[PATCH v4 3/3] iio: Add driver for Murata IRS-D200

Waqar Hameed
2023-07-19T07:54:20Z

Murata IRS-D200 is a PIR sensor for human detection. It has support for
raw data measurements and detection event notification.

Add a driver with support for triggered buffer and events. Map the
various settings to the `iio` framework, e.g. threshold values, sampling
frequency, filter frequencies etc.

Signed-off-by: Waqar Hameed <waqar.hameed@axis.com>
---
drivers/iio/proximity/Kconfig | 12 +
drivers/iio/proximity/Makefile | 1 +
drivers/iio/proximity/irsd200.c | 962 ++++++++++++++++++++++++++++++++
3 files changed, 975 insertions(+)
create mode 100644 drivers/iio/proximity/irsd200.c

diff --git a/drivers/iio/proximity/Kconfig b/drivers/iio/proximity/Kconfig
index 0e5c17530b8b..2ca3b0bc5eba 100644
--- a/drivers/iio/proximity/Kconfig
+++ b/drivers/iio/proximity/Kconfig
@@ -32,6 +32,18 @@ config CROS_EC_MKBP_PROXIMITY
To compile this driver as a module, choose M here: the
module will be called cros_ec_mkbp_proximity.

+config IRSD200
+ tristate "Murata IRS-D200 PIR sensor"
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
+ select REGMAP_I2C
+ depends on I2C
+ help
+ Say Y here to build a driver for the Murata IRS-D200 PIR sensor.
+
+ To compile this driver as a module, choose M here: the module will be
+ called irsd200.
+
config ISL29501
tristate "Intersil ISL29501 Time Of Flight sensor"
depends on I2C
diff --git a/drivers/iio/proximity/Makefile b/drivers/iio/proximity/Makefile
index cc838bb5408a..f36598380446 100644
--- a/drivers/iio/proximity/Makefile
+++ b/drivers/iio/proximity/Makefile
@@ -6,6 +6,7 @@
# When adding new entries keep the list in alphabetical order
obj-$(CONFIG_AS3935) += as3935.o
obj-$(CONFIG_CROS_EC_MKBP_PROXIMITY) += cros_ec_mkbp_proximity.o
+obj-$(CONFIG_IRSD200) += irsd200.o
obj-$(CONFIG_ISL29501) += isl29501.o
obj-$(CONFIG_LIDAR_LITE_V2) += pulsedlight-lidar-lite-v2.o
obj-$(CONFIG_MB1232) += mb1232.o
diff --git a/drivers/iio/proximity/irsd200.c b/drivers/iio/proximity/irsd200.c
new file mode 100644
index 000000000000..19f7eb2a3ded
--- /dev/null
+++ b/drivers/iio/proximity/irsd200.c
@@ -0,0 +1,962 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Driver for Murata IRS-D200 PIR sensor.
+ *
+ * Copyright (C) 2023 Axis Communications AB
+ */
+
+#include <asm/unaligned.h>
+#include <linux/bitfield.h>
+#include <linux/gpio.h>
+#include <linux/i2c.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+
+#include <linux/iio/buffer.h>
+#include <linux/iio/events.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/trigger.h>
+#include <linux/iio/trigger_consumer.h>
+#include <linux/iio/triggered_buffer.h>
+#include <linux/iio/types.h>
+
+#define IRS_DRV_NAME "irsd200"
+
+/* Registers. */
+#define IRS_REG_OP 0x00 /* Operation mode. */
+#define IRS_REG_DATA_LO 0x02 /* Sensor data LSB. */
+#define IRS_REG_DATA_HI 0x03 /* Sensor data MSB. */
+#define IRS_REG_STATUS 0x04 /* Interrupt status. */
+#define IRS_REG_COUNT 0x05 /* Count of exceeding threshold. */
+#define IRS_REG_DATA_RATE 0x06 /* Output data rate. */
+#define IRS_REG_FILTER 0x07 /* High-pass and low-pass filter. */
+#define IRS_REG_INTR 0x09 /* Interrupt mode. */
+#define IRS_REG_NR_COUNT 0x0a /* Number of counts before interrupt. */
+#define IRS_REG_THR_HI 0x0b /* Upper threshold. */
+#define IRS_REG_THR_LO 0x0c /* Lower threshold. */
+#define IRS_REG_TIMER_LO 0x0d /* Timer setting LSB. */
+#define IRS_REG_TIMER_HI 0x0e /* Timer setting MSB. */
+
+/* Interrupt status bits. */
+#define IRS_INTR_DATA 0 /* Data update. */
+#define IRS_INTR_TIMER 1 /* Timer expiration. */
+#define IRS_INTR_COUNT_THR_AND 2 /* Count "AND" threshold. */
+#define IRS_INTR_COUNT_THR_OR 3 /* Count "OR" threshold. */
+
+/* Operation states. */
+#define IRS_OP_ACTIVE 0x00
+#define IRS_OP_SLEEP 0x01
+
+/*
+ * Quantization scale value for threshold. Used for conversion from/to register
+ * value.
