/usr/src/dahdi-2.10.2~dfsg-1ubuntu1/drivers/dahdi/dahdi-sysfs.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/kernel.h>
#include <linux/version.h>
#define DAHDI_PRINK_MACROS_USE_debug
#include <dahdi/kernel.h>
#include <linux/device.h>
#include <linux/slab.h>
#include <linux/ctype.h>
#include "dahdi.h"
#include "dahdi-sysfs.h"
static char *initdir;
module_param(initdir, charp, 0444);
MODULE_PARM_DESC(initdir,
"deprecated, should use <tools_rootdir>/usr/share/dahdi");
static char *tools_rootdir;
module_param(tools_rootdir, charp, 0444);
MODULE_PARM_DESC(tools_rootdir,
"root directory of all tools paths (default /)");
static int span_match(struct device *dev, struct device_driver *driver)
{
return 1;
}
static inline struct dahdi_span *dev_to_span(struct device *dev)
{
return dev_get_drvdata(dev);
}
#define SPAN_VAR_BLOCK \
do { \
DAHDI_ADD_UEVENT_VAR("DAHDI_TOOLS_ROOTDIR=%s", tools_rootdir); \
DAHDI_ADD_UEVENT_VAR("DAHDI_INIT_DIR=%s/%s", tools_rootdir, \
initdir); \
DAHDI_ADD_UEVENT_VAR("SPAN_NUM=%d", span->spanno); \
DAHDI_ADD_UEVENT_VAR("SPAN_NAME=%s", span->name); \
} while (0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 24)
#define DAHDI_ADD_UEVENT_VAR(fmt, val...) \
do { \
int err = add_uevent_var(envp, num_envp, &i, \
buffer, buffer_size, &len, \
fmt, val); \
if (err) \
return err; \
} while (0)
static int span_uevent(struct device *dev, char **envp, int num_envp,
char *buffer, int buffer_size)
{
struct dahdi_span *span;
int i = 0;
int len = 0;
if (!dev)
return -ENODEV;
span = dev_to_span(dev);
if (!span)
return -ENODEV;
dahdi_dbg(GENERAL, "SYFS dev_name=%s span=%s\n",
dev_name(dev), span->name);
SPAN_VAR_BLOCK;
envp[i] = NULL;
return 0;
}
#else
#define DAHDI_ADD_UEVENT_VAR(fmt, val...) \
do { \
int err = add_uevent_var(kenv, fmt, val); \
if (err) \
return err; \
} while (0)
static int span_uevent(struct device *dev, struct kobj_uevent_env *kenv)
{
struct dahdi_span *span;
if (!dev)
return -ENODEV;
span = dev_to_span(dev);
if (!span)
return -ENODEV;
dahdi_dbg(GENERAL, "SYFS dev_name=%s span=%s\n",
dev_name(dev), span->name);
SPAN_VAR_BLOCK;
return 0;
}
#endif
#define span_attr(field, format_string) \
static BUS_ATTR_READER(field##_show, dev, buf) \
{ \
struct dahdi_span *span; \
\
span = dev_to_span(dev); \
return sprintf(buf, format_string, span->field); \
}
span_attr(name, "%s\n");
span_attr(desc, "%s\n");
span_attr(alarms, "0x%x\n");
span_attr(lbo, "%d\n");
span_attr(syncsrc, "%d\n");
static BUS_ATTR_READER(spantype_show, dev, buf)
{
struct dahdi_span *span;
span = dev_to_span(dev);
return sprintf(buf, "%s\n", dahdi_spantype2str(span->spantype));
}
static BUS_ATTR_READER(local_spanno_show, dev, buf)
{
struct dahdi_span *span;
span = dev_to_span(dev);
return sprintf(buf, "%d\n", local_spanno(span));
}
static BUS_ATTR_READER(is_digital_show, dev, buf)
{
struct dahdi_span *span;
span = dev_to_span(dev);
return sprintf(buf, "%d\n", dahdi_is_digital_span(span));
}
static BUS_ATTR_READER(is_sync_master_show, dev, buf)
{
struct dahdi_span *span;
span = dev_to_span(dev);
return sprintf(buf, "%d\n", dahdi_is_sync_master(span));
}
static BUS_ATTR_READER(basechan_show, dev, buf)
{
struct dahdi_span *span;
span = dev_to_span(dev);
if (!span->channels)
return -ENODEV;
