[PATCH v2 2/2] iio: vncl4000: Enable runtime pm for vcnl4200/4040

Guido Günther
2020-01-30T13:42:48Z

This is modelled after the vcnl4035 driver. For the vcnl40{0,1,2}0
we don't do anything since they use on demand measurement.

Signed-off-by: Guido Günther <agx@sigxcpu.org>
---
drivers/iio/light/vcnl4000.c | 135 ++++++++++++++++++++++++++++++++---
1 file changed, 124 insertions(+), 11 deletions(-)

diff --git a/drivers/iio/light/vcnl4000.c b/drivers/iio/light/vcnl4000.c
index 8f198383626b..1395875d9553 100644
--- a/drivers/iio/light/vcnl4000.c
+++ b/drivers/iio/light/vcnl4000.c
@@ -22,6 +22,7 @@
#include <linux/i2c.h>
#include <linux/err.h>
#include <linux/delay.h>
+#include <linux/pm_runtime.h>

#include <linux/iio/iio.h>
#include <linux/iio/sysfs.h>
@@ -57,6 +58,8 @@
#define VCNL4000_AL_OD BIT(4) /* start on-demand ALS measurement */
#define VCNL4000_PS_OD BIT(3) /* start on-demand proximity measurement */

+#define VCNL4000_SLEEP_DELAY_MS 2000 /* before we enter pm_runtime_suspend */
+
enum vcnl4000_device_ids {
VCNL4000,
VCNL4010,
@@ -87,6 +90,7 @@ struct vcnl4000_chip_spec {
int (*init)(struct vcnl4000_data *data);
int (*measure_light)(struct vcnl4000_data *data, int *val);
int (*measure_proximity)(struct vcnl4000_data *data, int *val);
+ int (*set_power_state)(struct vcnl4000_data *data, bool on);
};

static const struct i2c_device_id vcnl4000_id[] = {
@@ -99,6 +103,12 @@ static const struct i2c_device_id vcnl4000_id[] = {
};
MODULE_DEVICE_TABLE(i2c, vcnl4000_id);

+static int vcnl4000_set_power_state(struct vcnl4000_data *data, bool on)
+{
+ /* no suspend op */
+ return 0;
+}
+
static int vcnl4000_init(struct vcnl4000_data *data)
{
int ret, prod_id;
@@ -127,9 +137,31 @@ static int vcnl4000_init(struct vcnl4000_data *data)
data->al_scale = 250000;
mutex_init(&data->vcnl4000_lock);

+ ret = data->chip_spec->set_power_state(data, true);
+ if (ret < 0)
+ return ret;
+
return 0;
};

+static int vcnl4200_set_power_state(struct vcnl4000_data *data, bool on)
+{
+ u16 val = on ? 0 /* power on */ : 1 /* shut down */;
+ int ret;
+
+ ret = i2c_smbus_write_word_data(data->client, VCNL4200_AL_CONF, val);
+ if (ret < 0)
+ return ret;
+
+ return i2c_smbus_write_word_data(data->client, VCNL4200_PS_CONF1, val);
+ if (ret < 0)
+ return ret;
+
+ /* Wait at least one integration cycle before fetching data */
+ data->vcnl4200_al.last_measurement = ktime_get();
+ data->vcnl4200_ps.last_measurement = ktime_get();
+}
+
static int vcnl4200_init(struct vcnl4000_data *data)
{
int ret, id;
@@ -155,14 +187,6 @@ static int vcnl4200_init(struct vcnl4000_data *data)

data->rev = (ret >> 8) & 0xf;

- /* Set defaults and enable both channels */
- ret = i2c_smbus_write_word_data(data->client, VCNL4200_AL_CONF, 0);
- if (ret < 0)
- return ret;
- ret = i2c_smbus_write_word_data(data->client, VCNL4200_PS_CONF1, 0);
- if (ret < 0)
- return ret;
-
data->vcnl4200_al.reg = VCNL4200_AL_DATA;
data->vcnl4200_ps.reg = VCNL4200_PS_DATA;
switch (id) {
@@ -180,11 +204,13 @@ static int vcnl4200_init(struct vcnl4000_data *data)
data->al_scale = 120000;
break;
}
- data->vcnl4200_al.last_measurement = ktime_set(0, 0);
- data->vcnl4200_ps.last_measurement = ktime_set(0, 0);
mutex_init(&data->vcnl4200_al.lock);
mutex_init(&data->vcnl4200_ps.lock);

+ ret = data->chip_spec->set_power_state(data, true);
+ if (ret < 0)
+ return ret;
+
return 0;
};

