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8 embedded controller (EC) on Microsoft Surface devices. It has been originally
9 introduced on 4th generation devices (Surface Pro 4, Surface Book 1), but
17 Not much is currently known about SAM on 4th generation devices (Surface Pro
19 between host and EC (as detailed below). On 5th (Surface Pro 2017, Surface
24 host. On the Surface Book 2, specifically, it additionally provides an
26 display part from the keyboard part of the device), on the Surface Laptop 1
28 restructured for 7th generation devices and on those, specifically Surface
32 While features have not changed much on a coarse level since the 5th
33 generation, internal interfaces have undergone some rather large changes. On
37 requests. On 7th generation devices, this additional layer is gone and these
39 on newer generations, less devices are declared in ACPI, making them a bit
48 The type of communication interface between host and EC depends on the
49 generation of the Surface device. On 4th generation devices, host and EC
50 communicate via HID, specifically using a HID-over-I2C device, whereas on
52 device. In accordance to the drivers found on other operating systems, we
67 communication interface for SAM on 5th- and all later-generation Surface
68 devices. On the highest level, communication can be separated into two main