326 lines
8.5 KiB
C
326 lines
8.5 KiB
C
/*
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* SPDX-License-Identifier: GPL-2.0
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* Remote Controller core raw events header
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*
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* Copyright (C) 2010 by Mauro Carvalho Chehab
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*/
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#ifndef _RC_CORE_PRIV
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#define _RC_CORE_PRIV
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#define RC_DEV_MAX 256
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/* Define the max number of pulse/space transitions to buffer */
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#define MAX_IR_EVENT_SIZE 512
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#include <linux/slab.h>
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#include <uapi/linux/bpf.h>
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#include <media/rc-core.h>
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/**
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* rc_open - Opens a RC device
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*
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* @rdev: pointer to struct rc_dev.
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*/
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int rc_open(struct rc_dev *rdev);
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/**
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* rc_close - Closes a RC device
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*
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* @rdev: pointer to struct rc_dev.
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*/
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void rc_close(struct rc_dev *rdev);
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struct ir_raw_handler {
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struct list_head list;
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u64 protocols; /* which are handled by this handler */
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int (*decode)(struct rc_dev *dev, struct ir_raw_event event);
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int (*encode)(enum rc_proto protocol, u32 scancode,
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struct ir_raw_event *events, unsigned int max);
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u32 carrier;
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u32 min_timeout;
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/* These two should only be used by the mce kbd decoder */
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int (*raw_register)(struct rc_dev *dev);
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int (*raw_unregister)(struct rc_dev *dev);
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};
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struct ir_raw_event_ctrl {
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struct list_head list; /* to keep track of raw clients */
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struct task_struct *thread;
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/* fifo for the pulse/space durations */
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DECLARE_KFIFO(kfifo, struct ir_raw_event, MAX_IR_EVENT_SIZE);
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ktime_t last_event; /* when last event occurred */
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struct rc_dev *dev; /* pointer to the parent rc_dev */
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/* handle delayed ir_raw_event_store_edge processing */
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spinlock_t edge_spinlock;
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struct timer_list edge_handle;
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/* raw decoder state follows */
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struct ir_raw_event prev_ev;
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struct ir_raw_event this_ev;
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#ifdef CONFIG_BPF_LIRC_MODE2
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u32 bpf_sample;
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struct bpf_prog_array __rcu *progs;
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#endif
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struct nec_dec {
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int state;
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unsigned count;
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u32 bits;
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bool is_nec_x;
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bool necx_repeat;
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} nec;
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struct rc5_dec {
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int state;
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u32 bits;
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unsigned count;
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bool is_rc5x;
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} rc5;
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struct rc6_dec {
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int state;
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u8 header;
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u32 body;
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bool toggle;
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unsigned count;
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unsigned wanted_bits;
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} rc6;
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struct sony_dec {
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int state;
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u32 bits;
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unsigned count;
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} sony;
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struct jvc_dec {
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int state;
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u16 bits;
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u16 old_bits;
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unsigned count;
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bool first;
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bool toggle;
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} jvc;
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struct sanyo_dec {
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int state;
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unsigned count;
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u64 bits;
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} sanyo;
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struct sharp_dec {
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int state;
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unsigned count;
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u32 bits;
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unsigned int pulse_len;
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} sharp;
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struct mce_kbd_dec {
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/* locks key up timer */
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spinlock_t keylock;
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struct timer_list rx_timeout;
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int state;
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u8 header;
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u32 body;
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unsigned count;
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unsigned wanted_bits;
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} mce_kbd;
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struct xmp_dec {
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int state;
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unsigned count;
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u32 durations[16];
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} xmp;
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struct imon_dec {
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int state;
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int count;
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int last_chk;
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unsigned int bits;
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bool stick_keyboard;
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} imon;
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};
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/* Mutex for locking raw IR processing and handler change */
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extern struct mutex ir_raw_handler_lock;
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/* macros for IR decoders */
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static inline bool geq_margin(unsigned d1, unsigned d2, unsigned margin)
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{
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return d1 > (d2 - margin);
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}
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static inline bool eq_margin(unsigned d1, unsigned d2, unsigned margin)
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{
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return ((d1 > (d2 - margin)) && (d1 < (d2 + margin)));
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}
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static inline bool is_transition(struct ir_raw_event *x, struct ir_raw_event *y)
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{
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return x->pulse != y->pulse;
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}
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static inline void decrease_duration(struct ir_raw_event *ev, unsigned duration)
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{
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if (duration > ev->duration)
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ev->duration = 0;
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else
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ev->duration -= duration;
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}
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/* Returns true if event is normal pulse/space event */
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static inline bool is_timing_event(struct ir_raw_event ev)
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{
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return !ev.carrier_report && !ev.reset;
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}
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#define TO_US(duration) DIV_ROUND_CLOSEST((duration), 1000)
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#define TO_STR(is_pulse) ((is_pulse) ? "pulse" : "space")
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/* functions for IR encoders */
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bool rc_validate_scancode(enum rc_proto proto, u32 scancode);
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static inline void init_ir_raw_event_duration(struct ir_raw_event *ev,
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unsigned int pulse,
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u32 duration)
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{
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*ev = (struct ir_raw_event) {
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.duration = duration,
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.pulse = pulse
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};
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}
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/**
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* struct ir_raw_timings_manchester - Manchester coding timings
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* @leader_pulse: duration of leader pulse (if any) 0 if continuing
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* existing signal
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* @leader_space: duration of leader space (if any)
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* @clock: duration of each pulse/space in ns
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* @invert: if set clock logic is inverted
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* (0 = space + pulse, 1 = pulse + space)
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* @trailer_space: duration of trailer space in ns
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*/
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struct ir_raw_timings_manchester {
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unsigned int leader_pulse;
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unsigned int leader_space;
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unsigned int clock;
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unsigned int invert:1;
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unsigned int trailer_space;
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};
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int ir_raw_gen_manchester(struct ir_raw_event **ev, unsigned int max,
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const struct ir_raw_timings_manchester *timings,
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unsigned int n, u64 data);
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/**
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* ir_raw_gen_pulse_space() - generate pulse and space raw events.
