linux-kernel - [PATCH v3 7/8] iio: common: cros_ec_sensors: add sysfs attribute for frequencies

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Message-Id: <ee20a9b8d1700a3987570d2edd28fe9ac9e73123.1560848479.git.fabien.lahoudere@collabora.com>
Date:   Tue, 18 Jun 2019 11:06:38 +0200
From:   Fabien Lahoudere <fabien.lahoudere@...labora.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     kernel@...labora.com,
        Fabien Lahoudere <fabien.lahoudere@...labora.com>,
        Jonathan Cameron <jic23@...nel.org>,
        Hartmut Knaack <knaack.h@....de>,
        Lars-Peter Clausen <lars@...afoo.de>,
        Peter Meerwald-Stadler <pmeerw@...erw.net>,
        linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v3 7/8] iio: common: cros_ec_sensors: add sysfs attribute for frequencies

Embedded controller return minimum and maximum frequencies, unfortunately
we have no way to know the step for all available frequencies.
Even if not complete, we can return a list of known values using the
standard read_avail callback (IIO_CHAN_INFO_SAMP_FREQ) to provide them to
userland.

Now cros_ec_* sensors provides frequencies values in sysfs like this:
"0 min max".

0 is always true to disable the sensor.

Signed-off-by: Fabien Lahoudere <fabien.lahoudere@...labora.com>
---
 .../cros_ec_sensors/cros_ec_sensors_core.c    | 22 +++++++++++++++++++
 .../linux/iio/common/cros_ec_sensors_core.h   |  4 +++-
 2 files changed, 25 insertions(+), 1 deletion(-)

diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
index 2ce077b576a4..8df82b675752 100644
--- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
+++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c
@@ -10,6 +10,7 @@
 #include <linux/iio/buffer.h>
 #include <linux/iio/common/cros_ec_sensors_core.h>
 #include <linux/iio/iio.h>
+#include <linux/iio/sysfs.h>
 #include <linux/iio/kfifo_buf.h>
 #include <linux/iio/trigger_consumer.h>
 #include <linux/iio/triggered_buffer.h>
@@ -86,6 +87,26 @@ static int cros_ec_get_host_cmd_version_mask(struct cros_ec_device *ec_dev,
 	return ret;
 }
 
+static int cros_ec_read_avail(struct iio_dev *indio_dev,
+			      struct iio_chan_spec const *chan,
+			      const int **vals,
+			      int *type,
+			      int *length,
+			      long mask)
+{
+	struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
+
+	switch (mask) {
+	case IIO_CHAN_INFO_SAMP_FREQ:
+		*length = 3;
+		*vals = (const int *)&state->frequency_range;
+		*type = IIO_VAL_INT;
+		return IIO_AVAIL_LIST;
+	}
+
+	return -EINVAL;
+}
+
 int cros_ec_sensors_core_init(struct platform_device *pdev,
 			      int num_channels,
 			      bool physical_device)
@@ -161,6 +182,7 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
 		}
 	}
 
+	state->info.read_avail = cros_ec_read_avail;
 	indio_dev->info = &state->info;
 
 	/* Timestamp channel */
diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h
index 89937ad242ef..5fa9ba5332e0 100644
--- a/include/linux/iio/common/cros_ec_sensors_core.h
+++ b/include/linux/iio/common/cros_ec_sensors_core.h
@@ -140,7 +140,9 @@ int cros_ec_sensors_core_register(struct platform_device *pdev,
 	channel[idx].scan_type.shift = 0;\
 	channel[idx].scan_index = idx;\
 	channel[idx].ext_info = cros_ec_sensors_ext_info;\
-	channel[idx].scan_type.sign = 'u';
+	channel[idx].scan_type.sign = 'u';\
+	channel[idx].info_mask_shared_by_all_available = \
+		BIT(IIO_CHAN_INFO_SAMP_FREQ);
 
 /**
  * cros_ec_motion_send_host_cmd() - send motion sense host command
-- 
2.20.1