diff mbox

[PATCHv2,3/3] hwmon: da9052: add support for TSI channel

Message ID 20170627143859.21312-4-sebastian.reichel@collabora.co.uk (mailing list archive)
State New, archived
Headers show

Commit Message

Sebastian Reichel June 27, 2017, 2:38 p.m. UTC
TSI channel has a 4 channel mux connected to it and is normally
used for touchscreen support. The hardware may alternatively
use it as general purpose adc.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
---
 .../devicetree/bindings/mfd/da9052-i2c.txt         |   8 +
 drivers/hwmon/da9052-hwmon.c                       | 252 ++++++++++++++++++++-
 drivers/input/touchscreen/da9052_tsi.c             |   5 +
 include/linux/mfd/da9052/da9052.h                  |   6 +
 4 files changed, 267 insertions(+), 4 deletions(-)

Comments

Guenter Roeck June 28, 2017, 11:39 a.m. UTC | #1
On 06/27/2017 07:38 AM, Sebastian Reichel wrote:
> TSI channel has a 4 channel mux connected to it and is normally
> used for touchscreen support. The hardware may alternatively
> use it as general purpose adc.
> 
> Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.co.uk>
> ---
>   .../devicetree/bindings/mfd/da9052-i2c.txt         |   8 +
>   drivers/hwmon/da9052-hwmon.c                       | 252 ++++++++++++++++++++-
>   drivers/input/touchscreen/da9052_tsi.c             |   5 +
>   include/linux/mfd/da9052/da9052.h                  |   6 +
>   4 files changed, 267 insertions(+), 4 deletions(-)
> 
> diff --git a/Documentation/devicetree/bindings/mfd/da9052-i2c.txt b/Documentation/devicetree/bindings/mfd/da9052-i2c.txt
> index 9554292dc6cb..a4fcf6ee4d7b 100644
> --- a/Documentation/devicetree/bindings/mfd/da9052-i2c.txt
> +++ b/Documentation/devicetree/bindings/mfd/da9052-i2c.txt
> @@ -4,6 +4,14 @@ Required properties:
>   - compatible : Should be "dlg,da9052", "dlg,da9053-aa",
>   			 "dlg,da9053-ab", or "dlg,da9053-bb"
>   
> +Optional properties:
> +- diag,tsi-as-adc : Boolean, if set the X+, X-, Y+, Y- touchscreen
> +                    input lines are used as general purpose analogue
> +					input.
> +- tsiref-supply: Phandle to the regulator, which provides the reference
> +                 voltage for the TSIREF pin. Must be provided when the
> +			     touchscreen pins are used for ADC purposes.
> +

The subject line does not include a notion that devicetree properties are added,
meaning DT maintainers probably won;t have a look. It is better to split
the DT changes into a separate patch to make sure they get the necessary attention.

