1 files changed, 27 insertions, 1 deletions

diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c
index 52d2ca147d8f..8b05d8e97543 100644
--- a/drivers/input/touchscreen/ads7846.c
+++ b/drivers/input/touchscreen/ads7846.c
@@ -27,6 +27,7 @@
 #include <linux/gpio.h>
 #include <linux/spi/spi.h>
 #include <linux/spi/ads7846.h>
+#include <linux/regulator/consumer.h>
 #include <asm/irq.h>
 
 /*
@@ -85,6 +86,7 @@ struct ads7846 {
 	char			name[32];
 
 	struct spi_device	*spi;
+	struct regulator	*reg;
 
 #if defined(CONFIG_HWMON) || defined(CONFIG_HWMON_MODULE)
 	struct attribute_group	*attr_group;
@@ -788,6 +790,8 @@ static void ads7846_disable(struct ads7846 *ts)
 		}
 	}
 
+	regulator_disable(ts->reg);
+
 	/* we know the chip's in lowpower mode since we always
 	 * leave it that way after every request
 	 */
@@ -799,6 +803,8 @@ static void ads7846_enable(struct ads7846 *ts)
 	if (!ts->disabled)
 		return;
 
+	regulator_enable(ts->reg);
+
 	ts->disabled = 0;
 	ts->irq_disabled = 0;
 	enable_irq(ts->spi->irq);
@@ -1139,6 +1145,19 @@ static int __devinit ads7846_probe(struct spi_device *spi)
 
 	ts->last_msg = m;
 
+	ts->reg = regulator_get(&spi->dev, "vcc");
+	if (IS_ERR(ts->reg)) {
+		dev_err(&spi->dev, "unable to get regulator: %ld\n",
+			PTR_ERR(ts->reg));
+		goto err_free_gpio;
+	}
+
+	err = regulator_enable(ts->reg);
+	if (err) {
+		dev_err(&spi->dev, "unable to enable regulator: %d\n", err);
+		goto err_put_regulator;
+	}
+
 	if (request_irq(spi->irq, ads7846_irq, IRQF_TRIGGER_FALLING,
 			spi->dev.driver->name, ts)) {
 		dev_info(&spi->dev,
@@ -1148,7 +1167,7 @@ static int __devinit ads7846_probe(struct spi_device *spi)
 				  spi->dev.driver->name, ts);
 		if (err) {
 			dev_dbg(&spi->dev, "irq %d busy?\n", spi->irq);
-			goto err_free_gpio;
+			goto err_disable_regulator;
 		}
 	}
 
@@ -1180,6 +1199,10 @@ static int __devinit ads7846_probe(struct spi_device *spi)
 	ads784x_hwmon_unregister(spi, ts);
  err_free_irq:
 	free_irq(spi->irq, ts);
+ err_disable_regulator:
+	regulator_disable(ts->reg);
+ err_put_regulator:
+	regulator_put(ts->reg);
  err_free_gpio:
 	if (ts->gpio_pendown != -1)
 		gpio_free(ts->gpio_pendown);
@@ -1208,6 +1231,9 @@ static int __devexit ads7846_remove(struct spi_device *spi)
 	/* suspend left the IRQ disabled */
 	enable_irq(ts->spi->irq);
 
+	regulator_disable(ts->reg);
+	regulator_put(ts->reg);
+
 	if (ts->gpio_pendown != -1)
 		gpio_free(ts->gpio_pendown);