bta/hh/bta_hh_utils.cc - platform/system/bt - Git at Google

 /******************************************************************************
  *
  *  Copyright (C) 2005-2012 Broadcom Corporation
  *
  *  Licensed under the Apache License, Version 2.0 (the "License");
  *  you may not use this file except in compliance with the License.
  *  You may obtain a copy of the License at:
  *
  *  http://www.apache.org/licenses/LICENSE-2.0
  *
  *  Unless required by applicable law or agreed to in writing, software
  *  distributed under the License is distributed on an "AS IS" BASIS,
  *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  *  See the License for the specific language governing permissions and
  *  limitations under the License.
  *
  ******************************************************************************/
 #include <string.h>

 #include "bt_target.h"
 #if (BTA_HH_INCLUDED == TRUE)

 #include "bta_hh_int.h"
 #include "osi/include/osi.h"

 /* if SSR max latency is not defined by remote device, set the default value
    as half of the link supervision timeout */
 #define BTA_HH_GET_DEF_SSR_MAX_LAT(x) ((x) >> 1)

 /*****************************************************************************
  *  Constants
  ****************************************************************************/
 #define BTA_HH_KB_CTRL_MASK 0x11
 #define BTA_HH_KB_SHIFT_MASK 0x22
 #define BTA_HH_KB_ALT_MASK 0x44
 #define BTA_HH_KB_GUI_MASK 0x88

 #define BTA_HH_KB_CAPS_LOCK 0x39 /* caps lock */
 #define BTA_HH_KB_NUM_LOCK 0x53  /* num lock */

 #define BTA_HH_MAX_RPT_CHARS 8

 static const uint8_t bta_hh_mod_key_mask[BTA_HH_MOD_MAX_KEY] = {
     BTA_HH_KB_CTRL_MASK, BTA_HH_KB_SHIFT_MASK, BTA_HH_KB_ALT_MASK,
     BTA_HH_KB_GUI_MASK};

 /*******************************************************************************
  *
  * Function         bta_hh_find_cb
  *
  * Description      Find best available control block according to BD address.
  *
  *
  * Returns          void
  *
  ******************************************************************************/
 uint8_t bta_hh_find_cb(const RawAddress& bda) {
   uint8_t xx;

   /* See how many active devices there are. */
   for (xx = 0; xx < BTA_HH_MAX_DEVICE; xx++) {
     /* check if any active/known devices is a match */
     if ((bda == bta_hh_cb.kdev[xx].addr && !bda.IsEmpty())) {
 #if (BTA_HH_DEBUG == TRUE)
       APPL_TRACE_DEBUG("found kdev_cb[%d] hid_handle = %d ", xx,
                        bta_hh_cb.kdev[xx].hid_handle)
 #endif
       return xx;
     }
 #if (BTA_HH_DEBUG == TRUE)
     else
       APPL_TRACE_DEBUG("in_use ? [%d] kdev[%d].hid_handle = %d state = [%d]",
                        bta_hh_cb.kdev[xx].in_use, xx,
                        bta_hh_cb.kdev[xx].hid_handle, bta_hh_cb.kdev[xx].state);
 #endif
   }

   /* if no active device match, find a spot for it */
   for (xx = 0; xx < BTA_HH_MAX_DEVICE; xx++) {
     if (!bta_hh_cb.kdev[xx].in_use) {
       bta_hh_cb.kdev[xx].addr = bda;
       break;
     }
   }
 /* If device list full, report BTA_HH_IDX_INVALID */
 #if (BTA_HH_DEBUG == TRUE)
   APPL_TRACE_DEBUG("bta_hh_find_cb:: index = %d while max = %d", xx,
                    BTA_HH_MAX_DEVICE);
 #endif

   if (xx == BTA_HH_MAX_DEVICE) xx = BTA_HH_IDX_INVALID;

   return xx;
 }

 /*******************************************************************************
  *
  * Function         bta_hh_clean_up_kdev
  *
  * Description      Clean up device control block when device is removed from
  *                  manitainace list, and update control block index map.
  *
  * Returns          void
  *
  ******************************************************************************/
 void bta_hh_clean_up_kdev(tBTA_HH_DEV_CB* p_cb) {
   uint8_t index;

   if (p_cb->hid_handle != BTA_HH_INVALID_HANDLE) {
 #if (BTA_HH_LE_INCLUDED == TRUE)
     if (p_cb->is_le_device)
       bta_hh_cb.le_cb_index[BTA_HH_GET_LE_CB_IDX(p_cb->hid_handle)] =
           BTA_HH_IDX_INVALID;
     else
 #endif
       bta_hh_cb.cb_index[p_cb->hid_handle] = BTA_HH_IDX_INVALID;
   }

   /* reset device control block */
   index = p_cb->index; /* Preserve index for this control block */

