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systemd-stable/udev_sysfs.c

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/*
* udev_sysfs.c - sysfs linux kernel specific knowledge
*
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation version 2 of the License.
*
* 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 GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <sys/stat.h>
#include "libsysfs/sysfs/libsysfs.h"
#include "udev_version.h"
#include "udev_sysfs.h"
#include "udev_utils.h"
#include "logging.h"
/* list of subsystem specific files, NULL if there is no file to wait for */
static const struct subsystem_file {
const char *subsystem;
const char *file;
} subsystem_files[] = {
{ .subsystem = "class", .file = NULL },
{ .subsystem = "net", .file = "ifindex" },
{ .subsystem = "scsi_host", .file = "unique_id" },
{ .subsystem = "scsi_device", .file = NULL },
{ .subsystem = "pcmcia_socket", .file = "card_type" },
{ .subsystem = "usb_host", .file = NULL },
{ .subsystem = "bluetooth", .file = "address" },
{ .subsystem = "firmware", .file = "data" },
{ .subsystem = "i2c-adapter", .file = NULL },
{ .subsystem = "pci_bus", .file = NULL },
{ .subsystem = "ieee1394", .file = NULL },
{ .subsystem = "ieee1394_host", .file = NULL },
{ .subsystem = "ieee1394_node", .file = NULL },
{ .subsystem = "fc_transport", .file = "port_id" },
{ .subsystem = "fc_host", .file = "port_id" },
{ .subsystem = "spi_transport", .file = "width" },
{ .subsystem = "spi_host", .file = "width" },
{ NULL, NULL }
};
int subsystem_expect_no_dev(const char *subsystem)
{
const struct subsystem_file *file;
for (file = subsystem_files; file->subsystem != NULL; file++)
if (strcmp(subsystem, file->subsystem) == 0)
return 1;
return 0;
}
/* get subsystem specific files, returns "dev" if no other found */
static const char *get_subsystem_specific_file(const char *subsystem)
{
const struct subsystem_file *file;
/* look if we want to look for another file instead of "dev" */
for (file = subsystem_files; file->subsystem != NULL; file++)
if (strcmp(subsystem, file->subsystem) == 0)
return file->file;
return "dev";
}
/* wait for class pecific file to show up */
static int wait_for_class_device_attributes(struct sysfs_class_device *class_dev,
const char **error)
{
const char *file;
char filename[SYSFS_PATH_MAX];
int loop;
file = get_subsystem_specific_file(class_dev->classname);
if (file == NULL) {
dbg("class '%s' has no file to wait for", class_dev->classname);
return 0;
}
snprintf(filename, SYSFS_PATH_MAX-1, "%s/%s", class_dev->path, file);
dbg("looking at class '%s' for specific file '%s'", class_dev->classname, filename);
loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
while (--loop) {
struct stat stats;
if (stat(class_dev->path, &stats) == -1) {
dbg("'%s' now disappeared (probably remove has beaten us)", class_dev->path);
return -ENODEV;
}
if (stat(filename, &stats) == 0) {
dbg("class '%s' specific file '%s' found", class_dev->classname, file);
return 0;
}
usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
}
dbg("error: getting class '%s' specific file '%s'", class_dev->classname, file);
if (error)
*error = "class specific file unavailable";
return -ENOENT;
}
/* check if we need to wait for a physical device */
static int class_device_expect_no_device_link(struct sysfs_class_device *class_dev)
{
/* list of devices without a "device" symlink to the physical device
* if device is set to NULL, no devices in that subsystem has a link */
static const struct class_device {
const char *subsystem;
const char *device;
} class_device[] = {
{ .subsystem = "block", .device = "double" },
{ .subsystem = "block", .device = "nb" },
{ .subsystem = "block", .device = "ram" },
{ .subsystem = "block", .device = "loop" },
{ .subsystem = "block", .device = "fd" },
{ .subsystem = "block", .device = "md" },
{ .subsystem = "block", .device = "dos_cd" },
{ .subsystem = "block", .device = "rflash" },
{ .subsystem = "block", .device = "rom" },
{ .subsystem = "block", .device = "rrom" },
{ .subsystem = "block", .device = "flash" },
{ .subsystem = "block", .device = "msd" },
{ .subsystem = "block", .device = "sbpcd" },
{ .subsystem = "block", .device = "pcd" },
{ .subsystem = "block", .device = "pf" },
{ .subsystem = "block", .device = "scd" },
{ .subsystem = "block", .device = "ubd" },
{ .subsystem = "block", .device = "dm-" },
{ .subsystem = "block", .device = "bcrypt" },
{ .subsystem = "input", .device = "event" },
{ .subsystem = "input", .device = "mice" },
{ .subsystem = "input", .device = "mouse" },
{ .subsystem = "input", .device = "ts" },
{ .subsystem = "vc", .device = NULL },
