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4714eda8 MCC |
1 | /* ir-register.c - handle IR scancode->keycode tables |
2 | * | |
3 | * Copyright (C) 2009 by Mauro Carvalho Chehab <mchehab@redhat.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify | |
6 | * it under the terms of the GNU General Public License as published by | |
7 | * the Free Software Foundation version 2 of the License. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | */ | |
14 | ||
15 | #include <linux/input.h> | |
16 | #include <linux/device.h> | |
17 | #include <media/ir-core.h> | |
18 | ||
19 | #define IRRCV_NUM_DEVICES 256 | |
20 | ||
d4b778d3 MCC |
21 | /* bit array to represent IR sysfs device number */ |
22 | static unsigned long ir_core_dev_number; | |
4714eda8 | 23 | |
d4b778d3 | 24 | /* class for /sys/class/irrcv */ |
4714eda8 MCC |
25 | static struct class *ir_input_class; |
26 | ||
d4b778d3 MCC |
27 | /** |
28 | * show_protocol() - shows the current IR protocol | |
29 | * @d: the device descriptor | |
30 | * @mattr: the device attribute struct (unused) | |
31 | * @buf: a pointer to the output buffer | |
32 | * | |
33 | * This routine is a callback routine for input read the IR protocol type. | |
34 | * it is trigged by reading /sys/class/irrcv/irrcv?/current_protocol. | |
35 | * It returns the protocol name, as understood by the driver. | |
36 | */ | |
53f87022 MCC |
37 | static ssize_t show_protocol(struct device *d, |
38 | struct device_attribute *mattr, char *buf) | |
39 | { | |
40 | char *s; | |
41 | struct ir_input_dev *ir_dev = dev_get_drvdata(d); | |
42 | enum ir_type ir_type = ir_dev->rc_tab.ir_type; | |
43 | ||
44 | IR_dprintk(1, "Current protocol is %ld\n", ir_type); | |
45 | ||
46 | /* FIXME: doesn't support multiple protocols at the same time */ | |
47 | if (ir_type == IR_TYPE_UNKNOWN) | |
48 | s = "Unknown"; | |
49 | else if (ir_type == IR_TYPE_RC5) | |
50 | s = "RC-5"; | |
51 | else if (ir_type == IR_TYPE_PD) | |
52 | s = "Pulse/distance"; | |
53 | else if (ir_type == IR_TYPE_NEC) | |
54 | s = "NEC"; | |
55 | else | |
56 | s = "Other"; | |
57 | ||
58 | return sprintf(buf, "%s\n", s); | |
59 | } | |
60 | ||
d4b778d3 MCC |
61 | /** |
62 | * store_protocol() - shows the current IR protocol | |
63 | * @d: the device descriptor | |
64 | * @mattr: the device attribute struct (unused) | |
65 | * @buf: a pointer to the input buffer | |
66 | * @len: length of the input buffer | |
67 | * | |
68 | * This routine is a callback routine for changing the IR protocol type. | |
69 | * it is trigged by reading /sys/class/irrcv/irrcv?/current_protocol. | |
70 | * It changes the IR the protocol name, if the IR type is recognized | |
71 | * by the driver. | |
72 | * If an unknown protocol name is used, returns -EINVAL. | |
73 | */ | |
09b01b90 MCC |
74 | static ssize_t store_protocol(struct device *d, |
75 | struct device_attribute *mattr, | |
76 | const char *data, | |
77 | size_t len) | |
78 | { | |
79 | struct ir_input_dev *ir_dev = dev_get_drvdata(d); | |
80 | enum ir_type ir_type = IR_TYPE_UNKNOWN; | |
81 | int rc = -EINVAL; | |
82 | char *buf; | |
83 | ||
84 | buf = strsep((char **) &data, "\n"); | |
85 | ||
86 | if (!strcasecmp(buf, "rc-5")) | |
87 | ir_type = IR_TYPE_RC5; | |
88 | else if (!strcasecmp(buf, "pd")) | |
89 | ir_type = IR_TYPE_PD; | |
90 | else if (!strcasecmp(buf, "nec")) | |
91 | ir_type = IR_TYPE_NEC; | |
92 | ||
93 | if (ir_type == IR_TYPE_UNKNOWN) { | |
94 | IR_dprintk(1, "Error setting protocol to %ld\n", ir_type); | |
95 | return -EINVAL; | |
96 | } | |
97 | ||
98 | if (ir_dev->props->change_protocol) | |
