[PATCH v3 2/2] iio: light: Add support for ADUX1020 sensor

From: Manivannan Sadhasivam
Date: Fri Oct 11 2019 - 14:49:22 EST

Add initial support for Analog Devices ADUX1020 Photometric sensor.
Only proximity mode has been enabled for now.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
---
drivers/iio/light/Kconfig | 11 +
drivers/iio/light/Makefile | 1 +
drivers/iio/light/adux1020.c | 849 +++++++++++++++++++++++++++++++++++
3 files changed, 861 insertions(+)
create mode 100644 drivers/iio/light/adux1020.c

diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig
index 08d7e1ef2186..3f8c8689cd89 100644
--- a/drivers/iio/light/Kconfig
+++ b/drivers/iio/light/Kconfig
@@ -32,6 +32,17 @@ config ADJD_S311
This driver can also be built as a module. If so, the module
will be called adjd_s311.

+config ADUX1020
+ tristate "ADUX1020 photometric sensor"
+ select REGMAP_I2C
+ depends on I2C
+ help
+ Say Y here if you want to build a driver for the Analog Devices
+ ADUX1020 photometric sensor.
+
+ To compile this driver as a module, choose M here: the
+ module will be called adux1020.
+
config AL3320A
tristate "AL3320A ambient light sensor"
depends on I2C
diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile
index 00d1f9b98f39..5d650ce46a40 100644
--- a/drivers/iio/light/Makefile
+++ b/drivers/iio/light/Makefile
@@ -6,6 +6,7 @@
# When adding new entries keep the list in alphabetical order
obj-$(CONFIG_ACPI_ALS) += acpi-als.o
obj-$(CONFIG_ADJD_S311) += adjd_s311.o
+obj-$(CONFIG_ADUX1020) += adux1020.o
obj-$(CONFIG_AL3320A) += al3320a.o
obj-$(CONFIG_APDS9300) += apds9300.o
obj-$(CONFIG_APDS9960) += apds9960.o
diff --git a/drivers/iio/light/adux1020.c b/drivers/iio/light/adux1020.c
new file mode 100644
index 000000000000..830e5e95d58f
--- /dev/null
+++ b/drivers/iio/light/adux1020.c
@@ -0,0 +1,849 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * adux1020.c - Support for Analog Devices ADUX1020 photometric sensor
+ *
+ * Copyright (C) 2019 Linaro Ltd.
+ * Author: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
+ *
+ * TODO: Triggered buffer support
+ */
+
+#include <linux/bitfield.h>
+#include <linux/delay.h>
+#include <linux/err.h>
+#include <linux/i2c.h>
+#include <linux/init.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/module.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+
+#include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
+#include <linux/iio/events.h>
+
+#define ADUX1020_REGMAP_NAME "adux1020_regmap"
+#define ADUX1020_DRV_NAME "adux1020"
+
+/* System registers */
+#define ADUX1020_REG_CHIP_ID 0x08
+#define ADUX1020_REG_SLAVE_ADDRESS 0x09
+
+#define ADUX1020_REG_SW_RESET 0x0f
+#define ADUX1020_REG_INT_ENABLE 0x1c
+#define ADUX1020_REG_INT_POLARITY 0x1d
+#define ADUX1020_REG_PROX_TH_ON1 0x2a
+#define ADUX1020_REG_PROX_TH_OFF1 0x2b
+#define ADUX1020_REG_PROX_TYPE 0x2f
+#define ADUX1020_REG_TEST_MODES_3 0x32
+#define ADUX1020_REG_FORCE_MODE 0x33
