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Tue, 09 Dec 2025 09:59:38 -0800 (PST) Received: from localhost.localdomain ([78.212.211.11]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-42f7cbe9065sm32726241f8f.8.2025.12.09.09.59.37 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 09 Dec 2025 09:59:38 -0800 (PST) From: Antoni Pokusinski To: jdelvare@suse.com, linux@roeck-us.net, corbet@lwn.net Cc: linux-hwmon@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, Antoni Pokusinski Subject: [PATCH] hwmon: (sht3x) add support for SHT85 Date: Tue, 9 Dec 2025 18:58:49 +0100 Message-Id: <20251209175848.5739-1-apokusinski01@gmail.com> X-Mailer: git-send-email 2.25.1 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 Content-Type: text/plain; charset="utf-8" SHT85 is a temperature and humidity sensor with an interface very similar to SHT3x. However, it does not feature alerts (and therefore limits). Signed-off-by: Antoni Pokusinski --- Documentation/hwmon/sht3x.rst | 11 ++++++++++- drivers/hwmon/sht3x.c | 26 +++++++++++++++++--------- 2 files changed, 27 insertions(+), 10 deletions(-) diff --git a/Documentation/hwmon/sht3x.rst b/Documentation/hwmon/sht3x.rst index 9585fa7c5a5d..25c7428f0a77 100644 --- a/Documentation/hwmon/sht3x.rst +++ b/Documentation/hwmon/sht3x.rst @@ -23,6 +23,15 @@ Supported chips: - https://sensirion.com/media/documents/1DA31AFD/61641F76/Sensirio= n_Temperature_Sensors_STS3x_Datasheet.pdf - https://sensirion.com/media/documents/292A335C/65537BAF/Sensirio= n_Datasheet_STS32_STS33.pdf =20 + * Sensirion SHT85 + + Prefix: 'sht85' + + Addresses scanned: none + + Datasheets: + - https://sensirion.com/media/documents/4B40CEF3/640B2346/Sensirio= n_Humidity_Sensors_SHT85_Datasheet.pdf + Author: =20 - David Frey @@ -31,7 +40,7 @@ Author: Description ----------- =20 -This driver implements support for the Sensirion SHT3x-DIS and STS3x-DIS +This driver implements support for the Sensirion SHT3x-DIS, STS3x-DIS and = SHT85 series of humidity and temperature sensors. Temperature is measured in deg= rees celsius, relative humidity is expressed as a percentage. In the sysfs inte= rface, all values are scaled by 1000, i.e. the value for 31.5 degrees celsius is = 31500. diff --git a/drivers/hwmon/sht3x.c b/drivers/hwmon/sht3x.c index f36c0229328f..eff915d31452 100644 --- a/drivers/hwmon/sht3x.c +++ b/drivers/hwmon/sht3x.c @@ -63,6 +63,7 @@ static const unsigned char sht3x_cmd_read_serial_number[]= =3D { 0x37, 0x80 }; enum sht3x_chips { sht3x, sts3x, + sht85, }; =20 enum sht3x_limits { @@ -668,6 +669,8 @@ static umode_t sht3x_is_visible(const void *data, enum = hwmon_sensor_types type, } break; case hwmon_temp: + if (chip_data->chip_id =3D=3D sht85 && attr !=3D hwmon_temp_input) + break; switch (attr) { case hwmon_temp_input: case hwmon_temp_alarm: @@ -684,6 +687,8 @@ static umode_t sht3x_is_visible(const void *data, enum = hwmon_sensor_types type, case hwmon_humidity: if (chip_data->chip_id =3D=3D sts3x) break; + if (chip_data->chip_id =3D=3D sht85 && attr !=3D hwmon_humidity_input) + break; switch (attr) { case hwmon_humidity_input: case hwmon_humidity_alarm: @@ -908,16 +913,18 @@ static int sht3x_probe(struct i2c_client *client) mutex_init(&data->i2c_lock); mutex_init(&data->data_lock); =20 - /* - * An attempt to read limits register too early - * causes a NACK response from the chip. - * Waiting for an empirical delay of 500 us solves the issue. - */ - usleep_range(500, 600); + if (data->chip_id =3D=3D sht3x || data->chip_id =3D=3D sts3x) { + /* + * An attempt to read limits register too early + * causes a NACK response from the chip. + * Waiting for an empirical delay of 500 us solves the issue. + */ + usleep_range(500, 600); =20 - ret =3D limits_update(data); - if (ret) - return ret; + ret =3D limits_update(data); + if (ret) + return ret; + } =20 hwmon_dev =3D devm_hwmon_device_register_with_info(dev, client->name, dat= a, &sht3x_chip_info, sht3x_groups); @@ -933,6 +940,7 @@ static int sht3x_probe(struct i2c_client *client) static const struct i2c_device_id sht3x_ids[] =3D { {"sht3x", sht3x}, {"sts3x", sts3x}, + {"sht85", sht85}, {} }; =20 --=20 2.25.1