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Wed, 4 Jun 2025 15:36:45 -0400 Received: from ASHBCASHYB4.ad.analog.com (10.64.17.132) by ASHBMBX8.ad.analog.com (10.64.17.5) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1748.10; Wed, 4 Jun 2025 15:36:45 -0400 Received: from ASHBMBX8.ad.analog.com (10.64.17.5) by ASHBCASHYB4.ad.analog.com (10.64.17.132) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1748.10; Wed, 4 Jun 2025 15:36:45 -0400 Received: from zeus.spd.analog.com (10.66.68.11) by ashbmbx8.ad.analog.com (10.64.17.5) with Microsoft SMTP Server id 15.2.1748.10 via Frontend Transport; Wed, 4 Jun 2025 15:36:45 -0400 Received: from JSANTO12-L01.ad.analog.com ([10.65.60.206]) by zeus.spd.analog.com (8.15.1/8.15.1) with ESMTP id 554JaVk7014328; Wed, 4 Jun 2025 15:36:33 -0400 From: Jonathan Santos To: , , , CC: Jonathan Santos , , , , , , , , , , , , , , , Subject: [PATCH v10 06/12] iio: adc: ad7768-1: add regulator to control VCM output Date: Wed, 4 Jun 2025 16:36:29 -0300 Message-ID: <008390cf0a63645d9e0cc85b4256e2e35433940d.1749063024.git.Jonathan.Santos@analog.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-gpio@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-GUID: 61S3vi4_y12Y9eB9y4nLo-xrD5_ZvscJ X-Authority-Analysis: v=2.4 cv=DfIXqutW c=1 sm=1 tr=0 ts=6840a04f cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=6IFa9wvqVegA:10 a=gAnH3GRIAAAA:8 a=IpJZQVW2AAAA:8 a=lA8crIeKp1-K9khhi1AA:9 a=IawgGOuG5U0WyFbmm1f5:22 X-Proofpoint-ORIG-GUID: 61S3vi4_y12Y9eB9y4nLo-xrD5_ZvscJ X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNjA0MDE1NSBTYWx0ZWRfX+RoFV/EAPcPY /vIwow0fxM/SC5jnqjdn1iGVSmY9IrPbUKxT5183T1c6SLQFcCcyeomad1hPmK1pgiSKvNhj9OP umbBXD4k6BxoNumSUiZ7K2vecJ88Q0KZRf+u7F166WVMHNuUTNhfQqJ96gG/89GWIn0sc7nGR9h 8eXLbN4MFC8BbMPhh8N1hxzatn6ZmiL9jVB39VjWuy7PmmPCzptZcaCqdha14jLkbEVEqBWnuIN elTj3mtEXrk8JxaxMqz2HpgLMK6t6HB3iCnKcvpJsIx6OsQF7fLFmKeOTixzT9h1GGeEtSDVE32 o+oxPvq9c1/d06YVspDFXfBpqTVAjsW38z8ED5N6A9NiAh9MV4TAEo5P7o2kbpYCSbnyZH16gsP 4jidri25FWzNooN/DEalxy4h9rYKiHR+TGjgTaI8SX6CuucEvuUD2NQ9LFLTY2ghY1nFN3or X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-06-04_04,2025-06-03_02,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 malwarescore=0 clxscore=1015 priorityscore=1501 suspectscore=0 adultscore=6 mlxlogscore=999 spamscore=0 impostorscore=0 phishscore=0 lowpriorityscore=0 bulkscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2506040155 The VCM output voltage can be used as a common-mode voltage within the amplifier preconditioning circuits external to the AD7768-1. This change allows the user to configure VCM output using the regulator framework. Acked-by: Marcelo Schmitt Reviewed-by: David Lechner Signed-off-by: Jonathan Santos --- v10 Changes: * None. v9 Changes: * None. v8 Changes: * None. v7 Changes: * removed dead code. * removed of.h header. * removed explicit casting in the clamp function. v6 Changes: * Rearranged iio_device_release_direct() calls to avoid some gotos. * removed of_match_ptr() from regulator_desc. * Addressed other nits. v5 Changes: * enforce AD7768_REG_ANALOG2_VCM macro argument evaluation. * switched to