/*-
 * Copyright (c) 2009 Andriy Gapon <[email protected]>
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdint.h>
#include <sys/ioctl.h>
#include <mei.h>

struct therm_sensor
{
    int8_t valid;
    int32_t value;
} __attribute__((packed));

struct volt_sensor
{
    int8_t valid;
    int32_t value;
} __attribute__((packed));

struct fan_sensor
{
    int8_t valid;
    int16_t value;
} __attribute__((packed));

#define THERM_SENSOR_COUNT  12
struct therm_data
{
    int8_t status;
    struct therm_sensor data[THERM_SENSOR_COUNT];
} __attribute__((packed));

#define VOLT_SENSOR_COUNT   8
struct volt_data
{
    int8_t status;
    struct volt_sensor data[VOLT_SENSOR_COUNT];
} __attribute__((packed));

#define FAN_SENSOR_COUNT    8
struct fan_data
{
    int8_t status;
    struct fan_sensor data[FAN_SENSOR_COUNT];
} __attribute__((packed));

struct qst_cmd
{
    uint8_t cmd;
    uint16_t in_len;
    uint16_t out_len;
} __attribute__((packed));

#define QST_THERMAL_CMD     0x12
static const struct qst_cmd therm_cmd = { QST_THERMAL_CMD, 0, sizeof(struct therm_data) };

#define QST_VOLT_CMD        0x58
static const struct qst_cmd volt_cmd = { QST_VOLT_CMD, 0, sizeof(struct volt_data) };

#define QST_FAN_CMD     0x37
static const struct qst_cmd fan_cmd = { QST_FAN_CMD, 0, sizeof(struct fan_data) };

const char * const temp_names[THERM_SENSOR_COUNT] = {
    "CPU",
    "MB1",
    NULL,
    "MB2",
    "ICH",
    "MCH",
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
    NULL,
};

const char * const volt_names[VOLT_SENSOR_COUNT] = {
    "12P",
    "50P",
    "33",
    "15",
    "C0",
    NULL,
    NULL,
    NULL,
};

const char * const fan_names[FAN_SENSOR_COUNT] = {
    "CPU",
    "INL",
    "OUTL",
    "AUX",
    NULL,
    NULL,
    NULL,
    NULL,
};


#define SOME_UUID { \
    0xB9, 0x05, 0x52, 0x6B, \
    0x85, 0x81, 0x19, 0x45, \
    0xB8, 0x89, 0xD9, 0x87, \
    0x24, 0xB5, 0x86, 0x07  \
};


int main()
{
    int fd;
    int rc;
    int i;
    struct mei_connect_client_data data=SOME_UUID;

    fd = open("/dev/mei0", O_RDWR);
    if (fd < 0) {
        perror("/dev/mei0\n");
        return 1;
    }
    rc = ioctl(fd, IOCTL_MEI_CONNECT_CLIENT, &data);
    if (rc < 0) {
        perror("ioctl IOCTL_MEI_CONNECT_CLIENT failed\n");
        return 1;
    }
    printf("Ver=%d, MaxLen=%ld\n",
            data.out_client_properties.protocol_version,
            data.out_client_properties.max_msg_length);

    /* Request temp. */
    struct therm_data therm_data;
    rc = write(fd, &therm_cmd, sizeof(therm_cmd));
    if (rc < 0) {
        perror("therm write");
        return 1;
    }

    rc = read(fd, &therm_data, sizeof(therm_data));
    if (rc < 0) {
        perror("therm read");
        return 1;
    }
    for (i = 0; i < THERM_SENSOR_COUNT; i++) {
        if (therm_data.data[i].valid) {
            int32_t value = therm_data.data[i].value;
            printf("TEMP");
            if (temp_names[i])
                printf("%s", temp_names[i]);
            else
                printf("%02d", i);
            printf("\t:\t%d.%02d\n", value / 100, abs(value) % 100);
        }
    }

    /* Request fans */
    struct fan_data fan_data;
    rc = write(fd, &fan_cmd, sizeof(fan_cmd));
    if (rc < 0) {
        perror("fan write");
        return 1;
    }

    rc = read(fd, &fan_data, sizeof(fan_data));
    if (rc < 0) {
        perror("fan read");
        return 1;
    }
    for (i = 0; i < FAN_SENSOR_COUNT; i++) {
        if (fan_data.data[i].valid) {
            int32_t value = fan_data.data[i].value;
            printf("FAN");
            if (fan_names[i])
                printf("%s", fan_names[i]);
            else
                printf("%02d", i);
            printf("\t:\t%d\n", value);
        }
    }

    /* Request volts. */
    struct volt_data volt_data;
    rc = write(fd, &volt_cmd, sizeof(volt_cmd));
    if (rc < 0) {
        perror("volts write");
        return 1;
    }

    rc = read(fd, &volt_data, sizeof(volt_data));
    if (rc < 0) {
        perror("volts read");
        return 1;
    }
    for (i = 0; i < VOLT_SENSOR_COUNT; i++) {
        if (volt_data.data[i].valid) {
            int32_t value = volt_data.data[i].value;
            printf("V");
            if (volt_names[i])
                printf("%s", volt_names[i]);
            else
                printf("%02d", i);
            printf("\t:\t%+d.%03d\n", value / 1000, abs(value) % 1000);
        }
    }

    close(fd);
    return 0;
}