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Thu, 05 Mar 2026 13:04:21 -0800 (PST) Received: from arch ([2409:40c2:542d:796b:d56f:9c25:f250:525e]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-8273a05c0b0sm21854421b3a.61.2026.03.05.13.04.12 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 05 Mar 2026 13:04:20 -0800 (PST) From: Bhargav Joshi To: lars@metafoo.de, Michael.Hennerich@analog.com, jic23@kernel.org Cc: dlechner@baylibre.com, nuno.sa@analog.com, andy@kernel.org, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, rougueprince47@gmail.com, linux-staging@lists.linux.dev Subject: [RFC PATCH] staging: iio: ad9832: modernize ABI and remove dds.h dependency Date: Fri, 6 Mar 2026 02:33:47 +0530 Message-ID: <20260305210347.120446-1-rougueprince47@gmail.com> X-Mailer: git-send-email 2.53.0 Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The AD9832 driver currently relies on legacy custom IIO macros defined in dds.h. This triggers checkpatch.pl warnings (NON_OCTAL_PERMISSIONS) and, more importantly, exposes a non-standard sysfs ABI (e.g., frequency0, frequency1, phase0-3) directly to user space. This patch removes the custom macros and migrates the driver to standard IIO API mechanisms: - Standard attributes (frequency, phase) now use info_mask_separate. - Non standard specific toggles (frequencysymbol, phasesymbol, pincontrol) have been migrated to an ext_info array. - Remove dds.h header dependency. - Pointless frequency_scale and phase_scale attributes are dropped as suggested by Jonathan in https://lore.kernel.org/linux-iio/20251231180939.422e9e62@jic23-huawei/ NOTE: This patch introduces an intentional ABI changes. The non-standard attributes (out_altvoltage0_frequency0, etc.) have been removed. They are replaced by standard attributes (out_altvoltage0_frequency and out_altvoltage0_phase). Routing to correct register while writing is handled by checking currently active frequencysymbol or phasesymbol. Testing: This patch has been strictly compile-tested. I do not have access to physical AD9832 hardware. I am submitting this as an RFC to see if these changes are acceptable, and to ask if someone with physical hardware could test thisg and provide a Tested-by tag. Signed-off-by: Bhargav Joshi --- This patch is heavily inspired from discussions in following thread. https://lore.kernel.org/linux-iio/20251215190806.11003-1-tomasborquez13@gmail.com/ Since this is an RFC please let me know if these changes are acceptable. drivers/staging/iio/frequency/ad9832.c | 135 +++++++++++++++---------- 1 file changed, 80 insertions(+), 55 deletions(-) diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/frequency/ad9832.c index b87ea1781b27..066a1b9ee8d5 100644 --- a/drivers/staging/iio/frequency/ad9832.c +++ b/drivers/staging/iio/frequency/ad9832.c @@ -23,8 +23,6 @@ #include #include -#include "dds.h" - /* Registers */ #define AD9832_FREQ0LL 0x0 #define AD9832_FREQ0HL 0x1 @@ -168,12 +166,63 @@ static int ad9832_write_phase(struct ad9832_state *st, return spi_sync(st->spi, &st->phase_msg); } -static ssize_t ad9832_write(struct device *dev, struct device_attribute *attr, - const char *buf, size_t len) +static int ad9832_write_raw(struct iio_dev *indio_dev, + struct iio_chan_spec const *chan, + int val, int val2, long mask) +{ + struct ad9832_state *st = iio_priv(indio_dev); + int ret; + unsigned int addr; + + if (val < 0) + return -EINVAL; + + mutex_lock(&st->lock); + switch (mask) { + case IIO_CHAN_INFO_FREQUENCY: + if (st->ctrl_fp & AD9832_FREQ) + addr = AD9832_FREQ1HM; + else + addr = AD9832_FREQ0HM; + + ret = ad9832_write_frequency(st, addr, val); + break; + + case IIO_CHAN_INFO_PHASE: + switch (FIELD_GET(AD9832_PHASE_MASK, st->ctrl_fp)) { + case 0: + addr = AD9832_PHASE0H; + break; + case 1: + addr = AD9832_PHASE1H; + break; + case 2: + addr = AD9832_PHASE2H; + break; + case 3: + addr = AD9832_PHASE3H; + break; + default: + addr = AD9832_PHASE0H; + break; + } + ret = ad9832_write_phase(st, addr, val); + break; + + default: + ret = -EINVAL; + } + mutex_unlock(&st->lock); + + return