{"id":7612,"date":"2022-02-19T08:25:01","date_gmt":"2022-02-19T08:25:01","guid":{"rendered":"http:\/\/fastbitlab.com\/?p=7612"},"modified":"2023-09-13T17:01:10","modified_gmt":"2023-09-13T11:31:10","slug":"linux-device-driver-programming-lecture-32-character-device-registration-contd","status":"publish","type":"post","link":"https:\/\/fastbitlab.com\/blog\/linux-device-driver-programming-lecture-32-character-device-registration-contd\/","title":{"rendered":"Linux Device Driver Programming Lecture 32- Character device registration contd."},"content":{"rendered":"
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Character device registration contd.<\/b><\/span><\/h1>\n
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In the previous article, we completed cdev_init(). Now, we have to register our cdev structure with kernels VFS, that is, the virtual file system. That we do by cdev_add() as shown in Figure 1.<\/span><\/p>\n

\"Figure
Figure 1. Add a char device to the Kernel VFS<\/span><\/figcaption><\/figure>\n

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This is a registration. That was just initialization, and this is a real registration. <\/span><\/p>\n

The first parameter is the cdev structure, you have to mention pointer to your a cdev structure. <\/span><\/p>\n

And look at the second parameter. This is a device Number. We are registering a cdev structure with a device number. This device number you obtained in alloc_chrdev_region() that you need to mention here. <\/span><\/p>\n

And the third argument is number of consecutive minor numbers corresponding to this device.<\/span><\/p>\n

So, in our case, this would be one. Because there is only one device. We have got only one device, only one minor number. That’s why this should be 1 in our case.<\/span><\/p>\n

And after that, we’ll see more examples of how to use this a kernel API when we have a more than one minor numbers.<\/span><\/p>\n

 <\/p>\n

 Let’s add this function call in our driver (as shown in Figure 2).<\/span><\/span><\/p>\n

\"Figure
Figure 2. Register a device with VFS<\/span><\/figcaption><\/figure>\n

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The third step is to register the cdev structure with VFS. <\/span><\/p>\n

Basically, we call it as register a device. Our device is nothing but a cdev structure. cdev_add address of pcd_cdev. Second parameter is a device_number, device number. So, the minor number count is 1. We want to register one device, remember that. That’s why I’m using one here. <\/span><\/p>\n

Here we have done one mistake. Actually, you should not be doing this owner initialization here. Look at the cdev_init implementation (shown in Figure 3). Here, the first cdev structure is zeroed out, all the member elements are zeroed.<\/span><\/p>\n

\"Figure
Figure 3. cdev_init implementation<\/span><\/figcaption><\/figure>\n

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That means if you initialize any member element of the cdev, then it will be invalidated. That’s why we shouldn’t be doing a owner initialization during cdev_init.  <\/span>So, that’s why let’s remove this a code from initialize the cdev structure with fops and let’s put it here in register a device with VFS. Let’s save and exit, and it builds. So far, we have completed these two steps.<\/span><\/p>\n

In the upcoming article, let’s create the device files<\/a><\/span>. <\/span><\/p>\n

 <\/p>\n

FastBit Embedded Brain Academy Courses<\/b><\/span><\/p>\n

Click here: <\/span><\/span><\/span>https:\/\/fastbitlab.com\/course1<\/span><\/a><\/span><\/p>\n

