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04ad30112a
Use codespell to fix lots of typos over frontends. Manually verified to avoid false-positives. Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> Acked-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
720 lines
19 KiB
C
720 lines
19 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// rc-ir-raw.c - handle IR pulse/space events
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//
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// Copyright (C) 2010 by Mauro Carvalho Chehab
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#include <linux/export.h>
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#include <linux/kthread.h>
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#include <linux/mutex.h>
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#include <linux/kmod.h>
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#include <linux/sched.h>
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#include "rc-core-priv.h"
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/* Used to keep track of IR raw clients, protected by ir_raw_handler_lock */
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static LIST_HEAD(ir_raw_client_list);
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/* Used to handle IR raw handler extensions */
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DEFINE_MUTEX(ir_raw_handler_lock);
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static LIST_HEAD(ir_raw_handler_list);
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static atomic64_t available_protocols = ATOMIC64_INIT(0);
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static int ir_raw_event_thread(void *data)
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{
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struct ir_raw_event ev;
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struct ir_raw_handler *handler;
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struct ir_raw_event_ctrl *raw = data;
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struct rc_dev *dev = raw->dev;
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while (1) {
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mutex_lock(&ir_raw_handler_lock);
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while (kfifo_out(&raw->kfifo, &ev, 1)) {
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if (is_timing_event(ev)) {
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if (ev.duration == 0)
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dev_warn_once(&dev->dev, "nonsensical timing event of duration 0");
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if (is_timing_event(raw->prev_ev) &&
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!is_transition(&ev, &raw->prev_ev))
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dev_warn_once(&dev->dev, "two consecutive events of type %s",
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TO_STR(ev.pulse));
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if (raw->prev_ev.reset && ev.pulse == 0)
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dev_warn_once(&dev->dev, "timing event after reset should be pulse");
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}
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list_for_each_entry(handler, &ir_raw_handler_list, list)
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if (dev->enabled_protocols &
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handler->protocols || !handler->protocols)
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handler->decode(dev, ev);
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ir_lirc_raw_event(dev, ev);
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raw->prev_ev = ev;
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}
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mutex_unlock(&ir_raw_handler_lock);
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set_current_state(TASK_INTERRUPTIBLE);
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if (kthread_should_stop()) {
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__set_current_state(TASK_RUNNING);
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break;
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} else if (!kfifo_is_empty(&raw->kfifo))
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set_current_state(TASK_RUNNING);
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schedule();
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}
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return 0;
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}
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/**
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* ir_raw_event_store() - pass a pulse/space duration to the raw ir decoders
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* @dev: the struct rc_dev device descriptor
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* @ev: the struct ir_raw_event descriptor of the pulse/space
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*
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* This routine (which may be called from an interrupt context) stores a
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* pulse/space duration for the raw ir decoding state machines. Pulses are
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* signalled as positive values and spaces as negative values. A zero value
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* will reset the decoding state machines.
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*/
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int ir_raw_event_store(struct rc_dev *dev, struct ir_raw_event *ev)
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{
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if (!dev->raw)
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return -EINVAL;
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dev_dbg(&dev->dev, "sample: (%05dus %s)\n",
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TO_US(ev->duration), TO_STR(ev->pulse));
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if (!kfifo_put(&dev->raw->kfifo, *ev)) {
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dev_err(&dev->dev, "IR event FIFO is full!\n");
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return -ENOSPC;
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}
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return 0;
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}
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EXPORT_SYMBOL_GPL(ir_raw_event_store);
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/**
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* ir_raw_event_store_edge() - notify raw ir decoders of the start of a pulse/space
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* @dev: the struct rc_dev device descriptor
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* @pulse: true for pulse, false for space
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*
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* This routine (which may be called from an interrupt context) is used to
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* store the beginning of an ir pulse or space (or the start/end of ir
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* reception) for the raw ir decoding state machines. This is used by
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* hardware which does not provide durations directly but only interrupts
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* (or similar events) on state change.
