From mboxrd@z Thu Jan  1 00:00:00 1970
From: Greg KH <greg@kroah.com>
Date: Fri, 23 Jan 2004 03:03:44 +0000
Subject: Re: [PATCH] udev - udevinfo with device chain walk
Message-Id: <20040123030344.GC16893@kroah.com>
List-Id: <linux-hotplug.vger.kernel.org>
References: <20040123013054.GA2437@vrfy.org>
In-Reply-To: <20040123013054.GA2437@vrfy.org>
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To: linux-hotplug@vger.kernel.org


Ananth, I think this is pointing out a bug in libsysfs, see below:

On Fri, Jan 23, 2004 at 02:30:54AM +0100, Kay Sievers wrote:
> udevinfo is now capable to print "all" attributes along the device chain
> of a sysfs device. Just like udev itself it walks the chain upwards and
> prints all usable attributes in the udev key format.
> So it should be easy to find unique attributes to compose a rule.
> 
> All multiline attribute values and values containing non printable
> characters are skipped now. I hope nothing useful gets lost with this :)
> 
> NOTE:
>   The BUS value corresponding with the attributes is printed for every
>   device. Don't specify BUS= in a rule and mix SYSFS_attributes from
>   different busses, the rule can't match.
> 
> thanks,
> Kay
> 
> 
> 
> ./udevinfo /sys/block/sda/sda1
> 
> device '/sys/block/sda/sda1' has major:minor 8:1
>   looking at class device '/sys/block/sda/sda1':
>     SYSFS_dev="8:1"
>     SYSFS_start="32"
>     SYSFS_size="160"
>     SYSFS_stat="       0        0        0        0"
> 
> follow the class device's "device"
>   looking at the device chain at '/sys/devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.3/1-1.3:1.0/host32/32:0:0:0':
>     BUS="scsi"
>     ID="32:0:0:0"
>     SYSFS_detach_state="0"
>     SYSFS_type="0"
>     SYSFS_model="USB 2 HS-CF"
>     SYSFS_vendor="SMSC    "
>     SYSFS_max_sectors="240"
>     SYSFS_device_blocked="0"
>     SYSFS_queue_depth="1"
>     SYSFS_scsi_level="3"
>     SYSFS_rev="1.25"
>     SYSFS_online="1"
> 
>   looking at the device chain at '/sys/devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.3/1-1.3:1.0/host32':
>     BUS=""
>     ID="host32"
>     SYSFS_detach_state="0"
> 
>   looking at the device chain at '/sys/devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.3/1-1.3:1.0':
>     BUS="usb"
>     ID="1-1.3:1.0"
>     SYSFS_detach_state="0"
>     SYSFS_bInterfaceNumber="00"
>     SYSFS_bAlternateSetting=" 0"
>     SYSFS_bNumEndpoints="02"
>     SYSFS_bInterfaceClass="08"
>     SYSFS_bInterfaceSubClass="06"
>     SYSFS_bInterfaceProtocol="50"
>     SYSFS_iInterface="00"
> 
>   looking at the device chain at '/sys/devices/pci0000:00/0000:00:1d.0/usb1/1-1/1-1.3':
>     BUS="usb"
>     ID="1-1.3"
>     SYSFS_detach_state="0"
>     SYSFS_bNumConfigurations="1"
>     SYSFS_bNumInterfaces=" 1"
>     SYSFS_bConfigurationValue="1"
>     SYSFS_bmAttributes="80"
>     SYSFS_bMaxPower=" 96mA"
>     SYSFS_idVendor="0424"
>     SYSFS_idProduct="20fc"
>     SYSFS_bcdDevice="0125"
>     SYSFS_bDeviceClass="00"
>     SYSFS_bDeviceSubClass="00"
>     SYSFS_bDeviceProtocol="00"
>     SYSFS_speed="12"
>     SYSFS_manufacturer="SMSC"
>     SYSFS_product="USB 2 Flash Media Device"
>     SYSFS_serial="0305037000C2"
> 
>   looking at the device chain at '/sys/devices/pci0000:00/0000:00:1d.0/usb1/1-1':
>     BUS="usb"
>     ID="1-1"
>     SYSFS_detach_state="0"
>     SYSFS_bNumConfigurations="1"
>     SYSFS_bNumInterfaces=" 1"
>     SYSFS_bConfigurationValue="1"
>     SYSFS_bmAttributes="e0"
>     SYSFS_bMaxPower=" 64mA"
>     SYSFS_idVendor="03eb"
>     SYSFS_idProduct="3301"
>     SYSFS_bcdDevice="0300"
>     SYSFS_bDeviceClass="09"
>     SYSFS_bDeviceSubClass="00"
>     SYSFS_bDeviceProtocol="00"
>     SYSFS_speed="12"
>     SYSFS_product="Standard USB Hub"
> 
>   looking at the device chain at '/sys/devices/pci0000:00/0000:00:1d.0/usb1':
>     BUS="usb"
>     ID="usb1"
>     SYSFS_detach_state="0"
>     SYSFS_bNumConfigurations="1"
>     SYSFS_bNumInterfaces=" 1"
>     SYSFS_bConfigurationValue="1"
>     SYSFS_bmAttributes="40"
>     SYSFS_bMaxPower="  0mA"
>     SYSFS_idVendor="0000"
>     SYSFS_idProduct="0000"
>     SYSFS_bcdDevice="0206"
>     SYSFS_bDeviceClass="09"
>     SYSFS_bDeviceSubClass="00"
>     SYSFS_bDeviceProtocol="00"
>     SYSFS_speed="12"
>     SYSFS_manufacturer="Linux 2.6.2-rc1-p4 uhci_hcd"
>     SYSFS_product="UHCI Host Controller"
>     SYSFS_serial="0000:00:1d.0"
> 
>   looking at the device chain at '/sys/devices/pci0000:00/0000:00:1d.0':
>     BUS="pci"
>     ID="0000:00:1d.0"
>     SYSFS_detach_state="0"
>     SYSFS_vendor="0x8086"
>     SYSFS_device="0x2482"
>     SYSFS_subsystem_vendor="0x1014"
>     SYSFS_subsystem_device="0x0220"
>     SYSFS_class="0x0c0300"
>     SYSFS_irq="9"
> 
>   looking at the device chain at '/sys/devices/pci0000:00':
>     BUS=""
>     ID="pci0000:00"
>     SYSFS_detach_state="0"

This device should show up on with BUS="pci", right?


thanks,

greg k-h


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