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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hisi_powerkey.c (3239B)

      1/*
      2 * Hisilicon PMIC powerkey driver
      3 *
      4 * Copyright (C) 2013 Hisilicon Ltd.
      5 * Copyright (C) 2015, 2016 Linaro Ltd.
      6 *
      7 * This file is subject to the terms and conditions of the GNU General
      8 * Public License. See the file "COPYING" in the main directory of this
      9 * archive for more details.
     10 *
     11 * This program is distributed in the hope that it will be useful,
     12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
     13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     14 * GNU General Public License for more details.
     15 */
     16
     17#include <linux/platform_device.h>
     18#include <linux/interrupt.h>
     19#include <linux/reboot.h>
     20#include <linux/kernel.h>
     21#include <linux/module.h>
     22#include <linux/of_irq.h>
     23#include <linux/input.h>
     24#include <linux/slab.h>
     25
     26/* the held interrupt will trigger after 4 seconds */
     27#define MAX_HELD_TIME	(4 * MSEC_PER_SEC)
     28
     29static irqreturn_t hi65xx_power_press_isr(int irq, void *q)
     30{
     31	struct input_dev *input = q;
     32
     33	pm_wakeup_event(input->dev.parent, MAX_HELD_TIME);
     34	input_report_key(input, KEY_POWER, 1);
     35	input_sync(input);
     36
     37	return IRQ_HANDLED;
     38}
     39
     40static irqreturn_t hi65xx_power_release_isr(int irq, void *q)
     41{
     42	struct input_dev *input = q;
     43
     44	pm_wakeup_event(input->dev.parent, MAX_HELD_TIME);
     45	input_report_key(input, KEY_POWER, 0);
     46	input_sync(input);
     47
     48	return IRQ_HANDLED;
     49}
     50
     51static irqreturn_t hi65xx_restart_toggle_isr(int irq, void *q)
     52{
     53	struct input_dev *input = q;
     54	int value = test_bit(KEY_RESTART, input->key);
     55
     56	pm_wakeup_event(input->dev.parent, MAX_HELD_TIME);
     57	input_report_key(input, KEY_RESTART, !value);
     58	input_sync(input);
     59
     60	return IRQ_HANDLED;
     61}
     62
     63static const struct {
     64	const char *name;
     65	irqreturn_t (*handler)(int irq, void *q);
     66} hi65xx_irq_info[] = {
     67	{ "down", hi65xx_power_press_isr },
     68	{ "up", hi65xx_power_release_isr },
     69	{ "hold 4s", hi65xx_restart_toggle_isr },
     70};
     71
     72static int hi65xx_powerkey_probe(struct platform_device *pdev)
     73{
     74	struct device *dev = &pdev->dev;
     75	struct input_dev *input;
     76	int irq, i, error;
     77
     78	input = devm_input_allocate_device(dev);
     79	if (!input) {
     80		dev_err(dev, "failed to allocate input device\n");
     81		return -ENOMEM;
     82	}
     83
     84	input->phys = "hisi_on/input0";
     85	input->name = "HISI 65xx PowerOn Key";
     86
     87	input_set_capability(input, EV_KEY, KEY_POWER);
     88	input_set_capability(input, EV_KEY, KEY_RESTART);
     89
     90	for (i = 0; i < ARRAY_SIZE(hi65xx_irq_info); i++) {
     91
     92		irq = platform_get_irq_byname(pdev, hi65xx_irq_info[i].name);
     93		if (irq < 0)
     94			return irq;
     95
     96		error = devm_request_any_context_irq(dev, irq,
     97						     hi65xx_irq_info[i].handler,
     98						     IRQF_ONESHOT,
     99						     hi65xx_irq_info[i].name,
    100						     input);
    101		if (error < 0) {
    102			dev_err(dev, "couldn't request irq %s: %d\n",
    103				hi65xx_irq_info[i].name, error);
    104			return error;
    105		}
    106	}
    107
    108	error = input_register_device(input);
    109	if (error) {
    110		dev_err(dev, "failed to register input device: %d\n", error);
    111		return error;
    112	}
    113
    114	device_init_wakeup(dev, 1);
    115
    116	return 0;
    117}
    118
    119static struct platform_driver hi65xx_powerkey_driver = {
    120	.driver = {
    121		.name = "hi65xx-powerkey",
    122	},
    123	.probe = hi65xx_powerkey_probe,
    124};
    125module_platform_driver(hi65xx_powerkey_driver);
    126
    127MODULE_AUTHOR("Zhiliang Xue <xuezhiliang@huawei.com");
    128MODULE_DESCRIPTION("Hisi PMIC Power key driver");
    129MODULE_LICENSE("GPL v2");