hci_core.c

/*
   BlueZ - Bluetooth protocol stack for Linux
   Copyright (C) 2000-2001 Qualcomm Incorporated
   Copyright (C) 2011 ProFUSION Embedded Systems

   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/export.h>
#include <linux/rfkill.h>
#include <linux/debugfs.h>
#include <linux/crypto.h>
#include <linux/property.h>
#include <linux/suspend.h>
#include <linux/wait.h>
#include <asm/unaligned.h>

#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#include <net/bluetooth/l2cap.h>
#include <net/bluetooth/mgmt.h>

#include "hci_request.h"
#include "hci_debugfs.h"
#include "smp.h"
#include "leds.h"
#include "msft.h"
#include "aosp.h"

static void hci_rx_work(struct work_struct *work);
static void hci_cmd_work(struct work_struct *work);
static void hci_tx_work(struct work_struct *work);

/* HCI device list */
LIST_HEAD(hci_dev_list);
DEFINE_RWLOCK(hci_dev_list_lock);

/* HCI callback list */
LIST_HEAD(hci_cb_list);
DEFINE_MUTEX(hci_cb_list_lock);

/* HCI ID Numbering */
static DEFINE_IDA(hci_index_ida);

/* ---- HCI debugfs entries ---- */

static ssize_t dut_mode_read(struct file *file, char __user *user_buf,
			     size_t count, loff_t *ppos)
{
	struct hci_dev *hdev = file->private_data;
	char buf[3];

	buf[0] = hci_dev_test_flag(hdev, HCI_DUT_MODE) ? 'Y' : 'N';
	buf[1] = '\n';
	buf[2] = '\0';
	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
}

static ssize_t dut_mode_write(struct file *file, const char __user *user_buf,
			      size_t count, loff_t *ppos)
{
	struct hci_dev *hdev = file->private_data;
	struct sk_buff *skb;
	bool enable;
	int err;

	if (!test_bit(HCI_UP, &hdev->flags))
		return -ENETDOWN;

	err = kstrtobool_from_user(user_buf, count, &enable);
	if (err)
		return err;

	if (enable == hci_dev_test_flag(hdev, HCI_DUT_MODE))
		return -EALREADY;

	hci_req_sync_lock(hdev);
	if (enable)
		skb = __hci_cmd_sync(hdev, HCI_OP_ENABLE_DUT_MODE, 0, NULL,
				     HCI_CMD_TIMEOUT);
	else
		skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL,
				     HCI_CMD_TIMEOUT);
	hci_req_sync_unlock(hdev);

	if (IS_ERR(skb))
		return PTR_ERR(skb);

	kfree_skb(skb);

	hci_dev_change_flag(hdev, HCI_DUT_MODE);

	return count;
}

static const struct file_operations dut_mode_fops = {
	.open		= simple_open,
	.read		= dut_mode_read,
	.write		= dut_mode_write,
	.llseek		= default_llseek,
};

static ssize_t vendor_diag_read(struct file *file, char __user *user_buf,
				size_t count, loff_t *ppos)
{
	struct hci_dev *hdev = file->private_data;
	char buf[3];

	buf[0] = hci_dev_test_flag(hdev, HCI_VENDOR_DIAG) ? 'Y' : 'N';
	buf[1] = '\n';
	buf[2] = '\0';
	return simple_read_from_buffer(user_buf, count, ppos, buf, 2);
}

static ssize_t vendor_diag_write(struct file *file, const char __user *user_buf,
				 size_t count, loff_t *ppos)
{
	struct hci_dev *hdev = file->private_data;
	bool enable;
	int err;

	err = kstrtobool_from_user(user_buf, count, &enable);
	if (err)
		return err;

	/* When the diagnostic flags are not persistent and the transport
	 * is not active or in user channel operation, then there is no need
	 * for the vendor callback. Instead just store the desired value and
	 * the setting will be programmed when the controller gets powered on.
	 */
	if (test_bit(HCI_QUIRK_NON_PERSISTENT_DIAG, &hdev->quirks) &&
	    (!test_bit(HCI_RUNNING, &hdev->flags) ||
	     hci_dev_test_flag(hdev, HCI_USER_CHANNEL)))
		goto done;

	hci_req_sync_lock(hdev);
	err = hdev->set_diag(hdev, enable);
	hci_req_sync_unlock(hdev);

	if (err < 0)
		return err;

done:
	if (enable)
		hci_dev_set_flag(hdev, HCI_VENDOR_DIAG);
	else
		hci_dev_clear_flag(hdev, HCI_VENDOR_DIAG);

	return count;
}

static const struct file_operations vendor_diag_fops = {
	.open		= simple_open,
	.read		= vendor_diag_read,
	.write		= vendor_diag_write,
	.llseek		= default_llseek,
};

static void hci_debugfs_create_basic(struct hci_dev *hdev)
{
	debugfs_create_file("dut_mode", 0644, hdev->debugfs, hdev,
			    &dut_mode_fops);

	if (hdev->set_diag)
		debugfs_create_file("vendor_diag", 0644, hdev->debugfs, hdev,
				    &vendor_diag_fops);
}

