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SubjectRe: [PATCH v2] iio: adc: ad7887: Cleanup channel assignment
On Mon, 25 Nov 2019 15:21:37 +0200
Beniamin Bia <beniamin.bia@analog.com> wrote:

> The channels specification assignment in chip info was simplified.
> This patch makes supporting other devices by this driver easier.
>
> Signed-off-by: Beniamin Bia <beniamin.bia@analog.com>
Applied to the togreg branch of iio.git and pushed out as testing for
the autobuilders to play with it.

Thanks,

Jonathan

> ---
> Changes in v2:
> -separate iio_chan_spec for dual mode
>
> drivers/iio/adc/ad7887.c | 82 +++++++++++++++++++++-------------------
> 1 file changed, 43 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/iio/adc/ad7887.c b/drivers/iio/adc/ad7887.c
> index 6223043e432b..c6a3428e950a 100644
> --- a/drivers/iio/adc/ad7887.c
> +++ b/drivers/iio/adc/ad7887.c
> @@ -43,11 +43,17 @@ enum ad7887_channels {
> /**
> * struct ad7887_chip_info - chip specifc information
> * @int_vref_mv: the internal reference voltage
> - * @channel: channel specification
> + * @channels: channels specification
> + * @num_channels: number of channels
> + * @dual_channels: channels specification in dual mode
> + * @num_dual_channels: number of channels in dual mode
> */
> struct ad7887_chip_info {
> u16 int_vref_mv;
> - struct iio_chan_spec channel[3];
> + const struct iio_chan_spec *channels;
> + unsigned int num_channels;
> + const struct iio_chan_spec *dual_channels;
> + unsigned int num_dual_channels;
> };
>
> struct ad7887_state {
> @@ -183,45 +189,43 @@ static int ad7887_read_raw(struct iio_dev *indio_dev,
> return -EINVAL;
> }
>
> +#define AD7887_CHANNEL(x) { \
> + .type = IIO_VOLTAGE, \
> + .indexed = 1, \
> + .channel = (x), \
> + .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
> + .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), \
> + .address = (x), \
> + .scan_index = (x), \
> + .scan_type = { \
> + .sign = 'u', \
> + .realbits = 12, \
> + .storagebits = 16, \
> + .shift = 0, \
> + .endianness = IIO_BE, \
> + }, \
> +}
> +
> +static const struct iio_chan_spec ad7887_channels[] = {
> + AD7887_CHANNEL(0),
> + IIO_CHAN_SOFT_TIMESTAMP(1),
> +};
> +
> +static const struct iio_chan_spec ad7887_dual_channels[] = {
> + AD7887_CHANNEL(0),
> + AD7887_CHANNEL(1),
> + IIO_CHAN_SOFT_TIMESTAMP(2),
> +};
>
> static const struct ad7887_chip_info ad7887_chip_info_tbl[] = {
> /*
> * More devices added in future
> */
> [ID_AD7887] = {
> - .channel[0] = {
> - .type = IIO_VOLTAGE,
> - .indexed = 1,
> - .channel = 1,
> - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> - .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
> - .address = 1,
> - .scan_index = 1,
> - .scan_type = {
> - .sign = 'u',
> - .realbits = 12,
> - .storagebits = 16,
> - .shift = 0,
> - .endianness = IIO_BE,
> - },
> - },
> - .channel[1] = {
> - .type = IIO_VOLTAGE,
> - .indexed = 1,
> - .channel = 0,
> - .info_mask_separate = BIT(IIO_CHAN_INFO_RAW),
> - .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),
> - .address = 0,
> - .scan_index = 0,
> - .scan_type = {
> - .sign = 'u',
> - .realbits = 12,
> - .storagebits = 16,
> - .shift = 0,
> - .endianness = IIO_BE,
> - },
> - },
> - .channel[2] = IIO_CHAN_SOFT_TIMESTAMP(2),
> + .channels = ad7887_channels,
> + .num_channels = ARRAY_SIZE(ad7887_channels),
> + .dual_channels = ad7887_dual_channels,
> + .num_dual_channels = ARRAY_SIZE(ad7887_dual_channels),
> .int_vref_mv = 2500,
> },
> };
> @@ -306,11 +310,11 @@ static int ad7887_probe(struct spi_device *spi)
> spi_message_init(&st->msg[AD7887_CH1]);
> spi_message_add_tail(&st->xfer[3], &st->msg[AD7887_CH1]);
>
> - indio_dev->channels = st->chip_info->channel;
> - indio_dev->num_channels = 3;
> + indio_dev->channels = st->chip_info->dual_channels;
> + indio_dev->num_channels = st->chip_info->num_dual_channels;
> } else {
> - indio_dev->channels = &st->chip_info->channel[1];
> - indio_dev->num_channels = 2;
> + indio_dev->channels = st->chip_info->channels;
> + indio_dev->num_channels = st->chip_info->num_channels;
> }
>
> ret = iio_triggered_buffer_setup(indio_dev, &iio_pollfunc_store_time,

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