1 // SPDX-License-Identifier: GPL-2.0
67 	struct mutex lock;  member
73 static int scd4x_i2c_xfer(struct scd4x_state *state, char *txbuf, int txsize,  in scd4x_i2c_xfer()  argument
76 	struct i2c_client *client = state->client;  in scd4x_i2c_xfer()
84 		return -EIO;  in scd4x_i2c_xfer()
93 		return -EIO;  in scd4x_i2c_xfer()
98 static int scd4x_send_command(struct scd4x_state *state, enum scd4x_cmd cmd)  in scd4x_send_command()  argument
109 		ret = scd4x_send_command(state, CMD_STOP_MEAS);  in scd4x_send_command()
118 	ret = scd4x_i2c_xfer(state, buf, 2, buf, 0);  in scd4x_send_command()
123 		ret = scd4x_send_command(state, CMD_START_MEAS);  in scd4x_send_command()
131 static int scd4x_read(struct scd4x_state *state, enum scd4x_cmd cmd,  in scd4x_read()  argument
134 	struct i2c_client *client = state->client;  in scd4x_read()
146 		ret = scd4x_send_command(state, CMD_STOP_MEAS);  in scd4x_read()
158 	ret = scd4x_i2c_xfer(state, buf, 2, buf, response_sz);  in scd4x_read()
165 			dev_err(&client->dev, "CRC error\n");  in scd4x_read()
166 			return -EIO;  in scd4x_read()
176 		ret = scd4x_send_command(state, CMD_START_MEAS);  in scd4x_read()
184 static int scd4x_write(struct scd4x_state *state, enum scd4x_cmd cmd, uint16_t arg)  in scd4x_write()  argument
198 		ret = scd4x_send_command(state, CMD_STOP_MEAS);  in scd4x_write()
206 	ret = scd4x_i2c_xfer(state, buf, SCD4X_WRITE_BUF_SIZE, buf, 0);  in scd4x_write()
212 		ret = scd4x_send_command(state, CMD_START_MEAS);  in scd4x_write()
220 static int scd4x_write_and_fetch(struct scd4x_state *state, enum scd4x_cmd cmd,  in scd4x_write_and_fetch()  argument
223 	struct i2c_client *client = state->client;  in scd4x_write_and_fetch()
229 	ret = scd4x_write(state, CMD_FRC, arg);  in scd4x_write_and_fetch()
243 		ret = -EIO;  in scd4x_write_and_fetch()
250 			dev_err(&client->dev, "CRC error\n");  in scd4x_write_and_fetch()
251 			ret = -EIO;  in scd4x_write_and_fetch()
259 	return scd4x_send_command(state, CMD_START_MEAS);  in scd4x_write_and_fetch()
266 	scd4x_send_command(state, CMD_START_MEAS);  in scd4x_write_and_fetch()
271 static int scd4x_read_meas(struct scd4x_state *state, uint16_t *meas)  in scd4x_read_meas()  argument
276 	ret = scd4x_read(state, CMD_READ_MEAS, buf, sizeof(buf));  in scd4x_read_meas()
286 static int scd4x_wait_meas_poll(struct scd4x_state *state)  in scd4x_wait_meas_poll()  argument
288 	struct i2c_client *client = state->client;  in scd4x_wait_meas_poll()
296 		ret = scd4x_read(state, CMD_GET_DATA_READY, &bval, sizeof(bval));  in scd4x_wait_meas_poll()
298 			return -EIO;  in scd4x_wait_meas_poll()
306 	} while (--tries);  in scd4x_wait_meas_poll()
309 	ret = scd4x_send_command(state, CMD_START_MEAS);  in scd4x_wait_meas_poll()
311 		dev_err(&client->dev, "failed to start measurement: %d\n", ret);  in scd4x_wait_meas_poll()
313 	return -ETIMEDOUT;  in scd4x_wait_meas_poll()
316 static int scd4x_read_poll(struct scd4x_state *state, uint16_t *buf)  in scd4x_read_poll()  argument
320 	ret = scd4x_wait_meas_poll(state);  in scd4x_read_poll()
324 	return scd4x_read_meas(state, buf);  in scd4x_read_poll()
327 static int scd4x_read_channel(struct scd4x_state *state, int chan)  in scd4x_read_channel()  argument
332 	ret = scd4x_read_poll(state, buf);  in scd4x_read_channel()
343 	struct scd4x_state *state = iio_priv(indio_dev);  in scd4x_read_raw()  local
349 		if (chan->output) {  in scd4x_read_raw()
350 			mutex_lock(&state->lock);  in scd4x_read_raw()
351 			ret = scd4x_read(state, CMD_GET_AMB_PRESSURE, &tmp, sizeof(tmp));  in scd4x_read_raw()
352 			mutex_unlock(&state->lock);  in scd4x_read_raw()
365 		mutex_lock(&state->lock);  in scd4x_read_raw()
366 		ret = scd4x_read_channel(state, chan->address);  in scd4x_read_raw()
367 		mutex_unlock(&state->lock);  in scd4x_read_raw()
376 		if (chan->type == IIO_CONCENTRATION) {  in scd4x_read_raw()
380 		} else if (chan->type == IIO_TEMP) {  in scd4x_read_raw()
384 		} else if (chan->type == IIO_HUMIDITYRELATIVE) {  in scd4x_read_raw()
389 		return -EINVAL;  in scd4x_read_raw()
391 		*val = -16852;  in scd4x_read_raw()
395 		mutex_lock(&state->lock);  in scd4x_read_raw()
396 		ret = scd4x_read(state, CMD_GET_TEMP_OFFSET, &tmp, sizeof(tmp));  in scd4x_read_raw()
397 		mutex_unlock(&state->lock);  in scd4x_read_raw()
405 		return -EINVAL;  in scd4x_read_raw()
