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/*
* SPI interface.
*
* Copyright (C) 2007-2010 Nokia Corporation
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 or
* (at your option) any later version of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "spi.h"
struct SPIBus {
BusState qbus;
int channels;
SPIDevice **device;
};
#define TYPE_SPI_BUS "spi-bus"
#define SPI_BUS(obj) OBJECT_CHECK(SPIBus, (obj), TYPE_SPI_BUS)
static Property spi_props[] = {
DEFINE_PROP_UINT8("channel", SPIDevice, channel, 0),
DEFINE_PROP_END_OF_LIST()
};
static const TypeInfo spi_bus_info = {
.name = TYPE_SPI_BUS,
.parent = TYPE_BUS,
.instance_size = sizeof(SPIBus),
};
SPIBus *spi_init_bus(DeviceState *parent, const char *name, int num_channels)
{
SPIBus *bus = FROM_QBUS(SPIBus, qbus_create(TYPE_SPI_BUS, parent, name));
bus->channels = num_channels;
bus->device = g_new0(SPIDevice*, bus->channels);
return bus;
}
uint32_t spi_txrx(SPIBus *bus, int channel, uint32_t data, int len)
{
SPIDevice *dev;
SPIDeviceClass *sc;
if (channel < bus->channels) {
if ((dev = bus->device[channel])) {
sc = SPI_DEVICE_GET_CLASS(dev);
if (sc->txrx) {
return sc->txrx(dev, data, len);
}
}
} else {
hw_error("%s: invalid channel %d\n", __FUNCTION__, channel);
}
return 0;
}
DeviceState *spi_create_device_noinit(SPIBus *bus, const char *name, int ch)
{
if (ch >= bus->channels) {
hw_error("%s: invalid channel %d\n", __FUNCTION__, ch);
}
if (bus->device[ch]) {
hw_error("%s: channel %d already has a device attached\n",
__FUNCTION__, ch);
}
DeviceState *qdev = qdev_create(&bus->qbus, name);
qdev_prop_set_uint8(qdev, "channel", ch);
SPIDevice *dev = SPI_DEVICE_FROM_QDEV(qdev);
bus->device[ch] = dev;
return qdev;
}
DeviceState *spi_create_device(SPIBus *bus, const char *name, int ch)
{
DeviceState *dev = spi_create_device_noinit(bus, name, ch);
qdev_init_nofail(dev);
return dev;
}
static int spi_device_qdev_init(DeviceState *dev)
{
SPIDevice *s = SPI_DEVICE_FROM_QDEV(dev);
SPIDeviceClass *sc = SPI_DEVICE_GET_CLASS(s);
return sc->init(s);
}
static void spi_device_class_init(ObjectClass *klass, void *data)
{
DeviceClass *k = DEVICE_CLASS(klass);
k->init = spi_device_qdev_init;
k->bus_type = TYPE_SPI_BUS;
k->props = spi_props;
}
static TypeInfo spi_device_type_info = {
.name = TYPE_SPI_DEVICE,
.parent = TYPE_DEVICE,
.instance_size = sizeof(SPIDevice),
.abstract = true,
.class_size = sizeof(SPIDeviceClass),
.class_init = spi_device_class_init,
};
static void spi_device_register_types(void)
{
type_register_static(&spi_bus_info);
type_register_static(&spi_device_type_info);
}
type_init(spi_device_register_types)
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