iwlwifi: send cmd to uCode to configure valid tx antenna

In order for uCode to select the valid antennas for transmit, driver
need to configure the allowed tx antennas through host command.

The TX_ANT_CONFIGURATION_CMD should be used for 5000 series and up
Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

drivers/net/wireless/iwlwifi/iwl-5000.c

@@ -1450,6 +1450,24 @@ int iwl5000_calc_rssi(struct iwl_priv *priv,
 	return max_rssi - agc - IWL49_RSSI_OFFSET;
 }
 
+static int iwl5000_send_tx_ant_config(struct iwl_priv *priv, u8 valid_tx_ant)
+{
+	struct iwl_tx_ant_config_cmd tx_ant_cmd = {
+	  .valid = cpu_to_le32(valid_tx_ant),
+	};
+
+	if (IWL_UCODE_API(priv->ucode_ver) > 1) {
+		IWL_DEBUG_HC(priv, "select valid tx ant: %u\n", valid_tx_ant);
+		return iwl_send_cmd_pdu(priv, TX_ANT_CONFIGURATION_CMD,
+					sizeof(struct iwl_tx_ant_config_cmd),
+					&tx_ant_cmd);
+	} else {
+		IWL_DEBUG_HC(priv, "TX_ANT_CONFIGURATION_CMD not supported\n");
+		return -EOPNOTSUPP;
+	}
+}
+
+
 #define IWL5000_UCODE_GET(item)						\
 static u32 iwl5000_ucode_get_##item(const struct iwl_ucode_header *ucode,\
 				    u32 api_ver)			\
@@ -1492,6 +1510,7 @@ struct iwl_hcmd_ops iwl5000_hcmd = {
 	.rxon_assoc = iwl5000_send_rxon_assoc,
 	.commit_rxon = iwl_commit_rxon,
 	.set_rxon_chain = iwl_set_rxon_chain,
+	.set_tx_ant = iwl5000_send_tx_ant_config,
 };
 
 struct iwl_hcmd_utils_ops iwl5000_hcmd_utils = {

drivers/net/wireless/iwlwifi/iwl-agn.c

@@ -1762,6 +1762,10 @@ static void iwl_alive_start(struct iwl_priv *priv)
 	priv->active_rate = priv->rates_mask;
 	priv->active_rate_basic = priv->rates_mask & IWL_BASIC_RATES_MASK;
 
+	/* Configure Tx antenna selection based on H/W config */
+	if (priv->cfg->ops->hcmd->set_tx_ant)
+		priv->cfg->ops->hcmd->set_tx_ant(priv, priv->cfg->valid_tx_ant);
+
 	if (iwl_is_associated(priv)) {
 		struct iwl_rxon_cmd *active_rxon =
 				(struct iwl_rxon_cmd *)&priv->active_rxon;

drivers/net/wireless/iwlwifi/iwl-commands.h

@@ -148,7 +148,7 @@ enum {
 	QUIET_NOTIFICATION = 0x96,		/* not used */
 	REPLY_TX_PWR_TABLE_CMD = 0x97,
 	REPLY_TX_POWER_DBM_CMD_V1 = 0x98,	/* old version of API */
-	TX_ANT_CONFIGURATION_CMD = 0x98,	/* not used */
+	TX_ANT_CONFIGURATION_CMD = 0x98,
 	MEASURE_ABORT_NOTIFICATION = 0x99,	/* not used */
 
 	/* Bluetooth device coexistence config command */
@@ -411,6 +411,16 @@ struct iwl5000_tx_power_dbm_cmd {
 	u8 reserved;
 } __attribute__ ((packed));
 
+/**
+ * Command TX_ANT_CONFIGURATION_CMD = 0x98
+ * This command is used to configure valid Tx antenna.
+ * By default uCode concludes the valid antenna according to the radio flavor.
+ * This command enables the driver to override/modify this conclusion.
+ */
+struct iwl_tx_ant_config_cmd {
+	__le32 valid;
+} __attribute__ ((packed));
+
 /******************************************************************************
  * (0a)
  * Alive and Error Commands & Responses:

drivers/net/wireless/iwlwifi/iwl-core.h

@@ -89,6 +89,7 @@ struct iwl_hcmd_ops {
 	int (*rxon_assoc)(struct iwl_priv *priv);
 	int (*commit_rxon)(struct iwl_priv *priv);
 	void (*set_rxon_chain)(struct iwl_priv *priv);
+	int (*set_tx_ant)(struct iwl_priv *priv, u8 valid_tx_ant);
 };
 
 struct iwl_hcmd_utils_ops {