[PATCH V2 3/7] net: lorawan: Add LoRaWAN API declaration for LoRa devices

[Jian-Hong Pan <starnight@g.ncu.edu.tw>]

Add public LoRaWAN API for compatible LoRa device drivers.

Signed-off-by: Jian-Hong Pan <starnight@g.ncu.edu.tw>
---
V2:
- Split the LoRaWAN class module patch in V1 into LoRaWAN socket and
  LoRaWAN Soft MAC modules
- Merge the lrw_operations: set_bw, set_mod, set_sf into set_dr
- Use SPDX license identifiers

 include/linux/lora/lorawan.h | 137 +++++++++++++++++++++++++++++++++++
 1 file changed, 137 insertions(+)
 create mode 100644 include/linux/lora/lorawan.h

diff --git a/include/linux/lora/lorawan.h b/include/linux/lora/lorawan.h
new file mode 100644
index 000000000000..684c9e2eb018
--- /dev/null
+++ b/include/linux/lora/lorawan.h
@@ -0,0 +1,137 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later OR BSD-3-Clause */
+/*-
+ * LoRaWAN compatible hardware's definitions
+ *
+ * Copyright (c) 2018 Jian-Hong, Pan <starnight@g.ncu.edu.tw>
+ *
+ */
+
+#ifndef __LORAWAN_H__
+#define __LORAWAN_H__
+
+#include <linux/skbuff.h>
+#include <linux/random.h>
+
+/* List the role of the LoRaWAN hardware */
+enum {
+	LRW_GATEWAY,
+	LRW_CLASS_A_NODE,
+	LRW_CLASS_B_NODE,
+	LRW_CLASS_C_NODE,
+};
+
+/* List the RF modes */
+enum {
+	LRW_LORA,
+	LRW_FSK,
+};
+
+/**
+ * lrw_dr - This structure holds the RF related configuration of the data rate.
+ * @bw:
+ * 	Bandwidth in Hz
+ *
+ * @sf:
+ * 	Spread factor of CSS modulation used by LoRa mode
+ *
+ * @mode:
+ * 	LoRa or FSK mode
+ */
+struct lrw_dr {
+	u32 bw;
+	u8 sf;
+	u8 mode;
+};
+
+#define	LRW_DEVADDR_LEN		(sizeof(__le32))
+
+/* List the LoRa device's states of LoRaWAN hardware */
+enum {
+	LRW_STOP,
+	LRW_START,
+	LRW_STATE_IDLE,
+	LRW_STATE_TX,
+	LRW_STATE_RX,
+};
+
+/**
+ * lrw_hw - This structure holds the LoRa device of LoRaWAN hardware.
+ * @priv:
+ * 	points to the private data of the LoRa device
+ */
+struct lrw_hw {
+	void *priv;
+};
+
+/**
+ * lrw_operations - Lists the LoRaWAN device/interface's operations.
+ * These are callback functions for the LoRaWAN module.  Compatible LoRa device
+ * driver should implement some of them according to the usage.  The
+ * unimplemented callback functions must be assigned as NULL.
+ *
+ * @start:
+ *	called when the interface is being up state
+ *
+ * @stop:
+ *	called when the interface is being down state
+ *
+ * @xmit_async:
+ *	called to xmit the data through the interface asynchronously
+ *
+ * @set_txpower:
+ *	called to set xmitting RF power in mBm of the interface
+ *
+ * @set_frq:
+ *	called to set carrier frequency in Hz of the interface
+ *
+ * @set_dr:
+ *	called to set related RF configuration of the LoRaWAN data rate
+ *
+ * @start_rx_window:
+ *	called to ask the LoRa device open a receiving window
+ *
+ * @set_state:
+ *	called to set the LoRa device's working state
+ */
+struct lrw_operations {
+	int (*start)(struct lrw_hw *);
+	void (*stop)(struct lrw_hw *);
+
+	int (*xmit_async)(struct lrw_hw *, struct sk_buff *);
+	int (*set_txpower)(struct lrw_hw *, s32);
+	int (*set_frq)(struct lrw_hw *, u32);
+	int (*set_dr)(struct lrw_hw *, struct lrw_dr *);
+	int (*start_rx_window)(struct lrw_hw *, u32);
+	int (*set_state)(struct lrw_hw *, u8);
+};
+
+struct lrw_hw *lrw_alloc_hw(size_t, struct lrw_operations *);
+void lrw_free_hw(struct lrw_hw *);
+int lrw_register_hw(struct lrw_hw *);
+void lrw_unregister_hw(struct lrw_hw *);
+void lrw_rx_irqsave(struct lrw_hw *, struct sk_buff *);
+void lrw_xmit_complete(struct lrw_hw *, struct sk_buff *);
+
+static inline void lrw_random_addr(u64 *addr)
+{
+	get_random_bytes(addr, sizeof(u64));
+}
+
+void lrw_set_deveui(struct lrw_hw *, u64);
+u64 lrw_get_deveui(struct lrw_hw *);
+void lrw_set_appeui(struct lrw_hw *, u64);
+u64 lrw_get_appeui(struct lrw_hw *);
+void lrw_set_devaddr(struct lrw_hw *, u32);
+u32 lrw_get_devaddr(struct lrw_hw *);
+
+enum {
+	LRW_APPKEY,
+	LRW_NWKSKEY,
+	LRW_APPSKEY,
+};
+
+#define	LRW_KEY_LEN		16
+
+int lrw_set_key(struct lrw_hw *, u8, u8 *, size_t);
+
+#endif
-- 
2.19.1