iwlwifi: enable communication with WoWLAN firmware

On resuming, the opmode may have to be able to talk
to the WoWLAN/D3 firmware in order to query it about
its status and wakeup reasons. To do that, the opmode
has to call the new d3_resume() transport API which
will set up the device for command communcation.

Reviewed-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 25 insertions, 4 deletions

diff --git a/drivers/net/wireless/iwlwifi/iwl-trans.h b/drivers/net/wireless/iwlwifi/iwl-trans.h
index 55a140ade5a7..0f85eb305878 100644
--- a/drivers/net/wireless/iwlwifi/iwl-trans.h
+++ b/drivers/net/wireless/iwlwifi/iwl-trans.h
@@ -308,6 +308,16 @@ static inline struct page *rxb_steal_page(struct iwl_rx_cmd_buffer *r)
 #define IWL_FRAME_LIMIT 64
 
 /**
+ * enum iwl_wowlan_status - WoWLAN image/device status
+ * @IWL_D3_STATUS_ALIVE: firmware is still running after resume
+ * @IWL_D3_STATUS_RESET: device was reset while suspended
+ */
+enum iwl_d3_status {
+        IWL_D3_STATUS_ALIVE,
+        IWL_D3_STATUS_RESET,
+};
+
+/**
  * struct iwl_trans_config - transport configuration
  *
  * @op_mode: pointer to the upper layer.
@@ -363,9 +373,12 @@ struct iwl_trans;
  *      May sleep
  * @stop_device:stops the whole device (embedded CPU put to reset)
  *      May sleep
- * @wowlan_suspend: put the device into the correct mode for WoWLAN during
+ * @d3_suspend: put the device into the correct mode for WoWLAN during
  *      suspend. This is optional, if not implemented WoWLAN will not be
  *      supported. This callback may sleep.
+ * @d3_resume: resume the device after WoWLAN, enabling the opmode to
+ *      talk to the WoWLAN image to get its status. This is optional, if not
+ *      implemented WoWLAN will not be supported. This callback may sleep.
  * @send_cmd:send a host command. Must return -ERFKILL if RFkill is asserted.
  *      If RFkill is asserted in the middle of a SYNC host command, it must
  *      return -ERFKILL straight away.
@@ -409,7 +422,8 @@ struct iwl_trans_ops {
         void (*fw_alive)(struct iwl_trans *trans, u32 scd_addr);
         void (*stop_device)(struct iwl_trans *trans);
 
-        void (*wowlan_suspend)(struct iwl_trans *trans);
+        void (*d3_suspend)(struct iwl_trans *trans);
+        int (*d3_resume)(struct iwl_trans *trans, enum iwl_d3_status *status);
 
         int (*send_cmd)(struct iwl_trans *trans, struct iwl_host_cmd *cmd);
 
@@ -562,10 +576,17 @@ static inline void iwl_trans_stop_device(struct iwl_trans *trans)
         trans->state = IWL_TRANS_NO_FW;
 }
 
-static inline void iwl_trans_wowlan_suspend(struct iwl_trans *trans)
+static inline void iwl_trans_d3_suspend(struct iwl_trans *trans)
+{
+        might_sleep();
+        trans->ops->d3_suspend(trans);
+}
+
+static inline int iwl_trans_d3_resume(struct iwl_trans *trans,
+                                      enum iwl_d3_status *status)
 {
         might_sleep();
-        trans->ops->wowlan_suspend(trans);
+        return trans->ops->d3_resume(trans, status);
 }
 
 static inline int iwl_trans_send_cmd(struct iwl_trans *trans,