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 <linux/unaligned.h> 21 #include <net/rsi_91x.h> 22 23 #define RSI_DMA_ALIGN 8 24 #define RSI_FRAME_DESC_SIZE 16 25 #define RSI_HEADROOM_FOR_BT_HAL (RSI_FRAME_DESC_SIZE + RSI_DMA_ALIGN) 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 if (!IS_ALIGNED((unsigned long)skb->data, RSI_DMA_ALIGN)) { 74 u8 *skb_data = skb->data; 75 int skb_len = skb->len; 76 77 skb_push(skb, RSI_DMA_ALIGN); 78 skb_pull(skb, PTR_ALIGN(skb->data, 79 RSI_DMA_ALIGN) - skb->data); 80 memmove(skb->data, skb_data, skb_len); 81 skb_trim(skb, skb_len); 82 } 83 } 84 85 return h_adapter->proto_ops->coex_send_pkt(h_adapter->priv, skb, 86 RSI_BT_Q); 87 } 88 89 static int rsi_hci_recv_pkt(void *priv, const u8 *pkt) 90 { 91 struct rsi_hci_adapter *h_adapter = priv; 92 struct hci_dev *hdev = h_adapter->hdev; 93 struct sk_buff *skb; 94 int pkt_len = get_unaligned_le16(pkt) & 0x0fff; 95 96 skb = dev_alloc_skb(pkt_len); 97 if (!skb) 98 return -ENOMEM; 99 100 memcpy(skb->data, pkt + RSI_FRAME_DESC_SIZE, pkt_len); 101 skb_put(skb, pkt_len); 102 h_adapter->hdev->stat.byte_rx += skb->len; 103 104 hci_skb_pkt_type(skb) = pkt[14]; 105 106 return hci_recv_frame(hdev, skb); 107 } 108 109 static int rsi_hci_attach(void *priv, struct rsi_proto_ops *ops) 110 { 111 struct rsi_hci_adapter *h_adapter = NULL; 112 struct hci_dev *hdev; 113 int err = 0; 114 115 h_adapter = kzalloc(sizeof(*h_adapter), GFP_KERNEL); 116 if (!h_adapter) 117 return -ENOMEM; 118 119 h_adapter->priv = priv; 120 ops->set_bt_context(priv, h_adapter); 121 h_adapter->proto_ops = ops; 122 123 hdev = hci_alloc_dev(); 124 if (!hdev) { 125 BT_ERR("Failed to alloc HCI device"); 126 goto err; 127 } 128 129 h_adapter->hdev = hdev; 130 131 if (ops->get_host_intf(priv) == RSI_HOST_INTF_SDIO) 132 hdev->bus = HCI_SDIO; 133 else 134 hdev->bus = HCI_USB; 135 136 hci_set_drvdata(hdev, h_adapter); 137 hdev->open = rsi_hci_open; 138 hdev->close = rsi_hci_close; 139 hdev->flush = rsi_hci_flush; 140 hdev->send = rsi_hci_send_pkt; 141 142 err = hci_register_dev(hdev); 143 if (err < 0) { 144 BT_ERR("HCI registration failed with errcode %d", err); 145 hci_free_dev(hdev); 146 goto err; 147 } 148 149 return 0; 150 err: 151 h_adapter->hdev = NULL; 152 kfree(h_adapter); 153 return -EINVAL; 154 } 155 156 static void rsi_hci_detach(void *priv) 157 { 158 struct rsi_hci_adapter *h_adapter = priv; 159 struct hci_dev *hdev; 160 161 if (!h_adapter) 162 return; 163 164 hdev = h_adapter->hdev; 165 if (hdev) { 166 hci_unregister_dev(hdev); 167 hci_free_dev(hdev); 168 h_adapter->hdev = NULL; 169 } 170 171 kfree(h_adapter); 172 } 173 174 const struct rsi_mod_ops rsi_bt_ops = { 175 .attach = rsi_hci_attach, 176 .detach = rsi_hci_detach, 177 .recv_pkt = rsi_hci_recv_pkt, 178 }; 179 EXPORT_SYMBOL(rsi_bt_ops); 180 181 static int rsi_91x_bt_module_init(void) 182 { 183 return 0; 184 } 185 186 static void rsi_91x_bt_module_exit(void) 187 { 188 return; 189 } 190 191 module_init(rsi_91x_bt_module_init); 192 module_exit(rsi_91x_bt_module_exit); 193 MODULE_AUTHOR("Redpine Signals Inc"); 194 MODULE_DESCRIPTION("RSI BT driver"); 195 MODULE_LICENSE("Dual BSD/GPL"); 196