This patch adds support for the ap3216c ambient light and proximity sensor. Supported features include: * Illuminance (lux) * Proximity (raw) * IR (raw) * Rising/falling threshold events for illuminance and proximity * Calibration scale for illuminance * Calibration bias for proximity Signed-off-by: Robert Eshleman <bobbyeshleman@xxxxxxxxx> --- drivers/iio/light/Kconfig | 11 + drivers/iio/light/Makefile | 1 + drivers/iio/light/ap3216c.c | 793 ++++++++++++++++++++++++++++++++++++ 3 files changed, 805 insertions(+) create mode 100644 drivers/iio/light/ap3216c.c diff --git a/drivers/iio/light/Kconfig b/drivers/iio/light/Kconfig index 36f458433480..74688d19beb1 100644 --- a/drivers/iio/light/Kconfig +++ b/drivers/iio/light/Kconfig @@ -41,6 +41,17 @@ config AL3320A To compile this driver as a module, choose M here: the module will be called al3320a. +config AP3216C + tristate "AP3216C Ambient Light and Proximity sensor" + select REGMAP_I2C + depends on I2C + help + Say Y here to build a driver for the AP3216C Ambient Light and + Proximity sensor. + + To compile this driver as a module, choose M here: the + module will be called ap3216c. + config APDS9300 tristate "APDS9300 ambient light sensor" depends on I2C diff --git a/drivers/iio/light/Makefile b/drivers/iio/light/Makefile index 286bf3975372..7d2f8fa0f30d 100644 --- a/drivers/iio/light/Makefile +++ b/drivers/iio/light/Makefile @@ -7,6 +7,7 @@ obj-$(CONFIG_ACPI_ALS) += acpi-als.o obj-$(CONFIG_ADJD_S311) += adjd_s311.o obj-$(CONFIG_AL3320A) += al3320a.o +obj-$(CONFIG_AP3216C) += ap3216c.o obj-$(CONFIG_APDS9300) += apds9300.o obj-$(CONFIG_APDS9960) += apds9960.o obj-$(CONFIG_BH1750) += bh1750.o diff --git a/drivers/iio/light/ap3216c.c b/drivers/iio/light/ap3216c.c new file mode 100644 index 000000000000..12802b45c01c --- /dev/null +++ b/drivers/iio/light/ap3216c.c @@ -0,0 +1,793 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * AP3216C Ambient Light and Infrared Proximity Sensor + * + * Copyright (c) 2019, Robert Eshleman. + * + * Datasheet: https://pdf-datasheet-datasheet.netdna-ssl.com/pdf-down/A/P/3/AP3216C-LITE-ON.pdf + * + * 7-bit I2C slave address 0x1E + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/i2c.h> +#include <linux/interrupt.h> +#include <linux/bits.h> +#include <linux/regmap.h> +#include <linux/iio/iio.h> +#include <linux/iio/sysfs.h> +#include <linux/iio/events.h> + +#define AP3216C_DRV_NAME "ap3216c" + +/* register addresses */ +#define AP3216C_SYS 0x0 +#define AP3216C_INT_STATUS 0x01 +#define AP3216C_INT_CLR 0x02 +#define AP3216C_IR_DATA_LO 0x0A +#define AP3216C_IR_DATA_HI 0x0B +#define AP3216C_ALS_DATA_LO 0x0C +#define AP3216C_ALS_DATA_HI 0x0D +#define AP3216C_PS_DATA_LO 0x0E +#define AP3216C_PS_DATA_HI 0x0F +#define AP3216C_ALS_CFG 0x10 +#define AP3216C_ALS_CALIB 0x19 +#define AP3216C_ALS_LO_THR_LO 0x1A +#define AP3216C_ALS_LO_THR_HI 0x1B +#define AP3216C_ALS_HI_THR_LO 0x1C +#define AP3216C_ALS_HI_THR_HI 0x1D +#define AP3216C_PS_CFG 0x20 +#define AP3216C_PS_CALIB_LO 0x28 +#define AP3216C_PS_CALIB_HI 0x29 +#define AP3216C_PS_LO_THR_LO 0x2A +#define AP3216C_PS_LO_THR_HI 0x2B +#define AP3216C_PS_HI_THR_LO 0x2C +#define AP3216C_PS_HI_THR_HI 0x2D + +/* SYS_MODE mask and config value */ +#define AP3216C_SYS_MODE_ALS_PS GENMASK(1, 0) +#define