   /* Free buffer for report descriptor info */
   osi_free_and_reset((void**)&p_cb->dscp_info.descriptor.dsc_list);

   memset(p_cb, 0, sizeof(tBTA_HH_DEV_CB)); /* Reset control block */

   p_cb->index = index; /* Restore index for this control block */
   p_cb->state = BTA_HH_IDLE_ST;
   p_cb->hid_handle = BTA_HH_INVALID_HANDLE;
 }
 /*******************************************************************************
  *
  * Function         bta_hh_update_di_info
  *
  * Description      Maintain a known device list for BTA HH.
  *
  * Returns          void
  *
  ******************************************************************************/
 void bta_hh_update_di_info(tBTA_HH_DEV_CB* p_cb, uint16_t vendor_id,
                            uint16_t product_id, uint16_t version,
 #if (BTA_HH_LE_INCLUDED == TRUE)
                            uint8_t flag)
 #else
                            UNUSED_ATTR uint8_t flag)
 #endif
 {
 #if (BTA_HH_DEBUG == TRUE)
   APPL_TRACE_DEBUG("vendor_id = 0x%2x product_id = 0x%2x version = 0x%2x",
                    vendor_id, product_id, version);
 #endif
   p_cb->dscp_info.vendor_id = vendor_id;
   p_cb->dscp_info.product_id = product_id;
   p_cb->dscp_info.version = version;
 #if (BTA_HH_LE_INCLUDED == TRUE)
   p_cb->dscp_info.flag = flag;
 #endif
 }
 /*******************************************************************************
  *
  * Function         bta_hh_add_device_to_list
  *
  * Description      Maintain a known device list for BTA HH.
  *
  * Returns          void
  *
  ******************************************************************************/
 void bta_hh_add_device_to_list(tBTA_HH_DEV_CB* p_cb, uint8_t handle,
                                uint16_t attr_mask,
                                tHID_DEV_DSCP_INFO* p_dscp_info,
                                uint8_t sub_class, uint16_t ssr_max_latency,
                                uint16_t ssr_min_tout, uint8_t app_id) {
 #if (BTA_HH_DEBUG == TRUE)
   APPL_TRACE_DEBUG("subclass = 0x%2x", sub_class);
 #endif

   p_cb->hid_handle = handle;
   p_cb->in_use = true;
   p_cb->attr_mask = attr_mask;

   p_cb->sub_class = sub_class;
   p_cb->app_id = app_id;

   p_cb->dscp_info.ssr_max_latency = ssr_max_latency;
   p_cb->dscp_info.ssr_min_tout = ssr_min_tout;

   /* store report descriptor info */
   if (p_dscp_info) {
     osi_free_and_reset((void**)&p_cb->dscp_info.descriptor.dsc_list);

     if (p_dscp_info->dl_len) {
       p_cb->dscp_info.descriptor.dsc_list =
           (uint8_t*)osi_malloc(p_dscp_info->dl_len);
       p_cb->dscp_info.descriptor.dl_len = p_dscp_info->dl_len;
       memcpy(p_cb->dscp_info.descriptor.dsc_list, p_dscp_info->dsc_list,
              p_dscp_info->dl_len);
     }
   }
 }

 /*******************************************************************************
  *
  * Function         bta_hh_tod_spt
  *
  * Description      Check to see if this type of device is supported
  *
  * Returns
  *
  ******************************************************************************/
 bool bta_hh_tod_spt(tBTA_HH_DEV_CB* p_cb, uint8_t sub_class) {
   uint8_t xx;
   uint8_t cod = (sub_class >> 2); /* lower two bits are reserved */

   for (xx = 0; xx < p_bta_hh_cfg->max_devt_spt; xx++) {
     if (cod == (uint8_t)p_bta_hh_cfg->p_devt_list[xx].tod) {
       p_cb->app_id = p_bta_hh_cfg->p_devt_list[xx].app_id;
 #if (BTA_HH_DEBUG == TRUE)
       APPL_TRACE_EVENT("bta_hh_tod_spt sub_class:0x%x supported", sub_class);
 #endif
       return true;
     }
   }
 #if (BTA_HH_DEBUG == TRUE)
   APPL_TRACE_EVENT("bta_hh_tod_spt sub_class:0x%x NOT supported", sub_class);
 #endif
   return false;
 }

 /*******************************************************************************
  *
  * Function         bta_hh_parse_keybd_rpt
  *
  * Description      This utility function parse a boot mode keyboard report.
  *
  * Returns          void
  *
  ******************************************************************************/
 void bta_hh_parse_keybd_rpt(tBTA_HH_BOOT_RPT* p_kb_data, uint8_t* p_report,
                             uint16_t report_len) {
   tBTA_HH_KB_CB* p_kb = &bta_hh_cb.kb_cb;
   tBTA_HH_KEYBD_RPT* p_data = &p_kb_data->data_rpt.keybd_rpt;

   uint8_t this_char, ctl_shift;
   uint16_t xx, yy, key_idx = 0;
   uint8_t this_report[BTA_HH_MAX_RPT_CHARS];

