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766 lines
18 KiB
766 lines
18 KiB
// 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 <[email protected]> |
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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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|
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#include "scd30.h" |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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return 0; |
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} |
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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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|
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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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|
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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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|
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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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|
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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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|
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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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/* |
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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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|
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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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|
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return ret; |
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} |
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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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|
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do { |
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int ret; |
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u16 val; |
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|
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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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|
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/* new measurement available */ |
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if (val) |
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break; |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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), |
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), |
|
|
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SCD30_CHAN_SCAN_TYPE('s', 18), |
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}, |
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{ |
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.type = IIO_HUMIDITYRELATIVE, |
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.address = SCD30_HR, |
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.scan_index = SCD30_HR, |
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.info_mask_separate = BIT(IIO_CHAN_INFO_PROCESSED), |
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.info_mask_shared_by_all = BIT(IIO_CHAN_INFO_SAMP_FREQ), |
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|
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SCD30_CHAN_SCAN_TYPE('u', 17), |
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}, |
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IIO_CHAN_SOFT_TIMESTAMP(3), |
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}; |
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|
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int __maybe_unused scd30_suspend(struct device *dev) |
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{ |
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struct iio_dev *indio_dev = dev_get_drvdata(dev); |
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struct scd30_state *state = iio_priv(indio_dev); |
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int ret; |
|
|
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ret = scd30_command_write(state, CMD_STOP_MEAS, 0); |
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if (ret) |
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return ret; |
|
|
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return regulator_disable(state->vdd); |
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} |
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EXPORT_SYMBOL(scd30_suspend); |
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|
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int __maybe_unused scd30_resume(struct device *dev) |
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{ |
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struct iio_dev *indio_dev = dev_get_drvdata(dev); |
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struct scd30_state *state = iio_priv(indio_dev); |
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int ret; |
|
|
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ret = regulator_enable(state->vdd); |
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if (ret) |
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return ret; |
|
|
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return scd30_command_write(state, CMD_START_MEAS, state->pressure_comp); |
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} |
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EXPORT_SYMBOL(scd30_resume); |
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|
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static void scd30_stop_meas(void *data) |
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{ |
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struct scd30_state *state = data; |
|
|
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scd30_command_write(state, CMD_STOP_MEAS, 0); |
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} |
|
|
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static void scd30_disable_regulator(void *data) |
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{ |
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struct scd30_state *state = data; |
|
|
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regulator_disable(state->vdd); |
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} |
|
|
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static irqreturn_t scd30_irq_handler(int irq, void *priv) |
|
{ |
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struct iio_dev *indio_dev = priv; |
|
|
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if (iio_buffer_enabled(indio_dev)) { |
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iio_trigger_poll(indio_dev->trig); |
|
|
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return IRQ_HANDLED; |
|
} |
|
|
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return IRQ_WAKE_THREAD; |
|
} |
|
|
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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 <[email protected]>"); |
|
MODULE_DESCRIPTION("Sensirion SCD30 carbon dioxide sensor core driver"); |
|
MODULE_LICENSE("GPL v2");
|
|
|