return sprintf(buf, "%d\n", span->chans[0]->channo);
}
static BUS_ATTR_READER(channels_show, dev, buf)
{
struct dahdi_span *span;
span = dev_to_span(dev);
return sprintf(buf, "%d\n", span->channels);
}
static BUS_ATTR_READER(lineconfig_show, dev, buf)
{
struct dahdi_span *span;
int len = 0;
span = dev_to_span(dev);
len += lineconfig_str(span->lineconfig, buf, 20);
len += sprintf(buf + len, "\n");
return len;
}
static BUS_ATTR_READER(linecompat_show, dev, buf)
{
struct dahdi_span *span;
int bit;
int len = 0;
span = dev_to_span(dev);
for (bit = 4; bit <= 12; bit++) {
if (span->linecompat & (1 << bit)) {
const char *name = dahdi_lineconfig_bit_name(bit);
if (name)
len += sprintf(buf + len, "%s ", name);
}
}
/* chomp */
while (len > 0 && isspace(buf[len - 1]))
buf[--len] = '\0';
len += sprintf(buf + len, "\n");
return len;
}
static struct device_attribute span_dev_attrs[] = {
__ATTR_RO(name),
__ATTR_RO(desc),
__ATTR_RO(spantype),
__ATTR_RO(local_spanno),
__ATTR_RO(alarms),
__ATTR_RO(lbo),
__ATTR_RO(syncsrc),
__ATTR_RO(is_digital),
__ATTR_RO(is_sync_master),
__ATTR_RO(basechan),
__ATTR_RO(channels),
__ATTR_RO(lineconfig),
__ATTR_RO(linecompat),
__ATTR_NULL,
};
static ssize_t master_span_show(struct device_driver *driver, char *buf)
{
struct dahdi_span *s = get_master_span();
return snprintf(buf, PAGE_SIZE, "%d\n", (s) ? s->spanno : 0);
}
static ssize_t master_span_store(struct device_driver *driver, const char *buf,
size_t count)
{
int spanno;
if (sscanf(buf, "%d", &spanno) != 1) {
module_printk(KERN_ERR, "non-numeric input '%s'\n", buf);
return -EINVAL;
}
set_master_span(spanno);
return count;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
static struct driver_attribute dahdi_attrs[] = {
__ATTR(master_span, S_IRUGO | S_IWUSR, master_span_show,
master_span_store),
__ATTR_NULL,
};
#else
static DRIVER_ATTR_RW(master_span);
static struct attribute *dahdi_attrs[] = {
&driver_attr_master_span.attr,
NULL,
};
ATTRIBUTE_GROUPS(dahdi);
#endif
static struct bus_type spans_bus_type = {
.name = "dahdi_spans",
.match = span_match,
.uevent = span_uevent,
.dev_attrs = span_dev_attrs,
#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 13, 0)
.drv_attrs = dahdi_attrs,
#else
.drv_groups = dahdi_groups,
#endif
};
static int span_probe(struct device *dev)
{
struct dahdi_span *span;
span = dev_to_span(dev);
span_dbg(DEVICES, span, "\n");
return 0;
}
static int span_remove(struct device *dev)
{
struct dahdi_span *span;
span = dev_to_span(dev);
span_dbg(DEVICES, span, "\n");
return 0;
}
static struct device_driver dahdi_driver = {
.name = "generic_lowlevel",
.bus = &spans_bus_type,
.probe = span_probe,
.remove = span_remove,
.owner = THIS_MODULE
};
static void span_uevent_send(struct dahdi_span *span, enum kobject_action act)
{
struct kobject *kobj;
kobj = &span->span_device->kobj;
span_dbg(DEVICES, span, "SYFS dev_name=%s action=%d\n",
dev_name(span->span_device), act);
kobject_uevent(kobj, act);
}
static void span_release(struct device *dev)
{
dahdi_dbg(DEVICES, "%s: %s\n", __func__, dev_name(dev));
}
void span_sysfs_remove(struct dahdi_span *span)
{
struct device *span_device;
int x;
span_dbg(DEVICES, span, "\n");
span_device = span->span_device;
if (!span_device)
return;
for (x = 0; x < span->channels; x++)