+#define ADUX1020_REG_FREQUENCY 0x40
+#define ADUX1020_REG_LED_CURRENT 0x41
+#define ADUX1020_REG_OP_MODE 0x45
+#define ADUX1020_REG_INT_MASK 0x48
+#define ADUX1020_REG_INT_STATUS 0x49
+#define ADUX1020_REG_DATA_BUFFER 0x60
+
+/* Chip ID bits */
+#define ADUX1020_CHIP_ID_MASK GENMASK(11, 0)
+#define ADUX1020_CHIP_ID 0x03fc
+
+#define ADUX1020_SW_RESET BIT(1)
+#define ADUX1020_FIFO_FLUSH BIT(15)
+#define ADUX1020_OP_MODE_MASK GENMASK(3, 0)
+#define ADUX1020_DATA_OUT_MODE_MASK GENMASK(7, 4)
+#define ADUX1020_DATA_OUT_PROX_I FIELD_PREP(ADUX1020_DATA_OUT_MODE_MASK, 1)
+
+#define ADUX1020_MODE_INT_MASK GENMASK(7, 0)
+#define ADUX1020_INT_ENABLE 0x2094
+#define ADUX1020_INT_DISABLE 0x2090
+#define ADUX1020_PROX_INT_ENABLE 0x00f0
+#define ADUX1020_PROX_ON1_INT BIT(0)
+#define ADUX1020_PROX_OFF1_INT BIT(1)
+#define ADUX1020_FIFO_INT_ENABLE 0x7f
+#define ADUX1020_MODE_INT_DISABLE 0xff
+#define ADUX1020_MODE_INT_STATUS_MASK GENMASK(7, 0)
+#define ADUX1020_FIFO_STATUS_MASK GENMASK(15, 8)
+#define ADUX1020_INT_CLEAR 0xff
+#define ADUX1020_PROX_TYPE BIT(15)
+
+#define ADUX1020_INT_PROX_ON1 BIT(0)
+#define ADUX1020_INT_PROX_OFF1 BIT(1)
+
+#define ADUX1020_FORCE_CLOCK_ON 0x0f4f
+#define ADUX1020_FORCE_CLOCK_RESET 0x0040
+#define ADUX1020_ACTIVE_4_STATE 0x0008
+
+#define ADUX1020_PROX_FREQ_MASK GENMASK(7, 4)
+#define ADUX1020_PROX_FREQ(x) FIELD_PREP(ADUX1020_PROX_FREQ_MASK, x)
+
+#define ADUX1020_LED_CURRENT_MASK GENMASK(3, 0)
+#define ADUX1020_LED_PIREF_EN BIT(12)
+
+/* Operating modes */
+enum adux1020_op_modes {
+ ADUX1020_MODE_STANDBY,
+ ADUX1020_MODE_PROX_I,
+ ADUX1020_MODE_PROX_XY,
+ ADUX1020_MODE_GEST,
+ ADUX1020_MODE_SAMPLE,
+ ADUX1020_MODE_FORCE = 0x0e,
+ ADUX1020_MODE_IDLE = 0x0f,
+};
+
+struct adux1020_data {
+ struct i2c_client *client;
+ struct iio_dev *indio_dev;
+ struct mutex lock;
+ struct regmap *regmap;
+};
+
+struct adux1020_mode_data {
+ u8 bytes;
+ u8 buf_len;
+ u16 int_en;
+};
+
+static const struct adux1020_mode_data adux1020_modes[] = {
+ [ADUX1020_MODE_PROX_I] = {
+ .bytes = 2,
+ .buf_len = 1,
+ .int_en = ADUX1020_PROX_INT_ENABLE,
+ },
+};
+
+static const struct regmap_config adux1020_regmap_config = {
+ .name = ADUX1020_REGMAP_NAME,
+ .reg_bits = 8,
+ .val_bits = 16,
+ .max_register = 0x6F,
+ .cache_type = REGCACHE_NONE,
+};
+
+static const struct reg_sequence adux1020_def_conf[] = {
+ { 0x000c, 0x000f },
+ { 0x0010, 0x1010 },
+ { 0x0011, 0x004c },
+ { 0x0012, 0x5f0c },
+ { 0x0013, 0xada5 },
+ { 0x0014, 0x0080 },
+ { 0x0015, 0x0000 },
+ { 0x0016, 0x0600 },
+ { 0x0017, 0x0000 },
+ { 0x0018, 0x2693 },
+ { 0x0019, 0x0004 },
+ { 0x001a, 0x4280 },
+ { 0x001b, 0x0060 },
+ { 0x001c, 0x2094 },
+ { 0x001d, 0x0020 },
+ { 0x001e, 0x0001 },
+ { 0x001f, 0x0100 },
+ { 0x0020, 0x0320 },
+ { 0x0021, 0x0A13 },
+ { 0x0022, 0x0320 },
+ { 0x0023, 0x0113 },
+ { 0x0024, 0x0000 },
+ { 0x0025, 0x2412 },
+ { 0x0026, 0x2412 },
+ { 0x0027, 0x0022 },
+ { 0x0028, 0x0000 },
+ { 0x0029, 0x0300 },
