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adb: add autopoll_blocked variable to block autopoll

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Whilst autopoll is enabled it is necessary to prevent the ADB buffer contents
from being overwritten until the host has read back the response in its
entirety.

Add adb_autopoll_block() and adb_autopoll_unblock() functions in preparation
for ensuring that the ADB buffer contents are protected for explicit ADB
requests.

Signed-off-by: Mark Cave-Ayland <mark.cave-ayland@ilande.co.uk>
Tested-by: Finn Thain <fthain@telegraphics.com.au>
Acked-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20200623204936.24064-16-mark.cave-ayland@ilande.co.uk>
This commit is contained in:
Mark Cave-Ayland 2020-06-23 21:49:29 +01:00
parent d2288b7584
commit 4e5df0369f
2 changed files with 25 additions and 0 deletions
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21
hw/input/adb.c
View File

@ -157,6 +157,26 @@ void adb_set_autopoll_mask(ADBBusState *s, uint16_t mask)
}
}
void adb_autopoll_block(ADBBusState *s)
{
s->autopoll_blocked = true;
if (s->autopoll_enabled) {
timer_del(s->autopoll_timer);
}
}
void adb_autopoll_unblock(ADBBusState *s)
{
s->autopoll_blocked = false;
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;
@ -184,6 +204,7 @@ static const VMStateDescription vmstate_adb_bus = {
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()
}
};

4
include/hw/input/adb.h
View File

@ -86,6 +86,7 @@ struct ADBBusState {
QEMUTimer *autopoll_timer;
bool autopoll_enabled;
bool autopoll_blocked;
uint8_t autopoll_rate_ms;
uint16_t autopoll_mask;
void (*autopoll_cb)(void *opaque);
@ -96,6 +97,9 @@ int adb_request(ADBBusState *s, uint8_t *buf_out,
const uint8_t *buf, int len);
int adb_poll(ADBBusState *s, uint8_t *buf_out, uint16_t poll_mask);
void adb_autopoll_block(ADBBusState *s);
void adb_autopoll_unblock(ADBBusState *s);
void adb_set_autopoll_enabled(ADBBusState *s, bool enabled);
void adb_set_autopoll_rate_ms(ADBBusState *s, int rate_ms);
void adb_set_autopoll_mask(ADBBusState *s, uint16_t mask);