| /* |
| * 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. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| * |
| */ |
| |
| #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_head txq; |
| struct work_struct ctxtsw; |
| }; |
| |
| 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); |
| mdelay(20); |
| |
| /* Set RTS, wake up board */ |
| tty->driver->ops->tiocmget(tty); |
| tty->driver->ops->tiocmset(tty, TIOCM_RTS, 0x00); |
| mdelay(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); |
| } |
| |
| /* Initialize protocol */ |
| 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; |
| } |
| |
| /* Flush protocol data */ |
| 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; |
| } |
| |
| /* Close protocol */ |
| static int ath_close(struct hci_uart *hu) |
| { |
| struct ath_struct *ath = hu->priv; |
| |
| BT_DBG("hu %p", hu); |
| |
| skb_queue_purge(&ath->txq); |
| |
| cancel_work_sync(&ath->ctxtsw); |
| |
| hu->priv = NULL; |
| kfree(ath); |
| |
| return 0; |
| } |
| |
| #define HCI_OP_ATH_SLEEP 0xFC04 |
| |
| /* Enqueue frame for transmittion */ |
| static int ath_enqueue(struct hci_uart *hu, struct sk_buff *skb) |
| { |
| struct ath_struct *ath = hu->priv; |
| |
| if (bt_cb(skb)->pkt_type == HCI_SCODATA_PKT) { |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| /* |
| * Update power management enable flag with parameters of |
| * HCI sleep enable vendor specific HCI command. |
| */ |
| if (bt_cb(skb)->pkt_type == 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), &bt_cb(skb)->pkt_type, 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); |
| } |
| |
| /* Recv data */ |
| static int ath_recv(struct hci_uart *hu, const void *data, int count) |
| { |
| int ret; |
| |
| ret = hci_recv_stream_fragment(hu->hdev, data, count); |
| if (ret < 0) { |
| BT_ERR("Frame Reassembly Failed"); |
| return ret; |
| } |
| |
| return count; |
| } |
| |
| static struct hci_uart_proto athp = { |
| .id = HCI_UART_ATH3K, |
| .open = ath_open, |
| .close = ath_close, |
| .recv = ath_recv, |
| .enqueue = ath_enqueue, |
| .dequeue = ath_dequeue, |
| .flush = ath_flush, |
| }; |
| |
| int __init ath_init(void) |
| { |
| int err = hci_uart_register_proto(&athp); |
| |
| if (!err) |
| BT_INFO("HCIATH3K protocol initialized"); |
| else |
| BT_ERR("HCIATH3K protocol registration failed"); |
| |
| return err; |
| } |
| |
| int __exit ath_deinit(void) |
| { |
| return hci_uart_unregister_proto(&athp); |
| } |