Hi, Hopefully some simple answers ;-) 1/ Normally your application would simply include the headers, the .c files would build seperately to produce the 'driver' (or kernel module in 'Linux speak'). You can build the kernel module outside of the kernel source tree but the code it builds cannot be linked to your user application due to the 'kernel space'/'user space' segmentation. The interface between user code and the kernel module is typically done by a device file which appears under /dev. You can use other methods such as virtual files under /proc which can be made read/write although it is normal for /proc files to be read only (for driver status for example). The header files would define 'ioctl' values that the driver and user code need as well as any other 'magic' numbers required for the driver to work. 2/ During development it helps a great deal to be able to build the driver as a module rather than 'built in'. You can rebuild just your module and remove and install the new module without a reboot. This will only be possible when the module reaches a certain level of stability so you can expect a few 'oopses' until you get there. I recommend you read the Linux Device Driver book, available here http://lwn.net/Kernel/LDD3. There are some simple examples of various types of driver to look at. Regards Phil Q Phil Quiney, Senior Software Engineer Trinity Convergence Cambridge Business Park Cowley Road Cambridge CB4 0WZ, UK T: +44(0)1223-435536 F: +44(0)1223-435560 www.trinityconvergence.com <http://www.trinityconvergence.com/>
________________________________ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of zhijin wang Sent: 05 June 2008 09:05 To: [email protected] Subject: i2c driver Hi, with my lack of linux driver development, I have some simple questions. 1.) assuming we get the i2c source code for the drive. i want to add the driver for linux. we just include the header file in the application or we must build the .c file with the application together? 2.) if we must build the source code, build it with linux kernel (rebuild the kernel for the driver) or build it with application code? THanks. Forest. ________________________________ 雅虎邮箱，您的终生邮箱！ <http://cn.mail.yahoo.com/>
_______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
