freebsd-dev/sys/dev/iicbus/iicbus.h
Ian Lepore c5fe9c7b20 Allow i2c hardware drivers to declare their own relationships to ofw_iicbus
rather than relying on a set of canned EARLY_DRIVER_MODULE() statements in
the ofw_iicbus source.  This means hw drivers will no longer be required to
use one of a few predefined driver names.  They will also now be able to
decide themselves if they want to use DRIVER_MODULE or EARLY_DRIVER_MODULE
and to set which pass to attach on for early modules.

Mainly, this adds extern declarations for the driver and devclass variables.
It also renames ofwiicbus_devclass to ofw_iicbus_devclass to be consistant
with the way we use ofw_ prefixes on this stuff.
2018-02-18 19:33:28 +00:00

84 lines
2.8 KiB
C

/*-
* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
*
* Copyright (c) 1998 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 __IICBUS_H
#define __IICBUS_H
#include <sys/_lock.h>
#include <sys/_mutex.h>
#define IICBUS_IVAR(d) (struct iicbus_ivar *) device_get_ivars(d)
#define IICBUS_SOFTC(d) (struct iicbus_softc *) device_get_softc(d)
struct iicbus_softc
{
device_t dev; /* Myself */
device_t owner; /* iicbus owner device structure */
u_int owncount; /* iicbus ownership nesting count */
u_char started; /* address of the 'started' slave
* 0 if no start condition succeeded */
u_char strict; /* deny operations that violate the
* I2C protocol */
struct mtx lock;
u_int bus_freq; /* Configured bus Hz. */
};
struct iicbus_ivar
{
uint32_t addr;
struct resource_list rl;
bool nostop;
};
enum {
IICBUS_IVAR_ADDR, /* Address or base address */
IICBUS_IVAR_NOSTOP, /* nostop defaults */
};
#define IICBUS_ACCESSOR(A, B, T) \
__BUS_ACCESSOR(iicbus, A, IICBUS, B, T)
IICBUS_ACCESSOR(addr, ADDR, uint32_t)
IICBUS_ACCESSOR(nostop, NOSTOP, bool)
#define IICBUS_LOCK(sc) mtx_lock(&(sc)->lock)
#define IICBUS_UNLOCK(sc) mtx_unlock(&(sc)->lock)
#define IICBUS_ASSERT_LOCKED(sc) mtx_assert(&(sc)->lock, MA_OWNED)
int iicbus_generic_intr(device_t dev, int event, char *buf);
void iicbus_init_frequency(device_t dev, u_int bus_freq);
extern driver_t iicbus_driver;
extern devclass_t iicbus_devclass;
extern driver_t ofw_iicbus_driver;
extern devclass_t ofw_iicbus_devclass;
#endif