Example makefile for linux device driver

PDF - Download linux-device-driver for free Previous Next This modified text is an extract of the original Stack Overflow Documentation created by following contributors and . A module may be built from one source file or several source files. In the case of one source file, the kbuild makefile simply adds the file to $ (obj-m). Example: #drivers/isdn/i4l/Makefile obj-$ (CONFIG_ISDN_PPP_BSDCOMP) += isdn_bsdcomp.o. Note: In this example $ (CONFIG_ISDN_PPP_BSDCOMP) evaluates to ‘m’.Estimated Reading Time: 10 mins.  · As can be seen from the example above, device-type information can be found using the ls command. The special character files are identified by the c character in the first column of the command output, and the block type by the character www.doorway.ru columns 5 and 6 of the result you can see the major, respectively the minor for each device. Certain major identifiers Estimated Reading Time: 7 mins.

To build a Linux driver, you need to have the kernel source (or, at least, the kernel headers) installed on your system. The kernel source is assumed to be installed at /usr/src/linux. If it’s at any other location on your system, specify the location in the KERNEL_SOURCE variable in this Makefile. 1. 2. static int device_file_major_number = 0; static const char device_name[] = "Simple-driver"; int register_device(void) { int result = 0; printk(KERN_NOTICE "Simple-driver: register_device() is called. "); result = register_chrdev(0, device_name, simple_driver_fops); if(result "Simple-driver: can\'t register character device with error code = %i ", result); return result; } device_file_major_number = result; printk(KERN_NOTICE "Simple-driver: registered. You can cross-compile the Linux device driver using the below command. sudo make ARCH=arm.

Here's an example of such a kernel module. /* We're doing kernel work */ #include And finally, the makefile. 5 Agu Compile and run. Driver compilation needs to use the kernel makefile file, that is, the source tree compilation system. Now have a look at linux/drivers/char/Makefile for a real world example. As you can see, some things get hardwired into the kernel (obj−y) but where are.