Adds support for IIO Events. Optionally, gp0 is assigned as Threshold
Either signal, if not present, fallback to an I3C IBI with the same
role.
Signed-off-by: Jorge Marques <jorge.marques@analog.com>
---
drivers/iio/adc/ad4062.c | 407 ++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 406 insertions(+), 1 deletion(-)
diff --git a/drivers/iio/adc/ad4062.c b/drivers/iio/adc/ad4062.c
index afc8b6969cf08..2084f0058627d 100644
--- a/drivers/iio/adc/ad4062.c
+++ b/drivers/iio/adc/ad4062.c
@@ -14,7 +14,9 @@
#include <linux/i3c/device.h>
#include <linux/i3c/master.h>
#include <linux/iio/buffer.h>
+#include <linux/iio/events.h>
#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
#include <linux/iio/trigger.h>
#include <linux/iio/trigger_consumer.h>
#include <linux/iio/triggered_buffer.h>
@@ -51,14 +53,22 @@
#define AD4062_REG_ADC_CONFIG_SCALE_EN_MSK BIT(4)
#define AD4062_REG_AVG_CONFIG 0x23
#define AD4062_REG_GP_CONF 0x24
+#define AD4062_REG_GP_CONF_MODE_MSK_0 GENMASK(2, 0)
#define AD4062_REG_GP_CONF_MODE_MSK_1 GENMASK(6, 4)
#define AD4062_REG_INTR_CONF 0x25
+#define AD4062_REG_INTR_CONF_EN_MSK_0 GENMASK(1, 0)
#define AD4062_REG_INTR_CONF_EN_MSK_1 GENMASK(5, 4)
#define AD4062_REG_TIMER_CONFIG 0x27
#define AD4062_REG_TIMER_CONFIG_FS_MASK GENMASK(7, 4)
+#define AD4062_REG_MAX_LIMIT 0x29
+#define AD4062_REG_MIN_LIMIT 0x2B
+#define AD4062_REG_MAX_HYST 0x2C
+#define AD4062_REG_MIN_HYST 0x2D
#define AD4062_REG_MON_VAL 0x2F
#define AD4062_REG_ADC_IBI_EN 0x31
#define AD4062_REG_ADC_IBI_EN_CONV_TRIGGER BIT(2)
+#define AD4062_REG_ADC_IBI_EN_MAX BIT(1)
+#define AD4062_REG_ADC_IBI_EN_MIN BIT(0)
#define AD4062_REG_FUSE_CRC 0x40
#define AD4062_REG_DEVICE_STATUS 0x41
#define AD4062_REG_DEVICE_STATUS_DEVICE_RESET BIT(6)
@@ -78,9 +88,13 @@
#define AD4060_PROD_ID 0x7A
#define AD4062_PROD_ID 0x7C
+#define AD4062_GP_INTR 0x1
#define AD4062_GP_DRDY 0x2
+#define AD4062_LIMIT_BITS 12
+
#define AD4062_INTR_EN_NEITHER 0x0
+#define AD4062_INTR_EN_EITHER 0x3
#define AD4062_TCONV_NS 270
@@ -149,10 +163,12 @@ struct ad4062_state {
struct iio_dev *indio_dev;
struct i3c_device *i3cdev;
struct regmap *regmap;
+ bool wait_event;
int vref_uV;
unsigned int samp_freqs[ARRAY_SIZE(ad4062_conversion_freqs)];
bool gpo_irq[2];
u16 sampling_frequency;
+ u16 events_frequency;
u8 oversamp_ratio;
u8 conv_sizeof;
u8 conv_addr;
@@ -188,6 +204,26 @@ static const struct regmap_access_table ad4062_regmap_wr_table = {
.n_yes_ranges = ARRAY_SIZE(ad4062_regmap_wr_ranges),
};
+static const struct iio_event_spec ad4062_events[] = {
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_EITHER,
+ .mask_shared_by_all = BIT(IIO_EV_INFO_ENABLE),
+ },
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_RISING,
+ .mask_shared_by_all = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_HYSTERESIS),
+ },
