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 */
20 struct stpmic1_onkey {
21 struct input_dev *input_dev;
22 int irq_falling;
23 int irq_rising;
24 };
25
onkey_falling_irq(int irq,void * ponkey)26 static 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
onkey_rising_irq(int irq,void * ponkey)38 static 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
stpmic1_onkey_probe(struct platform_device * pdev)50 static 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
stpmic1_onkey_suspend(struct device * dev)145 static 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
stpmic1_onkey_resume(struct device * dev)157 static 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
169 static DEFINE_SIMPLE_DEV_PM_OPS(stpmic1_onkey_pm,
170 stpmic1_onkey_suspend,
171 stpmic1_onkey_resume);
172
173 static const struct of_device_id of_stpmic1_onkey_match[] = {
174 { .compatible = "st,stpmic1-onkey" },
175 { },
176 };
177
178 MODULE_DEVICE_TABLE(of, of_stpmic1_onkey_match);
179
180 static 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 };
188 module_platform_driver(stpmic1_onkey_driver);
189
190 MODULE_DESCRIPTION("Onkey driver for STPMIC1");
191 MODULE_AUTHOR("Pascal Paillet <p.paillet@st.com>");
192 MODULE_LICENSE("GPL v2");
193