[PATCH] iio: light: add driver support for MAX44009
From: Robert Eshleman
Date: Thu Jan 17 2019 - 01:57:34 EST
The MAX44009 is a low-power ambient light sensor from Maxim Integrated.
It differs from the MAX44000 in that it doesn't have proximity sensing and that
it requires far less current (1 micro-amp vs 5 micro-amps). The register
mapping and feature set between the two are different enough to require a new
driver for the MAX44009.
Developed and tested with a BeagleBone Black and UDOO Neo (i.MX6SX)
Supported features:
* Rising and falling illuminance threshold
events
* Illuminance triggered buffers
* Integration time
https://datasheets.maximintegrated.com/en/ds/MAX44009.pdf
Signed-off-by: Robert Eshleman <bobbyeshleman@xxxxxxxxx>
---
.../bindings/iio/light/max44009.txt | 25 +
drivers/iio/light/Kconfig | 13 +
drivers/iio/light/Makefile | 1 +
drivers/iio/light/max44009.c | 696 ++++++++++++++++++
4 files changed, 735 insertions(+)
create mode 100644 Documentation/devicetree/bindings/iio/light/max44009.txt
create mode 100644 drivers/iio/light/max44009.c
diff --git a/Documentation/devicetree/bindings/iio/light/max44009.txt b/Documentation/devicetree/bindings/iio/light/max44009.txt
new file mode 100644
index 000000000000..220c2808dca1
--- /dev/null
+++ b/Documentation/devicetree/bindings/iio/light/max44009.txt
@@ -0,0 +1,25 @@
+* MAX44009 Ambient Light Sensor
+
+Required properties:
+
+- compatible: should be "maxim,max44009"
+- reg: the I2C address of the device (default is <0x4a>)
+
+Optional properties:
+
+- interrupts : interrupt mapping for GPIO IRQ. Should be configured with
+ IRQ_TYPE_EDGE_FALLING.
+
+Refer to interrupt-controller/interrupts.txt for generic interrupt client
+node bindings.
+
+Example:
+
+max44009: max44009@4a {
+ compatible = "maxim,max44009";
+ reg = <0x4a>;
+
+ interrupt-parent = <&gpio1>;
+ interrupts = <17 IRQ_TYPE_EDGE_FALLING>;
+};
+
diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index 36f458433480..cda544f1047d 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -299,6 +299,19 @@ config MAX44000
To compile this driver as a module, choose M here:
the module will be called max44000.
+config MAX44009
+ tristate "MAX44009 Ambient Light Sensor"
+ depends on I2C
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
+ select IIO_TRIGGERED_EVENT
+ help
+ Say Y here if you want to build support for Maxim Integrated's
+ MAX44009 ambient light sensor device.
+
+ To compile this driver as a module, choose M here:
+ the module will be called max44009.
+
config OPT3001
tristate "Texas Instruments OPT3001 Light Sensor"
depends on I2C
diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
index 286bf3975372..e40794fbb435 100644
--- a/drivers/iio/light/Makefile
+++ b/drivers/iio/light/Makefile
@@ -28,6 +28,7 @@ obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o
obj-$(CONFIG_LTR501) += ltr501.o
obj-$(CONFIG_LV0104CS) += lv0104cs.o
obj-$(CONFIG_MAX44000) += max44000.o
+obj-$(CONFIG_MAX44009) += max44009.o
obj-$(CONFIG_OPT3001) += opt3001.o
obj-$(CONFIG_PA12203001) += pa12203001.o
