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-rw-r--r--src/radio_impl_null.c279
1 files changed, 279 insertions, 0 deletions
diff --git a/src/radio_impl_null.c b/src/radio_impl_null.c
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--- /dev/null
+++ b/src/radio_impl_null.c
@@ -0,0 +1,279 @@
+/*
+ * Copyright (C) 2017,2018,2020 Konsulko Group
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * NOTE: Some locking around frequency and scanning state may be
+ * required if this null implementation ever needs to be used
+ * beyond basic functionality testing.
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <stdbool.h>
+#include <string.h>
+#include <strings.h>
+#include <unistd.h>
+#include <pthread.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <glib.h>
+
+#include "radio_impl.h"
+
+// Structure to describe FM band plans, all values in Hz.
+typedef struct {
+ char *name;
+ uint32_t min;
+ uint32_t max;
+ uint32_t step;
+} fm_band_plan_t;
+
+static fm_band_plan_t known_fm_band_plans[5] = {
+ { .name = "US", .min = 87900000, .max = 107900000, .step = 200000 },
+ { .name = "JP", .min = 76000000, .max = 95000000, .step = 100000 },
+ { .name = "EU", .min = 87500000, .max = 108000000, .step = 50000 },
+ { .name = "ITU-1", .min = 87500000, .max = 108000000, .step = 50000 },
+ { .name = "ITU-2", .min = 87900000, .max = 107900000, .step = 50000 }
+};
+
+static unsigned int bandplan;
+static bool present;
+static bool initialized;
+static bool active;
+static bool scanning;
+static uint32_t current_frequency;
+static radio_freq_callback_t freq_callback;
+static void *freq_callback_data;
+
+static uint32_t null_get_min_frequency(radio_band_t band);
+static void null_set_frequency(uint32_t frequency);
+
+static int null_probe(void)
+{
+ present = true;
+ return 0;
+}
+
+static int null_init(void)
+{
+ GKeyFile *conf_file;
+ char *value_str;
+
+ if(!present)
+ return -1;
+
+ if(initialized)
+ return 0;
+
+ // Load settings from configuration file if it exists
+ conf_file = g_key_file_new();
+ if(conf_file &&
+ g_key_file_load_from_dirs(conf_file,
+ "AGL.conf",
+ (const gchar**) g_get_system_config_dirs(),
+ NULL,
+ G_KEY_FILE_KEEP_COMMENTS,
+ NULL) == TRUE) {
+
+ // Set band plan if it is specified
+ value_str = g_key_file_get_string(conf_file,
+ "radio",
+ "fmbandplan",
+ NULL);
+ if(value_str) {
+ unsigned int i;
+ for(i = 0;
+ i < sizeof(known_fm_band_plans) / sizeof(fm_band_plan_t);
+ i++) {
+ if(!strcasecmp(value_str, known_fm_band_plans[i].name)) {
+ bandplan = i;
+ break;
+ }
+ }
+ }
+ }
+
+ // Start off with minimum bandplan frequency
+ current_frequency = null_get_min_frequency(RADIO_BAND_FM);
+
+ initialized = true;
+ null_set_frequency(current_frequency);
+
+ return 0;
+}
+
+static void null_set_output(const char *output)
+{
+}
+
+static uint32_t null_get_frequency(void)
+{
+ return current_frequency;
+}
+
+static void null_set_frequency(uint32_t frequency)
+{
+ if(frequency < known_fm_band_plans[bandplan].min ||
+ frequency > known_fm_band_plans[bandplan].max)
+ return;
+
+ current_frequency = frequency;
+
+ if(freq_callback)
+ freq_callback(current_frequency, freq_callback_data);
+}
+
+static void null_set_frequency_callback(radio_freq_callback_t callback,
+ void *data)
+{
+ freq_callback = callback;
+ freq_callback_data = data;
+}
+
+static radio_band_t null_get_band(void)
+{
+ // We only support FM
+ return RADIO_BAND_FM;
+}
+
+static void null_set_band(radio_band_t band)
+{
+ // We only support FM, so do nothing
+}
+
+static int null_band_supported(radio_band_t band)
+{
+ if(band == RADIO_BAND_FM)
+ return 1;
+ return 0;
+}
+
+static uint32_t null_get_min_frequency(radio_band_t band)
+{
+ return known_fm_band_plans[bandplan].min;
+}
+
+static uint32_t null_get_max_frequency(radio_band_t band)
+{
+ return known_fm_band_plans[bandplan].max;
+}
+
+static uint32_t null_get_frequency_step(radio_band_t band)
+{
+ uint32_t ret = 0;
+
+ switch (band) {
+ case RADIO_BAND_AM:
+ ret = 1000; // 1 kHz
+ break;
+ case RADIO_BAND_FM:
+ ret = known_fm_band_plans[bandplan].step;
+ break;
+ default:
+ break;
+ }
+ return ret;
+}
+
+static void null_start(void)
+{
+ if(!initialized)
+ return;
+
+ if(active)
+ return;
+
+ active = true;
+}
+
+static void null_stop(void)
+{
+ if(!initialized)
+ return;
+
+ if (!active)
+ return;
+
+ active = false;
+}
+
+static void null_scan_start(radio_scan_direction_t direction,
+ radio_scan_callback_t callback,
+ void *data)
+{
+ int frequency;
+
+ if(!active || scanning)
+ return;
+
+ scanning = true;
+
+ // Just go to the next frequency step up or down
+ frequency = current_frequency;
+ if(direction == RADIO_SCAN_FORWARD) {
+ frequency += known_fm_band_plans[bandplan].step;
+ } else {
+ frequency -= known_fm_band_plans[bandplan].step;
+ }
+ if(frequency < known_fm_band_plans[bandplan].min)
+ frequency = known_fm_band_plans[bandplan].max;
+ else if(frequency > known_fm_band_plans[bandplan].max)
+ frequency = known_fm_band_plans[bandplan].min;
+
+ scanning = false;
+ null_set_frequency(frequency);
+ if(callback)
+ callback(frequency, data);
+}
+
+static void null_scan_stop(void)
+{
+ scanning = false;
+}
+
+static radio_stereo_mode_t null_get_stereo_mode(void)
+{
+ // We only support stereo
+ return RADIO_MODE_STEREO;
+}
+
+static void null_set_stereo_mode(radio_stereo_mode_t mode)
+{
+ // We only support stereo, so do nothing
+}
+
+radio_impl_ops_t null_impl_ops = {
+ .name = "null/mock radio",
+ .probe = null_probe,
+ .init = null_init,
+ .set_output = null_set_output,
+ .get_frequency = null_get_frequency,
+ .set_frequency = null_set_frequency,
+ .set_frequency_callback = null_set_frequency_callback,
+ .get_band = null_get_band,
+ .set_band = null_set_band,
+ .band_supported = null_band_supported,
+ .get_min_frequency = null_get_min_frequency,
+ .get_max_frequency = null_get_max_frequency,
+ .get_frequency_step = null_get_frequency_step,
+ .start = null_start,
+ .stop = null_stop,
+ .scan_start = null_scan_start,
+ .scan_stop = null_scan_stop,
+ .get_stereo_mode = null_get_stereo_mode,
+ .set_stereo_mode = null_set_stereo_mode
+};