On Sun, 2015-02-01 at 10:25 +0000, Jonathan Cameron wrote:
> On 12/01/15 01:57, Srinivas Pandruvada wrote:
> > Add additional flag to read in async mode. In this mode the caller will get
> > reply via registered callback for capture_sample. Callbacks can be
> > registered
> > using sensor_hub_register_callback function. The usage id parameter of the
> > capture_sample can be matched with the usage id of the requested attribute.
> >
> > Signed-off-by: Srinivas Pandruvada <[email protected]>
> Looks like a straightforward 'pattern' to me. Only real question is whether
> reversing the logic in the read function to make the synchronous case the
> one that has the if statement would lead to a cleaner result?
Submitted new version with the suggested change, by reversing the logic.
Thanks,
Srinivas
> > ---
> > drivers/hid/hid-sensor-hub.c | 15 ++++++++++++++-
> > drivers/iio/accel/hid-sensor-accel-3d.c | 3 ++-
> > drivers/iio/gyro/hid-sensor-gyro-3d.c | 3 ++-
> > drivers/iio/light/hid-sensor-als.c | 3 ++-
> > drivers/iio/light/hid-sensor-prox.c | 3 ++-
> > drivers/iio/magnetometer/hid-sensor-magn-3d.c | 3 ++-
> > drivers/iio/orientation/hid-sensor-incl-3d.c | 3 ++-
> > drivers/iio/pressure/hid-sensor-press.c | 3 ++-
> > drivers/rtc/rtc-hid-sensor-time.c | 2 +-
> > include/linux/hid-sensor-hub.h | 19 +++++++++++++------
> > 10 files changed, 42 insertions(+), 15 deletions(-)
> >
> > diff --git a/drivers/hid/hid-sensor-hub.c b/drivers/hid/hid-sensor-hub.c
> > index 8bed109..7403b25 100644
> > --- a/drivers/hid/hid-sensor-hub.c
> > +++ b/drivers/hid/hid-sensor-hub.c
> > @@ -275,13 +275,26 @@ EXPORT_SYMBOL_GPL(sensor_hub_get_feature);
> >
> > int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device
> > *hsdev,
> > u32 usage_id,
> > - u32 attr_usage_id, u32 report_id)
> > + u32 attr_usage_id, u32 report_id,
> > + enum sensor_hub_read_flags flag)
> > {
> > struct sensor_hub_data *data = hid_get_drvdata(hsdev->hdev);
> > unsigned long flags;
> > struct hid_report *report;
> > int ret_val = 0;
> >
> This seems a little backwards from the normal case where we have
> additional stuff (e.g. under an if) for the synchronous case
> than the the asynchronous case. That would require (I think)
> 2 or 3 if blocks, rather than the one. It does look like
> reorgansing the synchronous case to pull the report creation
> earlier would reduce the time the mutex is held and make
> it easier to separate out the synchronous only parts...
>
> What do you think?
>
> This is clearly the least invasive patch necessary, but seems
> like the resulting code is slightly less clean than it would
> otherwise be, with slightly more repitition...
