Bluetooth: hci_uart: Add protocol support for Broadcom UART devices

This adds the protocol support for Broadcom based UART devices to
enable firmware and patchram download procedure. It is a pretty
straight forward H:4 driver with the exception of actually having
its own setup and address configuration callbacks.

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

4 files changed, 127 insertions, 0 deletions

diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig
index ea76031eb93f..93351b91bbb4 100644
--- a/drivers/bluetooth/Kconfig
+++ b/drivers/bluetooth/Kconfig
@@ -122,6 +122,7 @@ config BT_HCIUART_INTEL
 config BT_HCIUART_BCM
         bool "Broadcom protocol support"
         depends on BT_HCIUART
+        select BT_HCIUART_H4
         select BT_BCM
         help
           The Broadcom protocol support enables Bluetooth HCI over serial
diff --git a/drivers/bluetooth/hci_bcm.c b/drivers/bluetooth/hci_bcm.c
index dd338fa77433..fe1905c4beb2 100644
--- a/drivers/bluetooth/hci_bcm.c
+++ b/drivers/bluetooth/hci_bcm.c
@@ -28,4 +28,119 @@
 #include <net/bluetooth/bluetooth.h>
 #include <net/bluetooth/hci_core.h>
 
+#include "btbcm.h"
 #include "hci_uart.h"
+
+struct bcm_data {
+        struct sk_buff *rx_skb;
+        struct sk_buff_head txq;
+};
+
+static int bcm_open(struct hci_uart *hu)
+{
+        struct bcm_data *bcm;
+
+        BT_DBG("hu %p", hu);
+
+        bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
+        if (!bcm)
+                return -ENOMEM;
+
+        skb_queue_head_init(&bcm->txq);
+
+        hu->priv = bcm;
+        return 0;
+}
+
+static int bcm_close(struct hci_uart *hu)
+{
+        struct bcm_data *bcm = hu->priv;
+
+        BT_DBG("hu %p", hu);
+
+        skb_queue_purge(&bcm->txq);
+        kfree_skb(bcm->rx_skb);
+        kfree(bcm);
+
+        hu->priv = NULL;
+        return 0;
+}
+
+static int bcm_flush(struct hci_uart *hu)
+{
+        struct bcm_data *bcm = hu->priv;
+
+        BT_DBG("hu %p", hu);
+
+        skb_queue_purge(&bcm->txq);
+
+        return 0;
+}
+
+static int bcm_setup(struct hci_uart *hu)
+{
+        BT_DBG("hu %p", hu);
+
+        hu->hdev->set_bdaddr = btbcm_set_bdaddr;
+
+        return btbcm_setup_patchram(hu->hdev);
+}
+
+static int bcm_recv(struct hci_uart *hu, const void *data, int count)
+{
+        struct bcm_data *bcm = hu->priv;
+
+        if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
+                return -EUNATCH;
+
+        bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count);
+        if (IS_ERR(bcm->rx_skb)) {
+                int err = PTR_ERR(bcm->rx_skb);
+                BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
+                return err;
+        }
+
+        return count;
+}
+
+static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
+{
+        struct bcm_data *bcm = hu->priv;
+
+        BT_DBG("hu %p skb %p", hu, skb);
+
+        /* Prepend skb with frame type */
+        memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
+        skb_queue_tail(&bcm->txq, skb);
+
+        return 0;
+}
+
+static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
+{
+        struct bcm_data *bcm = hu->priv;
+
+        return skb_dequeue(&bcm->txq);
+}
+
+static const struct hci_uart_proto bcm_proto = {
+        .id             = HCI_UART_BCM,
+        .name           = "BCM",
+        .open           = bcm_open,
+        .close          = bcm_close,
+        .flush          = bcm_flush,
+        .setup          = bcm_setup,
+        .recv           = bcm_recv,
+        .enqueue        = bcm_enqueue,
+        .dequeue        = bcm_dequeue,
+};
+
+int __init bcm_init(void)
+{
+        return hci_uart_register_proto(&bcm_proto);
+}
+
+int __exit bcm_deinit(void)
+{
+        return hci_uart_unregister_proto(&bcm_proto);
+}
diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c
index b182ddc43dfe..a106c3e201e3 100644
--- a/drivers/bluetooth/hci_ldisc.c
+++ b/drivers/bluetooth/hci_ldisc.c
@@ -679,6 +679,9 @@ static int __init hci_uart_init(void)
 #ifdef CONFIG_BT_HCIUART_3WIRE
         h5_init();
 #endif
+#ifdef CONFIG_BT_HCIUART_BCM
+        bcm_init();
+#endif
 
         return 0;
 }
@@ -702,6 +705,9 @@ static void __exit hci_uart_exit(void)
 #ifdef CONFIG_BT_HCIUART_3WIRE
         h5_deinit();
 #endif
+#ifdef CONFIG_BT_HCIUART_BCM
+        bcm_deinit();
+#endif
 
         /* Release tty registration of line discipline */
         err = tty_unregister_ldisc(N_HCI);
diff --git a/drivers/bluetooth/hci_uart.h b/drivers/bluetooth/hci_uart.h
index 466798acf049..a3108abce5d3 100644
--- a/drivers/bluetooth/hci_uart.h
+++ b/drivers/bluetooth/hci_uart.h
@@ -128,3 +128,8 @@ int h5_deinit(void);
 #ifdef CONFIG_BT_HCIUART_INTEL
 int intel_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr);
 #endif
+
+#ifdef CONFIG_BT_HCIUART_BCM
+int bcm_init(void);
+int bcm_deinit(void);
+#endif