/usr/src/dahdi-2.10.2~dfsg-1ubuntu1/drivers/dahdi/dahdi-sysfs-chan.c is in dahdi-dkms 1:2.10.2~dfsg-1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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*
* Copyright (C) 2011-2012, Xorcom
* Copyright (C) 2011-2012, Digium, Inc.
*
* All rights reserved.
*
*/
/*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2 as published by the
* Free Software Foundation. See the LICENSE file included with
* this program for more details.
*/
#include <linux/version.h>
#define DAHDI_PRINK_MACROS_USE_debug
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/ctype.h>
#include <dahdi/kernel.h>
#include "dahdi.h"
#include "dahdi-sysfs.h"
/* shortcuts, for code readability */
#define MAKE_DAHDI_DEV(num, name) \
CLASS_DEV_CREATE(dahdi_class, MKDEV(DAHDI_MAJOR, num), NULL, name)
#define DEL_DAHDI_DEV(num) \
CLASS_DEV_DESTROY(dahdi_class, MKDEV(DAHDI_MAJOR, num))
static struct class *dahdi_class;
static dev_t dahdi_channels_devt; /*!< Device number of first channel */
static struct cdev dahdi_channels_cdev; /*!< Channels chardev's */
/*
* Flags to remember what initializations already
* succeeded.
*/
static struct {
u32 channel_driver:1;
u32 channels_bus:1;
u32 cdev:1;
} should_cleanup;
#define chan_attr(field, format_string) \
static BUS_ATTR_READER(field##_show, dev, buf) \
{ \
struct dahdi_chan *chan; \
\
chan = dev_to_chan(dev); \
return sprintf(buf, format_string, chan->field); \
}
chan_attr(name, "%s\n");
chan_attr(channo, "%d\n");
chan_attr(chanpos, "%d\n");
chan_attr(blocksize, "%d\n");
#ifdef OPTIMIZE_CHANMUTE
chan_attr(chanmute, "%d\n");
#endif
static BUS_ATTR_READER(sigcap_show, dev, buf)
{
struct dahdi_chan *chan;
int len = 0;
int i;
uint sigtypes[] = {
DAHDI_SIG_FXSLS,
DAHDI_SIG_FXSGS,
DAHDI_SIG_FXSKS,
DAHDI_SIG_FXOLS,
DAHDI_SIG_FXOGS,
DAHDI_SIG_FXOKS,
DAHDI_SIG_EM,
DAHDI_SIG_CLEAR,
DAHDI_SIG_HDLCRAW,
DAHDI_SIG_HDLCFCS,
DAHDI_SIG_HDLCNET,
DAHDI_SIG_SLAVE,
DAHDI_SIG_SF,
DAHDI_SIG_CAS,
DAHDI_SIG_EM_E1,
DAHDI_SIG_DACS_RBS,
DAHDI_SIG_HARDHDLC,
DAHDI_SIG_MTP2,
};
chan = dev_to_chan(dev);
for (i = 0; i < ARRAY_SIZE(sigtypes); i++) {
uint x = chan->sigcap & sigtypes[i];
if (x == sigtypes[i])
len += sprintf(buf + len, "%s ", sigstr(x));
}
while (len > 0 && isspace(buf[len - 1])) /* trim */
len--;
len += sprintf(buf + len, "\n");
return len;
}
static BUS_ATTR_READER(sig_show, dev, buf)
{
struct dahdi_chan *chan;
chan = dev_to_chan(dev);
return sprintf(buf, "%s\n", sigstr(chan->sig));
}
static BUS_ATTR_READER(in_use_show, dev, buf)
{
struct dahdi_chan *chan;
chan = dev_to_chan(dev);
return sprintf(buf, "%d\n", test_bit(DAHDI_FLAGBIT_OPEN, &chan->flags));
}
static BUS_ATTR_READER(alarms_show, dev, buf)
{
struct dahdi_chan *chan;
int len;
chan = dev_to_chan(dev);
len = fill_alarm_string(buf, PAGE_SIZE, chan->chan_alarms);
buf[len++] = '\n';
return len;
}
static BUS_ATTR_READER(ec_factory_show, dev, buf)
{
struct dahdi_chan *chan;
int len = 0;
chan = dev_to_chan(dev);
if (chan->ec_factory)
len += sprintf(buf, "%s", chan->ec_factory->get_name(chan));
buf[len++] = '\n';
return len;
}
static BUS_ATTR_READER(ec_state_show, dev, buf)
{
struct dahdi_chan *chan;
int len = 0;
chan = dev_to_chan(dev);
if (chan->ec_factory)
len += sprintf(buf, "%sACTIVE", (chan->ec_state) ? "" : "IN");
buf[len++] = '\n';
return len;
}
static struct device_attribute chan_dev_attrs[] = {
__ATTR_RO(name),
__ATTR_RO(channo),
__ATTR_RO(chanpos),
__ATTR_RO(sig),
__ATTR_RO(sigcap),
__ATTR_RO(alarms),
__ATTR_RO(ec_factory),
__ATTR_RO(ec_state),
__ATTR_RO(blocksize),
#ifdef OPTIMIZE_CHANMUTE
