{"id":7530,"date":"2022-02-17T08:14:26","date_gmt":"2022-02-17T08:14:26","guid":{"rendered":"http:\/\/fastbitlab.com\/?p=7530"},"modified":"2023-09-13T16:06:27","modified_gmt":"2023-09-13T10:36:27","slug":"dynamically-allocating-char-device-numbers","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/dynamically-allocating-char-device-numbers\/","title":{"rendered":"Linux Device Driver Programming Lecture 29- Dynamically allocating char device numbers"},"content":{"rendered":"
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Dynamically allocating char device numbers<\/span><\/h1>\n
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In this article, let’s understand how to use alloc_chrdev_region() API to dynamically create and register a range of character device numbers.<\/span><\/p>\n

Purpose of alloc_chrdev_region()<\/code>:<\/strong><\/span><\/p>\n

alloc_chrdev_region()<\/code> is a kernel API used to dynamically create and register a range of character device numbers.<\/span><\/p>\n

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Figure 1. Dynamically register a range of char device numbers<\/span><\/figcaption><\/figure>\n

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This kernel API requires four input arguments. <\/span><\/span><\/p>\n

Input Parameters:<\/strong><\/span><\/code><\/p>\n