>   Sub-nodes:
>   - regulators : Contain the regulator nodes. The DA9052/53 regulators are
>     bound using their names as listed below:
> diff --git a/drivers/hwmon/da9052-hwmon.c b/drivers/hwmon/da9052-hwmon.c
> index 708c91ac601f..85bfff9cf43b 100644
> --- a/drivers/hwmon/da9052-hwmon.c
> +++ b/drivers/hwmon/da9052-hwmon.c
> @@ -20,13 +20,19 @@
>   #include <linux/module.h>
>   #include <linux/slab.h>
>   #include <linux/platform_device.h>
> +#include <linux/property.h>
>   
>   #include <linux/mfd/da9052/da9052.h>
>   #include <linux/mfd/da9052/reg.h>
> +#include <linux/regulator/consumer.h>
>   
>   struct da9052_hwmon {
> -	struct da9052	*da9052;
> -	struct mutex	hwmon_lock;
> +	struct da9052		*da9052;
> +	struct mutex		hwmon_lock;
> +	bool			tsi_as_adc;
> +	int			tsiref_mv;
> +	struct regulator	*tsiref;
> +	struct completion	tsidone;
>   };
>   
>   static const char * const input_names[] = {
> @@ -37,6 +43,10 @@ static const char * const input_names[] = {
>   	[DA9052_ADC_IN4]	=	"ADC IN4",
>   	[DA9052_ADC_IN5]	=	"ADC IN5",
>   	[DA9052_ADC_IN6]	=	"ADC IN6",
> +	[DA9052_ADC_TSI_XP]	=	"ADC TS X+",
> +	[DA9052_ADC_TSI_YP]	=	"ADC TS Y+",
> +	[DA9052_ADC_TSI_XN]	=	"ADC TS X-",
> +	[DA9052_ADC_TSI_YN]	=	"ADC TS Y-",
>   	[DA9052_ADC_TJUNC]	=	"BATTERY JUNCTION TEMP",
>   	[DA9052_ADC_VBBAT]	=	"BACK-UP BATTERY VOLTAGE",
>   };
> @@ -59,6 +69,11 @@ static inline int vbbat_reg_to_mv(int value)
>   	return DIV_ROUND_CLOSEST(value * 5000, 1023);
>   }
>   
> +static inline int input_tsireg_to_mv(struct da9052_hwmon *hwmon, int value)
> +{
> +	return DIV_ROUND_CLOSEST(value * hwmon->tsiref_mv, 1023);
> +}
> +
>   static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
>   {
>   	return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
> @@ -154,6 +169,101 @@ static ssize_t da9052_read_misc_channel(struct device *dev,
>   	return sprintf(buf, "%d\n", input_reg_to_mv(ret));
>   }
>   
> +static int da9052_request_tsi_read(struct da9052_hwmon *hwmon, int channel)
> +{
> +	u8 val = BIT(6); /* TSI_MAN */
> +
> +	switch (channel) {
> +	case DA9052_ADC_TSI_XP:
> +		val |= (0 << 4); /* TSI_MUX */
> +		break;
> +	case DA9052_ADC_TSI_YP:
> +		val |= (1 << 4); /* TSI_MUX */
> +		break;
> +	case DA9052_ADC_TSI_XN:
> +		val |= (2 << 4); /* TSI_MUX */
> +		break;
> +	case DA9052_ADC_TSI_YN:
> +		val |= (3 << 4); /* TSI_MUX */
> +		break;
> +	}
> +
> +	return da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_B_REG, val);
> +}
> +
> +static int da9052_get_tsi_result(struct da9052_hwmon *hwmon, int channel)
> +{
> +	int msb, lsb;
> +
> +	switch (channel) {
> +	case DA9052_ADC_TSI_XP:
> +	case DA9052_ADC_TSI_XN:
> +		msb = da9052_reg_read(hwmon->da9052, DA9052_TSI_X_MSB_REG);
> +		if (msb < 0)
> +			return msb;
> +
> +		lsb = da9052_reg_read(hwmon->da9052, DA9052_TSI_LSB_REG);
> +		if (lsb < 0)
> +			return lsb;
> +
> +		break;
> +	case DA9052_ADC_TSI_YP:
> +	case DA9052_ADC_TSI_YN:
> +		msb = da9052_reg_read(hwmon->da9052, DA9052_TSI_Y_MSB_REG);
> +		if (msb < 0)
> +			return msb;
> +
> +		lsb = da9052_reg_read(hwmon->da9052, DA9052_TSI_LSB_REG);
> +		if (lsb < 0)
> +			return lsb;
> +		lsb >>= 2;
> +
> +		break;
> +	default:
> +		return -ENXIO;
> +	}
> +
> +	return (msb << 2) | (lsb & 0x3);
> +}
> +
> +
> +static ssize_t __da9052_read_tsi(struct device *dev, int channel)
> +{
> +	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
> +	int ret;
> +
> +	reinit_completion(&hwmon->tsidone);
> +
> +	ret = da9052_request_tsi_read(hwmon, channel);
> +	if (ret < 0)
> +		return ret;
> +
> +	/* Wait for an conversion done interrupt */
> +	if (!wait_for_completion_timeout(&hwmon->tsidone,
> +					 msecs_to_jiffies(500)))
> +		return -ETIMEDOUT;
> +
> +	return da9052_get_tsi_result(hwmon, channel);
> +}
> +
> +static ssize_t da9052_read_tsi(struct device *dev,
> +			       struct device_attribute *devattr,
> +			       char *buf)
> +{
