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
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
|
/* ir-register.c - handle IR scancode->keycode tables
*
* Copyright (C) 2009 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.
*/
#include <linux/input.h>
#include <linux/device.h>
#include <media/ir-core.h>
#define IRRCV_NUM_DEVICES 256
/* bit array to represent IR sysfs device number */
static unsigned long ir_core_dev_number;
/* class for /sys/class/irrcv */
static struct class *ir_input_class;
/**
* show_protocol() - shows the current IR protocol
* @d: the device descriptor
* @mattr: the device attribute struct (unused)
* @buf: a pointer to the output buffer
*
* This routine is a callback routine for input read the IR protocol type.
* it is trigged by reading /sys/class/irrcv/irrcv?/current_protocol.
* It returns the protocol name, as understood by the driver.
*/
static ssize_t show_protocol(struct device *d,
struct device_attribute *mattr, char *buf)
{
char *s;
struct ir_input_dev *ir_dev = dev_get_drvdata(d);
enum ir_type ir_type = ir_dev->rc_tab.ir_type;
IR_dprintk(1, "Current protocol is %ld\n", ir_type);
/* FIXME: doesn't support multiple protocols at the same time */
if (ir_type == IR_TYPE_UNKNOWN)
s = "Unknown";
else if (ir_type == IR_TYPE_RC5)
s = "RC-5";
else if (ir_type == IR_TYPE_PD)
s = "Pulse/distance";
else if (ir_type == IR_TYPE_NEC)
s = "NEC";
else
s = "Other";
return sprintf(buf, "%s\n", s);
}
/**
* store_protocol() - shows the current IR protocol
* @d: the device descriptor
* @mattr: the device attribute struct (unused)
* @buf: a pointer to the input buffer
* @len: length of the input buffer
*
* This routine is a callback routine for changing the IR protocol type.
* it is trigged by reading /sys/class/irrcv/irrcv?/current_protocol.
* It changes the IR the protocol name, if the IR type is recognized
* by the driver.
* If an unknown protocol name is used, returns -EINVAL.
*/
static ssize_t store_protocol(struct device *d,
struct device_attribute *mattr,
const char *data,
size_t len)
{
struct ir_input_dev *ir_dev = dev_get_drvdata(d);
enum ir_type ir_type = IR_TYPE_UNKNOWN;
int rc = -EINVAL;
unsigned long flags;
char *buf;
buf = strsep((char **) &data, "\n");
if (!strcasecmp(buf, "rc-5"))
ir_type = IR_TYPE_RC5;
else if (!strcasecmp(buf, "pd"))
ir_type = IR_TYPE_PD;
else if (!strcasecmp(buf, "nec"))
ir_type = IR_TYPE_NEC;
if (ir_type == IR_TYPE_UNKNOWN) {
IR_dprintk(1, "Error setting protocol to %ld\n", ir_type);
return -EINVAL;
}
if (ir_dev->props->change_protocol)
rc = ir_dev->props->change_protocol(ir_dev->props->priv,
ir_type);
if (rc < 0) {
IR_dprintk(1, "Error setting protocol to %ld\n", ir_type);
return -EINVAL;
}
spin_lock_irqsave(&ir_dev->rc_tab.lock, flags);
ir_dev->rc_tab.ir_type = ir_type;
spin_unlock_irqrestore(&ir_dev->rc_tab.lock, flags);
IR_dprintk(1, "Current protocol is %ld\n", ir_type);
return len;
}
/*
* Static device attribute struct with the sysfs attributes for IR's
*/
static DEVICE_ATTR(current_protocol, S_IRUGO | S_IWUSR,
show_protocol, store_protocol);
static struct attribute *ir_dev_attrs[] = {
&dev_attr_current_protocol.attr,
};
/**
* ir_register_class() - creates the sysfs for /sys/class/irrcv/irrcv?
* @input_dev: the struct input_dev descriptor of the device
*
* This routine is used to register the syfs code for IR class
*/
int ir_register_class(struct input_dev *input_dev)
{
int rc;
struct kobject *kobj;
struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
int devno = find_first_zero_bit(&ir_core_dev_number,
IRRCV_NUM_DEVICES);
if (unlikely(devno < 0))
return devno;
ir_dev->attr.attrs = ir_dev_attrs;
ir_dev->class_dev = device_create(ir_input_class, NULL,
input_dev->dev.devt, ir_dev,
"irrcv%d", devno);
kobj = &ir_dev->class_dev->kobj;
printk(KERN_WARNING "Creating IR device %s\n", kobject_name(kobj));
rc = sysfs_create_group(kobj, &ir_dev->attr);
if (unlikely(rc < 0)) {
device_destroy(ir_input_class, input_dev->dev.devt);
return -ENOMEM;
}
ir_dev->devno = devno;
set_bit(devno, &ir_core_dev_number);
return 0;
};
/**
* ir_unregister_class() - removes the sysfs for sysfs for
* /sys/class/irrcv/irrcv?
* @input_dev: the struct input_dev descriptor of the device
*
* This routine is used to unregister the syfs code for IR class
*/
void ir_unregister_class(struct input_dev *input_dev)
{
struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
struct kobject *kobj;
clear_bit(ir_dev->devno, &ir_core_dev_number);
kobj = &ir_dev->class_dev->kobj;
sysfs_remove_group(kobj, &ir_dev->attr);
device_destroy(ir_input_class, input_dev->dev.devt);
kfree(ir_dev->attr.name);
}
/*
* Init/exit code for the module. Basically, creates/removes /sys/class/irrcv
*/
static int __init ir_core_init(void)
{
ir_input_class = class_create(THIS_MODULE, "irrcv");
if (IS_ERR(ir_input_class)) {
printk(KERN_ERR "ir_core: unable to register irrcv class\n");
return PTR_ERR(ir_input_class);
}
return 0;
}
static void __exit ir_core_exit(void)
{
class_destroy(ir_input_class);
}
module_init(ir_core_init);
module_exit(ir_core_exit);
|
