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