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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Sensirion SCD30 carbon dioxide sensor core driver
- *
- * Copyright (c) 2020 Tomasz Duszynski <tomasz.duszynski@octakon.com>
- */
- #include <linux/bits.h>
- #include <linux/completion.h>
- #include <linux/delay.h>
- #include <linux/device.h>
- #include <linux/errno.h>
- #include <linux/export.h>
- #include <linux/iio/buffer.h>
- #include <linux/iio/iio.h>
- #include <linux/iio/sysfs.h>
- #include <linux/iio/trigger.h>
- #include <linux/iio/trigger_consumer.h>
- #include <linux/iio/triggered_buffer.h>
- #include <linux/iio/types.h>
- #include <linux/interrupt.h>
- #include <linux/irqreturn.h>
- #include <linux/jiffies.h>
- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/mutex.h>
- #include <linux/regulator/consumer.h>
- #include <linux/string.h>
- #include <linux/sysfs.h>
- #include <linux/types.h>
- #include <asm/byteorder.h>
- #include "scd30.h"
- #define SCD30_PRESSURE_COMP_MIN_MBAR 700
- #define SCD30_PRESSURE_COMP_MAX_MBAR 1400
- #define SCD30_PRESSURE_COMP_DEFAULT 1013
- #define SCD30_MEAS_INTERVAL_MIN_S 2
- #define SCD30_MEAS_INTERVAL_MAX_S 1800
- #define SCD30_MEAS_INTERVAL_DEFAULT SCD30_MEAS_INTERVAL_MIN_S
- #define SCD30_FRC_MIN_PPM 400
- #define SCD30_FRC_MAX_PPM 2000
- #define SCD30_TEMP_OFFSET_MAX 655360
- #define SCD30_EXTRA_TIMEOUT_PER_S 250
- enum {
- SCD30_CONC,
- SCD30_TEMP,
- SCD30_HR,
- };
- static int scd30_command_write(struct scd30_state *state, enum scd30_cmd cmd, u16 arg)
- {
- return state->command(state, cmd, arg, NULL, 0);
- }
- static int scd30_command_read(struct scd30_state *state, enum scd30_cmd cmd, u16 *val)
- {
- __be16 tmp;
- int ret;
- ret = state->command(state, cmd, 0, &tmp, sizeof(tmp));
- *val = be16_to_cpup(&tmp);
- return ret;
- }
- static int scd30_reset(struct scd30_state *state)
- {
- int ret;
- u16 val;
- ret = scd30_command_write(state, CMD_RESET, 0);
- if (ret)
- return ret;
- /* sensor boots up within 2 secs */
- msleep(2000);
- /*
- * Power-on-reset causes sensor to produce some glitch on i2c bus and
- * some controllers end up in error state. Try to recover by placing
- * any data on the bus.
- */
- scd30_command_read(state, CMD_MEAS_READY, &val);
- return 0;
- }
- /* simplified float to fixed point conversion with a scaling factor of 0.01 */
- static int scd30_float_to_fp(int float32)
- {
- int fraction, shift,
- mantissa = float32 & GENMASK(22, 0),
- sign = (float32 & BIT(31)) ? -1 : 1,
- exp = (float32 & ~BIT(31)) >> 23;
- /* special case 0 */
- if (!exp && !mantissa)
- return 0;
- exp -= 127;
- if (exp < 0) {
- exp = -exp;
- /* return values ranging from 1 to 99 */
- return sign * ((((BIT(23) + mantissa) * 100) >> 23) >> exp);
- }
- /* return values starting at 100 */
- shift = 23 - exp;
- float32 = BIT(exp) + (mantissa >> shift);
- fraction = mantissa & GENMASK(shift - 1, 0);
- return sign * (float32 * 100 + ((fraction * 100) >> shift));
- }
- static int scd30_read_meas(struct scd30_state *state)
- {
- int i, ret;
- ret = state->command(state, CMD_READ_MEAS, 0, state->meas, sizeof(state->meas));
- if (ret)
- return ret;
- be32_to_cpu_array(state->meas, (__be32 *)state->meas, ARRAY_SIZE(state->meas));
- for (i = 0; i < ARRAY_SIZE(state->meas); i++)
- state->meas[i] = scd30_float_to_fp(state->meas[i]);
- /*
- * co2 is left unprocessed while temperature and humidity are scaled
- * to milli deg C and milli percent respectively.
