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Bluetooth: Add support creating virtual AMP controllers

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So far the only option to create a virtual AMP controller was by
setting a module parameter for the hci_vhci driver. This patch adds
the functionality to define inline to create either a BR/EDR or an
AMP controller.

In addition the client will be informed which HCI controller index
it got assigned. That is especially useful for automated end-to-end
testing.

To keep backwards compatibility with existing userspace, the command
for creating a controller type needs to be send right after opening
the device node. If the command is not send, it defaults back to
automatically creating a BR/EDR controller.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
This commit is contained in:
Marcel Holtmann 2013-09-02 10:41:39 -07:00 committed by Gustavo Padovan
parent bfacbb9aec
commit 23424c0d31
1 changed files with 123 additions and 46 deletions
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169
drivers/bluetooth/hci_vhci.c
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@ -24,6 +24,7 @@
*/
#include <linux/module.h>
#include <asm/unaligned.h>
#include <linux/kernel.h>
#include <linux/init.h>
@ -39,17 +40,17 @@
#include <net/bluetooth/bluetooth.h>
#include <net/bluetooth/hci_core.h>
#define VERSION "1.3"
#define VERSION "1.4"
static bool amp;
struct vhci_data {
struct hci_dev *hdev;
unsigned long flags;
wait_queue_head_t read_wait;
struct sk_buff_head readq;
struct delayed_work open_timeout;
};
static int vhci_open_dev(struct hci_dev *hdev)
@ -99,16 +100,62 @@ static int vhci_send_frame(struct sk_buff *skb)
skb_queue_tail(&data->readq, skb);
wake_up_interruptible(&data->read_wait);
return 0;
}
static int vhci_create_device(struct vhci_data *data, __u8 dev_type)
{
struct hci_dev *hdev;
struct sk_buff *skb;
skb = bt_skb_alloc(4, GFP_KERNEL);
if (!skb)
return -ENOMEM;
hdev = hci_alloc_dev();
if (!hdev) {
kfree_skb(skb);
return -ENOMEM;
}
data->hdev = hdev;
hdev->bus = HCI_VIRTUAL;
hdev->dev_type = dev_type;
hci_set_drvdata(hdev, data);
hdev->open = vhci_open_dev;
hdev->close = vhci_close_dev;
hdev->flush = vhci_flush;
hdev->send = vhci_send_frame;
if (hci_register_dev(hdev) < 0) {
BT_ERR("Can't register HCI device");
hci_free_dev(hdev);
data->hdev = NULL;
kfree_skb(skb);
return -EBUSY;
}
bt_cb(skb)->pkt_type = HCI_VENDOR_PKT;
*skb_put(skb, 1) = 0xff;
*skb_put(skb, 1) = dev_type;
put_unaligned_le16(hdev->id, skb_put(skb, 2));
skb_queue_tail(&data->readq, skb);
wake_up_interruptible(&data->read_wait);
return 0;
}
static inline ssize_t vhci_get_user(struct vhci_data *data,
const char __user *buf, size_t count)
const char __user *buf, size_t count)
{
struct sk_buff *skb;
__u8 pkt_type, dev_type;
int ret;
if (count > HCI_MAX_FRAME_SIZE)
if (count < 2 || count > HCI_MAX_FRAME_SIZE)
return -EINVAL;
skb = bt_skb_alloc(count, GFP_KERNEL);
@ -120,27 +167,70 @@ static inline ssize_t vhci_get_user(struct vhci_data *data,
return -EFAULT;
}
skb->dev = (void *) data->hdev;
bt_cb(skb)->pkt_type = *((__u8 *) skb->data);
pkt_type = *((__u8 *) skb->data);
skb_pull(skb, 1);
hci_recv_frame(skb);
switch (pkt_type) {
case HCI_EVENT_PKT:
case HCI_ACLDATA_PKT:
case HCI_SCODATA_PKT:
if (!data->hdev) {
kfree_skb(skb);
return -ENODEV;
}
return count;
skb->dev = (void *) data->hdev;
bt_cb(skb)->pkt_type = pkt_type;