+ { 0x002a, 0x0700 },
+ { 0x002b, 0x0600 },
+ { 0x002c, 0x6000 },
+ { 0x002d, 0x4000 },
+ { 0x002e, 0x0000 },
+ { 0x002f, 0x0000 },
+ { 0x0030, 0x0000 },
+ { 0x0031, 0x0000 },
+ { 0x0032, 0x0040 },
+ { 0x0033, 0x0008 },
+ { 0x0034, 0xE400 },
+ { 0x0038, 0x8080 },
+ { 0x0039, 0x8080 },
+ { 0x003a, 0x2000 },
+ { 0x003b, 0x1f00 },
+ { 0x003c, 0x2000 },
+ { 0x003d, 0x2000 },
+ { 0x003e, 0x0000 },
+ { 0x0040, 0x8069 },
+ { 0x0041, 0x1f2f },
+ { 0x0042, 0x4000 },
+ { 0x0043, 0x0000 },
+ { 0x0044, 0x0008 },
+ { 0x0046, 0x0000 },
+ { 0x0048, 0x00ef },
+ { 0x0049, 0x0000 },
+ { 0x0045, 0x0000 },
+};
+
+static const int adux1020_rates[][2] = {
+ { 0, 100000 },
+ { 0, 200000 },
+ { 0, 500000 },
+ { 1, 0 },
+ { 2, 0 },
+ { 5, 0 },
+ { 10, 0 },
+ { 20, 0 },
+ { 50, 0 },
+ { 100, 0 },
+ { 190, 0 },
+ { 450, 0 },
+ { 820, 0 },
+ { 1400, 0 },
+};
+
+static const int adux1020_led_currents[][2] = {
+ { 0, 25000 },
+ { 0, 40000 },
+ { 0, 55000 },
+ { 0, 70000 },
+ { 0, 85000 },
+ { 0, 100000 },
+ { 0, 115000 },
+ { 0, 130000 },
+ { 0, 145000 },
+ { 0, 160000 },
+ { 0, 175000 },
+ { 0, 190000 },
+ { 0, 205000 },
+ { 0, 220000 },
+ { 0, 235000 },
+ { 0, 250000 },
+};
+
+static int adux1020_flush_fifo(struct adux1020_data *data)
+{
+ int ret;
+
+ /* Force Idle mode */
+ ret = regmap_write(data->regmap, ADUX1020_REG_FORCE_MODE,
+ ADUX1020_ACTIVE_4_STATE);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE,
+ ADUX1020_OP_MODE_MASK, ADUX1020_MODE_FORCE);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE,
+ ADUX1020_OP_MODE_MASK, ADUX1020_MODE_IDLE);
+ if (ret < 0)
+ return ret;
+
+ /* Flush FIFO */
+ ret = regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3,
+ ADUX1020_FORCE_CLOCK_ON);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_write(data->regmap, ADUX1020_REG_INT_STATUS,
+ ADUX1020_FIFO_FLUSH);
+ if (ret < 0)
+ return ret;
+
+ return regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3,
+ ADUX1020_FORCE_CLOCK_RESET);
+}
+
+static int adux1020_read_fifo(struct adux1020_data *data, u16 *buf, u8 buf_len)
+{
+ unsigned int regval;
+ int i, ret;
+
+ /* Enable 32MHz clock */
+ ret = regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3,
+ ADUX1020_FORCE_CLOCK_ON);
+ if (ret < 0)
+ return ret;
+
+ for (i = 0; i < buf_len; i++) {
+ ret = regmap_read(data->regmap, ADUX1020_REG_DATA_BUFFER,
+ &regval);
+ if (ret < 0)
+ return ret;
+
+ buf[i] = regval;
+ }
+
+ /* Set 32MHz clock to be controlled by internal state machine */
+ return regmap_write(data->regmap, ADUX1020_REG_TEST_MODES_3,
+ ADUX1020_FORCE_CLOCK_RESET);
+}
+
+static int adux1020_set_mode(struct adux1020_data *data,
+ enum adux1020_op_modes mode)
+{
+ int ret;
+
+ /* Switch to standby mode before changing the mode */
+ ret = regmap_write(data->regmap, ADUX1020_REG_OP_MODE,
+ ADUX1020_MODE_STANDBY);
+ if (ret < 0)
+ return ret;
+
+ /* Set data out and switch to the desired mode */
+ switch (mode) {
+ case ADUX1020_MODE_PROX_I:
+ ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE,
+ ADUX1020_DATA_OUT_MODE_MASK,
+ ADUX1020_DATA_OUT_PROX_I);
+ if (ret < 0)
+ return ret;
+
+ ret = regmap_update_bits(data->regmap, ADUX1020_REG_OP_MODE,
+ ADUX1020_OP_MODE_MASK,
+ ADUX1020_MODE_PROX_I);
+ if (ret < 0)
+ return ret;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+static int adux1020_measure(struct adux1020_data *data,
+ enum adux1020_op_modes mode,
+ u16 *val)
+{
+ unsigned int status;
+ int ret, tries = 50;
+
+ /* Disable INT pin as polling is going to be used */
+ ret = regmap_write(data->regmap, ADUX1020_REG_INT_ENABLE,
+ ADUX1020_INT_DISABLE);
+ if (ret < 0)
+ return ret;
+
+ /* Enable mode interrupt */
+ ret = regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK,
+ ADUX1020_MODE_INT_MASK,
+ adux1020_modes[mode].int_en);
+ if (ret < 0)
+ return ret;
+
+ while (tries--) {
+ ret = regmap_read(data->regmap, ADUX1020_REG_INT_STATUS,
+ &status);
+ if (ret < 0)
+ return ret;
+
+ status &= ADUX1020_FIFO_STATUS_MASK;
+ if (status >= adux1020_modes[mode].bytes)
+ break;
+ msleep(20);
+ }
+
+ if (tries < 0)
+ return -EIO;
+
+ ret = adux1020_read_fifo(data, val, adux1020_modes[mode].buf_len);
+ if (ret < 0)
+ return ret;
+
+ /* Clear mode interrupt */
+ ret = regmap_write(data->regmap, ADUX1020_REG_INT_STATUS,
+ (~adux1020_modes[mode].int_en));
+ if (ret < 0)
+ return ret;
+
+ /* Disable mode interrupts */
+ return regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK,
+ ADUX1020_MODE_INT_MASK,
+ ADUX1020_MODE_INT_DISABLE);
+}
+
+static int adux1020_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct adux1020_data *data = iio_priv(indio_dev);
+ u16 buf[3];
+ int ret = -EINVAL;
+ unsigned int regval;
+
+ mutex_lock(&data->lock);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ ret = adux1020_set_mode(data, ADUX1020_MODE_PROX_I);
+ if (ret < 0)
+ goto fail;
+
+ ret = adux1020_measure(data, ADUX1020_MODE_PROX_I, buf);
+ if (ret < 0)
+ goto fail;
+
+ *val = buf[0];
+ ret = IIO_VAL_INT;
+ break;
+ default:
+ break;
+ }
+ break;
+ case IIO_CHAN_INFO_PROCESSED:
+ switch (chan->type) {
+ case IIO_CURRENT:
+ ret = regmap_read(data->regmap,
+ ADUX1020_REG_LED_CURRENT, &regval);
+ if (ret < 0)
+ goto fail;
+
+ regval = regval & ADUX1020_LED_CURRENT_MASK;
+
+ *val = adux1020_led_currents[regval][0];
+ *val2 = adux1020_led_currents[regval][1];
+
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
+ default:
+ break;
+ }
+ break;
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ ret = regmap_read(data->regmap, ADUX1020_REG_FREQUENCY,
+ &regval);
+ if (ret < 0)
+ goto fail;
+
+ regval = FIELD_GET(ADUX1020_PROX_FREQ_MASK, regval);
+
+ *val = adux1020_rates[regval][0];
+ *val2 = adux1020_rates[regval][1];
+
+ ret = IIO_VAL_INT_PLUS_MICRO;
+ break;
+ default:
+ break;
+ }
+ break;
+ default:
+ break;
+ }
+
+fail:
+ mutex_unlock(&data->lock);
+
+ return ret;
+};
+
+static inline int adux1020_find_index(const int array[][2], int count, int val,
