nu/hwmon.c: Add emulated hardware monitoring driver

This commit is contained in:
Tau 2018-11-08 10:17:47 -05:00
parent 2c6e202b38
commit 93bf47fb76
3 changed files with 95 additions and 0 deletions

90
nu/hwmon.c Normal file
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@ -0,0 +1,90 @@
#include <windows.h>
#include <assert.h>
#include <string.h>
#include "util/dprintf.h"
#include "hook/iohook.h"
#include "nu/hwmon.h"
enum {
HWMON_IOCTL_READ_CPU_TEMP = 0x80006000,
};
static HRESULT hwmon_handle_irp(struct irp *irp);
static HRESULT hwmon_handle_open(struct irp *irp);
static HRESULT hwmon_handle_close(struct irp *irp);
static HRESULT hwmon_handle_ioctl(struct irp *irp);
static HRESULT hwmon_ioctl_read_cpu_temp(struct irp *irp);
static HANDLE hwmon_fd;
void hwmon_hook_init(void)
{
hwmon_fd = iohook_open_dummy_fd();
iohook_push_handler(hwmon_handle_irp);
}
static HRESULT hwmon_handle_irp(struct irp *irp)
{
assert(irp != NULL);
if (irp->op != IRP_OP_OPEN && irp->fd != hwmon_fd) {
return iohook_invoke_next(irp);
}
switch (irp->op) {
case IRP_OP_OPEN: return hwmon_handle_open(irp);
case IRP_OP_CLOSE: return hwmon_handle_close(irp);
case IRP_OP_IOCTL: return hwmon_handle_ioctl(irp);
default: return HRESULT_FROM_WIN32(ERROR_INVALID_FUNCTION);
}
}
static HRESULT hwmon_handle_open(struct irp *irp)
{
if (wcscmp(irp->open_filename, L"\\\\.\\sghwmonitor") != 0) {
return iohook_invoke_next(irp);
}
dprintf("Hwmon: Opened device\n");
irp->fd = hwmon_fd;
return S_OK;
}
static HRESULT hwmon_handle_close(struct irp *irp)
{
dprintf("Hwmon: Closed device\n");
return S_OK;
}
static HRESULT hwmon_handle_ioctl(struct irp *irp)
{
switch (irp->ioctl) {
case HWMON_IOCTL_READ_CPU_TEMP:
return hwmon_ioctl_read_cpu_temp(irp);
default:
dprintf("Hwmon: Unknown ioctl %08x write %i read %i\n",
irp->ioctl,
irp->write.nbytes,
irp->read.nbytes);
return HRESULT_FROM_WIN32(ERROR_INVALID_FUNCTION);
}
}
static HRESULT hwmon_ioctl_read_cpu_temp(struct irp *irp)
{
/* Assuming this is Celsius. It also seems to be biased by -23 (based on the
caller code) despite being a 32-bit int. */
dprintf("Hwmon: Read CPU temperature\n");
return iobuf_write_le32(&irp->read, 52);
}

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nu/hwmon.h Normal file
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#pragma once
void hwmon_hook_init(void);

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@ -15,6 +15,8 @@ nu_lib = static_library(
'gpio.c', 'gpio.c',
'gpio.h', 'gpio.h',
'guid.c', 'guid.c',
'hwmon.c',
'hwmon.h',
'nusec.c', 'nusec.c',
'nusec.h', 'nusec.h',
'nvram.c', 'nvram.c',