obj-$(CONFIG_RPR0521) += rpr0521.o
diff --git a/drivers/iio/light/max44009.c b/drivers/iio/light/max44009.c
new file mode 100644
index 000000000000..e15aa8eeb2f6
--- /dev/null
+++ b/drivers/iio/light/max44009.c
@@ -0,0 +1,696 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * max44009.c - Support for MAX44009 Ambient Light Sensor
+ *
+ * Copyright (c) 2019 Robert Eshleman <bobbyeshleman@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ *
+ * Datasheet: https://datasheets.maximintegrated.com/en/ds/MAX44009.pdf
+ *
+ * TODO: Support continuous mode and processed event value (IIO_EV_INFO_VALUE)
+ *
+ * Default I2C address: 0x4a
+ *
+ */
+
+#include <linux/bits.h>
+#include <linux/i2c.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>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/regmap.h>
+#include <linux/util_macros.h>
+
+#define MAX44009_DRV_NAME "max44009"
+#define MAX44009_IRQ_NAME "max44009_event"
+
+/* Registers in datasheet order */
+#define MAX44009_REG_STATUS 0x0
+#define MAX44009_REG_ENABLE 0x1
+#define MAX44009_REG_CFG 0x2
+#define MAX44009_REG_LUX_HI 0x3
+#define MAX44009_REG_LUX_LO 0x4
+#define MAX44009_REG_UPPER_THR 0x5
+#define MAX44009_REG_LOWER_THR 0x6
+#define MAX44009_REG_THR_TIMER 0x7
+
+#define MAX44009_INT_TIME_MASK (BIT(2) | BIT(1) | BIT(0))
+#define MAX44009_INT_TIME_SHIFT (0)
+
+#define MAX44009_MANUAL_MODE_MASK BIT(6)
+
+/* The maxmimum raw rising threshold for the max44009 */
+#define MAX44009_MAXIMUM_THRESHOLD 8355840
+
+#define MAX44009_HI_NIBBLE(reg) (((reg) >> 4) & 0xf)
+#define MAX44009_LO_NIBBLE(reg) ((reg) & 0xf)
+
+#define MAX44009_EXP_MASK 0xf00
+#define MAX44009_EXP_RSHIFT 8
+#define MAX44009_LUX_EXP(reg) \
+ (1 << (((reg) & MAX44009_EXP_MASK) >> MAX44009_EXP_RSHIFT))
+#define MAX44009_LUX_MANT(reg) ((reg) & 0xff)
+
+#define MAX44009_LUX(reg) (MAX44009_LUX_EXP(reg) * MAX44009_LUX_MANT(reg))
+
+#define MAX44009_THRESH_MANT(reg) ((MAX44009_LO_NIBBLE(reg) << 4) + 15)
+#define MAX44009_THRESHOLD(reg) \
+ ((1 << MAX44009_HI_NIBBLE(reg)) * MAX44009_THRESH_MANT(reg))
+
+static const u32 max44009_int_time_ns_array[] = {
+ 800000000,
+ 400000000,
+ 200000000,
+ 100000000,
+ 50000000, /* Manual mode only */
+ 25000000, /* Manual mode only */
+ 12500000, /* Manual mode only */
+ 6250000, /* Manual mode only */
+};
+
+static const char max44009_int_time_str[] =
+ "0.8 "
+ "0.4 "
+ "0.2 "
+ "0.1 "
+ "0.05 "
+ "0.025 "
+ "0.0125 "
+ "0.00625";
+
+static const u8 max44009_scale_avail_ulux_array[] = {45};
+static const char max44009_scale_avail_str[] = "0.045";
+
+struct max44009_data {
+ struct i2c_client *client;
+ struct iio_trigger *trigger;
+ struct mutex lock;
+ int64_t timestamp;
+};
+
+static const struct iio_event_spec max44009_event_spec[] = {
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_RISING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_ENABLE),
+ },
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_FALLING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_ENABLE),
+ },
+};
+
+static const struct iio_chan_spec max44009_channels[] = {
+ {
