TI's opt3001 light sensor is a simple and yet powerful
little device. The device provides 99% IR rejection,
Automatic full-scale, very low power consumption and
measurements from 0.01 to 83k lux.
This patch adds support for that device using the IIO
framework.
Signed-off-by: Felipe Balbi <balbi@xxxxxx>
---
Jonathan, I have a few doubts on how can I test buffered
mode properly. I can see my IRQs triggering now problem,
but where is the data pushed ? Can it be read from sysfs
or /dev somehwere ?
Also, there are a couple details about this device which
I need to know if it looks for you:
This device has a single enable bit which will enable both
rising and falling edge triggers, but the limits are separate.
The same limits are also used for hysteresis-style capture and
that's controlled by a single bit flip.
How do you want this to look on sysfs ? Currently, enable/disabling
any of rising/falling edges, will disable both.
Cheers
drivers/iio/light/Kconfig | 12 +
drivers/iio/light/Makefile | 1 +
drivers/iio/light/opt3001.c | 765 ++++++++++++++++++++++++++++++++++++++++++++
3 files changed, 778 insertions(+)
create mode 100644 drivers/iio/light/opt3001.c
diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index bf05ca5..e4582d7 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -128,6 +128,18 @@ config LTR501
This driver can also be built as a module. If so, the module
will be called ltr501.
+config OPT3001
+ tristate "Texas Instruments OPT3001 Light Sensor"
+ depends on I2C
+ select IIO_BUFFER
+ select IIO_TRIGGERED_BUFFER
+ help
+ If you say Y or M here, you get support for Texas Instruments
+ OPT3001 Ambient Light Sensor.
+
+ If built as a dynamically linked module, it will be called
+ opt3001.
+
config TCS3414
tristate "TAOS TCS3414 digital color sensor"
depends on I2C
diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
index 8b8c09f..898ef13 100644
--- a/drivers/iio/light/Makefile
+++ b/drivers/iio/light/Makefile
@@ -13,6 +13,7 @@ obj-$(CONFIG_HID_SENSOR_PROX) += hid-sensor-prox.o
obj-$(CONFIG_ISL29125) += isl29125.o
obj-$(CONFIG_SENSORS_LM3533) += lm3533-als.o
obj-$(CONFIG_LTR501) += ltr501.o
+obj-$(CONFIG_OPT3001) += opt3001.o
obj-$(CONFIG_SENSORS_TSL2563) += tsl2563.o
obj-$(CONFIG_TCS3414) += tcs3414.o
obj-$(CONFIG_TCS3472) += tcs3472.o
diff --git a/drivers/iio/light/opt3001.c b/drivers/iio/light/opt3001.c
new file mode 100644
index 0000000..1d925fd1
--- /dev/null
+++ b/drivers/iio/light/opt3001.c
@@ -0,0 +1,765 @@
+/**
+ * opt3001.c - Texas Instruments OPT3001 Light Sensor
+ *
+ * Copyright (C) 2014 Texas Instruments Incorporated - http://www.ti.com
+ *
+ * Author: Felipe Balbi <balbi@xxxxxx>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 of the License
+ * as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+
+#include <linux/bitops.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/i2c.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/slab.h>
+#include <linux/types.h>
+
+#include <linux/iio/events.h>
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+
+#define OPT3001_RESULT 0x00
+#define OPT3001_CONFIGURATION 0x01
+#define OPT3001_LOW_LIMIT 0x02
