[thirdparty/systemd.git] / wait_for_sysfs.c

/*
 * wait_for_sysfs.c  - small program to delay the execution
 *		       of /etc/hotplug.d/ programs, until sysfs
 *		       is fully populated by the kernel. Depending on
 *		       the type of device, we wait for all expected
 *		       directories and then just exit.
 *
 * 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 "logging.h"
#include "udev_version.h"
#include "libsysfs/sysfs/libsysfs.h"

#ifndef FILENAME_MAX
#define FILENAME_MAX	4096
#endif

#ifdef LOG
unsigned char logname[LOGNAME_SIZE];
void log_message(int level, const char *format, ...)
{
	va_list args;

	va_start(args, format);
	vsyslog(level, format, args);
	va_end(args);
}
#endif

#define WAIT_MAX_SECONDS		5
#define WAIT_LOOP_PER_SECOND		20

/* wait for specific file to show up, normally the "dev"-file */
static int wait_for_class_device_attributes(struct sysfs_class_device *class_dev,
					    const char **error)
{
	static struct class_file {
		char *subsystem;
		char *file;
	} class_files[] = {
		{ .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 },
		{ NULL, NULL }
	};
	struct class_file *classfile;
	char *file = "dev";
	char filename[FILENAME_MAX];
	int loop;

	/* look if we want to look for another file instead of "dev" */
	for (classfile = class_files; classfile->subsystem != NULL; classfile++) {
		if (strcmp(class_dev->classname, classfile->subsystem) == 0) {
			if (classfile->file == NULL) {
				dbg("class '%s' has no file to wait for", class_dev->classname);
				return 0;
			}
			file = classfile->file;
			break;
		}
	}

	strcpy(filename, class_dev->path);
	strcat(filename, "/");
	strcat(filename, file);
	dbg("looking at class '%s' for specific file '%s' with full name %s", class_dev->classname, class_dev->path, 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);
	*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 struct class_device {
		char *subsystem;
		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 = "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 = "irda" },
		{ .subsystem = "net",		.device = "ppp" },
		{ .subsystem = "ppp",		.device = NULL },
		{ .subsystem = "sound",		.device = NULL },
		{ .subsystem = "printer",	.device = "lp" },
		{ .subsystem = "nvidia",	.device = NULL },
		{ .subsystem = "video4linux",	.device = "vbi" },
		{ .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 },
		{ NULL, NULL }
	};
	struct class_device *classdevice;
	int len;

	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 */
static int class_device_expect_no_bus(struct sysfs_class_device *class_dev)
{
	static char *devices_without_bus[] = {
		"scsi_host",
		"i2c-adapter",
		NULL
	};
	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 the bus and for a bus specific file to show up */
static int wait_for_bus_device(struct sysfs_device *devices_dev,
			       const char **error)
{
	static struct bus_file {
		char *bus;
		char *file;
	} bus_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 = "i2c",		.file = "detach_state" },
		{ NULL }
	};
	struct bus_file *busfile;
	int loop;

	/* 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");
		*error = "no bus device link";
		return -1;
	}
	dbg("bus device link found for bus '%s'", devices_dev->bus);

	/* wait for a bus specific file to show up */
	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
	while (--loop) {
		int found = 0;

		for (busfile = bus_files; busfile->bus != NULL; busfile++) {
			if (strcmp(devices_dev->bus, busfile->bus) == 0) {
				found = 1;
				dbg("looking at bus '%s' for specific file '%s'", devices_dev->bus, busfile->file);
				if (sysfs_get_device_attr(devices_dev, busfile->file) != NULL) {
					dbg("bus '%s' specific file '%s' found", devices_dev->bus, busfile->file);
					return 0;
				}
			}
		}
		if (found == 0) {
			*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 bus '%s' specific file '%s'", devices_dev->bus, busfile->file);
	*error = "bus specific file unavailable";
	return -1;
}


static struct sysfs_class_device *open_class_device(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);
}

static 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 -ENODEV;
	}

	/* 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");
		*error = "no device symlink";
		return -ENODEV;
	}
	dbg("device symlink found pointing to '%s'", devices_dev->path);

