diff options
Diffstat (limited to 'plugin_dvb.c')
| -rw-r--r-- | plugin_dvb.c | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/plugin_dvb.c b/plugin_dvb.c new file mode 100644 index 0000000..36d515a --- /dev/null +++ b/plugin_dvb.c @@ -0,0 +1,169 @@ +/* $Id: plugin_dvb.c 939 2009-01-04 14:14:31Z michael $ + * $URL: https://ssl.bulix.org/svn/lcd4linux/trunk/plugin_dvb.c $ + * + * plugin for DVB status + * + * Copyright (C) 2003 Michael Reinelt <michael@reinelt.co.at> + * Copyright (C) 2004 The LCD4Linux Team <lcd4linux-devel@users.sourceforge.net> + * + * 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_dvb (void) + * adds dvb() 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> + +#ifdef HAVE_LINUX_DVB_FRONTEND_H +#include <linux/dvb/frontend.h> +#else +#warning linux/dvb/frontend.h not found: using hardcoded ioctl definitions +#define FE_READ_BER _IOR('o', 70, __u32) +#define FE_READ_SIGNAL_STRENGTH _IOR('o', 71, __u16) +#define FE_READ_SNR _IOR('o', 72, __u16) +#define FE_READ_UNCORRECTED_BLOCKS _IOR('o', 73, __u32) +#endif + +#include "debug.h" +#include "plugin.h" +#include "hash.h" + +static char *frontend = "/dev/dvb/adapter0/frontend0"; + +static HASH DVB; + +static int get_dvb_stats(void) +{ + static int ioc_disable = 0; + + int age; + int fd; + unsigned short snr, sig; + unsigned long ber, ucb; + char val[16]; + + /* reread every 1000 msec only */ + age = hash_age(&DVB, NULL); + if (age > 0 && age <= 1000) + return 0; + + /* open frontend */ + fd = open(frontend, O_RDONLY); + if (fd == -1) { + error("open(%s) failed: %s", frontend, strerror(errno)); + return -1; + } + + sig = 0; + if ((ioc_disable & 0x01) == 0 && ioctl(fd, FE_READ_SIGNAL_STRENGTH, &sig) != 0) { + error("ioctl(FE_READ_SIGNAL_STRENGTH) failed: %s", strerror(errno)); + if (errno == ENOSYS) { + ioc_disable |= 0x01; + error("ioctl(FE_READ_SIGNAL_STRENGTH) disabled."); + } + } + + snr = 0; + if ((ioc_disable & 0x02) == 0 && ioctl(fd, FE_READ_SNR, &snr) != 0) { + error("ioctl(FE_READ_SNR) failed: %s", strerror(errno)); + if (errno == ENOSYS) { + ioc_disable |= 0x02; + error("ioctl(FE_READ_SNR) disabled."); + } + } + + ber = 0; + if ((ioc_disable & 0x04) == 0 && ioctl(fd, FE_READ_BER, &ber) != 0) { + error("ioctl(FE_READ_BER) failed: %s", strerror(errno)); + if (errno == ENOSYS) { + ioc_disable |= 0x04; + error("ioctl(FE_READ_BER) disabled."); + } + } + + ucb = 0; + if ((ioc_disable & 0x08) == 0 && ioctl(fd, FE_READ_UNCORRECTED_BLOCKS, &ucb) != 0) { + error("ioctl(FE_READ_UNCORRECTED_BLOCKS) failed: %s", strerror(errno)); + if (errno == ENOSYS) { + ioc_disable |= 0x08; + error("ioctl(FE_READ_UNCORRECTED_BLOCKS) disabled."); + } + } + + close(fd); + + snprintf(val, sizeof(val), "%f", sig / 65535.0); + hash_put(&DVB, "signal_strength", val); + + snprintf(val, sizeof(val), "%f", snr / 65535.0); + hash_put(&DVB, "snr", val); + + snprintf(val, sizeof(val), "%lu", ber); + hash_put(&DVB, "ber", val); + + snprintf(val, sizeof(val), "%lu", ucb); + hash_put(&DVB, "uncorrected_blocks", val); + + return 0; +} + + +static void my_dvb(RESULT * result, RESULT * arg1) +{ + char *val; + + if (get_dvb_stats() < 0) { + SetResult(&result, R_STRING, ""); + return; + } + + val = hash_get(&DVB, R2S(arg1), NULL); + if (val == NULL) + val = ""; + + SetResult(&result, R_STRING, val); +} + + +int plugin_init_dvb(void) +{ + hash_create(&DVB); + AddFunction("dvb", 1, my_dvb); + return 0; +} + + +void plugin_exit_dvb(void) +{ + hash_destroy(&DVB); +} |