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_FALLING,
+ .mask_shared_by_all = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_HYSTERESIS),
+ },
+};
+
#define AD4062_CHAN(bits) { \
.type = IIO_VOLTAGE, \
.info_mask_shared_by_type = BIT(IIO_CHAN_INFO_RAW) | \
@@ -199,6 +235,8 @@ static const struct regmap_access_table ad4062_regmap_wr_table = {
.info_mask_shared_by_all_available = BIT(IIO_CHAN_INFO_SAMP_FREQ), \
.indexed = 1, \
.channel = 0, \
+ .event_spec = ad4062_events, \
+ .num_event_specs = ARRAY_SIZE(ad4062_events), \
.has_ext_scan_type = 1, \
.ext_scan_type = ad4062_scan_type_##bits##_s, \
.num_ext_scan_type = ARRAY_SIZE(ad4062_scan_type_##bits##_s), \
@@ -218,6 +256,73 @@ static const struct ad4062_chip_info ad4062_chip_info = {
.avg_max = 4096,
};
+static ssize_t sampling_frequency_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ struct ad4062_state *st = iio_priv(dev_to_iio_dev(dev));
+
+ return sysfs_emit(buf, "%d\n", ad4062_conversion_freqs[st->events_frequency]);
+}
+
+static int sampling_frequency_store_dispatch(struct iio_dev *indio_dev,
+ const char *buf)
+{
+ struct ad4062_state *st = iio_priv(indio_dev);
+ int val, ret;
+
+ if (st->wait_event)
+ return -EBUSY;
+
+ ret = kstrtoint(buf, 10, &val);
+ if (ret)
+ return ret;
+
+ st->events_frequency = find_closest_descending(val, ad4062_conversion_freqs,
+ ARRAY_SIZE(ad4062_conversion_freqs));
+ return 0;
+}
+
+static ssize_t sampling_frequency_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t len)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ int ret;
+
+ if (!iio_device_claim_direct(indio_dev))
+ return -EBUSY;
+
+ ret = sampling_frequency_store_dispatch(indio_dev, buf);
+ iio_device_release_direct(indio_dev);
+ return ret ?: len;
+}
+
+static IIO_DEVICE_ATTR_RW(sampling_frequency, 0);
+
+static ssize_t sampling_frequency_available_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ int ret = 0;
+
+ for (u8 i = 0; i < ARRAY_SIZE(ad4062_conversion_freqs); i++)
+ ret += sysfs_emit_at(buf, ret, "%d%s", ad4062_conversion_freqs[i],
+ i != (ARRAY_SIZE(ad4062_conversion_freqs) - 1) ? " " : "\n");
+ return ret;
+}
+
+static IIO_DEVICE_ATTR_RO(sampling_frequency_available, 0);
+
+static struct attribute *ad4062_event_attributes[] = {
+ &iio_dev_attr_sampling_frequency.dev_attr.attr,
+ &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group ad4062_event_attribute_group = {
+ .attrs = ad4062_event_attributes,
+};
+
static int ad4062_set_oversampling_ratio(struct ad4062_state *st, int val, int val2)
{
const u32 _max = st->chip->avg_max;
@@ -344,9 +449,11 @@ static int ad4062_conversion_frequency_set(struct ad4062_state *st, u8 val)
static int ad4062_set_operation_mode(struct ad4062_state *st,
enum ad4062_operation_mode mode)
{
+ const unsigned int samp_freq = mode == AD4062_MONITOR_MODE ?
