[PATCH 2/7] Input: cyttsp - Obtain regulators

[Linus Walleij <linus.walleij@linaro.org>]

The CYTTSP TMA340 chips have two supplies: VCPIN and
VDD for analog and digital voltage respectively.
Add some minimal code to obtain and enable these
regulators if need be.

Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
---
 drivers/input/touchscreen/cyttsp_core.c | 30 +++++++++++++++++++++++--
 drivers/input/touchscreen/cyttsp_core.h |  2 ++
 2 files changed, 30 insertions(+), 2 deletions(-)

diff --git a/drivers/input/touchscreen/cyttsp_core.c b/drivers/input/touchscreen/cyttsp_core.c
index b9772192b5ea..a19d7cce95ca 100644
--- a/drivers/input/touchscreen/cyttsp_core.c
+++ b/drivers/input/touchscreen/cyttsp_core.c
@@ -22,6 +22,7 @@
 #include <linux/slab.h>
 #include <linux/property.h>
 #include <linux/gpio/consumer.h>
+#include <linux/regulator/consumer.h>
 
 #include "cyttsp_core.h"
 
@@ -621,6 +622,19 @@ struct cyttsp *cyttsp_probe(const struct cyttsp_bus_ops *bus_ops,
 	ts->bus_ops = bus_ops;
 	ts->irq = irq;
 
+	/*
+	 * VCPIN is the analog voltage supply
+	 * VDD is the digital voltage supply
+	 */
+	ts->regulators[0].supply = "vcpin";
+	ts->regulators[1].supply = "vdd";
+	error = devm_regulator_bulk_get(dev, ARRAY_SIZE(ts->regulators),
+					ts->regulators);
+	if (error) {
+		dev_err(dev, "Failed to get regulators: %d\n", error);
+		return ERR_PTR(error);
+	}
+
 	ts->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW);
 	if (IS_ERR(ts->reset_gpio)) {
 		error = PTR_ERR(ts->reset_gpio);
@@ -666,20 +680,32 @@ struct cyttsp *cyttsp_probe(const struct cyttsp_bus_ops *bus_ops,
 
 	disable_irq(ts->irq);
 
+	error = regulator_bulk_enable(ARRAY_SIZE(ts->regulators),
+				      ts->regulators);
+	if (error) {
+		dev_err(dev, "Cannot enable regulators: %d\n", error);
+		return ERR_PTR(error);
+	}
+
 	cyttsp_hard_reset(ts);
 
 	error = cyttsp_power_on(ts);
 	if (error)
-		return ERR_PTR(error);
+		goto err_dis_reg;
 
 	error = input_register_device(input_dev);
 	if (error) {
 		dev_err(ts->dev, "failed to register input device: %d\n",
 			error);
-		return ERR_PTR(error);
+		goto err_dis_reg;
 	}
 
 	return ts;
+
+err_dis_reg:
+	regulator_bulk_disable(ARRAY_SIZE(ts->regulators),
+			       ts->regulators);
+	return ERR_PTR(error);
 }
 EXPORT_SYMBOL_GPL(cyttsp_probe);
 
diff --git a/drivers/input/touchscreen/cyttsp_core.h b/drivers/input/touchscreen/cyttsp_core.h
index 8c651336ac12..c102a094e888 100644
--- a/drivers/input/touchscreen/cyttsp_core.h
+++ b/drivers/input/touchscreen/cyttsp_core.h
@@ -23,6 +23,7 @@
 #include <linux/types.h>
 #include <linux/device.h>
 #include <linux/input/cyttsp.h>
+#include <linux/regulator/consumer.h>
 
 #define CY_NUM_RETRY		16 /* max number of retries for read ops */
 
@@ -123,6 +124,7 @@ struct cyttsp {
 	enum cyttsp_state state;
 	bool suspended;
 
+	struct regulator_bulk_data regulators[2];
 	struct gpio_desc *reset_gpio;
 	bool use_hndshk;
 	u8 act_dist;
-- 
2.29.2