/*

 * Copyright (c) 2015 Emil Velikov <emil.l.velikov@gmail.com>

 *

 * Permission is hereby granted, free of charge, to any person obtaining a

 * copy of this software and associated documentation files (the "Software"),

 * to deal in the Software without restriction, including without limitation

 * the rights to use, copy, modify, merge, publish, distribute, sublicense,

 * and/or sell copies of the Software, and to permit persons to whom the

 * Software is furnished to do so, subject to the following conditions:

 *

 * The above copyright notice and this permission notice shall be included in

 * all copies or substantial portions of the Software.

 *

 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS

 * IN THE SOFTWARE.

 *

 */

#include <errno.h>

#include <stdio.h>

#include <stdlib.h>

#include <stdbool.h>

#include <string.h>

#include <sys/stat.h>

#include <fcntl.h>

#include <unistd.h>

#include <xf86drm.h>

static void

print_device_info(drmDevicePtr device, int i, bool print_revision)

{

    printf("device[%i]\n", i);

    printf("+-> available_nodes %#04x\n", device->available_nodes);

    printf("+-> nodes\n");

    for (int j = 0; j < DRM_NODE_MAX; j++)

        if (device->available_nodes & 1 << j)

            printf("|   +-> nodes[%d] %s\n", j, device->nodes[j]);

    printf("+-> bustype %04x\n", device->bustype);

    if (device->bustype == DRM_BUS_PCI) {

        printf("|   +-> pci\n");

        printf("|       +-> domain %04x\n",device->businfo.pci->domain);

        printf("|       +-> bus    %02x\n", device->businfo.pci->bus);

        printf("|       +-> dev    %02x\n", device->businfo.pci->dev);

        printf("|       +-> func   %1u\n", device->businfo.pci->func);

        printf("+-> deviceinfo\n");

        printf("    +-> pci\n");

        printf("        +-> vendor_id     %04x\n", device->deviceinfo.pci->vendor_id);

        printf("        +-> device_id     %04x\n", device->deviceinfo.pci->device_id);

        printf("        +-> subvendor_id  %04x\n", device->deviceinfo.pci->subvendor_id);

        printf("        +-> subdevice_id  %04x\n", device->deviceinfo.pci->subdevice_id);

        if (print_revision)

            printf("        +-> revision_id   %02x\n", device->deviceinfo.pci->revision_id);

        else

            printf("        +-> revision_id   IGNORED\n");

    } else if (device->bustype == DRM_BUS_USB) {

        printf("|   +-> usb\n");

        printf("|       +-> bus %03u\n", device->businfo.usb->bus);

        printf("|       +-> dev %03u\n", device->businfo.usb->dev);

        printf("+-> deviceinfo\n");

        printf("    +-> usb\n");

        printf("        +-> vendor  %04x\n", device->deviceinfo.usb->vendor);

        printf("        +-> product %04x\n", device->deviceinfo.usb->product);

    } else if (device->bustype == DRM_BUS_PLATFORM) {

        char **compatible = device->deviceinfo.platform->compatible;

        printf("|   +-> platform\n");

        printf("|       +-> fullname\t%s\n", device->businfo.platform->fullname);

        printf("+-> deviceinfo\n");

        printf("    +-> platform\n");

        printf("        +-> compatible\n");

        while (*compatible) {

            printf("                    %s\n", *compatible);

            compatible++;

        }

    } else if (device->bustype == DRM_BUS_HOST1X) {

        char **compatible = device->deviceinfo.host1x->compatible;

        printf("|   +-> host1x\n");

        printf("|       +-> fullname\t%s\n", device->businfo.host1x->fullname);

        printf("+-> deviceinfo\n");

        printf("    +-> host1x\n");

        printf("        +-> compatible\n");

        while (*compatible) {

            printf("                    %s\n", *compatible);

            compatible++;

        }

    } else {

        printf("Unknown/unhandled bustype\n");

    }

    printf("\n");

}

int

main(void)

{

    drmDevicePtr *devices;

    drmDevicePtr device;

    int fd, ret, max_devices;

    printf("--- Checking the number of DRM device available ---\n");

    max_devices = drmGetDevices2(0, NULL, 0);

    if (max_devices <= 0) {

        printf("drmGetDevices2() has not found any devices (errno=%d)\n",

               -max_devices);

        return 77;

    }

    printf("--- Devices reported %d ---\n", max_devices);

    devices = calloc(max_devices, sizeof(drmDevicePtr));

    if (devices == NULL) {

        printf("Failed to allocate memory for the drmDevicePtr array\n");

        return -1;

    }

    printf("--- Retrieving devices information (PCI device revision is ignored) ---\n");

    ret = drmGetDevices2(0, devices, max_devices);

    if (ret < 0) {

        printf("drmGetDevices2() returned an error %d\n", ret);

        free(devices);

        return -1;

    }

    for (int i = 0; i < ret; i++) {

        print_device_info(devices[i], i, false);

        for (int j = 0; j < DRM_NODE_MAX; j++) {

            if (devices[i]->available_nodes & 1 << j) {

                printf("--- Opening device node %s ---\n", devices[i]->nodes[j]);

                fd = open(devices[i]->nodes[j], O_RDONLY | O_CLOEXEC, 0);

                if (fd < 0) {

                    printf("Failed - %s (%d)\n", strerror(errno), errno);

                    continue;

                }

                printf("--- Retrieving device info, for node %s ---\n", devices[i]->nodes[j]);

                if (drmGetDevice2(fd, DRM_DEVICE_GET_PCI_REVISION, &device) == 0) {

                    print_device_info(device, i, true);

                    drmFreeDevice(&device);

                }

                close(fd);

            }

        }

    }

    drmFreeDevices(devices, ret);

    free(devices);

    return 0;

}