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_DMA_ALIGN 8 25 #define RSI_FRAME_DESC_SIZE 16 26 #define RSI_HEADROOM_FOR_BT_HAL (RSI_FRAME_DESC_SIZE + RSI_DMA_ALIGN) 27 28 struct rsi_hci_adapter { 29 void *priv; 30 struct rsi_proto_ops *proto_ops; 31 struct hci_dev *hdev; 32 }; 33 34 static int rsi_hci_open(struct hci_dev *hdev) 35 { 36 return 0; 37 } 38 39 static int rsi_hci_close(struct hci_dev *hdev) 40 { 41 return 0; 42 } 43 44 static int rsi_hci_flush(struct hci_dev *hdev) 45 { 46 return 0; 47 } 48 49 static int rsi_hci_send_pkt(struct hci_dev *hdev, struct sk_buff *skb) 50 { 51 struct rsi_hci_adapter *h_adapter = hci_get_drvdata(hdev); 52 struct sk_buff *new_skb = NULL; 53 54 switch (hci_skb_pkt_type(skb)) { 55 case HCI_COMMAND_PKT: 56 hdev->stat.cmd_tx++; 57 break; 58 case HCI_ACLDATA_PKT: 59 hdev->stat.acl_tx++; 60 break; 61 case HCI_SCODATA_PKT: 62 hdev->stat.sco_tx++; 63 break; 64 } 65 66 if (skb_headroom(skb) < RSI_HEADROOM_FOR_BT_HAL) { 67 /* Insufficient skb headroom - allocate a new skb */ 68 new_skb = skb_realloc_headroom(skb, RSI_HEADROOM_FOR_BT_HAL); 69 if (unlikely(!new_skb)) 70 return -ENOMEM; 71 bt_cb(new_skb)->pkt_type = hci_skb_pkt_type(skb); 72 kfree_skb(skb); 73 skb = new_skb; 74 if (!IS_ALIGNED((unsigned long)skb->data, RSI_DMA_ALIGN)) { 75 u8 *skb_data = skb->data; 76 int skb_len = skb->len; 77 78 skb_push(skb, RSI_DMA_ALIGN); 79 skb_pull(skb, PTR_ALIGN(skb->data, 80 RSI_DMA_ALIGN) - skb->data); 81 memmove(skb->data, skb_data, skb_len); 82 skb_trim(skb, skb_len); 83 } 84 } 85 86 return h_adapter->proto_ops->coex_send_pkt(h_adapter->priv, skb, 87 RSI_BT_Q); 88 } 89 90 static int rsi_hci_recv_pkt(void *priv, const u8 *pkt) 91 { 92 struct rsi_hci_adapter *h_adapter = priv; 93 struct hci_dev *hdev = h_adapter->hdev; 94 struct sk_buff *skb; 95 int pkt_len = get_unaligned_le16(pkt) & 0x0fff; 96 97 skb = dev_alloc_skb(pkt_len); 98 if (!skb) 99 return -ENOMEM; 100 101 memcpy(skb->data, pkt + RSI_FRAME_DESC_SIZE, pkt_len); 102 skb_put(skb, pkt_len); 103 h_adapter->hdev->stat.byte_rx += skb->len; 104 105 hci_skb_pkt_type(skb) = pkt[14]; 106 107 return hci_recv_frame(hdev, skb); 108 } 109 110 static int rsi_hci_attach(void *priv, struct rsi_proto_ops *ops) 111 { 112 struct rsi_hci_adapter *h_adapter = NULL; 113 struct hci_dev *hdev; 114 int err = 0; 115 116 h_adapter = kzalloc(sizeof(*h_adapter), GFP_KERNEL); 117 if (!h_adapter) 118 return -ENOMEM; 119 120 h_adapter->priv = priv; 121 ops->set_bt_context(priv, h_adapter); 122 h_adapter->proto_ops = ops; 123 124 hdev = hci_alloc_dev(); 125 if (!hdev) { 126 BT_ERR("Failed to alloc HCI device"); 127 goto err; 128 } 129 130 h_adapter->hdev = hdev; 131 132 if (ops->get_host_intf(priv) == RSI_HOST_INTF_SDIO) 133 hdev->bus = HCI_SDIO; 134 else 135 hdev->bus = HCI_USB; 136 137 hci_set_drvdata(hdev, h_adapter); 138 hdev->dev_type = HCI_PRIMARY; 139 hdev->open = rsi_hci_open; 140 hdev->close = rsi_hci_close; 141 hdev->flush = rsi_hci_flush; 142 hdev->send = rsi_hci_send_pkt; 143 144 err = hci_register_dev(hdev); 145 if (err < 0) { 146 BT_ERR("HCI registration failed with errcode %d", err); 147 hci_free_dev(hdev); 148 goto err; 149 } 150 151 return 0; 152 err: 153 h_adapter->hdev = NULL; 154 kfree(h_adapter); 155 return -EINVAL; 156 } 157 158 static void rsi_hci_detach(void *priv) 159 { 160 struct rsi_hci_adapter *h_adapter = priv; 161 struct hci_dev *hdev; 162 163 if (!h_adapter) 164 return; 165 166 hdev = h_adapter->hdev; 167 if (hdev) { 168 hci_unregister_dev(hdev); 169 hci_free_dev(hdev); 170 h_adapter->hdev = NULL; 171 } 172 173 kfree(h_adapter); 174 } 175 176 const struct rsi_mod_ops rsi_bt_ops = { 177 .attach = rsi_hci_attach, 178 .detach = rsi_hci_detach, 179 .recv_pkt = rsi_hci_recv_pkt, 180 }; 181 EXPORT_SYMBOL(rsi_bt_ops); 182 183 static int rsi_91x_bt_module_init(void) 184 { 185 return 0; 186 } 187 188 static void rsi_91x_bt_module_exit(void) 189 { 190 return; 191 } 192 193 module_init(rsi_91x_bt_module_init); 194 module_exit(rsi_91x_bt_module_exit); 195 MODULE_AUTHOR("Redpine Signals Inc"); 196 MODULE_DESCRIPTION("RSI BT driver"); 197 MODULE_SUPPORTED_DEVICE("RSI-BT"); 198 MODULE_LICENSE("Dual BSD/GPL"); 199