+#define OPT3001_HIGH_LIMIT 0x03
+#define OPT3001_MANUFACTURER_ID 0x7e
+#define OPT3001_DEVICE_ID 0x7f
+
+#define OPT3001_CONFIGURATION_RN_MASK (0xf << 12)
+#define OPT3001_CONFIGURATION_RN_AUTO (0xc << 12)
+
+#define OPT3001_CONFIGURATION_CT (1 << 11)
+
+#define OPT3001_CONFIGURATION_M_MASK (3 << 9)
+#define OPT3001_CONFIGURATION_M_SHUTDOWN (0 << 9)
+#define OPT3001_CONFIGURATION_M_SINGLE (1 << 9)
+#define OPT3001_CONFIGURATION_M_CONTINUOUS (2 << 9) /* also 3 << 9 */
+
+#define OPT3001_CONFIGURATION_OVF (1 << 8)
+#define OPT3001_CONFIGURATION_CRF (1 << 7)
+#define OPT3001_CONFIGURATION_FH (1 << 6)
+#define OPT3001_CONFIGURATION_FL (1 << 5)
+#define OPT3001_CONFIGURATION_L (1 << 4)
+#define OPT3001_CONFIGURATION_POL (1 << 3)
+#define OPT3001_CONFIGURATION_ME (1 << 2)
+
+#define OPT3001_CONFIGURATION_FC_MASK (3 << 0)
+
+#define OPT3001_REG_EXPONENT(n) ((n) >> 12)
+#define OPT3001_REG_MANTISSA(n) ((n) & 0xfff)
+
+struct opt3001 {
+ struct i2c_client *client;
+ struct device *dev;
+ struct iio_dev *iio;
+
+ struct mutex lock;
+
+ u32 int_time;
+ u32 mode;
+
+ u16 high_thresh_mantissa;
+ u16 low_thresh_mantissa;
+
+ u8 high_thresh_exp;
+ u8 low_thresh_exp;
+
+ unsigned int hysteresis:1;
+};
+
+struct opt3001_scale {
+ int val;
+ int val2;
+};
+
+static const struct opt3001_scale opt3001_scales[] = {
+ {
+ .val = 40,
+ .val2 = 950000,
+ },
+ {
+ .val = 81,
+ .val2 = 900000,
+ },
+ {
+ .val = 81,
+ .val2 = 900000,
+ },
+ {
+ .val = 163,
+ .val2 = 800000,
+ },
+ {
+ .val = 327,
+ .val2 = 600000,
+ },
+ {
+ .val = 655,
+ .val2 = 200000,
+ },
+ {
+ .val = 1310,
+ .val2 = 400000,
+ },
+ {
+ .val = 2620,
+ .val2 = 800000,
+ },
+ {
+ .val = 5241,
+ .val2 = 600000,
+ },
+ {
+ .val = 10483,
+ .val2 = 200000,
+ },
+ {
+ .val = 20966,
+ .val2 = 400000,
+ },
+ {
+ .val = 83865,
+ .val2 = 600000,
+ },
+};
+
+static int opt3001_find_scale(const struct opt3001 *opt, int val,
+ int val2, u8 *exponent)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(opt3001_scales); i++) {
+ const struct opt3001_scale *scale = &opt3001_scales[i];
+
+ if (val <= scale->val && val2 <= scale->val2) {
+ *exponent = i;
+ return 0;
+ }
+ }
+
+ return -EINVAL;
+}
+
+static void opt3001_to_iio_ret(struct opt3001 *opt, u8 exponent,
+ u16 mantissa, int *val, int *val2)
+{
+ int lux;
+
+ lux = 10 * (mantissa << exponent);
+ *val = lux / 1000;
+ *val2 = (lux - (*val * 1000)) * 1000;
+}
+
+static void opt3001_set_mode(struct opt3001 *opt, u16 *reg, u16 mode)
+{
+ *reg &= ~OPT3001_CONFIGURATION_M_MASK;
+ *reg |= mode;
+ opt->mode = mode;
+}
+
+static int opt3001_read(const struct opt3001 *opt, u8 reg)
+{
+ return i2c_smbus_read_word_swapped(opt->client, reg);
+}
+
+static int opt3001_write(const struct opt3001 *opt, u8 reg, u16 value)
+{
+ return i2c_smbus_write_word_swapped(opt->client, reg, value);
+}
+
+static IIO_CONST_ATTR_INT_TIME_AVAIL("0.1 0.8");
+
+static struct attribute *opt3001_attributes[] = {
+ &iio_const_attr_integration_time_available.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group opt3001_attribute_group = {
+ .attrs = opt3001_attributes,
+};
+
+static const struct iio_event_spec opt3001_event_spec[] = {
