wait_for_sysfs problem · kernelthread

shyam

author

2005-01-04 08:23 UTC #0 lore raw

Hi,
This is my first port to the group. I have an exar modem Card for which I am supporting the driver for 2.6.x kernel. The driver which I use works fine with kernel 2.6.5 ( fedora core 2 ) distribution but does not work with kernel 2.6.9( fedora core 3 which I understand incorporates the udev feature.

Also I observe that the device which is in the pci slot has a symbolic link to the "serial" driver which is in /sys/bus/pci/drivers/serial. So i am concerned that this serial driver gets installed and registers with the device before my driver. Can i write a udev rule such that my driver gets loaded and gets the symbolic link to the device in the /sys/bus/pci/driver/<driver name>/ directory.

Now during the registration of the driver I get the following /var/log/message .

wait_for_sysfs[3794]: either wait_for_sysfs (udev039) needs an update to handle the device '/class/tty/cum25' properly ( class specific file unavailable) as the sysfs-support of your device driver needs to be fixed, please report to <[email protected]>.

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Kay Sievers

2005-01-04 15:38 UTC #1 lore raw

Quoted 6 lines · shyam

This is my first port to the group. I have an exar modem Card for which I am supporting the driver for 2.6.x kernel. The driver which I use works fine with kernel 2.6.5 ( fedora core 2 ) distribution but does not work with kernel 2.6.9( fedora core 3 which I understand incorporates the udev feature.

Quoted 7 lines

Now during the registration of the driver I get the following /var/log/message .
wait_for_sysfs[3794]: either wait_for_sysfs (udev039) needs an update to handle the device '/class/tty/cum25' properly ( class specific file unavailable) as the sysfs-support of your device driver needs to be fixed, please report to <[email protected]>.

Does your driver use the class driver core? Do you create a "dev" file in /sys in the class directory?

Kay

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shyam

author

2005-01-05 09:18 UTC #2 lore raw

In reply to shyam

Thanks Kay,
It would be nice if anybody could tell me how to create a "dev" file in
my /sys directory. I do create the nodes in the /dev directory. I find
some ttyMU{0-31} files in /sys/class/tty directory. They do have the same major number and minor number that I give in my make file but that is not the name that I give in the makefile. For example I give ttyMU1{a -h} in my make file which I update in the /dev directory. thanks once again,
shyam

Quoted 13 lines · Kay Sievers

Quoted 5 lines · shyam
Hi Kay,
I don't create a "dev" file in my /sys directory. How is that going to help. Please give me some pointers on that.
It is needed for udev to read the major/minor to be able to create the device node. Just look at any of the other class device drivers in the kernel.

Quoted 9 lines

If you need further information, please reply to the list on the original thread. Answers may be helpful for/from others too.
Good luck,
Kay

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Kay Sievers

2005-01-05 20:55 UTC #3 lore raw

In reply to shyam

Quoted 2 lines · shyam

It would be nice if anybody could tell me how to create a "dev" file in my /sys directory.

You may look at:
drivers/base/class_simple.c

how a simple version of class device is doing it, which is needed for udev to create the /dev node automatically for you. If you don't need to roll you own class registration, you may even just use the class_simple and it will do it for you.

Quoted 5 lines

I do create the nodes in the /dev directory. I find
some ttyMU{0-31} files in /sys/class/tty directory. They do have the same major number and minor number that I give in my make file but that is not the name that I give in the makefile. For example I give ttyMU1{a -h} in my make file which I update in the /dev directory.

Hard to guess, is the driver publicly available somewhere?

Kay

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shyam

author

2005-01-06 14:12 UTC #4 lore raw

In reply to shyam

I used the class_simple file to create a "dev" file in the /sys and I used the following functions
1)class_simple_create
2)class_simple_device_add
3)class_simple_device_remove.
Following are my observations-
a)I find my "dev" i.e. "modem" being created in /sys/class but the directory is empty. Is it that I need to make nodes inside this directory? b)Now should I make the nodes using mknod ?

While compiling the driver I *again* encountered the following message.

wait_for_sysfs[8956]: either wait_for_sysfs (udev 039) needs an update to handle the device '/class/tty/cum8' properly (class specific file unavailable) or the sysfs-support of your device's driver needs to be fixed, please report to <[email protected]>

Quoted 32 lines · Kay Sievers

Quoted 4 lines · shyam
It would be nice if anybody could tell me how to create a "dev" file in my /sys directory.
You may look at:
drivers/base/class_simple.c
how a simple version of class device is doing it, which is needed for udev to create the /dev node automatically for you. If you don't need to roll you own class registration, you may even just use the class_simple and it will do it for you.
Quoted 7 lines
I do create the nodes in the /dev directory. I find
some ttyMU{0-31} files in /sys/class/tty directory. They do have the same major number and minor number that I give in my make file but that is not the name that I give in the makefile. For example I give ttyMU1{a -h} in my make file which I update in the /dev directory.
Hard to guess, is the driver publicly available somewhere?
Kay

Quoted 11 lines

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shyam

author

2005-01-06 15:37 UTC #5 lore raw

In reply to shyam

Hi,
I forgot to mention that I use minicom to open my device which is configured in such a way that the node to be opened is in the /dev of the filesystem. Is that problem?
Thanks,
Shyam

Quoted 26 lines · Kay Sievers

Quoted 4 lines · shyam
It would be nice if anybody could tell me how to create a "dev" file in my /sys directory.
You may look at:
drivers/base/class_simple.c
how a simple version of class device is doing it, which is needed for udev to create the /dev node automatically for you. If you don't need to roll you own class registration, you may even just use the class_simple and it will do it for you.
Quoted 7 lines
I do create the nodes in the /dev directory. I find
some ttyMU{0-31} files in /sys/class/tty directory. They do have the same major number and minor number that I give in my make file but that is not the name that I give in the makefile. For example I give ttyMU1{a -h} in my make file which I update in the /dev directory.

Quoted 6 lines

Hard to guess, is the driver publicly available somewhere?
Kay

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Kay Sievers

2005-01-06 20:55 UTC #6 lore raw

In reply to shyam

Quoted 9 lines · shyam

I used the class_simple file to create a "dev" file in the /sys and I used the following functions
1)class_simple_create
2)class_simple_device_add
3)class_simple_device_remove.
Following are my observations-
a)I find my "dev" i.e. "modem" being created in /sys/class but the directory is empty. Is it that I need to make nodes inside this directory? b)Now should I make the nodes using mknod ?

I have no idea what's going on here. Is there a public place where we can get the driver to look at the sources?

Kay

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