AP3216C_SYS_MODE_ALS_ONLY 0x01 + +/* INT_STATUS masks and config value */ +#define AP3216C_INT_STATUS_ALS_MASK 1 +#define AP3216C_INT_STATUS_PS_MASK (1 << 1) +#define AP3216C_INT_STATUS_CLR GENMASK(1, 0) +#define AP3216C_INT_CLR_MANUAL 1 + +/* IR_DATA mask/shift */ +#define AP3216C_IR_DATA_LO_MASK GENMASK(1, 0) +#define AP3216C_IR_DATA_HI_SHIFT 2 + +/* ALS_DATA shift and fractional helper */ +#define AP3216C_ALS_DATA_HI_SHIFT 8 +#define AP3216C_ALS_DATA_DENOM 100000 + +/* ALS_CALIB masks/shifts */ +#define AP3216C_ALS_CALIB_INT_MASK GENMASK(7, 6) +#define AP3216C_ALS_CALIB_INT_SHIFT 6 +#define AP3216C_ALS_CALIB_DEC_MASK GENMASK(5, 0) + +/* PS_DATA shifts/masks/bits */ +#define AP3216C_PS_DATA_LO_MASK GENMASK(3, 0) +#define AP3216C_PS_DATA_LO_IR_OF BIT(6) +#define AP3216C_PS_DATA_HI_MASK GENMASK(5, 0) +#define AP3216C_PS_DATA_HI_SHIFT 4 +#define AP3216C_PS_DATA_HI_IR_OF BIT(6) + +/* ALS_CFG masks */ +#define AP3216C_ALS_CFG_GAIN_MASK GENMASK(5, 4) + +/* ALS_CALIB shifts */ +#define AP3216C_ALS_CALIB_INT_SHIFT 6 + +/* ALS_HI_THR masks and shifts */ +#define AP3216C_ALS_HI_THR_LO_MASK GENMASK(7, 0) +#define AP3216C_ALS_HI_THR_HI_SHIFT 8 +#define AP3216C_ALS_HI_THR_HI_MASK GENMASK(7, 4) +#define AP3216C_ALS_HI_THR_HI_SHIFT 8 + +/* ALS_LO_THR masks and shifts */ +#define AP3216C_ALS_LO_THR_LO_MASK GENMASK(3, 0) +#define AP3216C_ALS_LO_THR_HI_MASK GENMASK(7, 4) +#define AP3216C_ALS_LO_THR_HI_SHIFT 8 + +/* PS_CFG reg mask/shift/bit values */ +#define AP3216C_PS_CFG_GAIN_MASK GENMASK(3, 2) +#define AP3216C_PS_CFG_GAIN_SHIFT 2 +#define AP3216C_PS_CFG_GAIN(val) \ + (1 << ((val & AP3216C_PS_CFG_GAIN_MASK) >> AP3216C_PS_CFG_GAIN_SHIFT)) + +/* PS_LO and PS_HI shift/mask and multiplier values */ +#define AP3216C_PS_LO_THR_HI_MULT 4 +#define AP3216C_PS_HI_THR_HI_SHIFT 2 +#define AP3216C_PS_HI_THR_HI_MULT 4 + +/* PS_THR_LO and PS_THR_HI masks */ +#define AP3216C_PS_THR_LO_MASK GENMASK(1, 0) +#define AP3216C_PS_THR_HI_MASK GENMASK(10, 2) + +/* PS_CALIB_HI and PS_CALIB_LO shift/mask/bit values */ +#define AP3216C_PS_CALIB_HI_SHIFT 1 +#define AP3216C_PS_CALIB_HI_MASK GENMASK(8, 1) +#define AP3216C_PS_CALIB_LO_MASK BIT(0) + +/* ALS fractional helper values */ +#define AP3216C_ALS_INTEG_MULT 10000 +#define AP3216C_ALS_FRACT_DIV 100 + +/* ALS_CALIB min/max values (0.0 <= ALS_CALIB <= 3.984375) */ +#define AP3216C_ALS_CALIB_INT_MIN 0 +#define AP3216C_ALS_CALIB_DEC_MIN 0 +#define AP3216C_ALS_CALIB_INT_MAX 3 +#define AP3216C_ALS_CALIB_DEC_MAX 984375 + +/* ALS_CALIB conversion denominator */ +#define AP3216C_ALS_CALIB_DENOM 64 + +#define AP3216C_IIO_MULT 1000000 + +static u16 ap3216c_gain_array[] = { + 3500, /* 0.3500 lux resolution */ + 788, /* 0.0788 lux resolution */ + 197, /* 0.0197 lux resolution */ + 49, /* 0.0049 lux resolution */ +}; + +struct ap3216c_data { + struct regmap *regmap; + struct i2c_client *client; + bool als_thresh_en; + bool prox_thresh_en; +}; + +static const struct iio_event_spec ap3216c_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_shared_by_type = BIT(IIO_EV_INFO_ENABLE), + }, +}; + +static const struct iio_chan_spec ap3216c_channels[] = { + { + .type = IIO_LIGHT, + .