+ st->events_frequency : st->sampling_frequency;
int ret;
- ret = ad4062_conversion_frequency_set(st, st->sampling_frequency);
+ ret = ad4062_conversion_frequency_set(st, samp_freq);
if (ret)
return ret;
@@ -355,6 +462,17 @@ static int ad4062_set_operation_mode(struct ad4062_state *st,
if (ret)
return ret;
+ if (mode == AD4062_MONITOR_MODE) {
+ /* Change address pointer to enter monitor mode */
+ struct i3c_priv_xfer xfer_trigger = {
+ .data.out = &st->conv_addr,
+ .len = sizeof(st->conv_addr),
+ .rnw = false,
+ };
+ st->conv_addr = AD4062_REG_CONV_TRIGGER_32BITS;
+ return i3c_device_do_priv_xfers(st->i3cdev, &xfer_trigger, 1);
+ }
+
return regmap_write(st->regmap, AD4062_REG_MODE_SET,
AD4062_REG_MODE_SET_ENTER_ADC);
}
@@ -385,6 +503,13 @@ static int ad4062_setup(struct iio_dev *indio_dev, struct iio_chan_spec const *c
if (IS_ERR(scan_type))
return PTR_ERR(scan_type);
+ ret = regmap_update_bits(st->regmap, AD4062_REG_GP_CONF,
+ AD4062_REG_GP_CONF_MODE_MSK_0,
+ FIELD_PREP(AD4062_REG_GP_CONF_MODE_MSK_0,
+ AD4062_GP_INTR));
+ if (ret)
+ return ret;
+
ret = regmap_update_bits(st->regmap, AD4062_REG_GP_CONF,
AD4062_REG_GP_CONF_MODE_MSK_1,
FIELD_PREP(AD4062_REG_GP_CONF_MODE_MSK_1,
@@ -404,6 +529,13 @@ static int ad4062_setup(struct iio_dev *indio_dev, struct iio_chan_spec const *c
if (ret)
return ret;
+ ret = regmap_update_bits(st->regmap, AD4062_REG_INTR_CONF,
+ AD4062_REG_INTR_CONF_EN_MSK_0,
+ FIELD_PREP(AD4062_REG_INTR_CONF_EN_MSK_0,
+ AD4062_INTR_EN_EITHER));
+ if (ret)
+ return ret;
+
ret = regmap_update_bits(st->regmap, AD4062_REG_INTR_CONF,
AD4062_REG_INTR_CONF_EN_MSK_1,
FIELD_PREP(AD4062_REG_INTR_CONF_EN_MSK_1,
@@ -416,6 +548,19 @@ static int ad4062_setup(struct iio_dev *indio_dev, struct iio_chan_spec const *c
&st->buf.be16, sizeof(st->buf.be16));
}
+static irqreturn_t ad4062_irq_handler_thresh(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 0,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_EITHER),
+ iio_get_time_ns(indio_dev));
+
+ return IRQ_HANDLED;
+}
+
static irqreturn_t ad4062_irq_handler_drdy(int irq, void *private)
{
struct iio_dev *indio_dev = private;
@@ -434,6 +579,14 @@ static void ad4062_ibi_handler(struct i3c_device *i3cdev,
{
struct ad4062_state *st = i3cdev_get_drvdata(i3cdev);
+ if (st->wait_event) {
+ iio_push_event(st->indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_VOLTAGE, 0,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_EITHER),
+ iio_get_time_ns(st->indio_dev));
+ return;
+ }
if (iio_buffer_enabled(st->indio_dev))
iio_trigger_poll_nested(st->trigger);
else
@@ -529,6 +682,25 @@ static int ad4062_request_irq(struct iio_dev *indio_dev)
struct device *dev = &st->i3cdev->dev;
int ret;
+ ret = fwnode_irq_get_byname(dev_fwnode(&st->i3cdev->dev), "gp0");
+ if (ret == -EPROBE_DEFER)
+ return ret;
+
+ if (ret < 0) {
+ ret = regmap_update_bits(st->regmap, AD4062_REG_ADC_IBI_EN,
+ AD4062_REG_ADC_IBI_EN_MAX | AD4062_REG_ADC_IBI_EN_MIN,
+ AD4062_REG_ADC_IBI_EN_MAX | AD4062_REG_ADC_IBI_EN_MIN);
+ if (ret)
+ return ret;
+ } else {
+ ret = devm_request_threaded_irq(dev, ret, NULL,
+ ad4062_irq_handler_thresh,
+ IRQF_ONESHOT, indio_dev->name,
+ indio_dev);
+ if (ret)
+ return ret;
+ }
+
ret = fwnode_irq_get_byname(dev_fwnode(&st->i3cdev->dev), "gp1");