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

	/* Reset device */
	set_bit(HCI_RESET, &req->hdev->flags);
	hci_req_add(req, HCI_OP_RESET, 0, NULL);
	return 0;
}

static void bredr_init(struct hci_request *req)
{
	req->hdev->flow_ctl_mode = HCI_FLOW_CTL_MODE_PACKET_BASED;

	/* Read Local Supported Features */
	hci_req_add(req, HCI_OP_READ_LOCAL_FEATURES, 0, NULL);

	/* Read Local Version */
	hci_req_add(req, HCI_OP_READ_LOCAL_VERSION, 0, NULL);

	/* Read BD Address */
	hci_req_add(req, HCI_OP_READ_BD_ADDR, 0, NULL);
}

static void amp_init1(struct hci_request *req)
{
	req->hdev->flow_ctl_mode = HCI_FLOW_CTL_MODE_BLOCK_BASED;

	/* Read Local Version */
	hci_req_add(req, HCI_OP_READ_LOCAL_VERSION, 0, NULL);

	/* Read Local Supported Commands */
	hci_req_add(req, HCI_OP_READ_LOCAL_COMMANDS, 0, NULL);

	/* Read Local AMP Info */
	hci_req_add(req, HCI_OP_READ_LOCAL_AMP_INFO, 0, NULL);

	/* Read Data Blk size */
	hci_req_add(req, HCI_OP_READ_DATA_BLOCK_SIZE, 0, NULL);

	/* Read Flow Control Mode */
	hci_req_add(req, HCI_OP_READ_FLOW_CONTROL_MODE, 0, NULL);

	/* Read Location Data */
	hci_req_add(req, HCI_OP_READ_LOCATION_DATA, 0, NULL);
}

static int amp_init2(struct hci_request *req)
{
	/* Read Local Supported Features. Not all AMP controllers
	 * support this so it's placed conditionally in the second
	 * stage init.
	 */
	if (req->hdev->commands[14] & 0x20)
		hci_req_add(req, HCI_OP_READ_LOCAL_FEATURES, 0, NULL);

	return 0;
}

static int hci_init1_req(struct hci_request *req, unsigned long opt)
{
	struct hci_dev *hdev = req->hdev;

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

	/* Reset */
	if (!test_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks))
		hci_reset_req(req, 0);

	switch (hdev->dev_type) {
	case HCI_PRIMARY:
		bredr_init(req);
		break;
	case HCI_AMP:
		amp_init1(req);
		break;
	default:
		bt_dev_err(hdev, "Unknown device type %d", hdev->dev_type);
		break;
	}

	return 0;
}

static void bredr_setup(struct hci_request *req)
{
	__le16 param;
	__u8 flt_type;

	/* Read Buffer Size (ACL mtu, max pkt, etc.) */
	hci_req_add(req, HCI_OP_READ_BUFFER_SIZE, 0, NULL);

	/* Read Class of Device */
	hci_req_add(req, HCI_OP_READ_CLASS_OF_DEV, 0, NULL);

	/* Read Local Name */
	hci_req_add(req, HCI_OP_READ_LOCAL_NAME, 0, NULL);

	/* Read Voice Setting */
	hci_req_add(req, HCI_OP_READ_VOICE_SETTING, 0, NULL);

	/* Read Number of Supported IAC */
	hci_req_add(req, HCI_OP_READ_NUM_SUPPORTED_IAC, 0, NULL);

	/* Read Current IAC LAP */
	hci_req_add(req, HCI_OP_READ_CURRENT_IAC_LAP, 0, NULL);

	/* Clear Event Filters */
	flt_type = HCI_FLT_CLEAR_ALL;
	hci_req_add(req, HCI_OP_SET_EVENT_FLT, 1, &flt_type);

	/* Connection accept timeout ~20 secs */
	param = cpu_to_le16(0x7d00);
	hci_req_add(req, HCI_OP_WRITE_CA_TIMEOUT, 2, &param);
}

static void le_setup(struct hci_request *req)
{
	struct hci_dev *hdev = req->hdev;

	/* Read LE Buffer Size */
	hci_req_add(req, HCI_OP_LE_READ_BUFFER_SIZE, 0, NULL);

	/* Read LE Local Supported Features */
	hci_req_add(req, HCI_OP_LE_READ_LOCAL_FEATURES, 0, NULL);

	/* Read LE Supported States */
	hci_req_add(req, HCI_OP_LE_READ_SUPPORTED_STATES, 0, NULL);

