--- /dev/null
+/* rc-ir-raw.c - handle IR pulse/space events
+ *
+ * Copyright (C) 2010 by Mauro Carvalho Chehab
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/export.h>
+#include <linux/kthread.h>
+#include <linux/mutex.h>
+#include <linux/kmod.h>
+#include <linux/sched.h>
+#include <linux/freezer.h>
+#include "rc-core-priv.h"
+
+/* Define the max number of pulse/space transitions to buffer */
+#define MAX_IR_EVENT_SIZE 512
+
+/* Used to keep track of IR raw clients, protected by ir_raw_handler_lock */
+static LIST_HEAD(ir_raw_client_list);
+
+/* Used to handle IR raw handler extensions */
+static DEFINE_MUTEX(ir_raw_handler_lock);
+static LIST_HEAD(ir_raw_handler_list);
+static u64 available_protocols;
+
+static int ir_raw_event_thread(void *data)
+{
+ struct ir_raw_event ev;
+ struct ir_raw_handler *handler;
+ struct ir_raw_event_ctrl *raw = (struct ir_raw_event_ctrl *)data;
+ int retval;
+
+ while (!kthread_should_stop()) {
+
+ spin_lock_irq(&raw->lock);
+ retval = kfifo_len(&raw->kfifo);
+
+ if (retval < sizeof(ev)) {
+ set_current_state(TASK_INTERRUPTIBLE);
+
+ if (kthread_should_stop())
+ set_current_state(TASK_RUNNING);
+
+ spin_unlock_irq(&raw->lock);
+ schedule();
+ continue;
+ }
+
+ retval = kfifo_out(&raw->kfifo, &ev, sizeof(ev));
+ spin_unlock_irq(&raw->lock);
+
+ mutex_lock(&ir_raw_handler_lock);
+ list_for_each_entry(handler, &ir_raw_handler_list, list)
+ handler->decode(raw->dev, ev);
+ raw->prev_ev = ev;
+ mutex_unlock(&ir_raw_handler_lock);
+ }
+
+ return 0;
+}
+
+/**
+ * ir_raw_event_store() - pass a pulse/space duration to the raw ir decoders
+ * @dev: the struct rc_dev device descriptor
+ * @ev: the struct ir_raw_event descriptor of the pulse/space
+ *
+ * This routine (which may be called from an interrupt context) stores a
+ * pulse/space duration for the raw ir decoding state machines. Pulses are
+ * signalled as positive values and spaces as negative values. A zero value
+ * will reset the decoding state machines.
+ */
+int ir_raw_event_store(struct rc_dev *dev, struct ir_raw_event *ev)
+{
+ if (!dev->raw)
+ return -EINVAL;
+
+ IR_dprintk(2, "sample: (%05dus %s)\n",
+ TO_US(ev->duration), TO_STR(ev->pulse));
+
+ if (kfifo_in(&dev->raw->kfifo, ev, sizeof(*ev)) != sizeof(*ev))
+ return -ENOMEM;
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_store);
+
+/**
+ * ir_raw_event_store_edge() - notify raw ir decoders of the start of a pulse/space
+ * @dev: the struct rc_dev device descriptor
+ * @type: the type of the event that has occurred
+ *
+ * This routine (which may be called from an interrupt context) is used to
+ * store the beginning of an ir pulse or space (or the start/end of ir
+ * reception) for the raw ir decoding state machines. This is used by
+ * hardware which does not provide durations directly but only interrupts
+ * (or similar events) on state change.
+ */
+int ir_raw_event_store_edge(struct rc_dev *dev, enum raw_event_type type)
+{
+ ktime_t now;
+ s64 delta; /* ns */
+ DEFINE_IR_RAW_EVENT(ev);
+ int rc = 0;
+ int delay;
+
+ if (!dev->raw)
+ return -EINVAL;
+
+ now = ktime_get();
+ delta = ktime_to_ns(ktime_sub(now, dev->raw->last_event));
+ delay = MS_TO_NS(dev->input_dev->rep[REP_DELAY]);
+
+ /* Check for a long duration since last event or if we're
+ * being called for the first time, note that delta can't
+ * possibly be negative.
