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[Translated] 20181115 How to install a device driver on Linux
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Translating by Jamskr
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How to install a device driver on Linux
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======
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Learn how Linux drivers work and how to use them.
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One of the most daunting challenges for people switching from a familiar Windows or MacOS system to Linux is installing and configuring a driver. This is understandable, as Windows and MacOS have mechanisms that make this process user-friendly. For example, when you plug in a new piece of hardware, Windows automatically detects it and shows a pop-up window asking if you want to continue with the driver's installation. You can also download a driver from the internet, then just double-click it to run a wizard or import the driver through Device Manager.
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This process isn't as easy on a Linux operating system. For one reason, Linux is an open source operating system, so there are [hundreds of Linux distribution variations][1] . This means it's impossible to create one how-to guide that works for all Linux distros. Each Linux operating system handles the driver installation process a different way.
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Second, most default Linux drivers are open source and integrated into the system, which makes installing any drivers that are not included quite complicated, even though most hardware devices can be automatically detected. Third, license policies vary among the different Linux distributions. For example, [Fedora prohibits][2] including drivers that are proprietary, legally encumbered, or that violate US laws. And Ubuntu asks users to [avoid using proprietary or closed hardware][3].
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To learn more about how Linux drivers work, I recommend reading [An Introduction to Device Drivers][4] in the book Linux Device Drivers.
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### Two approaches to finding drivers
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#### 1\. User interfaces
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If you are new to Linux and coming from the Windows or MacOS world, you'll be glad to know that Linux offers ways to see whether a driver is available through wizard-like programs. Ubuntu offers the [Additional Drivers][5] option. Other Linux distributions provide helper programs, like [Package Manager for GNOME][6], that you can check for available drivers.
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#### 2\. Command line
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What if you can't find a driver through your nice user interface application? Or you only have access through the shell with no graphic interface whatsoever? Maybe you've even decided to expand your skills by using a console. You have two options:
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A. **Use a repository**
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This is similar to the [**homebrew**][7] command in MacOS.** ** By using **yum** , **dnf** , **apt-get** , etc., you're basically adding a repository and updating the package cache.
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B. **Download, compile, and build it yourself**
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This usually involves downloading a package directly from a website or using the **wget** command and running the configuration file and Makefile to install it. This is beyond the scope of this article, but you should be able to find online guides if you choose to go this route.
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### Check if a driver is already installed
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Before jumping further into installing a driver in Linux, let's look at some commands that will determine whether the driver is already available on your system.
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The [**lspci**][8] command shows detailed information about all PCI buses and devices on the system:
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```
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$ lscpci
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```
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Or with **grep** :
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```
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$ lscpci | grep SOME_DRIVER_KEYWORD
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```
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For example, you can type **lspci | grep SAMSUNG** if you want to know if a Samsung driver is installed.
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The [**dmesg**][9] command shows all device drivers recognized by the kernel:
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```
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$ dmesg
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```
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Or with **grep** :
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```
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$ dmesg | grep SOME_DRIVER_KEYWORD
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```
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Any driver that's recognized will show in the results.
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If nothing is recognized by the **dmesg** or **lscpi** commands, try these two commands to see if the driver is at least loaded on the disk:
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```
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$ /sbin/lsmod
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```
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and
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```
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$ find /lib/modules
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```
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Tip: As with **lspci** or **dmesg** , append **| grep** to either command above to filter the results.
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If a driver is recognized by those commands but not by **lscpi** or **dmesg** , it means the driver is on the disk but not in the kernel. In this case, load the module with the **modprobe** command:
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```
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$ sudo modprobe MODULE_NAME
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```
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Run as this command as **sudo** since this module must be installed as a root user.
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### Add the repository and install
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There are different ways to add the repository through **yum** , **dnf** , and **apt-get** ; describing them all is beyond the scope of this article. To make it simple, this example will use **apt-get** , but the idea is similar for the other options.
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**1\. Delete the existing repository, if it exists.**
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```
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$ sudo apt-get purge NAME_OF_DRIVER*
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```
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where **NAME_OF_DRIVER** is the probable name of your driver. You can also add pattern match to your regular expression to filter further.
