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

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Remote Controller core raw events header
   4  *
   5  * Copyright (C) 2010 by Mauro Carvalho Chehab
   6  */
   7
   8 #ifndef _RC_CORE_PRIV
   9 #define _RC_CORE_PRIV
  10
  11 #define RC_DEV_MAX              256
  12 /* Define the max number of pulse/space transitions to buffer */
  13 #define MAX_IR_EVENT_SIZE       512
  14
  15 #include <linux/slab.h>
  16 #include <uapi/linux/bpf.h>
  17 #include <media/rc-core.h>
  18
  19 /**
  20  * rc_open - Opens a RC device
  21  *
  22  * @rdev: pointer to struct rc_dev.
  23  */
  24 int rc_open(struct rc_dev *rdev);
  25
  26 /**
  27  * rc_close - Closes a RC device
  28  *
  29  * @rdev: pointer to struct rc_dev.
  30  */
  31 void rc_close(struct rc_dev *rdev);
  32
  33 struct ir_raw_handler {
  34         struct list_head list;
  35
  36         u64 protocols; /* which are handled by this handler */
  37         int (*decode)(struct rc_dev *dev, struct ir_raw_event event);
  38         int (*encode)(enum rc_proto protocol, u32 scancode,
  39                       struct ir_raw_event *events, unsigned int max);
  40         u32 carrier;
  41         u32 min_timeout;
  42
  43         /* These two should only be used by the mce kbd decoder */
  44         int (*raw_register)(struct rc_dev *dev);
  45         int (*raw_unregister)(struct rc_dev *dev);
  46 };
  47
  48 struct ir_raw_event_ctrl {
  49         struct list_head                list;           /* to keep track of raw clients */
  50         struct task_struct              *thread;
  51         /* fifo for the pulse/space durations */
  52         DECLARE_KFIFO(kfifo, struct ir_raw_event, MAX_IR_EVENT_SIZE);
  53         ktime_t                         last_event;     /* when last event occurred */
  54         struct rc_dev                   *dev;           /* pointer to the parent rc_dev */
  55         /* handle delayed ir_raw_event_store_edge processing */
  56         spinlock_t                      edge_spinlock;
  57         struct timer_list               edge_handle;
  58
  59         /* raw decoder state follows */
  60         struct ir_raw_event prev_ev;
  61         struct ir_raw_event this_ev;
  62
  63 #ifdef CONFIG_BPF_LIRC_MODE2
  64         u32                             bpf_sample;
  65         struct bpf_prog_array __rcu     *progs;
  66 #endif
  67         struct nec_dec {
  68                 int state;
  69                 unsigned count;
  70                 u32 bits;
  71                 bool is_nec_x;
  72                 bool necx_repeat;
  73         } nec;
  74         struct rc5_dec {
  75                 int state;
  76                 u32 bits;
  77                 unsigned count;
  78                 bool is_rc5x;
  79         } rc5;
  80         struct rc6_dec {
  81                 int state;
  82                 u8 header;
  83                 u32 body;
  84                 bool toggle;
  85                 unsigned count;
  86                 unsigned wanted_bits;
  87         } rc6;
  88         struct sony_dec {
  89                 int state;
  90                 u32 bits;
  91                 unsigned count;
  92         } sony;
  93         struct jvc_dec {
  94                 int state;
  95                 u16 bits;
  96                 u16 old_bits;
  97                 unsigned count;
  98                 bool first;
  99                 bool toggle;
 100         } jvc;
 101         struct sanyo_dec {
 102                 int state;
 103                 unsigned count;
 104                 u64 bits;
 105         } sanyo;
 106         struct sharp_dec {
 107                 int state;
 108                 unsigned count;
 109                 u32 bits;
 110                 unsigned int pulse_len;
 111         } sharp;
 112         struct mce_kbd_dec {
 113                 /* locks key up timer */
 114                 spinlock_t keylock;
 115                 struct timer_list rx_timeout;
 116                 int state;
 117                 u8 header;
