diff options
Diffstat (limited to 'drivers/bluetooth/hci_ath.c')
| -rw-r--r-- | drivers/bluetooth/hci_ath.c | 268 |
1 files changed, 268 insertions, 0 deletions
diff --git a/drivers/bluetooth/hci_ath.c b/drivers/bluetooth/hci_ath.c new file mode 100644 index 000000000..dbfe34664 --- /dev/null +++ b/drivers/bluetooth/hci_ath.c @@ -0,0 +1,268 @@ +// 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); + + if (!hci_uart_has_flow_control(hu)) + return -EOPNOTSUPP; + + 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); +} |