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ull_peripheral_iso.c
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ull_peripheral_iso.c
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/*
* Copyright (c) 2020 Demant
*
* SPDX-License-Identifier: Apache-2.0
*/
#include <zephyr.h>
#include <bluetooth/buf.h>
#include <sys/byteorder.h>
#define BT_DBG_ENABLED IS_ENABLED(CONFIG_BT_DEBUG_HCI_DRIVER)
#define LOG_MODULE_NAME bt_ctlr_ull_peripheral_iso
#include "common/log.h"
#include "hal/debug.h"
#include "util/memq.h"
#include "ticker/ticker.h"
#include "conn_internal.h"
#include "hal/ticker.h"
#include "util/mayfly.h"
#include "pdu.h"
#include "lll.h"
#include "hal/ccm.h"
#include "lll_conn.h"
#include "lll_conn_iso.h"
#include "ull_conn_types.h"
#include "ull_conn_internal.h"
#include "ull_conn_iso_types.h"
#include "ull_conn_iso_internal.h"
#include "ull_internal.h"
#include "lll_vendor.h"
#include "lll_peripheral_iso.h"
uint8_t ll_cis_accept(uint16_t handle)
{
struct ll_conn *acl_conn = NULL;
for (int h = 0; h < CONFIG_BT_MAX_CONN; h++) {
struct ll_conn *conn = ll_conn_get(h);
if (handle == conn->llcp_cis.cis_handle) {
/* ACL connection found */
acl_conn = conn;
break;
}
}
if (!acl_conn) {
BT_ERR("No connection found for handle %u", handle);
return BT_HCI_ERR_UNKNOWN_CONN_ID;
}
if (acl_conn->lll.role == BT_CONN_ROLE_MASTER) {
BT_ERR("Not allowed for central");
return BT_HCI_ERR_CMD_DISALLOWED;
}
acl_conn->llcp_cis.req++;
return 0;
}
uint8_t ll_cis_reject(uint16_t handle, uint8_t reason)
{
ARG_UNUSED(handle);
ARG_UNUSED(reason);
return BT_HCI_ERR_CMD_DISALLOWED;
}
int ull_peripheral_iso_init(void)
{
return 0;
}
int ull_peripheral_iso_reset(void)
{
return 0;
}
uint8_t ull_peripheral_iso_acquire(struct ll_conn *acl,
struct pdu_data_llctrl_cis_req *req,
uint16_t *cis_handle)
{
struct ll_conn_iso_group *cig;
struct ll_conn_iso_stream *cis;
/* Get CIG by id */
cig = ll_conn_iso_group_get_by_id(req->cig_id);
if (!cig) {
/* CIG does not exist - create it */
cig = ll_conn_iso_group_acquire();
if (!cig) {
/* No space for new CIG */
return BT_HCI_ERR_INSUFFICIENT_RESOURCES;
}
memset(&cig->lll, 0, sizeof(cig->lll));
cig->cig_id = req->cig_id;
cig->lll.handle = 0xFFFF;
cig->lll.role = acl->lll.role;
for (int i = 0; i < CONFIG_BT_CTLR_CONN_ISO_STREAMS_PER_GROUP;
i++) {
cig->cis_handles[i] = 0xFFFF;
cig->lll.cis_handles[cig->lll.num_cis] = 0xFFFF;
}
ull_hdr_init(&cig->ull);
lll_hdr_init(&cig->lll, cig);
}
if (cig->lll.num_cis == CONFIG_BT_CTLR_CONN_ISO_STREAMS_PER_GROUP) {
/* No space in CIG for new CIS */
return BT_HCI_ERR_INSUFFICIENT_RESOURCES;
}
/* Acquire new CIS */
cis = ll_conn_iso_stream_acquire();
if (cis == NULL) {
/* No space for new CIS */
return BT_HCI_ERR_INSUFFICIENT_RESOURCES;
}
cig->iso_interval = sys_le16_to_cpu(req->iso_interval);
cis->cis_id = req->cis_id;
cis->established = 0;
cis->group = cig;
cis->lll.handle = 0xFFFF;
cis->lll.acl_handle = acl->lll.handle;
cis->lll.sub_interval = sys_get_le24(req->sub_interval);
cis->lll.num_subevents = req->nse;
cis->lll.next_subevent = 0;
cis->lll.sn = 0;
cis->lll.nesn = 0;
cis->lll.cie = 0;
cis->lll.rx.phy = req->c_phy;
cis->lll.rx.burst_number = req->c_bn;
cis->lll.rx.flush_timeout = req->c_ft;
cis->lll.rx.max_octets = sys_le16_to_cpu(req->c_max_pdu);
cis->lll.tx.phy = req->p_phy;
cis->lll.tx.burst_number = req->p_bn;
cis->lll.tx.flush_timeout = req->p_ft;
cis->lll.tx.max_octets = sys_le16_to_cpu(req->p_max_pdu);
*cis_handle = ll_conn_iso_stream_handle_get(cis);
cig->lll.cis_handles[cig->lll.num_cis] = *cis_handle;
cig->cis_handles[cig->lll.num_cis] = *cis_handle;
cig->lll.num_cis++;
return 0;
}
uint8_t ull_peripheral_iso_setup(struct pdu_data_llctrl_cis_ind *ind,
uint8_t cig_id, uint16_t cis_handle)
{
struct ll_conn_iso_stream *cis = NULL;
struct ll_conn_iso_group *cig;
/* Get CIG by id */
cig = ll_conn_iso_group_get_by_id(cig_id);
if (!cig) {
return BT_HCI_ERR_UNSPECIFIED;
}
cig->lll.handle = ll_conn_iso_group_handle_get(cig);
cig->sync_delay = sys_get_le24(ind->cig_sync_delay);
/* Find CIS in CIG. NOTE: We could look up via handle, but we want to
* sanity check the CIG/CIS link.
