Linux misc driver

Linda Johnson

May 15, 2025

6 min read

As a general rule yes: each major has .misc设备实例驱动通过 misc_register 向misc核心层注册misc设备，所有的misc的主设备号都是 (MISC_MAJOR)，misc核心为注册的misc设备维护一个双向链 . Create attribute: Store and Show functions. Therefore, device drivers designed for Linux may not work on other operating systems like Windows or . You can rely on this and use file->private_data in your file operations to obtain your custom structure, using container_of() macro.

User interfaces. Linux kernel source tree. MISC 驱动其实就是最简单的字符设备驱动，通常嵌套在 platform 总线驱动中，实现复杂的驱动。.

moxa-misc-driver

I want to know what is going wrong with the code.4k次。 杂项设备也是在嵌入式系统中用得比较多的一种设备驱动。miscdevice共享一个主设备号MISC_MAJOR(即10)，但次设备号不同。misc设备其实就是特殊的字符设备，主设备编号采用10，并且可自动生成设备节点。杂项设备作为字符设备的封装，为字符设备提供的简单的编程接口，如果编写 . Of course, your . 我认为，misc 驱动是最简单的 字符设备 驱动，内核封装了很多的接口，我们只需调用就可以了。 这里，我基于 前面文章的 reserved memory 模拟一个 .

Let's code a Linux Driver

So, as I said earlier, we need to open, read, write, and close the device file.

Miscellaneous Devices — The Linux Kernel documentation

The misc driver was designed for this purpose.第五十七章Linux MISC驱动实验.

Linux Device Driver Tutorial

int misc_register( struct miscdevice * misc) register a . Register a miscellaneous device with the kernel. We will focus on those operations in this tutorial.Register a miscellaneous device with the kernel.

Johannes4Linux/Linux

文章浏览阅读599次。Linux MISC驱动MISC驱动也叫杂项驱动，但是本质上就是一个字符设备驱动，通常嵌套在platform总线驱动中。MISC设备驱动的主设备号都为10，不同设备使用不同的从设备号，也就是说，这些不同的设备在设备树上的位置处于MISC设备节点的子节点的层次。

Linux MISC驱动示例

Create a directory in /sys.Elixir Cross Referencer - Explore source code in your browser - Particularly useful for the Linux kernel and other low-level projects in C/C++ (bootloaders, C libraries.

Pilotes et assistance

Miscellaneous Devices ¶. Please refer this URL for the complete tutorial of this example source code.看到這裏我們可以想象到，misc設備是對字符設備做了一個再次的封裝，而且，在misc設備中，主設備號都是一樣的，都是10，只有次設備號不同，當我們不知道內核中應該去分配那個此設備號時，可以直接給minor賦值為MISC_DYNAMIC_MINOR這個宏，意思就是由內核來幫我們分配次設備號。

正点原子Linux第五十七章Linux MISC驱动实验

文章浏览阅读1.rtk_btusb-objs := rtk_bt.

Major Number and Minor Number

文章浏览阅读421次。【demo】基于platform的misc driver文章目录【demo】基于platform的misc driver1 platform2 miscplatform是Linux内的一种虚拟总线，称为platform总线，包含platform_device设备和platform_driver驱动两个对象，用于将驱动和设备分开，实现内核分离的思想。一个成熟的字符设备驱动往往是把platform 跟字符注册 . However, it will access serial EEPROMs on any I2C adapter. Automate any workflow Packages. misc的意思是混合、杂项的，因此MISC驱动也叫做杂项驱动，也就是当我们板子上的某些外设无法进行分类的时候就可以使用MISC驱动。MISC驱动其实就是最简单的字符设备驱动，通常嵌套在platform总线驱动中，实现复杂的驱动，本章我 . If you are new to Linux and coming from the Windows or MacOS world, you'll be glad to know that Linux .Two approaches to finding drivers.

How to install a device driver on Linux

We already downloaded the “CyUSBSerial_SDK_Linux.

When your miscdevice is being open for the first time, miscdevice framework will set file->private_data to your struct miscdevice (see misc_open() function and also comment to misc_register() function).Increasingly, our cars will be controlled by a small number of powerful computers. The misc driver is registered as the driver for all device nodes with the corresponding major; it maintains a list of registered drivers. Create device file in driver and callbacks.This is the cdev structure and file operations of the character drivers tutorial – Linux Device Driver Tutorial Part 6.Moxa Misc Driver.Temps de Lecture Estimé: 40 secondes

Miscellaneous Devices — The Linux Kernel documentation

Misc strange devices#menu Misc devicesSee more on stackoverflowCommentairesMerci !Dites-nous en davantage Digital output data is formatted as 16-bit twos complement and is accessible through either a SPI (3- or 4- wire) or I2C digital interface. There's a new Linux distro on the scene today, and it's a bit specialized.6K views 10 months ago Let's code a Linux.Drivers don’t need open in fops for this.

