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Mon, 25 Aug 2025 06:52:37 -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 v5 4/4] iio: adc: update ad7779 to use IIO backend Date: Mon, 25 Aug 2025 13:51:19 +0300 Message-ID: <20250825105121.19848-5-Ioana.Risteiu@analog.com> X-Mailer: git-send-email 2.47.2 In-Reply-To: <20250825105121.19848-1-Ioana.Risteiu@analog.com> References: <20250825105121.19848-1-Ioana.Risteiu@analog.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ADIRuleOP-NewSCL: Rule Triggered X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODI1MDA3NSBTYWx0ZWRfX1UULtcJjLjvm 7SJjunQf8QKBVexsrrVFQ54v9MfbUzSbHeI+X24i7tj27T0DkIzf+mrJoDZp79lV4jQ5sRPTdcB ko1mZ8xYp5FRzweRk5u8CyAOwf2SmFVsduPpdMwnD4SKh7kowQO43coOx19NavSjGobGAeQwV22 uImhcUaGlAtHs585Qo5qKFqXkJyrTJ1BMQ+Uqu3EKi/q7eYfr9/2y/H8paEiQoXEppsS5syf8Yl 3gGP1A5QWlXDgLzEHywHgv9+JZI6QPgggg92HX1KFPFsLmbN/3ubV+wB9f24YEDWJgNj5qEjtWn MZ8YXpI1e7aPNkCbLkVa2bI5nbMG2+NoaS05CrlCKOogT663TamSKBTgvRpGIjBh7p0e79m7Ajn Aplr/8yV X-Proofpoint-ORIG-GUID: k7_6OvaCPGVdfNNqJ24mrhrJWZtPrzx0 X-Proofpoint-GUID: k7_6OvaCPGVdfNNqJ24mrhrJWZtPrzx0 X-Authority-Analysis: v=2.4 cv=AoXu3P9P c=1 sm=1 tr=0 ts=68ac407f cx=c_pps a=3WNzaoukacrqR9RwcOSAdA==:117 a=3WNzaoukacrqR9RwcOSAdA==:17 a=2OwXVqhp2XgA:10 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=2025-08-25_05,2025-08-20_03,2025-03-28_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 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 v5: - fix indentation - change num_lanes variable from int to u32 type - use unsigned int in for loop declaration drivers/iio/adc/ad7779.c | 115 ++++++++++++++++++++++++++++++++++++++- 1 file changed, 114 insertions(+), 1 deletion(-) diff --git a/drivers/iio/adc/ad7779.c b/drivers/iio/adc/ad7779.c index b4e56983201c..3776af1c65e9 100644 --- a/drivers/iio/adc/ad7779.c +++ b/drivers/iio/adc/ad7779.c @@ -25,6 +25,7 @@ #include #include +#include #include #include #include @@ -116,6 +117,12 @@ #define AD7779_CRC8_POLY 0x07 DECLARE_CRC8_TABLE(ad7779_crc8_table); +enum ad7779_data_lines { + AD7779_1LINE = 1, + AD7779_2LINES = 2, + AD7779_4LINES = 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, struct gpio_desc *reset_gpio) return ret; } +static int ad7779_update_scan_mode(struct iio_dev *indio_dev, + const unsigned long *scan_mask) +{ + struct ad7779_state *st = iio_priv(indio_dev); + unsigned int c; + int ret; + + for (c = 0; c < AD7779_NUM_CHANNELS; c++) { + if (test_bit(c, scan_mask)) + ret = iio_backend_chan_enable(st->back, c); + else + ret = iio_backend_chan_disable(st->back, c); + if (ret) + return ret; + } + + return 0; +} + static const struct iio_info ad7779_info = { .read_raw = ad7779_read_raw, .write_raw = ad7779_write_raw, .debugfs_reg_access = &ad7779_reg_access, }; +static const struct iio_info ad7779_info_data = { + .read_raw = ad7779_read_raw, + .write_raw = ad7779_write_raw, + .debugfs_reg_access = &ad7779_reg_access, + .update_scan_mode = &ad7779_update_scan_mode, +}; + static const struct iio_enum ad7779_filter_enum = { .items = ad7779_filter_type, .num_items = ARRAY_SIZE(ad7779_filter_type), @@ -752,6 +786,48 @@ static int ad7779_conf(struct ad7779_state *st, struct gpio_desc *start_gpio) return 0; } +static int ad7779_set_data_lines(struct iio_dev *indio_dev, u32 num_lanes) +{ + struct ad7779_state *st = iio_priv(indio_dev); + int ret; + + if (num_lanes != AD7779_1LINE && + num_lanes != AD7779_2LINES && + num_lanes != AD7779_4LINES) + return -EINVAL; + + ret = ad7779_set_sampling_frequency(st, num_lanes * AD7779_DEFAULT_SAMPLING_1LINE); + if (ret) + return ret; + + ret = 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 ad7779_state *st) +{ + struct iio_chan_spec *channels; + struct device *dev = &st->spi->dev; + + channels = devm_kmemdup_array(dev, st->chip_info->channels, + ARRAY_SIZE(ad7779_channels), + sizeof(*channels), GFP_KERNEL); + if (!channels) + return -ENOMEM; + + for (unsigned int i = 0; i < ARRAY_SIZE(ad7779_channels); i++) + channels[i].scan_type.endianness = IIO_CPU; + + indio_dev->channels = channels; + + return 0; +} + static int ad7779_setup_without_backend(struct ad7779_state *st, struct iio_dev *indio_dev) { int ret; @@ -796,6 +872,39 @@ static int ad7779_setup_without_backend(struct ad7779_state *st, struct iio_dev FIELD_PREP(AD7779_DCLK_CLK_DIV_MSK, 7)); } +static int ad7779_setup_backend(struct ad7779_state *st, struct iio_dev *indio_dev) +{ + struct device *dev = &st->spi->dev; + int ret; + u32 num_lanes; + + indio_dev->info = &ad7779_info_data; + + ret = ad7779_setup_channels(indio_dev, st); + if (ret) + return ret; + + st->back = 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 = devm_iio_backend_request_buffer(dev, st->back, indio_dev); + if (ret) + return ret; + + ret = devm_iio_backend_enable(dev, st->back); + if (ret) + return ret; + + num_lanes = 4; + ret = device_property_read_u32(dev, "adi,num-lanes", &num_lanes); + if (ret && ret != -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 +957,10 @@ static int ad7779_probe(struct spi_device *spi) indio_dev->modes = INDIO_DIRECT_MODE; indio_dev->num_channels = ARRAY_SIZE(ad7779_channels); - ret = ad7779_setup_without_backend(st, indio_dev); + if (device_property_present(dev, "io-backends")) + ret = ad7779_setup_backend(st, indio_dev); + else + ret = ad7779_setup_without_backend(st, indio_dev); if (ret) return ret; @@ -942,3 +1054,4 @@ module_spi_driver(ad7779_driver); MODULE_AUTHOR("Ramona Alexandra Nechita "); MODULE_DESCRIPTION("Analog Devices AD7779 ADC"); MODULE_LICENSE("GPL"); +MODULE_IMPORT_NS("IIO_BACKEND"); -- 2.47.2