> +	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
> +	int channel = to_sensor_dev_attr(devattr)->index;
> +	int ret;
> +
> +	mutex_lock(&hwmon->hwmon_lock);
> +	ret = __da9052_read_tsi(dev, channel);
> +	mutex_unlock(&hwmon->hwmon_lock);
> +
> +	if (ret < 0)
> +		return ret;
> +	else
> +		return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret));
> +}
> +
>   static ssize_t da9052_read_tjunc(struct device *dev,
>   				 struct device_attribute *devattr, char *buf)
>   {
> @@ -196,6 +306,27 @@ static ssize_t show_label(struct device *dev,
>   		       input_names[to_sensor_dev_attr(devattr)->index]);
>   }
>   
> +static umode_t da9052_channel_is_visible(struct kobject *kobj,
> +					 struct attribute *a, int index)
> +{
> +	struct device *dev = container_of(kobj, struct device, kobj);
> +	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
> +
> +	switch (index) {
> +	case DA9052_ADC_TSI_XP:
> +	case DA9052_ADC_TSI_YP:
> +	case DA9052_ADC_TSI_XN:
> +	case DA9052_ADC_TSI_YN:
> +		if (!hwmon->tsi_as_adc)
> +			return 0;
> +		break;
> +	default:
> +		break;
> +	}
> +
> +	return a->mode;
> +}
> +
>   static SENSOR_DEVICE_ATTR(in0_input, 0444, da9052_read_vddout, NULL,
>   			  DA9052_ADC_VDDOUT);
>   static SENSOR_DEVICE_ATTR(in0_label, 0444, show_label, NULL,
> @@ -221,6 +352,23 @@ static SENSOR_DEVICE_ATTR(in9_input, 0444, da9052_read_vbbat, NULL,
>   static SENSOR_DEVICE_ATTR(in9_label, 0444, show_label, NULL,
>   			  DA9052_ADC_VBBAT);
>   
> +static SENSOR_DEVICE_ATTR(in70_input, 0444, da9052_read_tsi, NULL,
> +			  DA9052_ADC_TSI_XP);
> +static SENSOR_DEVICE_ATTR(in70_label, 0444, show_label, NULL,
> +			  DA9052_ADC_TSI_XP);
> +static SENSOR_DEVICE_ATTR(in71_input, 0444, da9052_read_tsi, NULL,
> +			  DA9052_ADC_TSI_XN);
> +static SENSOR_DEVICE_ATTR(in71_label, 0444, show_label, NULL,
> +			  DA9052_ADC_TSI_XN);
> +static SENSOR_DEVICE_ATTR(in72_input, 0444, da9052_read_tsi, NULL,
> +			  DA9052_ADC_TSI_YP);
> +static SENSOR_DEVICE_ATTR(in72_label, 0444, show_label, NULL,
> +			  DA9052_ADC_TSI_YP);
> +static SENSOR_DEVICE_ATTR(in73_input, 0444, da9052_read_tsi, NULL,
> +			  DA9052_ADC_TSI_YN);
> +static SENSOR_DEVICE_ATTR(in73_label, 0444, show_label, NULL,
> +			  DA9052_ADC_TSI_YN);
> +
>   static SENSOR_DEVICE_ATTR(curr1_input, 0444, da9052_read_ich, NULL,
>   			  DA9052_ADC_ICH);
>   static SENSOR_DEVICE_ATTR(curr1_label, 0444, show_label, NULL,
> @@ -246,6 +394,14 @@ static struct attribute *da9052_attrs[] = {
>   	&sensor_dev_attr_in5_label.dev_attr.attr,
>   	&sensor_dev_attr_in6_input.dev_attr.attr,
>   	&sensor_dev_attr_in6_label.dev_attr.attr,
> +	&sensor_dev_attr_in70_input.dev_attr.attr,
> +	&sensor_dev_attr_in70_label.dev_attr.attr,
> +	&sensor_dev_attr_in71_input.dev_attr.attr,
> +	&sensor_dev_attr_in71_label.dev_attr.attr,
> +	&sensor_dev_attr_in72_input.dev_attr.attr,
> +	&sensor_dev_attr_in72_label.dev_attr.attr,
> +	&sensor_dev_attr_in73_input.dev_attr.attr,
> +	&sensor_dev_attr_in73_label.dev_attr.attr,
>   	&sensor_dev_attr_in9_input.dev_attr.attr,
>   	&sensor_dev_attr_in9_label.dev_attr.attr,
>   	&sensor_dev_attr_curr1_input.dev_attr.attr,
> @@ -257,29 +413,117 @@ static struct attribute *da9052_attrs[] = {
>   	NULL
>   };
>   
> -ATTRIBUTE_GROUPS(da9052);
> +static const struct attribute_group da9052_group = {
> +	.attrs = da9052_attrs,
> +	.is_visible = da9052_channel_is_visible,
> +};
> +__ATTRIBUTE_GROUPS(da9052);
> +
> +static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data)
> +{
> +	struct da9052_hwmon *hwmon = data;
> +
> +	complete(&hwmon->tsidone);
> +	return IRQ_HANDLED;
> +}
>   
>   static int da9052_hwmon_probe(struct platform_device *pdev)
>   {
>   	struct device *dev = &pdev->dev;
>   	struct da9052_hwmon *hwmon;
>   	struct device *hwmon_dev;
> +	int err;
>   
>   	hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL);
>   	if (!hwmon)
>   		return -ENOMEM;
>   
