Add "uinput" node type
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parent
e2ea8fed1e
commit
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2
Makefile
2
Makefile
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@ -12,7 +12,7 @@ CPPFLAGS += $(shell pkg-config --cflags $(DEPS))
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LDLIBS += $(shell pkg-config --libs $(DEPS))
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INTERP ?=
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MAIN = main
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OBJS = main.o events.o processing.o graph.o config.o event_code_names.o hash_table.o module_registry.o event_predicate.o nodes/getchar.o nodes/print.o nodes/evdev.o nodes/tee.o nodes/router.o nodes/modifiers.o nodes/modify_predicate.o
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OBJS = main.o events.o processing.o graph.o config.o event_code_names.o hash_table.o module_registry.o event_predicate.o nodes/getchar.o nodes/print.o nodes/evdev.o nodes/tee.o nodes/router.o nodes/modifiers.o nodes/modify_predicate.o nodes/uinput.o
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all: $(MAIN)
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13
config.cfg
13
config.cfg
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@ -102,6 +102,19 @@ nodes = {
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predicates = ["touch_held"];
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};
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};
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uinput_output = {
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type = "uinput";
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options = {
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name = "Resulting device";
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enabled_codes = (
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{major: "event_type.KEY"; minor: "button_event.LEFT"}
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,
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{major: "event_type.KEY"; minor: "button_event.RIGHT"}
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,
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{major: "event_type.ABS"; minor: "absolute_axis.X"; data: {minimum: 0; maximum: 3200; resolution: 0}}
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);
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};
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};
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};
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channels = ({
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@ -0,0 +1,177 @@
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#include <libevdev/libevdev-uinput.h>
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#include <stdio.h>
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#include <limits.h>
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#include <errno.h>
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#include "../graph.h"
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#include "../module_registry.h"
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typedef struct {
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GraphNode as_GraphNode;
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IOHandling subscription;
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struct libevdev *dev;
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struct libevdev_uinput *uidev;
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} UinputGraphNode;
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typedef struct {
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enum {
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CODESPECDATA_NONE,
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CODESPECDATA_INT,
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CODESPECDATA_ABSINFO,
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} which;
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union {
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struct input_absinfo as_absinfo;
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int as_int;
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};
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} CodeSpecData;
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inline static CodeSpecData
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load_code_spec_data(const config_setting_t * setting, InitializationEnvironment * env)
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{
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CodeSpecData data = {.which = CODESPECDATA_NONE, .as_absinfo = {0, 0, 0, 0, 0, 0}};
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if (!setting) {
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return data;
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}
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if (config_setting_type(setting) == CONFIG_TYPE_GROUP) {
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data.which = CODESPECDATA_ABSINFO;
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data.as_absinfo = (struct input_absinfo) {
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.value = (int) env_resolve_constant_or(env, config_setting_get_member(setting, "value"), 0),
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.minimum = (int) env_resolve_constant_or(env, config_setting_get_member(setting, "minimum"), INT_MIN),
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.maximum = (int) env_resolve_constant_or(env, config_setting_get_member(setting, "maximum"), INT_MAX),
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.fuzz = (int) env_resolve_constant_or(env, config_setting_get_member(setting, "fuzz"), 0),
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.flat = (int) env_resolve_constant_or(env, config_setting_get_member(setting, "flat"), 0),
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.resolution = (int) env_resolve_constant_or(env, config_setting_get_member(setting, "resolution"), 1),
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};
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} else if (config_setting_is_scalar(setting)) {
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data.which = CODESPECDATA_INT;
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data.as_int = (int) env_resolve_constant(env, setting);
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}
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return data;
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}
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static void
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load_enable_code(struct libevdev * dev, const config_setting_t * setting, InitializationEnvironment * env)
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{
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if (!setting) {
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return;
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}
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int type = (int) env_resolve_constant(env, config_setting_get_member(setting, "major"));
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int code = (int) env_resolve_constant(env, config_setting_get_member(setting, "minor"));
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CodeSpecData data = load_code_spec_data(config_setting_get_member(setting, "data"), env);
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const void *data_ptr = NULL;
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if (data.which == CODESPECDATA_INT) {
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data_ptr = &data.as_int;
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} else if (data.which == CODESPECDATA_ABSINFO) {
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data_ptr = &data.as_absinfo;
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}
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libevdev_enable_event_code(dev, type, code, data_ptr);
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}
