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[73.123.232.110]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7c958ea36eesm142986885a.111.2025.04.24.15.34.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Apr 2025 15:34:43 -0700 (PDT) From: Gabriel Shahrouzi To: andy@kernel.org, dlechner@baylibre.com, gregkh@linuxfoundation.org, jic23@kernel.org, lars@metafoo.de, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-staging@lists.linux.dev, Michael.Hennerich@analog.com, nuno.sa@analog.com Cc: gshahrouzi@gmail.com, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linux.dev, stable@vger.kernel.org Subject: [PATCH v4 1/2] staging: iio: frequency: ad9832: Use SLEEP bit instead of RESET to disable output Date: Thu, 24 Apr 2025 18:32:08 -0400 Message-ID: <20250424223210.91317-2-gshahrouzi@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250424223210.91317-1-gshahrouzi@gmail.com> References: <20250424223210.91317-1-gshahrouzi@gmail.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 Content-Type: text/plain; charset="utf-8" According to the AD9832 datasheet (Table 10, D12 description), setting the RESET bit forces the phase accumulator to zero, which corresponds to a full-scale DC output, rather than disabling the output signal. The correct way to disable the output and enter a low-power state is to set the AD9832_SLEEP bit (Table 10, D13 description), which powers down the internal DAC current sources and disables internal clocks. Fixes: ea707584bac1 ("Staging: IIO: DDS: AD9832 / AD9835 driver") Cc: stable@vger.kernel.org Signed-off-by: Gabriel Shahrouzi --- v3 -> v4: - Rebase changes ontop of most recent changes. v2 -> v3: v1 -> v2: --- drivers/staging/iio/frequency/ad9832.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/f= requency/ad9832.c index 49388da5a684a..2e555084ff98a 100644 --- a/drivers/staging/iio/frequency/ad9832.c +++ b/drivers/staging/iio/frequency/ad9832.c @@ -236,7 +236,7 @@ static ssize_t ad9832_write(struct device *dev, struct = device_attribute *attr, if (val) st->ctrl_src &=3D ~(AD9832_RESET | AD9832_SLEEP | AD9832_CLR); else - st->ctrl_src |=3D FIELD_PREP(AD9832_RESET, 1); + st->ctrl_src |=3D FIELD_PREP(AD9832_SLEEP, 1); =20 st->data =3D cpu_to_be16(FIELD_PREP(AD9832_CMD_MSK, AD9832_CMD_SLEEPRESC= LR) | st->ctrl_src); --=20 2.43.0 From nobody Sun Feb 8 07:59:02 2026 Received: from mail-qk1-f177.google.com (mail-qk1-f177.google.com [209.85.222.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 0DDAA22686B; 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[73.123.232.110]) by smtp.gmail.com with ESMTPSA id af79cd13be357-7c958ea36eesm142986885a.111.2025.04.24.15.34.44 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Apr 2025 15:34:44 -0700 (PDT) From: Gabriel Shahrouzi To: andy@kernel.org, dlechner@baylibre.com, gregkh@linuxfoundation.org, jic23@kernel.org, lars@metafoo.de, linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org, linux-staging@lists.linux.dev, Michael.Hennerich@analog.com, nuno.sa@analog.com Cc: gshahrouzi@gmail.com, skhan@linuxfoundation.org, linux-kernel-mentees@lists.linux.dev Subject: [PATCH v4 2/2] staging: iio: frequency: ad9832: Refactor powerdown control Date: Thu, 24 Apr 2025 18:32:09 -0400 Message-ID: <20250424223210.91317-3-gshahrouzi@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250424223210.91317-1-gshahrouzi@gmail.com> References: <20250424223210.91317-1-gshahrouzi@gmail.