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