[PATCH v3 1/3] Input: edt-ft5x06 - Add support for regulator

[Mylène Josserand]

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

Signed-off-by: Mylène Josserand <mylene.josser...@bootlin.com>
---
 .../bindings/input/touchscreen/edt-ft5x06.txt      |  1 +
 drivers/input/touchscreen/edt-ft5x06.c             | 29 ++++++++++++++++++++++
 2 files changed, 30 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 1e18ca0d1b4e..aa94494b06b5 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;
@@ -991,6 +993,22 @@ 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);
+               if (error != -EPROBE_DEFER)
+                       dev_err(&client->dev, "failed to request regulator: 
%d\n",
+                               error);
+               return error;
+       }
+
+       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)) {
@@ -1120,20 +1138,31 @@ 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);
 
+       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);
 
+       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