1 /* SPDX-License-Identifier: GPL-2.0 */
2 /* Copyright (C) 2021-2022, Intel Corporation. */
3 
4 #ifndef _ICE_GNSS_H_
5 #define _ICE_GNSS_H_
6 
7 #define ICE_E810T_GNSS_I2C_BUS		0x2
8 #define ICE_GNSS_POLL_DATA_DELAY_TIME	(HZ / 50) /* poll every 20 ms */
9 #define ICE_GNSS_TIMER_DELAY_TIME	(HZ / 10) /* 0.1 second per message */
10 #define ICE_GNSS_TTY_WRITE_BUF		250
11 #define ICE_MAX_I2C_DATA_SIZE		FIELD_MAX(ICE_AQC_I2C_DATA_SIZE_M)
12 #define ICE_MAX_I2C_WRITE_BYTES		4
13 
14 /* u-blox ZED-F9T specific definitions */
15 #define ICE_GNSS_UBX_I2C_BUS_ADDR	0x42
16 /* Data length register is big endian */
17 #define ICE_GNSS_UBX_DATA_LEN_H		0xFD
18 #define ICE_GNSS_UBX_DATA_LEN_WIDTH	2
19 #define ICE_GNSS_UBX_EMPTY_DATA		0xFF
20 /* For u-blox writes are performed without address so the first byte to write is
21  * passed as I2C addr parameter.
22  */
23 #define ICE_GNSS_UBX_WRITE_BYTES	(ICE_MAX_I2C_WRITE_BYTES + 1)
24 
25 struct gnss_write_buf {
26 	struct list_head queue;
27 	unsigned int size;
28 	unsigned char *buf;
29 };
30 
31 /**
32  * struct gnss_serial - data used to initialize GNSS TTY port
33  * @back: back pointer to PF
34  * @kworker: kwork thread for handling periodic work
35  * @read_work: read_work function for handling GNSS reads
36  * @write_work: write_work function for handling GNSS writes
37  * @queue: write buffers queue
38  */
39 struct gnss_serial {
40 	struct ice_pf *back;
41 	struct kthread_worker *kworker;
42 	struct kthread_delayed_work read_work;
43 	struct kthread_work write_work;
44 	struct list_head queue;
45 };
46 
47 #if IS_ENABLED(CONFIG_GNSS)
48 void ice_gnss_init(struct ice_pf *pf);
49 void ice_gnss_exit(struct ice_pf *pf);
50 bool ice_gnss_is_gps_present(struct ice_hw *hw);
51 #else
52 static inline void ice_gnss_init(struct ice_pf *pf) { }
53 static inline void ice_gnss_exit(struct ice_pf *pf) { }
54 static inline bool ice_gnss_is_gps_present(struct ice_hw *hw)
55 {
56 	return false;
57 }
58 #endif /* IS_ENABLED(CONFIG_GNSS) */
59 #endif /* _ICE_GNSS_H_ */
60