linux/include/media/rc-core.h
Sean Young e0d51e6cef media: rc: default to idle on at startup or after reset
Any spaces events received after a reset or startup should be discarded,
so ensure the rc device is in idle mode.

This also makes it much easier to detect incorrect raw events, as we will
do in a following commit.

Signed-off-by: Sean Young <sean@mess.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
2018-05-14 07:14:51 -04:00

403 lines
13 KiB
C

/*
* 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
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#ifndef _RC_CORE
#define _RC_CORE
#include <linux/spinlock.h>
#include <linux/cdev.h>
#include <linux/kfifo.h>
#include <linux/time.h>
#include <linux/timer.h>
#include <media/rc-map.h>
/**
* enum rc_driver_type - type of the RC driver.
*
* @RC_DRIVER_SCANCODE: Driver or hardware generates a scancode.
* @RC_DRIVER_IR_RAW: Driver or hardware generates pulse/space sequences.
* It needs a Infra-Red pulse/space decoder
* @RC_DRIVER_IR_RAW_TX: Device transmitter only,
* driver requires pulse/space data sequence.
*/
enum rc_driver_type {
RC_DRIVER_SCANCODE = 0,
RC_DRIVER_IR_RAW,
RC_DRIVER_IR_RAW_TX,
};
/**
* struct rc_scancode_filter - Filter scan codes.
* @data: Scancode data to match.
* @mask: Mask of bits of scancode to compare.
*/
struct rc_scancode_filter {
u32 data;
u32 mask;
};
/**
* enum rc_filter_type - Filter type constants.
* @RC_FILTER_NORMAL: Filter for normal operation.
* @RC_FILTER_WAKEUP: Filter for waking from suspend.
* @RC_FILTER_MAX: Number of filter types.
*/
enum rc_filter_type {
RC_FILTER_NORMAL = 0,
RC_FILTER_WAKEUP,
RC_FILTER_MAX
};
/**
* struct lirc_fh - represents an open lirc file
* @list: list of open file handles
* @rc: rcdev for this lirc chardev
* @carrier_low: when setting the carrier range, first the low end must be
* set with an ioctl and then the high end with another ioctl
* @send_timeout_reports: report timeouts in lirc raw IR.
* @rawir: queue for incoming raw IR
* @scancodes: queue for incoming decoded scancodes
* @wait_poll: poll struct for lirc device
* @send_mode: lirc mode for sending, either LIRC_MODE_SCANCODE or
* LIRC_MODE_PULSE
* @rec_mode: lirc mode for receiving, either LIRC_MODE_SCANCODE or
* LIRC_MODE_MODE2
*/
struct lirc_fh {
struct list_head list;
struct rc_dev *rc;
int carrier_low;
bool send_timeout_reports;
DECLARE_KFIFO_PTR(rawir, unsigned int);
DECLARE_KFIFO_PTR(scancodes, struct lirc_scancode);
wait_queue_head_t wait_poll;
u8 send_mode;
u8 rec_mode;
};
/**
* struct rc_dev - represents a remote control device
* @dev: driver model's view of this device
* @managed_alloc: devm_rc_allocate_device was used to create rc_dev
* @sysfs_groups: sysfs attribute groups
* @device_name: name of the rc 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
* @minor: unique minor 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
* @encode_wakeup: wakeup filtering uses IR encode API, therefore the allowed
* wakeup protocols is the set of all raw encoders
* @allowed_protocols: bitmask with the supported RC_PROTO_BIT_* protocols
* @enabled_protocols: bitmask with the enabled RC_PROTO_BIT_* protocols
* @allowed_wakeup_protocols: bitmask with the supported RC_PROTO_BIT_* wakeup
* protocols
* @wakeup_protocol: the enabled RC_PROTO_* wakeup protocol or
* RC_PROTO_UNKNOWN if disabled.
* @scancode_filter: scancode filter
* @scancode_wakeup_filter: scancode wakeup filters
* @scancode_mask: 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
* @users: number of current users of the device
* @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
* @timer_repeat: timer for autorepeat events. This is needed for CEC, which
* has non-standard repeats.
* @last_keycode: keycode of last keypress
* @last_protocol: protocol 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
* @lirc_dev: lirc device
* @lirc_cdev: lirc char cdev
* @gap_start: time when gap starts
* @gap_duration: duration of initial gap
* @gap: true if we're in a gap
* @lirc_fh_lock: protects lirc_fh list
* @lirc_fh: list of open files
* @registered: set to true by rc_register_device(), false by
* rc_unregister_device
* @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_range: 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
* @s_filter: set the scancode filter
* @s_wakeup_filter: set the wakeup scancode filter. If the mask is zero
* then wakeup should be disabled. wakeup_protocol will be set to
* a valid protocol if mask is nonzero.
* @s_timeout: set hardware timeout in ns
*/
struct rc_dev {
struct device dev;
