sysfs file export the sliders in short int range
slider sysfs files will be superceded by input events
when we figure out what that should look like.
Signed-off-by: Joshua Clayton <stillcompiling@xxxxxxxxx>
---
drivers/input/misc/evifpanel.c | 112 +++++++++++++++++++++++++++++++++++++++++
1 file changed, 112 insertions(+)
diff --git a/drivers/input/misc/evifpanel.c b/drivers/input/misc/evifpanel.c
index aa28e6c..0bda86f 100644
--- a/drivers/input/misc/evifpanel.c
+++ b/drivers/input/misc/evifpanel.c
@@ -14,12 +14,18 @@
#include <linux/init.h>
#include <linux/serio.h>
#include <linux/slab.h>
+#include <linux/sysfs.h>
#define DRIVER_DESC "Uniwest EVI Frontpanel input driver"
MODULE_AUTHOR("Joshua Clayton <stillcompiling@xxxxxxxxx>");
MODULE_DESCRIPTION(DRIVER_DESC);
MODULE_LICENSE("GPL");
+struct fp_slider {
+ s32 sum;
+ s32 count;
+};
+
struct evifpanel {
struct input_dev *dev;
struct serio *serio;
@@ -27,6 +33,8 @@ struct evifpanel {
char name[64];
char phys[32];
unsigned char buf[8];
+ s32 h_slider;
+ s32 v_slider;
};
struct key_map {
@@ -38,6 +46,30 @@ struct key_map {
};
static struct key_map btns[] = {
+ { EV_ABS, ABS_X, 0, 3, 4 },
+ { EV_ABS, ABS_X, 1, 3, 0 },
+ { EV_ABS, ABS_X, 2, 4, 6 },
+ { EV_ABS, ABS_X, 3, 4, 5 },
+ { EV_ABS, ABS_X, 4, 4, 4 },
+ { EV_ABS, ABS_X, 5, 4, 3 },
+ { EV_ABS, ABS_X, 6, 4, 2 },
+ { EV_ABS, ABS_X, 7, 4, 1 },
+ { EV_ABS, ABS_X, 8, 4, 0 },
+ { EV_ABS, ABS_X, 9, 5, 6 },
+ { EV_ABS, ABS_X, 10, 5, 5 },
+ { EV_ABS, ABS_X, 11, 3, 3 },
+ { EV_ABS, ABS_Y, 0, 3, 2 },
+ { EV_ABS, ABS_Y, 1, 6, 2 },
+ { EV_ABS, ABS_Y, 2, 6, 3 },
+ { EV_ABS, ABS_Y, 3, 6, 4 },
+ { EV_ABS, ABS_Y, 4, 6, 5 },
+ { EV_ABS, ABS_Y, 5, 6, 6 },
+ { EV_ABS, ABS_Y, 6, 5, 0 },
+ { EV_ABS, ABS_Y, 7, 5, 1 },
+ { EV_ABS, ABS_Y, 8, 5, 2 },
+ { EV_ABS, ABS_Y, 9, 5, 3 },
+ { EV_ABS, ABS_Y, 10, 5, 4 },
+ { EV_ABS, ABS_Y, 11, 3, 1 },
{ EV_KEY, KEY_F1, 1, 6, 0 },
{ EV_KEY, KEY_D, 1, 6, 1 },
{ EV_KEY, KEY_N, 1, 7, 0 },
@@ -57,22 +89,63 @@ static void fp_check_key(struct evifpanel *fp, struct key_map *key)
input_report_key(fp->dev, key->code, value);
}
+static void fp_slider_accumulate(struct evifpanel *fp,
+ struct fp_slider *slider, struct key_map *key)
+{
+ s32 value = !!(fp->buf[key->byte] & BIT(key->offset));
+
+ slider->sum += value * key->value;
+ slider->count += value;
+}
+
+static s32 fp_slider_value(struct evifpanel *fp, struct fp_slider *slider)
+{
+ s32 value;
+
+ if (slider->count)
+ value = (slider->sum * 0xffff / (11 * slider->count)) - 0x8000;
+ else
+ value = 0;
+
+ if (value == -1)
+ value = 0;
+
+ return value;
+}
+
/*
* Check buttons against array of key_map
*/
static void fp_check_btns(struct evifpanel *fp, struct key_map *key)
{
+ struct fp_slider h_axis, v_axis;
+
+ h_axis.sum = 0;
+ h_axis.count = 0;
+ v_axis.sum = 0;
+ v_axis.count = 0;
+
while (key->type) {
switch (key->type) {
case EV_KEY:
fp_check_key(fp, key);
break;
+ case EV_ABS:
+ if (key->code == ABS_X)
+ fp_slider_accumulate(fp, &h_axis, key);
+ else
+ fp_slider_accumulate(fp, &v_axis, key);
+
+ break;
default:
break; /* ignore unknown types */
}
key++;
}
+ fp->h_slider = fp_slider_value(fp, &h_axis);
+ fp->v_slider = fp_slider_value(fp, &v_axis);
+
input_sync(fp->dev);
}
@@ -161,6 +234,37 @@ static irqreturn_t fp_interrupt(struct serio *serio, unsigned char data,
return IRQ_HANDLED;
}
+static ssize_t v_slider_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct serio *serio = to_serio_port(dev);
+ struct evifpanel *fp = serio_get_drvdata(serio);
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", fp->v_slider);
+}
+
+static ssize_t h_slider_show(struct device *dev, struct device_attribute *attr,
+ char *buf)
+{
+ struct serio *serio = to_serio_port(dev);
+ struct evifpanel *fp = serio_get_drvdata(serio);
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", fp->h_slider);
+}
+
+static DEVICE_ATTR_RO(v_slider);
+static DEVICE_ATTR_RO(h_slider);
+
+static struct attribute *attrs[] = {
+ &dev_attr_v_slider.attr,
+ &dev_attr_h_slider.attr,
+ NULL,
+};
+
+struct attribute_group fp_attrs = {
+ .attrs = attrs,
+};
+
static void fp_set_device_attrs(struct evifpanel *fp)
{
snprintf(fp->name, sizeof(fp->name),
@@ -210,6 +314,11 @@ static int fp_connect(struct serio *serio, struct serio_driver *drv)
goto fail2;
}
fp_request_fw_ver(fp);
+ error = sysfs_create_group(&serio->dev.kobj, &fp_attrs);
+ if (error) {
+ dev_err(&serio->dev, "failed to add sysfs group\n");
+ goto sysfs_fail;
+ }
error = input_register_device(input_dev);
if (error) {
@@ -221,6 +330,8 @@ static int fp_connect(struct serio *serio, struct serio_driver *drv)
fail3:
serio_close(serio);
+sysfs_fail:
+ sysfs_remove_group(&serio->dev.kobj, &fp_attrs);
fail2:
serio_set_drvdata(serio, NULL);
fail1:
@@ -236,6 +347,7 @@ static void fp_disconnect(struct serio *serio)
struct evifpanel *fp = serio_get_drvdata(serio);
input_unregister_device(fp->dev);
+ sysfs_remove_group(&serio->dev.kobj, &fp_attrs);
serio_close(serio);
serio_set_drvdata(serio, NULL);
kfree(fp);
--
2.1.4
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