libertas: Improvements on automatic tx power control via SIOCSIWTXPOW.

iwconfig txpower can now be used to set tx power to fixed or auto. If set to
auto the default firmware settings are used.

The command CMD_802_11_PA_CFG is only sent to older firmware, as Dan Williams
noted the command was no longer supported in firmware V9+.

Signed-off-by: Anna Neal <anna@cozybit.com>
Signed-off-by: Javier Cardona <javier@cozybit.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

6 files changed, 128 insertions, 7 deletions

diff --git a/drivers/net/wireless/libertas/cmd.c b/drivers/net/wireless/libertas/cmd.c
index 802547e79671..5fef05f3cd00 100644
--- a/drivers/net/wireless/libertas/cmd.c
+++ b/drivers/net/wireless/libertas/cmd.c
@@ -1971,6 +1971,70 @@ void lbs_ps_confirm_sleep(struct lbs_private *priv)
 }
 
 
+/**
+ * @brief Configures the transmission power control functionality.
+ *
+ * @param priv          A pointer to struct lbs_private structure
+ * @param enable        Transmission power control enable
+ * @param p0            Power level when link quality is good (dBm).
+ * @param p1            Power level when link quality is fair (dBm).
+ * @param p2            Power level when link quality is poor (dBm).
+ * @param usesnr        Use Signal to Noise Ratio in TPC
+ *
+ * @return 0 on success
+ */
+int lbs_set_tpc_cfg(struct lbs_private *priv, int enable, int8_t p0, int8_t p1,
+                int8_t p2, int usesnr)
+{
+        struct cmd_ds_802_11_tpc_cfg cmd;
+        int ret;
+
+        memset(&cmd, 0, sizeof(cmd));
+        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
+        cmd.action = cpu_to_le16(CMD_ACT_SET);
+        cmd.enable = !!enable;
+        cmd.usesnr = !!enable;
+        cmd.P0 = p0;
+        cmd.P1 = p1;
+        cmd.P2 = p2;
+
+        ret = lbs_cmd_with_response(priv, CMD_802_11_TPC_CFG, &cmd);
+
+        return ret;
+}
+
+/**
+ * @brief Configures the power adaptation settings.
+ *
+ * @param priv          A pointer to struct lbs_private structure
+ * @param enable        Power adaptation enable
+ * @param p0            Power level for 1, 2, 5.5 and 11 Mbps (dBm).
+ * @param p1            Power level for 6, 9, 12, 18, 22, 24 and 36 Mbps (dBm).
+ * @param p2            Power level for 48 and 54 Mbps (dBm).
+ *
+ * @return 0 on Success
+ */
+
+int lbs_set_power_adapt_cfg(struct lbs_private *priv, int enable, int8_t p0,
+                int8_t p1, int8_t p2)
+{
+        struct cmd_ds_802_11_pa_cfg cmd;
+        int ret;
+
+        memset(&cmd, 0, sizeof(cmd));
+        cmd.hdr.size = cpu_to_le16(sizeof(cmd));
+        cmd.action = cpu_to_le16(CMD_ACT_SET);
+        cmd.enable = !!enable;
+        cmd.P0 = p0;
+        cmd.P1 = p1;
+        cmd.P2 = p2;
+
+        ret = lbs_cmd_with_response(priv, CMD_802_11_PA_CFG , &cmd);
+
+        return ret;
+}
+
+
 static struct cmd_ctrl_node *__lbs_cmd_async(struct lbs_private *priv,
         uint16_t command, struct cmd_header *in_cmd, int in_cmd_size,
         int (*callback)(struct lbs_private *, unsigned long, struct cmd_header *),
diff --git a/drivers/net/wireless/libertas/cmd.h b/drivers/net/wireless/libertas/cmd.h
index 11ac996e895e..336a181d857a 100644
--- a/drivers/net/wireless/libertas/cmd.h
+++ b/drivers/net/wireless/libertas/cmd.h
@@ -26,6 +26,12 @@ int __lbs_cmd(struct lbs_private *priv, uint16_t command,
               int (*callback)(struct lbs_private *, unsigned long, struct cmd_header *),
               unsigned long callback_arg);
 
+int lbs_set_power_adapt_cfg(struct lbs_private *priv, int enable, int8_t p0,
+                int8_t p1, int8_t p2);
+
+int lbs_set_tpc_cfg(struct lbs_private *priv, int enable, int8_t p0, int8_t p1,
+                int8_t p2, int usesnr);
+
 int lbs_cmd_copyback(struct lbs_private *priv, unsigned long extra,
                      struct cmd_header *resp);
 
diff --git a/drivers/net/wireless/libertas/defs.h b/drivers/net/wireless/libertas/defs.h
index 4b2428ac2223..c89d7a1041a8 100644
--- a/drivers/net/wireless/libertas/defs.h
+++ b/drivers/net/wireless/libertas/defs.h
@@ -189,6 +189,15 @@ static inline void lbs_deb_hex(unsigned int grp, const char *prompt, u8 *buf, in
 #define MRVDRV_CMD_UPLD_RDY             0x0008
 #define MRVDRV_CARDEVENT                0x0010
 
