segatools/nu/hwmon.c

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#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:
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dprintf("Hwmon: Unknown ioctl %08x, write %i read %i\n",
irp->ioctl,
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(int) irp->write.nbytes,
(int) 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);
}