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[v2,08/12] platform/surface: aggregator: Add comment for KIP subsystem category

Message ID 20220527023447.2460025-9-luzmaximilian@gmail.com
State Accepted
Commit 25e2ca7301bd3ca5a63a6be41d729eb42202bc21
Headers show
Series platform/surface: aggregator: Add support for client hot-removal | expand

Commit Message

Maximilian Luz May 27, 2022, 2:34 a.m. UTC
The KIP subsystem (full name unknown, abbreviation has been obtained
through reverse engineering) handles detachable peripherals such as the
keyboard cover on the Surface Pro X and Surface Pro 8.

It is currently not entirely clear what this subsystem entails, but at
the very least it provides event notifications for when the keyboard
cover on the Surface Pro X and Surface Pro 8 have been detached or
re-attached, as well as the state that the keyboard cover is currently
in (e.g. folded-back, folded laptop-like, closed, etc.).

Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
---

Changes in v2:
  - none

---
 include/linux/surface_aggregator/serial_hub.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
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Patch

diff --git a/include/linux/surface_aggregator/serial_hub.h b/include/linux/surface_aggregator/serial_hub.h
index c3de43edcffa..26b95ec12733 100644
--- a/include/linux/surface_aggregator/serial_hub.h
+++ b/include/linux/surface_aggregator/serial_hub.h
@@ -306,7 +306,7 @@  enum ssam_ssh_tc {
 	SSAM_SSH_TC_LPC = 0x0b,
 	SSAM_SSH_TC_TCL = 0x0c,
 	SSAM_SSH_TC_SFL = 0x0d,
-	SSAM_SSH_TC_KIP = 0x0e,
+	SSAM_SSH_TC_KIP = 0x0e,	/* Manages detachable peripherals (Pro X/8 keyboard cover) */
 	SSAM_SSH_TC_EXT = 0x0f,
 	SSAM_SSH_TC_BLD = 0x10,
 	SSAM_SSH_TC_BAS = 0x11,	/* Detachment system (Surface Book 2/3). */