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flycast/core/linux-dist/evdev.cpp

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#include <unistd.h>
#include <fcntl.h>
#include <linux/input.h>
#include "linux-dist/evdev.h"
#include "linux-dist/main.h"
#include "cfg/ini.h"
#include <vector>
#include <map>
#include <dlfcn.h>
#if defined(USE_EVDEV)
bool libevdev_tried = false;
bool libevdev_available = false;
typedef int (*libevdev_func1_t)(int, const char*);
typedef const char* (*libevdev_func2_t)(int, int);
libevdev_func1_t libevdev_event_code_from_name;
libevdev_func2_t libevdev_event_code_get_name;
void load_libevdev()
{
if (libevdev_tried)
{
return;
}
libevdev_tried = true;
void* lib_handle = dlopen("libevdev.so", RTLD_NOW);
bool failed = false;
if (!lib_handle)
{
fprintf(stderr, "%s\n", dlerror());
failed = true;
}
else
{
libevdev_event_code_from_name = reinterpret_cast<libevdev_func1_t>(dlsym(lib_handle, "libevdev_event_code_from_name"));
const char* error1 = dlerror();
if (error1 != NULL)
{
fprintf(stderr, "%s\n", error1);
failed = true;
}
libevdev_event_code_get_name = reinterpret_cast<libevdev_func2_t>(dlsym(lib_handle, "libevdev_event_code_get_name"));
const char* error2 = dlerror();
if (error2 != NULL)
{
fprintf(stderr, "%s\n", error2);
failed = true;
}
}
if(failed)
{
puts("WARNING: libevdev is not available. You'll not be able to use button names instead of numeric codes in your controller mappings!\n");
return;
}
libevdev_available = true;
}
s8 EvdevAxisData::convert(s32 value)
{
return (((value - min) * 255) / range);
}
void EvdevAxisData::init(int fd, int code, bool inverted)
{
struct input_absinfo abs;
if(code < 0 || ioctl(fd, EVIOCGABS(code), &abs))
{
if(code >= 0)
{
perror("evdev ioctl");
}
this->range = 255;
this->min = 0;
return;
}
s32 min = abs.minimum;
s32 max = abs.maximum;
printf("evdev: range of axis %d is from %d to %d\n", code, min, max);
if(inverted)
{
this->range = (min - max);
this->min = max;
}
else
{
this->range = (max - min);
this->min = min;
}
}
void EvdevController::init()
{
this->data_x.init(this->fd, this->mapping->Axis_Analog_X, this->mapping->Axis_Analog_X_Inverted);
this->data_y.init(this->fd, this->mapping->Axis_Analog_Y, this->mapping->Axis_Analog_Y_Inverted);
this->data_trigger_left.init(this->fd, this->mapping->Axis_Trigger_Left, this->mapping->Axis_Trigger_Left_Inverted);
this->data_trigger_right.init(this->fd, this->mapping->Axis_Trigger_Right, this->mapping->Axis_Trigger_Right_Inverted);
this->rumble_effect_id = -1;
}
std::map<std::string, EvdevControllerMapping> loaded_mappings;
int load_keycode(ConfigFile* cfg, string section, string dc_key)
{
int code = -1;
string keycode = cfg->get(section, dc_key, "-1");
if (strstr(keycode.c_str(), "KEY_") != NULL ||
strstr(keycode.c_str(), "BTN_") != NULL ||
strstr(keycode.c_str(), "ABS_") != NULL)
{
if(libevdev_available)
{
int type = ((strstr(keycode.c_str(), "ABS_") != NULL) ? EV_ABS : EV_KEY);
code = libevdev_event_code_from_name(type, keycode.c_str());
}
if(code < 0)
{
printf("evdev: failed to find keycode for '%s'\n", keycode.c_str());
}
else
{
printf("%s = %s (%d)\n", dc_key.c_str(), keycode.c_str(), code);
}
return code;
}
code = cfg->get_int(section, dc_key, -1);
if(code >= 0)
{
char* name = NULL;
if(libevdev_available)
{
int type = ((strstr(dc_key.c_str(), "axis_") != NULL) ? EV_ABS : EV_KEY);
