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"); 188