blob: b0c494a6907904b9ceb38dac8be868f06b276d5a [file] [log] [blame]
* Remote Controller core header
* Copyright (C) 2009-2010 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
* GNU General Public License for more details.
#ifndef _RC_CORE
#define _RC_CORE
#include <linux/spinlock.h>
#include <linux/kfifo.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <media/rc-map.h>
extern int rc_core_debug;
#define IR_dprintk(level, fmt, ...) \
do { \
if (rc_core_debug >= level) \
pr_debug("%s: " fmt, __func__, ##__VA_ARGS__); \
} while (0)
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 */
* struct rc_dev - represents a remote control device
* @dev: driver model's view of this device
* @input_name: name of the input child device
* @input_phys: physical path to the input child device
* @input_id: id of the input child device (struct input_id)
* @driver_name: name of the hardware driver which registered this device
* @map_name: name of the default keymap
* @rc_map: current scan/key table
* @lock: used to ensure we've filled in all protocol details before
* anyone can call show_protocols or store_protocols
* @devno: unique remote control device number
* @raw: additional data for raw pulse/space devices
* @input_dev: the input child device used to communicate events to userspace
* @driver_type: specifies if protocol decoding is done in hardware or software
* @idle: used to keep track of RX state
* @allowed_protos: bitmask with the supported RC_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
* @keylock: protects the remaining members of the struct
* @keypressed: whether a key is currently pressed
* @keyup_jiffies: time (in jiffies) when the current keypress should be released
* @timer_keyup: timer for releasing a keypress
* @last_keycode: keycode of last keypress
* @last_scancode: scancode of last keypress
* @last_toggle: toggle value of last command
* @timeout: optional time after which device stops sending data
* @min_timeout: minimum timeout supported by device
* @max_timeout: maximum timeout supported by device
* @rx_resolution : resolution (in ns) of input sampler
* @tx_resolution: resolution (in ns) of output sampler
* @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.
* @s_tx_mask: set transmitter mask (for devices with multiple tx outputs)
* @s_tx_carrier: set transmit carrier frequency
* @s_tx_duty_cycle: set transmit duty cycle (0% - 100%)
* @s_rx_carrier: inform driver about carrier it is expected to handle
* @tx_ir: transmit IR
* @s_idle: enable/disable hardware idle mode, upon which,
* device doesn't interrupt host until it sees IR pulses
* @s_learning_mode: enable wide band receiver used for learning
* @s_carrier_report: enable carrier reports
struct rc_dev {
struct device dev;
const char *input_name;
const char *input_phys;
struct input_id input_id;
char *driver_name;
const char *map_name;
struct rc_map rc_map;
struct mutex lock;
unsigned long devno;
struct ir_raw_event_ctrl *raw;
struct input_dev *input_dev;
enum rc_driver_type driver_type;
bool idle;
u64 allowed_protos;
u32 scanmask;
void *priv;
spinlock_t keylock;
bool keypressed;
unsigned long keyup_jiffies;
struct timer_list timer_keyup;
u32 last_keycode;
u32 last_scancode;
u8 last_toggle;
u32 timeout;
u32 min_timeout;
u32 max_timeout;
u32 rx_resolution;
u32 tx_resolution;
int (*change_protocol)(struct rc_dev *dev, u64 rc_type);
int (*open)(struct rc_dev *dev);
void (*close)(struct rc_dev *dev);
int (*s_tx_mask)(struct rc_dev *dev, u32 mask);
int (*s_tx_carrier)(struct rc_dev *dev, u32 carrier);
int (*s_tx_duty_cycle)(struct rc_dev *dev, u32 duty_cycle);
int (*s_rx_carrier_range)(struct rc_dev *dev, u32 min, u32 max);
int (*tx_ir)(struct rc_dev *dev, unsigned *txbuf, unsigned n);
void (*s_idle)(struct rc_dev *dev, bool enable);
int (*s_learning_mode)(struct rc_dev *dev, int enable);
int (*s_carrier_report) (struct rc_dev *dev, int enable);
#define to_rc_dev(d) container_of(d, struct rc_dev, dev)
* From rc-main.c
* Those functions can be used on any type of Remote Controller. They
* basically creates an input_dev and properly reports the device as a
* Remote Controller, at sys/class/rc.
struct rc_dev *rc_allocate_device(void);
void rc_free_device(struct rc_dev *dev);
int rc_register_device(struct rc_dev *dev);
void rc_unregister_device(struct rc_dev *dev);
void rc_repeat(struct rc_dev *dev);
void rc_keydown(struct rc_dev *dev, int scancode, u8 toggle);
void rc_keydown_notimeout(struct rc_dev *dev, int scancode, u8 toggle);
void rc_keyup(struct rc_dev *dev);
u32 rc_g_keycode_from_table(struct rc_dev *dev, u32 scancode);
* From rc-raw.c
* The Raw interface is specific to InfraRed. It may be a good idea to
* split it later into a separate header.
enum raw_event_type {
IR_SPACE = (1 << 0),
IR_PULSE = (1 << 1),
IR_START_EVENT = (1 << 2),
IR_STOP_EVENT = (1 << 3),
struct ir_raw_event {
union {
u32 duration;
struct {
u32 carrier;
u8 duty_cycle;
unsigned pulse:1;
unsigned reset:1;
unsigned timeout:1;
unsigned carrier_report:1;
#define DEFINE_IR_RAW_EVENT(event) \
struct ir_raw_event event = { \
{ .duration = 0 } , \
.pulse = 0, \
.reset = 0, \
.timeout = 0, \
.carrier_report = 0 }
static inline void init_ir_raw_event(struct ir_raw_event *ev)
memset(ev, 0, sizeof(*ev));
#define IR_MAX_DURATION 0xFFFFFFFF /* a bit more than 4 seconds */
#define US_TO_NS(usec) ((usec) * 1000)
#define MS_TO_US(msec) ((msec) * 1000)
#define MS_TO_NS(msec) ((msec) * 1000 * 1000)
void ir_raw_event_handle(struct rc_dev *dev);
int ir_raw_event_store(struct rc_dev *dev, struct ir_raw_event *ev);
int ir_raw_event_store_edge(struct rc_dev *dev, enum raw_event_type type);
int ir_raw_event_store_with_filter(struct rc_dev *dev,
struct ir_raw_event *ev);
void ir_raw_event_set_idle(struct rc_dev *dev, bool idle);
static inline void ir_raw_event_reset(struct rc_dev *dev)
ev.reset = true;
ir_raw_event_store(dev, &ev);
/* extract mask bits out of data and pack them into the result */
static inline u32 ir_extract_bits(u32 data, u32 mask)
u32 vbit = 1, value = 0;
do {
if (mask & 1) {
if (data & 1)
value |= vbit;
vbit <<= 1;
data >>= 1;
} while (mask >>= 1);
return value;
#endif /* _RC_CORE */