ieee802154: atusb: implement .set_frame_retries ops callback

From firmware version 0.3 onwards we use the TX_ARET mode allowing for automatic
frame retransmissions. To actually make use of this feature we need to implement
the callback for setting the frame retries.

If the firmware version is to old print a warning and return with invalid value.
Signed-off-by: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/net/ieee802154/atusb.c

@@ -545,6 +545,21 @@ atusb_set_csma_params(struct ieee802154_hw *hw, u8 min_be, u8 max_be, u8 retries
 	return atusb_write_subreg(atusb, SR_MAX_CSMA_RETRIES, retries);
 }
 
+static int
+atusb_set_frame_retries(struct ieee802154_hw *hw, s8 retries)
+{
+	struct atusb *atusb = hw->priv;
+	struct device *dev = &atusb->usb_dev->dev;
+
+	if (atusb->fw_ver_maj == 0 && atusb->fw_ver_min < 3) {
+		dev_info(dev, "Automatic frame retransmission is only available from "
+			"firmware version 0.3. Please update if you want this feature.");
+		return -EINVAL;
+	}
+
+	return atusb_write_subreg(atusb, SR_MAX_FRAME_RETRIES, retries);
+}
+
 static int
 atusb_set_promiscuous_mode(struct ieee802154_hw *hw, const bool on)
 {
@@ -584,6 +599,7 @@ static const struct ieee802154_ops atusb_ops = {
 	.set_cca_mode		= atusb_set_cca_mode,
 	.set_cca_ed_level	= atusb_set_cca_ed_level,
 	.set_csma_params	= atusb_set_csma_params,
+	.set_frame_retries	= atusb_set_frame_retries,
 	.set_promiscuous_mode	= atusb_set_promiscuous_mode,
 };
 
@@ -754,7 +770,8 @@ static int atusb_probe(struct usb_interface *interface,
 
 	hw->parent = &usb_dev->dev;
 	hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | IEEE802154_HW_AFILT |
-		    IEEE802154_HW_PROMISCUOUS | IEEE802154_HW_CSMA_PARAMS;
+		    IEEE802154_HW_PROMISCUOUS | IEEE802154_HW_CSMA_PARAMS |
+		    IEEE802154_HW_FRAME_RETRIES;
 
 	hw->phy->flags = WPAN_PHY_FLAG_TXPOWER | WPAN_PHY_FLAG_CCA_ED_LEVEL |
 			 WPAN_PHY_FLAG_CCA_MODE;