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