the new iio_device_claim/release_direct() functions. v4 Changes: * Added iio_device_claim_direct_mode() to regulator callbacks to avoid register access while in buffered mode. * Changed regulator name to "ad7768-1-vcm". * When regulator enable is called, it will set the last voltage selector configured. * Disabled regulator before configuring it. * Addressed other nits. v3 Changes: * Register VCM output via the regulator framework for improved flexibility and external integration. v2 Changes: * VCM output support is now defined by a devicetree property, instead of and IIO attribute. --- drivers/iio/adc/Kconfig | 1 + drivers/iio/adc/ad7768-1.c | 159 +++++++++++++++++++++++++++++++++++++ 2 files changed, 160 insertions(+) diff --git a/drivers/iio/adc/Kconfig b/drivers/iio/adc/Kconfig index 3bd03df9a976..c68918fb4cfe 100644 --- a/drivers/iio/adc/Kconfig +++ b/drivers/iio/adc/Kconfig @@ -344,6 +344,7 @@ config AD7766 config AD7768_1 tristate "Analog Devices AD7768-1 ADC driver" depends on SPI + select REGULATOR select REGMAP_SPI select IIO_BUFFER select IIO_TRIGGER diff --git a/drivers/iio/adc/ad7768-1.c b/drivers/iio/adc/ad7768-1.c index 8b414a102864..68f876e5d31c 100644 --- a/drivers/iio/adc/ad7768-1.c +++ b/drivers/iio/adc/ad7768-1.c @@ -13,9 +13,11 @@ #include #include #include +#include #include #include #include +#include #include #include @@ -82,6 +84,12 @@ #define AD7768_CONV_MODE_MSK GENMASK(2, 0) #define AD7768_CONV_MODE(x) FIELD_PREP(AD7768_CONV_MODE_MSK, x) +/* AD7768_REG_ANALOG2 */ +#define AD7768_REG_ANALOG2_VCM_MSK GENMASK(2, 0) +#define AD7768_REG_ANALOG2_VCM(x) FIELD_PREP(AD7768_REG_ANALOG2_VCM_MSK, (x)) + +#define AD7768_VCM_OFF 0x07 + enum ad7768_conv_mode { AD7768_CONTINUOUS, AD7768_ONE_SHOT, @@ -159,6 +167,8 @@ struct ad7768_state { struct regmap *regmap; struct regmap *regmap24; struct regulator *vref; + struct regulator_dev *vcm_rdev; + unsigned int vcm_output_sel; struct clk *mclk; unsigned int mclk_freq; unsigned int samp_freq; @@ -662,6 +672,150 @@ static int ad7768_triggered_buffer_alloc(struct iio_dev *indio_dev) &ad7768_buffer_ops); } +static int ad7768_vcm_enable(struct regulator_dev *rdev) +{ + struct iio_dev *indio_dev = rdev_get_drvdata(rdev); + struct ad7768_state *st = iio_priv(indio_dev); + int ret, regval; + + if (!iio_device_claim_direct(indio_dev)) + return -EBUSY; + + /* To enable, set the last selected output */ + regval = AD7768_REG_ANALOG2_VCM(st->vcm_output_sel + 1); + ret = regmap_update_bits(st->regmap, AD7768_REG_ANALOG2, + AD7768_REG_ANALOG2_VCM_MSK, regval); + iio_device_release_direct(indio_dev); + + return ret; +} + +static int ad7768_vcm_disable(struct regulator_dev *rdev) +{ + struct iio_dev *indio_dev = rdev_get_drvdata(rdev); + struct ad7768_state *st = iio_priv(indio_dev); + int ret; + + if (!iio_device_claim_direct(indio_dev)) + return -EBUSY; + + ret = regmap_update_bits(st->regmap, AD7768_REG_ANALOG2, + AD7768_REG_ANALOG2_VCM_MSK, AD7768_VCM_OFF); + iio_device_release_direct(indio_dev); + + return ret; +} + +static int ad7768_vcm_is_enabled(struct regulator_dev *rdev) +{ + struct iio_dev *indio_dev = rdev_get_drvdata(rdev); + struct