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SDL_syspower.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2009 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
#include "SDL_config.h"
#ifndef SDL_POWER_DISABLED
#ifdef SDL_POWER_LINUX
#include <stdio.h>
#include <unistd.h>
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#include <sys/types.h>
#include <sys/stat.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include "SDL_power.h"
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static const char *proc_acpi_path = "/proc/acpi/battery";
static int open_acpi_file(const char *node, const char *key)
{
const size_t pathlen = strlen(proc_acpi_path)+strlen(node)+strlen(key)+3;
char *path = (char *) alloca(pathlen);
if (path == NULL) {
return -1; /* oh well. */
}
snprintf(path, pathlen, "%s/%s/%s", proc_acpi_path, node, key);
return open(path, O_RDONLY);
}
static SDL_bool
load_acpi_file(const char *node, const char *key, char *buf, size_t buflen)
{
ssize_t br = 0;
const int fd = open_acpi_file(node, key);
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if (fd == -1) {
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return SDL_FALSE;
}
br = read(fd, buf, buflen-1);
close(fd);
if (br < 0) {
return SDL_FALSE;
}
buf[br] = '\0'; // null-terminate the string.
return SDL_TRUE;
}
static SDL_bool
make_acpi_key_val(char **_ptr, char **_key, char **_val)
{
char *ptr = *_ptr;
while (*ptr == ' ') {
ptr++; /* skip whitespace. */
}
if (*ptr == '\0') {
return SDL_FALSE; /* EOF. */
}
*_key = ptr;
while ((*ptr != ':') && (*ptr != '\0')) {
ptr++;
}
if (*ptr == '\0') {
return SDL_FALSE; /* (unexpected) EOF. */
}
*(ptr++) = '\0'; /* terminate the key. */
while ((*ptr == ' ') && (*ptr != '\0')) {
ptr++; /* skip whitespace. */
}
if (*ptr == '\0') {
return SDL_FALSE; /* (unexpected) EOF. */
}
*_val = ptr;
while ((*ptr != '\n') && (*ptr != '\0')) {
ptr++;
}
if (*ptr != '\0') {
*(ptr++) = '\0'; /* terminate the value. */
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}
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*_ptr = ptr; /* store for next time. */
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return SDL_TRUE;
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}
static void
check_acpi(const char * fname, SDL_bool * have_ac, SDL_bool * have_battery,
SDL_bool * charging, int *seconds, int *percent)
{
int fd = -1;
char info[1024];
char state[1024];
ssize_t br = 0;
char *ptr = NULL;
char *key = NULL;
char *val = NULL;
SDL_bool charge = SDL_FALSE;
SDL_bool choose = SDL_FALSE;
SDL_bool is_ac = SDL_FALSE;
int maximum = -1;
int remaining = -1;
int secs = -1;
int pct = -1;
if (!load_acpi_file(fname, "state", state, sizeof (state))) {
return;
} else if (!load_acpi_file(fname, "info", info, sizeof (info))) {
return;
}
ptr = &state[0];
while (make_acpi_key_val(&ptr, &key, &val)) {
if (strcmp(key, "present") == 0) {
if (strcmp(val, "yes") == 0) {
*have_battery = SDL_TRUE;
}
} else if (strcmp(key, "charging state") == 0) {
/* !!! FIXME: what exactly _does_ charging/discharging mean? */
if (strcmp(val, "charging/discharging") == 0) {
*have_ac = is_ac = SDL_TRUE;
charge = SDL_TRUE;
} else if (strcmp(val, "charging") == 0) {
*have_ac = is_ac = SDL_TRUE;
charge = SDL_TRUE;
} else if (strcmp(val, "charged") == 0) {
/* !!! FIXME: maybe another battery is discharging,
!!! FIXME: instead of AC connection. */
*have_ac = is_ac = SDL_TRUE;
charge = SDL_TRUE;
}
} else if (strcmp(key, "remaining capacity") == 0) {
char *endptr = NULL;
const int cvt = (int) strtol(val, &endptr, 10);
if (*endptr == ' ') {
remaining = cvt;
}
}
}
ptr = &info[0];
while (make_acpi_key_val(&ptr, &key, &val)) {
if (strcmp(key, "design capacity") == 0) {
char *endptr = NULL;
const int cvt = (int) strtol(val, &endptr, 10);
if (*endptr == ' ') {
maximum = cvt;
}
}
}
if ((maximum >= 0) && (remaining >= 0)) {
pct = (int) ((((float) remaining) / ((float) maximum)) * 100.0f);
if (pct < 0) {
pct = 0;
} else if (pct > 100) {
pct = 100;
}
}
/* !!! FIXME: calculate (secs). */
/*
* We pick the battery that claims to have the most minutes left.
* (failing a report of minutes, we'll take the highest percent.)