+ */
+#define IRS_THR_QUANT_SCALE 128
+
+#define IRS_UPPER_COUNT(count) FIELD_GET(GENMASK(7, 4), count)
+#define IRS_LOWER_COUNT(count) FIELD_GET(GENMASK(3, 0), count)
+
+/* Index corresponds to the value of IRS_REG_DATA_RATE register. */
+static const int irsd200_data_rates[] = {
+ 50,
+ 100,
+};
+
+/* Index corresponds to the (field) value of IRS_REG_FILTER register. */
+static const unsigned int irsd200_lp_filter_freq[] = {
+ 10,
+ 7,
+};
+
+/*
+ * Index corresponds to the (field) value of IRS_REG_FILTER register. Note that
+ * this represents a fractional value (e.g the first value corresponds to 3 / 10
+ * = 0.3 Hz).
+ */
+static const unsigned int irsd200_hp_filter_freq[][2] = {
+ {3, 10},
+ {5, 10},
+};
+
+/* Register fields. */
+enum irsd200_regfield {
+ /* Data interrupt. */
+ IRS_REGF_INTR_DATA,
+ /* Timer interrupt. */
+ IRS_REGF_INTR_TIMER,
+ /* AND count threshold interrupt. */
+ IRS_REGF_INTR_COUNT_THR_AND,
+ /* OR count threshold interrupt. */
+ IRS_REGF_INTR_COUNT_THR_OR,
+
+ /* Low-pass filter frequency. */
+ IRS_REGF_LP_FILTER,
+ /* High-pass filter frequency. */
+ IRS_REGF_HP_FILTER,
+
+ /* Sentinel value. */
+ IRS_REGF_MAX
+};
+
+static const struct reg_field irsd200_regfields[] = {
+ [IRS_REGF_INTR_DATA] =
+ REG_FIELD(IRS_REG_INTR, IRS_INTR_DATA, IRS_INTR_DATA),
+ [IRS_REGF_INTR_TIMER] =
+ REG_FIELD(IRS_REG_INTR, IRS_INTR_TIMER, IRS_INTR_TIMER),
+ [IRS_REGF_INTR_COUNT_THR_AND] = REG_FIELD(
+ IRS_REG_INTR, IRS_INTR_COUNT_THR_AND, IRS_INTR_COUNT_THR_AND),
+ [IRS_REGF_INTR_COUNT_THR_OR] = REG_FIELD(
+ IRS_REG_INTR, IRS_INTR_COUNT_THR_OR, IRS_INTR_COUNT_THR_OR),
+
+ [IRS_REGF_LP_FILTER] = REG_FIELD(IRS_REG_FILTER, 1, 1),
+ [IRS_REGF_HP_FILTER] = REG_FIELD(IRS_REG_FILTER, 0, 0),
+};
+
+static const struct regmap_config irsd200_regmap_config = {
+ .reg_bits = 8,
+ .val_bits = 8,
+ .max_register = IRS_REG_TIMER_HI,
+};
+
+struct irsd200_data {
+ struct regmap *regmap;
+ struct regmap_field *regfields[IRS_REGF_MAX];
+ struct device *dev;
+};
+
+static int irsd200_setup(struct irsd200_data *data)
+{
+ unsigned int val;
+ int ret;
+
+ /* Disable all interrupt sources. */
+ ret = regmap_write(data->regmap, IRS_REG_INTR, 0);
+ if (ret) {
+ dev_err(data->dev, "Could not set interrupt sources (%d)\n",
+ ret);
+ return ret;
+ }
+
+ /* Set operation to active. */
+ ret = regmap_write(data->regmap, IRS_REG_OP, IRS_OP_ACTIVE);
+ if (ret) {
+ dev_err(data->dev, "Could not set operation mode (%d)\n", ret);
+ return ret;
+ }
+
+ /* Clear threshold count. */
+ ret = regmap_read(data->regmap, IRS_REG_COUNT, &val);
+ if (ret) {
+ dev_err(data->dev, "Could not clear threshold count (%d)\n",
+ ret);
+ return ret;
+ }
+
+ /* Clear status. */
+ ret = regmap_write(data->regmap, IRS_REG_STATUS, 0x0f);
+ if (ret) {