 #if (BTA_HH_DEBUG == TRUE)
   APPL_TRACE_DEBUG("bta_hh_parse_keybd_rpt:  (report=%p, report_len=%d) called",
                    p_report, report_len);
 #endif

   if (report_len < 2) return;

   ctl_shift = *p_report++;
   report_len--;

   if (report_len > BTA_HH_MAX_RPT_CHARS) report_len = BTA_HH_MAX_RPT_CHARS;

   memset(this_report, 0, BTA_HH_MAX_RPT_CHARS);
   memset(p_data, 0, sizeof(tBTA_HH_KEYBD_RPT));
   memcpy(this_report, p_report, report_len);

   /* Take care of shift, control, GUI and alt, modifier keys  */
   for (xx = 0; xx < BTA_HH_MOD_MAX_KEY; xx++) {
     if (ctl_shift & bta_hh_mod_key_mask[xx]) {
       APPL_TRACE_DEBUG("Mod Key[%02x] pressed", bta_hh_mod_key_mask[xx]);
       p_kb->mod_key[xx] = true;
     } else if (p_kb->mod_key[xx]) {
       p_kb->mod_key[xx] = false;
     }
     /* control key flag is set */
     p_data->mod_key[xx] = p_kb->mod_key[xx];
   }

   /***************************************************************************/
   /*  First step is to remove all characters we saw in the last report       */
   /***************************************************************************/
   for (xx = 0; xx < report_len; xx++) {
     for (yy = 0; yy < BTA_HH_MAX_RPT_CHARS; yy++) {
       if (this_report[xx] == p_kb->last_report[yy]) {
         this_report[xx] = 0;
       }
     }
   }
   /***************************************************************************/
   /*  Now, process all the characters in the report, up to 6 keycodes        */
   /***************************************************************************/
   for (xx = 0; xx < report_len; xx++) {
 #if (BTA_HH_DEBUG == TRUE)
     APPL_TRACE_DEBUG("this_char = %02x", this_report[xx]);
 #endif
     this_char = this_report[xx];
     if (this_char == 0) continue;
     /* take the key code as the report data */
     if (this_report[xx] == BTA_HH_KB_CAPS_LOCK)
       p_kb->caps_lock = p_kb->caps_lock ? false : true;
     else if (this_report[xx] == BTA_HH_KB_NUM_LOCK)
       p_kb->num_lock = p_kb->num_lock ? false : true;
     else
       p_data->this_char[key_idx++] = this_char;

 #if (BTA_HH_DEBUG == TRUE)
     APPL_TRACE_DEBUG("found keycode %02x ", this_report[xx]);
 #endif
     p_data->caps_lock = p_kb->caps_lock;
     p_data->num_lock = p_kb->num_lock;
   }

   memset(p_kb->last_report, 0, BTA_HH_MAX_RPT_CHARS);
   memcpy(p_kb->last_report, p_report, report_len);

   return;
 }

 /*******************************************************************************
  *
  * Function         bta_hh_parse_mice_rpt
  *
  * Description      This utility function parse a boot mode mouse report.
  *
  * Returns          void
  *
  ******************************************************************************/
 void bta_hh_parse_mice_rpt(tBTA_HH_BOOT_RPT* p_mice_data, uint8_t* p_report,
                            uint16_t report_len) {
   tBTA_HH_MICE_RPT* p_data = &p_mice_data->data_rpt.mice_rpt;
 #if (BTA_HH_DEBUG == TRUE)
   uint8_t xx;

   APPL_TRACE_DEBUG(
       "bta_hh_parse_mice_rpt:  bta_keybd_rpt_rcvd(report=%p, \
                 report_len=%d) called",
       p_report, report_len);
 #endif

   if (report_len < 3) return;

   if (report_len > BTA_HH_MAX_RPT_CHARS) report_len = BTA_HH_MAX_RPT_CHARS;

 #if (BTA_HH_DEBUG == TRUE)
   for (xx = 0; xx < report_len; xx++) {
     APPL_TRACE_DEBUG("this_char = %02x", p_report[xx]);
   }
 #endif

   /* only first bytes lower 3 bits valid */
   p_data->mouse_button = (p_report[0] & 0x07);

   /* x displacement */
   p_data->delta_x = p_report[1];

   /* y displacement */
   p_data->delta_y = p_report[2];

 #if (BTA_HH_DEBUG == TRUE)
   APPL_TRACE_DEBUG("mice button: 0x%2x", p_data->mouse_button);
   APPL_TRACE_DEBUG("mice move: x = %d y = %d", p_data->delta_x,
                    p_data->delta_y);
 #endif

   return;
 }

 /*******************************************************************************
  *
  * Function         bta_hh_read_ssr_param
  *
  * Description      Read the SSR Parameter for the remote device
  *
  * Returns          tBTA_HH_STATUS  operation status
  *
  ******************************************************************************/
 tBTA_HH_STATUS bta_hh_read_ssr_param(const RawAddress& bd_addr,
                                      uint16_t* p_max_ssr_lat,
                                      uint16_t* p_min_ssr_tout) {
   tBTA_HH_STATUS status = BTA_HH_ERR;
   tBTA_HH_CB* p_cb = &bta_hh_cb;
   uint8_t i;
   uint16_t ssr_max_latency;
   for (i = 0; i < BTA_HH_MAX_KNOWN; i++) {
     if (p_cb->kdev[i].addr == bd_addr) {
       /* if remote device does not have HIDSSRHostMaxLatency attribute in SDP,
       set SSR max latency default value here.  */
       if (p_cb->kdev[i].dscp_info.ssr_max_latency == HID_SSR_PARAM_INVALID) {
         /* The default is calculated as half of link supervision timeout.*/