chan_sysfs_remove(span->chans[x]);
if (!dev_get_drvdata(span_device))
return;
/* Grab an extra reference to the device since we'll still want it
* after we've unregistered it */
get_device(span_device);
span_uevent_send(span, KOBJ_OFFLINE);
sysfs_remove_link(&span_device->kobj, "ddev");
device_unregister(span->span_device);
dev_set_drvdata(span_device, NULL);
span_device->parent = NULL;
put_device(span_device);
memset(&span->span_device, 0, sizeof(span->span_device));
kfree(span->span_device);
span->span_device = NULL;
}
int span_sysfs_create(struct dahdi_span *span)
{
struct device *span_device;
int res = 0;
int x;
if (span->span_device) {
WARN_ON(1);
return -EEXIST;
}
span->span_device = kzalloc(sizeof(*span->span_device), GFP_KERNEL);
if (!span->span_device)
return -ENOMEM;
span_device = span->span_device;
span_dbg(DEVICES, span, "\n");
span_device->bus = &spans_bus_type;
span_device->parent = &span->parent->dev;
dev_set_name(span_device, "span-%d", span->spanno);
dev_set_drvdata(span_device, span);
span_device->release = span_release;
res = device_register(span_device);
if (res) {
span_err(span, "%s: device_register failed: %d\n", __func__,
res);
kfree(span->span_device);
span->span_device = NULL;
goto cleanup;
}
res = sysfs_create_link(&span_device->kobj, &span_device->parent->kobj,
"ddev");
if (res) {
span_err(span, "%s: sysfs_create_link failed: %d\n", __func__,
res);
kfree(span->span_device);
span->span_device = NULL;
goto cleanup;
}
for (x = 0; x < span->channels; x++) {
res = chan_sysfs_create(span->chans[x]);
if (res)
goto cleanup;
}
return 0;
cleanup:
span_sysfs_remove(span);
return res;
}
/* Only used to flag that the device exists: */
static struct {
unsigned int clean_dahdi_driver:1;
unsigned int clean_span_bus_type:1;
unsigned int clean_device_bus:1;
unsigned int clean_chardev:1;
} should_cleanup;
static inline struct dahdi_device *to_ddev(struct device *dev)
{
return container_of(dev, struct dahdi_device, dev);
}
#define DEVICE_VAR_BLOCK \
do { \
DAHDI_ADD_UEVENT_VAR("DAHDI_TOOLS_ROOTDIR=%s", tools_rootdir); \
DAHDI_ADD_UEVENT_VAR("DAHDI_INIT_DIR=%s/%s", tools_rootdir, \
initdir); \
DAHDI_ADD_UEVENT_VAR("DAHDI_DEVICE_HWID=%s", \
ddev->hardware_id); \
DAHDI_ADD_UEVENT_VAR("DAHDI_DEVICE_LOCATION=%s", \
ddev->location); \
} while (0)
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 24)
#define DAHDI_ADD_UEVENT_VAR(fmt, val...) \
do { \
int err = add_uevent_var(envp, num_envp, &i, \
buffer, buffer_size, &len, \
fmt, val); \
if (err) \
return err; \
} while (0)
static int device_uevent(struct device *dev, char **envp, int num_envp,
char *buffer, int buffer_size)
{
struct dahdi_device *ddev;
int i = 0;
int len = 0;
if (!dev)
return -ENODEV;
ddev = to_ddev(dev);
if (!ddev)
return -ENODEV;
dahdi_dbg(GENERAL, "SYFS dev_name=%s\n", dev_name(dev));
DEVICE_VAR_BLOCK;
envp[i] = NULL;
return 0;
}
#else
#define DAHDI_ADD_UEVENT_VAR(fmt, val...) \
do { \
int err = add_uevent_var(kenv, fmt, val); \
if (err) \
return err; \
} while (0)
static int device_uevent(struct device *dev, struct kobj_uevent_env *kenv)
{
struct dahdi_device *ddev;
if (!dev)
return -ENODEV;
ddev = to_ddev(dev);
if (!ddev)
return -ENODEV;
dahdi_dbg(GENERAL, "SYFS dev_name=%s\n", dev_name(dev));
DEVICE_VAR_BLOCK;
return 0;
}
#endif
