1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Power-button driver for Basin Cove PMIC
4 *
5 * Copyright (c) 2019, Intel Corporation.
6 * Author: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
7 */
8
9#include <linux/input.h>
10#include <linux/interrupt.h>
11#include <linux/device.h>
12#include <linux/mfd/intel_soc_pmic.h>
13#include <linux/mfd/intel_soc_pmic_mrfld.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16#include <linux/pm_wakeirq.h>
17#include <linux/slab.h>
18
19#define BCOVE_PBSTATUS		0x27
20#define BCOVE_PBSTATUS_PBLVL	BIT(4)	/* 1 - release, 0 - press */
21
22static irqreturn_t mrfld_pwrbtn_interrupt(int irq, void *dev_id)
23{
24	struct input_dev *input = dev_id;
25	struct device *dev = input->dev.parent;
26	struct regmap *regmap = dev_get_drvdata(dev);
27	unsigned int state;
28	int ret;
29
30	ret = regmap_read(regmap, BCOVE_PBSTATUS, &state);
31	if (ret)
32		return IRQ_NONE;
33
34	dev_dbg(dev, "PBSTATUS=0x%x\n", state);
35	input_report_key(input, KEY_POWER, !(state & BCOVE_PBSTATUS_PBLVL));
36	input_sync(input);
37
38	regmap_update_bits(regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0);
39	return IRQ_HANDLED;
40}
41
42static int mrfld_pwrbtn_probe(struct platform_device *pdev)
43{
44	struct device *dev = &pdev->dev;
45	struct intel_soc_pmic *pmic = dev_get_drvdata(dev->parent);
46	struct input_dev *input;
47	int irq, ret;
48
49	irq = platform_get_irq(pdev, 0);
50	if (irq < 0)
51		return irq;
52
53	input = devm_input_allocate_device(dev);
54	if (!input)
55		return -ENOMEM;
56	input->name = pdev->name;
57	input->phys = "power-button/input0";
58	input->id.bustype = BUS_HOST;
59	input->dev.parent = dev;
60	input_set_capability(input, EV_KEY, KEY_POWER);
61	ret = input_register_device(input);
62	if (ret)
63		return ret;
64
65	dev_set_drvdata(dev, pmic->regmap);
66
67	ret = devm_request_threaded_irq(dev, irq, NULL, mrfld_pwrbtn_interrupt,
68					IRQF_ONESHOT | IRQF_SHARED, pdev->name,
69					input);
70	if (ret)
71		return ret;
72
73	regmap_update_bits(pmic->regmap, BCOVE_MIRQLVL1, BCOVE_LVL1_PWRBTN, 0);
74	regmap_update_bits(pmic->regmap, BCOVE_MPBIRQ, BCOVE_PBIRQ_PBTN, 0);
75
76	device_init_wakeup(dev, true);
77	dev_pm_set_wake_irq(dev, irq);
78	return 0;
79}
80
81static void mrfld_pwrbtn_remove(struct platform_device *pdev)
82{
83	struct device *dev = &pdev->dev;
84
85	dev_pm_clear_wake_irq(dev);
86	device_init_wakeup(dev, false);
87}
88
89static const struct platform_device_id mrfld_pwrbtn_id_table[] = {
90	{ .name = "mrfld_bcove_pwrbtn" },
91	{}
92};
93MODULE_DEVICE_TABLE(platform, mrfld_pwrbtn_id_table);
94
95static struct platform_driver mrfld_pwrbtn_driver = {
96	.driver = {
97		.name	= "mrfld_bcove_pwrbtn",
98	},
99	.probe		= mrfld_pwrbtn_probe,
100	.remove_new	= mrfld_pwrbtn_remove,
101	.id_table	= mrfld_pwrbtn_id_table,
102};
103module_platform_driver(mrfld_pwrbtn_driver);
104
105MODULE_DESCRIPTION("Power-button driver for Basin Cove PMIC");
106MODULE_LICENSE("GPL v2");
107