cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
Log | Files | Refs | README | LICENSE | sfeed.txt

apm-power.c (2475B)

      1// SPDX-License-Identifier: GPL-2.0-only
      2/*
      3 *  Input Power Event -> APM Bridge
      4 *
      5 *  Copyright (c) 2007 Richard Purdie
      6 */
      7
      8#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
      9
     10#include <linux/module.h>
     11#include <linux/input.h>
     12#include <linux/slab.h>
     13#include <linux/init.h>
     14#include <linux/tty.h>
     15#include <linux/delay.h>
     16#include <linux/pm.h>
     17#include <linux/apm-emulation.h>
     18
     19static void system_power_event(unsigned int keycode)
     20{
     21	switch (keycode) {
     22	case KEY_SUSPEND:
     23		apm_queue_event(APM_USER_SUSPEND);
     24		pr_info("Requesting system suspend...\n");
     25		break;
     26	default:
     27		break;
     28	}
     29}
     30
     31static void apmpower_event(struct input_handle *handle, unsigned int type,
     32			   unsigned int code, int value)
     33{
     34	/* only react on key down events */
     35	if (value != 1)
     36		return;
     37
     38	switch (type) {
     39	case EV_PWR:
     40		system_power_event(code);
     41		break;
     42
     43	default:
     44		break;
     45	}
     46}
     47
     48static int apmpower_connect(struct input_handler *handler,
     49					  struct input_dev *dev,
     50					  const struct input_device_id *id)
     51{
     52	struct input_handle *handle;
     53	int error;
     54
     55	handle = kzalloc(sizeof(struct input_handle), GFP_KERNEL);
     56	if (!handle)
     57		return -ENOMEM;
     58
     59	handle->dev = dev;
     60	handle->handler = handler;
     61	handle->name = "apm-power";
     62
     63	error = input_register_handle(handle);
     64	if (error) {
     65		pr_err("Failed to register input power handler, error %d\n",
     66		       error);
     67		kfree(handle);
     68		return error;
     69	}
     70
     71	error = input_open_device(handle);
     72	if (error) {
     73		pr_err("Failed to open input power device, error %d\n", error);
     74		input_unregister_handle(handle);
     75		kfree(handle);
     76		return error;
     77	}
     78
     79	return 0;
     80}
     81
     82static void apmpower_disconnect(struct input_handle *handle)
     83{
     84	input_close_device(handle);
     85	input_unregister_handle(handle);
     86	kfree(handle);
     87}
     88
     89static const struct input_device_id apmpower_ids[] = {
     90	{
     91		.flags = INPUT_DEVICE_ID_MATCH_EVBIT,
     92		.evbit = { BIT_MASK(EV_PWR) },
     93	},
     94	{ },
     95};
     96
     97MODULE_DEVICE_TABLE(input, apmpower_ids);
     98
     99static struct input_handler apmpower_handler = {
    100	.event =	apmpower_event,
    101	.connect =	apmpower_connect,
    102	.disconnect =	apmpower_disconnect,
    103	.name =		"apm-power",
    104	.id_table =	apmpower_ids,
    105};
    106
    107static int __init apmpower_init(void)
    108{
    109	return input_register_handler(&apmpower_handler);
    110}
    111
    112static void __exit apmpower_exit(void)
    113{
    114	input_unregister_handler(&apmpower_handler);
    115}
    116
    117module_init(apmpower_init);
    118module_exit(apmpower_exit);
    119
    120MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
    121MODULE_DESCRIPTION("Input Power Event -> APM Bridge");
    122MODULE_LICENSE("GPL");