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*/
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int ir_raw_event_store_edge(struct rc_dev *dev, bool pulse)
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{
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ktime_t now;
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struct ir_raw_event ev = {};
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if (!dev->raw)
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return -EINVAL;
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now = ktime_get();
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ev.duration = ktime_to_ns(ktime_sub(now, dev->raw->last_event));
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ev.pulse = !pulse;
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return ir_raw_event_store_with_timeout(dev, &ev);
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}
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EXPORT_SYMBOL_GPL(ir_raw_event_store_edge);
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/*
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* ir_raw_event_store_with_timeout() - pass a pulse/space duration to the raw
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* ir decoders, schedule decoding and
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* timeout
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* @dev: the struct rc_dev device descriptor
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* @ev: the struct ir_raw_event descriptor of the pulse/space
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*
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* This routine (which may be called from an interrupt context) stores a
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* pulse/space duration for the raw ir decoding state machines, schedules
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* decoding and generates a timeout.
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*/
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int ir_raw_event_store_with_timeout(struct rc_dev *dev, struct ir_raw_event *ev)
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{
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ktime_t now;
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int rc = 0;
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if (!dev->raw)
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return -EINVAL;
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now = ktime_get();
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spin_lock(&dev->raw->edge_spinlock);
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rc = ir_raw_event_store(dev, ev);
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dev->raw->last_event = now;
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/* timer could be set to timeout (125ms by default) */
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if (!timer_pending(&dev->raw->edge_handle) ||
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time_after(dev->raw->edge_handle.expires,
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jiffies + msecs_to_jiffies(15))) {
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mod_timer(&dev->raw->edge_handle,
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jiffies + msecs_to_jiffies(15));
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}
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spin_unlock(&dev->raw->edge_spinlock);
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return rc;
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}
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EXPORT_SYMBOL_GPL(ir_raw_event_store_with_timeout);
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/**
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* ir_raw_event_store_with_filter() - pass next pulse/space to decoders with some processing
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* @dev: the struct rc_dev device descriptor
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* @ev: the event that has occurred
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*
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* This routine (which may be called from an interrupt context) works
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* in similar manner to ir_raw_event_store_edge.
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* This routine is intended for devices with limited internal buffer
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* It automerges samples of same type, and handles timeouts. Returns non-zero
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* if the event was added, and zero if the event was ignored due to idle
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* processing.
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*/
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int ir_raw_event_store_with_filter(struct rc_dev *dev, struct ir_raw_event *ev)
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{
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if (!dev->raw)
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return -EINVAL;
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/* Ignore spaces in idle mode */
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if (dev->idle && !ev->pulse)
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return 0;
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else if (dev->idle)
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ir_raw_event_set_idle(dev, false);
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if (!dev->raw->this_ev.duration)
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dev->raw->this_ev = *ev;
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else if (ev->pulse == dev->raw->this_ev.pulse)
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dev->raw->this_ev.duration += ev->duration;
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else {
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ir_raw_event_store(dev, &dev->raw->this_ev);
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dev->raw->this_ev = *ev;
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}
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/* Enter idle mode if necessary */
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if (!ev->pulse && dev->timeout &&
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dev->raw->this_ev.duration >= dev->timeout)
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ir_raw_event_set_idle(dev, true);
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return 1;
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}
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EXPORT_SYMBOL_GPL(ir_raw_event_store_with_filter);
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/**
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* ir_raw_event_set_idle() - provide hint to rc-core when the device is idle or not
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* @dev: the struct rc_dev device descriptor
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* @idle: whether the device is idle or not
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*/
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void ir_raw_event_set_idle(struct rc_dev *dev, bool idle)
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{
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if (!dev->raw)
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return;
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dev_dbg(&dev->dev, "%s idle mode\n", idle ? "enter" : "leave");
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if (idle) {
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dev->raw->this_ev.timeout = true;
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ir_raw_event_store(dev, &dev->raw->this_ev);
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dev->raw->this_ev = (struct ir_raw_event) {};
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}
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if (dev->s_idle)
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dev->s_idle(dev, idle);
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dev->idle = idle;
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}
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EXPORT_SYMBOL_GPL(ir_raw_event_set_idle);
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/**
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* ir_raw_event_handle() - schedules the decoding of stored ir data
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* @dev: the struct rc_dev device descriptor
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*
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* This routine will tell rc-core to start decoding stored ir data.
