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Wed, 20 Aug 2025 08:03:29 -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 Subject: [PATCH v4 4/4] iio: adc: update ad7779 to use IIO backend Date: Wed, 20 Aug 2025 15:02:45 +0300 Message-ID: <20250820120247.3012-5-Ioana.Risteiu@analog.com> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20250820120247.3012-1-Ioana.Risteiu@analog.com> References: <20250820120247.3012-1-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: AW1haW4tMjUwODE5MDE5NSBTYWx0ZWRfX0B6s+v+BXogx u4PCRGjlJMqip62mE7N/4AUl3x9rqeoqeVjhZHMrGKVdj/mZBto2vFnFz0auUJOqzYkpffuqZjf Ire7Py9W9FH/0BtRnNTGHSjGsVMhySNADIAdT+xSe7NSJ+iMnq0GeZLjgRTPmNEUTfbvrIxTeyA j/XbYPC/jXbZ7wTeC5tWNkRQwnAfHttMLlST8yV3lzjIIPMKu6YVOWVi4gwW/MRaSA16mLI04v2 IuH9uX7AsrNMWbkoDIuw4ChovZ7T5bLGDIIg2o8FA5ArYHWKdIABirDRZbbNxuO5IwYhXq9MTZu gNwvNc/+RASmRs5aaHUcg86v90EVA3jr6gK9gF1H2Zg9yPV0sFvIv19HnhrbCSvpDms6ajlIfuu 3iz4SOspI9OiItlAt0s0274dFe1d2g== X-Proofpoint-ORIG-GUID: hiXJFulbev_dI0BC2Put3c1GCiTAzDcB X-Authority-Analysis: v=2.4 cv=BoHEAYX5 c=1 sm=1 tr=0 ts=68a5b999 cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=2OwXVqhp2XgA:10 a=gAnH3GRIAAAA:8 a=VjRcvFoKhyOr0kwuT1sA:9 a=cPQSjfK2_nFv0Q5t_7PE:22 X-Proofpoint-GUID: hiXJFulbev_dI0BC2Put3c1GCiTAzDcB 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=2025-08-20_03,2025-08-20_02,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 adultscore=0 phishscore=0 spamscore=0 impostorscore=0 malwarescore=0 bulkscore=0 clxscore=1015 priorityscore=1501 lowpriorityscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2508110000 definitions=main-2508190195 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. Signed-off-by: Ioana Risteiu --- changes in v4: - grouped includes in alphabetical order - reordered fields in struct ad7779_state - modified logic of setting the number of lanes=20 - validating devicetree value drivers/iio/adc/ad7779.c | 116 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 115 insertions(+), 1 deletion(-) diff --git a/drivers/iio/adc/ad7779.c b/drivers/iio/adc/ad7779.c index f7e681c0e8c0..adca490061c9 100644 --- a/drivers/iio/adc/ad7779.c +++ b/drivers/iio/adc/ad7779.c @@ -25,6 +25,7 @@ #include =20 #include +#include #include #include #include @@ -116,6 +117,12 @@ #define AD7779_CRC8_POLY 0x07 DECLARE_CRC8_TABLE(ad7779_crc8_table); =20 +enum ad7779_data_lines { + AD7779_1LINE =3D 1, + AD7779_2LINES =3D 2, + AD7779_4LINES =3D 4, +}; + enum ad7779_filter { AD7779_SINC3, AD7779_SINC5, @@ -145,6 +152,7 @@ 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 +638,38 @@ 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 +786,49 @@ 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, + unsigned int num_lanes) +{ + struct ad7779_state *st =3D iio_priv(indio_dev); + int ret =3D -EINVAL; + + if (num_lanes !=3D AD7779_1LINE && + num_lanes !=3D AD7779_2LINES && + num_lanes !=3D AD7779_4LINES) + return ret; + + 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 (int i =3D 0; i < ARRAY_SIZE(ad7779_channels); i++) + channels[i].scan_type.endianness =3D IIO_CPU; + + indio_dev->channels =3D channels; + + return 0; +} + static int ad7779_setup_without_backend(struct ad7779_state *st, struct ii= o_dev *indio_dev) { int ret; @@ -796,6 +873,39 @@ 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 =3D -EINVAL; + int 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 +958,10 @@ static int ad7779_probe(struct spi_device *spi) indio_dev->modes =3D INDIO_DIRECT_MODE; indio_dev->num_channels =3D ARRAY_SIZE(ad7779_channels); =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); =20 if (ret) return ret; @@ -943,3 +1056,4 @@ 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