From: Herve Codina <herve.codina@bootlin.com>
To: Herve Codina <herve.codina@bootlin.com>,
Liam Girdwood <lgirdwood@gmail.com>,
Mark Brown <broonie@kernel.org>, Rob Herring <robh+dt@kernel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
Conor Dooley <conor+dt@kernel.org>,
Jonathan Cameron <jic23@kernel.org>,
Lars-Peter Clausen <lars@metafoo.de>,
Jaroslav Kysela <perex@perex.cz>, Takashi Iwai <tiwai@suse.com>,
Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Cc: alsa-devel@alsa-project.org, devicetree@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org,
Christophe Leroy <christophe.leroy@csgroup.eu>,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>
Subject: [PATCH v2 5/9] iio: inkern: Add a helper to query an available minimum raw value
Date: Tue, 23 May 2023 17:12:19 +0200 [thread overview]
Message-ID: <20230523151223.109551-6-herve.codina@bootlin.com> (raw)
In-Reply-To: <20230523151223.109551-1-herve.codina@bootlin.com>
A helper, iio_read_max_channel_raw() exists to read the available
maximum raw value of a channel but nothing similar exists to read the
available minimum raw value.
This new helper, iio_read_min_channel_raw(), fills the hole and can be
used for reading the available minimum raw value of a channel.
It is fully based on the existing iio_read_max_channel_raw().
Signed-off-by: Herve Codina <herve.codina@bootlin.com>
---
drivers/iio/inkern.c | 70 ++++++++++++++++++++++++++++++++++++
include/linux/iio/consumer.h | 12 +++++++
2 files changed, 82 insertions(+)
diff --git a/drivers/iio/inkern.c b/drivers/iio/inkern.c
index f738db9a0c04..07b26ff8a334 100644
--- a/drivers/iio/inkern.c
+++ b/drivers/iio/inkern.c
@@ -915,6 +915,76 @@ int iio_read_max_channel_raw(struct iio_channel *chan, int *val)
}
EXPORT_SYMBOL_GPL(iio_read_max_channel_raw);
+static int iio_channel_read_min(struct iio_channel *chan,
+ int *val, int *val2, int *type,
+ enum iio_chan_info_enum info)
+{
+ int unused;
+ const int *vals;
+ int length;
+ int ret;
+
+ if (!val2)
+ val2 = &unused;
+
+ ret = iio_channel_read_avail(chan, &vals, type, &length, info);
+ if (ret < 0)
+ return ret;
+
+ switch (ret) {
+ case IIO_AVAIL_RANGE:
+ switch (*type) {
+ case IIO_VAL_INT:
+ *val = vals[0];
+ break;
+ default:
+ *val = vals[0];
+ *val2 = vals[1];
+ }
+ return 0;
+
+ case IIO_AVAIL_LIST:
+ if (length <= 0)
+ return -EINVAL;
+ switch (*type) {
+ case IIO_VAL_INT:
+ *val = vals[--length];
+ while (length) {
+ if (vals[--length] < *val)
+ *val = vals[length];
+ }
+ break;
+ default:
+ /* FIXME: learn about min for other iio values */
+ return -EINVAL;
+ }
+ return 0;
+
+ default:
+ return -EINVAL;
+ }
+}
+
+int iio_read_min_channel_raw(struct iio_channel *chan, int *val)
+{
+ struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev);
+ int ret;
+ int type;
+
+ mutex_lock(&iio_dev_opaque->info_exist_lock);
+ if (!chan->indio_dev->info) {
+ ret = -ENODEV;
+ goto err_unlock;
+ }
+
+ ret = iio_channel_read_min(chan, val, NULL, &type, IIO_CHAN_INFO_RAW);
+err_unlock:
+ mutex_unlock(&iio_dev_opaque->info_exist_lock);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(iio_read_min_channel_raw);
+
int iio_get_channel_type(struct iio_channel *chan, enum iio_chan_type *type)
{
struct iio_dev_opaque *iio_dev_opaque = to_iio_dev_opaque(chan->indio_dev);
diff --git a/include/linux/iio/consumer.h b/include/linux/iio/consumer.h
index f536820b9cf2..e9910b41d48e 100644
--- a/include/linux/iio/consumer.h
+++ b/include/linux/iio/consumer.h
@@ -301,6 +301,18 @@ int iio_write_channel_raw(struct iio_channel *chan, int val);
*/
int iio_read_max_channel_raw(struct iio_channel *chan, int *val);
+/**
+ * iio_read_min_channel_raw() - read minimum available raw value from a given
+ * channel, i.e. the minimum possible value.
