1 files changed, 382 insertions, 0 deletions

diff --git a/drivers/media/rc/ir-raw-event.c b/drivers/media/rc/ir-raw-event.c
new file mode 100644
index 000000000000..a06a07e4e0b1
--- /dev/null
+++ b/drivers/media/rc/ir-raw-event.c
@@ -0,0 +1,382 @@
+/* ir-raw-event.c - handle IR Pulse/Space event
+ *
+ * Copyright (C) 2010 by Mauro Carvalho Chehab <mchehab@redhat.com>
+ *
+ * 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/kthread.h>
+#include <linux/mutex.h>
+#include <linux/sched.h>
+#include <linux/freezer.h>
+#include "ir-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;
+
+#ifdef MODULE
+/* Used to load the decoders */
+static struct work_struct wq_load;
+#endif
+
+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_out(&raw->kfifo, &ev, sizeof(ev));
+
+		if (!retval) {
+			set_current_state(TASK_INTERRUPTIBLE);
+
+			if (kthread_should_stop())
+				set_current_state(TASK_RUNNING);
+
+			spin_unlock_irq(&raw->lock);
+			schedule();
+			continue;
+		}
+
+		spin_unlock_irq(&raw->lock);
+
+
+		BUG_ON(retval != sizeof(ev));
+
+		mutex_lock(&ir_raw_handler_lock);
+		list_for_each_entry(handler, &ir_raw_handler_list, list)
+			handler->decode(raw->input_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
+ * @input_dev:	the struct input_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 input_dev *input_dev, struct ir_raw_event *ev)
+{
+	struct ir_input_dev *ir = input_get_drvdata(input_dev);
+
+	if (!ir->raw)
+		return -EINVAL;
+
+	IR_dprintk(2, "sample: (%05dus %s)\n",
+		TO_US(ev->duration), TO_STR(ev->pulse));
+
+	if (kfifo_in(&ir->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
+ * @input_dev:	the struct input_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 input_dev *input_dev, enum raw_event_type type)
+{
+	struct ir_input_dev	*ir = input_get_drvdata(input_dev);
+	ktime_t			now;
+	s64			delta; /* ns */
+	struct ir_raw_event	ev;
+	int			rc = 0;
+
+	if (!ir->raw)
+		return -EINVAL;
+
+	now = ktime_get();
+	delta = ktime_to_ns(ktime_sub(now, ir->raw->last_event));
+
+	/* 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.
+	 */
+	ev.duration = 0;
+	if (delta > IR_MAX_DURATION || !ir->raw->last_type)
+		type |= IR_START_EVENT;
+	else
+		ev.duration = delta;
+
+	if (type & IR_START_EVENT)
+		ir_raw_event_reset(input_dev);
+	else if (ir->raw->last_type & IR_SPACE) {
+		ev.pulse = false;
+		rc = ir_raw_event_store(input_dev, &ev);
+	} else if (ir->raw->last_type & IR_PULSE) {
+		ev.pulse = true;
+		rc = ir_raw_event_store(input_dev, &ev);
+	} else
+		return 0;
+
+	ir->raw->last_event = now;
+	ir->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
+ * @input_dev:	the struct input_dev device descriptor
+ * @type:	the type of the event that has occurred
+ *
+ * This routine (which may be called from an interrupt context) works
+ * in similiar 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
+ */
+int ir_raw_event_store_with_filter(struct input_dev *input_dev,
+						struct ir_raw_event *ev)
+{
+	struct ir_input_dev *ir = input_get_drvdata(input_dev);
+	struct ir_raw_event_ctrl *raw = ir->raw;
+
+	if (!raw || !ir->props)
+		return -EINVAL;
+
+	/* Ignore spaces in idle mode */
+	if (ir->idle && !ev->pulse)
+		return 0;
+	else if (ir->idle)
+		ir_raw_event_set_idle(input_dev, false);
+
+	if (!raw->this_ev.duration) {
+		raw->this_ev = *ev;
+	} else if (ev->pulse == raw->this_ev.pulse) {
+		raw->this_ev.duration += ev->duration;
+	} else {
+		ir_raw_event_store(input_dev, &raw->this_ev);
+		raw->this_ev = *ev;
+	}
+
+	/* Enter idle mode if nessesary */
+	if (!ev->pulse && ir->props->timeout &&
+		raw->this_ev.duration >= ir->props->timeout) {
+		ir_raw_event_set_idle(input_dev, true);
+	}
+	return 0;
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_store_with_filter);
+
+/**
+ * ir_raw_event_set_idle() - hint the ir core if device is receiving
+ * IR data or not
+ * @input_dev: the struct input_dev device descriptor
+ * @idle: the hint value
+ */
+void ir_raw_event_set_idle(struct input_dev *input_dev, bool idle)
+{
+	struct ir_input_dev *ir = input_get_drvdata(input_dev);
+	struct ir_raw_event_ctrl *raw = ir->raw;
+
+	if (!ir->props || !ir->raw)
+		return;
+
+	IR_dprintk(2, "%s idle mode\n", idle ? "enter" : "leave");
+
+	if (idle) {
+		raw->this_ev.timeout = true;
+		ir_raw_event_store(input_dev, &raw->this_ev);
+		init_ir_raw_event(&raw->this_ev);
+	}
+
+	if (ir->props->s_idle)
+		ir->props->s_idle(ir->props->priv, idle);
+	ir->idle = idle;
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_set_idle);
+
+/**
+ * ir_raw_event_handle() - schedules the decoding of stored ir data
+ * @input_dev:	the struct input_dev device descriptor
+ *
+ * This routine will signal the workqueue to start decoding stored ir data.
