adb: introduce new ADBDeviceHasData method to ADBDeviceClass

This is required later to allow devices to assert a service request (SRQ)
signal to indicate that it has data to send, without having to consume it.

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: <20200623204936.24064-12-mark.cave-ayland@ilande.co.uk>

1 files changed, 8 insertions, 0 deletions

diff --git a/hw/input/adb-kbd.c b/hw/input/adb-kbd.c
index 027dd3e531..23760ecf7b 100644
--- a/hw/input/adb-kbd.c
+++ b/hw/input/adb-kbd.c
@@ -300,6 +300,13 @@ static int adb_kbd_request(ADBDevice *d, uint8_t *obuf,
     return olen;
 }
 
+static bool adb_kbd_has_data(ADBDevice *d)
+{
+    KBDState *s = ADB_KEYBOARD(d);
+
+    return s->count > 0;
+}
+
 /* This is where keyboard events enter this file */
 static void adb_keyboard_event(DeviceState *dev, QemuConsole *src,
                                InputEvent *evt)
@@ -382,6 +389,7 @@ static void adb_kbd_class_init(ObjectClass *oc, void *data)
     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
 
     adc->devreq = adb_kbd_request;
+    adc->devhasdata = adb_kbd_has_data;
     dc->reset = adb_kbd_reset;
     dc->vmsd = &vmstate_adb_kbd;
 }