September 13-16, 2022
Dublin, Ireland + Virtual
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Thursday, September 15 • 14:05 - 14:45
Cameras, Devicetree and ACPI: A Device Driver Perspective - Sakari Ailus, Intel

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There are two classes of integrated camera hardware on the market today, USB cameras as well sets of hardware components such as raw image sensors, image signal processors (ISP), lens voice coil modules (VCM) that together can be used to implement a digital camera. USB cameras are self-contained and work with a single device driver but what about this other option? Its benefits compared to a USB camera include more choice in component selection, better control and better image quality. Traditionally found in mobile phones, during the past few years such cameras have found their way to laptops and tablets as well. There is also a downside: all the complexity of implementing a digital camera is exposed to the operating system. Each component requires a driver and most of these drivers require information on the system they're running on from the system firmware. Each component also requires low-level control from the operating systems. This presentation discusses DT and ACPI firmware interfaces in the scope of cameras, their differences as well as how device drivers interface with them.


Sakari Ailus

Software engineer, Intel
Sakari has been working on both Linux and cameras for around 15 years. Sakari maintains V4L2 camera sensor drivers as well as CSI-2 related drivers and is one of the V4L2 and Media Controller core developers.

Thursday September 15, 2022 14:05 - 14:45 IST
Liffey Hall 1 (Level 1)