[PATCH 7/8] iio: proximity: Add support for Azoteq IQS622 proximity sensor

Jeff LaBundy
2019-10-21T04:19:21Z

This patch adds support for the Azoteq IQS622 proximity sensor,
capable of reporting a unitless measurement of a target's prox-
imity to the sensor.

Signed-off-by: Jeff LaBundy <jeff@labundy.com>
---
drivers/iio/proximity/Kconfig | 10 ++
drivers/iio/proximity/Makefile | 1 +
drivers/iio/proximity/iqs622-prox.c | 334 ++++++++++++++++++++++++++++++++++++
3 files changed, 345 insertions(+)
create mode 100644 drivers/iio/proximity/iqs622-prox.c

diff --git a/drivers/iio/proximity/Kconfig b/drivers/iio/proximity/Kconfig
index d536014..2366fd7 100644
--- a/drivers/iio/proximity/Kconfig
+++ b/drivers/iio/proximity/Kconfig
@@ -21,6 +21,16 @@ endmenu

menu "Proximity and distance sensors"

+config IQS622_PROX
+ tristate "Azoteq IQS622 proximity sensor"
+ depends on MFD_IQS62X
+ help
+ Say Y here if you want to build support for the Azoteq IQS622
+ proximity sensor.
+
+ To compile this driver as a module, choose M here: the module
+ will be called iqs622-prox.
+
config ISL29501
tristate "Intersil ISL29501 Time Of Flight sensor"
depends on I2C
diff --git a/drivers/iio/proximity/Makefile b/drivers/iio/proximity/Makefile
index 0bb5f9d..802ba9d 100644
--- a/drivers/iio/proximity/Makefile
+++ b/drivers/iio/proximity/Makefile
@@ -5,6 +5,7 @@

