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 #if IS_ENABLED(CONFIG_IR_NEC_DECODER)
  68         struct nec_dec {
  69                 int state;
  70                 unsigned count;
  71                 u32 bits;
  72                 bool is_nec_x;
  73                 bool necx_repeat;
  74         } nec;
  75 #endif
  76 #if IS_ENABLED(CONFIG_IR_RC5_DECODER)
  77         struct rc5_dec {
  78                 int state;
  79                 u32 bits;
  80                 unsigned count;
  81                 bool is_rc5x;
  82         } rc5;
  83 #endif
  84 #if IS_ENABLED(CONFIG_IR_RC6_DECODER)
  85         struct rc6_dec {
  86                 int state;
  87                 u8 header;
  88                 u32 body;
  89                 bool toggle;
  90                 unsigned count;
  91                 unsigned wanted_bits;
  92         } rc6;
  93 #endif
  94 #if IS_ENABLED(CONFIG_IR_SONY_DECODER)
  95         struct sony_dec {
  96                 int state;
  97                 u32 bits;
  98                 unsigned count;
  99         } sony;
 100 #endif
 101 #if IS_ENABLED(CONFIG_IR_JVC_DECODER)
 102         struct jvc_dec {
 103                 int state;
 104                 u16 bits;
 105                 u16 old_bits;
 106                 unsigned count;
 107                 bool first;
 108                 bool toggle;
 109         } jvc;
 110 #endif
 111 #if IS_ENABLED(CONFIG_IR_SANYO_DECODER)
 112         struct sanyo_dec {
 113                 int state;
 114                 unsigned count;
 115                 u64 bits;
 116         } sanyo;
 117 #endif
 118 #if IS_ENABLED(CONFIG_IR_SHARP_DECODER)
 119         struct sharp_dec {
 120                 int state;
 121                 unsigned count;
 122                 u32 bits;
 123                 unsigned int pulse_len;
 124         } sharp;
 125 #endif
 126 #if IS_ENABLED(CONFIG_IR_MCE_KBD_DECODER)
 127         struct mce_kbd_dec {
 128                 /* locks key up timer */
 129                 spinlock_t keylock;
 130                 struct timer_list rx_timeout;
 131                 int state;
 132                 u8 header;
 133                 u32 body;
 134                 unsigned count;
 135                 unsigned wanted_bits;
 136         } mce_kbd;
 137 #endif
 138 #if IS_ENABLED(CONFIG_IR_XMP_DECODER)
 139         struct xmp_dec {
 140                 int state;
 141                 unsigned count;
 142                 u32 durations[16];
 143         } xmp;
 144 #endif
 145 #if IS_ENABLED(CONFIG_IR_IMON_DECODER)
 146         struct imon_dec {
 147                 int state;
 148                 int count;
 149                 int last_chk;
 150                 unsigned int bits;
 151                 bool stick_keyboard;
 152         } imon;
 153 #endif
 154 #if IS_ENABLED(CONFIG_IR_RCMM_DECODER)
 155         struct rcmm_dec {
 156                 int state;
 157                 unsigned int count;
 158                 u32 bits;
 159         } rcmm;
 160 #endif
 161 };
 162
 163 /* Mutex for locking raw IR processing and handler change */
 164 extern struct mutex ir_raw_handler_lock;
 165
 166 /* macros for IR decoders */
 167 static inline bool geq_margin(unsigned d1, unsigned d2, unsigned margin)
 168 {
 169         return d1 > (d2 - margin);
 170 }
 171
 172 static inline bool eq_margin(unsigned d1, unsigned d2, unsigned margin)
 173 {
 174         return ((d1 > (d2 - margin)) && (d1 < (d2 + margin)));
 175 }
 176
 177 static inline bool is_transition(struct ir_raw_event *x, struct ir_raw_event *y)
 178 {
 179         return x->pulse != y->pulse;
 180 }
 181
 182 static inline void decrease_duration(struct ir_raw_event *ev, unsigned duration)
 183 {
 184         if (duration > ev->duration)
 185                 ev->duration = 0;
 186         else
 187                 ev->duration -= duration;
 188 }
 189
 190 /* Returns true if event is normal pulse/space event */
 191 static inline bool is_timing_event(struct ir_raw_event ev)
 192 {
 193         return !ev.carrier_report && !ev.reset;
 194 }
 195
 196 #define TO_STR(is_pulse)                ((is_pulse) ? "pulse" : "space")
 197
 198 /* functions for IR encoders */
 199 bool rc_validate_scancode(enum rc_proto proto, u32 scancode);
 200
 201 static inline void init_ir_raw_event_duration(struct ir_raw_event *ev,
 202                                               unsigned int pulse,
 203                                               u32 duration)
 204 {
 205         *ev = (struct ir_raw_event) {
 206                 .duration = duration,
 207                 .pulse = pulse
 208         };
 209 }
 210
 211 /**
 212  * struct ir_raw_timings_manchester - Manchester coding timings
 213  * @leader_pulse:       duration of leader pulse (if any) 0 if continuing
 214  *                      existing signal
 215  * @leader_space:       duration of leader space (if any)
 216  * @clock:              duration of each pulse/space in ns
 217  * @invert:             if set clock logic is inverted
 218  *                      (0 = space + pulse, 1 = pulse + space)
 219  * @trailer_space:      duration of trailer space in ns
 220  */
 221 struct ir_raw_timings_manchester {
 222         unsigned int leader_pulse;
 223         unsigned int leader_space;
 224         unsigned int clock;
 225         unsigned int invert:1;
 226         unsigned int trailer_space;
 227 };
 228
 229 int ir_raw_gen_manchester(struct ir_raw_event **ev, unsigned int max,
 230                           const struct ir_raw_timings_manchester *timings,
 231                           unsigned int n, u64 data);
 232
 233 /**
 234  * ir_raw_gen_pulse_space() - generate pulse and space raw events.
