/** * Copyright (c) 2017 Redpine Signals Inc. * * Permission to use, copy, modify, and/or distribute this software for any * purpose with or without fee is hereby granted, provided that the above * copyright notice and this permission notice appear in all copies. * * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. */ #include <linux/module.h> #include <linux/kernel.h> #include <net/bluetooth/bluetooth.h> #include <net/bluetooth/hci_core.h> #include <asm/unaligned.h> #include <net/rsi_91x.h> #include <net/genetlink.h> #define RSI_HEADROOM_FOR_BT_HAL 16 #define RSI_FRAME_DESC_SIZE 16 struct rsi_hci_adapter { void *priv; struct rsi_proto_ops *proto_ops; struct hci_dev *hdev; }; static int rsi_hci_open(struct hci_dev *hdev) { return 0; } static int rsi_hci_close(struct hci_dev *hdev) { return 0; } static int rsi_hci_flush(struct hci_dev *hdev) { return 0; } static int rsi_hci_send_pkt(struct hci_dev *hdev, struct sk_buff *skb) { struct rsi_hci_adapter *h_adapter = hci_get_drvdata(hdev); struct sk_buff *new_skb = NULL; switch (hci_skb_pkt_type(skb)) { case HCI_COMMAND_PKT: hdev->stat.cmd_tx++; break; case HCI_ACLDATA_PKT: hdev->stat.acl_tx++; break; case HCI_SCODATA_PKT: hdev->stat.sco_tx++; break; } if (skb_headroom(skb) < RSI_HEADROOM_FOR_BT_HAL) { /* Insufficient skb headroom - allocate a new skb */ new_skb = skb_realloc_headroom(skb, RSI_HEADROOM_FOR_BT_HAL); if (unlikely(!new_skb)) return -ENOMEM; bt_cb(new_skb)->pkt_type = hci_skb_pkt_type(skb); kfree_skb(skb); skb = new_skb; } return h_adapter->proto_ops->coex_send_pkt(h_adapter->priv, skb, RSI_BT_Q); } static int rsi_hci_recv_pkt(void *priv, const u8 *pkt) { struct rsi_hci_adapter *h_adapter = priv; struct hci_dev *hdev = h_adapter->hdev; struct sk_buff *skb; int pkt_len = get_unaligned_le16(pkt) & 0x0fff; skb = dev_alloc_skb(pkt_len); if (!skb) return -ENOMEM; memcpy(skb->data, pkt + RSI_FRAME_DESC_SIZE, pkt_len); skb_put(skb, pkt_len); h_adapter->hdev->stat.byte_rx += skb->len; hci_skb_pkt_type(skb) = pkt[14]; return hci_recv_frame(hdev, skb); } static int rsi_hci_attach(void *priv, struct rsi_proto_ops *ops) { struct rsi_hci_adapter *h_adapter = NULL; struct hci_dev *hdev; int err = 0; h_adapter = kzalloc(sizeof(*h_adapter), GFP_KERNEL); if (!h_adapter) return -ENOMEM; h_adapter->priv = priv; ops->set_bt_context(priv, h_adapter); h_adapter->proto_ops = ops; hdev = hci_alloc_dev(); if (!hdev) { BT_ERR("Failed to alloc HCI device"); goto err; } h_adapter->hdev = hdev; if (ops->get_host_intf(priv) == RSI_HOST_INTF_SDIO) hdev->bus = HCI_SDIO; else hdev->bus = HCI_USB; hci_set_drvdata(hdev, h_adapter); hdev->dev_type = HCI_PRIMARY; hdev->open = rsi_hci_open; hdev->close = rsi_hci_close; hdev->flush = rsi_hci_flush; hdev->send = rsi_hci_send_pkt; err = hci_register_dev(hdev); if (err < 0) { BT_ERR("HCI registration failed with errcode %d", err); hci_free_dev(hdev); goto err; } return 0; err: h_adapter->hdev = NULL; kfree(h_adapter); return -EINVAL; } static void rsi_hci_detach(void *priv) { struct rsi_hci_adapter *h_adapter = priv; struct hci_dev *hdev; if (!h_adapter) return; hdev = h_adapter->hdev; if (hdev) { hci_unregister_dev(hdev); hci_free_dev(hdev); h_adapter->hdev = NULL; } kfree(h_adapter); } const struct rsi_mod_ops rsi_bt_ops = { .attach = rsi_hci_attach, .detach = rsi_hci_detach, .recv_pkt = rsi_hci_recv_pkt, }; EXPORT_SYMBOL(rsi_bt_ops); static int rsi_91x_bt_module_init(void) { return 0; } static void rsi_91x_bt_module_exit(void) { return; } module_init(rsi_91x_bt_module_init); module_exit(rsi_91x_bt_module_exit); MODULE_AUTHOR("Redpine Signals Inc"); MODULE_DESCRIPTION("RSI BT driver"); MODULE_SUPPORTED_DEVICE("RSI-BT"); MODULE_LICENSE("Dual BSD/GPL");