This patch adds 4 new r/w sysfs attributes to the hdaps driver:
/sys/devices/platform/hdaps/sampling_rate:
This determines the frequency of hardware queries and input device updates.
Default=50.
/sys/devices/platform/hdaps/oversampling_ratio:
When set to X, the embedded controller is told to do physical accelerometer
measurements at a rate that is X times higher than the rate at which
the driver reads those measurements (i.e., X*sampling_rate). This
reduces sample phase difference is, and useful for the running average
filter (see next). Default=5
/sys/devices/platform/hdaps/running_avg_filter_order:
When set to X, reported readouts will be the average of the last X physical
accelerometer measurements. Current firmware allows 1<=X<=8. Setting to a
high value decreases readout fluctuations. The averaging is handled
by the embedded controller, so no CPU resources are used. Default=2.
/sys/devices/platform/hdaps/fake_data_mode:
If set to 1, enables a test mode where the physical accelerometer readouts
are replaced with an incrementing counter. This is useful for checking the
regularity of the sampling interval and driver<->userspace communication,
which is useful for development and testing of the hdapd userspace daemon.
Signed-off-by: Shem Multinymous <[email protected]>
---
hdaps.c | 110 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 file changed, 110 insertions(+)
diff -up a/drivers/hwmon/hdaps.c a/drivers/hwmon/hdaps.c
--- a/drivers/hwmon/hdaps.c
+++ a/drivers/hwmon/hdaps.c
@@ -495,6 +495,102 @@ static ssize_t hdaps_invert_store(struct
return count;
}
+static ssize_t hdaps_sampling_rate_show(
+ struct device *dev, struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%d\n", sampling_rate);
+}
+
+static ssize_t hdaps_sampling_rate_store(
+ struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int rate, ret;
+ if (sscanf(buf, "%d", &rate) != 1 || rate>HZ || rate<0) {
+ printk(KERN_WARNING
+ "must have 0<input_sampling_rate<=HZ=%d\n", HZ);
+ return -EINVAL;
+ }
+ ret = hdaps_set_ec_config(rate*oversampling_ratio,
+ running_avg_filter_order);
+ if (ret)
+ return ret;
+ sampling_rate = rate;
+ return count;
+}
+
+static ssize_t hdaps_oversampling_ratio_show(
+ struct device *dev, struct device_attribute *attr, char *buf)
+{
+ int ec_rate, order;
+ int ret = hdaps_get_ec_config(&ec_rate, &order);
+ if (ret)
+ return ret;
+ return sprintf(buf, "%u\n", ec_rate / sampling_rate);
+}
+
+static ssize_t hdaps_oversampling_ratio_store(
+ struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int ratio, ret;
+ if (sscanf(buf, "%d", &ratio) != 1 || ratio<1)
+ return -EINVAL;
+ ret = hdaps_set_ec_config(sampling_rate*ratio,
+ running_avg_filter_order);
+ if (ret)
+ return ret;
+ oversampling_ratio = ratio;
+ return count;
+}
+
+static ssize_t hdaps_running_avg_filter_order_show(
+ struct device *dev, struct device_attribute *attr, char *buf)
+{
+ int rate, order;
+ int ret = hdaps_get_ec_config(&rate, &order);
+ if (ret)
+ return ret;
+ return sprintf(buf, "%u\n", order);
+}
+
+static ssize_t hdaps_running_avg_filter_order_store(
+ struct device *dev, struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int order, ret;
+ if (sscanf(buf, "%d", &order) != 1)
+ return -EINVAL;
+ ret = hdaps_set_ec_config(sampling_rate*oversampling_ratio, order);
+ if (ret)
+ return ret;
+ running_avg_filter_order = order;
+ return count;
+}
+
+static ssize_t hdaps_fake_data_mode_store(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ int on, ret;
+ if (sscanf(buf, "%d", &on) != 1 || on<0 || on>1) {
+ printk(KERN_WARNING
+ "fake_data should be 0 or 1\n");
+ return -EINVAL;
+ }
+ ret = hdaps_set_fake_data_mode(on);
+ if (ret)
+ return ret;
+ fake_data_mode = on;
+ return count;
+}
+
+static ssize_t hdaps_fake_data_mode_show(
+ struct device *dev, struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "%d\n", fake_data_mode);
+}
+
static DEVICE_ATTR(position, 0444, hdaps_position_show, NULL);
static DEVICE_ATTR(temp1, 0444, hdaps_temp1_show, NULL);
/* "temp1" instead of "temperature" is hwmon convention */
@@ -502,6 +598,16 @@ static DEVICE_ATTR(keyboard_activity, 04
static DEVICE_ATTR(mouse_activity, 0444, hdaps_mouse_activity_show, NULL);
static DEVICE_ATTR(calibrate, 0644, hdaps_calibrate_show,hdaps_calibrate_store);
static DEVICE_ATTR(invert, 0644, hdaps_invert_show, hdaps_invert_store);
+static DEVICE_ATTR(sampling_rate, 0644,
+ hdaps_sampling_rate_show, hdaps_sampling_rate_store);
+static DEVICE_ATTR(oversampling_ratio, 0644,
+ hdaps_oversampling_ratio_show,
+ hdaps_oversampling_ratio_store);
+static DEVICE_ATTR(running_avg_filter_order, 0644,
+ hdaps_running_avg_filter_order_show,
+ hdaps_running_avg_filter_order_store);
+static DEVICE_ATTR(fake_data_mode, 0644,
+ hdaps_fake_data_mode_show, hdaps_fake_data_mode_store);
static struct attribute *hdaps_attributes[] = {
&dev_attr_position.attr,
@@ -510,6 +616,10 @@ static struct attribute *hdaps_attribute
&dev_attr_mouse_activity.attr,
&dev_attr_calibrate.attr,
&dev_attr_invert.attr,
+ &dev_attr_sampling_rate.attr,
+ &dev_attr_oversampling_ratio.attr,
+ &dev_attr_running_avg_filter_order.attr,
+ &dev_attr_fake_data_mode.attr,
NULL,
};
-
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