static ssize_t
dahdi_device_manufacturer_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dahdi_device *ddev = to_ddev(dev);
return sprintf(buf, "%s\n", ddev->manufacturer);
}
static ssize_t
dahdi_device_type_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dahdi_device *ddev = to_ddev(dev);
return sprintf(buf, "%s\n", ddev->devicetype);
}
static ssize_t
dahdi_device_span_count_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dahdi_device *ddev = to_ddev(dev);
unsigned int count = 0;
struct list_head *pos;
list_for_each(pos, &ddev->spans)
++count;
return sprintf(buf, "%d\n", count);
}
static ssize_t
dahdi_device_hardware_id_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dahdi_device *ddev = to_ddev(dev);
return sprintf(buf, "%s\n",
(ddev->hardware_id) ? ddev->hardware_id : "");
}
static ssize_t
dahdi_device_location_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dahdi_device *ddev = to_ddev(dev);
return sprintf(buf, "%s\n",
(ddev->location) ? ddev->location : "");
}
static ssize_t
dahdi_device_auto_assign(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct dahdi_device *ddev = to_ddev(dev);
dahdi_assign_device_spans(ddev);
return count;
}
static ssize_t
dahdi_device_assign_span(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
struct dahdi_span *span;
unsigned int local_span_number;
unsigned int desired_spanno;
unsigned int desired_basechanno;
struct dahdi_device *const ddev = to_ddev(dev);
ret = sscanf(buf, "%u:%u:%u", &local_span_number, &desired_spanno,
&desired_basechanno);
if (ret != 3) {
dev_notice(dev, "bad input (should be <num>:<num>:<num>)\n");
return -EINVAL;
}
if (desired_spanno && !desired_basechanno) {
dev_notice(dev, "Must set span number AND base chan number\n");
return -EINVAL;
}
list_for_each_entry(span, &ddev->spans, device_node) {
if (local_span_number == local_spanno(span)) {
ret = dahdi_assign_span(span, desired_spanno,
desired_basechanno, 1);
return (ret) ? ret : count;
}
}
dev_notice(dev, "no match for local span number %d\n",
local_span_number);
return -EINVAL;
}
static ssize_t
dahdi_device_unassign_span(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
int ret;
unsigned int local_span_number;
struct dahdi_span *span;
struct dahdi_device *const ddev = to_ddev(dev);
ret = sscanf(buf, "%u", &local_span_number);
if (ret != 1)
return -EINVAL;
ret = -ENODEV;
list_for_each_entry(span, &ddev->spans, device_node) {
if (local_span_number == local_spanno(span))
ret = dahdi_unassign_span(span);
}
if (-ENODEV == ret) {
if (printk_ratelimit()) {
dev_info(dev, "'%d' is an invalid local span number.\n",
local_span_number);
}
return -EINVAL;
}
return (ret < 0) ? ret : count;
}
static ssize_t
dahdi_spantype_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dahdi_device *ddev = to_ddev(dev);
int count = 0;
ssize_t total = 0;
struct dahdi_span *span;
/* TODO: Make sure this doesn't overflow the page. */
list_for_each_entry(span, &ddev->spans, device_node) {
count = sprintf(buf, "%d:%s\n",
local_spanno(span), dahdi_spantype2str(span->spantype));
buf += count;
total += count;
}
return total;
}
static ssize_t
dahdi_spantype_store(struct device *dev, struct device_attribute *attr,
const char *buf, size_t count)
{
struct dahdi_device *const ddev = to_ddev(dev);
