1 /* ir-register.c - handle IR scancode->keycode tables
3 * Copyright (C) 2009 by Mauro Carvalho Chehab <mchehab@redhat.com>
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.
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.
15 #include <linux/input.h>
16 #include <linux/device.h>
17 #include <media/ir-core.h>
19 #define IRRCV_NUM_DEVICES 256
21 /* bit array to represent IR sysfs device number */
22 static unsigned long ir_core_dev_number;
24 /* class for /sys/class/irrcv */
25 static struct class *ir_input_class;
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
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.
37 static ssize_t show_protocol(struct device *d,
38 struct device_attribute *mattr, char *buf)
41 struct ir_input_dev *ir_dev = dev_get_drvdata(d);
42 enum ir_type ir_type = ir_dev->rc_tab.ir_type;
44 IR_dprintk(1, "Current protocol is %ld\n", ir_type);
46 /* FIXME: doesn't support multiple protocols at the same time */
47 if (ir_type == IR_TYPE_UNKNOWN)
49 else if (ir_type == IR_TYPE_RC5)
51 else if (ir_type == IR_TYPE_PD)
53 else if (ir_type == IR_TYPE_NEC)
58 return sprintf(buf, "%s\n", s);
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
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
72 * If an unknown protocol name is used, returns -EINVAL.
74 static ssize_t store_protocol(struct device *d,
75 struct device_attribute *mattr,
79 struct ir_input_dev *ir_dev = dev_get_drvdata(d);
80 enum ir_type ir_type = IR_TYPE_UNKNOWN;
84 buf = strsep((char **) &data, "\n");
86 if (!strcasecmp(buf, "rc-5"))
87 ir_type = IR_TYPE_RC5;
88 else if (!strcasecmp(buf, "pd"))
90 else if (!strcasecmp(buf, "nec"))
91 ir_type = IR_TYPE_NEC;
93 if (ir_type == IR_TYPE_UNKNOWN) {
94 IR_dprintk(1, "Error setting protocol to %ld\n", ir_type);
98 if (ir_dev->props->change_protocol)
99 rc = ir_dev->props->change_protocol(ir_dev->props->priv,
103 IR_dprintk(1, "Error setting protocol to %ld\n", ir_type);
107 ir_dev->rc_tab.ir_type = ir_type;
109 IR_dprintk(1, "Current protocol is %ld\n", ir_type);
115 * Static device attribute struct with the sysfs attributes for IR's
117 static DEVICE_ATTR(current_protocol, S_IRUGO | S_IWUSR,
118 show_protocol, store_protocol);
120 static struct attribute *ir_dev_attrs[] = {
121 &dev_attr_current_protocol.attr,
125 * ir_register_class() - creates the sysfs for /sys/class/irrcv/irrcv?
126 * @input_dev: the struct input_dev descriptor of the device
128 * This routine is used to register the syfs code for IR class
130 int ir_register_class(struct input_dev *input_dev)
133 struct kobject *kobj;
135 struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
136 int devno = find_first_zero_bit(&ir_core_dev_number,
139 if (unlikely(devno < 0))
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,
146 kobj = &ir_dev->class_dev->kobj;
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);
155 ir_dev->devno = devno;
156 set_bit(devno, &ir_core_dev_number);
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
166 * This routine is used to unregister the syfs code for IR class
168 void ir_unregister_class(struct input_dev *input_dev)
170 struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
171 struct kobject *kobj;
173 clear_bit(ir_dev->devno, &ir_core_dev_number);
175 kobj = &ir_dev->class_dev->kobj;
177 sysfs_remove_group(kobj, &ir_dev->attr);
178 device_destroy(ir_input_class, input_dev->dev.devt);
180 kfree(ir_dev->attr.name);
184 * Init/exit code for the module. Basically, creates/removes /sys/class/irrcv
187 static int __init ir_core_init(void)
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);
198 static void __exit ir_core_exit(void)
200 class_destroy(ir_input_class);
203 module_init(ir_core_init);
204 module_exit(ir_core_exit);