hci_core.c

基于liunx的蓝牙协议栈源代码版本為2.13,可以方便的下載和移植！

/* 
   BlueZ - Bluetooth protocol stack for Linux
   Copyright (C) 2000-2001 Qualcomm Incorporated

   Written 2000,2001 by Maxim Krasnyansky <[e-mail]>

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License version 2 as
   published by the Free Software Foundation;

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT OF THIRD PARTY RIGHTS.
   IN NO EVENT SHALL THE COPYRIGHT HOLDER(S) AND AUTHOR(S) BE LIABLE FOR ANY
   CLAIM, OR ANY SPECIAL INDIRECT OR CONSEQUENTIAL DAMAGES, OR ANY DAMAGES 
   WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 
   ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 
   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

   ALL LIABILITY, INCLUDING LIABILITY FOR INFRINGEMENT OF ANY PATENTS, 
   COPYRIGHTS, TRADEMARKS OR OTHER RIGHTS, RELATING TO USE OF THIS 
   SOFTWARE IS DISCLAIMED.
*/

/*
 * BlueZ HCI Core.
 *
 * $Id: hci_core.c,v 1.14 2002/08/26 16:57:57 maxk Exp $
 */

#include <linux/config.h>
#include <linux/module.h>
#include <linux/kmod.h>

#include <linux/types.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/major.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/poll.h>
#include <linux/fcntl.h>
#include <linux/init.h>
#include <linux/skbuff.h>
#include <linux/interrupt.h>
#include <linux/notifier.h>
#include <net/sock.h>

#include <asm/system.h>
#include <asm/uaccess.h>
#include <asm/unaligned.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>

#ifndef HCI_CORE_DEBUG
#undef  BT_DBG
#define BT_DBG( A... )
#endif

static void hci_cmd_task(unsigned long arg);
static void hci_rx_task(unsigned long arg);
static void hci_tx_task(unsigned long arg);
static void hci_notify(struct hci_dev *hdev, int event);

rwlock_t hci_task_lock = RW_LOCK_UNLOCKED;

/* HCI device list */
LIST_HEAD(hdev_list);
rwlock_t hdev_list_lock = RW_LOCK_UNLOCKED;

/* HCI protocols */
#define HCI_MAX_PROTO	2
struct hci_proto *hci_proto[HCI_MAX_PROTO];

/* HCI notifiers list */
static struct notifier_block *hci_notifier;


/* ---- HCI notifications ---- */

int hci_register_notifier(struct notifier_block *nb)
{
	return notifier_chain_register(&hci_notifier, nb);
}

int hci_unregister_notifier(struct notifier_block *nb)
{
	return notifier_chain_unregister(&hci_notifier, nb);
}

void hci_notify(struct hci_dev *hdev, int event)
{
	notifier_call_chain(&hci_notifier, event, hdev);
}

/* ---- HCI hotplug support ---- */

#ifdef CONFIG_HOTPLUG

static int hci_run_hotplug(char *dev, char *action)
{
	char *argv[3], *envp[5], dstr[20], astr[32];

	sprintf(dstr, "DEVICE=%s", dev);
	sprintf(astr, "ACTION=%s", action);

        argv[0] = hotplug_path;
        argv[1] = "bluetooth";
        argv[2] = NULL;

	envp[0] = "HOME=/";
	envp[1] = "PATH=/sbin:/bin:/usr/sbin:/usr/bin";
	envp[2] = dstr;
	envp[3] = astr;
	envp[4] = NULL;
	
	return call_usermodehelper(argv[0], argv, envp);
}
#else
#define hci_run_hotplug(A...)
#endif

/* ---- HCI requests ---- */

void hci_req_complete(struct hci_dev *hdev, int result)
{
	BT_DBG("%s result 0x%2.2x", hdev->name, result);

	if (hdev->req_status == HCI_REQ_PEND) {
		hdev->req_result = result;
		hdev->req_status = HCI_REQ_DONE;
		wake_up_interruptible(&hdev->req_wait_q);
	}
}

void hci_req_cancel(struct hci_dev *hdev, int err)
{
	BT_DBG("%s err 0x%2.2x", hdev->name, err);

	if (hdev->req_status == HCI_REQ_PEND) {
		hdev->req_result = err;
		hdev->req_status = HCI_REQ_CANCELED;
		wake_up_interruptible(&hdev->req_wait_q);
	}
}

/* Execute request and wait for completion. */
static int __hci_request(struct hci_dev *hdev, void (*req)(struct hci_dev *hdev, unsigned long opt), unsigned long opt, __u32 timeout)
{
	DECLARE_WAITQUEUE(wait, current);
	int err = 0;

	BT_DBG("%s start", hdev->name);

	hdev->req_status = HCI_REQ_PEND;

	add_wait_queue(&hdev->req_wait_q, &wait);
	set_current_state(TASK_INTERRUPTIBLE);

	req(hdev, opt);
	schedule_timeout(timeout);

	set_current_state(TASK_RUNNING);
	remove_wait_queue(&hdev->req_wait_q, &wait);

	if (signal_pending(current))
		return -EINTR;

	switch (hdev->req_status) {
	case HCI_REQ_DONE:
		err = -bterr(hdev->req_result);
		break;

	case HCI_REQ_CANCELED:
		err = -hdev->req_result;
		break;

	default:
		err = -ETIMEDOUT;
		break;
	};

	hdev->req_status = hdev->req_result = 0;

