From ff05b4a86dea94f8689bb1e76ec03ea8ffe0e2fd Mon Sep 17 00:00:00 2001 From: Dumitru Ceclan Date: Fri, 7 Jun 2024 17:53:12 +0300 Subject: [PATCH] iio: adc: ad7173: add support for special inputs MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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: Dumitru Ceclan Reviewed-by: Nuno Sa Reviewed-by: David Lechner Link: https://patch.msgid.link/20240607-ad4111-v7-6-97e3855900a0@analog.com Signed-off-by: Jonathan Cameron --- drivers/iio/adc/ad7173.c | 27 +++++++++++++++++++++++++-- 1 file changed, 25 insertions(+), 2 deletions(-) diff --git a/drivers/iio/adc/ad7173.c b/drivers/iio/adc/ad7173.c index cacc411b87ac..f0696b4b6e56 100644 --- a/drivers/iio/adc/ad7173.c +++ b/drivers/iio/adc/ad7173.c @@ -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); -- 2.20.1