+ */
+void ir_raw_event_handle(struct input_dev *input_dev)
+{
+	struct ir_input_dev *ir = input_get_drvdata(input_dev);
+	unsigned long flags;
+
+	if (!ir->raw)
+		return;
+
+	spin_lock_irqsave(&ir->raw->lock, flags);
+	wake_up_process(ir->raw->thread);
+	spin_unlock_irqrestore(&ir->raw->lock, flags);
+}
+EXPORT_SYMBOL_GPL(ir_raw_event_handle);
+
+/* used internally by the sysfs interface */
+u64
+ir_raw_get_allowed_protocols()
+{
+	u64 protocols;
+	mutex_lock(&ir_raw_handler_lock);
+	protocols = available_protocols;
+	mutex_unlock(&ir_raw_handler_lock);
+	return protocols;
+}
+
+/*
+ * Used to (un)register raw event clients
+ */
+int ir_raw_event_register(struct input_dev *input_dev)
+{
+	struct ir_input_dev *ir = input_get_drvdata(input_dev);
+	int rc;
+	struct ir_raw_handler *handler;
+
+	ir->raw = kzalloc(sizeof(*ir->raw), GFP_KERNEL);
+	if (!ir->raw)
+		return -ENOMEM;
+
+	ir->raw->input_dev = input_dev;
+
+	ir->raw->enabled_protocols = ~0;
+	rc = kfifo_alloc(&ir->raw->kfifo, sizeof(s64) * MAX_IR_EVENT_SIZE,
+			 GFP_KERNEL);
+	if (rc < 0) {
+		kfree(ir->raw);
+		ir->raw = NULL;
+		return rc;
+	}
+
+	spin_lock_init(&ir->raw->lock);
+	ir->raw->thread = kthread_run(ir_raw_event_thread, ir->raw,
+			"rc%u",  (unsigned int)ir->devno);
+
+	if (IS_ERR(ir->raw->thread)) {
+		int ret = PTR_ERR(ir->raw->thread);
+
+		kfree(ir->raw);
+		ir->raw = NULL;
+		return ret;
+	}
+
+	mutex_lock(&ir_raw_handler_lock);
+	list_add_tail(&ir->raw->list, &ir_raw_client_list);
+	list_for_each_entry(handler, &ir_raw_handler_list, list)
+		if (handler->raw_register)
+			handler->raw_register(ir->raw->input_dev);
+	mutex_unlock(&ir_raw_handler_lock);
+
+	return 0;
+}
+
+void ir_raw_event_unregister(struct input_dev *input_dev)
+{
+	struct ir_input_dev *ir = input_get_drvdata(input_dev);
+	struct ir_raw_handler *handler;
+
+	if (!ir->raw)
+		return;
+
+	kthread_stop(ir->raw->thread);
+
+	mutex_lock(&ir_raw_handler_lock);
+	list_del(&ir->raw->list);
+	list_for_each_entry(handler, &ir_raw_handler_list, list)
+		if (handler->raw_unregister)
+			handler->raw_unregister(ir->raw->input_dev);
+	mutex_unlock(&ir_raw_handler_lock);
+
+	kfifo_free(&ir->raw->kfifo);
+	kfree(ir->raw);
+	ir->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->input_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->input_dev);
+	available_protocols &= ~ir_raw_handler->protocols;
+	mutex_unlock(&ir_raw_handler_lock);
+}
+EXPORT_SYMBOL(ir_raw_handler_unregister);
+
+#ifdef MODULE
+static void init_decoders(struct work_struct *work)
+{
+	/* Load the decoder modules */
+
+	load_nec_decode();
+	load_rc5_decode();
+	load_rc6_decode();
+	load_jvc_decode();
+	load_sony_decode();
+	load_lirc_codec();
+
+	/* If needed, we may later add some init code. In this case,
+	   it is needed to change the CONFIG_MODULE test at ir-core.h
+	 */
+}
+#endif
+
+void ir_raw_init(void)
+{
+#ifdef MODULE
+	INIT_WORK(&wq_load, init_decoders);
+	schedule_work(&wq_load);
+#endif
+}