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Message-Id: <20240208172459.280189-4-alisa.roman@analog.com>
Date: Thu, 8 Feb 2024 19:24:57 +0200
From: Alisa-Dariana Roman <alisadariana@...il.com>
To:
Cc: alexandru.tachici@...log.com,
alisa.roman@...log.com,
alisadariana@...il.com,
conor+dt@...nel.org,
devicetree@...r.kernel.org,
dlechner@...libre.com,
jic23@...nel.org,
krzysztof.kozlowski+dt@...aro.org,
krzysztof.kozlowski@...aro.org,
lars@...afoo.de,
linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org,
michael.hennerich@...log.com,
robh+dt@...nel.org
Subject: [PATCH v3 3/5] iio: adc: ad7192: Use standard attribute
Replace custom attribute filter_low_pass_3db_frequency_available with
standard attribute.
Store the available values in ad7192_state struct.
The function that used to compute those values replaced by
ad7192_update_filter_freq_avail().
Function ad7192_show_filter_avail() is no longer needed.
Note that the initial available values are hardcoded.
Signed-off-by: Alisa-Dariana Roman <alisa.roman@...log.com>
---
drivers/iio/adc/ad7192.c | 67 ++++++++++++++++++----------------------
1 file changed, 30 insertions(+), 37 deletions(-)
diff --git a/drivers/iio/adc/ad7192.c b/drivers/iio/adc/ad7192.c
index 5e8043865233..d8393ac048e7 100644
--- a/drivers/iio/adc/ad7192.c
+++ b/drivers/iio/adc/ad7192.c
@@ -187,6 +187,7 @@ struct ad7192_state {
u32 mode;
u32 conf;
u32 scale_avail[8][2];
+ u32 filter_freq_avail[4][2];
u32 oversampling_ratio_avail[4];
u8 gpocon;
u8 clock_sel;
@@ -470,6 +471,16 @@ static int ad7192_setup(struct ad7192_state *st)
st->oversampling_ratio_avail[2] = 8;
st->oversampling_ratio_avail[3] = 16;
+ st->filter_freq_avail[0][0] = 600;
+ st->filter_freq_avail[1][0] = 800;
+ st->filter_freq_avail[2][0] = 2300;
+ st->filter_freq_avail[3][0] = 2720;
+
+ st->filter_freq_avail[0][1] = 1000;
+ st->filter_freq_avail[1][1] = 1000;
+ st->filter_freq_avail[2][1] = 1000;
+ st->filter_freq_avail[3][1] = 1000;
+
return 0;
}
@@ -583,48 +594,24 @@ static int ad7192_get_f_adc(struct ad7192_state *st)
f_order * FIELD_GET(AD7192_MODE_RATE_MASK, st->mode));
}
-static void ad7192_get_available_filter_freq(struct ad7192_state *st,
- int *freq)
+static void ad7192_update_filter_freq_avail(struct ad7192_state *st)
{
unsigned int fadc;
/* Formulas for filter at page 25 of the datasheet */
fadc = ad7192_compute_f_adc(st, false, true);
- freq[0] = DIV_ROUND_CLOSEST(fadc * 240, 1024);
+ st->filter_freq_avail[0][0] = DIV_ROUND_CLOSEST(fadc * 240, 1024);
fadc = ad7192_compute_f_adc(st, true, true);
- freq[1] = DIV_ROUND_CLOSEST(fadc * 240, 1024);
+ st->filter_freq_avail[1][0] = DIV_ROUND_CLOSEST(fadc * 240, 1024);
fadc = ad7192_compute_f_adc(st, false, false);
- freq[2] = DIV_ROUND_CLOSEST(fadc * 230, 1024);
+ st->filter_freq_avail[2][0] = DIV_ROUND_CLOSEST(fadc * 230, 1024);
fadc = ad7192_compute_f_adc(st, true, false);
- freq[3] = DIV_ROUND_CLOSEST(fadc * 272, 1024);
+ st->filter_freq_avail[3][0] = DIV_ROUND_CLOSEST(fadc * 272, 1024);
}
-static ssize_t ad7192_show_filter_avail(struct device *dev,
- struct device_attribute *attr,
- char *buf)
-{
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct ad7192_state *st = iio_priv(indio_dev);
- unsigned int freq_avail[4], i;
