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/slab.h>
16 #include <linux/input.h>
17 #include <linux/device.h>
18 #include <media/ir-core.h>
20 #define IRRCV_NUM_DEVICES 256
22 /* bit array to represent IR sysfs device number */
23 static unsigned long ir_core_dev_number;
25 /* class for /sys/class/irrcv */
26 static char *ir_devnode(struct device *dev, mode_t *mode)
28 return kasprintf(GFP_KERNEL, "irrcv/%s", dev_name(dev));
31 struct class ir_input_class = {
33 .devnode = ir_devnode,
37 * show_protocol() - shows the current IR protocol
38 * @d: the device descriptor
39 * @mattr: the device attribute struct (unused)
40 * @buf: a pointer to the output buffer
42 * This routine is a callback routine for input read the IR protocol type.
43 * it is trigged by reading /sys/class/irrcv/irrcv?/current_protocol.
44 * It returns the protocol name, as understood by the driver.
46 static ssize_t show_protocol(struct device *d,
47 struct device_attribute *mattr, char *buf)
50 struct ir_input_dev *ir_dev = dev_get_drvdata(d);
51 u64 ir_type = ir_dev->rc_tab.ir_type;
53 IR_dprintk(1, "Current protocol is %lld\n", (long long)ir_type);
55 /* FIXME: doesn't support multiple protocols at the same time */
56 if (ir_type == IR_TYPE_UNKNOWN)
58 else if (ir_type == IR_TYPE_RC5)
60 else if (ir_type == IR_TYPE_PD)
62 else if (ir_type == IR_TYPE_NEC)
67 return sprintf(buf, "%s\n", s);
71 * store_protocol() - shows the current IR protocol
72 * @d: the device descriptor
73 * @mattr: the device attribute struct (unused)
74 * @buf: a pointer to the input buffer
75 * @len: length of the input buffer
77 * This routine is a callback routine for changing the IR protocol type.
78 * it is trigged by reading /sys/class/irrcv/irrcv?/current_protocol.
79 * It changes the IR the protocol name, if the IR type is recognized
81 * If an unknown protocol name is used, returns -EINVAL.
83 static ssize_t store_protocol(struct device *d,
84 struct device_attribute *mattr,
88 struct ir_input_dev *ir_dev = dev_get_drvdata(d);
89 u64 ir_type = IR_TYPE_UNKNOWN;
94 buf = strsep((char **) &data, "\n");
96 if (!strcasecmp(buf, "rc-5"))
97 ir_type = IR_TYPE_RC5;
98 else if (!strcasecmp(buf, "pd"))
100 else if (!strcasecmp(buf, "nec"))
101 ir_type = IR_TYPE_NEC;
103 if (ir_type == IR_TYPE_UNKNOWN) {
104 IR_dprintk(1, "Error setting protocol to %lld\n",
109 if (ir_dev->props && ir_dev->props->change_protocol)
110 rc = ir_dev->props->change_protocol(ir_dev->props->priv,
114 IR_dprintk(1, "Error setting protocol to %lld\n",
119 spin_lock_irqsave(&ir_dev->rc_tab.lock, flags);
120 ir_dev->rc_tab.ir_type = ir_type;
121 spin_unlock_irqrestore(&ir_dev->rc_tab.lock, flags);
123 IR_dprintk(1, "Current protocol is %lld\n",
130 * Static device attribute struct with the sysfs attributes for IR's
132 static DEVICE_ATTR(current_protocol, S_IRUGO | S_IWUSR,
133 show_protocol, store_protocol);
135 static struct attribute *ir_dev_attrs[] = {
136 &dev_attr_current_protocol.attr,
140 static struct attribute_group ir_dev_attr_grp = {
141 .attrs = ir_dev_attrs,
144 static const struct attribute_group *ir_dev_attr_groups[] = {
149 static struct device_type ir_dev_type = {
150 .groups = ir_dev_attr_groups,
155 * ir_register_class() - creates the sysfs for /sys/class/irrcv/irrcv?
156 * @input_dev: the struct input_dev descriptor of the device
158 * This routine is used to register the syfs code for IR class
160 int ir_register_class(struct input_dev *input_dev)
165 struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
166 int devno = find_first_zero_bit(&ir_core_dev_number,
169 if (unlikely(devno < 0))
172 ir_dev->dev.type = &ir_dev_type;
173 ir_dev->dev.class = &ir_input_class;
174 ir_dev->dev.parent = input_dev->dev.parent;
175 dev_set_name(&ir_dev->dev, "irrcv%d", devno);
176 rc = device_register(&ir_dev->dev);
181 input_dev->dev.parent = &ir_dev->dev;
182 rc = input_register_device(input_dev);
184 device_del(&ir_dev->dev);
188 __module_get(THIS_MODULE);
190 path = kobject_get_path(&input_dev->dev.kobj, GFP_KERNEL);
191 printk(KERN_INFO "%s: %s associated with sysfs %s\n",
192 dev_name(&ir_dev->dev),
193 input_dev->name ? input_dev->name : "Unspecified device",
194 path ? path : "N/A");
197 ir_dev->devno = devno;
198 set_bit(devno, &ir_core_dev_number);
204 * ir_unregister_class() - removes the sysfs for sysfs for
205 * /sys/class/irrcv/irrcv?
206 * @input_dev: the struct input_dev descriptor of the device
208 * This routine is used to unregister the syfs code for IR class
210 void ir_unregister_class(struct input_dev *input_dev)
212 struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
214 clear_bit(ir_dev->devno, &ir_core_dev_number);
215 input_unregister_device(input_dev);
216 device_del(&ir_dev->dev);
218 module_put(THIS_MODULE);
222 * Init/exit code for the module. Basically, creates/removes /sys/class/irrcv
225 static int __init ir_core_init(void)
227 int rc = class_register(&ir_input_class);
229 printk(KERN_ERR "ir_core: unable to register irrcv class\n");
236 static void __exit ir_core_exit(void)
238 class_unregister(&ir_input_class);
241 module_init(ir_core_init);
242 module_exit(ir_core_exit);