if (ret == -EPROBE_DEFER)
return ret;
@@ -720,6 +892,9 @@ static int ad4062_read_chan_raw(struct ad4062_state *st, int *val)
static int ad4062_read_raw_dispatch(struct ad4062_state *st,
int *val, int *val2, long info)
{
+ if (st->wait_event)
+ return -EBUSY;
+
switch (info) {
case IIO_CHAN_INFO_RAW:
return ad4062_read_chan_raw(st, val);
@@ -761,6 +936,9 @@ static int ad4062_read_raw(struct iio_dev *indio_dev,
static int ad4062_write_raw_dispatch(struct ad4062_state *st, int val, int val2,
long info)
{
+ if (st->wait_event)
+ return -EBUSY;
+
switch (info) {
case IIO_CHAN_INFO_OVERSAMPLING_RATIO:
return ad4062_set_oversampling_ratio(st, val, val2);
@@ -789,7 +967,224 @@ static int ad4062_write_raw(struct iio_dev *indio_dev,
return -EBUSY;
ret = ad4062_write_raw_dispatch(st, val, val2, info);
+ iio_device_release_direct(indio_dev);
+ return ret;
+}
+
+static int pm_ad4062_monitor_mode_enable(struct ad4062_state *st)
+{
+ int ret;
+
+ PM_RUNTIME_ACQUIRE(&st->i3cdev->dev, pm);
+ ret = PM_RUNTIME_ACQUIRE_ERR(&pm);
+ if (ret)
+ return ret;
+
+ return ad4062_set_operation_mode(st, AD4062_MONITOR_MODE);
+}
+
+static int ad4062_monitor_mode_enable(struct ad4062_state *st)
+{
+ int ret;
+
+ ret = pm_ad4062_monitor_mode_enable(st);
+ if (ret)
+ return ret;
+
+ pm_runtime_get_noresume(&st->i3cdev->dev);
+ return 0;
+}
+static int ad4062_monitor_mode_disable(struct ad4062_state *st)
+{
+ pm_runtime_put_autosuspend(&st->i3cdev->dev);
+ return 0;
+}
+
+static int ad4062_read_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir)
+{
+ struct ad4062_state *st = iio_priv(indio_dev);
+
+ return st->wait_event;
+}
+
+static int ad4062_write_event_config_dispatch(struct iio_dev *indio_dev,
+ bool state)
+{
+ struct ad4062_state *st = iio_priv(indio_dev);
+ int ret;
+
+ if (st->wait_event == state)
+ ret = 0;
+ else if (state)
+ ret = ad4062_monitor_mode_enable(st);
+ else
+ ret = ad4062_monitor_mode_disable(st);
+ if (ret)
+ return ret;
+
+ st->wait_event = state;
+ return 0;
+}
+
+static int ad4062_write_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ bool state)
+{
+ int ret;
+
+ if (!iio_device_claim_direct(indio_dev))
+ return -EBUSY;
+
+ ret = ad4062_write_event_config_dispatch(indio_dev, state);
+ iio_device_release_direct(indio_dev);
+ return ret;
+}
+
+static int __ad4062_read_event_info_value(struct ad4062_state *st,
+ enum iio_event_direction dir, int *val)
+{
+ int ret;
+ u8 reg;
+
+ if (dir == IIO_EV_DIR_RISING)
+ reg = AD4062_REG_MAX_LIMIT;
+ else
+ reg = AD4062_REG_MIN_LIMIT;
+
+ ret = regmap_bulk_read(st->regmap, reg, &st->buf.be16,
+ sizeof(st->buf.be16));
+ if (ret)
+ return ret;
+
+ *val = sign_extend32(be16_to_cpu(st->buf.be16), AD4062_LIMIT_BITS - 1);
+
+ return 0;
+}
+
+static int __ad4062_read_event_info_hysteresis(struct ad4062_state *st,
+ enum iio_event_direction dir, int *val)
+{
+ u8 reg;
+
+ if (dir == IIO_EV_DIR_RISING)
+ reg = AD4062_REG_MAX_HYST;
+ else
+ reg = AD4062_REG_MIN_HYST;
+ return regmap_read(st->regmap, reg, val);
+}
+
+static int ad4062_read_event_config_dispatch(struct iio_dev *indio_dev,
+ enum iio_event_direction dir,
+ enum iio_event_info info, int *val)
+{
+ struct ad4062_state *st = iio_priv(indio_dev);
+
+ if (st->wait_event)
+ return -EBUSY;
+
+ switch (info) {
