Add device tree based support for TI's tps6507x touchscreen.
Signed-off-by: Manish Badarkhe <badarkhe.manish@xxxxxxxxx>
---
Changes since V3:
- Rebased on top of Dmitry's changes
- Removed error handling for optional DT properties
Changes since V2:
- Removed unnecessary code.
- Updated Documentation to provide proper names of
devicetree properties.
Changes since V1:
- Updated documentation to specify tps6507x as multifunctional
device.
- return proper error value in absence of platform and DT
data for touchscreen.
- Updated commit message.
:100755 100755 8fffa3c... e1b9cfd... M Documentation/devicetree/bindings/mfd/tps6507x.txt
:100644 100644 db604e0... 0cf0eb1... M drivers/input/touchscreen/tps6507x-ts.c
Documentation/devicetree/bindings/mfd/tps6507x.txt | 24 ++++++-
drivers/input/touchscreen/tps6507x-ts.c | 72 ++++++++++++--------
2 files changed, 67 insertions(+), 29 deletions(-)
diff --git a/Documentation/devicetree/bindings/mfd/tps6507x.txt b/Documentation/devicetree/bindings/mfd/tps6507x.txt
index 8fffa3c..e1b9cfd 100755
--- a/Documentation/devicetree/bindings/mfd/tps6507x.txt
+++ b/Documentation/devicetree/bindings/mfd/tps6507x.txt
@@ -1,4 +1,8 @@
-TPS6507x Power Management Integrated Circuit
+TPS6507x Multifunctional Device.
+
+Features provided by TPS6507x:
+ 1.Power Management Integrated Circuit.
+ 2.Touch-Screen.
Required properties:
- compatible: "ti,tps6507x"
@@ -23,6 +27,9 @@ Required properties:
vindcdc1_2-supply: VDCDC1 and VDCDC2 input.
vindcdc3-supply : VDCDC3 input.
vldo1_2-supply : VLDO1 and VLDO2 input.
+- tsc: This node specifies touch screen data.
+ ti,poll-period : Time at which touch input is getting sampled in ms.
+ ti,min-pressure: Minimum pressure value to trigger touch.
Regulator Optional properties:
- defdcdc_default: It's property of DCDC2 and DCDC3 regulators.
@@ -30,6 +37,14 @@ Regulator Optional properties:
1: If defdcdc pin of DCDC2/DCDC3 is driven HIGH.
If this property is not defined, it defaults to 0 (not enabled).
+Touchscreen Optional properties:
+- ti,vendor : Touchscreen vendor id to populate
+ in sysclass interface.
+- ti,product: Touchscreen product id to populate
+ in sysclass interface.
+- ti,version: Touchscreen version id to populate
+ in sysclass interface.
+
Example:
pmu: tps6507x@48 {
@@ -88,4 +103,11 @@ Example:
};
};
+ tsc {
+ ti,poll-period = <30>;
+ ti,min-pressure = <0x30>;
+ ti,vendor = <0>;
+ ti,product = <65070>;
+ ti,version = <0x100>;
+ };
};
diff --git a/drivers/input/touchscreen/tps6507x-ts.c b/drivers/input/touchscreen/tps6507x-ts.c
index db604e0..0cf0eb1 100644
--- a/drivers/input/touchscreen/tps6507x-ts.c
+++ b/drivers/input/touchscreen/tps6507x-ts.c
@@ -22,6 +22,8 @@
#include <linux/mfd/tps6507x.h>
#include <linux/input/tps6507x-ts.h>
#include <linux/delay.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
#define TSC_DEFAULT_POLL_PERIOD 30 /* ms */
#define TPS_DEFAULT_MIN_PRESSURE 0x30
@@ -206,33 +208,54 @@ done:
tps6507x_adc_standby(tsc);
}
+static void tsc_init_data(struct tps6507x_ts *tsc,
+ struct input_dev *input_dev)
+{
+ struct device_node *node = tsc->dev->of_node;
+ const struct tps6507x_board *tps_board =
+ dev_get_platdata(tsc->dev);
+ const struct touchscreen_init_data *init_data = NULL;
+
+ if (node)
+ node = of_find_node_by_name(node, "tsc");
+ if (tps_board)
+ /*
+ * init_data points to array of touchscreen_init structure
+ * coming from the board-evm file.