@@ -291,24 +317,28 @@ static const struct vcnl4000_chip_spec vcnl4000_chip_spec_cfg[] = {
.init = vcnl4000_init,
.measure_light = vcnl4000_measure_light,
.measure_proximity = vcnl4000_measure_proximity,
+ .set_power_state = vcnl4000_set_power_state,
},
[VCNL4010] = {
.prod = "VCNL4010/4020",
.init = vcnl4000_init,
.measure_light = vcnl4000_measure_light,
.measure_proximity = vcnl4000_measure_proximity,
+ .set_power_state = vcnl4000_set_power_state,
},
[VCNL4040] = {
.prod = "VCNL4040",
.init = vcnl4200_init,
.measure_light = vcnl4200_measure_light,
.measure_proximity = vcnl4200_measure_proximity,
+ .set_power_state = vcnl4200_set_power_state,
},
[VCNL4200] = {
.prod = "VCNL4200",
.init = vcnl4200_init,
.measure_light = vcnl4200_measure_light,
.measure_proximity = vcnl4200_measure_proximity,
+ .set_power_state = vcnl4200_set_power_state,
},
};

@@ -323,6 +353,23 @@ static const struct iio_chan_spec vcnl4000_channels[] = {
}
};

+static int vcnl4000_set_pm_runtime_state(struct vcnl4000_data *data, bool on)
+{
+ struct device *dev = &data->client->dev;
+ int ret;
+
+ if (on) {
+ ret = pm_runtime_get_sync(dev);
+ if (ret < 0)
+ pm_runtime_put_noidle(dev);
+ } else {
+ pm_runtime_mark_last_busy(dev);
+ ret = pm_runtime_put_autosuspend(dev);
+ }
+
+ return ret;
+}
+
static int vcnl4000_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
@@ -332,6 +379,10 @@ static int vcnl4000_read_raw(struct iio_dev *indio_dev,

switch (mask) {
case IIO_CHAN_INFO_RAW:
+ ret = vcnl4000_set_pm_runtime_state(data, true);
+ if (ret < 0)
+ return ret;
+
switch (chan->type) {
case IIO_LIGHT:
ret = data->chip_spec->measure_light(data, val);
@@ -346,6 +397,7 @@ static int vcnl4000_read_raw(struct iio_dev *indio_dev,
default:
ret = -EINVAL;
}
+ vcnl4000_set_pm_runtime_state(data, false);
return ret;
case IIO_CHAN_INFO_SCALE:
if (chan->type != IIO_LIGHT)
@@ -394,7 +446,22 @@ static int vcnl4000_probe(struct i2c_client *client,
indio_dev->name = VCNL4000_DRV_NAME;
indio_dev->modes = INDIO_DIRECT_MODE;

- return devm_iio_device_register(&client->dev, indio_dev);
+ ret = pm_runtime_set_active(&client->dev);
+ if (ret < 0)
+ goto fail_poweroff;
+
+ ret = iio_device_register(indio_dev);
+ if (ret < 0)
+ goto fail_poweroff;
+
+ pm_runtime_enable(&client->dev);
+ pm_runtime_set_autosuspend_delay(&client->dev, VCNL4000_SLEEP_DELAY_MS);
+ pm_runtime_use_autosuspend(&client->dev);
+
+ return 0;
+fail_poweroff:
+ data->chip_spec->set_power_state(data, false);
+ return ret;
}

static const struct of_device_id vcnl_4000_of_match[] = {
@@ -422,13 +489,59 @@ static const struct of_device_id vcnl_4000_of_match[] = {
};
MODULE_DEVICE_TABLE(of, vcnl_4000_of_match);

+static int vcnl4000_remove(struct i2c_client *client)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(client);
+ struct vcnl4000_data *data = iio_priv(indio_dev);
+
+ pm_runtime_dont_use_autosuspend(&client->dev);
+ pm_runtime_disable(&client->dev);
+ iio_device_unregister(indio_dev);
+ pm_runtime_set_suspended(&client->dev);
+
+ return data->chip_spec->set_power_state(data, false);
+}
+
+static int __maybe_unused vcnl4000_runtime_suspend(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct vcnl4000_data *data = iio_priv(indio_dev);
+ int ret;
+
+ ret = data->chip_spec->set_power_state(data, false);
+
+ return ret;
+}
+
+static int __maybe_unused vcnl4000_runtime_resume(struct device *dev)
+{
+ struct iio_dev *indio_dev = i2c_get_clientdata(to_i2c_client(dev));
+ struct vcnl4000_data *data = iio_priv(indio_dev);
+ int ret;
+
+ ret = data->chip_spec->set_power_state(data, true);
+ if (ret < 0)
+ return ret;
+
+ return 0;
+}
+
+static const struct dev_pm_ops vcnl4000_pm_ops = {
+ SET_SYSTEM_SLEEP_PM_OPS(pm_runtime_force_suspend,
+ pm_runtime_force_resume)
+ SET_RUNTIME_PM_OPS(vcnl4000_runtime_suspend,
+ vcnl4000_runtime_resume, NULL)
+};
+
static struct i2c_driver vcnl4000_driver = {
.driver = {
.name = VCNL4000_DRV_NAME,
+ .pm = &vcnl4000_pm_ops,
.of_match_table = vcnl_4000_of_match,
},
.probe = vcnl4000_probe,
.id_table = vcnl4000_id,
+ .remove = vcnl4000_remove,
};

module_i2c_driver(vcnl4000_driver);
--
2.23.0