Re: [PATCH 1/3] iio: adc: ad7606: Move oversampling options in chip info and rework *_avail attributes

From: Jonathan Cameron
Date: Sun Apr 07 2019 - 06:54:12 EST

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On Tue, 2 Apr 2019 16:18:39 +0300
Beniamin Bia <beniamin.bia@xxxxxxxxxx> wrote:

> From: Stefan Popa <stefan.popa@xxxxxxxxxx>
>
> Available oversampling ratios and scales can be shown by calling a
> common ad7606_show_avail function which takes as parameters the array
> which stores the values, together with the size of the array.
>
> Oversampling options are now defined in chip info
> structure and they are loaded at probe.
>
> Has_Oversampling attribute was removed because oversampling_num was added
> and it is not needed anymore.
>
> The purpose of this patch is to deal with the scale_avail and
> oversampling_avail arrays in a generic way. This makes it easier to add
> support for new devices which will work with different scales and
> oversampling ratios. It is also an intermediate step for adding support
> for ad7616 which has different oversampling sampling ratios available.
>
> Signed-off-by: Stefan Popa <stefan.popa@xxxxxxxxxx>
> Signed-off-by: Beniamin Bia <beniamin.bia@xxxxxxxxxx>
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

Thanks,

Jonathan

> ---
> drivers/iio/adc/ad7606.c | 74 ++++++++++++++++++++++++++++------------
> drivers/iio/adc/ad7606.h | 16 +++++++--
> 2 files changed, 67 insertions(+), 23 deletions(-)
>
> diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c
> index ebb8de03bbce..6b87ed410c93 100644
> --- a/drivers/iio/adc/ad7606.c
> +++ b/drivers/iio/adc/ad7606.c
> @@ -31,7 +31,7 @@
> * Scales are computed as 5000/32768 and 10000/32768 respectively,
> * so that when applied to the raw values they provide mV values
> */
> -static const unsigned int scale_avail[2] = {
> +static const unsigned int ad7606_scale_avail[2] = {
> 152588, 305176
> };
>
> @@ -154,7 +154,7 @@ static int ad7606_read_raw(struct iio_dev *indio_dev,
> return IIO_VAL_INT;
> case IIO_CHAN_INFO_SCALE:
> *val = 0;
> - *val2 = scale_avail[st->range];
> + *val2 = st->scale_avail[st->range];
> return IIO_VAL_INT_PLUS_MICRO;
> case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
> *val = st->oversampling;
> @@ -163,21 +163,31 @@ static int ad7606_read_raw(struct iio_dev *indio_dev,
> return -EINVAL;
> }
>
> -static ssize_t in_voltage_scale_available_show(struct device *dev,
> - struct device_attribute *attr,
> - char *buf)
> +static ssize_t ad7606_show_avail(char *buf, const unsigned int *vals,
> + unsigned int n, bool micros)
> {
> - int i, len = 0;
> -
> - for (i = 0; i < ARRAY_SIZE(scale_avail); i++)
> - len += scnprintf(buf + len, PAGE_SIZE - len, "0.%06u ",
> - scale_avail[i]);
> + size_t len = 0;
> + int i;
>
> + for (i = 0; i < n; i++) {
> + len += scnprintf(buf + len, PAGE_SIZE - len,
> + micros ? "0.%06u " : "%u ", vals[i]);
> + }
> buf[len - 1] = '\n';
>
> return len;
> }
>
> +static ssize_t in_voltage_scale_available_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> + struct ad7606_state *st = iio_priv(indio_dev);
> +
> + return ad7606_show_avail(buf, st->scale_avail, st->num_scales, true);
> +}
> +
> static IIO_DEVICE_ATTR_RO(in_voltage_scale_available, 0);
>
> static int ad7606_write_raw(struct iio_dev *indio_dev,
> @@ -193,7 +203,7 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
> switch (mask) {
> case IIO_CHAN_INFO_SCALE:
> mutex_lock(&st->lock);
> - i = find_closest(val2, scale_avail, ARRAY_SIZE(scale_avail));
> + i = find_closest(val2, st->scale_avail, st->num_scales);
> gpiod_set_value(st->gpio_range, i);
> st->range = i;
> mutex_unlock(&st->lock);
> @@ -202,15 +212,15 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
> case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
> if (val2)
> return -EINVAL;
> - i = find_closest(val, ad7606_oversampling_avail,
> - ARRAY_SIZE(ad7606_oversampling_avail));
> + i = find_closest(val, st->oversampling_avail,
> + st->num_os_ratios);
>
> values[0] = i;
>
> mutex_lock(&st->lock);
> gpiod_set_array_value(ARRAY_SIZE(values), st->gpio_os->desc,
> st->gpio_os->info, values);
> - st->oversampling = ad7606_oversampling_avail[i];
> + st->oversampling = st->oversampling_avail[i];
> mutex_unlock(&st->lock);
>
> return 0;
> @@ -219,11 +229,23 @@ static int ad7606_write_raw(struct iio_dev *indio_dev,
> }
> }
>
> -static IIO_CONST_ATTR(oversampling_ratio_available, "1 2 4 8 16 32 64");
> +static ssize_t ad7606_oversampling_ratio_avail(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct iio_dev *indio_dev = dev_to_iio_dev(dev);
> + struct ad7606_state *st = iio_priv(indio_dev);
> +
> + return ad7606_show_avail(buf, st->oversampling_avail,
