drivers/media/IR/ir-core-priv.h

   1 /*
   2  * Remote Controller core raw events header
   3  *
   4  * Copyright (C) 2010 by Mauro Carvalho Chehab <mchehab@redhat.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation version 2 of the License.
   9  *
  10  *  This program is distributed in the hope that it will be useful,
  11  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  *  GNU General Public License for more details.
  14  */
  15
  16 #ifndef _IR_RAW_EVENT
  17 #define _IR_RAW_EVENT
  18
  19 #include <linux/slab.h>
  20 #include <media/ir-core.h>
  21
  22 struct ir_raw_handler {
  23         struct list_head list;
  24
  25         int (*decode)(struct input_dev *input_dev, struct ir_raw_event event);
  26         int (*raw_register)(struct input_dev *input_dev);
  27         int (*raw_unregister)(struct input_dev *input_dev);
  28 };
  29
  30 struct ir_raw_event_ctrl {
  31         struct work_struct              rx_work;        /* for the rx decoding workqueue */
  32         struct kfifo                    kfifo;          /* fifo for the pulse/space durations */
  33         ktime_t                         last_event;     /* when last event occurred */
  34         enum raw_event_type             last_type;      /* last event type */
  35         struct input_dev                *input_dev;     /* pointer to the parent input_dev */
  36 };
  37
  38 /* macros for IR decoders */
  39 static inline bool geq_margin(unsigned d1, unsigned d2, unsigned margin) {
  40         return d1 > (d2 - margin);
  41 }
  42
  43 static inline bool eq_margin(unsigned d1, unsigned d2, unsigned margin) {
  44         return ((d1 > (d2 - margin)) && (d1 < (d2 + margin)));
  45 }
  46
  47 static inline bool is_transition(struct ir_raw_event *x, struct ir_raw_event *y) {
  48         return x->pulse != y->pulse;
  49 }
  50
  51 static inline void decrease_duration(struct ir_raw_event *ev, unsigned duration) {
  52         if (duration > ev->duration)
  53                 ev->duration = 0;
  54         else
  55                 ev->duration -= duration;
  56 }
  57
  58 #define TO_US(duration)                 (((duration) + 500) / 1000)
  59 #define TO_STR(is_pulse)                ((is_pulse) ? "pulse" : "space")
  60 #define IS_RESET(ev)                    (ev.duration == 0)
  61
  62 /*
  63  * Routines from ir-sysfs.c - Meant to be called only internally inside
  64  * ir-core
  65  */
  66
  67 int ir_register_class(struct input_dev *input_dev);
  68 void ir_unregister_class(struct input_dev *input_dev);
  69
  70 /*
  71  * Routines from ir-raw-event.c to be used internally and by decoders
  72  */
  73 int ir_raw_event_register(struct input_dev *input_dev);
  74 void ir_raw_event_unregister(struct input_dev *input_dev);
  75 int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler);
  76 void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler);
  77 void ir_raw_init(void);
  78
  79
  80 /*
  81  * Decoder initialization code
  82  *
  83  * Those load logic are called during ir-core init, and automatically
  84  * loads the compiled decoders for their usage with IR raw events
  85  */
  86
  87 /* from ir-nec-decoder.c */
  88 #ifdef CONFIG_IR_NEC_DECODER_MODULE
  89 #define load_nec_decode()       request_module("ir-nec-decoder")
  90 #else
  91 #define load_nec_decode()       0
  92 #endif
  93
  94 /* from ir-rc5-decoder.c */
  95 #ifdef CONFIG_IR_RC5_DECODER_MODULE
  96 #define load_rc5_decode()       request_module("ir-rc5-decoder")
  97 #else
  98 #define load_rc5_decode()       0
  99 #endif
 100
 101 /* from ir-rc6-decoder.c */
 102 #ifdef CONFIG_IR_RC6_DECODER_MODULE
 103 #define load_rc6_decode()       request_module("ir-rc6-decoder")
 104 #else
 105 #define load_rc6_decode()       0
 106 #endif
 107
 108 #endif /* _IR_RAW_EVENT */