Add control daemon for CPU governor and display brightness

This allows kpowersave-nohal to function properly as a normal user

4 files changed, 406 insertions, 0 deletions

diff --git a/tdecore/hwlibdaemons/dbus/CMakeLists.txt b/tdecore/hwlibdaemons/dbus/CMakeLists.txt
new file mode 100644
index 000000000..4d1f4618a
--- /dev/null
+++ b/tdecore/hwlibdaemons/dbus/CMakeLists.txt
@@ -0,0 +1,37 @@
+#################################################
+#
+#  (C) 2012 Timothy Pearson
+#  kb9vqf (AT) pearsoncomputing.net
+#
+#  Improvements and feedback are welcome
+#
+#  This file is released under GPL >= 2
+#
+#################################################
+
+include_directories(
+  ${DBUS_INCLUDE_DIRS}
+  ${CMAKE_CURRENT_BINARY_DIR}
+  ${CMAKE_BINARY_DIR}
+  ${CMAKE_CURRENT_SOURCE_DIR}
+)
+
+##### tde_dbus_hardwarecontrol ##################
+
+tde_add_executable( tde_dbus_hardwarecontrol
+  SOURCES tde_dbus_hardwarecontrol.c
+  LINK ${DBUS_LIBRARIES}
+  DESTINATION ${BIN_INSTALL_DIR}
+)
+
+##### other data ################################
+
+configure_file( org.trinitydesktop.hardwarecontrol.service.cmake org.trinitydesktop.hardwarecontrol.service @ONLY )
+
+install( FILES
+    org.trinitydesktop.hardwarecontrol.conf
+  DESTINATION ${DBUS_SYSTEM_CONF_DIRECTORY} )
+
+install( FILES
+    ${CMAKE_CURRENT_BINARY_DIR}/org.trinitydesktop.hardwarecontrol.service
+  DESTINATION ${DBUS_SERVICE_DIRECTORY} )
diff --git a/tdecore/hwlibdaemons/dbus/org.trinitydesktop.hardwarecontrol.conf b/tdecore/hwlibdaemons/dbus/org.trinitydesktop.hardwarecontrol.conf
new file mode 100644
index 000000000..a649b969f
--- /dev/null
+++ b/tdecore/hwlibdaemons/dbus/org.trinitydesktop.hardwarecontrol.conf
@@ -0,0 +1,38 @@
+<?xml version="1.0" encoding="UTF-8"?> <!-- -*- XML -*- -->
+
+<!DOCTYPE busconfig PUBLIC
+ "-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
+ "http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
+<busconfig>
+  <!-- Only root can own the service -->
+  <policy user="root">
+    <allow own="org.trinitydesktop.hardwarecontrol"/>
+  </policy>
+
+  <policy at_console="true">
+  <!-- Users with physical access to the machine are allowed access -->
+    <allow send_destination="org.trinitydesktop.hardwarecontrol"
+           send_interface="org.freedesktop.DBus.Introspectable"/>
+
+    <allow send_destination="org.trinitydesktop.hardwarecontrol"
+           send_interface="org.freedesktop.DBus.Properties"/>
+    <allow send_destination="org.trinitydesktop.hardwarecontrol.CPUGovernor"
+           send_interface="org.freedesktop.DBus.Properties"/>
+    <allow send_destination="org.trinitydesktop.hardwarecontrol.Brightness"
+           send_interface="org.freedesktop.DBus.Properties"/>
+
+    <allow send_destination="org.trinitydesktop.hardwarecontrol"
+           send_interface="org.trinitydesktop.hardwarecontrol"/>
+    <allow send_destination="org.trinitydesktop.hardwarecontrol"
+           send_interface="org.trinitydesktop.hardwarecontrol.CPUGovernor"/>
+    <allow send_destination="org.trinitydesktop.hardwarecontrol"
+           send_interface="org.trinitydesktop.hardwarecontrol.Brightness"/>
+  </policy>
+
+  <policy context="default">
+    <!-- Everyone else is denied access -->
+    <deny own="org.trinitydesktop.hardwarecontrol"/>
+
+    <deny send_destination="org.trinitydesktop.hardwarecontrol"/>
