[RFCv0 04/19] Bluetooth: General HCI callback implementation

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From: Andrei Emeltchenko <andrei.emeltchenko@xxxxxxxxx>

Add general HCI callback implementation. Can be used for executing
HCI commands from A2MP protocol.

Signed-off-by: Andrei Emeltchenko <andrei.emeltchenko@xxxxxxxxx>
---
 include/net/bluetooth/hci_core.h |   21 +++++++++
 net/bluetooth/hci_core.c         |   88 ++++++++++++++++++++++++++++++++++++++
 2 files changed, 109 insertions(+)

diff --git a/include/net/bluetooth/hci_core.h b/include/net/bluetooth/hci_core.h
index 4f7c866..55b89d1 100644
--- a/include/net/bluetooth/hci_core.h
+++ b/include/net/bluetooth/hci_core.h
@@ -130,6 +130,17 @@ struct le_scan_params {
 
 #define HCI_MAX_SHORT_NAME_LENGTH	10
 
+struct hci_dev;
+
+struct hci_cb_cmd {
+	struct list_head list;
+	u16 opcode;
+	u8 status;
+	void *opt;
+	void (*cb)(struct hci_dev *hdev, struct hci_cb_cmd *cmd);
+	void (*destructor)(struct hci_dev *hdev, struct hci_cb_cmd *cmd);
+};
+
 #define NUM_REASSEMBLY 4
 struct hci_dev {
 	struct list_head list;
@@ -242,6 +253,9 @@ struct hci_dev {
 
 	struct list_head	mgmt_pending;
 
+	struct mutex		cb_list_lock;
+	struct list_head	cb_list;
+
 	struct discovery_state	discovery;
 	struct hci_conn_hash	conn_hash;
 	struct list_head	blacklist;
@@ -1094,5 +1108,12 @@ int hci_le_scan(struct hci_dev *hdev, u8 type, u16 interval, u16 window,
 int hci_cancel_le_scan(struct hci_dev *hdev);
 
 u8 bdaddr_to_le(u8 bdaddr_type);
+struct hci_cb_cmd *hci_find_cb(struct hci_dev *hdev, __u16 opcode);
+int hci_cmd_cb(struct hci_dev *hdev, __u16 opcode, __u32 plen, void *param,
+	       void (*cb)(struct hci_dev *hdev, struct hci_cb_cmd *cmd),
+	       void *opt,
+	       void (*destructor)(struct hci_dev *hdev, struct hci_cb_cmd *cmd),
+	       gfp_t flags);
+void hci_remove_cb(struct hci_dev *hdev, struct hci_cb_cmd *cmd);
 
 #endif /* __HCI_CORE_H */
diff --git a/net/bluetooth/hci_core.c b/net/bluetooth/hci_core.c
index 5ad508e..e3cca20 100644
--- a/net/bluetooth/hci_core.c
+++ b/net/bluetooth/hci_core.c
@@ -36,6 +36,7 @@
 static void hci_rx_work(struct work_struct *work);
 static void hci_cmd_work(struct work_struct *work);
 static void hci_tx_work(struct work_struct *work);
+static void hci_cb_clear(struct hci_dev *hdev);
 
 /* HCI device list */
 LIST_HEAD(hci_dev_list);
@@ -1645,6 +1646,7 @@ struct hci_dev *hci_alloc_dev(void)
 
 	mutex_init(&hdev->lock);
 	mutex_init(&hdev->req_lock);
+	mutex_init(&hdev->cb_list_lock);
 
 	INIT_LIST_HEAD(&hdev->mgmt_pending);
 	INIT_LIST_HEAD(&hdev->blacklist);
@@ -1652,6 +1654,7 @@ struct hci_dev *hci_alloc_dev(void)
 	INIT_LIST_HEAD(&hdev->link_keys);
 	INIT_LIST_HEAD(&hdev->long_term_keys);
 	INIT_LIST_HEAD(&hdev->remote_oob_data);
+	INIT_LIST_HEAD(&hdev->cb_list);
 
