What does a linux device need to be seen by Hal?

Posted by Jaime Soriano on Stack Overflow See other posts from Stack Overflow or by Jaime Soriano
Published on 2010-06-03T11:29:53Z Indexed on 2010/06/03 11:34 UTC
Read the original article Hit count: 270

Filed under:

linux-kernel

|

kernel-programming

|

linux-device-driver

|

hal

|

hotplugging

I'm trying to learn about device drivers on Linux Kernel, for that I've created three modules with:

A bus type
A device driver
A fake device that does nothing now, only is registered

Everything works fine, I can load the bus, the driver and the module that creates the device. Everything appears on sysfs, including the link between the device and the device driver that indicates that they are binded.

And when the driver and device are loaded, I can see using udevadm monitor that also some events are provoked:

KERNEL[1275564332.144997] add      /module/bustest_driver (module)
KERNEL[1275564332.145289] add      /bus/bustest/drivers/bustest_example (drivers)
UDEV  [1275564332.157428] add      /module/bustest_driver (module)
UDEV  [1275564332.157483] add      /bus/bustest/drivers/bustest_example (drivers)
KERNEL[1275564337.656650] add      /module/bustest_device (module)
KERNEL[1275564337.656817] add      /devices/bustest_device (bustest)
UDEV  [1275564337.658294] add      /module/bustest_device (module)
UDEV  [1275564337.664707] add      /devices/bustest_device (bustest)

But after everything, the device doesn't appear on hal. What else need a device to be seen by hal?

© Stack Overflow or respective owner

Related posts about linux-kernel

Out of disk space - /boot at 100%

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
My /boot is at 100%. When I run aptitude search ~ilinux-image I'm getting loads of unused images. When I try to delete one of them (after checking which one is currently in use by doing uname -r), e.g apt-get autoremove linux-image-3.2.0-44-generic I get: Reading package lists... Done Building dependency… >>> More
Linux Kernel Threads - scheduler

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi People, Is Linux Kernel scheduler a part of init process? My understanding is that it is part of Kernel threads managed internally not visible to user by either top or ps. Please correct my understanding. Is it possible to view standard kernel threads through any kernel debugger to see how standard… >>> More
Linux kernel scheduling

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, I wish to know how Old Linux scheduling algorithm SJF (shortest job first) calculates the process runtime ? >>> More
The newbie's guide to hacking the Linux kernel

as seen on Internet.com - Search for 'Internet.com'
<b>TuxRadar: </b>"We asked prolific kernel hacker (and Linux Format reader!) Greg Kroah-Hartman to tell us what it takes for newbies to patch the Linux kernel - here's what he had to say." >>> More
Google open source guru says Android code will be in Linux kernel in time

as seen on Internet.com - Search for 'Internet.com'
<b>ZDNet:</b> "Google’s Android code will assume its rightful place in the Linux kernel — in good time, the company’s top open source guru says." >>> More

Related posts about kernel-programming

How to start Android Kernel programming?

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi All, I am 6 months experience in Android, use to develop simple UI based application. Now i want to write application targeting the Android core Kernel.For example i want to develop a Framework which is not present in Android.To achieve that we have to write the code for the Kernel. I dont know… >>> More
Linux Kernel programming: trying to get vm_area_struct->vm_start crashes kernel

as seen on Stack Overflow - Search for 'Stack Overflow'
Hi, this is for an assignment at school, where I need to determine the size of the processes on the system using a system call. My code is as follows: ... struct task_struct *p; struct vm_area_struct *v; struct mm_struct *m; read_lock(&tasklist_lock); for_each_process(p) { printk("%ld\n"… >>> More
Linux Kernel Programming - Module 2 unable to get symbols exported by Module 1

as seen on Stack Overflow - Search for 'Stack Overflow'
I have a Linux kernel module M1 which exports a symbol S1. When I insmod M1.ko, I can see S1 in /proc/kallsyms. I use S1 in another kernel module M2. When I compile and insert module M2, I get message in dmesg saying "Unknown symbol in module S1". I am stumped. Can someone please tell me what is… >>> More
where to start linux kernel programming?

as seen on Stack Overflow - Search for 'Stack Overflow'
I have been programming in C for a couple of years in Linux. Now I want to work on linux kernel and contribute to kernel, if possible. I have been looking on the internet for the information about a starting point but I couldn't find one. So can any one please tell me where to begin? >>> More
Linux Kernel - Check if a file descriptor is taken

as seen on Stack Overflow - Search for 'Stack Overflow'
In linux kernel programming, is there a way to check if a particular file descriptor is in use for a given process or if it's available? >>> More