cregit-Linux how code gets into the kernel

Release 4.14 include/media/rc-core.h

Directory: include/media
/*
 * 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/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)                             \
                printk(KERN_DEBUG pr_fmt(fmt), ##__VA_ARGS__);  \
} while (0)

/**
 * enum rc_driver_type - type of the RC output
 *
 * @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 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
 * @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
 * @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;
	
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;
	
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);

/**
 * rc_open - Opens a RC device
 *
 * @rdev: pointer to struct rc_dev.
 */
int rc_open(struct rc_dev *rdev);

/**
 * rc_close - Closes a RC device
 *
 * @rdev: pointer to struct rc_dev.
 */
void rc_close(struct rc_dev *rdev);

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)); }

Contributors

PersonTokensPropCommitsCommitProp
Maxim Levitsky25100.00%1100.00%
Total25100.00%1100.00%

#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); 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);
static inline void ir_raw_event_reset(struct rc_dev *dev) { struct ir_raw_event ev = { .reset = true }; ir_raw_event_store(dev, &ev); ir_raw_event_handle(dev); }

Contributors

PersonTokensPropCommitsCommitProp
David Härdeman2877.78%250.00%
Heiner Kallweit616.67%125.00%
Maxim Levitsky25.56%125.00%
Total36100.00%4100.00%

/* 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; }

Contributors

PersonTokensPropCommitsCommitProp
David Härdeman61100.00%1100.00%
Total61100.00%1100.00%

/* 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; }

Contributors

PersonTokensPropCommitsCommitProp
Shawn Guo10896.43%150.00%
Sean Young43.57%150.00%
Total112100.00%2100.00%

#endif /* _RC_CORE */

Overall Contributors

PersonTokensPropCommitsCommitProp
David Härdeman31431.21%1422.95%
Mauro Carvalho Chehab17717.59%2134.43%
Maxim Levitsky15615.51%34.92%
Shawn Guo10910.83%11.64%
Jarod Wilson787.75%69.84%
James Hogan666.56%46.56%
Heiner Kallweit383.78%23.28%
Sean Young333.28%58.20%
Srinivas Kandagatla201.99%11.64%
Andi Shyti100.99%23.28%
Eric Nelson40.40%11.64%
Joe Perches10.10%11.64%
Total1006100.00%61100.00%
Directory: include/media
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