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usb_moded-modesetting.c
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usb_moded-modesetting.c
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/**
@file usb_moded-modesetting.c
Copyright (C) 2010 Nokia Corporation. All rights reserved.
@author: Philippe De Swert <philippe.de-swert@nokia.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
*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdio.h>
#include <sys/stat.h>
#include <limits.h>
#include <glib.h>
#include "usb_moded.h"
#include "usb_moded-modules.h"
#include "usb_moded-modes.h"
#include "usb_moded-log.h"
#include "usb_moded-dbus.h"
#include "usb_moded-dbus-private.h"
#include "usb_moded-appsync.h"
#include "usb_moded-config.h"
#include "usb_moded-modesetting.h"
#include "usb_moded-network.h"
#include "usb_moded-android.h"
static void report_mass_storage_blocker(const char *mountpoint, int try);
guint delayed_network = 0;
int write_to_file(const char *path, const char *text)
{
int err = -1;
int fd = -1;
size_t todo = 0;
/* if either path or the text to be written are not there
we return an error */
if(!text || !path)
return err;
todo = strlen(text);
/* no O_CREAT -> writes only to already existing files */
if( (fd = TEMP_FAILURE_RETRY(open(path, O_WRONLY))) == -1 )
{
log_warning("open(%s): %m", path);
goto cleanup;
}
while( todo > 0 )
{
ssize_t n = TEMP_FAILURE_RETRY(write(fd, text, todo));
if( n < 0 )
{
log_warning("write(%s): %m", path);
goto cleanup;
}
todo -= n;
text += n;
}
err = 0;
cleanup:
if( fd != -1 ) TEMP_FAILURE_RETRY(close(fd));
return err;
}
static gboolean network_retry(gpointer data)
{
usb_network_up(data);
return(FALSE);
}
static int set_mass_storage_mode(struct mode_list_elem *data)
{
gchar *command;
char command2[256], *real_path = NULL, *mountpath;
char *mount;
gchar **mounts;
int ret = 0, i = 0, mountpoints = 0, fua = 0, try = 0;
/* send unmount signal so applications can release their grasp on the fs, do this here so they have time to act */
usb_moded_send_signal(USB_PRE_UNMOUNT);
fua = find_sync();
mount = find_mounts();
if(mount)
{
mounts = g_strsplit(mount, ",", 0);
/* check amount of mountpoints */
for(i=0 ; mounts[i] != NULL; i++)
{
mountpoints++;
}
if(strcmp(data->mode_module, MODULE_NONE))
{
/* check if the file storage module has been loaded with sufficient luns in the parameter,
if not, unload and reload or load it. Since mountpoints start at 0 the amount of them is one more than their id */
sprintf(command2, "/sys/devices/platform/musb_hdrc/gadget/gadget-lun%d/file", (mountpoints - 1) );
if(access(command2, R_OK) == -1)
{
log_debug("%s does not exist, unloading and reloading mass_storage\n", command2);
usb_moded_unload_module(MODULE_MASS_STORAGE);
sprintf(command2, "modprobe %s luns=%d \n", MODULE_MASS_STORAGE, mountpoints);
log_debug("usb-load command = %s \n", command2);
ret = system(command2);
if(ret)
return(ret);
}
}
/* umount filesystems */
for(i=0 ; mounts[i] != NULL; i++)
{
/* check if filesystem is mounted or not, if ret = 1 it is already unmounted */
real_path = realpath(mounts[i], NULL);
if(real_path)
mountpath = real_path;
else
mountpath = mounts[i];
umount: command = g_strconcat("mount | grep ", mountpath, NULL);
ret = system(command);
g_free(command);
if(!ret)
{
/* no check for / needed as that will fail to umount anyway */
command = g_strconcat("umount ", mountpath, NULL);
log_debug("unmount command = %s\n", command);
ret = system(command);
g_free(command);
if(ret != 0)
{
if(try != 3)
{
try++;
sleep(1);
log_err("Umount failed. Retrying\n");
report_mass_storage_blocker(mount, 1);
goto umount;
}
else
{
log_err("Unmounting %s failed\n", mount);
report_mass_storage_blocker(mount, 2);
usb_moded_send_error_signal(UMOUNT_ERROR);
return(ret);
}
}
}
else
/* already unmounted. Set return value to 0 since there is no error */
ret = 0;
}
