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SubjectRe: [PATCH v3 5/9] iio: tsl2772: add support for regulator framework
On Thu,  2 Aug 2018 20:18:56 -0400
Brian Masney <masneyb@onstation.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@onstation.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);
> }

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