1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2022 Richtek Technology Corp.
4 * Author: ChiYuan Huang <cy_huang@richtek.com>
5 */
6
7 #include <linux/bits.h>
8 #include <linux/input.h>
9 #include <linux/interrupt.h>
10 #include <linux/kernel.h>
11 #include <linux/module.h>
12 #include <linux/mod_devicetable.h>
13 #include <linux/platform_device.h>
14 #include <linux/regmap.h>
15
16 #define RT5120_REG_INTSTAT 0x1E
17 #define RT5120_PWRKEYSTAT_MASK BIT(7)
18
19 struct rt5120_priv {
20 struct regmap *regmap;
21 struct input_dev *input;
22 };
23
rt5120_pwrkey_handler(int irq,void * devid)24 static irqreturn_t rt5120_pwrkey_handler(int irq, void *devid)
25 {
26 struct rt5120_priv *priv = devid;
27 unsigned int stat;
28 int error;
29
30 error = regmap_read(priv->regmap, RT5120_REG_INTSTAT, &stat);
31 if (error)
32 return IRQ_NONE;
33
34 input_report_key(priv->input, KEY_POWER,
35 !(stat & RT5120_PWRKEYSTAT_MASK));
36 input_sync(priv->input);
37
38 return IRQ_HANDLED;
39 }
40
rt5120_pwrkey_probe(struct platform_device * pdev)41 static int rt5120_pwrkey_probe(struct platform_device *pdev)
42 {
43 struct rt5120_priv *priv;
44 struct device *dev = &pdev->dev;
45 int press_irq, release_irq;
46 int error;
47
48 priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
49 if (!priv)
50 return -ENOMEM;
51
52 priv->regmap = dev_get_regmap(dev->parent, NULL);
53 if (!priv->regmap) {
54 dev_err(dev, "Failed to init regmap\n");
55 return -ENODEV;
56 }
57
58 press_irq = platform_get_irq_byname(pdev, "pwrkey-press");
59 if (press_irq < 0)
60 return press_irq;
61
62 release_irq = platform_get_irq_byname(pdev, "pwrkey-release");
63 if (release_irq < 0)
64 return release_irq;
65
66 /* Make input device be device resource managed */
67 priv->input = devm_input_allocate_device(dev);
68 if (!priv->input)
69 return -ENOMEM;
70
71 priv->input->name = "rt5120_pwrkey";
72 priv->input->phys = "rt5120_pwrkey/input0";
73 priv->input->id.bustype = BUS_I2C;
74 input_set_capability(priv->input, EV_KEY, KEY_POWER);
75
76 error = input_register_device(priv->input);
77 if (error) {
78 dev_err(dev, "Failed to register input device: %d\n", error);
79 return error;
80 }
81
82 error = devm_request_threaded_irq(dev, press_irq,
83 NULL, rt5120_pwrkey_handler,
84 0, "pwrkey-press", priv);
85 if (error) {
86 dev_err(dev,
87 "Failed to register pwrkey press irq: %d\n", error);
88 return error;
89 }
90
91 error = devm_request_threaded_irq(dev, release_irq,
92 NULL, rt5120_pwrkey_handler,
93 0, "pwrkey-release", priv);
94 if (error) {
95 dev_err(dev,
96 "Failed to register pwrkey release irq: %d\n", error);
97 return error;
98 }
99
100 return 0;
101 }
102
103 static const struct of_device_id r5120_pwrkey_match_table[] = {
104 { .compatible = "richtek,rt5120-pwrkey" },
105 {}
106 };
107 MODULE_DEVICE_TABLE(of, r5120_pwrkey_match_table);
108
109 static struct platform_driver rt5120_pwrkey_driver = {
110 .driver = {
111 .name = "rt5120-pwrkey",
112 .of_match_table = r5120_pwrkey_match_table,
113 },
114 .probe = rt5120_pwrkey_probe,
115 };
116 module_platform_driver(rt5120_pwrkey_driver);
117
118 MODULE_AUTHOR("ChiYuan Huang <cy_huang@richtek.com>");
119 MODULE_DESCRIPTION("Richtek RT5120 power key driver");
120 MODULE_LICENSE("GPL");
121