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From: Ben Collins To: Jonathan Cameron , David Lechner , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko Cc: Ben Collins , linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 4/5] iio: mcp9600: Add support for thermocouple-type Date: Fri, 15 Aug 2025 16:46:06 +0000 Message-ID: <20250815164627.22002-5-bcollins@watter.com> In-Reply-To: <20250815164627.22002-1-bcollins@watter.com> References: <20250815164627.22002-1-bcollins@watter.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" dt-bindings documentation for this driver claims to support thermocouple-type, but the driver does not actually make use of the property. Implement usage of the property to configure the chip for the selected thermocouple-type. Signed-off-by: Ben Collins --- drivers/iio/temperature/mcp9600.c | 69 +++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) diff --git a/drivers/iio/temperature/mcp9600.c b/drivers/iio/temperature/mc= p9600.c index c18ae17b6d82f..361572a241f06 100644 --- a/drivers/iio/temperature/mcp9600.c +++ b/drivers/iio/temperature/mcp9600.c @@ -22,11 +22,15 @@ #include #include =20 +#include + /* MCP9600 registers */ #define MCP9600_HOT_JUNCTION 0x00 #define MCP9600_COLD_JUNCTION 0x02 #define MCP9600_STATUS 0x04 #define MCP9600_STATUS_ALERT(x) BIT(x) +#define MCP9600_SENSOR_CFG 0x05 +#define MCP9600_SENSOR_TYPE_MASK GENMASK(6, 4) #define MCP9600_ALERT_CFG1 0x08 #define MCP9600_ALERT_CFG(x) (MCP9600_ALERT_CFG1 + (x - 1)) #define MCP9600_ALERT_CFG_ENABLE BIT(0) @@ -66,6 +70,30 @@ static const char * const mcp9600_alert_name[MCP9600_ALE= RT_COUNT] =3D { [MCP9600_ALERT4] =3D "alert4", }; =20 +/* Map between dt-bindings enum and the chip's type value */ +static const unsigned int mcp9600_type_map[] =3D { + [THERMOCOUPLE_TYPE_K] =3D 0, + [THERMOCOUPLE_TYPE_J] =3D 1, + [THERMOCOUPLE_TYPE_T] =3D 2, + [THERMOCOUPLE_TYPE_N] =3D 3, + [THERMOCOUPLE_TYPE_S] =3D 4, + [THERMOCOUPLE_TYPE_E] =3D 5, + [THERMOCOUPLE_TYPE_B] =3D 6, + [THERMOCOUPLE_TYPE_R] =3D 7, +}; + +/* Map thermocouple type to a char for for iio info in sysfs */ +static const int mcp9600_tc_types[] =3D { + [THERMOCOUPLE_TYPE_K] =3D 'K', + [THERMOCOUPLE_TYPE_J] =3D 'J', + [THERMOCOUPLE_TYPE_T] =3D 'T', + [THERMOCOUPLE_TYPE_N] =3D 'N', + [THERMOCOUPLE_TYPE_S] =3D 'S', + [THERMOCOUPLE_TYPE_E] =3D 'E', + [THERMOCOUPLE_TYPE_B] =3D 'B', + [THERMOCOUPLE_TYPE_R] =3D 'R', +}; + static const struct iio_event_spec mcp9600_events[] =3D { { .type =3D IIO_EV_TYPE_THRESH, @@ -89,6 +117,7 @@ static const struct iio_event_spec mcp9600_events[] =3D { .type =3D IIO_TEMP, \ .address =3D MCP9600_HOT_JUNCTION, \ .info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW) | \ + BIT(IIO_CHAN_INFO_THERMOCOUPLE_TYPE) | \ BIT(IIO_CHAN_INFO_SCALE), \ .event_spec =3D &mcp9600_events[hj_ev_spec_off], \ .num_event_specs =3D hj_num_ev, \ @@ -131,6 +160,7 @@ struct mcp_chip_info { =20 struct mcp9600_data { struct i2c_client *client; + u32 thermocouple_type; }; =20 static int mcp9600_read(struct mcp9600_data *data, @@ -165,11 +195,32 @@ static int mcp9600_read_raw(struct iio_dev *indio_dev, *val =3D 62; *val2 =3D 500000; return IIO_VAL_INT_PLUS_MICRO; + case IIO_CHAN_INFO_THERMOCOUPLE_TYPE: + *val =3D mcp9600_tc_types[data->thermocouple_type]; + return IIO_VAL_CHAR; default: return -EINVAL; } } =20 +static int mcp9600_config(struct mcp9600_data *data) +{ + struct i2c_client *client =3D data->client; + int ret; + u8 cfg; + + cfg =3D FIELD_PREP(MCP9600_SENSOR_TYPE_MASK, + mcp9600_type_map[data->thermocouple_type]); + + ret =3D i2c_smbus_write_byte_data(client, MCP9600_SENSOR_CFG, cfg); + if (ret < 0) { + dev_err(&client->dev, "Failed to set sensor configuration\n"); + return ret; + } + + return 0; +} + static int mcp9600_get_alert_index(int channel2, enum iio_event_direction = dir) { if (channel2 =3D=3D IIO_MOD_TEMP_AMBIENT) { @@ -453,6 +504,24 @@ static int mcp9600_probe(struct i2c_client *client) data =3D iio_priv(indio_dev); data->client =3D client; =20 + /* Accept type from dt with default of Type-K. */ + data->thermocouple_type =3D THERMOCOUPLE_TYPE_K; + ret =3D device_property_read_u32(&client->dev, "thermocouple-type", + &data->thermocouple_type); + if (ret < 0 && ret !=3D -EINVAL) + return dev_err_probe(&client->dev, ret, + "Error reading thermocouple-type property\n"); + + if (data->thermocouple_type >=3D ARRAY_SIZE(mcp9600_type_map)) + return dev_err_probe(&client->dev, -EINVAL, + "Invalid thermocouple-type property %u.\n", + data->thermocouple_type); + + /* Set initial config. */ + ret =3D mcp9600_config(data); + if (ret < 0) + return ret; + ch_sel =3D mcp9600_probe_alerts(indio_dev); if (ch_sel < 0) return ch_sel; --=20 2.50.1