	/* LE-only controllers have LE implicitly enabled */
	if (!lmp_bredr_capable(hdev))
		hci_dev_set_flag(hdev, HCI_LE_ENABLED);
}

static void hci_setup_event_mask(struct hci_request *req)
{
	struct hci_dev *hdev = req->hdev;

	/* The second byte is 0xff instead of 0x9f (two reserved bits
	 * disabled) since a Broadcom 1.2 dongle doesn't respond to the
	 * command otherwise.
	 */
	u8 events[8] = { 0xff, 0xff, 0xfb, 0xff, 0x00, 0x00, 0x00, 0x00 };

	/* CSR 1.1 dongles does not accept any bitfield so don't try to set
	 * any event mask for pre 1.2 devices.
	 */
	if (hdev->hci_ver < BLUETOOTH_VER_1_2)
		return;

	if (lmp_bredr_capable(hdev)) {
		events[4] |= 0x01; /* Flow Specification Complete */
	} else {
		/* Use a different default for LE-only devices */
		memset(events, 0, sizeof(events));
		events[1] |= 0x20; /* Command Complete */
		events[1] |= 0x40; /* Command Status */
		events[1] |= 0x80; /* Hardware Error */

		/* If the controller supports the Disconnect command, enable
		 * the corresponding event. In addition enable packet flow
		 * control related events.
		 */
		if (hdev->commands[0] & 0x20) {
			events[0] |= 0x10; /* Disconnection Complete */
			events[2] |= 0x04; /* Number of Completed Packets */
			events[3] |= 0x02; /* Data Buffer Overflow */
		}

		/* If the controller supports the Read Remote Version
		 * Information command, enable the corresponding event.
		 */
		if (hdev->commands[2] & 0x80)
			events[1] |= 0x08; /* Read Remote Version Information
					    * Complete
					    */

		if (hdev->le_features[0] & HCI_LE_ENCRYPTION) {
			events[0] |= 0x80; /* Encryption Change */
			events[5] |= 0x80; /* Encryption Key Refresh Complete */
		}
	}

	if (lmp_inq_rssi_capable(hdev) ||
	    test_bit(HCI_QUIRK_FIXUP_INQUIRY_MODE, &hdev->quirks))
		events[4] |= 0x02; /* Inquiry Result with RSSI */

	if (lmp_ext_feat_capable(hdev))
		events[4] |= 0x04; /* Read Remote Extended Features Complete */

	if (lmp_esco_capable(hdev)) {
		events[5] |= 0x08; /* Synchronous Connection Complete */
		events[5] |= 0x10; /* Synchronous Connection Changed */
	}

	if (lmp_sniffsubr_capable(hdev))
		events[5] |= 0x20; /* Sniff Subrating */

	if (lmp_pause_enc_capable(hdev))
		events[5] |= 0x80; /* Encryption Key Refresh Complete */

	if (lmp_ext_inq_capable(hdev))
		events[5] |= 0x40; /* Extended Inquiry Result */

	if (lmp_no_flush_capable(hdev))
		events[7] |= 0x01; /* Enhanced Flush Complete */

	if (lmp_lsto_capable(hdev))
		events[6] |= 0x80; /* Link Supervision Timeout Changed */

	if (lmp_ssp_capable(hdev)) {
		events[6] |= 0x01;	/* IO Capability Request */
		events[6] |= 0x02;	/* IO Capability Response */
		events[6] |= 0x04;	/* User Confirmation Request */
		events[6] |= 0x08;	/* User Passkey Request */
		events[6] |= 0x10;	/* Remote OOB Data Request */
		events[6] |= 0x20;	/* Simple Pairing Complete */
		events[7] |= 0x04;	/* User Passkey Notification */
		events[7] |= 0x08;	/* Keypress Notification */
		events[7] |= 0x10;	/* Remote Host Supported
					 * Features Notification
					 */
	}

	if (lmp_le_capable(hdev))
		events[7] |= 0x20;	/* LE Meta-Event */

	hci_req_add(req, HCI_OP_SET_EVENT_MASK, sizeof(events), events);
}

static int hci_init2_req(struct hci_request *req, unsigned long opt)
{
	struct hci_dev *hdev = req->hdev;

	if (hdev->dev_type == HCI_AMP)
		return amp_init2(req);

	if (lmp_bredr_capable(hdev))
		bredr_setup(req);
	else
		hci_dev_clear_flag(hdev, HCI_BREDR_ENABLED);

	if (lmp_le_capable(hdev))
		le_setup(req);

