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Date: Tue, 16 Jul 2019 10:51:41 +0200
From: Fabien Lahoudere <fabien.lahoudere@...labora.com>
To: Jonathan Cameron <jic23@...nel.org>
Cc: gwendal@...omium.org, egranata@...omium.org, kernel@...labora.com,
Nick Vaccaro <nvaccaro@...omium.org>,
Hartmut Knaack <knaack.h@....de>,
Lars-Peter Clausen <lars@...afoo.de>,
Peter Meerwald-Stadler <pmeerw@...erw.net>,
Benson Leung <bleung@...omium.org>,
Enric Balletbo i Serra <enric.balletbo@...labora.com>,
Guenter Roeck <groeck@...omium.org>,
Alexios Zavras <alexios.zavras@...el.com>,
Allison Randal <allison@...utok.net>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Thomas Gleixner <tglx@...utronix.de>,
linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 1/1] iio: common: cros_ec_sensors: Expose
cros_ec_sensors frequency range via iio sysfs
Le dimanche 14 juillet 2019 à 18:31 +0100, Jonathan Cameron a écrit :
> On Tue, 9 Jul 2019 13:53:45 +0200
> Fabien Lahoudere <fabien.lahoudere@...labora.com> wrote:
>
> > Embedded controller return minimum and maximum frequencies,
> > unfortunately
> > we have no way to know the step for all available frequencies.
> > Even if not complete, we can return a list of known values using
> > the
> > standard read_avail callback (IIO_CHAN_INFO_SAMP_FREQ) to provide
> > them to
> > userland.
> >
> > Now cros_ec_* sensors provides frequencies values in sysfs like
> > this:
> > "0 min max". 0 is always true to disable the sensor.
> >
> > Default frequencies are provided for earlier protocol.
> >
> > Signed-off-by: Nick Vaccaro <nvaccaro@...omium.org>
> > Signed-off-by: Fabien Lahoudere <fabien.lahoudere@...labora.com>
> There is some trailing whitespace in here, and with the high level
> of other work going on in this driver a lot of fuzz.
>
Sorry for that, I will fix it quickly.
Thanks for reviewing
> So with the whitespace fixed,
> Acked-by: Jonathan Cameron <Jonathan.Cameron@...wei.com>
> > ---
> > .../common/cros_ec_sensors/cros_ec_sensors.c | 3 +
> > .../cros_ec_sensors/cros_ec_sensors_core.c | 65
> > +++++++++++++++++++
> > drivers/iio/light/cros_ec_light_prox.c | 3 +
> > .../linux/iio/common/cros_ec_sensors_core.h | 21 ++++++
> > 4 files changed, 92 insertions(+)
> >
> > diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> > b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> > index 17af4e0fd5f8..2f1b6d8d617b 100644
> > --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> > +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
> > @@ -175,6 +175,7 @@ static int cros_ec_sensors_write(struct iio_dev
> > *indio_dev,
> > static const struct iio_info ec_sensors_info = {
> > .read_raw = &cros_ec_sensors_read,
> > .write_raw = &cros_ec_sensors_write,
> > + .read_avail = &cros_ec_sensors_core_read_avail,
> > };
> >
> > static int cros_ec_sensors_probe(struct platform_device *pdev)
> > @@ -211,6 +212,8 @@ static int cros_ec_sensors_probe(struct
> > platform_device *pdev)
> > BIT(IIO_CHAN_INFO_SCALE) |
> > BIT(IIO_CHAN_INFO_FREQUENCY) |
> > BIT(IIO_CHAN_INFO_SAMP_FREQ);
> > + channel->info_mask_shared_by_all_available =
> > + BIT(IIO_CHAN_INFO_SAMP_FREQ);
> > channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
> > channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
> > channel->scan_index = i;
> > diff --git
> > a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> > b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> > index 81111af8a167..805652250960 100644
> > --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> > +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
> > @@ -50,6 +50,37 @@ static int
> > cros_ec_get_host_cmd_version_mask(struct cros_ec_device *ec_dev,
> > return ret;
> > }
> >
> > +static void get_default_min_max_freq(enum motionsensor_type type,
> > + u32 *min_freq,
> > + u32 *max_freq)
> > +{
> > + switch (type) {
> > + case MOTIONSENSE_TYPE_ACCEL:
> > + case MOTIONSENSE_TYPE_GYRO:
> > + *min_freq = 12500;
> > + *max_freq = 100000;
> > + break;
> > + case MOTIONSENSE_TYPE_MAG:
> > + *min_freq = 5000;
> > + *max_freq = 25000;
> > + break;
> > + case MOTIONSENSE_TYPE_PROX:
> > + case MOTIONSENSE_TYPE_LIGHT:
> > + *min_freq = 100;
> > + *max_freq = 50000;
> > + break;
> > + case MOTIONSENSE_TYPE_BARO:
> > + *min_freq = 250;
> > + *max_freq = 20000;
> > + break;
> > + case MOTIONSENSE_TYPE_ACTIVITY:
> > + default:
> > + *min_freq = 0;
> > + *max_freq = 0;
> > + break;
> > + }
> > +}
> > +
> > int cros_ec_sensors_core_init(struct platform_device *pdev,
> > struct iio_dev *indio_dev,
> > bool physical_device)
> > @@ -100,6 +131,19 @@ int cros_ec_sensors_core_init(struct
> > platform_device *pdev,
> > }
> > state->type = state->resp->info.type;
> > state->loc = state->resp->info.location;
> > +
> > + /* 0 is a correct value used to stop the device */
> > + state->frequencies[0] = 0;
> > + if (state->msg->version < 3) {
> > + get_default_min_max_freq(state->resp-
> > >info.type,
> > + &state-
> > >frequencies[1],
> > + &state-
> > >frequencies[2]);
> > + } else {
> > + state->frequencies[1] =
> > + state->resp->info_3.min_frequency;
> > + state->frequencies[2] =
> > + state->resp->info_3.max_frequency;
> > + }
> > }
> >
> > return 0;
> > @@ -461,6 +505,27 @@ int cros_ec_sensors_core_read(struct
> > cros_ec_sensors_core_state *st,
> > }
> > EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read);
> >
> > +int cros_ec_sensors_core_read_avail(struct iio_dev *indio_dev,
> > + struct iio_chan_spec const *chan,
> > + const int **vals,
> > + int *type,
> > + int *length,
> > + long mask)
> > +{
> > + struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
> > +
> > + switch (mask) {
> > + case IIO_CHAN_INFO_SAMP_FREQ:
> > + *length = ARRAY_SIZE(state->frequencies);
> > + *vals = (const int *)&state->frequencies;
> > + *type = IIO_VAL_INT;
> > + return IIO_AVAIL_LIST;
> > + }
> > +
> > + return -EINVAL;
> > +}
> > +EXPORT_SYMBOL_GPL(cros_ec_sensors_core_read_avail);
> > +
> > int cros_ec_sensors_core_write(struct cros_ec_sensors_core_state
> > *st,
> > struct iio_chan_spec const *chan,
> > int val, int val2, long mask)
> > diff --git a/drivers/iio/light/cros_ec_light_prox.c
> > b/drivers/iio/light/cros_ec_light_prox.c
> > index 308ee6ff2e22..c62cb022b6bc 100644
> > --- a/drivers/iio/light/cros_ec_light_prox.c
> > +++ b/drivers/iio/light/cros_ec_light_prox.c
> > @@ -164,6 +164,7 @@ static int cros_ec_light_prox_write(struct
> > iio_dev *indio_dev,
> > static const struct iio_info cros_ec_light_prox_info = {
> > .read_raw = &cros_ec_light_prox_read,
> > .write_raw = &cros_ec_light_prox_write,
> > + .read_avail = &cros_ec_sensors_core_read_avail,
> > };
> >
> > static int cros_ec_light_prox_probe(struct platform_device *pdev)
> > @@ -198,6 +199,8 @@ static int cros_ec_light_prox_probe(struct
> > platform_device *pdev)
> > channel->info_mask_shared_by_all =
> > BIT(IIO_CHAN_INFO_SAMP_FREQ) |
> > BIT(IIO_CHAN_INFO_FREQUENCY);
> > + channel->info_mask_shared_by_all_available =
> > + BIT(IIO_CHAN_INFO_SAMP_FREQ);
> > channel->scan_type.realbits = CROS_EC_SENSOR_BITS;
> > channel->scan_type.storagebits = CROS_EC_SENSOR_BITS;
> > channel->scan_type.shift = 0;
> > diff --git a/include/linux/iio/common/cros_ec_sensors_core.h
> > b/include/linux/iio/common/cros_ec_sensors_core.h
> > index 0c636b9fe8d7..a9623111f7c9 100644
> > --- a/include/linux/iio/common/cros_ec_sensors_core.h
> > +++ b/include/linux/iio/common/cros_ec_sensors_core.h
> > @@ -70,6 +70,9 @@ struct cros_ec_sensors_core_state {
> > unsigned long scan_mask, s16
> > *data);
> >
> > int curr_sampl_freq;
> > +
> > + /* Table of known available frequencies : 0, Min and Max in mHz
> > */
> > + int frequencies[3];
> > };
> >
> > /**
> > @@ -150,6 +153,24 @@ int cros_ec_sensors_core_read(struct
> > cros_ec_sensors_core_state *st,
> > struct iio_chan_spec const *chan,
> > int *val, int *val2, long mask);
> >
> > +/**
> > + * cros_ec_sensors_core_read_avail() - get available values
> > + * @indio_dev: pointer to state information for device
> > + * @chan: channel specification structure table
> > + * @vals: list of available values
> > + * @type: type of data returned
> > + * @length: number of data returned in the array
> > + * @mask: specifies which values to be requested
> > + *
> > + * Return: an error code, IIO_AVAIL_RANGE or IIO_AVAIL_LIST
> > + */
> > +int cros_ec_sensors_core_read_avail(struct iio_dev *indio_dev,
> > + struct iio_chan_spec const *chan,
> > + const int **vals,
> > + int *type,
> > + int *length,
> > + long mask);
> > +
> > /**
> > * cros_ec_sensors_core_write() - function to write a value to the
> > sensor
> > * @st: pointer to state information for device
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