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![Jonathan Cameron](/assets/img/avatar_default.png)
This new flag cleanly avoids the need for a dance where we request the interrupt only to immediately disabling it by ensuring it is not auto-enabled in the first place. Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> Cc: Tomasz Duszynski <tomasz.duszynski@octakon.com> Reviewed-by: Barry Song <song.bao.hua@hisilicon.com> Reviewed-by: Andy Shevchenko <andy.shevchenko@gmail.com> Reviewed-by: Lars-Peter Clausen <lars@metafoo.de> Link: https://lore.kernel.org/r/20210402184544.488862-6-jic23@kernel.org
765 lines
18 KiB
C
765 lines
18 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Sensirion SCD30 carbon dioxide sensor core driver
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*
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* Copyright (c) 2020 Tomasz Duszynski <tomasz.duszynski@octakon.com>
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*/
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#include <linux/bits.h>
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#include <linux/completion.h>
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#include <linux/delay.h>
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#include <linux/device.h>
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#include <linux/errno.h>
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#include <linux/export.h>
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#include <linux/iio/buffer.h>
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#include <linux/iio/iio.h>
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#include <linux/iio/sysfs.h>
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#include <linux/iio/trigger.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/types.h>
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#include <linux/interrupt.h>
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#include <linux/irqreturn.h>
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#include <linux/jiffies.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mutex.h>
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#include <linux/regulator/consumer.h>
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#include <linux/string.h>
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#include <linux/sysfs.h>
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#include <linux/types.h>
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#include <asm/byteorder.h>
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#include "scd30.h"
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#define SCD30_PRESSURE_COMP_MIN_MBAR 700
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#define SCD30_PRESSURE_COMP_MAX_MBAR 1400
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#define SCD30_PRESSURE_COMP_DEFAULT 1013
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#define SCD30_MEAS_INTERVAL_MIN_S 2
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#define SCD30_MEAS_INTERVAL_MAX_S 1800
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#define SCD30_MEAS_INTERVAL_DEFAULT SCD30_MEAS_INTERVAL_MIN_S
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#define SCD30_FRC_MIN_PPM 400
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#define SCD30_FRC_MAX_PPM 2000
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#define SCD30_TEMP_OFFSET_MAX 655360
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#define SCD30_EXTRA_TIMEOUT_PER_S 250
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enum {
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SCD30_CONC,
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SCD30_TEMP,
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SCD30_HR,
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};
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static int scd30_command_write(struct scd30_state *state, enum scd30_cmd cmd, u16 arg)
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{
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return state->command(state, cmd, arg, NULL, 0);
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}
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static int scd30_command_read(struct scd30_state *state, enum scd30_cmd cmd, u16 *val)
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{
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__be16 tmp;
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int ret;
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ret = state->command(state, cmd, 0, &tmp, sizeof(tmp));
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*val = be16_to_cpup(&tmp);
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return ret;
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}
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static int scd30_reset(struct scd30_state *state)
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{
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int ret;
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u16 val;
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ret = scd30_command_write(state, CMD_RESET, 0);
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if (ret)
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return ret;
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/* sensor boots up within 2 secs */
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msleep(2000);
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/*
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* Power-on-reset causes sensor to produce some glitch on i2c bus and
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* some controllers end up in error state. Try to recover by placing
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* any data on the bus.