ret = hci_recv_frame(skb);
break;
case HCI_VENDOR_PKT:
if (data->hdev) {
kfree_skb(skb);
return -EBADFD;
}
cancel_delayed_work_sync(&data->open_timeout);
dev_type = *((__u8 *) skb->data);
skb_pull(skb, 1);
if (skb->len > 0) {
kfree_skb(skb);
return -EINVAL;
}
kfree_skb(skb);
if (dev_type != HCI_BREDR && dev_type != HCI_AMP)
return -EINVAL;
ret = vhci_create_device(data, dev_type);
break;
default:
kfree_skb(skb);
return -EINVAL;
}
return (ret < 0) ? ret : count;
}
static inline ssize_t vhci_put_user(struct vhci_data *data,
struct sk_buff *skb, char __user *buf, int count)
struct sk_buff *skb,
char __user *buf, int count)
{
char __user *ptr = buf;
int len, total = 0;
int len;
len = min_t(unsigned int, skb->len, count);
if (copy_to_user(ptr, skb->data, len))
return -EFAULT;
total += len;
if (!data->hdev)
return len;
data->hdev->stat.byte_tx += len;
@ -148,21 +238,19 @@ static inline ssize_t vhci_put_user(struct vhci_data *data,
case HCI_COMMAND_PKT:
data->hdev->stat.cmd_tx++;
break;
case HCI_ACLDATA_PKT:
data->hdev->stat.acl_tx++;
break;
case HCI_SCODATA_PKT:
data->hdev->stat.sco_tx++;
break;
}
return total;
return len;
}
static ssize_t vhci_read(struct file *file,
char __user *buf, size_t count, loff_t *pos)
char __user *buf, size_t count, loff_t *pos)
{
struct vhci_data *data = file->private_data;
struct sk_buff *skb;
@ -185,7 +273,7 @@ static ssize_t vhci_read(struct file *file,
}
ret = wait_event_interruptible(data->read_wait,
!skb_queue_empty(&data->readq));
!skb_queue_empty(&data->readq));
if (ret < 0)
break;
}
@ -194,7 +282,7 @@ static ssize_t vhci_read(struct file *file,
}
static ssize_t vhci_write(struct file *file,
const char __user *buf, size_t count, loff_t *pos)
const char __user *buf, size_t count, loff_t *pos)
{
struct vhci_data *data = file->private_data;
@ -213,10 +301,17 @@ static unsigned int vhci_poll(struct file *file, poll_table *wait)
return POLLOUT | POLLWRNORM;
}
static void vhci_open_timeout(struct work_struct *work)
{
struct vhci_data *data = container_of(work, struct vhci_data,
open_timeout.work);
vhci_create_device(data, amp ? HCI_AMP : HCI_BREDR);
}
static int vhci_open(struct inode *inode, struct file *file)
{
struct vhci_data *data;
struct hci_dev *hdev;
data = kzalloc(sizeof(struct vhci_data), GFP_KERNEL);
if (!data)
@ -225,35 +320,13 @@ static int vhci_open(struct inode *inode, struct file *file)
skb_queue_head_init(&data->readq);
init_waitqueue_head(&data->read_wait);
hdev = hci_alloc_dev();
if (!hdev) {
kfree(data);
return -ENOMEM;
}
data->hdev = hdev;
hdev->bus = HCI_VIRTUAL;
hci_set_drvdata(hdev, data);
if (amp)
hdev->dev_type = HCI_AMP;
hdev->open = vhci_open_dev;
hdev->close = vhci_close_dev;
hdev->flush = vhci_flush;
hdev->send = vhci_send_frame;
if (hci_register_dev(hdev) < 0) {
BT_ERR("Can't register HCI device");
kfree(data);
hci_free_dev(hdev);
return -EBUSY;
}
INIT_DELAYED_WORK(&data->open_timeout, vhci_open_timeout);
file->private_data = data;
nonseekable_open(inode, file);
schedule_delayed_work(&data->open_timeout, msecs_to_jiffies(1000));
return 0;
}
@ -262,8 +335,12 @@ static int vhci_release(struct inode *inode, struct file *file)
struct vhci_data *data = file->private_data;
struct hci_dev *hdev = data->hdev;
hci_unregister_dev(hdev);
hci_free_dev(hdev);
cancel_delayed_work_sync(&data->open_timeout);
if (hdev) {
hci_unregister_dev(hdev);
hci_free_dev(hdev);
}
file->private_data = NULL;
kfree(data);