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*/
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void ir_raw_event_handle(struct rc_dev *dev)
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{
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if (!dev->raw || !dev->raw->thread)
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return;
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wake_up_process(dev->raw->thread);
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}
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EXPORT_SYMBOL_GPL(ir_raw_event_handle);
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/* used internally by the sysfs interface */
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u64
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ir_raw_get_allowed_protocols(void)
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{
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return atomic64_read(&available_protocols);
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}
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static int change_protocol(struct rc_dev *dev, u64 *rc_proto)
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{
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struct ir_raw_handler *handler;
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u32 timeout = 0;
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mutex_lock(&ir_raw_handler_lock);
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list_for_each_entry(handler, &ir_raw_handler_list, list) {
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if (!(dev->enabled_protocols & handler->protocols) &&
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(*rc_proto & handler->protocols) && handler->raw_register)
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handler->raw_register(dev);
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if ((dev->enabled_protocols & handler->protocols) &&
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!(*rc_proto & handler->protocols) &&
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handler->raw_unregister)
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handler->raw_unregister(dev);
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}
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mutex_unlock(&ir_raw_handler_lock);
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if (!dev->max_timeout)
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return 0;
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mutex_lock(&ir_raw_handler_lock);
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list_for_each_entry(handler, &ir_raw_handler_list, list) {
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if (handler->protocols & *rc_proto) {
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if (timeout < handler->min_timeout)
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timeout = handler->min_timeout;
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}
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}
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mutex_unlock(&ir_raw_handler_lock);
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if (timeout == 0)
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timeout = IR_DEFAULT_TIMEOUT;
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else
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timeout += MS_TO_NS(10);
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if (timeout < dev->min_timeout)
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timeout = dev->min_timeout;
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else if (timeout > dev->max_timeout)
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timeout = dev->max_timeout;
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if (dev->s_timeout)
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dev->s_timeout(dev, timeout);
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else
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dev->timeout = timeout;
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return 0;
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}
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static void ir_raw_disable_protocols(struct rc_dev *dev, u64 protocols)
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{
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mutex_lock(&dev->lock);
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dev->enabled_protocols &= ~protocols;
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mutex_unlock(&dev->lock);
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}
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/**
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* ir_raw_gen_manchester() - Encode data with Manchester (bi-phase) modulation.
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* @ev: Pointer to pointer to next free event. *@ev is incremented for
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* each raw event filled.
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* @max: Maximum number of raw events to fill.
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* @timings: Manchester modulation timings.
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* @n: Number of bits of data.
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* @data: Data bits to encode.
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*
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* Encodes the @n least significant bits of @data using Manchester (bi-phase)
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* modulation with the timing characteristics described by @timings, writing up
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* to @max raw IR events using the *@ev pointer.
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*
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* Returns: 0 on success.
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* -ENOBUFS if there isn't enough space in the array to fit the
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* full encoded data. In this case all @max events will have been
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* written.
