drivers/input/touchscreen/ts_filter_linear.h

   1 #ifndef __TS_FILTER_LINEAR_H__
   2 #define __TS_FILTER_LINEAR_H__
   3
   4 #include "ts_filter.h"
   5 #include <linux/kobject.h>
   6
   7 /*
   8  * Touchscreen linear filter.
   9  *
  10  * Copyright (C) 2008 by Openmoko, Inc.
  11  * Author: Nelson Castillo <arhuaco@freaks-unidos.net>
  12  *
  13  */
  14
  15 #define TS_FILTER_LINEAR_NCONSTANTS 7
  16
  17 /* sysfs */
  18
  19 struct ts_filter_linear;
  20
  21 struct const_obj {
  22         struct ts_filter_linear *tsfl;
  23         struct kobject kobj;
  24 };
  25
  26 #define to_const_obj(x) container_of(x, struct const_obj, kobj)
  27
  28 struct const_attribute {
  29         struct attribute attr;
  30         ssize_t (*show)(struct const_obj *const, struct const_attribute *attr,
  31                         char *buf);
  32         ssize_t (*store)(struct const_obj *const, struct const_attribute *attr,
  33                          const char *buf, size_t count);
  34 };
  35
  36 #define to_const_attr(x) container_of(x, struct const_attribute, attr)
  37
  38 /* filter configuration */
  39
  40 struct ts_filter_linear_configuration {
  41         int constants[TS_FILTER_LINEAR_NCONSTANTS];
  42         int coord0;
  43         int coord1;
  44 };
  45
  46 /* the filter */
  47
  48 struct ts_filter_linear {
  49         struct ts_filter tsf;
  50         struct ts_filter_linear_configuration *config;
  51
  52         int constants[TS_FILTER_LINEAR_NCONSTANTS];
  53
  54         /* sysfs */
  55         struct const_obj c_obj;
  56         struct kobj_type const_ktype;
  57         struct const_attribute kattrs[TS_FILTER_LINEAR_NCONSTANTS];
  58         struct attribute *attrs[TS_FILTER_LINEAR_NCONSTANTS + 1];
  59         char attr_names[TS_FILTER_LINEAR_NCONSTANTS][2];
  60 };
  61
  62 extern struct ts_filter_api ts_filter_linear_api;
  63
  64 #endif