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Bluetooth: Query LE tx power on startup 

Queries tx power via HCI_LE_Read_Transmit_Power command when the hci
device is initialized, and stores resulting min/max LE power in hdev
struct. If command isn't available (< BT5 support), min/max values
both default to HCI_TX_POWER_INVALID.

This patch is manually verified by ensuring BT5 devices correctly query
and receive controller tx power range.

Reviewed-by: Sonny Sasaka <sonnysasaka@chromium.org>
Signed-off-by: Daniel Winkler <danielwinkler@google.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Daniel Winkler 2020-12-03 12:12:51 -08:00 committed by Johan Hedberg
parent 9bf9f4b630
commit 7c395ea521
4 changed files with 35 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
include/net/bluetooth/hci.h
View File

@ -1797,6 +1797,13 @@ struct hci_cp_le_set_adv_set_rand_addr {
bdaddr_t bdaddr;
} __packed;
#define HCI_OP_LE_READ_TRANSMIT_POWER 0x204b
struct hci_rp_le_read_transmit_power {
__u8 status;
__s8 min_le_tx_power;
__s8 max_le_tx_power;
} __packed;
#define HCI_OP_LE_READ_BUFFER_SIZE_V2 0x2060
struct hci_rp_le_read_buffer_size_v2 {
__u8 status;

2
include/net/bluetooth/hci_core.h
View File

@ -384,6 +384,8 @@ struct hci_dev {
__u16 def_page_timeout;
__u16 def_multi_adv_rotation_duration;
__u16 def_le_autoconnect_timeout;
__s8 min_le_tx_power;
__s8 max_le_tx_power;
__u16 pkt_type;
__u16 esco_type;

8
net/bluetooth/hci_core.c
View File

@ -741,6 +741,12 @@ static int hci_init3_req(struct hci_request *req, unsigned long opt)
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,
@ -3660,6 +3666,8 @@ struct hci_dev *hci_alloc_dev(void)
hdev->le_num_of_adv_sets = HCI_MAX_ADV_INSTANCES;
hdev->def_multi_adv_rotation_duration = HCI_DEFAULT_ADV_DURATION;
hdev->def_le_autoconnect_timeout = HCI_LE_AUTOCONN_TIMEOUT;
hdev->min_le_tx_power = HCI_TX_POWER_INVALID;
hdev->max_le_tx_power = HCI_TX_POWER_INVALID;
hdev->rpa_timeout = HCI_DEFAULT_RPA_TIMEOUT;
hdev->discov_interleaved_timeout = DISCOV_INTERLEAVED_TIMEOUT;

18
net/bluetooth/hci_event.c
View File

@ -1202,6 +1202,20 @@ static void hci_cc_le_set_adv_set_random_addr(struct hci_dev *hdev,
hci_dev_unlock(hdev);
}
static void hci_cc_le_read_transmit_power(struct hci_dev *hdev,
struct sk_buff *skb)
{
struct hci_rp_le_read_transmit_power *rp = (void *)skb->data;
BT_DBG("%s status 0x%2.2x", hdev->name, rp->status);
if (rp->status)
return;
hdev->min_le_tx_power = rp->min_le_tx_power;
hdev->max_le_tx_power = rp->max_le_tx_power;
}
static void hci_cc_le_set_adv_enable(struct hci_dev *hdev, struct sk_buff *skb)
{
__u8 *sent, status = *((__u8 *) skb->data);
@ -3582,6 +3596,10 @@ static void hci_cmd_complete_evt(struct hci_dev *hdev, struct sk_buff *skb,
hci_cc_le_set_adv_set_random_addr(hdev, skb);
break;
case HCI_OP_LE_READ_TRANSMIT_POWER:
hci_cc_le_read_transmit_power(hdev, skb);
break;
default:
BT_DBG("%s opcode 0x%4.4x", hdev->name, *opcode);
break;