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