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Date: Fri, 24 Jul 2015 10:43:21 -0700
From: Joshua Clayton <stillcompiling@...il.com>
To: Dmitry Torokhov <dmitry.torokhov@...il.com>
Cc: Dan Murphy <dmurphy@...com>, Nishanth Menon <nm@...com>,
Chanwoo Choi <cw00.choi@...sung.com>,
Jaewon Kim <jaewon02.kim@...sung.com>,
linux-kernel@...r.kernel.org, linux-input@...r.kernel.org,
Joshua Clayton <stillcompiling@...il.com>
Subject: [RFC PATCH 2/2] Input: evifpanel: show sliders through sysfs
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slider sysfs files will be superceded by input events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@...il.com>
---
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@...il.com>");
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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