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path: root/drivers/connector/connector.c
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Diffstat (limited to 'drivers/connector/connector.c')
-rw-r--r--drivers/connector/connector.c197
1 files changed, 8 insertions, 189 deletions
diff --git a/drivers/connector/connector.c b/drivers/connector/connector.c
index 08b2500f21ec..537c29ac4487 100644
--- a/drivers/connector/connector.c
+++ b/drivers/connector/connector.c
@@ -36,17 +36,6 @@ MODULE_LICENSE("GPL");
MODULE_AUTHOR("Evgeniy Polyakov <zbr@ioremap.net>");
MODULE_DESCRIPTION("Generic userspace <-> kernelspace connector.");
-static u32 cn_idx = CN_IDX_CONNECTOR;
-static u32 cn_val = CN_VAL_CONNECTOR;
-
-module_param(cn_idx, uint, 0);
-module_param(cn_val, uint, 0);
-MODULE_PARM_DESC(cn_idx, "Connector's main device idx.");
-MODULE_PARM_DESC(cn_val, "Connector's main device val.");
-
-static DEFINE_MUTEX(notify_lock);
-static LIST_HEAD(notify_list);
-
static struct cn_dev cdev;
static int cn_already_initialized;
@@ -129,21 +118,19 @@ EXPORT_SYMBOL_GPL(cn_netlink_send);
/*
* Callback helper - queues work and setup destructor for given data.
*/
-static int cn_call_callback(struct cn_msg *msg, void (*destruct_data)(void *), void *data)
+static int cn_call_callback(struct sk_buff *skb)
{
struct cn_callback_entry *__cbq, *__new_cbq;
struct cn_dev *dev = &cdev;
+ struct cn_msg *msg = NLMSG_DATA(nlmsg_hdr(skb));
int err = -ENODEV;
spin_lock_bh(&dev->cbdev->queue_lock);
list_for_each_entry(__cbq, &dev->cbdev->queue_list, callback_entry) {
if (cn_cb_equal(&__cbq->id.id, &msg->id)) {
if (likely(!work_pending(&__cbq->work) &&
- __cbq->data.ddata == NULL)) {
- __cbq->data.callback_priv = msg;
-
- __cbq->data.ddata = data;
- __cbq->data.destruct_data = destruct_data;
+ __cbq->data.skb == NULL)) {
+ __cbq->data.skb = skb;
if (queue_cn_work(__cbq, &__cbq->work))
err = 0;
@@ -156,10 +143,8 @@ static int cn_call_callback(struct cn_msg *msg, void (*destruct_data)(void *), v
__new_cbq = kzalloc(sizeof(struct cn_callback_entry), GFP_ATOMIC);
if (__new_cbq) {
d = &__new_cbq->data;
- d->callback_priv = msg;
+ d->skb = skb;
d->callback = __cbq->data.callback;
- d->ddata = data;
- d->destruct_data = destruct_data;
d->free = __new_cbq;
__new_cbq->pdev = __cbq->pdev;
@@ -191,7 +176,6 @@ static int cn_call_callback(struct cn_msg *msg, void (*destruct_data)(void *), v
*/
static void cn_rx_skb(struct sk_buff *__skb)
{
- struct cn_msg *msg;
struct nlmsghdr *nlh;
int err;
struct sk_buff *skb;
@@ -208,68 +192,20 @@ static void cn_rx_skb(struct sk_buff *__skb)
return;
}
- msg = NLMSG_DATA(nlh);
- err = cn_call_callback(msg, (void (*)(void *))kfree_skb, skb);
+ err = cn_call_callback(skb);
if (err < 0)
kfree_skb(skb);
}
}
/*
- * Notification routing.
- *
- * Gets id and checks if there are notification request for it's idx
- * and val. If there are such requests notify the listeners with the
- * given notify event.
- *
- */
-static void cn_notify(struct cb_id *id, u32 notify_event)
-{
- struct cn_ctl_entry *ent;
-
- mutex_lock(&notify_lock);
- list_for_each_entry(ent, &notify_list, notify_entry) {
- int i;
- struct cn_notify_req *req;
- struct cn_ctl_msg *ctl = ent->msg;
- int idx_found, val_found;
-
- idx_found = val_found = 0;
-
- req = (struct cn_notify_req *)ctl->data;
- for (i = 0; i < ctl->idx_notify_num; ++i, ++req) {
- if (id->idx >= req->first &&
- id->idx < req->first + req->range) {
- idx_found = 1;
- break;
- }
- }
-
- for (i = 0; i < ctl->val_notify_num; ++i, ++req) {
- if (id->val >= req->first &&
- id->val < req->first + req->range) {
- val_found = 1;
- break;
- }
- }
-
- if (idx_found && val_found) {
- struct cn_msg m = { .ack = notify_event, };
-
- memcpy(&m.id, id, sizeof(m.id));
- cn_netlink_send(&m, ctl->group, GFP_KERNEL);
- }
- }
- mutex_unlock(&notify_lock);
-}
-
-/*
* Callback add routing - adds callback with given ID and name.
