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
22struct tps6521x_data {
23 unsigned int reg_status;
24 unsigned int pb_mask;
25 const char *name;
26};
27
28static const struct tps6521x_data tps65217_data = {
29 .reg_status = TPS65217_REG_STATUS,
30 .pb_mask = TPS65217_STATUS_PB,
31 .name = "tps65217_pwrbutton",
32};
33
34static 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
40struct 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
48static 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};
53MODULE_DEVICE_TABLE(of, of_tps6521x_pb_match);
54
55static 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(map: pwr->regmap, reg: tps_data->reg_status, val: &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(dev: pwr->idev, KEY_POWER, value: 1);
70 pm_wakeup_event(dev: pwr->dev, msec: 0);
71 } else {
72 input_report_key(dev: pwr->idev, KEY_POWER, value: 0);
73 }
74
75 input_sync(dev: pwr->idev);
76
77out:
78 return IRQ_HANDLED;
79}
80
81static 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(matches: of_tps6521x_pb_match, node: dev->of_node);
91 if (!match)
92 return -ENXIO;
93
94 pwr = devm_kzalloc(dev, size: 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(buf: pwr->phys, size: sizeof(pwr->phys), fmt: "%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(dev: idev, EV_KEY, KEY_POWER);
112
113 pwr->regmap = dev_get_regmap(dev: dev->parent, NULL);
114 pwr->dev = dev;
115 pwr->idev = idev;
116 device_init_wakeup(dev, enable: 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, thread_fn: tps6521x_pb_irq,
123 IRQF_TRIGGER_RISING |
124 IRQF_TRIGGER_FALLING |
125 IRQF_ONESHOT,
126 devname: pwr->data->name, dev_id: 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
141static const struct platform_device_id tps6521x_pwrbtn_id_table[] = {
142 { "tps65218-pwrbutton", },
143 { "tps65217-pwrbutton", },
144 { /* sentinel */ }
145};
146MODULE_DEVICE_TABLE(platform, tps6521x_pwrbtn_id_table);
147
148static 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};
156module_platform_driver(tps6521x_pb_driver);
157
158MODULE_DESCRIPTION("TPS6521X Power Button");
159MODULE_LICENSE("GPL v2");
160MODULE_AUTHOR("Felipe Balbi <balbi@ti.com>");
161

source code of linux/drivers/input/misc/tps65218-pwrbutton.c