+ {
+ .type = IIO_EV_TYPE_THRESH,
+ .dir = IIO_EV_DIR_RISING,
+ .mask_separate = BIT(IIO_EV_INFO_VALUE) |
+ BIT(IIO_EV_INFO_HYSTERESIS) |
+ 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_HYSTERESIS) |
+ BIT(IIO_EV_INFO_ENABLE),
+ },
+};
+
+static const struct iio_chan_spec opt3001_channels[] = {
+ {
+ .type = IIO_LIGHT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SCALE) |
+ BIT(IIO_CHAN_INFO_INT_TIME),
+ .channel = 0,
+ .scan_type = {
+ .sign = 'u',
+ .endianness = IIO_BE,
+ },
+ .scan_index = 0,
+ .event_spec = opt3001_event_spec,
+ .num_event_specs = ARRAY_SIZE(opt3001_event_spec),
+ },
+ IIO_CHAN_SOFT_TIMESTAMP(1),
+};
+
+static int opt3001_get_lux(struct opt3001 *opt, int *val, int *val2)
+{
+ int ret;
+ u16 mantissa;
+ u16 reg;
+ u8 exponent;
+
+ ret = opt3001_read(opt, OPT3001_CONFIGURATION);
+ if (ret < 0) {
+ dev_err(opt->dev, "failed to read register %02x\n",
+ OPT3001_CONFIGURATION);
+ return ret;
+ }
+
+ reg = ret;
+ opt3001_set_mode(opt, ®, OPT3001_CONFIGURATION_M_SINGLE);
+
+ ret = opt3001_write(opt, OPT3001_CONFIGURATION, reg);
+ if (ret < 0) {
+ dev_err(opt->dev, "failed to read register %02x\n",
+ OPT3001_CONFIGURATION);
+ return ret;
+ }
+
+ /* wait for conversion and give it an extra 5ms */
+ usleep_range(opt->int_time + 5000, opt->int_time + 10000);
+
+ ret = opt3001_read(opt, OPT3001_CONFIGURATION);
+ if (ret < 0) {
+ dev_err(opt->dev, "failed to read register %02x\n",
+ OPT3001_CONFIGURATION);
+ return ret;
+ }
+
+ reg = ret;
+ if (!(reg & OPT3001_CONFIGURATION_CRF))
+ return -EPIPE;
+
+ ret = opt3001_read(opt, OPT3001_RESULT);
+ if (ret < 0) {
+ dev_err(opt->dev, "failed to read register %02x\n",
+ OPT3001_RESULT);
+ return ret;
+ }
+
+ exponent = OPT3001_REG_EXPONENT(ret);
+ mantissa = OPT3001_REG_MANTISSA(ret);
+
+ opt3001_to_iio_ret(opt, exponent, mantissa, val, val2);
+
+ return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static int opt3001_get_scale(struct opt3001 *opt, int *val, int *val2)
+{
+ int ret;
+ u8 exponent;
+
+ ret = opt3001_read(opt, OPT3001_RESULT);
+ if (ret < 0) {
+ dev_err(opt->dev, "failed to read register %02x\n",
+ OPT3001_RESULT);
+ return ret;
+ }
+
+ exponent = OPT3001_REG_EXPONENT(ret);
+ *val = opt3001_scales[exponent].val;
+ *val2 = opt3001_scales[exponent].val2;
+
+ return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static int opt3001_get_int_time(struct opt3001 *opt, int *val, int *val2)
+{
+ *val = 0;
+ *val2 = opt->int_time;
+
+ return IIO_VAL_INT_PLUS_MICRO;
+}
+
+static int opt3001_set_int_time(struct opt3001 *opt, int time)
+{
+ int ret;
+ u16 reg;
+
+ ret = opt3001_read(opt, OPT3001_CONFIGURATION);
+ if (ret < 0) {
+ dev_err(opt->dev, "failed to read register %02x\n",
+ OPT3001_CONFIGURATION);
+ return ret;
+ }
+
+ reg = ret;
+
+ switch (time) {
+ case 100000:
+ reg &= ~OPT3001_CONFIGURATION_CT;
+ opt->int_time = 100000;
+ break;
+ case 800000:
+ reg |= OPT3001_CONFIGURATION_CT;
+ opt->int_time = 800000;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return opt3001_write(opt, OPT3001_CONFIGURATION, reg);
+}
+
+static int opt3001_read_raw(struct iio_dev *iio,
