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2b8b8321e3
controller. The gpiobus is responsible to keep track of the used pins and serialize the access to pins. Some of these features are important to devices that do not descend directly from gpiobus and as such cannot make use of its features (one classic example is gpioc that is attached to the GPIO controller and could not, until now, make use of the gpiobus locking).
154 lines
3.3 KiB
Objective-C
154 lines
3.3 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 gpio;
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CODE {
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static device_t
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gpio_default_get_bus(void)
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{
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return (NULL);
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}
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static int
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gpio_default_map_gpios(device_t bus, phandle_t dev,
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phandle_t gparent, int gcells, pcell_t *gpios, uint32_t *pin,
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uint32_t *flags)
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{
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/* Propagate up the bus hierarchy until someone handles it. */
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if (device_get_parent(bus) != NULL)
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return (GPIO_MAP_GPIOS(device_get_parent(bus), dev,
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gparent, gcells, gpios, pin, flags));
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/* If that fails, then assume the FreeBSD defaults. */
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*pin = gpios[0];
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if (gcells == 2 || gcells == 3)
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*flags = gpios[gcells - 1];
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return (0);
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}
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};
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HEADER {
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#include <dev/ofw/openfirm.h>
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};
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#
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# Return the gpiobus device reference
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#
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METHOD device_t get_bus {
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device_t dev;
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} DEFAULT gpio_default_get_bus;
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#
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# Get maximum pin number
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#
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METHOD int pin_max {
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device_t dev;
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int *maxpin;
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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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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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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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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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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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uint32_t pin_num;
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uint32_t *flags;
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};
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#
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# Get pin name
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#
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METHOD int pin_getname {
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device_t dev;
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uint32_t pin_num;
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char *name;
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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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uint32_t pin_num;
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uint32_t flags;
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};
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#
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# Allow the GPIO controller to map the gpio-specifier on its own.
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#
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METHOD int map_gpios {
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device_t bus;
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phandle_t dev;
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phandle_t gparent;
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int gcells;
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pcell_t *gpios;
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uint32_t *pin;
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uint32_t *flags;
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} DEFAULT gpio_default_map_gpios;
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