diff options
Diffstat (limited to 'net/bluetooth/hci_core.c')
| -rw-r--r-- | net/bluetooth/hci_core.c | 1434 |
1 files changed, 1434 insertions, 0 deletions
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c new file mode 100644 index 0000000..860dba7 --- /dev/null +++ b/net/bluetooth/hci_core.c @@ -0,0 +1,1434 @@ +/* + BlueZ - Bluetooth protocol stack for Linux + Copyright (C) 2000-2001 Qualcomm Incorporated + + Written 2000,2001 by Maxim Krasnyansky <maxk@qualcomm.com> + + 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. +*/ + +/* Bluetooth HCI core. */ + +#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 CONFIG_BT_HCI_CORE_DEBUG +#undef BT_DBG +#define BT_DBG(D...) +#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); + +static DEFINE_RWLOCK(hci_task_lock); + +/* HCI device list */ +LIST_HEAD(hci_dev_list); +DEFINE_RWLOCK(hci_dev_list_lock); + +/* HCI callback list */ +LIST_HEAD(hci_cb_list); +DEFINE_RWLOCK(hci_cb_list_lock); + +/* 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 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); + } +} + +static 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); + + remove_wait_queue(&hdev->req_wait_q, &wait); + + if (signal_pending(current)) + return -EINTR; + + switch (hdev->req_status) { + case HCI_REQ_DONE: + err = -bt_err(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) +{ + struct sk_buff *skb; + __u16 param; + + BT_DBG("%s %ld", hdev->name, opt); + + /* Driver initialization */ + + /* Special commands */ + while ((skb = skb_dequeue(&hdev->driver_init))) { + skb->pkt_type = HCI_COMMAND_PKT; + skb->dev = (void *) hdev; + skb_queue_tail(&hdev->cmd_q, skb); + hci_sched_cmd(hdev); + } + skb_queue_purge(&hdev->driver_init); + + /* Mandatory initialization */ + + /* Reset */ + if (test_bit(HCI_QUIRK_RESET_ON_INIT, &hdev->quirks)) + hci_send_cmd(hdev, OGF_HOST_CTL, OCF_RESET, 0, NULL); + + /* 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 */ + { + struct hci_cp_host_buffer_size cp; + cp.acl_mtu = __cpu_to_le16(HCI_MAX_ACL_SIZE); + cp.sco_mtu = HCI_MAX_SCO_SIZE; + cp.acl_max_pkt = __cpu_to_le16(0xffff); + cp.sco_max_pkt = __cpu_to_le16(0xffff); + hci_send_cmd(hdev, OGF_HOST_CTL, OCF_HOST_BUFFER_SIZE, sizeof(cp), &cp); + } +#endif + + /* Read BD Address */ + hci_send_cmd(hdev, OGF_INFO_PARAM, OCF_READ_BD_ADDR, 0, NULL); + + /* Read Voice Setting */ + hci_send_cmd(hdev, OGF_HOST_CTL, OCF_READ_VOICE_SETTING, 0, NULL); + + /* Optional initialization */ + + /* Clear Event Filters */ + { + struct hci_cp_set_event_flt cp; + cp.flt_type = HCI_FLT_CLEAR_ALL; + hci_send_cmd(hdev, OGF_HOST_CTL, OCF_SET_EVENT_FLT, sizeof(cp), &cp); + } + + /* Page timeout ~20 secs */ + param = __cpu_to_le16(0x8000); + hci_send_cmd(hdev, OGF_HOST_CTL, OCF_WRITE_PG_TIMEOUT, 2, ¶m); + + /* Connection accept timeout ~20 secs */ + param = __cpu_to_le16(0x7d00); + hci_send_cmd(hdev, OGF_HOST_CTL, OCF_WRITE_CA_TIMEOUT, 2, ¶m); +} + +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 held on return. */ +struct hci_dev *hci_dev_get(int index) +{ + struct hci_dev *hdev = NULL; + struct list_head *p; + + BT_DBG("%d", index); + + if (index < 0) + return NULL; + + read_lock(&hci_dev_list_lock); + list_for_each(p, &hci_dev_list) { + struct hci_dev *d = list_entry(p, struct hci_dev, list); + if (d->id == index) { + hdev = hci_dev_hold(d); + break; + } + } + read_unlock(&hci_dev_list_lock); + return hdev; +} +EXPORT_SYMBOL(hci_dev_get); + +/* ---- Inquiry support ---- */ +static 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 *hci_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->data.bdaddr, bdaddr)) + break; + return e; +} + +void hci_inquiry_cache_update(struct hci_dev *hdev, struct inquiry_data *data) +{ + struct inquiry_cache *cache = &hdev->inq_cache; + struct inquiry_entry *e; + + BT_DBG("cache %p, %s", cache, batostr(&data->bdaddr)); + + if (!(e = hci_inquiry_cache_lookup(hdev, &data->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->data, data, sizeof(*data)); + e->timestamp = jiffies; + cache->timestamp = jiffies; +} + +static int inquiry_cache_dump(struct hci_dev *hdev, int num, __u8 *buf) +{ + struct inquiry_cache *cache = &hdev->inq_cache; + struct inquiry_info *info = (struct inquiry_info *) buf; + struct inquiry_entry *e; + int copied = 0; + + for (e = cache->list; e && copied < num; e = e->next, copied++) { + struct inquiry_data *data = &e->data; + bacpy(&info->bdaddr, &data->bdaddr); + info->pscan_rep_mode = data->pscan_rep_mode; + info->pscan_period_mode = data->pscan_period_mode; + info->pscan_mode = data->pscan_mode; + memcpy(info->dev_class, data->dev_class, 3); + info->clock_offset = data->clock_offset; + 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; + struct hci_cp_inquiry cp; + + BT_DBG("%s", hdev->name); + + if (test_bit(HCI_INQUIRY, &hdev->flags)) + return; + + /* Start Inquiry */ + memcpy(&cp.lap, &ir->lap, 3); + cp.length = ir->length; + cp.num_rsp = ir->num_rsp; + hci_send_cmd(hdev, OGF_LINK_CTL, OCF_INQUIRY, sizeof(cp), &cp); +} + +int hci_inquiry(void __user *arg) +{ + __u8 __user *ptr = arg; + struct hci_inquiry_req ir; + struct hci_dev *hdev; + int err = 0, do_inquiry = 0, max_rsp; + long timeo; + __u8 *buf; + + 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 || + inquiry_cache_empty(hdev) || + 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(struct 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 (!copy_to_user(ptr, &ir, sizeof(ir))) { + ptr += sizeof(ir); + if (copy_to_user(ptr, buf, sizeof(struct inquiry_info) * + ir.num_rsp)) + err = -EFAULT; + } 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; + } + + if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks)) + set_bit(HCI_RAW, &hdev->flags); + + if (hdev->open(hdev)) { + ret = -EIO; + goto done; + } + + if (!test_bit(HCI_RAW, &hdev->flags)) { + atomic_set(&hdev->cmd_cnt, 1); + set_bit(HCI_INIT, &hdev->flags); + + //__hci_request(hdev, hci_reset_req, 0, HZ); + ret = __hci_request(hdev, hci_init_req, 0, HCI_INIT_TIMEOUT); + + clear_bit(HCI_INIT, &hdev->flags); + } + + if (!ret) { + hci_dev_hold(hdev); + set_bit(HCI_UP, &hdev->flags); + hci_notify(hdev, HCI_DEV_UP); + } else { + /* Init failed, cleanup */ + tasklet_kill(&hdev->rx_task); + tasklet_kill(&hdev->tx_task); + tasklet_kill(&hdev->cmd_task); + + skb_queue_purge(&hdev->cmd_q); + skb_queue_purge(&hdev->rx_q); + + if (hdev->flush) + hdev->flush(hdev); + + if (hdev->sent_cmd) { + kfree_skb(hdev->sent_cmd); + hdev->sent_cmd = NULL; + } + + hdev->close(hdev); + hdev->flags = 0; + } + +done: + hci_req_unlock(hdev); + hci_dev_put(hdev); + return ret; +} + +static int hci_dev_do_close(struct