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) | + BIT(IIO_CHAN_INFO_CALIBSCALE), + .event_spec = ap3216c_event_spec, + .num_event_specs = ARRAY_SIZE(ap3216c_event_spec), + }, + { + .type = IIO_PROXIMITY, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | + BIT(IIO_CHAN_INFO_CALIBBIAS), + .event_spec = ap3216c_event_spec, + .num_event_specs = ARRAY_SIZE(ap3216c_event_spec), + }, + { + .type = IIO_LIGHT, + .modified = 1, + .channel2 = IIO_MOD_LIGHT_IR, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + } +}; + +static int ap3216c_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) +{ + struct ap3216c_data *data = iio_priv(indio_dev); + int cfg, gain; + int integral, fractional; + int lo, hi; + u16 thr; + int ret; + + switch (chan->type) { + case IIO_LIGHT: + ret = regmap_read(data->regmap, AP3216C_ALS_CFG, &cfg); + if (ret < 0) + return ret; + + gain = ap3216c_gain_array[cfg & AP3216C_ALS_CFG_GAIN_MASK]; + integral = val * AP3216C_ALS_INTEG_MULT / gain; + fractional = val2 / AP3216C_ALS_FRACT_DIV / gain; + + thr = integral + fractional; + + switch (dir) { + case IIO_EV_DIR_RISING: + ret = regmap_write(data->regmap, AP3216C_ALS_HI_THR_LO, + thr & AP3216C_ALS_HI_THR_LO_MASK); + if (ret < 0) + return ret; + + ret = regmap_write(data->regmap, + AP3216C_ALS_HI_THR_HI, + (thr & AP3216C_ALS_HI_THR_HI_MASK) >> + AP3216C_ALS_HI_THR_HI_SHIFT); + if (ret < 0) + return ret; + + return ret; + + case IIO_EV_DIR_FALLING: + ret = regmap_write(data->regmap, + AP3216C_ALS_LO_THR_LO, + thr & AP3216C_ALS_LO_THR_LO_MASK); + + if (ret < 0) + return ret; + + ret = regmap_write(data->regmap, + AP3216C_ALS_LO_THR_HI, + (thr & AP3216C_ALS_LO_THR_HI_MASK) >> + AP3216C_ALS_LO_THR_HI_SHIFT); + if (ret < 0) + return ret; + + return ret; + + default: + return -EINVAL; + } + return -EINVAL; + + case IIO_PROXIMITY: + lo = val & AP3216C_PS_THR_LO_MASK; + hi = (val & AP3216C_PS_THR_HI_MASK) >> + AP3216C_PS_HI_THR_HI_SHIFT; + + switch (dir) { + case IIO_EV_DIR_RISING: + ret = regmap_write(data->regmap, + AP3216C_PS_HI_THR_LO, lo); + if (ret < 0) + return ret; + + return regmap_write(data->regmap, + AP3216C_PS_HI_THR_HI, hi); + + case IIO_EV_DIR_FALLING: + ret = regmap_write(data->regmap, + AP3216C_PS_LO_THR_LO, lo); + if (ret < 0) + return ret; + + return regmap_write(data->regmap, + AP3216C_PS_LO_THR_HI, hi); + + default: + return -EINVAL; + } + + default: + return -EINVAL; + } + return -EINVAL; +} + +static int ap3216c_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) +{ + struct ap3216c_data *data = iio_priv(indio_dev); + unsigned int lo, hi; + int ret; + + switch (chan->type) { + case IIO_LIGHT: + switch (dir) { + case IIO_EV_DIR_RISING: + ret = regmap_read(data->regmap, + AP3216C_ALS_HI_THR_LO, &lo); + if (ret < 0) + return ret; + + ret = regmap_read(data->regmap, + AP3216C_ALS_HI_THR_HI, &hi); + if (ret < 0) + return ret; + + *val = (hi << AP3216C_ALS_HI_THR_HI_SHIFT) | lo; + return IIO_VAL_INT; + + case IIO_EV_DIR_FALLING: + ret = regmap_read(data->regmap, + AP3216C_ALS_LO_THR_LO, &lo); + if (ret < 0) + return ret; + + ret = regmap_read(data->regmap, + AP3216C_ALS_LO_THR_HI, &hi); + if (ret < 0) + return ret; + + *val = (hi << AP3216C_ALS_LO_THR_HI_SHIFT) | lo; + return IIO_VAL_INT; + + default: + return -EINVAL; + } + + case IIO_PROXIMITY: + switch (dir) { + case IIO_EV_DIR_RISING: + ret = regmap_read(data->regmap, + AP3216C_PS_HI_THR_LO, &lo); + if (ret < 0) + return