+ .type = IIO_LIGHT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_INT_TIME),
+ .scan_index = 0,
+ .scan_type = {
+ .sign = 'u',
+ .realbits = 24,
+ .storagebits = 32,
+ },
+ .event_spec = max44009_event_spec,
+ .num_event_specs = ARRAY_SIZE(max44009_event_spec),
+ },
+ IIO_CHAN_SOFT_TIMESTAMP(1),
+};
+
+static int max44009_read_reg(struct max44009_data *data, char reg)
+{
+ struct i2c_client *client = data->client;
+ int ret;
+
+ mutex_lock(&data->lock);
+ ret = i2c_smbus_read_byte_data(client, reg);
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "failed to read reg 0x%0x, err: %d\n", reg, ret);
+ goto err;
+ }
+
+err:
+ mutex_unlock(&data->lock);
+ return ret;
+}
+
+static int max44009_write_reg(struct max44009_data *data, char reg, char buf)
+{
+ struct i2c_client *client = data->client;
+ int ret;
+
+ mutex_lock(&data->lock);
+ ret = i2c_smbus_write_byte_data(client, reg, buf);
+ if (ret < 0) {
+ dev_err(&client->dev,
+ "failed to write reg 0x%0x, err: %d\n",
+ reg, ret);
+ goto err;
+ }
+
+err:
+ mutex_unlock(&data->lock);
+ return ret;
+}
+
+static int max44009_read_int_time(struct max44009_data *data)
+{
+ int ret = max44009_read_reg(data, MAX44009_REG_CFG);
+
+ if (ret < 0) {
+ return ret;
+ }
+
+ return max44009_int_time_ns_array[ret & MAX44009_INT_TIME_MASK];
+}
+
+static int max44009_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int val,
+ int val2, long mask)
+{
+ struct max44009_data *data = iio_priv(indio_dev);
+ int ret, int_time;
+ s64 ns;
+
+ if (mask == IIO_CHAN_INFO_INT_TIME && chan->type == IIO_LIGHT) {
+ ns = val * NSEC_PER_SEC + val2;
+ int_time = find_closest_descending(
+ ns,
+ max44009_int_time_ns_array,
+ ARRAY_SIZE(max44009_int_time_ns_array));
+
+ ret = max44009_read_reg(data, MAX44009_REG_CFG);
+ if (ret < 0)
+ return ret;
+
+ ret &= ~MAX44009_INT_TIME_MASK;
+ ret |= (int_time << MAX44009_INT_TIME_SHIFT);
+ ret |= MAX44009_MANUAL_MODE_MASK;
+
+ return max44009_write_reg(data, MAX44009_REG_CFG, ret);
+ }
+ return -EINVAL;
+}
+
+static int max44009_write_raw_get_fmt(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ long mask)
+{
+ if (mask == IIO_CHAN_INFO_INT_TIME && chan->type == IIO_LIGHT) {
+ return IIO_VAL_INT_PLUS_NANO;
+ } else {
+ return IIO_VAL_INT;
+ }
+}
+
+#define READ_LUX_XFER_LEN (4)
+
+static int max44009_read_lux_raw(struct max44009_data *data)
+{
+ int ret;
+ struct i2c_msg xfer[READ_LUX_XFER_LEN];
+ u8 luxhireg[1] = {MAX44009_REG_LUX_HI};
+ u8 luxloreg[1] = {MAX44009_REG_LUX_LO};
+ u8 lo = 0;
+ u8 hi = 0;
+ u16 reg = 0;
+
+ xfer[0].addr = data->client->addr;
+ xfer[0].flags = 0;
+ xfer[0].len = 1;
+ xfer[0].buf = luxhireg;
+
+ xfer[1].addr = data->client->addr;
+ xfer[1].flags = I2C_M_RD;
+ xfer[1].len = 1;
+ xfer[1].buf = &hi;
+
+ xfer[2].addr = data->client->addr;
+ xfer[2].flags = 0;
+ xfer[2].len = 1;
+ xfer[2].buf = luxloreg;
+
+ xfer[3].addr = data->client->addr;
+ xfer[3].flags = I2C_M_RD;
+ xfer[3].len = 1;
+ xfer[3].buf = &lo;
+
+ /*
+ * Use i2c_transfer instead of smbus read because i2c_transfer
+ * does NOT use a stop bit between address write and data read.
