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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 | ||
5a0e3ad6 | 15 | #include <linux/slab.h> |
4714eda8 MCC |
16 | #include <linux/input.h> |
17 | #include <linux/device.h> | |
18 | #include <media/ir-core.h> | |
19 | ||
20 | #define IRRCV_NUM_DEVICES 256 | |
21 | ||
d4b778d3 MCC |
22 | /* bit array to represent IR sysfs device number */ |
23 | static unsigned long ir_core_dev_number; | |
4714eda8 | 24 | |
d4b778d3 | 25 | /* class for /sys/class/irrcv */ |
4714eda8 MCC |
26 | static struct class *ir_input_class; |
27 | ||
d4b778d3 MCC |
28 | /** |
29 | * show_protocol() - shows the current IR protocol | |
30 | * @d: the device descriptor | |
31 | * @mattr: the device attribute struct (unused) | |
32 | * @buf: a pointer to the output buffer | |
33 | * | |
34 | * This routine is a callback routine for input read the IR protocol type. | |
35 | * it is trigged by reading /sys/class/irrcv/irrcv?/current_protocol. | |
36 | * It returns the protocol name, as understood by the driver. | |
37 | */ | |
53f87022 MCC |
38 | static ssize_t show_protocol(struct device *d, |
39 | struct device_attribute *mattr, char *buf) | |
40 | { | |
41 | char *s; | |
42 | struct ir_input_dev *ir_dev = dev_get_drvdata(d); | |
971e8298 | 43 | u64 ir_type = ir_dev->rc_tab.ir_type; |
53f87022 | 44 | |
971e8298 | 45 | IR_dprintk(1, "Current protocol is %lld\n", (long long)ir_type); |
53f87022 MCC |
46 | |
47 | /* FIXME: doesn't support multiple protocols at the same time */ | |
48 | if (ir_type == IR_TYPE_UNKNOWN) | |
49 | s = "Unknown"; | |
50 | else if (ir_type == IR_TYPE_RC5) | |
51 | s = "RC-5"; | |
52 | else if (ir_type == IR_TYPE_PD) | |
53 | s = "Pulse/distance"; | |
54 | else if (ir_type == IR_TYPE_NEC) | |
55 | s = "NEC"; | |
56 | else | |
57 | s = "Other"; | |
58 | ||
59 | return sprintf(buf, "%s\n", s); | |
60 | } | |
61 | ||
d4b778d3 MCC |
62 | /** |
63 | * store_protocol() - shows the current IR protocol | |
64 | * @d: the device descriptor | |
65 | * @mattr: the device attribute struct (unused) | |
66 | * @buf: a pointer to the input buffer | |
67 | * @len: length of the input buffer | |
68 | * | |
69 | * This routine is a callback routine for changing the IR protocol type. | |
70 | * it is trigged by reading /sys/class/irrcv/irrcv?/current_protocol. | |
71 | * It changes the IR the protocol name, if the IR type is recognized | |
72 | * by the driver. | |
73 | * If an unknown protocol name is used, returns -EINVAL. | |
74 | */ | |
09b01b90 MCC |
75 | static ssize_t store_protocol(struct device *d, |
76 | struct device_attribute *mattr, | |
77 | const char *data, | |
78 | size_t len) | |
79 | { | |
80 | struct ir_input_dev *ir_dev = dev_get_drvdata(d); | |
971e8298 | 81 | u64 ir_type = IR_TYPE_UNKNOWN; |
09b01b90 | 82 | int rc = -EINVAL; |
eecee32a | 83 | unsigned long flags; |
09b01b90 MCC |
84 | char *buf; |
85 | ||
86 | buf = strsep((char **) &data, "\n"); | |
87 | ||
88 | if (!strcasecmp(buf, "rc-5")) | |
89 | ir_type = IR_TYPE_RC5; | |
90 | else if (!strcasecmp(buf, "pd")) | |
91 | ir_type = IR_TYPE_PD; | |
92 | else if (!strcasecmp(buf, "nec")) | |
93 | ir_type = IR_TYPE_NEC; | |
94 | ||
95 | if (ir_type == IR_TYPE_UNKNOWN) { | |
971e8298 MCC |
96 | IR_dprintk(1, "Error setting protocol to %lld\n", |
97 | (long long)ir_type); | |
09b01b90 MCC |
98 | return -EINVAL; |
99 | } | |
100 | ||
0f7ff395 | 101 | if (ir_dev->props && ir_dev->props->change_protocol) |
09b01b90 MCC |
102 | rc = ir_dev->props->change_protocol(ir_dev->props->priv, |
103 | ir_type); | |
104 | ||
105 | if (rc < 0) { | |
971e8298 MCC |
106 | IR_dprintk(1, "Error setting protocol to %lld\n", |
