75 lines
2.3 KiB
C
75 lines
2.3 KiB
C
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/* SPDX-License-Identifier: GPL-2.0 */
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/* Copyright (C) 2021-2022, Intel Corporation. */
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#ifndef _ICE_GNSS_H_
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#define _ICE_GNSS_H_
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#include <linux/tty.h>
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#include <linux/tty_flip.h>
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#define ICE_E810T_GNSS_I2C_BUS 0x2
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#define ICE_GNSS_TIMER_DELAY_TIME (HZ / 10) /* 0.1 second per message */
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/* Create 2 minor devices, both using the same GNSS module. First one is RW,
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* second one RO.
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*/
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#define ICE_GNSS_TTY_MINOR_DEVICES 2
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#define ICE_GNSS_TTY_WRITE_BUF 250
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#define ICE_MAX_I2C_DATA_SIZE FIELD_MAX(ICE_AQC_I2C_DATA_SIZE_M)
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#define ICE_MAX_I2C_WRITE_BYTES 4
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/* u-blox ZED-F9T specific definitions */
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#define ICE_GNSS_UBX_I2C_BUS_ADDR 0x42
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/* Data length register is big endian */
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#define ICE_GNSS_UBX_DATA_LEN_H 0xFD
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#define ICE_GNSS_UBX_DATA_LEN_WIDTH 2
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#define ICE_GNSS_UBX_EMPTY_DATA 0xFF
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/* For u-blox writes are performed without address so the first byte to write is
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* passed as I2C addr parameter.
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*/
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#define ICE_GNSS_UBX_WRITE_BYTES (ICE_MAX_I2C_WRITE_BYTES + 1)
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#define ICE_MAX_UBX_READ_TRIES 255
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#define ICE_MAX_UBX_ACK_READ_TRIES 4095
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struct gnss_write_buf {
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struct list_head queue;
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unsigned int size;
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unsigned char *buf;
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};
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/**
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* struct gnss_serial - data used to initialize GNSS TTY port
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* @back: back pointer to PF
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* @tty: pointer to the tty for this device
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* @open_count: number of times this port has been opened
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* @gnss_mutex: gnss_mutex used to protect GNSS serial operations
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* @kworker: kwork thread for handling periodic work
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* @read_work: read_work function for handling GNSS reads
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* @write_work: write_work function for handling GNSS writes
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* @queue: write buffers queue
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*/
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struct gnss_serial {
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struct ice_pf *back;
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struct tty_struct *tty;
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int open_count;
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struct mutex gnss_mutex; /* protects GNSS serial structure */
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struct kthread_worker *kworker;
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struct kthread_delayed_work read_work;
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struct kthread_work write_work;
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struct list_head queue;
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};
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#if IS_ENABLED(CONFIG_TTY)
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void ice_gnss_init(struct ice_pf *pf);
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void ice_gnss_exit(struct ice_pf *pf);
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bool ice_gnss_is_gps_present(struct ice_hw *hw);
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#else
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static inline void ice_gnss_init(struct ice_pf *pf) { }
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static inline void ice_gnss_exit(struct ice_pf *pf) { }
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static inline bool ice_gnss_is_gps_present(struct ice_hw *hw)
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{
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return false;
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}
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#endif /* IS_ENABLED(CONFIG_TTY) */
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#endif /* _ICE_GNSS_H_ */
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