Bluetooth: Add initial sleep support to Three-wire UART

This patch adds very basic support for the sleep related messages. The
only thing the code does right now is send a wakeup message as soon as
receiving a sleep one, essentially preventing the controller from going
to sleep.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>

1 files changed, 13 insertions, 0 deletions

diff --git a/drivers/bluetooth/hci_h5.c b/drivers/bluetooth/hci_h5.c
index eb40b9a38289..d9d42f65ee6e 100644
--- a/drivers/bluetooth/hci_h5.c
+++ b/drivers/bluetooth/hci_h5.c
@@ -74,6 +74,8 @@ struct h5 {
         bool                    tx_ack_req;     /* Pending ack to send */
         u8                      tx_seq;         /* Next seq number to send */
         u8                      tx_ack;         /* Next ack number to send */
+
+        bool                    sleeping;
 };
 
 static void h5_reset_rx(struct h5 *h5);
@@ -211,6 +213,9 @@ static void h5_handle_internal_rx(struct hci_uart *hu)
         const unsigned char sync_rsp[] = { 0x02, 0x7d };
         const unsigned char conf_req[] = { 0x03, 0xfc, 0x01 };
         const unsigned char conf_rsp[] = { 0x04, 0x7b, 0x01 };
+        const unsigned char wakeup_req[] = { 0x05, 0xfa };
+        const unsigned char woken_req[] = { 0x06, 0xf9 };
+        const unsigned char sleep_req[] = { 0x07, 0x78 };
         const unsigned char *hdr = h5->rx_skb->data;
         const unsigned char *data = &h5->rx_skb->data[4];
 
@@ -233,6 +238,14 @@ static void h5_handle_internal_rx(struct hci_uart *hu)
                 BT_DBG("Three-wire init sequence complete");
                 hci_uart_init_ready(hu);
                 return;
+        } else if (memcmp(data, sleep_req, 2) == 0) {
+                BT_DBG("Peer went to sleep");
+                h5->sleeping = true;
+                h5_link_control(hu, wakeup_req, 2);
+        } else if (memcmp(data, woken_req, 2) == 0) {
+                BT_DBG("Peer woke up");
+                h5->sleeping = false;
+                return;
         } else {
                 BT_DBG("Link Control: 0x%02hhx 0x%02hhx", data[0], data[1]);
                 return;