wacom linux drivers

It may be difficult to put the driver model in the first chapter, but as long as the driver model can be crossed, it will be much easier later. The driver model is the cornerstone of the entire Linux Device Driver. Most people call the driver model a device model, but I have checked the help document of Linux to find the driver-model directory in the documentation directory under the download source code pa

Description of Linux driver in my graphics card manual-Linux general technology-Linux technology and application information. For details, see the following. Why is there no Linux driver included in the ATI series drivers? Answer: Because xFree86 has provided support for

Because of work needs, now we need to learn the Linux Device Driver. Starting from the simplest character device driver, we need to record our learning experience and stick to our own ideas and conclusions. The makefile I wrote for the first hello World character driver is as follows: # Kvers = $ (shell uname-R) Ifneq ($ (kernelrelease ),) OBJ-M + = hello_world.o Else Kerdir =/usr/src/linux-headers-3.2.0-

Basic conceptsBlock Devices (Blockdevice)---is a random access device with a certain structure, the reading and writing of this device is block -based, he uses buffer zone to hold temporary data, waiting for the condition to mature, from the cache once written to the device or from the device to read the buffer at once area.Character devices (Character device)---is a sequential data flow device in which read and write is performed by character , and these characters are continuously formed into

}};static struct Dm9000_plat_data Mini2440_dm9k_pdata = {The number of digits in the data line is 16 bits, and no e2prom is used. Flags = (Dm9000_platf_16bitonly | Dm9000_platf_no_eeprom),. dev_addr = {0x08,0x90,0x90,0x90,0x90,0x90},//mac address};static struct Platform_device Mini2440_device_eth = {. Name = "dm9000",//device name. id =-1,. num_resources = Array_size (Mini2440_dm9k_resource),. Resource = Mini2440_dm9k_resource,//Resources. Dev = {. Platform_data = mini2440_dm9k_pdata,//Private d

locks and semaphores take the form of "get lock-access critical section-release lock".*************************************************************************************************************** **********5. MutexThe mutex and the semaphore are basically the same. Not introduced.Summary: Concurrency and race are widespread, these mechanisms are a good way to solve the problem, interrupt masking is rarely used alone, atomic operations can only be done for integers, so the spin lock and signal

)definitionAmount of Completion:structcompletion com;2)Initialize:Init_completion (com);//If you feel this two-step trouble, you will be given a macro that defines and initializes the declare_completion (COM);3) WaitAmount of Completion:void__sched Wait_for_completion (structCompletion *x);//waiting for a completion to be awakenedint__sched wait_for_completion_interruptible (structCompletion *x);//interruptible wait_for_completionUnsignedLong__sched Wait_for_completion_timeout (structCompletion

Assuming that the transfer data between the hardware and the driver management is delayed for some reason, the driver author should implement buffering Data buffers help to separate the delivery and reception of data from the system call write and read, thereby improving the overall performance of the system A good buffering mechanism requires interrupt-driven I/O To properly interrupt-driven transmission data, the hardware should be able to generate interrupts acco

Linux device driver (Chinese version III) 2.6 kernel. pdf download[Date: 2011-09-27] Source: Linux Community Linux [font: Big Small]This book is the third edition of the classic "Linux device Driver". This version has been completely updated for the Linux kernel 2.6.10. This

kernel unsigned long copy_to_user (void __user *to, const void * from, unsigned long count) unsigned long copy_from_user (void *to, const void __user *from, unsigned long count); Any function that accesses user space must be reentrant, must be able to execute concurrently with other driver functions, and must be in a state that can legally hibernate Read method If the return value is equal to the count parameter for passing the read

Statement: the content of this blog is composedHttp://blog.csdn.net/droidphoneOriginal, reprinted please indicate the source, thank you! I. Overview ALSA is short for advanced Linux sound architecture and has become the mainstream audio architecture of Linux. I would like to learn more about ALSA's open-source project, for more information, see http://www.alsa-project.org /. In the driver layer of the in

This article from the csdn blog, reproduced please indicate the source: http://blog.csdn.net/z2007b/archive/2011/05/19/6432997.aspx //************************************** *************** Linux Kernel Lecture Hall (1) cornerstone Driver Model for device drivers (6) In the previous section, we roughly analyzed how driver_register works. Some details are not in place, but remember one sentence. The first th

Address: http://blog.csdn.net/droidphone/article/details/6271122 Statement: the content of this blog is composedHttp://blog.csdn.net/droidphoneOriginal, reprinted please indicate the source, thank you! I. Overview ALSA is short for advanced Linux sound architecture and has become the mainstream audio architecture of Linux. I would like to learn more about ALSA's open-source project, for more infor

based on the Sbull program in the Linux device driver book to Linux Block device driver summary analysis.Start by understanding the core data structures in this block device:struct Sbull_dev {int size; /* Device Size in sectors */U8 *data; /* The data array */Short users; /* How many users * *Short Media_change; /* Flag a media change? */spinlock_t lock; /* for mutual exclusion */struct Request_queue *queue