Sir, i have completed read, write operation in character driver, using semaphore,ioctl. Also implementing kernel timer.
hello sir, I wanted to ask that how can we use Lables for calling a predefined kernel function from another function. For .eg.. ssize_t scull_write() { write: xyz; } ssize scull_read() { goto write; } this calling of the write … Continue reading
#ifndef _IOC_NONE # define _IOC_NONE 0U #endif #ifndef _IOC_WRITE # define _IOC_WRITE 1U #endif #ifndef _IOC_READ # define _IOC_READ 2U #endif please explain these lines of code>>!!
proper implementation of cdev_init and cdev_add for 25 nod done.
driver register and unregister with kernel perform using register_chrdev function and alloc_chrdev_region and unregister with unregister_chrdev_region . one issue faced: Instead of whole program execute successfully there is no output and after reboot it gives correct output.
Sir, I have implemeted the project of using multi thread in a single process then in multi process process for char driver by using sleep in the app.c for synchronization between multi thread for read,write,open,close in single process. Is it … Continue reading
Sir, I have implemented /proc file system successfully.
in case of append in character driver where we have to allocate new memory with continuation to the old memory (in lseek or write function)
Successfully Implemented the Compatibility mode(IEEE 1284-1994) On LED 8 array.
i have done tasklet in my device driver and it is working fine in driver…. Now working on workqueues……
In read_proc() fxn I am calling the timer fxn and in timer fxn I am using in_interrupt and in_atomic macros both are working fine….But when I call the timer fxn using for loop in read_proc, KERNEL crashes and display the bug … Continue reading
I have done following: Write operation for multiple quantums… Read operation for single quantum. Implemented Semaphore in read and write operation Now I am working on spinlocks and completions …………. ###NOTE ——– SPIN LOCKS are heavy weight mechanism/process than what … Continue reading
Sir , I want to know which touchpad driver has been there in my laptop , is it a generic driver which has been used for different laptops ?