> + st->num_os_ratios, false);
> +}
> +
> +static IIO_DEVICE_ATTR(oversampling_ratio_available, 0444,
> + ad7606_oversampling_ratio_avail, NULL, 0);
>
> static struct attribute *ad7606_attributes_os_and_range[] = {
> &iio_dev_attr_in_voltage_scale_available.dev_attr.attr,
> - &iio_const_attr_oversampling_ratio_available.dev_attr.attr,
> + &iio_dev_attr_oversampling_ratio_available.dev_attr.attr,
> NULL,
> };
>
> @@ -232,7 +254,7 @@ static const struct attribute_group ad7606_attribute_group_os_and_range = {
> };
>
> static struct attribute *ad7606_attributes_os[] = {
> - &iio_const_attr_oversampling_ratio_available.dev_attr.attr,
> + &iio_dev_attr_oversampling_ratio_available.dev_attr.attr,
> NULL,
> };
>
> @@ -301,17 +323,20 @@ static const struct ad7606_chip_info ad7606_chip_info_tbl[] = {
> [ID_AD7606_8] = {
> .channels = ad7606_channels,
> .num_channels = 9,
> - .has_oversampling = true,
> + .oversampling_avail = ad7606_oversampling_avail,
> + .oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
> },
> [ID_AD7606_6] = {
> .channels = ad7606_channels,
> .num_channels = 7,
> - .has_oversampling = true,
> + .oversampling_avail = ad7606_oversampling_avail,
> + .oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
> },
> [ID_AD7606_4] = {
> .channels = ad7606_channels,
> .num_channels = 5,
> - .has_oversampling = true,
> + .oversampling_avail = ad7606_oversampling_avail,
> + .oversampling_num = ARRAY_SIZE(ad7606_oversampling_avail),
> },
> };
>
> @@ -343,7 +368,7 @@ static int ad7606_request_gpios(struct ad7606_state *st)
> if (IS_ERR(st->gpio_frstdata))
> return PTR_ERR(st->gpio_frstdata);
>
> - if (!st->chip_info->has_oversampling)
> + if (!st->chip_info->oversampling_num)
> return 0;
>
> st->gpio_os = devm_gpiod_get_array_optional(dev,
> @@ -467,6 +492,8 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
> /* tied to logic low, analog input range is +/- 5V */
> st->range = 0;
> st->oversampling = 1;
> + st->scale_avail = ad7606_scale_avail;
> + st->num_scales = ARRAY_SIZE(ad7606_scale_avail);
>
> st->reg = devm_regulator_get(dev, "avcc");
> if (IS_ERR(st->reg))
> @@ -484,6 +511,11 @@ int ad7606_probe(struct device *dev, int irq, void __iomem *base_address,
>
> st->chip_info = &ad7606_chip_info_tbl[id];
>
> + if (st->chip_info->oversampling_num) {
> + st->oversampling_avail = st->chip_info->oversampling_avail;
> + st->num_os_ratios = st->chip_info->oversampling_num;
> + }
> +
> ret = ad7606_request_gpios(st);
> if (ret)
> return ret;
> diff --git a/drivers/iio/adc/ad7606.h b/drivers/iio/adc/ad7606.h
> index 5d12410f68e1..8c91bd427c4e 100644
> --- a/drivers/iio/adc/ad7606.h
> +++ b/drivers/iio/adc/ad7606.h
> @@ -12,12 +12,15 @@
> * struct ad7606_chip_info - chip specific information
> * @channels: channel specification
> * @num_channels: number of channels
> - * @has_oversampling: whether the device has oversampling support
> + * @oversampling_avail pointer to the array which stores the available
> + * oversampling ratios.
> + * @oversampling_num number of elements stored in oversampling_avail array
> */
> struct ad7606_chip_info {
> const struct iio_chan_spec *channels;
> unsigned int num_channels;
> - bool has_oversampling;
> + const unsigned int *oversampling_avail;
> + unsigned int oversampling_num;
> };
>
> /**
> @@ -29,6 +32,11 @@ struct ad7606_chip_info {
> * @range voltage range selection, selects which scale to apply
> * @oversampling oversampling selection
> * @base_address address from where to read data in parallel operation
> + * @scale_avail pointer to the array which stores the available scales
> + * @num_scales number of elements stored in the scale_avail array
> + * @oversampling_avail pointer to the array which stores the available
> + * oversampling ratios.
> + * @num_os_ratios number of elements stored in oversampling_avail array
> * @lock protect sensor state from concurrent accesses to GPIOs
> * @gpio_convst GPIO descriptor for conversion start signal (CONVST)
> * @gpio_reset GPIO descriptor for device hard-reset
> @@ -50,6 +58,10 @@ struct ad7606_state {
> unsigned int range;
> unsigned int oversampling;
> void __iomem *base_address;
> + const unsigned int *scale_avail;
> + unsigned int num_scales;
> + const unsigned int *oversampling_avail;
> + unsigned int num_os_ratios;
>
> struct mutex lock; /* protect sensor state */
> struct gpio_desc *gpio_convst;

Next message: Jonathan Cameron: "Re: [PATCH 2/3] iio: adc: ad7616: Add support for AD7616 ADC"
Previous message: Masahiro Yamada: "[PATCH] kbuild: check arch/$(SRCARCH)/include/generated before out-of-tree build"
In reply to: Jonathan Cameron: "Re: [PATCH 3/3] dt-bindings: iio: adc: Add AD7616 ADC documentation"
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