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iio: light: Add support for Azoteq IQS621/622 ambient light sensors 

This patch adds support for the Azoteq IQS621 and IQS622 ambient light
sensors, both of which can report a four-bit representation of ambient
light intensity.

The IQS621 can additionally report illuminace directly in units of lux,
while the IQS622 can report a four-bit representation of infrared light
intensity. Furthermore, the IQS622 can report a unitless measurement of
a target's proximity to the device.

Signed-off-by: Jeff LaBundy <jeff@labundy.com>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
This commit is contained in:
Jeff LaBundy 2020-02-16 17:32:10 -06:00 committed by Lee Jones
parent 8ba447109a
commit b081b73820
3 changed files with 628 additions and 0 deletions
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10
drivers/iio/light/Kconfig
View File

@ -173,6 +173,16 @@ config GP2AP020A00F
To compile this driver as a module, choose M here: the
module will be called gp2ap020a00f.
config IQS621_ALS
tristate "Azoteq IQS621/622 ambient light sensors"
depends on MFD_IQS62X || COMPILE_TEST
help
Say Y here if you want to build support for the Azoteq IQS621
and IQS622 ambient light sensors.
To compile this driver as a module, choose M here: the module
will be called iqs621-als.
config SENSORS_ISL29018
tristate "Intersil 29018 light and proximity sensor"
depends on I2C

1
drivers/iio/light/Makefile
View File

@ -21,6 +21,7 @@ obj-$(CONFIG_IIO_CROS_EC_LIGHT_PROX) += cros_ec_light_prox.o
obj-$(CONFIG_GP2AP020A00F) += gp2ap020a00f.o
obj-$(CONFIG_HID_SENSOR_ALS) += hid-sensor-als.o
obj-$(CONFIG_HID_SENSOR_PROX) += hid-sensor-prox.o
obj-$(CONFIG_IQS621_ALS) += iqs621-als.o
obj-$(CONFIG_SENSORS_ISL29018) += isl29018.o
obj-$(CONFIG_SENSORS_ISL29028) += isl29028.o
obj-$(CONFIG_ISL29125) += isl29125.o