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*/
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scd30_command_read(state, CMD_MEAS_READY, &val);
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return 0;
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}
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/* simplified float to fixed point conversion with a scaling factor of 0.01 */
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static int scd30_float_to_fp(int float32)
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{
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int fraction, shift,
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mantissa = float32 & GENMASK(22, 0),
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sign = (float32 & BIT(31)) ? -1 : 1,
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exp = (float32 & ~BIT(31)) >> 23;
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/* special case 0 */
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if (!exp && !mantissa)
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return 0;
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exp -= 127;
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if (exp < 0) {
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exp = -exp;
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/* return values ranging from 1 to 99 */
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return sign * ((((BIT(23) + mantissa) * 100) >> 23) >> exp);
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}
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/* return values starting at 100 */
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shift = 23 - exp;
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float32 = BIT(exp) + (mantissa >> shift);
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fraction = mantissa & GENMASK(shift - 1, 0);
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return sign * (float32 * 100 + ((fraction * 100) >> shift));
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}
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static int scd30_read_meas(struct scd30_state *state)
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{
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int i, ret;
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ret = state->command(state, CMD_READ_MEAS, 0, state->meas, sizeof(state->meas));
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if (ret)
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return ret;
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be32_to_cpu_array(state->meas, (__be32 *)state->meas, ARRAY_SIZE(state->meas));
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for (i = 0; i < ARRAY_SIZE(state->meas); i++)
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state->meas[i] = scd30_float_to_fp(state->meas[i]);
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/*
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* co2 is left unprocessed while temperature and humidity are scaled
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* to milli deg C and milli percent respectively.
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*/
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state->meas[SCD30_TEMP] *= 10;
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state->meas[SCD30_HR] *= 10;
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return 0;
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}
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static int scd30_wait_meas_irq(struct scd30_state *state)
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{
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int ret, timeout;
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reinit_completion(&state->meas_ready);
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enable_irq(state->irq);
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timeout = msecs_to_jiffies(state->meas_interval * (1000 + SCD30_EXTRA_TIMEOUT_PER_S));
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ret = wait_for_completion_interruptible_timeout(&state->meas_ready, timeout);
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if (ret > 0)
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ret = 0;
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else if (!ret)
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ret = -ETIMEDOUT;
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disable_irq(state->irq);
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return ret;
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}
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static int scd30_wait_meas_poll(struct scd30_state *state)
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{
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int timeout = state->meas_interval * SCD30_EXTRA_TIMEOUT_PER_S, tries = 5;
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do {
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int ret;
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u16 val;
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ret = scd30_command_read(state, CMD_MEAS_READY, &val);
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if (ret)
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return -EIO;
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/* new measurement available */
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if (val)
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break;
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msleep_interruptible(timeout);
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} while (--tries);
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return tries ? 0 : -ETIMEDOUT;
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}
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static int scd30_read_poll(struct scd30_state *state)
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{
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int ret;
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ret = scd30_wait_meas_poll(state);
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if (ret)
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return ret;
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return scd30_read_meas(state);
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}
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static int scd30_read(struct scd30_state *state)
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{
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if (state->irq > 0)
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return scd30_wait_meas_irq(state);
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return scd30_read_poll(state);
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}
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static int scd30_read_raw(struct iio_dev *indio_dev, 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 scd30_state *state = iio_priv(indio_dev);
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int ret = -EINVAL;
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u16 tmp;
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mutex_lock(&state->lock);
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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case IIO_CHAN_INFO_PROCESSED:
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if (chan->output) {
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*val = state->pressure_comp;
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ret = IIO_VAL_INT;
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break;
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}
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ret = iio_device_claim_direct_mode(indio_dev);
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if (ret)
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break;
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ret = scd30_read(state);
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if (ret) {
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iio_device_release_direct_mode(indio_dev);
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break;
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}
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*val = state->meas[chan->address];
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iio_device_release_direct_mode(indio_dev);
