1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Texas Instruments' TPS65217 and TPS65218 Power Button Input Driver
4  *
5  * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com/
6  * Author: Felipe Balbi <balbi@ti.com>
7  * Author: Marcin Niestroj <m.niestroj@grinn-global.com>
8  */
9 
10 #include <linux/init.h>
11 #include <linux/input.h>
12 #include <linux/interrupt.h>
13 #include <linux/kernel.h>
14 #include <linux/mfd/tps65217.h>
15 #include <linux/mfd/tps65218.h>
16 #include <linux/module.h>
17 #include <linux/of.h>
18 #include <linux/platform_device.h>
19 #include <linux/regmap.h>
20 #include <linux/slab.h>
21 
22 struct tps6521x_data {
23 	unsigned int reg_status;
24 	unsigned int pb_mask;
25 	const char *name;
26 };
27 
28 static const struct tps6521x_data tps65217_data = {
29 	.reg_status = TPS65217_REG_STATUS,
30 	.pb_mask = TPS65217_STATUS_PB,
31 	.name = "tps65217_pwrbutton",
32 };
33 
34 static const struct tps6521x_data tps65218_data = {
35 	.reg_status = TPS65218_REG_STATUS,
36 	.pb_mask = TPS65218_STATUS_PB_STATE,
37 	.name = "tps65218_pwrbutton",
38 };
39 
40 struct tps6521x_pwrbutton {
41 	struct device *dev;
42 	struct regmap *regmap;
43 	struct input_dev *idev;
44 	const struct tps6521x_data *data;
45 	char phys[32];
46 };
47 
48 static const struct of_device_id of_tps6521x_pb_match[] = {
49 	{ .compatible = "ti,tps65217-pwrbutton", .data = &tps65217_data },
50 	{ .compatible = "ti,tps65218-pwrbutton", .data = &tps65218_data },
51 	{ },
52 };
53 MODULE_DEVICE_TABLE(of, of_tps6521x_pb_match);
54 
tps6521x_pb_irq(int irq,void * _pwr)55 static irqreturn_t tps6521x_pb_irq(int irq, void *_pwr)
56 {
57 	struct tps6521x_pwrbutton *pwr = _pwr;
58 	const struct tps6521x_data *tps_data = pwr->data;
59 	unsigned int reg;
60 	int error;
61 
62 	error = regmap_read(pwr->regmap, tps_data->reg_status, &reg);
63 	if (error) {
64 		dev_err(pwr->dev, "can't read register: %d\n", error);
65 		goto out;
66 	}
67 
68 	if (reg & tps_data->pb_mask) {
69 		input_report_key(pwr->idev, KEY_POWER, 1);
70 		pm_wakeup_event(pwr->dev, 0);
71 	} else {
72 		input_report_key(pwr->idev, KEY_POWER, 0);
73 	}
74 
75 	input_sync(pwr->idev);
76 
77 out:
78 	return IRQ_HANDLED;
79 }
80 
tps6521x_pb_probe(struct platform_device * pdev)81 static int tps6521x_pb_probe(struct platform_device *pdev)
82 {
83 	struct device *dev = &pdev->dev;
84 	struct tps6521x_pwrbutton *pwr;
85 	struct input_dev *idev;
86 	const struct of_device_id *match;
87 	int error;
88 	int irq;
89 
90 	match = of_match_node(of_tps6521x_pb_match, dev->of_node);
91 	if (!match)
92 		return -ENXIO;
93 
94 	pwr = devm_kzalloc(dev, sizeof(*pwr), GFP_KERNEL);
95 	if (!pwr)
96 		return -ENOMEM;
97 
98 	pwr->data = match->data;
99 
100 	idev = devm_input_allocate_device(dev);
101 	if (!idev)
102 		return -ENOMEM;
103 
104 	idev->name = pwr->data->name;
105 	snprintf(pwr->phys, sizeof(pwr->phys), "%s/input0",
106 		pwr->data->name);
107 	idev->phys = pwr->phys;
108 	idev->dev.parent = dev;
109 	idev->id.bustype = BUS_I2C;
110 
111 	input_set_capability(idev, EV_KEY, KEY_POWER);
112 
113 	pwr->regmap = dev_get_regmap(dev->parent, NULL);
114 	pwr->dev = dev;
115 	pwr->idev = idev;
116 	device_init_wakeup(dev, true);
117 
118 	irq = platform_get_irq(pdev, 0);
119 	if (irq < 0)
120 		return -EINVAL;
121 
122 	error = devm_request_threaded_irq(dev, irq, NULL, tps6521x_pb_irq,
123 					  IRQF_TRIGGER_RISING |
124 						IRQF_TRIGGER_FALLING |
125 						IRQF_ONESHOT,
126 					  pwr->data->name, pwr);
127 	if (error) {
128 		dev_err(dev, "failed to request IRQ #%d: %d\n", irq, error);
129 		return error;
130 	}
131 
132 	error= input_register_device(idev);
133 	if (error) {
134 		dev_err(dev, "Can't register power button: %d\n", error);
135 		return error;
136 	}
137 
138 	return 0;
139 }
140 
141 static const struct platform_device_id tps6521x_pwrbtn_id_table[] = {
142 	{ "tps65218-pwrbutton", },
143 	{ "tps65217-pwrbutton", },
144 	{ /* sentinel */ }
145 };
146 MODULE_DEVICE_TABLE(platform, tps6521x_pwrbtn_id_table);
147 
148 static struct platform_driver tps6521x_pb_driver = {
149 	.probe	= tps6521x_pb_probe,
150 	.driver	= {
151 		.name	= "tps6521x_pwrbutton",
152 		.of_match_table = of_tps6521x_pb_match,
153 	},
154 	.id_table = tps6521x_pwrbtn_id_table,
155 };
156 module_platform_driver(tps6521x_pb_driver);
157 
158 MODULE_DESCRIPTION("TPS6521X Power Button");
159 MODULE_LICENSE("GPL v2");
160 MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
161