/* activate mounts after sleeping 1s to be sure enumeration happened and autoplay will work in windows*/
sleep(1);
for(i=0 ; mounts[i] != NULL; i++)
{
if(strcmp(data->mode_module, MODULE_NONE))
{
sprintf(command2, "echo %i > /sys/devices/platform/musb_hdrc/gadget/gadget-lun%d/nofua", fua, i);
log_debug("usb lun = %s active\n", command2);
system(command2);
sprintf(command2, "/sys/devices/platform/musb_hdrc/gadget/gadget-lun%d/file", i);
log_debug("usb lun = %s active\n", command2);
write_to_file(command2, mounts[i]);
}
else
{
write_to_file("/sys/class/android_usb/android0/enable", "0");
write_to_file("/sys/class/android_usb/android0/functions", "mass_storage");
//write_to_file("/sys/class/android_usb/f_mass_storage/lun/nofua", fua);
write_to_file("/sys/class/android_usb/f_mass_storage/lun/file", mount);
write_to_file("/sys/class/android_usb/android0/enable", "1");
}
}
g_strfreev(mounts);
g_free(mount);
if(real_path)
free(real_path);
}
/* only send data in use signal in case we actually succeed */
if(!ret)
usb_moded_send_signal(DATA_IN_USE);
return(ret);
}
static int unset_mass_storage_mode(struct mode_list_elem *data)
{
gchar *command;
char command2[256], *real_path = NULL, *mountpath;
char *mount;
gchar **mounts;
int ret = 1, i = 0;
mount = find_mounts();
if(mount)
{
mounts = g_strsplit(mount, ",", 0);
for(i=0 ; mounts[i] != NULL; i++)
{
/* check if it is still or already mounted, if so (ret==0) skip mounting */
real_path = realpath(mounts[i], NULL);
if(real_path)
mountpath = real_path;
else
mountpath = mounts[i];
command = g_strconcat("mount | grep ", mountpath, NULL);
ret = system(command);
g_free(command);
if(ret)
{
command = g_strconcat("mount ", mountpath, NULL);
log_debug("mount command = %s\n",command);
ret = system(command);
g_free(command);
/* mount returns 0 if success */
if(ret != 0 )
{
log_err("Mounting %s failed\n", mount);
if(ret)
{
g_free(mount);
mount = find_alt_mount();
if(mount)
{
command = g_strconcat("mount -t tmpfs tmpfs -o ro --size=512K ", mount, NULL);
log_debug("Total failure, mount ro tmpfs as fallback\n");
ret = system(command);
g_free(command);
}
usb_moded_send_error_signal(RE_MOUNT_FAILED);
}
}
}
if(data != NULL)
{
if(!strcmp(data->mode_module, MODULE_NONE))
{
log_debug("Disable android mass storage\n");
write_to_file("/sys/class/android_usb/f_mass_storage/lun/file", "0");
write_to_file("/sys/class/android_usb/android0/enable", "0");
}
}
else
{
sprintf(command2, "echo \"\" > /sys/devices/platform/musb_hdrc/gadget/gadget-lun%d/file", i);
log_debug("usb lun = %s inactive\n", command2);
system(command2);
}
}
g_strfreev(mounts);
g_free(mount);
if(real_path)
free(real_path);
}
return(ret);
}
static void report_mass_storage_blocker(const char *mountpoint, int try)
{
FILE *stream = 0;
gchar *lsof_command = 0;
int count = 0;
lsof_command = g_strconcat("lsof ", mountpoint, NULL);
if( (stream = popen(lsof_command, "r")) )
{
char *text = 0;
size_t size = 0;
while( getline(&text, &size, stream) >= 0 )
{
/* skip the first line as it does not contain process info */
if(count != 0)
{
gchar **split = 0;
split = g_strsplit((const gchar*)text, " ", 2);
log_err("Mass storage blocked by process %s\n", split[0]);
usb_moded_send_error_signal(split[0]);
g_strfreev(split);
}
count++;
}
pclose(stream);
}
g_free(lsof_command);
if(try == 2)
log_err("Setting Mass storage blocked. Giving up.\n");
}
int set_dynamic_mode(void)
{
struct mode_list_elem *data;
int ret = 1;
int network = 1;
data = get_usb_mode_data();
if(!data)
return(ret);
if(data->mass_storage)
{
return set_mass_storage_mode(data);
}
#ifdef APP_SYNC
if(data->appsync)
if(activate_sync(data->mode_name)) /* returns 1 on error */
{
log_debug("Appsync failure");
return(ret);
}
#endif
/* make sure things are disabled before changing functionality */
if(data->softconnect_disconnect)
{
write_to_file(data->softconnect_path, data->softconnect_disconnect);
}
