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Subject[PATCH 3/3] ntrig sysfs access to filter parameters
Date
This should make it a little more convenient to tweak the filtering
parameters on the fly. Also unlike load-time parameters, this provides
independent tuning for each device conntected.

Signed-off-by: Rafi Rubin <rafi@seas.upenn.edu>
---
drivers/hid/hid-ntrig.c | 285 +++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 285 insertions(+), 0 deletions(-)

diff --git a/drivers/hid/hid-ntrig.c b/drivers/hid/hid-ntrig.c
index 18609c1..b6b0cae 100644
--- a/drivers/hid/hid-ntrig.c
+++ b/drivers/hid/hid-ntrig.c
@@ -89,6 +89,287 @@ struct ntrig_data {
__u16 sensor_physical_height;
};

+
+static ssize_t show_phys_width(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+ struct ntrig_data *nd = hid_get_drvdata(hdev);
+
+ return sprintf(buf, "%d\n", nd->sensor_physical_width);
+}
+
+static DEVICE_ATTR(sensor_physical_width, S_IRUGO, show_phys_width, NULL);
+
+static ssize_t show_phys_height(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+ struct ntrig_data *nd = hid_get_drvdata(hdev);
+
+ return sprintf(buf, "%d\n", nd->sensor_physical_height);
+}
+
+static DEVICE_ATTR(sensor_physical_height, S_IRUGO, show_phys_height, NULL);
+
+static ssize_t show_log_width(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+ struct ntrig_data *nd = hid_get_drvdata(hdev);
+
+ return sprintf(buf, "%d\n", nd->sensor_logical_width);
+}
+
+static DEVICE_ATTR(sensor_logical_width, S_IRUGO, show_log_width, NULL);
+
+static ssize_t show_log_height(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+ struct ntrig_data *nd = hid_get_drvdata(hdev);
+
+ return sprintf(buf, "%d\n", nd->sensor_logical_height);
+}
+
+static DEVICE_ATTR(sensor_logical_height, S_IRUGO, show_log_height, NULL);
+
+static ssize_t show_min_width(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+ struct ntrig_data *nd = hid_get_drvdata(hdev);
+
+ return sprintf(buf, "%d\n", nd->min_width *
+ nd->sensor_physical_width /
+ nd->sensor_logical_width);
+}
+
+static ssize_t set_min_width(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+ struct ntrig_data *nd = hid_get_drvdata(hdev);
+
+ unsigned long val;
+
+ if (strict_strtoul(buf, 0, &val))
+ return -EINVAL;
+
+ if (val > nd->sensor_physical_width)
+ return -EINVAL;
+
+ nd->min_width = val * nd->sensor_logical_width /
+ nd->sensor_physical_width;
+
+ return count;
+}
+
+static DEVICE_ATTR(min_width, S_IWUSR | S_IRUGO, show_min_width, set_min_width);
+
+static ssize_t show_min_height(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+ struct ntrig_data *nd = hid_get_drvdata(hdev);
+
+ return sprintf(buf, "%d\n", nd->min_height *
+ nd->sensor_physical_height /
+ nd->sensor_logical_height);
+}
+
+static ssize_t set_min_height(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+ struct ntrig_data *nd = hid_get_drvdata(hdev);
+
+ unsigned long val;
+
+ if (strict_strtoul(buf, 0, &val))
+ return -EINVAL;
+
+ if (val > nd->sensor_physical_height)
+ return -EINVAL;
+
+ nd->min_height = val * nd->sensor_logical_height /
+ nd->sensor_physical_height;
+
+ return count;
+}
+
+static DEVICE_ATTR(min_height, S_IWUSR | S_IRUGO, show_min_height,
+ set_min_height);
+
+static ssize_t show_activate_slack(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+ struct ntrig_data *nd = hid_get_drvdata(hdev);
+
+ return sprintf(buf, "%d\n", nd->activate_slack);
+}
+
+static ssize_t set_activate_slack(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+ struct ntrig_data *nd = hid_get_drvdata(hdev);
+
+ unsigned long val;
+
+ if (strict_strtoul(buf, 0, &val))
+ return -EINVAL;
+
+ if (val > 0x7f)
