cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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ab8500-ponkey.c (3254B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 * Copyright (C) ST-Ericsson SA 2010
      4 *
      5 * Author: Sundar Iyer <sundar.iyer@stericsson.com> for ST-Ericsson
      6 *
      7 * AB8500 Power-On Key handler
      8 */
      9
     10#include <linux/device.h>
     11#include <linux/kernel.h>
     12#include <linux/module.h>
     13#include <linux/platform_device.h>
     14#include <linux/input.h>
     15#include <linux/interrupt.h>
     16#include <linux/mfd/abx500/ab8500.h>
     17#include <linux/of.h>
     18#include <linux/slab.h>
     19
     20/**
     21 * struct ab8500_ponkey - ab8500 ponkey information
     22 * @idev: pointer to input device
     23 * @ab8500: ab8500 parent
     24 * @irq_dbf: irq number for falling transition
     25 * @irq_dbr: irq number for rising transition
     26 */
     27struct ab8500_ponkey {
     28	struct input_dev	*idev;
     29	struct ab8500		*ab8500;
     30	int			irq_dbf;
     31	int			irq_dbr;
     32};
     33
     34/* AB8500 gives us an interrupt when ONKEY is held */
     35static irqreturn_t ab8500_ponkey_handler(int irq, void *data)
     36{
     37	struct ab8500_ponkey *ponkey = data;
     38
     39	if (irq == ponkey->irq_dbf)
     40		input_report_key(ponkey->idev, KEY_POWER, true);
     41	else if (irq == ponkey->irq_dbr)
     42		input_report_key(ponkey->idev, KEY_POWER, false);
     43
     44	input_sync(ponkey->idev);
     45
     46	return IRQ_HANDLED;
     47}
     48
     49static int ab8500_ponkey_probe(struct platform_device *pdev)
     50{
     51	struct ab8500 *ab8500 = dev_get_drvdata(pdev->dev.parent);
     52	struct ab8500_ponkey *ponkey;
     53	struct input_dev *input;
     54	int irq_dbf, irq_dbr;
     55	int error;
     56
     57	irq_dbf = platform_get_irq_byname(pdev, "ONKEY_DBF");
     58	if (irq_dbf < 0)
     59		return irq_dbf;
     60
     61	irq_dbr = platform_get_irq_byname(pdev, "ONKEY_DBR");
     62	if (irq_dbr < 0)
     63		return irq_dbr;
     64
     65	ponkey = devm_kzalloc(&pdev->dev, sizeof(struct ab8500_ponkey),
     66			      GFP_KERNEL);
     67	if (!ponkey)
     68		return -ENOMEM;
     69
     70	input = devm_input_allocate_device(&pdev->dev);
     71	if (!input)
     72		return -ENOMEM;
     73
     74	ponkey->idev = input;
     75	ponkey->ab8500 = ab8500;
     76	ponkey->irq_dbf = irq_dbf;
     77	ponkey->irq_dbr = irq_dbr;
     78
     79	input->name = "AB8500 POn(PowerOn) Key";
     80	input->dev.parent = &pdev->dev;
     81
     82	input_set_capability(input, EV_KEY, KEY_POWER);
     83
     84	error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbf,
     85					     ab8500_ponkey_handler, 0,
     86					     "ab8500-ponkey-dbf", ponkey);
     87	if (error < 0) {
     88		dev_err(ab8500->dev, "Failed to request dbf IRQ#%d: %d\n",
     89			ponkey->irq_dbf, error);
     90		return error;
     91	}
     92
     93	error = devm_request_any_context_irq(&pdev->dev, ponkey->irq_dbr,
     94					     ab8500_ponkey_handler, 0,
     95					     "ab8500-ponkey-dbr", ponkey);
     96	if (error < 0) {
     97		dev_err(ab8500->dev, "Failed to request dbr IRQ#%d: %d\n",
     98			ponkey->irq_dbr, error);
     99		return error;
    100	}
    101
    102	error = input_register_device(ponkey->idev);
    103	if (error) {
    104		dev_err(ab8500->dev, "Can't register input device: %d\n", error);
    105		return error;
    106	}
    107
    108	return 0;
    109}
    110
    111#ifdef CONFIG_OF
    112static const struct of_device_id ab8500_ponkey_match[] = {
    113	{ .compatible = "stericsson,ab8500-ponkey", },
    114	{}
    115};
    116MODULE_DEVICE_TABLE(of, ab8500_ponkey_match);
    117#endif
    118
    119static struct platform_driver ab8500_ponkey_driver = {
    120	.driver		= {
    121		.name	= "ab8500-poweron-key",
    122		.of_match_table = of_match_ptr(ab8500_ponkey_match),
    123	},
    124	.probe		= ab8500_ponkey_probe,
    125};
    126module_platform_driver(ab8500_ponkey_driver);
    127
    128MODULE_LICENSE("GPL v2");
    129MODULE_AUTHOR("Sundar Iyer <sundar.iyer@stericsson.com>");
    130MODULE_DESCRIPTION("ST-Ericsson AB8500 Power-ON(Pon) Key driver");