From: Jonathan Cameron <jic23@kernel.org>
To: Andrea Merello <andrea.merello@gmail.com>
Cc: Hartmut Knaack <knaack.h@gmx.de>,
Lars-Peter Clausen <lars@metafoo.de>,
Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
Colin Ian King <colin.king@canonical.com>,
Patrick Havelange <patrick.havelange@essensium.com>,
Matt Weber <matthew.weber@rockwellcollins.com>,
Matt Ranostay <matt.ranostay@konsulko.com>,
Chuhong Yuan <hslester96@gmail.com>,
Daniel Gomez <dagmcr@gmail.com>,
linux-iio@vger.kernel.org
Subject: Re: [v3 3/9] iio: max31856: add support for configuring the HW averaging
Date: Sat, 23 Nov 2019 12:32:04 +0000 [thread overview]
Message-ID: <20191123123204.49fe367b@archlinux> (raw)
In-Reply-To: <20191120144756.28424-4-andrea.merello@gmail.com>
On Wed, 20 Nov 2019 15:47:50 +0100
Andrea Merello <andrea.merello@gmail.com> wrote:
> This sensor can perform samples averaging in hardware, but currently the
> driver leaves this setting alone (default is no averaging).
>
> This patch binds this HW setting to the "oversampling_ratio" IIO attribute
> and allows the user to set the averaging as desired (the HW supports
> averaging of 2, 5, 8 or 16 samples; in-between values are rounded up).
>
> Cc: Hartmut Knaack <knaack.h@gmx.de>
> Cc: Lars-Peter Clausen <lars@metafoo.de>
> Cc: Peter Meerwald-Stadler <pmeerw@pmeerw.net>
> Cc: Colin Ian King <colin.king@canonical.com>
> Cc: Patrick Havelange <patrick.havelange@essensium.com>
> Cc: Matt Weber <matthew.weber@rockwellcollins.com>
> Cc: Matt Ranostay <matt.ranostay@konsulko.com>
> Cc: Chuhong Yuan <hslester96@gmail.com>
> Cc: Daniel Gomez <dagmcr@gmail.com>
> Cc: linux-iio@vger.kernel.org
> Signed-off-by: Andrea Merello <andrea.merello@gmail.com>
Applied. Thanks,
Jonathan
> ---
> drivers/iio/temperature/max31856.c | 43 ++++++++++++++++++++++++++++++
> 1 file changed, 43 insertions(+)
>
> diff --git a/drivers/iio/temperature/max31856.c b/drivers/iio/temperature/max31856.c
> index d97ba9ee1598..8457ca9ae326 100644
> --- a/drivers/iio/temperature/max31856.c
> +++ b/drivers/iio/temperature/max31856.c
> @@ -12,6 +12,7 @@
> #include <linux/spi/spi.h>
> #include <linux/iio/iio.h>
> #include <linux/iio/sysfs.h>
> +#include <linux/util_macros.h>
> #include <dt-bindings/iio/temperature/thermocouple.h>
> /*
> * The MSB of the register value determines whether the following byte will
> @@ -24,6 +25,8 @@
> #define MAX31856_CR0_OCFAULT BIT(4)
> #define MAX31856_CR0_OCFAULT_MASK GENMASK(5, 4)
> #define MAX31856_CR0_FILTER_50HZ BIT(0)
> +#define MAX31856_AVERAGING_MASK GENMASK(6, 4)
> +#define MAX31856_AVERAGING_SHIFT 4
> #define MAX31856_TC_TYPE_MASK GENMASK(3, 0)
> #define MAX31856_FAULT_OVUV BIT(1)
> #define MAX31856_FAULT_OPEN BIT(0)
> @@ -51,6 +54,8 @@ static const struct iio_chan_spec max31856_channels[] = {
> .type = IIO_TEMP,
> .info_mask_separate =
> BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
> + .info_mask_shared_by_type =
> + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO)
> },
> { /* Cold Junction Temperature */
> .type = IIO_TEMP,
