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/* 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 <media/ir-core.h>
#include <linux/workqueue.h>
#include <linux/spinlock.h>
/* Define the max number of bit transitions per IR keycode */
#define MAX_IR_EVENT_SIZE 256
/* Used to handle IR raw handler extensions */
static LIST_HEAD(ir_raw_handler_list);
static spinlock_t ir_raw_handler_lock;
/**
* RUN_DECODER() - runs an operation on all IR decoders
* @ops: IR raw handler operation to be called
* @arg: arguments to be passed to the callback
*
* Calls ir_raw_handler::ops for all registered IR handlers. It prevents
* new decode addition/removal while running, by locking ir_raw_handler_lock
* mutex. If an error occurs, it stops the ops. Otherwise, it returns a sum
* of the return codes.
*/
#define RUN_DECODER(ops, ...) ({ \
struct ir_raw_handler *_ir_raw_handler; \
int _sumrc = 0, _rc; \
spin_lock(&ir_raw_handler_lock); \
list_for_each_entry(_ir_raw_handler, &ir_raw_handler_list, list) { \
if (_ir_raw_handler->ops) { \
_rc = _ir_raw_handler->ops(__VA_ARGS__); \
if (_rc < 0) \
break; \
_sumrc += _rc; \
} \
} \
spin_unlock(&ir_raw_handler_lock); \
_sumrc; \
})
/* Used to load the decoders */
static struct work_struct wq_load;
int ir_raw_event_register(struct input_dev *input_dev)
{
struct ir_input_dev *ir = input_get_drvdata(input_dev);
int rc, size;
ir->raw = kzalloc(sizeof(*ir->raw), GFP_KERNEL);
if (!ir->raw)
return -ENOMEM;
size = sizeof(struct ir_raw_event) * MAX_IR_EVENT_SIZE * 2;
size = roundup_pow_of_two(size);
rc = kfifo_alloc(&ir->raw->kfifo, size, GFP_KERNEL);
if (rc < 0) {
kfree(ir->raw);
ir->raw = NULL;
return rc;
}
rc = RUN_DECODER(raw_register, input_dev);
if (rc < 0) {
kfifo_free(&ir->raw->kfifo);
kfree(ir->raw);
ir->raw = NULL;
return rc;
}
return rc;
}
EXPORT_SYMBOL_GPL(ir_raw_event_register);
void ir_raw_event_unregister(struct input_dev *input_dev)
{
struct ir_input_dev *ir = input_get_drvdata(input_dev);
if (!ir->raw)
return;
RUN_DECODER(raw_unregister, input_dev);
kfifo_free(&ir->raw->kfifo);
kfree(ir->raw);
ir->raw = NULL;
}
EXPORT_SYMBOL_GPL(ir_raw_event_unregister);
int ir_raw_event_store(struct input_dev *input_dev, enum raw_event_type type)
{
struct ir_input_dev *ir = input_get_drvdata(input_dev);
struct timespec ts;
struct ir_raw_event event;
int rc;
if (!ir->raw)
return -EINVAL;
event.type = type;
event.delta.tv_sec = 0;
event.delta.tv_nsec = 0;
ktime_get_ts(&ts);
if (timespec_equal(&ir->raw->last_event, &event.delta))
event.type |= IR_START_EVENT;
else
event.delta = timespec_sub(ts, ir->raw->last_event);
memcpy(&ir->raw->last_event, &ts, sizeof(ts));
if (event.delta.tv_sec) {
event.type |= IR_START_EVENT;
event.delta.tv_sec = 0;
event.delta.tv_nsec = 0;
}
kfifo_in(&ir->raw->kfifo, &event, sizeof(event));
return rc;
}
EXPORT_SYMBOL_GPL(ir_raw_event_store);
int ir_raw_event_handle(struct input_dev *input_dev)
{
struct ir_input_dev *ir = input_get_drvdata(input_dev);
int rc;
struct ir_raw_event *evs;
int len, i;
/*
* Store the events into a temporary buffer. This allows calling more than
* one decoder to deal with the received data
*/
len = kfifo_len(&ir->raw->kfifo) / sizeof(*evs);
if (!len)
return 0;
evs = kmalloc(len * sizeof(*evs), GFP_ATOMIC);
for (i = 0; i < len; i++) {
rc = kfifo_out(&ir->raw->kfifo, &evs[i], sizeof(*evs));
if (rc != sizeof(*evs)) {
IR_dprintk(1, "overflow error: received %d instead of %zd\n",
rc, sizeof(*evs));
return -EINVAL;
}
IR_dprintk(2, "event type %d, time before event: %07luus\n",
evs[i].type, (evs[i].delta.tv_nsec + 500) / 1000);
}
/*
* Call all ir decoders. This allows decoding the same event with
* more than one protocol handler. It returns the number of keystrokes
* sent to the event interface
*/
rc = RUN_DECODER(decode, input_dev, evs, len);
kfree(evs);
return rc;
}
EXPORT_SYMBOL_GPL(ir_raw_event_handle);
/*
* Extension interface - used to register the IR decoders
*/
int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler)
{
spin_lock(&ir_raw_handler_lock);
list_add_tail(&ir_raw_handler->list, &ir_raw_handler_list);
spin_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)
{
spin_lock(&ir_raw_handler_lock);
list_del(&ir_raw_handler->list);
spin_unlock(&ir_raw_handler_lock);
}
EXPORT_SYMBOL(ir_raw_handler_unregister);
static void init_decoders(struct work_struct *work)
{
/* Load the decoder modules */
load_nec_decode();
/* 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
*/
}
void ir_raw_init(void)
{
spin_lock_init(&ir_raw_handler_lock);
#ifdef MODULE
INIT_WORK(&wq_load, init_decoders);
schedule_work(&wq_load);
#endif
}
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