	/* wait for the bus value */
	if (class_device_expect_no_bus(class_dev)) {
		dbg("no bus device expected for '%s', ", class_dev->classname);
		return 0;
	} else {
		return wait_for_bus_device(devices_dev, error);
	}
}

static struct sysfs_device *open_devices_device(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);
}

int main(int argc, char *argv[], char *envp[])
{
	const char *devpath = "";
	const char *action;
	const char *subsystem;
	char sysfs_path[SYSFS_PATH_MAX];
	char filename[SYSFS_PATH_MAX];
	struct sysfs_class_device *class_dev;
	struct sysfs_device *devices_dev;
	int rc = 0;
	const char *error = NULL;

	init_logging("wait_for_sysfs");

	if (argc != 2) {
		dbg("error: subsystem");
		return 1;
	}
	subsystem = argv[1];

	devpath = getenv ("DEVPATH");
	if (!devpath) {
		dbg("error: no DEVPATH");
		rc = 1;
		goto exit;
	}

	action = getenv ("ACTION");
	if (!action) {
		dbg("error: no ACTION");
		rc = 1;
		goto exit;
	}

	/* we only wait on an add event */
	if (strcmp(action, "add") != 0) {
		dbg("no add ACTION");
		goto exit;
	}

	if (sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX) != 0) {
		dbg("error: no sysfs path");
		rc = 2;
		goto exit;
	}

	if ((strncmp(devpath, "/block/", 7) == 0) || (strncmp(devpath, "/class/", 7) == 0)) {
		snprintf(filename, SYSFS_PATH_MAX-1, "%s%s", sysfs_path, devpath);
		filename[SYSFS_PATH_MAX-1] = '\0';

		/* open the class device we are called for */
		class_dev = open_class_device(filename);
		if (!class_dev) {
			dbg("error: class device unavailable (probably remove has beaten us)");
			goto exit;
		}
		dbg("class device opened '%s'", filename);

		/* wait for the class device with possible physical device and bus */
		wait_for_class_device(class_dev, &error);

		sysfs_close_class_device(class_dev);

	} else if ((strncmp(devpath, "/devices/", 9) == 0)) {
		snprintf(filename, SYSFS_PATH_MAX-1, "%s%s", sysfs_path, devpath);
		filename[SYSFS_PATH_MAX-1] = '\0';

		/* open the path we are called for */
		devices_dev = open_devices_device(filename);
		if (!devices_dev) {
			dbg("error: devices device unavailable (probably remove has beaten us)");
			goto exit;
		}
		dbg("devices device opened '%s'", filename);

		/* wait for the bus value */
		wait_for_bus_device(devices_dev, &error);

		sysfs_close_device(devices_dev);

	} else {
		dbg("unhandled sysfs path, no need to wait");
	}

exit:
	if (error) {
		info("either wait_for_sysfs (udev %s) needs an update to handle the device '%s' "
		     "properly (%s) or the sysfs-support of your device's driver needs to be fixed, "
		     "please report to <linux-hotplug-devel@lists.sourceforge.net>",
		     UDEV_VERSION, devpath, error);
		rc =3;
	} else {
		dbg("result: waiting for sysfs successful '%s'", devpath);
	}