*/
if ((secs < 0) && (*seconds < 0)) {
if ((pct < 0) && (*percent < 0)) {
choose = SDL_TRUE; /* at least we know there's a battery. */
}
if (pct > *percent) {
choose = SDL_TRUE;
}
} else if (secs > *seconds) {
choose = SDL_TRUE;
}
if (choose) {
*seconds = secs;
*percent = pct;
*charging = charge;
}
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}
SDL_bool
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SDL_GetPowerInfo_Linux_proc_acpi(SDL_PowerState * state,
int *seconds, int *percent)
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{
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struct dirent *dent = NULL;
DIR *dirp = NULL;
SDL_bool have_ac = SDL_FALSE;
SDL_bool have_battery = SDL_FALSE;
SDL_bool charging = SDL_FALSE;
*seconds = -1;
*percent = -1;
*state = SDL_POWERSTATE_UNKNOWN;
dirp = opendir(proc_acpi_path);
if (dirp == NULL) {
return SDL_FALSE; /* can't use this interface. */
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}
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while ((dent = readdir(dirp)) != NULL) {
const char *name = dent->d_name;
check_acpi(name, &have_ac, &have_battery, &charging, seconds, percent);
}
if (!have_battery) {
*state = SDL_POWERSTATE_NO_BATTERY;
} else if (charging) {
*state = SDL_POWERSTATE_CHARGING;
} else if (have_ac) {
*state = SDL_POWERSTATE_CHARGED;
} else {
*state = SDL_POWERSTATE_ON_BATTERY;
}
return SDL_TRUE; /* definitive answer. */
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}
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static SDL_bool
next_string(char **_ptr, char **_str)
{
char *ptr = *_ptr;
char *str = *_str;
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while (*ptr == ' ') { /* skip any spaces... */
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ptr++;
}
if (*ptr == '\0') {
return SDL_FALSE;
}
str = ptr;
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while ((*ptr != ' ') && (*ptr != '\n') && (*ptr != '\0'))
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ptr++;
if (*ptr != '\0')
*(ptr++) = '\0';
*_str = str;
*_ptr = ptr;
return SDL_TRUE;
}
static SDL_bool
int_string(char *str, int *val)
{
char *endptr = NULL;
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*val = (int) strtol(str + 2, &endptr, 16);
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return ((*str != '\0') && (*endptr == '\0'));
}
/* http://lxr.linux.no/linux+v2.6.29/drivers/char/apm-emulation.c */
SDL_bool
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SDL_GetPowerInfo_Linux_proc_apm(SDL_PowerState * state,
int *seconds, int *percent)
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{
SDL_bool need_details = SDL_FALSE;
int ac_status = 0;
int battery_status = 0;
int battery_flag = 0;
int battery_percent = 0;
int battery_time = 0;
const int fd = open("/proc/apm", O_RDONLY);
char buf[128];
char *ptr = &buf[0];
char *str = NULL;
ssize_t br;
if (fd == -1) {
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return SDL_FALSE; /* can't use this interface. */
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}
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br = read(fd, buf, sizeof (buf) - 1);
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close(fd);
if (br < 0) {
return SDL_FALSE;
}
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buf[br] = '\0'; // null-terminate the string.
if (!next_string(&ptr, &str)) { /* driver version */
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return SDL_FALSE;
}
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if (!next_string(&ptr, &str)) { /* BIOS version */
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return SDL_FALSE;
}
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if (!next_string(&ptr, &str)) { /* APM flags */
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return SDL_FALSE;
}
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if (!next_string(&ptr, &str)) { /* AC line status */
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return SDL_FALSE;
} else if (!int_string(str, &ac_status)) {
return SDL_FALSE;
}
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if (!next_string(&ptr, &str)) { /* battery status */
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return SDL_FALSE;
} else if (!int_string(str, &battery_status)) {
return SDL_FALSE;
}
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if (!next_string(&ptr, &str)) { /* battery flag */
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return SDL_FALSE;
} else if (!int_string(str, &battery_flag)) {
return SDL_FALSE;
}
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if (!next_string(&ptr, &str)) { /* remaining battery life percent */
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return SDL_FALSE;
}
if (str[strlen(str) - 1] == '%') {
str[strlen(str) - 1] = '\0';
}
if (!int_string(str, &battery_percent)) {
return SDL_FALSE;
}
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if (!next_string(&ptr, &str)) { /* remaining battery life time */
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return SDL_FALSE;
} else if (!int_string(str, &battery_time)) {
return SDL_FALSE;
}
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if (!next_string(&ptr, &str)) { /* remaining battery life time units */
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return SDL_FALSE;
} else if (strcmp(str, "min") == 0) {
battery_time *= 60;
}
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if (battery_flag == 0xFF) { /* unknown state */
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*state = SDL_POWERSTATE_UNKNOWN;
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} else if (battery_flag & (1 << 7)) { /* no battery */
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*state = SDL_POWERSTATE_NO_BATTERY;
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} else if (battery_flag & (1 << 3)) { /* charging */
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*state = SDL_POWERSTATE_CHARGING;
need_details = SDL_TRUE;
} else if (ac_status == 1) {
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*state = SDL_POWERSTATE_CHARGED; /* on AC, not charging. */
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need_details = SDL_TRUE;
} else {
*state = SDL_POWERSTATE_ON_BATTERY;
need_details = SDL_TRUE;
}
*percent = -1;
*seconds = -1;
if (need_details) {
const int pct = battery_percent;
const int secs = battery_time;
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if (pct >= 0) { /* -1 == unknown */
*percent = (pct > 100) ? 100 : pct; /* clamp between 0%, 100% */
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}
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if (secs >= 0) { /* -1 == unknown */
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*seconds = secs;
}
}
return SDL_TRUE;
}
#endif /* SDL_POWER_LINUX */
#endif /* SDL_POWER_DISABLED */
/* vi: set ts=4 sw=4 expandtab: */