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Fri, 15 Aug 2025 03:02:07 -0700 (PDT) Received: from [127.0.1.1] ([185.177.137.147]) by smtp.gmail.com with ESMTPSA id a640c23a62f3a-afcdce72d5dsm119031766b.37.2025.08.15.03.02.07 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 15 Aug 2025 03:02:07 -0700 (PDT) From: Yusuf Alper Bilgin Date: Fri, 15 Aug 2025 12:02:03 +0200 Subject: [PATCH v4 2/3] iio: adc: ltc2497: add support for LTC2495 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250815-ltc2495-v4-2-2d04e6005468@gmail.com> References: <20250815-ltc2495-v4-0-2d04e6005468@gmail.com> In-Reply-To: <20250815-ltc2495-v4-0-2d04e6005468@gmail.com> To: Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , David Lechner , =?utf-8?q?Nuno_S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Liam Beguin Cc: Michael Hennerich , linux-iio@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Yusuf Alper Bilgin X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1755252124; l=11228; i=y.alperbilgin@gmail.com; s=20250811; h=from:subject:message-id; bh=JEUYQMGsKw802pSrUBvEuSI6h9jXfzKKuLQpTzQit14=; b=FpyzVFnqSN9I2xMWDHD4ySB7M+6A5VgSikbaFoJmGW7c5KIRxsBLkCfjisJAd/Ym90jYLYJg9 gTDcqrZqTLdD0Wi8+x5KR1oSc2gqhXPaGoibs33imDo0N5wDFPomQyu X-Developer-Key: i=y.alperbilgin@gmail.com; a=ed25519; pk=FtW2oyQ0+xlYU0XmhYiJYC3lNPtPrgeE6i4WXPwaFnY= Update the LTC2497 driver to also support the LTC2495. Support for reading the internal temperature sensor on LTC2495 and LTC2499 via a standard IIO temperature channel. Signed-off-by: Yusuf Alper Bilgin --- drivers/iio/adc/ltc2497-core.c | 132 ++++++++++++++++++++++++++++---------= ---- drivers/iio/adc/ltc2497.c | 39 +++++++++++- drivers/iio/adc/ltc2497.h | 11 ++++ 3 files changed, 140 insertions(+), 42 deletions(-) diff --git a/drivers/iio/adc/ltc2497-core.c b/drivers/iio/adc/ltc2497-core.c index 2dc5c704426949a4ec62c42591d6c2c40ffb79cc..9f3509c5974dd7a0489145c5916= 30e1ff9dc333e 100644 --- a/drivers/iio/adc/ltc2497-core.c +++ b/drivers/iio/adc/ltc2497-core.c @@ -12,6 +12,7 @@ #include #include #include +#include =20 #include "ltc2497.h" =20 @@ -46,7 +47,8 @@ static int ltc2497core_wait_conv(struct ltc2497core_drive= rdata *ddata) return 1; } =20 -static int ltc2497core_read(struct ltc2497core_driverdata *ddata, u8 addre= ss, int *val) +static int ltc2497core_read(struct ltc2497core_driverdata *ddata, u8 addre= ss, + enum iio_chan_type type, int *val) { int ret; =20 @@ -54,11 +56,13 @@ static int ltc2497core_read(struct ltc2497core_driverda= ta *ddata, u8 address, in if (ret < 0) return ret; =20 - if (ret || ddata->addr_prev !=3D address) { + if (ret || ddata->addr_prev !=3D address || + ddata->chan_type_prev !