	/* All Bluetooth 1.2 and later controllers should support the
	 * HCI command for reading the local supported commands.
	 *
	 * Unfortunately some controllers indicate Bluetooth 1.2 support,
	 * but do not have support for this command. If that is the case,
	 * the driver can quirk the behavior and skip reading the local
	 * supported commands.
	 */
	if (hdev->hci_ver > BLUETOOTH_VER_1_1 &&
	    !test_bit(HCI_QUIRK_BROKEN_LOCAL_COMMANDS, &hdev->quirks))
		hci_req_add(req, HCI_OP_READ_LOCAL_COMMANDS, 0, NULL);

	if (lmp_ssp_capable(hdev)) {
		/* When SSP is available, then the host features page
		 * should also be available as well. However some
		 * controllers list the max_page as 0 as long as SSP
		 * has not been enabled. To achieve proper debugging
		 * output, force the minimum max_page to 1 at least.
		 */
		hdev->max_page = 0x01;

		if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED)) {
			u8 mode = 0x01;

			hci_req_add(req, HCI_OP_WRITE_SSP_MODE,
				    sizeof(mode), &mode);
		} else {
			struct hci_cp_write_eir cp;

			memset(hdev->eir, 0, sizeof(hdev->eir));
			memset(&cp, 0, sizeof(cp));

			hci_req_add(req, HCI_OP_WRITE_EIR, sizeof(cp), &cp);
		}
	}

	if (lmp_inq_rssi_capable(hdev) ||
	    test_bit(HCI_QUIRK_FIXUP_INQUIRY_MODE, &hdev->quirks)) {
		u8 mode;

		/* If Extended Inquiry Result events are supported, then
		 * they are clearly preferred over Inquiry Result with RSSI
		 * events.
		 */
		mode = lmp_ext_inq_capable(hdev) ? 0x02 : 0x01;

		hci_req_add(req, HCI_OP_WRITE_INQUIRY_MODE, 1, &mode);
	}

	if (lmp_inq_tx_pwr_capable(hdev))
		hci_req_add(req, HCI_OP_READ_INQ_RSP_TX_POWER, 0, NULL);

	if (lmp_ext_feat_capable(hdev)) {
		struct hci_cp_read_local_ext_features cp;

		cp.page = 0x01;
		hci_req_add(req, HCI_OP_READ_LOCAL_EXT_FEATURES,
			    sizeof(cp), &cp);
	}

	if (hci_dev_test_flag(hdev, HCI_LINK_SECURITY)) {
		u8 enable = 1;
		hci_req_add(req, HCI_OP_WRITE_AUTH_ENABLE, sizeof(enable),
			    &enable);
	}

	return 0;
}

static void hci_setup_link_policy(struct hci_request *req)
{
	struct hci_dev *hdev = req->hdev;
	struct hci_cp_write_def_link_policy cp;
	u16 link_policy = 0;

	if (lmp_rswitch_capable(hdev))
		link_policy |= HCI_LP_RSWITCH;
	if (lmp_hold_capable(hdev))
		link_policy |= HCI_LP_HOLD;
	if (lmp_sniff_capable(hdev))
		link_policy |= HCI_LP_SNIFF;
	if (lmp_park_capable(hdev))
		link_policy |= HCI_LP_PARK;

	cp.policy = cpu_to_le16(link_policy);
	hci_req_add(req, HCI_OP_WRITE_DEF_LINK_POLICY, sizeof(cp), &cp);
}

static void hci_set_le_support(struct hci_request *req)
{
	struct hci_dev *hdev = req->hdev;
	struct hci_cp_write_le_host_supported cp;

	/* LE-only devices do not support explicit enablement */
	if (!lmp_bredr_capable(hdev))
		return;

	memset(&cp, 0, sizeof(cp));

	if (hci_dev_test_flag(hdev, HCI_LE_ENABLED)) {
		cp.le = 0x01;
		cp.simul = 0x00;
	}

	if (cp.le != lmp_host_le_capable(hdev))
		hci_req_add(req, HCI_OP_WRITE_LE_HOST_SUPPORTED, sizeof(cp),
			    &cp);
}

static void hci_set_event_mask_page_2(struct hci_request *req)
{
	struct hci_dev *hdev = req->hdev;
	u8 events[8] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
	bool changed = false;

	/* If Connectionless Slave Broadcast master role is supported
	 * enable all necessary events for it.
	 */
	if (lmp_csb_master_capable(hdev)) {
		events[1] |= 0x40;	/* Triggered Clock Capture */
		events[1] |= 0x80;	/* Synchronization Train Complete */
		events[2] |= 0x10;	/* Slave Page Response Timeout */
		events[2] |= 0x20;	/* CSB Channel Map Change */
		changed = true;
	}

	/* If Connectionless Slave Broadcast slave role is supported
	 * enable all necessary events for it.
	 */
	if (lmp_csb_slave_capable(hdev)) {
		events[2] |= 0x01;	/* Synchronization Train Received */
		events[2] |= 0x02;	/* CSB Receive */
		events[2] |= 0x04;	/* CSB Timeout */
		events[2] |= 0x08;	/* Truncated Page Complete */
		changed = true;
	}

