Heinrich Toews
55478b0c37
This is a port of Modbus-RTU / RS485 related changes from 4.9.146 (9520ad8) Signed-off-by: Heinrich Toews <heinrich.toews@wago.com>
67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
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/*
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* WAGO Serial Modbus RTU Driver
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*
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* Copyright (c) 2013 WAGO GmbH & Co. KG
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*
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* Author: Timur Celik <timur.celik@wago.com>
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*
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*/
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#ifndef PFC_MODBUS_RTU_H_
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#define PFC_MODBUS_RTU_H_
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#ifdef CONFIG_SERIAL_OMAP_MODBUS
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#include <asm/atomic.h>
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#include <linux/kfifo.h>
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#include <linux/hrtimer.h>
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#include <linux/interrupt.h>
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#define MB_TIMESTAMP_LENGTH 8
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#define MB_FRAME_MAX 256
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#define MB_FRAME_MIN 4
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/* State machine definition */
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typedef enum { ERR, IF, IC } MB_STATE;
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/* Modbus specific data of the uart port */
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struct modbus_port
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{
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MB_STATE state;
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struct hrtimer timer;
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struct kfifo frame;
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struct kfifo length; /* contains frame length */
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atomic_t ch_cnt;
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atomic_t frame_cnt;
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u8 slave_id; /* if zero all frames are received
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(master mode) */
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u64 to_15;
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u64 to_35;
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u64 to_15_override;
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u64 to_35_override;
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bool activated;
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unsigned int modem_status;
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struct tasklet_struct rx_tsklt;
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struct tasklet_struct tx_tsklt;
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struct tasklet_struct mdr_tsklt;
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bool timestamp_enabled;
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};
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struct uart_omap_port;
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enum hrtimer_restart modbus_omap_to_handler(struct hrtimer* hrt);
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int modbus_omap_rhr_handler(struct uart_omap_port *up);
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int modbus_omap_rlsi_handler(struct uart_omap_port *up, unsigned int lsr);
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void modbus_omap_calc_to(struct uart_omap_port *up, unsigned int baud);
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int modbus_omap_enable(struct uart_omap_port *up);
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int modbus_omap_disable(struct uart_omap_port *up);
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int modbus_omap_startup(struct uart_omap_port *up);
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void modbus_omap_shutdown(struct uart_omap_port *up);
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void modbus_omap_timestamp_enable(struct uart_omap_port *up);
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void modbus_omap_timestamp_disable(struct uart_omap_port *up);
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#endif
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#endif /* PFC_MODBUS_RTU_H_ */
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