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baum: send device identity and cell count on protocol off/on

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The hardware devices do identify themselves when the driver turns the
protocol off and on again. NVDA expects to get it.

Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>
Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
This commit is contained in:
Samuel Thibault committed 2026-10-24 15:15:24 +02:00
1 parent c994a5d091
commit 4c0fe2b6a9
1 file changed
+26 -8
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chardev/baum.c
+26 -8
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@@ -95,9 +95,12 @@ struct BaumChardev {
brlapi_handle_t *brlapi;
brlapi_fileDescriptor brlapi_fd;
/* Initialized in baum_deferred_init */
unsigned int x, y;
bool deferred_init;
bool protocol_on;
uint8_t in_buf[BUF_SIZE];
uint8_t in_buf_used;
uint8_t out_buf[BUF_SIZE];
@@ -337,13 +340,27 @@ static void baum_write_packet(BaumChardev *baum, const uint8_t *buf, int len)
}
}
static void baum_send_cell_count(BaumChardev *baum)
{
uint8_t cell_count[] = { BAUM_RSP_CellCount, baum->x * baum->y };
baum_write_packet(baum, cell_count, sizeof(cell_count));
}
static void baum_send_device_identity(BaumChardev *baum)
{
uint8_t identity[17] = { BAUM_RSP_DeviceIdentity,
'B','a','u','m',' ','V','a','r','i','o' };
identity[11] = '0' + baum->x / 10;
identity[12] = '0' + baum->x % 10;
baum_write_packet(baum, identity, sizeof(identity));
}
/* Called when the other end seems to have a wrong idea of our display size */
static void baum_cellCount_timer_cb(void *opaque)
{
BaumChardev *baum = BAUM_CHARDEV(opaque);
uint8_t cell_count[] = { BAUM_RSP_CellCount, baum->x * baum->y };
DPRINTF("Timeout waiting for DisplayData, sending cell count\n");
baum_write_packet(baum, cell_count, sizeof(cell_count));
baum_send_cell_count(baum);
}
/* Try to interpret a whole incoming packet */
@@ -441,17 +458,18 @@ static int baum_eat_packet(BaumChardev *baum, const uint8_t *buf, int len)
uint8_t protocol;
DPRINTF("SetProtocol\n");
EAT(protocol);
/* ignore */
if (!baum->protocol_on && protocol) {
/* Switching on, answer with device identity and cell count */
baum_send_device_identity(baum);
baum_send_cell_count(baum);
}
baum->protocol_on = protocol;
break;
}
case BAUM_REQ_GetDeviceIdentity:
{
uint8_t identity[17] = { BAUM_RSP_DeviceIdentity,
'B','a','u','m',' ','V','a','r','i','o' };
DPRINTF("GetDeviceIdentity\n");
identity[11] = '0' + baum->x / 10;
identity[12] = '0' + baum->x % 10;
baum_write_packet(baum, identity, sizeof(identity));
baum_send_device_identity(baum);
break;
}
case BAUM_REQ_GetVersionNumber: