1// SPDX-License-Identifier: GPL-2.0
2//
3// Copyright (C) 2018 BayLibre SAS
4// Author: Bartosz Golaszewski <bgolaszewski@baylibre.com>
5//
6// ONKEY driver for MAXIM 77650/77651 charger/power-supply.
7
8#include <linux/i2c.h>
9#include <linux/input.h>
10#include <linux/interrupt.h>
11#include <linux/mfd/max77650.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/regmap.h>
15
16#define MAX77650_ONKEY_MODE_MASK	BIT(3)
17#define MAX77650_ONKEY_MODE_PUSH	0x00
18#define MAX77650_ONKEY_MODE_SLIDE	BIT(3)
19
20struct max77650_onkey {
21	struct input_dev *input;
22	unsigned int code;
23};
24
25static irqreturn_t max77650_onkey_falling(int irq, void *data)
26{
27	struct max77650_onkey *onkey = data;
28
29	input_report_key(onkey->input, onkey->code, 0);
30	input_sync(onkey->input);
31
32	return IRQ_HANDLED;
33}
34
35static irqreturn_t max77650_onkey_rising(int irq, void *data)
36{
37	struct max77650_onkey *onkey = data;
38
39	input_report_key(onkey->input, onkey->code, 1);
40	input_sync(onkey->input);
41
42	return IRQ_HANDLED;
43}
44
45static int max77650_onkey_probe(struct platform_device *pdev)
46{
47	int irq_r, irq_f, error, mode;
48	struct max77650_onkey *onkey;
49	struct device *dev, *parent;
50	struct regmap *map;
51	unsigned int type;
52
53	dev = &pdev->dev;
54	parent = dev->parent;
55
56	map = dev_get_regmap(parent, NULL);
57	if (!map)
58		return -ENODEV;
59
60	onkey = devm_kzalloc(dev, sizeof(*onkey), GFP_KERNEL);
61	if (!onkey)
62		return -ENOMEM;
63
64	error = device_property_read_u32(dev, "linux,code", &onkey->code);
65	if (error)
66		onkey->code = KEY_POWER;
67
68	if (device_property_read_bool(dev, "maxim,onkey-slide")) {
69		mode = MAX77650_ONKEY_MODE_SLIDE;
70		type = EV_SW;
71	} else {
72		mode = MAX77650_ONKEY_MODE_PUSH;
73		type = EV_KEY;
74	}
75
76	error = regmap_update_bits(map, MAX77650_REG_CNFG_GLBL,
77				   MAX77650_ONKEY_MODE_MASK, mode);
78	if (error)
79		return error;
80
81	irq_f = platform_get_irq_byname(pdev, "nEN_F");
82	if (irq_f < 0)
83		return irq_f;
84
85	irq_r = platform_get_irq_byname(pdev, "nEN_R");
86	if (irq_r < 0)
87		return irq_r;
88
89	onkey->input = devm_input_allocate_device(dev);
90	if (!onkey->input)
91		return -ENOMEM;
92
93	onkey->input->name = "max77650_onkey";
94	onkey->input->phys = "max77650_onkey/input0";
95	onkey->input->id.bustype = BUS_I2C;
96	input_set_capability(onkey->input, type, onkey->code);
97
98	error = devm_request_any_context_irq(dev, irq_f, max77650_onkey_falling,
99					     IRQF_ONESHOT, "onkey-down", onkey);
100	if (error < 0)
101		return error;
102
103	error = devm_request_any_context_irq(dev, irq_r, max77650_onkey_rising,
104					     IRQF_ONESHOT, "onkey-up", onkey);
105	if (error < 0)
106		return error;
107
108	return input_register_device(onkey->input);
109}
110
111static const struct of_device_id max77650_onkey_of_match[] = {
112	{ .compatible = "maxim,max77650-onkey" },
113	{ }
114};
115MODULE_DEVICE_TABLE(of, max77650_onkey_of_match);
116
117static struct platform_driver max77650_onkey_driver = {
118	.driver = {
119		.name = "max77650-onkey",
120		.of_match_table = max77650_onkey_of_match,
121	},
122	.probe = max77650_onkey_probe,
123};
124module_platform_driver(max77650_onkey_driver);
125
126MODULE_DESCRIPTION("MAXIM 77650/77651 ONKEY driver");
127MODULE_AUTHOR("Bartosz Golaszewski <bgolaszewski@baylibre.com>");
128MODULE_LICENSE("GPL v2");
129MODULE_ALIAS("platform:max77650-onkey");
130