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SubjectRe: [PATCH v3 3/7] iio:dac:ad5686: Add support for various number of channels
On Wed, 11 Apr 2018 14:52:31 +0300
Stefan Popa <stefan.popa@analog.com> wrote:

> This patch adds a new num_channels attribute as part of the
> ad5686_chip_info struct which replaces the AD5686_DAC_CHANNELS define. This
> is a necessary step, since this driver should support similar devices which
> differ only in the number of channels.
Applied to the togreg branch of iio.git and pushed out as testing for the
autobuilders to play with it.

Thanks,

Jonathan

>
> Signed-off-by: Stefan Popa <stefan.popa@analog.com>
> ---
> Changes in v2:
> - Refactored the patch to add num_channels and the new macro forms
> for the existing parts.
> Changes in v3:
> - Nothing changed, just follow the patch set version.
>
> drivers/iio/dac/ad5686.c | 45 +++++++++++++++++++++++++--------------------
> 1 file changed, 25 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/iio/dac/ad5686.c b/drivers/iio/dac/ad5686.c
> index e328513..87d6e6e 100644
> --- a/drivers/iio/dac/ad5686.c
> +++ b/drivers/iio/dac/ad5686.c
> @@ -18,8 +18,6 @@
> #include <linux/iio/iio.h>
> #include <linux/iio/sysfs.h>
>
> -#define AD5686_DAC_CHANNELS 4
> -
> #define AD5686_ADDR(x) ((x) << 16)
> #define AD5686_CMD(x) ((x) << 20)
>
> @@ -45,12 +43,14 @@
> /**
> * struct ad5686_chip_info - chip specific information
> * @int_vref_mv: AD5620/40/60: the internal reference voltage
> + * @num_channels: number of channels
> * @channel: channel specification
> */
>
> struct ad5686_chip_info {
> u16 int_vref_mv;
> - struct iio_chan_spec channel[AD5686_DAC_CHANNELS];
> + unsigned int num_channels;
> + struct iio_chan_spec *channels;
> };
>
> /**
> @@ -268,14 +268,14 @@ static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
> { },
> };
>
> -#define AD5868_CHANNEL(chan, bits, _shift) { \
> +#define AD5868_CHANNEL(chan, addr, bits, _shift) { \
> .type = IIO_VOLTAGE, \
> .indexed = 1, \
> .output = 1, \
> .channel = chan, \
> .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), \
> .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE),\
> - .address = AD5686_ADDR_DAC(chan), \
> + .address = addr, \
> .scan_type = { \
> .sign = 'u', \
> .realbits = (bits), \
> @@ -285,31 +285,36 @@ static const struct iio_chan_spec_ext_info ad5686_ext_info[] = {
> .ext_info = ad5686_ext_info, \
> }
>
> +#define DECLARE_AD5686_CHANNELS(name, bits, _shift) \
> +static struct iio_chan_spec name[] = { \
> + AD5868_CHANNEL(0, 1, bits, _shift), \
> + AD5868_CHANNEL(1, 2, bits, _shift), \
> + AD5868_CHANNEL(2, 4, bits, _shift), \
> + AD5868_CHANNEL(3, 8, bits, _shift), \
> +}
> +
> +DECLARE_AD5686_CHANNELS(ad5684_channels, 12, 4);
> +DECLARE_AD5686_CHANNELS(ad5685r_channels, 14, 2);
> +DECLARE_AD5686_CHANNELS(ad5686_channels, 16, 0);
> +
> static const struct ad5686_chip_info ad5686_chip_info_tbl[] = {
> [ID_AD5684] = {
> - .channel[0] = AD5868_CHANNEL(0, 12, 4),
> - .channel[1] = AD5868_CHANNEL(1, 12, 4),
> - .channel[2] = AD5868_CHANNEL(2, 12, 4),
> - .channel[3] = AD5868_CHANNEL(3, 12, 4),
> + .channels = ad5684_channels,
> + .num_channels = 4,
> .int_vref_mv = 2500,
> },
> [ID_AD5685] = {
> - .channel[0] = AD5868_CHANNEL(0, 14, 2),
> - .channel[1] = AD5868_CHANNEL(1, 14, 2),
> - .channel[2] = AD5868_CHANNEL(2, 14, 2),
> - .channel[3] = AD5868_CHANNEL(3, 14, 2),
> + .channels = ad5685r_channels,
> .int_vref_mv = 2500,
> + .num_channels = 4,
> },
> [ID_AD5686] = {
> - .channel[0] = AD5868_CHANNEL(0, 16, 0),
> - .channel[1] = AD5868_CHANNEL(1, 16, 0),
> - .channel[2] = AD5868_CHANNEL(2, 16, 0),
> - .channel[3] = AD5868_CHANNEL(3, 16, 0),
> + .channels = ad5686_channels,
> + .num_channels = 4,
> .int_vref_mv = 2500,
> },
> };
>
> -
> static int ad5686_probe(struct spi_device *spi)
> {
> struct ad5686_state *st;
> @@ -353,8 +358,8 @@ static int ad5686_probe(struct spi_device *spi)
> indio_dev->name = spi_get_device_id(spi)->name;
> indio_dev->info = &ad5686_info;
> indio_dev->modes = INDIO_DIRECT_MODE;
> - indio_dev->channels = st->chip_info->channel;
> - indio_dev->num_channels = AD5686_DAC_CHANNELS;
> + indio_dev->channels = st->chip_info->channels;
> + indio_dev->num_channels = st->chip_info->num_channels;
>
> ret = ad5686_spi_write(st, AD5686_CMD_INTERNAL_REFER_SETUP, 0,
> !!voltage_uv, 0);

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