/* ir-sysfs.c - sysfs interface for RC devices (/sys/class/rc)
*
* Copyright (C) 2009-2010 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 "ir-core-priv.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/rc */
static char *ir_devnode(struct device *dev, mode_t *mode)
{
return kasprintf(GFP_KERNEL, "rc/%s", dev_name(dev));
}
static struct class ir_input_class = {
.name = "rc",
.devnode = ir_devnode,
};
static struct {
u64 type;
char *name;
} proto_names[] = {
{ IR_TYPE_UNKNOWN, "unknown" },
{ IR_TYPE_RC5, "rc-5" },
{ IR_TYPE_NEC, "nec" },
{ IR_TYPE_RC6, "rc-6" },
{ IR_TYPE_JVC, "jvc" },
{ IR_TYPE_SONY, "sony" },
{ IR_TYPE_RC5_SZ, "rc-5-sz" },
{ IR_TYPE_LIRC, "lirc" },
};
#define PROTO_NONE "none"
/**
* show_protocols() - shows the current IR protocol(s)
* @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(s).
* it is trigged by reading /sys/class/rc/rc?/protocols.
* It returns the protocol names of supported protocols.
* Enabled protocols are printed in brackets.
*/
static ssize_t show_protocols(struct device *d,
struct device_attribute *mattr, char *buf)
{
struct ir_input_dev *ir_dev = dev_get_drvdata(d);
u64 allowed, enabled;
char *tmp = buf;
int i;
/* Device is being removed */
if (!ir_dev)
return -EINVAL;
if (ir_dev->props && ir_dev->props->driver_type == RC_DRIVER_SCANCODE) {
enabled = ir_dev->rc_tab.ir_type;
allowed = ir_dev->props->allowed_protos;
} else if (ir_dev->raw) {
enabled = ir_dev->raw->enabled_protocols;
allowed = ir_raw_get_allowed_protocols();
} else
return sprintf(tmp, "[builtin]\n");
IR_dprintk(1, "allowed - 0x%llx, enabled - 0x%llx\n",
(long long)allowed,
(long long)enabled);
for (i = 0; i < ARRAY_SIZE(proto_names); i++) {
if (allowed & enabled & proto_names[i].type)
tmp += sprintf(tmp, "[%s] ", proto_names[i].name);
else if (allowed & proto_names[i].type)
tmp += sprintf(tmp, "%s ", proto_names[i].name);
}
if (tmp != buf)
tmp--;
*tmp = '\n';
return tmp + 1 - buf;
}
/**
* store_protocols() - changes the current IR protocol(s)
* @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 writing to /sys/class/rc/rc?/protocols.
* Writing "+proto" will add a protocol to the list of enabled protocols.
* Writing "-proto" will remove a protocol from the list of enabled protocols.
* Writing "proto" will enable only "proto".
* Writing "none" will disable all protocols.
* Returns -EINVAL if an invalid protocol combination or unknown protocol name
* is used, otherwise @len.
*/
static ssize_t store_protocols(struct device *d,
struct device_attribute *mattr,
const char *data,
size_t len)
{
struct ir_input_dev *ir_dev = dev_get_drvdata(d);
bool enable, disable;
const char *tmp;
u64 type;
u64 mask;
int rc, i, count = 0;
unsigned long flags;
/* Device is being removed */
if (!ir_dev)
return -EINVAL;
if (ir_dev->props && ir_dev->props->driver_type == RC_DRIVER_SCANCODE)
type = ir_dev->rc_tab.ir_type;
else if (ir_dev->raw)
type = ir_dev->raw->enabled_protocols;
else {
IR_dprintk(1, "Protocol switching not supported\n");
return -EINVAL;
}
while ((tmp = strsep((char **) &data, " \n")) != NULL) {
if (!*tmp)
break;
if (*tmp == '+') {
enable = true;
disable = false;
tmp++;
} else if (*tmp == '-') {
enable = false;
disable = true;
tmp++;
} else {
enable = false;
disable = false;
}
if (!enable && !disable && !strncasecmp(tmp, PROTO_NONE, sizeof(PROTO_NONE))) {
tmp += sizeof(PROTO_NONE);
mask = 0;
count++;
} else {
for (i = 0; i < ARRAY_SIZE(proto_names); i++) {
if (!strncasecmp(tmp, proto_names[i].name, strlen(proto_names[i].name))) {
tmp += strlen(proto_names[i].name);
mask = proto_names[i].type;
break;
}
}
if (i == ARRAY_SIZE(proto_names)) {