> +	platform_set_drvdata(pdev, hwmon);
> +
>   	mutex_init(&hwmon->hwmon_lock);
>   	hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
>   
> +	init_completion(&hwmon->tsidone);
> +
> +	hwmon->tsi_as_adc =
> +		device_property_read_bool(pdev->dev.parent, "diag,tsi-as-adc");
> +
> +	if (hwmon->tsi_as_adc) {
> +		hwmon->tsiref = devm_regulator_get(pdev->dev.parent, "tsiref");
> +		if (IS_ERR(hwmon->tsiref)) {
> +			err = PTR_ERR(hwmon->tsiref);
> +			dev_err(&pdev->dev, "failed to get tsiref: %d", err);
> +			return err;
> +		}
> +
> +		err = regulator_enable(hwmon->tsiref);
> +		if (err)
> +			return err;
> +
> +		hwmon->tsiref_mv = regulator_get_voltage(hwmon->tsiref);
> +		if (hwmon->tsiref_mv < 0) {
> +			err = hwmon->tsiref_mv;
> +			goto exit_regulator;
> +		}
> +
> +		/* convert from microvolt (DT) to millivolt (hwmon) */
> +		hwmon->tsiref_mv /= 1000;
> +
> +		/* TSIREF limits from datasheet */
> +		if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) {
> +			dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d",
> +				hwmon->tsiref_mv);
> +			err = -ENXIO;
> +			goto exit_regulator;
> +		}
> +
> +		/* disable touchscreen features */
> +		da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00);
> +
> +		err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY,
> +					 "tsiready-irq", da9052_tsi_datardy_irq,
> +					 hwmon);
> +		if (err) {
> +			dev_err(&pdev->dev, "Failed to register TSIRDY IRQ: %d",
> +				err);
> +			goto exit_regulator;
> +		}
> +	}
> +
>   	hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052",
>   							   hwmon,
>   							   da9052_groups);
> -	return PTR_ERR_OR_ZERO(hwmon_dev);
> +	err = PTR_ERR_OR_ZERO(hwmon_dev);
> +	if (err)
> +		goto exit_irq;
> +
> +	return 0;
> +
> +exit_irq:
> +	if (hwmon->tsi_as_adc)
> +		da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
> +exit_regulator:
> +	if (hwmon->tsiref)
> +		regulator_disable(hwmon->tsiref);
> +
> +	return err;
> +}
> +
> +static int da9052_hwmon_remove(struct platform_device *pdev)
> +{
> +	struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
> +
> +	if (hwmon->tsi_as_adc) {
> +		da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
> +		regulator_disable(hwmon->tsiref);
> +	}
> +
> +	return 0;
>   }
>   
>   static struct platform_driver da9052_hwmon_driver = {
>   	.probe = da9052_hwmon_probe,
> +	.remove = da9052_hwmon_remove,
>   	.driver = {
>   		.name = "da9052-hwmon",
>   	},
> diff --git a/drivers/input/touchscreen/da9052_tsi.c b/drivers/input/touchscreen/da9052_tsi.c
> index 5a013bb7bcad..f0cb239546a9 100644
> --- a/drivers/input/touchscreen/da9052_tsi.c
> +++ b/drivers/input/touchscreen/da9052_tsi.c
> @@ -16,6 +16,7 @@
>   #include <linux/delay.h>
>   #include <linux/platform_device.h>
>   #include <linux/interrupt.h>
> +#include <linux/property.h>
>   
>   #include <linux/mfd/da9052/reg.h>
>   #include <linux/mfd/da9052/da9052.h>
> @@ -238,6 +239,10 @@ static int da9052_ts_probe(struct platform_device *pdev)
>   	if (!da9052)
>   		return -EINVAL;
>   
> +	/* check if pins are used as general purpose ADC input */
> +	if (device_property_read_bool(pdev->dev.parent, "diag,tsi-as-adc"))
> +		return -ENODEV;
> +
>   	tsi = kzalloc(sizeof(struct da9052_tsi), GFP_KERNEL);
>   	input_dev = input_allocate_device();
>   	if (!tsi || !input_dev) {
> diff --git a/include/linux/mfd/da9052/da9052.h b/include/linux/mfd/da9052/da9052.h
> index ce9230af09c2..ae5b663836d0 100644
> --- a/include/linux/mfd/da9052/da9052.h
> +++ b/include/linux/mfd/da9052/da9052.h
> @@ -45,6 +45,12 @@
>   #define DA9052_ADC_TJUNC	8
>   #define DA9052_ADC_VBBAT	9
>   
> +/* TSI channel has its own 4 channel mux */
> +#define DA9052_ADC_TSI_XP	70
> +#define DA9052_ADC_TSI_XN	71
> +#define DA9052_ADC_TSI_YP	72
> +#define DA9052_ADC_TSI_YN	73
> +
>   #define DA9052_IRQ_DCIN	0
>   #define DA9052_IRQ_VBUS	1
>   #define DA9052_IRQ_DCINREM	2
> 

