Bluetooth: Read Broadcom chip info for Apple Bluetooth devices

For the Apple Bluetooth devices that are Broadcom based, it makes sense
to read the chip information. It is a single HCI command and might help
gathering more information about these devices.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>

1 files changed, 37 insertions, 1 deletions

diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
index 1521dad3d460..9bf4d6ae6c6b 100644
--- a/drivers/bluetooth/btusb.c
+++ b/drivers/bluetooth/btusb.c
@@ -24,6 +24,7 @@
 #include <linux/module.h>
 #include <linux/usb.h>
 #include <linux/firmware.h>
+#include <asm/unaligned.h>
 
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
@@ -53,6 +54,7 @@ static struct usb_driver btusb_driver;
 #define BTUSB_INTEL_NEW         0x2000
 #define BTUSB_AMP               0x4000
 #define BTUSB_QCA_ROME          0x8000
+#define BTUSB_BCM_APPLE         0x10000
 
 static const struct usb_device_id btusb_table[] = {
         /* Generic Bluetooth USB device */
@@ -62,7 +64,8 @@ static const struct usb_device_id btusb_table[] = {
         { USB_DEVICE_INFO(0xe0, 0x01, 0x04), .driver_info = BTUSB_AMP },
 
         /* Apple-specific (Broadcom) devices */
-        { USB_VENDOR_AND_INTERFACE_INFO(0x05ac, 0xff, 0x01, 0x01) },
+        { USB_VENDOR_AND_INTERFACE_INFO(0x05ac, 0xff, 0x01, 0x01),
+          .driver_info = BTUSB_BCM_APPLE },
 
         /* MediaTek MT76x0E */
         { USB_DEVICE(0x0e8d, 0x763f) },
@@ -2634,6 +2637,34 @@ static int btusb_set_bdaddr_bcm(struct hci_dev *hdev, const bdaddr_t *bdaddr)
         return 0;
 }
 
+static int btusb_setup_bcm_apple(struct hci_dev *hdev)
+{
+        struct sk_buff *skb;
+        int err;
+
+        /* Read Verbose Config Version Info */
+        skb = __hci_cmd_sync(hdev, 0xfc79, 0, NULL, HCI_INIT_TIMEOUT);
+        if (IS_ERR(skb)) {
+                err = PTR_ERR(skb);
+                BT_ERR("%s: BCM: Read Verbose Version failed (%d)",
+                       hdev->name, err);
+                return err;
+        }
+
+        if (skb->len != 7) {
+                BT_ERR("%s: BCM: Read Verbose Version event length mismatch",
+                       hdev->name);
+                kfree_skb(skb);
+                return -EIO;
+        }
+
+        BT_INFO("%s: BCM: chip id %u build %4.4u", hdev->name, skb->data[1],
+                get_unaligned_le16(skb->data + 5));
+        kfree_skb(skb);
+
+        return 0;
+}
+
 static int btusb_set_bdaddr_ath3012(struct hci_dev *hdev,
                                     const bdaddr_t *bdaddr)
 {
@@ -3033,6 +3064,11 @@ static int btusb_probe(struct usb_interface *intf,
                 set_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks);
         }
 
+        if (id->driver_info & BTUSB_BCM_APPLE) {
+                hdev->setup = btusb_setup_bcm_apple;
+                set_bit(HCI_QUIRK_STRICT_DUPLICATE_FILTER, &hdev->quirks);
+        }
+
         if (id->driver_info & BTUSB_INTEL) {
                 hdev->setup = btusb_setup_intel;
                 hdev->shutdown = btusb_shutdown_intel;