wlan: Set BATFET to NPM when wifi is on

PMIC has a voltage drop problem in suspend when BATFET is LPM(low power mode).
To avoid this issue, set BATFET to NPM(Normal power mode) only when wifi is on.
The current will be increased by about 0.2mA when wifi is on.

Change-Id: I3e9776d2ecf699faca9a415957f1883dff0bc2c4
Signed-off-by: Zheng Guolin <zhengguolin@huawei.com>

arch/arm/mach-msm/board-8026-wifi.c

@@ -11,6 +11,7 @@
 #include <linux/ctype.h>
 #include <linux/proc_fs.h>
 #include <linux/uaccess.h>
+#include <linux/regulator/consumer.h>
 
 #define GPIO_WL_HOST_WAKE 66
 #define GPIO_WL_REG_ON 110
@@ -21,6 +22,7 @@
 #define ETHER_STR_LEN 12
 #define ETHER_BUFFER_LEN 16
 
+static int power_enabled = 0;
 char g_wlan_ether_addr[] = {0x00,0x00,0x00,0x00,0x00,0x00};
 
 typedef enum
@@ -201,27 +203,51 @@ int __init brcm_wifi_init_gpio(void)
 
 static int brcm_wlan_power(int onoff)
 {
-	printk(KERN_INFO"------------------------------------------------");
-	printk(KERN_INFO"------------------------------------------------\n");
+	static struct regulator *reg_batfet = NULL;
+	int ret = 0;
+
 	printk(KERN_INFO"%s Enter: power %s\n", __func__, onoff ? "on" : "off");
+
+	if (!reg_batfet) {
+		reg_batfet = regulator_get(NULL, "batfet");
+		if (IS_ERR(reg_batfet)) {
+			pr_warn("%s: failed to get regualtor(batfet)\n",
+						__func__);
+			reg_batfet = NULL;
+		}
+	}
+
+	onoff = !!onoff;
+	if (!(power_enabled ^ onoff)) {
+		printk(KERN_INFO"%s: power already %s\n", __func__, onoff ? "on" : "off");
+		return 0;
+	}
+
 	if (onoff) {
-		/*
-		if (gpio_request(GPIO_WL_REG_ON, "WL_REG_ON"))
-		{
-			printk("Failed to request for WL_REG_ON\n");
-		}*/
 		if (gpio_direction_output(GPIO_WL_REG_ON, 1)) {
 			printk(KERN_ERR "%s: WL_REG_ON  failed to pull up\n",
 				__func__);
 			return -EIO;
 		}
+
+		power_enabled = 1;
+
+		if (reg_batfet) {
+			ret = regulator_enable(reg_batfet);
+			if (ret)
+			pr_warn("%s: failed to enable regulator(batfet)\n",
+						__func__);
+		}
 	} else {
-		/*
-		if (gpio_request(GPIO_WL_REG_ON, "WL_REG_ON"))
-		{
-			printk("Failed to request for WL_REG_ON\n");
+		power_enabled = 0;
+
+		if (reg_batfet) {
+			ret = regulator_disable(reg_batfet);
+			if (ret)
+				pr_warn("%s: failed to disable regulator(batfet)\n",
+						__func__);
 			}
-		*/
+
 		if (gpio_direction_output(GPIO_WL_REG_ON, 0)) {
 			printk(KERN_ERR "%s: WL_REG_ON  failed to pull down\n",
 				__func__);