+ dev_err(data->dev, "Could not clear status (%d)\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int irsd200_read_threshold(struct irsd200_data *data,
+ enum iio_event_direction dir, int *val)
+{
+ unsigned int regval;
+ unsigned int reg;
+ int scale;
+ int ret;
+
+ /* Set quantization scale. */
+ if (dir == IIO_EV_DIR_RISING) {
+ scale = IRS_THR_QUANT_SCALE;
+ reg = IRS_REG_THR_HI;
+ } else if (dir == IIO_EV_DIR_FALLING) {
+ scale = -IRS_THR_QUANT_SCALE;
+ reg = IRS_REG_THR_LO;
+ } else {
+ return -EINVAL;
+ }
+
+ ret = regmap_read(data->regmap, reg, &regval);
+ if (ret) {
+ dev_err(data->dev, "Could not read threshold (%d)\n", ret);
+ return ret;
+ }
+
+ *val = ((int)regval) * scale;
+
+ return 0;
+}
+
+static int irsd200_write_threshold(struct irsd200_data *data,
+ enum iio_event_direction dir, int val)
+{
+ unsigned int regval;
+ unsigned int reg;
+ int scale;
+ int ret;
+
+ /* Set quantization scale. */
+ if (dir == IIO_EV_DIR_RISING) {
+ if (val < 0)
+ return -ERANGE;
+
+ scale = IRS_THR_QUANT_SCALE;
+ reg = IRS_REG_THR_HI;
+ } else if (dir == IIO_EV_DIR_FALLING) {
+ if (val > 0)
+ return -ERANGE;
+
+ scale = -IRS_THR_QUANT_SCALE;
+ reg = IRS_REG_THR_LO;
+ } else {
+ return -EINVAL;
+ }
+
+ regval = val / scale;
+
+ if (regval >= BIT(8))
+ return -ERANGE;
+
+ ret = regmap_write(data->regmap, reg, regval);
+ if (ret) {
+ dev_err(data->dev, "Could not write threshold (%d)\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int irsd200_read_data(struct irsd200_data *data, s16 *val)
+{
+ __le16 buf;
+ int ret;
+
+ ret = regmap_bulk_read(data->regmap, IRS_REG_DATA_LO, &buf,
+ sizeof(buf));
+ if (ret) {
+ dev_err(data->dev, "Could not bulk read data (%d)\n", ret);
+ return ret;
+ }
+
+ *val = le16_to_cpu(buf);
+
+ return 0;
+}
+
+static int irsd200_read_data_rate(struct irsd200_data *data, int *val)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(data->regmap, IRS_REG_DATA_RATE, &regval);
+ if (ret) {
+ dev_err(data->dev, "Could not read data rate (%d)\n", ret);
+ return ret;
+ }
+
+ if (regval >= ARRAY_SIZE(irsd200_data_rates))
+ return -ERANGE;
+
+ *val = irsd200_data_rates[regval];
+
+ return 0;
+}
+
+static int irsd200_write_data_rate(struct irsd200_data *data, int val)
+{
+ size_t idx;
+ int ret;
+
+ for (idx = 0; idx < ARRAY_SIZE(irsd200_data_rates); ++idx) {
+ if (irsd200_data_rates[idx] == val)
+ break;
+ }
+
+ if (idx == ARRAY_SIZE(irsd200_data_rates))
+ return -ERANGE;
+
+ ret = regmap_write(data->regmap, IRS_REG_DATA_RATE, idx);
+ if (ret) {
+ dev_err(data->dev, "Could not write data rate (%d)\n", ret);
+ return ret;
+ }
+
+ /*
+ * Data sheet says the device needs 3 seconds of settling time. The
+ * device operates normally during this period though. This is more of a
+ * "guarantee" than trying to prevent other user space reads/writes.