ret; +} + +static ssize_t ad9832_write_ext_info(struct iio_dev *indio_dev, + uintptr_t private, + const struct iio_chan_spec *chan, + const char *buf, size_t len) { - struct iio_dev *indio_dev = dev_to_iio_dev(dev); struct ad9832_state *st = iio_priv(indio_dev); - struct iio_dev_attr *this_attr = to_iio_dev_attr(attr); int ret; unsigned long val; @@ -182,17 +231,7 @@ static ssize_t ad9832_write(struct device *dev, struct device_attribute *attr, goto error_ret; mutex_lock(&st->lock); - switch ((u32)this_attr->address) { - case AD9832_FREQ0HM: - case AD9832_FREQ1HM: - ret = ad9832_write_frequency(st, this_attr->address, val); - break; - case AD9832_PHASE0H: - case AD9832_PHASE1H: - case AD9832_PHASE2H: - case AD9832_PHASE3H: - ret = ad9832_write_phase(st, this_attr->address, val); - break; + switch ((u32)private) { case AD9832_PINCTRL_EN: st->ctrl_ss &= ~AD9832_SELSRC; st->ctrl_ss |= FIELD_PREP(AD9832_SELSRC, val ? 0 : 1); @@ -245,50 +284,34 @@ static ssize_t ad9832_write(struct device *dev, struct device_attribute *attr, return ret ? ret : len; } -/* - * see dds.h for further information - */ +#define AD9832_EXT_INFO(_name, _ident) { \ + .name = _name, \ + .write = ad9832_write_ext_info, \ + .private = _ident, \ + .shared = IIO_SEPARATE, \ +} -static IIO_DEV_ATTR_FREQ(0, 0, 0200, NULL, ad9832_write, AD9832_FREQ0HM); -static IIO_DEV_ATTR_FREQ(0, 1, 0200, NULL, ad9832_write, AD9832_FREQ1HM); -static IIO_DEV_ATTR_FREQSYMBOL(0, 0200, NULL, ad9832_write, AD9832_FREQ_SYM); -static IIO_CONST_ATTR_FREQ_SCALE(0, "1"); /* 1Hz */ - -static IIO_DEV_ATTR_PHASE(0, 0, 0200, NULL, ad9832_write, AD9832_PHASE0H); -static IIO_DEV_ATTR_PHASE(0, 1, 0200, NULL, ad9832_write, AD9832_PHASE1H); -static IIO_DEV_ATTR_PHASE(0, 2, 0200, NULL, ad9832_write, AD9832_PHASE2H); -static IIO_DEV_ATTR_PHASE(0, 3, 0200, NULL, ad9832_write, AD9832_PHASE3H); -static IIO_DEV_ATTR_PHASESYMBOL(0, 0200, NULL, - ad9832_write, AD9832_PHASE_SYM); -static IIO_CONST_ATTR_PHASE_SCALE(0, "0.0015339808"); /* 2PI/2^12 rad*/ - -static IIO_DEV_ATTR_PINCONTROL_EN(0, 0200, NULL, - ad9832_write, AD9832_PINCTRL_EN); -static IIO_DEV_ATTR_OUT_ENABLE(0, 0200, NULL, - ad9832_write, AD9832_OUTPUT_EN); - -static struct attribute *ad9832_attributes[] = { - &iio_dev_attr_out_altvoltage0_frequency0.dev_attr.attr, - &iio_dev_attr_out_altvoltage0_frequency1.dev_attr.attr, - &iio_const_attr_out_altvoltage0_frequency_scale.dev_attr.attr, - &iio_dev_attr_out_altvoltage0_phase0.dev_attr.attr, - &iio_dev_attr_out_altvoltage0_phase1.dev_attr.attr, - &iio_dev_attr_out_altvoltage0_phase2.dev_attr.attr, - &iio_dev_attr_out_altvoltage0_phase3.dev_attr.attr, - &iio_const_attr_out_altvoltage0_phase_scale.dev_attr.attr, - &iio_dev_attr_out_altvoltage0_pincontrol_en.dev_attr.attr, - &iio_dev_attr_out_altvoltage0_frequencysymbol.dev_attr.attr, - &iio_dev_attr_out_altvoltage0_phasesymbol.dev_attr.attr, - &iio_dev_attr_out_altvoltage0_out_enable.dev_attr.attr, - NULL, +static const struct iio_chan_spec_ext_info ad9832_ext_info[] = { + AD9832_EXT_INFO("pincontrol_en", AD9832_PINCTRL_EN), + AD9832_EXT_INFO("frequencysymbol", AD9832_FREQ_SYM), + AD9832_EXT_INFO("phasesymbol", AD9832_PHASE_SYM), + AD9832_EXT_INFO("out_enable", AD9832_OUTPUT_EN), + { } }; -static const struct attribute_group ad9832_attribute_group = { - .attrs = ad9832_attributes, +static const struct iio_chan_spec ad9832_channels[] = { + { + .type = IIO_ALTVOLTAGE, + .indexed = 1, + .channel = 0, + .info_mask_separate = BIT(IIO_CHAN_INFO_FREQUENCY) | + BIT(IIO_CHAN_INFO_PHASE), + .ext_info = ad9832_ext_info, + }, }; static const struct iio_info ad9832_info = { - .attrs = &ad9832_attribute_group, + .write_raw = ad9832_write_raw, }; static int ad9832_probe(struct spi_device *spi) @@ -321,6 +344,8 @@ static int ad9832_probe(struct spi_device *spi) indio_dev->name = spi_get_device_id(spi)->name; indio_dev->info = &ad9832_info; indio_dev->modes = INDIO_DIRECT_MODE; + indio_dev->channels = ad9832_channels; + indio_dev->num_channels = ARRAY_SIZE(ad9832_channels); /* Setup default messages */ st->xfer.tx_buf = &st->data; -- 2.53.0