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