/*
 * Copyright (C) 2020 Arnaud Ferraris <arnaud.ferraris@gmail.com>
 *
 * SPDX-License-Identifier: GPL-3.0-or-later
 */

#include "udev.h"

#include <string.h>

static void udev_event_cb(GUdevClient *client, gchar *action, GUdevDevice *device, gpointer data)
{
    struct EG25Manager *manager = data;
    const gchar *prop;
    long vid = 0, pid = 0;

    /*
     * Act only if the device is the one identified as a modem by MM/ofono
     */
    if (!manager->modem_usb_id ||
        strcmp(g_udev_device_get_name(device), manager->modem_usb_id) != 0) {
        return;
    }

    prop = g_udev_device_get_property(device, "ID_VENDOR_ID");
    if (prop)
        vid = strtol(prop, NULL, 16);

    prop = g_udev_device_get_property(device, "ID_MODEL_ID");
    if (prop)
        pid = strtol(prop, NULL, 16);

    if (strcmp(action, "bind") == 0 && vid != manager->usb_vid && pid != manager->usb_pid) {
        /*
         * Modem is probably executing a FW upgrade, make sure we don't interrupt it
         */
        if (manager->schedule_reset_timer != 0) {
            g_message("Modem re-appeared with different VID/PID, cancel reset.");
            g_source_remove(manager->schedule_reset_timer);
            manager->schedule_reset_timer = 0;
        }
        manager->modem_state = EG25_STATE_UPDATING;
    }

    if (strcmp(action, "unbind") != 0 ||
        manager->modem_state == EG25_STATE_UPDATING ||
        manager->modem_state == EG25_STATE_RESETTING ||
        manager->complete_reset_timer != 0 ||
        manager->schedule_reset_timer != 0) {
        return;
    }

    g_message("Lost modem, resetting...");
    manager->schedule_reset_timer = g_timeout_add_seconds(3, G_SOURCE_FUNC(modem_reset), manager);
}

void udev_init (struct EG25Manager *manager, toml_table_t *config[])
{
    const char * const subsystems[] = { "usb", NULL };

    manager->udev = g_udev_client_new(subsystems);
    g_signal_connect(manager->udev, "uevent", G_CALLBACK(udev_event_cb), manager);

    return;
}

void udev_destroy (struct EG25Manager *manager)
{
    if (manager->udev) {
        g_object_unref(manager->udev);
        manager->udev = NULL;
    }
}