{ .subsystem = "tty", .device = NULL },
{ .subsystem = "cpuid", .device = "cpu" },
{ .subsystem = "graphics", .device = "fb" },
{ .subsystem = "mem", .device = NULL },
{ .subsystem = "misc", .device = NULL },
{ .subsystem = "msr", .device = NULL },
{ .subsystem = "netlink", .device = NULL },
{ .subsystem = "net", .device = "sit" },
{ .subsystem = "net", .device = "lo" },
{ .subsystem = "net", .device = "tap" },
{ .subsystem = "net", .device = "ipsec" },
{ .subsystem = "net", .device = "dummy" },
{ .subsystem = "net", .device = "irda" },
{ .subsystem = "net", .device = "ppp" },
{ .subsystem = "net", .device = "tun" },
{ .subsystem = "net", .device = "pan" },
{ .subsystem = "net", .device = "bnep" },
{ .subsystem = "net", .device = "vmnet" },
{ .subsystem = "net", .device = "ippp" },
{ .subsystem = "net", .device = "nlv" },
{ .subsystem = "net", .device = "atml" },
{ .subsystem = "ppp", .device = NULL },
{ .subsystem = "sound", .device = NULL },
{ .subsystem = "printer", .device = "lp" },
{ .subsystem = "ppdev", .device = NULL },
{ .subsystem = "nvidia", .device = NULL },
{ .subsystem = "video4linux", .device = "vbi" },
{ .subsystem = "dvb", .device = NULL },
{ .subsystem = "lirc", .device = NULL },
{ .subsystem = "firmware", .device = NULL },
{ .subsystem = "drm", .device = NULL },
{ .subsystem = "pci_bus", .device = NULL },
{ .subsystem = "ieee1394", .device = NULL },
{ .subsystem = "ieee1394_host", .device = NULL },
{ .subsystem = "ieee1394_node", .device = NULL },
{ .subsystem = "raw", .device = NULL },
{ .subsystem = "zaptel", .device = NULL },
{ .subsystem = "tiglusb", .device = NULL },
{ .subsystem = "ppdev", .device = NULL },
{ .subsystem = "ticables", .device = NULL },
{ .subsystem = "snsc", .device = NULL },
{ .subsystem = "staliomem", .device = NULL },
{ .subsystem = "tape", .device = NULL },
{ .subsystem = "ip2", .device = NULL },
{ .subsystem = "tpqic02", .device = NULL },
{ .subsystem = "dsp56k", .device = NULL },
{ .subsystem = "zft", .device = NULL },
{ .subsystem = "adb", .device = NULL },
{ .subsystem = "cosa", .device = NULL },
{ .subsystem = "pg", .device = NULL },
{ .subsystem = "pt", .device = NULL },
{ .subsystem = "capi", .device = NULL },
{ NULL, NULL }
};
const struct class_device *classdevice;
int len;
/* the kernel may tell us what to wait for */
if (kernel_release_satisfactory(2,6,10) > 0)
if (getenv("PHYSDEVPATH") == NULL) {
dbg("the kernel says, that there is no physical device for '%s'", class_dev->path);
return 1;
}
for (classdevice = class_device; classdevice->subsystem != NULL; classdevice++) {
if (strcmp(class_dev->classname, classdevice->subsystem) == 0) {
/* see if no device in this class is expected to have a device-link */
if (classdevice->device == NULL)
return 1;
len = strlen(classdevice->device);
/* see if device name matches */
if (strncmp(class_dev->name, classdevice->device, len) != 0)
continue;
/* exact name match */
if (strlen(class_dev->name) == len)
return 1;
/* name match with instance number */
if (isdigit(class_dev->name[len]))
return 1;
}
}
return 0;
}
/* skip waiting for the bus of the devices device */
static int class_device_expect_no_bus(struct sysfs_class_device *class_dev)
{
static const char *devices_without_bus[] = {
"scsi_host",
"i2c-adapter",
"i2c-dev",
NULL
};
const char **device;
for (device = devices_without_bus; *device != NULL; device++) {
int len = strlen(*device);
if (strncmp(class_dev->classname, *device, len) == 0)
return 1;
}
return 0;
}
/* wait for a devices device specific file to show up */
int wait_for_devices_device(struct sysfs_device *devices_dev,
const char **error)
{
static const struct device_file {
const char *bus;
const char *file;
} device_files[] = {
{ .bus = "scsi", .file = "vendor" },
{ .bus = "usb", .file = "idVendor" },
{ .bus = "usb", .file = "iInterface" },
{ .bus = "usb", .file = "bNumEndpoints" },
{ .bus = "usb-serial", .file = "detach_state" },
{ .bus = "ide", .file = "detach_state" },
{ .bus = "pci", .file = "vendor" },
{ .bus = "platform", .file = "detach_state" },
{ .bus = "pcmcia", .file = "detach_state" },
{ .bus = "i2c", .file = "detach_state" },
{ .bus = "ieee1394", .file = "node_count" },
{ .bus = "ieee1394", .file = "nodeid" },
{ .bus = "ieee1394", .file = "address" },
{ .bus = "bttv-sub", .file = NULL },
{ .bus = "pnp", .file = "detach_state" },
{ .bus = "eisa", .file = "detach_state" },
{ .bus = "pseudo", .file = "detach_state" },
{ .bus = "mmc", .file = "detach_state" },
{ .bus = "macio", .file = "detach_state" },
{ .bus = "of_platform", .file = "detach_state" },
{ .bus = "vio", .file = "detach_state" },
