[PATCH] udev - program to query all device attributes to build a rule

[Kay Sievers <kay.sievers@vrfy.org>]

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Hi,
here is a small program to query all attributes of a device and
print these in the udev key format. It may help to get the keys to
define a rule.

thanks,
Kay


USB Flash Reader:

    kay@pim:~/src/udev.kay/extras/udevinfo$ ./udevinfo /sys/block/sda/sda3
    device '/sys/block/sda/sda3' has major:minor 8:3

    looking at class device '/sys/block/sda/sda3':
      SYSFS_dev="8:3"
      SYSFS_start="384"
      SYSFS_size="192"
      SYSFS_stat="       0        0        0        0"

    follow class device's "device" link '/sys/block/sda':
      BUS="scsi"
      ID="56:0:0:0"
      SYSFS_dev="8:0"
      SYSFS_range="16"
      SYSFS_size="31360"
      SYSFS_stat="      12        0       96       88        0        0 0        0        0       88       88"


Or the USB Webcam:

    kay@pim:~/src/udev.kay/extras/udevinfo$ ./udevinfo /sys/class/video4linux/video0/
    device '/sys/class/video4linux/video0' has major:minor 81:0

    looking at class device '/sys/class/video4linux/video0':
      SYSFS_dev="81:0"
      SYSFS_name="OV511 USB Camera"
      SYSFS_custom_id="21"
      SYSFS_model="Creative Labs WebCam 3"
      SYSFS_bridge="OV511+"
      SYSFS_sensor="OV7620"
      SYSFS_brightness="105"
      SYSFS_saturation="192"
      SYSFS_contrast="86"
      SYSFS_hue="128"
      SYSFS_exposure="0"

    follow class device's "device" link '/sys/class/video4linux/video0':
      BUS="usb"
      ID="1-1.2"
      SYSFS_dev="81:0"
      SYSFS_name="OV511 USB Camera"
      SYSFS_custom_id="21"
      SYSFS_model="Creative Labs WebCam 3"
      SYSFS_bridge="OV511+"
      SYSFS_sensor="OV7620"
      SYSFS_brightness="105"
      SYSFS_saturation="192"
      SYSFS_contrast="86"
      SYSFS_hue="128"
      SYSFS_exposure="0"


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diff -Nru a/extras/udevinfo/Makefile b/extras/udevinfo/Makefile
--- /dev/null	Wed Dec 31 16:00:00 1969
+++ b/extras/udevinfo/Makefile	Sun Jan 18 07:08:43 2004
@@ -0,0 +1,14 @@
+PROG=udevinfo
+LD=$(CC)
+OBJS=udevinfo.o
+
+all:	$(PROG)
+
+clean:
+	rm -f $(PROG) $(OBJS)
+
+$(PROG):	$(OBJS)
+	$(LD) $(LDFLAGS) -o $(PROG) $(CRT0) $(OBJS) $(SYSFS)
+
+me:
+	cd ../..; make EXTRAS=extras/udevinfo
diff -Nru a/extras/udevinfo/udevinfo.c b/extras/udevinfo/udevinfo.c
--- /dev/null	Wed Dec 31 16:00:00 1969
+++ b/extras/udevinfo/udevinfo.c	Sun Jan 18 07:08:43 2004
@@ -0,0 +1,133 @@
+/*
+ * udevinfo - fetches attributes for a device
+ *
+ * Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
+ *
+ *
+ *	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 <stdlib.h>
+#include <string.h>
+#include <stdio.h>
+
+#include "libsysfs.h"
+
+
+# define VALUE_SIZE 100
+
+char **main_argv;
+char **main_envp;
+
+static int print_all_attributes(char *path)
+{
+	struct dlist *attributes;
+	struct sysfs_attribute *attr;
+	struct sysfs_directory *sysfs_dir;
+	char value[VALUE_SIZE];
+	int len;
+	int retval = 0;
+
+	sysfs_dir = sysfs_open_directory(path);
+	if (sysfs_dir == NULL)
+		return -1;
+
+	attributes = sysfs_get_dir_attributes(sysfs_dir);
+	if (attributes == NULL) {
+		retval = -1;
+		goto exit;
+	}
+
+	dlist_for_each_data(attributes, attr, struct sysfs_attribute) {
+		if (attr->value != NULL) {
+			strncpy(value, attr->value, VALUE_SIZE);
+			len = strlen(value);
+			if (value[len-1] == '\n')
+				value[len-1] = '\0';
+			printf("  SYSFS_%s=\"%s\"\n", attr->name, value);
+		}
+	}
+	printf("\n");
+
+exit:
+	sysfs_close_directory(sysfs_dir);
+
+	return retval;
+}
+
+int main(int argc, char **argv, char **envp)
+{
+	main_argv = argv;
+	main_envp = envp;
+	struct sysfs_class_device *class_dev;
+	struct sysfs_class_device *class_dev_parent;
+	struct sysfs_attribute *attr;
+	struct sysfs_device *sysfs_device;
+	char *path;
+	int retval = 0;
+
+	if (argc != 2) {
+		printf("Usage: udevinfo <sysfs_device_path>\n");
+		return -1;
+	}
+	path = argv[1];
+
+	/*  get the class dev */
+	class_dev = sysfs_open_class_device_path(path);
+	if (class_dev == NULL) {
+		printf("couldn't get the class device\n");
+		return -1;
+	}
+
+	/* read the 'dev' file for major/minor*/
+	attr = sysfs_get_classdev_attr(class_dev, "dev");
+	if (attr == NULL) {
+		printf("couldn't get the \"dev\" file\n");
+		retval = -1;
+		goto exit;
+	}
+	printf("\ndevice '%s' has major:minor %s\n\n", class_dev->path, attr->value);
+	sysfs_close_attribute(attr);
+
+	/* open sysfs class device directory and print all attributes */
+	printf("looking at class device '%s':\n", class_dev->path);
+	if (print_all_attributes(class_dev->path) != 0) {
+		printf("couldn't open class device directory\n");
+		retval = -1;
+		goto exit;
+	}
+
+	/* get the device (if parent exists use it instead) */
+	class_dev_parent = sysfs_get_classdev_parent(class_dev);
+	if (class_dev_parent != NULL) {
+		//sysfs_close_class_device(class_dev);
+		class_dev = class_dev_parent;
+	}
+	sysfs_device = sysfs_get_classdev_device(class_dev);
+	if (sysfs_device != NULL) {
+		printf("follow class device's \"device\" link '%s':\n", class_dev->path);
+		printf("  BUS=\"%s\"\n", sysfs_device->bus);
+		printf("  ID=\"%s\"\n", sysfs_device->bus_id);
+
+		/* open sysfs device directory and print all attributes */
+		print_all_attributes(class_dev->path);
+
+		sysfs_close_device(sysfs_device);
+	}
+
+exit:
+	//sysfs_close_class_device(class_dev);
+	return retval;
+}