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/*
* 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_DMA_ALIGN 8
#define RSI_FRAME_DESC_SIZE 16
#define RSI_HEADROOM_FOR_BT_HAL (RSI_FRAME_DESC_SIZE + RSI_DMA_ALIGN)
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;
if (!IS_ALIGNED((unsigned long)skb->data, RSI_DMA_ALIGN)) {
u8 *skb_data = skb->data;
int skb_len = skb->len;
skb_push(skb, RSI_DMA_ALIGN);
skb_pull(skb, PTR_ALIGN(skb->data,
RSI_DMA_ALIGN) - skb->data);
memmove(skb->data, skb_data, skb_len);
skb_trim(skb, skb_len);
}
}
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_LICENSE("Dual BSD/GPL");
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