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Tue, 26 Aug 2025 04:45:41 -0400 From: Ioana Risteiu To: Lars-Peter Clausen , Michael Hennerich , Jonathan Cameron , "David Lechner" , =?UTF-8?q?Nuno=20S=C3=A1?= , Andy Shevchenko , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Ramona Nechita , , , CC: Ioana Risteiu , Andy Shevchenko Subject: [PATCH v6 4/4] iio: adc: update ad7779 to use IIO backend Date: Tue, 26 Aug 2025 01:13:52 +0300 Message-ID: <20250825221355.6214-5-Ioana.Risteiu@analog.com> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20250825221355.6214-1-Ioana.Risteiu@analog.com> References: <20250825221355.6214-1-Ioana.Risteiu@analog.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-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODI1MDA3NSBTYWx0ZWRfX2PiWhj44zDvO F2hQq5mGY801faLKW3+KfYqOjcxwI2g/ogap90dRG4vNGsWZQnII9PvoeeVHoQNWWwyx7MUz3SP zeU1O/zrnKtq/K9nTahBOZtCqSKn9h6fETXoBqTxbT1taJpQtL+VQqTZZ8j2BDbTnRHPXUBUAAD Hvsn1nSWUTEnCeeTwq1jj721FBnoJRtsuxc5P8Enof79dqd0rRD/aVw2nCtyepSWOdwiW6tsUBM Pa4fLk4fZ4tsYvFuPpyA/7ylTUeYZPCzyABaq39YA1GVCxX+Gb1rnn6+R0/3bjefK2rLoF7CZM8 ZbjqGuWSaipvFwAteaTR4ZSD9FWP/nif5KF0LIW8S4uvV6/wHfeTzmjNeTG7P6Djr6Z4u5J4223 lVgFlGcN X-Proofpoint-ORIG-GUID: 98tuE9Y6rQGwoUi7b00tNERNTXT6OMZy X-Proofpoint-GUID: 98tuE9Y6rQGwoUi7b00tNERNTXT6OMZy X-Authority-Analysis: v=2.4 cv=AoXu3P9P c=1 sm=1 tr=0 ts=68ad743d cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=2OwXVqhp2XgA:10 a=QyXUC8HyAAAA:8 a=gAnH3GRIAAAA:8 a=VjRcvFoKhyOr0kwuT1sA:9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-08-26_02,2025-08-26_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 spamscore=0 priorityscore=1501 malwarescore=0 clxscore=1015 adultscore=0 bulkscore=0 phishscore=0 impostorscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2508250075 Content-Type: text/plain; charset="utf-8" Add a new functionality to ad7779 driver that streams data through data output interface using IIO backend interface. Reviewed-by: Andy Shevchenko Signed-off-by: Ioana Risteiu --- changes in v6: - fix indentation - remove ad7779_data_lines enum - move channels and num_channels assignment together in ad7779_setup_chann= els() drivers/iio/adc/ad7779.c | 108 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 107 insertions(+), 1 deletion(-) diff --git a/drivers/iio/adc/ad7779.c b/drivers/iio/adc/ad7779.c index 4e6fa6370593..aac5049c9a07 100644 --- a/drivers/iio/adc/ad7779.c +++ b/drivers/iio/adc/ad7779.c @@ -25,6 +25,7 @@ #include =20 #include +#include #include #include #include @@ -145,6 +146,7 @@ struct ad7779_state { struct completion completion; unsigned int sampling_freq; enum ad7779_filter filter_enabled; + struct iio_backend *back; /* * DMA (thus cache coherency maintenance) requires the * transfer buffers to live in their own cache lines. @@ -630,12 +632,38 @@ static int ad7779_reset(struct iio_dev *indio_dev, st= ruct gpio_desc *reset_gpio) return ret; } =20 +static int ad7779_update_scan_mode(struct iio_dev *indio_dev, + const unsigned long *scan_mask) +{ + struct ad7779_state *st =3D iio_priv(indio_dev); + unsigned int c; + int ret; + + for (c =3D 0; c < AD7779_NUM_CHANNELS; c++) { + if (test_bit(c, scan_mask)) + ret =3D iio_backend_chan_enable(st->back, c); + else + ret =3D iio_backend_chan_disable(st->back, c); + if (ret) + return ret; + } + + return 0; +} + static const struct iio_info ad7779_info =3D { .read_raw =3D ad7779_read_raw, .write_raw =3D