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>

3 files changed, 20 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;
 }
diff --git a/hw/input/adb-mouse.c b/hw/input/adb-mouse.c
index 78b6f5030c..e2359fd74d 100644
--- a/hw/input/adb-mouse.c
+++ b/hw/input/adb-mouse.c
@@ -197,6 +197,14 @@ static int adb_mouse_request(ADBDevice *d, uint8_t *obuf,
     return olen;
 }
 
+static bool adb_mouse_has_data(ADBDevice *d)
+{
+    MouseState *s = ADB_MOUSE(d);
+
+    return !(s->last_buttons_state == s->buttons_state &&
+             s->dx == 0 && s->dy == 0);
+}
+
 static void adb_mouse_reset(DeviceState *dev)
 {
     ADBDevice *d = ADB_DEVICE(dev);
@@ -252,6 +260,7 @@ static void adb_mouse_class_init(ObjectClass *oc, void *data)
     set_bit(DEVICE_CATEGORY_INPUT, dc->categories);
 
     adc->devreq = adb_mouse_request;
+    adc->devhasdata = adb_mouse_has_data;
     dc->reset = adb_mouse_reset;
     dc->vmsd = &vmstate_adb_mouse;
 }
diff --git a/include/hw/input/adb.h b/include/hw/input/adb.h
index 15b1874a3d..9b80204e43 100644
--- a/include/hw/input/adb.h
+++ b/include/hw/input/adb.h
@@ -39,6 +39,8 @@ typedef struct ADBDevice ADBDevice;
 typedef int ADBDeviceRequest(ADBDevice *d, uint8_t *buf_out,
                               const uint8_t *buf, int len);
 
+typedef bool ADBDeviceHasData(ADBDevice *d);
+
 #define TYPE_ADB_DEVICE "adb-device"
 #define ADB_DEVICE(obj) OBJECT_CHECK(ADBDevice, (obj), TYPE_ADB_DEVICE)
 
@@ -62,6 +64,7 @@ typedef struct ADBDeviceClass {
     /*< public >*/
 
     ADBDeviceRequest *devreq;
+    ADBDeviceHasData *devhasdata;
 } ADBDeviceClass;
 
 #define TYPE_ADB_BUS "apple-desktop-bus"