[PATCH v2 5/7] iio: tsl2772: add support for regulator framework

Brian Masney
2018-07-17T08:42:26Z

This patch adds support for the regulator framework to the tsl2772
driver. Driver was tested using a LG Nexus 5 (hammerhead) phone with
the two regulators and on a Raspberry Pi 2 without any regulators
controlling the power to the sensor.

Signed-off-by: Brian Masney <masneyb@onstation.org>
---
.../devicetree/bindings/iio/light/tsl2772.txt | 4 +
drivers/iio/light/tsl2772.c | 82 ++++++++++++++++++-
2 files changed, 85 insertions(+), 1 deletion(-)

diff --git a/Documentation/devicetree/bindings/iio/light/tsl2772.txt b/Documentation/devicetree/bindings/iio/light/tsl2772.txt
index ab553d52b9fc..bfde8b2c8790 100644
--- a/Documentation/devicetree/bindings/iio/light/tsl2772.txt
+++ b/Documentation/devicetree/bindings/iio/light/tsl2772.txt
@@ -21,6 +21,8 @@ Optional properties:
TSL2772_DIODE_BOTH.
- amstaos,prox_power - must be TSL2772_100_mA, TSL2772_50_mA, TSL2772_25_mA,
or TSL2772_13_mA.
+ - vdd-supply: phandle to the regulator that provides power to the sensor.
+ - vddio-supply: phandle to the regulator that provides power to the bus.
- interrupt-parent: should be the phandle for the interrupt controller
- interrupts: the sole interrupt generated by the device

@@ -35,5 +37,7 @@ tsl2772@39 {
compatible = "amstaos,tsl2772";
reg = <0x39>;
interrupts-extended = <&msmgpio 61 IRQ_TYPE_EDGE_FALLING>;
+ vdd-supply = <&pm8941_l17>;
+ vddio-supply = <&pm8941_lvs1>;
amstaos,prox_diode = <TSL2772_DIODE0>;
};
diff --git a/drivers/iio/light/tsl2772.c b/drivers/iio/light/tsl2772.c
index 0be57f2ecb02..f6a27f8b3ca7 100644
--- a/drivers/iio/light/tsl2772.c
+++ b/drivers/iio/light/tsl2772.c
@@ -20,6 +20,7 @@
#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
#include <linux/platform_data/tsl2772.h>
+#include <linux/regulator/consumer.h>

/* Cal defs */
#define PROX_STAT_CAL 0
@@ -146,6 +147,9 @@ struct tsl2772_chip {
struct mutex prox_mutex;
struct mutex als_mutex;
struct i2c_client *client;
+ struct regulator *vdd_supply;
+ struct regulator *vddio_supply;
+ bool regulators_enabled;
u16 prox_data;
struct tsl2772_als_info als_cur_info;
struct tsl2772_settings settings;
@@ -609,6 +613,46 @@ static int tsl2772_als_calibrate(struct iio_dev *indio_dev)
return ret;
}

+static int tsl2772_enable_regulators(struct tsl2772_chip *chip)
+{
+ int ret;
+
+ ret = regulator_enable(chip->vddio_supply);
+ if (ret < 0) {
+ dev_err(&chip->client->dev, "Failed to enable regulator: %d\n",
+ ret);
+ return ret;
+ }
+
+ ret = regulator_enable(chip->vdd_supply);
+ if (ret < 0) {
+ regulator_disable(chip->vddio_supply);
+ dev_err(&chip->client->dev, "Failed to enable regulator: %d\n",
+ ret);
+ return ret;
+ }
+
+ chip->regulators_enabled = true;
+
+ return 0;
+}
+
+static void tsl2772_disable_regulators(struct tsl2772_chip *chip)
+{
+ if (!chip->regulators_enabled)
+ return;
+
+ regulator_disable(chip->vdd_supply);
+ regulator_disable(chip->vddio_supply);
+
+ chip->regulators_enabled = false;
+}
+
+static void tsl2772_disable_regulators_action(void *_data)
+{
+ tsl2772_disable_regulators(_data);
+}
+
static int tsl2772_chip_on(struct iio_dev *indio_dev)
{
struct tsl2772_chip *chip = iio_priv(indio_dev);
@@ -666,6 +710,10 @@ static int tsl2772_chip_on(struct iio_dev *indio_dev)
chip->als_gain_time_scale = als_time_us *
tsl2772_als_gain[chip->settings.als_gain];

+ ret = tsl2772_enable_regulators(chip);
+ if (ret < 0)
+ return ret;
+
/*
* TSL2772 Specific power-on / adc enable sequence
* Power on the device 1st.
@@ -724,10 +772,13 @@ static int tsl2772_chip_on(struct iio_dev *indio_dev)
static int tsl2772_chip_off(struct iio_dev *indio_dev)
{
struct tsl2772_chip *chip = iio_priv(indio_dev);
+ int ret;

/* turn device off */
chip->tsl2772_chip_status = TSL2772_CHIP_SUSPENDED;
- return tsl2772_write_control_reg(chip, 0x00);
+ ret = tsl2772_write_control_reg(chip, 0x00);
+ tsl2772_disable_regulators(chip);
+ return ret;
}

/**
@@ -1666,6 +1717,35 @@ static int tsl2772_probe(struct i2c_client *clientp,
chip->client = clientp;
i2c_set_clientdata(clientp, indio_dev);

+ chip->vddio_supply = devm_regulator_get(&clientp->dev, "vddio");
+ if (IS_ERR(chip->vddio_supply)) {
+ if (PTR_ERR(chip->vddio_supply) != -EPROBE_DEFER)
+ dev_err(&clientp->dev,
+ "Failed to get vddio regulator %d\n",
+ (int)PTR_ERR(chip->vddio_supply));
+
+ return PTR_ERR(chip->vddio_supply);
+ }
+
+ chip->vdd_supply = devm_regulator_get(&clientp->dev, "vdd");
+ if (IS_ERR(chip->vdd_supply)) {
+ if (PTR_ERR(chip->vdd_supply) != -EPROBE_DEFER)
+ dev_err(&clientp->dev,
+ "Failed to get vdd regulator %d\n",
+ (int)PTR_ERR(chip->vdd_supply));
+
+ return PTR_ERR(chip->vdd_supply);
+ }
+
+ ret = devm_add_action(&clientp->dev, tsl2772_disable_regulators_action,
+ chip);
+ if (ret < 0) {
+ tsl2772_disable_regulators_action(chip);
+ dev_err(&clientp->dev, "Failed to setup regulator cleanup action %d\n",
+ ret);
+ return ret;
+ }
+
ret = i2c_smbus_read_byte_data(chip->client,
TSL2772_CMD_REG | TSL2772_CHIPID);
if (ret < 0)
--
2.17.1