 118                 u32 body;
 119                 unsigned count;
 120                 unsigned wanted_bits;
 121         } mce_kbd;
 122         struct xmp_dec {
 123                 int state;
 124                 unsigned count;
 125                 u32 durations[16];
 126         } xmp;
 127         struct imon_dec {
 128                 int state;
 129                 int count;
 130                 int last_chk;
 131                 unsigned int bits;
 132                 bool stick_keyboard;
 133         } imon;
 134         struct rcmm_dec {
 135                 int state;
 136                 unsigned int count;
 137                 u32 bits;
 138         } rcmm;
 139 };
 140
 141 /* Mutex for locking raw IR processing and handler change */
 142 extern struct mutex ir_raw_handler_lock;
 143
 144 /* macros for IR decoders */
 145 static inline bool geq_margin(unsigned d1, unsigned d2, unsigned margin)
 146 {
 147         return d1 > (d2 - margin);
 148 }
 149
 150 static inline bool eq_margin(unsigned d1, unsigned d2, unsigned margin)
 151 {
 152         return ((d1 > (d2 - margin)) && (d1 < (d2 + margin)));
 153 }
 154
 155 static inline bool is_transition(struct ir_raw_event *x, struct ir_raw_event *y)
 156 {
 157         return x->pulse != y->pulse;
 158 }
 159
 160 static inline void decrease_duration(struct ir_raw_event *ev, unsigned duration)
 161 {
 162         if (duration > ev->duration)
 163                 ev->duration = 0;
 164         else
 165                 ev->duration -= duration;
 166 }
 167
 168 /* Returns true if event is normal pulse/space event */
 169 static inline bool is_timing_event(struct ir_raw_event ev)
 170 {
 171         return !ev.carrier_report && !ev.reset;
 172 }
 173
 174 #define TO_US(duration)                 DIV_ROUND_CLOSEST((duration), 1000)
 175 #define TO_STR(is_pulse)                ((is_pulse) ? "pulse" : "space")
 176
 177 /* functions for IR encoders */
 178 bool rc_validate_scancode(enum rc_proto proto, u32 scancode);
 179
 180 static inline void init_ir_raw_event_duration(struct ir_raw_event *ev,
 181                                               unsigned int pulse,
 182                                               u32 duration)
 183 {
 184         *ev = (struct ir_raw_event) {
 185                 .duration = duration,
 186                 .pulse = pulse
 187         };
 188 }
 189
 190 /**
 191  * struct ir_raw_timings_manchester - Manchester coding timings
 192  * @leader_pulse:       duration of leader pulse (if any) 0 if continuing
 193  *                      existing signal
 194  * @leader_space:       duration of leader space (if any)
 195  * @clock:              duration of each pulse/space in ns
 196  * @invert:             if set clock logic is inverted
 197  *                      (0 = space + pulse, 1 = pulse + space)
 198  * @trailer_space:      duration of trailer space in ns
 199  */
 200 struct ir_raw_timings_manchester {
 201         unsigned int leader_pulse;
 202         unsigned int leader_space;
 203         unsigned int clock;
 204         unsigned int invert:1;
 205         unsigned int trailer_space;
 206 };
 207
 208 int ir_raw_gen_manchester(struct ir_raw_event **ev, unsigned int max,
 209                           const struct ir_raw_timings_manchester *timings,
 210                           unsigned int n, u64 data);
 211
 212 /**
 213  * ir_raw_gen_pulse_space() - generate pulse and space raw events.
 214  * @ev:                 Pointer to pointer to next free raw event.
 215  *                      Will be incremented for each raw event written.
 216  * @max:                Pointer to number of raw events available in buffer.
 217  *                      Will be decremented for each raw event written.
 218  * @pulse_width:        Width of pulse in ns.
 219  * @space_width:        Width of space in ns.
 220  *
 221  * Returns:     0 on success.
 222  *              -ENOBUFS if there isn't enough buffer space to write both raw
 223  *              events. In this case @max events will have been written.
