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linux/include/media/rc-core.h
Mauro Carvalho Chehab 078600f514 [media] rc-core: allow calling rc_open with device not initialized 
The device initialization completes only after calling
input_register_device(). However, rc_open() can be called while
the device is being registered by the input/evdev core. So, we
can't expect that rc_dev->initialized to be true.

Change the logic to don't require initialized == true at rc_open
and change the type of initialized to be atomic.

this way, we can check for it earlier where it is really needed,
without needing to lock the mutex just for testing it.

Tested with nuvoton_cir driver on a NUC5i7RYB with CIR integrated on it.

Reported-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
2016-03-03 06:16:14 -03:00

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/*
* 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 {
RC_DRIVER_SCANCODE = 0, /* Driver or hardware generates a scancode */
RC_DRIVER_IR_RAW, /* Needs a Infra-Red pulse/space decoder */
};
/**
* 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
* @initialized: 1 if the device init has completed, 0 otherwise
* @sysfs_groups: sysfs attribute groups
* @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
* @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
* @allowed_protocols: bitmask with the supported RC_BIT_* protocols
* @enabled_protocols: bitmask with the enabled RC_BIT_* protocols
* @allowed_wakeup_protocols: bitmask with the supported RC_BIT_* wakeup protocols
* @enabled_wakeup_protocols: bitmask with the enabled RC_BIT_* wakeup protocols
* @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
* @change_wakeup_protocol: allow changing the protocol used for wakeup
* filtering
* @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
*/
struct rc_dev {
struct device dev;
atomic_t initialized;
const struct attribute_group *sysfs_groups[5];
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 int minor;
struct ir_raw_event_ctrl *raw;
struct input_dev *input_dev;
enum rc_driver_type driver_type;
bool idle;
u64 allowed_protocols;
u64 enabled_protocols;
u64 allowed_wakeup_protocols;
u64 enabled_wakeup_protocols;
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_type 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_type);
int (*change_wakeup_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);
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);
};
#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);
int rc_open(struct rc_dev *rdev);
void rc_close(struct rc_dev *rdev);
void rc_repeat(struct rc_dev *dev);
void rc_keydown(struct rc_dev *dev, enum rc_type protocol, u32 scancode, u8 toggle);
void rc_keydown_notimeout(struct rc_dev *dev, enum rc_type 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.
*/
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_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, 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)
{
DEFINE_IR_RAW_EVENT(ev);
ev.reset = true;
ir_raw_event_store(dev, &ev);
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;
}
#endif /* _RC_CORE */
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