+ */
+ ssleep(3);
+
+ return 0;
+}
+
+static int irsd200_read_timer(struct irsd200_data *data, int *val, int *val2)
+{
+ __le16 buf;
+ int ret;
+
+ ret = regmap_bulk_read(data->regmap, IRS_REG_TIMER_LO, &buf,
+ sizeof(buf));
+ if (ret) {
+ dev_err(data->dev, "Could not bulk read timer (%d)\n", ret);
+ return ret;
+ }
+
+ ret = irsd200_read_data_rate(data, val2);
+ if (ret)
+ return ret;
+
+ *val = le16_to_cpu(buf);
+
+ return 0;
+}
+
+static int irsd200_write_timer(struct irsd200_data *data, int val, int val2)
+{
+ unsigned int regval;
+ int data_rate;
+ __le16 buf;
+ int ret;
+
+ if (val < 0 || val2 < 0)
+ return -ERANGE;
+
+ ret = irsd200_read_data_rate(data, &data_rate);
+ if (ret)
+ return ret;
+
+ /* Quantize from seconds. */
+ regval = val * data_rate + (val2 * data_rate) / 1000000;
+
+ /* Value is 10 bits. */
+ if (regval >= BIT(10))
+ return -ERANGE;
+
+ buf = cpu_to_le16((u16)regval);
+
+ ret = regmap_bulk_write(data->regmap, IRS_REG_TIMER_LO, &buf,
+ sizeof(buf));
+ if (ret) {
+ dev_err(data->dev, "Could not bulk write timer (%d)\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int irsd200_read_nr_count(struct irsd200_data *data, int *val)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_read(data->regmap, IRS_REG_NR_COUNT, &regval);
+ if (ret) {
+ dev_err(data->dev, "Could not read nr count (%d)\n", ret);
+ return ret;
+ }
+
+ *val = regval;
+
+ return 0;
+}
+
+static int irsd200_write_nr_count(struct irsd200_data *data, int val)
+{
+ unsigned int regval;
+ int ret;
+
+ /* A value of zero means that IRS_REG_STATUS is never set. */
+ if (val <= 0 || val >= 8)
+ return -ERANGE;
+
+ regval = val;
+
+ if (regval >= 2) {
+ /*
+ * According to the data sheet, timer must be also set in this
+ * case (i.e. be non-zero). Check and enforce that.