# When adding new entries keep the list in alphabetical order
obj-$(CONFIG_AS3935) += as3935.o
+obj-$(CONFIG_IQS622_PROX) += iqs622-prox.o
obj-$(CONFIG_ISL29501) += isl29501.o
obj-$(CONFIG_LIDAR_LITE_V2) += pulsedlight-lidar-lite-v2.o
obj-$(CONFIG_MB1232) += mb1232.o
diff --git a/drivers/iio/proximity/iqs622-prox.c b/drivers/iio/proximity/iqs622-prox.c
new file mode 100644
index 0000000..a805fb21
--- /dev/null
+++ b/drivers/iio/proximity/iqs622-prox.c
@@ -0,0 +1,334 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * Azoteq IQS622 Proximity Sensor
+ *
+ * Copyright (C) 2019
+ * Author: 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/property.h>
+#include <linux/regmap.h>
+
+#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_PROX_MAX 255
+#define IQS622_IR_THRESH_PROX_SHIFT 0
+
+#define IQS622_IR_THRESH_TOUCH 0x92
+#define IQS622_IR_THRESH_TOUCH_MAX 1020
+#define IQS622_IR_THRESH_TOUCH_SHIFT 2
+
+struct iqs622_prox_private {
+ struct iqs62x_core *iqs62x;
+ struct notifier_block notifier;
+ struct mutex lock;
+ bool thresh_prox;
+ bool event_en;
+ u8 thresh;
+ u8 flags;
+};
+
+static int iqs622_prox_init(struct iqs622_prox_private *iqs622_prox)
+{
+ struct iqs62x_core *iqs62x = iqs622_prox->iqs62x;
+ unsigned int val;
+ int error;
+
+ mutex_lock(&iqs622_prox->lock);
+
+ error = regmap_write(iqs62x->map,
+ iqs622_prox->thresh_prox ? IQS622_IR_THRESH_PROX :
+ IQS622_IR_THRESH_TOUCH,
+ iqs622_prox->thresh);
+ if (error)
+ goto err_mutex;
+
+ error = regmap_read(iqs62x->map, IQS622_IR_FLAGS, &val);
+ if (error)
+ goto err_mutex;
+ iqs622_prox->flags = val;
+
+ error = regmap_update_bits(iqs62x->map, IQS620_GLBL_EVENT_MASK,
+ iqs62x->dev_desc->ir_mask,
+ iqs622_prox->event_en ? 0 : 0xFF);
+
+err_mutex:
+ mutex_unlock(&iqs622_prox->lock);
+
+ return error;
+}
+
+static int iqs622_prox_notifier(struct notifier_block *notifier,
+ unsigned long event_flags, void *context)
+{
+ struct iqs62x_event_data *event_data = context;
+ struct iqs622_prox_private *iqs622_prox;
+ struct iio_dev *indio_dev;
+ enum iio_event_direction dir;
+ int error;
+ u8 flags_mask;
+
+ iqs622_prox = container_of(notifier, struct iqs622_prox_private,
+ notifier);
+ indio_dev = iio_priv_to_dev(iqs622_prox);
+
+ if (event_flags & BIT(IQS62X_EVENT_SYS_RESET)) {
+ error = iqs622_prox_init(iqs622_prox);
+ if (error) {
+ dev_err(indio_dev->dev.parent,
+ "Failed to re-initialize device: %d\n", error);
+ return NOTIFY_BAD;
+ }
+
+ return NOTIFY_OK;
+ }
+
+ flags_mask = iqs622_prox->thresh_prox ? IQS622_IR_FLAGS_PROX :
+ IQS622_IR_FLAGS_TOUCH;
+
+ if (!((event_data->ir_flags ^ iqs622_prox->flags) & flags_mask))
+ return NOTIFY_DONE;
+
+ iqs622_prox->flags = event_data->ir_flags;
+
+ if (!iqs622_prox->event_en)
+ return NOTIFY_OK;
+
+ dir = iqs622_prox->flags & flags_mask ? IIO_EV_DIR_RISING :
+ IIO_EV_DIR_FALLING;
+
+ iio_push_event(indio_dev,
+ IIO_UNMOD_EVENT_CODE(IIO_PROXIMITY, 0,
+ IIO_EV_TYPE_THRESH, dir),
+ iio_get_time_ns(indio_dev));
+
+ return NOTIFY_OK;
+}
+
+static void iqs622_prox_notifier_unregister(void *context)
+{
+ struct iqs622_prox_private *iqs622_prox = context;
+ struct iio_dev *indio_dev = iio_priv_to_dev(iqs622_prox);
+ int error;
+
+ error = blocking_notifier_chain_unregister(&iqs622_prox->iqs62x->nh,
+ &iqs622_prox->notifier);
+ if (error)
+ dev_err(indio_dev->dev.parent,
+ "Failed to unregister notifier: %d\n", error);
+}
+
+static int iqs622_prox_read_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int *val, int *val2, long mask)
+{
+ struct iqs622_prox_private *iqs622_prox = iio_priv(indio_dev);
+ struct iqs62x_core *iqs62x = iqs622_prox->iqs62x;
+ int error;
+ __le16 val_buf;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_RAW:
+ error = regmap_raw_read(iqs62x->map, IQS622_IR_UI_OUT,
+ &val_buf, sizeof(val_buf));
+ if (error)
+ return error;
+
+ *val = le16_to_cpu(val_buf);
+ return IIO_VAL_INT;
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static int iqs622_prox_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 iqs622_prox_private *iqs622_prox = iio_priv(indio_dev);
+
+ return iqs622_prox->event_en;