 235  * @ev:                 Pointer to pointer to next free raw event.
 236  *                      Will be incremented for each raw event written.
 237  * @max:                Pointer to number of raw events available in buffer.
 238  *                      Will be decremented for each raw event written.
 239  * @pulse_width:        Width of pulse in ns.
 240  * @space_width:        Width of space in ns.
 241  *
 242  * Returns:     0 on success.
 243  *              -ENOBUFS if there isn't enough buffer space to write both raw
 244  *              events. In this case @max events will have been written.
 245  */
 246 static inline int ir_raw_gen_pulse_space(struct ir_raw_event **ev,
 247                                          unsigned int *max,
 248                                          unsigned int pulse_width,
 249                                          unsigned int space_width)
 250 {
 251         if (!*max)
 252                 return -ENOBUFS;
 253         init_ir_raw_event_duration((*ev)++, 1, pulse_width);
 254         if (!--*max)
 255                 return -ENOBUFS;
 256         init_ir_raw_event_duration((*ev)++, 0, space_width);
 257         --*max;
 258         return 0;
 259 }
 260
 261 /**
 262  * struct ir_raw_timings_pd - pulse-distance modulation timings
 263  * @header_pulse:       duration of header pulse in ns (0 for none)
 264  * @header_space:       duration of header space in ns
 265  * @bit_pulse:          duration of bit pulse in ns
 266  * @bit_space:          duration of bit space (for logic 0 and 1) in ns
 267  * @trailer_pulse:      duration of trailer pulse in ns
 268  * @trailer_space:      duration of trailer space in ns
 269  * @msb_first:          1 if most significant bit is sent first
 270  */
 271 struct ir_raw_timings_pd {
 272         unsigned int header_pulse;
 273         unsigned int header_space;
 274         unsigned int bit_pulse;
 275         unsigned int bit_space[2];
 276         unsigned int trailer_pulse;
 277         unsigned int trailer_space;
 278         unsigned int msb_first:1;
 279 };
 280
 281 int ir_raw_gen_pd(struct ir_raw_event **ev, unsigned int max,
 282                   const struct ir_raw_timings_pd *timings,
 283                   unsigned int n, u64 data);
 284
 285 /**
 286  * struct ir_raw_timings_pl - pulse-length modulation timings
 287  * @header_pulse:       duration of header pulse in ns (0 for none)
 288  * @bit_space:          duration of bit space in ns
 289  * @bit_pulse:          duration of bit pulse (for logic 0 and 1) in ns
 290  * @trailer_space:      duration of trailer space in ns
 291  * @msb_first:          1 if most significant bit is sent first
 292  */
 293 struct ir_raw_timings_pl {
 294         unsigned int header_pulse;
 295         unsigned int bit_space;
 296         unsigned int bit_pulse[2];
 297         unsigned int trailer_space;
 298         unsigned int msb_first:1;
 299 };
 300
 301 int ir_raw_gen_pl(struct ir_raw_event **ev, unsigned int max,
 302                   const struct ir_raw_timings_pl *timings,
 303                   unsigned int n, u64 data);
 304
 305 /*
 306  * Routines from rc-raw.c to be used internally and by decoders
 307  */
 308 u64 ir_raw_get_allowed_protocols(void);
 309 int ir_raw_event_prepare(struct rc_dev *dev);
 310 int ir_raw_event_register(struct rc_dev *dev);
 311 void ir_raw_event_free(struct rc_dev *dev);
 312 void ir_raw_event_unregister(struct rc_dev *dev);
 313 int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler);
 314 void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler);
 315 void ir_raw_load_modules(u64 *protocols);
 316 void ir_raw_init(void);
 317
 318 /*
 319  * lirc interface
 320  */
 321 #ifdef CONFIG_LIRC
 322 int lirc_dev_init(void);
 323 void lirc_dev_exit(void);
 324 void lirc_raw_event(struct rc_dev *dev, struct ir_raw_event ev);
 325 void lirc_scancode_event(struct rc_dev *dev, struct lirc_scancode *lsc);
 326 int lirc_register(struct rc_dev *dev);
 327 void lirc_unregister(struct rc_dev *dev);
 328 struct rc_dev *rc_dev_get_from_fd(int fd);
 329 #else
 330 static inline int lirc_dev_init(void) { return 0; }
 331 static inline void lirc_dev_exit(void) {}
 332 static inline void lirc_raw_event(struct rc_dev *dev,
 333                                   struct ir_raw_event ev) { }
 334 static inline void lirc_scancode_event(struct rc_dev *dev,
 335                                        struct lirc_scancode *lsc) { }
 336 static inline int lirc_register(struct rc_dev *dev) { return 0; }
 337 static inline void lirc_unregister(struct rc_dev *dev) { }
 338 #endif
 339
 340 /*
 341  * bpf interface
 342  */
 343 #ifdef CONFIG_BPF_LIRC_MODE2
 344 void lirc_bpf_free(struct rc_dev *dev);
 345 void lirc_bpf_run(struct rc_dev *dev, u32 sample);
 346 #else
 347 static inline void lirc_bpf_free(struct rc_dev *dev) { }
 348 static inline void lirc_bpf_run(struct rc_dev *dev, u32 sample) { }
 349 #endif
 350
 351 #endif /* _RC_CORE_PRIV */