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/* 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/slab.h>
#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);
u64 ir_type = ir_dev->rc_tab.ir_type;
IR_dprintk(1, "Current protocol is %lld\n", (long long)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);
u64 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 %lld\n",
(long long)ir_type);
return -EINVAL;
}
if (ir_dev->props && 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 %lld\n",
(long long)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 %lld\n",
(long long)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,
NULL,
};
/**
* 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);
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