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#include <linux/input.h>
#include <fcntl.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
#include "midimonster.h"
#include "uinput.h"
#define BACKEND_NAME "uinput"
int init() {
backend uinput = {
.name = BACKEND_NAME,
.conf = backend_configure,
.create = backend_instance,
.conf_instance = backend_configure_instance,
.channel = backend_channel,
.handle = backend_set,
.process = backend_handle,
.start = backend_start,
.shutdown = backend_shutdown
};
if (mm_backend_register(uinput)) {
fprintf(stderr, "Failed to register uinput backend\n");
return 1;
}
return 0;
}
static int backend_configure(char* option, char* value) {
fprintf(stderr, "Not implemented\n");
return 1;
}
static int backend_configure_instance(instance* inst, char* option, char* value) {
uinput_instance* data = (uinput_instance*) inst->impl;
if (!strcmp(option, "device")) {
if (data->device_path) {
free(data->device_path);
}
data->device_path = strdup(value);
if (!data->device_path) {
fprintf(stderr, "Failed to allocate memory\n");
return 1;
}
} else if (!strcmp(option, "name")) {
if (data->name) {
free(data->name);
}
data->name = strdup(option);
if (data->name) {
fprintf(stderr, "Failed to allocate memory\n");
return 1;
}
} else {
fprintf(stderr, "Unkown configuration parameter %s for uinput backend\n", option);
return 1;
}
return 0;
}
static channel* backend_channel(instance* inst, char* spec) {
uinput_instance* data = (uinput_instance*) inst->impl;
char* next = spec;
// type
unsigned long type = strtoul(spec, &next, 10);
if (spec == next) {
fprintf(stderr, "Cannot parse type\n");
return NULL;
}
if (type >= EV_MAX) {
fprintf(stderr, "Type is out of range\n");
return NULL;
}
if (next[0] != '.') {
fprintf(stderr, "Cannot parse code. Unknown character %c\n", next[0]);
return NULL;
}
spec = next + 1;
unsigned long code = strtoul(spec, &next, 10);
if (spec == next) {
fprintf(stderr, "Cannot parse code\n");
return NULL;
}
if (type == EV_SYN && code >= SYN_MAX) {
fprintf(stderr, "Code is out of range. Limit for SYN is %d\n", SYN_MAX);
} else if (type == EV_KEY && code >= KEY_MAX) {
fprintf(stderr, "Code is out of range. Limit for KEY is %d\n", KEY_MAX);
return NULL;
} else if (type == EV_REL && code >= REL_MAX) {
fprintf(stderr, "Code is out of range. Limit for REL is %d\n", REL_MAX);
return NULL;
} else if (type == EV_ABS && code >= ABS_MAX) {
fprintf(stderr, "Code is out of range. Limit for ABS is %d\n", ABS_MAX);
return NULL;
} else if (type == EV_SW && code >= SW_MAX) {
fprintf(stderr, "Code is out of range. Limit for SW is %d\n", SW_MAX);
return NULL;
} else if (type == EV_MSC && code >= MSC_MAX) {
fprintf(stderr, "Code is out of range. Limit for MSC is %d\n", MSC_MAX);
return NULL;
} else if (type == EV_LED && code >= LED_MAX) {
fprintf(stderr, "Code is out of range. Limit for LED is %d\n", LED_MAX);
return NULL;
} else if (type == EV_REP && code >= REP_MAX) {
fprintf(stderr, "Code is out of range. Limit for REP is %d\n", REP_MAX);
return NULL;
} else if (type == EV_SND && code >= SND_MAX) {
fprintf(stderr, "Code is out of range. Limit for SND is %d\n", SND_MAX);
}
if (next[0] != '.') {
fprintf(stderr, "Cannot parse value. Unknown character %c\n", next[0]);
return NULL;
}
spec = next + 1;
long value = strtol(spec, &next, 10);
if (spec == next) {
fprintf(stderr, "Cannot parse value\n");
return NULL;
}
if (type == EV_KEY && (value != 0 || value != 1)) {
fprintf(stderr, "Value of KEY is out of range. Only values 0 and 1 are supported for KEY.");
return NULL;
}
// find event
unsigned u;
for (u = 0; u < data->size_events; u++) {
if (data->events[u].type == type
&& data->events[u].code == code
&& data->events[u].value == value) {
break;
}
}
if (u == data->size_events) {
data->events = realloc(data->events, (u + 1) * sizeof(struct input_event));
if (!data->events) {
fprintf(stderr, "Failed to allocate memory\n");
return NULL;
}
data->events[u].type = (uint16_t) type;
data->events[u].code = (uint16_t) code;
data->events[u].value = (int32_t) value;
data->size_events++;
}
return mm_channel(inst, u, 1);
}
static instance* backend_instance() {
// TODO impl
return NULL;
}
static int backend_handle(size_t num, managed_fd* fds) {
//TODO impl
return 0;
}
static int uinput_open_input_device(uinput_instance* data) {
if (!data->device_path) {
return 0;
}
data->fd_in = open(data->device_path, O_RDONLY | O_NONBLOCK);
if (data->fd_in < 0) {
fprintf(stderr, "Failed to open device %s: %s\n", data->device_path, strerror(errno));
return 1;
}
return 0;
}
static int uinput_create_output_device(uinput_instance* data) {
//TODO impl
return 0;
}
static int backend_start() {
size_t n;
instance** inst = NULL;
uinput_instance* data;
if (mm_backend_instances(BACKEND_NAME, &n, &inst)) {
fprintf(stderr, "Failed to fetch instance list\n");
return 1;
}
if (!n) {
free(inst);
return 0;
}
for (unsigned p = 0; p < n; p++) {
data = (uinput_instance*) inst[p]->impl;
if (data->name) {
uinput_open_input_device(data);
uinput_create_output_device(data);
}
}
free(inst);
return 0;
}
static int backend_set(instance* inst, size_t num, channel** c, channel_value* v) {
//TODO impl
return 0;
}
static int backend_shutdown() {
//TODO impl
return 0;
}
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