diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/iio/light/isl29018.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/drivers/staging/iio/light/isl29018.c b/drivers/staging/iio/light/isl29018.c index 6ee5567d9813..3b03f6f5c40c 100644 --- a/drivers/staging/iio/light/isl29018.c +++ b/drivers/staging/iio/light/isl29018.c @@ -67,6 +67,7 @@ struct isl29018_chip { unsigned int range; unsigned int adc_bit; int prox_scheme; + bool suspended; }; static int isl29018_set_range(struct isl29018_chip *chip, unsigned long range, @@ -368,6 +369,10 @@ static int isl29018_read_raw(struct iio_dev *indio_dev, struct isl29018_chip *chip = iio_priv(indio_dev); mutex_lock(&chip->lock); + if (chip->suspended) { + mutex_unlock(&chip->lock); + return -EBUSY; + } switch (mask) { case IIO_CHAN_INFO_RAW: case IIO_CHAN_INFO_PROCESSED: @@ -561,6 +566,7 @@ static int __devinit isl29018_probe(struct i2c_client *client, chip->lux_scale = 1; chip->range = 1000; chip->adc_bit = 16; + chip->suspended = false; chip->regmap = devm_regmap_init_i2c(client, &isl29018_regmap_config); if (IS_ERR(chip->regmap)) { @@ -603,6 +609,44 @@ static int __devexit isl29018_remove(struct i2c_client *client) return 0; } +#ifdef CONFIG_PM_SLEEP +static int isl29018_suspend(struct device *dev) +{ + struct isl29018_chip *chip = iio_priv(dev_get_drvdata(dev)); + + mutex_lock(&chip->lock); + + /* Since this driver uses only polling commands, we are by default in + * auto shutdown (ie, power-down) mode. + * So we do not have much to do here. + */ + chip->suspended = true; + + mutex_unlock(&chip->lock); + return 0; +} + +static int isl29018_resume(struct device *dev) +{ + struct isl29018_chip *chip = iio_priv(dev_get_drvdata(dev)); + int err; + + mutex_lock(&chip->lock); + + err = isl29018_chip_init(chip); + if (!err) + chip->suspended = false; + + mutex_unlock(&chip->lock); + return err; +} + +static SIMPLE_DEV_PM_OPS(isl29018_pm_ops, isl29018_suspend, isl29018_resume); +#define ISL29018_PM_OPS (&isl29018_pm_ops) +#else +#define ISL29018_PM_OPS NULL +#endif + static const struct i2c_device_id isl29018_id[] = { {"isl29018", 0}, {} @@ -620,6 +664,7 @@ static struct i2c_driver isl29018_driver = { .class = I2C_CLASS_HWMON, .driver = { .name = "isl29018", + .pm = ISL29018_PM_OPS, .owner = THIS_MODULE, .of_match_table = isl29018_of_match, }, |