	BT_DBG("%s end: err %d", hdev->name, err);

	return err;
}

static inline int hci_request(struct hci_dev *hdev, void (*req)(struct hci_dev *hdev, unsigned long opt),
                                  unsigned long opt, __u32 timeout)
{
	int ret;

	/* Serialize all requests */
	hci_req_lock(hdev);
	ret = __hci_request(hdev, req, opt, timeout);
	hci_req_unlock(hdev);

	return ret;
}

static void hci_reset_req(struct hci_dev *hdev, unsigned long opt)
{
	BT_DBG("%s %ld", hdev->name, opt);

	/* Reset device */
	hci_send_cmd(hdev, OGF_HOST_CTL, OCF_RESET, 0, NULL);
}

static void hci_init_req(struct hci_dev *hdev, unsigned long opt)
{
	set_event_flt_cp ef;
	__u16 param;

	BT_DBG("%s %ld", hdev->name, opt);

	/* Mandatory initialization */

	/* Read Local Supported Features */
	hci_send_cmd(hdev, OGF_INFO_PARAM, OCF_READ_LOCAL_FEATURES, 0, NULL);

	/* Read Buffer Size (ACL mtu, max pkt, etc.) */
	hci_send_cmd(hdev, OGF_INFO_PARAM, OCF_READ_BUFFER_SIZE, 0, NULL);

#if 0
	/* Host buffer size */
	{
		host_buffer_size_cp bs;
		bs.acl_mtu = __cpu_to_le16(HCI_MAX_ACL_SIZE);
		bs.sco_mtu = HCI_MAX_SCO_SIZE;
		bs.acl_max_pkt = __cpu_to_le16(0xffff);
		bs.sco_max_pkt = __cpu_to_le16(0xffff);
		hci_send_cmd(hdev, OGF_HOST_CTL, OCF_HOST_BUFFER_SIZE,
				HOST_BUFFER_SIZE_CP_SIZE, &bs);
	}
#endif

	/* Read BD Address */
	hci_send_cmd(hdev, OGF_INFO_PARAM, OCF_READ_BD_ADDR, 0, NULL);

	/* Optional initialization */

	/* Clear Event Filters */
	ef.flt_type  = FLT_CLEAR_ALL;
	hci_send_cmd(hdev, OGF_HOST_CTL, OCF_SET_EVENT_FLT, 1, &ef);

	/* Page timeout ~20 secs */
	param = __cpu_to_le16(0x8000);
	hci_send_cmd(hdev, OGF_HOST_CTL, OCF_WRITE_PG_TIMEOUT, 2, &param);

	/* Connection accept timeout ~20 secs */
	param = __cpu_to_le16(0x7d00);
	hci_send_cmd(hdev, OGF_HOST_CTL, OCF_WRITE_CA_TIMEOUT, 2, &param);
}

static void hci_scan_req(struct hci_dev *hdev, unsigned long opt)
{
	__u8 scan = opt;

	BT_DBG("%s %x", hdev->name, scan);

	/* Inquiry and Page scans */
	hci_send_cmd(hdev, OGF_HOST_CTL, OCF_WRITE_SCAN_ENABLE, 1, &scan);
}

static void hci_auth_req(struct hci_dev *hdev, unsigned long opt)
{
	__u8 auth = opt;

	BT_DBG("%s %x", hdev->name, auth);

	/* Authentication */
	hci_send_cmd(hdev, OGF_HOST_CTL, OCF_WRITE_AUTH_ENABLE, 1, &auth);
}

static void hci_encrypt_req(struct hci_dev *hdev, unsigned long opt)
{
	__u8 encrypt = opt;

	BT_DBG("%s %x", hdev->name, encrypt);

	/* Authentication */
	hci_send_cmd(hdev, OGF_HOST_CTL, OCF_WRITE_ENCRYPT_MODE, 1, &encrypt);
}

/* Get HCI device by index. 
 * Device is locked on return. */
struct hci_dev *hci_dev_get(int index)
{
	struct hci_dev *hdev;
	struct list_head *p;

	BT_DBG("%d", index);

	if (index < 0)
		return NULL;

	read_lock(&hdev_list_lock);
	list_for_each(p, &hdev_list) {
		hdev = list_entry(p, struct hci_dev, list);
		if (hdev->id == index) {
			hci_dev_hold(hdev);
			goto done;
		}
	}
	hdev = NULL;
done:
	read_unlock(&hdev_list_lock);
	return hdev;
}

/* ---- Inquiry support ---- */
void inquiry_cache_flush(struct hci_dev *hdev)
{
	struct inquiry_cache *cache = &hdev->inq_cache;
	struct inquiry_entry *next  = cache->list, *e;

