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 dev_err(dev, "failed: request IRQ onkey-falling %d\n",
66 onkey->irq_falling);
67 return onkey->irq_falling;
68 }
69
70 onkey->irq_rising = platform_get_irq_byname(pdev, "onkey-rising");
71 if (onkey->irq_rising < 0) {
72 dev_err(dev, "failed: request IRQ onkey-rising %d\n",
73 onkey->irq_rising);
74 return onkey->irq_rising;
75 }
76
77 if (!device_property_read_u32(dev, "power-off-time-sec", &val)) {
78 if (val > 0 && val <= 16) {
79 dev_dbg(dev, "power-off-time=%d seconds\n", val);
80 reg |= PONKEY_PWR_OFF;
81 reg |= ((16 - val) & PONKEY_TURNOFF_TIMER_MASK);
82 } else {
83 dev_err(dev, "power-off-time-sec out of range\n");
84 return -EINVAL;
85 }
86 }
87
88 if (device_property_present(dev, "st,onkey-clear-cc-flag"))
89 reg |= PONKEY_CC_FLAG_CLEAR;
90
91 error = regmap_update_bits(pmic->regmap, PKEY_TURNOFF_CR,
92 PONKEY_TURNOFF_MASK, reg);
93 if (error) {
94 dev_err(dev, "PKEY_TURNOFF_CR write failed: %d\n", error);
95 return error;
96 }
97
98 if (device_property_present(dev, "st,onkey-pu-inactive")) {
99 error = regmap_update_bits(pmic->regmap, PADS_PULL_CR,
100 PONKEY_PU_INACTIVE,
101 PONKEY_PU_INACTIVE);
102 if (error) {
103 dev_err(dev, "ONKEY Pads configuration failed: %d\n",
104 error);
105 return error;
106 }
107 }
108
109 input_dev = devm_input_allocate_device(dev);
110 if (!input_dev) {
111 dev_err(dev, "Can't allocate Pwr Onkey Input Device\n");
112 return -ENOMEM;
113 }
114
115 input_dev->name = "pmic_onkey";
116 input_dev->phys = "pmic_onkey/input0";
117
118 input_set_capability(input_dev, EV_KEY, KEY_POWER);
119
120 onkey->input_dev = input_dev;
121
122 /* interrupt is nested in a thread */
123 error = devm_request_threaded_irq(dev, onkey->irq_falling, NULL,
124 onkey_falling_irq, IRQF_ONESHOT,
125 dev_name(dev), onkey);
126 if (error) {
127 dev_err(dev, "Can't get IRQ Onkey Falling: %d\n", error);
128 return error;
129 }
130
131 error = devm_request_threaded_irq(dev, onkey->irq_rising, NULL,
132 onkey_rising_irq, IRQF_ONESHOT,
133 dev_name(dev), onkey);
134 if (error) {
135 dev_err(dev, "Can't get IRQ Onkey Rising: %d\n", error);
136 return error;
137 }
138
139 error = input_register_device(input_dev);
140 if (error) {
141 dev_err(dev, "Can't register power button: %d\n", error);
142 return error;
143 }
144
145 platform_set_drvdata(pdev, onkey);
146 device_init_wakeup(dev, true);
147
148 return 0;
149}
150
151static int __maybe_unused stpmic1_onkey_suspend(struct device *dev)
152{
153 struct platform_device *pdev = to_platform_device(dev);
154 struct stpmic1_onkey *onkey = platform_get_drvdata(pdev);
155
156 if (device_may_wakeup(dev)) {
157 enable_irq_wake(onkey->irq_falling);
158 enable_irq_wake(onkey->irq_rising);
159 }
160 return 0;
161}
162
163static int __maybe_unused stpmic1_onkey_resume(struct device *dev)
164{
165 struct platform_device *pdev = to_platform_device(dev);
166 struct stpmic1_onkey *onkey = platform_get_drvdata(pdev);
167
168 if (device_may_wakeup(dev)) {
169 disable_irq_wake(onkey->irq_falling);
170 disable_irq_wake(onkey->irq_rising);
171 }
172 return 0;
173}
174
175static SIMPLE_DEV_PM_OPS(stpmic1_onkey_pm,
176 stpmic1_onkey_suspend,
177 stpmic1_onkey_resume);
178
179static const struct of_device_id of_stpmic1_onkey_match[] = {
180 { .compatible = "st,stpmic1-onkey" },
181 { },
182};
183
184MODULE_DEVICE_TABLE(of, of_stpmic1_onkey_match);
185
186static struct platform_driver stpmic1_onkey_driver = {
187 .probe = stpmic1_onkey_probe,
188 .driver = {
189 .name = "stpmic1_onkey",
190 .of_match_table = of_match_ptr(of_stpmic1_onkey_match),
191 .pm = &stpmic1_onkey_pm,
192 },
193};
194module_platform_driver(stpmic1_onkey_driver);
195
196MODULE_DESCRIPTION("Onkey driver for STPMIC1");
197MODULE_AUTHOR("Pascal Paillet <p.paillet@st.com>");
198MODULE_LICENSE("GPL v2");
199