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ret = IIO_VAL_INT;
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break;
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case IIO_CHAN_INFO_SCALE:
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*val = 0;
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*val2 = 1;
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ret = IIO_VAL_INT_PLUS_MICRO;
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break;
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case IIO_CHAN_INFO_SAMP_FREQ:
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ret = scd30_command_read(state, CMD_MEAS_INTERVAL, &tmp);
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if (ret)
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break;
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*val = 0;
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*val2 = 1000000000 / tmp;
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ret = IIO_VAL_INT_PLUS_NANO;
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break;
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case IIO_CHAN_INFO_CALIBBIAS:
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ret = scd30_command_read(state, CMD_TEMP_OFFSET, &tmp);
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if (ret)
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break;
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*val = tmp;
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ret = IIO_VAL_INT;
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break;
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}
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mutex_unlock(&state->lock);
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return ret;
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}
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static int scd30_write_raw(struct iio_dev *indio_dev, 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 scd30_state *state = iio_priv(indio_dev);
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int ret = -EINVAL;
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mutex_lock(&state->lock);
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switch (mask) {
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case IIO_CHAN_INFO_SAMP_FREQ:
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if (val)
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break;
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val = 1000000000 / val2;
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if (val < SCD30_MEAS_INTERVAL_MIN_S || val > SCD30_MEAS_INTERVAL_MAX_S)
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break;
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ret = scd30_command_write(state, CMD_MEAS_INTERVAL, val);
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if (ret)
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break;
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state->meas_interval = val;
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break;
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case IIO_CHAN_INFO_RAW:
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switch (chan->type) {
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case IIO_PRESSURE:
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if (val < SCD30_PRESSURE_COMP_MIN_MBAR ||
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val > SCD30_PRESSURE_COMP_MAX_MBAR)
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break;
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ret = scd30_command_write(state, CMD_START_MEAS, val);
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if (ret)
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break;
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state->pressure_comp = val;
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break;
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default:
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break;
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}
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break;
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case IIO_CHAN_INFO_CALIBBIAS:
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if (val < 0 || val > SCD30_TEMP_OFFSET_MAX)
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break;
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/*
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* Manufacturer does not explicitly specify min/max sensible
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* values hence check is omitted for simplicity.
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*/
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ret = scd30_command_write(state, CMD_TEMP_OFFSET / 10, val);
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}
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mutex_unlock(&state->lock);
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return ret;
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}
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static int scd30_write_raw_get_fmt(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
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long mask)
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{
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switch (mask) {
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case IIO_CHAN_INFO_SAMP_FREQ:
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return IIO_VAL_INT_PLUS_NANO;
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case IIO_CHAN_INFO_RAW:
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case IIO_CHAN_INFO_CALIBBIAS:
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return IIO_VAL_INT;
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}
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return -EINVAL;
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}
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static const int scd30_pressure_raw_available[] = {
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SCD30_PRESSURE_COMP_MIN_MBAR, 1, SCD30_PRESSURE_COMP_MAX_MBAR,
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};
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static const int scd30_temp_calibbias_available[] = {
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0, 10, SCD30_TEMP_OFFSET_MAX,
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};
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static int scd30_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan,
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const int **vals, int *type, int *length, long mask)
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{
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switch (mask) {
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case IIO_CHAN_INFO_RAW:
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*vals = scd30_pressure_raw_available;
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*type = IIO_VAL_INT;
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return IIO_AVAIL_RANGE;
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case IIO_CHAN_INFO_CALIBBIAS:
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*vals = scd30_temp_calibbias_available;
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*type = IIO_VAL_INT;
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return IIO_AVAIL_RANGE;
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}
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return -EINVAL;
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}
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static ssize_t sampling_frequency_available_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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int i = SCD30_MEAS_INTERVAL_MIN_S;
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ssize_t len = 0;
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do {
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len += scnprintf(buf + len, PAGE_SIZE - len, "0.%09u ", 1000000000 / i);
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/*
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* Not all values fit PAGE_SIZE buffer hence print every 6th
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* (each frequency differs by 6s in time domain from the
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* adjacent). Unlisted but valid ones are still accepted.
