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