Commit 77f6a230 authored by Mircea Caprioru's avatar Mircea Caprioru Committed by Jonathan Cameron

staging: iio: adc: ad7192: Add low_pass_3db_filter_frequency

By adding this option we are able to remove the sync3 field and dt binding.
When setting the required cutoff frequency we also determine the ADC
configuration for chop and sync filter.
Signed-off-by: default avatarMircea Caprioru <mircea.caprioru@analog.com>
Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent 4be27c2a
...@@ -143,6 +143,10 @@ ...@@ -143,6 +143,10 @@
#define AD7192_EXT_FREQ_MHZ_MAX 5120000 #define AD7192_EXT_FREQ_MHZ_MAX 5120000
#define AD7192_INT_FREQ_MHZ 4915200 #define AD7192_INT_FREQ_MHZ 4915200
#define AD7192_NO_SYNC_FILTER 1
#define AD7192_SYNC3_FILTER 3
#define AD7192_SYNC4_FILTER 4
/* NOTE: /* NOTE:
* The AD7190/2/5 features a dual use data out ready DOUT/RDY output. * The AD7190/2/5 features a dual use data out ready DOUT/RDY output.
* In order to avoid contentions on the SPI bus, it's therefore necessary * In order to avoid contentions on the SPI bus, it's therefore necessary
...@@ -250,7 +254,7 @@ static int ad7192_of_clock_select(struct ad7192_state *st) ...@@ -250,7 +254,7 @@ static int ad7192_of_clock_select(struct ad7192_state *st)
static int ad7192_setup(struct ad7192_state *st, struct device_node *np) static int ad7192_setup(struct ad7192_state *st, struct device_node *np)
{ {
struct iio_dev *indio_dev = spi_get_drvdata(st->sd.spi); struct iio_dev *indio_dev = spi_get_drvdata(st->sd.spi);
bool rej60_en, sinc3_en, refin2_en, chop_en; bool rej60_en, refin2_en;
bool buf_en, bipolar, burnout_curr_en; bool buf_en, bipolar, burnout_curr_en;
unsigned long long scale_uv; unsigned long long scale_uv;
int i, ret, id; int i, ret, id;
...@@ -282,24 +286,12 @@ static int ad7192_setup(struct ad7192_state *st, struct device_node *np) ...@@ -282,24 +286,12 @@ static int ad7192_setup(struct ad7192_state *st, struct device_node *np)
if (rej60_en) if (rej60_en)
st->mode |= AD7192_MODE_REJ60; st->mode |= AD7192_MODE_REJ60;
sinc3_en = of_property_read_bool(np, "adi,sinc3-filter-enable");
if (sinc3_en)
st->mode |= AD7192_MODE_SINC3;
refin2_en = of_property_read_bool(np, "adi,refin2-pins-enable"); refin2_en = of_property_read_bool(np, "adi,refin2-pins-enable");
if (refin2_en && st->devid != ID_AD7195) if (refin2_en && st->devid != ID_AD7195)
st->conf |= AD7192_CONF_REFSEL; st->conf |= AD7192_CONF_REFSEL;
chop_en = of_property_read_bool(np, "adi,chop-enable"); st->conf &= ~AD7192_CONF_CHOP;
if (chop_en) { st->f_order = AD7192_NO_SYNC_FILTER;
st->conf |= AD7192_CONF_CHOP;
if (sinc3_en)
st->f_order = 3; /* SINC 3rd order */
else
st->f_order = 4; /* SINC 4th order */
} else {
st->f_order = 1;
}
buf_en = of_property_read_bool(np, "adi,buffer-enable"); buf_en = of_property_read_bool(np, "adi,buffer-enable");
if (buf_en) if (buf_en)
...@@ -311,7 +303,7 @@ static int ad7192_setup(struct ad7192_state *st, struct device_node *np) ...@@ -311,7 +303,7 @@ static int ad7192_setup(struct ad7192_state *st, struct device_node *np)