> @@ -58,6 +63,8 @@ static const struct iio_chan_spec max31856_channels[] = {
> .modified = 1,
> .info_mask_separate =
> BIT(IIO_CHAN_INFO_RAW) | BIT(IIO_CHAN_INFO_SCALE),
> + .info_mask_shared_by_type =
> + BIT(IIO_CHAN_INFO_OVERSAMPLING_RATIO)
> },
> };
>
> @@ -65,6 +72,7 @@ struct max31856_data {
> struct spi_device *spi;
> u32 thermocouple_type;
> bool filter_50hz;
> + int averaging;
> };
>
> static int max31856_read(struct max31856_data *data, u8 reg,
> @@ -109,6 +117,10 @@ static int max31856_init(struct max31856_data *data)
>
> reg_cr1_val &= ~MAX31856_TC_TYPE_MASK;
> reg_cr1_val |= data->thermocouple_type;
> +
> + reg_cr1_val &= ~MAX31856_AVERAGING_MASK;
> + reg_cr1_val |= data->averaging << MAX31856_AVERAGING_SHIFT;
> +
> ret = max31856_write(data, MAX31856_CR1_REG, reg_cr1_val);
> if (ret)
> return ret;
> @@ -217,6 +229,9 @@ static int max31856_read_raw(struct iio_dev *indio_dev,
> return IIO_VAL_INT_PLUS_MICRO;
> }
> break;
> + case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
> + *val = 1 << data->averaging;
> + return IIO_VAL_INT;
> default:
> ret = -EINVAL;
> break;
> @@ -225,6 +240,33 @@ static int max31856_read_raw(struct iio_dev *indio_dev,
> return ret;
> }
>
> +static int max31856_write_raw(struct iio_dev *indio_dev,
> + struct iio_chan_spec const *chan,
> + int val, int val2, long mask)
> +{
> + struct max31856_data *data = iio_priv(indio_dev);
> + int msb;
> +
> + switch (mask) {
> + case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
> + if (val > 16 || val < 1)
> + return -EINVAL;
> + msb = fls(val) - 1;
> + /* Round up to next 2pow if needed */
> + if (BIT(msb) < val)
> + msb++;
> +
> + data->averaging = msb;
> + max31856_init(data);
> + break;
> +
> + default:
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> static ssize_t show_fault(struct device *dev, u8 faultbit, char *buf)
> {
> struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> @@ -313,6 +355,7 @@ static const struct attribute_group max31856_group = {
>
> static const struct iio_info max31856_info = {
> .read_raw = max31856_read_raw,
> + .write_raw = max31856_write_raw,
> .attrs = &max31856_group,
> };
>
next prev parent reply other threads:[~2019-11-23 12:32 UTC|newest]
Thread overview: 60+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-23 12:17 [PATCH 0/3] iio: max31856: provide more configuration options Andrea Merello
2019-09-23 12:17 ` [PATCH 1/3] iio: max31856: add option for setting mains filter rejection frequency Andrea Merello
2019-10-06 7:54 ` Jonathan Cameron
2019-10-16 13:14 ` Andrea Merello
2019-10-17 12:32 ` Jonathan Cameron
2019-10-18 13:46 ` Andrea Merello
2019-10-22 9:34 ` Jonathan Cameron
2019-10-23 8:29 ` Andrea Merello
2019-10-27 9:22 ` Jonathan Cameron
2019-10-28 7:32 ` Andrea Merello
2019-11-02 14:17 ` Jonathan Cameron
2019-11-04 13:51 ` Andrea Merello
2019-09-23 12:17 ` [PATCH 2/3] iio: max31856: add support for configuring the HW averaging Andrea Merello
2019-10-06 7:55 ` Jonathan Cameron
2019-10-16 13:33 ` Andrea Merello
2019-10-17 12:34 ` Jonathan Cameron
2019-10-18 13:47 ` Andrea Merello