617
drivers/iio/light/iqs621-als.c Normal file
View File

@ -0,0 +1,617 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Azoteq IQS621/622 Ambient Light Sensors
*
* Copyright (C) 2019 Jeff LaBundy <jeff@labundy.com>
*/
#include <linux/device.h>
#include <linux/iio/events.h>
#include <linux/iio/iio.h>
#include <linux/kernel.h>
#include <linux/mfd/iqs62x.h>
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/notifier.h>
#include <linux/platform_device.h>
#include <linux/regmap.h>
#define IQS621_ALS_FLAGS_LIGHT BIT(7)
#define IQS621_ALS_FLAGS_RANGE GENMASK(3, 0)
#define IQS621_ALS_UI_OUT 0x17
#define IQS621_ALS_THRESH_DARK 0x80
#define IQS621_ALS_THRESH_LIGHT 0x81
#define IQS622_IR_RANGE 0x15
#define IQS622_IR_FLAGS 0x16
#define IQS622_IR_FLAGS_TOUCH BIT(1)
#define IQS622_IR_FLAGS_PROX BIT(0)
#define IQS622_IR_UI_OUT 0x17
#define IQS622_IR_THRESH_PROX 0x91
#define IQS622_IR_THRESH_TOUCH 0x92
struct iqs621_als_private {
struct iqs62x_core *iqs62x;
struct notifier_block notifier;
struct mutex lock;
bool light_en;
bool range_en;
bool prox_en;
u8 als_flags;
u8 ir_flags_mask;
u8 ir_flags;
u8 thresh_light;
u8 thresh_dark;
u8 thresh_prox;
};
static int iqs621_als_init(struct iqs621_als_private *iqs621_als)
{
struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
unsigned int event_mask = 0;
int ret;
switch (iqs621_als->ir_flags_mask) {
case IQS622_IR_FLAGS_TOUCH:
ret = regmap_write(iqs62x->regmap, IQS622_IR_THRESH_TOUCH,
iqs621_als->thresh_prox);
break;
case IQS622_IR_FLAGS_PROX:
ret = regmap_write(iqs62x->regmap, IQS622_IR_THRESH_PROX,
iqs621_als->thresh_prox);
break;
default:
ret = regmap_write(iqs62x->regmap, IQS621_ALS_THRESH_LIGHT,
iqs621_als->thresh_light);
if (ret)
return ret;
ret = regmap_write(iqs62x->regmap, IQS621_ALS_THRESH_DARK,
iqs621_als->thresh_dark);
}
if (ret)
return ret;
if (iqs621_als->light_en || iqs621_als->range_en)
event_mask |= iqs62x->dev_desc->als_mask;
if (iqs621_als->prox_en)
event_mask |= iqs62x->dev_desc->ir_mask;
return regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
event_mask, 0);
}
static int iqs621_als_notifier(struct notifier_block *notifier,
unsigned long event_flags, void *context)
{
struct iqs62x_event_data *event_data = context;
struct iqs621_als_private *iqs621_als;
struct iio_dev *indio_dev;
bool light_new, light_old;
bool prox_new, prox_old;
u8 range_new, range_old;
s64 timestamp;
int ret;
iqs621_als = container_of(notifier, struct iqs621_als_private,
notifier);
indio_dev = iio_priv_to_dev(iqs621_als);
timestamp = iio_get_time_ns(indio_dev);
mutex_lock(&iqs621_als->lock);
if (event_flags & BIT(IQS62X_EVENT_SYS_RESET)) {
ret = iqs621_als_init(iqs621_als);
if (ret) {
dev_err(indio_dev->dev.parent,
"Failed to re-initialize device: %d\n", ret);
ret = NOTIFY_BAD;
} else {
ret = NOTIFY_OK;
}
goto err_mutex;
}
if (!iqs621_als->light_en && !iqs621_als->range_en &&
!iqs621_als->prox_en) {
ret = NOTIFY_DONE;
goto err_mutex;
}
/* IQS621 only */
light_new = event_data->als_flags & IQS621_ALS_FLAGS_LIGHT;
light_old = iqs621_als->als_flags & IQS621_ALS_FLAGS_LIGHT;
if (iqs621_als->light_en && light_new && !light_old)
iio_push_event(indio_dev,
IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0,
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_RISING),
timestamp);
else if (iqs621_als->light_en && !light_new && light_old)
iio_push_event(indio_dev,
IIO_UNMOD_EVENT_CODE(IIO_LIGHT, 0,
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_FALLING),
timestamp);
/* IQS621 and IQS622 */
range_new = event_data->als_flags & IQS621_ALS_FLAGS_RANGE;
range_old = iqs621_als->als_flags & IQS621_ALS_FLAGS_RANGE;
if (iqs621_als->range_en && (range_new > range_old))
iio_push_event(indio_dev,
IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0,
IIO_EV_TYPE_CHANGE,
IIO_EV_DIR_RISING),
timestamp);
else if (iqs621_als->range_en && (range_new < range_old))
iio_push_event(indio_dev,
IIO_UNMOD_EVENT_CODE(IIO_INTENSITY, 0,
IIO_EV_TYPE_CHANGE,
IIO_EV_DIR_FALLING),
timestamp);
/* IQS622 only */
prox_new = event_data->ir_flags & iqs621_als->ir_flags_mask;
prox_old = iqs621_als->ir_flags & iqs621_als->ir_flags_mask;
if (iqs621_als->prox_en && prox_new && !prox_old)
iio_push_event(indio_dev,
IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_RISING),
timestamp);
else if (iqs621_als->prox_en && !prox_new && prox_old)
iio_push_event(indio_dev,
IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
IIO_EV_TYPE_THRESH,
IIO_EV_DIR_FALLING),
timestamp);
iqs621_als->als_flags = event_data->als_flags;