* If there is registered callback with the same ID it will not be added.
*
* May sleep.
*/
-int cn_add_callback(struct cb_id *id, char *name, void (*callback)(void *))
+int cn_add_callback(struct cb_id *id, char *name,
+ void (*callback)(struct cn_msg *, struct netlink_skb_parms *))
{
int err;
struct cn_dev *dev = &cdev;
@@ -281,8 +217,6 @@ int cn_add_callback(struct cb_id *id, char *name, void (*callback)(void *))
if (err)
return err;
- cn_notify(id, 0);
-
return 0;
}
EXPORT_SYMBOL_GPL(cn_add_callback);
@@ -300,112 +234,9 @@ void cn_del_callback(struct cb_id *id)
struct cn_dev *dev = &cdev;
cn_queue_del_callback(dev->cbdev, id);
- cn_notify(id, 1);
}
EXPORT_SYMBOL_GPL(cn_del_callback);
-/*
- * Checks two connector's control messages to be the same.
- * Returns 1 if they are the same or if the first one is corrupted.
- */
-static int cn_ctl_msg_equals(struct cn_ctl_msg *m1, struct cn_ctl_msg *m2)
-{
- int i;
- struct cn_notify_req *req1, *req2;
-
- if (m1->idx_notify_num != m2->idx_notify_num)
- return 0;
-
- if (m1->val_notify_num != m2->val_notify_num)
- return 0;
-
- if (m1->len != m2->len)
- return 0;
-
- if ((m1->idx_notify_num + m1->val_notify_num) * sizeof(*req1) !=
- m1->len)
- return 1;
-
- req1 = (struct cn_notify_req *)m1->data;
- req2 = (struct cn_notify_req *)m2->data;
-
- for (i = 0; i < m1->idx_notify_num; ++i) {
- if (req1->first != req2->first || req1->range != req2->range)
- return 0;
- req1++;
- req2++;
- }
-
- for (i = 0; i < m1->val_notify_num; ++i) {
- if (req1->first != req2->first || req1->range != req2->range)
- return 0;
- req1++;
- req2++;
- }
-
- return 1;
-}
-
-/*
- * Main connector device's callback.
- *
- * Used for notification of a request's processing.
- */
-static void cn_callback(void *data)
-{
- struct cn_msg *msg = data;
- struct cn_ctl_msg *ctl;
- struct cn_ctl_entry *ent;
- u32 size;
-
- if (msg->len < sizeof(*ctl))
- return;
-
- ctl = (struct cn_ctl_msg *)msg->data;
-
- size = (sizeof(*ctl) + ((ctl->idx_notify_num +
- ctl->val_notify_num) *
- sizeof(struct cn_notify_req)));
-
- if (msg->len != size)
- return;
-
- if (ctl->len + sizeof(*ctl) != msg->len)
- return;
-
- /*
- * Remove notification.
- */
- if (ctl->group == 0) {
- struct cn_ctl_entry *n;
-
- mutex_lock(&notify_lock);
- list_for_each_entry_safe(ent, n, &notify_list, notify_entry) {
- if (cn_ctl_msg_equals(ent->msg, ctl)) {
- list_del(&ent->notify_entry);
- kfree(ent);
- }
- }
- mutex_unlock(&notify_lock);
-
- return;
- }
-
- size += sizeof(*ent);
-
- ent = kzalloc(size, GFP_KERNEL);
- if (!ent)
- return;
-
- ent->msg = (struct cn_ctl_msg *)(ent + 1);
-
- memcpy(ent->msg, ctl, size - sizeof(*ent));
-
- mutex_lock(&notify_lock);
- list_add(&ent->notify_entry, &notify_list);
- mutex_unlock(&notify_lock);
-}
-
static int cn_proc_show(struct seq_file *m, void *v)
{
struct cn_queue_dev *dev = cdev.cbdev;
@@ -443,11 +274,8 @@ static const struct file_operations cn_file_ops = {
static int __devinit cn_init(void)
{
struct cn_dev *dev = &cdev;
- int err;
dev->input = cn_rx_skb;
- dev->id.idx = cn_idx;
- dev->id.val = cn_val;
dev->nls = netlink_kernel_create(&init_net, NETLINK_CONNECTOR,
CN_NETLINK_USERS + 0xf,
@@ -463,14 +291,6 @@ static int __devinit cn_init(void)
cn_already_initialized = 1;
- err = cn_add_callback(&dev->id, "connector", &cn_callback);
- if (err) {
- cn_already_initialized = 0;
- cn_queue_free_dev(dev->cbdev);
- netlink_kernel_release(dev->nls);
- return -EINVAL;
- }
-
proc_net_fops_create(&init_net, "connector", S_IRUGO, &cn_file_ops);
return 0;
@@ -484,7 +304,6 @@ static void __devexit cn_fini(void)
proc_net_remove(&init_net, "connector");
- cn_del_callback(&dev->id);
cn_queue_free_dev(dev->cbdev);
netlink_kernel_release(dev->nls);
}
generated by cgit v1.2.3 (git 2.0.4) at 2024-12-26 05:50:54 +0000