+ */
+ if (delta > delay || !dev->raw->last_type)
+ type |= IR_START_EVENT;
+ else
+ ev.duration = delta;
+
+ if (type & IR_START_EVENT)
+ ir_raw_event_reset(dev);
+ else if (dev->raw->last_type & IR_SPACE) {
+ ev.pulse = false;
+ rc = ir_raw_event_store(dev, &ev);
+ } else if (dev->raw->last_type & IR_PULSE) {
+ ev.pulse = true;
+ rc = ir_raw_event_store(dev, &ev);
+ } else
+ return 0;
+
+ dev->raw->last_event = now;
+ dev->raw->last_type = type;
+ return rc;
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_store_edge);
+
+/**
+ * ir_raw_event_store_with_filter() - pass next pulse/space to decoders with some processing
+ * @dev: the struct rc_dev device descriptor
+ * @type: the type of the event that has occurred
+ *
+ * This routine (which may be called from an interrupt context) works
+ * in similar manner to ir_raw_event_store_edge.
+ * This routine is intended for devices with limited internal buffer
+ * It automerges samples of same type, and handles timeouts. Returns non-zero
+ * if the event was added, and zero if the event was ignored due to idle
+ * processing.
+ */
+int ir_raw_event_store_with_filter(struct rc_dev *dev, struct ir_raw_event *ev)
+{
+ if (!dev->raw)
+ return -EINVAL;
+
+ /* Ignore spaces in idle mode */
+ if (dev->idle && !ev->pulse)
+ return 0;
+ else if (dev->idle)
+ ir_raw_event_set_idle(dev, false);
+
+ if (!dev->raw->this_ev.duration)
+ dev->raw->this_ev = *ev;
+ else if (ev->pulse == dev->raw->this_ev.pulse)
+ dev->raw->this_ev.duration += ev->duration;
+ else {
+ ir_raw_event_store(dev, &dev->raw->this_ev);
+ dev->raw->this_ev = *ev;
+ }
+
+ /* Enter idle mode if nessesary */
+ if (!ev->pulse && dev->timeout &&
+ dev->raw->this_ev.duration >= dev->timeout)
+ ir_raw_event_set_idle(dev, true);
+
+ return 1;
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_store_with_filter);
+
+/**
+ * ir_raw_event_set_idle() - provide hint to rc-core when the device is idle or not
+ * @dev: the struct rc_dev device descriptor
+ * @idle: whether the device is idle or not
+ */
+void ir_raw_event_set_idle(struct rc_dev *dev, bool idle)
+{
+ if (!dev->raw)
+ return;
+
+ IR_dprintk(2, "%s idle mode\n", idle ? "enter" : "leave");
+
+ if (idle) {
+ dev->raw->this_ev.timeout = true;
+ ir_raw_event_store(dev, &dev->raw->this_ev);
+ init_ir_raw_event(&dev->raw->this_ev);
+ }
+
+ if (dev->s_idle)
+ dev->s_idle(dev, idle);
+
+ dev->idle = idle;
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_set_idle);
+
+/**
+ * ir_raw_event_handle() - schedules the decoding of stored ir data
+ * @dev: the struct rc_dev device descriptor
+ *
+ * This routine will tell rc-core to start decoding stored ir data.