         BTM_GetLinkSuperTout(p_cb->kdev[i].addr, &ssr_max_latency);
         ssr_max_latency = BTA_HH_GET_DEF_SSR_MAX_LAT(ssr_max_latency);

         /* per 1.1 spec, if the newly calculated max latency is greater than
         BTA_HH_SSR_MAX_LATENCY_DEF which is 500ms, use
         BTA_HH_SSR_MAX_LATENCY_DEF */
         if (ssr_max_latency > BTA_HH_SSR_MAX_LATENCY_DEF)
           ssr_max_latency = BTA_HH_SSR_MAX_LATENCY_DEF;

         *p_max_ssr_lat = ssr_max_latency;
       } else
         *p_max_ssr_lat = p_cb->kdev[i].dscp_info.ssr_max_latency;

       if (p_cb->kdev[i].dscp_info.ssr_min_tout == HID_SSR_PARAM_INVALID)
         *p_min_ssr_tout = BTA_HH_SSR_MIN_TOUT_DEF;
       else
         *p_min_ssr_tout = p_cb->kdev[i].dscp_info.ssr_min_tout;

       status = BTA_HH_OK;

       break;
     }
   }

   return status;
 }

 /*******************************************************************************
  *
  * Function         bta_hh_cleanup_disable
  *
  * Description      when disable finished, cleanup control block and send
  *                  callback
  *
  *
  * Returns          void
  *
  ******************************************************************************/
 void bta_hh_cleanup_disable(tBTA_HH_STATUS status) {
   uint8_t xx;
   /* free buffer in CB holding report descriptors */
   for (xx = 0; xx < BTA_HH_MAX_DEVICE; xx++) {
     osi_free_and_reset(
         (void**)&bta_hh_cb.kdev[xx].dscp_info.descriptor.dsc_list);
   }

   if (bta_hh_cb.p_disc_db) {
     /* Cancel SDP if it had been started. */
     (void)SDP_CancelServiceSearch (bta_hh_cb.p_disc_db);
     osi_free_and_reset((void**)&bta_hh_cb.p_disc_db);
   }

   if (bta_hh_cb.p_cback) {
     (*bta_hh_cb.p_cback)(BTA_HH_DISABLE_EVT, (tBTA_HH*)&status);
     /* all connections are down, no waiting for diconnect */
     memset(&bta_hh_cb, 0, sizeof(tBTA_HH_CB));
   }
 }

 /*******************************************************************************
  *
  * Function         bta_hh_dev_handle_to_cb_idx
  *
  * Description      convert a HID device handle to the device control block
  *                  index.
  *
  *
  * Returns          uint8_t: index of the device control block.
  *
  ******************************************************************************/
 uint8_t bta_hh_dev_handle_to_cb_idx(uint8_t dev_handle) {
   uint8_t index = BTA_HH_IDX_INVALID;

 #if (BTA_HH_LE_INCLUDED == TRUE)
   if (BTA_HH_IS_LE_DEV_HDL(dev_handle)) {
     if (BTA_HH_IS_LE_DEV_HDL_VALID(dev_handle))
       index = bta_hh_cb.le_cb_index[BTA_HH_GET_LE_CB_IDX(dev_handle)];
 #if (BTA_HH_DEBUG == TRUE)
     APPL_TRACE_DEBUG("bta_hh_dev_handle_to_cb_idx dev_handle = %d index = %d",
                      dev_handle, index);
 #endif
   } else
 #endif
       /* regular HID device checking */
       if (dev_handle < BTA_HH_MAX_KNOWN)
     index = bta_hh_cb.cb_index[dev_handle];

   return index;
 }
 #if (BTA_HH_DEBUG == TRUE)
 /*******************************************************************************
  *
  * Function         bta_hh_trace_dev_db
  *
  * Description      Check to see if this type of device is supported
  *
  * Returns
  *
  ******************************************************************************/
 void bta_hh_trace_dev_db(void) {
   uint8_t xx;

   APPL_TRACE_DEBUG("bta_hh_trace_dev_db:: Device DB list********************");

   for (xx = 0; xx < BTA_HH_MAX_DEVICE; xx++) {
     APPL_TRACE_DEBUG("kdev[%d] in_use[%d]  handle[%d] ", xx,
                      bta_hh_cb.kdev[xx].in_use, bta_hh_cb.kdev[xx].hid_handle);