- */
- state->meas[SCD30_TEMP] *= 10;
- state->meas[SCD30_HR] *= 10;
- return 0;
- }
- static int scd30_wait_meas_irq(struct scd30_state *state)
- {
- int ret, timeout;
- reinit_completion(&state->meas_ready);
- enable_irq(state->irq);
- timeout = msecs_to_jiffies(state->meas_interval * (1000 + SCD30_EXTRA_TIMEOUT_PER_S));
- ret = wait_for_completion_interruptible_timeout(&state->meas_ready, timeout);
- if (ret > 0)
- ret = 0;
- else if (!ret)
- ret = -ETIMEDOUT;
- disable_irq(state->irq);
- return ret;
- }
- static int scd30_wait_meas_poll(struct scd30_state *state)
- {
- int timeout = state->meas_interval * SCD30_EXTRA_TIMEOUT_PER_S, tries = 5;
- do {
- int ret;
- u16 val;
- ret = scd30_command_read(state, CMD_MEAS_READY, &val);
- if (ret)
- return -EIO;
- /* new measurement available */
- if (val)
- break;
- msleep_interruptible(timeout);
- } while (--tries);
- return tries ? 0 : -ETIMEDOUT;
- }
- static int scd30_read_poll(struct scd30_state *state)
- {
- int ret;
- ret = scd30_wait_meas_poll(state);
- if (ret)
- return ret;
- return scd30_read_meas(state);
- }
- static int scd30_read(struct scd30_state *state)
- {
- if (state->irq > 0)
- return scd30_wait_meas_irq(state);
- return scd30_read_poll(state);
- }
- static int scd30_read_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
- int *val, int *val2, long mask)
- {
- struct scd30_state *state = iio_priv(indio_dev);
- int ret = -EINVAL;
- u16 tmp;
- mutex_lock(&state->lock);
- switch (mask) {
- case IIO_CHAN_INFO_RAW:
- case IIO_CHAN_INFO_PROCESSED:
- if (chan->output) {
- *val = state->pressure_comp;
- ret = IIO_VAL_INT;
- break;
- }
- ret = iio_device_claim_direct_mode(indio_dev);
- if (ret)
- break;
- ret = scd30_read(state);
- if (ret) {
- iio_device_release_direct_mode(indio_dev);
- break;
- }
- *val = state->meas[chan->address];
- iio_device_release_direct_mode(indio_dev);
- ret = IIO_VAL_INT;
- break;
- case IIO_CHAN_INFO_SCALE:
- *val = 0;
- *val2 = 1;
- ret = IIO_VAL_INT_PLUS_MICRO;
- break;
- case IIO_CHAN_INFO_SAMP_FREQ:
- ret = scd30_command_read(state, CMD_MEAS_INTERVAL, &tmp);
- if (ret)
- break;
- *val = 0;
- *val2 = 1000000000 / tmp;
- ret = IIO_VAL_INT_PLUS_NANO;
- break;
- case IIO_CHAN_INFO_CALIBBIAS:
- ret = scd30_command_read(state, CMD_TEMP_OFFSET, &tmp);
- if (ret)
- break;
- *val = tmp;
- ret = IIO_VAL_INT;
- break;
- }
- mutex_unlock(&state->lock);
- return ret;
- }
- static int scd30_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
- int val, int val2, long mask)
- {
- struct scd30_state *state = iio_priv(indio_dev);
- int ret = -EINVAL;
- mutex_lock(&state->lock);
- switch (mask) {
- case IIO_CHAN_INFO_SAMP_FREQ:
- if (val)
- break;
- val = 1000000000 / val2;
- if (val < SCD30_MEAS_INTERVAL_MIN_S || val > SCD30_MEAS_INTERVAL_MAX_S)
- break;
- ret = scd30_command_write(state, CMD_MEAS_INTERVAL, val);
- if (ret)
- break;
- state->meas_interval = val;
- break;
- case IIO_CHAN_INFO_RAW:
- switch (chan->type) {
- case IIO_PRESSURE:
- if (val < SCD30_PRESSURE_COMP_MIN_MBAR ||
- val > SCD30_PRESSURE_COMP_MAX_MBAR)
- break;
- ret = scd30_command_write(state, CMD_START_MEAS, val);
- if (ret)
- break;
- state->pressure_comp = val;
- break;
- default:
- break;
- }
- break;
- case IIO_CHAN_INFO_CALIBBIAS:
- if (val < 0 || val > SCD30_TEMP_OFFSET_MAX)
- break;
- /*
- * Manufacturer does not explicitly specify min/max sensible
- * values hence check is omitted for simplicity.