+ */
+void ir_raw_event_handle(struct rc_dev *dev)
+{
+ unsigned long flags;
+
+ if (!dev->raw)
+ return;
+
+ spin_lock_irqsave(&dev->raw->lock, flags);
+ wake_up_process(dev->raw->thread);
+ spin_unlock_irqrestore(&dev->raw->lock, flags);
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_handle);
+
+/* used internally by the sysfs interface */
+u64
+ir_raw_get_allowed_protocols(void)
+{
+ u64 protocols;
+ mutex_lock(&ir_raw_handler_lock);
+ protocols = available_protocols;
+ mutex_unlock(&ir_raw_handler_lock);
+ return protocols;
+}
+
+static int change_protocol(struct rc_dev *dev, u64 *rc_type)
+{
+ /* the caller will update dev->enabled_protocols */
+ return 0;
+}
+
+/*
+ * Used to (un)register raw event clients
+ */
+int ir_raw_event_register(struct rc_dev *dev)
+{
+ int rc;
+ struct ir_raw_handler *handler;
+
+ if (!dev)
+ return -EINVAL;
+
+ dev->raw = kzalloc(sizeof(*dev->raw), GFP_KERNEL);
+ if (!dev->raw)
+ return -ENOMEM;
+
+ dev->raw->dev = dev;
+ dev->change_protocol = change_protocol;
+ rc = kfifo_alloc(&dev->raw->kfifo,
+ sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE,
+ GFP_KERNEL);
+ if (rc < 0)
+ goto out;
+
+ spin_lock_init(&dev->raw->lock);
+ dev->raw->thread = kthread_run(ir_raw_event_thread, dev->raw,
+ "rc%ld", dev->devno);
+
+ if (IS_ERR(dev->raw->thread)) {
+ rc = PTR_ERR(dev->raw->thread);
+ goto out;
+ }
+
+ mutex_lock(&ir_raw_handler_lock);
+ list_add_tail(&dev->raw->list, &ir_raw_client_list);
+ list_for_each_entry(handler, &ir_raw_handler_list, list)
+ if (handler->raw_register)
+ handler->raw_register(dev);
+ mutex_unlock(&ir_raw_handler_lock);
+
+ return 0;
+
+out:
+ kfree(dev->raw);
+ dev->raw = NULL;
+ return rc;
+}
+
+void ir_raw_event_unregister(struct rc_dev *dev)
+{
+ struct ir_raw_handler *handler;
+
+ if (!dev || !dev->raw)
+ return;
+
+ kthread_stop(dev->raw->thread);
+
+ mutex_lock(&ir_raw_handler_lock);
+ list_del(&dev->raw->list);
+ list_for_each_entry(handler, &ir_raw_handler_list, list)
+ if (handler->raw_unregister)
+ handler->raw_unregister(dev);
+ mutex_unlock(&ir_raw_handler_lock);
+
+ kfifo_free(&dev->raw->kfifo);
+ kfree(dev->raw);
+ dev->raw = NULL;
+}
+
+/*
+ * Extension interface - used to register the IR decoders
+ */
+
+int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler)
+{
+ struct ir_raw_event_ctrl *raw;
+
+ mutex_lock(&ir_raw_handler_lock);
+ list_add_tail(&ir_raw_handler->list, &ir_raw_handler_list);
+ if (ir_raw_handler->raw_register)
+ list_for_each_entry(raw, &ir_raw_client_list, list)
+ ir_raw_handler->raw_register(raw->dev);
+ available_protocols |= ir_raw_handler->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;
+
+ mutex_lock(&ir_raw_handler_lock);
+ list_del(&ir_raw_handler->list);
+ if (ir_raw_handler->raw_unregister)
+ list_for_each_entry(raw, &ir_raw_client_list, list)
+ ir_raw_handler->raw_unregister(raw->dev);
+ available_protocols &= ~ir_raw_handler->protocols;
+ mutex_unlock(&ir_raw_handler_lock);
+}
+EXPORT_SYMBOL(ir_raw_handler_unregister);
+
+void ir_raw_init(void)
+{
+ /* Load the decoder modules */
+
+ load_nec_decode();
+ load_rc5_decode();
+ load_rc6_decode();
+ load_jvc_decode();
+ load_sony_decode();
+ load_sanyo_decode();
+ load_sharp_decode();
+ load_mce_kbd_decode();
+ load_lirc_codec();
+ load_xmp_decode();
+
+ /* If needed, we may later add some init code. In this case,
+ it is needed to change the CONFIG_MODULE test at rc-core.h
+ */
+}
Code Review / kvmfornfv.git / blobdiff