IR_dprintk(1, "Unknown protocol: '%s'\n", tmp);
return -EINVAL;
}
count++;
}
if (enable)
type |= mask;
else if (disable)
type &= ~mask;
else
type = mask;
}
if (!count) {
IR_dprintk(1, "Protocol not specified\n");
return -EINVAL;
}
if (ir_dev->props && ir_dev->props->change_protocol) {
rc = ir_dev->props->change_protocol(ir_dev->props->priv,
type);
if (rc < 0) {
IR_dprintk(1, "Error setting protocols to 0x%llx\n",
(long long)type);
return -EINVAL;
}
}
if (ir_dev->props && ir_dev->props->driver_type == RC_DRIVER_SCANCODE) {
spin_lock_irqsave(&ir_dev->rc_tab.lock, flags);
ir_dev->rc_tab.ir_type = type;
spin_unlock_irqrestore(&ir_dev->rc_tab.lock, flags);
} else {
ir_dev->raw->enabled_protocols = type;
}
IR_dprintk(1, "Current protocol(s): 0x%llx\n",
(long long)type);
return len;
}
#define ADD_HOTPLUG_VAR(fmt, val...) \
do { \
int err = add_uevent_var(env, fmt, val); \
if (err) \
return err; \
} while (0)
static int rc_dev_uevent(struct device *device, struct kobj_uevent_env *env)
{
struct ir_input_dev *ir_dev = dev_get_drvdata(device);
if (ir_dev->rc_tab.name)
ADD_HOTPLUG_VAR("NAME=%s", ir_dev->rc_tab.name);
if (ir_dev->driver_name)
ADD_HOTPLUG_VAR("DRV_NAME=%s", ir_dev->driver_name);
return 0;
}
/*
* Static device attribute struct with the sysfs attributes for IR's
*/
static DEVICE_ATTR(protocols, S_IRUGO | S_IWUSR,
show_protocols, store_protocols);
static struct attribute *rc_dev_attrs[] = {
&dev_attr_protocols.attr,
NULL,
};
static struct attribute_group rc_dev_attr_grp = {
.attrs = rc_dev_attrs,
};
static const struct attribute_group *rc_dev_attr_groups[] = {
&rc_dev_attr_grp,
NULL
};
static struct device_type rc_dev_type = {
.groups = rc_dev_attr_groups,
.uevent = rc_dev_uevent,
};
/**
* ir_register_class() - creates the sysfs for /sys/class/rc/rc?
* @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)
{
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->dev.type = &rc_dev_type;
ir_dev->devno = devno;
ir_dev->dev.class = &ir_input_class;
ir_dev->dev.parent = input_dev->dev.parent;
input_dev->dev.parent = &ir_dev->dev;
dev_set_name(&ir_dev->dev, "rc%d", devno);
dev_set_drvdata(&ir_dev->dev, ir_dev);
return device_register(&ir_dev->dev);
};
/**
* ir_register_input - registers ir input device with input subsystem
* @input_dev: the struct input_dev descriptor of the device
*/
int ir_register_input(struct input_dev *input_dev)
{
struct ir_input_dev *ir_dev = input_get_drvdata(input_dev);
int rc;
const char *path;
rc = input_register_device(input_dev);
if (rc < 0) {
device_del(&ir_dev->dev);
return rc;
}
__module_get(THIS_MODULE);
path = kobject_get_path(&ir_dev->dev.kobj, GFP_KERNEL);
printk(KERN_INFO "%s: %s as %s\n",
dev_name(&ir_dev->dev),
input_dev->name ? input_dev->name : "Unspecified device",
path ? path : "N/A");
kfree(path);
set_bit(ir_dev->devno, &ir_core_dev_number);
return 0;
}
/**
* ir_unregister_class() - removes the sysfs for sysfs for
* /sys/class/rc/rc?
* @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);
input_set_drvdata(input_dev, NULL);
clear_bit(ir_dev->devno, &ir_core_dev_number);
input_unregister_device(input_dev);
device_del(&ir_dev->dev);
module_put(THIS_MODULE);
}
/*
* Init/exit code for the module. Basically, creates/removes /sys/class/rc
*/
static int __init ir_core_init(void)
{
int rc = class_register(&ir_input_class);
if (rc) {
printk(KERN_ERR "ir_core: unable to register rc class\n");
return rc;
}
/* Initialize/load the decoders/keymap code that will be used */
ir_raw_init();
ir_rcmap_init();
return 0;
}
static void __exit ir_core_exit(void)
{
class_unregister(&ir_input_class);
ir_rcmap_cleanup();
}
module_init(ir_core_init);
module_exit(ir_core_exit);
