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00030 #include "asterisk.h"
00031
00032 ASTERISK_FILE_VERSION(__FILE__, "$Revision: 179939 $");
00033
00034 #include <sys/types.h>
00035 #include <sys/stat.h>
00036 #include <fcntl.h>
00037 #include <math.h>
00038
00039 #include <dahdi/user.h>
00040
00041 #include "asterisk/module.h"
00042 #include "asterisk/timing.h"
00043 #include "asterisk/utils.h"
00044
00045 static void *timing_funcs_handle;
00046
00047 static int dahdi_timer_open(void);
00048 static void dahdi_timer_close(int handle);
00049 static int dahdi_timer_set_rate(int handle, unsigned int rate);
00050 static void dahdi_timer_ack(int handle, unsigned int quantity);
00051 static int dahdi_timer_enable_continuous(int handle);
00052 static int dahdi_timer_disable_continuous(int handle);
00053 static enum ast_timer_event dahdi_timer_get_event(int handle);
00054 static unsigned int dahdi_timer_get_max_rate(int handle);
00055
00056 static struct ast_timing_interface dahdi_timing = {
00057 .name = "DAHDI",
00058 .priority = 100,
00059 .timer_open = dahdi_timer_open,
00060 .timer_close = dahdi_timer_close,
00061 .timer_set_rate = dahdi_timer_set_rate,
00062 .timer_ack = dahdi_timer_ack,
00063 .timer_enable_continuous = dahdi_timer_enable_continuous,
00064 .timer_disable_continuous = dahdi_timer_disable_continuous,
00065 .timer_get_event = dahdi_timer_get_event,
00066 .timer_get_max_rate = dahdi_timer_get_max_rate,
00067 };
00068
00069 static int dahdi_timer_open(void)
00070 {
00071 return open("/dev/dahdi/timer", O_RDWR);
00072 }
00073
00074 static void dahdi_timer_close(int handle)
00075 {
00076 close(handle);
00077 }
00078
00079 static int dahdi_timer_set_rate(int handle, unsigned int rate)
00080 {
00081 int samples;
00082
00083
00084
00085 samples = (unsigned int) roundf((8000.0 / ((float) rate)));
00086
00087 if (ioctl(handle, DAHDI_TIMERCONFIG, &samples)) {
00088 ast_log(LOG_ERROR, "Failed to configure DAHDI timing fd for %u sample timer ticks\n",
00089 samples);
00090 return -1;
00091 }
00092
00093 return 0;
00094 }
00095
00096 static void dahdi_timer_ack(int handle, unsigned int quantity)
00097 {
00098 ioctl(handle, DAHDI_TIMERACK, &quantity);
00099 }
00100
00101 static int dahdi_timer_enable_continuous(int handle)
00102 {
00103 int flags = 1;
00104
00105 return ioctl(handle, DAHDI_TIMERPING, &flags) ? -1 : 0;
00106 }
00107
00108 static int dahdi_timer_disable_continuous(int handle)
00109 {
00110 int flags = -1;
00111
00112 return ioctl(handle, DAHDI_TIMERPONG, &flags) ? -1 : 0;
00113 }
00114
00115 static enum ast_timer_event dahdi_timer_get_event(int handle)
00116 {
00117 int res;
00118 int event;
00119
00120 res = ioctl(handle, DAHDI_GETEVENT, &event);
00121
00122 if (res) {
00123 event = DAHDI_EVENT_TIMER_EXPIRED;
00124 }
00125
00126 switch (event) {
00127 case DAHDI_EVENT_TIMER_PING:
00128 return AST_TIMING_EVENT_CONTINUOUS;
00129 case DAHDI_EVENT_TIMER_EXPIRED:
00130 default:
00131 return AST_TIMING_EVENT_EXPIRED;
00132 }
00133 }
00134
00135 static unsigned int dahdi_timer_get_max_rate(int handle)
00136 {
00137 return 1000;
00138 }
00139
00140 #define SEE_TIMING "For more information on Asterisk timing modules, including ways to potentially fix this problem, please see doc/timing.txt\n"
00141
00142 static int dahdi_test_timer(void)
00143 {
00144 int fd;
00145 int x = 160;
00146
00147 fd = open("/dev/dahdi/timer", O_RDWR);
00148
00149 if (fd < 0) {
00150 return -1;
00151 }
00152
00153 if (ioctl(fd, DAHDI_TIMERCONFIG, &x)) {
00154 ast_log(LOG_ERROR, "You have DAHDI built and drivers loaded, but the DAHDI timer test failed to set DAHDI_TIMERCONFIG to %d.\n" SEE_TIMING, x);
00155 close(fd);
00156 return -1;
00157 }
00158
00159 if ((x = ast_wait_for_input(fd, 300)) < 0) {
00160 ast_log(LOG_ERROR, "You have DAHDI built and drivers loaded, but the DAHDI timer could not be polled during the DAHDI timer test.\n" SEE_TIMING);
00161 close(fd);
00162 return -1;
00163 }
00164
00165 if (!x) {
00166 const char dahdi_timer_error[] = {
00167 "Asterisk has detected a problem with your DAHDI configuration and will shutdown for your protection. You have options:"
00168 "\n\t1. You only have to compile DAHDI support into Asterisk if you need it. One option is to recompile without DAHDI support."
00169 "\n\t2. You only have to load DAHDI drivers if you want to take advantage of DAHDI services. One option is to unload DAHDI modules if you don't need them."
00170 "\n\t3. If you need DAHDI services, you must correctly configure DAHDI."
00171 };
00172 ast_log(LOG_ERROR, "%s\n" SEE_TIMING, dahdi_timer_error);
00173 usleep(100);
00174 close(fd);
00175 return -1;
00176 }
00177
00178 close(fd);
00179
00180 return 0;
00181 }
00182
00183 static int load_module(void)
00184 {
00185 if (dahdi_test_timer()) {
00186 return AST_MODULE_LOAD_DECLINE;
00187 }
00188
00189 return (timing_funcs_handle = ast_register_timing_interface(&dahdi_timing)) ?
00190 AST_MODULE_LOAD_SUCCESS : AST_MODULE_LOAD_DECLINE;
00191 }
00192
00193 static int unload_module(void)
00194 {
00195 return ast_unregister_timing_interface(timing_funcs_handle);
00196 }
00197
00198 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "DAHDI Timing Interface");