     APPL_TRACE_DEBUG(
         "\t\t\t attr_mask[%04x] state [%d] sub_class[%02x] index = %d",
         bta_hh_cb.kdev[xx].attr_mask, bta_hh_cb.kdev[xx].state,
         bta_hh_cb.kdev[xx].sub_class, bta_hh_cb.kdev[xx].index);
   }
   APPL_TRACE_DEBUG("*********************************************************");
 }
 #endif
 #endif /* HL_INCLUDED */
	/******************************************************************************
	*
	* Copyright (C) 2005-2012 Broadcom Corporation
	*
	* Licensed under the Apache License, Version 2.0 (the "License");
	* you may not use this file except in compliance with the License.
	* You may obtain a copy of the License at:
	*
	* http://www.apache.org/licenses/LICENSE-2.0
	*
	* Unless required by applicable law or agreed to in writing, software
	* distributed under the License is distributed on an "AS IS" BASIS,
	* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	* See the License for the specific language governing permissions and
	* limitations under the License.
	*
	******************************************************************************/
	#include <string.h>

	#include "bt_target.h"
	#if (BTA_HH_INCLUDED == TRUE)

	#include "bta_hh_int.h"
	#include "osi/include/osi.h"

	/* if SSR max latency is not defined by remote device, set the default value
	as half of the link supervision timeout */
	#define BTA_HH_GET_DEF_SSR_MAX_LAT(x) ((x) >> 1)

	/*****************************************************************************
	* Constants
	****************************************************************************/
	#define BTA_HH_KB_CTRL_MASK 0x11
	#define BTA_HH_KB_SHIFT_MASK 0x22
	#define BTA_HH_KB_ALT_MASK 0x44
	#define BTA_HH_KB_GUI_MASK 0x88

	#define BTA_HH_KB_CAPS_LOCK 0x39 /* caps lock */
	#define BTA_HH_KB_NUM_LOCK 0x53 /* num lock */

	#define BTA_HH_MAX_RPT_CHARS 8

	static const uint8_t bta_hh_mod_key_mask[BTA_HH_MOD_MAX_KEY] = {
	BTA_HH_KB_CTRL_MASK, BTA_HH_KB_SHIFT_MASK, BTA_HH_KB_ALT_MASK,
	BTA_HH_KB_GUI_MASK};

	/*******************************************************************************
	*
	* Function bta_hh_find_cb
	*
	* Description Find best available control block according to BD address.
	*
	*
	* Returns void
	*
	******************************************************************************/
	uint8_t bta_hh_find_cb(const RawAddress& bda) {
	uint8_t xx;

	/* See how many active devices there are. */
	for (xx = 0; xx < BTA_HH_MAX_DEVICE; xx++) {
	/* check if any active/known devices is a match */
	if ((bda == bta_hh_cb.kdev[xx].addr && !bda.IsEmpty())) {
	#if (BTA_HH_DEBUG == TRUE)
	APPL_TRACE_DEBUG("found kdev_cb[%d] hid_handle = %d ", xx,
	bta_hh_cb.kdev[xx].hid_handle)
	#endif
	return xx;
	}
	#if (BTA_HH_DEBUG == TRUE)
	else
	APPL_TRACE_DEBUG("in_use ? [%d] kdev[%d].hid_handle = %d state = [%d]",
	bta_hh_cb.kdev[xx].in_use, xx,
	bta_hh_cb.kdev[xx].hid_handle, bta_hh_cb.kdev[xx].state);
	#endif
	}

	/* if no active device match, find a spot for it */
	for (xx = 0; xx < BTA_HH_MAX_DEVICE; xx++) {
	if (!bta_hh_cb.kdev[xx].in_use) {
	bta_hh_cb.kdev[xx].addr = bda;
	break;
	}
	}
	/* If device list full, report BTA_HH_IDX_INVALID */
	#if (BTA_HH_DEBUG == TRUE)
	APPL_TRACE_DEBUG("bta_hh_find_cb:: index = %d while max = %d", xx,
	BTA_HH_MAX_DEVICE);
	#endif

	if (xx == BTA_HH_MAX_DEVICE) xx = BTA_HH_IDX_INVALID;

	return xx;
	}

	/*******************************************************************************
	*
	* Function bta_hh_clean_up_kdev
	*
	* Description Clean up device control block when device is removed from
	* manitainace list, and update control block index map.
	*
	* Returns void
	*
	******************************************************************************/
	void bta_hh_clean_up_kdev(tBTA_HH_DEV_CB* p_cb) {
	uint8_t index;

	if (p_cb->hid_handle != BTA_HH_INVALID_HANDLE) {
	#if (BTA_HH_LE_INCLUDED == TRUE)
	if (p_cb->is_le_device)
	bta_hh_cb.le_cb_index[BTA_HH_GET_LE_CB_IDX(p_cb->hid_handle)] =
	BTA_HH_IDX_INVALID;
	else
	#endif
	bta_hh_cb.cb_index[p_cb->hid_handle] = BTA_HH_IDX_INVALID;
	}

	/* reset device control block */
	index = p_cb->index; /* Preserve index for this control block */