> > + if (flag == SENSOR_HUB_ASYNC) {
> > + report = sensor_hub_report(report_id, hsdev->hdev,
> > + HID_INPUT_REPORT);
> > + if (!report)
> > + return -EINVAL;
> > +
> > + mutex_lock(&data->mutex);
> > + hid_hw_request(hsdev->hdev, report, HID_REQ_GET_REPORT);
> > + mutex_unlock(&data->mutex);
> > + return 0;
> > + }
> > +
> > mutex_lock(&hsdev->mutex);
> > memset(&hsdev->pending, 0, sizeof(hsdev->pending));
> > init_completion(&hsdev->pending.ready);
> > diff --git a/drivers/iio/accel/hid-sensor-accel-3d.c
> > b/drivers/iio/accel/hid-sensor-accel-3d.c
> > index d5d9531..0085c2f 100644
> > --- a/drivers/iio/accel/hid-sensor-accel-3d.c
> > +++ b/drivers/iio/accel/hid-sensor-accel-3d.c
> > @@ -130,7 +130,8 @@ static int accel_3d_read_raw(struct iio_dev *indio_dev,
> > *val = sensor_hub_input_attr_get_raw_value(
> > accel_state->common_attributes.hsdev,
> > HID_USAGE_SENSOR_ACCEL_3D, address,
> > - report_id);
> > + report_id,
> > + SENSOR_HUB_SYNC);
> > else {
> > *val = 0;
> > hid_sensor_power_state(&accel_state->common_attributes,
> > diff --git a/drivers/iio/gyro/hid-sensor-gyro-3d.c
> > b/drivers/iio/gyro/hid-sensor-gyro-3d.c
> > index a3ea1e8..bdcd105 100644
> > --- a/drivers/iio/gyro/hid-sensor-gyro-3d.c
> > +++ b/drivers/iio/gyro/hid-sensor-gyro-3d.c
> > @@ -130,7 +130,8 @@ static int gyro_3d_read_raw(struct iio_dev *indio_dev,
> > *val = sensor_hub_input_attr_get_raw_value(
> > gyro_state->common_attributes.hsdev,
> > HID_USAGE_SENSOR_GYRO_3D, address,
> > - report_id);
> > + report_id,
> > + SENSOR_HUB_SYNC);
> > else {
> > *val = 0;
> > hid_sensor_power_state(&gyro_state->common_attributes,
> > diff --git a/drivers/iio/light/hid-sensor-als.c
> > b/drivers/iio/light/hid-sensor-als.c
> > index a5283d7..321862d 100644
> > --- a/drivers/iio/light/hid-sensor-als.c
> > +++ b/drivers/iio/light/hid-sensor-als.c
> > @@ -109,7 +109,8 @@ static int als_read_raw(struct iio_dev *indio_dev,
> > *val = sensor_hub_input_attr_get_raw_value(
> > als_state->common_attributes.hsdev,
> > HID_USAGE_SENSOR_ALS, address,
> > - report_id);
> > + report_id,
> > + SENSOR_HUB_SYNC);
> > hid_sensor_power_state(&als_state->common_attributes,
> > false);
> > } else {
> > diff --git a/drivers/iio/light/hid-sensor-prox.c
> > b/drivers/iio/light/hid-sensor-prox.c
> > index f5a5146..db9c60e 100644
> > --- a/drivers/iio/light/hid-sensor-prox.c
> > +++ b/drivers/iio/light/hid-sensor-prox.c
> > @@ -105,7 +105,8 @@ static int prox_read_raw(struct iio_dev *indio_dev,
> > *val = sensor_hub_input_attr_get_raw_value(
> > prox_state->common_attributes.hsdev,
> > HID_USAGE_SENSOR_PROX, address,
> > - report_id);
> > + report_id,
> > + SENSOR_HUB_SYNC);
> > hid_sensor_power_state(&prox_state->common_attributes,
> > false);
> > } else {
> > diff --git a/drivers/iio/magnetometer/hid-sensor-magn-3d.c
> > b/drivers/iio/magnetometer/hid-sensor-magn-3d.c
> > index 6294575..4d299f3 100644
> > --- a/drivers/iio/magnetometer/hid-sensor-magn-3d.c
> > +++ b/drivers/iio/magnetometer/hid-sensor-magn-3d.c
> > @@ -178,7 +178,8 @@ static int magn_3d_read_raw(struct iio_dev *indio_dev,
> > *val = sensor_hub_input_attr_get_raw_value(
> > magn_state->common_attributes.hsdev,
> > HID_USAGE_SENSOR_COMPASS_3D, address,
> > - report_id);
> > + report_id,
> > + SENSOR_HUB_SYNC);
> > else {
> > *val = 0;
> > hid_sensor_power_state(&magn_state->common_attributes,
> > diff --git a/drivers/iio/orientation/hid-sensor-incl-3d.c
