drivers/media/rc/rc-core-priv.h

   1 /*
   2  * Remote Controller core raw events header
   3  *
   4  * Copyright (C) 2010 by Mauro Carvalho Chehab
   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 _RC_CORE_PRIV
  17 #define _RC_CORE_PRIV
  18
  19 /* Define the max number of pulse/space transitions to buffer */
  20 #define MAX_IR_EVENT_SIZE       512
  21
  22 #include <linux/slab.h>
  23 #include <media/rc-core.h>
  24
  25 struct ir_raw_handler {
  26         struct list_head list;
  27
  28         u64 protocols; /* which are handled by this handler */
  29         int (*decode)(struct rc_dev *dev, struct ir_raw_event event);
  30         int (*encode)(enum rc_type protocol, u32 scancode,
  31                       struct ir_raw_event *events, unsigned int max);
  32
  33         /* These two should only be used by the lirc decoder */
  34         int (*raw_register)(struct rc_dev *dev);
  35         int (*raw_unregister)(struct rc_dev *dev);
  36 };
  37
  38 struct ir_raw_event_ctrl {
  39         struct list_head                list;           /* to keep track of raw clients */
  40         struct task_struct              *thread;
  41         /* fifo for the pulse/space durations */
  42         DECLARE_KFIFO(kfifo, struct ir_raw_event, MAX_IR_EVENT_SIZE);
  43         ktime_t                         last_event;     /* when last event occurred */
  44         enum raw_event_type             last_type;      /* last event type */
  45         struct rc_dev                   *dev;           /* pointer to the parent rc_dev */
  46
  47         /* raw decoder state follows */
  48         struct ir_raw_event prev_ev;
  49         struct ir_raw_event this_ev;
  50         struct nec_dec {
  51                 int state;
  52                 unsigned count;
  53                 u32 bits;
  54                 bool is_nec_x;
  55                 bool necx_repeat;
  56         } nec;
  57         struct rc5_dec {
  58                 int state;
  59                 u32 bits;
  60                 unsigned count;
  61                 bool is_rc5x;
  62         } rc5;
  63         struct rc6_dec {
  64                 int state;
  65                 u8 header;
  66                 u32 body;
  67                 bool toggle;
  68                 unsigned count;
  69                 unsigned wanted_bits;
  70         } rc6;
  71         struct sony_dec {
  72                 int state;
  73                 u32 bits;
  74                 unsigned count;
  75         } sony;
  76         struct jvc_dec {
  77                 int state;
  78                 u16 bits;
  79                 u16 old_bits;
  80                 unsigned count;
  81                 bool first;
  82                 bool toggle;
  83         } jvc;
  84         struct sanyo_dec {
  85                 int state;
  86                 unsigned count;
  87                 u64 bits;
  88         } sanyo;
  89         struct sharp_dec {
  90                 int state;
  91                 unsigned count;
  92                 u32 bits;
  93                 unsigned int pulse_len;
  94         } sharp;
  95         struct mce_kbd_dec {
  96                 struct input_dev *idev;
  97                 struct timer_list rx_timeout;
  98                 char name[64];
  99                 char phys[64];
 100                 int state;
 101                 u8 header;
 102                 u32 body;
 103                 unsigned count;
 104                 unsigned wanted_bits;
 105         } mce_kbd;
 106         struct lirc_codec {
 107                 struct rc_dev *dev;
 108                 struct lirc_driver *drv;
 109                 int carrier_low;
 110
 111                 ktime_t gap_start;
 112                 u64 gap_duration;
 113                 bool gap;
 114                 bool send_timeout_reports;
 115
 116         } lirc;
 117         struct xmp_dec {
 118                 int state;
 119                 unsigned count;
 120                 u32 durations[16];
 121         } xmp;
 122 };
 123
 124 /* macros for IR decoders */
 125 static inline bool geq_margin(unsigned d1, unsigned d2, unsigned margin)
 126 {
 127         return d1 > (d2 - margin);
 128 }
 129
 130 static inline bool eq_margin(unsigned d1, unsigned d2, unsigned margin)
 131 {
 132         return ((d1 > (d2 - margin)) && (d1 < (d2 + margin)));
 133 }
 134
 135 static inline bool is_transition(struct ir_raw_event *x, struct ir_raw_event *y)
 136 {
 137         return x->pulse != y->pulse;
 138 }
 139
 140 static inline void decrease_duration(struct ir_raw_event *ev, unsigned duration)
 141 {
 142         if (duration > ev->duration)
 143                 ev->duration = 0;
 144         else
 145                 ev->duration -= duration;
 146 }
 147
 148 /* Returns true if event is normal pulse/space event */
 149 static inline bool is_timing_event(struct ir_raw_event ev)
 150 {
 151         return !ev.carrier_report && !ev.reset;
 152 }
 153
 154 #define TO_US(duration)                 DIV_ROUND_CLOSEST((duration), 1000)
 155 #define TO_STR(is_pulse)                ((is_pulse) ? "pulse" : "space")
 156
 157 /* functions for IR encoders */
 158
 159 static inline void init_ir_raw_event_duration(struct ir_raw_event *ev,
 160                                               unsigned int pulse,
 161                                               u32 duration)
 162 {
 163         init_ir_raw_event(ev);
 164         ev->duration = duration;
 165         ev->pulse = pulse;
 166 }
 167
 168 /**
 169  * struct ir_raw_timings_manchester - Manchester coding timings
 170  * @leader:             duration of leader pulse (if any) 0 if continuing
 171  *                      existing signal (see @pulse_space_start)
 172  * @pulse_space_start:  1 for starting with pulse (0 for starting with space)
 173  * @clock:              duration of each pulse/space in ns
 174  * @invert:             if set clock logic is inverted
 175  *                      (0 = space + pulse, 1 = pulse + space)
 176  * @trailer_space:      duration of trailer space in ns
 177  */
 178 struct ir_raw_timings_manchester {
 179         unsigned int leader;
 180         unsigned int pulse_space_start:1;
 181         unsigned int clock;
 182         unsigned int invert:1;
 183         unsigned int trailer_space;
 184 };
 185
 186 int ir_raw_gen_manchester(struct ir_raw_event **ev, unsigned int max,
 187                           const struct ir_raw_timings_manchester *timings,
 188                           unsigned int n, u64 data);
 189
 190 /**
 191  * ir_raw_gen_pulse_space() - generate pulse and space raw events.
