aboutsummaryrefslogtreecommitdiffstats
path: root/include/media/ir-core.h
blob: eb7fddf8f6075f22ab21fff06007a6cf84df5220 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
/*
 * 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 */
};

/**
 * 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
 * @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
 * @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.
 * @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: optional: 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
 */
struct ir_dev_props {
	enum rc_driver_type	driver_type;
	unsigned long		allowed_protos;
	u32			scanmask;

	u32			timeout;
	u32			min_timeout;
	u32			max_timeout;

	u32			rx_resolution;
	u32			tx_resolution;

	void			*priv;
	int			(*change_protocol)(void *priv, u64 ir_type);
	int			(*open)(void *priv);
	void			(*close)(void *priv);
	int			(*s_tx_mask)(void *priv, u32 mask);
	int			(*s_tx_carrier)(void *priv, u32 carrier);
	int			(*s_tx_duty_cycle)(void *priv, u32 duty_cycle);
	int			(*s_rx_carrier_range)(void *priv, u32 min, u32 max);
	int			(*tx_ir)(void *priv, int *txbuf, u32 n);
	void			(*s_idle)(void *priv, int enable);
	int			(*s_learning_mode)(void *priv, int enable);
};

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 */
	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 */
	bool				idle;

	/* 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 */
};

enum raw_event_type {
	IR_SPACE        = (1 << 0),
	IR_PULSE        = (1 << 1),
	IR_START_EVENT  = (1 << 2),
	IR_STOP_EVENT   = (1 << 3),
};

#define to_ir_input_dev(_attr) container_of(_attr, struct ir_input_dev, attr)

/* From ir-keytable.c */
int __ir_input_register(struct input_dev *dev,
		      const struct ir_scancode_table *ir_codes,
		      struct ir_dev_props *props,
		      const char *driver_name);

static inline int ir_input_register(struct input_dev *dev,
		      const char *map_name,
		      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) {
		ir_codes = get_rc_map(RC_MAP_EMPTY);

		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);

void ir_repeat(struct input_dev *dev);
void ir_keydown(struct input_dev *dev, int scancode, u8 toggle);
u32 ir_g_keycode_from_table(struct input_dev *input_dev, u32 scancode);

/* From ir-raw-event.c */

struct ir_raw_event {
	unsigned                        pulse:1;
	unsigned                        duration:31;
};

#define IR_MAX_DURATION                 0x7FFFFFFF      /* a bit more than 2 seconds */

void ir_raw_event_handle(struct input_dev *input_dev);
int ir_raw_event_store(struct input_dev *input_dev, struct ir_raw_event *ev);
int ir_raw_event_store_edge(struct input_dev *input_dev, enum raw_event_type type);
int ir_raw_event_store_with_filter(struct input_dev *input_dev,
				struct ir_raw_event *ev);
void ir_raw_event_set_idle(struct input_dev *input_dev, int idle);

static inline void ir_raw_event_reset(struct input_dev *input_dev)
{
	struct ir_raw_event ev = { .pulse = false, .duration = 0 };
	ir_raw_event_store(input_dev, &ev);
	ir_raw_event_handle(input_dev);
}

#endif /* _IR_CORE */