hci_dev *hdev) +{ + BT_DBG("%s %p", hdev->name, hdev); + + hci_req_cancel(hdev, ENODEV); + hci_req_lock(hdev); + + if (!test_and_clear_bit(HCI_UP, &hdev->flags)) { + hci_req_unlock(hdev); + return 0; + } + + /* Kill RX and TX tasks */ + tasklet_kill(&hdev->rx_task); + tasklet_kill(&hdev->tx_task); + + hci_dev_lock_bh(hdev); + inquiry_cache_flush(hdev); + hci_conn_hash_flush(hdev); + hci_dev_unlock_bh(hdev); + + hci_notify(hdev, HCI_DEV_DOWN); + + if (hdev->flush) + hdev->flush(hdev); + + /* Reset device */ + skb_queue_purge(&hdev->cmd_q); + atomic_set(&hdev->cmd_cnt, 1); + if (!test_bit(HCI_RAW, &hdev->flags)) { + set_bit(HCI_INIT, &hdev->flags); + __hci_request(hdev, hci_reset_req, 0, HZ/4); + clear_bit(HCI_INIT, &hdev->flags); + } + + /* Kill cmd task */ + tasklet_kill(&hdev->cmd_task); + + /* Drop queues */ + skb_queue_purge(&hdev->rx_q); + skb_queue_purge(&hdev->cmd_q); + skb_queue_purge(&hdev->raw_q); + + /* Drop last sent command */ + if (hdev->sent_cmd) { + kfree_skb(hdev->sent_cmd); + hdev->sent_cmd = NULL; + } + + /* After this point our queues are empty + * and no tasks are scheduled. */ + hdev->close(hdev); + + /* Clear flags */ + hdev->flags = 0; + + hci_req_unlock(hdev); + + hci_dev_put(hdev); + return 0; +} + +int hci_dev_close(__u16 dev) +{ + struct hci_dev *hdev; + int err; + + if (!(hdev = hci_dev_get(dev))) + return -ENODEV; + err = hci_dev_do_close(hdev); + hci_dev_put(hdev); + return err; +} + +int hci_dev_reset(__u16 dev) +{ + struct hci_dev *hdev; + int ret = 0; + + if (!(hdev = hci_dev_get(dev))) + return -ENODEV; + + hci_req_lock(hdev); + tasklet_disable(&hdev->tx_task); + + if (!test_bit(HCI_UP, &hdev->flags)) + goto done; + + /* Drop queues */ + skb_queue_purge(&hdev->rx_q); + skb_queue_purge(&hdev->cmd_q); + + hci_dev_lock_bh(hdev); + inquiry_cache_flush(hdev); + hci_conn_hash_flush(hdev); + hci_dev_unlock_bh(hdev); + + if (hdev->flush) + hdev->flush(hdev); + + atomic_set(&hdev->cmd_cnt, 1); + hdev->acl_cnt = 0; hdev->sco_cnt = 0; + + if (!test_bit(HCI_RAW, &hdev->flags)) + ret = __hci_request(hdev, hci_reset_req, 0, HCI_INIT_TIMEOUT); + +done: + tasklet_enable(&hdev->tx_task); + hci_req_unlock(hdev); + hci_dev_put(hdev); + return ret; +} + +int hci_dev_reset_stat(__u16 dev) +{ + struct hci_dev *hdev; + int ret = 0; + + if (!(hdev = hci_dev_get(dev))) + return -ENODEV; + + memset(&hdev->stat, 0, sizeof(struct hci_dev_stats)); + + hci_dev_put(hdev); + + return ret; +} + +int hci_dev_cmd(unsigned int cmd, void __user *arg) +{ + struct hci_dev *hdev; + struct hci_dev_req dr; + int err = 0; + + if (copy_from_user(&dr, arg, sizeof(dr))) + return -EFAULT; + + if (!(hdev = hci_dev_get(dr.dev_id))) + return -ENODEV; + + switch (cmd) { + case HCISETAUTH: + err = hci_request(hdev, hci_auth_req, dr.dev_opt, HCI_INIT_TIMEOUT); + break; + + case HCISETENCRYPT: + if (!lmp_encrypt_capable(hdev)) { + err = -EOPNOTSUPP; + break; + } + + if (!test_bit(HCI_AUTH, &hdev->flags)) { + /* Auth must be enabled first */ + err = hci_request(hdev, hci_auth_req, + dr.dev_opt, HCI_INIT_TIMEOUT); + if (err) + break; + } + + err = hci_request(hdev, hci_encrypt_req, + dr.dev_opt, HCI_INIT_TIMEOUT); + break; + + case HCISETSCAN: + err = hci_request(hdev, hci_scan_req, dr.dev_opt, HCI_INIT_TIMEOUT); + break; + + case HCISETPTYPE: + hdev->pkt_type = (__u16) dr.dev_opt; + break; + + case