+ * Using a stop bit causes disjoint upper/lower byte reads and
+ * reduces accuracy
+ */
+ mutex_lock(&data->lock);
+ ret = i2c_transfer(data->client->adapter, xfer, READ_LUX_XFER_LEN);
+ mutex_unlock(&data->lock);
+ if (ret != READ_LUX_XFER_LEN) {
+ return -EIO;
+ }
+
+ reg = (((u16)hi) << 4) | (lo & 0xf);
+
+ return MAX44009_LUX(reg);
+}
+
+static int max44009_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan, int *val,
+ int *val2, long mask)
+{
+ struct max44009_data *data = iio_priv(indio_dev);
+ int ret;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW: {
+ switch (chan->type) {
+ case IIO_LIGHT: {
+ ret = max44009_read_lux_raw(data);
+ if (ret < 0) {
+ return ret;
+ }
+ *val = ret;
+ *val2 = 0;
+ return IIO_VAL_INT;
+ }
+ default:
+ return -EINVAL;
+ }
+ break;
+ }
+
+ case IIO_CHAN_INFO_INT_TIME: {
+ ret = max44009_read_int_time(data);
+ if (ret < 0) {
+ return ret;
+ }
+
+ *val2 = ret;
+ *val = 0;
+ return IIO_VAL_INT_PLUS_NANO;
+ }
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static IIO_CONST_ATTR(illuminance_scale_available, max44009_scale_avail_str);
+static IIO_CONST_ATTR(illuminance_integration_time_available,
+ max44009_int_time_str);
+
+static struct attribute *max44009_attributes[] = {
+ &iio_const_attr_illuminance_integration_time_available.dev_attr.attr,
+ &iio_const_attr_illuminance_scale_available.dev_attr.attr, NULL
+};
+
+static const struct attribute_group max44009_attribute_group = {
+ .attrs = max44009_attributes,
+};
+
+static int max44009_thresh_byte_from_int(int thresh)
+{
+ int mantissa, exp;
+
+ if (thresh < 0 || thresh > MAX44009_MAXIMUM_THRESHOLD) {
+ return -EINVAL;
+ }
+
+ for (mantissa = thresh, exp = 0; mantissa > 0xff; exp++) {
+ mantissa >>= 1;
+ }
+
+ mantissa >>= 4;
+ mantissa &= 0xf;
+ exp <<= 4;
+
+ return exp | mantissa;
+}
+
+static int max44009_get_thr_reg(enum iio_event_direction dir)
+{
+ switch (dir) {
+ case IIO_EV_DIR_RISING:
+ return MAX44009_REG_UPPER_THR;
+ case IIO_EV_DIR_FALLING:
+ return MAX44009_REG_LOWER_THR;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int max44009_write_thresh(struct iio_dev *indio_dev,
+ enum iio_event_direction dir, int val)
+{
+ struct max44009_data *data = iio_priv(indio_dev);
+ int thresh;
+ int reg;
+
+ reg = max44009_get_thr_reg(dir);
+ if (reg < 0) {
+ return reg;
+ }
+
+ thresh = max44009_thresh_byte_from_int(val);
+ if (thresh < 0) {
+ return thresh;
+ }
+
+ return max44009_write_reg(data, reg, thresh);
+}
+
+static int max44009_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)
+{
+ if (info != IIO_EV_INFO_VALUE || chan->type != IIO_LIGHT || val2 != 0) {
+ return -EINVAL;
+ }
+
+ return max44009_write_thresh(indio_dev, dir, val);
+}
+
+static int max44009_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 thresh, reg;
+ struct max44009_data *data = iio_priv(indio_dev);
+
+ if (chan->type != IIO_LIGHT || type != IIO_EV_TYPE_THRESH) {
+ return -EINVAL;
+ }
+
+ reg = max44009_get_thr_reg(dir);
+ if (reg < 0) {
+ return reg;
+ }
+
+ thresh = max44009_read_reg(data, reg);
+ if (thresh < 0) {
+ return thresh;
+ }
+
+ *val = MAX44009_THRESHOLD(thresh);
+
+ return IIO_VAL_INT;
