ath9k_htc: Implement multiple register write support

This patch adds support for writing multiple registers
in a single USB command.

Specific calls from the HW code that performs multiple
register writes would be modified to make use of this
in subsequent patches.

Signed-off-by: Sujith <Sujith.Manoharan@atheros.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/drivers/net/wireless/ath/ath9k/wmi.h b/drivers/net/wireless/ath/ath9k/wmi.h
index 39ef926f27c2..fd8c9c5f4a05 100644
--- a/drivers/net/wireless/ath/ath9k/wmi.h
+++ b/drivers/net/wireless/ath/ath9k/wmi.h
@@ -84,6 +84,13 @@ enum wmi_event_id {
         WMI_TXRATE_EVENTID,
 };
 
+#define MAX_CMD_NUMBER 62
+
+struct register_write {
+        u32 reg;
+        u32 val;
+};
+
 struct wmi {
         struct ath9k_htc_priv *drv_priv;
         struct htc_target *htc;
@@ -97,6 +104,11 @@ struct wmi {
 
         struct sk_buff *wmi_skb;
         spinlock_t wmi_lock;
+
+        atomic_t mwrite_cnt;
+        struct register_write multi_write[MAX_CMD_NUMBER];
+        u32 multi_write_idx;
+        struct mutex multi_write_mutex;
 };
 
 struct wmi *ath9k_init_wmi(struct ath9k_htc_priv *priv);