iwinfo.c

		if (iw->survey(ifname, buf, &val)) {
			val = 0;
		} else {
			for (int i = 0, x = 1; i < len; i += sizeof(struct iwinfo_survey_entry), x++) {
        	e = (struct iwinfo_survey_entry *) &buf[i];
				if(e->mhz == freq)
				{
					uint64_t dividend = e->busy_time - *last_channel_time_busy;
					uint64_t divisor =  e->active_time - *last_channel_time;
					*last_channel_time = e->active_time;
					*last_channel_time_busy = e->busy_time;

					if(divisor)
						ret = (int)(dividend * 255 / divisor);

					break;
				}
			}
		}