mirror of https://github.com/xemu-project/xemu.git
120 lines
3.7 KiB
C
120 lines
3.7 KiB
C
/*
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* QEMU SMBus Microsoft Xcalibur Video Encoder
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*
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* Copyright (c) 2012 espes
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "qemu/osdep.h"
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#include "hw/hw.h"
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#include "hw/qdev-properties.h"
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#include "hw/i2c/i2c.h"
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#include "hw/i2c/smbus_slave.h"
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#include "smbus.h"
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#include "qapi/error.h"
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#define TYPE_SMBUS_xcalibur "smbus-xcalibur"
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#define SMBUS_xcalibur(obj) OBJECT_CHECK(SMBusxcaliburDevice, (obj), TYPE_SMBUS_xcalibur)
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// #define DEBUG
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#ifdef DEBUG
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# define DPRINTF(format, ...) printf(format, ## __VA_ARGS__)
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#else
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# define DPRINTF(format, ...) do { } while (0)
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#endif
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typedef struct SMBusxcaliburDevice {
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SMBusDevice smbusdev;
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uint8_t registers[256];
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uint8_t cmd;
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} SMBusxcaliburDevice;
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static void smbus_xcalibur_quick_cmd(SMBusDevice *dev, uint8_t read)
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{
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DPRINTF("smbus_xcalibur_quick_cmd: addr=0x%02x read=%d\n", dev->i2c.address, read);
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}
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static int smbus_xcalibur_write_data(SMBusDevice *dev, uint8_t *buf, uint8_t len)
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{
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SMBusxcaliburDevice *cx = SMBUS_xcalibur(dev);
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cx->cmd = buf[0];
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uint8_t cmd = cx->cmd;
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buf++;
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len--;
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if (len < 1) return 0;
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DPRINTF("smbus_xcalibur_write_data: addr=0x%02x cmd=0x%02x val=0x%02x\n",
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dev->i2c.address, cmd, buf[0]);
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memcpy(cx->registers + cmd, buf, MIN(len, 256 - cmd));
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return 0;
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}
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static uint8_t smbus_xcalibur_receive_byte(SMBusDevice *dev)
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{
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SMBusxcaliburDevice *cx = SMBUS_xcalibur(dev);
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DPRINTF("smbus_xcalibur_receive_byte: addr=0x%02x cmd=0x%02x\n",
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dev->i2c.address, cx->cmd);
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return cx->registers[cx->cmd++];
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}
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static void smbus_xcalibur_realize(DeviceState *dev, Error **errp)
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{
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SMBusxcaliburDevice *cx = SMBUS_xcalibur(dev);
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memset(cx->registers, 0, 256);
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cx->cmd = 0;
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}
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static void smbus_xcalibur_class_initfn(ObjectClass *klass, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(klass);
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SMBusDeviceClass *sc = SMBUS_DEVICE_CLASS(klass);
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dc->realize = smbus_xcalibur_realize;
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sc->quick_cmd = smbus_xcalibur_quick_cmd;
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sc->receive_byte = smbus_xcalibur_receive_byte;
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sc->write_data = smbus_xcalibur_write_data;
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}
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static TypeInfo smbus_xcalibur_info = {
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.name = TYPE_SMBUS_xcalibur,
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.parent = TYPE_SMBUS_DEVICE,
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.instance_size = sizeof(SMBusxcaliburDevice),
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.class_init = smbus_xcalibur_class_initfn,
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};
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static void smbus_xcalibur_register_devices(void)
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{
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type_register_static(&smbus_xcalibur_info);
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}
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type_init(smbus_xcalibur_register_devices)
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void smbus_xcalibur_init(I2CBus *smbus, int address)
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{
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DeviceState *dev;
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dev = qdev_new(TYPE_SMBUS_xcalibur);
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qdev_prop_set_uint8(dev, "address", address);
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qdev_realize_and_unref(dev, (BusState *)smbus, &error_fatal);
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}
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