udev-search.c
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* @file udev-search.c
*
* This is a basic utility to check for potential
* viable paths to use for usb_moded.
*
* This is in case usb_moded can not figure it out for itself.
*
* compile with gcc -o udev-search udev-search.c -ludev
*
* Copyright (C) 2014-2018 Jolla. All rights reserved.
*
* @author: Philippe De Swert <philippe.deswert@jollamobile.com>
* @author: Simo Piiroinen <simo.piiroinen@jollamobile.com>
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the Lesser GNU General Public License
* version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the Lesser GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
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#include <stdio.h>
#include <stdlib.h>
#include <locale.h>
#include <unistd.h>
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#include <string.h>
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#include <poll.h>
#include <libudev.h>
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/* ========================================================================= *
* Protorypes
* ========================================================================= */
/* -- check -- */
static int check_device_is_usb_power_supply(const char *syspath);
/* ========================================================================= *
* Functions
* ========================================================================= */
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static int check_device_is_usb_power_supply(const char *syspath)
{
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struct udev *udev;
struct udev_device *dev = 0;
const char *udev_name;
int score = 0;
udev = udev_new();
dev = udev_device_new_from_syspath(udev, syspath);
if(!dev)
return 0;
udev_name = udev_device_get_sysname(dev);
printf("device name = %s\n", udev_name);
/* check it is no battery */
if(strstr(udev_name, "battery") ||
strstr(udev_name, "BAT"))
return 0;
if(strstr(udev_name, "usb"))
score = score + 10;
if(strstr(udev_name, "charger"))
score = score + 5;
if(udev_device_get_property_value(dev, "POWER_SUPPLY_PRESENT"))
{
score = score + 5;
printf("present property found\n");
}
if(udev_device_get_property_value(dev, "POWER_SUPPLY_ONLINE"))
{
score = score + 10;
printf("online property found\n");
}
if(udev_device_get_property_value(dev, "POWER_SUPPLY_TYPE"))
{
score = score + 10;
printf("type property found\n");
}
return(score);
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int main (int argc, char **argv)
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(void)argc;
(void)argv;
struct udev *udev;
struct udev_enumerate *list;
struct udev_list_entry *list_entry, *first_entry;
const char *udev_name;
int ret = 0, score = 0;
typedef struct power_device {
const char *syspath;
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int score;
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} power_device;
struct power_device power_dev;
power_dev.score = 0;
udev = udev_new();
list = udev_enumerate_new(udev);
ret = udev_enumerate_add_match_subsystem(list, "power_supply");
ret = udev_enumerate_scan_devices(list);
if(ret < 0)
{
printf("List empty\n");
exit(1);
}
first_entry = udev_enumerate_get_list_entry(list);
udev_list_entry_foreach(list_entry, first_entry)
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udev_name = udev_list_entry_get_name(list_entry);
score = check_device_is_usb_power_supply(udev_name);
printf("power_supply device name = %s score = %d\n", udev_name, score);
if(score)
{
if(score > power_dev.score)
{
power_dev.score = score;
power_dev.syspath = udev_name;
}
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printf("most likely power supply device = %s\n", power_dev.syspath);
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exit(0);