iqs621_als->ir_flags = event_data->ir_flags;
ret = NOTIFY_OK;
err_mutex:
mutex_unlock(&iqs621_als->lock);
return ret;
}
static void iqs621_als_notifier_unregister(void *context)
{
struct iqs621_als_private *iqs621_als = context;
struct iio_dev *indio_dev = iio_priv_to_dev(iqs621_als);
int ret;
ret = blocking_notifier_chain_unregister(&iqs621_als->iqs62x->nh,
&iqs621_als->notifier);
if (ret)
dev_err(indio_dev->dev.parent,
"Failed to unregister notifier: %d\n", ret);
}
static int iqs621_als_read_raw(struct iio_dev *indio_dev,
struct iio_chan_spec const *chan,
int *val, int *val2, long mask)
{
struct iqs621_als_private *iqs621_als = iio_priv(indio_dev);
struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
int ret;
__le16 val_buf;
switch (chan->type) {
case IIO_INTENSITY:
ret = regmap_read(iqs62x->regmap, chan->address, val);
if (ret)
return ret;
*val &= IQS621_ALS_FLAGS_RANGE;
return IIO_VAL_INT;
case IIO_PROXIMITY:
case IIO_LIGHT:
ret = regmap_raw_read(iqs62x->regmap, chan->address, &val_buf,
sizeof(val_buf));
if (ret)
return ret;
*val = le16_to_cpu(val_buf);
return IIO_VAL_INT;
default:
return -EINVAL;
}
}
static int iqs621_als_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 iqs621_als_private *iqs621_als = iio_priv(indio_dev);
int ret;
mutex_lock(&iqs621_als->lock);
switch (chan->type) {
case IIO_LIGHT:
ret = iqs621_als->light_en;
break;
case IIO_INTENSITY:
ret = iqs621_als->range_en;
break;
case IIO_PROXIMITY:
ret = iqs621_als->prox_en;
break;
default:
ret = -EINVAL;
}
mutex_unlock(&iqs621_als->lock);
return ret;
}
static int iqs621_als_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 iqs621_als_private *iqs621_als = iio_priv(indio_dev);
struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
unsigned int val;
int ret;
mutex_lock(&iqs621_als->lock);
ret = regmap_read(iqs62x->regmap, iqs62x->dev_desc->als_flags, &val);
if (ret)
goto err_mutex;
iqs621_als->als_flags = val;
switch (chan->type) {
case IIO_LIGHT:
ret = regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
iqs62x->dev_desc->als_mask,
iqs621_als->range_en || state ? 0 :
0xFF);
if (!ret)
iqs621_als->light_en = state;
break;
case IIO_INTENSITY:
ret = regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
iqs62x->dev_desc->als_mask,
iqs621_als->light_en || state ? 0 :
0xFF);
if (!ret)
iqs621_als->range_en = state;
break;
case IIO_PROXIMITY:
ret = regmap_read(iqs62x->regmap, IQS622_IR_FLAGS, &val);
if (ret)
goto err_mutex;
iqs621_als->ir_flags = val;
ret = regmap_update_bits(iqs62x->regmap, IQS620_GLBL_EVENT_MASK,
iqs62x->dev_desc->ir_mask,
state ? 0 : 0xFF);
if (!ret)
iqs621_als->prox_en = state;
break;
default:
ret = -EINVAL;
}
err_mutex:
mutex_unlock(&iqs621_als->lock);
return ret;
}
static int iqs621_als_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 iqs621_als_private *iqs621_als = iio_priv(indio_dev);
int ret = IIO_VAL_INT;
mutex_lock(&iqs621_als->lock);
switch (dir) {
case IIO_EV_DIR_RISING:
*val = iqs621_als->thresh_light * 16;
break;
case IIO_EV_DIR_FALLING:
*val = iqs621_als->thresh_dark * 4;
break;
case IIO_EV_DIR_EITHER:
if (iqs621_als->ir_flags_mask == IQS622_IR_FLAGS_TOUCH)
*val = iqs621_als->thresh_prox * 4;
else
*val = iqs621_als->thresh_prox;
break;
default:
ret = -EINVAL;
}
mutex_unlock(&iqs621_als->lock);
return ret;
}
static int iqs621_als_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 iqs621_als_private *iqs621_als = iio_priv(indio_dev);
struct iqs62x_core *iqs62x = iqs621_als->iqs62x;
unsigned int thresh_reg, thresh_val;
u8 ir_flags_mask, *thresh_cache;
int ret = -EINVAL;
mutex_lock(&iqs621_als->lock);
switch (dir) {
case IIO_EV_DIR_RISING:
thresh_reg = IQS621_ALS_THRESH_LIGHT;
thresh_val = val / 16;
thresh_cache = &iqs621_als->thresh_light;
ir_flags_mask = 0;
break;
case IIO_EV_DIR_FALLING:
thresh_reg = IQS621_ALS_THRESH_DARK;
thresh_val = val / 4;
thresh_cache = &iqs621_als->thresh_dark;
ir_flags_mask = 0;
break;
case IIO_EV_DIR_EITHER:
/*
* The IQS622 supports two detection thresholds, both measured
* in the same arbitrary units reported by read_raw: proximity
* (0 through 255 in steps of 1), and touch (0 through 1020 in
* steps of 4).
*
* Based on the single detection threshold chosen by the user,
* select the hardware threshold that gives the best trade-off
* between range and resolution.
*
* By default, the close-range (but coarse) touch threshold is
* chosen during probe.
*/
switch (val) {
case 0 ... 255:
thresh_reg = IQS622_IR_THRESH_PROX;
thresh_val = val;
ir_flags_mask = IQS622_IR_FLAGS_PROX;
break;
