[PATCH RFC] mfd: twl4030-madc: Enable ADC channels 3-6

[Steve Sakoman <sakoman@xxxxxxxxx>]

Currently the driver does not explicitly set the TWL4030_USB_SEL_MADC_MCPC
bit to enable madc input channels 3 through 6.  This results in readings near
zero for these channels since the inputs are grounded if this bit is not set.

Signed-off-by: Steve Sakoman <steve@xxxxxxxxxxx>
---

diff --git a/drivers/mfd/twl4030-madc.c b/drivers/mfd/twl4030-madc.c
index 834f824..56a8e9b 100644
--- a/drivers/mfd/twl4030-madc.c
+++ b/drivers/mfd/twl4030-madc.c
@@ -725,6 +725,23 @@ static int __devinit twl4030_madc_probe(struct
platform_device *pdev)
 	if (ret < 0)
 		goto err_current_generator;

+	/* Enable ADCIN3 through 6 */
+	ret = twl_i2c_read_u8(TWL4030_MODULE_USB,
+			      &regval, TWL4030_USB_CARKIT_ANA_CTRL);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to read reg CARKIT_ANA_CTRL 0x%X\n",
+			TWL4030_USB_CARKIT_ANA_CTRL);
+		goto err_i2c;
+	}
+	regval |= TWL4030_USB_SEL_MADC_MCPC;
+	ret = twl_i2c_write_u8(TWL4030_MODULE_USB,
+			       regval, TWL4030_USB_CARKIT_ANA_CTRL);
+	if (ret) {
+		dev_err(&pdev->dev, "unable to write reg CARKIT_ANA_CTRL 0x%X\n",
+			TWL4030_USB_CARKIT_ANA_CTRL);
+		goto err_i2c;
+	}
+
 	ret = twl_i2c_read_u8(TWL4030_MODULE_MAIN_CHARGE,
 			      &regval, TWL4030_BCI_BCICTL1);
 	if (ret) {
diff --git a/include/linux/i2c/twl4030-madc.h b/include/linux/i2c/twl4030-madc.h
index 530e11b..f017495 100644
--- a/include/linux/i2c/twl4030-madc.h
+++ b/include/linux/i2c/twl4030-madc.h
@@ -120,6 +120,9 @@ enum sample_type {
 #define CURR_PSR_R1		44
 #define CURR_PSR_R2		88

+#define TWL4030_USB_CARKIT_ANA_CTRL	0xBB
+#define TWL4030_USB_SEL_MADC_MCPC	(1<<3)
+
 #define TWL4030_BCI_BCICTL1	0x23
 #define TWL4030_BCI_CGAIN	0x020
 #define TWL4030_BCI_MESBAT	(1 << 1)
--
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