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diff mbox

Patch

diff --git a/Documentation/devicetree/bindings/mfd/da9052-i2c.txt b/Documentation/devicetree/bindings/mfd/da9052-i2c.txt
index 9554292dc6cb..a4fcf6ee4d7b 100644
--- a/Documentation/devicetree/bindings/mfd/da9052-i2c.txt
+++ b/Documentation/devicetree/bindings/mfd/da9052-i2c.txt
@@ -4,6 +4,14 @@  Required properties:
 - compatible : Should be "dlg,da9052", "dlg,da9053-aa",
 			 "dlg,da9053-ab", or "dlg,da9053-bb"
 
+Optional properties:
+- diag,tsi-as-adc : Boolean, if set the X+, X-, Y+, Y- touchscreen
+                    input lines are used as general purpose analogue
+					input.
+- tsiref-supply: Phandle to the regulator, which provides the reference
+                 voltage for the TSIREF pin. Must be provided when the
+			     touchscreen pins are used for ADC purposes.
+
 Sub-nodes:
 - regulators : Contain the regulator nodes. The DA9052/53 regulators are
   bound using their names as listed below:
diff --git a/drivers/hwmon/da9052-hwmon.c b/drivers/hwmon/da9052-hwmon.c
index 708c91ac601f..85bfff9cf43b 100644
--- a/drivers/hwmon/da9052-hwmon.c
+++ b/drivers/hwmon/da9052-hwmon.c
@@ -20,13 +20,19 @@ 
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/platform_device.h>
+#include <linux/property.h>
 
 #include <linux/mfd/da9052/da9052.h>
 #include <linux/mfd/da9052/reg.h>
+#include <linux/regulator/consumer.h>
 
 struct da9052_hwmon {
-	struct da9052	*da9052;
-	struct mutex	hwmon_lock;
+	struct da9052		*da9052;
+	struct mutex		hwmon_lock;
+	bool			tsi_as_adc;
+	int			tsiref_mv;
+	struct regulator	*tsiref;
+	struct completion	tsidone;
 };
 
 static const char * const input_names[] = {
@@ -37,6 +43,10 @@  static const char * const input_names[] = {
 	[DA9052_ADC_IN4]	=	"ADC IN4",
 	[DA9052_ADC_IN5]	=	"ADC IN5",
 	[DA9052_ADC_IN6]	=	"ADC IN6",
+	[DA9052_ADC_TSI_XP]	=	"ADC TS X+",
+	[DA9052_ADC_TSI_YP]	=	"ADC TS Y+",
+	[DA9052_ADC_TSI_XN]	=	"ADC TS X-",
+	[DA9052_ADC_TSI_YN]	=	"ADC TS Y-",
 	[DA9052_ADC_TJUNC]	=	"BATTERY JUNCTION TEMP",
 	[DA9052_ADC_VBBAT]	=	"BACK-UP BATTERY VOLTAGE",
 };
@@ -59,6 +69,11 @@  static inline int vbbat_reg_to_mv(int value)
 	return DIV_ROUND_CLOSEST(value * 5000, 1023);
 }
 
+static inline int input_tsireg_to_mv(struct da9052_hwmon *hwmon, int value)
+{
+	return DIV_ROUND_CLOSEST(value * hwmon->tsiref_mv, 1023);
+}
+
 static inline int da9052_enable_vddout_channel(struct da9052 *da9052)
 {
 	return da9052_reg_update(da9052, DA9052_ADC_CONT_REG,
@@ -154,6 +169,101 @@  static ssize_t da9052_read_misc_channel(struct device *dev,
 	return sprintf(buf, "%d\n", input_reg_to_mv(ret));
 }
 