	exit(rc);
}
Commit	Line	Data
a8b5267a KS	1	/*
	2	* wait_for_sysfs.c - small program to delay the execution
	3	* of /etc/hotplug.d/ programs, until sysfs
e629ca3f	4	* is fully populated by the kernel. Depending on
a8b5267a KS	5	* the type of device, we wait for all expected
	6	* directories and then just exit.
	7	*
	8	* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
a8f2703a	9	* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
a8b5267a KS	10	*
	11	* This program is free software; you can redistribute it and/or modify it
	12	* under the terms of the GNU General Public License as published by the
	13	* Free Software Foundation version 2 of the License.
	14	*
	15	* This program is distributed in the hope that it will be useful, but
	16	* WITHOUT ANY WARRANTY; without even the implied warranty of
	17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	18	* General Public License for more details.
	19	*
	20	* You should have received a copy of the GNU General Public License along
	21	* with this program; if not, write to the Free Software Foundation, Inc.,
	22	* 675 Mass Ave, Cambridge, MA 02139, USA.
	23	*
	24	*/
	25
	26	#include <stdio.h>
	27	#include <stddef.h>
	28	#include <stdlib.h>
	29	#include <unistd.h>
	30	#include <string.h>
	31	#include <ctype.h>
	32	#include <errno.h>
	33	#include <sys/stat.h>
	34
	35	#include "logging.h"
cdd95f9a	36	#include "udev_version.h"
a8b5267a KS	37	#include "libsysfs/sysfs/libsysfs.h"
a8b5267a KS	38
a8f2703a GKH	39	#ifndef FILENAME_MAX
	40	#define FILENAME_MAX 4096
	41	#endif
	42
a8b5267a KS	43	#ifdef LOG
	44	unsigned char logname[LOGNAME_SIZE];
	45	void log_message(int level, const char *format, ...)
	46	{
	47	va_list args;
	48
	49	va_start(args, format);
	50	vsyslog(level, format, args);
	51	va_end(args);
	52	}
	53	#endif
	54
1946fec4	55	#define WAIT_MAX_SECONDS 5
a8b5267a KS	56	#define WAIT_LOOP_PER_SECOND 20
a8b5267a KS	57
e629ca3f	58	/* wait for specific file to show up, normally the "dev"-file */
dcb9c852 KS	59	static int wait_for_class_device_attributes(struct sysfs_class_device *class_dev,
dcb9c852 KS	60	const char **error)
a8b5267a KS	61	{
	62	static struct class_file {
	63	char *subsystem;
	64	char *file;
	65	} class_files[] = {
	66	{ .subsystem = "net", .file = "ifindex" },
e629ca3f KS	67	{ .subsystem = "scsi_host", .file = "unique_id" },
e629ca3f KS	68	{ .subsystem = "scsi_device", .file = NULL },
1946fec4	69	{ .subsystem = "pcmcia_socket", .file = "card_type" },
a8b5267a	70	{ .subsystem = "usb_host", .file = NULL },
90852564	71	{ .subsystem = "bluetooth", .file = "address" },
139087e8	72	{ .subsystem = "firmware", .file = "data" },
1a13fcb3	73	{ .subsystem = "i2c-adapter", .file = NULL },
10eb67ec	74	{ .subsystem = "pci_bus", .file = NULL },
83729077 GKH	75	{ .subsystem = "ieee1394", .file = NULL },
	76	{ .subsystem = "ieee1394_host", .file = NULL },
	77	{ .subsystem = "ieee1394_node", .file = NULL },
a8b5267a KS	78	{ NULL, NULL }
	79	};
	80	struct class_file *classfile;
dcb9c852	81	char *file = "dev";
a8f2703a	82	char filename[FILENAME_MAX];
a8b5267a KS	83	int loop;
	84
	85	/* look if we want to look for another file instead of "dev" */
	86	for (classfile = class_files; classfile->subsystem != NULL; classfile++) {
	87	if (strcmp(class_dev->classname, classfile->subsystem) == 0) {
	88	if (classfile->file == NULL) {
	89	dbg("class '%s' has no file to wait for", class_dev->classname);
	90	return 0;
	91	}
	92	file = classfile->file;
	93	break;
	94	}
	95	}
