ENGR00143921-1 - EPDC/MAX17135: Add controls for V3P3 regulator

- Added V3P3 regulator to max17135
- Added calls to enable/disable V3P3 regulator from EPDC driver
- Improved Kconfig detail for max17135 MFD and HWMON entries

Signed-off-by: Danny Nold <dannynold@freescale.com>

4 files changed, 68 insertions, 2 deletions

diff --git a/drivers/hwmon/Kconfig b/drivers/hwmon/Kconfig
index 1b7f2f3f7947..15d23fccafe9 100644
--- a/drivers/hwmon/Kconfig
+++ b/drivers/hwmon/Kconfig
@@ -693,7 +693,7 @@ config SENSORS_MAX1619
 	  will be called max1619.
 
 config SENSORS_MAX17135
-	tristate "Maxim MAX17135"
+	tristate "Maxim MAX17135 EPD temperature sensor"
 	depends on I2C
 	help
 	  If you say yes here you get support for MAX17135 PMIC sensor.
diff --git a/drivers/mfd/Kconfig b/drivers/mfd/Kconfig
index b74dbcbcd791..ea812cb52ad7 100644
--- a/drivers/mfd/Kconfig
+++ b/drivers/mfd/Kconfig
@@ -678,7 +678,7 @@ config MFD_WL1273_CORE
 	  audio codec.
 
 config MFD_MAX17135
-    tristate "MAX17135 PMIC core"
+    tristate "Maxim MAX17135 EPD PMIC core"
 	depends on I2C
     help
       This is the MAX17135 PMIC support. It includes
diff --git a/drivers/regulator/max17135-regulator.c b/drivers/regulator/max17135-regulator.c
index 97bf2aff8b3f..45d4501ef7a5 100644
--- a/drivers/regulator/max17135-regulator.c
+++ b/drivers/regulator/max17135-regulator.c
@@ -354,6 +354,33 @@ static int max17135_display_is_enabled(struct regulator_dev *reg)
 		return 1;
 }
 
+static int max17135_v3p3_enable(struct regulator_dev *reg)
+{
+	struct max17135 *max17135 = rdev_get_drvdata(reg);
+
+	gpio_set_value(max17135->gpio_pmic_v3p3, 1);
+	return 0;
+}
+
+static int max17135_v3p3_disable(struct regulator_dev *reg)
+{
+	struct max17135 *max17135 = rdev_get_drvdata(reg);
+
+	gpio_set_value(max17135->gpio_pmic_v3p3, 0);
+	return 0;
+}
+
+static int max17135_v3p3_is_enabled(struct regulator_dev *reg)
+{
+	struct max17135 *max17135 = rdev_get_drvdata(reg);
+	int gpio = gpio_get_value(max17135->gpio_pmic_v3p3);
+
+	if (gpio == 0)
+		return 0;
+	else
+		return 1;
+}
+
 /*
  * Regulator operations
  */
@@ -394,6 +421,13 @@ static struct regulator_ops max17135_vneg_ops = {
 static struct regulator_ops max17135_vpos_ops = {
 };
 
+static struct regulator_ops max17135_v3p3_ops = {
+	.enable = max17135_v3p3_enable,
+	.disable = max17135_v3p3_disable,
+	.is_enabled = max17135_v3p3_is_enabled,
+};
+
+
 /*
  * Regulator descriptors
  */
@@ -454,6 +488,13 @@ static struct regulator_desc max17135_reg[MAX17135_NUM_REGULATORS] = {
 	.type = REGULATOR_VOLTAGE,
 	.owner = THIS_MODULE,
 },
+{
+	.name = "V3P3",
+	.id = MAX17135_V3P3,
+	.ops = &max17135_v3p3_ops,
+	.type = REGULATOR_VOLTAGE,
+	.owner = THIS_MODULE,
+},
 };
 
 static void max17135_setup_timings(struct max17135 *max17135)
diff --git a/drivers/video/mxc/mxc_epdc_fb.c b/drivers/video/mxc/mxc_epdc_fb.c
index 6e7ac35882d9..192264e8aca7 100644
--- a/drivers/video/mxc/mxc_epdc_fb.c
+++ b/drivers/video/mxc/mxc_epdc_fb.c
@@ -135,6 +135,7 @@ struct mxc_epdc_fb_data {
 	struct clk *epdc_clk_pix;
 	struct regulator *display_regulator;
 	struct regulator *vcom_regulator;
+	struct regulator *v3p3_regulator;
 	bool fw_default_load;
 
 	/* FB elements related to EPDC updates */
@@ -866,6 +867,17 @@ static void epdc_powerup(struct mxc_epdc_fb_data *fb_data)
 
 	fb_data->updates_active = true;
 
+	/* Enable the v3p3 regulator */
+	ret = regulator_enable(fb_data->v3p3_regulator);
+	if (IS_ERR((void *)ret)) {
+		dev_err(fb_data->dev, "Unable to enable V3P3 regulator."
+			"err = 0x%x\n", ret);
+		mutex_unlock(&fb_data->power_mutex);
+		return;
+	}
+
+	msleep(1);
+
 	/* Enable pins used by EPDC */
 	if (fb_data->pdata->enable_pins)
 		fb_data->pdata->enable_pins();
@@ -925,6 +937,9 @@ static void epdc_powerdown(struct mxc_epdc_fb_data *fb_data)
 	if (fb_data->pdata->disable_pins)
 		fb_data->pdata->disable_pins();
 
+	/* turn off the V3p3 */
+	regulator_disable(fb_data->v3p3_regulator);
+
 	fb_data->power_state = POWER_STATE_OFF;
 	fb_data->powering_down = false;
 
@@ -3959,6 +3974,15 @@ int __devinit mxc_epdc_fb_probe(struct platform_device *pdev)
 		ret = -ENODEV;
 		goto out_irq;
 	}
+	fb_data->v3p3_regulator = regulator_get(NULL, "V3P3");
+	if (IS_ERR(fb_data->v3p3_regulator)) {
+		regulator_put(fb_data->vcom_regulator);
+		regulator_put(fb_data->display_regulator);
+		dev_err(&pdev->dev, "Unable to get V3P3 regulator."
+			"err = 0x%x\n", (int)fb_data->vcom_regulator);
+		ret = -ENODEV;
+		goto out_irq;
+	}
 
 	if (device_create_file(info->dev, &fb_attrs[0]))
 		dev_err(&pdev->dev, "Unable to create file from fb_attrs\n");
@@ -4163,6 +4187,7 @@ static int mxc_epdc_fb_remove(struct platform_device *pdev)
 
 	regulator_put(fb_data->display_regulator);
 	regulator_put(fb_data->vcom_regulator);
+	regulator_put(fb_data->v3p3_regulator);
 
 	unregister_framebuffer(&fb_data->info);
 	free_irq(fb_data->epdc_irq, fb_data);