	BT_DBG("cache %p", cache);

	cache->list = NULL;
	while ((e = next)) {
		next = e->next;
		kfree(e);
	}
}

struct inquiry_entry *inquiry_cache_lookup(struct hci_dev *hdev, bdaddr_t *bdaddr)
{
	struct inquiry_cache *cache = &hdev->inq_cache;
	struct inquiry_entry *e;

	BT_DBG("cache %p, %s", cache, batostr(bdaddr));

	for (e = cache->list; e; e = e->next)
		if (!bacmp(&e->info.bdaddr, bdaddr))
			break;
	return e;
}

void inquiry_cache_update(struct hci_dev *hdev, inquiry_info *info)
{
	struct inquiry_cache *cache = &hdev->inq_cache;
	struct inquiry_entry *e;

	BT_DBG("cache %p, %s", cache, batostr(&info->bdaddr));

	if (!(e = inquiry_cache_lookup(hdev, &info->bdaddr))) {
		/* Entry not in the cache. Add new one. */
		if (!(e = kmalloc(sizeof(struct inquiry_entry), GFP_ATOMIC)))
			return;
		memset(e, 0, sizeof(struct inquiry_entry));
		e->next     = cache->list;
		cache->list = e;
	}

	memcpy(&e->info, info, sizeof(inquiry_info));
	e->timestamp = jiffies;
	cache->timestamp = jiffies;
}

int inquiry_cache_dump(struct hci_dev *hdev, int num, __u8 *buf)
{
	struct inquiry_cache *cache = &hdev->inq_cache;
	inquiry_info *info = (inquiry_info *) buf;
	struct inquiry_entry *e;
	int copied = 0;

	for (e = cache->list; e && copied < num; e = e->next, copied++)
		memcpy(info++, &e->info, sizeof(inquiry_info));

	BT_DBG("cache %p, copied %d", cache, copied);
	return copied;
}

static void hci_inq_req(struct hci_dev *hdev, unsigned long opt)
{
	struct hci_inquiry_req *ir = (struct hci_inquiry_req *) opt;
	inquiry_cp ic;

	BT_DBG("%s", hdev->name);

	if (test_bit(HCI_INQUIRY, &hdev->flags))
		return;

	/* Start Inquiry */
	memcpy(&ic.lap, &ir->lap, 3);
	ic.length  = ir->length;
	ic.num_rsp = ir->num_rsp;
	hci_send_cmd(hdev, OGF_LINK_CTL, OCF_INQUIRY, INQUIRY_CP_SIZE, &ic);
}

int hci_inquiry(unsigned long arg)
{
	struct hci_inquiry_req ir;
	struct hci_dev *hdev;
	int err = 0, do_inquiry = 0, max_rsp;
	long timeo;
	__u8 *buf, *ptr;

	ptr = (void *) arg;
	if (copy_from_user(&ir, ptr, sizeof(ir)))
		return -EFAULT;

	if (!(hdev = hci_dev_get(ir.dev_id)))
		return -ENODEV;

	hci_dev_lock_bh(hdev);
	if (inquiry_cache_age(hdev) > INQUIRY_CACHE_AGE_MAX || 
					ir.flags & IREQ_CACHE_FLUSH) {
		inquiry_cache_flush(hdev);
		do_inquiry = 1;
	}
	hci_dev_unlock_bh(hdev);

	timeo = ir.length * 2 * HZ;
	if (do_inquiry && (err = hci_request(hdev, hci_inq_req, (unsigned long)&ir, timeo)) < 0)
		goto done;

	/* for unlimited number of responses we will use buffer with 255 entries */
	max_rsp = (ir.num_rsp == 0) ? 255 : ir.num_rsp;

	/* cache_dump can't sleep. Therefore we allocate temp buffer and then
	 * copy it to the user space.
	 */
	if (!(buf = kmalloc(sizeof(inquiry_info) * max_rsp, GFP_KERNEL))) {
		err = -ENOMEM;
		goto done;
	}

	hci_dev_lock_bh(hdev);
	ir.num_rsp = inquiry_cache_dump(hdev, max_rsp, buf);
	hci_dev_unlock_bh(hdev);

	BT_DBG("num_rsp %d", ir.num_rsp);

	if (!verify_area(VERIFY_WRITE, ptr, sizeof(ir) + 
				(sizeof(inquiry_info) * ir.num_rsp))) {
		copy_to_user(ptr, &ir, sizeof(ir));
		ptr += sizeof(ir);
	        copy_to_user(ptr, buf, sizeof(inquiry_info) * ir.num_rsp);
	} else 
		err = -EFAULT;

	kfree(buf);

done:
	hci_dev_put(hdev);
	return err;
}

/* ---- HCI ioctl helpers ---- */

int hci_dev_open(__u16 dev)
{
	struct hci_dev *hdev;
	int ret = 0;

	if (!(hdev = hci_dev_get(dev)))
		return -ENODEV;

	BT_DBG("%s %p", hdev->name, hdev);

	hci_req_lock(hdev);

	if (test_bit(HCI_UP, &hdev->flags)) {
		ret = -EALREADY;
		goto done;
	}