HCISETLINKPOL: + hdev->link_policy = (__u16) dr.dev_opt; + break; + + case HCISETLINKMODE: + hdev->link_mode = ((__u16) dr.dev_opt) & (HCI_LM_MASTER | HCI_LM_ACCEPT); + break; + + case HCISETACLMTU: + hdev->acl_mtu = *((__u16 *)&dr.dev_opt + 1); + hdev->acl_pkts = *((__u16 *)&dr.dev_opt + 0); + break; + + case HCISETSCOMTU: + hdev->sco_mtu = *((__u16 *)&dr.dev_opt + 1); + hdev->sco_pkts = *((__u16 *)&dr.dev_opt + 0); + break; + + default: + err = -EINVAL; + break; + } + hci_dev_put(hdev); + return err; +} + +int hci_get_dev_list(void __user *arg) +{ + struct hci_dev_list_req *dl; + struct hci_dev_req *dr; + struct list_head *p; + int n = 0, size, err; + __u16 dev_num; + + if (get_user(dev_num, (__u16 __user *) arg)) + return -EFAULT; + + if (!dev_num || dev_num > (PAGE_SIZE * 2) / sizeof(*dr)) + return -EINVAL; + + size = sizeof(*dl) + dev_num * sizeof(*dr); + + if (!(dl = kmalloc(size, GFP_KERNEL))) + return -ENOMEM; + + dr = dl->dev_req; + + read_lock_bh(&hci_dev_list_lock); + list_for_each(p, &hci_dev_list) { + struct hci_dev *hdev; + hdev = list_entry(p, struct hci_dev, list); + (dr + n)->dev_id = hdev->id; + (dr + n)->dev_opt = hdev->flags; + if (++n >= dev_num) + break; + } + read_unlock_bh(&hci_dev_list_lock); + + dl->dev_num = n; + size = sizeof(*dl) + n * sizeof(*dr); + + err = copy_to_user(arg, dl, size); + kfree(dl); + + return err ? -EFAULT : 0; +} + +int hci_get_dev_info(void __user *arg) +{ + struct hci_dev *hdev; + struct hci_dev_info di; + int err = 0; + + if (copy_from_user(&di, arg, sizeof(di))) + return -EFAULT; + + if (!(hdev = hci_dev_get(di.dev_id))) + return -ENODEV; + + strcpy(di.name, hdev->name); + di.bdaddr = hdev->bdaddr; + di.type = hdev->type; + di.flags = hdev->flags; + di.pkt_type = hdev->pkt_type; + di.acl_mtu = hdev->acl_mtu; + di.acl_pkts = hdev->acl_pkts; + di.sco_mtu = hdev->sco_mtu; + di.sco_pkts = hdev->sco_pkts; + di.link_policy = hdev->link_policy; + di.link_mode = hdev->link_mode; + + memcpy(&di.stat, &hdev->stat, sizeof(di.stat)); + memcpy(&di.features, &hdev->features, sizeof(di.features)); + + if (copy_to_user(arg, &di, sizeof(di))) + err = -EFAULT; + + hci_dev_put(hdev); + + return err; +} + +/* ---- Interface to HCI drivers ---- */ + +/* Alloc HCI device */ +struct hci_dev *hci_alloc_dev(void) +{ + struct hci_dev *hdev; + + hdev = kmalloc(sizeof(struct hci_dev), GFP_KERNEL); + if (!hdev) + return NULL; + + memset(hdev, 0, sizeof(struct hci_dev)); + + skb_queue_head_init(&hdev->driver_init); + + return hdev; +} +EXPORT_SYMBOL(hci_alloc_dev); + +/* Free HCI device */ +void hci_free_dev(struct hci_dev *hdev) +{ + skb_queue_purge(&hdev->driver_init); + + /* will free via class release */ + class_device_put(&hdev->class_dev); +} +EXPORT_SYMBOL(hci_free_dev); + +/* Register HCI device */ +int hci_register_dev(struct hci_dev *hdev) +{ + struct list_head *head = &hci_dev_list, *p; + int id = 0; + + BT_DBG("%p name %s type %d owner %p", hdev, hdev->name, hdev->type, hdev->owner); + + if (!hdev->open || !hdev->close || !hdev->destruct) + return -EINVAL; + + write_lock_bh(&hci_dev_list_lock); + + /* Find first available device id */ + list_for_each(p, &hci_dev_list) { + if (list_entry(p, struct hci_dev, list)->id != id) + break; + head = p; id++; + } + + sprintf(hdev->name, "hci%d", id); + hdev->id = id; + list_add(&hdev->list, head); + + atomic_set(&hdev->refcnt, 1); + spin_lock_init(&hdev->lock); + + hdev->flags = 0; + hdev->pkt_type = (HCI_DM1 | HCI_DH1 | HCI_HV1); + hdev->link_mode = (HCI_LM_ACCEPT); + + tasklet_init(&hdev->cmd_task, hci_cmd_task,(unsigned long) hdev); + tasklet_init(&hdev->rx_task, hci_rx_task, (unsigned long) hdev); + tasklet_init(&hdev->tx_task, hci_tx_task, (unsigned long) hdev); + + skb_queue_head_init(&hdev->rx_q); + skb_queue_head_init(&hdev->cmd_q); + skb_queue_head_init(&hdev->raw_q); + + init_waitqueue_head(&hdev->req_wait_q); + init_MUTEX(&hdev->req_lock); + + inquiry_cache_init(hdev); + + hci_conn_hash_init(hdev); + + memset(&hdev->stat, 0, sizeof(struct hci_dev_stats)); + + atomic_set(&hdev->promisc, 0); + + write_unlock_bh(&hci_dev_list_lock); + + hci_register_sysfs(hdev); + + hci_notify(hdev, HCI_DEV_REG); + + return id; +} +EXPORT_SYMBOL(hci_register_dev); + +/* Unregister HCI device */ +int hci_unregister_dev(struct hci_dev *hdev) +{ + BT_DBG("%p name %s type %d", hdev, hdev->name, hdev->type); + + hci_unregister_sysfs(hdev); + + write_lock_bh(&hci_dev_list_lock); + list_del(&hdev->list); + write_unlock_bh(&hci_dev_list_lock); + + hci_dev_do_close(hdev); + + hci_notify(hdev, HCI_DEV_UNREG); + + __hci_dev_put(hdev); + return 0; +} +EXPORT_SYMBOL(hci_unregister_dev); + +/* Suspend HCI device */ +int hci_suspend_dev(struct hci_dev *hdev) +{ + hci_notify(hdev, HCI_DEV_SUSPEND); + return 0; +} +EXPORT_SYMBOL(hci_suspend_dev); + +/* Resume HCI device */ +int hci_resume_dev(struct hci_dev *hdev) +{ + hci_notify(hdev, HCI_DEV_RESUME); + return 0; +} +EXPORT_SYMBOL(hci_resume_dev); + +/* ---- Interface to upper protocols ---- */ + +/* Register/Unregister protocols. + * hci_task_lock is used to ensure that no tasks are running. */ +int hci_register_proto(struct hci_proto *hp) +{ + int err = 0; + + BT_DBG("%p name %s id %d", hp, hp->name, hp->id); + + if (hp->id >= HCI_MAX_PROTO) + return -EINVAL; + + write_lock_bh(&hci_task_lock); + + if (!hci_proto[hp->id]) + hci_proto[hp->id] = hp; + else + err = -EEXIST; + + write_unlock_bh(&hci_task_lock); + + return err; +} +EXPORT_SYMBOL(hci_register_proto); + +int hci_unregister_proto(struct hci_proto *hp) +{ + int err = 0; + + BT_DBG("%p name %s id %d", hp, hp->name, hp->id); + + if (hp->id >= HCI_MAX_PROTO) + return -EINVAL; + + write_lock_bh(&hci_task_lock); + + if (hci_proto[hp->id]) + hci_proto[hp->id] = NULL; + else + err = -ENOENT; + + write_unlock_bh(&hci_task_lock); + + return err; +} +EXPORT_SYMBOL(hci_unregister_proto); + +int hci_register_cb(struct hci_cb *cb) +{ + BT_DBG("%p name %s", cb, cb->name); + + write_lock_bh(&hci_cb_list_lock); + list_add(&cb->list, &hci_cb_list); + write_unlock_bh(&hci_cb_list_lock); + + return 0; +} +EXPORT_SYMBOL(hci_register_cb); + +int hci_unregister_cb(struct hci_cb *cb) +{ + BT_DBG("%p name %s", cb, cb->name); + + write_lock_bh(&hci_cb_list_lock); + list_del(&cb->list); + write_unlock_bh(&hci_cb_list_lock); + + return 0; +} +EXPORT_SYMBOL(hci_unregister_cb); + +static int hci_send_frame(struct sk_buff *skb) +{ + struct hci_dev *hdev = (struct hci_dev *) skb->dev; + + if (!hdev) { + kfree_skb(skb); + return -ENODEV; + } + + BT_DBG("%s type %d len %d", hdev->name, skb->pkt_type, skb->len); + + if (atomic_read(&hdev->promisc)) { + /* Time stamp */ + do_gettimeofday(&skb->stamp); + + hci_send_to_sock(hdev, skb); + } + + /* Get rid of skb owner, prior to sending to the driver. */ + skb_orphan(skb); + + return hdev->send(skb); +} + +/* Send HCI command */ +int hci_send_cmd(struct hci_dev *hdev, __u16 ogf, __u16 ocf, __u32 plen, void *param) +{ + int len = HCI_COMMAND_HDR_SIZE + plen; + struct hci_command_hdr *hdr; + struct sk_buff *skb; + + BT_DBG("%s ogf 0x%x ocf 0x%x plen %d", hdev->name, ogf, ocf, plen); + + skb = bt_skb_alloc(len, GFP_ATOMIC); + if (!skb) { + BT_ERR("%s Can't allocate memory for HCI command", hdev->name); + return -ENOMEM; + } + + hdr = (struct hci_command_hdr *) skb_put(skb, HCI_COMMAND_HDR_SIZE); + hdr->opcode = __cpu_to_le16(hci_opcode_pack(ogf, ocf)); + hdr->plen = plen; + + if (plen) + memcpy(skb_put(skb, plen), param, plen); + + BT_DBG("skb len %d", skb->len); + + skb->pkt_type = HCI_COMMAND_PKT; + skb->dev = (void *) hdev; + skb_queue_tail(&hdev->cmd_q, skb); + hci_sched_cmd(hdev); + + return 0; +} +EXPORT_SYMBOL(hci_send_cmd); + +/* Get data from the previously sent command */ +void *hci_sent_cmd_data(struct hci_dev *hdev, __u16 ogf, __u16 ocf) +{ + struct hci_command_hdr *hdr; + + if (!hdev->sent_cmd) + return NULL; + + hdr = (void *) hdev->sent_cmd->data; + + if (hdr->opcode != __cpu_to_le16(hci_opcode_pack(ogf, ocf))) + return NULL; + + BT_DBG("%s ogf 0x%x ocf 0x%x", hdev->name, ogf, ocf); + + return hdev->sent_cmd->data + HCI_COMMAND_HDR_SIZE; +} + +/* Send ACL data */ +static void hci_add_acl_hdr(struct sk_buff *skb, __u16 handle, __u16 flags) +{ + struct hci_acl_hdr *hdr; + int len = skb->len; + + hdr = (struct hci_acl_hdr *) skb_push(skb, HCI_ACL_HDR_SIZE); + hdr->handle = __cpu_to_le16(hci_handle_pack(handle, flags)); + hdr->dlen = __cpu_to_le16(len); + + skb->h.raw = (void *) hdr; +} + +int hci_send_acl(struct hci_conn *conn, struct sk_buff *skb, __u16 flags) +{ + struct hci_dev *hdev = conn->hdev; + struct sk_buff *list; + + BT_DBG("%s conn %p flags 0x%x", hdev->name, conn, flags); + + skb->dev = (void *) hdev; + skb->pkt_type = HCI_ACLDATA_PKT; + hci_add_acl_hdr(skb, conn->handle, flags | ACL_START); + + if (!(list = skb_shinfo(skb)->frag_list)) { + /* Non fragmented */ + BT_DBG("%s nonfrag skb %p len %d", hdev->name, skb, skb->len); + + skb_queue_tail(&conn->data_q, skb); + } else { + /* Fragmented */ + BT_DBG("%s frag %p len %d", hdev->name, skb, skb->len); + + skb_shinfo(skb)->frag_list = NULL; + + /* Queue all fragments atomically */ + spin_lock_bh(&conn->data_q.lock); + + __skb_queue_tail(&conn->data_q, skb); + do { + skb = list; list = list->next; + + skb->dev = (void *) hdev; + skb->pkt_type = HCI_ACLDATA_PKT; + hci_add_acl_hdr(skb, conn->handle, flags | ACL_CONT); + + BT_DBG("%s frag %p len %d", hdev->name, skb, skb->len); + + __skb_queue_tail(&conn->data_q, skb); + } while (list); + + spin_unlock_bh(&conn->data_q.lock); + } + + hci_sched_tx(hdev); + return 0; +} +EXPORT_SYMBOL(hci_send_acl); + +/* Send SCO data */ +int hci_send_sco(struct hci_conn *conn, struct sk_buff *skb) +{ + struct hci_dev *hdev = conn->hdev; + struct hci_sco_hdr hdr; + + BT_DBG("%s len %d", hdev->name, skb->len); + + if (skb->len > hdev->sco_mtu) { + kfree_skb(skb); + return -EINVAL; + } + + hdr.handle = __cpu_to_le16(conn->handle); + hdr.dlen = skb->len; + + skb->h.raw = skb_push(skb, HCI_SCO_HDR_SIZE); + memcpy(skb->h.raw, &hdr, HCI_SCO_HDR_SIZE); + + skb->dev = (void *) hdev; + skb->pkt_type = HCI_SCODATA_PKT; + skb_queue_tail(&conn->data_q, skb); + hci_sched_tx(hdev); + return 0; +} +EXPORT_SYMBOL(hci_send_sco); + +/* ---- HCI TX task (outgoing data) ---- */ + +/* HCI Connection scheduler */ +static inline struct hci_conn *hci_low_sent(struct hci_dev *hdev, __u8 type, int *quote) +{ + struct hci_conn_hash *h = &hdev->conn_hash; + struct hci_conn *conn = NULL; + int num = 0, min = ~0; + struct list_head *p; + + /* We don't have to lock device here. Connections are always + * added and removed with TX task disabled. */ + list_for_each(p, &h->list) { + struct hci_conn *c; + c = list_entry(p, struct hci_conn, list); + + if (c->type != type || c->state != BT_CONNECTED + || skb_queue_empty(&c->data_q)) + continue; + num++; + + if (c->sent < min) { + min = c->sent; + conn = c; + } + } + + if (conn) { + int cnt = (type == ACL_LINK ? hdev->acl_cnt : hdev->sco_cnt); + int q = cnt / num; + *quote = q ? q : 1; + } else + *quote = 0; + + BT_DBG("conn %p quote %d", conn, *quote); + return conn; +} + +static inline void hci_acl_tx_to(struct hci_dev *hdev) +{ + struct hci_conn_hash *h = &hdev->conn_hash; + struct list_head *p; + struct hci_conn *c; + + BT_ERR("%s ACL tx timeout", hdev->name); + + /* Kill stalled connections */ + list_for_each(p, &h->list) { + c = list_entry(p, struct hci_conn, list); + if (c->type == ACL_LINK && c->sent) { + BT_ERR("%s killing stalled ACL connection %s", + hdev->name, batostr(&c->dst)); + hci_acl_disconn(c, 0x13); + } + } +} + +static inline void hci_sched_acl(struct hci_dev *hdev) +{ + struct hci_conn *conn; + struct sk_buff *skb; + int quote; + + BT_DBG("%s", hdev->name); + + if (!test_bit(HCI_RAW, &hdev->flags)) { + /* ACL tx timeout must be longer than maximum + * link supervision timeout (40.9 seconds) */ + if (!hdev->acl_cnt && (jiffies - hdev->acl_last_tx) > (HZ * 45)) + hci_acl_tx_to(hdev); + } + + while (hdev->acl_cnt && (conn = hci_low_sent(hdev, ACL_LINK, "e))) { + while (quote-- && (skb = skb_dequeue(&conn->data_q))) { + BT_DBG("skb %p len %d", skb, skb->len); + hci_send_frame(skb); + hdev->acl_last_tx = jiffies; + + hdev->acl_cnt--; + conn->sent++; + } + } +} + +/* Schedule SCO */ +static inline void hci_sched_sco(struct hci_dev *hdev) +{ + struct hci_conn *conn; + struct sk_buff *skb; + int quote; + + BT_DBG("%s", hdev->name); + + while (hdev->sco_cnt && (conn = hci_low_sent(hdev, SCO_LINK, "e))) { + while (quote-- && (skb = skb_dequeue(&conn->data_q))) { + BT_DBG("skb %p len %d", skb, skb->len); + hci_send_frame(skb); + + conn->sent++; + if (conn->sent == ~0) + conn->sent = 0; + } + } +} + +static void hci_tx_task(unsigned long arg) +{ + struct hci_dev *hdev = (struct hci_dev *) arg; + struct sk_buff *skb; + + read_lock(&hci_task_lock); + + BT_DBG("%s acl %d sco %d", hdev->name, hdev->acl_cnt, hdev->sco_cnt); + + /* Schedule queues and send stuff to HCI driver */ + + hci_sched_acl(hdev); + + hci_sched_sco(hdev); + + /* Send next queued raw (unknown type) packet */ + while ((skb = skb_dequeue(&hdev->raw_q))) + hci_send_frame(skb); + + read_unlock(&hci_task_lock); +} + +/* ----- HCI RX task (incoming data proccessing) ----- */ + +/* ACL data packet */ +static inline void hci_acldata_packet(struct hci_dev *hdev, struct