name = (char*)libevdev_event_code_get_name(type, code);
}
if (name != NULL)
{
printf("%s = %s (%d)\n", dc_key.c_str(), name, code);
}
else
{
printf("%s = %d\n", dc_key.c_str(), code);
}
}
return code;
}
EvdevControllerMapping load_mapping(FILE* fd)
{
ConfigFile mf;
mf.parse(fd);
EvdevControllerMapping mapping = {
mf.get("emulator", "mapping_name", "<Unknown>"),
load_keycode(&mf, "dreamcast", "btn_a"),
load_keycode(&mf, "dreamcast", "btn_b"),
load_keycode(&mf, "dreamcast", "btn_c"),
load_keycode(&mf, "dreamcast", "btn_d"),
load_keycode(&mf, "dreamcast", "btn_x"),
load_keycode(&mf, "dreamcast", "btn_y"),
load_keycode(&mf, "dreamcast", "btn_z"),
load_keycode(&mf, "dreamcast", "btn_start"),
load_keycode(&mf, "emulator", "btn_escape"),
load_keycode(&mf, "dreamcast", "btn_dpad1_left"),
load_keycode(&mf, "dreamcast", "btn_dpad1_right"),
load_keycode(&mf, "dreamcast", "btn_dpad1_up"),
load_keycode(&mf, "dreamcast", "btn_dpad1_down"),
load_keycode(&mf, "dreamcast", "btn_dpad2_left"),
load_keycode(&mf, "dreamcast", "btn_dpad2_right"),
load_keycode(&mf, "dreamcast", "btn_dpad2_up"),
load_keycode(&mf, "dreamcast", "btn_dpad2_down"),
load_keycode(&mf, "compat", "btn_trigger_left"),
load_keycode(&mf, "compat", "btn_trigger_right"),
load_keycode(&mf, "compat", "axis_dpad1_x"),
load_keycode(&mf, "compat", "axis_dpad1_y"),
load_keycode(&mf, "compat", "axis_dpad2_x"),
load_keycode(&mf, "compat", "axis_dpad2_y"),
load_keycode(&mf, "dreamcast", "axis_x"),
load_keycode(&mf, "dreamcast", "axis_y"),
load_keycode(&mf, "dreamcast", "axis_trigger_left"),
load_keycode(&mf, "dreamcast", "axis_trigger_right"),
mf.get_bool("compat", "axis_x_inverted", false),
mf.get_bool("compat", "axis_y_inverted", false),
mf.get_bool("compat", "axis_trigger_left_inverted", false),
mf.get_bool("compat", "axis_trigger_right_inverted", false)
};
return mapping;
}
int input_evdev_init(EvdevController* controller, const char* device, const char* custom_mapping_fname = NULL)
{
load_libevdev();
char name[256] = "Unknown";
printf("evdev: Trying to open device at '%s'\n", device);
int fd = open(device, O_RDWR);
if (fd >= 0)
{
fcntl(fd, F_SETFL, O_NONBLOCK);
if(ioctl(fd, EVIOCGNAME(sizeof(name)), name) < 0)
{
perror("evdev: ioctl");
return -2;
}
else
{
printf("evdev: Found '%s' at '%s'\n", name, device);
controller->fd = fd;
const char* mapping_fname;
if(custom_mapping_fname != NULL)
{
// custom mapping defined in config, use that
mapping_fname = custom_mapping_fname;
printf("evdev: user defined custom mapping found (%s)\n", custom_mapping_fname);
}
else
{
#if defined(TARGET_PANDORA)
mapping_fname = "controller_pandora.cfg";
#elif defined(TARGET_GCW0)
mapping_fname = "controller_gcwz.cfg";
#else
// check if a config file name <device>.cfg exists in the /mappings/ directory
char* name_cfg = (char*)malloc(strlen(name)+4);
strcpy(name_cfg, name);
strcat(name_cfg, ".cfg");
size_t size_needed = snprintf(NULL, 0, EVDEV_MAPPING_PATH, name_cfg) + 1;
char* mapping_path = (char*)malloc(size_needed);
sprintf(mapping_path, EVDEV_MAPPING_PATH, name_cfg);
string dir = get_readonly_data_path(mapping_path);
free(mapping_path);
if (file_exists(dir)) {
printf("evdev: found a named mapping for the device (%s)\n", name_cfg);
mapping_fname = name_cfg;
}
else {
free(name_cfg);
if (strcmp(name, "Microsoft X-Box 360 pad") == 0 ||
strcmp(name, "Xbox 360 Wireless Receiver") == 0 ||
