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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Copyright (C) 2008 by Openmoko, Inc.
* Author: Nelson Castillo <arhuaco@freaks-unidos.net>
* All rights reserved.
*
* Linearly scale touchscreen values.
*
* Expose the TS_FILTER_LINEAR_NCONSTANTS for the linear transformation
* using sysfs.
*
*/
#include "ts_filter_linear.h"
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/string.h>
/* sysfs functions */
static ssize_t const_attr_show(struct kobject *kobj,
struct attribute *attr,
char *buf)
{
struct const_attribute *a = to_const_attr(attr);
return a->show(to_const_obj(kobj), a, buf);
}
static ssize_t const_attr_store(struct kobject *kobj,
struct attribute *attr,
const char *buf, size_t len)
{
struct const_attribute *a = to_const_attr(attr);
return a->store(to_const_obj(kobj), a, buf, len);
}
static struct sysfs_ops const_sysfs_ops = {
.show = const_attr_show,
.store = const_attr_store,
};
static void const_release(struct kobject *kobj)
{
kfree(to_const_obj(kobj)->tsfl);
}
static ssize_t const_show(struct const_obj *obj, struct const_attribute *attr,
char *buf)
{
int who;
sscanf(attr->attr.name, "%d", &who);
return sprintf(buf, "%d\n", obj->tsfl->constants[who]);
}
static ssize_t const_store(struct const_obj *obj, struct const_attribute *attr,
const char *buf, size_t count)
{
int who;
sscanf(attr->attr.name, "%d", &who);
sscanf(buf, "%d", &obj->tsfl->constants[who]);
return count;
}
/* filter functions */
static struct ts_filter *ts_filter_linear_create(struct platform_device *pdev,
void *conf, int count_coords)
{
struct ts_filter_linear *tsfl;
int i;
int ret;
tsfl = kzalloc(sizeof(struct ts_filter_linear), GFP_KERNEL);
if (!tsfl)
return NULL;
tsfl->config = (struct ts_filter_linear_configuration *)conf;
tsfl->tsf.count_coords = count_coords;
for (i = 0; i < TS_FILTER_LINEAR_NCONSTANTS; ++i) {
tsfl->constants[i] = tsfl->config->constants[i];
/* sysfs */
sprintf(tsfl->attr_names[i], "%d", i);
tsfl->kattrs[i].attr.name = tsfl->attr_names[i];
tsfl->kattrs[i].attr.mode = 0666;
tsfl->kattrs[i].show = const_show;
tsfl->kattrs[i].store = const_store;
tsfl->attrs[i] = &tsfl->kattrs[i].attr;
}
tsfl->attrs[i] = NULL;
tsfl->const_ktype.sysfs_ops = &const_sysfs_ops;
tsfl->const_ktype.release = const_release;
tsfl->const_ktype.default_attrs = tsfl->attrs;
tsfl->c_obj.tsfl = tsfl; /* kernel frees tsfl in const_release */
ret = kobject_init_and_add(&tsfl->c_obj.kobj, &tsfl->const_ktype,
&pdev->dev.kobj, "calibration");
if (ret) {
kobject_put(&tsfl->c_obj.kobj);
return NULL;
}
printk(KERN_INFO" Created Linear ts filter depth %d\n", count_coords);
return &tsfl->tsf;
}
static void ts_filter_linear_destroy(struct platform_device *pdev,
struct ts_filter *tsf)
{
struct ts_filter_linear *tsfl = (struct ts_filter_linear *)tsf;
/* kernel frees tsfl in const_release */
kobject_put(&tsfl->c_obj.kobj);
}
static void ts_filter_linear_clear(struct ts_filter *tsf)
{
if (tsf->next) /* chain */
(tsf->next->api->clear)(tsf->next);
}
static void ts_filter_linear_scale(struct ts_filter *tsf, int *coords)
{
struct ts_filter_linear *tsfl = (struct ts_filter_linear *)tsf;
int *k = tsfl->constants;
int c0 = coords[tsfl->config->coord0];
int c1 = coords[tsfl->config->coord1];
coords[tsfl->config->coord0] = (k[2] + k[0] * c0 + k[1] * c1) / k[6];
coords[tsfl->config->coord1] = (k[5] + k[3] * c0 + k[4] * c1) / k[6];
if (tsf->next)
(tsf->next->api->scale)(tsf->next, coords);
}
static int ts_filter_linear_process(struct ts_filter *tsf, int *coords)
{
if (tsf->next)
return (tsf->next->api->process)(tsf->next, coords);
return 1;
}
struct ts_filter_api ts_filter_linear_api = {
.create = ts_filter_linear_create,
.destroy = ts_filter_linear_destroy,
.clear = ts_filter_linear_clear,
.process = ts_filter_linear_process,
.scale = ts_filter_linear_scale,
};
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