summaryrefslogtreecommitdiffstats
path: root/drivers/input/misc/stpmic1_onkey.c
blob: 7b49c9997df7534ef9e20dfb11b9551b02e4c2af (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
// SPDX-License-Identifier: GPL-2.0
// Copyright (C) STMicroelectronics 2018
// Author: Pascal Paillet <p.paillet@st.com> for STMicroelectronics.

#include <linux/input.h>
#include <linux/interrupt.h>
#include <linux/mfd/stpmic1.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/platform_device.h>
#include <linux/property.h>
#include <linux/regmap.h>

/**
 * struct stpmic1_onkey - OnKey data
 * @input_dev:		pointer to input device
 * @irq_falling:	irq that we are hooked on to
 * @irq_rising:		irq that we are hooked on to
 */
struct stpmic1_onkey {
	struct input_dev *input_dev;
	int irq_falling;
	int irq_rising;
};

static irqreturn_t onkey_falling_irq(int irq, void *ponkey)
{
	struct stpmic1_onkey *onkey = ponkey;
	struct input_dev *input_dev = onkey->input_dev;

	input_report_key(input_dev, KEY_POWER, 1);
	pm_wakeup_event(input_dev->dev.parent, 0);
	input_sync(input_dev);

	return IRQ_HANDLED;
}

static irqreturn_t onkey_rising_irq(int irq, void *ponkey)
{
	struct stpmic1_onkey *onkey = ponkey;
	struct input_dev *input_dev = onkey->input_dev;

	input_report_key(input_dev, KEY_POWER, 0);
	pm_wakeup_event(input_dev->dev.parent, 0);
	input_sync(input_dev);

	return IRQ_HANDLED;
}

static int stpmic1_onkey_probe(struct platform_device *pdev)
{
	struct stpmic1 *pmic = dev_get_drvdata(pdev->dev.parent);
	struct device *dev = &pdev->dev;
	struct input_dev *input_dev;
	struct stpmic1_onkey *onkey;
	unsigned int val, reg = 0;
	int error;

	onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
	if (!onkey)
		return -ENOMEM;

	onkey->irq_falling = platform_get_irq_byname(pdev, "onkey-falling");
	if (onkey->irq_falling < 0) {
		dev_err(dev, "failed: request IRQ onkey-falling %d\n",
			onkey->irq_falling);
		return onkey->irq_falling;
	}

	onkey->irq_rising = platform_get_irq_byname(pdev, "onkey-rising");
	if (onkey->irq_rising < 0) {
		dev_err(dev, "failed: request IRQ onkey-rising %d\n",
			onkey->irq_rising);
		return onkey->irq_rising;
	}

	if (!device_property_read_u32(dev, "power-off-time-sec", &val)) {
		if (val > 0 && val <= 16) {
			dev_dbg(dev, "power-off-time=%d seconds\n", val);
			reg |= PONKEY_PWR_OFF;
			reg |= ((16 - val) & PONKEY_TURNOFF_TIMER_MASK);
		} else {
			dev_err(dev, "power-off-time-sec out of range\n");
			return -EINVAL;
		}
	}

	if (device_property_present(dev, "st,onkey-clear-cc-flag"))
		reg |= PONKEY_CC_FLAG_CLEAR;

	error = regmap_update_bits(pmic->regmap, PKEY_TURNOFF_CR,
				   PONKEY_TURNOFF_MASK, reg);
	if (error) {
		dev_err(dev, "PKEY_TURNOFF_CR write failed: %d\n", error);
		return error;
	}

	if (device_property_present(dev, "st,onkey-pu-inactive")) {
		error = regmap_update_bits(pmic->regmap, PADS_PULL_CR,
					   PONKEY_PU_INACTIVE,
					   PONKEY_PU_INACTIVE);
		if (error) {
			dev_err(dev, "ONKEY Pads configuration failed: %d\n",
				error);
			return error;
		}
	}

	input_dev = devm_input_allocate_device(dev);
	if (!input_dev) {
		dev_err(dev, "Can't allocate Pwr Onkey Input Device\n");
		return -ENOMEM;
	}

	input_dev->name = "pmic_onkey";
	input_dev->phys = "pmic_onkey/input0";

	input_set_capability(input_dev, EV_KEY, KEY_POWER);

	onkey->input_dev = input_dev;

	/* interrupt is nested in a thread */
	error = devm_request_threaded_irq(dev, onkey->irq_falling, NULL,
					  onkey_falling_irq, IRQF_ONESHOT,
					  dev_name(dev), onkey);
	if (error) {
		dev_err(dev, "Can't get IRQ Onkey Falling: %d\n", error);
		return error;
	}

	error = devm_request_threaded_irq(dev, onkey->irq_rising, NULL,
					  onkey_rising_irq, IRQF_ONESHOT,
					  dev_name(dev), onkey);
	if (error) {
		dev_err(dev, "Can't get IRQ Onkey Rising: %d\n", error);
		return error;
	}

	error = input_register_device(input_dev);
	if (error) {
		dev_err(dev, "Can't register power button: %d\n", error);
		return error;
	}

	platform_set_drvdata(pdev, onkey);
	device_init_wakeup(dev, true);

	return 0;
}

static int __maybe_unused stpmic1_onkey_suspend(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct stpmic1_onkey *onkey = platform_get_drvdata(pdev);

	if (device_may_wakeup(dev)) {
		enable_irq_wake(onkey->irq_falling);
		enable_irq_wake(onkey->irq_rising);
	}
	return 0;
}

static int __maybe_unused stpmic1_onkey_resume(struct device *dev)
{
	struct platform_device *pdev = to_platform_device(dev);
	struct stpmic1_onkey *onkey = platform_get_drvdata(pdev);

	if (device_may_wakeup(dev)) {
		disable_irq_wake(onkey->irq_falling);
		disable_irq_wake(onkey->irq_rising);
	}
	return 0;
}

static SIMPLE_DEV_PM_OPS(stpmic1_onkey_pm,
			 stpmic1_onkey_suspend,
			 stpmic1_onkey_resume);

static const struct of_device_id of_stpmic1_onkey_match[] = {
	{ .compatible = "st,stpmic1-onkey" },
	{ },
};

MODULE_DEVICE_TABLE(of, of_stpmic1_onkey_match);

static struct platform_driver stpmic1_onkey_driver = {
	.probe	= stpmic1_onkey_probe,
	.driver	= {
		.name	= "stpmic1_onkey",
		.of_match_table = of_match_ptr(of_stpmic1_onkey_match),
		.pm	= &stpmic1_onkey_pm,
	},
};
module_platform_driver(stpmic1_onkey_driver);

MODULE_DESCRIPTION("Onkey driver for STPMIC1");
MODULE_AUTHOR("Pascal Paillet <p.paillet@st.com>");
MODULE_LICENSE("GPL v2");