+static int da9052_request_tsi_read(struct da9052_hwmon *hwmon, int channel)
+{
+	u8 val = BIT(6); /* TSI_MAN */
+
+	switch (channel) {
+	case DA9052_ADC_TSI_XP:
+		val |= (0 << 4); /* TSI_MUX */
+		break;
+	case DA9052_ADC_TSI_YP:
+		val |= (1 << 4); /* TSI_MUX */
+		break;
+	case DA9052_ADC_TSI_XN:
+		val |= (2 << 4); /* TSI_MUX */
+		break;
+	case DA9052_ADC_TSI_YN:
+		val |= (3 << 4); /* TSI_MUX */
+		break;
+	}
+
+	return da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_B_REG, val);
+}
+
+static int da9052_get_tsi_result(struct da9052_hwmon *hwmon, int channel)
+{
+	int msb, lsb;
+
+	switch (channel) {
+	case DA9052_ADC_TSI_XP:
+	case DA9052_ADC_TSI_XN:
+		msb = da9052_reg_read(hwmon->da9052, DA9052_TSI_X_MSB_REG);
+		if (msb < 0)
+			return msb;
+
+		lsb = da9052_reg_read(hwmon->da9052, DA9052_TSI_LSB_REG);
+		if (lsb < 0)
+			return lsb;
+
+		break;
+	case DA9052_ADC_TSI_YP:
+	case DA9052_ADC_TSI_YN:
+		msb = da9052_reg_read(hwmon->da9052, DA9052_TSI_Y_MSB_REG);
+		if (msb < 0)
+			return msb;
+
+		lsb = da9052_reg_read(hwmon->da9052, DA9052_TSI_LSB_REG);
+		if (lsb < 0)
+			return lsb;
+		lsb >>= 2;
+
+		break;
+	default:
+		return -ENXIO;
+	}
+
+	return (msb << 2) | (lsb & 0x3);
+}
+
+
+static ssize_t __da9052_read_tsi(struct device *dev, int channel)
+{
+	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
+	int ret;
+
+	reinit_completion(&hwmon->tsidone);
+
+	ret = da9052_request_tsi_read(hwmon, channel);
+	if (ret < 0)
+		return ret;
+
+	/* Wait for an conversion done interrupt */
+	if (!wait_for_completion_timeout(&hwmon->tsidone,
+					 msecs_to_jiffies(500)))
+		return -ETIMEDOUT;
+
+	return da9052_get_tsi_result(hwmon, channel);
+}
+
+static ssize_t da9052_read_tsi(struct device *dev,
+			       struct device_attribute *devattr,
+			       char *buf)
+{
+	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
+	int channel = to_sensor_dev_attr(devattr)->index;
+	int ret;
+
+	mutex_lock(&hwmon->hwmon_lock);
+	ret = __da9052_read_tsi(dev, channel);
+	mutex_unlock(&hwmon->hwmon_lock);
+
+	if (ret < 0)
+		return ret;
+	else
+		return sprintf(buf, "%d\n", input_tsireg_to_mv(hwmon, ret));
+}
+
 static ssize_t da9052_read_tjunc(struct device *dev,
 				 struct device_attribute *devattr, char *buf)
 {
@@ -196,6 +306,27 @@  static ssize_t show_label(struct device *dev,
 		       input_names[to_sensor_dev_attr(devattr)->index]);
 }
 
+static umode_t da9052_channel_is_visible(struct kobject *kobj,
+					 struct attribute *a, int index)
+{
+	struct device *dev = container_of(kobj, struct device, kobj);
+	struct da9052_hwmon *hwmon = dev_get_drvdata(dev);
+
+	switch (index) {
+	case DA9052_ADC_TSI_XP:
+	case DA9052_ADC_TSI_YP:
+	case DA9052_ADC_TSI_XN:
+	case DA9052_ADC_TSI_YN:
+		if (!hwmon->tsi_as_adc)
+			return 0;
+		break;
+	default:
+		break;
+	}
+
+	return a->mode;
+}
+
 static SENSOR_DEVICE_ATTR(in0_input, 0444, da9052_read_vddout, NULL,
 			  DA9052_ADC_VDDOUT);
 static SENSOR_DEVICE_ATTR(in0_label, 0444, show_label, NULL,
@@ -221,6 +352,23 @@  static SENSOR_DEVICE_ATTR(in9_input, 0444, da9052_read_vbbat, NULL,
 static SENSOR_DEVICE_ATTR(in9_label, 0444, show_label, NULL,
 			  DA9052_ADC_VBBAT);
 