ad7779_write_raw, .debugfs_reg_access =3D &ad7779_reg_access, }; =20 +static const struct iio_info ad7779_info_data =3D { + .read_raw =3D ad7779_read_raw, + .write_raw =3D ad7779_write_raw, + .debugfs_reg_access =3D &ad7779_reg_access, + .update_scan_mode =3D &ad7779_update_scan_mode, +}; + static const struct iio_enum ad7779_filter_enum =3D { .items =3D ad7779_filter_type, .num_items =3D ARRAY_SIZE(ad7779_filter_type), @@ -752,6 +780,47 @@ static int ad7779_conf(struct ad7779_state *st, struct= gpio_desc *start_gpio) return 0; } =20 +static int ad7779_set_data_lines(struct iio_dev *indio_dev, u32 num_lanes) +{ + struct ad7779_state *st =3D iio_priv(indio_dev); + int ret; + + if (num_lanes !=3D 1 && num_lanes !=3D 2 && num_lanes !=3D 4) + return -EINVAL; + + ret =3D ad7779_set_sampling_frequency(st, num_lanes * AD7779_DEFAULT_SAMP= LING_1LINE); + if (ret) + return ret; + + ret =3D iio_backend_num_lanes_set(st->back, num_lanes); + if (ret) + return ret; + + return ad7779_spi_write_mask(st, AD7779_REG_DOUT_FORMAT, + AD7779_DOUT_FORMAT_MSK, + FIELD_PREP(AD7779_DOUT_FORMAT_MSK, 2 - ilog2(num_lanes))); +} + +static int ad7779_setup_channels(struct iio_dev *indio_dev, const struct a= d7779_state *st) +{ + struct iio_chan_spec *channels; + struct device *dev =3D &st->spi->dev; + + channels =3D devm_kmemdup_array(dev, st->chip_info->channels, + ARRAY_SIZE(ad7779_channels), + sizeof(*channels), GFP_KERNEL); + if (!channels) + return -ENOMEM; + + for (unsigned int i =3D 0; i < ARRAY_SIZE(ad7779_channels); i++) + channels[i].scan_type.endianness =3D IIO_CPU; + + indio_dev->channels =3D channels; + indio_dev->num_channels =3D ARRAY_SIZE(ad7779_channels); + + return 0; +} + static int ad7779_setup_without_backend(struct ad7779_state *st, struct ii= o_dev *indio_dev) { int ret; @@ -797,6 +866,39 @@ static int ad7779_setup_without_backend(struct ad7779_= state *st, struct iio_dev FIELD_PREP(AD7779_DCLK_CLK_DIV_MSK, 7)); } =20 +static int ad7779_setup_backend(struct ad7779_state *st, struct iio_dev *i= ndio_dev) +{ + struct device *dev =3D &st->spi->dev; + int ret; + u32 num_lanes; + + indio_dev->info =3D &ad7779_info_data; + + ret =3D ad7779_setup_channels(indio_dev, st); + if (ret) + return ret; + + st->back =3D devm_iio_backend_get(dev, NULL); + if (IS_ERR(st->back)) + return dev_err_probe(dev, PTR_ERR(st->back), + "failed to get iio backend"); + + ret =3D devm_iio_backend_request_buffer(dev, st->back, indio_dev); + if (ret) + return ret; + + ret =3D devm_iio_backend_enable(dev, st->back); + if (ret) + return ret; + + num_lanes =3D 4; + ret =3D device_property_read_u32(dev, "adi,num-lanes", &num_lanes); + if (ret && ret !=3D -EINVAL) + return ret; + + return ad7779_set_data_lines(indio_dev, num_lanes); +} + static int ad7779_probe(struct spi_device *spi) { struct iio_dev *indio_dev; @@ -848,7 +950,10 @@ static int ad7779_probe(struct spi_device *spi) indio_dev->name =3D st->chip_info->name; indio_dev->modes =3D INDIO_DIRECT_MODE; =20 - ret =3D ad7779_setup_without_backend(st, indio_dev); + if (device_property_present(dev, "io-backends")) + ret =3D ad7779_setup_backend(st, indio_dev); + else + ret =3D ad7779_setup_without_backend(st, indio_dev); if (ret) return ret; =20 @@ -942,3 +1047,4 @@ module_spi_driver(ad7779_driver); MODULE_AUTHOR("Ramona Alexandra Nechita "); MODULE_DESCRIPTION("Analog Devices AD7779 ADC"); MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS("IIO_BACKEND"); --=20 2.47.2