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#include <linux/cdev.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/list.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/tapi/tapi.h>
#include <linux/tapi/tapi-ioctl.h>
/* FIXME Does it acutally make sense to allow more then one application at a
* time to open the control device? For example calling sync from one app will
* also sync all others. */
struct tapi_control_file {
struct tapi_device *tdev;
struct list_head links;
};
static struct tapi_endpoint *tapi_lookup_endpoint(struct tapi_device *tdev,
unsigned int ep_id)
{
struct tapi_stream *stream;
if (ep_id < tdev->num_ports)
return &tdev->ports[ep_id].ep;
list_for_each_entry(stream, &tdev->streams, head) {
if (stream->ep.id == ep_id)
return &stream->ep;
}
return ERR_PTR(-ENOENT);
}
static inline struct tapi_device *inode_to_tdev(struct inode *inode)
{
return container_of(inode->i_cdev, struct tapi_char_device, cdev)->tdev;
}
static int tapi_control_open(struct inode *inode, struct file *file)
{
int ret;
struct tapi_device *tdev = inode_to_tdev(inode);
struct tapi_control_file *tctrl;
get_device(&tdev->dev);
tctrl = kzalloc(sizeof(*tctrl), GFP_KERNEL);
if (!tctrl) {
ret = -ENOMEM;
goto err_put_device;
}
INIT_LIST_HEAD(&tctrl->links);
tctrl->tdev = tdev;
file->private_data = tctrl;
return 0;
err_put_device:
put_device(&tdev->dev);
return ret;
}
static int tapi_control_release(struct inode *inode, struct file *file)
{
struct tapi_control_file *tctrl = file->private_data;
struct tapi_link *link;
if (tctrl) {
list_for_each_entry(link, &tctrl->links, head)
tapi_link_free(tctrl->tdev, link);
put_device(&tctrl->tdev->dev);
}
return 0;
}
static long tapi_control_ioctl_link_alloc(struct tapi_control_file *tctrl,
unsigned long arg)
{
struct tapi_link *link;
struct tapi_endpoint *ep1, *ep2;
ep1 = tapi_lookup_endpoint(tctrl->tdev, arg >> 16);
ep2 = tapi_lookup_endpoint(tctrl->tdev, arg & 0xffff);
link = tapi_link_alloc(tctrl->tdev, ep1, ep2);
if (IS_ERR(link))
return PTR_ERR(link);
list_add_tail(&link->head, &tctrl->links);
return link->id;
}
struct tapi_link *tapi_control_lookup_link(struct tapi_control_file *tctrl,
unsigned int id)
{
struct tapi_link *link;
list_for_each_entry(link, &tctrl->links, head) {
if (link->id == id)
return link;
}
return NULL;
}
static long tapi_control_ioctl_link_free(struct tapi_control_file *tctrl,
unsigned long arg)
{
struct tapi_link *link = tapi_control_lookup_link(tctrl, arg);
if (!link)
return -ENOENT;
tapi_link_free(tctrl->tdev, link);
list_del(&link->head);
return 0;
}
static long tapi_control_ioctl_link_enable(struct tapi_control_file *tctrl,
unsigned long arg)
{
struct tapi_link *link = tapi_control_lookup_link(tctrl, arg);
if (!link)
return -ENOENT;
return tapi_link_enable(tctrl->tdev, link);
}
static long tapi_control_ioctl_link_disable(struct tapi_control_file *tctrl,
unsigned long arg)
{
struct tapi_link *link = tapi_control_lookup_link(tctrl, arg);
if (!link)
return -ENOENT;
return tapi_link_disable(tctrl->tdev, link);
}
static long tapi_control_ioctl_sync(struct tapi_control_file *tctrl)
{
return tapi_sync(tctrl->tdev);
}
static long tapi_control_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
int ret;
struct tapi_control_file *tctrl = file->private_data;
switch (cmd) {
case TAPI_CONTROL_IOCTL_LINK_ALLOC:
ret = tapi_control_ioctl_link_alloc(tctrl, arg);
break;
case TAPI_CONTROL_IOCTL_LINK_FREE:
ret = tapi_control_ioctl_link_free(tctrl, arg);
break;
case TAPI_CONTROL_IOCTL_LINK_ENABLE:
ret = tapi_control_ioctl_link_enable(tctrl, arg);
break;
case TAPI_CONTROL_IOCTL_LINK_DISABLE:
ret = tapi_control_ioctl_link_disable(tctrl, arg);
break;
case TAPI_CONTROL_IOCTL_SYNC:
ret = tapi_control_ioctl_sync(tctrl);
break;
default:
return -EINVAL;
}
return ret;
}
static const struct file_operations tapi_control_file_ops = {
.owner = THIS_MODULE,
.open = tapi_control_open,
.release = tapi_control_release,
.unlocked_ioctl = tapi_control_ioctl,
};
int tapi_register_control_device(struct tapi_device* tdev)
{
dev_set_name(&tdev->control_dev.dev, "tapi%uC", tdev->id);
return tapi_char_device_register(tdev, &tdev->control_dev, &tapi_control_file_ops);
}
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