+}
+
+static int iqs622_prox_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 iqs622_prox_private *iqs622_prox = iio_priv(indio_dev);
+ struct iqs62x_core *iqs62x = iqs622_prox->iqs62x;
+ int error;
+
+ mutex_lock(&iqs622_prox->lock);
+
+ error = regmap_update_bits(iqs62x->map, IQS620_GLBL_EVENT_MASK,
+ iqs62x->dev_desc->ir_mask, state ? 0 : 0xFF);
+ if (!error)
+ iqs622_prox->event_en = state;
+
+ mutex_unlock(&iqs622_prox->lock);
+
+ return error;
+}
+
+static int iqs622_prox_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 iqs622_prox_private *iqs622_prox = iio_priv(indio_dev);
+
+ *val = iqs622_prox->thresh;
+ *val <<= (iqs622_prox->thresh_prox ? IQS622_IR_THRESH_PROX_SHIFT :
+ IQS622_IR_THRESH_TOUCH_SHIFT);
+
+ return IIO_VAL_INT;
+}
+
+static int iqs622_prox_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 iqs622_prox_private *iqs622_prox = iio_priv(indio_dev);
+ struct iqs62x_core *iqs62x = iqs622_prox->iqs62x;
+ int error = -EINVAL;
+
+ mutex_lock(&iqs622_prox->lock);
+
+ if (val > (iqs622_prox->thresh_prox ? IQS622_IR_THRESH_PROX_MAX :
+ IQS622_IR_THRESH_TOUCH_MAX))
+ goto err_mutex;
+ val >>= (iqs622_prox->thresh_prox ? IQS622_IR_THRESH_PROX_SHIFT :
+ IQS622_IR_THRESH_TOUCH_SHIFT);
+
+ error = regmap_write(iqs62x->map,
+ iqs622_prox->thresh_prox ? IQS622_IR_THRESH_PROX :
+ IQS622_IR_THRESH_TOUCH,
+ val);
+ if (!error)
+ iqs622_prox->thresh = val;
+
+err_mutex:
+ mutex_unlock(&iqs622_prox->lock);
+
+ return error;
+}
+
+static const struct iio_info iqs622_prox_info = {
+ .read_raw = &iqs622_prox_read_raw,
+ .read_event_config = iqs622_prox_read_event_config,
+ .write_event_config = iqs622_prox_write_event_config,
+ .read_event_value = iqs622_prox_read_event_value,
+ .write_event_value = iqs622_prox_write_event_value,
+};
+
+static const struct iio_event_spec iqs622_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_prox_channels[] = {
+ {
+ .type = IIO_PROXIMITY,
+ .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
+ .event_spec = iqs622_prox_events,
+ .num_event_specs = ARRAY_SIZE(iqs622_prox_events),
+ },
+};
+
+static int iqs622_prox_probe(struct platform_device *pdev)
+{
+ struct iqs62x_core *iqs62x = dev_get_drvdata(pdev->dev.parent);
+ struct iqs622_prox_private *iqs622_prox;
+ struct iio_dev *indio_dev;
+ unsigned int val;
+ int error;
+
+ indio_dev = devm_iio_device_alloc(&pdev->dev, sizeof(*iqs622_prox));
+ if (!indio_dev)
+ return -ENOMEM;
+
+ indio_dev->modes = INDIO_DIRECT_MODE;
+ indio_dev->dev.parent = &pdev->dev;
+ indio_dev->channels = iqs622_prox_channels;
+ indio_dev->num_channels = ARRAY_SIZE(iqs622_prox_channels);
+ indio_dev->name = iqs62x->dev_desc->dev_name;
+ indio_dev->info = &iqs622_prox_info;
+
+ iqs622_prox = iio_priv(indio_dev);
+ iqs622_prox->iqs62x = iqs62x;
+
+ iqs622_prox->thresh_prox = device_property_read_bool(&pdev->dev,
+ "azoteq,use-prox");
+
+ error = regmap_read(iqs62x->map,
+ iqs622_prox->thresh_prox ? IQS622_IR_THRESH_PROX :
+ IQS622_IR_THRESH_TOUCH,
+ &val);
+ if (error)
+ return error;
+ iqs622_prox->thresh = val;
+
+ mutex_init(&iqs622_prox->lock);
+
+ error = iqs622_prox_init(iqs622_prox);
+ if (error)
+ return error;
+
+ iqs622_prox->notifier.notifier_call = iqs622_prox_notifier;
+ error = blocking_notifier_chain_register(&iqs622_prox->iqs62x->nh,
+ &iqs622_prox->notifier);
+ if (error) {
+ dev_err(&pdev->dev, "Failed to register notifier: %d\n", error);
+ return error;
+ }
+
+ error = devm_add_action_or_reset(&pdev->dev,
+ iqs622_prox_notifier_unregister,
+ iqs622_prox);
+ if (error) {
+ dev_err(&pdev->dev, "Failed to add action: %d\n", error);
+ return error;
+ }
+
+ return devm_iio_device_register(&pdev->dev, indio_dev);
+}
+
+static struct platform_driver iqs622_prox_platform_driver = {
+ .driver = {
+ .name = IQS622_DRV_NAME_PROX,
+ },
+ .probe = iqs622_prox_probe,
+};
+module_platform_driver(iqs622_prox_platform_driver);
+
+MODULE_AUTHOR("Jeff LaBundy <jeff@labundy.com>");
+MODULE_DESCRIPTION("Azoteq IQS622 Proximity Sensor");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("platform:" IQS622_DRV_NAME_PROX);
--
2.7.4