iio: addac: ad74413r: fix Current Input, Loop Powered Mode

Currently, the driver handles CH_FUNC_CURRENT_INPUT_LOOP_POWER and
CH_FUNC_CURRENT_INPUT_EXT_POWER completely identically. But that's not
correct. In order for CH_FUNC_CURRENT_INPUT_LOOP_POWER to work, two
changes must be made:

(1) expose access to the DAC_CODE_x register so that the intended
output current can be set, i.e. expose the channel as both current
output and current input, and

(2) per the data sheet

  When selecting the current input loop powered function, tie the
  VIOUTN_x pin to ground via the on-chip 200 kΩ resistor by enabling
  the CH_200K_TO_GND bit in the ADC_CONFIGx registers.

Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Link: https://lore.kernel.org/r/20230301115511.849418-1-linux@rasmusvillemoes.dk
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>

diff --git a/drivers/iio/addac/ad74413r.c b/drivers/iio/addac/ad74413r.c
index 4395758..07e9f6a 100644 (file)
--- a/drivers/iio/addac/ad74413r.c
+++ b/drivers/iio/addac/ad74413r.c
@@ -100,6 +100,7 @@ struct ad74413r_state {
 #define AD74413R_REG_ADC_CONFIG_X(x)           (0x05 + (x))
 #define AD74413R_ADC_CONFIG_RANGE_MASK         GENMASK(7, 5)
 #define AD74413R_ADC_CONFIG_REJECTION_MASK     GENMASK(4, 3)
+#define AD74413R_ADC_CONFIG_CH_200K_TO_GND     BIT(2)
 #define AD74413R_ADC_RANGE_10V                 0b000
 #define AD74413R_ADC_RANGE_2P5V_EXT_POW                0b001
 #define AD74413R_ADC_RANGE_2P5V_INT_POW                0b010
@@ -438,9 +439,20 @@ static int ad74413r_set_channel_dac_code(struct ad74413r_state *st,
 static int ad74413r_set_channel_function(struct ad74413r_state *st,
                                         unsigned int channel, u8 func)
 {
-       return regmap_update_bits(st->regmap,
+       int ret;
+
+       ret = regmap_update_bits(st->regmap,
                                  AD74413R_REG_CH_FUNC_SETUP_X(channel),
                                  AD74413R_CH_FUNC_SETUP_MASK, func);
+       if (ret)
+               return ret;
+
+       if (func == CH_FUNC_CURRENT_INPUT_LOOP_POWER)
+               ret = regmap_set_bits(st->regmap,
+                                     AD74413R_REG_ADC_CONFIG_X(channel),
+                                     AD74413R_ADC_CONFIG_CH_200K_TO_GND);
+
+       return ret;
 }
 
 static int ad74413r_set_adc_conv_seq(struct ad74413r_state *st,
@@ -1126,6 +1138,11 @@ static struct iio_chan_spec ad74413r_current_input_channels[] = {
        AD74413R_ADC_CURRENT_CHANNEL,
 };
 
+static struct iio_chan_spec ad74413r_current_input_loop_channels[] = {
+       AD74413R_DAC_CHANNEL(IIO_CURRENT, BIT(IIO_CHAN_INFO_SCALE)),
+       AD74413R_ADC_CURRENT_CHANNEL,
+};
+
 static struct iio_chan_spec ad74413r_resistance_input_channels[] = {
        AD74413R_ADC_CHANNEL(IIO_RESISTANCE, BIT(IIO_CHAN_INFO_PROCESSED)),
 };
@@ -1149,7 +1166,7 @@ static const struct ad74413r_channels ad74413r_channels_map[] = {
        [CH_FUNC_CURRENT_OUTPUT] = AD74413R_CHANNELS(current_output),
        [CH_FUNC_VOLTAGE_INPUT] = AD74413R_CHANNELS(voltage_input),
        [CH_FUNC_CURRENT_INPUT_EXT_POWER] = AD74413R_CHANNELS(current_input),
-       [CH_FUNC_CURRENT_INPUT_LOOP_POWER] = AD74413R_CHANNELS(current_input),
+       [CH_FUNC_CURRENT_INPUT_LOOP_POWER] = AD74413R_CHANNELS(current_input_loop),
        [CH_FUNC_RESISTANCE_INPUT] = AD74413R_CHANNELS(resistance_input),
        [CH_FUNC_DIGITAL_INPUT_LOGIC] = AD74413R_CHANNELS(digital_input),
        [CH_FUNC_DIGITAL_INPUT_LOOP_POWER] = AD74413R_CHANNELS(digital_input),