+ */
+ ret = irsd200_read_timer(data, &val, &val);
+ if (ret)
+ return ret;
+
+ if (val == 0) {
+ dev_err(data->dev,
+ "Timer must be non-zero when nr count is %u\n",
+ regval);
+ return -EPERM;
+ }
+ }
+
+ ret = regmap_write(data->regmap, IRS_REG_NR_COUNT, regval);
+ if (ret) {
+ dev_err(data->dev, "Could not write nr count (%d)\n", ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int irsd200_read_lp_filter(struct irsd200_data *data, int *val)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_field_read(data->regfields[IRS_REGF_LP_FILTER], &regval);
+ if (ret) {
+ dev_err(data->dev, "Could not read lp filter frequency (%d)\n",
+ ret);
+ return ret;
+ }
+
+ *val = irsd200_lp_filter_freq[regval];
+
+ return 0;
+}
+
+static int irsd200_write_lp_filter(struct irsd200_data *data, int val)
+{
+ size_t idx;
+ int ret;
+
+ for (idx = 0; idx < ARRAY_SIZE(irsd200_lp_filter_freq); ++idx) {
+ if (irsd200_lp_filter_freq[idx] == val)
+ break;
+ }
+
+ if (idx == ARRAY_SIZE(irsd200_lp_filter_freq))
+ return -ERANGE;
+
+ ret = regmap_field_write(data->regfields[IRS_REGF_LP_FILTER], idx);
+ if (ret) {
+ dev_err(data->dev, "Could not write lp filter frequency (%d)\n",
+ ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int irsd200_read_hp_filter(struct irsd200_data *data, int *val,
+ int *val2)
+{
+ unsigned int regval;
+ int ret;
+
+ ret = regmap_field_read(data->regfields[IRS_REGF_HP_FILTER], &regval);
+ if (ret) {
+ dev_err(data->dev, "Could not read hp filter frequency (%d)\n",
+ ret);
+ return ret;
+ }
+
+ *val = irsd200_hp_filter_freq[regval][0];
+ *val2 = irsd200_hp_filter_freq[regval][1];
+
+ return 0;
+}
+
+static int irsd200_write_hp_filter(struct irsd200_data *data, int val, int val2)
+{
+ size_t idx;
+ int ret;
+
+ /* Truncate fractional part to one digit. */
+ val2 /= 100000;
+
+ for (idx = 0; idx < ARRAY_SIZE(irsd200_hp_filter_freq); ++idx) {
+ if (irsd200_hp_filter_freq[idx][0] == val2)
+ break;
+ }
+
+ if (idx == ARRAY_SIZE(irsd200_hp_filter_freq) || val != 0)
+ return -ERANGE;
+
+ ret = regmap_field_write(data->regfields[IRS_REGF_HP_FILTER], idx);
+ if (ret) {
+ dev_err(data->dev, "Could not write hp filter frequency (%d)\n",
+ ret);
+ return ret;
+ }
+
+ return 0;
+}
+
+static int irsd200_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val,
+ int *val2, long mask)
+{
+ struct irsd200_data *data = iio_priv(indio_dev);
+ int ret;
+ s16 buf;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = irsd200_read_data(data, &buf);
+ if (ret)
+ return ret;
+
+ *val = buf;
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ ret = irsd200_read_data_rate(data, val);
+ if (ret)
+ return ret;
+
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+ ret = irsd200_read_lp_filter(data, val);
+ if (ret)
+ return ret;
+
+ return IIO_VAL_INT;
+ case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
+ ret = irsd200_read_hp_filter(data, val, val2);
+ if (ret)
+ return ret;
+
+ return IIO_VAL_FRACTIONAL;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int irsd200_read_avail(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ const int **vals, int *type, int *length,
+ long mask)
+{
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ *vals = irsd200_data_rates;
+ *type = IIO_VAL_INT;
+ *length = ARRAY_SIZE(irsd200_data_rates);
+ return IIO_AVAIL_LIST;
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+ *vals = irsd200_lp_filter_freq;
+ *type = IIO_VAL_INT;
+ *length = ARRAY_SIZE(irsd200_lp_filter_freq);
+ return IIO_AVAIL_LIST;
+ case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
+ *vals = (int *)irsd200_hp_filter_freq;
+ *type = IIO_VAL_FRACTIONAL;
+ *length = 2 * ARRAY_SIZE(irsd200_hp_filter_freq);
+ return IIO_AVAIL_LIST;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int irsd200_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int val,
+ int val2, long mask)
+{
