1// SPDX-License-Identifier: GPL-2.0-only
  2/*
  3 * Marvell 88PM80x ONKEY driver
  4 *
  5 * Copyright (C) 2012 Marvell International Ltd.
  6 * Haojian Zhuang <haojian.zhuang@marvell.com>
  7 * Qiao Zhou <zhouqiao@marvell.com>
  8 */
  9
 10#include <linux/kernel.h>
 11#include <linux/module.h>
 12#include <linux/input.h>
 13#include <linux/mfd/88pm80x.h>
 14#include <linux/regmap.h>
 15#include <linux/slab.h>
 16
 17#define PM800_LONG_ONKEY_EN		(1 << 0)
 18#define PM800_LONG_KEY_DELAY		(8)	/* 1 .. 16 seconds */
 19#define PM800_LONKEY_PRESS_TIME		((PM800_LONG_KEY_DELAY-1) << 4)
 20#define PM800_LONKEY_PRESS_TIME_MASK	(0xF0)
 21#define PM800_SW_PDOWN			(1 << 5)
 22
 23struct pm80x_onkey_info {
 24	struct input_dev *idev;
 25	struct pm80x_chip *pm80x;
 26	struct regmap *map;
 27	int irq;
 28};
 29
 30/* 88PM80x gives us an interrupt when ONKEY is held */
 31static irqreturn_t pm80x_onkey_handler(int irq, void *data)
 32{
 33	struct pm80x_onkey_info *info = data;
 34	int ret = 0;
 35	unsigned int val;
 36
 37	ret = regmap_read(info->map, PM800_STATUS_1, &val);
 38	if (ret < 0) {
 39		dev_err(info->idev->dev.parent, "failed to read status: %d\n", ret);
 40		return IRQ_NONE;
 41	}
 42	val &= PM800_ONKEY_STS1;
 43
 44	input_report_key(info->idev, KEY_POWER, val);
 45	input_sync(info->idev);
 46
 47	return IRQ_HANDLED;
 48}
 49
 50static SIMPLE_DEV_PM_OPS(pm80x_onkey_pm_ops, pm80x_dev_suspend,
 51			 pm80x_dev_resume);
 52
 53static int pm80x_onkey_probe(struct platform_device *pdev)
 54{
 55
 56	struct pm80x_chip *chip = dev_get_drvdata(pdev->dev.parent);
 57	struct pm80x_onkey_info *info;
 58	int err;
 59
 60	info = kzalloc(sizeof(*info), GFP_KERNEL);
 61	if (!info)
 62		return -ENOMEM;
 63
 64	info->pm80x = chip;
 65
 66	info->irq = platform_get_irq(pdev, 0);
 67	if (info->irq < 0) {
 68		err = -EINVAL;
 69		goto out;
 70	}
 71
 72	info->map = info->pm80x->regmap;
 73	if (!info->map) {
 74		dev_err(&pdev->dev, "no regmap!\n");
 75		err = -EINVAL;
 76		goto out;
 77	}
 78
 79	info->idev = input_allocate_device();
 80	if (!info->idev) {
 81		dev_err(&pdev->dev, "Failed to allocate input dev\n");
 82		err = -ENOMEM;
 83		goto out;
 84	}
 85
 86	info->idev->name = "88pm80x_on";
 87	info->idev->phys = "88pm80x_on/input0";
 88	info->idev->id.bustype = BUS_I2C;
 89	info->idev->dev.parent = &pdev->dev;
 90	info->idev->evbit[0] = BIT_MASK(EV_KEY);
 91	__set_bit(KEY_POWER, info->idev->keybit);
 92
 93	err = pm80x_request_irq(info->pm80x, info->irq, pm80x_onkey_handler,
 94					    IRQF_ONESHOT, "onkey", info);
 95	if (err < 0) {
 96		dev_err(&pdev->dev, "Failed to request IRQ: #%d: %d\n",
 97			info->irq, err);
 98		goto out_reg;
 99	}
100
101	err = input_register_device(info->idev);
102	if (err) {
103		dev_err(&pdev->dev, "Can't register input device: %d\n", err);
104		goto out_irq;
105	}
106
107	platform_set_drvdata(pdev, info);
108
109	/* Enable long onkey detection */
110	regmap_update_bits(info->map, PM800_RTC_MISC4, PM800_LONG_ONKEY_EN,
111			   PM800_LONG_ONKEY_EN);
112	/* Set 8-second interval */
113	regmap_update_bits(info->map, PM800_RTC_MISC3,
114			   PM800_LONKEY_PRESS_TIME_MASK,
115			   PM800_LONKEY_PRESS_TIME);
116
117	device_init_wakeup(&pdev->dev, 1);
118	return 0;
119
120out_irq:
121	pm80x_free_irq(info->pm80x, info->irq, info);
122out_reg:
123	input_free_device(info->idev);
124out:
125	kfree(info);
126	return err;
127}
128
129static void pm80x_onkey_remove(struct platform_device *pdev)
130{
131	struct pm80x_onkey_info *info = platform_get_drvdata(pdev);
132
133	pm80x_free_irq(info->pm80x, info->irq, info);
134	input_unregister_device(info->idev);
135	kfree(info);
136}
137
138static struct platform_driver pm80x_onkey_driver = {
139	.driver = {
140		   .name = "88pm80x-onkey",
141		   .pm = &pm80x_onkey_pm_ops,
142		   },
143	.probe = pm80x_onkey_probe,
144	.remove = pm80x_onkey_remove,
145};
146
147module_platform_driver(pm80x_onkey_driver);
148
149MODULE_LICENSE("GPL");
150MODULE_DESCRIPTION("Marvell 88PM80x ONKEY driver");
151MODULE_AUTHOR("Qiao Zhou <zhouqiao@marvell.com>");
152MODULE_ALIAS("platform:88pm80x-onkey");