ad7768_state *st = iio_priv(indio_dev); + int ret, val; + + if (!iio_device_claim_direct(indio_dev)) + return -EBUSY; + + ret = regmap_read(st->regmap, AD7768_REG_ANALOG2, &val); + iio_device_release_direct(indio_dev); + if (ret) + return ret; + + return FIELD_GET(AD7768_REG_ANALOG2_VCM_MSK, val) != AD7768_VCM_OFF; +} + +static int ad7768_set_voltage_sel(struct regulator_dev *rdev, + unsigned int selector) +{ + unsigned int regval = AD7768_REG_ANALOG2_VCM(selector + 1); + struct iio_dev *indio_dev = rdev_get_drvdata(rdev); + struct ad7768_state *st = iio_priv(indio_dev); + int ret; + + if (!iio_device_claim_direct(indio_dev)) + return -EBUSY; + + ret = regmap_update_bits(st->regmap, AD7768_REG_ANALOG2, + AD7768_REG_ANALOG2_VCM_MSK, regval); + iio_device_release_direct(indio_dev); + if (ret) + return ret; + + st->vcm_output_sel = selector; + + return 0; +} + +static int ad7768_get_voltage_sel(struct regulator_dev *rdev) +{ + struct iio_dev *indio_dev = rdev_get_drvdata(rdev); + struct ad7768_state *st = iio_priv(indio_dev); + int ret, val; + + if (!iio_device_claim_direct(indio_dev)) + return -EBUSY; + + ret = regmap_read(st->regmap, AD7768_REG_ANALOG2, &val); + iio_device_release_direct(indio_dev); + if (ret) + return ret; + + val = FIELD_GET(AD7768_REG_ANALOG2_VCM_MSK, val); + + return clamp(val, 1, rdev->desc->n_voltages) - 1; +} + +static const struct regulator_ops vcm_regulator_ops = { + .enable = ad7768_vcm_enable, + .disable = ad7768_vcm_disable, + .is_enabled = ad7768_vcm_is_enabled, + .list_voltage = regulator_list_voltage_table, + .set_voltage_sel = ad7768_set_voltage_sel, + .get_voltage_sel = ad7768_get_voltage_sel, +}; + +static const unsigned int vcm_voltage_table[] = { + 2500000, + 2050000, + 1650000, + 1900000, + 1100000, + 900000, +}; + +static const struct regulator_desc vcm_desc = { + .name = "ad7768-1-vcm", + .of_match = "vcm-output", + .regulators_node = "regulators", + .n_voltages = ARRAY_SIZE(vcm_voltage_table), + .volt_table = vcm_voltage_table, + .ops = &vcm_regulator_ops, + .type = REGULATOR_VOLTAGE, + .owner = THIS_MODULE, +}; + +static int ad7768_register_regulators(struct device *dev, struct ad7768_state *st, + struct iio_dev *indio_dev) +{ + struct regulator_config config = { + .dev = dev, + .driver_data = indio_dev, + }; + int ret; + + /* Disable the regulator before registering it */ + ret = regmap_update_bits(st->regmap, AD7768_REG_ANALOG2, + AD7768_REG_ANALOG2_VCM_MSK, AD7768_VCM_OFF); + if (ret) + return ret; + + st->vcm_rdev = devm_regulator_register(dev, &vcm_desc, &config); + if (IS_ERR(st->vcm_rdev)) + return dev_err_probe(dev, PTR_ERR(st->vcm_rdev), + "failed to register VCM regulator\n"); + + return 0; +} + static int ad7768_probe(struct spi_device *spi) { struct ad7768_state *st; @@ -726,6 +880,11 @@ static int ad7768_probe(struct spi_device *spi) indio_dev->info = &ad7768_info; indio_dev->modes = INDIO_DIRECT_MODE; + /* Register VCM output regulator */ + ret = ad7768_register_regulators(&spi->dev, st, indio_dev); + if (ret) + return ret; + ret = ad7768_setup(st); if (ret < 0) { dev_err(&spi->dev, "AD7768 setup failed\n");