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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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bool need_pulse;
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u64 i;
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int ret = -ENOBUFS;
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i = BIT_ULL(n - 1);
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if (timings->leader_pulse) {
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if (!max--)
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return ret;
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init_ir_raw_event_duration((*ev), 1, timings->leader_pulse);
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if (timings->leader_space) {
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if (!max--)
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return ret;
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init_ir_raw_event_duration(++(*ev), 0,
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timings->leader_space);
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}
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} else {
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/* continue existing signal */
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--(*ev);
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}
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/* from here on *ev will point to the last event rather than the next */
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while (n && i > 0) {
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need_pulse = !(data & i);
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if (timings->invert)
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need_pulse = !need_pulse;
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if (need_pulse == !!(*ev)->pulse) {
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(*ev)->duration += timings->clock;
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} else {
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if (!max--)
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goto nobufs;
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init_ir_raw_event_duration(++(*ev), need_pulse,
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timings->clock);
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}
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if (!max--)
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goto nobufs;
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init_ir_raw_event_duration(++(*ev), !need_pulse,
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timings->clock);
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i >>= 1;
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}
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if (timings->trailer_space) {
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if (!(*ev)->pulse)
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(*ev)->duration += timings->trailer_space;
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else if (!max--)
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goto nobufs;
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else
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init_ir_raw_event_duration(++(*ev), 0,
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timings->trailer_space);
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}
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ret = 0;
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nobufs:
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/* point to the next event rather than last event before returning */
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++(*ev);
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return ret;
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}
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EXPORT_SYMBOL(ir_raw_gen_manchester);
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/**
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* ir_raw_gen_pd() - Encode data to raw events with pulse-distance modulation.
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* @ev: Pointer to pointer to next free event. *@ev is incremented for
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* each raw event filled.
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* @max: Maximum number of raw events to fill.
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* @timings: Pulse distance modulation timings.
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* @n: Number of bits of data.
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* @data: Data bits to encode.
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*
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* Encodes the @n least significant bits of @data using pulse-distance
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* modulation with the timing characteristics described by @timings, writing up
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* to @max raw IR events using the *@ev pointer.
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*
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* Returns: 0 on success.
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* -ENOBUFS if there isn't enough space in the array to fit the
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* full encoded data. In this case all @max events will have been
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* written.
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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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int i;
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int ret;
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unsigned int space;
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if (timings->header_pulse) {
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ret = ir_raw_gen_pulse_space(ev, &max, timings->header_pulse,
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timings->header_space);
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if (ret)
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return ret;
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}
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if (timings->msb_first) {
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for (i = n - 1; i >= 0; --i) {
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space = timings->bit_space[(data >> i) & 1];
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ret = ir_raw_gen_pulse_space(ev, &max,
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timings->bit_pulse,
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space);
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if (ret)
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return ret;
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}
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} else {
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for (i = 0; i < n; ++i, data >>= 1) {
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space = timings->bit_space[data & 1];
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ret = ir_raw_gen_pulse_space(ev, &max,
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timings->bit_pulse,
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space);
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if (ret)
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return ret;
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}
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}
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ret = ir_raw_gen_pulse_space(ev, &max, timings->trailer_pulse,
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timings->trailer_space);
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return ret;
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}
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EXPORT_SYMBOL(ir_raw_gen_pd);
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/**
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* ir_raw_gen_pl() - Encode data to raw events with pulse-length modulation.
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* @ev: Pointer to pointer to next free event. *@ev is incremented for
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* each raw event filled.
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* @max: Maximum number of raw events to fill.
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* @timings: Pulse distance modulation timings.
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* @n: Number of bits of data.
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* @data: Data bits to encode.
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*
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* Encodes the @n least significant bits of @data using space-distance
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* modulation with the timing characteristics described by @timings, writing up
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* to @max raw IR events using the *@ev pointer.
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*
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* Returns: 0 on success.
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* -ENOBUFS if there isn't enough space in the array to fit the
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* full encoded data. In this case all @max events will have been
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* written.
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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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int i;
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int ret = -ENOBUFS;
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unsigned int pulse;
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if (!max--)
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return ret;
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init_ir_raw_event_duration((*ev)++, 1, timings->header_pulse);
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if (timings->msb_first) {
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for (i = n - 1; i >= 0; --i) {
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if (!max--)
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return ret;
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init_ir_raw_event_duration((*ev)++, 0,
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timings->bit_space);
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if (!max--)
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return ret;
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pulse = timings->bit_pulse[(data >> i) & 1];
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init_ir_raw_event_duration((*ev)++, 1, pulse);
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}
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} else {
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for (i = 0; i < n; ++i, data >>= 1) {
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if (!max--)
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return ret;
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init_ir_raw_event_duration((*ev)++, 0,
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timings->bit_space);
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if (!max--)
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return ret;
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pulse = timings->bit_pulse[data & 1];
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init_ir_raw_event_duration((*ev)++, 1, pulse);
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}
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}
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if (!max--)
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return ret;
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init_ir_raw_event_duration((*ev)++, 0, timings->trailer_space);
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return 0;
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}
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EXPORT_SYMBOL(ir_raw_gen_pl);
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/**
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* ir_raw_encode_scancode() - Encode a scancode as raw events
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*
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* @protocol: protocol
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* @scancode: scancode filter describing a single scancode
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* @events: array of raw events to write into
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* @max: max number of raw events
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*
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* Attempts to encode the scancode as raw events.