+ int val2)
+{
+ int i;
+
+ for (i = 0; i < count; i++)
+ if (val == array[i][0] && val2 == array[i][1])
+ return i;
+
+ return -EINVAL;
+}
+
+static int adux1020_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct adux1020_data *data = iio_priv(indio_dev);
+ int i, ret = -EINVAL;
+
+ mutex_lock(&data->lock);
+
+ switch (mask) {
+ case IIO_CHAN_INFO_SAMP_FREQ:
+ if (chan->type == IIO_PROXIMITY) {
+ i = adux1020_find_index(adux1020_rates,
+ ARRAY_SIZE(adux1020_rates),
+ val, val2);
+ if (i < 0) {
+ ret = i;
+ goto fail;
+ }
+
+ ret = regmap_update_bits(data->regmap,
+ ADUX1020_REG_FREQUENCY,
+ ADUX1020_PROX_FREQ_MASK,
+ ADUX1020_PROX_FREQ(i));
+ }
+ break;
+ case IIO_CHAN_INFO_PROCESSED:
+ if (chan->type == IIO_CURRENT) {
+ i = adux1020_find_index(adux1020_led_currents,
+ ARRAY_SIZE(adux1020_led_currents),
+ val, val2);
+ if (i < 0) {
+ ret = i;
+ goto fail;
+ }
+
+ ret = regmap_update_bits(data->regmap,
+ ADUX1020_REG_LED_CURRENT,
+ ADUX1020_LED_CURRENT_MASK, i);
+ }
+ break;
+ default:
+ break;
+ }
+
+fail:
+ mutex_unlock(&data->lock);
+
+ return ret;
+}
+
+static int adux1020_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 adux1020_data *data = iio_priv(indio_dev);
+ int ret, mask;
+
+ mutex_lock(&data->lock);
+
+ ret = regmap_write(data->regmap, ADUX1020_REG_INT_ENABLE,
+ ADUX1020_INT_ENABLE);
+ if (ret < 0)
+ goto fail;
+
+ ret = regmap_write(data->regmap, ADUX1020_REG_INT_POLARITY, 0);
+ if (ret < 0)
+ goto fail;
+
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ if (dir == IIO_EV_DIR_RISING)
+ mask = ADUX1020_PROX_ON1_INT;
+ else
+ mask = ADUX1020_PROX_OFF1_INT;
+
+ if (state)
+ state = 0;
+ else
+ state = mask;
+
+ ret = regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK,
+ mask, state);
+ if (ret < 0)
+ goto fail;
+
+ /*
+ * Trigger proximity interrupt when the intensity is above
+ * or below threshold
+ */
+ ret = regmap_update_bits(data->regmap, ADUX1020_REG_PROX_TYPE,
+ ADUX1020_PROX_TYPE,
+ ADUX1020_PROX_TYPE);
+ if (ret < 0)
+ goto fail;
+
+ /* Set proximity mode */
+ ret = adux1020_set_mode(data, ADUX1020_MODE_PROX_I);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+
+fail:
+ mutex_unlock(&data->lock);
+
+ return ret;
+}
+
+static int adux1020_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 adux1020_data *data = iio_priv(indio_dev);
+ int ret, mask;
+ unsigned int regval;
+
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ if (dir == IIO_EV_DIR_RISING)
+ mask = ADUX1020_PROX_ON1_INT;
+ else
+ mask = ADUX1020_PROX_OFF1_INT;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = regmap_read(data->regmap, ADUX1020_REG_INT_MASK, &regval);
+ if (ret < 0)
+ return ret;
+
+ return !(regval & mask);
+}
+
+static int adux1020_read_thresh(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 adux1020_data *data = iio_priv(indio_dev);
+ u8 reg;
+ int ret;
+ unsigned int regval;
+
