linux-kernel - [PATCH 3/7] leds-lm3530: add 'is_vin_always_on' in the lm3530_platform

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Date:	Thu, 19 Jan 2012 17:48:24 -0800
From:	"Kim, Milo" <Milo.Kim@...com>
To:	"Linus Walleij" <linus.walleij@...aro.org>,
	"shreshthakumar.sahu@...ricsson.com" 
	<shreshthakumar.sahu@...ricsson.com>
cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"rpurdie@...ys.net" <rpurdie@...ys.net>
Subject: [PATCH 3/7] leds-lm3530: add 'is_vin_always_on' in the
 lm3530_platform_data

The 'IN' pin(Input voltage connection) can be always turned on
in case it is connected with VBATT.
To support this case, 'is_vin_always_on' is added.
If VIN is always on, then we don't need to control the regulator for IN pin.

Signed-off-by: Milo(Woogyom) Kim <milo.kim@...com>

diff --git a/drivers/leds/leds-lm3530.c b/drivers/leds/leds-lm3530.c
index 963a1db..ba2bb7e 100644
--- a/drivers/leds/leds-lm3530.c
+++ b/drivers/leds/leds-lm3530.c
@@ -200,7 +200,7 @@ static int lm3530_init_registers(struct lm3530_data *drvdata)
 	reg_val[13] = LM3530_DEF_ZT_3;	/* LM3530_ALS_Z3T_REG */
 	reg_val[14] = LM3530_DEF_ZT_4;	/* LM3530_ALS_Z4T_REG */
 
-	if (!drvdata->enable) {
+	if (!drvdata->enable && !pltfm->is_vin_always_on) {
 		ret = regulator_enable(drvdata->regulator);
 		if (ret) {
 			dev_err(&drvdata->client->dev,
@@ -256,7 +256,7 @@ static void lm3530_brightness_set(struct led_classdev *led_cdev,
 		else
 			drvdata->brightness = brt_val / 2;
 
-		if (brt_val == 0) {
+		if (brt_val == 0 && !pdata->is_vin_always_on) {
 			err = regulator_disable(drvdata->regulator);
 			if (err)
 				dev_err(&drvdata->client->dev,
@@ -340,18 +340,20 @@ static int __devinit lm3530_probe(struct i2c_client *client,
 	drvdata->client = client;
 	drvdata->pdata = pdata;
 	drvdata->brightness = LED_OFF;
-	drvdata->enable = false;
+	drvdata->enable = pdata->is_vin_always_on;
 	drvdata->led_dev.name = pdata->name ? pdata->name : LM3530_LED_DEV;
 	drvdata->led_dev.brightness_set = lm3530_brightness_set;
 
 	i2c_set_clientdata(client, drvdata);
 
-	drvdata->regulator = regulator_get(&client->dev, "vin");
-	if (IS_ERR(drvdata->regulator)) {
-		dev_err(&client->dev, "regulator get failed\n");
-		err = PTR_ERR(drvdata->regulator);
-		drvdata->regulator = NULL;
-		goto err_regulator_get;
+	if (!drvdata->enable) {
+		drvdata->regulator = regulator_get(&client->dev, "vin");
+		if (IS_ERR(drvdata->regulator)) {
+			dev_err(&client->dev, "regulator get failed\n");
+			err = PTR_ERR(drvdata->regulator);
+			drvdata->regulator = NULL;
+			goto err_regulator_get;
+		}
 	}
 
 	if (drvdata->pdata->brt_val) {
@@ -394,10 +396,11 @@ err_out:
 static int __devexit lm3530_remove(struct i2c_client *client)
 {
 	struct lm3530_data *drvdata = i2c_get_clientdata(client);
+	struct lm3530_platform_data *pdata = drvdata->pdata;
 
 	device_remove_file(drvdata->led_dev.dev, &dev_attr_mode);
 
-	if (drvdata->enable)
+	if (drvdata->enable && !pdata->is_vin_always_on)
 		regulator_disable(drvdata->regulator);
 	regulator_put(drvdata->regulator);
 	led_classdev_unregister(&drvdata->led_dev);
diff --git a/include/linux/led-lm3530.h b/include/linux/led-lm3530.h
index 513e9c3..0240204 100644
--- a/include/linux/led-lm3530.h
+++ b/include/linux/led-lm3530.h
@@ -92,6 +92,8 @@ struct lm3530_pwm_data {
  * @als2_resistor_sel: internal resistance from ALS2 input to ground
  * @brt_val: brightness value (0-255)
  * @name: led device name
+ * @is_vin_always_on: set to true if VIN is always on.
+ *		      ex) VIN is connected with VBATT
  * @pwm_data: PWM control functions. only valid when the mode is PWM.
  */
 struct lm3530_platform_data {
@@ -112,6 +114,7 @@ struct lm3530_platform_data {
 	u8 brt_val;
 
 	const char *name;
+	bool is_vin_always_on;
 	struct lm3530_pwm_data pwm_data;
 };
 
-- 
1.7.4.1


Best Regards,
Milo (Woogyom) Kim
Texas Instruments Incorporated

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