1 files changed, 101 insertions, 0 deletions
diff --git a/sound/usb/quirks.c b/sound/usb/quirks.c
index f372c624bbf4..e6ce1bbe6ca6 100644
--- a/sound/usb/quirks.c
+++ b/sound/usb/quirks.c
@@ -1000,6 +1000,105 @@ static int snd_usb_axefx3_boot_quirk(struct usb_device *dev)
 	return 0;
 }
 
+
+#define MICROBOOK_BUF_SIZE 128
+
+static int snd_usb_motu_microbookii_communicate(struct usb_device *dev, u8 *buf,
+						int buf_size, int *length)
+{
+	int err, actual_length;
+
+	err = usb_interrupt_msg(dev, usb_sndintpipe(dev, 0x01), buf, *length,
+				&actual_length, 1000);
+	if (err < 0)
+		return err;
+
+	print_hex_dump(KERN_DEBUG, "MicroBookII snd: ", DUMP_PREFIX_NONE, 16, 1,
+		       buf, actual_length, false);
+
+	memset(buf, 0, buf_size);
+
+	err = usb_interrupt_msg(dev, usb_rcvintpipe(dev, 0x82), buf, buf_size,
+				&actual_length, 1000);
+	if (err < 0)
+		return err;
+
+	print_hex_dump(KERN_DEBUG, "MicroBookII rcv: ", DUMP_PREFIX_NONE, 16, 1,
+		       buf, actual_length, false);
+
+	*length = actual_length;
+	return 0;
+}
+
+static int snd_usb_motu_microbookii_boot_quirk(struct usb_device *dev)
+{
+	int err, actual_length, poll_attempts = 0;
+	static const u8 set_samplerate_seq[] = { 0x00, 0x00, 0x00, 0x00,
+						 0x00, 0x00, 0x0b, 0x14,
+						 0x00, 0x00, 0x00, 0x01 };
+	static const u8 poll_ready_seq[] = { 0x00, 0x04, 0x00, 0x00,
+					     0x00, 0x00, 0x0b, 0x18 };
+	u8 *buf = kzalloc(MICROBOOK_BUF_SIZE, GFP_KERNEL);
+
+	if (!buf)
+		return -ENOMEM;
+
+	dev_info(&dev->dev, "Waiting for MOTU Microbook II to boot up...\n");
+
+	/* First we tell the device which sample rate to use. */
+	memcpy(buf, set_samplerate_seq, sizeof(set_samplerate_seq));
+	actual_length = sizeof(set_samplerate_seq);
+	err = snd_usb_motu_microbookii_communicate(dev, buf, MICROBOOK_BUF_SIZE,
+						   &actual_length);
+
+	if (err < 0) {
+		dev_err(&dev->dev,
+			"failed setting the sample rate for Motu MicroBook II: %d\n",
+			err);
+		goto free_buf;
+	}
+
+	/* Then we poll every 100 ms until the device informs of its readiness. */
+	while (true) {
+		if (++poll_attempts > 100) {
+			dev_err(&dev->dev,
+				"failed booting Motu MicroBook II: timeout\n");
+			err = -ENODEV;
+			goto free_buf;
+		}
+
+		memset(buf, 0, MICROBOOK_BUF_SIZE);
+		memcpy(buf, poll_ready_seq, sizeof(poll_ready_seq));
+
+		actual_length = sizeof(poll_ready_seq);
+		err = snd_usb_motu_microbookii_communicate(
+			dev, buf, MICROBOOK_BUF_SIZE, &actual_length);
+		if (err < 0) {
+			dev_err(&dev->dev,
+				"failed booting Motu MicroBook II: communication error %d\n",
+				err);
+			goto free_buf;
+		}
+
+		/* the device signals its readiness through a message of the
+		 * form
+		 *           XX 06 00 00 00 00 0b 18  00 00 00 01
+		 * If the device is not yet ready to accept audio data, the
+		 * last byte of that sequence is 00.
+		 */
+		if (actual_length == 12 && buf[actual_length - 1] == 1)
+			break;
+
+		msleep(100);
+	}
+
+	dev_info(&dev->dev, "MOTU MicroBook II ready\n");
+
+free_buf:
+	kfree(buf);
+	return err;
+}
+
 /*
  * Setup quirks
  */
@@ -1177,6 +1276,8 @@ int snd_usb_apply_boot_quirk(struct usb_device *dev,
 		return snd_usb_gamecon780_boot_quirk(dev);
 	case USB_ID(0x2466, 0x8010): /* Fractal Audio Axe-Fx 3 */
 		return snd_usb_axefx3_boot_quirk(dev);
+	case USB_ID(0x07fd, 0x0004): /* MOTU MicroBook II */
+		return snd_usb_motu_microbookii_boot_quirk(dev);
 	}
 
 	return 0;