+  </policy>
+</busconfig>
diff --git a/tdecore/hwlibdaemons/dbus/org.trinitydesktop.hardwarecontrol.service.cmake b/tdecore/hwlibdaemons/dbus/org.trinitydesktop.hardwarecontrol.service.cmake
new file mode 100644
index 000000000..3be2ebeee
--- /dev/null
+++ b/tdecore/hwlibdaemons/dbus/org.trinitydesktop.hardwarecontrol.service.cmake
@@ -0,0 +1,4 @@
+[D-BUS Service]
+Name=org.trinitydesktop.hardwarecontrol
+Exec=@BIN_INSTALL_DIR@/tde_dbus_hardwarecontrol
+User=root
\ No newline at end of file
diff --git a/tdecore/hwlibdaemons/dbus/tde_dbus_hardwarecontrol.c b/tdecore/hwlibdaemons/dbus/tde_dbus_hardwarecontrol.c
new file mode 100644
index 000000000..f7e707522
--- /dev/null
+++ b/tdecore/hwlibdaemons/dbus/tde_dbus_hardwarecontrol.c
@@ -0,0 +1,327 @@
+#define DBUS_API_SUBJECT_TO_CHANGE
+#include <dbus/dbus.h>
+#include <stdbool.h>
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+void reply_Bool(DBusMessage* msg, DBusConnection* conn, int value) {
+	DBusMessage* reply;
+	DBusMessageIter args;
+	const char* member = dbus_message_get_member(msg);
+	dbus_uint32_t serial = 0;
+
+	// create a reply from the message
+	reply = dbus_message_new_method_return(msg);
+
+	// add the arguments to the reply
+	dbus_message_iter_init_append(reply, &args);
+	if (!dbus_message_iter_append_basic(&args, DBUS_TYPE_BOOLEAN, &value)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: dbus_message_iter_append_basic failed\n", member);
+		return;
+	}
+
+	// send the reply && flush the connection
+	if (!dbus_connection_send(conn, reply, &serial)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: dbus_connection_send failed\n", member);
+		return;
+	}
+	dbus_connection_flush(conn);
+
+	// free the reply
+	dbus_message_unref(reply);
+}
+
+void reply_CanSetGivenPath(DBusMessage* msg, DBusConnection* conn, const char* param) {
+	DBusMessage* reply;
+	DBusMessageIter args;
+	const char* member = dbus_message_get_member(msg);
+	dbus_uint32_t serial = 0;
+	int writable = false;
+
+	// check if path is writable
+	int rval = access (param, W_OK);
+	if (rval == 0) {
+		writable = true;
+	}
+
+	// create a reply from the message
+	reply = dbus_message_new_method_return(msg);
+
+	// add the arguments to the reply
+	dbus_message_iter_init_append(reply, &args);
+	if (!dbus_message_iter_append_basic(&args, DBUS_TYPE_BOOLEAN, &writable)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: dbus_message_iter_append_basic failed\n", member);
+		return;
+	}
+
+	// send the reply && flush the connection
+	if (!dbus_connection_send(conn, reply, &serial)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: dbus_connection_send failed\n", member);
+		return;
+	}
+	dbus_connection_flush(conn);
+
+	// free the reply
+	dbus_message_unref(reply);
+}
+
+void reply_SetGivenPath(DBusMessage* msg, DBusConnection* conn, const char* param, const char* contents) {
+	DBusMessage* reply;
+	DBusMessageIter args;
+	const char* member = dbus_message_get_member(msg);
+	dbus_uint32_t serial = 0;
+	int writable = false;
+	int written = false;
+
+	// check if path is writable
+	int rval = access (param, W_OK);
+	if (rval == 0) {
+		writable = true;
+	}
+
+	if (writable) {
+		FILE *node = fopen(param, "w");
+		if (node != NULL) {
+			if (fputs(contents, node) != EOF) {
+				written = true;
+			}
+			if (fclose(node) == EOF) {
+				// Error!