case 256 ... 1020:
thresh_reg = IQS622_IR_THRESH_TOUCH;
thresh_val = val / 4;
ir_flags_mask = IQS622_IR_FLAGS_TOUCH;
break;
default:
goto err_mutex;
}
thresh_cache = &iqs621_als->thresh_prox;
break;
default:
goto err_mutex;
}
if (thresh_val > 0xFF)
goto err_mutex;
ret = regmap_write(iqs62x->regmap, thresh_reg, thresh_val);
if (ret)
goto err_mutex;
*thresh_cache = thresh_val;
iqs621_als->ir_flags_mask = ir_flags_mask;
err_mutex:
mutex_unlock(&iqs621_als->lock);
return ret;
}
static const struct iio_info iqs621_als_info = {
.read_raw = &iqs621_als_read_raw,
.read_event_config = iqs621_als_read_event_config,
.write_event_config = iqs621_als_write_event_config,
.read_event_value = iqs621_als_read_event_value,
.write_event_value = iqs621_als_write_event_value,
};
static const struct iio_event_spec iqs621_als_range_events[] = {
{
.type = IIO_EV_TYPE_CHANGE,
.dir = IIO_EV_DIR_EITHER,
.mask_separate = BIT(IIO_EV_INFO_ENABLE),
},
};
static const struct iio_event_spec iqs621_als_light_events[] = {
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_EITHER,
.mask_separate = BIT(IIO_EV_INFO_ENABLE),
},
{
.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),
},
};
static const struct iio_chan_spec iqs621_als_channels[] = {
{
.type = IIO_INTENSITY,
.address = IQS621_ALS_FLAGS,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.event_spec = iqs621_als_range_events,
.num_event_specs = ARRAY_SIZE(iqs621_als_range_events),
},
{
.type = IIO_LIGHT,
.address = IQS621_ALS_UI_OUT,
.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
.event_spec = iqs621_als_light_events,
.num_event_specs = ARRAY_SIZE(iqs621_als_light_events),
},
};
static const struct iio_event_spec iqs622_als_prox_events[] = {
{
.type = IIO_EV_TYPE_THRESH,
.dir = IIO_EV_DIR_EITHER,
.mask_separate = BIT(IIO_EV_INFO_ENABLE) |
BIT(IIO_EV_INFO_VALUE),
},
};
static const struct iio_chan_spec iqs622_als_channels[] = {
{
.type = IIO_INTENSITY,
.channel2 = IIO_MOD_LIGHT_BOTH,
.address = IQS622_ALS_FLAGS,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.event_spec = iqs621_als_range_events,
.num_event_specs = ARRAY_SIZE(iqs621_als_range_events),
.modified = true,
},
{
.type = IIO_INTENSITY,
.channel2 = IIO_MOD_LIGHT_IR,
.address = IQS622_IR_RANGE,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.modified = true,
},
{
.type = IIO_PROXIMITY,
.address = IQS622_IR_UI_OUT,
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
.event_spec = iqs622_als_prox_events,
.num_event_specs = ARRAY_SIZE(iqs622_als_prox_events),
},
};
static int iqs621_als_probe(struct platform_device *pdev)
{
struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent);
struct iqs621_als_private *iqs621_als;
struct iio_dev *indio_dev;
unsigned int val;
int ret;
indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*iqs621_als));
if (!indio_dev)
return -ENOMEM;
iqs621_als = iio_priv(indio_dev);
iqs621_als->iqs62x = iqs62x;
if (iqs62x->dev_desc->prod_num == IQS622_PROD_NUM) {
ret = regmap_read(iqs62x->regmap, IQS622_IR_THRESH_TOUCH,
&val);
if (ret)
return ret;
iqs621_als->thresh_prox = val;
iqs621_als->ir_flags_mask = IQS622_IR_FLAGS_TOUCH;
indio_dev->channels = iqs622_als_channels;
indio_dev->num_channels = ARRAY_SIZE(iqs622_als_channels);
} else {
ret = regmap_read(iqs62x->regmap, IQS621_ALS_THRESH_LIGHT,
&val);
if (ret)
return ret;
iqs621_als->thresh_light = val;
ret = regmap_read(iqs62x->regmap, IQS621_ALS_THRESH_DARK,
&val);
if (ret)
return ret;
iqs621_als->thresh_dark = val;
indio_dev->channels = iqs621_als_channels;
indio_dev->num_channels = ARRAY_SIZE(iqs621_als_channels);
}
indio_dev->modes = INDIO_DIRECT_MODE;
indio_dev->dev.parent = &pdev->dev;
indio_dev->name = iqs62x->dev_desc->dev_name;
indio_dev->info = &iqs621_als_info;
mutex_init(&iqs621_als->lock);
iqs621_als->notifier.notifier_call = iqs621_als_notifier;
ret = blocking_notifier_chain_register(&iqs621_als->iqs62x->nh,
&iqs621_als->notifier);
if (ret) {
dev_err(&pdev->dev, "Failed to register notifier: %d\n", ret);
return ret;
}
ret = devm_add_action_or_reset(&pdev->dev,
iqs621_als_notifier_unregister,
iqs621_als);
if (ret)
return ret;
return devm_iio_device_register(&pdev->dev, indio_dev);
}
static struct platform_driver iqs621_als_platform_driver = {
.driver = {
.name = "iqs621-als",
},
.probe = iqs621_als_probe,
};
module_platform_driver(iqs621_als_platform_driver);
MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
MODULE_DESCRIPTION("Azoteq IQS621/622 Ambient Light Sensors");
MODULE_LICENSE("GPL");
MODULE_ALIAS("platform:iqs621-als");