Commit ff05b4a8 authored by Dumitru Ceclan's avatar Dumitru Ceclan Committed by Jonathan Cameron
Browse files

iio: adc: ad7173: add support for special inputs 



 Add support for selecting REF+ and REF- inputs on all models.
 Add support for selecting ((AVDD1 − AVSS)/5) inputs
  on supported models.

Signed-off-by: default avatarDumitru Ceclan <dumitru.ceclan@analog.com>
Reviewed-by: default avatarNuno Sa <nuno.sa@analog.com>
Reviewed-by: default avatarDavid Lechner <dlechner@baylibre.com>
Link: https://patch.msgid.link/20240607-ad4111-v7-6-97e3855900a0@analog.com


Signed-off-by: default avatarJonathan Cameron <Jonathan.Cameron@huawei.com>
parent fc5cdff0

drivers/iio/adc/ad7173.c

+25 −2
Original line number Diff line number Diff line
@@ -66,6 +66,13 @@ 
	 FIELD_PREP(AD7173_CH_SETUP_AINNEG_MASK, neg))

#define AD7173_AIN_TEMP_POS	17

#define AD7173_AIN_TEMP_NEG	18

#define AD7173_AIN_POW_MON_POS	19

#define AD7173_AIN_POW_MON_NEG	20

#define AD7173_AIN_REF_POS	21

#define AD7173_AIN_REF_NEG	22



#define AD7173_IS_REF_INPUT(x)		((x) == AD7173_AIN_REF_POS || \

					(x) == AD7173_AIN_REF_NEG)



#define AD7172_2_ID			0x00d0

#define AD7175_ID			0x0cd0
@@ -146,6 +153,8 @@ struct ad7173_device_info { 
	unsigned int id;

	char *name;

	bool has_temp;

	/* ((AVDD1 − AVSS)/5) */

	bool has_pow_supply_monitoring;

	bool has_input_buf;

	bool has_int_ref;

	bool has_ref2;
@@ -216,6 +225,7 @@ static const struct ad7173_device_info ad7173_device_info[] = { 
		.has_temp = true,

		.has_input_buf = true,

		.has_int_ref = true,

		.has_pow_supply_monitoring = true,

		.clock = 2 * HZ_PER_MHZ,

		.sinc5_data_rates = ad7173_sinc5_data_rates,

		.num_sinc5_data_rates = ARRAY_SIZE(ad7173_sinc5_data_rates),
@@ -230,6 +240,7 @@ static const struct ad7173_device_info ad7173_device_info[] = { 
		.has_temp = false,

		.has_input_buf = true,

		.has_ref2 = true,

		.has_pow_supply_monitoring = true,

		.clock = 2 * HZ_PER_MHZ,

		.sinc5_data_rates = ad7173_sinc5_data_rates,

		.num_sinc5_data_rates = ARRAY_SIZE(ad7173_sinc5_data_rates),
@@ -259,6 +270,7 @@ static const struct ad7173_device_info ad7173_device_info[] = { 
		.has_temp = true,

		.has_input_buf = true,

		.has_int_ref = true,

		.has_pow_supply_monitoring = true,

		.clock = 16 * HZ_PER_MHZ,

		.sinc5_data_rates = ad7175_sinc5_data_rates,

		.num_sinc5_data_rates = ARRAY_SIZE(ad7175_sinc5_data_rates),
@@ -274,6 +286,7 @@ static const struct ad7173_device_info ad7173_device_info[] = { 
		.has_input_buf = true,

		.has_int_ref = true,

		.has_ref2 = true,

		.has_pow_supply_monitoring = true,

		.clock = 16 * HZ_PER_MHZ,

		.sinc5_data_rates = ad7175_sinc5_data_rates,

		.num_sinc5_data_rates = ARRAY_SIZE(ad7175_sinc5_data_rates),
@@ -302,6 +315,7 @@ static const struct ad7173_device_info ad7173_device_info[] = { 
		.has_temp = true,

		.has_input_buf = true,

		.has_int_ref = true,

		.has_pow_supply_monitoring = true,

		.clock = 16 * HZ_PER_MHZ,

		.odr_start_value = AD7177_ODR_START_VALUE,

		.sinc5_data_rates = ad7175_sinc5_data_rates,
@@ -910,9 +924,18 @@ static int ad7173_validate_voltage_ain_inputs(struct ad7173_state *st, 
					      unsigned int ain0, unsigned int ain1)

{

	struct device *dev = &st->sd.spi->dev;

	bool special_input0, special_input1;



	/* (AVDD1-AVSS)/5 power supply monitoring */

	if (ain0 == AD7173_AIN_POW_MON_POS && ain1 == AD7173_AIN_POW_MON_NEG &&

	    st->info->has_pow_supply_monitoring)

		return 0;



	special_input0 = AD7173_IS_REF_INPUT(ain0);

	special_input1 = AD7173_IS_REF_INPUT(ain1);



	if (ain0 >= st->info->num_inputs ||

	    ain1 >= st->info->num_inputs)

	if ((ain0 >= st->info->num_inputs && !special_input0) ||

	    (ain1 >= st->info->num_inputs && !special_input1))

		return dev_err_probe(dev, -EINVAL,

				     "Input pin number out of range for pair (%d %d).\n",

				     ain0, ain1);