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* @ev: Pointer to pointer to next free raw event.
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* Will be incremented for each raw event written.
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* @max: Pointer to number of raw events available in buffer.
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* Will be decremented for each raw event written.
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* @pulse_width: Width of pulse in ns.
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* @space_width: Width of space in ns.
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*
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* Returns: 0 on success.
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* -ENOBUFS if there isn't enough buffer space to write both raw
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* events. In this case @max events will have been written.
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*/
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static inline int ir_raw_gen_pulse_space(struct ir_raw_event **ev,
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unsigned int *max,
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unsigned int pulse_width,
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unsigned int space_width)
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{
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if (!*max)
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return -ENOBUFS;
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init_ir_raw_event_duration((*ev)++, 1, pulse_width);
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if (!--*max)
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return -ENOBUFS;
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init_ir_raw_event_duration((*ev)++, 0, space_width);
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--*max;
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return 0;
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}
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/**
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* struct ir_raw_timings_pd - pulse-distance modulation timings
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* @header_pulse: duration of header pulse in ns (0 for none)
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* @header_space: duration of header space in ns
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* @bit_pulse: duration of bit pulse in ns
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* @bit_space: duration of bit space (for logic 0 and 1) in ns
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* @trailer_pulse: duration of trailer pulse in ns
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* @trailer_space: duration of trailer space in ns
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* @msb_first: 1 if most significant bit is sent first
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*/
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struct ir_raw_timings_pd {
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unsigned int header_pulse;
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unsigned int header_space;
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unsigned int bit_pulse;
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unsigned int bit_space[2];
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unsigned int trailer_pulse;
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unsigned int trailer_space;
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unsigned int msb_first:1;
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};
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int ir_raw_gen_pd(struct ir_raw_event **ev, unsigned int max,
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const struct ir_raw_timings_pd *timings,
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unsigned int n, u64 data);
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/**
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* struct ir_raw_timings_pl - pulse-length modulation timings
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* @header_pulse: duration of header pulse in ns (0 for none)
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* @bit_space: duration of bit space in ns
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* @bit_pulse: duration of bit pulse (for logic 0 and 1) in ns
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* @trailer_space: duration of trailer space in ns
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* @msb_first: 1 if most significant bit is sent first
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*/
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struct ir_raw_timings_pl {
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unsigned int header_pulse;
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unsigned int bit_space;
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unsigned int bit_pulse[2];
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unsigned int trailer_space;
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unsigned int msb_first:1;
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};
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int ir_raw_gen_pl(struct ir_raw_event **ev, unsigned int max,
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const struct ir_raw_timings_pl *timings,
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unsigned int n, u64 data);
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/*
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* Routines from rc-raw.c to be used internally and by decoders
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*/
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u64 ir_raw_get_allowed_protocols(void);
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int ir_raw_event_prepare(struct rc_dev *dev);
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int ir_raw_event_register(struct rc_dev *dev);
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void ir_raw_event_free(struct rc_dev *dev);
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void ir_raw_event_unregister(struct rc_dev *dev);
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int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler);
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void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler);
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void ir_raw_load_modules(u64 *protocols);
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void ir_raw_init(void);
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/*
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* lirc interface
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*/
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#ifdef CONFIG_LIRC
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int lirc_dev_init(void);
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void lirc_dev_exit(void);
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void ir_lirc_raw_event(struct rc_dev *dev, struct ir_raw_event ev);
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void ir_lirc_scancode_event(struct rc_dev *dev, struct lirc_scancode *lsc);
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int ir_lirc_register(struct rc_dev *dev);
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void ir_lirc_unregister(struct rc_dev *dev);
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struct rc_dev *rc_dev_get_from_fd(int fd);
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#else
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static inline int lirc_dev_init(void) { return 0; }
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static inline void lirc_dev_exit(void) {}
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static inline void ir_lirc_raw_event(struct rc_dev *dev,
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struct ir_raw_event ev) { }
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static inline void ir_lirc_scancode_event(struct rc_dev *dev,
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struct lirc_scancode *lsc) { }
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static inline int ir_lirc_register(struct rc_dev *dev) { return 0; }
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static inline void ir_lirc_unregister(struct rc_dev *dev) { }
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#endif
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/*
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* bpf interface
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*/
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#ifdef CONFIG_BPF_LIRC_MODE2
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void lirc_bpf_free(struct rc_dev *dev);
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void lirc_bpf_run(struct rc_dev *dev, u32 sample);
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#else
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static inline void lirc_bpf_free(struct rc_dev *dev) { }
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static inline void lirc_bpf_run(struct rc_dev *dev, u32 sample) { }
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#endif
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#endif /* _RC_CORE_PRIV */
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