// SPDX-License-Identifier: GPL-2.0-only
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/*
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* STMicroelectronics hts221 sensor driver
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*
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* Copyright 2016 STMicroelectronics Inc.
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*
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* Lorenzo Bianconi <lorenzo.bianconi@st.com>
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/device.h>
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#include <linux/interrupt.h>
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#include <linux/irqreturn.h>
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#include <linux/regmap.h>
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#include <linux/bitfield.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/trigger.h>
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#include <linux/iio/events.h>
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#include <linux/iio/trigger_consumer.h>
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#include <linux/iio/triggered_buffer.h>
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#include <linux/iio/buffer.h>
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#include <linux/platform_data/st_sensors_pdata.h>
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#include "hts221.h"
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#define HTS221_REG_DRDY_HL_ADDR 0x22
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#define HTS221_REG_DRDY_HL_MASK BIT(7)
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#define HTS221_REG_DRDY_PP_OD_ADDR 0x22
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#define HTS221_REG_DRDY_PP_OD_MASK BIT(6)
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#define HTS221_REG_DRDY_EN_ADDR 0x22
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#define HTS221_REG_DRDY_EN_MASK BIT(2)
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#define HTS221_REG_STATUS_ADDR 0x27
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#define HTS221_RH_DRDY_MASK BIT(1)
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#define HTS221_TEMP_DRDY_MASK BIT(0)
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static int hts221_trig_set_state(struct iio_trigger *trig, bool state)
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{
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struct iio_dev *iio_dev = iio_trigger_get_drvdata(trig);
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struct hts221_hw *hw = iio_priv(iio_dev);
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return regmap_update_bits(hw->regmap, HTS221_REG_DRDY_EN_ADDR,
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HTS221_REG_DRDY_EN_MASK,
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FIELD_PREP(HTS221_REG_DRDY_EN_MASK, state));
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}
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static const struct iio_trigger_ops hts221_trigger_ops = {
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.set_trigger_state = hts221_trig_set_state,
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};
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static irqreturn_t hts221_trigger_handler_thread(int irq, void *private)
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{
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struct hts221_hw *hw = private;
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int err, status;
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err = regmap_read(hw->regmap, HTS221_REG_STATUS_ADDR, &status);
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if (err < 0)
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return IRQ_HANDLED;
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/*
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* H_DA bit (humidity data available) is routed to DRDY line.
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* Humidity sample is computed after temperature one.
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* Here we can assume data channels are both available if H_DA bit
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* is set in status register
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*/
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if (!(status & HTS221_RH_DRDY_MASK))
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return IRQ_NONE;
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iio_trigger_poll_chained(hw->trig);
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return IRQ_HANDLED;
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}
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int hts221_allocate_trigger(struct iio_dev *iio_dev)
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{
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struct hts221_hw *hw = iio_priv(iio_dev);
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struct st_sensors_platform_data *pdata = dev_get_platdata(hw->dev);
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bool irq_active_low = false, open_drain = false;
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unsigned long irq_type;
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int err;
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irq_type = irqd_get_trigger_type(irq_get_irq_data(hw->irq));
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switch (irq_type) {
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case IRQF_TRIGGER_HIGH:
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case IRQF_TRIGGER_RISING:
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break;
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case IRQF_TRIGGER_LOW:
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case IRQF_TRIGGER_FALLING:
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irq_active_low = true;
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break;
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default:
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dev_info(hw->dev,
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"mode %lx unsupported, using IRQF_TRIGGER_RISING\n",
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irq_type);
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irq_type = IRQF_TRIGGER_RISING;
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break;
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}
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err = regmap_update_bits(hw->regmap, HTS221_REG_DRDY_HL_ADDR,
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HTS221_REG_DRDY_HL_MASK,
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FIELD_PREP(HTS221_REG_DRDY_HL_MASK,
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irq_active_low));
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if (err < 0)
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return err;
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if (device_property_read_bool(hw->dev, "drive-open-drain") ||
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(pdata && pdata->open_drain)) {
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irq_type |= IRQF_SHARED;
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open_drain = true;
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}
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err = regmap_update_bits(hw->regmap, HTS221_REG_DRDY_PP_OD_ADDR,
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HTS221_REG_DRDY_PP_OD_MASK,
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FIELD_PREP(HTS221_REG_DRDY_PP_OD_MASK,
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open_drain));
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if (err < 0)
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return err;
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err = devm_request_threaded_irq(hw->dev, hw->irq, NULL,
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hts221_trigger_handler_thread,
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irq_type | IRQF_ONESHOT,
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hw->name, hw);
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if (err) {
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dev_err(hw->dev, "failed to request trigger irq %d\n",
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hw->irq);
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return err;
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}
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hw->trig = devm_iio_trigger_alloc(hw->dev, "%s-trigger",
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iio_dev->name);
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if (!hw->trig)
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return -ENOMEM;
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iio_trigger_set_drvdata(hw->trig, iio_dev);
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hw->trig->ops = &hts221_trigger_ops;
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hw->trig->dev.parent = hw->dev;
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iio_dev->trig = iio_trigger_get(hw->trig);
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return devm_iio_trigger_register(hw->dev, hw->trig);
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}
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static int hts221_buffer_preenable(struct iio_dev *iio_dev)
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{
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return hts221_set_enable(iio_priv(iio_dev), true);
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}
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static int hts221_buffer_postdisable(struct iio_dev *iio_dev)
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{
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return hts221_set_enable(iio_priv(iio_dev), false);
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}
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static const struct iio_buffer_setup_ops hts221_buffer_ops = {
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.preenable = hts221_buffer_preenable,
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.postdisable = hts221_buffer_postdisable,
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};
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static irqreturn_t hts221_buffer_handler_thread(int irq, void *p)
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{
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struct iio_poll_func *pf = p;
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struct iio_dev *iio_dev = pf->indio_dev;
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struct hts221_hw *hw = iio_priv(iio_dev);
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struct iio_chan_spec const *ch;
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int err;
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/* humidity data */
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ch = &iio_dev->channels[HTS221_SENSOR_H];
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err = regmap_bulk_read(hw->regmap, ch->address,
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&hw->scan.channels[0],
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sizeof(hw->scan.channels[0]));
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if (err < 0)
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goto out;
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/* temperature data */
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ch = &iio_dev->channels[HTS221_SENSOR_T];
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err = regmap_bulk_read(hw->regmap, ch->address,
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&hw->scan.channels[1],
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sizeof(hw->scan.channels[1]));
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if (err < 0)
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goto out;
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iio_push_to_buffers_with_timestamp(iio_dev, &hw->scan,
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iio_get_time_ns(iio_dev));
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out:
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iio_trigger_notify_done(hw->trig);
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return IRQ_HANDLED;
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}
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int hts221_allocate_buffers(struct iio_dev *iio_dev)
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{
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struct hts221_hw *hw = iio_priv(iio_dev);
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return devm_iio_triggered_buffer_setup(hw->dev, iio_dev,
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NULL, hts221_buffer_handler_thread,
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&hts221_buffer_ops);
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}
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MODULE_AUTHOR("Lorenzo Bianconi <lorenzo.bianconi@st.com>");
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MODULE_DESCRIPTION("STMicroelectronics hts221 buffer driver");
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MODULE_LICENSE("GPL v2");
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