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applespi: Document ACPI methods #1

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Aug 10, 2016
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applespi: Document ACPI methods #1

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18 changes: 18 additions & 0 deletions applespi.c
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Original file line number Diff line number Diff line change
@@ -1,3 +1,21 @@
/**
* The keyboard and touchpad controller on the MacBook8,1, MacBook9,1 and
* MacBookPro12,1 can be driven either by USB or SPI. However the USB pins
* are only connected on the MacBookPro12,1, all others need this driver.
* The interface is selected using ACPI methods:
*
* * UIEN ("USB Interface Enable"): If invoked with argument 1, disables SPI
* and enables USB. If invoked with argument 0, disables USB.
* * UIST ("USB Interface Status"): Returns 1 if USB is enabled, 0 otherwise.
* * SIEN ("SPI Interface Enable"): If invoked with argument 1, disables USB
* and enables SPI. If invoked with argument 0, disables SPI.
* * SIST ("SPI Interface Status"): Returns 1 if SPI is enabled, 0 otherwise.
* * ISOL: Resets the four GPIO pins used for SPI. Intended to be invoked with
* argument 0, then once more with argument 1.
*
* UIEN and UIST are only provided on the MacBookPro12,1.
*/

#define pr_fmt(fmt) "applespi: " fmt

#include <linux/platform_device.h>
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