=3D type) { ret =3D ddata->result_and_measure(ddata, address, NULL); if (ret < 0) return ret; ddata->addr_prev =3D address; + ddata->chan_type_prev =3D type; =20 if (msleep_interruptible(LTC2497_CONVERSION_TIME_MS)) return -ERESTARTSYS; @@ -83,7 +87,7 @@ static int ltc2497core_read_raw(struct iio_dev *indio_dev, switch (mask) { case IIO_CHAN_INFO_RAW: mutex_lock(&ddata->lock); - ret =3D ltc2497core_read(ddata, chan->address, val); + ret =3D ltc2497core_read(ddata, chan->address, chan->type, val); mutex_unlock(&ddata->lock); if (ret < 0) return ret; @@ -95,10 +99,37 @@ static int ltc2497core_read_raw(struct iio_dev *indio_d= ev, if (ret < 0) return ret; =20 - *val =3D ret / 1000; - *val2 =3D ddata->chip_info->resolution + 1; + switch (chan->type) { + case IIO_VOLTAGE: + *val =3D ret / 1000; + *val2 =3D ddata->chip_info->resolution + 1; =20 - return IIO_VAL_FRACTIONAL_LOG2; + return IIO_VAL_FRACTIONAL_LOG2; + + case IIO_TEMP: + if (!ddata->chip_info->has_temp_channel) + return -EINVAL; + + *val =3D ret; + *val2 =3D ddata->chip_info->temp_scale_mV; + + return IIO_VAL_FRACTIONAL; + + default: + return -EINVAL; + } + case IIO_CHAN_INFO_OFFSET: + if (chan->type !=3D IIO_TEMP) + return -EINVAL; + + ret =3D regulator_get_voltage(ddata->ref); + if (ret < 0) + return ret; + + *val =3D kelvin_to_celsius(0) * ddata->chip_info->temp_scale_mV; + *val2 =3D ret / 1000; + + return IIO_VAL_FRACTIONAL; =20 default: return -EINVAL; @@ -126,39 +157,54 @@ static int ltc2497core_read_raw(struct iio_dev *indio= _dev, .differential =3D 1, \ } =20 +#define LTC2497_TEMPERATURE_CHAN \ +{ \ + .type =3D IIO_TEMP, \ + .info_mask_separate =3D BIT(IIO_CHAN_INFO_RAW), \ + .info_mask_shared_by_type =3D BIT(IIO_CHAN_INFO_SCALE) | BIT(IIO_CHAN_INF= O_OFFSET), \ +} + +#define LTC2497_VOLTAGE_CHANNEL_LIST \ + LTC2497_CHAN(0, LTC2497_SGL, "CH0"), \ + LTC2497_CHAN(1, LTC2497_SGL, "CH1"), \ + LTC2497_CHAN(2, LTC2497_SGL, "CH2"), \ + LTC2497_CHAN(3, LTC2497_SGL, "CH3"), \ + LTC2497_CHAN(4, LTC2497_SGL, "CH4"), \ + LTC2497_CHAN(5, LTC2497_SGL, "CH5"), \ + LTC2497_CHAN(6, LTC2497_SGL, "CH6"), \ + LTC2497_CHAN(7, LTC2497_SGL, "CH7"), \ + LTC2497_CHAN(8, LTC2497_SGL, "CH8"), \ + LTC2497_CHAN(9, LTC2497_SGL, "CH9"), \ + LTC2497_CHAN(10, LTC2497_SGL, "CH10"), \ + LTC2497_CHAN(11, LTC2497_SGL, "CH11"), \ + LTC2497_CHAN(12, LTC2497_SGL, "CH12"), \ + LTC2497_CHAN(13, LTC2497_SGL, "CH13"), \ + LTC2497_CHAN(14, LTC2497_SGL, "CH14"), \ + LTC2497_CHAN(15, LTC2497_SGL, "CH15"), \ + LTC2497_CHAN_DIFF(0, LTC2497_DIFF), \ + LTC2497_CHAN_DIFF(1, LTC2497_DIFF), \ + LTC2497_CHAN_DIFF(2, LTC2497_DIFF), \ + LTC2497_CHAN_DIFF(3, LTC2497_DIFF), \ + LTC2497_CHAN_DIFF(4, LTC2497_DIFF), \ + LTC2497_CHAN_DIFF(5, LTC2497_DIFF), \ + LTC2497_CHAN_DIFF(6, LTC2497_DIFF), \ + LTC2497_CHAN_DIFF(7, LTC2497_DIFF), \ + LTC2497_CHAN_DIFF(0, LTC2497_DIFF | LTC2497_SIGN), \ + LTC2497_CHAN_DIFF(1, LTC2497_DIFF | LTC2497_SIGN), \ + LTC2497_CHAN_DIFF(2, LTC2497_DIFF | LTC2497_SIGN), \ + LTC2497_CHAN_DIFF(3, LTC2497_DIFF | LTC2497_SIGN), \ + LTC2497_CHAN_DIFF(4, LTC2497_DIFF | LTC2497_SIGN), \ + LTC2497_CHAN_DIFF(5, LTC2497_DIFF | LTC2497_SIGN), \ + LTC2497_CHAN_DIFF(6, LTC2497_DIFF | LTC2497_SIGN), \ + LTC2497_CHAN_DIFF(7, LTC2497_DIFF | LTC2497_SIGN) + static const struct iio_chan_spec ltc2497core_channel[] =3D { - LTC2497_CHAN(0, LTC2497_SGL, "CH0"), - LTC2497_CHAN(1, LTC2497_SGL, "CH1"), - LTC2497_CHAN(2, LTC2497_SGL, "CH2"), - LTC2497_CHAN(3, LTC2497_SGL, "CH3"), - LTC2497_CHAN(4, LTC2497_SGL, "CH4"), - LTC2497_CHAN(5, LTC2497_SGL, "CH5"), - LTC2497_CHAN(6, LTC2497_SGL, "CH6"), - LTC2497_CHAN(7, LTC2497_SGL, "CH7"), - LTC2497_CHAN(8, LTC2497_SGL, "CH8"), - LTC2497_CHAN(9, LTC2497_SGL, "CH9"), - LTC2497_CHAN(10, LTC2497_SGL, "CH10"), - LTC2497_CHAN(11, LTC2497_SGL, "CH11"), - LTC2497_CHAN(12, LTC2497_SGL, "CH12"), - LTC2497_CHAN(13, LTC2497_SGL, "CH13"), - LTC2497_CHAN(14, LTC2497_SGL, "CH14"), - LTC2497_CHAN(15, LTC2497_SGL, "CH15"), - LTC2497_CHAN_DIFF(0, LTC2497_DIFF), - LTC2497_CHAN_DIFF(1, LTC2497_DIFF), - LTC2497_CHAN_DIFF(2, LTC2497_DIFF), - LTC2497_CHAN_DIFF(3, LTC2497_DIFF), - LTC2497_CHAN_DIFF(4, LTC2497_DIFF), - LTC2497_CHAN_DIFF(5, LTC2497_DIFF), - LTC2497_CHAN_DIFF(6, LTC2497_DIFF), - LTC2497_CHAN_DIFF(7, LTC2497_DIFF), - LTC2497_CHAN_DIFF(0, LTC2497_DIFF | LTC2497_SIGN), - LTC2497_CHAN_DIFF(1, LTC2497_DIFF | LTC2497_SIGN), - LTC2497_CHAN_DIFF(2, LTC2497_DIFF | LTC2497_SIGN), - LTC2497_CHAN_DIFF(3, LTC2497_DIFF | LTC2497_SIGN), - LTC2497_CHAN_DIFF(4, LTC2497_DIFF | LTC2497_SIGN), - LTC2497_CHAN_DIFF(5, LTC2497_DIFF | LTC2497_SIGN), - LTC2497_CHAN_DIFF(6, LTC2497_DIFF | LTC2497_SIGN), - LTC2497_CHAN_DIFF(7, LTC2497_DIFF | LTC2497_SIGN), + LTC2497_VOLTAGE_CHANNEL_LIST, +}; + +static const struct iio_chan_spec ltc2497core_channel_with_temperature[] = =3D { + LTC2497_VOLTAGE_CHANNEL_LIST, + LTC2497_TEMPERATURE_CHAN, }; =20 static const struct iio_info ltc2497core_info =3D { @@ -182,8 +228,14 @@ int ltc2497core_probe(struct device *dev, struct iio_d= ev *indio_dev) =20 indio_dev->info =3D <c2497core_info; indio_dev->modes =3D INDIO_DIRECT_MODE; - indio_dev->channels =3D ltc2497core_channel; - indio_dev->num_channels =3D ARRAY_SIZE(ltc2497core_channel); + + if (ddata->chip_info->has_temp_channel) { + indio_dev->channels =3D ltc2497core_channel_with_temperature; + indio_dev->num_channels =3D ARRAY_SIZE(ltc2497core_channel_with_temperat= ure); + } else { + indio_dev->channels =3D ltc2497core_channel; + indio_dev->num_channels =3D ARRAY_SIZE(ltc2497core_channel); + } =20 ret =3D ddata->result_and_measure(ddata, LTC2497_CONFIG_DEFAULT, NULL); if (ret < 0) diff --git a/drivers/iio/adc/ltc2497.c b/drivers/iio/adc/ltc2497.c index eb9d521e86e54def0493ea0e81f63b37900c56a5..cd3d00a8ffcb44107c9ad948913= c97db9412b5f5 100644 --- a/drivers/iio/adc/ltc2497.c +++ b/drivers/iio/adc/ltc2497.c @@ -18,7 +18,12 @@ =20 #include "ltc2497.h" =20 +/* Optional second byte fields for LTC2495 and LTC2499 */ +#define LTC2497_EN2 BIT(7) +#define LTC2497_IM BIT(6) + enum ltc2497_chip_type { + TYPE_LTC2495, TYPE_LTC2497, TYPE_LTC2499, }; @@ -85,8 +90,28 @@ static int ltc2497_result_and_measure(struct ltc2497core= _driverdata *ddata, return 0; } =20 - ret =3D i2c_smbus_write_byte(st->client, - LTC2497_ENABLE | address); + /* + * Chips with temperature sensor support (e.g., LTC2495/LTC2499) + * require