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ if (dir == IIO_EV_DIR_RISING)
+ reg = ADUX1020_REG_PROX_TH_ON1;
+ else
+ reg = ADUX1020_REG_PROX_TH_OFF1;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ ret = regmap_read(data->regmap, reg, &regval);
+ if (ret < 0)
+ return ret;
+
+ *val = regval;
+
+ return IIO_VAL_INT;
+}
+
+static int adux1020_write_thresh(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 adux1020_data *data = iio_priv(indio_dev);
+ u8 reg;
+
+ switch (chan->type) {
+ case IIO_PROXIMITY:
+ if (dir == IIO_EV_DIR_RISING)
+ reg = ADUX1020_REG_PROX_TH_ON1;
+ else
+ reg = ADUX1020_REG_PROX_TH_OFF1;
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ /* Full scale threshold value is 0-65535 */
+ if (val < 0 || val > 65535)
+ return -EINVAL;
+
+ return regmap_write(data->regmap, reg, val);
+}
+
+static const struct iio_event_spec adux1020_proximity_event[] = {
+ {
+ .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 adux1020_channels[] = {
+ {
+ .type = IIO_PROXIMITY,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
+ BIT(IIO_CHAN_INFO_SAMP_FREQ),
+ .event_spec = adux1020_proximity_event,
+ .num_event_specs = ARRAY_SIZE(adux1020_proximity_event),
+ },
+ {
+ .type = IIO_CURRENT,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
+ .extend_name = "led",
+ .output = 1,
+ },
+};
+
+static IIO_CONST_ATTR_SAMP_FREQ_AVAIL(
+ "0.1 0.2 0.5 1 2 5 10 20 50 100 190 450 820 1400");
+
+static struct attribute *adux1020_attributes[] = {
+ &iio_const_attr_sampling_frequency_available.dev_attr.attr,
+ NULL
+};
+
+static const struct attribute_group adux1020_attribute_group = {
+ .attrs = adux1020_attributes,
+};
+
+static const struct iio_info adux1020_info = {
+ .attrs = &adux1020_attribute_group,
+ .read_raw = adux1020_read_raw,
+ .write_raw = adux1020_write_raw,
+ .read_event_config = adux1020_read_event_config,
+ .write_event_config = adux1020_write_event_config,
+ .read_event_value = adux1020_read_thresh,
+ .write_event_value = adux1020_write_thresh,
+};
+
+static irqreturn_t adux1020_interrupt_handler(int irq, void *private)
+{
+ struct iio_dev *indio_dev = private;
+ struct adux1020_data *data = iio_priv(indio_dev);
+ int ret, status;
+
+ ret = regmap_read(data->regmap, ADUX1020_REG_INT_STATUS, &status);
+ if (ret < 0)
+ return IRQ_HANDLED;
+
+ status &= ADUX1020_MODE_INT_STATUS_MASK;
+
+ if (status & ADUX1020_INT_PROX_ON1) {
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_RISING),
+ iio_get_time_ns(indio_dev));
+ }
+
+ if (status & ADUX1020_INT_PROX_OFF1) {
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
+ IIO_EV_TYPE_THRESH,
+ IIO_EV_DIR_FALLING),
+ iio_get_time_ns(indio_dev));
+ }
+
+ regmap_update_bits(data->regmap, ADUX1020_REG_INT_STATUS,
+ ADUX1020_MODE_INT_MASK, ADUX1020_INT_CLEAR);
+
+ return IRQ_HANDLED;
+}
+
+static int adux1020_chip_init(struct adux1020_data *data)
+{
+ struct i2c_client *client = data->client;
+ int ret;
+ unsigned int val;
+
