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/* channel_attr.c
*
* Copyright (C) 2010 - 2013 UNISYS CORPORATION
* All rights reserved.
*
* 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; either version 2 of the License, or (at
* your option) any later version.
*
* 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, GOOD TITLE or
* NON INFRINGEMENT. See the GNU General Public License for more
* details.
*/
/* Implement publishing of channel attributes under:
*
* /sys/bus/visorbus<x>/dev<y>/channel
*
*/
#include "channel_attr.h"
#define CURRENT_FILE_PC VISOR_BUS_PC_channel_attr_c
#define to_channel_attr(_attr) \
container_of(_attr, struct channel_attribute, attr)
#define to_visor_device_from_kobjchannel(obj) \
container_of(obj, struct visor_device, kobjchannel)
struct channel_attribute {
struct attribute attr;
ssize_t (*show)(struct visor_device*, char *buf);
ssize_t (*store)(struct visor_device*, const char *buf, size_t count);
};
/* begin implementation of specific channel attributes to appear under
* /sys/bus/visorbus<x>/dev<y>/channel
*/
static ssize_t devicechannel_attr_physaddr(struct visor_device *dev, char *buf)
{
if (!dev->visorchannel)
return 0;
return snprintf(buf, PAGE_SIZE, "0x%Lx\n",
visorchannel_get_physaddr(dev->visorchannel));
}
static ssize_t devicechannel_attr_nbytes(struct visor_device *dev, char *buf)
{
if (!dev->visorchannel)
return 0;
return snprintf(buf, PAGE_SIZE, "0x%lx\n",
visorchannel_get_nbytes(dev->visorchannel));
}
static ssize_t devicechannel_attr_clientpartition(struct visor_device *dev,
char *buf) {
if (!dev->visorchannel)
return 0;
return snprintf(buf, PAGE_SIZE, "0x%Lx\n",
visorchannel_get_clientpartition(dev->visorchannel));
}
static ssize_t devicechannel_attr_typeguid(struct visor_device *dev, char *buf)
{
char s[99];
if (!dev->visorchannel)
return 0;
return snprintf(buf, PAGE_SIZE, "%s\n",
visorchannel_id(dev->visorchannel, s));
}
static ssize_t devicechannel_attr_zoneguid(struct visor_device *dev, char *buf)
{
char s[99];
if (!dev->visorchannel)
return 0;
return snprintf(buf, PAGE_SIZE, "%s\n",
visorchannel_zoneid(dev->visorchannel, s));
}
static ssize_t devicechannel_attr_typename(struct visor_device *dev, char *buf)
{
int i = 0;
struct bus_type *xbus = dev->device.bus;
struct device_driver *xdrv = dev->device.driver;
struct visor_driver *drv = NULL;
if (!dev->visorchannel || !xbus || !xdrv)
return 0;
i = xbus->match(&dev->device, xdrv);
if (!i)
return 0;
drv = to_visor_driver(xdrv);
return snprintf(buf, PAGE_SIZE, "%s\n", drv->channel_types[i - 1].name);
}
static ssize_t devicechannel_attr_dump(struct visor_device *dev, char *buf)
{
int count = 0;
/* TODO: replace this with debugfs code
struct seq_file *m = NULL;
if (dev->visorchannel == NULL)
return 0;
m = visor_seq_file_new_buffer(buf, PAGE_SIZE - 1);
if (m == NULL)
return 0;
visorchannel_debug(dev->visorchannel, 1, m, 0);
count = m->count;
visor_seq_file_done_buffer(m);
m = NULL;
*/
return count;
}
static struct channel_attribute all_channel_attrs[] = {
__ATTR(physaddr, S_IRUGO,
devicechannel_attr_physaddr, NULL),
__ATTR(nbytes, S_IRUGO,
devicechannel_attr_nbytes, NULL),
__ATTR(clientpartition, S_IRUGO,
devicechannel_attr_clientpartition, NULL),
__ATTR(typeguid, S_IRUGO,
devicechannel_attr_typeguid, NULL),
__ATTR(zoneguid, S_IRUGO,
devicechannel_attr_zoneguid, NULL),
__ATTR(typename, S_IRUGO,
devicechannel_attr_typename, NULL),
__ATTR(dump, S_IRUGO,
devicechannel_attr_dump, NULL),
};
/* end implementation of specific channel attributes */
static ssize_t channel_attr_show(struct kobject *kobj, struct attribute *attr,
char *buf)
{
struct channel_attribute *channel_attr = to_channel_attr(attr);
struct visor_device *dev = to_visor_device_from_kobjchannel(kobj);
ssize_t ret = 0;
if (channel_attr->show)
ret = channel_attr->show(dev, buf);
return ret;
}
static ssize_t channel_attr_store(struct kobject *kobj, struct attribute *attr,
const char *buf, size_t count)
{
struct channel_attribute *channel_attr = to_channel_attr(attr);
struct visor_device *dev = to_visor_device_from_kobjchannel(kobj);
ssize_t ret = 0;
if (channel_attr->store)
ret = channel_attr->store(dev, buf, count);
return ret;
}
static int channel_create_file(struct visor_device *dev,
struct channel_attribute *attr)
{
return sysfs_create_file(&dev->kobjchannel, &attr->attr);
}
static void channel_remove_file(struct visor_device *dev,
struct channel_attribute *attr)
{
sysfs_remove_file(&dev->kobjchannel, &attr->attr);
}
static const struct sysfs_ops channel_sysfs_ops = {
.show = channel_attr_show,
.store = channel_attr_store,
};
static struct kobj_type channel_kobj_type = {
.sysfs_ops = &channel_sysfs_ops
};
int register_channel_attributes(struct visor_device *dev)
{
int rc = 0, i = 0, x = 0;
if (dev->kobjchannel.parent)
goto away; /* already registered */
x = kobject_init_and_add(&dev->kobjchannel, &channel_kobj_type,
&dev->device.kobj, "channel");
if (x < 0) {
rc = x;
goto away;
}
kobject_uevent(&dev->kobjchannel, KOBJ_ADD);
for (i = 0;
i < sizeof(all_channel_attrs) / sizeof(struct channel_attribute);
i++)
x = channel_create_file(dev, &all_channel_attrs[i]);
if (x < 0) {
while (--i >= 0)
channel_remove_file(dev, &all_channel_attrs[i]);
kobject_del(&dev->kobjchannel);
kobject_put(&dev->kobjchannel);
rc = x;
goto away;
}
away:
return rc;
}
void unregister_channel_attributes(struct visor_device *dev)
{
int i = 0;
if (!dev->kobjchannel.parent)
return; /* already unregistered */
for (i = 0;
i < sizeof(all_channel_attrs) / sizeof(struct channel_attribute);
i++)
channel_remove_file(dev, &all_channel_attrs[i]);
kobject_del(&dev->kobjchannel);
kobject_put(&dev->kobjchannel);
dev->kobjchannel.parent = NULL;
}
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