bool managed_alloc;
const struct attribute_group *sysfs_groups[5];
const char *device_name;
const char *input_phys;
struct input_id input_id;
const char *driver_name;
const char *map_name;
struct rc_map rc_map;
struct mutex lock;
unsigned int minor;
struct ir_raw_event_ctrl *raw;
struct input_dev *input_dev;
enum rc_driver_type driver_type;
bool idle;
bool encode_wakeup;
u64 allowed_protocols;
u64 enabled_protocols;
u64 allowed_wakeup_protocols;
enum rc_proto wakeup_protocol;
struct rc_scancode_filter scancode_filter;
struct rc_scancode_filter scancode_wakeup_filter;
u32 scancode_mask;
u32 users;
void *priv;
spinlock_t keylock;
bool keypressed;
unsigned long keyup_jiffies;
struct timer_list timer_keyup;
struct timer_list timer_repeat;
u32 last_keycode;
enum rc_proto last_protocol;
u32 last_scancode;
u8 last_toggle;
u32 timeout;
u32 min_timeout;
u32 max_timeout;
u32 rx_resolution;
u32 tx_resolution;
#ifdef CONFIG_LIRC
struct device lirc_dev;
struct cdev lirc_cdev;
ktime_t gap_start;
u64 gap_duration;
bool gap;
spinlock_t lirc_fh_lock;
struct list_head lirc_fh;
#endif
bool registered;
int (*change_protocol)(struct rc_dev *dev, u64 *rc_proto);
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);
int (*s_filter)(struct rc_dev *dev,
struct rc_scancode_filter *filter);
int (*s_wakeup_filter)(struct rc_dev *dev,
struct rc_scancode_filter *filter);
int (*s_timeout)(struct rc_dev *dev,
unsigned int timeout);
};
#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.
*/
/**
* rc_allocate_device - Allocates a RC device
*
* @rc_driver_type: specifies the type of the RC output to be allocated
* returns a pointer to struct rc_dev.
*/
struct rc_dev *rc_allocate_device(enum rc_driver_type);
/**
* devm_rc_allocate_device - Managed RC device allocation
*
* @dev: pointer to struct device
* @rc_driver_type: specifies the type of the RC output to be allocated
* returns a pointer to struct rc_dev.
*/
struct rc_dev *devm_rc_allocate_device(struct device *dev, enum rc_driver_type);
/**
* rc_free_device - Frees a RC device
*
* @dev: pointer to struct rc_dev.
*/
void rc_free_device(struct rc_dev *dev);
/**
* rc_register_device - Registers a RC device
*
* @dev: pointer to struct rc_dev.
*/
int rc_register_device(struct rc_dev *dev);
/**
* devm_rc_register_device - Manageded registering of a RC device
*
* @parent: pointer to struct device.
* @dev: pointer to struct rc_dev.
*/
int devm_rc_register_device(struct device *parent, struct rc_dev *dev);
/**
* rc_unregister_device - Unregisters a RC device
*
* @dev: pointer to struct rc_dev.
*/
void rc_unregister_device(struct rc_dev *dev);
void rc_repeat(struct rc_dev *dev);
void rc_keydown(struct rc_dev *dev, enum rc_proto protocol, u32 scancode,
u8 toggle);
void rc_keydown_notimeout(struct rc_dev *dev, enum rc_proto protocol,
u32 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.
*/
struct ir_raw_event {
union {
u32 duration;
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 = {}
static inline void init_ir_raw_event(struct ir_raw_event *ev)
{
memset(ev, 0, sizeof(*ev));
}
#define IR_DEFAULT_TIMEOUT MS_TO_NS(125)
#define IR_MAX_DURATION 500000000 /* 500 ms */
#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, bool pulse);
int ir_raw_event_store_with_filter(struct rc_dev *dev,
struct ir_raw_event *ev);
int ir_raw_event_store_with_timeout(struct rc_dev *dev,
struct ir_raw_event *ev);
void ir_raw_event_set_idle(struct rc_dev *dev, bool idle);
int ir_raw_encode_scancode(enum rc_proto protocol, u32 scancode,
struct ir_raw_event *events, unsigned int max);
int ir_raw_encode_carrier(enum rc_proto protocol);
static inline void ir_raw_event_reset(struct rc_dev *dev)
{
struct ir_raw_event ev = { .reset = true };
ir_raw_event_store(dev, &ev);
dev->idle = true;
ir_raw_event_handle(dev);
}
/* 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;
}
/* Get NEC scancode and protocol type from address and command bytes */
static inline u32 ir_nec_bytes_to_scancode(u8 address, u8 not_address,
u8 command, u8 not_command,
enum rc_proto *protocol)
{
u32 scancode;
if ((command ^ not_command) != 0xff) {
/* NEC transport, but modified protocol, used by at
* least Apple and TiVo remotes
*/
scancode = not_address << 24 |
address << 16 |
not_command << 8 |
command;
*protocol = RC_PROTO_NEC32;
} else if ((address ^ not_address) != 0xff) {
/* Extended NEC */
scancode = address << 16 |
not_address << 8 |
command;
*protocol = RC_PROTO_NECX;
} else {
/* Normal NEC */
scancode = address << 8 | command;
*protocol = RC_PROTO_NEC;
}
return scancode;
}
#endif /* _RC_CORE */