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**2\. Add the repository to the repolist, which should be specified in the driver guide.**
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```
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$ sudo add-apt-repository REPOLIST_OF_DRIVER
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```
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where **REPOLIST_OF_DRIVER** should be specified from the driver documentation (e.g., **epel-list** ).
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**3\. Update the repository list.**
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```
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$ sudo apt-get update
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```
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**4\. Install the package.**
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```
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$ sudo apt-get install NAME_OF_DRIVER
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```
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**5\. Check the installation.**
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Run the **lscpi** command (as above) to check that the driver was installed successfully.
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/18/11/how-install-device-driver-linux
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作者：[Bryant Son][a]
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选题：[lujun9972][b]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://opensource.com/users/brson
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[b]: https://github.com/lujun9972
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[1]: https://en.wikipedia.org/wiki/List_of_Linux_distributions
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[2]: https://fedoraproject.org/wiki/Forbidden_items?rd=ForbiddenItems
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[3]: https://www.ubuntu.com/licensing
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[4]: https://www.xml.com/ldd/chapter/book/ch01.html
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[5]: https://askubuntu.com/questions/47506/how-do-i-install-additional-drivers
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[6]: https://help.gnome.org/users/gnome-packagekit/stable/add-remove.html.en
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[7]: https://brew.sh/
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[8]: https://en.wikipedia.org/wiki/Lspci
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[9]: https://en.wikipedia.org/wiki/Dmesg
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如何在 Linux 上安装设备驱动程序
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======
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学习 Linux 设备驱动如何工作，并知道如何使用它们。
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对于一个熟悉 Windows 或者 MacOS 的人，想要切换到 Linux，它们都会面临一个艰巨的问题就是怎么安装和配置设备驱动。这是可以理解的，因为 Windows 和 MacOS 都有一套机制把这个过程做得非常的友好。比如说，当你插入一个新的硬件设备， Windows 能够自动检测并会弹出一个窗口询问你是否要继续驱动程序。你也可以从网络上下载驱动程序，仅仅需要双击解压或者是通过设备管理器导入驱动程序即可。
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而这在 Linux 操作系统上并非这么简单。第一个原因是， Linux 是一个开源的操作系统，所以有 [数百种 Linux 发行版的变体][1]。也就是说不可能做一个指南来适应所有的 Linux 发行版。因为每种 Linux 安装驱动程序的过程都有差异。
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第二，大多数默认的 Linux 驱动程序也都是开源的，并被集成到了系统中，这使得安装一些并未包含的驱动程序变得非常复杂，即使已经可以检测大多数的硬件设备。第三，不同发行版的许可也有差异。例如，[Fedora 禁止事项][2] 禁止包含专有的，受法律保护，或者是违反美国法律的驱动程序。而 Ubuntu 则让用户[避免使用受法律保护或闭源的硬件设备][3]。
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为了更好的学习 Linux 驱动程序是如何工作的，我建议阅读 Linux 设备驱动程序一书中的 [设备驱动程序简介][4]。
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### 两种方式来寻找驱动程序
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#### 1\. 用户界面
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如果是一个刚从 Windows 或 MacOS 转过来的 Linux 新手，那你会很高兴知道 Linux 也提供了一个通过向导式的程序来查看驱动程序是否可用的方法。 Ubuntu 提供了一个 [附加驱动程序][5] 选项。其它的 Linux 发行版也提供了帮助程序，像 [GNOME 的包管理器][6]，你可以使用它来检查驱动程序是否可用。
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#### 2\. 命令行
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如果你通过漂亮的用户界面找到驱动程序，那又该怎么办呢？或许你只能通过没有任何图形界面的 shell？甚至你可以使用控制台来展现你的技能。你有两个选择：
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A. **通过一个仓库**
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这和 MacOS 中的 [**homebrew**][7] 命令行很像。通过使用 `yum` , `dnf` , `apt-get` , 等等。你基本可以通过添加仓库，并更新包缓存。
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B. **下载, 编译, 然后自己构建**
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这通常包括直接从网络，或通过 `wget` 命令下载源码包，然后运行配置和编译、安装。这超出了本文的范围，但是你可以在网络上找到很多在线指南，如果你选择的是这条路的话。
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### 检查是否已经安装了这个驱动程序
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在进一步学习安装 Linux 驱动程序之前，让我们来学习几条命令，用来检测驱动程序是否已经在你的系统上可用。
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[`lspci`][8] 命令显示了系统上所有 PCI 总线和设备驱动程序的详细信息。
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```
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$ lscpci
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```
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或者使用 `grep`：
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```
