OpenWrt – Rev 1

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--- a/arch/mips/ath79/dev-wmac.c
+++ b/arch/mips/ath79/dev-wmac.c
@@ -18,9 +18,11 @@
 #include <linux/etherdevice.h>
 #include <linux/platform_device.h>
 #include <linux/ath9k_platform.h>
+#include <linux/gpio.h>
 
 #include <asm/mach-ath79/ath79.h>
 #include <asm/mach-ath79/ar71xx_regs.h>
+#include "common.h"
 #include "dev-wmac.h"
 
 static u8 ath79_wmac_mac[ETH_ALEN];
@@ -324,6 +326,51 @@ void __init ath79_wmac_set_tx_gain_buffa
        ath79_wmac_data.tx_gain_buffalo = true;
 }
 
+static int ath79_request_ext_lna_gpio(unsigned chain, int gpio)
+{
+       char *label;
+       int err;
+
+       label = kasprintf(GFP_KERNEL, "external LNA%u", chain);
+       if (!label)
+               return -ENOMEM;
+
+       err = gpio_request_one(gpio, GPIOF_DIR_OUT | GPIOF_INIT_LOW, label);
+       if (err) {
+               pr_err("unable to request GPIO%d for external LNA%u\n",
+                       gpio, chain);
+               kfree(label);
+       }
+
+       return err;
+}
+
+static void ar934x_set_ext_lna_gpio(unsigned chain, int gpio)
+{
+       unsigned int sel;
+       int err;
+
+       if (WARN_ON(chain > 1))
+               return;
+
+       err = ath79_request_ext_lna_gpio(chain, gpio);
+       if (err)
+               return;
+
+       if (chain == 0)
+               sel = AR934X_GPIO_OUT_EXT_LNA0;
+       else
+               sel = AR934X_GPIO_OUT_EXT_LNA1;
+
+       ath79_gpio_output_select(gpio, sel);
+}
+
+void __init ath79_wmac_set_ext_lna_gpio(unsigned chain, int gpio)
+{
+       if (soc_is_ar934x())
+               ar934x_set_ext_lna_gpio(chain, gpio);
+}
+
 void __init ath79_register_wmac(u8 *cal_data, u8 *mac_addr)
 {
        if (soc_is_ar913x())
--- a/arch/mips/ath79/dev-wmac.h
+++ b/arch/mips/ath79/dev-wmac.h
@@ -17,6 +17,7 @@ void ath79_register_wmac_simple(void);
 void ath79_wmac_disable_2ghz(void);
 void ath79_wmac_disable_5ghz(void);
 void ath79_wmac_set_tx_gain_buffalo(void);
+void ath79_wmac_set_ext_lna_gpio(unsigned chain, int gpio);
 
 bool ar93xx_wmac_read_mac_address(u8 *dest);