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usb_moded-modules.c
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usb_moded-modules.c
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/**
@file usb_moded-modules.c
Copyright (C) 2010 Nokia Corporation. All rights reserved.
Copyright (C) 2012-2015 Jolla. All rights reserved.
@author: Philippe De Swert <philippe.de-swert@nokia.com>
@author: Philippe De Swert <philippe.deswert@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
*/
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <glib.h>
#include <glib/gprintf.h>
#include <libkmod.h>
#include "usb_moded.h"
#include "usb_moded-modules.h"
#include "usb_moded-log.h"
#include "usb_moded-config.h"
#include "usb_moded-dbus.h"
#include "usb_moded-dbus-private.h"
#include "usb_moded-modesetting.h"
#include "usb_moded-modes.h"
/* kmod context - initialized at start in usb_moded_init by ctx_init()
and cleaned up by ctx_cleanup() functions */
struct kmod_ctx *ctx;
/* kmod module init */
void usb_moded_module_ctx_init(void)
{
ctx = kmod_new(NULL, NULL);
kmod_load_resources(ctx);
}
/* kmod module cleanup */
void usb_moded_module_ctx_cleanup(void)
{
kmod_unref(ctx);
}
/** load module
*
* @param module Name of the module to load
* @return 0 on success, non-zero on failure
*
*/
int usb_moded_load_module(const char *module)
{
int ret = 0;
const int probe_flags = KMOD_PROBE_APPLY_BLACKLIST;
struct kmod_module *mod;
char *charging_args = NULL;
char *load = NULL;
if(!strcmp(module, MODULE_NONE))
return 0;
/* copy module to load as it might be modified if we're trying charging mode */
load = strdup(module);
if(!strcmp(module, MODULE_CHARGING) || !strcmp(module, MODULE_CHARGE_FALLBACK))
{
/* split the string in module name and argument, they are the same for MODULE_CHARGE_FALLBACK
so no need to handle them separately */
gchar **strings;
/* since the mass_storage module is the newer one and we check against it to avoid
loading failures we use it here, as we fall back to g_file_storage if g_mass_storage
fails to load */
strings = g_strsplit(MODULE_CHARGE_FALLBACK, " ", 2);
//log_debug("module args = %s, module = %s\n", strings[1], strings[0]);
charging_args = strdup(strings[1]);
/* load was already assigned. Free it to re-assign */
free(load);
load = strdup(strings[0]);
g_strfreev(strings);
}
ret = kmod_module_new_from_name(ctx, load, &mod);
/* since kmod_module_new_from_name does not check if the module
exists we test it's path in case we deal with the mass-storage one */
if(!strcmp(module, MODULE_MASS_STORAGE) &&
(kmod_module_get_path(mod) == NULL))
{
log_debug("Fallback on older g_file_storage\n");
ret = kmod_module_new_from_name(ctx, MODULE_FILE_STORAGE, &mod);
}
if(!charging_args)
ret = kmod_module_probe_insert_module(mod, probe_flags, NULL, NULL, NULL, NULL);
else
{
ret = kmod_module_probe_insert_module(mod, probe_flags, charging_args, NULL, NULL, NULL);
free(charging_args);
}
kmod_module_unref(mod);
free(load);
if( ret == 0)
log_info("Module %s loaded successfully\n", module);
else
log_info("Module %s failed to load\n", module);
return(ret);
}
/** unload module
*
* @param module Name of the module to unload
* @return 0 on success, non-zero on failure
*
*/
int usb_moded_unload_module(const char *module)
{
int ret = 0;
struct kmod_module *mod;
if(!strcmp(module, MODULE_NONE))
return 0;
kmod_module_new_from_name(ctx, module, &mod);
ret = kmod_module_remove_module(mod, KMOD_REMOVE_NOWAIT);
kmod_module_unref(mod);
return(ret);
}
/** Check which state a module is in
*
* @return 1 if loaded, 0 when not loaded
*/
static int module_state_check(const char *module)
{
int ret = 0;
struct kmod_module *mod;
kmod_module_new_from_name(ctx, module, &mod);
ret = kmod_module_get_initstate(mod);
kmod_module_unref(mod);
if( ret == KMOD_MODULE_LIVE)
return(1);
else
return(0);
}
/** find which module is loaded
*
* @return The name of the loaded module, or NULL if no modules are loaded.
*/
const char * usb_moded_find_module(void)
{
if(module_state_check("g_ether"))
return(MODULE_DEVELOPER);
else if(module_state_check("g_ncm"))
return("g_ncm");
else if(module_state_check("g_ffs"))
return(MODULE_MTP);
else if(module_state_check("g_mass_storage"))
return(MODULE_MASS_STORAGE);
else if(module_state_check("g_file_storage"))
return(MODULE_FILE_STORAGE);
else if(module_state_check(get_usb_module()))
return(get_usb_module());
/* no module loaded */
return(0);
}
/** clean up for modules when usb gets disconnected
*
* @param module The name of the module to unload
* @return 0 on success, non-zero on failure
*
*/
int usb_moded_module_cleanup(const char *module)
{
int retry = 0, failure;
if(!strcmp(module, MODULE_NONE))
goto END;
/* wait a bit for all components listening on dbus to clean up their act
sleep(2); */
/* check if things were not reconnected in that timespan
if(get_usb_connection_state())
return(0);
*/
failure = usb_moded_unload_module(module);
/* if we have MODULE_MASS_STORAGE it might be MODULE_FILE_STORAGE might
be loaded. So check and unload that one if unloading fails first time */
if(failure && !strcmp(MODULE_MASS_STORAGE, module))
failure = usb_moded_unload_module(MODULE_FILE_STORAGE);
/* if it still failed it might be the mode has not been cleaned-up correctly,
so we clean up the mode to be sure */
if(failure)
{
usb_moded_mode_cleanup(usb_moded_find_module());
}
while(failure)
{
/* module did not get unloaded. We will wait a bit and try again */
sleep(1);
/* send the REALLY disconnect message */
usb_moded_send_signal(USB_REALLY_DISCONNECT);
failure = usb_moded_unload_module(module);
log_debug("unloading failure = %d\n", failure);
if(!failure)
break;
if(!usb_moded_find_module())
goto END;
retry++;
if(retry == 2)
break;
}
if(!failure)
log_info("Module %s unloaded successfully\n", module);
else
{
log_err("Module %s did not unload! Failing and going to undefined.\n", module);
return(1);
}
END:
return(0);
}
/** try to unload modules to support switching
*
*
* @param force force unloading with a nasty clean-up on TRUE, or just try unloading when FALSE
* @return 0 on success, 1 on failure, 2 if hard clean-up failed
*/
int usb_moded_module_switch_prepare (int force)
{
const char *unload;
int ret = 1;
unload = usb_moded_find_module();
if(unload)
{
if(force)
ret = usb_moded_module_cleanup(unload);
else
ret = usb_moded_unload_module(unload);
}
if(ret && force)
return(2);
else
return(ret);
}
/** check for loaded modules and clean-up if they are not for the chosen mode
*
* @param module_name module name to check for
*
*/
void check_module_state(const char *module_name)
{
const char *module;
module = usb_moded_find_module();
if(module != NULL)
{
/* do nothing if the right module is already loaded */
if(strcmp(usb_moded_find_module(), module_name) != 0)
{
log_debug("%s not loaded, cleaning up\n", module_name);
usb_moded_module_switch_prepare(TRUE);
}
}
}