input: touchscreen: gt1x: Reuse the original power control flow

The official driver only has vdd_ana regulator, which matches our case:
https://github.com/goodix/gt1x_driver_generic/blob/master/gt1x.c

So remove the extra regulators, and reuse the original vdd_ana.

Change-Id: Ia080344b3871e1c69b77c0f3048f601d57b8610a
Signed-off-by: Jeffy Chen <jeffy.chen@rock-chips.com>

Author: JeffyCN

drivers/input/touchscreen/gt1x/gt1x.c

@@ -31,7 +31,6 @@ static const char *input_dev_phys = "input/ts";
 #ifdef GTP_CONFIG_OF
 int gt1x_rst_gpio;
 int gt1x_int_gpio;
-struct regulator *gt1x_supply;
 #endif
 
 static int gt1x_register_powermanger(void);
@@ -293,8 +292,6 @@ static void gt1x_ts_work_func(struct work_struct *work)
 #ifdef GTP_CONFIG_OF
 
 static struct regulator *vdd_ana;
-static struct regulator *vcc_i2c;
-
 /**
  * gt1x_parse_dt - parse platform infomation form devices tree.
  */
@@ -315,23 +312,16 @@ static int gt1x_parse_dt(struct device *dev)
 		return -EINVAL;
 	}
 
-	gt1x_supply = devm_regulator_get(dev, "power");
-	if (IS_ERR(gt1x_supply)) {
-		GTP_ERROR("regulator get of power-supply failed");
-		return PTR_ERR(gt1x_supply);
+	vdd_ana = devm_regulator_get_optional(dev, "vdd_ana");
+	if (PTR_ERR(vdd_ana) == -ENODEV) {
+		GTP_ERROR("vdd_ana not specified, fallback to power-supply");
+		vdd_ana = devm_regulator_get_optional(dev, "power");
 	}
-
-	vdd_ana = devm_regulator_get(dev, "vdd_ana");
 	if (IS_ERR(vdd_ana)) {
-		GTP_ERROR("regulator get of vdd_ana failed");
-		vdd_ana = NULL;
+		GTP_ERROR("regulator get of vdd_ana/power-supply failed");
+		return PTR_ERR(vdd_ana);
 	}
 
-	vcc_i2c = devm_regulator_get(dev, "vcc_i2c");
-	if (IS_ERR(vcc_i2c)) {
-		GTP_ERROR("regulator get of vcc_i2c failed");
-		vcc_i2c = NULL;
-	}
 	return 0;
 }
 
@@ -345,18 +335,14 @@ int gt1x_power_switch(int on)
 	int ret;
 	struct i2c_client *client = gt1x_i2c_client;
 
-	if (!client || !vdd_ana || !vcc_i2c)
+	if (!client || !vdd_ana)
 		return -1;
 
 	if (on) {
 		GTP_DEBUG("GTP power on.");
 		ret = regulator_enable(vdd_ana);
-		udelay(2);
-		ret = regulator_enable(vcc_i2c);
 	} else {
 		GTP_DEBUG("GTP power off.");
-		ret = regulator_disable(vcc_i2c);
-		udelay(2);
 		ret = regulator_disable(vdd_ana);
 	}
 	return ret;
@@ -372,9 +358,6 @@ static void gt1x_remove_gpio_and_power(void)
 		gpio_free(gt1x_rst_gpio);
 
 #ifdef GTP_CONFIG_OF
-	if (vcc_i2c)
-		regulator_put(vcc_i2c);
-
 	if (vdd_ana)
 		regulator_put(vdd_ana);
 #endif

drivers/input/touchscreen/gt1x/gt1x_generic.c

@@ -944,6 +944,7 @@ static s32 gt1x_enter_sleep(void)
 	gt1x_power_switch(SWITCH_OFF);
 	return 0;
 #else
+	int ret;
 	{
 		int ret;
 		s32 retry = 0;
@@ -955,7 +956,6 @@ static s32 gt1x_enter_sleep(void)
 		while (retry++ < 3) {
 			if (!gt1x_send_cmd(GTP_CMD_SLEEP, 0)) {
 				GTP_INFO("Enter sleep mode!");
-				ret = regulator_disable(gt1x_supply);
 				if (ret < 0)
 					GTP_ERROR("disable power-supply error %d\n", ret);
 				return 0;
@@ -981,12 +981,8 @@ static s32 gt1x_wakeup_sleep(void)
 	s32 ret = -1;
 	int flag = 0;
 #endif
-	s32 ret = -1;
 	GTP_DEBUG("Wake up begin.");
 	gt1x_irq_disable();
-	ret = regulator_enable(gt1x_supply);
-	if (ret < 0)
-		GTP_ERROR("enable power-supply error: %d\n", ret);
 
 #if GTP_POWER_CTRL_SLEEP	/* power manager unit control the procedure */
 	gt1x_power_reset();