+static SENSOR_DEVICE_ATTR(in70_input, 0444, da9052_read_tsi, NULL,
+			  DA9052_ADC_TSI_XP);
+static SENSOR_DEVICE_ATTR(in70_label, 0444, show_label, NULL,
+			  DA9052_ADC_TSI_XP);
+static SENSOR_DEVICE_ATTR(in71_input, 0444, da9052_read_tsi, NULL,
+			  DA9052_ADC_TSI_XN);
+static SENSOR_DEVICE_ATTR(in71_label, 0444, show_label, NULL,
+			  DA9052_ADC_TSI_XN);
+static SENSOR_DEVICE_ATTR(in72_input, 0444, da9052_read_tsi, NULL,
+			  DA9052_ADC_TSI_YP);
+static SENSOR_DEVICE_ATTR(in72_label, 0444, show_label, NULL,
+			  DA9052_ADC_TSI_YP);
+static SENSOR_DEVICE_ATTR(in73_input, 0444, da9052_read_tsi, NULL,
+			  DA9052_ADC_TSI_YN);
+static SENSOR_DEVICE_ATTR(in73_label, 0444, show_label, NULL,
+			  DA9052_ADC_TSI_YN);
+
 static SENSOR_DEVICE_ATTR(curr1_input, 0444, da9052_read_ich, NULL,
 			  DA9052_ADC_ICH);
 static SENSOR_DEVICE_ATTR(curr1_label, 0444, show_label, NULL,
@@ -246,6 +394,14 @@  static struct attribute *da9052_attrs[] = {
 	&sensor_dev_attr_in5_label.dev_attr.attr,
 	&sensor_dev_attr_in6_input.dev_attr.attr,
 	&sensor_dev_attr_in6_label.dev_attr.attr,
+	&sensor_dev_attr_in70_input.dev_attr.attr,
+	&sensor_dev_attr_in70_label.dev_attr.attr,
+	&sensor_dev_attr_in71_input.dev_attr.attr,
+	&sensor_dev_attr_in71_label.dev_attr.attr,
+	&sensor_dev_attr_in72_input.dev_attr.attr,
+	&sensor_dev_attr_in72_label.dev_attr.attr,
+	&sensor_dev_attr_in73_input.dev_attr.attr,
+	&sensor_dev_attr_in73_label.dev_attr.attr,
 	&sensor_dev_attr_in9_input.dev_attr.attr,
 	&sensor_dev_attr_in9_label.dev_attr.attr,
 	&sensor_dev_attr_curr1_input.dev_attr.attr,
@@ -257,29 +413,117 @@  static struct attribute *da9052_attrs[] = {
 	NULL
 };
 
-ATTRIBUTE_GROUPS(da9052);
+static const struct attribute_group da9052_group = {
+	.attrs = da9052_attrs,
+	.is_visible = da9052_channel_is_visible,
+};
+__ATTRIBUTE_GROUPS(da9052);
+
+static irqreturn_t da9052_tsi_datardy_irq(int irq, void *data)
+{
+	struct da9052_hwmon *hwmon = data;
+
+	complete(&hwmon->tsidone);
+	return IRQ_HANDLED;
+}
 
 static int da9052_hwmon_probe(struct platform_device *pdev)
 {
 	struct device *dev = &pdev->dev;
 	struct da9052_hwmon *hwmon;
 	struct device *hwmon_dev;
+	int err;
 
 	hwmon = devm_kzalloc(dev, sizeof(struct da9052_hwmon), GFP_KERNEL);
 	if (!hwmon)
 		return -ENOMEM;
 
+	platform_set_drvdata(pdev, hwmon);
+
 	mutex_init(&hwmon->hwmon_lock);
 	hwmon->da9052 = dev_get_drvdata(pdev->dev.parent);
 
