/* * * Bluetooth HCI UART driver * * Copyright (C) 2000-2001 Qualcomm Incorporated * Copyright (C) 2002-2003 Maxim Krasnyansky <maxk@qualcomm.com> * Copyright (C) 2004-2005 Marcel Holtmann <marcel@holtmann.org> * * * 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/types.h> #include <linux/fcntl.h> #include <linux/interrupt.h> #include <linux/ptrace.h> #include <linux/poll.h> #include <linux/slab.h> #include <linux/tty.h> #include <linux/errno.h> #include <linux/string.h> #include <linux/signal.h> #include <linux/ioctl.h> #include <linux/skbuff.h> #include <net/bluetooth/bluetooth.h> #include <net/bluetooth/hci_core.h> #include "hci_uart.h" #ifndef CONFIG_BT_HCIUART_DEBUG #undef BT_DBG #define BT_DBG( A... ) #endif #define VERSION "1.2" struct h4_struct { unsigned long rx_state; unsigned long rx_count; struct sk_buff *rx_skb; struct sk_buff_head txq; }; /* H4 receiver States */ #define H4_W4_PACKET_TYPE 0 #define H4_W4_EVENT_HDR 1 #define H4_W4_ACL_HDR 2 #define H4_W4_SCO_HDR 3 #define H4_W4_DATA 4 /* Initialize protocol */ static int h4_open(struct hci_uart *hu) { struct h4_struct *h4; BT_DBG("hu %p", hu); h4 = kzalloc(sizeof(*h4), GFP_ATOMIC); if (!h4) return -ENOMEM; skb_queue_head_init(&h4->txq); hu->priv = h4; return 0; } /* Flush protocol data */ static int h4_flush(struct hci_uart *hu) { struct h4_struct *h4 = hu->priv; BT_DBG("hu %p", hu); skb_queue_purge(&h4->txq); return 0; } /* Close protocol */ static int h4_close(struct hci_uart *hu) { struct h4_struct *h4 = hu->priv; hu->priv = NULL; BT_DBG("hu %p", hu); skb_queue_purge(&h4->txq); if (h4->rx_skb) kfree_skb(h4->rx_skb); hu->priv = NULL; kfree(h4); return 0; } /* Enqueue frame for transmittion (padding, crc, etc) */ static int h4_enqueue(struct hci_uart *hu, struct sk_buff *skb) { struct h4_struct *h4 = hu->priv; 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(&h4->txq, skb); return 0; } static inline int h4_check_data_len(struct h4_struct *h4, int len) { register int room = skb_tailroom(h4->rx_skb); BT_DBG("len %d room %d", len, room); if (!len) { hci_recv_frame(h4->rx_skb); } else if (len > room) { BT_ERR("Data length is too large"); kfree_skb(h4->rx_skb); } else { h4->rx_state = H4_W4_DATA; h4->rx_count = len; return len; } h4->rx_state = H4_W4_PACKET_TYPE; h4->rx_skb = NULL; h4->rx_count = 0; return 0; } /* Recv data */ static int h4_recv(struct hci_uart *hu, void *data, int count) { struct h4_struct *h4 = hu->priv; register char *ptr; struct hci_event_hdr *eh; struct hci_acl_hdr *ah; struct hci_sco_hdr *sh; register int len, type, dlen; BT_DBG("hu %p count %d rx_state %ld rx_count %ld", hu, count, h4->rx_state, h4->rx_count); ptr = data; while (count) { if (h4->rx_count) { len = min_t(unsigned int, h4->rx_count, count); memcpy(skb_put(h4->rx_skb, len), ptr, len); h4->rx_count -= len; count -= len; ptr += len; if (h4->rx_count) continue; switch (h4->rx_state) { case H4_W4_DATA: BT_DBG("Complete data"); hci_recv_frame(h4->rx_skb); h4->rx_state = H4_W4_PACKET_TYPE; h4->rx_skb = NULL; continue; case H4_W4_EVENT_HDR: eh = hci_event_hdr(h4->rx_skb); BT_DBG("Event header: evt 0x%2.2x plen %d", eh->evt, eh->plen); h4_check_data_len(h4, eh->plen); continue; case H4_W4_ACL_HDR: ah = hci_acl_hdr(h4->rx_skb); dlen = __le16_to_cpu(ah->dlen); BT_DBG("ACL header: dlen %d", dlen); h4_check_data_len(h4, dlen); continue; case H4_W4_SCO_HDR: sh = hci_sco_hdr(h4->rx_skb); BT_DBG("SCO header: dlen %d", sh->dlen); h4_check_data_len(h4, sh->dlen); continue; } } /* H4_W4_PACKET_TYPE */ switch (*ptr) { case HCI_EVENT_PKT: BT_DBG("Event packet"); h4->rx_state = H4_W4_EVENT_HDR; h4->rx_count = HCI_EVENT_HDR_SIZE; type = HCI_EVENT_PKT; break; case HCI_ACLDATA_PKT: BT_DBG("ACL packet"); h4->rx_state = H4_W4_ACL_HDR; h4->rx_count = HCI_ACL_HDR_SIZE; type = HCI_ACLDATA_PKT; break; case HCI_SCODATA_PKT: BT_DBG("SCO packet"); h4->rx_state = H4_W4_SCO_HDR; h4->rx_count = HCI_SCO_HDR_SIZE; type = HCI_SCODATA_PKT; break; default: BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr); hu->hdev->stat.err_rx++; ptr++; count--; continue; }; ptr++; count--; /* Allocate packet */ h4->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC); if (!h4->rx_skb) { BT_ERR("Can't allocate mem for new packet"); h4->rx_state = H4_W4_PACKET_TYPE; h4->rx_count = 0; return 0; } h4->rx_skb->dev = (void *) hu->hdev; bt_cb(h4->rx_skb)->pkt_type = type; } return count; } static struct sk_buff *h4_dequeue(struct hci_uart *hu) { struct h4_struct *h4 = hu->priv; return skb_dequeue(&h4->txq); } static struct hci_uart_proto h4p = { .id = HCI_UART_H4, .open = h4_open, .close = h4_close, .recv = h4_recv, .enqueue = h4_enqueue, .dequeue = h4_dequeue, .flush = h4_flush, }; int h4_init(void) { int err = hci_uart_register_proto(&h4p); if (!err) BT_INFO("HCI H4 protocol initialized"); else BT_ERR("HCI H4 protocol registration failed"); return err; } int h4_deinit(void) { return hci_uart_unregister_proto(&h4p); }