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 Content-Type: text/plain; charset="utf-8" Replace custom implementation with out_altvoltage_powerdown ABI. The attribute's logic is inverted (1 now enables powerdown) to match the standard. Signed-off-by: Gabriel Shahrouzi --- V3 -> v4: - Use guard(mutex) for simplified locking. - Use an extended attribute. v2 -> v3: v1 -> v2: Refactor powerdown functionality. --- drivers/staging/iio/frequency/ad9832.c | 69 +++++++++++++++++++------- 1 file changed, 51 insertions(+), 18 deletions(-) diff --git a/drivers/staging/iio/frequency/ad9832.c b/drivers/staging/iio/f= requency/ad9832.c index 2e555084ff98a..b8b52302abf36 100644 --- a/drivers/staging/iio/frequency/ad9832.c +++ b/drivers/staging/iio/frequency/ad9832.c @@ -174,6 +174,32 @@ static int ad9832_write_phase(struct ad9832_state *st, return spi_sync(st->spi, &st->phase_msg); } =20 +static ssize_t ad9832_write_powerdown(struct iio_dev *indio_dev, uintptr_t= private, + const struct iio_chan_spec *chan, + const char *buf, size_t len) +{ + struct ad9832_state *st =3D iio_priv(indio_dev); + int ret; + bool val; + + ret =3D kstrtobool(buf, &val); + if (ret) + return ret; + + guard(mutex)(&st->lock); + if (val) + st->ctrl_src |=3D AD9832_SLEEP; + else + st->ctrl_src &=3D ~(AD9832_RESET | AD9832_SLEEP | + AD9832_CLR); + + st->data =3D cpu_to_be16(FIELD_PREP(AD9832_CMD_MSK, AD9832_CMD_SLEEPRESCL= R) | + st->ctrl_src); + ret =3D spi_sync(st->spi, &st->msg); + + return ret ? ret : len; +} + static ssize_t ad9832_write(struct device *dev, struct device_attribute *a= ttr, const char *buf, size_t len) { @@ -185,9 +211,9 @@ static ssize_t ad9832_write(struct device *dev, struct = device_attribute *attr, =20 ret =3D kstrtoul(buf, 10, &val); if (ret) - goto error_ret; + return ret; =20 - mutex_lock(&st->lock); + guard(mutex)(&st->lock); switch ((u32)this_attr->address) { case AD9832_FREQ0HM: case AD9832_FREQ1HM: @@ -232,22 +258,9 @@ static ssize_t ad9832_write(struct device *dev, struct= device_attribute *attr, st->ctrl_fp); ret =3D spi_sync(st->spi, &st->msg); break; - case AD9832_OUTPUT_EN: - if (val) - st->ctrl_src &=3D ~(AD9832_RESET | AD9832_SLEEP | AD9832_CLR); - else - st->ctrl_src |=3D FIELD_PREP(AD9832_SLEEP, 1); - - st->data =3D cpu_to_be16(FIELD_PREP(AD9832_CMD_MSK, AD9832_CMD_SLEEPRESC= LR) | - st->ctrl_src); - ret =3D spi_sync(st->spi, &st->msg); - break; default: ret =3D -ENODEV; } - mutex_unlock(&st->lock); - -error_ret: return ret ? ret : len; } =20 @@ -270,8 +283,6 @@ static IIO_CONST_ATTR_PHASE_SCALE(0, "0.0015339808"); /= * 2PI/2^12 rad*/ =20 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); =20 static struct attribute *ad9832_attributes[] =3D { &iio_dev_attr_out_altvoltage0_frequency0.dev_attr.attr, @@ -285,7 +296,6 @@ static struct attribute *ad9832_attributes[] =3D { &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, }; =20 @@ -293,6 +303,27 @@ static const struct attribute_group ad9832_attribute_g= roup =3D { .attrs =3D ad9832_attributes, }; =20 +static const struct iio_chan_spec_ext_info ad9832_ext_info[] =3D { + { + .name =3D "powerdown", + .shared =3D IIO_SEPARATE, + .write =3D ad9832_write_powerdown, + }, + { }, +}; + +#define AD9832_CHANNEL(chan) { \ + .type =3D IIO_ALTVOLTAGE, \ + .indexed =3D 1, \ + .output =3D 1, \ + .channel =3D (chan), \ + .ext_info =3D ad9832_ext_info, \ +} + +static const struct iio_chan_spec ad9832_channels[] =3D { + AD9832_CHANNEL(0), +}; + static const struct iio_info ad9832_info =3D { .attrs =3D &ad9832_attribute_group, }; @@ -333,6 +364,8 @@ static int ad9832_probe(struct spi_device *spi) indio_dev->name =3D spi_get_device_id(spi)->name; indio_dev->info =3D &ad9832_info; indio_dev->modes =3D INDIO_DIRECT_MODE; + indio_dev->channels =3D ad9832_channels; + indio_dev->num_channels =3D ARRAY_SIZE(ad9832_channels); =20 /* Setup default messages */ =20 --=20 2.43.0