From 5cc98cf104c082dc2cea7670a75bb2298047868f Mon Sep 17 00:00:00 2001
From: Mark <alnyan@airmail.cc>
Date: Mon, 6 Jul 2020 21:58:19 +0300
Subject: [PATCH] Add acpi event output via char device

---
 arch/amd64/hw/acpi.c | 17 ++++++++++++++++-
 include/user/acpi.h  |  3 +++
 install-headers.sh   |  1 +
 3 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 include/user/acpi.h

diff --git a/arch/amd64/hw/acpi.c b/arch/amd64/hw/acpi.c
index 1db4634..25993ed 100644
--- a/arch/amd64/hw/acpi.c
+++ b/arch/amd64/hw/acpi.c
@@ -1,15 +1,27 @@
 #include "arch/amd64/hw/acpi.h"
 #include "arch/amd64/hw/apic.h"
 #include "arch/amd64/hw/rtc.h"
+#include "sys/char/ring.h"
+#include "sys/char/line.h"
+#include "sys/char/chr.h"
 #include "sys/string.h"
 #include "sys/debug.h"
 #include "sys/panic.h"
+#include "user/acpi.h"
+#include "sys/dev.h"
 #include "acpi.h"
 
 struct acpi_madt *acpi_madt = NULL;
 struct acpi_fadt *acpi_fadt = NULL;
 struct acpi_mcfg *acpi_mcfg = NULL;
 
+static struct chrdev _acpi_event_dev = {
+    .dev_data = NULL,
+    .write = NULL,
+    .read = simple_line_read,
+    .ioctl = NULL
+};
+
 static uint8_t checksum(const void *ptr, size_t size) {
     uint8_t v = 0;
     for (size_t i = 0; i < size; ++i) {
@@ -19,7 +31,7 @@ static uint8_t checksum(const void *ptr, size_t size) {
 }
 
 static uint32_t acpi_power_button_handler(void *ctx) {
-    kinfo("Power button was pressed\n");
+    ring_putc(NULL, &_acpi_event_dev.buffer, ACEV_POWER_BUTTON, 0);
     return 0;
 }
 
@@ -161,4 +173,7 @@ void amd64_acpi_init(void) {
     if (ACPI_FAILURE(acpica_init())) {
         panic("Failed to initialize ACPICA\n");
     }
+
+    ring_init(&_acpi_event_dev.buffer, 16);
+    dev_add(DEV_CLASS_CHAR, 0, &_acpi_event_dev, "acpi");
 }
diff --git a/include/user/acpi.h b/include/user/acpi.h
new file mode 100644
index 0000000..0cb4df2
--- /dev/null
+++ b/include/user/acpi.h
@@ -0,0 +1,3 @@
+#pragma once
+
+#define ACEV_POWER_BUTTON           ((char) 'A')
diff --git a/install-headers.sh b/install-headers.sh
index b6264b2..2fc6aa2 100755
--- a/install-headers.sh
+++ b/install-headers.sh
@@ -26,6 +26,7 @@ KERNEL_HEADERS="include/user/fcntl.h \
                 include/user/video.h \
                 include/user/select.h \
                 include/user/module.h \
+                include/user/acpi.h \
                 include/user/reboot.h"
 
 for src_file in $KERNEL_HEADERS; do