+ * @chan: The channel being queried.
+ * @val: Value read back.
+ *
+ * Note, if standard units are required, raw reads from iio channels
+ * need the offset (default 0) and scale (default 1) to be applied
+ * as (raw + offset) * scale.
+ */
+int iio_read_min_channel_raw(struct iio_channel *chan, int *val);
+
/**
* iio_read_avail_channel_raw() - read available raw values from a given channel
* @chan: The channel being queried.
--
2.40.1
next prev parent reply other threads:[~2023-05-23 15:13 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-23 15:12 [PATCH v2 0/9] Add support for IIO devices in ASoC Herve Codina
2023-05-23 15:12 ` [PATCH v2 1/9] ASoC: dt-bindings: Add audio-iio-aux Herve Codina
2023-05-23 15:12 ` [PATCH v2 2/9] ASoC: dt-bindings: simple-card: Add additional-devs subnode Herve Codina
2023-05-23 15:12 ` [PATCH v2 3/9] iio: inkern: Check error explicitly in iio_channel_read_max() Herve Codina
2023-05-28 17:32 ` Jonathan Cameron
2023-05-23 15:12 ` [PATCH v2 4/9] iio: consumer.h: Fix raw values documentation notes Herve Codina
2023-05-28 17:29 ` Jonathan Cameron
2023-05-23 15:12 ` Herve Codina [this message]
2023-05-28 17:33 ` [PATCH v2 5/9] iio: inkern: Add a helper to query an available minimum raw value Jonathan Cameron
2023-06-03 14:04 ` andy.shevchenko
2023-06-05 7:46 ` Herve Codina
2023-06-05 9:45 ` Andy Shevchenko
2023-06-05 14:11 ` Herve Codina
2023-06-05 17:05 ` Jonathan Cameron
2023-06-05 17:36 ` Herve Codina
2023-05-23 15:12 ` [PATCH v2 6/9] ASoC: soc-dapm.h: Add a helper to build a DAPM widget dynamically Herve Codina
2023-06-03 14:07 ` andy.shevchenko
2023-06-05 8:54 ` Herve Codina
2023-06-05 12:35 ` Herve Codina
2023-05-23 15:12 ` [PATCH v2 7/9] ASoC: codecs: Add support for the generic IIO auxiliary devices Herve Codina
2023-05-28 17:38 ` Jonathan Cameron
2023-06-05 17:22 ` Herve Codina
2023-06-03 18:26 ` andy.shevchenko
2023-06-06 13:54 ` Herve Codina
2023-06-06 14:34 ` Andy Shevchenko
2023-06-07 14:56 ` Herve Codina
2023-06-07 13:23 ` Herve Codina
2023-05-23 15:12 ` [PATCH v2 8/9] ASoC: simple-card: Add missing of_node_put() in case of error Herve Codina
2023-05-23 23:24 ` Kuninori Morimoto
2023-05-23 15:12 ` [PATCH v2 9/9] ASoC: simple-card: Handle additional devices Herve Codina
2023-05-24 0:08 ` Kuninori Morimoto
2023-05-24 0:36 ` Kuninori Morimoto
2023-05-24 12:14 ` Herve Codina
2023-05-25 0:01 ` Kuninori Morimoto
2023-05-26 13:07 ` Herve Codina
2023-05-29 0:18 ` Kuninori Morimoto
2023-06-03 18:27 ` andy.shevchenko
2023-05-26 16:31 ` (subset) [PATCH v2 0/9] Add support for IIO devices in ASoC Mark Brown
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