+ struct irsd200_data *data = iio_priv(indio_dev);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ return irsd200_write_data_rate(data, val);
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+ return irsd200_write_lp_filter(data, val);
+ case IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY:
+ return irsd200_write_hp_filter(data, val, val2);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int irsd200_read_event(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)
+{
+ struct irsd200_data *data = iio_priv(indio_dev);
+ int ret;
+
+ switch (info) {
+ case IIO_EV_INFO_VALUE:
+ ret = irsd200_read_threshold(data, dir, val);
+ if (ret)
+ return ret;
+
+ return IIO_VAL_INT;
+ case IIO_EV_INFO_RUNNING_PERIOD:
+ ret = irsd200_read_timer(data, val, val2);
+ if (ret)
+ return ret;
+
+ return IIO_VAL_FRACTIONAL;
+ case IIO_EV_INFO_RUNNING_COUNT:
+ ret = irsd200_read_nr_count(data, val);
+ if (ret)
+ return ret;
+
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int irsd200_write_event(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)
+{
+ struct irsd200_data *data = iio_priv(indio_dev);
+
+ switch (info) {
+ case IIO_EV_INFO_VALUE:
+ return irsd200_write_threshold(data, dir, val);
+ case IIO_EV_INFO_RUNNING_PERIOD:
+ return irsd200_write_timer(data, val, val2);
+ case IIO_EV_INFO_RUNNING_COUNT:
+ return irsd200_write_nr_count(data, val);
+ default:
+ return -EINVAL;
+ }
+}
+
+static int irsd200_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 irsd200_data *data = iio_priv(indio_dev);
+ unsigned int val;
+ int ret;
+
+ switch (type) {
+ case IIO_EV_TYPE_THRESH:
+ ret = regmap_field_read(
+ data->regfields[IRS_REGF_INTR_COUNT_THR_OR], &val);
+ if (ret)
+ return ret;
+
+ return val;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int irsd200_write_event_config(struct iio_dev *indio_dev,
+ const struct iio_chan_spec *chan,
+ enum iio_event_type type,
+ enum iio_event_direction dir, int state)
+{
+ struct irsd200_data *data = iio_priv(indio_dev);
+ unsigned int tmp;
+ int ret;
+
+ switch (type) {
+ case IIO_EV_TYPE_THRESH:
+ /* Clear the count register (by reading from it). */
+ ret = regmap_read(data->regmap, IRS_REG_COUNT, &tmp);
+ if (ret)
+ return ret;
+
+ tmp = !!state;
+ ret = regmap_field_write(
+ data->regfields[IRS_REGF_INTR_COUNT_THR_OR], tmp);
+ if (ret)
+ return ret;
+
+ return 0;
+ default:
+ return -EINVAL;
+ }
+}
+
+static irqreturn_t irsd200_irq_thread(int irq, void *dev_id)
+{
+ struct iio_dev *indio_dev = dev_id;
+ struct irsd200_data *data = iio_priv(indio_dev);
+ enum iio_event_direction dir;
+ unsigned int lower_count;
+ unsigned int upper_count;
+ unsigned int status = 0;
+ unsigned int source = 0;
+ unsigned int clear = 0;
+ unsigned int count = 0;
+ int ret;
+
+ ret = regmap_read(data->regmap, IRS_REG_INTR, &source);
+ if (ret) {
+ dev_err(data->dev, "Could not read interrupt source (%d)\n",
+ ret);
+ return IRQ_HANDLED;
+ }
+
+ ret = regmap_read(data->regmap, IRS_REG_STATUS, &status);
+ if (ret) {
+ dev_err(data->dev, "Could not acknowledge interrupt (%d)\n",
+ ret);
+ return IRQ_HANDLED;
+ }
+
+ if (status & BIT(IRS_INTR_DATA) && iio_buffer_enabled(indio_dev)) {
+ iio_trigger_poll_nested(indio_dev->trig);
+ clear |= BIT(IRS_INTR_DATA);
+ }
+
+ if (status & BIT(IRS_INTR_COUNT_THR_OR) &&
+ source & BIT(IRS_INTR_COUNT_THR_OR)) {
+ /*
+ * The register value resets to zero after reading. We therefore
+ * need to read once and manually extract the lower and upper
+ * count register fields.
+ */
+ ret = regmap_read(data->regmap, IRS_REG_COUNT, &count);
+ if (ret)
+ dev_err(data->dev, "Could not read count (%d)\n", ret);
+
+ upper_count = IRS_UPPER_COUNT(count);
+ lower_count = IRS_LOWER_COUNT(count);
+
+ /*
+ * We only check the OR mode to be able to push events for
+ * rising and falling thresholds. AND mode is covered when both
+ * upper and lower count is non-zero, and is signaled with
+ * IIO_EV_DIR_EITHER.