+}
+
+static int max44009_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 max44009_data *data = iio_priv(indio_dev);
+ int ret;
+
+ if (chan->type != IIO_LIGHT || type != IIO_EV_TYPE_THRESH) {
+ return -EINVAL;
+ }
+
+ ret = max44009_write_reg(data, MAX44009_REG_ENABLE, state);
+ if (ret < 0) {
+ return ret;
+ }
+
+ /*
+ * Set device to trigger interrupt immediately upon exceeding
+ * the threshold limit
+ */
+ ret = max44009_write_reg(data, MAX44009_REG_THR_TIMER, 0);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return 0;
+}
+
+static int max44009_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 max44009_data *data = iio_priv(indio_dev);
+ int ret;
+
+ if (chan->type != IIO_LIGHT || type != IIO_EV_TYPE_THRESH) {
+ return -EINVAL;
+ }
+
+ ret = max44009_read_reg(data, MAX44009_REG_ENABLE);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return ret;
+}
+
+static const struct iio_info max44009_info = {
+ .read_raw = max44009_read_raw,
+ .write_raw = max44009_write_raw,
+ .write_raw_get_fmt = max44009_write_raw_get_fmt,
+ .read_event_value = max44009_read_event_value,
+ .read_event_config = max44009_read_event_config,
+ .write_event_value = max44009_write_event_value,
+ .write_event_config = max44009_write_event_config,
+ .attrs = &max44009_attribute_group,
+};
+
+static int max44009_set_trigger_state(struct iio_trigger *trigger,
+ bool enable)
+{
+ struct iio_dev *indio_dev = iio_trigger_get_drvdata(trigger);
+ struct max44009_data *data = iio_priv(indio_dev);
+ int ret;
+
+ ret = max44009_write_reg(data, MAX44009_REG_ENABLE, enable);
+ if (ret < 0) {
+ return ret;
+ }
+
+ ret = max44009_write_reg(data, MAX44009_REG_THR_TIMER, 0);
+ if (ret < 0) {
+ return ret;
+ }
+
+ return ret;
+}
+
+static const struct iio_trigger_ops max44009_trigger_ops = {
+ .set_trigger_state = max44009_set_trigger_state,
+};
+
+static irqreturn_t max44009_trigger_handler(int irq, void *p)
+{
+ struct iio_dev *indio_dev = p;
+ struct max44009_data *data = iio_priv(indio_dev);
+ int lux, upper, lower;
+ int ret;
+ enum iio_event_direction direction;
+
+ /* 32-bit for lux and 64-bit for timestamp */
+ u32 buf[3] = {0};
+
+ ret = max44009_read_reg(data, MAX44009_REG_STATUS);
+ if (ret <= 0) {
+ goto err;
+ }
+
+ ret = max44009_read_reg(data, MAX44009_REG_ENABLE);
+ if (ret <= 0) {
+ goto err;
+ }
+
+ /* Clear interrupt by disabling interrupt (see datasheet) */
+ ret = max44009_write_reg(data, MAX44009_REG_ENABLE, 0);
+ if (ret < 0) {
+ goto err;
+ }
+
+ lux = max44009_read_lux_raw(data);
+ if (lux < 0) {
+ goto err;
+ }
+
+ upper = max44009_read_reg(data, MAX44009_REG_UPPER_THR);
+ if (upper < 0) {
+ goto err;
+ }
+ upper = MAX44009_THRESHOLD(upper);
+
+ lower = max44009_read_reg(data, MAX44009_REG_LOWER_THR);
+ if (lower < 0) {
+ goto err;
+ }
+ lower = MAX44009_THRESHOLD(lower);
+
+ /* If lux is NOT out-of-bounds then the interrupt was not triggered
+ * by this device
+ */
+ if (lux < upper && lux > lower) {
+ goto err;
+ }
+
+ /* Get event for correct thresh direction */
+ if (lux >= upper) {
+ direction = IIO_EV_DIR_RISING;
+ } else if (lux <= lower) {
+ direction = IIO_EV_DIR_FALLING;