107 | (long long)ir_type); | |
09b01b90 MCC |
108 | return -EINVAL; |
109 | } | |
110 | ||
eecee32a | 111 | spin_lock_irqsave(&ir_dev->rc_tab.lock, flags); |
09b01b90 | 112 | ir_dev->rc_tab.ir_type = ir_type; |
eecee32a | 113 | spin_unlock_irqrestore(&ir_dev->rc_tab.lock, flags); |
09b01b90 | 114 | |
971e8298 MCC |
115 | IR_dprintk(1, "Current protocol is %lld\n", |
116 | (long long)ir_type); | |
09b01b90 MCC |
117 | |
118 | return len; | |
119 | } | |
120 | ||
d4b778d3 MCC |
121 | /* |
122 | * Static device attribute struct with the sysfs attributes for IR's | |
123 | */ | |
53f87022 | 124 | static DEVICE_ATTR(current_protocol, S_IRUGO | S_IWUSR, |
09b01b90 | 125 | show_protocol, store_protocol); |
4714eda8 MCC |
126 | |
127 | static struct attribute *ir_dev_attrs[] = { | |
53f87022 | 128 | &dev_attr_current_protocol.attr, |
9714d587 | 129 | NULL, |
4714eda8 MCC |
130 | }; |
131 | ||
d4b778d3 MCC |
132 | /** |
133 | * ir_register_class() - creates the sysfs for /sys/class/irrcv/irrcv? | |
134 | * @input_dev: the struct input_dev descriptor of the device | |
135 | * | |
136 | * This routine is used to register the syfs code for IR class | |
137 | */ | |
4714eda8 MCC |
138 | int ir_register_class(struct input_dev *input_dev) |
139 | { | |
140 | int rc; | |
141 | struct kobject *kobj; | |
142 | ||
143 | struct ir_input_dev *ir_dev = input_get_drvdata(input_dev); | |
144 | int devno = find_first_zero_bit(&ir_core_dev_number, | |
145 | IRRCV_NUM_DEVICES); | |
146 | ||
147 | if (unlikely(devno < 0)) | |
148 | return devno; | |
149 | ||
150 | ir_dev->attr.attrs = ir_dev_attrs; | |
151 | ir_dev->class_dev = device_create(ir_input_class, NULL, | |
152 | input_dev->dev.devt, ir_dev, | |
153 | "irrcv%d", devno); | |
154 | kobj = &ir_dev->class_dev->kobj; | |
155 | ||
156 | printk(KERN_WARNING "Creating IR device %s\n", kobject_name(kobj)); | |
157 | rc = sysfs_create_group(kobj, &ir_dev->attr); | |
158 | if (unlikely(rc < 0)) { | |
159 | device_destroy(ir_input_class, input_dev->dev.devt); | |
160 | return -ENOMEM; | |
161 | } | |
162 | ||
163 | ir_dev->devno = devno; | |
164 | set_bit(devno, &ir_core_dev_number); | |
165 | ||
166 | return 0; | |
167 | }; | |
168 | ||
d4b778d3 MCC |
169 | /** |
170 | * ir_unregister_class() - removes the sysfs for sysfs for | |
171 | * /sys/class/irrcv/irrcv? | |
172 | * @input_dev: the struct input_dev descriptor of the device | |
173 | * | |
174 | * This routine is used to unregister the syfs code for IR class | |
175 | */ | |
4714eda8 MCC |
176 | void ir_unregister_class(struct input_dev *input_dev) |
177 | { | |
178 | struct ir_input_dev *ir_dev = input_get_drvdata(input_dev); | |
179 | struct kobject *kobj; | |
180 | ||
181 | clear_bit(ir_dev->devno, &ir_core_dev_number); | |
182 | ||
183 | kobj = &ir_dev->class_dev->kobj; | |
184 | ||
185 | sysfs_remove_group(kobj, &ir_dev->attr); | |
186 | device_destroy(ir_input_class, input_dev->dev.devt); | |
187 | ||
188 | kfree(ir_dev->attr.name); | |
189 | } | |
190 | ||
d4b778d3 MCC |
191 | /* |
192 | * Init/exit code for the module. Basically, creates/removes /sys/class/irrcv | |
193 | */ | |
194 | ||
4714eda8 MCC |
195 | static int __init ir_core_init(void) |
196 | { | |
197 | ir_input_class = class_create(THIS_MODULE, "irrcv"); | |
198 | if (IS_ERR(ir_input_class)) { | |
199 | printk(KERN_ERR "ir_core: unable to register irrcv class\n"); | |
200 | return PTR_ERR(ir_input_class); | |
201 | } | |
202 | ||
203 | return 0; | |
204 | } | |
205 | ||
206 | static void __exit ir_core_exit(void) | |
207 | { | |
208 | class_destroy(ir_input_class); | |
209 | } | |
210 | ||
211 | module_init(ir_core_init); | |
212 | module_exit(ir_core_exit); |