+ */
+ if (upper_count && !lower_count)
+ dir = IIO_EV_DIR_RISING;
+ else if (!upper_count && lower_count)
+ dir = IIO_EV_DIR_FALLING;
+ else
+ dir = IIO_EV_DIR_EITHER;
+
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
+ IIO_EV_TYPE_THRESH, dir),
+ iio_get_time_ns(indio_dev));
+
+ /*
+ * The OR mode will always trigger when the AND mode does, but
+ * not vice versa. However, it seems like the AND bit needs to
+ * be cleared if data capture _and_ threshold count interrupts
+ * are desirable, even though it hasn't explicitly been selected
+ * (with IRS_REG_INTR). Either way, it doesn't hurt...
+ */
+ clear |= BIT(IRS_INTR_COUNT_THR_OR) |
+ BIT(IRS_INTR_COUNT_THR_AND);
+ }
+
+ if (clear) {
+ ret = regmap_write(data->regmap, IRS_REG_STATUS, clear);
+ if (ret)
+ dev_err(data->dev,
+ "Could not clear interrupt status (%d)\n", ret);
+ }
+
+ return clear ? IRQ_HANDLED : IRQ_NONE;
+}
+
+static irqreturn_t irsd200_trigger_handler(int irq, void *pollf)
+{
+ struct iio_dev *indio_dev = ((struct iio_poll_func *)pollf)->indio_dev;
+ struct irsd200_data *data = iio_priv(indio_dev);
+ s16 buf = 0;
+ int ret;
+
+ ret = irsd200_read_data(data, &buf);
+ if (ret)
+ goto end;
+
+ iio_push_to_buffers_with_timestamp(indio_dev, &buf,
+ iio_get_time_ns(indio_dev));
+
+end:
+ iio_trigger_notify_done(indio_dev->trig);
+
+ return IRQ_HANDLED;
+}
+
+static int irsd200_set_trigger_state(struct iio_trigger *trig, bool state)
+{
+ struct irsd200_data *data = iio_trigger_get_drvdata(trig);
+ int ret;
+
+ ret = regmap_field_write(data->regfields[IRS_REGF_INTR_DATA], state);
+ if (ret) {
+ dev_err(data->dev, "Could not %s data interrupt source (%d)\n",
+ state ? "enable" : "disable", ret);
+ }
+
+ return ret;
+}
+
+static const struct iio_info irsd200_info = {
+ .read_raw = irsd200_read_raw,
+ .read_avail = irsd200_read_avail,
+ .write_raw = irsd200_write_raw,
+ .read_event_value = irsd200_read_event,
+ .write_event_value = irsd200_write_event,
+ .read_event_config = irsd200_read_event_config,
+ .write_event_config = irsd200_write_event_config,
+};
+
+static const struct iio_trigger_ops irsd200_trigger_ops = {
+ .set_trigger_state = irsd200_set_trigger_state,
+ .validate_device = iio_trigger_validate_own_device,
+};
+
+static const struct iio_event_spec irsd200_event_spec[] = {
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_RISING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE),
+ },
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_FALLING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE),
+ },
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_EITHER,
+ .mask_separate =
+ BIT(IIO_EV_INFO_RUNNING_PERIOD) |
+ BIT(IIO_EV_INFO_RUNNING_COUNT) |
+ BIT(IIO_EV_INFO_ENABLE),
+ },
+};
+
+static const struct iio_chan_spec irsd200_channels[] = {
+ {
+ .type = IIO_PROXIMITY,
+ .info_mask_separate =
+ BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SAMP_FREQ) |
+ BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY) |
+ BIT(IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY),
+ .info_mask_separate_available =
+ BIT(IIO_CHAN_INFO_SAMP_FREQ) |
+ BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY) |
