1// SPDX-License-Identifier: GPL-2.0
2// Copyright (C) STMicroelectronics 2018
3// Author: Pascal Paillet <p.paillet@st.com> for STMicroelectronics.
4
5#include <linux/input.h>
6#include <linux/interrupt.h>
7#include <linux/mfd/stpmic1.h>
8#include <linux/module.h>
9#include <linux/of.h>
10#include <linux/platform_device.h>
11#include <linux/property.h>
12#include <linux/regmap.h>
13
14/**
15 * struct stpmic1_onkey - OnKey data
16 * @input_dev:		pointer to input device
17 * @irq_falling:	irq that we are hooked on to
18 * @irq_rising:		irq that we are hooked on to
19 */
20struct stpmic1_onkey {
21	struct input_dev *input_dev;
22	int irq_falling;
23	int irq_rising;
24};
25
26static irqreturn_t onkey_falling_irq(int irq, void *ponkey)
27{
28	struct stpmic1_onkey *onkey = ponkey;
29	struct input_dev *input_dev = onkey->input_dev;
30
31	input_report_key(input_dev, KEY_POWER, 1);
32	pm_wakeup_event(input_dev->dev.parent, 0);
33	input_sync(input_dev);
34
35	return IRQ_HANDLED;
36}
37
38static irqreturn_t onkey_rising_irq(int irq, void *ponkey)
39{
40	struct stpmic1_onkey *onkey = ponkey;
41	struct input_dev *input_dev = onkey->input_dev;
42
43	input_report_key(input_dev, KEY_POWER, 0);
44	pm_wakeup_event(input_dev->dev.parent, 0);
45	input_sync(input_dev);
46
47	return IRQ_HANDLED;
48}
49
50static int stpmic1_onkey_probe(struct platform_device *pdev)
51{
52	struct stpmic1 *pmic = dev_get_drvdata(pdev->dev.parent);
53	struct device *dev = &pdev->dev;
54	struct input_dev *input_dev;
55	struct stpmic1_onkey *onkey;
56	unsigned int val, reg = 0;
57	int error;
58
59	onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
60	if (!onkey)
61		return -ENOMEM;
62
63	onkey->irq_falling = platform_get_irq_byname(pdev, "onkey-falling");
64	if (onkey->irq_falling < 0)
65		return onkey->irq_falling;
66
67	onkey->irq_rising = platform_get_irq_byname(pdev, "onkey-rising");
68	if (onkey->irq_rising < 0)
69		return onkey->irq_rising;
70
71	if (!device_property_read_u32(dev, "power-off-time-sec", &val)) {
72		if (val > 0 && val <= 16) {
73			dev_dbg(dev, "power-off-time=%d seconds\n", val);
74			reg |= PONKEY_PWR_OFF;
75			reg |= ((16 - val) & PONKEY_TURNOFF_TIMER_MASK);
76		} else {
77			dev_err(dev, "power-off-time-sec out of range\n");
78			return -EINVAL;
79		}
80	}
81
82	if (device_property_present(dev, "st,onkey-clear-cc-flag"))
83		reg |= PONKEY_CC_FLAG_CLEAR;
84
85	error = regmap_update_bits(pmic->regmap, PKEY_TURNOFF_CR,
86				   PONKEY_TURNOFF_MASK, reg);
87	if (error) {
88		dev_err(dev, "PKEY_TURNOFF_CR write failed: %d\n", error);
89		return error;
90	}
91
92	if (device_property_present(dev, "st,onkey-pu-inactive")) {
93		error = regmap_update_bits(pmic->regmap, PADS_PULL_CR,
94					   PONKEY_PU_INACTIVE,
95					   PONKEY_PU_INACTIVE);
96		if (error) {
97			dev_err(dev, "ONKEY Pads configuration failed: %d\n",
98				error);
99			return error;
100		}
101	}
102
103	input_dev = devm_input_allocate_device(dev);
104	if (!input_dev) {
105		dev_err(dev, "Can't allocate Pwr Onkey Input Device\n");
106		return -ENOMEM;
107	}
108
109	input_dev->name = "pmic_onkey";
110	input_dev->phys = "pmic_onkey/input0";
111
112	input_set_capability(input_dev, EV_KEY, KEY_POWER);
113
114	onkey->input_dev = input_dev;
115
116	/* interrupt is nested in a thread */
117	error = devm_request_threaded_irq(dev, onkey->irq_falling, NULL,
118					  onkey_falling_irq, IRQF_ONESHOT,
119					  dev_name(dev), onkey);
120	if (error) {
121		dev_err(dev, "Can't get IRQ Onkey Falling: %d\n", error);
122		return error;
123	}
124
125	error = devm_request_threaded_irq(dev, onkey->irq_rising, NULL,
126					  onkey_rising_irq, IRQF_ONESHOT,
127					  dev_name(dev), onkey);
128	if (error) {
129		dev_err(dev, "Can't get IRQ Onkey Rising: %d\n", error);
130		return error;
131	}
132
133	error = input_register_device(input_dev);
134	if (error) {
135		dev_err(dev, "Can't register power button: %d\n", error);
136		return error;
137	}
138
139	platform_set_drvdata(pdev, onkey);
140	device_init_wakeup(dev, true);
141
142	return 0;
143}
144
145static int stpmic1_onkey_suspend(struct device *dev)
146{
147	struct platform_device *pdev = to_platform_device(dev);
148	struct stpmic1_onkey *onkey = platform_get_drvdata(pdev);
149
150	if (device_may_wakeup(dev)) {
151		enable_irq_wake(onkey->irq_falling);
152		enable_irq_wake(onkey->irq_rising);
153	}
154	return 0;
155}
156
157static int stpmic1_onkey_resume(struct device *dev)
158{
159	struct platform_device *pdev = to_platform_device(dev);
160	struct stpmic1_onkey *onkey = platform_get_drvdata(pdev);
161
162	if (device_may_wakeup(dev)) {
163		disable_irq_wake(onkey->irq_falling);
164		disable_irq_wake(onkey->irq_rising);
165	}
166	return 0;
167}
168
169static DEFINE_SIMPLE_DEV_PM_OPS(stpmic1_onkey_pm,
170				stpmic1_onkey_suspend,
171				stpmic1_onkey_resume);
172
173static const struct of_device_id of_stpmic1_onkey_match[] = {
174	{ .compatible = "st,stpmic1-onkey" },
175	{ },
176};
177
178MODULE_DEVICE_TABLE(of, of_stpmic1_onkey_match);
179
180static struct platform_driver stpmic1_onkey_driver = {
181	.probe	= stpmic1_onkey_probe,
182	.driver	= {
183		.name	= "stpmic1_onkey",
184		.of_match_table = of_match_ptr(of_stpmic1_onkey_match),
185		.pm	= pm_sleep_ptr(&stpmic1_onkey_pm),
186	},
187};
188module_platform_driver(stpmic1_onkey_driver);
189
190MODULE_DESCRIPTION("Onkey driver for STPMIC1");
191MODULE_AUTHOR("Pascal Paillet <p.paillet@st.com>");
192MODULE_LICENSE("GPL v2");
193