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[Bluetooth] Add automatic sniff mode support
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This patch introduces the automatic sniff mode feature. This allows
the host to switch idle connections into sniff mode to safe power.

Signed-off-by: Ulisses Furquim <ulissesf@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
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holtmann authored and David S. Miller committed Jul 4, 2006
1 parent da1f519 commit 04837f6
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Showing 7 changed files with 454 additions and 86 deletions.
70 changes: 56 additions & 14 deletions include/net/bluetooth/hci.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -101,9 +101,10 @@ enum {
#define HCIINQUIRY _IOR('H', 240, int)

/* HCI timeouts */
#define HCI_CONN_TIMEOUT (HZ * 40)
#define HCI_DISCONN_TIMEOUT (HZ * 2)
#define HCI_CONN_IDLE_TIMEOUT (HZ * 60)
#define HCI_CONNECT_TIMEOUT (40000) /* 40 seconds */
#define HCI_DISCONN_TIMEOUT (2000) /* 2 seconds */
#define HCI_IDLE_TIMEOUT (6000) /* 6 seconds */
#define HCI_INIT_TIMEOUT (10000) /* 10 seconds */

/* HCI Packet types */
#define HCI_COMMAND_PKT 0x01
Expand Down Expand Up @@ -145,7 +146,7 @@ enum {
#define LMP_TACCURACY 0x10
#define LMP_RSWITCH 0x20
#define LMP_HOLD 0x40
#define LMP_SNIF 0x80
#define LMP_SNIFF 0x80

#define LMP_PARK 0x01
#define LMP_RSSI 0x02
Expand All @@ -160,13 +161,21 @@ enum {
#define LMP_PSCHEME 0x02
#define LMP_PCONTROL 0x04

#define LMP_SNIFF_SUBR 0x02

/* Connection modes */
#define HCI_CM_ACTIVE 0x0000
#define HCI_CM_HOLD 0x0001
#define HCI_CM_SNIFF 0x0002
#define HCI_CM_PARK 0x0003

/* Link policies */
#define HCI_LP_RSWITCH 0x0001
#define HCI_LP_HOLD 0x0002
#define HCI_LP_SNIFF 0x0004
#define HCI_LP_PARK 0x0008

/* Link mode */
/* Link modes */
#define HCI_LM_ACCEPT 0x8000
#define HCI_LM_MASTER 0x0001
#define HCI_LM_AUTH 0x0002
Expand All @@ -192,7 +201,7 @@ struct hci_rp_read_loc_version {
} __attribute__ ((packed));

#define OCF_READ_LOCAL_FEATURES 0x0003
struct hci_rp_read_loc_features {
struct hci_rp_read_local_features {
__u8 status;
__u8 features[8];
} __attribute__ ((packed));
Expand Down Expand Up @@ -376,17 +385,32 @@ struct hci_cp_change_conn_link_key {
} __attribute__ ((packed));

#define OCF_READ_REMOTE_FEATURES 0x001B
struct hci_cp_read_rmt_features {
struct hci_cp_read_remote_features {
__le16 handle;
} __attribute__ ((packed));

#define OCF_READ_REMOTE_VERSION 0x001D
struct hci_cp_read_rmt_version {
struct hci_cp_read_remote_version {
__le16 handle;
} __attribute__ ((packed));

/* Link Policy */
#define OGF_LINK_POLICY 0x02
#define OGF_LINK_POLICY 0x02

#define OCF_SNIFF_MODE 0x0003
struct hci_cp_sniff_mode {
__le16 handle;
__le16 max_interval;
__le16 min_interval;
__le16 attempt;
__le16 timeout;
} __attribute__ ((packed));

#define OCF_EXIT_SNIFF_MODE 0x0004
struct hci_cp_exit_sniff_mode {
__le16 handle;
} __attribute__ ((packed));

#define OCF_ROLE_DISCOVERY 0x0009
struct hci_cp_role_discovery {
__le16 handle;
Expand All @@ -407,7 +431,7 @@ struct hci_rp_read_link_policy {
__le16 policy;
} __attribute__ ((packed));

#define OCF_SWITCH_ROLE 0x000B
#define OCF_SWITCH_ROLE 0x000B
struct hci_cp_switch_role {
bdaddr_t bdaddr;
__u8 role;
Expand All @@ -423,6 +447,14 @@ struct hci_rp_write_link_policy {
__le16 handle;
} __attribute__ ((packed));

#define OCF_SNIFF_SUBRATE 0x0011
struct hci_cp_sniff_subrate {
__le16 handle;
__le16 max_latency;
__le16 min_remote_timeout;
__le16 min_local_timeout;
} __attribute__ ((packed));

/* Status params */
#define OGF_STATUS_PARAM 0x05

Expand Down Expand Up @@ -582,15 +614,15 @@ struct hci_ev_link_key_notify {
__u8 key_type;
} __attribute__ ((packed));

#define HCI_EV_RMT_FEATURES 0x0B
struct hci_ev_rmt_features {
#define HCI_EV_REMOTE_FEATURES 0x0B
struct hci_ev_remote_features {
__u8 status;
__le16 handle;
__u8 features[8];
} __attribute__ ((packed));