2019-09-23 12:17 ` [PATCH 3/3] iio: max31856: add support for runtime-configuring the thermocouple type Andrea Merello
2019-10-06 7:58 ` Jonathan Cameron
2019-10-16 13:43 ` Andrea Merello
2019-10-17 12:35 ` Jonathan Cameron
2019-10-18 13:48 ` Andrea Merello
2019-11-11 15:35 ` [v2 0/9] iio: max31856: provide more configuration options Andrea Merello
2019-11-11 15:35 ` [v2 1/9] iio: max31856: add option for setting mains filter rejection frequency Andrea Merello
2019-11-11 22:59 ` Matt Ranostay
2019-11-16 14:29 ` Jonathan Cameron
2019-11-11 15:35 ` [v2 2/9] Documentation: ABI: document IIO in_temp_filter_notch_center_frequency file Andrea Merello
2019-11-11 15:35 ` [v2 3/9] iio: max31856: add support for configuring the HW averaging Andrea Merello
2019-11-11 23:01 ` Matt Ranostay
2019-11-11 15:35 ` [v2 4/9] RFC: iio: core: add char type for sysfs attributes Andrea Merello
2019-11-16 14:45 ` Jonathan Cameron
2019-11-11 15:35 ` [v2 5/9] iio: core: add thermocouple_type standard attribute Andrea Merello
2019-11-11 15:35 ` [v2 6/9] Documentation: ABI: document IIO thermocouple_type file Andrea Merello
2019-11-16 14:47 ` Jonathan Cameron
2019-11-11 15:35 ` [v2 7/9] iio: max31856: add support for runtime-configuring the thermocouple type Andrea Merello
2019-11-16 14:49 ` Jonathan Cameron
2019-11-11 15:35 ` [v2 8/9] RFC/RFT: iio: maxim_thermocouple: add thermocouple_type sysfs attribute Andrea Merello
2019-11-16 14:51 ` Jonathan Cameron
2019-11-11 15:35 ` [v2 9/9] dt-bindings: iio: maxim_thermocouple: document new 'compatible' strings Andrea Merello
2019-11-14 22:12 ` Rob Herring
2019-11-20 14:47 ` [v3 0/9] iio: max31856: provide more configuration options Andrea Merello
2019-11-20 14:47 ` [v3 1/9] iio: max31856: add option for setting mains filter rejection frequency Andrea Merello
2019-11-23 12:30 ` Jonathan Cameron
2019-11-20 14:47 ` [v3 2/9] Documentation: ABI: document IIO in_temp_filter_notch_center_frequency file Andrea Merello
2019-11-23 12:31 ` Jonathan Cameron
2019-11-20 14:47 ` [v3 3/9] iio: max31856: add support for configuring the HW averaging Andrea Merello
2019-11-23 12:32 ` Jonathan Cameron [this message]
2019-11-20 14:47 ` [v3 4/9] RFC: iio: core: add char type for sysfs attributes Andrea Merello
2019-11-23 12:33 ` Jonathan Cameron
2019-11-20 14:47 ` [v3 5/9] iio: core: add thermocouple_type standard attribute Andrea Merello
2019-11-23 12:36 ` Jonathan Cameron
2019-11-20 14:47 ` [v3 6/9] Documentation: ABI: document IIO thermocouple_type file Andrea Merello
2019-11-23 12:37 ` Jonathan Cameron
2019-11-20 14:47 ` [v3 7/9] iio: max31856: add support for runtime-configuring the thermocouple type Andrea Merello
2019-11-23 12:40 ` Jonathan Cameron
2019-11-23 12:41 ` Jonathan Cameron
2019-11-20 14:47 ` [v3 8/9] RFC/RFT: iio: maxim_thermocouple: add thermocouple_type sysfs attribute Andrea Merello
2019-11-23 12:46 ` Jonathan Cameron
2019-11-20 14:47 ` [v3 9/9] dt-bindings: iio: maxim_thermocouple: document new 'compatible' strings Andrea Merello
2019-11-23 12:46 ` Jonathan Cameron
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