From: Miquel Raynal <miquel.raynal@bootlin.com>
To: Jonathan Cameron <jic23@kernel.org>,
Hartmut Knaack <knaack.h@gmx.de>,
Lars-Peter Clausen <lars@metafoo.de>,
Peter Meerwald-Stadler <pmeerw@pmeerw.net>,
Rob Herring <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>
Cc: <devicetree@vger.kernel.org>,
linux-iio@vger.kernel.org, linux-kernel@vger.kernel.org,
Thomas Petazzoni <thomas.petazzoni@bootlin.com>,
Miquel Raynal <miquel.raynal@bootlin.com>
Subject: [PATCH v2 1/7] iio: adc: max1027: Add debugfs register read support
Date: Thu, 3 Oct 2019 19:33:55 +0200 [thread overview]
Message-ID: <20191003173401.16343-2-miquel.raynal@bootlin.com> (raw)
In-Reply-To: <20191003173401.16343-1-miquel.raynal@bootlin.com>
Until now, only write operations were supported. Force two bytes read
operation when reading from this register (might be wrong when reading
the temperature, but will work with any other value).
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
---
drivers/iio/adc/max1027.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
diff --git a/drivers/iio/adc/max1027.c b/drivers/iio/adc/max1027.c
index 214883458582..6cdfe9ef73fc 100644
--- a/drivers/iio/adc/max1027.c
+++ b/drivers/iio/adc/max1027.c
@@ -309,8 +309,11 @@ static int max1027_debugfs_reg_access(struct iio_dev *indio_dev,
struct max1027_state *st = iio_priv(indio_dev);
u8 *val = (u8 *)st->buffer;
- if (readval != NULL)
- return -EINVAL;
+ if (readval) {
+ int ret = spi_read(st->spi, val, 2);
+ *readval = be16_to_cpu(st->buffer[0]);
+ return ret;
+ }
*val = (u8)writeval;
return spi_write(st->spi, val, 1);
--
2.20.1
next prev parent reply other threads:[~2019-10-03 17:34 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-03 17:33 [PATCH v2 0/7] Introduce max12xx ADC support Miquel Raynal
2019-10-03 17:33 ` Miquel Raynal [this message]
2019-10-06 10:04 ` [PATCH v2 1/7] iio: adc: max1027: Add debugfs register read support Jonathan Cameron
2019-10-07 10:00 ` Miquel Raynal
2019-10-12 13:56 ` Jonathan Cameron
2019-10-03 17:33 ` [PATCH v2 2/7] iio: adc: max1027: Make it optional to use interrupts Miquel Raynal
2019-10-06 10:18 ` Jonathan Cameron
2019-10-07 10:01 ` Miquel Raynal
2019-10-07 11:44 ` Jonathan Cameron
2019-10-03 17:33 ` [PATCH v2 3/7] iio: adc: max1027: Reset the device at probe time Miquel Raynal
2019-10-03 17:33 ` [PATCH v2 4/7] iio: adc: max1027: Prepare the introduction of different resolutions Miquel Raynal
2019-10-06 10:22 ` Jonathan Cameron
2019-10-07 10:03 ` Miquel Raynal
2019-10-03 17:33 ` [PATCH v2 5/7] iio: adc: max1027: Introduce 12-bit devices support Miquel Raynal
2019-10-06 10:24 ` Jonathan Cameron
2019-10-03 17:34 ` [PATCH v2 6/7] dt-bindings: iio: adc: max1027: Mark interrupts as optional Miquel Raynal
2019-10-03 17:34 ` [PATCH v2 7/7] dt-bindings: iio: adc: max1027: Document max12xx series compatibles Miquel Raynal
2019-10-06 10:27 ` Jonathan Cameron
2019-10-07 10:04 ` Miquel Raynal
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