+ case IIO_EV_INFO_VALUE:
+ return __ad4062_read_event_info_value(st, dir, val);
+ case IIO_EV_INFO_HYSTERESIS:
+ return __ad4062_read_event_info_hysteresis(st, dir, val);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ad4062_read_event_value(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info, int *val,
+ int *val2)
+{
+ int ret;
+
+ if (!iio_device_claim_direct(indio_dev))
+ return -EBUSY;
+
+ ret = ad4062_read_event_config_dispatch(indio_dev, dir, info, val);
+ iio_device_release_direct(indio_dev);
+ return ret ?: IIO_VAL_INT;
+}
+
+static int __ad4062_write_event_info_value(struct ad4062_state *st,
+ enum iio_event_direction dir, int val)
+{
+ u8 reg;
+
+ if (val != sign_extend32(val, AD4062_LIMIT_BITS - 1))
+ return -EINVAL;
+ if (dir == IIO_EV_DIR_RISING)
+ reg = AD4062_REG_MAX_LIMIT;
+ else
+ reg = AD4062_REG_MIN_LIMIT;
+ st->buf.be16 = cpu_to_be16(val);
+
+ return regmap_bulk_write(st->regmap, reg, &st->buf.be16,
+ sizeof(st->buf.be16));
+}
+
+static int __ad4062_write_event_info_hysteresis(struct ad4062_state *st,
+ enum iio_event_direction dir, int val)
+{
+ u8 reg;
+
+ if (val > BIT(7) - 1)
+ return -EINVAL;
+ if (dir == IIO_EV_DIR_RISING)
+ reg = AD4062_REG_MAX_HYST;
+ else
+ reg = AD4062_REG_MIN_HYST;
+
+ return regmap_write(st->regmap, reg, val);
+}
+
+static int ad4062_write_event_value_dispatch(struct iio_dev *indio_dev,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info, int val)
+{
+ struct ad4062_state *st = iio_priv(indio_dev);
+
+ if (st->wait_event)
+ return -EBUSY;
+
+ switch (type) {
+ case IIO_EV_TYPE_THRESH:
+ switch (info) {
+ case IIO_EV_INFO_VALUE:
+ return __ad4062_write_event_info_value(st, dir, val);
+ case IIO_EV_INFO_HYSTERESIS:
+ return __ad4062_write_event_info_hysteresis(st, dir, val);
+ default:
+ return -EINVAL;
+ }
+ default:
+ return -EINVAL;
+ }
+}
+
+static int ad4062_write_event_value(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir,
+ enum iio_event_info info, int val,
+ int val2)
+{
+ int ret;
+
+ if (!iio_device_claim_direct(indio_dev))
+ return -EBUSY;
+
+ ret = ad4062_write_event_value_dispatch(indio_dev, type, dir, info, val);
iio_device_release_direct(indio_dev);
return ret;
}
@@ -825,6 +1220,9 @@ static int pm_ad4062_triggered_buffer_postenable(struct ad4062_state *st)
if (ret)
return ret;
+ if (st->wait_event)
+ return -EBUSY;
+
ret = ad4062_set_operation_mode(st, st->mode);
if (ret)
return ret;
@@ -900,6 +1298,11 @@ static const struct iio_info ad4062_info = {
.read_raw = ad4062_read_raw,
.write_raw = ad4062_write_raw,
.read_avail = ad4062_read_avail,
+ .read_event_config = ad4062_read_event_config,
+ .write_event_config = ad4062_write_event_config,
+ .read_event_value = ad4062_read_event_value,
+ .write_event_value = ad4062_write_event_value,
+ .event_attrs = &ad4062_event_attribute_group,
.get_current_scan_type = ad4062_get_current_scan_type,
.debugfs_reg_access = ad4062_debugfs_reg_access,
};
@@ -980,8 +1383,10 @@ static int ad4062_probe(struct i3c_device *i3cdev)
"Failed to initialize regmap\n");
st->mode = AD4062_SAMPLE_MODE;
+ st->wait_event = false;
st->chip = chip;
st->sampling_frequency = 0;
+ st->events_frequency = 0;
st->oversamp_ratio = 0;
st->indio_dev = indio_dev;
--
2.51.1© 2016 - 2025 Red Hat, Inc.