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");