutton", .data = &tps65217_data },
50	{ .compatible = "ti,tps65218-pwrbutton", .data = &tps65218_data },
51	{ },
52};
53MODULE_DEVICE_TABLE(of, of_tps6521x_pb_match);
54
55static irqreturn_t tps6521x_pb_irq(int irq, void *_pwr)
56{
57	struct tps6521x_pwrbutton *pwr = _pwr;
58	const struct tps6521x_data *tps_data = pwr->data;
59	unsigned int reg;
60	int error;
61
62	error = regmap_read(pwr->regmap, tps_data->reg_status, &reg);
63	if (error) {
64		dev_err(pwr->dev, "can't read register: %d\n", error);
65		goto out;
66	}
67
68	if (reg & tps_data->pb_mask) {
69		input_report_key(pwr->idev, KEY_POWER, 1);
70		pm_wakeup_event(pwr->dev, 0);
71	} else {
72		input_report_key(pwr->idev, KEY_POWER, 0);
73	}
74
75	input_sync(pwr->idev);
76
77out:
78	return IRQ_HANDLED;
79}
80
81static int tps6521x_pb_probe(struct platform_device *pdev)
82{
83	struct device *dev = &pdev->dev;
84	struct tps6521x_pwrbutton *pwr;
85	struct input_dev *idev;
86	const struct of_device_id *match;
87	int error;
88	int irq;
89
90	match = of_match_node(of_tps6521x_pb_match, dev->of_node);
91	if (!match)
92		return -ENXIO;
93
94	pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
95	if (!pwr)
96		return -ENOMEM;
97
98	pwr->data = match->data;
99
100	idev = devm_input_allocate_device(dev);
101	if (!idev)
102		return -ENOMEM;
103
104	idev->name = pwr->data->name;
105	snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0",
106		pwr->data->name);
107	idev->phys = pwr->phys;
108	idev->dev.parent = dev;
109	idev->id.bustype = BUS_I2C;
110
111	input_set_capability(idev, EV_KEY, KEY_POWER);
112
113	pwr->regmap = dev_get_regmap(dev->parent, NULL);
114	pwr->dev = dev;
115	pwr->idev = idev;
116	device_init_wakeup(dev, true);
117
118	irq = platform_get_irq(pdev, 0);
119	if (irq < 0)
120		return -EINVAL;
121
122	error = devm_request_threaded_irq(dev, irq, NULL, tps6521x_pb_irq,
123					  IRQF_TRIGGER_RISING |
124						IRQF_TRIGGER_FALLING |
125						IRQF_ONESHOT,
126					  pwr->data->name, pwr);
127	if (error) {
128		dev_err(dev, "failed to request IRQ #%d: %d\n", irq, error);
129		return error;
130	}
131
132	error= input_register_device(idev);
133	if (error) {
134		dev_err(dev, "Can't register power button: %d\n", error);
135		return error;
136	}
137
138	return 0;
139}
140
141static const struct platform_device_id tps6521x_pwrbtn_id_table[] = {
142	{ "tps65218-pwrbutton", },
143	{ "tps65217-pwrbutton", },
144	{ /* sentinel */ }
145};
146MODULE_DEVICE_TABLE(platform, tps6521x_pwrbtn_id_table);
147
148static struct platform_driver tps6521x_pb_driver = {
149	.probe	= tps6521x_pb_probe,
150	.driver	= {
151		.name	= "tps6521x_pwrbutton",
152		.of_match_table = of_tps6521x_pb_match,
153	},
154	.id_table = tps6521x_pwrbtn_id_table,
155};
156module_platform_driver(tps6521x_pb_driver);
157
158MODULE_DESCRIPTION("TPS6521X Power Button");
159MODULE_LICENSE("GPL v2");
160MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
161