+
+/* Automatic TX control default levels */
+#define POW_ADAPT_DEFAULT_P0 13
+#define POW_ADAPT_DEFAULT_P1 15
+#define POW_ADAPT_DEFAULT_P2 18
+#define TPC_DEFAULT_P0 5
+#define TPC_DEFAULT_P1 10
+#define TPC_DEFAULT_P2 13
+
 /** TxPD status */
 
 /*      Station firmware use TxPD status field to report final Tx transmit
diff --git a/drivers/net/wireless/libertas/host.h b/drivers/net/wireless/libertas/host.h
index da618fc997ce..a916bb9bd5da 100644
--- a/drivers/net/wireless/libertas/host.h
+++ b/drivers/net/wireless/libertas/host.h
@@ -83,6 +83,7 @@
 #define CMD_802_11_INACTIVITY_TIMEOUT           0x0067
 #define CMD_802_11_SLEEP_PERIOD                 0x0068
 #define CMD_802_11_TPC_CFG                      0x0072
+#define CMD_802_11_PA_CFG                       0x0073
 #define CMD_802_11_FW_WAKE_METHOD               0x0074
 #define CMD_802_11_SUBSCRIBE_EVENT              0x0075
 #define CMD_802_11_RATE_ADAPT_RATESET           0x0076
diff --git a/drivers/net/wireless/libertas/hostcmd.h b/drivers/net/wireless/libertas/hostcmd.h
index d27c276b2191..630b79967560 100644
--- a/drivers/net/wireless/libertas/hostcmd.h
+++ b/drivers/net/wireless/libertas/hostcmd.h
@@ -607,14 +607,28 @@ struct cmd_ds_802_11_eeprom_access {
 } __attribute__ ((packed));
 
 struct cmd_ds_802_11_tpc_cfg {
+        struct cmd_header hdr;
+
         __le16 action;
-        u8 enable;
-        s8 P0;
-        s8 P1;
-        s8 P2;
-        u8 usesnr;
+        uint8_t enable;
+        int8_t P0;
+        int8_t P1;
+        int8_t P2;
+        uint8_t usesnr;
 } __attribute__ ((packed));
 
+
+struct cmd_ds_802_11_pa_cfg {
+        struct cmd_header hdr;
+
+        __le16 action;
+        uint8_t enable;
+        int8_t P0;
+        int8_t P1;
+        int8_t P2;
+} __attribute__ ((packed));
+
+
 struct cmd_ds_802_11_led_ctrl {
         __le16 action;
         __le16 numled;
diff --git a/drivers/net/wireless/libertas/wext.c b/drivers/net/wireless/libertas/wext.c
index 426f1fe3bb42..e8cadad2c863 100644
--- a/drivers/net/wireless/libertas/wext.c
+++ b/drivers/net/wireless/libertas/wext.c
@@ -1820,7 +1820,21 @@ static int lbs_set_txpow(struct net_device *dev, struct iw_request_info *info,
         }
 
         if (vwrq->fixed == 0) {
-                /* Auto power control */
+                /* User requests automatic tx power control, however there are
+                 * many auto tx settings.  For now use firmware defaults until
+                 * we come up with a good way to expose these to the user. */
+                if (priv->fwrelease < 0x09000000) {
+                        ret = lbs_set_power_adapt_cfg(priv, 1,
+                                        POW_ADAPT_DEFAULT_P0,
+                                        POW_ADAPT_DEFAULT_P1,
+                                        POW_ADAPT_DEFAULT_P2);
+                        if (ret)
+                                goto out;
+                }
+                ret = lbs_set_tpc_cfg(priv, 0, TPC_DEFAULT_P0, TPC_DEFAULT_P1,
+                                TPC_DEFAULT_P2, 1);
+                if (ret)
+                        goto out;
                 dbm = priv->txpower_max;
         } else {
                 /* Userspace check in iwrange if it should use dBm or mW,
@@ -1830,7 +1844,8 @@ static int lbs_set_txpow(struct net_device *dev, struct iw_request_info *info,
                         goto out;
                 }
 
-                /* Validate requested power level against firmware allowed levels */
+                /* Validate requested power level against firmware allowed
+                 * levels */
                 if (priv->txpower_min && (dbm < priv->txpower_min)) {
                         ret = -EINVAL;
                         goto out;
@@ -1840,6 +1855,18 @@ static int lbs_set_txpow(struct net_device *dev, struct iw_request_info *info,
                         ret = -EINVAL;
                         goto out;
                 }
+                if (priv->fwrelease < 0x09000000) {
+                        ret = lbs_set_power_adapt_cfg(priv, 0,
+                                        POW_ADAPT_DEFAULT_P0,
+                                        POW_ADAPT_DEFAULT_P1,
+                                        POW_ADAPT_DEFAULT_P2);
+                        if (ret)
+                                goto out;
+                }
+                ret = lbs_set_tpc_cfg(priv, 0, TPC_DEFAULT_P0, TPC_DEFAULT_P1,
+                                TPC_DEFAULT_P2, 1);
+                if (ret)
+                        goto out;
         }
 
         /* If the radio was off, turn it on */