- */
- ret = scd30_command_write(state, CMD_TEMP_OFFSET / 10, val);
- }
- mutex_unlock(&state->lock);
- return ret;
- }
- static int scd30_write_raw_get_fmt(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
- long mask)
- {
- switch (mask) {
- case IIO_CHAN_INFO_SAMP_FREQ:
- return IIO_VAL_INT_PLUS_NANO;
- case IIO_CHAN_INFO_RAW:
- case IIO_CHAN_INFO_CALIBBIAS:
- return IIO_VAL_INT;
- }
- return -EINVAL;
- }
- static const int scd30_pressure_raw_available[] = {
- SCD30_PRESSURE_COMP_MIN_MBAR, 1, SCD30_PRESSURE_COMP_MAX_MBAR,
- };
- static const int scd30_temp_calibbias_available[] = {
- 0, 10, SCD30_TEMP_OFFSET_MAX,
- };
- static int scd30_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
- const int **vals, int *type, int *length, long mask)
- {
- switch (mask) {
- case IIO_CHAN_INFO_RAW:
- *vals = scd30_pressure_raw_available;
- *type = IIO_VAL_INT;
- return IIO_AVAIL_RANGE;
- case IIO_CHAN_INFO_CALIBBIAS:
- *vals = scd30_temp_calibbias_available;
- *type = IIO_VAL_INT;
- return IIO_AVAIL_RANGE;
- }
- return -EINVAL;
- }
- static ssize_t sampling_frequency_available_show(struct device *dev, struct device_attribute *attr,
- char *buf)
- {
- int i = SCD30_MEAS_INTERVAL_MIN_S;
- ssize_t len = 0;
- do {
- len += scnprintf(buf + len, PAGE_SIZE - len, "0.%09u ", 1000000000 / i);
- /*
- * Not all values fit PAGE_SIZE buffer hence print every 6th
- * (each frequency differs by 6s in time domain from the
- * adjacent). Unlisted but valid ones are still accepted.