a two-byte command format to select any channel. + * + * To read the internal temperature, LTC2497_EN2 and LTC2497_IM + * are sent as the second byte. To read a voltage channel, LTC2497_EN2 + * is sent, which sets the default configuration: simultaneous 50/60Hz + * rejection, 1x speed, and gain=3D1. + * + * Chips without this feature use a standard single-byte command. + */ + if (ddata->chip_info->has_temp_channel) { + if (ddata->chan_type_prev =3D=3D IIO_TEMP) + ret =3D i2c_smbus_write_byte_data(st->client, LTC2497_ENABLE, + LTC2497_EN2 | LTC2497_IM); + else + ret =3D i2c_smbus_write_byte_data(st->client, LTC2497_ENABLE | address, + LTC2497_EN2); + } else { + ret =3D i2c_smbus_write_byte(st->client, LTC2497_ENABLE | address); + } + if (ret) dev_err(&st->client->dev, "i2c transfer failed: %pe\n", ERR_PTR(ret)); @@ -131,6 +156,12 @@ static void ltc2497_remove(struct i2c_client *client) } =20 static const struct ltc2497_chip_info ltc2497_info[] =3D { + [TYPE_LTC2495] =3D { + .resolution =3D 16, + .name =3D "ltc2495", + .has_temp_channel =3D true, + .temp_scale_mV =3D 12250, + }, [TYPE_LTC2497] =3D { .resolution =3D 16, .name =3D NULL, @@ -138,10 +169,13 @@ static const struct ltc2497_chip_info ltc2497_info[] = =3D { [TYPE_LTC2499] =3D { .resolution =3D 24, .name =3D "ltc2499", + .has_temp_channel =3D true, + .temp_scale_mV =3D 1570000, }, }; =20 static const struct i2c_device_id ltc2497_id[] =3D { + { "ltc2495", (kernel_ulong_t)<c2497_info[TYPE_LTC2495] }, { "ltc2497", (kernel_ulong_t)<c2497_info[TYPE_LTC2497] }, { "ltc2499", (kernel_ulong_t)<c2497_info[TYPE_LTC2499] }, { } @@ -149,6 +183,7 @@ static const struct i2c_device_id ltc2497_id[] =3D { MODULE_DEVICE_TABLE(i2c, ltc2497_id); =20 static const struct of_device_id ltc2497_of_match[] =3D { + { .compatible =3D "lltc,ltc2495", .data =3D <c2497_info[TYPE_LTC2495] }, { .compatible =3D "lltc,ltc2497", .data =3D <c2497_info[TYPE_LTC2497] }, { .compatible =3D "lltc,ltc2499", .data =3D <c2497_info[TYPE_LTC2499] }, { } diff --git a/drivers/iio/adc/ltc2497.h b/drivers/iio/adc/ltc2497.h index 64e81c95a3dd05911b6717c09ac0560c9f47f304..dfe2d5c30017adeb3f17e57fc5b= f1e0e792ff30f 100644 --- a/drivers/iio/adc/ltc2497.h +++ b/drivers/iio/adc/ltc2497.h @@ -7,6 +7,16 @@ struct ltc2497_chip_info { u32 resolution; const char *name; + /* + * Represents the datasheet constant from the temperature formula: + * T_Kelvin =3D (DATAOUT * Vref) / temp_scale, where Vref is in Volts. + * + * To allow the driver to use Vref in millivolts for the calculation + * and also to avoid floating points, this stored value represents the + * datasheet constant scaled by 1000. + */ + u32 temp_scale_mV; + bool has_temp_channel; }; =20 struct ltc2497core_driverdata { @@ -18,6 +28,7 @@ struct ltc2497core_driverdata { u8 addr_prev; int (*result_and_measure)(struct ltc2497core_driverdata *ddata, u8 address, int *val); + enum iio_chan_type chan_type_prev; }; =20 int ltc2497core_probe(struct device *dev, struct iio_dev *indio_dev); --=20 2.43.0