device driver stopped working

need to use I2c_new_device (). Its prototype is: struct i2c_client *I2c_new_device (struct i2c_adapter *adap, struct i2c_board_info const *info); This function will use the information provided by info to create a i2c_client and bind to the i2c_adapter that the first parameter points to. The returned parameter is a i2c_client pointer. The driver can communicate directly with the device using the i2c_client

Whether a device driver in a Linux system is properly installed is a few aspects of general inspection:1, System log. Embedded system is more direct DMESG, see there is no device keyword-related error information (universal system can check the/var/log/messages file).2. The loaded module. Check the module load list for modules with no associated devices.Lsmod3. L

Top half and bottom half In Linux, the interrupt processing routine is divided into two parts to solve this problem. The "top half" part is the actual interrupt response routine, that is, the Interrupt Routine registered with request_irq. The so-called "bottom half" is a scheduling by the top half, and the routine executed in a safer time later. The biggest difference between the top half processing routine and the bottom half processing routine is that when the bottom half processing routine is

/** * Author:hasen * Reference: Linux device Driver Development Details * Introduction: Android Small rookie Linux * device Driver Development Learning Journey * Topic: asynchronous I/O * date:2014-11-11 */The most commonly used input/output (I/O) model in Linux is synchronous I/O. In this model, when the requ

Execute PS-A | grep khubd on the terminal, and the khubd process is displayed. This is the hub daemon process. Our device is inserted into the USB interface (whether it is inserted with the hub, after the sub-hub), the daemon detects the issue and then notifies the master controller of the interruption. The master controller then calls the hub detection function to parse the device. After the hub

/******************************* Driver Templates* Version: V1* Usage method (in the last line mode):*:%s/xxx/"Your driver name"/g********************************/ #include #include #include # Include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #inc

architecture of Linux arm BSP has undergone earth-shaking changes. The device tree began to replace a large number of hardware-related trivial codes in a large number of board files, leading to dual-core and multi-core ARM chips, embedded virtualization technology enters the industry. These have injected a lot of source code into our 3rd version. The change in the arm arch architecture in the kernel stems from the well-known Linus, which claims that

, normally returns the number of file descriptors that satisfy the requirement.2, after Timeout wait, there is still no file to meet the requirements, the return value is 0.3, if Select is interrupted by a signal, it will return-1 and set errno to Eintr.4, if there is an error, return-1 and set the corresponding errno.Select-System call-using method: 1, the file to be monitored is added to the file descriptor set. 2, call Select to start monitoring. 3. Determine if the file has changed.Four m

Introduction to Linux device driver development (based on the latest 4.0 kernel) Linux never stops. Linus Torvalds, one of the greatest programmers in the world, founder of the Linux kernel, and Git creator, are still combining patches and upgrading the kernel day and night. As a technology, there has never been a shortcut, but it is a silly effort to sit on the bench. This is an era in which even reading