int ret;
struct dahdi_span *span = NULL;
struct dahdi_span *cur;
unsigned int local_span_number;
char spantype_name[80];
enum spantypes spantype;
ret = sscanf(buf, "%u:%70s", &local_span_number, spantype_name);
if (ret != 2) {
dev_err(&ddev->dev, "Wrong input format: '%s'\n", buf);
return -EINVAL;
}
spantype = dahdi_str2spantype(spantype_name);
if (spantype == SPANTYPE_INVALID) {
dev_err(&ddev->dev, "Invalid spantype: '%s'\n", buf);
return -EINVAL;
}
list_for_each_entry(cur, &ddev->spans, device_node) {
if (local_spanno(cur) == local_span_number) {
span = cur;
break;
}
}
if (!span || (local_spanno(span) != local_span_number)) {
module_printk(KERN_WARNING,
"%d is not a valid local span number "
"for this device.\n", local_span_number);
return -EINVAL;
}
if (test_bit(DAHDI_FLAGBIT_REGISTERED, &span->flags)) {
module_printk(KERN_WARNING, "Span %s is already assigned.\n",
span->name);
return -EINVAL;
}
if (!span->ops->set_spantype) {
module_printk(KERN_WARNING, "Span %s does not support "
"setting type.\n", span->name);
return -EINVAL;
}
ret = span->ops->set_spantype(span, spantype);
return (ret < 0) ? ret : count;
}
static ssize_t
dahdi_registration_time_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
struct dahdi_device *ddev = to_ddev(dev);
int count = 0;
count += sprintf(buf, "%010ld.%09ld\n",
ddev->registration_time.tv_sec,
ddev->registration_time.tv_nsec);
return count;
}
static struct device_attribute dahdi_device_attrs[] = {
__ATTR(manufacturer, S_IRUGO, dahdi_device_manufacturer_show, NULL),
__ATTR(type, S_IRUGO, dahdi_device_type_show, NULL),
__ATTR(span_count, S_IRUGO, dahdi_device_span_count_show, NULL),
__ATTR(hardware_id, S_IRUGO, dahdi_device_hardware_id_show, NULL),
__ATTR(location, S_IRUGO, dahdi_device_location_show, NULL),
__ATTR(auto_assign, S_IWUSR, NULL, dahdi_device_auto_assign),
__ATTR(assign_span, S_IWUSR, NULL, dahdi_device_assign_span),
__ATTR(unassign_span, S_IWUSR, NULL, dahdi_device_unassign_span),
__ATTR(spantype, S_IWUSR | S_IRUGO, dahdi_spantype_show,
dahdi_spantype_store),
__ATTR(registration_time, S_IRUGO, dahdi_registration_time_show, NULL),
__ATTR_NULL,
};
static struct bus_type dahdi_device_bus = {
.name = "dahdi_devices",
.uevent = device_uevent,
.dev_attrs = dahdi_device_attrs,
};
static void dahdi_sysfs_cleanup(void)
{
dahdi_dbg(DEVICES, "SYSFS\n");
if (should_cleanup.clean_dahdi_driver) {
dahdi_dbg(DEVICES, "Unregister driver\n");
driver_unregister(&dahdi_driver);
should_cleanup.clean_dahdi_driver = 0;
}
if (should_cleanup.clean_span_bus_type) {
dahdi_dbg(DEVICES, "Unregister span bus type\n");
bus_unregister(&spans_bus_type);
should_cleanup.clean_span_bus_type = 0;
}
dahdi_sysfs_chan_exit();
if (should_cleanup.clean_chardev) {
dahdi_dbg(DEVICES, "Unregister character device\n");
unregister_chrdev(DAHDI_MAJOR, "dahdi");
should_cleanup.clean_chardev = 0;
}
if (should_cleanup.clean_device_bus) {
dahdi_dbg(DEVICES, "Unregister DAHDI device bus\n");
bus_unregister(&dahdi_device_bus);
should_cleanup.clean_device_bus = 0;
}
}
static void dahdi_device_release(struct device *dev)
{
struct dahdi_device *ddev = container_of(dev, struct dahdi_device, dev);
kfree(ddev);
}
/**
* dahdi_sysfs_add_device - Add the dahdi_device into the sysfs hierarchy.