 192  * @ev:                 Pointer to pointer to next free raw event.
 193  *                      Will be incremented for each raw event written.
 194  * @max:                Pointer to number of raw events available in buffer.
 195  *                      Will be decremented for each raw event written.
 196  * @pulse_width:        Width of pulse in ns.
 197  * @space_width:        Width of space in ns.
 198  *
 199  * Returns:     0 on success.
 200  *              -ENOBUFS if there isn't enough buffer space to write both raw
 201  *              events. In this case @max events will have been written.
 202  */
 203 static inline int ir_raw_gen_pulse_space(struct ir_raw_event **ev,
 204                                          unsigned int *max,
 205                                          unsigned int pulse_width,
 206                                          unsigned int space_width)
 207 {
 208         if (!*max)
 209                 return -ENOBUFS;
 210         init_ir_raw_event_duration((*ev)++, 1, pulse_width);
 211         if (!--*max)
 212                 return -ENOBUFS;
 213         init_ir_raw_event_duration((*ev)++, 0, space_width);
 214         --*max;
 215         return 0;
 216 }
 217
 218 /**
 219  * struct ir_raw_timings_pd - pulse-distance modulation timings
 220  * @header_pulse:       duration of header pulse in ns (0 for none)
 221  * @header_space:       duration of header space in ns
 222  * @bit_pulse:          duration of bit pulse in ns
 223  * @bit_space:          duration of bit space (for logic 0 and 1) in ns
 224  * @trailer_pulse:      duration of trailer pulse in ns
 225  * @trailer_space:      duration of trailer space in ns
 226  * @msb_first:          1 if most significant bit is sent first
 227  */
 228 struct ir_raw_timings_pd {
 229         unsigned int header_pulse;
 230         unsigned int header_space;
 231         unsigned int bit_pulse;
 232         unsigned int bit_space[2];
 233         unsigned int trailer_pulse;
 234         unsigned int trailer_space;
 235         unsigned int msb_first:1;
 236 };
 237
 238 int ir_raw_gen_pd(struct ir_raw_event **ev, unsigned int max,
 239                   const struct ir_raw_timings_pd *timings,
 240                   unsigned int n, u64 data);
 241
 242 /**
 243  * struct ir_raw_timings_pl - pulse-length modulation timings
 244  * @header_pulse:       duration of header pulse in ns (0 for none)
 245  * @bit_space:          duration of bit space in ns
 246  * @bit_pulse:          duration of bit pulse (for logic 0 and 1) in ns
 247  * @trailer_space:      duration of trailer space in ns
 248  * @msb_first:          1 if most significant bit is sent first
 249  */
 250 struct ir_raw_timings_pl {
 251         unsigned int header_pulse;
 252         unsigned int bit_space;
 253         unsigned int bit_pulse[2];
 254         unsigned int trailer_space;
 255         unsigned int msb_first:1;
 256 };
 257
 258 int ir_raw_gen_pl(struct ir_raw_event **ev, unsigned int max,
 259                   const struct ir_raw_timings_pl *timings,
 260                   unsigned int n, u64 data);
 261
 262 /*
 263  * Routines from rc-raw.c to be used internally and by decoders
 264  */
 265 u64 ir_raw_get_allowed_protocols(void);
 266 int ir_raw_event_prepare(struct rc_dev *dev);
 267 int ir_raw_event_register(struct rc_dev *dev);
 268 void ir_raw_event_free(struct rc_dev *dev);
 269 void ir_raw_event_unregister(struct rc_dev *dev);
 270 int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler);
 271 void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler);
 272 void ir_raw_init(void);
 273
 274 /*
 275  * Decoder initialization code
 276  *
 277  * Those load logic are called during ir-core init, and automatically
 278  * loads the compiled decoders for their usage with IR raw events
 279  */
 280
 281 #endif /* _RC_CORE_PRIV */