![Sean Young](/assets/img/avatar_default.png)
The TechnoTrend USB IR Receiver sends 125 ISO URBs per second, even when there is no IR activity. Reduce the number of wake ups from the other drivers too. This saves about 0.25ms/s on a 2.4GHz Core 2 according to powertop. Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
377 lines
9.5 KiB
C
377 lines
9.5 KiB
C
/* ir-raw.c - handle IR pulse/space events
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*
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* Copyright (C) 2010 by Mauro Carvalho Chehab <mchehab@redhat.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*/
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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 <linux/freezer.h>
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#include "rc-core-priv.h"
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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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/* 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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static DEFINE_MUTEX(ir_raw_handler_lock);
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static LIST_HEAD(ir_raw_handler_list);
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static u64 available_protocols;
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#ifdef MODULE
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/* Used to load the decoders */
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static struct work_struct wq_load;
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#endif
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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 = (struct ir_raw_event_ctrl *)data;
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int retval;
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while (!kthread_should_stop()) {
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spin_lock_irq(&raw->lock);
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retval = kfifo_len(&raw->kfifo);
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if (retval < sizeof(ev)) {
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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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spin_unlock_irq(&raw->lock);
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schedule();
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continue;
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}
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retval = kfifo_out(&raw->kfifo, &ev, sizeof(ev));
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spin_unlock_irq(&raw->lock);
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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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handler->decode(raw->dev, ev);
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raw->prev_ev = ev;
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mutex_unlock(&ir_raw_handler_lock);
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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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IR_dprintk(2, "sample: (%05dus %s)\n",
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TO_US(ev->duration), TO_STR(ev->pulse));
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if (kfifo_in(&dev->raw->kfifo, ev, sizeof(*ev)) != sizeof(*ev))
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return -ENOMEM;
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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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* @type: the type of the event that has occurred
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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, enum raw_event_type type)
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{
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ktime_t now;
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s64 delta; /* ns */
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DEFINE_IR_RAW_EVENT(ev);
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int rc = 0;
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int delay;
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if (!dev->raw)
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return -EINVAL;
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now = ktime_get();
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delta = ktime_to_ns(ktime_sub(now, dev->raw->last_event));
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delay = MS_TO_NS(dev->input_dev->rep[REP_DELAY]);
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/* Check for a long duration since last event or if we're
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* being called for the first time, note that delta can't
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* possibly be negative.
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*/
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if (delta > delay || !dev->raw->last_type)
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type |= IR_START_EVENT;
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else
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ev.duration = delta;
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if (type & IR_START_EVENT)
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ir_raw_event_reset(dev);
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else if (dev->raw->last_type & IR_SPACE) {
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ev.pulse = false;
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rc = ir_raw_event_store(dev, &ev);
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} else if (dev->raw->last_type & IR_PULSE) {
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ev.pulse = true;
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rc = ir_raw_event_store(dev, &ev);
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} else
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return 0;
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dev->raw->last_event = now;
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dev->raw->last_type = type;
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return rc;
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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_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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* @type: the type of 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 nessesary */
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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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IR_dprintk(2, "%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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init_ir_raw_event(&dev->raw->this_ev);
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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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unsigned long flags;
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if (!dev->raw)
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return;
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spin_lock_irqsave(&dev->raw->lock, flags);
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wake_up_process(dev->raw->thread);
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spin_unlock_irqrestore(&dev->raw->lock, flags);
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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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u64 protocols;
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mutex_lock(&ir_raw_handler_lock);
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protocols = available_protocols;
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mutex_unlock(&ir_raw_handler_lock);
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return protocols;
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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_register(struct rc_dev *dev)
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{
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int rc;
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struct ir_raw_handler *handler;
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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->raw->enabled_protocols = ~0;
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rc = kfifo_alloc(&dev->raw->kfifo,
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sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE,
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GFP_KERNEL);
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if (rc < 0)
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goto out;
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spin_lock_init(&dev->raw->lock);
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dev->raw->thread = kthread_run(ir_raw_event_thread, dev->raw,
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"rc%ld", dev->devno);
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if (IS_ERR(dev->raw->thread)) {
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rc = PTR_ERR(dev->raw->thread);
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goto out;
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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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list_for_each_entry(handler, &ir_raw_handler_list, list)
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if (handler->raw_register)
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handler->raw_register(dev);
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mutex_unlock(&ir_raw_handler_lock);
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return 0;
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out:
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kfree(dev->raw);
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dev->raw = NULL;
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return rc;
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}
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void ir_raw_event_unregister(struct rc_dev *dev)
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{
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struct ir_raw_handler *handler;
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if (!dev || !dev->raw)
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return;
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kthread_stop(dev->raw->thread);
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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)
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if (handler->raw_unregister)
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handler->raw_unregister(dev);
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mutex_unlock(&ir_raw_handler_lock);
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kfifo_free(&dev->raw->kfifo);
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kfree(dev->raw);
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dev->raw = NULL;
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}
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/*
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* Extension interface - used to register the IR decoders
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*/
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int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler)
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{
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struct ir_raw_event_ctrl *raw;
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mutex_lock(&ir_raw_handler_lock);
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list_add_tail(&ir_raw_handler->list, &ir_raw_handler_list);
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if (ir_raw_handler->raw_register)
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list_for_each_entry(raw, &ir_raw_client_list, list)
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ir_raw_handler->raw_register(raw->dev);
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available_protocols |= ir_raw_handler->protocols;
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mutex_unlock(&ir_raw_handler_lock);
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return 0;
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}
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EXPORT_SYMBOL(ir_raw_handler_register);
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void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler)
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{
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struct ir_raw_event_ctrl *raw;
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mutex_lock(&ir_raw_handler_lock);
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list_del(&ir_raw_handler->list);
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if (ir_raw_handler->raw_unregister)
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list_for_each_entry(raw, &ir_raw_client_list, list)
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ir_raw_handler->raw_unregister(raw->dev);
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available_protocols &= ~ir_raw_handler->protocols;
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mutex_unlock(&ir_raw_handler_lock);
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}
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EXPORT_SYMBOL(ir_raw_handler_unregister);
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#ifdef MODULE
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static void init_decoders(struct work_struct *work)
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{
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/* Load the decoder modules */
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load_nec_decode();
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load_rc5_decode();
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load_rc6_decode();
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load_jvc_decode();
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load_sony_decode();
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load_sanyo_decode();
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load_mce_kbd_decode();
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load_lirc_codec();
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/* If needed, we may later add some init code. In this case,
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it is needed to change the CONFIG_MODULE test at rc-core.h
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*/
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}
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#endif
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void ir_raw_init(void)
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{
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#ifdef MODULE
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INIT_WORK(&wq_load, init_decoders);
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schedule_work(&wq_load);
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#endif
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}
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