	/* Free buffer for report descriptor info */
	osi_free_and_reset((void**)&p_cb->dscp_info.descriptor.dsc_list);

	memset(p_cb, 0, sizeof(tBTA_HH_DEV_CB)); /* Reset control block */

	p_cb->index = index; /* Restore index for this control block */
	p_cb->state = BTA_HH_IDLE_ST;
	p_cb->hid_handle = BTA_HH_INVALID_HANDLE;
	}
	/*******************************************************************************
	*
	* Function bta_hh_update_di_info
	*
	* Description Maintain a known device list for BTA HH.
	*
	* Returns void
	*
	******************************************************************************/
	void bta_hh_update_di_info(tBTA_HH_DEV_CB* p_cb, uint16_t vendor_id,
	uint16_t product_id, uint16_t version,
	#if (BTA_HH_LE_INCLUDED == TRUE)
	uint8_t flag)
	#else
	UNUSED_ATTR uint8_t flag)
	#endif
	{
	#if (BTA_HH_DEBUG == TRUE)
	APPL_TRACE_DEBUG("vendor_id = 0x%2x product_id = 0x%2x version = 0x%2x",
	vendor_id, product_id, version);
	#endif
	p_cb->dscp_info.vendor_id = vendor_id;
	p_cb->dscp_info.product_id = product_id;
	p_cb->dscp_info.version = version;
	#if (BTA_HH_LE_INCLUDED == TRUE)
	p_cb->dscp_info.flag = flag;
	#endif
	}
	/*******************************************************************************
	*
	* Function bta_hh_add_device_to_list
	*
	* Description Maintain a known device list for BTA HH.
	*
	* Returns void
	*
	******************************************************************************/
	void bta_hh_add_device_to_list(tBTA_HH_DEV_CB* p_cb, uint8_t handle,
	uint16_t attr_mask,
	tHID_DEV_DSCP_INFO* p_dscp_info,
	uint8_t sub_class, uint16_t ssr_max_latency,
	uint16_t ssr_min_tout, uint8_t app_id) {
	#if (BTA_HH_DEBUG == TRUE)
	APPL_TRACE_DEBUG("subclass = 0x%2x", sub_class);
	#endif

	p_cb->hid_handle = handle;
	p_cb->in_use = true;
	p_cb->attr_mask = attr_mask;

	p_cb->sub_class = sub_class;
	p_cb->app_id = app_id;

	p_cb->dscp_info.ssr_max_latency = ssr_max_latency;
	p_cb->dscp_info.ssr_min_tout = ssr_min_tout;

	/* store report descriptor info */
	if (p_dscp_info) {
	osi_free_and_reset((void**)&p_cb->dscp_info.descriptor.dsc_list);

	if (p_dscp_info->dl_len) {
	p_cb->dscp_info.descriptor.dsc_list =
	(uint8_t*)osi_malloc(p_dscp_info->dl_len);
	p_cb->dscp_info.descriptor.dl_len = p_dscp_info->dl_len;
	memcpy(p_cb->dscp_info.descriptor.dsc_list, p_dscp_info->dsc_list,
	p_dscp_info->dl_len);
	}
	}
	}

	/*******************************************************************************
	*
	* Function bta_hh_tod_spt
	*
	* Description Check to see if this type of device is supported
	*
	* Returns
	*
	******************************************************************************/
	bool bta_hh_tod_spt(tBTA_HH_DEV_CB* p_cb, uint8_t sub_class) {
	uint8_t xx;
	uint8_t cod = (sub_class >> 2); /* lower two bits are reserved */

	for (xx = 0; xx < p_bta_hh_cfg->max_devt_spt; xx++) {
	if (cod == (uint8_t)p_bta_hh_cfg->p_devt_list[xx].tod) {
	p_cb->app_id = p_bta_hh_cfg->p_devt_list[xx].app_id;
	#if (BTA_HH_DEBUG == TRUE)
	APPL_TRACE_EVENT("bta_hh_tod_spt sub_class:0x%x supported", sub_class);
	#endif
	return true;
	}
	}
	#if (BTA_HH_DEBUG == TRUE)
	APPL_TRACE_EVENT("bta_hh_tod_spt sub_class:0x%x NOT supported", sub_class);
	#endif
	return false;
	}

	/*******************************************************************************
	*
	* Function bta_hh_parse_keybd_rpt
	*
	* Description This utility function parse a boot mode keyboard report.
	*
	* Returns void
	*
	******************************************************************************/
	void bta_hh_parse_keybd_rpt(tBTA_HH_BOOT_RPT* p_kb_data, uint8_t* p_report,
	uint16_t report_len) {
	tBTA_HH_KB_CB* p_kb = &bta_hh_cb.kb_cb;
	tBTA_HH_KEYBD_RPT* p_data = &p_kb_data->data_rpt.keybd_rpt;

	uint8_t this_char, ctl_shift;
	uint16_t xx, yy, key_idx = 0;
	uint8_t this_report[BTA_HH_MAX_RPT_CHARS];

