* Implemented APM generic syscall API to query the current power status.

* PowerStatus is now using this API when compiled for Haiku.
* Note, I'm not sure why yet, but running PowerStatus in the background
  crashes at least my laptop after some time.


git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21154 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/private/kernel/arch/x86/apm.h

@@ -47,6 +47,17 @@ typedef struct apm_info {
 } apm_info;
 
 
+// temporary generic syscall interface
+#define APM_SYSCALLS "apm"
+#define APM_GET_BATTERY_INFO	1
+
+struct battery_info {
+	bool	online;
+	int32	percent;
+	time_t	time_left;
+};
+
+
 #ifndef _BOOT_MODE
 #ifdef __cplusplus
 extern "C" {

src/apps/powerstatus/Jamfile

@@ -3,6 +3,7 @@ SubDir HAIKU_TOP src apps powerstatus ;
 SetSubDirSupportedPlatformsBeOSCompatible ;
 
 UsePrivateHeaders shared ;
+UseHeaders $(TARGET_PRIVATE_KERNEL_HEADERS) : true ;
 
 Application PowerStatus :
 	PowerStatusWindow.cpp

src/apps/powerstatus/PowerStatusView.cpp

@@ -10,6 +10,11 @@
 #include "PowerStatusView.h"
 #include "PowerStatus.h"
 
+#include <arch/x86/apm.h>
+#include <generic_syscall.h>
+#include <syscalls.h>
+	// temporary, as long as there is no real power state API
+
 #include <Alert.h>
 #include <Application.h>
 #include <Deskbar.h>
@@ -110,7 +115,19 @@ PowerStatusView::_Init()
 	fTimeLeft = 0;
 
 #ifdef HAIKU_TARGET_PLATFORM_HAIKU
-	// TODO: implement me
+	uint32 version = 0;
+	status_t status = _kern_generic_syscall(APM_SYSCALLS, B_SYSCALL_INFO,
+		&version, sizeof(version));
+	if (status == B_OK) {
+		battery_info info;
+		status = _kern_generic_syscall(APM_SYSCALLS, APM_GET_BATTERY_INFO, &info,
+			sizeof(battery_info));
+	}
+
+	if (status != B_OK) {
+		fprintf(stderr, "No power interface found.\n");
+		_Quit();
+	}
 #else
 	fDevice = open("/dev/misc/apm", O_RDONLY);
 	if (fDevice < 0) {
@@ -422,9 +439,14 @@ PowerStatusView::_Update(bool force)
 
 #ifdef HAIKU_TARGET_PLATFORM_HAIKU
 	// TODO: retrieve data from APM/ACPI kernel interface
-	fPercent = 42;
-	fTimeLeft = 1500;
-	fOnline = true;
+	battery_info info;
+	status_t status = _kern_generic_syscall(APM_SYSCALLS, APM_GET_BATTERY_INFO, &info,
+		sizeof(battery_info));
+	if (status == B_OK) {
+		fPercent = info.percent;
+		fTimeLeft = info.time_left;
+		fOnline = info.online;
+	}
 #else
 	if (fDevice < 0)
 		return;

src/system/kernel/arch/x86/apm.cpp

@@ -1,5 +1,5 @@
 /*
- * Copyright 2006, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
+ * Copyright 2006-2007, Axel Dörfler, axeld@pinc-software.de. All rights reserved.
  * Distributed under the terms of the MIT License.
  */
 
@@ -8,6 +8,7 @@
 
 #include <apm.h>
 #include <descriptors.h>
+#include <generic_syscall.h>
 #include <safemode.h>
 #include <boot/kernel_args.h>
 
@@ -196,6 +197,56 @@ apm_daemon(void *arg, int iteration)
 }
 
 
+static status_t
+get_battery_info(battery_info *info)
+{
+	bios_regs regs;
+	regs.eax = BIOS_APM_GET_POWER_STATUS;
+	regs.ebx = APM_ALL_DEVICES;
+	regs.ecx = 0;
+
+	status_t status = call_apm_bios(&regs);
+	if (status != B_OK)
+		return status;
+
+	uint16 lineStatus = (regs.ebx >> 8) & 0xff;
+	if (lineStatus == 0xff)
+		return B_NOT_SUPPORTED;
+
+	info->online = lineStatus != 0 && lineStatus != 2;
+	info->percent = regs.ecx & 0xff;
+	if (info->percent > 100 || info->percent < 0)
+		info->percent = -1;
+
+	info->time_left = info->percent >= 0 ? (int32)(regs.edx & 0xffff) : -1;
+	if (info->time_left & 0x8000)
+		info->time_left = (info->time_left & 0x7fff) * 60;
+
+	return B_OK;
+}
+
+
+static status_t
+apm_control(const char *subsystem, uint32 function,
+	void *buffer, size_t bufferSize)
+{
+	struct battery_info info;
+	if (bufferSize != sizeof(struct battery_info))
+		return B_BAD_VALUE;
+
+	switch (function) {
+		case APM_GET_BATTERY_INFO:
+			status_t status = get_battery_info(&info);
+			if (status < B_OK)
+				return status;
+
+			return user_memcpy(buffer, &info, sizeof(struct battery_info));
+	}
+
+	return B_BAD_VALUE;
+}
+
+
 //	#pragma mark -
 
 
@@ -304,6 +355,7 @@ apm_init(kernel_args *args)
 	register_kernel_daemon(apm_daemon, NULL, 10);
 		// run the daemon once every second
 
+	register_generic_syscall(APM_SYSCALLS, apm_control, 1, 0);
 	sAPMEnabled = true;
 	return B_OK;
 }