- */
- i += 6;
- } while (i <= SCD30_MEAS_INTERVAL_MAX_S);
- buf[len - 1] = '\n';
- return len;
- }
- static ssize_t calibration_auto_enable_show(struct device *dev, struct device_attribute *attr,
- char *buf)
- {
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct scd30_state *state = iio_priv(indio_dev);
- int ret;
- u16 val;
- mutex_lock(&state->lock);
- ret = scd30_command_read(state, CMD_ASC, &val);
- mutex_unlock(&state->lock);
- return ret ?: sprintf(buf, "%d\n", val);
- }
- static ssize_t calibration_auto_enable_store(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t len)
- {
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct scd30_state *state = iio_priv(indio_dev);
- bool val;
- int ret;
- ret = kstrtobool(buf, &val);
- if (ret)
- return ret;
- mutex_lock(&state->lock);
- ret = scd30_command_write(state, CMD_ASC, val);
- mutex_unlock(&state->lock);
- return ret ?: len;
- }
- static ssize_t calibration_forced_value_show(struct device *dev, struct device_attribute *attr,
- char *buf)
- {
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct scd30_state *state = iio_priv(indio_dev);
- int ret;
- u16 val;
- mutex_lock(&state->lock);
- ret = scd30_command_read(state, CMD_FRC, &val);
- mutex_unlock(&state->lock);
- return ret ?: sprintf(buf, "%d\n", val);
- }
- static ssize_t calibration_forced_value_store(struct device *dev, struct device_attribute *attr,
- const char *buf, size_t len)
- {
- struct iio_dev *indio_dev = dev_to_iio_dev(dev);
- struct scd30_state *state = iio_priv(indio_dev);
- int ret;
- u16 val;
- ret = kstrtou16(buf, 0, &val);
- if (ret)
- return ret;
- if (val < SCD30_FRC_MIN_PPM || val > SCD30_FRC_MAX_PPM)
- return -EINVAL;
- mutex_lock(&state->lock);
- ret = scd30_command_write(state, CMD_FRC, val);
- mutex_unlock(&state->lock);
- return ret ?: len;
- }
- static IIO_DEVICE_ATTR_RO(sampling_frequency_available, 0);
- static IIO_DEVICE_ATTR_RW(calibration_auto_enable, 0);
- static IIO_DEVICE_ATTR_RW(calibration_forced_value, 0);
- static struct attribute *scd30_attrs[] = {
- &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
- &iio_dev_attr_calibration_auto_enable.dev_attr.attr,
- &iio_dev_attr_calibration_forced_value.dev_attr.attr,
- NULL
- };
- static const struct attribute_group scd30_attr_group = {
- .attrs = scd30_attrs,
- };
- static const struct iio_info scd30_info = {
- .attrs = &scd30_attr_group,
- .read_raw = scd30_read_raw,
- .write_raw = scd30_write_raw,
- .write_raw_get_fmt = scd30_write_raw_get_fmt,
- .read_avail = scd30_read_avail,
- };
- #define SCD30_CHAN_SCAN_TYPE(_sign, _realbits) .scan_type = { \
- .sign = _sign, \
- .realbits = _realbits, \
- .storagebits = 32, \
- .endianness = IIO_CPU, \
- }
- static const struct iio_chan_spec scd30_channels[] = {
- {
- /*
- * this channel is special in a sense we are pretending that
- * sensor is able to change measurement chamber pressure but in
- * fact we're just setting pressure compensation value
- */
- .type = IIO_PRESSURE,
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
- .info_mask_separate_available = BIT(IIO_CHAN_INFO_RAW),
- .output = 1,
- .scan_index = -1,
- },
- {
- .type = IIO_CONCENTRATION,
- .channel2 = IIO_MOD_CO2,
- .address = SCD30_CONC,
- .scan_index = SCD30_CONC,
- .info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
- BIT(IIO_CHAN_INFO_SCALE),
- .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
- .modified = 1,
- SCD30_CHAN_SCAN_TYPE('u', 20),
- },
- {
- .type = IIO_TEMP,
- .address = SCD30_TEMP,
- .scan_index = SCD30_TEMP,
- .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
- BIT(IIO_CHAN_INFO_CALIBBIAS),
- .info_mask_separate_available = BIT(IIO_CHAN_INFO_CALIBBIAS),
- .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
- SCD30_CHAN_SCAN_TYPE('s', 18),
- },
- {
- .type = IIO_HUMIDITYRELATIVE,
- .address = SCD30_HR,