	#if (BTA_HH_DEBUG == TRUE)
	APPL_TRACE_DEBUG("bta_hh_parse_keybd_rpt: (report=%p, report_len=%d) called",
	p_report, report_len);
	#endif

	if (report_len < 2) return;

	ctl_shift = *p_report++;
	report_len--;

	if (report_len > BTA_HH_MAX_RPT_CHARS) report_len = BTA_HH_MAX_RPT_CHARS;

	memset(this_report, 0, BTA_HH_MAX_RPT_CHARS);
	memset(p_data, 0, sizeof(tBTA_HH_KEYBD_RPT));
	memcpy(this_report, p_report, report_len);

	/* Take care of shift, control, GUI and alt, modifier keys */
	for (xx = 0; xx < BTA_HH_MOD_MAX_KEY; xx++) {
	if (ctl_shift & bta_hh_mod_key_mask[xx]) {
	APPL_TRACE_DEBUG("Mod Key[%02x] pressed", bta_hh_mod_key_mask[xx]);
	p_kb->mod_key[xx] = true;
	} else if (p_kb->mod_key[xx]) {
	p_kb->mod_key[xx] = false;
	}
	/* control key flag is set */
	p_data->mod_key[xx] = p_kb->mod_key[xx];
	}

	/***************************************************************************/
	/* First step is to remove all characters we saw in the last report */
	/***************************************************************************/
	for (xx = 0; xx < report_len; xx++) {
	for (yy = 0; yy < BTA_HH_MAX_RPT_CHARS; yy++) {
	if (this_report[xx] == p_kb->last_report[yy]) {
	this_report[xx] = 0;
	}
	}
	}
	/***************************************************************************/
	/* Now, process all the characters in the report, up to 6 keycodes */
	/***************************************************************************/
	for (xx = 0; xx < report_len; xx++) {
	#if (BTA_HH_DEBUG == TRUE)
	APPL_TRACE_DEBUG("this_char = %02x", this_report[xx]);
	#endif
	this_char = this_report[xx];
	if (this_char == 0) continue;
	/* take the key code as the report data */
	if (this_report[xx] == BTA_HH_KB_CAPS_LOCK)
	p_kb->caps_lock = p_kb->caps_lock ? false : true;
	else if (this_report[xx] == BTA_HH_KB_NUM_LOCK)
	p_kb->num_lock = p_kb->num_lock ? false : true;
	else
	p_data->this_char[key_idx++] = this_char;

	#if (BTA_HH_DEBUG == TRUE)
	APPL_TRACE_DEBUG("found keycode %02x ", this_report[xx]);
	#endif
	p_data->caps_lock = p_kb->caps_lock;
	p_data->num_lock = p_kb->num_lock;
	}

	memset(p_kb->last_report, 0, BTA_HH_MAX_RPT_CHARS);
	memcpy(p_kb->last_report, p_report, report_len);

	return;
	}

	/*******************************************************************************
	*
	* Function bta_hh_parse_mice_rpt
	*
	* Description This utility function parse a boot mode mouse report.
	*
	* Returns void
	*
	******************************************************************************/
	void bta_hh_parse_mice_rpt(tBTA_HH_BOOT_RPT* p_mice_data, uint8_t* p_report,
	uint16_t report_len) {
	tBTA_HH_MICE_RPT* p_data = &p_mice_data->data_rpt.mice_rpt;
	#if (BTA_HH_DEBUG == TRUE)
	uint8_t xx;

	APPL_TRACE_DEBUG(
	"bta_hh_parse_mice_rpt: bta_keybd_rpt_rcvd(report=%p, \
	report_len=%d) called",
	p_report, report_len);
	#endif

	if (report_len < 3) return;

	if (report_len > BTA_HH_MAX_RPT_CHARS) report_len = BTA_HH_MAX_RPT_CHARS;

	#if (BTA_HH_DEBUG == TRUE)
	for (xx = 0; xx < report_len; xx++) {
	APPL_TRACE_DEBUG("this_char = %02x", p_report[xx]);
	}
	#endif

	/* only first bytes lower 3 bits valid */
	p_data->mouse_button = (p_report[0] & 0x07);

	/* x displacement */
	p_data->delta_x = p_report[1];

	/* y displacement */
	p_data->delta_y = p_report[2];

	#if (BTA_HH_DEBUG == TRUE)
	APPL_TRACE_DEBUG("mice button: 0x%2x", p_data->mouse_button);
	APPL_TRACE_DEBUG("mice move: x = %d y = %d", p_data->delta_x,
	p_data->delta_y);
	#endif

	return;
	}

	/*******************************************************************************
	*
	* Function bta_hh_read_ssr_param
	*
	* Description Read the SSR Parameter for the remote device
	*
	* Returns tBTA_HH_STATUS operation status
	*
	******************************************************************************/
	tBTA_HH_STATUS bta_hh_read_ssr_param(const RawAddress& bd_addr,
	uint16_t* p_max_ssr_lat,
	uint16_t* p_min_ssr_tout) {
	tBTA_HH_STATUS status = BTA_HH_ERR;
	tBTA_HH_CB* p_cb = &bta_hh_cb;
	uint8_t i;
	uint16_t ssr_max_latency;
	for (i = 0; i < BTA_HH_MAX_KNOWN; i++) {
	if (p_cb->kdev[i].addr == bd_addr) {
	/* if remote device does not have HIDSSRHostMaxLatency attribute in SDP,
	set SSR max latency default value here. */
	if (p_cb->kdev[i].dscp_info.ssr_max_latency == HID_SSR_PARAM_INVALID) {
	/* The default is calculated as half of link supervision timeout.*/

