mirror of
https://git.FreeBSD.org/src.git
synced 2024-12-24 11:29:10 +00:00
e72f32cd0f
At attach, print the SCL and SDA pin numbers. Remove a stray blank line. Remove the GPIOBUS locking from gpioiic_reset(), it is already called with this lock held. This fixes a crash when you try to scan the iicbus with i2c(8).
288 lines
7.3 KiB
C
288 lines
7.3 KiB
C
/*-
|
|
* Copyright (c) 2009 Oleksandr Tymoshenko <gonzo@freebsd.org>
|
|
* Copyright (c) 2010 Luiz Otavio O Souza
|
|
* 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.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "opt_platform.h"
|
|
|
|
#include <sys/param.h>
|
|
#include <sys/systm.h>
|
|
#include <sys/bus.h>
|
|
#include <sys/conf.h>
|
|
#include <sys/kernel.h>
|
|
#include <sys/module.h>
|
|
|
|
#include <sys/gpio.h>
|
|
#include "gpiobus_if.h"
|
|
|
|
#ifdef FDT
|
|
#include <dev/ofw/ofw_bus.h>
|
|
#include <dev/ofw/ofw_bus_subr.h>
|
|
#include <dev/fdt/fdt_common.h>
|
|
#endif
|
|
|
|
#include <dev/gpio/gpiobusvar.h>
|
|
|
|
#include <dev/iicbus/iiconf.h>
|
|
#include <dev/iicbus/iicbus.h>
|
|
|
|
#include "iicbb_if.h"
|
|
|
|
#define SCL_PIN_DEFAULT 0 /* default index of SCL pin on gpiobus */
|
|
#define SDA_PIN_DEFAULT 1
|
|
|
|
struct gpioiic_softc
|
|
{
|
|
device_t sc_dev;
|
|
device_t sc_busdev;
|
|
int scl_pin;
|
|
int sda_pin;
|
|
};
|
|
|
|
static int gpioiic_probe(device_t);
|
|
static int gpioiic_attach(device_t);
|
|
|
|
/* iicbb interface */
|
|
static void gpioiic_reset_bus(device_t);
|
|
static int gpioiic_callback(device_t, int, caddr_t);
|
|
static void gpioiic_setsda(device_t, int);
|
|
static void gpioiic_setscl(device_t, int);
|
|
static int gpioiic_getsda(device_t);
|
|
static int gpioiic_getscl(device_t);
|
|
static int gpioiic_reset(device_t, u_char, u_char, u_char *);
|
|
|
|
static int
|
|
gpioiic_probe(device_t dev)
|
|
{
|
|
|
|
#ifdef FDT
|
|
if (!ofw_bus_is_compatible(dev, "gpioiic"))
|
|
return (ENXIO);
|
|
#endif
|
|
device_set_desc(dev, "GPIO I2C bit-banging driver");
|
|
|
|
return (0);
|
|
}
|
|
|
|
static int
|
|
gpioiic_attach(device_t dev)
|
|
{
|
|
device_t bitbang;
|
|
#ifdef FDT
|
|
phandle_t node;
|
|
pcell_t pin;
|
|
#endif
|
|
struct gpiobus_ivar *devi;
|
|
struct gpioiic_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
sc->sc_dev = dev;
|
|
sc->sc_busdev = device_get_parent(dev);
|
|
if (resource_int_value(device_get_name(dev),
|
|
device_get_unit(dev), "scl", &sc->scl_pin))
|
|
sc->scl_pin = SCL_PIN_DEFAULT;
|
|
if (resource_int_value(device_get_name(dev),
|
|
device_get_unit(dev), "sda", &sc->sda_pin))
|
|
sc->sda_pin = SDA_PIN_DEFAULT;
|
|
|
|
#ifdef FDT
|
|
if ((node = ofw_bus_get_node(dev)) == -1)
|
|
return (ENXIO);
|
|
if (OF_getencprop(node, "scl", &pin, sizeof(pin)) > 0)
|
|
sc->scl_pin = (int)pin;
|
|
if (OF_getencprop(node, "sda", &pin, sizeof(pin)) > 0)
|
|
sc->sda_pin = (int)pin;
|
|
#endif
|
|
|
|
if (sc->scl_pin < 0 || sc->scl_pin > 1)
|
|
sc->scl_pin = SCL_PIN_DEFAULT;
|
|
if (sc->sda_pin < 0 || sc->sda_pin > 1)
|
|
sc->sda_pin = SDA_PIN_DEFAULT;
|
|
|
|
devi = GPIOBUS_IVAR(dev);
|
|
device_printf(dev, "SCL pin: %d, SDA pin: %d\n",
|
|
devi->pins[sc->scl_pin], devi->pins[sc->sda_pin]);
|
|
|
|
/* add generic bit-banging code */
|
|
bitbang = device_add_child(dev, "iicbb", -1);
|
|
device_probe_and_attach(bitbang);
|
|
|
|
return (0);
|
|
}
|
|
|
|
/*
|
|
* Reset bus by setting SDA first and then SCL.
|
|
* Must always be called with gpio bus locked.
