1// SPDX-License-Identifier: GPL-2.0
 2/*
 3 * Power-button driver for Dollar Cove TI PMIC
 4 * Copyright (C) 2014 Intel Corp
 5 * Copyright (c) 2017 Takashi Iwai <tiwai@suse.de>
 6 */
 7
 8#include <linux/input.h>
 9#include <linux/interrupt.h>
10#include <linux/device.h>
11#include <linux/mfd/intel_soc_pmic.h>
12#include <linux/module.h>
13#include <linux/platform_device.h>
14#include <linux/pm_wakeirq.h>
15#include <linux/slab.h>
16
17#define CHTDC_TI_SIRQ_REG	0x3
18#define SIRQ_PWRBTN_REL		BIT(0)
19
20static irqreturn_t chtdc_ti_pwrbtn_interrupt(int irq, void *dev_id)
21{
22	struct input_dev *input = dev_id;
23	struct device *dev = input->dev.parent;
24	struct regmap *regmap = dev_get_drvdata(dev);
25	int state;
26
27	if (!regmap_read(regmap, CHTDC_TI_SIRQ_REG, &state)) {
28		dev_dbg(dev, "SIRQ_REG=0x%x\n", state);
29		input_report_key(input, KEY_POWER, !(state & SIRQ_PWRBTN_REL));
30		input_sync(input);
31	}
32
33	return IRQ_HANDLED;
34}
35
36static int chtdc_ti_pwrbtn_probe(struct platform_device *pdev)
37{
38	struct device *dev = &pdev->dev;
39	struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
40	struct input_dev *input;
41	int irq, err;
42
43	irq = platform_get_irq(pdev, 0);
44	if (irq < 0)
45		return irq;
46	input = devm_input_allocate_device(dev);
47	if (!input)
48		return -ENOMEM;
49	input->name = pdev->name;
50	input->phys = "power-button/input0";
51	input->id.bustype = BUS_HOST;
52	input_set_capability(input, EV_KEY, KEY_POWER);
53	err = input_register_device(input);
54	if (err)
55		return err;
56
57	dev_set_drvdata(dev, pmic->regmap);
58
59	err = devm_request_threaded_irq(dev, irq, NULL,
60					chtdc_ti_pwrbtn_interrupt,
61					IRQF_ONESHOT, KBUILD_MODNAME, input);
62	if (err)
63		return err;
64
65	device_init_wakeup(dev, true);
66	dev_pm_set_wake_irq(dev, irq);
67	return 0;
68}
69
70static int chtdc_ti_pwrbtn_remove(struct platform_device *pdev)
71{
72	dev_pm_clear_wake_irq(&pdev->dev);
73	device_init_wakeup(&pdev->dev, false);
74	return 0;
75}
76
77static const struct platform_device_id chtdc_ti_pwrbtn_id_table[] = {
78	{ .name = "chtdc_ti_pwrbtn" },
79	{},
80};
81MODULE_DEVICE_TABLE(platform, chtdc_ti_pwrbtn_id_table);
82
83static struct platform_driver chtdc_ti_pwrbtn_driver = {
84	.driver = {
85		.name	= KBUILD_MODNAME,
86	},
87	.probe		= chtdc_ti_pwrbtn_probe,
88	.remove		= chtdc_ti_pwrbtn_remove,
89	.id_table	= chtdc_ti_pwrbtn_id_table,
90};
91module_platform_driver(chtdc_ti_pwrbtn_driver);
92
93MODULE_DESCRIPTION("Power-button driver for Dollar Cove TI PMIC");
94MODULE_LICENSE("GPL v2");