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/*
* Remote Controller core header
*
* Copyright (C) 2009-2010 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.
*/
#ifndef _IR_CORE
#define _IR_CORE
#include <linux/spinlock.h>
#include <linux/kfifo.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <media/rc-map.h>
extern int ir_core_debug;
#define IR_dprintk(level, fmt, arg...) if (ir_core_debug >= level) \
printk(KERN_DEBUG "%s: " fmt , __func__, ## arg)
enum rc_driver_type {
RC_DRIVER_SCANCODE = 0, /* Driver or hardware generates a scancode */
RC_DRIVER_IR_RAW, /* Needs a Infra-Red pulse/space decoder */
};
enum raw_event_type {
IR_SPACE = (1 << 0),
IR_PULSE = (1 << 1),
IR_START_EVENT = (1 << 2),
IR_STOP_EVENT = (1 << 3),
};
/**
* struct ir_dev_props - Allow caller drivers to set special properties
* @driver_type: specifies if the driver or hardware have already a decoder,
* or if it needs to use the IR raw event decoders to produce a scancode
* @allowed_protos: bitmask with the supported IR_TYPE_* protocols
* @scanmask: some hardware decoders are not capable of providing the full
* scancode to the application. As this is a hardware limit, we can't do
* anything with it. Yet, as the same keycode table can be used with other
* devices, a mask is provided to allow its usage. Drivers should generally
* leave this field in blank
* @priv: driver-specific data, to be used on the callbacks
* @change_protocol: allow changing the protocol used on hardware decoders
* @open: callback to allow drivers to enable polling/irq when IR input device
* is opened.
* @close: callback to allow drivers to disable polling/irq when IR input device
* is opened.
*/
struct ir_dev_props {
enum rc_driver_type driver_type;
unsigned long allowed_protos;
u32 scanmask;
void *priv;
int (*change_protocol)(void *priv, u64 ir_type);
int (*open)(void *priv);
void (*close)(void *priv);
};
struct ir_raw_event_ctrl {
struct work_struct rx_work; /* for the rx decoding workqueue */
struct kfifo kfifo; /* fifo for the pulse/space durations */
ktime_t last_event; /* when last event occurred */
enum raw_event_type last_type; /* last event type */
struct input_dev *input_dev; /* pointer to the parent input_dev */
};
struct ir_input_dev {
struct device dev; /* device */
char *driver_name; /* Name of the driver module */
struct ir_scancode_table rc_tab; /* scan/key table */
unsigned long devno; /* device number */
const struct ir_dev_props *props; /* Device properties */
struct ir_raw_event_ctrl *raw; /* for raw pulse/space events */
struct input_dev *input_dev; /* the input device associated with this device */
/* key info - needed by IR keycode handlers */
spinlock_t keylock; /* protects the below members */
bool keypressed; /* current state */
unsigned long keyup_jiffies; /* when should the current keypress be released? */
struct timer_list timer_keyup; /* timer for releasing a keypress */
u32 last_keycode; /* keycode of last command */
u32 last_scancode; /* scancode of last command */
u8 last_toggle; /* toggle of last command */
};
struct ir_raw_handler {
struct list_head list;
int (*decode)(struct input_dev *input_dev, s64 duration);
int (*raw_register)(struct input_dev *input_dev);
int (*raw_unregister)(struct input_dev *input_dev);
};
#define to_ir_input_dev(_attr) container_of(_attr, struct ir_input_dev, attr)
/* Routines from ir-keytable.c */
u32 ir_g_keycode_from_table(struct input_dev *input_dev,
u32 scancode);
void ir_repeat(struct input_dev *dev);
void ir_keydown(struct input_dev *dev, int scancode, u8 toggle);
int __ir_input_register(struct input_dev *dev,
const struct ir_scancode_table *ir_codes,
const struct ir_dev_props *props,
const char *driver_name);
static inline int ir_input_register(struct input_dev *dev,
const char *map_name,
const struct ir_dev_props *props,
const char *driver_name) {
struct ir_scancode_table *ir_codes;
struct ir_input_dev *ir_dev;
int rc;
if (!map_name)
return -EINVAL;
ir_codes = get_rc_map(map_name);
if (!ir_codes)
return -EINVAL;
rc = __ir_input_register(dev, ir_codes, props, driver_name);
if (rc < 0)
return -EINVAL;
ir_dev = input_get_drvdata(dev);
if (!rc && ir_dev->props && ir_dev->props->change_protocol)
rc = ir_dev->props->change_protocol(ir_dev->props->priv,
ir_codes->ir_type);
return rc;
}
void ir_input_unregister(struct input_dev *input_dev);
/* Routines from ir-sysfs.c */
int ir_register_class(struct input_dev *input_dev);
void ir_unregister_class(struct input_dev *input_dev);
/* Routines from ir-raw-event.c */
int ir_raw_event_register(struct input_dev *input_dev);
void ir_raw_event_unregister(struct input_dev *input_dev);
void ir_raw_event_handle(struct input_dev *input_dev);
int ir_raw_event_store(struct input_dev *input_dev, s64 duration);
int ir_raw_event_store_edge(struct input_dev *input_dev, enum raw_event_type type);
static inline void ir_raw_event_reset(struct input_dev *input_dev)
{
ir_raw_event_store(input_dev, 0);
ir_raw_event_handle(input_dev);
}
int ir_raw_handler_register(struct ir_raw_handler *ir_raw_handler);
void ir_raw_handler_unregister(struct ir_raw_handler *ir_raw_handler);
void ir_raw_init(void);
/* from ir-nec-decoder.c */
#ifdef CONFIG_IR_NEC_DECODER_MODULE
#define load_nec_decode() request_module("ir-nec-decoder")
#else
#define load_nec_decode() 0
#endif
/* from ir-rc5-decoder.c */
#ifdef CONFIG_IR_RC5_DECODER_MODULE
#define load_rc5_decode() request_module("ir-rc5-decoder")
#else
#define load_rc5_decode() 0
#endif
/* macros for ir decoders */
#define PULSE(units) ((units))
#define SPACE(units) (-(units))
#define IS_RESET(duration) ((duration) == 0)
#define IS_PULSE(duration) ((duration) > 0)
#define IS_SPACE(duration) ((duration) < 0)
#define DURATION(duration) (abs((duration)))
#define IS_TRANSITION(x, y) ((x) * (y) < 0)
#define DECREASE_DURATION(duration, amount) \
do { \
if (IS_SPACE(duration)) \
duration += (amount); \
else if (IS_PULSE(duration)) \
duration -= (amount); \
} while (0)
#define TO_UNITS(duration, unit_len) \
((int)((duration) > 0 ? \
DIV_ROUND_CLOSEST(abs((duration)), (unit_len)) :\
-DIV_ROUND_CLOSEST(abs((duration)), (unit_len))))
#define TO_US(duration) ((int)TO_UNITS(duration, 1000))
#endif /* _IR_CORE */
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