diff mbox series

[RFC,v4,1/5] Bluetooth: Add mgmt op set_wake_capable

Message ID 20200303170610.RFC.v4.1.I797e2f4cb824299043e771f3ab9cef86ee09f4db@changeid
State RFC
Delegated to: David Miller
Headers show
Series Bluetooth: Handle system suspend gracefully | expand

Commit Message

Abhishek Pandit-Subedi March 4, 2020, 1:06 a.m. UTC
When the system is suspended, only some connected Bluetooth devices
cause user input that should wake the system (mostly HID devices). Add
a list to keep track of devices that can wake the system and add
a management API to let userspace tell the kernel whether a device is
wake capable or not. For LE devices, the wakeable property is added to
the connection parameter and can only be modified after calling
add_device.

Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
---

Changes in v4: None
Changes in v3:
* Added wakeable property to le_conn_param
* Use wakeable list for BR/EDR and wakeable property for LE

Changes in v2: None

 include/net/bluetooth/hci_core.h |  2 ++
 include/net/bluetooth/mgmt.h     |  7 +++++
 net/bluetooth/hci_core.c         |  1 +
 net/bluetooth/mgmt.c             | 51 ++++++++++++++++++++++++++++++++
 4 files changed, 61 insertions(+)

Comments

Marcel Holtmann March 8, 2020, 8:28 a.m. UTC | #1
Hi Abhishek,

> When the system is suspended, only some connected Bluetooth devices
> cause user input that should wake the system (mostly HID devices). Add
> a list to keep track of devices that can wake the system and add
> a management API to let userspace tell the kernel whether a device is
> wake capable or not. For LE devices, the wakeable property is added to
> the connection parameter and can only be modified after calling
> add_device.
> 
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
> ---
> 
> Changes in v4: None
> Changes in v3:
> * Added wakeable property to le_conn_param
> * Use wakeable list for BR/EDR and wakeable property for LE
> 
> Changes in v2: None
> 
> include/net/bluetooth/hci_core.h |  2 ++
> include/net/bluetooth/mgmt.h     |  7 +++++
> net/bluetooth/hci_core.c         |  1 +
> net/bluetooth/mgmt.c             | 51 ++++++++++++++++++++++++++++++++
> 4 files changed, 61 insertions(+)
> 
> diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
> index dcc0dc6e2624..9d9ada5bc9d4 100644
> --- a/include/net/bluetooth/hci_core.h
> +++ b/include/net/bluetooth/hci_core.h
> @@ -394,6 +394,7 @@ struct hci_dev {
> 	struct list_head	mgmt_pending;
> 	struct list_head	blacklist;
> 	struct list_head	whitelist;
> +	struct list_head	wakeable;
> 	struct list_head	uuids;
> 	struct list_head	link_keys;
> 	struct list_head	long_term_keys;
> @@ -575,6 +576,7 @@ struct hci_conn_params {
> 
> 	struct hci_conn *conn;
> 	bool explicit_connect;
> +	bool wakeable;
> };

I do not want to commit to the mgmt API just yet. So I would prefer that the two changes above go into the respective BR/EDR and LE patches to enable this feature. And that the mgmt command comes last in this series. Then I can start applying the initial patches and we just have to discuss on how we want to expose this for blueoothd to use.

Regards

Marcel
diff mbox series

Patch

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index dcc0dc6e2624..9d9ada5bc9d4 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -394,6 +394,7 @@  struct hci_dev {
 	struct list_head	mgmt_pending;
 	struct list_head	blacklist;
 	struct list_head	whitelist;
+	struct list_head	wakeable;
 	struct list_head	uuids;
 	struct list_head	link_keys;
 	struct list_head	long_term_keys;
@@ -575,6 +576,7 @@  struct hci_conn_params {
 
 	struct hci_conn *conn;
 	bool explicit_connect;
+	bool wakeable;
 };
 
 extern struct list_head hci_dev_list;
diff --git a/include/net/bluetooth/mgmt.h b/include/net/bluetooth/mgmt.h
index f69f88e8e109..42ad5c44ad5a 100644
--- a/include/net/bluetooth/mgmt.h
+++ b/include/net/bluetooth/mgmt.h
@@ -672,6 +672,13 @@  struct mgmt_cp_set_blocked_keys {
 } __packed;
 #define MGMT_OP_SET_BLOCKED_KEYS_SIZE 2
 
