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/*
* Copyright (c) 2013 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
* Authors:
* Chris Wilson <chris@chris-wilson.co.uk>
*
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <dirent.h>
#include <fcntl.h>
#include <errno.h>
#include "sna.h"
#define ACPI_SOCKET "/var/run/acpid.socket"
int sna_acpi_open(void)
{
struct sockaddr_un addr;
int fd, ret;
DBG(("%s\n", __FUNCTION__));
fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd < 0)
return -1;
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, ACPI_SOCKET);
ret = connect(fd, (struct sockaddr *)&addr, sizeof(addr));
if (ret < 0) {
close(fd);
return -1;
}
DBG(("%s: opened socket to APCI daemon, fd=%d\n", __FUNCTION__, fd));
return fd;
}
void _sna_acpi_wakeup(struct sna *sna)
{
char *eol;
int n;
n = read(sna->acpi.fd,
sna->acpi.event + sna->acpi.offset,
sna->acpi.remain);
DBG(("%s: read %d bytes from acpid\n", __FUNCTION__, n));
if (n <= 0) {
/* We will get '0' if we run out of space whilst reading
* one event - that should never happen, so treat it as
* an error and give up.
*/
if (n < 0)
n = errno;
switch (n) {
case EAGAIN:
case EINTR:
return;
}
DBG(("%s: error [%d], detaching from acpid\n", __FUNCTION__, n));
/* XXX reattach later? */
RemoveNotifyFd(sna->acpi.fd);
sna_acpi_fini(sna);
return;
}
sna->acpi.event[sna->acpi.offset + n] = '\0';
sna->acpi.offset += n;
sna->acpi.remain -= n;
DBG(("%s: event string [%d]: '%s'\n", __FUNCTION__, sna->acpi.offset, sna->acpi.event));
do {
eol = strchr(sna->acpi.event, '\n');
if (eol == NULL)
return;
if (strncmp(sna->acpi.event, "ac_adapter", 10) == 0) {
char *space = sna->acpi.event;
int state = -1;
/* ac_adapter ACAD 00000080 00000001 */
space = strchr(space, ' ');
if (space)
space = strchr(space + 1, ' ');
if (space)
space = strchr(space + 1, ' ');
if (space)
state = atoi(space + 1);
DBG(("%s: ac_adapter event new state=%d\n", __FUNCTION__, state));
if (state)
sna->flags &= ~SNA_POWERSAVE;
else
sna->flags |= SNA_POWERSAVE;
}
n = (sna->acpi.event + sna->acpi.offset) - ++eol;
memmove(sna->acpi.event, eol, n+1);
sna->acpi.offset = n;
sna->acpi.remain = sizeof(sna->acpi.event) - 1 - n;
} while (n);
}
#if HAVE_NOTIFY_FD
static void sna_acpi_notify(int fd, int read, void *data)
{
_sna_acpi_wakeup(data);
}
#endif
static int read_power_state(const char *path)
{
DIR *dir;
struct dirent *de;
int i = -1;
DBG(("%s: searching '%s'\n", __FUNCTION__, path));
dir = opendir(path);
if (dir == NULL)
return -1;
while ((de = readdir(dir))) {
char buf[1024];
int fd;
if (*de->d_name == '.')
continue;
DBG(("%s: checking '%s'\n", __FUNCTION__, de->d_name));
snprintf(buf, sizeof(buf), "%s/%s/type", path, de->d_name);
fd = open(buf, 0);
if (fd < 0)
continue;
i = read(fd, buf, sizeof(buf));
buf[i > 0 ? i - 1: 0] = '\0';
close(fd);
DBG(("%s: %s is of type '%s'\n", __FUNCTION__, de->d_name, buf));
if (strcmp(buf, "Mains"))
continue;
snprintf(buf, sizeof(buf), "%s/%s/online", path, de->d_name);
fd = open(buf, 0);
if (fd < 0)
continue;
i = read(fd, buf, sizeof(buf));
buf[i > 0 ? i - 1: 0] = '\0';
if (i > 0)
i = atoi(buf);
DBG(("%s: %s is online? '%s'\n", __FUNCTION__, de->d_name, buf));
close(fd);
break;
}
closedir(dir);
return i;
}
void sna_acpi_init(struct sna *sna)
{
if (sna->acpi.fd < 0)
return;
if (sna->flags & SNA_PERFORMANCE)
return;
DBG(("%s: attaching to acpid\n", __FUNCTION__));
SetNotifyFd(sna->acpi.fd, sna_acpi_notify, X_NOTIFY_READ, sna);
sna->acpi.remain = sizeof(sna->acpi.event) - 1;
sna->acpi.offset = 0;
/* Read initial states */
if (read_power_state("/sys/class/power_supply") == 0) {
DBG(("%s: AC adapter is currently offline\n", __FUNCTION__));
sna->flags |= SNA_POWERSAVE;
}
}
void sna_acpi_fini(struct sna *sna)
{
if (sna->acpi.fd < 0)
return;
close(sna->acpi.fd);
sna->acpi.fd = -1;
sna->flags &= ~SNA_POWERSAVE;
}
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