+	init_completion(&hwmon->tsidone);
+
+	hwmon->tsi_as_adc =
+		device_property_read_bool(pdev->dev.parent, "diag,tsi-as-adc");
+
+	if (hwmon->tsi_as_adc) {
+		hwmon->tsiref = devm_regulator_get(pdev->dev.parent, "tsiref");
+		if (IS_ERR(hwmon->tsiref)) {
+			err = PTR_ERR(hwmon->tsiref);
+			dev_err(&pdev->dev, "failed to get tsiref: %d", err);
+			return err;
+		}
+
+		err = regulator_enable(hwmon->tsiref);
+		if (err)
+			return err;
+
+		hwmon->tsiref_mv = regulator_get_voltage(hwmon->tsiref);
+		if (hwmon->tsiref_mv < 0) {
+			err = hwmon->tsiref_mv;
+			goto exit_regulator;
+		}
+
+		/* convert from microvolt (DT) to millivolt (hwmon) */
+		hwmon->tsiref_mv /= 1000;
+
+		/* TSIREF limits from datasheet */
+		if (hwmon->tsiref_mv < 1800 || hwmon->tsiref_mv > 2600) {
+			dev_err(hwmon->da9052->dev, "invalid TSIREF voltage: %d",
+				hwmon->tsiref_mv);
+			err = -ENXIO;
+			goto exit_regulator;
+		}
+
+		/* disable touchscreen features */
+		da9052_reg_write(hwmon->da9052, DA9052_TSI_CONT_A_REG, 0x00);
+
+		err = da9052_request_irq(hwmon->da9052, DA9052_IRQ_TSIREADY,
+					 "tsiready-irq", da9052_tsi_datardy_irq,
+					 hwmon);
+		if (err) {
+			dev_err(&pdev->dev, "Failed to register TSIRDY IRQ: %d",
+				err);
+			goto exit_regulator;
+		}
+	}
+
 	hwmon_dev = devm_hwmon_device_register_with_groups(dev, "da9052",
 							   hwmon,
 							   da9052_groups);
-	return PTR_ERR_OR_ZERO(hwmon_dev);
+	err = PTR_ERR_OR_ZERO(hwmon_dev);
+	if (err)
+		goto exit_irq;
+
+	return 0;
+
+exit_irq:
+	if (hwmon->tsi_as_adc)
+		da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
+exit_regulator:
+	if (hwmon->tsiref)
+		regulator_disable(hwmon->tsiref);
+
+	return err;
+}
+
+static int da9052_hwmon_remove(struct platform_device *pdev)
+{
+	struct da9052_hwmon *hwmon = platform_get_drvdata(pdev);
+
+	if (hwmon->tsi_as_adc) {
+		da9052_free_irq(hwmon->da9052, DA9052_IRQ_TSIREADY, hwmon);
+		regulator_disable(hwmon->tsiref);
+	}
+
+	return 0;
 }
 
 static struct platform_driver da9052_hwmon_driver = {
 	.probe = da9052_hwmon_probe,
+	.remove = da9052_hwmon_remove,
 	.driver = {
 		.name = "da9052-hwmon",
 	},
diff --git a/drivers/input/touchscreen/da9052_tsi.c b/drivers/input/touchscreen/da9052_tsi.c
index 5a013bb7bcad..f0cb239546a9 100644
--- a/drivers/input/touchscreen/da9052_tsi.c
+++ b/drivers/input/touchscreen/da9052_tsi.c
@@ -16,6 +16,7 @@ 
 #include <linux/delay.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
+#include <linux/property.h>
 
 #include <linux/mfd/da9052/reg.h>
 #include <linux/mfd/da9052/da9052.h>
@@ -238,6 +239,10 @@  static int da9052_ts_probe(struct platform_device *pdev)
 	if (!da9052)
 		return -EINVAL;
 
+	/* check if pins are used as general purpose ADC input */
+	if (device_property_read_bool(pdev->dev.parent, "diag,tsi-as-adc"))
+		return -ENODEV;
+
 	tsi = kzalloc(sizeof(struct da9052_tsi), GFP_KERNEL);
 	input_dev = input_allocate_device();
 	if (!tsi || !input_dev) {
diff --git a/include/linux/mfd/da9052/da9052.h b/include/linux/mfd/da9052/da9052.h
index ce9230af09c2..ae5b663836d0 100644
--- a/include/linux/mfd/da9052/da9052.h
+++ b/include/linux/mfd/da9052/da9052.h
@@ -45,6 +45,12 @@ 
 #define DA9052_ADC_TJUNC	8
 #define DA9052_ADC_VBBAT	9
 
+/* TSI channel has its own 4 channel mux */
+#define DA9052_ADC_TSI_XP	70
+#define DA9052_ADC_TSI_XN	71
+#define DA9052_ADC_TSI_YP	72
+#define DA9052_ADC_TSI_YN	73
+
 #define DA9052_IRQ_DCIN	0
 #define DA9052_IRQ_VBUS	1
 #define DA9052_IRQ_DCINREM	2