mrf24j40: add promiscuous mode support

This patch adds support for promiscuous mode by setting promiscuous (no
frame filtering), disable automatic ack handling and not filtering
frames where the crc is invalid.
Reviewed-by: Stefan Schmidt <stefan@osg.samsung.com>
Signed-off-by: Alexander Aring <alex.aring@gmail.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>

drivers/net/ieee802154/mrf24j40.c

@@ -923,6 +923,24 @@ static int mrf24j40_set_txpower(struct ieee802154_hw *hw, s32 mbm)
 	return regmap_update_bits(devrec->regmap_long, REG_RFCON3, 0xf8, val);
 }
 
+static int mrf24j40_set_promiscuous_mode(struct ieee802154_hw *hw, bool on)
+{
+	struct mrf24j40 *devrec = hw->priv;
+	int ret;
+
+	if (on) {
+		/* set PROMI, ERRPKT and NOACKRSP */
+		ret = regmap_update_bits(devrec->regmap_short, REG_RXMCR, 0x23,
+					 0x23);
+	} else {
+		/* clear PROMI, ERRPKT and NOACKRSP */
+		ret = regmap_update_bits(devrec->regmap_short, REG_RXMCR, 0x23,
+					 0x00);
+	}
+
+	return ret;
+}
+
 static const struct ieee802154_ops mrf24j40_ops = {
 	.owner = THIS_MODULE,
 	.xmit_async = mrf24j40_tx,
@@ -935,6 +953,7 @@ static const struct ieee802154_ops mrf24j40_ops = {
 	.set_cca_mode = mrf24j40_set_cca_mode,
 	.set_cca_ed_level = mrf24j40_set_cca_ed_level,
 	.set_txpower = mrf24j40_set_txpower,
+	.set_promiscuous_mode = mrf24j40_set_promiscuous_mode,
 };
 
 static void mrf24j40_intstat_complete(void *context)
@@ -1182,7 +1201,8 @@ static int mrf24j40_probe(struct spi_device *spi)
 	devrec->hw->parent = &spi->dev;
 	devrec->hw->phy->supported.channels[0] = CHANNEL_MASK;
 	devrec->hw->flags = IEEE802154_HW_TX_OMIT_CKSUM | IEEE802154_HW_AFILT |
-			    IEEE802154_HW_CSMA_PARAMS;
+			    IEEE802154_HW_CSMA_PARAMS |
+			    IEEE802154_HW_PROMISCUOUS;
 
 	devrec->hw->phy->flags = WPAN_PHY_FLAG_CCA_MODE |
 				 WPAN_PHY_FLAG_CCA_ED_LEVEL;