+			}
+		}
+	}
+
+	// create a reply from the message
+	reply = dbus_message_new_method_return(msg);
+
+	// add the arguments to the reply
+	dbus_message_iter_init_append(reply, &args);
+	if (!dbus_message_iter_append_basic(&args, DBUS_TYPE_BOOLEAN, &written)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: dbus_message_iter_append_basic failed\n", member);
+		return;
+	}
+
+	// send the reply && flush the connection
+	if (!dbus_connection_send(conn, reply, &serial)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: dbus_connection_send failed\n", member);
+		return;
+	}
+	dbus_connection_flush(conn);
+
+	// free the reply
+	dbus_message_unref(reply);
+}
+
+void reply_CanSetCPUGovernor(DBusMessage* msg, DBusConnection* conn) {
+	DBusMessageIter args;
+	const char* member = dbus_message_get_member(msg);
+	dbus_int32_t cpunum;
+	char path[256];
+
+	// read the arguments
+	if (!dbus_message_iter_init(msg, &args)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: no argument supplied\n", member);
+	}
+	else if (DBUS_TYPE_INT32 != dbus_message_iter_get_arg_type(&args)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: argument not 32-bit integer\n", member);
+	}
+	else {
+		dbus_message_iter_get_basic(&args, &cpunum);
+	}
+
+	snprintf(path, 256, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", cpunum);
+	reply_CanSetGivenPath(msg, conn, path);
+}
+
+void reply_SetCPUGovernor(DBusMessage* msg, DBusConnection* conn) {
+	DBusMessageIter args;
+	const char* member = dbus_message_get_member(msg);
+	dbus_int32_t cpunum = -1;
+	char* governor = NULL;
+	char path[256];
+
+	// read the arguments
+	if (!dbus_message_iter_init(msg, &args)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: no arguments supplied\n", member);
+	}
+	else if (DBUS_TYPE_INT32 != dbus_message_iter_get_arg_type(&args)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: first argument not 32-bit integer\n", member);
+	}
+	else {
+		dbus_message_iter_get_basic(&args, &cpunum);
+	}
+
+	if (!dbus_message_iter_next(&args)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: second argument not supplied\n", member);
+	}
+	else if (DBUS_TYPE_STRING != dbus_message_iter_get_arg_type(&args)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: second argument not string\n", member);
+	}
+	else {
+		dbus_message_iter_get_basic(&args, &governor);
+	}
+
+	snprintf(path, 256, "/sys/devices/system/cpu/cpu%d/cpufreq/scaling_governor", cpunum);
+	if ((cpunum>-1) && governor) {
+		reply_SetGivenPath(msg, conn, path, governor);
+	}
+	else {
+		reply_Bool(msg, conn, false);
+	}
+}
+
+void reply_CanSetBrightness(DBusMessage* msg, DBusConnection* conn) {
+	DBusMessageIter args;
+	const char* member = dbus_message_get_member(msg);
+	char* rawpath;
+	char* safepath;
+	char path[256];
+
+	// read the arguments
+	if (!dbus_message_iter_init(msg, &args)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: no argument supplied\n", member);
+	}
+	else if (DBUS_TYPE_STRING != dbus_message_iter_get_arg_type(&args)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: argument not string\n", member);
+	}
+	else {
+		dbus_message_iter_get_basic(&args, &rawpath);
+	}
+
+	safepath = realpath(rawpath, NULL);
+
+	if (safepath &&
+		(strstr(safepath, "/sys/devices") == safepath) &&
+		(strstr(safepath, "/brightness") == (safepath+strlen(safepath)-strlen("/brightness")))
+		) {
+			reply_CanSetGivenPath(msg, conn, safepath);
+	}
+	else {
+		reply_Bool(msg, conn, false);
+	}
+
+	free(safepath);
+}
+
+void reply_SetBrightness(DBusMessage* msg, DBusConnection* conn) {
+	DBusMessageIter args;
+	const char* member = dbus_message_get_member(msg);
+	char* rawpath;
+	char* safepath;