 224  */
 225 static inline int ir_raw_gen_pulse_space(struct ir_raw_event **ev,
 226                                          unsigned int *max,
 227                                          unsigned int pulse_width,
 228                                          unsigned int space_width)
 229 {
 230         if (!*max)
 231                 return -ENOBUFS;
 232         init_ir_raw_event_duration((*ev)++, 1, pulse_width);
 233         if (!--*max)
 234                 return -ENOBUFS;
 235         init_ir_raw_event_duration((*ev)++, 0, space_width);
 236         --*max;
 237         return 0;
 238 }
 239
 240 /**
 241  * struct ir_raw_timings_pd - pulse-distance modulation timings
 242  * @header_pulse:       duration of header pulse in ns (0 for none)
 243  * @header_space:       duration of header space in ns
 244  * @bit_pulse:          duration of bit pulse in ns
 245  * @bit_space:          duration of bit space (for logic 0 and 1) in ns
 246  * @trailer_pulse:      duration of trailer pulse 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_pd {
 251         unsigned int header_pulse;
 252         unsigned int header_space;
 253         unsigned int bit_pulse;
 254         unsigned int bit_space[2];
 255         unsigned int trailer_pulse;
 256         unsigned int trailer_space;
 257         unsigned int msb_first:1;
 258 };
 259
 260 int ir_raw_gen_pd(struct ir_raw_event **ev, unsigned int max,
 261                   const struct ir_raw_timings_pd *timings,
 262                   unsigned int n, u64 data);
 263
 264 /**
 265  * struct ir_raw_timings_pl - pulse-length modulation timings
 266  * @header_pulse:       duration of header pulse in ns (0 for none)
 267  * @bit_space:          duration of bit space in ns
 268  * @bit_pulse:          duration of bit pulse (for logic 0 and 1) in ns
 269  * @trailer_space:      duration of trailer space in ns
 270  * @msb_first:          1 if most significant bit is sent first
 271  */
 272 struct ir_raw_timings_pl {
 273         unsigned int header_pulse;
 274         unsigned int bit_space;
 275         unsigned int bit_pulse[2];
 276         unsigned int trailer_space;
 277         unsigned int msb_first:1;
 278 };
 279
 280 int ir_raw_gen_pl(struct ir_raw_event **ev, unsigned int max,
 281                   const struct ir_raw_timings_pl *timings,
 282                   unsigned int n, u64 data);
 283
 284 /*
 285  * Routines from rc-raw.c to be used internally and by decoders
 286  */
 287 u64 ir_raw_get_allowed_protocols(void);
 288 int ir_raw_event_prepare(struct rc_dev *dev);
 289 int ir_raw_event_register(struct rc_dev *dev);
 290 void ir_raw_event_free(struct rc_dev *dev);
 291 void ir_raw_event_unregister(struct rc_dev *dev);
 292 int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler);
 293 void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler);
 294 void ir_raw_load_modules(u64 *protocols);
 295 void ir_raw_init(void);
 296
 297 /*
 298  * lirc interface
 299  */
 300 #ifdef CONFIG_LIRC
 301 int lirc_dev_init(void);
 302 void lirc_dev_exit(void);
 303 void ir_lirc_raw_event(struct rc_dev *dev, struct ir_raw_event ev);
 304 void ir_lirc_scancode_event(struct rc_dev *dev, struct lirc_scancode *lsc);
 305 int ir_lirc_register(struct rc_dev *dev);
 306 void ir_lirc_unregister(struct rc_dev *dev);
 307 struct rc_dev *rc_dev_get_from_fd(int fd);
 308 #else
 309 static inline int lirc_dev_init(void) { return 0; }
 310 static inline void lirc_dev_exit(void) {}
 311 static inline void ir_lirc_raw_event(struct rc_dev *dev,
 312                                      struct ir_raw_event ev) { }
 313 static inline void ir_lirc_scancode_event(struct rc_dev *dev,
 314                                           struct lirc_scancode *lsc) { }
 315 static inline int ir_lirc_register(struct rc_dev *dev) { return 0; }
 316 static inline void ir_lirc_unregister(struct rc_dev *dev) { }
 317 #endif
 318
 319 /*
 320  * bpf interface
 321  */
 322 #ifdef CONFIG_BPF_LIRC_MODE2
 323 void lirc_bpf_free(struct rc_dev *dev);
 324 void lirc_bpf_run(struct rc_dev *dev, u32 sample);
 325 #else
 326 static inline void lirc_bpf_free(struct rc_dev *dev) { }
 327 static inline void lirc_bpf_run(struct rc_dev *dev, u32 sample) { }
 328 #endif
 329
 330 #endif /* _RC_CORE_PRIV */