Manquant :

Contribute to torvalds/linux development by creating an account on GitHub.流程图 Linux里面的misc杂项设备是主设备号为10的驱动设备，它的注册跟使用比较的简单，所以比较适用于功能简单 .Let's code a Linux Driver - 27: Misc device - The easy way to use device files in a LKM - YouTube. void misc_deregister(struct miscdevice *misc) ¶.0 of the Linux kernel. The Moxa misc driver supported to access the relay/DI/DO, on board uart interface and programable LED control on DA-720/DA-682B, DA-682B-K6 MC-1100, MC-7400, MP-2070/2120/2121, . The ADXL345 is a small, thin, ultra low power, 3-axis accelerometer with high resolution (13-bit) measurement up to ±16 g.28K subscribers. In the UNIX world there are two categories of . If the minor number is set to MISC_DYNAMIC_MINOR a minor number is assigned and placed in the minor field of the structure.

zip file, we checked the source codes of Linux SDK. 内核还能这么学：分析misc子系统与3+2+1设备 . 为什么选择 misc 驱动.

Manquant :

linux

Our customer asked about the Linux kernel driver (Linux kernel .In this repo you can find examples for: Simple Kernel Module.

It accesses the CY7C65211-24LTXIT over libusb library.Linux MISC驱动示例.This is a simple EEPROM module meant to enable reading the first 256 bytes of an EEPROM (on a SDRAM DIMM for example).misc_init函数分析 一些需要注意的细节部分 2. To declare an array parameter, use: Where, perm is the usual permissions value. Miscellaneous Devices.The device driver is a kernel component (usually a module) that interacts with a hardware device.Linux内核中提供了一套misc类设备驱动框架，所以我们写一个misc设备的驱动直接利用的是内核中提供的驱动框架来实现的；misc类设备驱动通常嵌套在platform 总线驱动中，配合总线驱动达到更复杂，多功能的效果。. And if possible, a single line of code that can implement the same . The structure passed is linked into the kernel and may not be destroyed until it has been unregistered. Text LCD Driver. The supported devices are generically called 24Cxx, and are listed above; however the numbering for these industry-standard devices may vary by manufacturer. A zero is returned on success and a negative errno code for failure. 所有的 MISC 设备驱动的主设备号都是 10，不同的设备使用不同的设备号。.c * * Generic misc open routine by Johan Myreen * * Based on . Array parameters, where the values are supplied as a comma-separated list, are also supported by the module loader. So now, let’s learn about the major and minor . Toggle navigation. In UNIX, Linux and similar operating . Drivers can export information independent of the physical device. 正因为简单，所以它通常嵌套在platform 总线驱动中，配合总线驱动达到更复杂，多功能的效果。. After we decompress the the *.

Linux misc设备（一）misc驱动框架

misc 的意思是混合、杂项的，因此 MISC 驱动也叫做杂项驱动，也就是当我们板子上的某些外设无法进行分类的时候就可以使用 MISC 驱动。. misc 意思是杂项，所以当板子上的某些外设无法进行分类的时候可以使用 misc 驱动，一般 misc 驱动嵌套在 platform 总线驱动。. The misc driver is registered as the driver for all device nodes with the corresponding major; it maintains a .Temps de Lecture Estimé: 7 min

Miscellaneous Character Drivers

int misc_register( struct miscdevice *misc) ¶. Now, a driver can be either compiled (to be integrated) into kernel image (zImage/bzImage

Solved: Does CY7C65211-24LTXIT support the Linux kernel dr

The ADXL345 is well suited for mobile device applications.In our previous tutorial, we discussed how to pass the argument to the Linux device driver during the load time.I am new to Linux kernel programming. À utiliser sur les systèmes . Sign in Product Actions.Each operating system requires its own set of device drivers to interact with hardware effectively.module_param_array () This macro is used to send the array as an argument to the Linux device driver.309 lines (267 loc) · 7. For other cases the minor number requested is used.o 通过make menuconfig 或者修改kernel 的配置文件，确认Realtek Bluetooth HCI USB driver 有支持。 make menuconfig [Networking support > Bluetooth subsystem support > Bluetooth device drivers] Figure 3-3 Realtek HCI USB driver support in make menuconfig /.

【IMX6ULL】Linux中的MISC设备驱动（搭配platform设备驱动）

misc类设备驱动框架和之前的LED设备驱动框架都是 .MISC设备驱动介绍.Linux kernel source tree.前言：misc子系统在Linux中是一个非常简单的子系统，但是其清晰的框架结构非常适合用来研究设备识别模型。本文从misc子系统的使用出发，通过了解其机制来总结一套的设备识别的驱动框架，即使用 使用同一个驱动，向. Skip to content.Linux中MISC驱动简介及其简单使用1、MISC 设备驱动简介2、一般操作流程1、定义以及填充结构体2、注册MISC 设备3、卸载MISC 设备 Linux里面的misc杂项设备是主设备号为10的驱动设备，它的注册跟使用比较的简单，所以比较适用于功能简单的设备。正因为简单，所以它通常嵌套在platform 总线驱动中，配合 . series embedded computer. Host and manage packages Security.