|
|
*/
|
|
static void
|
|
gpioiic_reset_bus(device_t dev)
|
|
{
|
|
struct gpioiic_softc *sc = device_get_softc(dev);
|
|
|
|
GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, sc->sda_pin,
|
|
GPIO_PIN_INPUT);
|
|
GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, sc->scl_pin,
|
|
GPIO_PIN_INPUT);
|
|
}
|
|
|
|
static int
|
|
gpioiic_callback(device_t dev, int index, caddr_t data)
|
|
{
|
|
struct gpioiic_softc *sc = device_get_softc(dev);
|
|
int error = 0;
|
|
|
|
switch (index) {
|
|
case IIC_REQUEST_BUS:
|
|
GPIOBUS_LOCK_BUS(sc->sc_busdev);
|
|
GPIOBUS_ACQUIRE_BUS(sc->sc_busdev, sc->sc_dev);
|
|
GPIOBUS_UNLOCK_BUS(sc->sc_busdev);
|
|
break;
|
|
case IIC_RELEASE_BUS:
|
|
GPIOBUS_LOCK_BUS(sc->sc_busdev);
|
|
GPIOBUS_RELEASE_BUS(sc->sc_busdev, sc->sc_dev);
|
|
GPIOBUS_UNLOCK_BUS(sc->sc_busdev);
|
|
break;
|
|
default:
|
|
error = EINVAL;
|
|
}
|
|
|
|
return (error);
|
|
}
|
|
|
|
static void
|
|
gpioiic_setsda(device_t dev, int val)
|
|
{
|
|
struct gpioiic_softc *sc = device_get_softc(dev);
|
|
|
|
if (val == 0) {
|
|
GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, sc->sda_pin, 0);
|
|
GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, sc->sda_pin,
|
|
GPIO_PIN_OUTPUT);
|
|
} else {
|
|
GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, sc->sda_pin,
|
|
GPIO_PIN_INPUT);
|
|
}
|
|
}
|
|
|
|
static void
|
|
gpioiic_setscl(device_t dev, int val)
|
|
{
|
|
struct gpioiic_softc *sc = device_get_softc(dev);
|
|
|
|
if (val == 0) {
|
|
GPIOBUS_PIN_SET(sc->sc_busdev, sc->sc_dev, sc->scl_pin, 0);
|
|
GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, sc->scl_pin,
|
|
GPIO_PIN_OUTPUT);
|
|
} else {
|
|
GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, sc->scl_pin,
|
|
GPIO_PIN_INPUT);
|
|
}
|
|
}
|
|
|
|
static int
|
|
gpioiic_getscl(device_t dev)
|
|
{
|
|
struct gpioiic_softc *sc = device_get_softc(dev);
|
|
unsigned int val;
|
|
|
|
GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, sc->scl_pin,
|
|
GPIO_PIN_INPUT);
|
|
GPIOBUS_PIN_GET(sc->sc_busdev, sc->sc_dev, sc->scl_pin, &val);
|
|
|
|
return ((int)val);
|
|
}
|
|
|
|
static int
|
|
gpioiic_getsda(device_t dev)
|
|
{
|
|
struct gpioiic_softc *sc = device_get_softc(dev);
|
|
unsigned int val;
|
|
|
|
GPIOBUS_PIN_SETFLAGS(sc->sc_busdev, sc->sc_dev, sc->sda_pin,
|
|
GPIO_PIN_INPUT);
|
|
GPIOBUS_PIN_GET(sc->sc_busdev, sc->sc_dev, sc->sda_pin, &val);
|
|
|
|
return ((int)val);
|
|
}
|
|
|
|
static int
|
|
gpioiic_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr)
|
|
{
|
|
struct gpioiic_softc *sc;
|
|
|
|
sc = device_get_softc(dev);
|
|
gpioiic_reset_bus(sc->sc_dev);
|
|
|
|
return (IIC_ENOADDR);
|
|
}
|
|
|
|
#ifdef FDT
|
|
static phandle_t
|
|
gpioiic_get_node(device_t bus, device_t dev)
|
|
{
|
|
|
|
/* We only have one child, the iicbb, which needs our own node. */
|
|
return (ofw_bus_get_node(bus));
|
|
}
|
|
#endif
|
|
|
|
static devclass_t gpioiic_devclass;
|
|
|
|
static device_method_t gpioiic_methods[] = {
|
|
/* Device interface */
|
|
DEVMETHOD(device_probe, gpioiic_probe),
|
|
DEVMETHOD(device_attach, gpioiic_attach),
|
|
DEVMETHOD(device_detach, bus_generic_detach),
|
|
|
|
/* iicbb interface */
|
|
DEVMETHOD(iicbb_callback, gpioiic_callback),
|
|
DEVMETHOD(iicbb_setsda, gpioiic_setsda),
|
|
DEVMETHOD(iicbb_setscl, gpioiic_setscl),
|
|
DEVMETHOD(iicbb_getsda, gpioiic_getsda),
|
|
DEVMETHOD(iicbb_getscl, gpioiic_getscl),
|
|
DEVMETHOD(iicbb_reset, gpioiic_reset),
|
|
|
|
#ifdef FDT
|
|
/* OFW bus interface */
|
|
DEVMETHOD(ofw_bus_get_node, gpioiic_get_node),
|
|
#endif
|
|
|
|
{ 0, 0 }
|
|
};
|
|
|
|
static driver_t gpioiic_driver = {
|
|
"gpioiic",
|
|
gpioiic_methods,
|
|
sizeof(struct gpioiic_softc),
|
|
};
|
|
|
|
DRIVER_MODULE(gpioiic, gpiobus, gpioiic_driver, gpioiic_devclass, 0, 0);
|
|
DRIVER_MODULE(iicbb, gpioiic, iicbb_driver, iicbb_devclass, 0, 0);
|
|
MODULE_DEPEND(gpioiic, iicbb, IICBB_MINVER, IICBB_PREFVER, IICBB_MAXVER);
|
|
MODULE_DEPEND(gpioiic, gpiobus, 1, 1, 1);
|