[PATCH] Bluetooth: btmtksdio: add the support of wake on bluetooth

[<sean.wang@mediatek.com>]

From: Mark Chen <mark-yw.chen@mediatek.com>

Add the support to enable wake on bluetooth

Co-developed-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Sean Wang <sean.wang@mediatek.com>
Signed-off-by: Mark Chen <mark-yw.chen@mediatek.com>
---
 drivers/bluetooth/btmtk.h     |  8 ++++++++
 drivers/bluetooth/btmtksdio.c | 31 ++++++++++++++++++++++++++++++-
 2 files changed, 38 insertions(+), 1 deletion(-)

diff --git a/drivers/bluetooth/btmtk.h b/drivers/bluetooth/btmtk.h
index 6e7b0c7567c0..2be1d2680ad8 100644
--- a/drivers/bluetooth/btmtk.h
+++ b/drivers/bluetooth/btmtk.h
@@ -68,6 +68,14 @@ struct btmtk_tci_sleep {
 	u8 time_compensation;
 } __packed;
 
+struct btmtk_wakeon {
+	u8 mode;
+	u8 gpo;
+	u8 active_high;
+	__le16 enable_delay;
+	__le16 wakeup_delay;
+} __packed;
+
 struct btmtk_hci_wmt_params {
 	u8 op;
 	u8 flag;
diff --git a/drivers/bluetooth/btmtksdio.c b/drivers/bluetooth/btmtksdio.c
index d9cf0c492e29..bdd2afccc32e 100644
--- a/drivers/bluetooth/btmtksdio.c
+++ b/drivers/bluetooth/btmtksdio.c
@@ -951,6 +951,30 @@ static int btmtksdio_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 	return 0;
 }
 
+static bool btmtk_sdio_wakeup(struct hci_dev *hdev)
+{
+	struct btmtksdio_dev *bdev = hci_get_drvdata(hdev);
+	bool may_wakeup = device_may_wakeup(bdev->dev);
+	struct btmtk_wakeon bt_awake = {
+		.mode = 0x1,
+		.gpo = 0,
+		.active_high = 0x1,
+		.enable_delay = cpu_to_le16(0xc80),
+		.wakeup_delay = cpu_to_le16(0x20)
+	};
+	struct sk_buff *skb;
+
+	if (may_wakeup &&
+	    bdev->data->chipid == 0x7921) {
+		skb =  __hci_cmd_sync(hdev, 0xfc27, sizeof(bt_awake),
+				      &bt_awake, HCI_CMD_TIMEOUT);
+		if (IS_ERR(skb))
+			may_wakeup = false;
+	}
+
+	return may_wakeup;
+}
+
 static int btmtksdio_probe(struct sdio_func *func,
 			   const struct sdio_device_id *id)
 {
@@ -991,6 +1015,7 @@ static int btmtksdio_probe(struct sdio_func *func,
 	hdev->shutdown = btmtksdio_shutdown;
 	hdev->send     = btmtksdio_send_frame;
 	hdev->set_bdaddr = btmtk_set_bdaddr;
+	hdev->wakeup = btmtk_sdio_wakeup;
 
 	SET_HCIDEV_DEV(hdev, &func->dev);
 
@@ -1025,7 +1050,11 @@ static int btmtksdio_probe(struct sdio_func *func,
 	 */
 	pm_runtime_put_noidle(bdev->dev);
 
-	return 0;
+	err = device_init_wakeup(bdev->dev, true);
+	if (err)
+		bt_dev_err(hdev, "%s: failed to init_wakeup", __func__);
+
+	return err;
 }
 
 static void btmtksdio_remove(struct sdio_func *func)
-- 
2.25.1