On Thu, 23 May 2024 11:19:09 +0800
Kim Seer Paller <kimseer.paller@xxxxxxxxxx> wrote:
> LTC2664 4 channel, 16 bit Voltage Output SoftSpan DAC
> LTC2672 5 channel, 16 bit Current Output Softspan DAC
>
> Co-developed-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
> Signed-off-by: Michael Hennerich <michael.hennerich@xxxxxxxxxx>
> Signed-off-by: Kim Seer Paller <kimseer.paller@xxxxxxxxxx>
Hi Kim,
A few minor things inline,
Jonathan
> diff --git a/drivers/iio/dac/ltc2664.c b/drivers/iio/dac/ltc2664.c
> new file mode 100644
> index 000000000000..488b841e6c66
> --- /dev/null
> +++ b/drivers/iio/dac/ltc2664.c
> @@ -0,0 +1,802 @@
> +static int ltc2664_set_span(const struct ltc2664_state *st, int min, int max,
> + int chan)
> +{
> + const struct ltc2664_chip_info *chip_info = st->chip_info;
> + const int (*span_helper)[2] = chip_info->span_helper;
> + int span, ret;
> +
> + st->iio_channels[chan].type = chip_info->measurement_type;
> +
> + for (span = 0; span < chip_info->num_span; span++) {
> + if (min == span_helper[span][0] && max == span_helper[span][1])
> + break;
> + }
Sanity check for no match?
> +
> + ret = regmap_write(st->regmap, LTC2664_CMD_SPAN_N(chan),
> + (chip_info->id == LTC2672) ? span + 1 : span);
> + if (ret)
> + return ret;
> +
> + return span;
> +}
> +
> +static int ltc2664_channel_config(struct ltc2664_state *st)
> +{
> + const struct ltc2664_chip_info *chip_info = st->chip_info;
> + struct device *dev = &st->spi->dev;
> + u32 reg, tmp[2], mspan;
> + int ret, span;
> +
> + mspan = LTC2664_MSPAN_SOFTSPAN;
> + ret = device_property_read_u32(dev, "adi,manual-span-operation-config",
> + &mspan);
> + if (!ret) {
> + if (!chip_info->manual_span_support)
> + return dev_err_probe(dev, -EINVAL,
> + "adi,manual-span-operation-config not supported\n");
> +
> + if (mspan > ARRAY_SIZE(ltc2664_mspan_lut))
> + return dev_err_probe(dev, -EINVAL,
> + "adi,manual-span-operation-config not in range\n");
> + }
> +
> + st->rfsadj = 20000;
> + ret = device_property_read_u32(dev, "adi,rfsadj-ohms", &st->rfsadj);
> + if (!ret) {
> + if (!chip_info->rfsadj_support)
> + return dev_err_probe(dev, -EINVAL,
> + "adi,rfsadj-ohms not supported\n");
> +
> + if (st->rfsadj < 19000 || st->rfsadj > 41000)
> + return dev_err_probe(dev, -EINVAL,
> + "adi,rfsadj-ohms not in range\n");
> + }
> +
> + device_for_each_child_node_scoped(dev, child) {
> + struct ltc2664_chan *chan;
> +
> + ret = fwnode_property_read_u32(child, "reg", ®);
> + if (ret)
> + return dev_err_probe(dev, ret,
> + "Failed to get reg property\n");
> +
> + if (reg >= chip_info->num_channels)
> + return dev_err_probe(dev, -EINVAL,
> + "reg bigger than: %d\n",
> + chip_info->num_channels);
> +
> + chan = &st->channels[reg];
> +
> + if (fwnode_property_read_bool(child, "adi,toggle-mode")) {
> + chan->toggle_chan = true;
> + /* assume sw toggle ABI */
> + st->iio_channels[reg].ext_info = ltc2664_toggle_sym_ext_info;
chan->ext_info = ...
> + /*
> + * Clear IIO_CHAN_INFO_RAW bit as toggle channels expose
> + * out_voltage/current_raw{0|1} files.
> + */
> + __clear_bit(IIO_CHAN_INFO_RAW,
> + &st->iio_channels[reg].info_mask_separate);
> + }
> +
> + chan->raw[0] = ltc2664_mspan_lut[mspan][1];
> + chan->raw[1] = ltc2664_mspan_lut[mspan][1];
> +
> + chan->span = ltc2664_mspan_lut[mspan][0];
> +
> + ret = fwnode_property_read_u32_array(child, "adi,output-range-microvolt",
> + tmp, ARRAY_SIZE(tmp));
> + if (!ret && mspan == LTC2664_MSPAN_SOFTSPAN) {
> + chan->span = ltc2664_set_span(st, tmp[0] / 1000,
> + tmp[1] / 1000, reg);
> + if (span < 0)
> + return dev_err_probe(dev, span,
> + "Failed to set span\n");
> +
> + }
> +
> + ret = fwnode_property_read_u32(child,
> + "adi,output-range-microamp",
> + &tmp[0]);
> + if (!ret) {
> + chan->span = ltc2664_set_span(st, 0, tmp[0] / 1000, reg);
> + if (span < 0)
> + return dev_err_probe(dev, span,
> + "Failed to set span\n");
> + }
> + }
> +
> + return 0;
> +}
