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Bluetooth: host: Introduce a new bt_hci_le_rand() call

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In order to get rid of the duplication of the code that we had until now
in the tree, consolidate the handling of multiple calls to
bt_hci_cmd_send_sync(BT_HCI_OP_LE_RAND, ...) in a single location,
namely in hci_core.

This allows all of the users of this HCI command to use a single
implementation of the iterated sending of the HCI command to fill a
buffer with random bytes.

Signed-off-by: Carles Cufi <carles.cufi@nordicsemi.no>
This commit is contained in:
Carles Cufi 2022-03-31 18:52:47 +02:00 • committed by Carles Cufí
commit 00636682ca
4 changed files with 56 additions and 82 deletions
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22
drivers/entropy/entropy_bt_hci.c
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@ -20,31 +20,11 @@ static int entropy_bt_init(const struct device *dev)
static int entropy_bt_get_entropy(const struct device *dev,
uint8_t *buffer, uint16_t length)
{
struct bt_hci_rp_le_rand *rp;
struct net_buf *rsp;
int req, ret;
if (!bt_is_ready()) {
return -EAGAIN;
}
while (length > 0) {
/* Number of bytes to fill on this iteration */
req = MIN(length, sizeof(rp->rand));
/* Request the next 8 bytes over HCI */
ret = bt_hci_cmd_send_sync(BT_HCI_OP_LE_RAND, NULL, &rsp);
if (ret) {
return ret;
}
/* Copy random data into buffer */
rp = (void *)rsp->data;
memcpy(buffer, rp->rand, req);
net_buf_unref(rsp);
buffer += req;
length -= req;
}
return 0;
return bt_hci_le_rand(buffer, length);
}
/* HCI commands cannot be run from an interrupt context */