- .scan_index = SCD30_HR,
- .info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED),
- .info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
- SCD30_CHAN_SCAN_TYPE('u', 17),
- },
- IIO_CHAN_SOFT_TIMESTAMP(3),
- };
- int __maybe_unused scd30_suspend(struct device *dev)
- {
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct scd30_state *state = iio_priv(indio_dev);
- int ret;
- ret = scd30_command_write(state, CMD_STOP_MEAS, 0);
- if (ret)
- return ret;
- return regulator_disable(state->vdd);
- }
- EXPORT_SYMBOL(scd30_suspend);
- int __maybe_unused scd30_resume(struct device *dev)
- {
- struct iio_dev *indio_dev = dev_get_drvdata(dev);
- struct scd30_state *state = iio_priv(indio_dev);
- int ret;
- ret = regulator_enable(state->vdd);
- if (ret)
- return ret;
- return scd30_command_write(state, CMD_START_MEAS, state->pressure_comp);
- }
- EXPORT_SYMBOL(scd30_resume);
- static void scd30_stop_meas(void *data)
- {
- struct scd30_state *state = data;
- scd30_command_write(state, CMD_STOP_MEAS, 0);
- }
- static void scd30_disable_regulator(void *data)
- {
- struct scd30_state *state = data;
- regulator_disable(state->vdd);
- }
- static irqreturn_t scd30_irq_handler(int irq, void *priv)
- {
- struct iio_dev *indio_dev = priv;
- if (iio_buffer_enabled(indio_dev)) {
- iio_trigger_poll(indio_dev->trig);
- return IRQ_HANDLED;
- }
- return IRQ_WAKE_THREAD;
- }
- static irqreturn_t scd30_irq_thread_handler(int irq, void *priv)
- {
- struct iio_dev *indio_dev = priv;
- struct scd30_state *state = iio_priv(indio_dev);
- int ret;
- ret = scd30_read_meas(state);
- if (ret)
- goto out;
- complete_all(&state->meas_ready);
- out:
- return IRQ_HANDLED;
- }
- static irqreturn_t scd30_trigger_handler(int irq, void *p)
- {
- struct iio_poll_func *pf = p;
- struct iio_dev *indio_dev = pf->indio_dev;
- struct scd30_state *state = iio_priv(indio_dev);
- struct {
- int data[SCD30_MEAS_COUNT];
- s64 ts __aligned(8);
- } scan;
- int ret;
- mutex_lock(&state->lock);
- if (!iio_trigger_using_own(indio_dev))
- ret = scd30_read_poll(state);
- else
- ret = scd30_read_meas(state);
- memset(&scan, 0, sizeof(scan));
- memcpy(scan.data, state->meas, sizeof(state->meas));
- mutex_unlock(&state->lock);
- if (ret)
- goto out;
- iio_push_to_buffers_with_timestamp(indio_dev, &scan, iio_get_time_ns(indio_dev));
- out:
- iio_trigger_notify_done(indio_dev->trig);
- return IRQ_HANDLED;
- }
- static int scd30_set_trigger_state(struct iio_trigger *trig, bool state)
- {
- struct iio_dev *indio_dev = iio_trigger_get_drvdata(trig);
- struct scd30_state *st = iio_priv(indio_dev);
- if (state)
- enable_irq(st->irq);
- else
- disable_irq(st->irq);
- return 0;
- }
- static const struct iio_trigger_ops scd30_trigger_ops = {
- .set_trigger_state = scd30_set_trigger_state,
- .validate_device = iio_trigger_validate_own_device,
- };
- static int scd30_setup_trigger(struct iio_dev *indio_dev)
- {
- struct scd30_state *state = iio_priv(indio_dev);
- struct device *dev = indio_dev->dev.parent;
- struct iio_trigger *trig;
- int ret;
- trig = devm_iio_trigger_alloc(dev, "%s-dev%d", indio_dev->name, indio_dev->id);
- if (!trig) {
- dev_err(dev, "failed to allocate trigger\n");
- return -ENOMEM;
- }
- trig->dev.parent = dev;
- trig->ops = &scd30_trigger_ops;
- iio_trigger_set_drvdata(trig, indio_dev);
- ret = devm_iio_trigger_register(dev, trig);
- if (ret)
- return ret;
- indio_dev->trig = iio_trigger_get(trig);
- ret = devm_request_threaded_irq(dev, state->irq, scd30_irq_handler,
- scd30_irq_thread_handler, IRQF_TRIGGER_HIGH | IRQF_ONESHOT,
- indio_dev->name, indio_dev);
- if (ret)
- dev_err(dev, "failed to request irq\n");
- /*
- * Interrupt is enabled just before taking a fresh measurement
- * and disabled afterwards. This means we need to disable it here
- * to keep calls to enable/disable balanced.