99 | rc = ir_dev->props->change_protocol(ir_dev->props->priv, | |
100 | ir_type); | |
101 | ||
102 | if (rc < 0) { | |
103 | IR_dprintk(1, "Error setting protocol to %ld\n", ir_type); | |
104 | return -EINVAL; | |
105 | } | |
106 | ||
107 | ir_dev->rc_tab.ir_type = ir_type; | |
108 | ||
109 | IR_dprintk(1, "Current protocol is %ld\n", ir_type); | |
110 | ||
111 | return len; | |
112 | } | |
113 | ||
d4b778d3 MCC |
114 | /* |
115 | * Static device attribute struct with the sysfs attributes for IR's | |
116 | */ | |
53f87022 | 117 | static DEVICE_ATTR(current_protocol, S_IRUGO | S_IWUSR, |
09b01b90 | 118 | show_protocol, store_protocol); |
4714eda8 MCC |
119 | |
120 | static struct attribute *ir_dev_attrs[] = { | |
53f87022 | 121 | &dev_attr_current_protocol.attr, |
4714eda8 MCC |
122 | }; |
123 | ||
d4b778d3 MCC |
124 | /** |
125 | * ir_register_class() - creates the sysfs for /sys/class/irrcv/irrcv? | |
126 | * @input_dev: the struct input_dev descriptor of the device | |
127 | * | |
128 | * This routine is used to register the syfs code for IR class | |
129 | */ | |
4714eda8 MCC |
130 | int ir_register_class(struct input_dev *input_dev) |
131 | { | |
132 | int rc; | |
133 | struct kobject *kobj; | |
134 | ||
135 | struct ir_input_dev *ir_dev = input_get_drvdata(input_dev); | |
136 | int devno = find_first_zero_bit(&ir_core_dev_number, | |
137 | IRRCV_NUM_DEVICES); | |
138 | ||
139 | if (unlikely(devno < 0)) | |
140 | return devno; | |
141 | ||
142 | ir_dev->attr.attrs = ir_dev_attrs; | |
143 | ir_dev->class_dev = device_create(ir_input_class, NULL, | |
144 | input_dev->dev.devt, ir_dev, | |
145 | "irrcv%d", devno); | |
146 | kobj = &ir_dev->class_dev->kobj; | |
147 | ||
148 | printk(KERN_WARNING "Creating IR device %s\n", kobject_name(kobj)); | |
149 | rc = sysfs_create_group(kobj, &ir_dev->attr); | |
150 | if (unlikely(rc < 0)) { | |
151 | device_destroy(ir_input_class, input_dev->dev.devt); | |
152 | return -ENOMEM; | |
153 | } | |
154 | ||
155 | ir_dev->devno = devno; | |
156 | set_bit(devno, &ir_core_dev_number); | |
157 | ||
158 | return 0; | |
159 | }; | |
160 | ||
d4b778d3 MCC |
161 | /** |
162 | * ir_unregister_class() - removes the sysfs for sysfs for | |
163 | * /sys/class/irrcv/irrcv? | |
164 | * @input_dev: the struct input_dev descriptor of the device | |
165 | * | |
166 | * This routine is used to unregister the syfs code for IR class | |
167 | */ | |
4714eda8 MCC |
168 | void ir_unregister_class(struct input_dev *input_dev) |
169 | { | |
170 | struct ir_input_dev *ir_dev = input_get_drvdata(input_dev); | |
171 | struct kobject *kobj; | |
172 | ||
173 | clear_bit(ir_dev->devno, &ir_core_dev_number); | |
174 | ||
175 | kobj = &ir_dev->class_dev->kobj; | |
176 | ||
177 | sysfs_remove_group(kobj, &ir_dev->attr); | |
178 | device_destroy(ir_input_class, input_dev->dev.devt); | |
179 | ||
180 | kfree(ir_dev->attr.name); | |
181 | } | |
182 | ||
d4b778d3 MCC |
183 | /* |
184 | * Init/exit code for the module. Basically, creates/removes /sys/class/irrcv | |
185 | */ | |
186 | ||
4714eda8 MCC |
187 | static int __init ir_core_init(void) |
188 | { | |
189 | ir_input_class = class_create(THIS_MODULE, "irrcv"); | |
190 | if (IS_ERR(ir_input_class)) { | |
191 | printk(KERN_ERR "ir_core: unable to register irrcv class\n"); | |
192 | return PTR_ERR(ir_input_class); | |
193 | } | |
194 | ||
195 | return 0; | |
196 | } | |
197 | ||
198 | static void __exit ir_core_exit(void) | |
199 | { | |
200 | class_destroy(ir_input_class); | |
201 | } | |
202 | ||
203 | module_init(ir_core_init); | |
204 | module_exit(ir_core_exit); |