/*
* Copyright (c) 2019 Vijay Kumar Banerjee <vijaykumar9597@gmail.com>.
* 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 <machine/rtems-bsd-kernel-space.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <fcntl.h>
#include <sys/module.h>
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/errno.h>
#include <sys/bus.h>
#include <dev/iicbus/iicbus.h>
#include <dev/iicbus/iic.h>
#include <dev/iicbus/iiconf.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include <dev/ofw/openfirm.h>
#include <rtems/bsd/local/iicbus_if.h>
#include <linux/i2c.h>
#include <linux/i2c-dev.h>
typedef struct i2c_msg i2c_msg;
struct i2c_softc {
device_t dev;
device_t sc_iicbus;
char *path;
};
static int
rtems_i2c_probe(device_t dev)
{
if (!ofw_bus_status_okay(dev)) {
return (ENXIO);
}
if (!ofw_bus_is_compatible(dev, "rtems,bsp-i2c")){
return (ENXIO);
}
device_set_desc(dev, "RTEMS libbsd I2C");
return (BUS_PROBE_SPECIFIC);
}
static int
rtems_i2c_attach(device_t dev)
{
phandle_t node;
ssize_t compatlen;
char *compat;
char *curstr;
struct i2c_softc *sc;
int len;
sc = device_get_softc(dev);
sc->dev = dev;
node = ofw_bus_get_node(sc->dev);
len = OF_getprop_alloc(node, "rtems,i2c-path", &sc->path);
if (len == -1){
device_printf(sc->dev, "Path not found in Device Tree");
OF_prop_free(sc->path);
return (ENXIO);
}
if ((sc->sc_iicbus = device_add_child(sc->dev, "iicbus", -1)) == NULL) {
device_printf(sc->dev, "could not allocate iicbus instance\n");
OF_prop_free(sc->path);
return (ENXIO);
}
config_intrhook_oneshot((ich_func_t)bus_generic_attach, sc->dev);
return (0);
}
static int
rtems_i2c_detach(device_t dev)
{
struct i2c_softc *sc;
int error;
sc = device_get_softc(dev);
if ((error = bus_generic_detach(sc->dev)) != 0) {
device_printf(sc->dev, "cannot detach child devices\n");
return (error);
}
if (sc->sc_iicbus && (error = device_delete_child(dev, sc->sc_iicbus)) != 0)
return (error);
OF_prop_free(sc->path);
return (0);
}
static int
rtems_i2c_transfer(device_t dev, struct iic_msg *msgs, u_int num)
{
i2c_msg *messages;
int err = 0;
int fd;
char *addr;
struct i2c_softc *sc;
struct i2c_rdwr_ioctl_data ioctl_data;
uint16_t newflags = 0;
sc = device_get_softc(dev);
/* Open /dev/iic0 */
fd = open(sc->path, O_RDWR);
if (fd < 0) {
device_printf(sc->dev, "RTEMS I2C device could not be opened ");
return errno;
}
/* cast iic_msg to i2c_msg */
messages = (i2c_msg *) msgs;
for(int i = 0; i < num; ++i){
messages[i].addr = messages[i].addr >> 1;
if (messages[i].flags & IIC_M_RD){
newflags |= I2C_M_RD;
}
else if ((messages[i].flags & IIC_M_NOSTOP) == 0){
newflags |= I2C_M_STOP;
}
else if (messages[i].flags & IIC_M_NOSTART){
newflags |= I2C_M_NOSTART;
}
else
newflags = 0;
messages[i].flags = newflags;
}
ioctl_data.msgs = messages;
ioctl_data.nmsgs = num;
/* IOCTL call to write */
err = ioctl(fd, I2C_RDWR, &ioctl_data);
if (err == -1) {
err = errno;
}
/* Close the device */
close(fd);
return (err);
}
static int
rtems_i2c_reset(device_t dev, u_char speed, u_char addr, u_char *oldaddr)
{
return (0);
}
static phandle_t
rtems_i2c_get_node(device_t bus, device_t dev)
{
/* Share controller node with iibus device. */
return (ofw_bus_get_node(bus));
}
static device_method_t rtems_i2c_methods[] = {
/* Device Interface */
DEVMETHOD(device_probe, rtems_i2c_probe),
DEVMETHOD(device_attach, rtems_i2c_attach),
DEVMETHOD(device_detach, rtems_i2c_detach),
/* Bus interface */
DEVMETHOD(bus_setup_intr, bus_generic_setup_intr),
DEVMETHOD(bus_teardown_intr, bus_generic_teardown_intr),
DEVMETHOD(bus_alloc_resource, bus_generic_alloc_resource),
DEVMETHOD(bus_release_resource, bus_generic_release_resource),
DEVMETHOD(bus_activate_resource, bus_generic_activate_resource),
DEVMETHOD(bus_deactivate_resource, bus_generic_deactivate_resource),
DEVMETHOD(bus_adjust_resource, bus_generic_adjust_resource),
DEVMETHOD(bus_set_resource, bus_generic_rl_set_resource),
DEVMETHOD(bus_get_resource, bus_generic_rl_get_resource),
/* OFW methods */
DEVMETHOD(ofw_bus_get_node, rtems_i2c_get_node),
/* iicbus interface */
DEVMETHOD(iicbus_callback, iicbus_null_callback),
DEVMETHOD(iicbus_reset, rtems_i2c_reset),
DEVMETHOD(iicbus_transfer, rtems_i2c_transfer),
DEVMETHOD_END
};
static driver_t rtems_i2c_driver = {
"rtems_i2c",
rtems_i2c_methods,
sizeof(struct i2c_softc),
};
static devclass_t rtems_i2c_devclass;
DRIVER_MODULE(rtems_i2c, simplebus, rtems_i2c_driver, rtems_i2c_devclass, 0, 0);
DRIVER_MODULE(iicbus, rtems_i2c, iicbus_driver, iicbus_devclass, 0, 0);
DRIVER_MODULE(ofw_iicbus, rtems_i2c, ofw_iicbus_driver, ofw_iicbus_devclass, 0, 0);