1946fec4	96
a8f2703a GKH	97	strcpy(filename, class_dev->path);
	98	strcat(filename, "/");
	99	strcat(filename, file);
	100	dbg("looking at class '%s' for specific file '%s' with full name %s", class_dev->classname, class_dev->path, filename);
a8b5267a KS	101
	102	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
	103	while (--loop) {
1946fec4 KS	104	struct stat stats;
1946fec4 KS	105
a8f2703a	106	if (stat(class_dev->path, &stats) == -1) {
dcb9c852	107	dbg("'%s' now disappeared (probably remove has beaten us)", class_dev->path);
a8f2703a GKH	108	return -ENODEV;
	109	}
	110
dcb9c852	111	if (stat(filename, &stats) == 0) {
a8b5267a KS	112	dbg("class '%s' specific file '%s' found", class_dev->classname, file);
	113	return 0;
	114	}
e629ca3f KS	115
e629ca3f KS	116	usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
a8b5267a KS	117	}
a8b5267a KS	118
e629ca3f	119	dbg("error: getting class '%s' specific file '%s'", class_dev->classname, file);
dcb9c852	120	*error = "class specific file unavailable";
a8f2703a	121	return -ENOENT;
a8b5267a KS	122	}
a8b5267a KS	123
7e89a569	124	/* check if we need to wait for a physical device */
a8b5267a KS	125	static int class_device_expect_no_device_link(struct sysfs_class_device *class_dev)
a8b5267a KS	126	{
7e89a569 KS	127	/* list of devices without a "device" symlink to the physical device
7e89a569 KS	128	* if device is set to NULL, no devices in that subsystem has a link */
b9b659ae GKH	129	static struct class_device {
	130	char *subsystem;
	131	char *device;
	132	} class_device[] = {
	133	{ .subsystem = "block", .device = "double" },
	134	{ .subsystem = "block", .device = "nb" },
	135	{ .subsystem = "block", .device = "ram" },
	136	{ .subsystem = "block", .device = "loop" },
	137	{ .subsystem = "block", .device = "fd" },
	138	{ .subsystem = "block", .device = "md" },
	139	{ .subsystem = "block", .device = "dos_cd" },
	140	{ .subsystem = "block", .device = "rflash" },
	141	{ .subsystem = "block", .device = "rom" },
	142	{ .subsystem = "block", .device = "rrom" },
	143	{ .subsystem = "block", .device = "flash" },
	144	{ .subsystem = "block", .device = "msd" },
	145	{ .subsystem = "block", .device = "sbpcd" },
	146	{ .subsystem = "block", .device = "pcd" },
	147	{ .subsystem = "block", .device = "pf" },
	148	{ .subsystem = "block", .device = "scd" },
	149	{ .subsystem = "block", .device = "ubd" },
	150	{ .subsystem = "input", .device = "event" },
	151	{ .subsystem = "input", .device = "mice" },
	152	{ .subsystem = "input", .device = "mouse" },
	153	{ .subsystem = "input", .device = "ts" },
10eb67ec	154	{ .subsystem = "vc", .device = NULL },
b9b659ae GKH	155	{ .subsystem = "tty", .device = NULL },
	156	{ .subsystem = "cpuid", .device = "cpu" },
	157	{ .subsystem = "graphics", .device = "fb" },
	158	{ .subsystem = "mem", .device = NULL },
	159	{ .subsystem = "misc", .device = NULL },
	160	{ .subsystem = "msr", .device = NULL },
	161	{ .subsystem = "netlink", .device = NULL },
cdd95f9a	162	{ .subsystem = "net", .device = "sit" },
cdd95f9a KS	163	{ .subsystem = "net", .device = "lo" },
cdd95f9a KS	164	{ .subsystem = "net", .device = "tap" },
d38c486a	165	{ .subsystem = "net", .device = "ipsec" },
139087e8	166	{ .subsystem = "net", .device = "irda" },
0f634c33 KS	167	{ .subsystem = "net", .device = "ppp" },
0f634c33 KS	168	{ .subsystem = "ppp", .device = NULL },
b9b659ae	169	{ .subsystem = "sound", .device = NULL },
b9b659ae	170	{ .subsystem = "printer", .device = "lp" },
