iwlagn: allow application own the uCode operation

Since we open the door to allow application control the device behavior through
testmode, add command to allow application request the ownership of the uCode

Signed-off-by: Wey-Yi Guy <wey-yi.w.guy@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 42 insertions, 0 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-sv-open.c b/drivers/net/wireless/iwlwifi/iwl-sv-open.c
index 653b7870adc..ed9bd91ece7 100644
--- a/drivers/net/wireless/iwlwifi/iwl-sv-open.c
+++ b/drivers/net/wireless/iwlwifi/iwl-sv-open.c
@@ -105,6 +105,7 @@ struct nla_policy iwl_testmode_gnl_msg_policy[IWL_TM_ATTR_MAX] = {
 
 	[IWL_TM_ATTR_FIXRATE] = { .type = NLA_U32, },
 
+	[IWL_TM_ATTR_UCODE_OWNER] = { .type = NLA_U8, },
 };
 
 /*
@@ -587,6 +588,42 @@ static int iwl_testmode_trace_dump(struct ieee80211_hw *hw, struct nlattr **tb,
 	return -ENOBUFS;
 }
 
+/*
+ * This function handles the user application switch ucode ownership.
+ *
+ * It retrieves the mandatory fields IWL_TM_ATTR_UCODE_OWNER and
+ * decide who the current owner of the uCode
+ *
+ * If the current owner is OWNERSHIP_TM, then the only host command
+ * can deliver to uCode is from testmode, all the other host commands
+ * will dropped.
+ *
+ * default driver is the owner of uCode in normal operational mode
+ *
+ * @hw: ieee80211_hw object that represents the device
+ * @tb: gnl message fields from the user space
+ */
+static int iwl_testmode_ownership(struct ieee80211_hw *hw, struct nlattr **tb)
+{
+	struct iwl_priv *priv = hw->priv;
+	u8 owner;
+
+	if (!tb[IWL_TM_ATTR_UCODE_OWNER]) {
+		IWL_DEBUG_INFO(priv, "Error finding ucode owner\n");
+		return -ENOMSG;
+	}
+
+	owner = nla_get_u8(tb[IWL_TM_ATTR_UCODE_OWNER]);
+	if ((owner == IWL_OWNERSHIP_DRIVER) || (owner == IWL_OWNERSHIP_TM))
+		priv->ucode_owner = owner;
+	else {
+		IWL_DEBUG_INFO(priv, "Invalid owner\n");
+		return -EINVAL;
+	}
+	return 0;
+}
+
+
 /* The testmode gnl message handler that takes the gnl message from the
  * user space and parses it per the policy iwl_testmode_gnl_msg_policy, then
  * invoke the corresponding handlers.
@@ -656,6 +693,11 @@ int iwl_testmode_cmd(struct ieee80211_hw *hw, void *data, int len)
 		result = iwl_testmode_trace(hw, tb);
 		break;
 
+	case IWL_TM_CMD_APP2DEV_OWNERSHIP:
+		IWL_DEBUG_INFO(priv, "testmode change uCode ownership\n");
+		result = iwl_testmode_ownership(hw, tb);
+		break;
+
 	default:
 		IWL_DEBUG_INFO(priv, "Unknown testmode command\n");
 		result = -ENOSYS;