diff options
Diffstat (limited to 'plugin_apm.c')
| -rw-r--r-- | plugin_apm.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/plugin_apm.c b/plugin_apm.c new file mode 100644 index 0000000..0ae7c70 --- /dev/null +++ b/plugin_apm.c @@ -0,0 +1,199 @@ +/* $Id: plugin_apm.c 840 2007-09-09 12:17:42Z michael $ + * $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_apm.c $ + * + * plugin for APM (battery status) + * + * Copyright (C) 2003 Michael Reinelt <michael@reinelt.co.at> + * Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net> + * + * based on the old 'battery.c' which is + * Copyright (C) 2001 Leopold Tötsch <lt@toetsch.at> + * + * This file is part of LCD4Linux. + * + * LCD4Linux is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2, or (at your option) + * any later version. + * + * LCD4Linux 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + */ + +/* + * exported functions: + * + * int plugin_init_apm (void) + * adds apm() function + * + */ + +#include "config.h" + +#include <stdlib.h> +#include <stdio.h> +#include <fcntl.h> +#include <unistd.h> +#include <string.h> +#include <errno.h> +#include <sys/ioctl.h> +#include <sys/types.h> +#include <asm/types.h> + +#include "debug.h" +#include "plugin.h" +#include "hash.h" + +static int fd = -2; +static HASH APM; + +/* from /usr/src/linux/arch/i386/kernel/apm.c: + * + * Arguments, with symbols from linux/apm_bios.h. Information is + * from the Get Power Status (0x0a) call unless otherwise noted. + * + * 0) Linux driver version (this will change if format changes) + * 1) APM BIOS Version. Usually 1.0, 1.1 or 1.2. + * 2) APM flags from APM Installation Check (0x00): + * bit 0: APM_16_BIT_SUPPORT + * bit 1: APM_32_BIT_SUPPORT + * bit 2: APM_IDLE_SLOWS_CLOCK + * bit 3: APM_BIOS_DISABLED + * bit 4: APM_BIOS_DISENGAGED + * 3) AC line status + * 0x00: Off-line + * 0x01: On-line + * 0x02: On backup power (BIOS >= 1.1 only) + * 0xff: Unknown + * 4) Battery status + * 0x00: High + * 0x01: Low + * 0x02: Critical + * 0x03: Charging + * 0x04: Selected battery not present (BIOS >= 1.2 only) + * 0xff: Unknown + * 5) Battery flag + * bit 0: High + * bit 1: Low + * bit 2: Critical + * bit 3: Charging + * bit 7: No system battery + * 0xff: Unknown + * 6) Remaining battery life (percentage of charge): + * 0-100: valid + * -1: Unknown + * 7) Remaining battery life (time units): + * Number of remaining minutes or seconds + * -1: Unknown + * 8) min = minutes; sec = seconds + * + * p+= sprintf(p, "%s %d.%d 0x%02x 0x%02x 0x%02x 0x%02x %d%% %d %s\n", + * driver_version, + * (apm_info.bios.version >> 8) & 0xff, + * apm_info.bios.version & 0xff, + * apm_info.bios.flags, + * ac_line_status, + * battery_status, + * battery_flag, + * percentage, + * time_units, + * units); + */ + + +static int parse_proc_apm(void) +{ + char *key[] = { "driver_version", + "bios_version", + "bios_flags", + "line_status", + "battery_status", + "battery_flag", + "battery_percent", + "battery_remaining", + "time_units" + }; + + char buffer[128], *beg, *end; + int age, i; + + /* reread every 10 msec only */ + age = hash_age(&APM, NULL); + if (age > 0 && age <= 10) + return 0; + + if (fd == -2) { + fd = open("/proc/apm", O_RDONLY | O_NDELAY); + if (fd == -1) { + error("open(/proc/apm) failed: %s", strerror(errno)); + return -1; + } + } + + if (lseek(fd, 0L, SEEK_SET) != 0) { + error("lseek(/proc/apm) failed: %s", strerror(errno)); + fd = -1; + return -1; + } + + if (read(fd, &buffer, sizeof(buffer) - 1) == -1) { + error("read(/proc/apm) failed: %s", strerror(errno)); + fd = -1; + return -1; + } + + beg = buffer; + for (i = 0; i < 9 && beg != NULL; i++) { + while (*beg == ' ') + beg++; + if ((end = strpbrk(beg, " \n"))) + *end = '\0'; + hash_put(&APM, key[i], beg); + beg = end ? end + 1 : NULL; + } + + return 0; +} + + +static void my_apm(RESULT * result, RESULT * arg1) +{ + char *val; + + if (parse_proc_apm() < 0) { + SetResult(&result, R_STRING, ""); + return; + } + + val = hash_get(&APM, R2S(arg1), NULL); + if (val == NULL) + val = ""; + + SetResult(&result, R_STRING, val); +} + +int plugin_init_apm(void) +{ + hash_create(&APM); + + AddFunction("apm", 1, my_apm); + + return 0; +} + +void plugin_exit_apm(void) +{ + if (fd > -1) { + close(fd); + } + fd = -2; + + hash_destroy(&APM); +} |