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module/battery: use libudev to monitor for battery changes

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This allows us to detect plug/unplug events immediately, instead of
having to wait for the next poll event.

Unfortunately, capacity changes do not appear to generate events :(
This commit is contained in:
Daniel Eklöf 2018-12-16 17:04:44 +01:00
parent 47b36bdd35
commit fa3c17aa4a
2 changed files with 44 additions and 7 deletions
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47
modules/battery/battery.c
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@ -11,6 +11,8 @@
#include <sys/stat.h>
#include <fcntl.h>
#include <libudev.h>
#include "../../bar.h"
enum state { STATE_FULL, STATE_CHARGING, STATE_DISCHARGING };
@ -183,7 +185,41 @@ run(struct module_run_context *ctx)
int power_fd = openat(base_dir_fd, "power_now", O_RDONLY);
assert(power_fd != -1);
do {
struct udev *udev = udev_new();
assert(udev != NULL);
struct udev_monitor *mon = udev_monitor_new_from_netlink(udev, "udev");
assert(mon != NULL);
int r = udev_monitor_filter_add_match_subsystem_devtype(mon, "power_supply", NULL);
assert(r == 0);
r = udev_monitor_enable_receiving(mon);
assert(r == 0);
bool first = true;
while (true) {
if (!first) {
struct pollfd fds[] = {
{.fd = ctx->abort_fd, .events = POLLIN},
{.fd = udev_monitor_get_fd(mon), .events = POLLIN},
};
poll(fds, 2, m->poll_interval * 1000);
if (fds[0].revents & POLLIN)
break;
if (fds[1].revents & POLLIN) {
struct udev_device *dev = udev_monitor_receive_device(mon);
bool is_us = strcmp(udev_device_get_sysname(dev), m->battery) == 0;
udev_device_unref(dev);
if (!is_us)
continue;
}
} else
first = false;
const char *status = readline_from_fd(status_fd);
if (strcmp(status, "Full") == 0)
m->state = STATE_FULL;
@ -207,13 +243,10 @@ run(struct module_run_context *ctx)
// m->capacity, m->energy, m->power);
bar->refresh(bar);
}
struct pollfd fds[] = {{.fd = ctx->abort_fd, .events = POLLIN}};
poll(fds, 1, m->poll_interval * 1000);
if (fds[0].revents & POLLIN)
break;
} while (true);
udev_monitor_unref(mon);
udev_unref(udev);
close(power_fd);
close(energy_fd);