media: i2c: adv7180: Print the chip ID on probe

Improve the probe message by printing the chip ID version.
Signed-off-by: Fabio Estevam <festevam@gmail.com>
Reviewed-by: Frieder Schrempf <frieder.schrempf@kontron.de>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/i2c/adv7180.c

@@ -1415,11 +1415,19 @@ static int adv7180_probe(struct i2c_client *client,
 	if (ret)
 		goto err_free_irq;
 
-	v4l_info(client, "chip found @ 0x%02x (%s)\n",
-		 client->addr, client->adapter->name);
+	mutex_lock(&state->mutex);
+	ret = adv7180_read(state, ADV7180_REG_IDENT);
+	mutex_unlock(&state->mutex);
+	if (ret < 0)
+		goto err_v4l2_async_unregister;
+
+	v4l_info(client, "chip id 0x%x found @ 0x%02x (%s)\n",
+		 ret, client->addr, client->adapter->name);
 
 	return 0;
 
+err_v4l2_async_unregister:
+	v4l2_async_unregister_subdev(sd);
 err_free_irq:
 	if (state->irq > 0)
 		free_irq(client->irq, state);