/* * 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 *rx_skb; 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); } 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_set_bdaddr(struct hci_dev *hdev, const bdaddr_t *bdaddr) { struct sk_buff *skb; u8 buf[10]; int err; buf[0] = 0x01; buf[1] = 0x01; buf[2] = 0x00; buf[3] = sizeof(bdaddr_t); memcpy(buf + 4, bdaddr, sizeof(bdaddr_t)); skb = __hci_cmd_sync(hdev, 0xfc0b, sizeof(buf), buf, HCI_INIT_TIMEOUT); if (IS_ERR(skb)) { err = PTR_ERR(skb); BT_ERR("%s: Change address command failed (%d)", hdev->name, err); return err; } kfree_skb(skb); return 0; } 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_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, 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 (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); } static const struct hci_uart_proto athp = { .id = HCI_UART_ATH3K, .name = "ATH3K", .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); }