burnout_curr_en = of_property_read_bool(np, burnout_curr_en = of_property_read_bool(np,
"adi,burnout-currents-enable"); "adi,burnout-currents-enable");
if (burnout_curr_en && buf_en && !chop_en) { if (burnout_curr_en && buf_en) {
st->conf |= AD7192_CONF_BURN; st->conf |= AD7192_CONF_BURN;
} else if (burnout_curr_en) { } else if (burnout_curr_en) {
dev_warn(&st->sd.spi->dev, dev_warn(&st->sd.spi->dev,
...@@ -409,6 +401,49 @@ static ssize_t ad7192_set(struct device *dev, ...@@ -409,6 +401,49 @@ static ssize_t ad7192_set(struct device *dev,
return ret ? ret : len; return ret ? ret : len;
} }
static void ad7192_get_available_filter_freq(struct ad7192_state *st,
int *freq)
{
unsigned int fadc;
/* Formulas for filter at page 25 of the datasheet */
fadc = DIV_ROUND_CLOSEST(st->fclk,
AD7192_SYNC4_FILTER * AD7192_MODE_RATE(st->mode));
freq[0] = DIV_ROUND_CLOSEST(fadc * 240, 1024);
fadc = DIV_ROUND_CLOSEST(st->fclk,
AD7192_SYNC3_FILTER * AD7192_MODE_RATE(st->mode));
freq[1] = DIV_ROUND_CLOSEST(fadc * 240, 1024);
fadc = DIV_ROUND_CLOSEST(st->fclk, AD7192_MODE_RATE(st->mode));
freq[2] = DIV_ROUND_CLOSEST(fadc * 230, 1024);
freq[3] = 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 += scnprintf(buf + len, PAGE_SIZE - len,
"%d.%d ", 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, static IIO_DEVICE_ATTR(bridge_switch_en, 0644,
ad7192_show_bridge_switch, ad7192_set, ad7192_show_bridge_switch, ad7192_set,
AD7192_REG_GPOCON); AD7192_REG_GPOCON);
...@@ -418,6 +453,7 @@ static IIO_DEVICE_ATTR(ac_excitation_en, 0644, ...@@ -418,6 +453,7 @@ static IIO_DEVICE_ATTR(ac_excitation_en, 0644,
AD7192_REG_MODE); AD7192_REG_MODE);
static struct attribute *ad7192_attributes[] = { 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, &iio_dev_attr_bridge_switch_en.dev_attr.attr,
&iio_dev_attr_ac_excitation_en.dev_attr.attr, &iio_dev_attr_ac_excitation_en.dev_attr.attr,
NULL NULL
...@@ -428,6 +464,7 @@ static const struct attribute_group ad7192_attribute_group = { ...@@ -428,6 +464,7 @@ static const struct attribute_group ad7192_attribute_group = {
}; };
static struct attribute *ad7195_attributes[] = { 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_bridge_switch_en.dev_attr.attr,
NULL NULL
}; };
...@@ -441,6 +478,75 @@ static unsigned int ad7192_get_temp_scale(bool unipolar) ...@@ -441,6 +478,75 @@ static unsigned int ad7192_get_temp_scale(bool unipolar)
return unipolar ? 2815 * 2 : 2815; return unipolar ? 2815 * 2 : 2815;
} }
static int ad7192_set_3db_filter_freq(struct ad7192_state *st,
int val, int val2)
{
int freq_avail[4], 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]);
if (diff_new < diff_old) {
diff_old = diff_new;
idx = i;
}
}
switch (idx) {
case 0:
st->f_order = AD7192_SYNC4_FILTER;
st->mode &= ~AD7192_MODE_SINC3;
st->conf |= AD7192_CONF_CHOP;
break;
case 1:
st->f_order = AD7192_SYNC3_FILTER;
st->mode |= AD7192_MODE_SINC3;
st->conf |= AD7192_CONF_CHOP;
break;
case 2:
st->f_order = AD7192_NO_SYNC_FILTER;
st->mode &= ~AD7192_MODE_SINC3;
