diff options
Diffstat (limited to 'drivers/iio')
| -rw-r--r-- | drivers/iio/chemical/scd4x.c | 79 |
1 files changed, 73 insertions, 6 deletions
diff --git a/drivers/iio/chemical/scd4x.c b/drivers/iio/chemical/scd4x.c index a4f22d926400..ca6b20270711 100644 --- a/drivers/iio/chemical/scd4x.c +++ b/drivers/iio/chemical/scd4x.c @@ -36,6 +36,8 @@ #define SCD4X_WRITE_BUF_SIZE 5 #define SCD4X_FRC_MIN_PPM 0 #define SCD4X_FRC_MAX_PPM 2000 +#define SCD4X_PRESSURE_COMP_MIN_MBAR 700 +#define SCD4X_PRESSURE_COMP_MAX_MBAR 1200 #define SCD4X_READY_MASK 0x01 /*Commands SCD4X*/ @@ -45,6 +47,8 @@ enum scd4x_cmd { CMD_STOP_MEAS = 0x3f86, CMD_SET_TEMP_OFFSET = 0x241d, CMD_GET_TEMP_OFFSET = 0x2318, + CMD_SET_AMB_PRESSURE = 0xe000, + CMD_GET_AMB_PRESSURE = 0xe000, CMD_FRC = 0x362f, CMD_SET_ASC = 0x2416, CMD_GET_ASC = 0x2313, @@ -137,7 +141,8 @@ static int scd4x_read(struct scd4x_state *state, enum scd4x_cmd cmd, * Measurement needs to be stopped before sending commands. * Except for reading measurement and data ready command. */ - if ((cmd != CMD_GET_DATA_READY) && (cmd != CMD_READ_MEAS)) { + if ((cmd != CMD_GET_DATA_READY) && (cmd != CMD_READ_MEAS) && + (cmd != CMD_GET_AMB_PRESSURE)) { ret = scd4x_send_command(state, CMD_STOP_MEAS); if (ret) return ret; @@ -166,7 +171,8 @@ static int scd4x_read(struct scd4x_state *state, enum scd4x_cmd cmd, } /* start measurement */ - if ((cmd != CMD_GET_DATA_READY) && (cmd != CMD_READ_MEAS)) { + if ((cmd != CMD_GET_DATA_READY) && (cmd != CMD_READ_MEAS) && + (cmd != CMD_GET_AMB_PRESSURE)) { ret = scd4x_send_command(state, CMD_START_MEAS); if (ret) return ret; @@ -188,9 +194,11 @@ static int scd4x_write(struct scd4x_state *state, enum scd4x_cmd cmd, uint16_t a buf[4] = crc; /* measurement needs to be stopped before sending commands */ - ret = scd4x_send_command(state, CMD_STOP_MEAS); - if (ret) - return ret; + if (cmd != CMD_SET_AMB_PRESSURE) { + ret = scd4x_send_command(state, CMD_STOP_MEAS); + if (ret) + return ret; + } /* execution time */ msleep_interruptible(500); @@ -200,7 +208,7 @@ static int scd4x_write(struct scd4x_state *state, enum scd4x_cmd cmd, uint16_t a return ret; /* start measurement, except for forced calibration command */ - if (cmd != CMD_FRC) { + if ((cmd != CMD_FRC) && (cmd != CMD_SET_AMB_PRESSURE)) { ret = scd4x_send_command(state, CMD_START_MEAS); if (ret) return ret; @@ -338,6 +346,18 @@ static int scd4x_read_raw(struct iio_dev *indio_dev, switch (mask) { case IIO_CHAN_INFO_RAW: + if (chan->output) { + mutex_lock(&state->lock); + ret = scd4x_read(state, CMD_GET_AMB_PRESSURE, &tmp, sizeof(tmp)); + mutex_unlock(&state->lock); + + if (ret) + return ret; + + *val = be16_to_cpu(tmp); + return IIO_VAL_INT; + } + ret = iio_device_claim_direct_mode(indio_dev); if (ret) return ret; @@ -386,6 +406,25 @@ static int scd4x_read_raw(struct iio_dev *indio_dev, } } +static const int scd4x_pressure_calibbias_available[] = { + SCD4X_PRESSURE_COMP_MIN_MBAR, 1, SCD4X_PRESSURE_COMP_MAX_MBAR, +}; + +static int scd4x_read_avail(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, + const int **vals, int *type, int *length, long mask) +{ + switch (mask) { + case IIO_CHAN_INFO_RAW: + *vals = scd4x_pressure_calibbias_available; + *type = IIO_VAL_INT; + + return IIO_AVAIL_RANGE; + } + + return -EINVAL; +} + + static int scd4x_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const *chan, int val, int val2, long mask) { @@ -399,6 +438,21 @@ static int scd4x_write_raw(struct iio_dev *indio_dev, struct iio_chan_spec const mutex_unlock(&state->lock); return ret; + case IIO_CHAN_INFO_RAW: + switch (chan->type) { + case IIO_PRESSURE: + if (val < SCD4X_PRESSURE_COMP_MIN_MBAR || + val > SCD4X_PRESSURE_COMP_MAX_MBAR) + return -EINVAL; + + mutex_lock(&state->lock); + ret = scd4x_write(state, CMD_SET_AMB_PRESSURE, val); + mutex_unlock(&state->lock); + + return ret; + default: + return -EINVAL; + } default: return -EINVAL; } @@ -503,10 +557,23 @@ static const struct iio_info scd4x_info = { .attrs = &scd4x_attr_group, .read_raw = scd4x_read_raw, .write_raw = scd4x_write_raw, + .read_avail = scd4x_read_avail, }; static const struct iio_chan_spec scd4x_channels[] = { { + /* + * this channel is special in a sense we are pretending that + * sensor is able to change measurement chamber pressure but in + * fact we're just setting pressure compensation value + */ + .type = IIO_PRESSURE, + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), + .info_mask_separate_available = BIT(IIO_CHAN_INFO_RAW), + .output = 1, + .scan_index = -1, + }, + { .type = IIO_CONCENTRATION, .channel2 = IIO_MOD_CO2, .modified = 1, |