424 	return -EINVAL;  in scd4x_read_avail()
431 	struct scd4x_state *state = iio_priv(indio_dev);  in scd4x_write_raw()  local
436 		mutex_lock(&state->lock);  in scd4x_write_raw()
437 		ret = scd4x_write(state, CMD_SET_TEMP_OFFSET, val);  in scd4x_write_raw()
438 		mutex_unlock(&state->lock);  in scd4x_write_raw()
442 		switch (chan->type) {  in scd4x_write_raw()
446 				return -EINVAL;  in scd4x_write_raw()
448 			mutex_lock(&state->lock);  in scd4x_write_raw()
449 			ret = scd4x_write(state, CMD_SET_AMB_PRESSURE, val);  in scd4x_write_raw()
450 			mutex_unlock(&state->lock);  in scd4x_write_raw()
454 			return -EINVAL;  in scd4x_write_raw()
457 		return -EINVAL;  in scd4x_write_raw()
465 	struct scd4x_state *state = iio_priv(indio_dev);  in calibration_auto_enable_show()  local
470 	mutex_lock(&state->lock);  in calibration_auto_enable_show()
471 	ret = scd4x_read(state, CMD_GET_ASC, &bval, sizeof(bval));  in calibration_auto_enable_show()
472 	mutex_unlock(&state->lock);  in calibration_auto_enable_show()
488 	struct scd4x_state *state = iio_priv(indio_dev);  in calibration_auto_enable_store()  local
499 	mutex_lock(&state->lock);  in calibration_auto_enable_store()
500 	ret = scd4x_write(state, CMD_SET_ASC, value);  in calibration_auto_enable_store()
501 	mutex_unlock(&state->lock);  in calibration_auto_enable_store()
513 	struct scd4x_state *state = iio_priv(indio_dev);  in calibration_forced_value_store()  local
522 		return -EINVAL;  in calibration_forced_value_store()
524 	mutex_lock(&state->lock);  in calibration_forced_value_store()
525 	ret = scd4x_write_and_fetch(state, CMD_FRC, arg, &val, sizeof(val));  in calibration_forced_value_store()
526 	mutex_unlock(&state->lock);  in calibration_forced_value_store()
533 		return -EINVAL;  in calibration_forced_value_store()
574 		.scan_index = -1,
624 	struct scd4x_state *state  = iio_priv(indio_dev);  in scd4x_suspend()  local
627 	ret = scd4x_send_command(state, CMD_STOP_MEAS);  in scd4x_suspend()
631 	return regulator_disable(state->vdd);  in scd4x_suspend()
637 	struct scd4x_state *state = iio_priv(indio_dev);  in scd4x_resume()  local
640 	ret = regulator_enable(state->vdd);  in scd4x_resume()
644 	return scd4x_send_command(state, CMD_START_MEAS);  in scd4x_resume()
649 static void scd4x_stop_meas(void *state)  in scd4x_stop_meas()  argument
651 	scd4x_send_command(state, CMD_STOP_MEAS);  in scd4x_stop_meas()
656 	struct scd4x_state *state = data;  in scd4x_disable_regulator()  local
658 	regulator_disable(state->vdd);  in scd4x_disable_regulator()
664 	struct iio_dev *indio_dev = pf->indio_dev;  in scd4x_trigger_handler()
665 	struct scd4x_state *state = iio_priv(indio_dev);  in scd4x_trigger_handler()  local
673 	mutex_lock(&state->lock);  in scd4x_trigger_handler()
674 	ret = scd4x_read_poll(state, scan.data);  in scd4x_trigger_handler()
675 	mutex_unlock(&state->lock);  in scd4x_trigger_handler()
681 	iio_trigger_notify_done(indio_dev->trig);  in scd4x_trigger_handler()
688 	struct device *dev = &client->dev;  in scd4x_probe()
690 	struct scd4x_state *state;  in scd4x_probe()  local
693 	indio_dev = devm_iio_device_alloc(dev, sizeof(*state));  in scd4x_probe()
695 		return -ENOMEM;  in scd4x_probe()
697 	state = iio_priv(indio_dev);  in scd4x_probe()
698 	mutex_init(&state->lock);  in scd4x_probe()
699 	state->client = client;  in scd4x_probe()
702 	indio_dev->info = &scd4x_info;  in scd4x_probe()
703 	indio_dev->name = client->name;  in scd4x_probe()
704 	indio_dev->channels = scd4x_channels;  in scd4x_probe()
705 	indio_dev->num_channels = ARRAY_SIZE(scd4x_channels);  in scd4x_probe()
706 	indio_dev->modes = INDIO_DIRECT_MODE;  in scd4x_probe()
707 	indio_dev->available_scan_masks = scd4x_scan_masks;  in scd4x_probe()
709 	state->vdd = devm_regulator_get(dev, "vdd");  in scd4x_probe()
710 	if (IS_ERR(state->vdd))  in scd4x_probe()
711 		return dev_err_probe(dev, PTR_ERR(state->vdd), "failed to get regulator\n");  in scd4x_probe()
713 	ret = regulator_enable(state->vdd);  in scd4x_probe()
717 	ret = devm_add_action_or_reset(dev, scd4x_disable_regulator, state);  in scd4x_probe()
721 	ret = scd4x_send_command(state, CMD_STOP_MEAS);  in scd4x_probe()
734 	ret = scd4x_send_command(state, CMD_START_MEAS);  in scd4x_probe()
740 	ret = devm_add_action_or_reset(dev, scd4x_stop_meas, state);  in scd4x_probe()