10eb67ec	171	{ .subsystem = "nvidia", .device = NULL },
cdd95f9a	172	{ .subsystem = "video4linux", .device = "vbi" },
10eb67ec GKH	173	{ .subsystem = "lirc", .device = NULL },
	174	{ .subsystem = "firmware", .device = NULL },
	175	{ .subsystem = "drm", .device = NULL },
	176	{ .subsystem = "pci_bus", .device = NULL },
83729077 GKH	177	{ .subsystem = "ieee1394", .device = NULL },
	178	{ .subsystem = "ieee1394_host", .device = NULL },
	179	{ .subsystem = "ieee1394_node", .device = NULL },
2b29bb4f	180	{ .subsystem = "raw", .device = NULL },
b9b659ae	181	{ NULL, NULL }
a8b5267a	182	};
b9b659ae GKH	183	struct class_device *classdevice;
b9b659ae GKH	184	int len;
a8b5267a	185
b9b659ae GKH	186	for (classdevice = class_device; classdevice->subsystem != NULL; classdevice++) {
b9b659ae GKH	187	if (strcmp(class_dev->classname, classdevice->subsystem) == 0) {
7e89a569	188	/* see if no device in this class is expected to have a device-link */
b9b659ae GKH	189	if (classdevice->device == NULL)
b9b659ae GKH	190	return 1;
a8b5267a	191
b9b659ae	192	len = strlen(classdevice->device);
a8b5267a	193
b9b659ae GKH	194	/* see if device name matches */
	195	if (strncmp(class_dev->name, classdevice->device, len) != 0)
	196	continue;
a8b5267a	197
7e89a569	198	/* exact name match */
b9b659ae GKH	199	if (strlen(class_dev->name) == len)
	200	return 1;
	201
7e89a569	202	/* name match with instance number */
b9b659ae GKH	203	if (isdigit(class_dev->name[len]))
	204	return 1;
	205	}
a8b5267a KS	206	}
	207
	208	return 0;
	209	}
	210
e629ca3f KS	211	/* skip waiting for the bus */
	212	static int class_device_expect_no_bus(struct sysfs_class_device *class_dev)
	213	{
	214	static char *devices_without_bus[] = {
	215	"scsi_host",
1a13fcb3	216	"i2c-adapter",
e629ca3f KS	217	NULL
	218	};
	219	char **device;
	220
	221	for (device = devices_without_bus; *device != NULL; device++) {
	222	int len = strlen(*device);
	223
	224	if (strncmp(class_dev->classname, *device, len) == 0)
	225	return 1;
	226	}
	227
	228	return 0;
	229	}
	230
	231	/* wait for the bus and for a bus specific file to show up */
dcb9c852 KS	232	static int wait_for_bus_device(struct sysfs_device *devices_dev,
dcb9c852 KS	233	const char **error)
a8b5267a KS	234	{
	235	static struct bus_file {
	236	char *bus;
	237	char *file;
	238	} bus_files[] = {
	239	{ .bus = "scsi", .file = "vendor" },
	240	{ .bus = "usb", .file = "idVendor" },
	241	{ .bus = "usb", .file = "iInterface" },
e284ecba	242	{ .bus = "usb", .file = "bNumEndpoints" },
a8b5267a KS	243	{ .bus = "usb-serial", .file = "detach_state" },
	244	{ .bus = "ide", .file = "detach_state" },
	245	{ .bus = "pci", .file = "vendor" },
e629ca3f	246	{ .bus = "platform", .file = "detach_state" },
606397db	247	{ .bus = "i2c", .file = "detach_state" },
a8b5267a KS	248	{ NULL }
	249	};
	250	struct bus_file *busfile;
	251	int loop;
	252
dcb9c852	253	/* wait for the bus device link to the devices device */
a8b5267a KS	254	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
a8b5267a KS	255	while (--loop) {
dcb9c852	256	if (sysfs_get_device_bus(devices_dev) == 0)
a8b5267a KS	257	break;
	258
	259	usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
	260	}
	261	if (loop == 0) {
dcb9c852 KS	262	dbg("error: getting bus device link");
dcb9c852 KS	263	*error = "no bus device link";
a8b5267a KS	264	return -1;
a8b5267a KS	265	}
dcb9c852	266	dbg("bus device link found for bus '%s'", devices_dev->bus);
a8b5267a KS	267
	268	/* wait for a bus specific file to show up */