ret; + + ret = regmap_read(data->regmap, + AP3216C_PS_HI_THR_HI, &hi); + if (ret < 0) + return ret; + + *val = (hi * AP3216C_PS_HI_THR_HI_MULT) + + (lo & AP3216C_PS_THR_LO_MASK); + + return IIO_VAL_INT; + + case IIO_EV_DIR_FALLING: + ret = regmap_read(data->regmap, + AP3216C_PS_LO_THR_LO, &lo); + if (ret < 0) + return ret; + + ret = regmap_read(data->regmap, + AP3216C_PS_LO_THR_HI, &hi); + if (ret < 0) + return ret; + + *val = (hi * AP3216C_PS_LO_THR_HI_MULT) + + (lo & AP3216C_PS_THR_LO_MASK); + + return IIO_VAL_INT; + + default: + return -EINVAL; + } + + default: + return -EINVAL; + } + + return -EINVAL; +} + +static int ap3216c_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 ap3216c_data *data = iio_priv(indio_dev); + + switch (chan->type) { + case IIO_LIGHT: + return data->als_thresh_en; + + case IIO_PROXIMITY: + return data->prox_thresh_en; + + default: + return -EINVAL; + } + + return -EINVAL; +} + +static int ap3216c_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 ap3216c_data *data = iio_priv(indio_dev); + + switch (chan->type) { + case IIO_LIGHT: + data->als_thresh_en = state; + return 0; + + case IIO_PROXIMITY: + data->prox_thresh_en = state; + return 0; + + default: + return -EINVAL; + } + + return -EINVAL; +} + +static const struct regmap_config ap3216c_regmap_config = { + .reg_bits = 8, + .val_bits = 8, + .max_register = AP3216C_PS_HI_THR_HI, +}; + +/** + * Returns integral part of decimal between 0.0 and 3.984275 + */ +static int ap3216c_als_calibscale_int(int val) +{ + if (val > AP3216C_ALS_CALIB_INT_MAX) + return AP3216C_ALS_CALIB_INT_MAX; + + if (val <= AP3216C_ALS_CALIB_INT_MIN) + return AP3216C_ALS_CALIB_INT_MIN; + + return val; +} + +/** + * Returns decimal part of decimal number between 0.0 and 3.984275 + */ +static int ap3216c_als_calibscale_dec(int val, int val2) +{ + /* Return max decimal if number exceeds calibscale max */ + if (val > AP3216C_ALS_CALIB_INT_MAX || + (val == AP3216C_ALS_CALIB_INT_MAX && + val2 > AP3216C_ALS_CALIB_DEC_MAX)) + return AP3216C_ALS_CALIB_DEC_MAX; + + /* Floor the decimal if integral below minimum */ + if (val <= AP3216C_ALS_CALIB_INT_MIN) + return AP3216C_ALS_CALIB_DEC_MIN; + + /* Floor the decimal if decimal below minimum */ + if (val2 < AP3216C_ALS_CALIB_DEC_MIN) + return AP3216C_ALS_CALIB_DEC_MIN; + + /* Return max decimal if decimal above maximum */ + if (val2 > AP3216C_ALS_CALIB_DEC_MAX) + return AP3216C_ALS_CALIB_DEC_MAX; + + return val2; +} + +static int ap3216c_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct ap3216c_data *data = iio_priv(indio_dev); + int integral, decimal; + int tmp; + int ret; + + switch (mask) { + case IIO_CHAN_INFO_CALIBSCALE: + switch (chan->type) { + case IIO_LIGHT: + integral = ap3216c_als_calibscale_int(val); + decimal = ap3216c_als_calibscale_dec(val, val2); + + tmp = integral << AP3216C_ALS_CALIB_INT_SHIFT; + + /* + * Reverse scaling by multiplying by the scaling + * denominator and dividing by IIO multiplier. + */ + tmp |= (decimal * AP3216C_ALS_CALIB_DENOM) / + AP3216C_IIO_MULT; + + return regmap_write(data->regmap, + AP3216C_ALS_CALIB, tmp); + + default: + return -EINVAL; + } + + case IIO_CHAN_INFO_CALIBBIAS: + switch (chan->type) { + case IIO_PROXIMITY: + ret = regmap_write(data->regmap, AP3216C_PS_CALIB_LO, + val & AP3216C_PS_CALIB_LO_MASK); + if (ret < 0) + return ret; + + tmp = (val & AP3216C_PS_CALIB_HI_MASK) >> + AP3216C_PS_CALIB_HI_SHIFT; + + return regmap_write(data->regmap, + AP3216C_PS_CALIB_HI, tmp); + + default: + return -EINVAL; + } + default: + return -EINVAL; + } + return -EINVAL; +} + +static int ap3216c_read_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int *val, int *val2, long mask) +{ + struct ap3216c_data *data = iio_priv(indio_dev); + int lo, hi; + int cfg, tmp; + int ret; + + switch (mask) { + case IIO_CHAN_INFO_CALIBSCALE: + switch (chan->type) { + case IIO_LIGHT: + ret = regmap_read(data->regmap, + AP3216C_ALS_CALIB, &tmp); + if (ret < 0) + return ret; + + /* Scale is multiplied by 1/64 */ + *val = tmp; + *val2 = AP3216C_ALS_CALIB_DENOM; + return IIO_VAL_FRACTIONAL; + + default: + return -EINVAL; + } + + case IIO_CHAN_INFO_CALIBBIAS: + switch (chan->type) { + case IIO_PROXIMITY: + ret = regmap_read(data->regmap, + AP3216C_PS_CALIB_LO, &lo); + if (ret < 0) + return ret; + + ret = regmap_read(data->regmap, + AP3216C_PS_CALIB_HI, &hi); + if (ret < 0) + return ret; + + + *val = lo | (hi << AP3216C_PS_CALIB_HI_SHIFT); + return IIO_VAL_INT; + + default: + return -EINVAL; + } + + case IIO_CHAN_INFO_PROCESSED: + switch (chan->type) { + case IIO_LIGHT: + ret = regmap_read(data->regmap, + AP3216C_ALS_DATA_LO, &lo); + if (ret < 0) + return ret; + + ret = regmap_read(data->regmap, + AP3216C_ALS_DATA_HI, &hi); + if (ret < 0) + return ret; + + ret = regmap_read(data->regmap, + AP3216C_ALS_CFG, &cfg); + if (ret < 0) + return ret; + + tmp = (hi << AP3216C_ALS_DATA_HI_SHIFT) | lo; + tmp *= ap3216c_gain_array[cfg & AP3216C_ALS_CFG_GAIN_MASK]; + + *val = tmp; + *val2 = AP3216C_ALS_DATA_DENOM; + + return IIO_VAL_FRACTIONAL; + default: + return -EINVAL; + } + case IIO_CHAN_INFO_RAW: + switch (chan->type) { + case IIO_LIGHT: + if (chan->channel2 != IIO_MOD_LIGHT_IR) + return -EINVAL; + + ret = regmap_read(data->regmap, + AP3216C_IR_DATA_LO, &lo); + if (ret < 0) + return ret; + + ret = regmap_read(data->regmap, + AP3216C_IR_DATA_HI, &hi); + if (ret < 0) + return ret; + + tmp = lo & AP3216C_IR_DATA_LO_MASK; + tmp |= hi << AP3216C_IR_DATA_HI_SHIFT; + *val = tmp; + + return IIO_VAL_INT; + + case IIO_PROXIMITY: + ret = regmap_read(data->regmap, + AP3216C_PS_DATA_LO, &lo); + if (ret < 0) + return ret; + + ret = regmap_read(data->regmap, + AP3216C_PS_DATA_HI, &hi); + if (ret < 0) + return ret; + + ret = regmap_read(data->regmap, + AP3216C_PS_CFG, &cfg); + if (ret < 0) + return ret; + + tmp = lo & AP3216C_PS_DATA_LO_MASK; + tmp |= (hi & AP3216C_PS_DATA_HI_MASK) << + AP3216C_PS_DATA_HI_SHIFT; + *val = tmp * AP3216C_PS_CFG_GAIN(cfg); + + return IIO_VAL_INT; + default: + return -EINVAL; + } + default: + return -EINVAL; + } + return -EINVAL; +} + +static const struct iio_info ap3216c_info = { + .read_raw = ap3216c_read_raw, + .write_raw = ap3216c_write_raw, + .read_event_value = ap3216c_read_event_value, + .write_event_value = ap3216c_write_event_value, + .read_event_config = ap3216c_read_event_config, + .write_event_config = ap3216c_write_event_config, +}; + +static int ap3216c_clear_int(struct ap3216c_data *data) +{ + return regmap_write(data->regmap, + AP3216C_INT_STATUS, AP3216C_INT_STATUS_CLR); +} + +static irqreturn_t