{ .bus = "ecard", .file = "detach_state" },
{ .bus = "sa1111-rab", .file = "detach_state" },
{ .bus = "amba", .file = "detach_state" },
{ .bus = "locomo-bus", .file = "detach_state" },
{ .bus = "logicmodule", .file = "detach_state" },
{ .bus = "parisc", .file = "detach_state" },
{ .bus = "ocp", .file = "detach_state" },
{ .bus = "dio", .file = "detach_state" },
{ .bus = "MCA", .file = "detach_state" },
{ .bus = "wl", .file = "detach_state" },
{ .bus = "ccwgroup", .file = "detach_state" },
{ .bus = "css", .file = "detach_state" },
{ .bus = "ccw", .file = "detach_state" },
{ .bus = "iucv", .file = "detach_state" },
{ NULL, NULL }
};
const struct device_file *devicefile;
int loop;
/* the kernel may tell us what to wait for */
if (kernel_release_satisfactory(2,6,10) > 0)
if (getenv("PHYSDEVBUS") == NULL) {
dbg("the kernel says, that there is no bus for '%s'", devices_dev->path);
return 0;
}
/* wait for the bus device link to the devices device */
loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
while (--loop) {
if (sysfs_get_device_bus(devices_dev) == 0)
break;
usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
}
if (loop == 0) {
dbg("error: getting bus device link");
if (error)
*error = "no bus device link";
return -1;
}
dbg("bus device link found for bus '%s'", devices_dev->bus);
/* wait for a bus device specific file to show up */
loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
while (--loop) {
int found_bus_type = 0;
for (devicefile = device_files; devicefile->bus != NULL; devicefile++) {
if (strcmp(devices_dev->bus, devicefile->bus) == 0) {
char filename[SYSFS_PATH_MAX];
struct stat stats;
if (devicefile->file == NULL) {
dbg("bus '%s' has no file to wait for", devices_dev->bus);
return 0;
}
found_bus_type = 1;
snprintf(filename, SYSFS_PATH_MAX-1, "%s/%s", devices_dev->path, devicefile->file);
dbg("looking at bus '%s' device for specific file '%s'", devices_dev->bus, filename);
if (stat(filename, &stats) == 0) {
dbg("bus '%s' device specific file '%s' found", devices_dev->bus, devicefile->file);
return 0;
}
}
}
if (found_bus_type == 0) {
if (error)
*error = "unknown bus";
info("error: unknown bus, please report to "
"<linux-hotplug-devel@lists.sourceforge.net> '%s'", devices_dev->bus);
return -1;
}
usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
}
dbg("error: getting '%s' device specific file '%s'", devices_dev->bus, devicefile->file);
if (error)
*error = "bus device specific file unavailable";
return -1;
}
struct sysfs_class_device *wait_class_device_open(const char *path)
{
struct sysfs_class_device *class_dev;
int loop;
loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
while (--loop) {
class_dev = sysfs_open_class_device_path(path);
if (class_dev)
break;
usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
}
return (class_dev);
}
int wait_for_class_device(struct sysfs_class_device *class_dev,
const char **error)
{
struct sysfs_class_device *class_dev_parent;
struct sysfs_device *devices_dev = NULL;
int loop;
if (wait_for_class_device_attributes(class_dev, error) != 0)
return -ENOENT;
/* skip devices without devices-link */
if (class_device_expect_no_device_link(class_dev)) {
dbg("no device symlink expected for '%s', ", class_dev->name);
return 0;
}
/* the symlink may be on the parent device */
class_dev_parent = sysfs_get_classdev_parent(class_dev);
if (class_dev_parent)
dbg("looking at parent device for device link '%s'", class_dev_parent->path);
/* wait for the symlink to the devices device */
dbg("waiting for symlink to devices device");
loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
while (--loop) {
if (class_dev_parent)
devices_dev = sysfs_get_classdev_device(class_dev_parent);
else
devices_dev = sysfs_get_classdev_device(class_dev);
if (devices_dev)
break;
usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
}
if (!devices_dev) {
dbg(" error: no devices device symlink found");
if (error)
*error = "no device symlink";
return -ENODEV;
}
dbg("device symlink found pointing to '%s'", devices_dev->path);
/* wait for the devices device */
if (class_device_expect_no_bus(class_dev)) {
dbg("no bus device expected for '%s', ", class_dev->classname);
return 0;
}
return wait_for_devices_device(devices_dev, error);
}
struct sysfs_device *wait_devices_device_open(const char *path)
{
struct sysfs_device *devices_dev;
int loop;
loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
while (--loop) {
devices_dev = sysfs_open_device_path(path);
if (devices_dev)
break;
usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
}
return(devices_dev);
}
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