*/
for (int i = 0; i < CONFIG_BT_CTLR_CONN_ISO_STREAMS_PER_GROUP; i++) {
if (cig->cis_handles[i] == cis_handle) {
cis = ll_conn_iso_stream_get(cig->cis_handles[i]);
break;
}
}
if (!cis) {
return BT_HCI_ERR_UNSPECIFIED;
}
cis->sync_delay = sys_get_le24(ind->cis_sync_delay);
cis->offset = sys_get_le24(ind->cis_offset);
cis->lll.event_count = -1;
memcpy(cis->lll.access_addr, ind->aa, sizeof(ind->aa));
return 0;
}
static void ticker_cb(uint32_t ticks_at_expire, uint32_t remainder,
uint16_t lazy, void *param)
{
static memq_link_t link;
static struct mayfly mfy = { 0, 0, &link, NULL,
lll_peripheral_iso_prepare };
static struct lll_prepare_param p;
struct ll_conn_iso_group *cig;
struct ll_conn_iso_stream *cis;
uint32_t err;
uint8_t ref;
cig = param;
/* Check if stopping ticker (on disconnection, race with ticker expiry)
*/
if (unlikely(cig->lll.handle == 0xFFFF)) {
return;
}
/* Increment CIS event counters */
for (int i = 0; i < cig->lll.num_cis; i++) {
cis = ll_conn_iso_stream_get(cig->cis_handles[i]);
/* New CIS may become available by creation prior to the CIG
* event in which it has event_count == 0. Don't increment
* event count until its handle is validated in
* ull_peripheral_iso_start, which means that its ACL instant
* has been reached, and offset calculated.
*/
if (cis->lll.handle != 0xFFFF) {
cis->lll.event_count++;
}
}
/* Increment prepare reference count */
ref = ull_ref_inc(&cig->ull);
LL_ASSERT(ref);
/* Append timing parameters */
p.ticks_at_expire = ticks_at_expire;
p.remainder = remainder;
p.lazy = lazy;
p.param = &cig->lll;
mfy.param = &p;
/* Kick LLL prepare */
err = mayfly_enqueue(TICKER_USER_ID_ULL_HIGH, TICKER_USER_ID_LLL,
0, &mfy);
LL_ASSERT(!err);
}
static void ticker_op_cb(uint32_t status, void *param)
{
ARG_UNUSED(param);
LL_ASSERT(status == TICKER_STATUS_SUCCESS);
}
void ull_peripheral_iso_start(struct ll_conn *acl, uint32_t ticks_at_expire)
{
struct ll_conn_iso_group *cig;
struct ll_conn_iso_stream *cis;
uint32_t acl_to_cig_ref_point;
uint32_t cis_offs_to_cig_ref;
uint32_t ready_delay_us;
uint32_t ticks_interval;
uint32_t ticker_status;
int32_t cig_offset_us;
uint16_t cis_handle;
uint8_t ticker_id;
cis_handle = acl->llcp_cis.cis_handle;
cig = ll_conn_iso_group_get_by_id(acl->llcp_cis.cig_id);
cis = ll_conn_iso_stream_get(cis_handle);
cis_offs_to_cig_ref = cig->sync_delay - cis->sync_delay;
for (int i = 0; i < cig->lll.num_cis; i++) {
uint16_t handle = cig->cis_handles[i];
/* Find valid CIS handle, but exclude incoming */
if ((handle != 0xFFFF) && (handle != cis_handle)) {
/* Ticker already started - just set the offset and
* assign LLL handle (now valid).
*/
cis->lll.offset = cis_offs_to_cig_ref;
cis->lll.handle = cis_handle;
return;
}
}
cis->lll.offset = cis_offs_to_cig_ref;
cis->lll.handle = cis_handle;
ticker_id = TICKER_ID_CONN_ISO_BASE +
ll_conn_iso_group_handle_get(cig);
ticks_interval = HAL_TICKER_US_TO_TICKS(cig->iso_interval *
CONN_INT_UNIT_US);
/* Establish the CIG reference point by adjusting ACL-to-CIS offset
* (cis->offset) by the difference between CIG- and CIS sync delays.
*/
acl_to_cig_ref_point = cis->offset - cis_offs_to_cig_ref;
#if defined(CONFIG_BT_CTLR_PHY)
ready_delay_us = lll_radio_rx_ready_delay_get(acl->lll.phy_rx, 1);
#else
ready_delay_us = lll_radio_rx_ready_delay_get(0, 0);
#endif
cig_offset_us = acl_to_cig_ref_point;
cig_offset_us -= EVENT_OVERHEAD_START_US;
cig_offset_us -= EVENT_TICKER_RES_MARGIN_US;
cig_offset_us -= EVENT_JITTER_US;
cig_offset_us -= ready_delay_us;
/* Make sure we have time to service first subevent. TODO: Improve
* by skipping <n> interval(s) and incrementing event_count.
*/
LL_ASSERT(cig_offset_us > 0);
/* Start CIS peripheral CIG ticker */
ticker_status = ticker_start(TICKER_INSTANCE_ID_CTLR,
TICKER_USER_ID_ULL_HIGH,
ticker_id,
ticks_at_expire,
HAL_TICKER_US_TO_TICKS(cig_offset_us),
ticks_interval,
HAL_TICKER_REMAINDER(ticks_interval),
TICKER_NULL_LAZY,
0,
ticker_cb, cig,
ticker_op_cb, NULL);
LL_ASSERT((ticker_status == TICKER_STATUS_SUCCESS) ||
(ticker_status == TICKER_STATUS_BUSY));
}