> > b/drivers/iio/orientation/hid-sensor-incl-3d.c
> > index 1ff181b..45bed08 100644
> > --- a/drivers/iio/orientation/hid-sensor-incl-3d.c
> > +++ b/drivers/iio/orientation/hid-sensor-incl-3d.c
> > @@ -132,7 +132,8 @@ static int incl_3d_read_raw(struct iio_dev *indio_dev,
> > *val = sensor_hub_input_attr_get_raw_value(
> > incl_state->common_attributes.hsdev,
> > HID_USAGE_SENSOR_INCLINOMETER_3D, address,
> > - report_id);
> > + report_id,
> > + SENSOR_HUB_SYNC);
> > else {
> > hid_sensor_power_state(&incl_state->common_attributes,
> > false);
> > diff --git a/drivers/iio/pressure/hid-sensor-press.c
> > b/drivers/iio/pressure/hid-sensor-press.c
> > index 7649286..ac150f0 100644
> > --- a/drivers/iio/pressure/hid-sensor-press.c
> > +++ b/drivers/iio/pressure/hid-sensor-press.c
> > @@ -108,7 +108,8 @@ static int press_read_raw(struct iio_dev *indio_dev,
> > *val = sensor_hub_input_attr_get_raw_value(
> > press_state->common_attributes.hsdev,
> > HID_USAGE_SENSOR_PRESSURE, address,
> > - report_id);
> > + report_id,
> > + SENSOR_HUB_SYNC);
> > hid_sensor_power_state(&press_state->common_attributes,
> > false);
> > } else {
> > diff --git a/drivers/rtc/rtc-hid-sensor-time.c
> > b/drivers/rtc/rtc-hid-sensor-time.c
> > index ae7c2ba..af4f85a 100644
> > --- a/drivers/rtc/rtc-hid-sensor-time.c
> > +++ b/drivers/rtc/rtc-hid-sensor-time.c
> > @@ -213,7 +213,7 @@ static int hid_rtc_read_time(struct device *dev, struct
> > rtc_time *tm)
> > /* get a report with all values through requesting one value */
> > sensor_hub_input_attr_get_raw_value(time_state->common_attributes.hsdev,
> > HID_USAGE_SENSOR_TIME, hid_time_addresses[0],
> > - time_state->info[0].report_id);
> > + time_state->info[0].report_id, SENSOR_HUB_SYNC);
> > /* wait for all values (event) */
> > ret = wait_for_completion_killable_timeout(
> > &time_state->comp_last_time, HZ*6);
> > diff --git a/include/linux/hid-sensor-hub.h b/include/linux/hid-sensor-hub.h
> > index a51c768..d48e91f 100644
> > --- a/include/linux/hid-sensor-hub.h
> > +++ b/include/linux/hid-sensor-hub.h
> > @@ -171,20 +171,27 @@ int sensor_hub_input_get_attribute_info(struct
> > hid_sensor_hub_device *hsdev,
> > struct hid_sensor_hub_attribute_info *info);
> >
> > /**
> > -* sensor_hub_input_attr_get_raw_value() - Synchronous read request
> > +* sensor_hub_input_attr_get_raw_value() - Attribute read request
> > * @hsdev: Hub device instance.
> > * @usage_id: Attribute usage id of parent physical device as per spec
> > * @attr_usage_id: Attribute usage id as per spec
> > * @report_id: Report id to look for
> > +* @flag: Synchronour or asynchronous read
> > *
> > -* Issues a synchronous read request for an input attribute. Returns
> > -* data upto 32 bits. Since client can get events, so this call should
> > -* not be used for data paths, this will impact performance.
> > +* Issues a synchronous or asynchronous read request for an input attribute.
> > +* Returns data upto 32 bits.
> > */
> >
> > +enum sensor_hub_read_flags {
> > + SENSOR_HUB_SYNC,
> > + SENSOR_HUB_ASYNC,
> > +};
> > +
> > int sensor_hub_input_attr_get_raw_value(struct hid_sensor_hub_device
> > *hsdev,
> > - u32 usage_id,
> > - u32 attr_usage_id, u32 report_id);
> > + u32 usage_id,
> > + u32 attr_usage_id, u32 report_id,
> > + enum sensor_hub_read_flags flag
> > +);
> > /**
> > * sensor_hub_set_feature() - Feature set request
> > * @hsdev: Hub device instance.
> >
>
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