fec2f12ebd
Since drm2 removal, there has not been any consumer of the feature in the tree. I am also unaware of any out-of-tree consumer. More importantly, the feature has been broken from the very start, both before and after r306589, because the ivar was set on a device that does not support it and it was read from another device that also does not support it. A bus-wide no-stop flag cannot be implemented as an ivar as iicbus attaches as a child of various drivers. Implementing the ivar in each and every I2C driver is just impractical. If we ever want to implement this feature properly, then probably the easiest way to do it would be via a flag in the softc of iicbus. In fact, we might have to do that in the stable branches if we want to fix the code for them. Reported by: ian (long time ago) MFC after: 1 month (maybe) X-MFC-note: cannot just merge the change, must keep drm2 happy
87 lines
2.8 KiB
C
87 lines
2.8 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 1998 Nicolas Souchu
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* $FreeBSD$
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*
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*/
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#ifndef __IICBUS_H
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#define __IICBUS_H
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#include <sys/_lock.h>
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#include <sys/_mutex.h>
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#define IICBUS_IVAR(d) (struct iicbus_ivar *) device_get_ivars(d)
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#define IICBUS_SOFTC(d) (struct iicbus_softc *) device_get_softc(d)
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struct iicbus_softc
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{
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device_t dev; /* Myself */
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device_t owner; /* iicbus owner device structure */
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u_int owncount; /* iicbus ownership nesting count */
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u_char started; /* address of the 'started' slave
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* 0 if no start condition succeeded */
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u_char strict; /* deny operations that violate the
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* I2C protocol */
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struct mtx lock;
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u_int bus_freq; /* Configured bus Hz. */
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};
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struct iicbus_ivar
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{
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uint32_t addr;
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struct resource_list rl;
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};
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enum {
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IICBUS_IVAR_ADDR /* Address or base address */
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};
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#define IICBUS_ACCESSOR(A, B, T) \
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__BUS_ACCESSOR(iicbus, A, IICBUS, B, T)
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IICBUS_ACCESSOR(addr, ADDR, uint32_t)
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#define IICBUS_LOCK(sc) mtx_lock(&(sc)->lock)
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#define IICBUS_UNLOCK(sc) mtx_unlock(&(sc)->lock)
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#define IICBUS_ASSERT_LOCKED(sc) mtx_assert(&(sc)->lock, MA_OWNED)
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#ifdef FDT
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#define IICBUS_FDT_PNP_INFO(t) FDTCOMPAT_PNP_INFO(t, iicbus)
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#else
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#define IICBUS_FDT_PNP_INFO(t)
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#endif
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int iicbus_generic_intr(device_t dev, int event, char *buf);
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void iicbus_init_frequency(device_t dev, u_int bus_freq);
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extern driver_t iicbus_driver;
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extern devclass_t iicbus_devclass;
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extern driver_t ofw_iicbus_driver;
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extern devclass_t ofw_iicbus_devclass;
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#endif
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