From: Beniamin Bia <beniamin.bia@analog.com>
To: <jic23@kernel.org>
Cc: <lars@metafoo.de>, <Michael.Hennerich@analog.com>,
<pmeerw@pmeerw.net>, <linux-iio@vger.kernel.org>,
<linux-kernel@vger.kernel.org>, <biabeniamin@outlook.com>,
<knaack.h@gmx.de>, <robh+dt@kernel.org>, <mark.rutland@arm.com>,
<devicetree@vger.kernel.org>,
Beniamin Bia <beniamin.bia@analog.com>
Subject: [PATCH v4 1/5] iio: core: Handle 'dB' suffix in core
Date: Wed, 29 Jan 2020 16:22:57 +0200 [thread overview]
Message-ID: <20200129142301.13918-2-beniamin.bia@analog.com> (raw)
In-Reply-To: <20200129142301.13918-1-beniamin.bia@analog.com>
This patch handles the db suffix used for writing micro db values.
Signed-off-by: Beniamin Bia <beniamin.bia@analog.com>
---
drivers/iio/industrialio-core.c | 35 ++++++++++++++++++++++++++++++---
1 file changed, 32 insertions(+), 3 deletions(-)
diff --git a/drivers/iio/industrialio-core.c b/drivers/iio/industrialio-core.c
index 65ff0d067018..b70111837420 100644
--- a/drivers/iio/industrialio-core.c
+++ b/drivers/iio/industrialio-core.c
@@ -769,17 +769,18 @@ static ssize_t iio_read_channel_info_avail(struct device *dev,
}
/**
- * iio_str_to_fixpoint() - Parse a fixed-point number from a string
+ * __iio_str_to_fixpoint() - Parse a fixed-point number from a string
* @str: The string to parse
* @fract_mult: Multiplier for the first decimal place, should be a power of 10
* @integer: The integer part of the number
* @fract: The fractional part of the number
+ * @scale_db: True if this should parse as dB
*
* Returns 0 on success, or a negative error code if the string could not be
* parsed.
*/
-int iio_str_to_fixpoint(const char *str, int fract_mult,
- int *integer, int *fract)
+int __iio_str_to_fixpoint(const char *str, int fract_mult,
+ int *integer, int *fract, bool scale_db)
{
int i = 0, f = 0;
bool integer_part = true, negative = false;
@@ -810,6 +811,10 @@ int iio_str_to_fixpoint(const char *str, int fract_mult,
break;
else
return -EINVAL;
+ } else if (!strncmp(str, " dB", sizeof(" dB") - 1) && scale_db) {
+ /* Ignore the dB suffix */
+ str += sizeof(" dB") - 1;
+ continue;
} else if (*str == '.' && integer_part) {
integer_part = false;
} else {
@@ -832,6 +837,22 @@ int iio_str_to_fixpoint(const char *str, int fract_mult,
}
EXPORT_SYMBOL_GPL(iio_str_to_fixpoint);
+/**
+ * iio_str_to_fixpoint() - Parse a fixed-point number from a string
+ * @str: The string to parse
+ * @fract_mult: Multiplier for the first decimal place, should be a power of 10
+ * @integer: The integer part of the number
+ * @fract: The fractional part of the number
+ *
+ * Returns 0 on success, or a negative error code if the string could not be
+ * parsed.
+ */
+int iio_str_to_fixpoint(const char *str, int fract_mult,
+ int *integer, int *fract)
+{
+ return __iio_str_to_fixpoint(str, fract_mult, integer, fract, false);
+}
+
static ssize_t iio_write_channel_info(struct device *dev,
struct device_attribute *attr,
const char *buf,
@@ -842,6 +863,7 @@ static ssize_t iio_write_channel_info(struct device *dev,
int ret, fract_mult = 100000;
int integer, fract = 0;
bool is_char = false;
+ bool scale_db = false;
/* Assumes decimal - precision based on number of digits */
if (!indio_dev->info->write_raw)
@@ -853,6 +875,9 @@ static ssize_t iio_write_channel_info(struct device *dev,
case IIO_VAL_INT:
fract_mult = 0;
break;
+ case IIO_VAL_INT_PLUS_MICRO_DB:
+ scale_db = true;
+ /* fall through */
case IIO_VAL_INT_PLUS_MICRO:
fract_mult = 100000;
break;
@@ -877,6 +902,10 @@ static ssize_t iio_write_channel_info(struct device *dev,
if (ret)
return ret;
}
+ ret = __iio_str_to_fixpoint(buf, fract_mult, &integer, &fract,
+ scale_db);
+ if (ret)
+ return ret;
ret = indio_dev->info->write_raw(indio_dev, this_attr->c,
integer, fract, this_attr->address);
--
2.17.1
next prev parent reply other threads:[~2020-01-29 14:21 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-29 14:22 [PATCH v4 0/5] Add hmc425a support Beniamin Bia
2020-01-29 14:22 ` Beniamin Bia [this message]
2020-02-02 10:41 ` [PATCH v4 1/5] iio: core: Handle 'dB' suffix in core Jonathan Cameron
2020-01-29 14:22 ` [PATCH v4 2/5] iio: amplifiers: ad8366: Add write_raw_get_fmt function Beniamin Bia
2020-01-29 14:22 ` [PATCH v4 3/5] iio: amplifiers: hmc425a: Add support for HMC425A attenuator Beniamin Bia
2020-02-02 10:52 ` Jonathan Cameron
2020-01-29 14:23 ` [PATCH v4 4/5] dt-bindings: iio: amplifiers: Add docs for HMC425A Step Attenuator Beniamin Bia
2020-02-02 10:53 ` Jonathan Cameron
2020-02-03 11:25 ` Ardelean, Alexandru
2020-02-06 10:26 ` Jonathan Cameron
2020-02-06 17:35 ` Rob Herring
2020-01-29 14:23 ` [PATCH v4 5/5] MAINTAINERS: add entry for hmc425a driver Beniamin Bia
2020-02-03 10:25 ` Andy Shevchenko
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