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Message-Id: <20240603-ad4111-v5-6-9a9c54d9ac78@analog.com>
Date: Mon, 03 Jun 2024 19:23:04 +0300
From: Dumitru Ceclan via B4 Relay <devnull+dumitru.ceclan.analog.com@...nel.org>
To: Ceclan Dumitru <dumitru.ceclan@...log.com>
Cc: Lars-Peter Clausen <lars@...afoo.de>,
Michael Hennerich <Michael.Hennerich@...log.com>,
Jonathan Cameron <jic23@...nel.org>, Rob Herring <robh@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>, David Lechner <dlechner@...libre.com>,
linux-iio@...r.kernel.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, Dumitru Ceclan <mitrutzceclan@...il.com>
Subject: [PATCH v5 6/9] iio: adc: ad7173: add support for special inputs
From: Dumitru Ceclan <dumitru.ceclan@...log.com>
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 <dumitru.ceclan@...log.com>
---
drivers/iio/adc/ad7173.c | 28 ++++++++++++++++++++++++++--
1 file changed, 26 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/adc/ad7173.c b/drivers/iio/adc/ad7173.c
index 4040edbd1c32..4cff3eda5a6b 100644
--- a/drivers/iio/adc/ad7173.c
+++ b/drivers/iio/adc/ad7173.c
@@ -66,6 +66,15 @@
FIELD_PREP(AD7173_CH_SETUP_AINNEG_MASK, neg))
#define AD7173_AIN_TEMP_POS 17
#define AD7173_AIN_TEMP_NEG 18
+#define AD7173_AIN_COM_IN_POS 19
+#define AD7173_AIN_COM_IN_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 AD7173_IS_COM_INPUT(x) ((x) == AD7173_AIN_COM_IN_POS || \
+ (x) == AD7173_AIN_COM_IN_NEG)
#define AD7172_2_ID 0x00d0
#define AD7175_ID 0x0cd0
@@ -146,6 +155,8 @@ struct ad7173_device_info {
unsigned int id;
char *name;
bool has_temp;
+ /* ((AVDD1 − AVSS)/5) */
+ bool has_common_input;
bool has_input_buf;
bool has_int_ref;
bool has_ref2;
@@ -216,6 +227,7 @@ static const struct ad7173_device_info ad7173_device_info[] = {
.has_temp = true,
.has_input_buf = true,
.has_int_ref = true,
+ .has_common_input = 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 +242,7 @@ static const struct ad7173_device_info ad7173_device_info[] = {
.has_temp = false,
.has_input_buf = true,
.has_ref2 = true,
+ .has_common_input = true,
.clock = 2 * HZ_PER_MHZ,
.sinc5_data_rates = ad7173_sinc5_data_rates,
.num_sinc5_data_rates = ARRAY_SIZE(ad7173_sinc5_data_rates),
@@ -245,6 +258,7 @@ static const struct ad7173_device_info ad7173_device_info[] = {
.has_input_buf = true,
.has_int_ref = true,
.has_ref2 = true,
+ .has_common_input = false,
.clock = 2 * HZ_PER_MHZ,
.sinc5_data_rates = ad7173_sinc5_data_rates,
.num_sinc5_data_rates = ARRAY_SIZE(ad7173_sinc5_data_rates),
@@ -259,6 +273,7 @@ static const struct ad7173_device_info ad7173_device_info[] = {
.has_temp = true,
.has_input_buf = true,
.has_int_ref = true,
+ .has_common_input = 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 +289,7 @@ static const struct ad7173_device_info ad7173_device_info[] = {
.has_input_buf = true,
.has_int_ref = true,
.has_ref2 = true,
+ .has_common_input = true,
.clock = 16 * HZ_PER_MHZ,
.sinc5_data_rates = ad7175_sinc5_data_rates,
.num_sinc5_data_rates = ARRAY_SIZE(ad7175_sinc5_data_rates),
@@ -288,6 +304,7 @@ static const struct ad7173_device_info ad7173_device_info[] = {
.has_temp = false,
.has_input_buf = false,
.has_int_ref = true,
+ .has_common_input = false,
.clock = 16 * HZ_PER_MHZ,
.sinc5_data_rates = ad7175_sinc5_data_rates,
.num_sinc5_data_rates = ARRAY_SIZE(ad7175_sinc5_data_rates),
@@ -302,6 +319,7 @@ static const struct ad7173_device_info ad7173_device_info[] = {
.has_temp = true,
.has_input_buf = true,
.has_int_ref = true,
+ .has_common_input = true,
.clock = 16 * HZ_PER_MHZ,
.odr_start_value = AD7177_ODR_START_VALUE,
.sinc5_data_rates = ad7175_sinc5_data_rates,
@@ -914,9 +932,15 @@ 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;
+
+ special_input0 = AD7173_IS_REF_INPUT(ain0) ||
+ (AD7173_IS_COM_INPUT(ain0) && st->info->has_common_input);
+ special_input1 = AD7173_IS_REF_INPUT(ain1) ||
+ (AD7173_IS_COM_INPUT(ain1) && st->info->has_common_input);
- 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);
--
2.43.0
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