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$ lscpci | grep SOME_DRIVER_KEYWORD
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```
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例如，你可以使用 `lspci | grep SAMSUNG` 命令，如果你想知道是否安装过三星的驱动。
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[`dmesg`][9] 命令显示了所有内核识别的驱动程序。
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```
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$ dmesg
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```
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或配合 `grep` 使用
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```
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$ dmesg | grep SOME_DRIVER_KEYWORD
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```
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任何识别到的驱动程序都会显示在结果中。
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如果通过 `dmesg` 或者 `lscpi` 命令没有识别到任何驱动程序，尝试下这两个命令，看看驱动程序至少是否加载到硬盘。
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```
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$ /sbin/lsmod
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```
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和
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```
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$ find /lib/modules
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```
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小贴士：和`lspci` 或 `dmesg` 一样，通过在上面的命令后面加上 `| grep` 来过滤结果。
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如果一个驱动程序已经被识别到了，但是通过 `lscpi` 或 `dmesg` 并没有找到，这意味着驱动程序已经存在于硬盘上，但是并没有加载到内核中，这种情况，你可以通过 `modprobe` 命令来加载这个模块。
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```
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$ sudo modprobe MODULE_NAME
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```
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使用 `sudo` 来运行这个命令，因为这个模块要使用 root 权限来安装。
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### 添加仓库并安装
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可以通过 `yum` , `dnf` , 和 `apt-get` 几种不同的方式来添加一个仓库；一个个介绍完它们并不在本文的范围。简单一点来说，这个示例将会使用 `apt-get` ，但是这个命令和其它的几个都是很类似的。
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**1\. 删除存在的仓库，如果它存在.**
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```
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$ sudo apt-get purge NAME_OF_DRIVER*
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```
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其中 `NAME_OF_DRIVER` 是你的驱动程序的可能的名称。你还可以将模式匹配加到正则表达式中来进一步过滤。
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**2\. 将仓库加入到仓库表中，这应该在驱动程序指南中有指定**
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```
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$ sudo add-apt-repository REPOLIST_OF_DRIVER
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```
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其中 `REPOLIST_OF_DRIVER` 应该从驱动文档中有指定（例如：`epel-list`）。
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**3\. 更新仓库列表。**
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```
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$ sudo apt-get update
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```
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**4\. 安装驱动程序。**
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```
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$ sudo apt-get install NAME_OF_DRIVER
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```
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**5\. 检查安装状态.**
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像上面说的一样，通过 `lscpi` 命令来检查驱动程序是否已经安装成功。
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/18/11/how-install-device-driver-linux
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作者：[Bryant Son][a]
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选题：[lujun9972][b]
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译者：[Jamskr](https://github.com/Jamskr)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://opensource.com/users/brson
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[b]: https://github.com/lujun9972
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[1]: https://en.wikipedia.org/wiki/List_of_Linux_distributions
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[2]: https://fedoraproject.org/wiki/Forbidden_items?rd=ForbiddenItems
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[3]: https://www.ubuntu.com/licensing
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[4]: https://www.xml.com/ldd/chapter/book/ch01.html
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[5]: https://askubuntu.com/questions/47506/how-do-i-install-additional-drivers
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[6]: https://help.gnome.org/users/gnome-packagekit/stable/add-remove.html.en
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[7]: https://brew.sh/
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[8]: https://en.wikipedia.org/wiki/Lspci
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[9]: https://en.wikipedia.org/wiki/Dmesg
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