drivers/bluetooth/hci_bcm.c

   1 /*
   2  *
   3  *  Bluetooth HCI UART driver for Broadcom devices
   4  *
   5  *  Copyright (C) 2015  Intel Corporation
   6  *
   7  *
   8  *  This program is free software; you can redistribute it and/or modify
   9  *  it under the terms of the GNU General Public License as published by
  10  *  the Free Software Foundation; either version 2 of the License, or
  11  *  (at your option) any later version.
  12  *
  13  *  This program is distributed in the hope that it will be useful,
  14  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  15  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16  *  GNU General Public License for more details.
  17  *
  18  *  You should have received a copy of the GNU General Public License
  19  *  along with this program; if not, write to the Free Software
  20  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  21  *
  22  */
  23
  24 #include <linux/kernel.h>
  25 #include <linux/errno.h>
  26 #include <linux/skbuff.h>
  27
  28 #include <net/bluetooth/bluetooth.h>
  29 #include <net/bluetooth/hci_core.h>
  30
  31 #include "btbcm.h"
  32 #include "hci_uart.h"
  33
  34 struct bcm_data {
  35         struct sk_buff *rx_skb;
  36         struct sk_buff_head txq;
  37 };
  38
  39 static int bcm_open(struct hci_uart *hu)
  40 {
  41         struct bcm_data *bcm;
  42
  43         BT_DBG("hu %p", hu);
  44
  45         bcm = kzalloc(sizeof(*bcm), GFP_KERNEL);
  46         if (!bcm)
  47                 return -ENOMEM;
  48
  49         skb_queue_head_init(&bcm->txq);
  50
  51         hu->priv = bcm;
  52         return 0;
  53 }
  54
  55 static int bcm_close(struct hci_uart *hu)
  56 {
  57         struct bcm_data *bcm = hu->priv;
  58
  59         BT_DBG("hu %p", hu);
  60
  61         skb_queue_purge(&bcm->txq);
  62         kfree_skb(bcm->rx_skb);
  63         kfree(bcm);
  64
  65         hu->priv = NULL;
  66         return 0;
  67 }
  68
  69 static int bcm_flush(struct hci_uart *hu)
  70 {
  71         struct bcm_data *bcm = hu->priv;
  72
  73         BT_DBG("hu %p", hu);
  74
  75         skb_queue_purge(&bcm->txq);
  76
  77         return 0;
  78 }
  79
  80 static int bcm_setup(struct hci_uart *hu)
  81 {
  82         BT_DBG("hu %p", hu);
  83
  84         hu->hdev->set_bdaddr = btbcm_set_bdaddr;
  85
  86         return btbcm_setup_patchram(hu->hdev);
  87 }
  88
  89 static const struct h4_recv_pkt bcm_recv_pkts[] = {
  90         { H4_RECV_ACL,   .recv = hci_recv_frame },
  91         { H4_RECV_SCO,   .recv = hci_recv_frame },
  92         { H4_RECV_EVENT, .recv = hci_recv_frame },
  93 };
  94
  95 static int bcm_recv(struct hci_uart *hu, const void *data, int count)
  96 {
  97         struct bcm_data *bcm = hu->priv;
  98
  99         if (!test_bit(HCI_UART_REGISTERED, &hu->flags))
 100                 return -EUNATCH;
 101
 102         bcm->rx_skb = h4_recv_buf(hu->hdev, bcm->rx_skb, data, count,
 103                                   bcm_recv_pkts, ARRAY_SIZE(bcm_recv_pkts));
 104         if (IS_ERR(bcm->rx_skb)) {
 105                 int err = PTR_ERR(bcm->rx_skb);
 106                 BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err);
 107                 return err;
 108         }
 109
 110         return count;
 111 }
 112
 113 static int bcm_enqueue(struct hci_uart *hu, struct sk_buff *skb)
 114 {
 115         struct bcm_data *bcm = hu->priv;
 116
 117         BT_DBG("hu %p skb %p", hu, skb);
 118
 119         /* Prepend skb with frame type */
 120         memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
 121         skb_queue_tail(&bcm->txq, skb);
 122
 123         return 0;
 124 }
 125
 126 static struct sk_buff *bcm_dequeue(struct hci_uart *hu)
 127 {
 128         struct bcm_data *bcm = hu->priv;
 129
 130         return skb_dequeue(&bcm->txq);
 131 }
 132
 133 static const struct hci_uart_proto bcm_proto = {
 134         .id             = HCI_UART_BCM,
 135         .name           = "BCM",
 136         .open           = bcm_open,
 137         .close          = bcm_close,
 138         .flush          = bcm_flush,
 139         .setup          = bcm_setup,
 140         .recv           = bcm_recv,
 141         .enqueue        = bcm_enqueue,
 142         .dequeue        = bcm_dequeue,
 143 };
 144
 145 int __init bcm_init(void)
 146 {
 147         return hci_uart_register_proto(&bcm_proto);
 148 }
 149
 150 int __exit bcm_deinit(void)
 151 {
 152         return hci_uart_unregister_proto(&bcm_proto);
 153 }