strcmp(name, "Xbox 360 Wireless Receiver (XBOX)") == 0)
{
mapping_fname = "controller_xpad.cfg";
}
else if (strstr(name, "Xbox Gamepad (userspace driver)") != NULL)
{
mapping_fname = "controller_xboxdrv.cfg";
}
else if (strstr(name, "keyboard") != NULL ||
strstr(name, "Keyboard") != NULL)
{
mapping_fname = "keyboard.cfg";
}
else
{
mapping_fname = "controller_generic.cfg";
}
}
#endif
}
if(loaded_mappings.count(string(mapping_fname)) == 0)
{
FILE* mapping_fd = NULL;
if(mapping_fname[0] == '/')
{
// Absolute mapping
mapping_fd = fopen(mapping_fname, "r");
}
else
{
// Mapping from ~/.reicast/mappings/
size_t size_needed = snprintf(NULL, 0, EVDEV_MAPPING_PATH, mapping_fname) + 1;
char* mapping_path = (char*)malloc(size_needed);
sprintf(mapping_path, EVDEV_MAPPING_PATH, mapping_fname);
mapping_fd = fopen(get_readonly_data_path(mapping_path).c_str(), "r");
free(mapping_path);
}
if(mapping_fd != NULL)
{
printf("evdev: reading mapping file: '%s'\n", mapping_fname);
loaded_mappings.insert(std::make_pair(string(mapping_fname), load_mapping(mapping_fd)));
fclose(mapping_fd);
}
else
{
printf("evdev: unable to open mapping file '%s'\n", mapping_fname);
perror("evdev");
return -3;
}
}
controller->mapping = &loaded_mappings.find(string(mapping_fname))->second;
printf("evdev: Using '%s' mapping\n", controller->mapping->name.c_str());
controller->init();
return 0;
}
}
else
{
perror("evdev: open");
return -1;
}
}
void start_shutdown(void);
bool input_evdev_handle(EvdevController* controller, u32 port)
{
#define SET_FLAG(field, mask, expr) field =((expr) ? (field & ~mask) : (field | mask))
if (controller->fd < 0 || controller->mapping == NULL)
{
return false;
}
input_event ie;
while(read(controller->fd, &ie, sizeof(ie)) == sizeof(ie))
{
switch(ie.type)
{
case EV_KEY:
if (ie.code == controller->mapping->Btn_A) {
SET_FLAG(kcode[port], DC_BTN_A, ie.value);
} else if (ie.code == controller->mapping->Btn_B) {
SET_FLAG(kcode[port], DC_BTN_B, ie.value);
} else if (ie.code == controller->mapping->Btn_C) {
SET_FLAG(kcode[port], DC_BTN_C, ie.value);
} else if (ie.code == controller->mapping->Btn_D) {
SET_FLAG(kcode[port], DC_BTN_D, ie.value);
} else if (ie.code == controller->mapping->Btn_X) {
SET_FLAG(kcode[port], DC_BTN_X, ie.value);
} else if (ie.code == controller->mapping->Btn_Y) {
SET_FLAG(kcode[port], DC_BTN_Y, ie.value);
} else if (ie.code == controller->mapping->Btn_Z) {
SET_FLAG(kcode[port], DC_BTN_Z, ie.value);
} else if (ie.code == controller->mapping->Btn_Start) {
SET_FLAG(kcode[port], DC_BTN_START, ie.value);
} else if (ie.code == controller->mapping->Btn_Escape) {
if (ie.value == 0)
start_shutdown();
} else if (ie.code == controller->mapping->Btn_DPad_Left) {
SET_FLAG(kcode[port], DC_DPAD_LEFT, ie.value);
} else if (ie.code == controller->mapping->Btn_DPad_Right) {
SET_FLAG(kcode[port], DC_DPAD_RIGHT, ie.value);
} else if (ie.code == controller->mapping->Btn_DPad_Up) {
SET_FLAG(kcode[port], DC_DPAD_UP, ie.value);
} else if (ie.code == controller->mapping->Btn_DPad_Down) {
SET_FLAG(kcode[port], DC_DPAD_DOWN, ie.value);
} else if (ie.code == controller->mapping->Btn_DPad2_Left) {
SET_FLAG(kcode[port], DC_DPAD2_LEFT, ie.value);
} else if (ie.code == controller->mapping->Btn_DPad2_Right) {
SET_FLAG(kcode[port], DC_DPAD2_RIGHT, ie.value);
} else if (ie.code == controller->mapping->Btn_DPad2_Up) {
SET_FLAG(kcode[port], DC_DPAD2_UP, ie.value);
