Re: [PATCH v4 4/4] iio: vcnl4000: Add buffer support for VCNL4010/20.

Andy Shevchenko
2020-04-21T12:27:23Z

On Tue, Apr 21, 2020 at 10:59 AM Mathieu Othacehe <m.othacehe@gmail.com> wrote:
>
> The VCNL4010 and VCNL4020 chips are able to raise interrupts on data ready.
> Use it to provide triggered buffer support for proximity data.
>
> Those two chips also provide ambient light data. However, they are sampled
> at different rate than proximity data. As this is not handled by the IIO
> framework for now, and the sample frequencies of ambient light data are
> very low, do add buffer support for them.

...

> +static irqreturn_t vcnl4010_trigger_handler(int irq, void *p)
> +{
> + struct iio_poll_func *pf = p;
> + struct iio_dev *indio_dev = pf->indio_dev;
> + struct vcnl4000_data *data = iio_priv(indio_dev);
> + const unsigned long *active_scan_mask = indio_dev->active_scan_mask;
> + u16 buffer[8] = {0}; /* 1x16-bit + ts */
> + bool data_read = false;
> + unsigned long isr;
> + int val = 0;
> + int ret;
> +
> + ret = i2c_smbus_read_byte_data(data->client, VCNL4010_ISR);
> + if (ret < 0)
> + goto end;
> +
> + isr = ret;
> +
> + if (test_bit(0, active_scan_mask)) {
> + if (test_bit(VCNL4010_INT_PROXIMITY, &isr)) {
> + ret = vcnl4000_read_data(data,
> + VCNL4000_PS_RESULT_HI,
> + &val);
> + if (ret < 0)
> + goto end;
> +
> + buffer[0] = val;
> + data_read = true;
> + }
> + }
> +
> + ret = i2c_smbus_write_byte_data(data->client, VCNL4010_ISR,
> + isr & VCNL4010_INT_DRDY);

> + if (ret < 0 || !data_read)

I would split them, because they are logically different checks.

> + goto end;
> +
> + iio_push_to_buffers_with_timestamp(indio_dev, buffer,
> + iio_get_time_ns(indio_dev));
> +
> end:
> + iio_trigger_notify_done(indio_dev->trig);
> return IRQ_HANDLED;
> }

...

> +static int vcnl4010_buffer_predisable(struct iio_dev *indio_dev)
> +{
> + struct vcnl4000_data *data = iio_priv(indio_dev);
> + int ret, ret_disable;
> +
> + ret = i2c_smbus_write_byte_data(data->client, VCNL4010_INT_CTRL, 0);
> + if (ret < 0)
> + goto end;
> +
> + ret = i2c_smbus_write_byte_data(data->client, VCNL4000_COMMAND, 0);
> +
> +end:

> + ret_disable = iio_triggered_buffer_predisable(indio_dev);
> + if (ret == 0)
> + ret = ret_disable;

What is this?

Can't you rather call IIO API first, and then try to handle the rest?

> + return ret;
> +}

--
With Best Regards,
Andy Shevchenko