+ BIT(IIO_CHAN_INFO_HIGH_PASS_FILTER_3DB_FREQUENCY),
+ .event_spec = irsd200_event_spec,
+ .num_event_specs = ARRAY_SIZE(irsd200_event_spec),
+ .scan_type = {
+ .sign = 's',
+ .realbits = 16,
+ .storagebits = 16,
+ .endianness = IIO_CPU,
+ },
+ },
+};
+
+static int irsd200_probe(struct i2c_client *client)
+{
+ struct iio_trigger *trigger;
+ struct irsd200_data *data;
+ struct iio_dev *indio_dev;
+ size_t i;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+ if (!indio_dev)
+ return dev_err_probe(&client->dev, -ENOMEM,
+ "Could not allocate iio device\n");
+
+ data = iio_priv(indio_dev);
+ data->dev = &client->dev;
+
+ data->regmap = devm_regmap_init_i2c(client, &irsd200_regmap_config);
+ if (IS_ERR(data->regmap))
+ return dev_err_probe(data->dev, PTR_ERR(data->regmap),
+ "Could not initialize regmap\n");
+
+ for (i = 0; i < IRS_REGF_MAX; ++i) {
+ data->regfields[i] = devm_regmap_field_alloc(
+ data->dev, data->regmap, irsd200_regfields[i]);
+ if (IS_ERR(data->regfields[i]))
+ return dev_err_probe(
+ data->dev, PTR_ERR(data->regfields[i]),
+ "Could not allocate register field %zu\n", i);
+ }
+
+ ret = devm_regulator_get_enable(data->dev, "vdd");
+ if (ret)
+ return dev_err_probe(
+ data->dev, ret,
+ "Could not get and enable regulator (%d)\n", ret);
+
+ ret = irsd200_setup(data);
+ if (ret)
+ return ret;
+
+ indio_dev->info = &irsd200_info;
+ indio_dev->name = IRS_DRV_NAME;
+ indio_dev->channels = irsd200_channels;
+ indio_dev->num_channels = ARRAY_SIZE(irsd200_channels);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ if (!client->irq)
+ return dev_err_probe(data->dev, -ENXIO, "No irq available\n");
+
+ ret = devm_iio_triggered_buffer_setup(data->dev, indio_dev, NULL,
+ irsd200_trigger_handler, NULL);
+ if (ret)
+ return dev_err_probe(
+ data->dev, ret,
+ "Could not setup iio triggered buffer (%d)\n", ret);
+
+ ret = devm_request_threaded_irq(data->dev, client->irq, NULL,
+ irsd200_irq_thread,
+ IRQF_TRIGGER_RISING | IRQF_ONESHOT,
+ NULL, indio_dev);
+ if (ret)
+ return dev_err_probe(data->dev, ret,
+ "Could not request irq (%d)\n", ret);
+
+ trigger = devm_iio_trigger_alloc(data->dev, "%s-dev%d", indio_dev->name,
+ iio_device_id(indio_dev));
+ if (!trigger)
+ return dev_err_probe(data->dev, -ENOMEM,
+ "Could not allocate iio trigger\n");
+
+ trigger->ops = &irsd200_trigger_ops;
+ iio_trigger_set_drvdata(trigger, data);
+
+ ret = devm_iio_trigger_register(data->dev, trigger);
+ if (ret)
+ return dev_err_probe(data->dev, ret,
+ "Could not register iio trigger (%d)\n",
+ ret);
+
+ ret = devm_iio_device_register(data->dev, indio_dev);
+ if (ret)
+ return dev_err_probe(data->dev, ret,
+ "Could not register iio device (%d)\n",
+ ret);
+
+ return 0;
+}
+
+static const struct of_device_id irsd200_of_match[] = {
+ {
+ .compatible = "murata,irsd200",
+ },
+ {}
+};
+MODULE_DEVICE_TABLE(of, irsd200_of_match);
+
+static struct i2c_driver irsd200_driver = {
+ .driver = {
+ .name = IRS_DRV_NAME,
+ .of_match_table = irsd200_of_match,
+ },
+ .probe = irsd200_probe,
+};
+module_i2c_driver(irsd200_driver);
+
+MODULE_AUTHOR("Waqar Hameed <waqar.hameed@axis.com>");
+MODULE_DESCRIPTION("Murata IRS-D200 PIR sensor driver");
+MODULE_LICENSE("GPL");
--
2.30.2