	269	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
	270	while (--loop) {
e629ca3f KS	271	int found = 0;
e629ca3f KS	272
a8b5267a	273	for (busfile = bus_files; busfile->bus != NULL; busfile++) {
dcb9c852	274	if (strcmp(devices_dev->bus, busfile->bus) == 0) {
e629ca3f	275	found = 1;
dcb9c852 KS	276	dbg("looking at bus '%s' for specific file '%s'", devices_dev->bus, busfile->file);
	277	if (sysfs_get_device_attr(devices_dev, busfile->file) != NULL) {
	278	dbg("bus '%s' specific file '%s' found", devices_dev->bus, busfile->file);
a8b5267a KS	279	return 0;
a8b5267a KS	280	}
a8b5267a KS	281	}
a8b5267a KS	282	}
e629ca3f	283	if (found == 0) {
dcb9c852	284	*error = "unknown bus";
e629ca3f	285	info("error: unknown bus, please report to "
dcb9c852	286	"<linux-hotplug-devel@lists.sourceforge.net> '%s'", devices_dev->bus);
e629ca3f KS	287	return -1;
	288	}
	289	usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
a8b5267a KS	290	}
a8b5267a KS	291
dcb9c852 KS	292	dbg("error: getting bus '%s' specific file '%s'", devices_dev->bus, busfile->file);
dcb9c852 KS	293	*error = "bus specific file unavailable";
a8b5267a KS	294	return -1;
	295	}
	296
dcb9c852 KS	297
	298	static struct sysfs_class_device open_class_device(const char path)
	299	{
	300	struct sysfs_class_device *class_dev;
	301	int loop;
	302
	303	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
	304	while (--loop) {
	305	class_dev = sysfs_open_class_device_path(path);
	306	if (class_dev)
	307	break;
	308
	309	usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
	310	}
	311
	312	return (class_dev);
	313	}
	314
	315	static int wait_for_class_device(struct sysfs_class_device *class_dev,
	316	const char **error)
	317	{
	318	struct sysfs_class_device *class_dev_parent;
	319	struct sysfs_device *devices_dev = NULL;
	320	int loop;
	321
	322	if (wait_for_class_device_attributes(class_dev, error) != 0)
	323	return -ENOENT;
	324
	325	/* skip devices without devices-link */
	326	if (class_device_expect_no_device_link(class_dev)) {
	327	dbg("no device symlink expected for '%s', ", class_dev->name);
	328	return -ENODEV;
	329	}
	330
	331	/* the symlink may be on the parent device */
	332	class_dev_parent = sysfs_get_classdev_parent(class_dev);
	333	if (class_dev_parent)
	334	dbg("looking at parent device for device link '%s'", class_dev_parent->path);
	335
	336	/* wait for the symlink to the devices device */
	337	dbg("waiting for symlink to devices device");
	338	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
	339	while (--loop) {
	340	if (class_dev_parent)
	341	devices_dev = sysfs_get_classdev_device(class_dev_parent);
	342	else
	343	devices_dev = sysfs_get_classdev_device(class_dev);
	344
	345	if (devices_dev)
	346	break;
	347
	348	usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
	349	}
	350	if (!devices_dev) {
	351	dbg(" error: no devices device symlink found");
	352	*error = "no device symlink";
	353	return -ENODEV;
	354	}
	355	dbg("device symlink found pointing to '%s'", devices_dev->path);
	356
	357	/* wait for the bus value */
	358	if (class_device_expect_no_bus(class_dev)) {
	359	dbg("no bus device expected for '%s', ", class_dev->classname);
	360	return 0;
361	} else {
362	return wait_for_bus_device(devices_dev, error);
363	}
364	}
365
366	static struct sysfs_device open_devices_device(const char path)
367	{
368	struct sysfs_device *devices_dev;
369	int loop;
370
371	loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
372	while (--loop) {