+ ret = regmap_read(data->regmap, ADUX1020_REG_CHIP_ID, &val);
+ if (ret < 0)
+ return ret;
+
+ if ((val & ADUX1020_CHIP_ID_MASK) != ADUX1020_CHIP_ID) {
+ dev_err(&client->dev, "invalid chip id 0x%04x\n", val);
+ return -ENODEV;
+ };
+
+ dev_dbg(&client->dev, "Detected ADUX1020 with chip id: 0x%04x\n", val);
+
+ ret = regmap_update_bits(data->regmap, ADUX1020_REG_SW_RESET,
+ ADUX1020_SW_RESET, ADUX1020_SW_RESET);
+ if (ret < 0)
+ return ret;
+
+ /* Load default configuration */
+ ret = regmap_multi_reg_write(data->regmap, adux1020_def_conf,
+ ARRAY_SIZE(adux1020_def_conf));
+ if (ret < 0)
+ return ret;
+
+ ret = adux1020_flush_fifo(data);
+ if (ret < 0)
+ return ret;
+
+ /* Use LED_IREF for proximity mode */
+ ret = regmap_update_bits(data->regmap, ADUX1020_REG_LED_CURRENT,
+ ADUX1020_LED_PIREF_EN, 0);
+ if (ret < 0)
+ return ret;
+
+ /* Mask all interrupts */
+ return regmap_update_bits(data->regmap, ADUX1020_REG_INT_MASK,
+ ADUX1020_MODE_INT_MASK, ADUX1020_MODE_INT_DISABLE);
+}
+
+static int adux1020_probe(struct i2c_client *client,
+ const struct i2c_device_id *id)
+{
+ struct adux1020_data *data;
+ struct iio_dev *indio_dev;
+ int ret;
+
+ indio_dev = devm_iio_device_alloc(&client->dev, sizeof(*data));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ indio_dev->dev.parent = &client->dev;
+ indio_dev->info = &adux1020_info;
+ indio_dev->name = ADUX1020_DRV_NAME;
+ indio_dev->channels = adux1020_channels;
+ indio_dev->num_channels = ARRAY_SIZE(adux1020_channels);
+ indio_dev->modes = INDIO_DIRECT_MODE;
+
+ data = iio_priv(indio_dev);
+
+ data->regmap = devm_regmap_init_i2c(client, &adux1020_regmap_config);
+ if (IS_ERR(data->regmap)) {
+ dev_err(&client->dev, "regmap initialization failed.\n");
+ return PTR_ERR(data->regmap);
+ }
+
+ data->client = client;
+ data->indio_dev = indio_dev;
+ mutex_init(&data->lock);
+
+ ret = adux1020_chip_init(data);
+ if (ret)
+ return ret;
+
+ if (client->irq) {
+ ret = devm_request_threaded_irq(&client->dev, client->irq,
+ NULL, adux1020_interrupt_handler,
+ IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
+ ADUX1020_DRV_NAME, indio_dev);
+ if (ret) {
+ dev_err(&client->dev, "irq request error %d\n", -ret);
+ return ret;
+ }
+ }
+
+ return devm_iio_device_register(&client->dev, indio_dev);
+}
+
+static const struct i2c_device_id adux1020_id[] = {
+ { "adux1020", 0 },
+ {}
+};
+MODULE_DEVICE_TABLE(i2c, adux1020_id);
+
+static const struct of_device_id adux1020_of_match[] = {
+ { .compatible = "adi,adux1020" },
+ { }
+};
+MODULE_DEVICE_TABLE(of, adux1020_of_match);
+
+static struct i2c_driver adux1020_driver = {
+ .driver = {
+ .name = ADUX1020_DRV_NAME,
+ .of_match_table = adux1020_of_match,
+ },
+ .probe = adux1020_probe,
+ .id_table = adux1020_id,
+};
+module_i2c_driver(adux1020_driver);
+
+MODULE_AUTHOR("Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>");
+MODULE_DESCRIPTION("ADUX1020 photometric sensor");
+MODULE_LICENSE("GPL");
--
2.17.1