app: document the internal API

Document the internal API of the CANnectivity firmware.

Signed-off-by: Henrik Brix Andersen <[email protected]>

app/src/cannectivity.h

@@ -11,34 +11,122 @@
 #include <zephyr/devicetree.h>
 #include <cannectivity/usb/class/gs_usb.h>
 
+/**
+ * @brief The CANnectivity devicetree hardware configuration node identifier
+ */
 #define CANNECTIVITY_DT_NODE_ID DT_NODELABEL(cannectivity)
 
+/**
+ * @brief True if one or more CANnectivity channels are present in the devicetree, false otherwise
+ */
 #define CANNECTIVITY_DT_HAS_CHANNEL DT_HAS_COMPAT_STATUS_OKAY(cannectivity_channel)
 
+/**
+ * @brief Invokes @p fn for each CANnectivity devicetree channel node with a separator
+ *
+ * The macro @p fn must take one parameter, which will be the node identifier of a CANnectivity
+ * channel node.
+ *
+ * @param fn The macro to invoke.
+ * @param sep Separator (e.g. comma or semicolon). Must be in parentheses;
+ *            this is required to enable providing a comma as separator.
+ */
 #define CANNECTIVITY_DT_FOREACH_CHANNEL_SEP(fn, sep)                                               \
 	DT_FOREACH_CHILD_STATUS_OKAY_SEP(CANNECTIVITY_DT_NODE_ID, fn, sep)
 
+/**
+ * @brief CANnectivity CAN channel LED identify callback
+ *
+ * @param dev Pointer to the device structure for the driver instance.
+ * @param ch CAN channel number.
+ * @param identify True if the channel identify is active, false otherwise.
+ * @param user_data User data provided when registering the callback.
+ * @return 0 on success, negative error number otherwise.
+ */
 int cannectivity_led_identify(const struct device *dev, uint16_t ch, bool identify,
 			      void *user_data);
 
+/**
+ * @brief CANnectivity CAN channel LED state callback
+ *
+ * @param dev Pointer to the device structure for the driver instance.
+ * @param ch CAN channel number.
+ * @param started True if the channel is started, false otherwise.
+ * @param user_data User data provided when registering the callback.
+ * @return 0 on success, negative error number otherwise.
+ */
 int cannectivity_led_state(const struct device *dev, uint16_t ch, bool started, void *user_data);
 
+/**
+ * @brief CANnectivity CAN channel LED activity callback
+ *
+ * @param dev Pointer to the device structure for the driver instance.
+ * @param ch CAN channel number.
+ * @param user_data User data provided when registering the callback.
+ * @return 0 on success, negative error number otherwise.
+ */
 int cannectivity_led_activity(const struct device *dev, uint16_t ch, void *user_data);
 
+/**
+ * @brief CANnectivity LED initialization function
+ *
+ * @return 0 on success, negative error number otherwise.
+ */
 int cannectivity_led_init(void);
 
+/**
+ * @brief CANnectivity CAN channel set CAN bus termination callback
+ *
+ * @param dev Pointer to the device structure for the driver instance.
+ * @param ch CAN channel number.
+ * @param terminate True if the channel termination is active, false otherwise.
+ * @param user_data User data provided when registering the callback.
+ * @return 0 on success, negative error number otherwise.
+ */
 int cannectivity_set_termination(const struct device *dev, uint16_t ch, bool terminate,
 				 void *user_data);
 
+/**
+ * @brief CANnectivity CAN channel get CAN bus termination callback
+ *
+ * @param dev Pointer to the device structure for the driver instance.
+ * @param ch CAN channel number.
+ * @param[out] terminated True if the channel termination is active, false otherwise.
+ * @param user_data User data provided when registering the callback.
+ * @return 0 on success, negative error number otherwise.
+ */
 int cannectivity_get_termination(const struct device *dev, uint16_t ch, bool *terminated,
 				 void *user_data);
 
+/**
+ * @brief CANnectivity CAN bus termination initialization function
+ *
+ * @return 0 on success, negative error number otherwise.
+ */
 int cannectivity_termination_init(void);
 
+/**
+ * @brief CANnectivity get hardware timestamp callback
+ *
+ * @param dev Pointer to the device structure for the driver instance.
+ * @param[out] timestamp Current timestamp value.
+ * @param user_data User data provided when registering the callback.
+ * @return 0 on success, negative error number otherwise.
+ */
 int cannectivity_timestamp_get(const struct device *dev, uint32_t *timestamp, void *user_data);
 
+/**
+ * @brief CANnectivity hardware timestamp initialization function
+ *
+ * @return 0 on success, negative error number otherwise.
+ */
 int cannectivity_timestamp_init(void);
 
+/**
+ * @brief CANnectivity USB device initialization function
+ *
+ * @return 0 on success, negative error number otherwise.
+ */
 int cannectivity_usb_init(void);
 
 #endif /* CANNECTIVITY_APP_CANNECTIVITY_H_ */