On Sun, 7 Jun 2020 19:58:09 +0200
Tomasz Duszynski <tomasz.duszynski@xxxxxxxxxxx> wrote:
> Add Sensirion SCD30 carbon dioxide core driver.
>
> Signed-off-by: Tomasz Duszynski <tomasz.duszynski@xxxxxxxxxxx>
A few things I'd missed showed up in warnings when I applied this and
ran a sparse check. Please fix up and send a v6.
Also sanity check the rest with sparse. Note if I'd missed this 0-day
would have sent use these warnings.
Thanks,
Jonathan
> +
> +static int scd30_read_meas(struct scd30_state *state)
> +{
> + int i, ret;
> +
> + ret = state->command(state, CMD_READ_MEAS, 0, state->meas, sizeof(state->meas));
> + if (ret)
> + return ret;
> +
> + be32_to_cpu_array(state->meas, state->meas, ARRAY_SIZE(state->meas));
The type of the input to the above has the wrong endian markings.
CHECK drivers/iio/chemical/scd30_core.c
drivers/iio/chemical/scd30_core.c:123:40: warning: incorrect type in argument 2 (different base types)
drivers/iio/chemical/scd30_core.c:123:40: expected restricted __be32 const [usertype] *src
drivers/iio/chemical/scd30_core.c:123:40: got int *
Whilst you could use a cast, it would be tidier to use an array of __be32.
> +
> + for (i = 0; i < ARRAY_SIZE(state->meas); i++)
> + state->meas[i] = scd30_float_to_fp(state->meas[i]);
> +
> + /*
> + * co2 is left unprocessed while temperature and humidity are scaled
> + * to milli deg C and milli percent respectively.
> + */
> + state->meas[SCD30_TEMP] *= 10;
> + state->meas[SCD30_HR] *= 10;
> +
> + return 0;
> +}
> +
...
> +
> +static 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 = { 0, };
should be scan = { {0, }, }; or something like that
as first element happens to be an array.
Actually there is padding in here you need to zero I think.
So memset is a better bet.
> + int ret;
> +
> + mutex_lock(&state->lock);
> + if (!iio_trigger_using_own(indio_dev))
> + ret = scd30_read_poll(state);
> + else
> + ret = scd30_read_meas(state);
> + 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;
> +}
> +
...