+#define MGMT_OP_SET_WAKE_CAPABLE	0x0047
+#define MGMT_SET_WAKE_CAPABLE_SIZE	8
+struct mgmt_cp_set_wake_capable {
+	struct mgmt_addr_info addr;
+	u8 wake_capable;
+} __packed;
+
 #define MGMT_EV_CMD_COMPLETE		0x0001
 struct mgmt_ev_cmd_complete {
 	__le16	opcode;
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 4e6d61a95b20..b0b0308127a3 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -3299,6 +3299,7 @@  struct hci_dev *hci_alloc_dev(void)
 	INIT_LIST_HEAD(&hdev->mgmt_pending);
 	INIT_LIST_HEAD(&hdev->blacklist);
 	INIT_LIST_HEAD(&hdev->whitelist);
+	INIT_LIST_HEAD(&hdev->wakeable);
 	INIT_LIST_HEAD(&hdev->uuids);
 	INIT_LIST_HEAD(&hdev->link_keys);
 	INIT_LIST_HEAD(&hdev->long_term_keys);
diff --git a/net/bluetooth/mgmt.c b/net/bluetooth/mgmt.c
index 1002c657768a..f6751ce0d561 100644
--- a/net/bluetooth/mgmt.c
+++ b/net/bluetooth/mgmt.c
@@ -107,6 +107,7 @@  static const u16 mgmt_commands[] = {
 	MGMT_OP_READ_EXT_INFO,
 	MGMT_OP_SET_APPEARANCE,
 	MGMT_OP_SET_BLOCKED_KEYS,
+	MGMT_OP_SET_WAKE_CAPABLE,
 };
 
 static const u16 mgmt_events[] = {
@@ -4667,6 +4668,48 @@  static int set_fast_connectable(struct sock *sk, struct hci_dev *hdev,
 	return err;
 }
 
+static int set_wake_capable(struct sock *sk, struct hci_dev *hdev, void *data,
+			    u16 len)
+{
+	struct mgmt_cp_set_wake_capable *cp = data;
+	struct hci_conn_params *params;
+	int err;
+	u8 status = MGMT_STATUS_FAILED;
+	u8 addr_type = cp->addr.type == BDADDR_BREDR ?
+			       cp->addr.type :
+			       le_addr_type(cp->addr.type);
+
+	BT_DBG("Set wake capable %pMR (type 0x%x) = 0x%x\n", &cp->addr.bdaddr,
+	       addr_type, cp->wake_capable);
+
+	if (cp->addr.type == BDADDR_BREDR) {
+		if (cp->wake_capable)
+			err = hci_bdaddr_list_add(&hdev->wakeable,
+						  &cp->addr.bdaddr, addr_type);
+		else
+			err = hci_bdaddr_list_del(&hdev->wakeable,
+						  &cp->addr.bdaddr, addr_type);
+
+		if (!err || err == -EEXIST || err == -ENOENT)
+			status = MGMT_STATUS_SUCCESS;
+
+		goto done;
+	}
+
+	/* Add wakeable param to le connection parameters */
+	params = hci_conn_params_lookup(hdev, &cp->addr.bdaddr, addr_type);
+	if (params) {
+		params->wakeable = cp->wake_capable;
+		status = MGMT_STATUS_SUCCESS;
+	}
+
+done:
+	err = mgmt_cmd_complete(sk, hdev->id, MGMT_OP_SET_WAKE_CAPABLE, status,
+				cp, sizeof(*cp));
+
+	return err;
+}
+
 static void set_bredr_complete(struct hci_dev *hdev, u8 status, u16 opcode)
 {
 	struct mgmt_pending_cmd *cmd;
@@ -5795,6 +5838,13 @@  static int remove_device(struct sock *sk, struct hci_dev *hdev,
 			err = hci_bdaddr_list_del(&hdev->whitelist,
 						  &cp->addr.bdaddr,
 						  cp->addr.type);
+
+			/* Don't check result since it either succeeds or device
+			 * wasn't there (not wakeable or invalid params as
+			 * covered by deleting from whitelist).
+			 */
+			hci_bdaddr_list_del(&hdev->wakeable, &cp->addr.bdaddr,
+					    cp->addr.type);
 			if (err) {
 				err = mgmt_cmd_complete(sk, hdev->id,
 							MGMT_OP_REMOVE_DEVICE,
@@ -6994,6 +7044,7 @@  static const struct hci_mgmt_handler mgmt_handlers[] = {
 	{ set_phy_configuration,   MGMT_SET_PHY_CONFIGURATION_SIZE },
 	{ set_blocked_keys,	   MGMT_OP_SET_BLOCKED_KEYS_SIZE,
 						HCI_MGMT_VAR_LEN },
+	{ set_wake_capable,	   MGMT_SET_WAKE_CAPABLE_SIZE },
 };
 
 void mgmt_index_added(struct hci_dev *hdev)