1 // SPDX-License-Identifier: ISC 2 /* 3 * Copyright (c) 2017 Redpine Signals Inc. 4 * 5 */ 6 #include <linux/module.h> 7 #include <linux/kernel.h> 8 #include <net/bluetooth/bluetooth.h> 9 #include <net/bluetooth/hci_core.h> 10 #include <linux/unaligned.h> 11 #include <net/rsi_91x.h> 12 13 #define RSI_DMA_ALIGN 8 14 #define RSI_FRAME_DESC_SIZE 16 15 #define RSI_HEADROOM_FOR_BT_HAL (RSI_FRAME_DESC_SIZE + RSI_DMA_ALIGN) 16 17 struct rsi_hci_adapter { 18 void *priv; 19 struct rsi_proto_ops *proto_ops; 20 struct hci_dev *hdev; 21 }; 22 23 static int rsi_hci_open(struct hci_dev *hdev) 24 { 25 return 0; 26 } 27 28 static int rsi_hci_close(struct hci_dev *hdev) 29 { 30 return 0; 31 } 32 33 static int rsi_hci_flush(struct hci_dev *hdev) 34 { 35 return 0; 36 } 37 38 static int rsi_hci_send_pkt(struct hci_dev *hdev, struct sk_buff *skb) 39 { 40 struct rsi_hci_adapter *h_adapter = hci_get_drvdata(hdev); 41 struct sk_buff *new_skb = NULL; 42 43 switch (hci_skb_pkt_type(skb)) { 44 case HCI_COMMAND_PKT: 45 hdev->stat.cmd_tx++; 46 break; 47 case HCI_ACLDATA_PKT: 48 hdev->stat.acl_tx++; 49 break; 50 case HCI_SCODATA_PKT: 51 hdev->stat.sco_tx++; 52 break; 53 } 54 55 if (skb_headroom(skb) < RSI_HEADROOM_FOR_BT_HAL) { 56 /* Insufficient skb headroom - allocate a new skb */ 57 new_skb = skb_realloc_headroom(skb, RSI_HEADROOM_FOR_BT_HAL); 58 if (unlikely(!new_skb)) 59 return -ENOMEM; 60 bt_cb(new_skb)->pkt_type = hci_skb_pkt_type(skb); 61 kfree_skb(skb); 62 skb = new_skb; 63 if (!IS_ALIGNED((unsigned long)skb->data, RSI_DMA_ALIGN)) { 64 u8 *skb_data = skb->data; 65 int skb_len = skb->len; 66 67 skb_push(skb, RSI_DMA_ALIGN); 68 skb_pull(skb, PTR_ALIGN(skb->data, 69 RSI_DMA_ALIGN) - skb->data); 70 memmove(skb->data, skb_data, skb_len); 71 skb_trim(skb, skb_len); 72 } 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_obj(*h_adapter); 106 if (!h_adapter) 107 return -ENOMEM; 108 109 h_adapter->priv = priv; 110 h_adapter->proto_ops = ops; 111 112 hdev = hci_alloc_dev(); 113 if (!hdev) { 114 BT_ERR("Failed to alloc HCI device"); 115 goto err; 116 } 117 118 h_adapter->hdev = hdev; 119 120 if (ops->get_host_intf(priv) == RSI_HOST_INTF_SDIO) 121 hdev->bus = HCI_SDIO; 122 else 123 hdev->bus = HCI_USB; 124 125 hci_set_drvdata(hdev, h_adapter); 126 hdev->open = rsi_hci_open; 127 hdev->close = rsi_hci_close; 128 hdev->flush = rsi_hci_flush; 129 hdev->send = rsi_hci_send_pkt; 130 131 err = hci_register_dev(hdev); 132 if (err < 0) { 133 BT_ERR("HCI registration failed with errcode %d", err); 134 hci_free_dev(hdev); 135 goto err; 136 } 137 138 ops->set_bt_context(priv, h_adapter); 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_LICENSE("Dual BSD/GPL"); 187