[PATCH v2 1/2] Input: edt-ft5x06 - Add support for regulator

Mylène Josserand
2017-12-28T16:33:35Z

Add the support of regulator to use it as VCC source.

Signed-off-by: Myl?ne Josserand <mylene.josserand@free-electrons.com>
---
.../bindings/input/touchscreen/edt-ft5x06.txt | 1 +
drivers/input/touchscreen/edt-ft5x06.c | 33 ++++++++++++++++++++++
2 files changed, 34 insertions(+)

diff --git a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
index 025cf8c9324a..48e975b9c1aa 100644
--- a/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
+++ b/Documentation/devicetree/bindings/input/touchscreen/edt-ft5x06.txt
@@ -30,6 +30,7 @@ Required properties:
Optional properties:
- reset-gpios: GPIO specification for the RESET input
- wake-gpios: GPIO specification for the WAKE input
+ - vcc-supply: Regulator that supplies the touchscreen

- pinctrl-names: should be "default"
- pinctrl-0: a phandle pointing to the pin settings for the
diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c
index c53a3d7239e7..5ee14a25a382 100644
--- a/drivers/input/touchscreen/edt-ft5x06.c
+++ b/drivers/input/touchscreen/edt-ft5x06.c
@@ -39,6 +39,7 @@
#include <linux/input/mt.h>
#include <linux/input/touchscreen.h>
#include <linux/of_device.h>
+#include <linux/regulator/consumer.h>

#define WORK_REGISTER_THRESHOLD 0x00
#define WORK_REGISTER_REPORT_RATE 0x08
@@ -91,6 +92,7 @@ struct edt_ft5x06_ts_data {
struct touchscreen_properties prop;
u16 num_x;
u16 num_y;
+ struct regulator *vcc;

struct gpio_desc *reset_gpio;
struct gpio_desc *wake_gpio;
@@ -993,6 +995,23 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client,

tsdata->max_support_points = chip_data->max_support_points;

+ tsdata->vcc = devm_regulator_get(&client->dev, "vcc");
+ if (IS_ERR(tsdata->vcc)) {
+ error = PTR_ERR(tsdata->vcc);
+ dev_err(&client->dev, "failed to request regulator: %d\n",
+ error);
+ return error;
+ };
+
+ if (tsdata->vcc) {
+ error = regulator_enable(tsdata->vcc);
+ if (error < 0) {
+ dev_err(&client->dev, "failed to enable vcc: %d\n",
+ error);
+ return error;
+ }
+ }
+
tsdata->reset_gpio = devm_gpiod_get_optional(&client->dev,
"reset", GPIOD_OUT_HIGH);
if (IS_ERR(tsdata->reset_gpio)) {
@@ -1122,20 +1141,34 @@ static int edt_ft5x06_ts_remove(struct i2c_client *client)
static int __maybe_unused edt_ft5x06_ts_suspend(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
+ struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);

if (device_may_wakeup(dev))
enable_irq_wake(client->irq);

+ if (tsdata->vcc)
+ regulator_disable(tsdata->vcc);
+
return 0;
}

static int __maybe_unused edt_ft5x06_ts_resume(struct device *dev)
{
struct i2c_client *client = to_i2c_client(dev);
+ struct edt_ft5x06_ts_data *tsdata = i2c_get_clientdata(client);
+ int ret;

if (device_may_wakeup(dev))
disable_irq_wake(client->irq);

+ if (tsdata->vcc) {
+ ret = regulator_enable(tsdata->vcc);
+ if (ret < 0) {
+ dev_err(dev, "failed to enable vcc: %d\n", ret);
+ return ret;
+ }
+ }
+
return 0;
}

--
2.11.0