 	INIT_WORK(&hdev->rx_work, hci_rx_work);
 	INIT_WORK(&hdev->cmd_work, hci_cmd_work);
@@ -1817,6 +1820,7 @@ void hci_unregister_dev(struct hci_dev *hdev)
 	hci_link_keys_clear(hdev);
 	hci_smp_ltks_clear(hdev);
 	hci_remote_oob_data_clear(hdev);
+	hci_cb_clear(hdev);
 	hci_dev_unlock(hdev);
 
 	hci_dev_put(hdev);
@@ -2118,6 +2122,90 @@ int hci_send_cmd(struct hci_dev *hdev, __u16 opcode, __u32 plen, void *param)
 	return 0;
 }
 
+static int hci_add_cb(struct hci_dev *hdev, __u16 opcode,
+		      void (*cb)(struct hci_dev *hdev, struct hci_cb_cmd *cmd),
+		      void *opt,
+		      void (*destructor)(struct hci_dev *hdev,
+					 struct hci_cb_cmd *cmd),
+		      gfp_t flags)
+{
+	struct hci_cb_cmd *cmd;
+
+	cmd = kmalloc(sizeof(*cmd), flags);
+	if (!cmd)
+		return -ENOMEM;
+
+	cmd->cb = cb;
+	cmd->opcode = opcode;
+	cmd->opt = opt;
+	cmd->status = 0;
+	cmd->destructor = destructor;
+
+	mutex_lock(&hdev->cb_list_lock);
+	list_add(&cmd->list, &hdev->cb_list);
+	mutex_unlock(&hdev->cb_list_lock);
+
+	return 0;
+}
+
+struct hci_cb_cmd *hci_find_cb(struct hci_dev *hdev, __u16 opcode)
+{
+	struct hci_cb_cmd *cmd;
+
+	mutex_lock(&hdev->cb_list_lock);
+	list_for_each_entry(cmd, &hdev->cb_list, list)
+		if (cmd->opcode == opcode) {
+			mutex_unlock(&hdev->cb_list_lock);
+			return cmd;
+		}
+	mutex_unlock(&hdev->cb_list_lock);
+
+	return NULL;
+}
+
+void hci_remove_cb(struct hci_dev *hdev, struct hci_cb_cmd *cmd)
+{
+	BT_DBG("%s: remove cmd %p", hdev->name, cmd);
+
+	mutex_lock(&hdev->cb_list_lock);
+	list_del(&cmd->list);
+	mutex_unlock(&hdev->cb_list_lock);
+
+	if (cmd->destructor) {
+		cmd->destructor(hdev, cmd);
+	} else {
+		kfree(cmd->opt);
+		kfree(cmd);
+	}
+}
+
+static void hci_cb_clear(struct hci_dev *hdev)
+{
+	struct hci_cb_cmd *cmd, *tmp;
+
+	list_for_each_entry_safe(cmd, tmp, &hdev->cb_list, list)
+		hci_remove_cb(hdev, cmd);
+}
+
+/* Send HCI command with callback */
+int hci_cmd_cb(struct hci_dev *hdev, __u16 opcode, __u32 plen, void *param,
+	       void (*cb)(struct hci_dev *hdev, struct hci_cb_cmd *cmd),
+	       void *opt,
+	       void (*destructor)(struct hci_dev *hdev, struct hci_cb_cmd *cmd),
+	       gfp_t flags)
+{
+	int ret;
+
+	if (!cb)
+		return -EINVAL;
+
+	ret = hci_add_cb(hdev, opcode, cb, opt, destructor, flags);
+	if (ret)
+		return ret;
+
+	return hci_send_cmd(hdev, opcode, plen, param);
+}
+
 /* Get data from the previously sent command */
 void *hci_sent_cmd_data(struct hci_dev *hdev, __u16 opcode)
 {
-- 
1.7.9.5

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