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Date: Thu, 23 May 2019 11:07:36 +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>,
Benson Leung <bleung@...omium.org>,
Enric Balletbo i Serra <enric.balletbo@...labora.com>,
Guenter Roeck <groeck@...omium.org>,
Lee Jones <lee.jones@...aro.org>,
Gwendal Grignou <gwendal@...omium.org>,
linux-iio@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/3] iio: common: cros_ec_sensors: add sysfs attribute for frequencies
In order to provide minimum and maximum frequencies for each sensors,
we use a standard API (sampling_frequency_available) to provide them
to userland.
As cros_ec_sensors_core_init do not manage default attrs, we change
the signature to let all kind of sensors to provide "struct iio_info"
with their callback. This change impact drivers using that function.
Then cros_ec_* sensors provides frequencies range in sysfs like this:
[min step max]
Signed-off-by: Fabien Lahoudere <fabien.lahoudere@...labora.com>
---
.../common/cros_ec_sensors/cros_ec_sensors.c | 6 +--
.../cros_ec_sensors/cros_ec_sensors_core.c | 38 +++++++++++++++++++
drivers/iio/light/cros_ec_light_prox.c | 6 +--
drivers/iio/pressure/cros_ec_baro.c | 6 +--
.../linux/iio/common/cros_ec_sensors_core.h | 4 +-
5 files changed, 50 insertions(+), 10 deletions(-)
diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
index 17af4e0fd5f8..a0ecee15a6c8 100644
--- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
+++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors.c
@@ -172,7 +172,7 @@ static int cros_ec_sensors_write(struct iio_dev *indio_dev,
return ret;
}
-static const struct iio_info ec_sensors_info = {
+static struct iio_info ec_sensors_info = {
.read_raw = &cros_ec_sensors_read,
.write_raw = &cros_ec_sensors_write,
};
@@ -195,11 +195,11 @@ static int cros_ec_sensors_probe(struct platform_device *pdev)
if (!indio_dev)
return -ENOMEM;
- ret = cros_ec_sensors_core_init(pdev, indio_dev, true);
+ ret = cros_ec_sensors_core_init(pdev, indio_dev, &ec_sensors_info,
+ true);
if (ret)
return ret;
- indio_dev->info = &ec_sensors_info;
state = iio_priv(indio_dev);
for (channel = state->channels, i = CROS_EC_SENSOR_X;
i < CROS_EC_SENSOR_MAX_AXIS; i++, channel++) {
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 ac53ea32c1b1..08fb5d3dc7b5 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/kernel.h>
@@ -86,8 +87,42 @@ static int cros_ec_get_host_cmd_version_mask(struct cros_ec_device *ec_dev,
return ret;
}
+/**
+ * cros_ec_sensors_read_freq() - sysfs function to get available frequencies
+ * @dev: Device structure for this device.
+ * @attr: Description of the attribute.
+ * @buf: Incoming string
+ *
+ * The later modes are only relevant to the ring buffer - and depend on current
+ * mode. Note that data sheet gives rather wide tolerances for these so integer
+ * division will give good enough answer and not all chips have them specified
+ * at all.