+ struct iio_chan_spec const *chan, int *val, int *val2,
+ long mask)
+{
+ struct opt3001 *opt = iio_priv(iio);
+ int ret = 0;
+
+ if (opt->mode == OPT3001_CONFIGURATION_M_CONTINUOUS)
+ return -EBUSY;
+
+ if (chan->type != IIO_LIGHT)
+ return -EINVAL;
+
+ mutex_lock(&opt->lock);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ ret = opt3001_get_lux(opt, val, val2);
+ break;
+ case IIO_CHAN_INFO_SCALE:
+ ret = opt3001_get_scale(opt, val, val2);
+ break;
+ case IIO_CHAN_INFO_INT_TIME:
+ ret = opt3001_get_int_time(opt, val, val2);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ mutex_unlock(&opt->lock);
+
+ return ret;
+}
+
+static int opt3001_write_raw(struct iio_dev *iio,
+ struct iio_chan_spec const *chan, int val, int val2,
+ long mask)
+{
+ struct opt3001 *opt = iio_priv(iio);
+ int ret = 0;
+
+ if (opt->mode == OPT3001_CONFIGURATION_M_CONTINUOUS)
+ return -EBUSY;
+
+ if (chan->type != IIO_LIGHT)
+ return -EINVAL;
+
+ mutex_lock(&opt->lock);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_INT_TIME:
+ ret = opt3001_set_int_time(opt, val);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ mutex_unlock(&opt->lock);
+
+ return ret;
+}
+
+static int opt3001_read_event_value(struct iio_dev *iio,
+ 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 opt3001 *opt = iio_priv(iio);
+ int ret = IIO_VAL_INT_PLUS_MICRO;
+
+ mutex_lock(&opt->lock);
+
+ switch (dir) {
+ case IIO_EV_DIR_RISING:
+ opt3001_to_iio_ret(opt, opt->high_thresh_exp,
+ opt->high_thresh_mantissa, val, val2);
+ break;
+ case IIO_EV_DIR_FALLING:
+ opt3001_to_iio_ret(opt, opt->low_thresh_exp,
+ opt->low_thresh_mantissa, val, val2);
+ break;
+ default:
+ ret = -EINVAL;
+ }
+
+ mutex_unlock(&opt->lock);
+
+ return ret;
+}
+
+static int opt3001_write_event_value(struct iio_dev *iio,
+ 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 opt3001 *opt = iio_priv(iio);
+ int ret = 0;
+
+ u16 *thresh_mantissa;
+ u16 mantissa;
+ u16 value;
+ u16 reg;
+
+ u8 *thresh_exp;
+
+ u8 exponent;
+
+ mutex_lock(&opt->lock);
+
+ ret = opt3001_read(opt, OPT3001_CONFIGURATION);
+ if (ret < 0) {
+ dev_err(opt->dev, "failed to read register %02x\n",
+ OPT3001_CONFIGURATION);
+ goto err;
+ }
+
+ reg = ret;
+ if (info == IIO_EV_INFO_HYSTERESIS)
+ opt->hysteresis = true;
+ else
+ opt->hysteresis = false;
+
+ switch (dir) {
+ case IIO_EV_DIR_RISING:
+ reg = OPT3001_HIGH_LIMIT;
+ thresh_mantissa = &opt->high_thresh_mantissa;
+ thresh_exp = &opt->high_thresh_exp;
+ break;
+ case IIO_EV_DIR_FALLING:
+ reg = OPT3001_LOW_LIMIT;
+ thresh_mantissa = &opt->low_thresh_mantissa;
+ thresh_exp = &opt->low_thresh_exp;
+ break;
+ default:
+ ret = -EINVAL;
+ goto err;
+ }
+
+ ret = opt3001_find_scale(opt, val, val2, &exponent);
+ if (ret < 0) {
+ dev_err(opt->dev, "can't find scale for %d.%d\n", val, val2);
+ goto err;
+ }
+
+ mantissa = (((val * 1000) + (val2 / 1000)) / 10) >> exponent;
+ value = exponent << 12 | mantissa;
+ ret = opt3001_write(opt, reg, value);
+ if (ret < 0) {
+ dev_err(opt->dev, "failed to read register %02x\n", reg);
+ goto err;
+ }
+
+ *thresh_mantissa = mantissa;
+ *thresh_exp = exponent;
+
+err:
+ mutex_unlock(&opt->lock);
+
+ return ret;
+}
+
+static int opt3001_read_event_config(struct iio_dev *iio,
+ const struct iio_chan_spec *chan, enum iio_event_type type,
+ enum iio_event_direction dir)
+{
+ struct opt3001 *opt = iio_priv(iio);
+
+ return opt->mode == OPT3001_CONFIGURATION_M_CONTINUOUS;
+}
+
+static int opt3001_write_event_config(struct iio_dev *iio,
+ const struct iio_chan_spec *chan, enum iio_event_type type,
+ enum iio_event_direction dir, int state)
+{
+ struct opt3001 *opt = iio_priv(iio);
+ int ret;
+ u16 mode;
+ u16 reg;
+
+ if (state && opt->mode == OPT3001_CONFIGURATION_M_CONTINUOUS)
+ return 0;
+
+ if (!state && opt->mode == OPT3001_CONFIGURATION_M_SHUTDOWN)
+ return 0;
+
+ mode = state ? OPT3001_CONFIGURATION_M_CONTINUOUS
+ : OPT3001_CONFIGURATION_M_SHUTDOWN;
+
+ ret = opt3001_read(opt, OPT3001_CONFIGURATION);
+ if (ret < 0) {
+ dev_err(opt->dev, "failed to read register %02x\n",
+ OPT3001_CONFIGURATION);
+ return ret;
+ }
+
+ reg = ret;
+ opt3001_set_mode(opt, ®, mode);
+
+ if (opt->hysteresis)
+ reg |= OPT3001_CONFIGURATION_L;
+ else
+ reg &= ~OPT3001_CONFIGURATION_L;
+
+ ret = opt3001_write(opt, OPT3001_CONFIGURATION, reg);
+ if (ret < 0) {
+ dev_err(opt->dev, "failed to read register %02x\n",
+ OPT3001_CONFIGURATION);
+ return ret;
+ }
+
+ /* wait for mode change to go through */
+ usleep_range(opt->int_time + 5000, opt->int_time + 10000);
+
+ return 0;
+}
+
+static const struct iio_info opt3001_info = {
+ .driver_module = THIS_MODULE,
+ .attrs = &opt3001_attribute_group,
+ .read_raw = opt3001_read_raw,
+ .write_raw = opt3001_write_raw,
+ .read_event_value = opt3001_read_event_value,
+ .write_event_value = opt3001_write_event_value,
+ .read_event_config = opt3001_read_event_config,
+ .write_event_config = opt3001_write_event_config,
+};
+
+static int opt3001_read_id(struct opt3001 *opt)
+{
+ char manufacturer[2];
+ u16 device_id;
+ int ret;
+
+ ret = opt3001_read(opt, OPT3001_MANUFACTURER_ID);
+ if (ret < 0) {
+ dev_err(opt->dev, "failed to read register %02x\n",
+ OPT3001_MANUFACTURER_ID);
+ return ret;
+ }
+
+ manufacturer[0] = ret >> 8;
+ manufacturer[1] = ret & 0xff;
+
+ ret = opt3001_read(opt, OPT3001_DEVICE_ID);
+ if (ret < 0) {
+ dev_err(opt->dev, "failed to read register %02x\n",
+ OPT3001_DEVICE_ID);
+ return ret;
+ }
+
+ device_id = ret;
+
+ dev_info(opt->dev, "Found %c%c OPT%04x\n", manufacturer[0],
+ manufacturer[1], device_id);
+
+ return 0;
+}
+
+static int opt3001_configure(struct opt3001 *opt)
+{
+ int ret;
+ u16 reg;
+
+ ret = opt3001_read(opt, OPT3001_CONFIGURATION);
+ if (ret < 0) {
+ dev_err(opt->dev, "failed to read register %02x\n",
+ OPT3001_CONFIGURATION);
+ return ret;
+ }
+
+ reg = ret;
+
+ if (reg & OPT3001_CONFIGURATION_CT)
+ opt->int_time = 800000;
+ else
+ opt->int_time = 100000;
+
+ reg &= ~OPT3001_CONFIGURATION_L;
+ reg &= ~OPT3001_CONFIGURATION_RN_MASK;
+ reg |= OPT3001_CONFIGURATION_RN_AUTO;
+
+ ret = opt3001_write(opt, OPT3001_CONFIGURATION, reg);
+ if (ret < 0) {
+ dev_err(opt->dev, "failed to write register %02x\n",
+ OPT3001_CONFIGURATION);
+ return ret;
+ }
+
+ ret = opt3001_read(opt, OPT3001_LOW_LIMIT);
