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authorTimothy Pearson <kb9vqf@pearsoncomputing.net>2013-01-18 22:38:16 -0600
committerTimothy Pearson <kb9vqf@pearsoncomputing.net>2013-01-18 22:38:16 -0600
commit54928e863500dda7674b5a6d425a77065095b6d3 (patch)
tree728c4bc62671724bd70cdf6f96a6838540b1cf79 /tdecore/hwlibdaemons
parent9af7bd1f0b11b37110f72e2fba0d75910d991270 (diff)
downloadtdelibs-54928e863500dda7674b5a6d425a77065095b6d3.tar.gz
tdelibs-54928e863500dda7674b5a6d425a77065095b6d3.zip
Add control daemon for CPU governor and display brightness
This allows kpowersave-nohal to function properly as a normal user
Diffstat (limited to 'tdecore/hwlibdaemons')
-rw-r--r--tdecore/hwlibdaemons/CMakeLists.txt13
-rw-r--r--tdecore/hwlibdaemons/dbus/CMakeLists.txt37
-rw-r--r--tdecore/hwlibdaemons/dbus/org.trinitydesktop.hardwarecontrol.conf38
-rw-r--r--tdecore/hwlibdaemons/dbus/org.trinitydesktop.hardwarecontrol.service.cmake4
-rw-r--r--tdecore/hwlibdaemons/dbus/tde_dbus_hardwarecontrol.c327
5 files changed, 419 insertions, 0 deletions
diff --git a/tdecore/hwlibdaemons/CMakeLists.txt b/tdecore/hwlibdaemons/CMakeLists.txt
new file mode 100644
index 000000000..edc853c95
--- /dev/null
+++ b/tdecore/hwlibdaemons/CMakeLists.txt
@@ -0,0 +1,13 @@
+#################################################
+#
+# (C) 2012 Timothy Pearson
+# kb9vqf (AT) pearsoncomputing.net
+#
+# Improvements and feedback are welcome
+#
+# This file is released under GPL >= 2
+#
+#################################################
+
+
+add_subdirectory( dbus )
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;
+}