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qemu/hw/input/adb.c

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/*
* QEMU ADB support
*
* Copyright (c) 2004 Fabrice Bellard
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "hw/input/adb.h"
#include "hw/qdev-properties.h"
#include "migration/vmstate.h"
#include "qemu/module.h"
#include "qemu/timer.h"
#include "adb-internal.h"
#include "trace.h"
/* error codes */
#define ADB_RET_NOTPRESENT (-2)
static const char *adb_commands[] = {
"RESET", "FLUSH", "(Reserved 0x2)", "(Reserved 0x3)",
"Reserved (0x4)", "(Reserved 0x5)", "(Reserved 0x6)", "(Reserved 0x7)",
"LISTEN r0", "LISTEN r1", "LISTEN r2", "LISTEN r3",
"TALK r0", "TALK r1", "TALK r2", "TALK r3",
};
static void adb_device_reset(ADBDevice *d)
{
qdev_reset_all(DEVICE(d));
}
static int do_adb_request(ADBBusState *s, uint8_t *obuf, const uint8_t *buf,
int len)
{
ADBDevice *d;
ADBDeviceClass *adc;
int devaddr, cmd, olen, i;
cmd = buf[0] & 0xf;
if (cmd == ADB_BUSRESET) {
for (i = 0; i < s->nb_devices; i++) {
d = s->devices[i];
adb_device_reset(d);
}
s->status = 0;
return 0;
}
s->pending = 0;
for (i = 0; i < s->nb_devices; i++) {
d = s->devices[i];
adc = ADB_DEVICE_GET_CLASS(d);
if (adc->devhasdata(d)) {
s->pending |= (1 << d->devaddr);
}
}
s->status = 0;
devaddr = buf[0] >> 4;
for (i = 0; i < s->nb_devices; i++) {
d = s->devices[i];
adc = ADB_DEVICE_GET_CLASS(d);
if (d->devaddr == devaddr) {
olen = adc->devreq(d, obuf, buf, len);
if (!olen) {
s->status |= ADB_STATUS_BUSTIMEOUT;
}
return olen;
}
}
s->status |= ADB_STATUS_BUSTIMEOUT;
return ADB_RET_NOTPRESENT;
}
int adb_request(ADBBusState *s, uint8_t *obuf, const uint8_t *buf, int len)
{
int ret;
trace_adb_bus_request(buf[0] >> 4, adb_commands[buf[0] & 0xf], len);
assert(s->autopoll_blocked);
ret = do_adb_request(s, obuf, buf, len);
trace_adb_bus_request_done(buf[0] >> 4, adb_commands[buf[0] & 0xf], ret);
return ret;
}
int adb_poll(ADBBusState *s, uint8_t *obuf, uint16_t poll_mask)
{
ADBDevice *d;
int olen, i;
uint8_t buf[1];
olen = 0;
for (i = 0; i < s->nb_devices; i++) {
if (s->poll_index >= s->nb_devices) {
s->poll_index = 0;
}
d = s->devices[s->poll_index];
if ((1 << d->devaddr) & poll_mask) {
buf[0] = ADB_READREG | (d->devaddr << 4);
olen = do_adb_request(s, obuf + 1, buf, 1);
/* if there is data, we poll again the same device */
if (olen > 0) {
s->status |= ADB_STATUS_POLLREPLY;
obuf[0] = buf[0];
olen++;
return olen;
}
}
s->poll_index++;
}
return olen;
}
void adb_set_autopoll_enabled(ADBBusState *s, bool enabled)
{
if (s->autopoll_enabled != enabled) {
s->autopoll_enabled = enabled;
if (s->autopoll_enabled) {
timer_mod(s->autopoll_timer,
qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
s->autopoll_rate_ms);
} else {
timer_del(s->autopoll_timer);
}
}
}
void adb_set_autopoll_rate_ms(ADBBusState *s, int rate_ms)
{
s->autopoll_rate_ms = rate_ms;
if (s->autopoll_enabled) {
timer_mod(s->autopoll_timer,
qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
s->autopoll_rate_ms);
}
}
void adb_set_autopoll_mask(ADBBusState *s, uint16_t mask)
{
if (s->autopoll_mask != mask) {
s->autopoll_mask = mask;
if (s->autopoll_enabled && s->autopoll_mask) {
timer_mod(s->autopoll_timer,
qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
s->autopoll_rate_ms);
} else {
timer_del(s->autopoll_timer);
}
}
}
