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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Atheros Communication Bluetooth HCIATH3K UART protocol
*
* HCIATH3K (HCI Atheros AR300x Protocol) is a Atheros Communication's
* power management protocol extension to H4 to support AR300x Bluetooth Chip.
*
* Copyright (c) 2009-2010 Atheros Communications Inc.
*
* Acknowledgements:
* This file is based on hci_h4.c, which was written
* by Maxim Krasnyansky and Marcel Holtmann.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/tty.h>
#include <linux/errno.h>
#include <linux/ioctl.h>
#include <linux/skbuff.h>
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include "hci_uart.h"
struct ath_struct {
struct hci_uart *hu;
unsigned int cur_sleep;
struct sk_buff *rx_skb;
struct sk_buff_head txq;
struct work_struct ctxtsw;
};
#define OP_WRITE_TAG 0x01
#define INDEX_BDADDR 0x01
struct ath_vendor_cmd {
__u8 opcode;
__le16 index;
__u8 len;
__u8 data[251];
} __packed;
static int ath_wakeup_ar3k(struct tty_struct *tty)
{
int status = tty->driver->ops->tiocmget(tty);
if (status & TIOCM_CTS)
return status;
/* Clear RTS first */
tty->driver->ops->tiocmget(tty);
tty->driver->ops->tiocmset(tty, 0x00, TIOCM_RTS);
msleep(20);
/* Set RTS, wake up board */
tty->driver->ops->tiocmget(tty);
tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00);
msleep(20);
status = tty->driver->ops->tiocmget(tty);
return status;
}
static void ath_hci_uart_work(struct work_struct *work)
{
int status;
struct ath_struct *ath;
struct hci_uart *hu;
struct tty_struct *tty;
ath = container_of(work, struct ath_struct, ctxtsw);
hu = ath->hu;
tty = hu->tty;
/* verify and wake up controller */
if (ath->cur_sleep) {
status = ath_wakeup_ar3k(tty);
if (!(status & TIOCM_CTS))
return;
}
/* Ready to send Data */
clear_bit(HCI_UART_SENDING, &hu->tx_state);
hci_uart_tx_wakeup(hu);
}
static int ath_open(struct hci_uart *hu)
{
struct ath_struct *ath;
BT_DBG("hu %p", hu);
ath = kzalloc(sizeof(*ath), GFP_KERNEL);
if (!ath)
return -ENOMEM;
skb_queue_head_init(&ath->txq);
hu->priv = ath;
ath->hu = hu;
INIT_WORK(&ath->ctxtsw, ath_hci_uart_work);
return 0;
}
static int ath_close(struct hci_uart *hu)
{
struct ath_struct *ath = hu->priv;
BT_DBG("hu %p", hu);
skb_queue_purge(&ath->txq);
kfree_skb(ath->rx_skb);
cancel_work_sync(&ath->ctxtsw);
hu->priv = NULL;
kfree(ath);
return 0;
}
static int ath_flush(struct hci_uart *hu)
{
struct ath_struct *ath = hu->priv;
BT_DBG("hu %p", hu);
skb_queue_purge(&ath->txq);
return 0;
}
static int ath_vendor_cmd(struct hci_dev *hdev, uint8_t opcode, uint16_t index,
const void *data, size_t dlen)
{
struct sk_buff *skb;
struct ath_vendor_cmd cmd;
if (dlen > sizeof(cmd.data))
return -EINVAL;
cmd.opcode = opcode;
cmd.index = cpu_to_le16(index);
cmd.len = dlen;
memcpy(cmd.data, data, dlen);
skb = __hci_cmd_sync(hdev, 0xfc0b, dlen + 4, &cmd, HCI_INIT_TIMEOUT);
if (IS_ERR(skb))
return PTR_ERR(skb);
kfree_skb(skb);
return 0;
}
static int ath_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr)
{
return ath_vendor_cmd(hdev, OP_WRITE_TAG, INDEX_BDADDR, bdaddr,
sizeof(*bdaddr));
}
static int ath_setup(struct hci_uart *hu)
{
BT_DBG("hu %p", hu);
hu->hdev->set_bdaddr = ath_set_bdaddr;
return 0;
}
static const struct h4_recv_pkt ath_recv_pkts[] = {
{ H4_RECV_ACL, .recv = hci_recv_frame },
{ H4_RECV_SCO, .recv = hci_recv_frame },
{ H4_RECV_EVENT, .recv = hci_recv_frame },
};
static int ath_recv(struct hci_uart *hu, const void *data, int count)
{
struct ath_struct *ath = hu->priv;
ath->rx_skb = h4_recv_buf(hu->hdev, ath->rx_skb, data, count,
ath_recv_pkts, ARRAY_SIZE(ath_recv_pkts));
if (IS_ERR(ath->rx_skb)) {
int err = PTR_ERR(ath->rx_skb);
bt_dev_err(hu->hdev, "Frame reassembly failed (%d)", err);
ath->rx_skb = NULL;
return err;
}
return count;
}
#define HCI_OP_ATH_SLEEP 0xFC04
static int ath_enqueue(struct hci_uart *hu, struct sk_buff *skb)
{
struct ath_struct *ath = hu->priv;
if (hci_skb_pkt_type(skb) == HCI_SCODATA_PKT) {
kfree_skb(skb);
return 0;
}
/* Update power management enable flag with parameters of
* HCI sleep enable vendor specific HCI command.
*/
if (hci_skb_pkt_type(skb) == HCI_COMMAND_PKT) {
struct hci_command_hdr *hdr = (void *)skb->data;
if (__le16_to_cpu(hdr->opcode) == HCI_OP_ATH_SLEEP)
ath->cur_sleep = skb->data[HCI_COMMAND_HDR_SIZE];
}
BT_DBG("hu %p skb %p", hu, skb);
/* Prepend skb with frame type */
memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
skb_queue_tail(&ath->txq, skb);
set_bit(HCI_UART_SENDING, &hu->tx_state);
schedule_work(&ath->ctxtsw);
return 0;
}
static struct sk_buff *ath_dequeue(struct hci_uart *hu)
{
struct ath_struct *ath = hu->priv;
return skb_dequeue(&ath->txq);
}
static const struct hci_uart_proto athp = {
.id = HCI_UART_ATH3K,
.name = "ATH3K",
.manufacturer = 69,
.open = ath_open,
.close = ath_close,
.flush = ath_flush,
.setup = ath_setup,
.recv = ath_recv,
.enqueue = ath_enqueue,
.dequeue = ath_dequeue,
};
int __init ath_init(void)
{
return hci_uart_register_proto(&athp);
}
int __exit ath_deinit(void)
{
return hci_uart_unregister_proto(&athp);
}
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