When to best implement a I2C driver module in Linux

Posted by stefangachter on Stack Overflow See other posts from Stack Overflow or by stefangachter
Published on 2010-04-13T13:24:07Z Indexed on 2010/06/18 1:03 UTC
Read the original article Hit count: 322

Filed under:

linux-device-driver

|

i2c

I am currently dealing with two devices connected to the I2C bus within an embedded system running Linux. I am using an exisiting driver for the first device, a camera. For the second device, I have successfully implemented a userspace program with which I can communicate with the second device. So far, both devices seem to coexist happily. However, almost all I2C devices have their own driver module. Thus, I am wondering what the advantages of a driver module are. I had a look at the following thread...

http://stackoverflow.com/questions/149032/when-should-i-write-a-linux-kernel-module

... but without conclusion.

Thus, what would be the advantage of writing a I2C driver module over a userspace implementation?

Regards, Stefan

© Stack Overflow or respective owner

Related posts about linux-device-driver

Linux Device Driver: Symbol "memcpy" not found

as seen on Stack Overflow - Search for 'Stack Overflow'
Hello, I'm trying to write a Linux device driver. I've got it to work really well, until I tried to use "memcpy". I don't even get a compiler error, when I "make" it just warns me: WARNING: "memcpy" [/root/homedir/sv/main.ko] undefined! OK and when I try to load via insmod, I get on the console: insmod:… >>> More
Linux Device Driver - what's wrong with my device_read()?

as seen on Stack Overflow - Search for 'Stack Overflow'
My device /dev/my_inc is meant to take a positive integer N represented as an ascii string, and store it. Any read from /dev/my_inc will produce the ascii string representation of N + 1. The problem is that when I cat /dev/my_inc, I only get the first byte of myinc_value output to my shell, even… >>> More
How to make an existing socket fail?

as seen on Stack Overflow - Search for 'Stack Overflow'
OK. So, this is exactly the opposite of what everyone asks about in network programming. Usually, people ask how to make a broken socket work. I, on the other hand am looking for the opposite. I currently have sockets working fine, and want them to break to re-create this problem we are seeing… >>> More
OSS4 on Debian Squeeze

as seen on Super User - Search for 'Super User'
Hi, I am trying to get OSS4 to work on a Debian Squeeze 64 bit machine with an usb sound adapter. There is no sound from this adapter at the present, although it worked just before on the previous installation. You can see the output of some commands here: $ sudo /etc/init.d/oss4-base restart Stopping… >>> More
Atheros LAN card driver, Linux compiling problem

as seen on Super User - Search for 'Super User'
I have installed openSUSE 11.4 to my new workstation. It says that there is Attansic ETHERNET controller on board. But no devices seen. I typed: lspci and it returned: atheros communications device 1083. I have downloaded drivers. I'm trying to compile the driver. But I get the error: **Makefile:94:… >>> More

Related posts about i2c

i2c on silicon image c8051f32x (using USBXpress)

as seen on Stack Overflow - Search for 'Stack Overflow'
I have the I2C (SMBus) working properly in this uC and have a VB GUI which can communicate over USB (using USBXpress) and do I2C transactions from the uC to a separate IC. The problem is that I am having the uC poll a register on the IC every 1s. When I do an asynchronous GUI I2C transaction, every… >>> More
Does Hauppauge WinTV HVR-900 (r2) [USB ID 2040:6502] work with ubuntu 12.04 LTS?

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I have this DVB+Analog usb tv tuner Hauppauge WinTV HVR-900 (r2) [USB ID 2040:6502]. This used to work under ubuntu 10.04 LTS. But in 12.04 there seems to be a problem. I have linux-firmware-nonfree and ivtv-utils installed. I am running Ubuntu 12.04.1 LTS 64 bit with all updates installed and the… >>> More
When to best implement a I2C driver module in Linux

as seen on Stack Overflow - Search for 'Stack Overflow'
I am currently dealing with two devices connected to the I2C bus within an embedded system running Linux. I am using an exisiting driver for the first device, a camera. For the second device, I have successfully implemented a userspace program with which I can communicate with the second device. So… >>> More
Wake up from sleep with GPIO (I2C)

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
My situation: Ubuntu 10.10 running on an atom driven main board the main board has a GPIO chip integrated (F75111 by Fintek). They communicate through I2C(SMBus). We have a driver running that works, we can send outputs and read inputs. Great! We would like to use the I/O interface to suspend… >>> More
lirc_zilog IR transmission no longer working with HD-PVR on 12.04

as seen on Ask Ubuntu - Search for 'Ask Ubuntu'
I have been running a ubuntu 10.04 with a patched version of lirc_zilog for two years. I upgraded to 12.04 and lirc_zilog is no longer working with my HD-PVR. The MythTV wiki reports that it did work out of the box with 11.04. The error message I get on irsend is as follows: johnf@carbon:~$ /usr/local/bin/irsend… >>> More