- size_t len = 0;
-
- ad7192_get_available_filter_freq(st, freq_avail);
-
- for (i = 0; i < ARRAY_SIZE(freq_avail); i++)
- len += sysfs_emit_at(buf, len, "%d.%03d ", freq_avail[i] / 1000,
- freq_avail[i] % 1000);
-
- buf[len - 1] = '\n';
-
- return len;
-}
-
-static IIO_DEVICE_ATTR(filter_low_pass_3db_frequency_available,
- 0444, ad7192_show_filter_avail, NULL, 0);
-
static IIO_DEVICE_ATTR(bridge_switch_en, 0644,
ad7192_show_bridge_switch, ad7192_set,
AD7192_REG_GPOCON);
@@ -634,7 +621,6 @@ static IIO_DEVICE_ATTR(ac_excitation_en, 0644,
AD7192_REG_CONF);
static struct attribute *ad7192_attributes[] = {
- &iio_dev_attr_filter_low_pass_3db_frequency_available.dev_attr.attr,
&iio_dev_attr_bridge_switch_en.dev_attr.attr,
NULL
};
@@ -644,7 +630,6 @@ static const struct attribute_group ad7192_attribute_group = {
};
static struct attribute *ad7195_attributes[] = {
- &iio_dev_attr_filter_low_pass_3db_frequency_available.dev_attr.attr,
&iio_dev_attr_bridge_switch_en.dev_attr.attr,
&iio_dev_attr_ac_excitation_en.dev_attr.attr,
NULL
@@ -662,17 +647,15 @@ static unsigned int ad7192_get_temp_scale(bool unipolar)
static int ad7192_set_3db_filter_freq(struct ad7192_state *st,
int val, int val2)
{
- int freq_avail[4], i, ret, freq;
+ int i, ret, freq;
unsigned int diff_new, diff_old;
int idx = 0;
diff_old = U32_MAX;
freq = val * 1000 + val2;
- ad7192_get_available_filter_freq(st, freq_avail);
-
- for (i = 0; i < ARRAY_SIZE(freq_avail); i++) {
- diff_new = abs(freq - freq_avail[i]);
+ for (i = 0; i < ARRAY_SIZE(st->filter_freq_avail); i++) {
+ diff_new = abs(freq - st->filter_freq_avail[i][0]);
if (diff_new < diff_old) {
diff_old = diff_new;
idx = i;
@@ -823,6 +806,7 @@ static int ad7192_write_raw(struct iio_dev *indio_dev,
st->mode &= ~AD7192_MODE_RATE_MASK;
st->mode |= FIELD_PREP(AD7192_MODE_RATE_MASK, div);
ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
+ ad7192_update_filter_freq_avail(st);
break;
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
ret = ad7192_set_3db_filter_freq(st, val, val2 / 1000);
@@ -843,6 +827,7 @@ static int ad7192_write_raw(struct iio_dev *indio_dev,
break;
}
mutex_unlock(&st->lock);
+ ad7192_update_filter_freq_avail(st);
break;
default:
ret = -EINVAL;
@@ -885,6 +870,12 @@ static int ad7192_read_avail(struct iio_dev *indio_dev,
/* Values are stored in a 2D matrix */
*length = ARRAY_SIZE(st->scale_avail) * 2;
+ return IIO_AVAIL_LIST;
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+ *vals = (int *)st->filter_freq_avail;
+ *type = IIO_VAL_FRACTIONAL;
+ *length = ARRAY_SIZE(st->filter_freq_avail) * 2;
+
return IIO_AVAIL_LIST;
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
*vals = (int *)st->oversampling_ratio_avail;
@@ -953,7 +944,9 @@ static const struct iio_info ad7195_info = {
BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY) | \
(_mask_all), \
.info_mask_shared_by_type_available = (_mask_type_av), \
- .info_mask_shared_by_all_available = (_mask_all_av), \
+ .info_mask_shared_by_all_available = \
+ BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY) | \
+ (_mask_all_av), \
.ext_info = (_ext_info), \
.scan_index = (_si), \
.scan_type = { \
--
2.34.1
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