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path: root/drivers/iio/adc/ad7606.c
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Diffstat (limited to 'drivers/iio/adc/ad7606.c')
-rw-r--r--drivers/iio/adc/ad7606.c120
1 files changed, 99 insertions, 21 deletions
diff --git a/drivers/iio/adc/ad7606.c b/drivers/iio/adc/ad7606.c
index ebb8de03bbce..24c70c3cefb4 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
};
@@ -39,6 +39,10 @@ static const unsigned int ad7606_oversampling_avail[7] = {
1, 2, 4, 8, 16, 32, 64,
};
+static const unsigned int ad7616_oversampling_avail[8] = {
+ 1, 2, 4, 8, 16, 32, 64, 128,
+};
+
static int ad7606_reset(struct ad7606_state *st)
{
if (st->gpio_reset) {
@@ -154,7 +158,7 @@ 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 +167,31 @@ 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 +207,7 @@ 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 +216,20 @@ 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];
+
+ /* AD7616 requires a reset to update value */
+ if (st->chip_info->os_req_reset)
+ ad7606_reset(st);
+
+ st->oversampling = st->oversampling_avail[i];
mutex_unlock(&st->lock);
return 0;
@@ -219,11 +238,23 @@ 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 +263,7 @@ 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,
};
@@ -292,6 +323,36 @@ static const struct iio_chan_spec ad7606_channels[] = {
AD7606_CHANNEL(7),
};
+/*
+ * The current assumption that this driver makes for AD7616, is that it's
+ * working in Hardware Mode with Serial, Burst and Sequencer modes activated.
+ * To activate them, following pins must be pulled high:
+ * -SER/PAR
+ * -SEQEN
+ * And following pins must be pulled low:
+ * -WR/BURST
+ * -DB4/SER1W
+ */
+static const struct iio_chan_spec ad7616_channels[] = {
+ IIO_CHAN_SOFT_TIMESTAMP(16),
+ AD7606_CHANNEL(0),
+ AD7606_CHANNEL(1),
+ AD7606_CHANNEL(2),
+ AD7606_CHANNEL(3),
+ AD7606_CHANNEL(4),
+ AD7606_CHANNEL(5),
+ AD7606_CHANNEL(6),
+ AD7606_CHANNEL(7),
+ AD7606_CHANNEL(8),
+ AD7606_CHANNEL(9),
+ AD7606_CHANNEL(10),
+ AD7606_CHANNEL(11),
+ AD7606_CHANNEL(12),
+ AD7606_CHANNEL(13),
+ AD7606_CHANNEL(14),
+ AD7606_CHANNEL(15),
+};
+
static const struct ad7606_chip_info ad7606_chip_info_tbl[] = {
/* More devices added in future */
[ID_AD7605_4] = {
@@ -301,17 +362,27 @@ 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),
+ },
+ [ID_AD7616] = {
+ .channels = ad7616_channels,
+ .num_channels = 17,
+ .oversampling_avail = ad7616_oversampling_avail,
+ .oversampling_num = ARRAY_SIZE(ad7616_oversampling_avail),
+ .os_req_reset = true,
},
};
@@ -343,7 +414,7 @@ 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 +538,8 @@ 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 +557,11 @@ 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;
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