421 lines
8.4 KiB
C
421 lines
8.4 KiB
C
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// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright 2008 by Karsten Keil <kkeil@novell.com>
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*/
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/stddef.h>
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#include <linux/module.h>
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#include <linux/spinlock.h>
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#include <linux/mISDNif.h>
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#include "core.h"
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static u_int debug;
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MODULE_AUTHOR("Karsten Keil");
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MODULE_LICENSE("GPL");
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module_param(debug, uint, S_IRUGO | S_IWUSR);
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static u64 device_ids;
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#define MAX_DEVICE_ID 63
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static LIST_HEAD(Bprotocols);
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static DEFINE_RWLOCK(bp_lock);
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static void mISDN_dev_release(struct device *dev)
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{
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/* nothing to do: the device is part of its parent's data structure */
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}
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static ssize_t id_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mISDNdevice *mdev = dev_to_mISDN(dev);
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if (!mdev)
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return -ENODEV;
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return sprintf(buf, "%d\n", mdev->id);
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}
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static DEVICE_ATTR_RO(id);
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static ssize_t nrbchan_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mISDNdevice *mdev = dev_to_mISDN(dev);
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if (!mdev)
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return -ENODEV;
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return sprintf(buf, "%d\n", mdev->nrbchan);
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}
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static DEVICE_ATTR_RO(nrbchan);
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static ssize_t d_protocols_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mISDNdevice *mdev = dev_to_mISDN(dev);
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if (!mdev)
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return -ENODEV;
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return sprintf(buf, "%d\n", mdev->Dprotocols);
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}
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static DEVICE_ATTR_RO(d_protocols);
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static ssize_t b_protocols_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mISDNdevice *mdev = dev_to_mISDN(dev);
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if (!mdev)
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return -ENODEV;
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return sprintf(buf, "%d\n", mdev->Bprotocols | get_all_Bprotocols());
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}
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static DEVICE_ATTR_RO(b_protocols);
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static ssize_t protocol_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mISDNdevice *mdev = dev_to_mISDN(dev);
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if (!mdev)
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return -ENODEV;
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return sprintf(buf, "%d\n", mdev->D.protocol);
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}
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static DEVICE_ATTR_RO(protocol);
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static ssize_t name_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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strcpy(buf, dev_name(dev));
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return strlen(buf);
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}
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static DEVICE_ATTR_RO(name);
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#if 0 /* hangs */
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static ssize_t name_set(struct device *dev, struct device_attribute *attr,
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const char *buf, size_t count)
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{
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int err = 0;
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char *out = kmalloc(count + 1, GFP_KERNEL);
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if (!out)
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return -ENOMEM;
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memcpy(out, buf, count);
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if (count && out[count - 1] == '\n')
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out[--count] = 0;
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if (count)
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err = device_rename(dev, out);
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kfree(out);
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return (err < 0) ? err : count;
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}
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static DEVICE_ATTR_RW(name);
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#endif
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static ssize_t channelmap_show(struct device *dev,
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struct device_attribute *attr, char *buf)
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{
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struct mISDNdevice *mdev = dev_to_mISDN(dev);
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char *bp = buf;
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int i;
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for (i = 0; i <= mdev->nrbchan; i++)
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*bp++ = test_channelmap(i, mdev->channelmap) ? '1' : '0';
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return bp - buf;
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}
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static DEVICE_ATTR_RO(channelmap);
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static struct attribute *mISDN_attrs[] = {
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&dev_attr_id.attr,
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&dev_attr_d_protocols.attr,
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&dev_attr_b_protocols.attr,
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&dev_attr_protocol.attr,
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&dev_attr_channelmap.attr,
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&dev_attr_nrbchan.attr,
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&dev_attr_name.attr,
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NULL,
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};
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ATTRIBUTE_GROUPS(mISDN);
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static int mISDN_uevent(struct device *dev, struct kobj_uevent_env *env)
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{
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struct mISDNdevice *mdev = dev_to_mISDN(dev);
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if (!mdev)
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return 0;