	/* Enable Authenticated Payload Timeout Expired event if supported */
	if (lmp_ping_capable(hdev) || hdev->le_features[0] & HCI_LE_PING) {
		events[2] |= 0x80;
		changed = true;
	}

	/* Some Broadcom based controllers indicate support for Set Event
	 * Mask Page 2 command, but then actually do not support it. Since
	 * the default value is all bits set to zero, the command is only
	 * required if the event mask has to be changed. In case no change
	 * to the event mask is needed, skip this command.
	 */
	if (changed)
		hci_req_add(req, HCI_OP_SET_EVENT_MASK_PAGE_2,
			    sizeof(events), events);
}

static int hci_init3_req(struct hci_request *req, unsigned long opt)
{
	struct hci_dev *hdev = req->hdev;
	u8 p;

	hci_setup_event_mask(req);

	if (hdev->commands[6] & 0x20 &&
	    !test_bit(HCI_QUIRK_BROKEN_STORED_LINK_KEY, &hdev->quirks)) {
		struct hci_cp_read_stored_link_key cp;

		bacpy(&cp.bdaddr, BDADDR_ANY);
		cp.read_all = 0x01;
		hci_req_add(req, HCI_OP_READ_STORED_LINK_KEY, sizeof(cp), &cp);
	}

	if (hdev->commands[5] & 0x10)
		hci_setup_link_policy(req);

	if (hdev->commands[8] & 0x01)
		hci_req_add(req, HCI_OP_READ_PAGE_SCAN_ACTIVITY, 0, NULL);

	if (hdev->commands[18] & 0x04 &&
	    !test_bit(HCI_QUIRK_BROKEN_ERR_DATA_REPORTING, &hdev->quirks))
		hci_req_add(req, HCI_OP_READ_DEF_ERR_DATA_REPORTING, 0, NULL);

	/* Some older Broadcom based Bluetooth 1.2 controllers do not
	 * support the Read Page Scan Type command. Check support for
	 * this command in the bit mask of supported commands.
	 */
	if (hdev->commands[13] & 0x01)
		hci_req_add(req, HCI_OP_READ_PAGE_SCAN_TYPE, 0, NULL);

	if (lmp_le_capable(hdev)) {
		u8 events[8];

		memset(events, 0, sizeof(events));

		if (hdev->le_features[0] & HCI_LE_ENCRYPTION)
			events[0] |= 0x10;	/* LE Long Term Key Request */

		/* If controller supports the Connection Parameters Request
		 * Link Layer Procedure, enable the corresponding event.
		 */
		if (hdev->le_features[0] & HCI_LE_CONN_PARAM_REQ_PROC)
			events[0] |= 0x20;	/* LE Remote Connection
						 * Parameter Request
						 */

		/* If the controller supports the Data Length Extension
		 * feature, enable the corresponding event.
		 */
		if (hdev->le_features[0] & HCI_LE_DATA_LEN_EXT)
			events[0] |= 0x40;	/* LE Data Length Change */

		/* If the controller supports LL Privacy feature, enable
		 * the corresponding event.
		 */
		if (hdev->le_features[0] & HCI_LE_LL_PRIVACY)
			events[1] |= 0x02;	/* LE Enhanced Connection
						 * Complete
						 */

		/* If the controller supports Extended Scanner Filter
		 * Policies, enable the corresponding event.
		 */
		if (hdev->le_features[0] & HCI_LE_EXT_SCAN_POLICY)
			events[1] |= 0x04;	/* LE Direct Advertising
						 * Report
						 */

		/* If the controller supports Channel Selection Algorithm #2
		 * feature, enable the corresponding event.
		 */
		if (hdev->le_features[1] & HCI_LE_CHAN_SEL_ALG2)
			events[2] |= 0x08;	/* LE Channel Selection
						 * Algorithm
						 */

		/* If the controller supports the LE Set Scan Enable command,
		 * enable the corresponding advertising report event.
		 */
		if (hdev->commands[26] & 0x08)
			events[0] |= 0x02;	/* LE Advertising Report */

		/* If the controller supports the LE Create Connection
		 * command, enable the corresponding event.
		 */
		if (hdev->commands[26] & 0x10)
			events[0] |= 0x01;	/* LE Connection Complete */

		/* If the controller supports the LE Connection Update
		 * command, enable the corresponding event.
		 */
		if (hdev->commands[27] & 0x04)
			events[0] |= 0x04;	/* LE Connection Update
						 * Complete
						 */

		/* If the controller supports the LE Read Remote Used Features
		 * command, enable the corresponding event.
		 */
		if (hdev->commands[27] & 0x20)
			events[0] |= 0x08;	/* LE Read Remote Used
						 * Features Complete
						 */