373	devices_dev = sysfs_open_device_path(path);
374	if (devices_dev)
375	break;
376
377	usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
378	}
379
380	return(devices_dev);
381	}
382
a8b5267a KS	383	int main(int argc, char argv[], char envp[])
	384	{
	385	const char *devpath = "";
	386	const char *action;
	387	const char *subsystem;
	388	char sysfs_path[SYSFS_PATH_MAX];
	389	char filename[SYSFS_PATH_MAX];
	390	struct sysfs_class_device *class_dev;
dcb9c852	391	struct sysfs_device *devices_dev;
a8b5267a	392	int rc = 0;
dcb9c852	393	const char *error = NULL;
a8b5267a	394
e629ca3f KS	395	init_logging("wait_for_sysfs");
e629ca3f KS	396
a8b5267a KS	397	if (argc != 2) {
	398	dbg("error: subsystem");
	399	return 1;
	400	}
	401	subsystem = argv[1];
	402
	403	devpath = getenv ("DEVPATH");
	404	if (!devpath) {
	405	dbg("error: no DEVPATH");
dcb9c852 KS	406	rc = 1;
dcb9c852 KS	407	goto exit;
a8b5267a KS	408	}
	409
	410	action = getenv ("ACTION");
	411	if (!action) {
	412	dbg("error: no ACTION");
dcb9c852 KS	413	rc = 1;
dcb9c852 KS	414	goto exit;
a8b5267a KS	415	}
a8b5267a KS	416
e629ca3f	417	/* we only wait on an add event */
dcb9c852 KS	418	if (strcmp(action, "add") != 0) {
	419	dbg("no add ACTION");
	420	goto exit;
	421	}
a8b5267a KS	422
	423	if (sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX) != 0) {
	424	dbg("error: no sysfs path");
dcb9c852 KS	425	rc = 2;
dcb9c852 KS	426	goto exit;
a8b5267a KS	427	}
	428
	429	if ((strncmp(devpath, "/block/", 7) == 0) \|\| (strncmp(devpath, "/class/", 7) == 0)) {
a8b5267a KS	430	snprintf(filename, SYSFS_PATH_MAX-1, "%s%s", sysfs_path, devpath);
	431	filename[SYSFS_PATH_MAX-1] = '\0';
	432
dcb9c852 KS	433	/* open the class device we are called for */
	434	class_dev = open_class_device(filename);
	435	if (!class_dev) {
	436	dbg("error: class device unavailable (probably remove has beaten us)");
a8b5267a KS	437	goto exit;
a8b5267a KS	438	}
dcb9c852	439	dbg("class device opened '%s'", filename);
a8b5267a	440
dcb9c852 KS	441	/* wait for the class device with possible physical device and bus */
dcb9c852 KS	442	wait_for_class_device(class_dev, &error);
a8b5267a	443
e629ca3f	444	sysfs_close_class_device(class_dev);
a8b5267a KS	445
a8b5267a KS	446	} else if ((strncmp(devpath, "/devices/", 9) == 0)) {
a8b5267a KS	447	snprintf(filename, SYSFS_PATH_MAX-1, "%s%s", sysfs_path, devpath);
	448	filename[SYSFS_PATH_MAX-1] = '\0';
	449
dcb9c852 KS	450	/* open the path we are called for */
	451	devices_dev = open_devices_device(filename);
	452	if (!devices_dev) {
	453	dbg("error: devices device unavailable (probably remove has beaten us)");
a8b5267a KS	454	goto exit;
a8b5267a KS	455	}
dcb9c852	456	dbg("devices device opened '%s'", filename);
a8b5267a KS	457
a8b5267a KS	458	/* wait for the bus value */
dcb9c852	459	wait_for_bus_device(devices_dev, &error);
a8b5267a	460
dcb9c852	461	sysfs_close_device(devices_dev);
a8b5267a	462
a8b5267a KS	463	} else {
	464	dbg("unhandled sysfs path, no need to wait");
	465	}
	466
	467	exit:
dcb9c852	468	if (error) {
cdd95f9a	469	info("either wait_for_sysfs (udev %s) needs an update to handle the device '%s' "
dcb9c852	470	"properly (%s) or the sysfs-support of your device's driver needs to be fixed, "
cdd95f9a	471	"please report to <linux-hotplug-devel@lists.sourceforge.net>",
dcb9c852 KS	472	UDEV_VERSION, devpath, error);
	473	rc =3;
	474	} else {
	475	dbg("result: waiting for sysfs successful '%s'", devpath);
	476	}
a8b5267a	477
dcb9c852	478	exit(rc);
a8b5267a	479	}