st->conf &= ~AD7192_CONF_CHOP;
break;
case 3:
st->f_order = AD7192_NO_SYNC_FILTER;
st->mode |= AD7192_MODE_SINC3;
st->conf &= ~AD7192_CONF_CHOP;
break;
}
ret = ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
if (ret < 0)
return ret;
return ad_sd_write_reg(&st->sd, AD7192_REG_CONF, 3, st->conf);
}
static int ad7192_get_3db_filter_freq(struct ad7192_state *st)
{
unsigned int fadc;
fadc = DIV_ROUND_CLOSEST(st->fclk,
st->f_order * AD7192_MODE_RATE(st->mode));
if (st->conf & AD7192_CONF_CHOP)
return DIV_ROUND_CLOSEST(fadc * 240, 1024);
if (st->mode & AD7192_MODE_SINC3)
return DIV_ROUND_CLOSEST(fadc * 272, 1024);
else
return DIV_ROUND_CLOSEST(fadc * 230, 1024);
}
static int ad7192_read_raw(struct iio_dev *indio_dev, static int ad7192_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan, struct iio_chan_spec const *chan,
int *val, int *val,
...@@ -481,6 +587,10 @@ static int ad7192_read_raw(struct iio_dev *indio_dev, ...@@ -481,6 +587,10 @@ static int ad7192_read_raw(struct iio_dev *indio_dev,
*val = st->fclk / *val = st->fclk /
(st->f_order * 1024 * AD7192_MODE_RATE(st->mode)); (st->f_order * 1024 * AD7192_MODE_RATE(st->mode));
return IIO_VAL_INT; return IIO_VAL_INT;
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
*val = ad7192_get_3db_filter_freq(st);
*val2 = 1000;
return IIO_VAL_FRACTIONAL;
} }
return -EINVAL; return -EINVAL;
...@@ -535,6 +645,9 @@ static int ad7192_write_raw(struct iio_dev *indio_dev, ...@@ -535,6 +645,9 @@ static int ad7192_write_raw(struct iio_dev *indio_dev,
st->mode |= AD7192_MODE_RATE(div); st->mode |= AD7192_MODE_RATE(div);
ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode); ad_sd_write_reg(&st->sd, AD7192_REG_MODE, 3, st->mode);
break; break;
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
ret = ad7192_set_3db_filter_freq(st, val, val2 / 1000);
break;
default: default:
ret = -EINVAL; ret = -EINVAL;
} }
...@@ -553,6 +666,8 @@ static int ad7192_write_raw_get_fmt(struct iio_dev *indio_dev, ...@@ -553,6 +666,8 @@ static int ad7192_write_raw_get_fmt(struct iio_dev *indio_dev,
return IIO_VAL_INT_PLUS_NANO; return IIO_VAL_INT_PLUS_NANO;
case IIO_CHAN_INFO_SAMP_FREQ: case IIO_CHAN_INFO_SAMP_FREQ:
return IIO_VAL_INT; return IIO_VAL_INT;
case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
return IIO_VAL_INT_PLUS_MICRO;
default: default:
return -EINVAL; return -EINVAL;
} }
...@@ -653,6 +768,8 @@ static int ad7192_channels_config(struct iio_dev *indio_dev) ...@@ -653,6 +768,8 @@ static int ad7192_channels_config(struct iio_dev *indio_dev)
for (i = 0; i < indio_dev->num_channels; i++) { for (i = 0; i < indio_dev->num_channels; i++) {
*chan = channels[i]; *chan = channels[i];
chan->info_mask_shared_by_all |=
BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY);
if (chan->type != IIO_TEMP) if (chan->type != IIO_TEMP)
chan->info_mask_shared_by_type_available |= chan->info_mask_shared_by_type_available |=
BIT(IIO_CHAN_INFO_SCALE); BIT(IIO_CHAN_INFO_SCALE);
......
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