		/* If the controller supports the LE Read Local P-256
		 * Public Key command, enable the corresponding event.
		 */
		if (hdev->commands[34] & 0x02)
			events[0] |= 0x80;	/* LE Read Local P-256
						 * Public Key Complete
						 */

		/* If the controller supports the LE Generate DHKey
		 * command, enable the corresponding event.
		 */
		if (hdev->commands[34] & 0x04)
			events[1] |= 0x01;	/* LE Generate DHKey Complete */

		/* If the controller supports the LE Set Default PHY or
		 * LE Set PHY commands, enable the corresponding event.
		 */
		if (hdev->commands[35] & (0x20 | 0x40))
			events[1] |= 0x08;        /* LE PHY Update Complete */

		/* If the controller supports LE Set Extended Scan Parameters
		 * and LE Set Extended Scan Enable commands, enable the
		 * corresponding event.
		 */
		if (use_ext_scan(hdev))
			events[1] |= 0x10;	/* LE Extended Advertising
						 * Report
						 */

		/* If the controller supports the LE Extended Advertising
		 * command, enable the corresponding event.
		 */
		if (ext_adv_capable(hdev))
			events[2] |= 0x02;	/* LE Advertising Set
						 * Terminated
						 */

		hci_req_add(req, HCI_OP_LE_SET_EVENT_MASK, sizeof(events),
			    events);

		/* Read LE Advertising Channel TX Power */
		if ((hdev->commands[25] & 0x40) && !ext_adv_capable(hdev)) {
			/* HCI TS spec forbids mixing of legacy and extended
			 * advertising commands wherein READ_ADV_TX_POWER is
			 * also included. So do not call it if extended adv
			 * is supported otherwise controller will return
			 * COMMAND_DISALLOWED for extended commands.
			 */
			hci_req_add(req, HCI_OP_LE_READ_ADV_TX_POWER, 0, NULL);
		}

		if (hdev->commands[38] & 0x80) {
			/* Read LE Min/Max Tx Power*/
			hci_req_add(req, HCI_OP_LE_READ_TRANSMIT_POWER,
				    0, NULL);
		}

		if (hdev->commands[26] & 0x40) {
			/* Read LE White List Size */
			hci_req_add(req, HCI_OP_LE_READ_WHITE_LIST_SIZE,
				    0, NULL);
		}

		if (hdev->commands[26] & 0x80) {
			/* Clear LE White List */
			hci_req_add(req, HCI_OP_LE_CLEAR_WHITE_LIST, 0, NULL);
		}

		if (hdev->commands[34] & 0x40) {
			/* Read LE Resolving List Size */
			hci_req_add(req, HCI_OP_LE_READ_RESOLV_LIST_SIZE,
				    0, NULL);
		}

		if (hdev->commands[34] & 0x20) {
			/* Clear LE Resolving List */
			hci_req_add(req, HCI_OP_LE_CLEAR_RESOLV_LIST, 0, NULL);
		}

		if (hdev->commands[35] & 0x04) {
			__le16 rpa_timeout = cpu_to_le16(hdev->rpa_timeout);

			/* Set RPA timeout */
			hci_req_add(req, HCI_OP_LE_SET_RPA_TIMEOUT, 2,
				    &rpa_timeout);
		}

		if (hdev->le_features[0] & HCI_LE_DATA_LEN_EXT) {
			/* Read LE Maximum Data Length */
			hci_req_add(req, HCI_OP_LE_READ_MAX_DATA_LEN, 0, NULL);

			/* Read LE Suggested Default Data Length */
			hci_req_add(req, HCI_OP_LE_READ_DEF_DATA_LEN, 0, NULL);
		}

		if (ext_adv_capable(hdev)) {
			/* Read LE Number of Supported Advertising Sets */
			hci_req_add(req, HCI_OP_LE_READ_NUM_SUPPORTED_ADV_SETS,
				    0, NULL);
		}

		hci_set_le_support(req);
	}

	/* Read features beyond page 1 if available */
	for (p = 2; p < HCI_MAX_PAGES && p <= hdev->max_page; p++) {
		struct hci_cp_read_local_ext_features cp;

		cp.page = p;
		hci_req_add(req, HCI_OP_READ_LOCAL_EXT_FEATURES,
			    sizeof(cp), &cp);
	}

	return 0;
}

static int hci_init4_req(struct hci_request *req, unsigned long opt)
{
	struct hci_dev *hdev = req->hdev;