#define HCI_EV_RMT_VERSION 0x0C
struct hci_ev_rmt_version {
#define HCI_EV_REMOTE_VERSION 0x0C
struct hci_ev_remote_version {
__u8 status;
__le16 handle;
__u8 lmp_ver;
Expand All @@ -611,6 +643,16 @@ struct hci_ev_pscan_rep_mode {
__u8 pscan_rep_mode;
} __attribute__ ((packed));

#define HCI_EV_SNIFF_SUBRATE 0x2E
struct hci_ev_sniff_subrate {
__u8 status;
__le16 handle;
__le16 max_tx_latency;
__le16 max_rx_latency;
__le16 max_remote_timeout;
__le16 max_local_timeout;
} __attribute__ ((packed));

/* Internal events generated by Bluetooth stack */
#define HCI_EV_STACK_INTERNAL 0xFD
struct hci_ev_stack_internal {
Expand Down
54 changes: 30 additions & 24 deletions include/net/bluetooth/hci_core.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -31,10 +31,7 @@
#define HCI_PROTO_L2CAP 0
#define HCI_PROTO_SCO 1

#define HCI_INIT_TIMEOUT (HZ * 10)

/* HCI Core structures */

struct inquiry_data {
bdaddr_t bdaddr;
__u8 pscan_rep_mode;
Expand Down Expand Up @@ -81,6 +78,10 @@ struct hci_dev {
__u16 link_policy;
__u16 link_mode;

__u32 idle_timeout;
__u16 sniff_min_interval;
__u16 sniff_max_interval;

unsigned long quirks;

atomic_t cmd_cnt;
Expand Down Expand Up @@ -145,18 +146,24 @@ struct hci_conn {
bdaddr_t dst;
__u16 handle;
__u16 state;
__u8 mode;
__u8 type;
__u8 out;
__u8 dev_class[3];
__u8 features[8];
__u16 interval;
__u16 link_policy;
__u32 link_mode;
__u8 power_save;
unsigned long pend;

unsigned int sent;

struct sk_buff_head data_q;

struct timer_list timer;

struct timer_list disc_timer;
struct timer_list idle_timer;

struct hci_dev *hdev;
void *l2cap_data;
void *sco_data;
Expand Down Expand Up @@ -211,7 +218,8 @@ void hci_inquiry_cache_update(struct hci_dev *hdev, struct inquiry_data *data);
enum {
HCI_CONN_AUTH_PEND,
HCI_CONN_ENCRYPT_PEND,
HCI_CONN_RSWITCH_PEND
HCI_CONN_RSWITCH_PEND,
HCI_CONN_MODE_CHANGE_PEND,
};

static inline void hci_conn_hash_init(struct hci_dev *hdev)
Expand Down Expand Up @@ -286,31 +294,27 @@ int hci_conn_encrypt(struct hci_conn *conn);
int hci_conn_change_link_key(struct hci_conn *conn);
int hci_conn_switch_role(struct hci_conn *conn, uint8_t role);

static inline void hci_conn_set_timer(struct hci_conn *conn, unsigned long timeout)
{
mod_timer(&conn->timer, jiffies + timeout);
}

static inline void hci_conn_del_timer(struct hci_conn *conn)
{
del_timer(&conn->timer);
}
void hci_conn_enter_active_mode(struct hci_conn *conn);
void hci_conn_enter_sniff_mode(struct hci_conn *conn);

static inline void hci_conn_hold(struct hci_conn *conn)
{
atomic_inc(&conn->refcnt);
hci_conn_del_timer(conn);
del_timer(&conn->disc_timer);
}

static inline void hci_conn_put(struct hci_conn *conn)
{
if (atomic_dec_and_test(&conn->refcnt)) {
unsigned long timeo;
if (conn->type == ACL_LINK) {
unsigned long timeo = (conn->out) ?
HCI_DISCONN_TIMEOUT : HCI_DISCONN_TIMEOUT * 2;
hci_conn_set_timer(conn, timeo);
timeo = msecs_to_jiffies(HCI_DISCONN_TIMEOUT);
if (!conn->out)
timeo *= 2;
del_timer(&conn->idle_timer);
} else
hci_conn_set_timer(conn, HZ / 100);
timeo = msecs_to_jiffies(10);
mod_timer(&conn->disc_timer, jiffies + timeo);
}
}

Expand Down Expand Up @@ -411,8 +415,10 @@ void hci_unregister_sysfs(struct hci_dev *hdev);
#define SET_HCIDEV_DEV(hdev, pdev) ((hdev)->class_dev.dev = (pdev))

/* ----- LMP capabilities ----- */
#define lmp_rswitch_capable(dev) (dev->features[0] & LMP_RSWITCH)
#define lmp_encrypt_capable(dev) (dev->features[0] & LMP_ENCRYPT)
#define lmp_rswitch_capable(dev) ((dev)->features[0] & LMP_RSWITCH)
#define lmp_encrypt_capable(dev) ((dev)->features[0] & LMP_ENCRYPT)
#define lmp_sniff_capable(dev) ((dev)->features[0] & LMP_SNIFF)
#define lmp_sniffsubr_capable(dev) ((dev)->features[5] & LMP_SNIFF_SUBR)

/* ----- HCI protocols ----- */
struct hci_proto {
Expand Down
2 changes: 1 addition & 1 deletion net/bluetooth/af_bluetooth.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -48,7 +48,7 @@
#define BT_DBG(D...)
#endif

#define VERSION "2.8"
#define VERSION "2.9"

/* Bluetooth sockets */
#define BT_MAX_PROTO 8
Expand Down
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