linux-kernel - [PATCH 1/4] iio: hi8435: add raw access

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Date:   Fri, 19 May 2017 17:47:59 +0300
From:   Nikita Yushchenko <nikita.yoush@...entembedded.com>
To:     Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        Matt Ranostay <mranostay@...il.com>,
        Gregor Boirie <gregor.boirie@...rot.com>,
        Sanchayan Maity <maitysanchayan@...il.com>
Cc:     linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jeff White <Jeff.White@....aero>,
        Chris Healy <Chris.Healy@....aero>,
        Vladimir Barinov <vladimir.barinov@...entembedded.com>,
        Nikita Yushchenko <nikita.yoush@...entembedded.com>
Subject: [PATCH 1/4] iio: hi8435: add raw access

With current event-only driver, it is not possible for user space
application to know current senses if they don't change since
application starts.

Address that by adding raw access to channels.

Signed-off-by: Nikita Yushchenko <nikita.yoush@...entembedded.com>
---
 drivers/iio/adc/hi8435.c | 22 ++++++++++++++++++++++
 1 file changed, 22 insertions(+)

diff --git a/drivers/iio/adc/hi8435.c b/drivers/iio/adc/hi8435.c
index 678e8c7ea763..cb8e6342eddf 100644
--- a/drivers/iio/adc/hi8435.c
+++ b/drivers/iio/adc/hi8435.c
@@ -105,6 +105,26 @@ static int hi8435_writew(struct hi8435_priv *priv, u8 reg, u16 val)
 	return spi_write(priv->spi, priv->reg_buffer, 3);
 }
 
+static int hi8435_read_raw(struct iio_dev *idev,
+			   const struct iio_chan_spec *chan,
+			   int *val, int *val2, long mask)
+{
+	struct hi8435_priv *priv = iio_priv(idev);
+	u32 tmp;
+	int ret;
+
+	switch (mask) {
+	case IIO_CHAN_INFO_RAW:
+		ret = hi8435_readl(priv, HI8435_SO31_0_REG, &tmp);
+		if (ret < 0)
+			return ret;
+		*val = !!(tmp & BIT(chan->channel));
+		return IIO_VAL_INT;
+	default:
+		return -EINVAL;
+	}
+}
+
 static int hi8435_read_event_config(struct iio_dev *idev,
 				    const struct iio_chan_spec *chan,
 				    enum iio_event_type type,
@@ -333,6 +353,7 @@ static const struct iio_chan_spec_ext_info hi8435_ext_info[] = {
 	.type = IIO_VOLTAGE,				\
 	.indexed = 1,					\
 	.channel = num,					\
+	.info_mask_separate = BIT(IIO_CHAN_INFO_RAW),	\
 	.event_spec = hi8435_events,			\
 	.num_event_specs = ARRAY_SIZE(hi8435_events),	\
 	.ext_info = hi8435_ext_info,			\
@@ -376,6 +397,7 @@ static const struct iio_chan_spec hi8435_channels[] = {
 
 static const struct iio_info hi8435_info = {
 	.driver_module = THIS_MODULE,
+	.read_raw = hi8435_read_raw,
 	.read_event_config = &hi8435_read_event_config,
 	.write_event_config = hi8435_write_event_config,
 	.read_event_value = &hi8435_read_event_value,
-- 
2.11.0