	/* Some Broadcom based Bluetooth controllers do not support the
	 * Delete Stored Link Key command. They are clearly indicating its
	 * absence in the bit mask of supported commands.
	 *
	 * Check the supported commands and only if the command is marked
	 * as supported send it. If not supported assume that the controller
	 * does not have actual support for stored link keys which makes this
	 * command redundant anyway.
	 *
	 * Some controllers indicate that they support handling deleting
	 * stored link keys, but they don't. The quirk lets a driver
	 * just disable this command.
	 */
	if (hdev->commands[6] & 0x80 &&
	    !test_bit(HCI_QUIRK_BROKEN_STORED_LINK_KEY, &hdev->quirks)) {
		struct hci_cp_delete_stored_link_key cp;

		bacpy(&cp.bdaddr, BDADDR_ANY);
		cp.delete_all = 0x01;
		hci_req_add(req, HCI_OP_DELETE_STORED_LINK_KEY,
			    sizeof(cp), &cp);
	}

	/* Set event mask page 2 if the HCI command for it is supported */
	if (hdev->commands[22] & 0x04)
		hci_set_event_mask_page_2(req);

	/* Read local codec list if the HCI command is supported */
	if (hdev->commands[29] & 0x20)
		hci_req_add(req, HCI_OP_READ_LOCAL_CODECS, 0, NULL);

	/* Read local pairing options if the HCI command is supported */
	if (hdev->commands[41] & 0x08)
		hci_req_add(req, HCI_OP_READ_LOCAL_PAIRING_OPTS, 0, NULL);

	/* Get MWS transport configuration if the HCI command is supported */
	if (hdev->commands[30] & 0x08)
		hci_req_add(req, HCI_OP_GET_MWS_TRANSPORT_CONFIG, 0, NULL);

	/* Check for Synchronization Train support */
	if (lmp_sync_train_capable(hdev))
		hci_req_add(req, HCI_OP_READ_SYNC_TRAIN_PARAMS, 0, NULL);

	/* Enable Secure Connections if supported and configured */
	if (hci_dev_test_flag(hdev, HCI_SSP_ENABLED) &&
	    bredr_sc_enabled(hdev)) {
		u8 support = 0x01;

		hci_req_add(req, HCI_OP_WRITE_SC_SUPPORT,
			    sizeof(support), &support);
	}

	/* Set erroneous data reporting if supported to the wideband speech
	 * setting value
	 */
	if (hdev->commands[18] & 0x08 &&
	    !test_bit(HCI_QUIRK_BROKEN_ERR_DATA_REPORTING, &hdev->quirks)) {
		bool enabled = hci_dev_test_flag(hdev,
						 HCI_WIDEBAND_SPEECH_ENABLED);

		if (enabled !=
		    (hdev->err_data_reporting == ERR_DATA_REPORTING_ENABLED)) {
			struct hci_cp_write_def_err_data_reporting cp;

			cp.err_data_reporting = enabled ?
						ERR_DATA_REPORTING_ENABLED :
						ERR_DATA_REPORTING_DISABLED;

			hci_req_add(req, HCI_OP_WRITE_DEF_ERR_DATA_REPORTING,
				    sizeof(cp), &cp);
		}
	}

	/* Set Suggested Default Data Length to maximum if supported */
	if (hdev->le_features[0] & HCI_LE_DATA_LEN_EXT) {
		struct hci_cp_le_write_def_data_len cp;

		cp.tx_len = cpu_to_le16(hdev->le_max_tx_len);
		cp.tx_time = cpu_to_le16(hdev->le_max_tx_time);
		hci_req_add(req, HCI_OP_LE_WRITE_DEF_DATA_LEN, sizeof(cp), &cp);
	}

	/* Set Default PHY parameters if command is supported */
	if (hdev->commands[35] & 0x20) {
		struct hci_cp_le_set_default_phy cp;

		cp.all_phys = 0x00;
		cp.tx_phys = hdev->le_tx_def_phys;
		cp.rx_phys = hdev->le_rx_def_phys;

		hci_req_add(req, HCI_OP_LE_SET_DEFAULT_PHY, sizeof(cp), &cp);
	}

	return 0;
}

static int __hci_init(struct hci_dev *hdev)
{
	int err;

	err = __hci_req_sync(hdev, hci_init1_req, 0, HCI_INIT_TIMEOUT, NULL);
	if (err < 0)
		return err;

	if (hci_dev_test_flag(hdev, HCI_SETUP))
		hci_debugfs_create_basic(hdev);

	err = __hci_req_sync(hdev, hci_init2_req, 0, HCI_INIT_TIMEOUT, NULL);
	if (err < 0)
		return err;

	/* HCI_PRIMARY covers both single-mode LE, BR/EDR and dual-mode
	 * BR/EDR/LE type controllers. AMP controllers only need the
	 * first two stages of init.
	 */
	if (hdev->dev_type != HCI_PRIMARY)
		return 0;

	err = __hci_req_sync(hdev, hci_init3_req, 0, HCI_INIT_TIMEOUT, NULL);
	if (err < 0)
		return err;

	err = __hci_req_sync(hdev, hci_init4_req, 0, HCI_INIT_TIMEOUT, NULL);
	if (err < 0)
		return err;

