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 #include <linux/tty.h> 8 #include <linux/tty_flip.h> 9 10 #define ICE_E810T_GNSS_I2C_BUS 0x2 11 #define ICE_GNSS_TIMER_DELAY_TIME (HZ / 10) /* 0.1 second per message */ 12 /* Create 2 minor devices, both using the same GNSS module. First one is RW, 13 * second one RO. 14 */ 15 #define ICE_GNSS_TTY_MINOR_DEVICES 2 16 #define ICE_GNSS_TTY_WRITE_BUF 250 17 #define ICE_MAX_I2C_DATA_SIZE FIELD_MAX(ICE_AQC_I2C_DATA_SIZE_M) 18 #define ICE_MAX_I2C_WRITE_BYTES 4 19 20 /* u-blox ZED-F9T specific definitions */ 21 #define ICE_GNSS_UBX_I2C_BUS_ADDR 0x42 22 /* Data length register is big endian */ 23 #define ICE_GNSS_UBX_DATA_LEN_H 0xFD 24 #define ICE_GNSS_UBX_DATA_LEN_WIDTH 2 25 #define ICE_GNSS_UBX_EMPTY_DATA 0xFF 26 /* For u-blox writes are performed without address so the first byte to write is 27 * passed as I2C addr parameter. 28 */ 29 #define ICE_GNSS_UBX_WRITE_BYTES (ICE_MAX_I2C_WRITE_BYTES + 1) 30 #define ICE_MAX_UBX_READ_TRIES 255 31 #define ICE_MAX_UBX_ACK_READ_TRIES 4095 32 33 struct gnss_write_buf { 34 struct list_head queue; 35 unsigned int size; 36 unsigned char *buf; 37 }; 38 39 40 /** 41 * struct gnss_serial - data used to initialize GNSS TTY port 42 * @back: back pointer to PF 43 * @tty: pointer to the tty for this device 44 * @open_count: number of times this port has been opened 45 * @gnss_mutex: gnss_mutex used to protect GNSS serial operations 46 * @kworker: kwork thread for handling periodic work 47 * @read_work: read_work function for handling GNSS reads 48 * @write_work: write_work function for handling GNSS writes 49 * @queue: write buffers queue 50 */ 51 struct gnss_serial { 52 struct ice_pf *back; 53 struct tty_struct *tty; 54 int open_count; 55 struct mutex gnss_mutex; /* protects GNSS serial structure */ 56 struct kthread_worker *kworker; 57 struct kthread_delayed_work read_work; 58 struct kthread_work write_work; 59 struct list_head queue; 60 }; 61 62 #if IS_ENABLED(CONFIG_TTY) 63 void ice_gnss_init(struct ice_pf *pf); 64 void ice_gnss_exit(struct ice_pf *pf); 65 bool ice_gnss_is_gps_present(struct ice_hw *hw); 66 #else 67 static inline void ice_gnss_init(struct ice_pf *pf) { } 68 static inline void ice_gnss_exit(struct ice_pf *pf) { } 69 static inline bool ice_gnss_is_gps_present(struct ice_hw *hw) 70 { 71 return false; 72 } 73 #endif /* IS_ENABLED(CONFIG_TTY) */ 74 #endif /* _ICE_GNSS_H_ */ 75