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iio: tsl2772: add support for regulator framework 

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>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
This commit is contained in:
Brian Masney 2018-08-02 20:18:56 -04:00 committed by Jonathan Cameron
parent 75de3b570b
commit 7c14947e4d
1 changed files with 94 additions and 1 deletions
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95
drivers/iio/light/tsl2772.c
View File

@ -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
@ -109,6 +110,9 @@
#define TSL2772_MAX_PROX_LEDS 2
#define TSL2772_BOOT_MIN_SLEEP_TIME 10000
#define TSL2772_BOOT_MAX_SLEEP_TIME 28000
/* Device family members */
enum {
tsl2571,
@ -157,6 +161,8 @@ struct tsl2772_chip {
struct mutex prox_mutex;
struct mutex als_mutex;
struct i2c_client *client;
struct regulator *vdd_supply;
struct regulator *vddio_supply;
u16 prox_data;
struct tsl2772_als_info als_cur_info;
struct tsl2772_settings settings;
@ -687,6 +693,52 @@ static int tsl2772_als_calibrate(struct iio_dev *indio_dev)
return ret;
}
static void tsl2772_disable_regulators_action(void *_data)
{
struct tsl2772_chip *chip = _data;
regulator_disable(chip->vdd_supply);
regulator_disable(chip->vddio_supply);
}
static int tsl2772_enable_regulator(struct tsl2772_chip *chip,
struct regulator *regulator)
{
int ret;
ret = regulator_enable(regulator);
if (ret < 0) {
dev_err(&chip->client->dev, "Failed to enable regulator: %d\n",
ret);
return ret;
}
return 0;
}
static struct regulator *tsl2772_get_regulator(struct tsl2772_chip *chip,
char *name)
{
struct regulator *regulator;
int ret;
regulator = devm_regulator_get(&chip->client->dev, name);
if (IS_ERR(regulator)) {
if (PTR_ERR(regulator) != -EPROBE_DEFER)
dev_err(&chip->client->dev,
"Failed to get %s regulator %d\n",
name, (int)PTR_ERR(regulator));
return regulator;
}
ret = tsl2772_enable_regulator(chip, regulator);
if (ret < 0)
return ERR_PTR(ret);
return regulator;
}
static int tsl2772_chip_on(struct iio_dev *indio_dev)
{
struct tsl2772_chip *chip = iio_priv(indio_dev);
@ -1745,6 +1797,27 @@ static int tsl2772_probe(struct i2c_client *clientp,
chip->client = clientp;
i2c_set_clientdata(clientp, indio_dev);
chip->vddio_supply = tsl2772_get_regulator(chip, "vddio");
if (IS_ERR(chip->vddio_supply))
return PTR_ERR(chip->vddio_supply);
chip->vdd_supply = tsl2772_get_regulator(chip, "vdd");
if (IS_ERR(chip->vdd_supply)) {
regulator_disable(chip->vddio_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;
}
usleep_range(TSL2772_BOOT_MIN_SLEEP_TIME, TSL2772_BOOT_MAX_SLEEP_TIME);
ret = i2c_smbus_read_byte_data(chip->client,
TSL2772_CMD_REG | TSL2772_CHIPID);
if (ret < 0)
@ -1818,13 +1891,33 @@ static int tsl2772_probe(struct i2c_client *clientp,
static int tsl2772_suspend(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2772_chip *chip = iio_priv(indio_dev);
int ret;
return tsl2772_chip_off(indio_dev);
ret = tsl2772_chip_off(indio_dev);
regulator_disable(chip->vdd_supply);
regulator_disable(chip->vddio_supply);
return ret;
}
static int tsl2772_resume(struct device *dev)
{
struct iio_dev *indio_dev = dev_get_drvdata(dev);
struct tsl2772_chip *chip = iio_priv(indio_dev);
int ret;
ret = tsl2772_enable_regulator(chip, chip->vddio_supply);
if (ret < 0)
return ret;
ret = tsl2772_enable_regulator(chip, chip->vdd_supply);
if (ret < 0) {
regulator_disable(chip->vddio_supply);
return ret;
}
usleep_range(TSL2772_BOOT_MIN_SLEEP_TIME, TSL2772_BOOT_MAX_SLEEP_TIME);
return tsl2772_chip_on(indio_dev);
}