+	char* brightness;
+	char path[256];
+
+	// read the arguments
+	if (!dbus_message_iter_init(msg, &args)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: no arguments supplied\n", member);
+	}
+	else if (DBUS_TYPE_STRING != dbus_message_iter_get_arg_type(&args)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: first argument not string\n", member);
+	}
+	else {
+		dbus_message_iter_get_basic(&args, &rawpath);
+	}
+
+	if (!dbus_message_iter_next(&args)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: second argument not supplied\n", member);
+	}
+	else if (DBUS_TYPE_STRING != dbus_message_iter_get_arg_type(&args)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] %s: second argument not string\n", member);
+	}
+	else {
+		dbus_message_iter_get_basic(&args, &brightness);
+	}
+
+	safepath = realpath(rawpath, NULL);
+
+	if (safepath && brightness &&
+		(strstr(safepath, "/sys/devices") == safepath) &&
+		(strstr(safepath, "/brightness") == (safepath+strlen(safepath)-strlen("/brightness")))
+		) {
+			reply_SetGivenPath(msg, conn, safepath, brightness);
+	}
+	else {
+		reply_Bool(msg, conn, false);
+	}
+
+	free(safepath);
+}
+
+void listen() {
+	DBusMessage* msg;
+	DBusMessage* reply;
+	DBusMessageIter args;
+	DBusConnection* conn;
+	DBusError err;
+	int ret;
+	char* param;
+
+	fprintf(stderr, "[tde_dbus_hardwarecontrol] Listening...\n");
+
+	// initialise the error structure
+	dbus_error_init(&err);
+
+	// connect to the bus and check for errors
+	conn = dbus_bus_get(DBUS_BUS_SYSTEM, &err);
+	if (dbus_error_is_set(&err)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] Connection failed with error '%s'\n", err.message);
+		dbus_error_free(&err);
+	}
+	if (NULL == conn) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] No connection, exiting!\n");
+		exit(1);
+	}
+
+	// request our name on the bus and check for errors
+	ret = dbus_bus_request_name(conn, "org.trinitydesktop.hardwarecontrol", DBUS_NAME_FLAG_REPLACE_EXISTING , &err);
+	if (dbus_error_is_set(&err)) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] Name request failed with error '%s'\n", err.message);
+		dbus_error_free(&err);
+	}
+	if (DBUS_REQUEST_NAME_REPLY_PRIMARY_OWNER != ret) {
+		fprintf(stderr, "[tde_dbus_hardwarecontrol] Not primary owner (%d), exiting!\n", ret);
+		exit(1);
+	}
+
+	// loop, testing for new messages
+	while (true) {
+		// non blocking read of the next available message
+		dbus_connection_read_write(conn, 1000); // block for up to 1 second
+		msg = dbus_connection_pop_message(conn);
+	
+		// loop again if we haven't got a message
+		if (NULL == msg) {
+			continue;
+		}
+
+		// check this is a method call for the right interface & method
+		if (dbus_message_is_method_call(msg, "org.trinitydesktop.hardwarecontrol.CPUGovernor", "CanSetCPUGovernor")) {
+			reply_CanSetCPUGovernor(msg, conn);
+		}
+		else if (dbus_message_is_method_call(msg, "org.trinitydesktop.hardwarecontrol.CPUGovernor", "SetCPUGovernor")) {
+			reply_SetCPUGovernor(msg, conn);
+		}
+		else if (dbus_message_is_method_call(msg, "org.trinitydesktop.hardwarecontrol.Brightness", "CanSetBrightness")) {
+			reply_CanSetBrightness(msg, conn);
+		}
+		else if (dbus_message_is_method_call(msg, "org.trinitydesktop.hardwarecontrol.Brightness", "SetBrightness")) {
+			reply_SetBrightness(msg, conn);
+		}
+		else {
+			fprintf(stderr, "[tde_dbus_hardwarecontrol] Unknown method '%s' called on interface '%s', ignoring\n", dbus_message_get_member(msg), dbus_message_get_interface(msg));
+		}
+		
+		// free the message
+		dbus_message_unref(msg);
+	}
+
+	// close the connection
+	dbus_connection_close(conn);
+}
+
+int main(int argc, char** argv) {
+	listen();
+	return 0;
+}