+ } else {
+ goto err;
+ }
+
+ buf[0] = lux;
+ iio_push_to_buffers_with_timestamp(indio_dev, &buf, data->timestamp);
+ iio_trigger_notify_done(data->trigger);
+
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0,
+ IIO_EV_TYPE_THRESH, direction),
+ data->timestamp);
+
+ ret = max44009_write_reg(data, MAX44009_REG_ENABLE, 1);
+ if (ret < 0) {
+ goto err;
+ }
+
+ return IRQ_HANDLED;
+
+err:
+ /* Re-enable interrupt */
+ max44009_write_reg(data, MAX44009_REG_ENABLE, 1);
+ return IRQ_NONE;
+}
+
+static irqreturn_t max44009_irq_handler(int irq, void *p)
+{
+ struct iio_dev *indio_dev = p;
+ struct max44009_data *data = iio_priv(indio_dev);
+
+ data->timestamp = iio_get_time_ns(indio_dev);
+ return IRQ_WAKE_THREAD;
+}
+
+static int max44009_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct max44009_data *data;
+ struct iio_dev *indio_dev;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+ if (!indio_dev) {
+ return -ENOMEM;
+ }
+ data = iio_priv(indio_dev);
+ i2c_set_clientdata(client, indio_dev);
+ data->client = client;
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->info = &max44009_info;
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->name = MAX44009_DRV_NAME;
+ indio_dev->channels = max44009_channels;
+ indio_dev->num_channels = ARRAY_SIZE(max44009_channels);
+ mutex_init(&data->lock);
+
+ /* Clear stale interrupt bit */
+ ret = max44009_read_reg(data, MAX44009_REG_STATUS);
+ if (ret < 0) {
+ goto err;
+ }
+
+ if (client->irq > 0) {
+ ret = devm_request_threaded_irq(&client->dev, client->irq,
+ max44009_irq_handler,
+ max44009_trigger_handler,
+ IRQF_TRIGGER_FALLING |
+ IRQF_ONESHOT,
+ MAX44009_IRQ_NAME, indio_dev);
+ if (ret < 0) {
+ goto err;
+ }
+
+ ret = devm_iio_triggered_buffer_setup(&client->dev, indio_dev,
+ max44009_irq_handler,
+ max44009_trigger_handler,
+ NULL);
+ if (ret < 0) {
+ goto err;
+ }
+
+ data->trigger = devm_iio_trigger_alloc(indio_dev->dev.parent,
+ "%s-dev%d",
+ indio_dev->name,
+ indio_dev->id);
+ if (!data->trigger) {
+ ret = -ENOMEM;
+ goto err;
+ }
+ data->trigger->dev.parent = indio_dev->dev.parent;
+ data->trigger->ops = &max44009_trigger_ops;
+ iio_trigger_set_drvdata(data->trigger, indio_dev);
+
+ ret = devm_iio_trigger_register(&client->dev, data->trigger);
+ if (ret < 0) {
+ goto err;
+ }
+ }
+
+ ret = devm_iio_device_register(&client->dev, indio_dev);
+ if (ret < 0) {
+ goto err;
+ }
+
+ return 0;
+err:
+ mutex_destroy(&data->lock);
+ return ret;
+}
+
+static const struct i2c_device_id max44009_id[] = {
+ { "max44009", 0 },
+ { }
+};
+MODULE_DEVICE_TABLE(i2c, max44009_id);
+
+static struct i2c_driver max44009_driver = {
+ .driver = {
+ .name = MAX44009_DRV_NAME,
+ },
+ .probe = max44009_probe,
+ .id_table = max44009_id,
+};
+module_i2c_driver(max44009_driver);
+
+static const struct of_device_id max44009_of_match[] = {
+ { .compatible = "maxim,max44009" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, max44009_of_match);
+
+MODULE_AUTHOR("Robert Eshleman <bobbyeshleman@xxxxxxxxx>");
+MODULE_LICENSE("GPL v2");
+MODULE_VERSION("1.0.0");
+MODULE_DESCRIPTION("MAX44009 ambient light sensor driver");
--
2.20.1