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[90.1.180.114]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-434aa7e5e59sm181138325e9.44.2024.12.02.02.14.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 02 Dec 2024 02:14:27 -0800 (PST) From: Guillaume Ranquet Date: Mon, 02 Dec 2024 11:09:52 +0100 Subject: [PATCH v3 1/2] iio: adc: ad7173: add calibration support 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: <20241202-ad411x_calibration-v3-1-beb6aeec39e2@baylibre.com> References: <20241202-ad411x_calibration-v3-0-beb6aeec39e2@baylibre.com> In-Reply-To: <20241202-ad411x_calibration-v3-0-beb6aeec39e2@baylibre.com> To: Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron Cc: linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, Guillaume Ranquet X-Mailer: b4 0.15-dev The ad7173 family of chips has up to four calibration modes. Internal zero scale: removes ADC core offset errors. Internal full scale: removes ADC core gain errors. System zero scale: reduces offset error to the order of channel noise. System full scale: reduces gain error to the order of channel noise. All voltage channels will undergo an internal zero/full scale calibration at bootup. System zero/full scale can be done after bootup using the newly created iio interface 'sys_calibration' and 'sys_calibration_mode' Signed-off-by: Guillaume Ranquet --- drivers/iio/adc/ad7173.c | 116 +++++++++++++++++++++++++++++++++++++++++++= ++++ 1 file changed, 116 insertions(+) diff --git a/drivers/iio/adc/ad7173.c b/drivers/iio/adc/ad7173.c index a0fca16c3be07534547a5b914d525d05f7425340..5e711b9c80840547bcfa2ad8f5f= c8e15c1acc5d2 100644 --- a/drivers/iio/adc/ad7173.c +++ b/drivers/iio/adc/ad7173.c @@ -150,6 +150,11 @@ #define AD7173_FILTER_ODR0_MASK GENMASK(5, 0) #define AD7173_MAX_CONFIGS 8 =20 +#define AD7173_MODE_CAL_INT_ZERO 0x4 /* Internal Zero-Scale Calibration */ +#define AD7173_MODE_CAL_INT_FULL 0x5 /* Internal Full-Scale Calibration */ +#define AD7173_MODE_CAL_SYS_ZERO 0x6 /* System Zero-Scale Calibration */ +#define AD7173_MODE_CAL_SYS_FULL 0x7 /* System Full-Scale Calibration */ + struct ad7173_device_info { const unsigned int *sinc5_data_rates; unsigned int num_sinc5_data_rates; @@ -175,6 +180,7 @@ struct ad7173_device_info { bool has_input_buf; bool has_int_ref; bool has_ref2; + bool has_internal_fs_calibration; bool higher_gpio_bits; u8 num_gpios; }; @@ -196,6 +202,7 @@ struct ad7173_channel { unsigned int chan_reg; unsigned int ain; struct ad7173_channel_config cfg; + u8 syscalib_mode; }; =20 struct ad7173_state { @@ -272,6 +279,7 @@ static const struct ad7173_device_info ad4111_device_in= fo =3D { .has_input_buf =3D true, .has_current_inputs =3D true, .has_int_ref =3D true, + .has_internal_fs_calibration =3D true, .clock =3D 2 * HZ_PER_MHZ, .sinc5_data_rates =3D ad7173_sinc5_data_rates, .num_sinc5_data_rates =3D ARRAY_SIZE(ad7173_sinc5_data_rates), @@ -291,6 +299,7 @@ static const struct ad7173_device_info ad4112_device_in= fo =3D { .has_input_buf =3D true, .has_current_inputs =3D true, .has_int_ref =3D true, + .has_internal_fs_calibration =3D true, .clock =3D 2 * HZ_PER_MHZ, .sinc5_data_rates =3D ad7173_sinc5_data_rates, .num_sinc5_data_rates =3D ARRAY_SIZE(ad7173_sinc5_data_rates), @@ -326,6 +335,7 @@ static const struct ad7173_device_info ad4114_device_in= fo =3D { .has_temp =3D true, .has_input_buf =3D true, .has_int_ref =3D true, + .has_internal_fs_calibration =3D true, .clock =3D 2 * HZ_PER_MHZ, .sinc5_data_rates =3D ad7173_sinc5_data_rates, .num_sinc5_data_rates =3D ARRAY_SIZE(ad7173_sinc5_data_rates), @@ -343,6 +353,7 @@ static const struct ad7173_device_info ad4115_device_in= fo =3D { .has_temp =3D true, .has_input_buf =3D true, .has_int_ref =3D