 <\/p>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

  Character device registration contd.     In the previous article, we completed cdev_init(). Now, we have to register our cdev structure with kernels VFS, that is, the virtual file system. That we do by cdev_add() as shown in Figure 1.   This is a registration. That was just initialization, and this is a real […]<\/p>\n","protected":false},"author":1,"featured_media":7615,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"ocean_post_layout":"","ocean_both_sidebars_style":"","ocean_both_sidebars_content_width":0,"ocean_both_sidebars_sidebars_width":0,"ocean_sidebar":"0","ocean_second_sidebar":"0","ocean_disable_margins":"enable","ocean_add_body_class":"","ocean_shortcode_before_top_bar":"","ocean_shortcode_after_top_bar":"","ocean_shortcode_before_header":"","ocean_shortcode_after_header":"","ocean_has_shortcode":"","ocean_shortcode_after_title":"","ocean_shortcode_before_footer_widgets":"","ocean_shortcode_after_footer_widgets":"","ocean_shortcode_before_footer_bottom":"","ocean_shortcode_after_footer_bottom":"","ocean_display_top_bar":"default","ocean_display_header":"default","ocean_header_style":"","ocean_center_header_left_menu":"0","ocean_custom_header_template":"0","ocean_custom_logo":0,"ocean_custom_retina_logo":0,"ocean_custom_logo_max_width":0,"ocean_custom_logo_tablet_max_width":0,"ocean_custom_logo_mobile_max_width":0,"ocean_custom_logo_max_height":0,"ocean_custom_logo_tablet_max_height":0,"ocean_custom_logo_mobile_max_height":0,"ocean_header_custom_menu":"0","ocean_menu_typo_font_family":"0","ocean_menu_typo_font_subset":"","ocean_menu_typo_font_size":0,"ocean_menu_typo_font_size_tablet":0,"ocean_menu_typo_font_size_mobile":0,"ocean_menu_typo_font_size_unit":"px","ocean_menu_typo_font_weight":"","ocean_menu_typo_font_weight_tablet":"","ocean_menu_typo_font_weight_mobile":"","ocean_menu_typo_transform":"","ocean_menu_typo_transform_tablet":"","ocean_menu_typo_transform_mobile":"","ocean_menu_typo_line_height":0,"ocean_menu_typo_line_height_tablet":0,"ocean_menu_typo_line_height_mobile":0,"ocean_menu_typo_line_height_unit":"","ocean_menu_typo_spacing":0,"ocean_menu_typo_spacing_tablet":0,"ocean_menu_typo_spacing_mobile":0,"ocean_menu_typo_spacing_unit":"","ocean_menu_link_color":"","ocean_menu_link_color_hover":"","ocean_menu_link_color_active":"","ocean_menu_link_background":"","ocean_menu_link_hover_background":"","ocean_menu_link_active_background":"","ocean_menu_social_links_bg":"","ocean_menu_social_hover_links_bg":"","ocean_menu_social_links_color":"","ocean_menu_social_hover_links_color":"","ocean_disable_title":"default","ocean_disable_heading":"default","ocean_post_title":"","ocean_post_subheading":"","ocean_post_title_style":"","ocean_post_title_background_color":"","ocean_post_title_background":0,"ocean_post_title_bg_image_position":"","ocean_post_title_bg_image_attachment":"","ocean_post_title_bg_image_repeat":"","ocean_post_title_bg_image_size":"","ocean_post_title_height":0,"ocean_post_title_bg_overlay":0.5,"ocean_post_title_bg_overlay_color":"","ocean_disable_breadcrumbs":"default","ocean_breadcrumbs_color":"","ocean_breadcrumbs_separator_color":"","ocean_breadcrumbs_links_color":"","ocean_breadcrumbs_links_hover_color":"","ocean_display_footer_widgets":"default","ocean_display_footer_bottom":"default","ocean_custom_footer_template":"0","ocean_post_oembed":"","ocean_post_self_hosted_media":"","ocean_post_video_embed":"","ocean_link_format":"","ocean_link_format_target":"self","ocean_quote_format":"","ocean_quote_format_link":"post","ocean_gallery_link_images":"off","ocean_gallery_id":[],"footnotes":""},"categories":[8],"tags":[18],"class_list":["post-7612","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-linux-device-driver-programming","entry","has-media"],"yoast_head":"\nCharacter device registration| Linux Device Driver Programming<\/title>\n<meta name=\"description\" content=\"Learn how to register a character device in Linux with detailed instructions. 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