+ */
+ init_data = tps_board->tps6507x_ts_init_data;
+
+ if (node == NULL || init_data == NULL) {
+ tsc->poll_dev->poll_interval = TSC_DEFAULT_POLL_PERIOD;
+ tsc->min_pressure = TPS_DEFAULT_MIN_PRESSURE;
+ } else if (init_data) {
+ tsc->poll_dev->poll_interval = init_data->poll_period;
+ tsc->min_pressure = init_data->min_pressure;
+ input_dev->id.vendor = init_data->vendor;
+ input_dev->id.product = init_data->product;
+ input_dev->id.version = init_data->version;
+ } else if (node) {
+ of_property_read_u32(node, "ti,poll-period",
+ &tsc->poll_dev->poll_interval);
+ of_property_read_u16(node, "ti,min-pressure",
+ &tsc->min_pressure);
+ of_property_read_u16(node, "ti,vendor",
+ &input_dev->id.vendor);
+ of_property_read_u16(node, "ti,product",
+ &input_dev->id.product);
+ of_property_read_u16(node, "ti,version",
+ &input_dev->id.version);
+ }
+}
+
static int tps6507x_ts_probe(struct platform_device *pdev)
{
struct tps6507x_dev *tps6507x_dev = dev_get_drvdata(pdev->dev.parent);
- const struct tps6507x_board *tps_board;
- const struct touchscreen_init_data *init_data;
struct tps6507x_ts *tsc;
struct input_polled_dev *poll_dev;
struct input_dev *input_dev;
int error;
- /*
- * tps_board points to pmic related constants
- * coming from the board-evm file.
- */
- tps_board = dev_get_platdata(tps6507x_dev->dev);
- if (!tps_board) {
- dev_err(tps6507x_dev->dev,
- "Could not find tps6507x platform data\n");
- return -ENODEV;
- }
-
- /*
- * init_data points to array of regulator_init structures
- * coming from the board-evm file.
- */
- init_data = tps_board->tps6507x_ts_init_data;
-
tsc = devm_kzalloc(&pdev->dev, sizeof(struct tps6507x_ts), GFP_KERNEL);
if (!tsc) {
dev_err(tps6507x_dev->dev, "failed to allocate driver data\n");
@@ -241,8 +264,6 @@ static int tps6507x_ts_probe(struct platform_device *pdev)
tsc->mfd = tps6507x_dev;
tsc->dev = tps6507x_dev->dev;
- tsc->min_pressure = init_data ?
- init_data->min_pressure : TPS_DEFAULT_MIN_PRESSURE;
snprintf(tsc->phys, sizeof(tsc->phys),
"%s/input0", dev_name(tsc->dev));
@@ -258,8 +279,6 @@ static int tps6507x_ts_probe(struct platform_device *pdev)
poll_dev->private = tsc;
poll_dev->poll = tps6507x_ts_poll;
- poll_dev->poll_interval = init_data ?
- init_data->poll_period : TSC_DEFAULT_POLL_PERIOD;
input_dev = poll_dev->input;
input_dev->evbit[0] = BIT_MASK(EV_KEY) | BIT_MASK(EV_ABS);
@@ -273,11 +292,8 @@ static int tps6507x_ts_probe(struct platform_device *pdev)
input_dev->phys = tsc->phys;
input_dev->dev.parent = tsc->dev;
input_dev->id.bustype = BUS_I2C;
- if (init_data) {
- input_dev->id.vendor = init_data->vendor;
- input_dev->id.product = init_data->product;
- input_dev->id.version = init_data->version;
- }
+
+ tsc_init_data(tsc, input_dev);
error = tps6507x_adc_standby(tsc);
if (error)
--
1.7.10.4
--
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