__ATTR_RO(chanmute),
#endif
__ATTR_RO(in_use),
__ATTR_NULL,
};
static void chan_release(struct device *dev)
{
struct dahdi_chan *chan;
BUG_ON(!dev);
chan = dev_to_chan(dev);
chan_dbg(DEVICES, chan, "SYSFS\n");
}
static int chan_match(struct device *dev, struct device_driver *driver)
{
struct dahdi_chan *chan;
chan = dev_to_chan(dev);
chan_dbg(DEVICES, chan, "SYSFS\n");
return 1;
}
static struct bus_type chan_bus_type = {
.name = "dahdi_channels",
.match = chan_match,
.dev_attrs = chan_dev_attrs,
};
static int chan_probe(struct device *dev)
{
struct dahdi_chan *chan;
chan = dev_to_chan(dev);
chan_dbg(DEVICES, chan, "SYSFS\n");
return 0;
}
static int chan_remove(struct device *dev)
{
struct dahdi_chan *chan;
chan = dev_to_chan(dev);
chan_dbg(DEVICES, chan, "SYSFS\n");
return 0;
}
static struct device_driver chan_driver = {
.name = "dahdi",
.bus = &chan_bus_type,
#ifndef OLD_HOTPLUG_SUPPORT
.owner = THIS_MODULE,
#endif
.probe = chan_probe,
.remove = chan_remove
};
int chan_sysfs_create(struct dahdi_chan *chan)
{
struct device *dev;
struct dahdi_span *span;
int res;
dev_t devt;
chan_dbg(DEVICES, chan, "Creating channel %d\n", chan->channo);
if (test_bit(DAHDI_FLAGBIT_DEVFILE, &chan->flags))
return 0;
span = chan->span;
devt = MKDEV(MAJOR(dahdi_channels_devt), chan->channo);
dev = &chan->chan_device;
memset(dev, 0, sizeof(*dev));
dev->devt = devt;
dev->bus = &chan_bus_type;
dev->parent = span->span_device;
/*
* FIXME: the name cannot be longer than KOBJ_NAME_LEN
*/
dev_set_name(dev, "dahdi!chan!%03d!%03d", span->spanno, chan->chanpos);
dev_set_drvdata(dev, chan);
dev->release = chan_release;
res = device_register(dev);
if (res) {
chan_err(chan, "%s: device_register failed: %d\n",
__func__, res);
put_device(dev);
return res;
}
set_bit(DAHDI_FLAGBIT_DEVFILE, &chan->flags);
return 0;
}
void chan_sysfs_remove(struct dahdi_chan *chan)
{
struct device *dev = &chan->chan_device;
chan_dbg(DEVICES, chan, "Destroying channel %d\n", chan->channo);
if (!dev_get_drvdata(dev))
return;
if (!test_bit(DAHDI_FLAGBIT_DEVFILE, &chan->flags))
return;
dev = &chan->chan_device;
BUG_ON(dev_get_drvdata(dev) != chan);
device_unregister(dev);
/* FIXME: should have been done earlier in dahdi_chan_unreg */
chan->channo = -1;
clear_bit(DAHDI_FLAGBIT_DEVFILE, &chan->flags);
}
/*
* Used by dahdi_transcode.c
*/
int dahdi_register_chardev(struct dahdi_chardev *dev)
{
static const char *DAHDI_STRING = "dahdi!";
char *udevname;
udevname = kzalloc(strlen(dev->name) + sizeof(DAHDI_STRING) + 1,
GFP_KERNEL);
if (!udevname)
return -ENOMEM;
strcpy(udevname, DAHDI_STRING);
strcat(udevname, dev->name);
MAKE_DAHDI_DEV(dev->minor, udevname);
kfree(udevname);
return 0;
}
EXPORT_SYMBOL(dahdi_register_chardev);
/*
* Used by dahdi_transcode.c
*/
int dahdi_unregister_chardev(struct dahdi_chardev *dev)
{
DEL_DAHDI_DEV(dev->minor);
return 0;
}
EXPORT_SYMBOL(dahdi_unregister_chardev);
/*--------- Sysfs Device handling ----*/
/*
* Describe fixed device files and maintain their
* pointer so fixed_devfiles_remove() can always be called
* and work cleanly
*/
static struct {
int minor;
char *name;
void *dev; /* FIXME: wrong type because of old kernels */
} fixed_minors[] = {
{ DAHDI_CTL, "dahdi!ctl", },
{ DAHDI_TIMER, "dahdi!timer", },
{ DAHDI_CHANNEL, "dahdi!channel",},
{ DAHDI_PSEUDO, "dahdi!pseudo", },
};
/*
* Removes /dev/dahdi/{ctl,timer,channel,pseudo}
*
* It is safe to call it during initialization error handling,
* as it skips non existing objects.