	BTM_GetLinkSuperTout(p_cb->kdev[i].addr, &ssr_max_latency);
	ssr_max_latency = BTA_HH_GET_DEF_SSR_MAX_LAT(ssr_max_latency);

	/* per 1.1 spec, if the newly calculated max latency is greater than
	BTA_HH_SSR_MAX_LATENCY_DEF which is 500ms, use
	BTA_HH_SSR_MAX_LATENCY_DEF */
	if (ssr_max_latency > BTA_HH_SSR_MAX_LATENCY_DEF)
	ssr_max_latency = BTA_HH_SSR_MAX_LATENCY_DEF;

	*p_max_ssr_lat = ssr_max_latency;
	} else
	*p_max_ssr_lat = p_cb->kdev[i].dscp_info.ssr_max_latency;

	if (p_cb->kdev[i].dscp_info.ssr_min_tout == HID_SSR_PARAM_INVALID)
	*p_min_ssr_tout = BTA_HH_SSR_MIN_TOUT_DEF;
	else
	*p_min_ssr_tout = p_cb->kdev[i].dscp_info.ssr_min_tout;

	status = BTA_HH_OK;

	break;
	}
	}

	return status;
	}

	/*******************************************************************************
	*
	* Function bta_hh_cleanup_disable
	*
	* Description when disable finished, cleanup control block and send
	* callback
	*
	*
	* Returns void
	*
	******************************************************************************/
	void bta_hh_cleanup_disable(tBTA_HH_STATUS status) {
	uint8_t xx;
	/* free buffer in CB holding report descriptors */
	for (xx = 0; xx < BTA_HH_MAX_DEVICE; xx++) {
	osi_free_and_reset(
	(void**)&bta_hh_cb.kdev[xx].dscp_info.descriptor.dsc_list);
	}

	if (bta_hh_cb.p_disc_db) {
	/* Cancel SDP if it had been started. */
	(void)SDP_CancelServiceSearch (bta_hh_cb.p_disc_db);
	osi_free_and_reset((void**)&bta_hh_cb.p_disc_db);
	}

	if (bta_hh_cb.p_cback) {
	(bta_hh_cb.p_cback)(BTA_HH_DISABLE_EVT, (tBTA_HH)&status);
	/* all connections are down, no waiting for diconnect */
	memset(&bta_hh_cb, 0, sizeof(tBTA_HH_CB));
	}
	}

	/*******************************************************************************
	*
	* Function bta_hh_dev_handle_to_cb_idx
	*
	* Description convert a HID device handle to the device control block
	* index.
	*
	*
	* Returns uint8_t: index of the device control block.
	*
	******************************************************************************/
	uint8_t bta_hh_dev_handle_to_cb_idx(uint8_t dev_handle) {
	uint8_t index = BTA_HH_IDX_INVALID;

	#if (BTA_HH_LE_INCLUDED == TRUE)
	if (BTA_HH_IS_LE_DEV_HDL(dev_handle)) {
	if (BTA_HH_IS_LE_DEV_HDL_VALID(dev_handle))
	index = bta_hh_cb.le_cb_index[BTA_HH_GET_LE_CB_IDX(dev_handle)];
	#if (BTA_HH_DEBUG == TRUE)
	APPL_TRACE_DEBUG("bta_hh_dev_handle_to_cb_idx dev_handle = %d index = %d",
	dev_handle, index);
	#endif
	} else
	#endif
	/* regular HID device checking */
	if (dev_handle < BTA_HH_MAX_KNOWN)
	index = bta_hh_cb.cb_index[dev_handle];

	return index;
	}
	#if (BTA_HH_DEBUG == TRUE)
	/*******************************************************************************
	*
	* Function bta_hh_trace_dev_db
	*
	* Description Check to see if this type of device is supported
	*
	* Returns
	*
	******************************************************************************/
	void bta_hh_trace_dev_db(void) {
	uint8_t xx;

	APPL_TRACE_DEBUG("bta_hh_trace_dev_db:: Device DB list********************");

	for (xx = 0; xx < BTA_HH_MAX_DEVICE; xx++) {
	APPL_TRACE_DEBUG("kdev[%d] in_use[%d] handle[%d] ", xx,
	bta_hh_cb.kdev[xx].in_use, bta_hh_cb.kdev[xx].hid_handle);

	APPL_TRACE_DEBUG(
	"\t\t\t attr_mask[%04x] state [%d] sub_class[%02x] index = %d",
	bta_hh_cb.kdev[xx].attr_mask, bta_hh_cb.kdev[xx].state,
	bta_hh_cb.kdev[xx].sub_class, bta_hh_cb.kdev[xx].index);
	}
	APPL_TRACE_DEBUG("*********************************************************");
	}
	#endif
	#endif /* HL_INCLUDED */