} else if (ie.code == controller->mapping->Btn_DPad2_Down) {
SET_FLAG(kcode[port], DC_DPAD2_DOWN, ie.value);
} else if (ie.code == controller->mapping->Btn_Trigger_Left) {
lt[port] = (ie.value ? 255 : 0);
} else if (ie.code == controller->mapping->Btn_Trigger_Right) {
rt[port] = (ie.value ? 255 : 0);
}
break;
case EV_ABS:
if (ie.code == controller->mapping->Axis_DPad_X)
{
switch(ie.value)
{
case -1:
SET_FLAG(kcode[port], DC_DPAD_LEFT, 1);
SET_FLAG(kcode[port], DC_DPAD_RIGHT, 0);
break;
case 0:
SET_FLAG(kcode[port], DC_DPAD_LEFT, 0);
SET_FLAG(kcode[port], DC_DPAD_RIGHT, 0);
break;
case 1:
SET_FLAG(kcode[port], DC_DPAD_LEFT, 0);
SET_FLAG(kcode[port], DC_DPAD_RIGHT, 1);
break;
}
}
else if (ie.code == controller->mapping->Axis_DPad_Y)
{
switch(ie.value)
{
case -1:
SET_FLAG(kcode[port], DC_DPAD_UP, 1);
SET_FLAG(kcode[port], DC_DPAD_DOWN, 0);
break;
case 0:
SET_FLAG(kcode[port], DC_DPAD_UP, 0);
SET_FLAG(kcode[port], DC_DPAD_DOWN, 0);
break;
case 1:
SET_FLAG(kcode[port], DC_DPAD_UP, 0);
SET_FLAG(kcode[port], DC_DPAD_DOWN, 1);
break;
}
}
else if (ie.code == controller->mapping->Axis_DPad2_X)
{
switch(ie.value)
{
case -1:
SET_FLAG(kcode[port], DC_DPAD2_LEFT, 1);
SET_FLAG(kcode[port], DC_DPAD2_RIGHT, 0);
break;
case 0:
SET_FLAG(kcode[port], DC_DPAD2_LEFT, 0);
SET_FLAG(kcode[port], DC_DPAD2_RIGHT, 0);
break;
case 1:
SET_FLAG(kcode[port], DC_DPAD2_LEFT, 0);
SET_FLAG(kcode[port], DC_DPAD2_RIGHT, 1);
break;
}
}
else if (ie.code == controller->mapping->Axis_DPad2_X)
{
switch(ie.value)
{
case -1:
SET_FLAG(kcode[port], DC_DPAD2_UP, 1);
SET_FLAG(kcode[port], DC_DPAD2_DOWN, 0);
break;
case 0:
SET_FLAG(kcode[port], DC_DPAD2_UP, 0);
SET_FLAG(kcode[port], DC_DPAD2_DOWN, 0);
break;
case 1:
SET_FLAG(kcode[port], DC_DPAD2_UP, 0);
SET_FLAG(kcode[port], DC_DPAD2_DOWN, 1);
break;
}
}
else if (ie.code == controller->mapping->Axis_Analog_X)
{
joyx[port] = (controller->data_x.convert(ie.value) + 128);
}
else if (ie.code == controller->mapping->Axis_Analog_Y)
{
joyy[port] = (controller->data_y.convert(ie.value) + 128);
}
else if (ie.code == controller->mapping->Axis_Trigger_Left)
{
lt[port] = controller->data_trigger_left.convert(ie.value);
}
else if (ie.code == controller->mapping->Axis_Trigger_Right)
{
rt[port] = controller->data_trigger_right.convert(ie.value);
}
break;
}
}
}
void input_evdev_rumble(EvdevController* controller, u16 pow_strong, u16 pow_weak)
{
if (controller->fd < 0 || controller->rumble_effect_id == -2)
{
// Either the controller is not used or previous rumble effect failed
printf("RUMBLE: %s\n", "Skipped!");
return;
}
printf("RUMBLE: %u / %u (%d)\n", pow_strong, pow_weak, controller->rumble_effect_id);
struct ff_effect effect;
effect.type = FF_RUMBLE;
effect.id = controller->rumble_effect_id;
effect.u.rumble.strong_magnitude = pow_strong;
effect.u.rumble.weak_magnitude = pow_weak;
effect.replay.length = 0;
effect.replay.delay = 0;
if (ioctl(controller->fd, EVIOCSFF, &effect) == -1)
{
perror("evdev: Force feedback error");
controller->rumble_effect_id = -2;
}
else
{
controller->rumble_effect_id = effect.id;
// Let's play the effect
input_event play;
play.type = EV_FF;
play.code = effect.id;
play.value = 1;
if (write(controller->fd, (const void*) &play, sizeof(play)) == -1)
{
perror("evdev: Force feedback error");
controller->rumble_effect_id = -2;
}
}
}
#endif
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