drivers/bluetooth/btrsi.c

   1 /**
   2  * Copyright (c) 2017 Redpine Signals Inc.
   3  *
   4  * Permission to use, copy, modify, and/or distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  15  */
  16 #include <linux/module.h>
  17 #include <linux/kernel.h>
  18 #include <net/bluetooth/bluetooth.h>
  19 #include <net/bluetooth/hci_core.h>
  20 #include <asm/unaligned.h>
  21 #include <net/rsi_91x.h>
  22 #include <net/genetlink.h>
  23
  24 #define RSI_HEADROOM_FOR_BT_HAL 16
  25 #define RSI_FRAME_DESC_SIZE     16
  26
  27 struct rsi_hci_adapter {
  28         void *priv;
  29         struct rsi_proto_ops *proto_ops;
  30         struct hci_dev *hdev;
  31 };
  32
  33 static int rsi_hci_open(struct hci_dev *hdev)
  34 {
  35         return 0;
  36 }
  37
  38 static int rsi_hci_close(struct hci_dev *hdev)
  39 {
  40         return 0;
  41 }
  42
  43 static int rsi_hci_flush(struct hci_dev *hdev)
  44 {
  45         return 0;
  46 }
  47
  48 static int rsi_hci_send_pkt(struct hci_dev *hdev, struct sk_buff *skb)
  49 {
  50         struct rsi_hci_adapter *h_adapter = hci_get_drvdata(hdev);
  51         struct sk_buff *new_skb = NULL;
  52
  53         switch (hci_skb_pkt_type(skb)) {
  54         case HCI_COMMAND_PKT:
  55                 hdev->stat.cmd_tx++;
  56                 break;
  57         case HCI_ACLDATA_PKT:
  58                 hdev->stat.acl_tx++;
  59                 break;
  60         case HCI_SCODATA_PKT:
  61                 hdev->stat.sco_tx++;
  62                 break;
  63         }
  64
  65         if (skb_headroom(skb) < RSI_HEADROOM_FOR_BT_HAL) {
  66                 /* Insufficient skb headroom - allocate a new skb */
  67                 new_skb = skb_realloc_headroom(skb, RSI_HEADROOM_FOR_BT_HAL);
  68                 if (unlikely(!new_skb))
  69                         return -ENOMEM;
  70                 bt_cb(new_skb)->pkt_type = hci_skb_pkt_type(skb);
  71                 kfree_skb(skb);
  72                 skb = new_skb;
  73         }
  74
  75         return h_adapter->proto_ops->coex_send_pkt(h_adapter->priv, skb,
  76                                                    RSI_BT_Q);
  77 }
  78
  79 static int rsi_hci_recv_pkt(void *priv, const u8 *pkt)
  80 {
  81         struct rsi_hci_adapter *h_adapter = priv;
  82         struct hci_dev *hdev = h_adapter->hdev;
  83         struct sk_buff *skb;
  84         int pkt_len = get_unaligned_le16(pkt) & 0x0fff;
  85
  86         skb = dev_alloc_skb(pkt_len);
  87         if (!skb)
  88                 return -ENOMEM;
  89
  90         memcpy(skb->data, pkt + RSI_FRAME_DESC_SIZE, pkt_len);
  91         skb_put(skb, pkt_len);
  92         h_adapter->hdev->stat.byte_rx += skb->len;
  93
  94         hci_skb_pkt_type(skb) = pkt[14];
  95
  96         return hci_recv_frame(hdev, skb);
  97 }
  98
  99 static int rsi_hci_attach(void *priv, struct rsi_proto_ops *ops)
 100 {
 101         struct rsi_hci_adapter *h_adapter = NULL;
 102         struct hci_dev *hdev;
 103         int err = 0;
 104
 105         h_adapter = kzalloc(sizeof(*h_adapter), GFP_KERNEL);
 106         if (!h_adapter)
 107                 return -ENOMEM;
 108
 109         h_adapter->priv = priv;
 110         ops->set_bt_context(priv, h_adapter);
 111         h_adapter->proto_ops = ops;
 112
 113         hdev = hci_alloc_dev();
 114         if (!hdev) {
 115                 BT_ERR("Failed to alloc HCI device");
 116                 goto err;
 117         }
 118
 119         h_adapter->hdev = hdev;
 120
 121         if (ops->get_host_intf(priv) == RSI_HOST_INTF_SDIO)
 122                 hdev->bus = HCI_SDIO;
 123         else
 124                 hdev->bus = HCI_USB;
 125
 126         hci_set_drvdata(hdev, h_adapter);
 127         hdev->dev_type = HCI_PRIMARY;
 128         hdev->open = rsi_hci_open;
 129         hdev->close = rsi_hci_close;
 130         hdev->flush = rsi_hci_flush;
 131         hdev->send = rsi_hci_send_pkt;
 132
 133         err = hci_register_dev(hdev);
 134         if (err < 0) {
 135                 BT_ERR("HCI registration failed with errcode %d", err);
 136                 hci_free_dev(hdev);
 137                 goto err;
 138         }
 139
 140         return 0;
 141 err:
 142         h_adapter->hdev = NULL;
 143         kfree(h_adapter);
 144         return -EINVAL;
 145 }
 146
 147 static void rsi_hci_detach(void *priv)
 148 {
 149         struct rsi_hci_adapter *h_adapter = priv;
 150         struct hci_dev *hdev;
 151
 152         if (!h_adapter)
 153                 return;
 154
 155         hdev = h_adapter->hdev;
 156         if (hdev) {
 157                 hci_unregister_dev(hdev);
 158                 hci_free_dev(hdev);
 159                 h_adapter->hdev = NULL;
 160         }
 161
 162         kfree(h_adapter);
 163 }
 164
 165 const struct rsi_mod_ops rsi_bt_ops = {
 166         .attach = rsi_hci_attach,
 167         .detach = rsi_hci_detach,
 168         .recv_pkt = rsi_hci_recv_pkt,
 169 };
 170 EXPORT_SYMBOL(rsi_bt_ops);
 171
 172 static int rsi_91x_bt_module_init(void)
 173 {
 174         return 0;
 175 }
 176
 177 static void rsi_91x_bt_module_exit(void)
 178 {
 179         return;
 180 }
 181
 182 module_init(rsi_91x_bt_module_init);
 183 module_exit(rsi_91x_bt_module_exit);
 184 MODULE_AUTHOR("Redpine Signals Inc");
 185 MODULE_DESCRIPTION("RSI BT driver");
 186 MODULE_SUPPORTED_DEVICE("RSI-BT");
 187 MODULE_LICENSE("Dual BSD/GPL");