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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pcap_keys.c (2994B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 *  Input driver for PCAP events:
      4 *   * Power key
      5 *   * Headphone button
      6 *
      7 *  Copyright (c) 2008,2009 Ilya Petrov <ilya.muromec@gmail.com>
      8 */
      9
     10#include <linux/module.h>
     11#include <linux/interrupt.h>
     12#include <linux/platform_device.h>
     13#include <linux/input.h>
     14#include <linux/mfd/ezx-pcap.h>
     15#include <linux/slab.h>
     16
     17struct pcap_keys {
     18	struct pcap_chip *pcap;
     19	struct input_dev *input;
     20};
     21
     22/* PCAP2 interrupts us on keypress */
     23static irqreturn_t pcap_keys_handler(int irq, void *_pcap_keys)
     24{
     25	struct pcap_keys *pcap_keys = _pcap_keys;
     26	int pirq = irq_to_pcap(pcap_keys->pcap, irq);
     27	u32 pstat;
     28
     29	ezx_pcap_read(pcap_keys->pcap, PCAP_REG_PSTAT, &pstat);
     30	pstat &= 1 << pirq;
     31
     32	switch (pirq) {
     33	case PCAP_IRQ_ONOFF:
     34		input_report_key(pcap_keys->input, KEY_POWER, !pstat);
     35		break;
     36	case PCAP_IRQ_MIC:
     37		input_report_key(pcap_keys->input, KEY_HP, !pstat);
     38		break;
     39	}
     40
     41	input_sync(pcap_keys->input);
     42
     43	return IRQ_HANDLED;
     44}
     45
     46static int pcap_keys_probe(struct platform_device *pdev)
     47{
     48	int err = -ENOMEM;
     49	struct pcap_keys *pcap_keys;
     50	struct input_dev *input_dev;
     51
     52	pcap_keys = kmalloc(sizeof(struct pcap_keys), GFP_KERNEL);
     53	if (!pcap_keys)
     54		return err;
     55
     56	pcap_keys->pcap = dev_get_drvdata(pdev->dev.parent);
     57
     58	input_dev = input_allocate_device();
     59	if (!input_dev)
     60		goto fail;
     61
     62	pcap_keys->input = input_dev;
     63
     64	platform_set_drvdata(pdev, pcap_keys);
     65	input_dev->name = pdev->name;
     66	input_dev->phys = "pcap-keys/input0";
     67	input_dev->id.bustype = BUS_HOST;
     68	input_dev->dev.parent = &pdev->dev;
     69
     70	__set_bit(EV_KEY, input_dev->evbit);
     71	__set_bit(KEY_POWER, input_dev->keybit);
     72	__set_bit(KEY_HP, input_dev->keybit);
     73
     74	err = input_register_device(input_dev);
     75	if (err)
     76		goto fail_allocate;
     77
     78	err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF),
     79			pcap_keys_handler, 0, "Power key", pcap_keys);
     80	if (err)
     81		goto fail_register;
     82
     83	err = request_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC),
     84			pcap_keys_handler, 0, "Headphone button", pcap_keys);
     85	if (err)
     86		goto fail_pwrkey;
     87
     88	return 0;
     89
     90fail_pwrkey:
     91	free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys);
     92fail_register:
     93	input_unregister_device(input_dev);
     94	goto fail;
     95fail_allocate:
     96	input_free_device(input_dev);
     97fail:
     98	kfree(pcap_keys);
     99	return err;
    100}
    101
    102static int pcap_keys_remove(struct platform_device *pdev)
    103{
    104	struct pcap_keys *pcap_keys = platform_get_drvdata(pdev);
    105
    106	free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_ONOFF), pcap_keys);
    107	free_irq(pcap_to_irq(pcap_keys->pcap, PCAP_IRQ_MIC), pcap_keys);
    108
    109	input_unregister_device(pcap_keys->input);
    110	kfree(pcap_keys);
    111
    112	return 0;
    113}
    114
    115static struct platform_driver pcap_keys_device_driver = {
    116	.probe		= pcap_keys_probe,
    117	.remove		= pcap_keys_remove,
    118	.driver		= {
    119		.name	= "pcap-keys",
    120	}
    121};
    122module_platform_driver(pcap_keys_device_driver);
    123
    124MODULE_DESCRIPTION("Motorola PCAP2 input events driver");
    125MODULE_AUTHOR("Ilya Petrov <ilya.muromec@gmail.com>");
    126MODULE_LICENSE("GPL");
    127MODULE_ALIAS("platform:pcap_keys");