4c1e5d32b2
while holding exclusive ownership of the bus. This is the routine most slave drivers should use unless they have a need to acquire and hold the bus across a series of related operations that involves multiple transfers.
150 lines
4.9 KiB
C
150 lines
4.9 KiB
C
/*-
|
|
* Copyright (c) 1998, 2001 Nicolas Souchu
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
#ifndef __IICONF_H
|
|
#define __IICONF_H
|
|
|
|
#include <sys/queue.h>
|
|
#include <dev/iicbus/iic.h>
|
|
|
|
|
|
#define IICPRI (PZERO+8) /* XXX sleep/wakeup queue priority */
|
|
|
|
#define LSB 0x1
|
|
|
|
/*
|
|
* How tsleep() is called in iic_request_bus().
|
|
*/
|
|
#define IIC_DONTWAIT 0
|
|
#define IIC_NOINTR 0
|
|
#define IIC_WAIT 0x1
|
|
#define IIC_INTR 0x2
|
|
#define IIC_INTRWAIT (IIC_INTR | IIC_WAIT)
|
|
|
|
/*
|
|
* i2c modes
|
|
*/
|
|
#define IIC_MASTER 0x1
|
|
#define IIC_SLAVE 0x2
|
|
#define IIC_POLLED 0x4
|
|
|
|
/*
|
|
* i2c speed
|
|
*/
|
|
#define IIC_UNKNOWN 0x0
|
|
#define IIC_SLOW 0x1
|
|
#define IIC_FAST 0x2
|
|
#define IIC_FASTEST 0x3
|
|
|
|
#define IIC_LAST_READ 0x1
|
|
|
|
/*
|
|
* callback index
|
|
*/
|
|
#define IIC_REQUEST_BUS 0x1
|
|
#define IIC_RELEASE_BUS 0x2
|
|
|
|
/*
|
|
* interrupt events
|
|
*/
|
|
#define INTR_GENERAL 0x1 /* general call received */
|
|
#define INTR_START 0x2 /* the I2C interface is addressed */
|
|
#define INTR_STOP 0x3 /* stop condition received */
|
|
#define INTR_RECEIVE 0x4 /* character received */
|
|
#define INTR_TRANSMIT 0x5 /* character to transmit */
|
|
#define INTR_ERROR 0x6 /* error */
|
|
#define INTR_NOACK 0x7 /* no ack from master receiver */
|
|
|
|
/*
|
|
* adapter layer errors
|
|
*/
|
|
#define IIC_NOERR 0x0 /* no error occured */
|
|
#define IIC_EBUSERR 0x1 /* bus error (hardware not in expected state) */
|
|
#define IIC_ENOACK 0x2 /* ack not received until timeout */
|
|
#define IIC_ETIMEOUT 0x3 /* timeout */
|
|
#define IIC_EBUSBSY 0x4 /* bus busy (reserved by another client) */
|
|
#define IIC_ESTATUS 0x5 /* status error */
|
|
#define IIC_EUNDERFLOW 0x6 /* slave ready for more data */
|
|
#define IIC_EOVERFLOW 0x7 /* too much data */
|
|
#define IIC_ENOTSUPP 0x8 /* request not supported */
|
|
#define IIC_ENOADDR 0x9 /* no address assigned to the interface */
|
|
#define IIC_ERESOURCE 0xa /* resources (memory, whatever) unavailable */
|
|
|
|
/*
|
|
* Note that all iicbus functions return IIC_Exxxxx status values,
|
|
* except iic2errno() (obviously) and iicbus_started() (returns bool).
|
|
*/
|
|
extern int iic2errno(int);
|
|
extern int iicbus_request_bus(device_t, device_t, int);
|
|
extern int iicbus_release_bus(device_t, device_t);
|
|
extern device_t iicbus_alloc_bus(device_t);
|
|
|
|
extern void iicbus_intr(device_t, int, char *);
|
|
|
|
extern int iicbus_null_repeated_start(device_t, u_char);
|
|
extern int iicbus_null_callback(device_t, int, caddr_t);
|
|
|
|
#define iicbus_reset(bus,speed,addr,oldaddr) \
|
|
(IICBUS_RESET(device_get_parent(bus), speed, addr, oldaddr))
|
|
|
|
/* basic I2C operations */
|
|
extern int iicbus_started(device_t);
|
|
extern int iicbus_start(device_t, u_char, int);
|
|
extern int iicbus_stop(device_t);
|
|
extern int iicbus_repeated_start(device_t, u_char, int);
|
|
extern int iicbus_write(device_t, const char *, int, int *, int);
|
|
extern int iicbus_read(device_t, char *, int, int *, int, int);
|
|
|
|
/* single byte read/write functions, start/stop not managed */
|
|
extern int iicbus_write_byte(device_t, char, int);
|
|
extern int iicbus_read_byte(device_t, char *, int);
|
|
|
|
/* Read/write operations with start/stop conditions managed */
|
|
extern int iicbus_block_write(device_t, u_char, char *, int, int *);
|
|
extern int iicbus_block_read(device_t, u_char, char *, int, int *);
|
|
|
|
/* vectors of iic operations to pass to bridge */
|
|
int iicbus_transfer(device_t bus, struct iic_msg *msgs, uint32_t nmsgs);
|
|
int iicbus_transfer_excl(device_t bus, struct iic_msg *msgs, uint32_t nmsgs,
|
|
int how);
|
|
int iicbus_transfer_gen(device_t bus, struct iic_msg *msgs, uint32_t nmsgs);
|
|
|
|
#define IICBUS_MODVER 1
|
|
#define IICBUS_MINVER 1
|
|
#define IICBUS_MAXVER 1
|
|
#define IICBUS_PREFVER IICBUS_MODVER
|
|
|
|
extern driver_t iicbb_driver;
|
|
extern devclass_t iicbb_devclass;
|
|
|
|
#define IICBB_MODVER 1
|
|
#define IICBB_MINVER 1
|
|
#define IICBB_MAXVER 1
|
|
#define IICBB_PREFVER IICBB_MODVER
|
|
|
|
#endif
|