void adb_autopoll_block(ADBBusState *s)
{
s->autopoll_blocked = true;
trace_adb_bus_autopoll_block(s->autopoll_blocked);
if (s->autopoll_enabled) {
timer_del(s->autopoll_timer);
}
}
void adb_autopoll_unblock(ADBBusState *s)
{
s->autopoll_blocked = false;
trace_adb_bus_autopoll_block(s->autopoll_blocked);
if (s->autopoll_enabled) {
timer_mod(s->autopoll_timer,
qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
s->autopoll_rate_ms);
}
}
static void adb_autopoll(void *opaque)
{
ADBBusState *s = opaque;
if (!s->autopoll_blocked) {
trace_adb_bus_autopoll_cb(s->autopoll_mask);
s->autopoll_cb(s->autopoll_cb_opaque);
trace_adb_bus_autopoll_cb_done(s->autopoll_mask);
}
timer_mod(s->autopoll_timer,
qemu_clock_get_ms(QEMU_CLOCK_VIRTUAL) +
s->autopoll_rate_ms);
}
void adb_register_autopoll_callback(ADBBusState *s, void (*cb)(void *opaque),
void *opaque)
{
s->autopoll_cb = cb;
s->autopoll_cb_opaque = opaque;
}
static const VMStateDescription vmstate_adb_bus = {
.name = "adb_bus",
.version_id = 0,
.minimum_version_id = 0,
.fields = (VMStateField[]) {
VMSTATE_TIMER_PTR(autopoll_timer, ADBBusState),
VMSTATE_BOOL(autopoll_enabled, ADBBusState),
VMSTATE_UINT8(autopoll_rate_ms, ADBBusState),
VMSTATE_UINT16(autopoll_mask, ADBBusState),
VMSTATE_BOOL(autopoll_blocked, ADBBusState),
VMSTATE_END_OF_LIST()
}
};
static void adb_bus_reset(BusState *qbus)
{
ADBBusState *adb_bus = ADB_BUS(qbus);
adb_bus->autopoll_enabled = false;
adb_bus->autopoll_mask = 0xffff;
adb_bus->autopoll_rate_ms = 20;
}
static void adb_bus_realize(BusState *qbus, Error **errp)
{
ADBBusState *adb_bus = ADB_BUS(qbus);
adb_bus->autopoll_timer = timer_new_ms(QEMU_CLOCK_VIRTUAL, adb_autopoll,
adb_bus);
vmstate_register(NULL, -1, &vmstate_adb_bus, adb_bus);
}
static void adb_bus_unrealize(BusState *qbus)
{
ADBBusState *adb_bus = ADB_BUS(qbus);
timer_del(adb_bus->autopoll_timer);
vmstate_unregister(NULL, &vmstate_adb_bus, adb_bus);
}
static void adb_bus_class_init(ObjectClass *klass, void *data)
{
BusClass *k = BUS_CLASS(klass);
k->realize = adb_bus_realize;
k->unrealize = adb_bus_unrealize;
k->reset = adb_bus_reset;
}
static const TypeInfo adb_bus_type_info = {
.name = TYPE_ADB_BUS,
.parent = TYPE_BUS,
.instance_size = sizeof(ADBBusState),
.class_init = adb_bus_class_init,
};
const VMStateDescription vmstate_adb_device = {
.name = "adb_device",
.version_id = 0,
.minimum_version_id = 0,
.fields = (VMStateField[]) {
VMSTATE_INT32(devaddr, ADBDevice),
VMSTATE_INT32(handler, ADBDevice),
VMSTATE_END_OF_LIST()
}
};
static void adb_device_realizefn(DeviceState *dev, Error **errp)
{
ADBDevice *d = ADB_DEVICE(dev);
ADBBusState *bus = ADB_BUS(qdev_get_parent_bus(dev));
if (bus->nb_devices >= MAX_ADB_DEVICES) {
return;
}
bus->devices[bus->nb_devices++] = d;
}
static void adb_device_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
dc->realize = adb_device_realizefn;
dc->bus_type = TYPE_ADB_BUS;
}
static const TypeInfo adb_device_type_info = {
.name = TYPE_ADB_DEVICE,
.parent = TYPE_DEVICE,
.class_size = sizeof(ADBDeviceClass),
.instance_size = sizeof(ADBDevice),
.abstract = true,
.class_init = adb_device_class_init,
};
static void adb_register_types(void)
{
type_register_static(&adb_bus_type_info);
type_register_static(&adb_device_type_info);
}
type_init(adb_register_types)
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