linux-kernel - Re: [PATCH v3 5/9] iio: tsl2772: add support for regulator framework

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Date:   Fri, 3 Aug 2018 22:50:17 +0100
From:   Jonathan Cameron <jic23@...nel.org>
To:     Brian Masney <masneyb@...tation.org>
Cc:     robh+dt@...nel.org, mark.rutland@....com, andy.gross@...aro.org,
        david.brown@...aro.org, linux-iio@...r.kernel.org,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        jonathan@...ek.ca, jmaneyrol@...ensense.com, knaack.h@....de,
        lars@...afoo.de, pmeerw@...erw.net, mkelly@...o.com,
        fischerdouglasc@...il.com, bshah@....org, ctatlor97@...il.com
Subject: Re: [PATCH v3 5/9] iio: tsl2772: add support for regulator
 framework

On Thu,  2 Aug 2018 20:18:56 -0400
Brian Masney <masneyb@...tation.org> wrote:

> 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@...tation.org>
This looks fine, but will wait for the precursors.

Jonathan

> ---
>  drivers/iio/light/tsl2772.c | 95 ++++++++++++++++++++++++++++++++++++-
>  1 file changed, 94 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iio/light/tsl2772.c b/drivers/iio/light/tsl2772.c
> index ae00edf0d87e..4a11bf77a4d0 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
> @@ -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,
> @@ -156,6 +160,8 @@ 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;
> @@ -676,6 +682,52 @@ 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);
> @@ -1733,6 +1785,27 @@ 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)
> @@ -1806,13 +1879,33 @@ 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);
>  }