- */
- disable_irq(state->irq);
- return ret;
- }
- int scd30_probe(struct device *dev, int irq, const char *name, void *priv,
- scd30_command_t command)
- {
- static const unsigned long scd30_scan_masks[] = { 0x07, 0x00 };
- struct scd30_state *state;
- struct iio_dev *indio_dev;
- int ret;
- u16 val;
- indio_dev = devm_iio_device_alloc(dev, sizeof(*state));
- if (!indio_dev)
- return -ENOMEM;
- state = iio_priv(indio_dev);
- state->dev = dev;
- state->priv = priv;
- state->irq = irq;
- state->pressure_comp = SCD30_PRESSURE_COMP_DEFAULT;
- state->meas_interval = SCD30_MEAS_INTERVAL_DEFAULT;
- state->command = command;
- mutex_init(&state->lock);
- init_completion(&state->meas_ready);
- dev_set_drvdata(dev, indio_dev);
- indio_dev->info = &scd30_info;
- indio_dev->name = name;
- indio_dev->channels = scd30_channels;
- indio_dev->num_channels = ARRAY_SIZE(scd30_channels);
- indio_dev->modes = INDIO_DIRECT_MODE;
- indio_dev->available_scan_masks = scd30_scan_masks;
- state->vdd = devm_regulator_get(dev, "vdd");
- if (IS_ERR(state->vdd))
- return dev_err_probe(dev, PTR_ERR(state->vdd), "failed to get regulator\n");
- ret = regulator_enable(state->vdd);
- if (ret)
- return ret;
- ret = devm_add_action_or_reset(dev, scd30_disable_regulator, state);
- if (ret)
- return ret;
- ret = scd30_reset(state);
- if (ret) {
- dev_err(dev, "failed to reset device: %d\n", ret);
- return ret;
- }
- if (state->irq > 0) {
- ret = scd30_setup_trigger(indio_dev);
- if (ret) {
- dev_err(dev, "failed to setup trigger: %d\n", ret);
- return ret;
- }
- }
- ret = devm_iio_triggered_buffer_setup(dev, indio_dev, NULL, scd30_trigger_handler, NULL);
- if (ret)
- return ret;
- ret = scd30_command_read(state, CMD_FW_VERSION, &val);
- if (ret) {
- dev_err(dev, "failed to read firmware version: %d\n", ret);
- return ret;
- }
- dev_info(dev, "firmware version: %d.%d\n", val >> 8, (char)val);
- ret = scd30_command_write(state, CMD_MEAS_INTERVAL, state->meas_interval);
- if (ret) {
- dev_err(dev, "failed to set measurement interval: %d\n", ret);
- return ret;
- }
- ret = scd30_command_write(state, CMD_START_MEAS, state->pressure_comp);
- if (ret) {
- dev_err(dev, "failed to start measurement: %d\n", ret);
- return ret;
- }
- ret = devm_add_action_or_reset(dev, scd30_stop_meas, state);
- if (ret)
- return ret;
- return devm_iio_device_register(dev, indio_dev);
- }
- EXPORT_SYMBOL(scd30_probe);
- MODULE_AUTHOR("Tomasz Duszynski <tomasz.duszynski@octakon.com>");
- MODULE_DESCRIPTION("Sensirion SCD30 carbon dioxide sensor core driver");
- MODULE_LICENSE("GPL v2");
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