	/* This function is only called when the controller is actually in
	 * configured state. When the controller is marked as unconfigured,
	 * this initialization procedure is not run.
	 *
	 * It means that it is possible that a controller runs through its
	 * setup phase and then discovers missing settings. If that is the
	 * case, then this function will not be called. It then will only
	 * be called during the config phase.
	 *
	 * So only when in setup phase or config phase, create the debugfs
	 * entries and register the SMP channels.
	 */
	if (!hci_dev_test_flag(hdev, HCI_SETUP) &&
	    !hci_dev_test_flag(hdev, HCI_CONFIG))
		return 0;

	hci_debugfs_create_common(hdev);

	if (lmp_bredr_capable(hdev))
		hci_debugfs_create_bredr(hdev);

	if (lmp_le_capable(hdev))
		hci_debugfs_create_le(hdev);

	return 0;
}

static int hci_init0_req(struct hci_request *req, unsigned long opt)
{
	struct hci_dev *hdev = req->hdev;

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

	/* Reset */
	if (!test_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks))
		hci_reset_req(req, 0);

	/* Read Local Version */
	hci_req_add(req, HCI_OP_READ_LOCAL_VERSION, 0, NULL);

	/* Read BD Address */
	if (hdev->set_bdaddr)
		hci_req_add(req, HCI_OP_READ_BD_ADDR, 0, NULL);

	return 0;
}

static int __hci_unconf_init(struct hci_dev *hdev)
{
	int err;

	if (test_bit(HCI_QUIRK_RAW_DEVICE, &hdev->quirks))
		return 0;

	err = __hci_req_sync(hdev, hci_init0_req, 0, HCI_INIT_TIMEOUT, NULL);
	if (err < 0)
		return err;

	if (hci_dev_test_flag(hdev, HCI_SETUP))
		hci_debugfs_create_basic(hdev);

	return 0;
}

static int hci_scan_req(struct hci_request *req, unsigned long opt)
{
	__u8 scan = opt;

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

	/* Inquiry and Page scans */
	hci_req_add(req, HCI_OP_WRITE_SCAN_ENABLE, 1, &scan);
	return 0;
}

static int hci_auth_req(struct hci_request *req, unsigned long opt)
{
	__u8 auth = opt;

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

	/* Authentication */
	hci_req_add(req, HCI_OP_WRITE_AUTH_ENABLE, 1, &auth);
	return 0;
}

static int hci_encrypt_req(struct hci_request *req, unsigned long opt)
{
	__u8 encrypt = opt;

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

	/* Encryption */
	hci_req_add(req, HCI_OP_WRITE_ENCRYPT_MODE, 1, &encrypt);
	return 0;
}

static int hci_linkpol_req(struct hci_request *req, unsigned long opt)
{
	__le16 policy = cpu_to_le16(opt);

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

	/* Default link policy */
	hci_req_add(req, HCI_OP_WRITE_DEF_LINK_POLICY, 2, &policy);
	return 0;
}

/* Get HCI device by index.
 * Device is held on return. */
struct hci_dev *hci_dev_get(int index)
{
	struct hci_dev *hdev = NULL, *d;

	BT_DBG("%d", index);

	if (index < 0)
		return NULL;

	read_lock(&hci_dev_list_lock);
	list_for_each_entry(d, &hci_dev_list, list) {
		if (d->id == index) {
			hdev = hci_dev_hold(d);
			break;
		}
	}
	read_unlock(&hci_dev_list_lock);
	return hdev;
}

/* ---- Inquiry support ---- */

bool hci_discovery_active(struct hci_dev *hdev)
{
	struct discovery_state *discov = &hdev->discovery;

	switch (discov->state) {
	case DISCOVERY_FINDING:
	case DISCOVERY_RESOLVING:
		return true;

	default:
		return false;
	}
}

void hci_discovery_set_state(struct hci_dev *hdev, int state)
{
	int old_state = hdev->discovery.state;

	BT_DBG("%s state %u -> %u", hdev->name, hdev->discovery.state, state);

	if (old_state == state)
		return;

	hdev->discovery.state = state;

	switch (state) {
	case DISCOVERY_STOPPED:
		hci_update_background_scan(hdev);

		if (old_state != DISCOVERY_STARTING)
			mgmt_discovering(hdev, 0);
		break;
	case DISCOVERY_STARTING:
		break;
	case DISCOVERY_FINDING:
		mgmt_discovering(hdev, 1);
		break;
	case DISCOVERY_RESOLVING:
		break;
	case DISCOVERY_STOPPING:
		break;
	}
}