+ if (ret < 0) {
+ dev_err(opt->dev, "failed to read register %02x\n",
+ OPT3001_LOW_LIMIT);
+ return ret;
+ }
+
+ opt->low_thresh_mantissa = OPT3001_REG_MANTISSA(ret);
+ opt->low_thresh_exp = OPT3001_REG_EXPONENT(ret);
+
+ ret = opt3001_read(opt, OPT3001_HIGH_LIMIT);
+ if (ret < 0) {
+ dev_err(opt->dev, "failed to read register %02x\n",
+ OPT3001_HIGH_LIMIT);
+ return ret;
+ }
+
+ opt->high_thresh_mantissa = OPT3001_REG_MANTISSA(ret);
+ opt->high_thresh_exp = OPT3001_REG_EXPONENT(ret);
+
+ return 0;
+}
+
+static irqreturn_t opt3001_irq(int irq, void *_opt)
+{
+ struct opt3001 *opt = _opt;
+ int ret;
+
+ mutex_lock(&opt->lock);
+
+ ret = opt3001_read(opt, OPT3001_CONFIGURATION);
+ if (ret < 0) {
+ dev_err(opt->dev, "failed to read register %02x\n",
+ OPT3001_CONFIGURATION);
+ goto out;
+ }
+
+ if (!(ret & OPT3001_CONFIGURATION_CT))
+ goto out;
+
+ if (ret & OPT3001_CONFIGURATION_FH)
+ iio_push_event(opt->iio, IIO_UNMOD_EVENT_CODE(IIO_LIGHT,
+ 0, IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_RISING), iio_get_time_ns());
+
+ if (ret & OPT3001_CONFIGURATION_FL)
+ iio_push_event(opt->iio, IIO_UNMOD_EVENT_CODE(IIO_LIGHT,
+ 0, IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_FALLING), iio_get_time_ns());
+
+out:
+ mutex_unlock(&opt->lock);
+ return IRQ_HANDLED;
+}
+
+static int opt3001_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct device *dev = &client->dev;
+
+ struct iio_dev *iio;
+ struct opt3001 *opt;
+ int irq = client->irq;
+ int ret;
+
+ iio = devm_iio_device_alloc(dev, sizeof(*opt));
+ if (!iio)
+ return -ENOMEM;
+
+ opt = iio_priv(iio);
+ opt->client = client;
+ opt->dev = dev;
+ opt->iio = iio;
+
+ mutex_init(&opt->lock);
+ i2c_set_clientdata(client, opt);
+
+ ret = opt3001_read_id(opt);
+ if (ret)
+ return ret;
+
+ ret = opt3001_configure(opt);
+ if (ret)
+ return ret;
+
+ iio->name = client->name;
+ iio->channels = opt3001_channels;
+ iio->num_channels = ARRAY_SIZE(opt3001_channels);
+ iio->dev.parent = dev;
+ iio->modes = INDIO_DIRECT_MODE;
+ iio->info = &opt3001_info;
+
+ ret = devm_iio_device_register(dev, iio);
+ if (ret) {
+ dev_err(dev, "failed to register IIO device\n");
+ return ret;
+ }
+
+ ret = devm_request_threaded_irq(dev, irq, NULL, opt3001_irq,
+ IRQF_TRIGGER_RISING | IRQF_TRIGGER_FALLING
+ | IRQF_ONESHOT, "opt3001", opt);
+ if (ret) {
+ dev_err(dev, "failed to request IRQ #%d\n", irq);
+ return ret;
+ }
+
+ return 0;
+
+}
+
+static int opt3001_remove(struct i2c_client *client)
+{
+ /* nothing to do here */
+
+ return 0;
+}
+
+static const struct i2c_device_id opt3001_id[] = {
+ { "opt3001", 0 },
+ { } /* Terminating Entry */
+};
+MODULE_DEVICE_TABLE(i2c, opt3001_id);
+
+static struct i2c_driver opt3001_driver = {
+ .probe = opt3001_probe,
+ .remove = opt3001_remove,
+ .id_table = opt3001_id,
+
+ .driver = {
+ .name = "opt3001",
+ .owner = THIS_MODULE,
+ },
+};
+
+module_i2c_driver(opt3001_driver);
+
+MODULE_LICENSE("GPL v2");
+MODULE_AUTHOR("Felipe Balbi <balbi@xxxxxx>");
+MODULE_DESCRIPTION("Texas Instruments OPT3001 Light Sensor Driver");
--
2.0.1.563.g66f467c
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