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 
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 
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