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if (add_uevent_var(env, "nchans=%d", mdev->nrbchan))
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return -ENOMEM;
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return 0;
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}
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static void mISDN_class_release(struct class *cls)
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{
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/* do nothing, it's static */
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}
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static struct class mISDN_class = {
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.name = "mISDN",
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.owner = THIS_MODULE,
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.dev_uevent = mISDN_uevent,
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.dev_groups = mISDN_groups,
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.dev_release = mISDN_dev_release,
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.class_release = mISDN_class_release,
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};
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static int
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_get_mdevice(struct device *dev, const void *id)
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{
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struct mISDNdevice *mdev = dev_to_mISDN(dev);
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if (!mdev)
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return 0;
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if (mdev->id != *(const u_int *)id)
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return 0;
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return 1;
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}
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struct mISDNdevice
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*get_mdevice(u_int id)
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{
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return dev_to_mISDN(class_find_device(&mISDN_class, NULL, &id,
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_get_mdevice));
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}
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static int
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_get_mdevice_count(struct device *dev, void *cnt)
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{
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*(int *)cnt += 1;
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return 0;
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}
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int
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get_mdevice_count(void)
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{
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int cnt = 0;
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class_for_each_device(&mISDN_class, NULL, &cnt, _get_mdevice_count);
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return cnt;
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}
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static int
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get_free_devid(void)
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{
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u_int i;
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for (i = 0; i <= MAX_DEVICE_ID; i++)
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if (!test_and_set_bit(i, (u_long *)&device_ids))
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break;
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if (i > MAX_DEVICE_ID)
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return -EBUSY;
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return i;
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}
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int
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mISDN_register_device(struct mISDNdevice *dev,
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struct device *parent, char *name)
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{
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int err;
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err = get_free_devid();
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if (err < 0)
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return err;
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dev->id = err;
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device_initialize(&dev->dev);
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if (name && name[0])
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dev_set_name(&dev->dev, "%s", name);
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else
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dev_set_name(&dev->dev, "mISDN%d", dev->id);
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if (debug & DEBUG_CORE)
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printk(KERN_DEBUG "mISDN_register %s %d\n",
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dev_name(&dev->dev), dev->id);
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dev->dev.class = &mISDN_class;
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err = create_stack(dev);
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if (err)
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goto error1;
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dev->dev.platform_data = dev;
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dev->dev.parent = parent;
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dev_set_drvdata(&dev->dev, dev);
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err = device_add(&dev->dev);
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if (err)
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goto error3;
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return 0;
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error3:
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delete_stack(dev);
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error1:
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put_device(&dev->dev);
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return err;
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}
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EXPORT_SYMBOL(mISDN_register_device);
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void
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mISDN_unregister_device(struct mISDNdevice *dev) {
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if (debug & DEBUG_CORE)
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printk(KERN_DEBUG "mISDN_unregister %s %d\n",
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dev_name(&dev->dev), dev->id);
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/* sysfs_remove_link(&dev->dev.kobj, "device"); */
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device_del(&dev->dev);
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dev_set_drvdata(&dev->dev, NULL);
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test_and_clear_bit(dev->id, (u_long *)&device_ids);
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delete_stack(dev);
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put_device(&dev->dev);
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}
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EXPORT_SYMBOL(mISDN_unregister_device);
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u_int
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get_all_Bprotocols(void)
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{
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struct Bprotocol *bp;
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u_int m = 0;
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read_lock(&bp_lock);
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list_for_each_entry(bp, &Bprotocols, list)