true, + .has_internal_fs_calibration =3D true, .clock =3D 8 * HZ_PER_MHZ, .sinc5_data_rates =3D ad4115_sinc5_data_rates, .num_sinc5_data_rates =3D ARRAY_SIZE(ad4115_sinc5_data_rates), @@ -360,6 +371,7 @@ static const struct ad7173_device_info ad4116_device_in= fo =3D { .has_temp =3D true, .has_input_buf =3D true, .has_int_ref =3D true, + .has_internal_fs_calibration =3D true, .clock =3D 4 * HZ_PER_MHZ, .sinc5_data_rates =3D ad4116_sinc5_data_rates, .num_sinc5_data_rates =3D ARRAY_SIZE(ad4116_sinc5_data_rates), @@ -505,6 +517,105 @@ static const struct regmap_config ad7173_regmap_confi= g =3D { .read_flag_mask =3D BIT(6), }; =20 +enum { + AD7173_SYSCALIB_ZERO_SCALE, + AD7173_SYSCALIB_FULL_SCALE, +}; + +static const char * const ad7173_syscalib_modes[] =3D { + [AD7173_SYSCALIB_ZERO_SCALE] =3D "zero_scale", + [AD7173_SYSCALIB_FULL_SCALE] =3D "full_scale", +}; + +static int ad7173_set_syscalib_mode(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan, + unsigned int mode) +{ + struct ad7173_state *st =3D iio_priv(indio_dev); + + st->channels[chan->channel].syscalib_mode =3D mode; + + return 0; +} + +static int ad7173_get_syscalib_mode(struct iio_dev *indio_dev, + const struct iio_chan_spec *chan) +{ + struct ad7173_state *st =3D iio_priv(indio_dev); + + return st->channels[chan->channel].syscalib_mode; +} + +static ssize_t ad7173_write_syscalib(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, + const char *buf, size_t len) +{ + struct ad7173_state *st =3D iio_priv(indio_dev); + bool sys_calib; + int ret, mode; + + ret =3D kstrtobool(buf, &sys_calib); + if (ret) + return ret; + + mode =3D st->channels[chan->channel].syscalib_mode; + if (sys_calib) { + if (mode =3D=3D AD7173_SYSCALIB_ZERO_SCALE) + ret =3D ad_sd_calibrate(&st->sd, AD7173_MODE_CAL_SYS_ZERO, + chan->address); + else + ret =3D ad_sd_calibrate(&st->sd, AD7173_MODE_CAL_SYS_FULL, + chan->address); + } + + return ret ? : len; +} + +static const struct iio_enum ad7173_syscalib_mode_enum =3D { + .items =3D ad7173_syscalib_modes, + .num_items =3D ARRAY_SIZE(ad7173_syscalib_modes), + .set =3D ad7173_set_syscalib_mode, + .get =3D ad7173_get_syscalib_mode +}; + +static const struct iio_chan_spec_ext_info ad7173_calibsys_ext_info[] =3D { + { + .name =3D "sys_calibration", + .write =3D ad7173_write_syscalib, + .shared =3D IIO_SEPARATE, + }, + IIO_ENUM("sys_calibration_mode", IIO_SEPARATE, + &ad7173_syscalib_mode_enum), + IIO_ENUM_AVAILABLE("sys_calibration_mode", IIO_SHARED_BY_TYPE, + &ad7173_syscalib_mode_enum), + { } +}; + +static int ad7173_calibrate_all(struct ad7173_state *st, struct iio_dev *i= ndio_dev) +{ + int ret; + int i; + + for (i =3D 0; i < st->num_channels; i++) { + if (indio_dev->channels[i].type !=3D IIO_VOLTAGE) + continue; + + ret =3D ad_sd_calibrate(&st->sd, AD7173_MODE_CAL_INT_ZERO, st->channels[= i].ain); + if (ret < 0) + return ret; + + if (st->info->has_internal_fs_calibration) { + ret =3D ad_sd_calibrate(&st->sd, AD7173_MODE_CAL_INT_FULL, + st->channels[i].ain); + if (ret < 0) + return ret; + } + } + + return 0; +} + static int ad7173_mask_xlate(struct gpio_regmap *gpio, unsigned int base, unsigned int offset, unsigned int *reg, unsigned int *mask) @@ -801,6 +912,10 @@ static int ad7173_setup(struct iio_dev *indio_dev) if (!st->config_cnts) return -ENOMEM; =20 + ret =3D ad7173_calibrate_all(st, indio_dev); + if (ret) + return ret; + /* All channels are enabled by default after a reset */ return ad7173_disable_all(&st->sd); } @@ -1023,6 +1138,7 @@ static const struct iio_chan_spec ad7173_channel_temp= late =3D { .storagebits =3D 32, .endianness =3D IIO_BE, }, + .ext_info =3D ad7173_calibsys_ext_info, }; =20 static const struct iio_chan_spec ad7173_temp_iio_channel_template =3D { --=20 2.47.0