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*
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* Returns: The number of events written.
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* -ENOBUFS if there isn't enough space in the array to fit the
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* encoding. In this case all @max events will have been written.
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* -EINVAL if the scancode is ambiguous or invalid, or if no
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* compatible encoder was found.
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*/
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int ir_raw_encode_scancode(enum rc_proto protocol, u32 scancode,
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struct ir_raw_event *events, unsigned int max)
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{
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struct ir_raw_handler *handler;
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int ret = -EINVAL;
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u64 mask = 1ULL << protocol;
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ir_raw_load_modules(&mask);
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mutex_lock(&ir_raw_handler_lock);
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list_for_each_entry(handler, &ir_raw_handler_list, list) {
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if (handler->protocols & mask && handler->encode) {
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ret = handler->encode(protocol, scancode, events, max);
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if (ret >= 0 || ret == -ENOBUFS)
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break;
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}
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}
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mutex_unlock(&ir_raw_handler_lock);
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return ret;
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}
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EXPORT_SYMBOL(ir_raw_encode_scancode);
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/**
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* ir_raw_edge_handle() - Handle ir_raw_event_store_edge() processing
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*
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* @t: timer_list
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*
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* This callback is armed by ir_raw_event_store_edge(). It does two things:
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* first of all, rather than calling ir_raw_event_handle() for each
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* edge and waking up the rc thread, 15 ms after the first edge
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* ir_raw_event_handle() is called. Secondly, generate a timeout event
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* no more IR is received after the rc_dev timeout.
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*/
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static void ir_raw_edge_handle(struct timer_list *t)
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{
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struct ir_raw_event_ctrl *raw = from_timer(raw, t, edge_handle);
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struct rc_dev *dev = raw->dev;
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unsigned long flags;
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ktime_t interval;
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spin_lock_irqsave(&dev->raw->edge_spinlock, flags);
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interval = ktime_sub(ktime_get(), dev->raw->last_event);
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if (ktime_to_ns(interval) >= dev->timeout) {
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struct ir_raw_event ev = {
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.timeout = true,
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.duration = ktime_to_ns(interval)
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};
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ir_raw_event_store(dev, &ev);
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} else {
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mod_timer(&dev->raw->edge_handle,
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jiffies + nsecs_to_jiffies(dev->timeout -
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ktime_to_ns(interval)));
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}
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spin_unlock_irqrestore(&dev->raw->edge_spinlock, flags);
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ir_raw_event_handle(dev);
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}
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/**
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* ir_raw_encode_carrier() - Get carrier used for protocol
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*
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* @protocol: protocol
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*
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* Attempts to find the carrier for the specified protocol
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*
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* Returns: The carrier in Hz
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* -EINVAL if the protocol is invalid, or if no
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* compatible encoder was found.