* @ddev: The device to add.
* @parent: The physical device that is implementing this device.
*
* By adding the dahdi_device to the sysfs hierarchy user space can control
* how spans are numbered.
*
*/
int dahdi_sysfs_add_device(struct dahdi_device *ddev, struct device *parent)
{
int ret;
struct device *const dev = &ddev->dev;
const char *dn;
dev->parent = parent;
dev->bus = &dahdi_device_bus;
dn = dev_name(dev);
if (!dn || !*dn) {
/* Invent default name based on parent */
if (!parent)
return -EINVAL;
dev_set_name(dev, "%s:%s", parent->bus->name, dev_name(parent));
}
ret = device_add(dev);
return ret;
}
void dahdi_sysfs_init_device(struct dahdi_device *ddev)
{
device_initialize(&ddev->dev);
ddev->dev.release = dahdi_device_release;
}
void dahdi_sysfs_unregister_device(struct dahdi_device *ddev)
{
device_del(&ddev->dev);
}
int __init dahdi_sysfs_init(const struct file_operations *dahdi_fops)
{
int res = 0;
dahdi_dbg(DEVICES, "Registering DAHDI device bus\n");
/* Handle dahdi-tools paths (for udev environment) */
if (tools_rootdir && initdir) {
dahdi_err("Cannot use tools-rootdir and initdir parameters simultaneously\n");
return -EINVAL;
}
if (initdir)
pr_notice("dahdi: initdir is depracated -- prefer using \"tools_rootdir\" parameter\n");
else
initdir = "/usr/share/dahdi";
if (!tools_rootdir)
tools_rootdir = "";
res = bus_register(&dahdi_device_bus);
if (res)
return res;
should_cleanup.clean_device_bus = 1;
dahdi_dbg(DEVICES,
"Registering character device (major=%d)\n", DAHDI_MAJOR);
res = register_chrdev(DAHDI_MAJOR, "dahdi", dahdi_fops);
if (res) {
module_printk(KERN_ERR,
"Unable to register DAHDI character device "
"handler on %d\n", DAHDI_MAJOR);
return res;
}
should_cleanup.clean_chardev = 1;
res = dahdi_sysfs_chan_init(dahdi_fops);
if (res)
goto cleanup;
res = bus_register(&spans_bus_type);
if (res) {
dahdi_err("%s: bus_register(%s) failed. Error number %d",
__func__, spans_bus_type.name, res);
goto cleanup;
}
should_cleanup.clean_span_bus_type = 1;
res = driver_register(&dahdi_driver);
if (res) {
dahdi_err("%s: driver_register(%s) failed. Error number %d",
__func__, dahdi_driver.name, res);
goto cleanup;
}
should_cleanup.clean_dahdi_driver = 1;
module_printk(KERN_INFO, "Telephony Interface Registered on major %d\n",
DAHDI_MAJOR);
return 0;
cleanup:
dahdi_sysfs_cleanup();
return res;
}
void dahdi_sysfs_exit(void)
{
dahdi_sysfs_cleanup();
}
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