9d35acacd3
hold the gpiobus lock between the gpio calls. gpiobus_acquire_lock() now accepts a third parameter which tells gpiobus what to do when the bus is already busy. When GPIOBUS_WAIT wait is used, the calling thread will be put to sleep until the bus became free. With GPIOBUS_DONTWAIT the calling thread will receive EWOULDBLOCK right away and then it can act upon. This fixes the gpioiic(4) locking issues that arises when doing multiple concurrent access on the bus.
109 lines
2.4 KiB
Objective-C
109 lines
2.4 KiB
Objective-C
#-
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# Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
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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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#include <sys/bus.h>
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#include <sys/gpio.h>
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INTERFACE gpiobus;
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#
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# Dedicate the gpio bus control for a child
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#
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METHOD int acquire_bus {
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device_t busdev;
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device_t dev;
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int how;
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};
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#
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# Release the bus
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#
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METHOD void release_bus {
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device_t busdev;
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device_t dev;
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};
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#
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# Set value of pin specifed by pin_num
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#
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METHOD int pin_set {
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device_t dev;
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device_t child;
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uint32_t pin_num;
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uint32_t pin_value;
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};
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#
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# Get value of pin specifed by pin_num
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#
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METHOD int pin_get {
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device_t dev;
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device_t child;
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uint32_t pin_num;
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uint32_t *pin_value;
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};
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#
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# Toggle value of pin specifed by pin_num
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#
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METHOD int pin_toggle {
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device_t dev;
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device_t child;
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uint32_t pin_num;
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};
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#
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# Get pin capabilities
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#
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METHOD int pin_getcaps {
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device_t dev;
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device_t child;
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uint32_t pin_num;
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uint32_t *caps;
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};
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#
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# Get pin flags
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#
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METHOD int pin_getflags {
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device_t dev;
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device_t child;
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uint32_t pin_num;
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uint32_t *flags;
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};
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#
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# Set current configuration and capabilities
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#
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METHOD int pin_setflags {
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device_t dev;
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device_t child;
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uint32_t pin_num;
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uint32_t flags;
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};
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