/* set functionality first, then enable */
if(data->android_extra_sysfs_value && data->android_extra_sysfs_path)
{
ret = write_to_file(data->android_extra_sysfs_path, data->android_extra_sysfs_value);
}
if(data->android_extra_sysfs_value2 && data->android_extra_sysfs_path2)
{
write_to_file(data->android_extra_sysfs_path2, data->android_extra_sysfs_value2);
}
if(data->sysfs_path)
{
write_to_file(data->sysfs_path, data->sysfs_value);
log_debug("writing to file %s, value %s\n", data->sysfs_path, data->sysfs_value);
}
if(data->idProduct)
{
/* only works for android since the idProduct is a module parameter */
set_android_productid(data->idProduct);
}
if(data->idVendorOverride)
{
/* only works for android since the idProduct is a module parameter */
set_android_vendorid(data->idVendorOverride);
}
/* enable the device */
if(data->softconnect)
{
ret = write_to_file(data->softconnect_path, data->softconnect);
}
/* functionality should be enabled, so we can enable the network now */
if(data->network)
{
#ifdef DEBIAN
char command[256];
g_snprintf(command, 256, "ifdown %s ; ifup %s", data->network_interface, data->network_interface);
system(command);
#else
usb_network_down(data);
network = usb_network_up(data);
#endif /* DEBIAN */
}
/* try a second time to bring up the network if it failed the first time,
this can happen with functionfs based gadgets (which is why we sleep for a bit */
if(network != 0 && data->network)
{
log_debug("Retry setting up the network later\n");
delayed_network = g_timeout_add_seconds(3, network_retry, data);
}
/* Needs to be called before application post synching so
that the dhcp server has the right config */
if(data->nat || data->dhcp_server)
usb_network_set_up_dhcpd(data);
/* no need to execute the post sync if there was an error setting the mode */
if(data->appsync && !ret)
{
/* let's sleep for a bit (350ms) to allow interfaces to settle before running postsync */
usleep(350000);
activate_sync_post(data->mode_name);
}
#ifdef CONNMAN
if(data->connman_tethering)
connman_set_tethering(data->connman_tethering, TRUE);
#endif
if(ret)
usb_moded_send_error_signal(MODE_SETTING_FAILED);
return(ret);
}
void unset_dynamic_mode(void)
{
struct mode_list_elem *data;
data = get_usb_mode_data();
if(delayed_network)
{
g_source_remove(delayed_network);
delayed_network = 0;
}
/* the modelist could be empty */
if(!data)
return;
if(!strcmp(data->mode_name, MODE_MASS_STORAGE))
{
unset_mass_storage_mode(data);
return;
}
#ifdef CONNMAN
if(data->connman_tethering)
connman_set_tethering(data->connman_tethering, FALSE);
#endif
if(data->network)
{
usb_network_down(data);
}
/* disconnect before changing functionality */
if(data->softconnect_disconnect)
{
write_to_file(data->softconnect_path, data->softconnect_disconnect);
}
if(data->sysfs_path)
{
write_to_file(data->sysfs_path, data->sysfs_reset_value);
log_debug("writing to file %s, value %s\n", data->sysfs_path, data->sysfs_reset_value);
}
/* restore vendorid if the mode had an override */
if(data->idVendorOverride)
{
char *id;
id = get_android_vendor_id();
set_android_vendorid(id);
g_free(id);
}
}
/** clean up mode changes or extra actions to perform after a mode change
* @param module Name of module currently in use
* @return 0 on success, non-zero on failure
*
*/
int usb_moded_mode_cleanup(const char *module)
{
log_debug("Cleaning up mode\n");
if(!module)
{
log_warning("No module found to unload. Skipping cleanup\n");
return 0;
}
#ifdef APP_SYNC
appsync_stop();
#endif /* APP_SYNC */
if(!strcmp(module, MODULE_MASS_STORAGE)|| !strcmp(module, MODULE_FILE_STORAGE))
{
/* no clean-up needs to be done when we come from charging mode. We need
to check since we use fake mass-storage for charging */
if(!strcmp(MODE_CHARGING, get_usb_mode()) || !strcmp(MODE_CHARGING_FALLBACK, get_usb_mode()))
return 0;
unset_mass_storage_mode(NULL);
}
else if(get_usb_mode_data())
unset_dynamic_mode();
return(0);
}