ap3216c_event_handler(int irq, void *p) +{ + struct iio_dev *indio_dev = p; + struct ap3216c_data *data = iio_priv(indio_dev); + int status; + s64 timestamp; + int ret; + + ret = regmap_read(data->regmap, AP3216C_INT_STATUS, &status); + if (ret) { + /* + * Without being able to guarantee the interrupt came from + * this device, we must return IRQ_HANDLED instead of + * IRQ_NONE. + */ + dev_err(&data->client->dev, "error reading IRQ status\n"); + return IRQ_HANDLED; + } + + /* The IRQ was not from this device */ + if (!status) + return IRQ_NONE; + + timestamp = iio_get_time_ns(indio_dev); + if ((status & AP3216C_INT_STATUS_PS_MASK) && data->prox_thresh_en) + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_EITHER), + timestamp); + + if ((status & AP3216C_INT_STATUS_ALS_MASK) && data->als_thresh_en) + iio_push_event(indio_dev, + IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0, + IIO_EV_TYPE_THRESH, + IIO_EV_DIR_EITHER), + timestamp); + + ret = ap3216c_clear_int(data); + if (ret < 0) + dev_err(&data->client->dev, "error clearing IRQ\n"); + + return IRQ_HANDLED; +} + +static int ap3216c_probe(struct i2c_client *client, + const struct i2c_device_id *id) +{ + struct ap3216c_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); + data->client = client; + indio_dev->dev.parent = &client->dev; + indio_dev->info = &ap3216c_info; + indio_dev->name = AP3216C_DRV_NAME; + indio_dev->channels = ap3216c_channels; + indio_dev->num_channels = ARRAY_SIZE(ap3216c_channels); + + data->regmap = devm_regmap_init_i2c(client, &ap3216c_regmap_config); + if (IS_ERR(data->regmap)) { + dev_err(&client->dev, "Failed to allocate register map\n"); + return PTR_ERR(data->regmap); + } + + /* Default to thresh events disabled */ + data->als_thresh_en = false; + data->prox_thresh_en = false; + + /* + * Require that that the interrupt is cleared only when the INT + * register is written to, instead of when data is read. This + * prevents the interrupt from falsely reporting IRQ_NONE. + */ + ret = regmap_write(data->regmap, + AP3216C_INT_CLR, AP3216C_INT_CLR_MANUAL); + if (ret < 0) + return ret; + + /* Before setting up IRQ, clear any stale interrupt */ + ret = ap3216c_clear_int(data); + if (ret < 0) + return ret; + + if (client->irq) { + ret = devm_request_threaded_irq(&client->dev, client->irq, + NULL, ap3216c_event_handler, + IRQF_TRIGGER_FALLING | + IRQF_SHARED | IRQF_ONESHOT, + client->name, indio_dev); + if (ret) + return ret; + } + + /* Enable ALS and PS+IR */ + ret = regmap_write(data->regmap, AP3216C_SYS, AP3216C_SYS_MODE_ALS_PS); + if (ret < 0) + return ret; + + return devm_iio_device_register(&client->dev, indio_dev); +} + +static const struct of_device_id ap3216c_of_match[] = { + { .compatible = "liteon,ap3216c", }, + { }, +}; +MODULE_DEVICE_TABLE(of, ap3216c_of_match); + +static const struct i2c_device_id ap3216c_id[] = { + {"ap3216c", 0}, + { } +}; +MODULE_DEVICE_TABLE(i2c, ap3216c_id); + +static struct i2c_driver ap3216c_driver = { + .driver = { + .name = AP3216C_DRV_NAME, + }, + .probe = ap3216c_probe, + .id_table = ap3216c_id, +}; +module_i2c_driver(ap3216c_driver); + +MODULE_AUTHOR("Robert Eshleman <bobbyeshleman@xxxxxxxxx>"); +MODULE_DESCRIPTION("APC3216C Ambient Light and Proximity Sensor"); +MODULE_LICENSE("GPL v2"); -- 2.20.1
