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authorBryan Freed <bfreed@chromium.org>2012-10-25 00:39:00 +0100
committerJonathan Cameron <jic23@kernel.org>2012-11-02 09:50:59 +0000
commit1e45cf3c493cb76618558201a8ef6f3a065f9073 (patch)
tree06c321b1730f10a46a6bc0027104e36d8d50358d
parentef4f92c064697a66a2a61977dd690af40dc01ff0 (diff)
iio: isl29018: Support suspend and resume.iio-for-3.8b
The driver leaves the device in power-down state anyway, so there is nothing to do on suspend. On resume, we just have to make sure the range and ADC values are updated in the device since it may have been powered down in suspend. Signed-off-by: Bryan Freed <bfreed@chromium.org> Signed-off-by: Jonathan Cameron <jic23@kernel.org>
-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,
},