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#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <string.h>
#include "xf86drm.h"
#include "xf86drmMode.h"
/* structs for the demo_driver */
#define DEMO_MAX_OUTPUTS 8
struct demo_driver
{
/* drm stuff */
int fd;
drmModeResPtr res;
uint32_t counter;
drmModeOutputPtr outputs[DEMO_MAX_OUTPUTS];
};
struct demo_driver* demoCreateDriver(void);
void demoUpdateRes(struct demo_driver *driver);
void demoPopulateOutputs(struct demo_driver *driver);
void demoHotplug(struct demo_driver *driver);
const char* demoGetStatus(drmModeOutputPtr out);
int main(int argc, char **argv)
{
struct demo_driver *driver;
uint32_t temp;
int i;
printf("starting demo\n");
driver = demoCreateDriver();
if (!driver) {
printf("failed to create driver\n");
return 1;
}
driver->counter = drmModeGetHotplug(driver->fd);
demoPopulateOutputs(driver);
while (driver->counter != (temp = drmModeGetHotplug(driver->fd))) {
demoPopulateOutputs(driver);
driver->counter = temp;
}
for (i = 0; i < driver->res->count_outputs && i < DEMO_MAX_OUTPUTS; i++) {
printf("Output %u is %s\n",
driver->outputs[i]->output_id,
demoGetStatus(driver->outputs[i]));
}
while(1) {
usleep(100000);
temp = drmModeGetHotplug(driver->fd);
if (temp == driver->counter)
continue;
demoHotplug(driver);
driver->counter = temp;
}
return 0;
}
const char* demoGetStatus(drmModeOutputPtr output)
{
switch (output->connection) {
case DRM_MODE_CONNECTED:
return "connected";
case DRM_MODE_DISCONNECTED:
return "disconnected";
default:
return "unknown";
}
}
void demoHotplug(struct demo_driver *driver)
{
drmModeResPtr res = driver->res;
int i;
drmModeOutputPtr temp, current;
for (i = 0; i < res->count_outputs && i < DEMO_MAX_OUTPUTS; i++) {
temp = drmModeGetOutput(driver->fd, res->outputs[i]);
current = driver->outputs[i];
if (temp->connection != current->connection) {
printf("Output %u became %s was %s\n",
temp->output_id,
demoGetStatus(temp),
demoGetStatus(current));
}
drmModeFreeOutput(current);
driver->outputs[i] = temp;
}
}
void demoPopulateOutputs(struct demo_driver *driver)
{
drmModeResPtr res = driver->res;
int i;
for (i = 0; i < res->count_outputs && i < DEMO_MAX_OUTPUTS; i++) {
drmModeFreeOutput(driver->outputs[i]);
driver->outputs[i] = drmModeGetOutput(driver->fd, res->outputs[i]);
}
}
struct demo_driver* demoCreateDriver(void)
{
struct demo_driver* driver = malloc(sizeof(struct demo_driver));
memset(driver, 0, sizeof(struct demo_driver));
driver->fd = drmOpenControl(0);
if (driver->fd < 0) {
printf("Failed to open the card fb\n");
goto err_driver;
}
demoUpdateRes(driver);
if (!driver->res) {
printf("could not retrive resources\n");
goto err_res;
}
return driver;
err_res:
drmClose(driver->fd);
err_driver:
free(driver);
return NULL;
}
void demoUpdateRes(struct demo_driver *driver)
{
if (driver->res)
drmModeFreeResources(driver->res);
driver->res = drmModeGetResources(driver->fd);
if (!driver->res)
printf("failed to get resources from kernel\n");
}
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