sk_buff *skb) +{ + struct hci_acl_hdr *hdr = (void *) skb->data; + struct hci_conn *conn; + __u16 handle, flags; + + skb_pull(skb, HCI_ACL_HDR_SIZE); + + handle = __le16_to_cpu(hdr->handle); + flags = hci_flags(handle); + handle = hci_handle(handle); + + BT_DBG("%s len %d handle 0x%x flags 0x%x", hdev->name, skb->len, handle, flags); + + hdev->stat.acl_rx++; + + hci_dev_lock(hdev); + conn = hci_conn_hash_lookup_handle(hdev, handle); + hci_dev_unlock(hdev); + + if (conn) { + register struct hci_proto *hp; + + /* Send to upper protocol */ + if ((hp = hci_proto[HCI_PROTO_L2CAP]) && hp->recv_acldata) { + hp->recv_acldata(conn, skb, flags); + return; + } + } else { + BT_ERR("%s ACL packet for unknown connection handle %d", + hdev->name, handle); + } + + kfree_skb(skb); +} + +/* SCO data packet */ +static inline void hci_scodata_packet(struct hci_dev *hdev, struct sk_buff *skb) +{ + struct hci_sco_hdr *hdr = (void *) skb->data; + struct hci_conn *conn; + __u16 handle; + + skb_pull(skb, HCI_SCO_HDR_SIZE); + + handle = __le16_to_cpu(hdr->handle); + + BT_DBG("%s len %d handle 0x%x", hdev->name, skb->len, handle); + + hdev->stat.sco_rx++; + + hci_dev_lock(hdev); + conn = hci_conn_hash_lookup_handle(hdev, handle); + hci_dev_unlock(hdev); + + if (conn) { + register struct hci_proto *hp; + + /* Send to upper protocol */ + if ((hp = hci_proto[HCI_PROTO_SCO]) && hp->recv_scodata) { + hp->recv_scodata(conn, skb); + return; + } + } else { + BT_ERR("%s SCO packet for unknown connection handle %d", + hdev->name, handle); + } + + kfree_skb(skb); +} + +void hci_rx_task(unsigned long arg) +{ + struct hci_dev *hdev = (struct hci_dev *) arg; + struct sk_buff *skb; + + BT_DBG("%s", hdev->name); + + read_lock(&hci_task_lock); + + while ((skb = skb_dequeue(&hdev->rx_q))) { + if (atomic_read(&hdev->promisc)) { + /* Send copy to the sockets */ + hci_send_to_sock(hdev, skb); + } + + if (test_bit(HCI_RAW, &hdev->flags)) { + kfree_skb(skb); + continue; + } + + if (test_bit(HCI_INIT, &hdev->flags)) { + /* Don't process data packets in this states. */ + switch (skb->pkt_type) { + case HCI_ACLDATA_PKT: + case HCI_SCODATA_PKT: + kfree_skb(skb); + continue; + }; + } + + /* Process frame */ + switch (skb->pkt_type) { + case HCI_EVENT_PKT: + hci_event_packet(hdev, skb); + break; + + case HCI_ACLDATA_PKT: + BT_DBG("%s ACL data packet", hdev->name); + hci_acldata_packet(hdev, skb); + break; + + case HCI_SCODATA_PKT: + BT_DBG("%s SCO data packet", hdev->name); + hci_scodata_packet(hdev, skb); + break; + + default: + kfree_skb(skb); + break; + } + } + + read_unlock(&hci_task_lock); +} + +static void hci_cmd_task(unsigned long arg) +{ + struct hci_dev *hdev = (struct hci_dev *) arg; + struct sk_buff *skb; + + BT_DBG("%s cmd %d", hdev->name, atomic_read(&hdev->cmd_cnt)); + + if (!atomic_read(&hdev->cmd_cnt) && (jiffies - hdev->cmd_last_tx) > HZ) { + BT_ERR("%s command tx timeout", hdev->name); + atomic_set(&hdev->cmd_cnt, 1); + } + + /* Send queued commands */ + if (atomic_read(&hdev->cmd_cnt) && (skb = skb_dequeue(&hdev->cmd_q))) { + if (hdev->sent_cmd) + kfree_skb(hdev->sent_cmd); + + if ((hdev->sent_cmd = skb_clone(skb, GFP_ATOMIC))) { + atomic_dec(&hdev->cmd_cnt); + hci_send_frame(skb); + hdev->cmd_last_tx = jiffies; + } else { + skb_queue_head(&hdev->cmd_q, skb); + hci_sched_cmd(hdev); + } + } +} |
