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-rw-r--r--drivers/staging/iio/light/isl29018.c45
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,
},