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*/
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int ir_raw_encode_carrier(enum rc_proto protocol)
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{
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struct ir_raw_handler *handler;
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int ret = -EINVAL;
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u64 mask = BIT_ULL(protocol);
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mutex_lock(&ir_raw_handler_lock);
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list_for_each_entry(handler, &ir_raw_handler_list, list) {
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if (handler->protocols & mask && handler->encode) {
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ret = handler->carrier;
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break;
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}
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}
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mutex_unlock(&ir_raw_handler_lock);
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return ret;
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}
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EXPORT_SYMBOL(ir_raw_encode_carrier);
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|
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/*
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* Used to (un)register raw event clients
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*/
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int ir_raw_event_prepare(struct rc_dev *dev)
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{
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if (!dev)
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return -EINVAL;
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dev->raw = kzalloc(sizeof(*dev->raw), GFP_KERNEL);
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if (!dev->raw)
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return -ENOMEM;
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dev->raw->dev = dev;
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dev->change_protocol = change_protocol;
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dev->idle = true;
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spin_lock_init(&dev->raw->edge_spinlock);
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timer_setup(&dev->raw->edge_handle, ir_raw_edge_handle, 0);
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INIT_KFIFO(dev->raw->kfifo);
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return 0;
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}
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|
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int ir_raw_event_register(struct rc_dev *dev)
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{
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struct task_struct *thread;
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|
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thread = kthread_run(ir_raw_event_thread, dev->raw, "rc%u", dev->minor);
|
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if (IS_ERR(thread))
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return PTR_ERR(thread);
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|
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dev->raw->thread = thread;
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|
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mutex_lock(&ir_raw_handler_lock);
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list_add_tail(&dev->raw->list, &ir_raw_client_list);
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mutex_unlock(&ir_raw_handler_lock);
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|
|
|
return 0;
|
|
}
|
|
|
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void ir_raw_event_free(struct rc_dev *dev)
|
|
{
|
|
if (!dev)
|
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return;
|
|
|
|
kfree(dev->raw);
|
|
dev->raw = NULL;
|
|
}
|
|
|
|
void ir_raw_event_unregister(struct rc_dev *dev)
|
|
{
|
|
struct ir_raw_handler *handler;
|
|
|
|
if (!dev || !dev->raw)
|
|
return;
|
|
|
|
kthread_stop(dev->raw->thread);
|
|
del_timer_sync(&dev->raw->edge_handle);
|
|
|
|
mutex_lock(&ir_raw_handler_lock);
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|
list_del(&dev->raw->list);
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|
list_for_each_entry(handler, &ir_raw_handler_list, list)
|
|
if (handler->raw_unregister &&
|
|
(handler->protocols & dev->enabled_protocols))
|
|
handler->raw_unregister(dev);
|
|
|
|
lirc_bpf_free(dev);
|
|
|
|
ir_raw_event_free(dev);
|
|
|
|
/*
|
|
* A user can be calling bpf(BPF_PROG_{QUERY|ATTACH|DETACH}), so
|
|
* ensure that the raw member is null on unlock; this is how
|
|
* "device gone" is checked.
|
|
*/
|
|
mutex_unlock(&ir_raw_handler_lock);
|
|
}
|
|
|
|
/*
|
|
* Extension interface - used to register the IR decoders
|
|
*/
|
|
|
|
int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler)
|
|
{
|
|
mutex_lock(&ir_raw_handler_lock);
|
|
list_add_tail(&ir_raw_handler->list, &ir_raw_handler_list);
|
|
atomic64_or(ir_raw_handler->protocols, &available_protocols);
|
|
mutex_unlock(&ir_raw_handler_lock);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ir_raw_handler_register);
|
|
|
|
void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler)
|
|
{
|
|
struct ir_raw_event_ctrl *raw;
|
|
u64 protocols = ir_raw_handler->protocols;
|
|
|
|
mutex_lock(&ir_raw_handler_lock);
|
|
list_del(&ir_raw_handler->list);
|
|
list_for_each_entry(raw, &ir_raw_client_list, list) {
|
|
if (ir_raw_handler->raw_unregister &&
|
|
(raw->dev->enabled_protocols & protocols))
|
|
ir_raw_handler->raw_unregister(raw->dev);
|
|
ir_raw_disable_protocols(raw->dev, protocols);
|
|
}
|
|
atomic64_andnot(protocols, &available_protocols);
|
|
mutex_unlock(&ir_raw_handler_lock);
|
|
}
|
|
EXPORT_SYMBOL(ir_raw_handler_unregister);
|