*/
static void fixed_devfiles_remove(void)
{
int i;
if (!dahdi_class)
return;
for (i = 0; i < ARRAY_SIZE(fixed_minors); i++) {
void *d = fixed_minors[i].dev;
if (d && !IS_ERR(d))
dahdi_dbg(DEVICES, "Removing fixed device file %s\n",
fixed_minors[i].name);
DEL_DAHDI_DEV(fixed_minors[i].minor);
}
}
/*
* Creates /dev/dahdi/{ctl,timer,channel,pseudo}
*/
static int fixed_devfiles_create(void)
{
int i;
int res = 0;
if (!dahdi_class) {
dahdi_err("%s: dahdi_class is not initialized yet!\n",
__func__);
res = -ENODEV;
goto cleanup;
}
for (i = 0; i < ARRAY_SIZE(fixed_minors); i++) {
char *name = fixed_minors[i].name;
int minor = fixed_minors[i].minor;
void *dummy;
dahdi_dbg(DEVICES, "Making fixed device file %s\n", name);
dummy = (void *)MAKE_DAHDI_DEV(minor, name);
if (IS_ERR(dummy)) {
int res = PTR_ERR(dummy);
dahdi_err("%s: failed (%d: %s). Error: %d\n",
__func__, minor, name, res);
goto cleanup;
}
fixed_minors[i].dev = dummy;
}
return 0;
cleanup:
fixed_devfiles_remove();
return res;
}
/*
* Called during driver unload and while handling any error during
* driver load.
* Always clean any (and only) objects that were initialized (invariant)
*/
static void sysfs_channels_cleanup(void)
{
if (should_cleanup.cdev) {
dahdi_dbg(DEVICES, "removing channels cdev\n");
cdev_del(&dahdi_channels_cdev);
should_cleanup.cdev = 0;
}
if (dahdi_channels_devt) {
dahdi_dbg(DEVICES, "unregistering chrdev_region\n");
unregister_chrdev_region(dahdi_channels_devt,
DAHDI_MAX_CHANNELS);
}
fixed_devfiles_remove();
if (dahdi_class) {
dahdi_dbg(DEVICES, "Destroying DAHDI class:\n");
class_destroy(dahdi_class);
dahdi_class = NULL;
}
if (should_cleanup.channel_driver) {
dahdi_dbg(DEVICES, "Removing channel driver\n");
driver_unregister(&chan_driver);
should_cleanup.channel_driver = 0;
}
if (should_cleanup.channels_bus) {
dahdi_dbg(DEVICES, "Removing channels bus\n");
bus_unregister(&chan_bus_type);
should_cleanup.channels_bus = 0;
}
}
int __init dahdi_sysfs_chan_init(const struct file_operations *fops)
{
int res = 0;
dahdi_dbg(DEVICES, "Registering channels bus\n");
res = bus_register(&chan_bus_type);
if (res) {
dahdi_err("%s: bus_register(%s) failed. Error number %d\n",
__func__, chan_bus_type.name, res);
goto cleanup;
}
should_cleanup.channels_bus = 1;
dahdi_dbg(DEVICES, "Registering channel driver\n");
res = driver_register(&chan_driver);
if (res) {
dahdi_err("%s: driver_register(%s) failed. Error number %d",
__func__, chan_driver.name, res);
goto cleanup;
}
should_cleanup.channel_driver = 1;
dahdi_class = class_create(THIS_MODULE, "dahdi");
if (IS_ERR(dahdi_class)) {
res = PTR_ERR(dahdi_class);
dahdi_err("%s: class_create(dahi_chan) failed. Error: %d\n",
__func__, res);
goto cleanup;
}
res = fixed_devfiles_create();
if (res)
goto cleanup;
dahdi_dbg(DEVICES, "allocating chrdev_region\n");
res = alloc_chrdev_region(&dahdi_channels_devt,
0,
DAHDI_MAX_CHANNELS,
"dahdi_channels");
if (res) {
dahdi_err("%s: Failed allocating chrdev for %d channels (%d)",
__func__, DAHDI_MAX_CHANNELS, res);
goto cleanup;
}
dahdi_dbg(DEVICES, "adding channels cdev\n");
cdev_init(&dahdi_channels_cdev, fops);
res = cdev_add(&dahdi_channels_cdev, dahdi_channels_devt,
DAHDI_MAX_CHANNELS);
if (res) {
dahdi_err("%s: cdev_add() failed (%d)", __func__, res);
goto cleanup;
}
should_cleanup.cdev = 1;
return 0;
cleanup:
sysfs_channels_cleanup();
return res;
}
void dahdi_sysfs_chan_exit(void)
{
sysfs_channels_cleanup();
}
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