+ **/
+static ssize_t cros_ec_sensors_read_freq(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct iio_dev *indio_dev = dev_to_iio_dev(dev);
+ struct cros_ec_sensors_core_state *state = iio_priv(indio_dev);
+
+ return snprintf(buf, PAGE_SIZE, "[%d 1 %d]\n", state->min_freq,
+ state->max_freq);
+}
+
+static IIO_DEV_ATTR_SAMP_FREQ_AVAIL(cros_ec_sensors_read_freq);
+
+static struct attribute *cros_ec_sensors_attributes[] = {
+ &iio_dev_attr_sampling_frequency_available.dev_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group cros_ec_sensors_attribute_group = {
+ .attrs = cros_ec_sensors_attributes,
+};
+
int cros_ec_sensors_core_init(struct platform_device *pdev,
struct iio_dev *indio_dev,
+ struct iio_info *info,
bool physical_device)
{
struct device *dev = &pdev->dev;
@@ -149,6 +184,9 @@ int cros_ec_sensors_core_init(struct platform_device *pdev,
}
}
+ info->attrs = &cros_ec_sensors_attribute_group;
+ indio_dev->info = info;
+
return 0;
}
EXPORT_SYMBOL_GPL(cros_ec_sensors_core_init);
diff --git a/drivers/iio/light/cros_ec_light_prox.c b/drivers/iio/light/cros_ec_light_prox.c
index 308ee6ff2e22..1772e339cf14 100644
--- a/drivers/iio/light/cros_ec_light_prox.c
+++ b/drivers/iio/light/cros_ec_light_prox.c
@@ -161,7 +161,7 @@ static int cros_ec_light_prox_write(struct iio_dev *indio_dev,
return ret;
}
-static const struct iio_info cros_ec_light_prox_info = {
+static struct iio_info cros_ec_light_prox_info = {
.read_raw = &cros_ec_light_prox_read,
.write_raw = &cros_ec_light_prox_write,
};
@@ -184,11 +184,11 @@ static int cros_ec_light_prox_probe(struct platform_device *pdev)
if (!indio_dev)
return -ENOMEM;
- ret = cros_ec_sensors_core_init(pdev, indio_dev, true);
+ ret = cros_ec_sensors_core_init(pdev, indio_dev,
+ &cros_ec_light_prox_info, true);
if (ret)
return ret;
- indio_dev->info = &cros_ec_light_prox_info;
state = iio_priv(indio_dev);
state->core.type = state->core.resp->info.type;
state->core.loc = state->core.resp->info.location;
diff --git a/drivers/iio/pressure/cros_ec_baro.c b/drivers/iio/pressure/cros_ec_baro.c
index 034ce98d6e97..cd3be0f16226 100644
--- a/drivers/iio/pressure/cros_ec_baro.c
+++ b/drivers/iio/pressure/cros_ec_baro.c
@@ -107,7 +107,7 @@ static int cros_ec_baro_write(struct iio_dev *indio_dev,
return ret;
}
-static const struct iio_info cros_ec_baro_info = {
+static struct iio_info cros_ec_baro_info = {
.read_raw = &cros_ec_baro_read,
.write_raw = &cros_ec_baro_write,
};
@@ -130,11 +130,11 @@ static int cros_ec_baro_probe(struct platform_device *pdev)
if (!indio_dev)
return -ENOMEM;
- ret = cros_ec_sensors_core_init(pdev, indio_dev, true);
+ ret = cros_ec_sensors_core_init(pdev, indio_dev, &cros_ec_baro_info,
+ true);
if (ret)
return ret;
- indio_dev->info = &cros_ec_baro_info;
state = iio_priv(indio_dev);
state->core.type = state->core.resp->info.type;
state->core.loc = state->core.resp->info.location;
diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h
index 32fd08bbcf52..f170a72ac08d 100644
--- a/include/linux/iio/common/cros_ec_sensors_core.h
+++ b/include/linux/iio/common/cros_ec_sensors_core.h
@@ -114,12 +114,14 @@ struct platform_device;
* cros_ec_sensors_core_init() - basic initialization of the core structure
* @pdev: platform device created for the sensors
* @indio_dev: iio device structure of the device
+ * @info: iio info structure with read and write callback
* @physical_device: true if the device refers to a physical device
*
* Return: 0 on success, -errno on failure.
*/
int cros_ec_sensors_core_init(struct platform_device *pdev,
- struct iio_dev *indio_dev, bool physical_device);
+ struct iio_dev *indio_dev, struct iio_info *info,
+ bool physical_device);
/**
* cros_ec_sensors_capture() - the trigger handler function
--
2.20.1
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