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*/
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i += 6;
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} while (i <= SCD30_MEAS_INTERVAL_MAX_S);
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buf[len - 1] = '\n';
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return len;
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}
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static ssize_t calibration_auto_enable_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct scd30_state *state = iio_priv(indio_dev);
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int ret;
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u16 val;
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mutex_lock(&state->lock);
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ret = scd30_command_read(state, CMD_ASC, &val);
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mutex_unlock(&state->lock);
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return ret ?: sprintf(buf, "%d\n", val);
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}
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static ssize_t calibration_auto_enable_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct scd30_state *state = iio_priv(indio_dev);
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bool val;
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int ret;
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ret = kstrtobool(buf, &val);
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if (ret)
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return ret;
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mutex_lock(&state->lock);
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ret = scd30_command_write(state, CMD_ASC, val);
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mutex_unlock(&state->lock);
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return ret ?: len;
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}
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static ssize_t calibration_forced_value_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct scd30_state *state = iio_priv(indio_dev);
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int ret;
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u16 val;
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mutex_lock(&state->lock);
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ret = scd30_command_read(state, CMD_FRC, &val);
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mutex_unlock(&state->lock);
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return ret ?: sprintf(buf, "%d\n", val);
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}
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static ssize_t calibration_forced_value_store(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t len)
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{
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struct iio_dev *indio_dev = dev_to_iio_dev(dev);
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struct scd30_state *state = iio_priv(indio_dev);
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int ret;
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u16 val;
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ret = kstrtou16(buf, 0, &val);
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if (ret)
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return ret;
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if (val < SCD30_FRC_MIN_PPM || val > SCD30_FRC_MAX_PPM)
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return -EINVAL;
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mutex_lock(&state->lock);
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ret = scd30_command_write(state, CMD_FRC, val);
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mutex_unlock(&state->lock);
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return ret ?: len;
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}
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static IIO_DEVICE_ATTR_RO(sampling_frequency_available, 0);
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static IIO_DEVICE_ATTR_RW(calibration_auto_enable, 0);
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static IIO_DEVICE_ATTR_RW(calibration_forced_value, 0);
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static struct attribute *scd30_attrs[] = {
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&iio_dev_attr_sampling_frequency_available.dev_attr.attr,
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&iio_dev_attr_calibration_auto_enable.dev_attr.attr,
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&iio_dev_attr_calibration_forced_value.dev_attr.attr,
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NULL
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};
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static const struct attribute_group scd30_attr_group = {
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.attrs = scd30_attrs,
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};
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static const struct iio_info scd30_info = {
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.attrs = &scd30_attr_group,
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.read_raw = scd30_read_raw,
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.write_raw = scd30_write_raw,
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.write_raw_get_fmt = scd30_write_raw_get_fmt,
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.read_avail = scd30_read_avail,
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};
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#define SCD30_CHAN_SCAN_TYPE(_sign, _realbits) .scan_type = { \
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.sign = _sign, \
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.realbits = _realbits, \
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.storagebits = 32, \
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.endianness = IIO_CPU, \
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}
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static const struct iio_chan_spec scd30_channels[] = {
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{
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/*
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* this channel is special in a sense we are pretending that
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* sensor is able to change measurement chamber pressure but in
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* fact we're just setting pressure compensation value
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*/
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.type = IIO_PRESSURE,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
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.info_mask_separate_available = BIT(IIO_CHAN_INFO_RAW),
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.output = 1,
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.scan_index = -1,
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},
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{
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.type = IIO_CONCENTRATION,
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.channel2 = IIO_MOD_CO2,
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.address = SCD30_CONC,
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.scan_index = SCD30_CONC,
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.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) |
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BIT(IIO_CHAN_INFO_SCALE),
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ),
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.modified = 1,
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SCD30_CHAN_SCAN_TYPE('u', 20),
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},
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{
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.type = IIO_TEMP,
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.address = SCD30_TEMP,
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.scan_index = SCD30_TEMP,
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED) |
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BIT(IIO_CHAN_INFO_CALIBBIAS),
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.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->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);
|
|
|
|
/*
|
|
* Interrupt is enabled just before taking a fresh measurement
|
|
* and disabled afterwards. This means we need to ensure it is not
|
|
* enabled here to keep calls to enable/disable balanced.
|
|
*/
|
|
ret = devm_request_threaded_irq(dev, state->irq, scd30_irq_handler,
|
|
scd30_irq_thread_handler,
|
|
IRQF_TRIGGER_HIGH | IRQF_ONESHOT |
|
|
IRQF_NO_AUTOEN,
|
|
indio_dev->name, indio_dev);
|
|
if (ret)
|
|
dev_err(dev, "failed to request irq\n");
|
|
|
|
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");
|