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m |= bp->Bprotocols;
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read_unlock(&bp_lock);
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return m;
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}
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struct Bprotocol *
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get_Bprotocol4mask(u_int m)
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{
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struct Bprotocol *bp;
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read_lock(&bp_lock);
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list_for_each_entry(bp, &Bprotocols, list)
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if (bp->Bprotocols & m) {
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read_unlock(&bp_lock);
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return bp;
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}
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read_unlock(&bp_lock);
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return NULL;
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}
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struct Bprotocol *
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get_Bprotocol4id(u_int id)
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{
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u_int m;
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if (id < ISDN_P_B_START || id > 63) {
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printk(KERN_WARNING "%s id not in range %d\n",
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__func__, id);
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return NULL;
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}
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m = 1 << (id & ISDN_P_B_MASK);
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return get_Bprotocol4mask(m);
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}
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int
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mISDN_register_Bprotocol(struct Bprotocol *bp)
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{
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u_long flags;
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struct Bprotocol *old;
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if (debug & DEBUG_CORE)
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printk(KERN_DEBUG "%s: %s/%x\n", __func__,
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bp->name, bp->Bprotocols);
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old = get_Bprotocol4mask(bp->Bprotocols);
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if (old) {
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printk(KERN_WARNING
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"register duplicate protocol old %s/%x new %s/%x\n",
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old->name, old->Bprotocols, bp->name, bp->Bprotocols);
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return -EBUSY;
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}
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write_lock_irqsave(&bp_lock, flags);
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list_add_tail(&bp->list, &Bprotocols);
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write_unlock_irqrestore(&bp_lock, flags);
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return 0;
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}
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EXPORT_SYMBOL(mISDN_register_Bprotocol);
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void
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mISDN_unregister_Bprotocol(struct Bprotocol *bp)
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{
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u_long flags;
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if (debug & DEBUG_CORE)
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printk(KERN_DEBUG "%s: %s/%x\n", __func__, bp->name,
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bp->Bprotocols);
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write_lock_irqsave(&bp_lock, flags);
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list_del(&bp->list);
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write_unlock_irqrestore(&bp_lock, flags);
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}
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EXPORT_SYMBOL(mISDN_unregister_Bprotocol);
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static const char *msg_no_channel = "<no channel>";
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static const char *msg_no_stack = "<no stack>";
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static const char *msg_no_stackdev = "<no stack device>";
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const char *mISDNDevName4ch(struct mISDNchannel *ch)
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{
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if (!ch)
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return msg_no_channel;
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if (!ch->st)
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return msg_no_stack;
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if (!ch->st->dev)
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return msg_no_stackdev;
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return dev_name(&ch->st->dev->dev);
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};
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EXPORT_SYMBOL(mISDNDevName4ch);
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static int
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mISDNInit(void)
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{
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int err;
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printk(KERN_INFO "Modular ISDN core version %d.%d.%d\n",
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MISDN_MAJOR_VERSION, MISDN_MINOR_VERSION, MISDN_RELEASE);
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mISDN_init_clock(&debug);
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mISDN_initstack(&debug);
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err = class_register(&mISDN_class);
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if (err)
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goto error1;
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err = mISDN_inittimer(&debug);
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if (err)
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goto error2;
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err = Isdnl1_Init(&debug);
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if (err)
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goto error3;
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err = Isdnl2_Init(&debug);
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if (err)
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goto error4;
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err = misdn_sock_init(&debug);
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if (err)
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goto error5;
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||
|
|
return 0;
|
||
|
|
|
||
|
|
error5:
|
||
|
|
Isdnl2_cleanup();
|
||
|
|
error4:
|
||
|
|
Isdnl1_cleanup();
|
||
|
|
error3:
|
||
|
|
mISDN_timer_cleanup();
|
||
|
|
error2:
|
||
|
|
class_unregister(&mISDN_class);
|
||
|
|
error1:
|
||
|
|
return err;
|
||
|
|
}
|
||
|
|
|
||
|
|
static void mISDN_cleanup(void)
|
||
|
|
{
|
||
|
|
misdn_sock_cleanup();
|
||
|
|
Isdnl2_cleanup();
|
||
|
|
Isdnl1_cleanup();
|
||
|
|
mISDN_timer_cleanup();
|
||
|
|
class_unregister(&mISDN_class);
|
||
|
|
|
||
|
|
printk(KERN_DEBUG "mISDNcore unloaded\n");
|
||
|
|
}
|
||
|
|
|
||
|
|
module_init(mISDNInit);
|
||
|
|
module_exit(mISDN_cleanup);
|