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static bool
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handle_event(EventPositionBase * self, EventNode * event)
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{
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UinputGraphNode *node = DOWNCAST(UinputGraphNode, GraphNode, DOWNCAST(GraphNode, EventPositionBase, self));
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libevdev_uinput_write_event(node->uidev, (unsigned int) event->data.code.major, (unsigned int) event->data.code.minor, (int) event->data.payload);
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event_destroy(event);
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return true;
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}
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static GraphNode *
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create(GraphNodeSpecification * spec, GraphNodeConfig * config, InitializationEnvironment * env)
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{
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UinputGraphNode * node = T_ALLOC(1, UinputGraphNode);
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if (!node) {
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return NULL;
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}
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const char *name;
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config_setting_lookup_string(config->options, "name", &name);
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if (!name) {
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free(node);
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return NULL;
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}
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const config_setting_t *enabled_codes_setting = config_setting_get_member(config->options, "enabled_codes");
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if (!enabled_codes_setting) {
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free(node);
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return NULL;
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}
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struct libevdev *dev = libevdev_new();
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if (!dev) {
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free(node);
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return NULL;
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}
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libevdev_set_name(dev, name);
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size_t codes_length = config_setting_length(enabled_codes_setting);
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for (size_t i = 0; i < codes_length; ++i) {
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load_enable_code(dev, config_setting_get_elem(enabled_codes_setting, i), env);
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}
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struct libevdev_uinput *uidev;
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int err;
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if ((err = libevdev_uinput_create_from_device(dev, LIBEVDEV_UINPUT_OPEN_MANAGED, &uidev) != 0)) {
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libevdev_free(dev);
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free(node);
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if (err < 0) {
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errno = -err;
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}
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return NULL;
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}
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*node = (UinputGraphNode) {
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.as_GraphNode = {
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.as_EventPositionBase = {
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.handle_event = &handle_event,
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.waiting_new_event = false,
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},
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.specification = spec,
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.inputs = EMPTY_GRAPH_CHANNEL_LIST,
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.outputs = EMPTY_GRAPH_CHANNEL_LIST,
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},
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.dev = dev,
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.uidev = uidev,
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};
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return &node->as_GraphNode;
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}
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static void destroy
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(GraphNodeSpecification * self, GraphNode * target)
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{
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(void) self;
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UinputGraphNode * node = DOWNCAST(UinputGraphNode, GraphNode, target);
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if (node->uidev) {
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libevdev_uinput_destroy(node->uidev);
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node->uidev = NULL;
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}
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if (node->dev) {
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libevdev_free(node->dev);
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node->dev = NULL;
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}
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free(target);
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}
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GraphNodeSpecification nodespec_uinput = (GraphNodeSpecification) {
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.create = &create,
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.destroy = &destroy,
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.register_io = NULL,
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.name = "uinput",
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.documentation = "Writes received events to a new uinput device\nAccepts events on any connector\nDoes not send events"
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"\nOption 'name' (required): device name provided to uinput"
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"\nOption 'enabled_codes' (required): collection of event code specifications:"
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"\n\tField 'major' (required): evdev event type"
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"\n\tField 'minor' (required): evdev event code"
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"\n\tField 'data' (optional): integer (useful with major = \"even_type.REP\") or absinfo (useful with major = \"even_type.ABS\"):"
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"\n\t\tField 'value' (optional): initial axis value"
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"\n\t\tField 'minimum' (optional): minimum axis value"
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"\n\t\tField 'maximum' (optional): maximum axis value"
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"\n\t\tField 'fuzz' (optional): axis noise gate"
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"\n\t\tField 'flat' (optional): axis dead zone"
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"\n\t\tField 'resolution' (optional): axis resolution"
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,
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};
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MODULE_CONSTRUCTOR(init)
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{
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register_graph_node_specification(&nodespec_uinput);
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}
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