+ return -EINVAL;
+
+ nd->activate_slack = val;
+
+ return count;
+}
+
+static DEVICE_ATTR(activate_slack, S_IWUSR | S_IRUGO, show_activate_slack,
+ set_activate_slack);
+
+static ssize_t show_activation_width(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+ struct ntrig_data *nd = hid_get_drvdata(hdev);
+
+ return sprintf(buf, "%d\n", nd->activation_width *
+ nd->sensor_physical_width /
+ nd->sensor_logical_width);
+}
+
+static ssize_t set_activation_width(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+ struct ntrig_data *nd = hid_get_drvdata(hdev);
+
+ unsigned long val;
+
+ if (strict_strtoul(buf, 0, &val))
+ return -EINVAL;
+
+ if (val > nd->sensor_physical_width)
+ return -EINVAL;
+
+ nd->activation_width = val * nd->sensor_logical_width /
+ nd->sensor_physical_width;
+
+ return count;
+}
+
+static DEVICE_ATTR(activation_width, S_IWUSR | S_IRUGO, show_activation_width,
+ set_activation_width);
+
+static ssize_t show_activation_height(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+ struct ntrig_data *nd = hid_get_drvdata(hdev);
+
+ return sprintf(buf, "%d\n", nd->activation_height *
+ nd->sensor_physical_height /
+ nd->sensor_logical_height);
+}
+
+static ssize_t set_activation_height(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+ struct ntrig_data *nd = hid_get_drvdata(hdev);
+
+ unsigned long val;
+
+ if (strict_strtoul(buf, 0, &val))
+ return -EINVAL;
+
+ if (val > nd->sensor_physical_height)
+ return -EINVAL;
+
+ nd->activation_height = val * nd->sensor_logical_height /
+ nd->sensor_physical_height;
+
+ return count;
+}
+
+static DEVICE_ATTR(activation_height, S_IWUSR | S_IRUGO,
+ show_activation_height, set_activation_height);
+
+static ssize_t show_deactivate_slack(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+ struct ntrig_data *nd = hid_get_drvdata(hdev);
+
+ return sprintf(buf, "%d\n", -nd->deactivate_slack);
+}
+
+static ssize_t set_deactivate_slack(struct device *dev,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct hid_device *hdev = container_of(dev, struct hid_device, dev);
+ struct ntrig_data *nd = hid_get_drvdata(hdev);
+
+ unsigned long val;
+
+ if (strict_strtoul(buf, 0, &val))
+ return -EINVAL;
+
+ /*
+ * No more than 8 terminal frames have been observed so far
+ * and higher slack is highly likely to leave the single
+ * touch emulation stuck down.
+ */
+ if (val > 7)
+ return -EINVAL;
+
+ nd->deactivate_slack = -val;
+
+ return count;
+}
+
+static DEVICE_ATTR(deactivate_slack, S_IWUSR | S_IRUGO, show_deactivate_slack,
+ set_deactivate_slack);
+
+static struct attribute *sysfs_attrs[] = {
+ &dev_attr_sensor_physical_width.attr,
+ &dev_attr_sensor_physical_height.attr,
+ &dev_attr_sensor_logical_width.attr,
+ &dev_attr_sensor_logical_height.attr,
+ &dev_attr_min_height.attr,
+ &dev_attr_min_width.attr,
+ &dev_attr_activate_slack.attr,
+ &dev_attr_activation_width.attr,
+ &dev_attr_activation_height.attr,
+ &dev_attr_deactivate_slack.attr,
+ NULL
+};
+
+static struct attribute_group ntrig_attribute_group = {
+ .attrs = sysfs_attrs
+};
+
/*
* this driver is aimed at two firmware versions in circulation:
* - dual pen/finger single touch
@@ -567,6 +848,8 @@ static int ntrig_probe(struct hid_device *hdev, const struct hid_device_id *id)
if (report)
usbhid_submit_report(hdev, report, USB_DIR_OUT);

+ ret = sysfs_create_group(&hdev->dev.kobj,
+ &ntrig_attribute_group);

return 0;
err_free:
@@ -576,6 +859,8 @@ err_free:

static void ntrig_remove(struct hid_device *hdev)
{
+ sysfs_remove_group(&hdev->dev.kobj,
+ &ntrig_attribute_group);
hid_hw_stop(hdev);
kfree(hid_get_drvdata(hdev));
}
--
1.7.1


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