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Message-ID: <20250815164627.22002-6-bcollins@watter.com>
Date: Fri, 15 Aug 2025 16:46:07 +0000
From: Ben Collins <bcollins@...ter.com>
To: Jonathan Cameron <jic23@...nel.org>,
David Lechner <dlechner@...libre.com>,
Nuno Sá <nuno.sa@...log.com>,
Andy Shevchenko <andy@...nel.org>
Cc: Ben Collins <bcollins@...ter.com>,
linux-iio@...r.kernel.org,
linux-kernel@...r.kernel.org
Subject: [PATCH 5/5] iio: mcp9600: Add support for IIR filter
MCP9600 supports an IIR filter with 7 levels. Add IIR attribute
to allow get/set of this value.
Signed-off-by: Ben Collins <bcollins@...ter.com>
---
drivers/iio/temperature/mcp9600.c | 73 +++++++++++++++++++++++++++++++
1 file changed, 73 insertions(+)
diff --git a/drivers/iio/temperature/mcp9600.c b/drivers/iio/temperature/mcp9600.c
index 361572a241f06..896520ddf6d3c 100644
--- a/drivers/iio/temperature/mcp9600.c
+++ b/drivers/iio/temperature/mcp9600.c
@@ -31,6 +31,7 @@
#define MCP9600_STATUS_ALERT(x) BIT(x)
#define MCP9600_SENSOR_CFG 0x05
#define MCP9600_SENSOR_TYPE_MASK GENMASK(6, 4)
+#define MCP9600_FILTER_MASK GENMASK(2, 0)
#define MCP9600_ALERT_CFG1 0x08
#define MCP9600_ALERT_CFG(x) (MCP9600_ALERT_CFG1 + (x - 1))
#define MCP9600_ALERT_CFG_ENABLE BIT(0)
@@ -94,6 +95,10 @@ static const int mcp9600_tc_types[] = {
[THERMOCOUPLE_TYPE_R] = 'R',
};
+static const int mcp_iir_coefficients_avail[] = {
+ 1, 2, 4, 8, 16, 32, 64, 128,
+};
+
static const struct iio_event_spec mcp9600_events[] = {
{
.type = IIO_EV_TYPE_THRESH,
@@ -118,7 +123,10 @@ static const struct iio_event_spec mcp9600_events[] = {
.address = MCP9600_HOT_JUNCTION, \
.info_mask_separate = BIT(IIO_CHAN_INFO_RAW) | \
BIT(IIO_CHAN_INFO_THERMOCOUPLE_TYPE) | \
+ BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY) | \
BIT(IIO_CHAN_INFO_SCALE), \
+ .info_mask_separate_available = \
+ BIT(IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY), \
.event_spec = &mcp9600_events[hj_ev_spec_off], \
.num_event_specs = hj_num_ev, \
}, \
@@ -161,6 +169,7 @@ struct mcp_chip_info {
struct mcp9600_data {
struct i2c_client *client;
u32 thermocouple_type;
+ u8 filter_level; /* Chip default is 0 */
};
static int mcp9600_read(struct mcp9600_data *data,
@@ -191,13 +200,36 @@ static int mcp9600_read_raw(struct iio_dev *indio_dev,
if (ret)
return ret;
return IIO_VAL_INT;
+
case IIO_CHAN_INFO_SCALE:
*val = 62;
*val2 = 500000;
return IIO_VAL_INT_PLUS_MICRO;
+
case IIO_CHAN_INFO_THERMOCOUPLE_TYPE:
*val = mcp9600_tc_types[data->thermocouple_type];
return IIO_VAL_CHAR;
+
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+ *val = mcp_iir_coefficients_avail[data->filter_level];
+ return IIO_VAL_INT;
+
+ default:
+ return -EINVAL;
+ }
+}
+
+static int mcp9600_read_avail(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ const int **vals, int *type, int *length,
+ long mask)
+{
+ switch (mask) {
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+ *vals = mcp_iir_coefficients_avail;
+ *type = IIO_VAL_INT;
+ *length = ARRAY_SIZE(mcp_iir_coefficients_avail);
+ return IIO_AVAIL_LIST;
default:
return -EINVAL;
}
@@ -211,6 +243,7 @@ static int mcp9600_config(struct mcp9600_data *data)
cfg = FIELD_PREP(MCP9600_SENSOR_TYPE_MASK,
mcp9600_type_map[data->thermocouple_type]);
+ FIELD_MODIFY(MCP9600_FILTER_MASK, &cfg, data->filter_level);
ret = i2c_smbus_write_byte_data(client, MCP9600_SENSOR_CFG, cfg);
if (ret < 0) {
@@ -221,6 +254,43 @@ static int mcp9600_config(struct mcp9600_data *data)
return 0;
}
+static int mcp9600_write_raw_get_fmt(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ long mask)
+{
+ switch (mask) {
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+ return IIO_VAL_INT;
+ default:
+ return -EINVAL;
+ }
+}
+
+static int mcp9600_write_raw(struct iio_dev *indio_dev,
+ struct iio_chan_spec const *chan,
+ int val, int val2, long mask)
+{
+ struct mcp9600_data *data = iio_priv(indio_dev);
+ int i;
+
+ switch (mask) {
+ case IIO_CHAN_INFO_LOW_PASS_FILTER_3DB_FREQUENCY:
+ for (i = 0; i < ARRAY_SIZE(mcp_iir_coefficients_avail); i++) {
+ if (mcp_iir_coefficients_avail[i] == val)
+ break;
+ }
+
+ if (i == ARRAY_SIZE(mcp_iir_coefficients_avail))
+ return -EINVAL;
+
+ data->filter_level = i;
+ return mcp9600_config(data);
+
+ default:
+ return -EINVAL;
+ }
+}
+
static int mcp9600_get_alert_index(int channel2, enum iio_event_direction dir)
{
if (channel2 == IIO_MOD_TEMP_AMBIENT) {
@@ -358,6 +428,9 @@ static int mcp9600_write_thresh(struct iio_dev *indio_dev,
static const struct iio_info mcp9600_info = {
.read_raw = mcp9600_read_raw,
+ .read_avail = mcp9600_read_avail,
+ .write_raw = mcp9600_write_raw,
+ .write_raw_get_fmt = mcp9600_write_raw_get_fmt,
.read_event_config = mcp9600_read_event_config,
.write_event_config = mcp9600_write_event_config,
.read_event_value = mcp9600_read_thresh,
--
2.50.1
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