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Bluetooth: Add delayed init sequence support for UART controllers

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This patch makes it possible to have UART drivers perform an internal
initialization before calling hci_register_dev. This allows moving a lot
of init code from user space (hciattach) to the kernel side, thereby
creating a more controlled/robust initialization process.

Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk>
This commit is contained in:
Johan Hedberg 2012-07-16 16:12:11 +03:00 committed by Gustavo Padovan
parent dac670b976
commit 9f2aee848f
2 changed files with 43 additions and 1 deletions
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39
drivers/bluetooth/hci_ldisc.c
View File

@ -156,6 +156,35 @@ restart:
return 0;
}
static void hci_uart_init_work(struct work_struct *work)
{
struct hci_uart *hu = container_of(work, struct hci_uart, init_ready);
int err;
if (!test_and_clear_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
return;
err = hci_register_dev(hu->hdev);
if (err < 0) {
BT_ERR("Can't register HCI device");
hci_free_dev(hu->hdev);
hu->hdev = NULL;
hu->proto->close(hu);
}
set_bit(HCI_UART_REGISTERED, &hu->flags);
}
int hci_uart_init_ready(struct hci_uart *hu)
{
if (!test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
return -EALREADY;
schedule_work(&hu->init_ready);
return 0;
}
/* ------- Interface to HCI layer ------ */
/* Initialize device */
static int hci_uart_open(struct hci_dev *hdev)
@ -264,6 +293,8 @@ static int hci_uart_tty_open(struct tty_struct *tty)
hu->tty = tty;
tty->receive_room = 65536;
INIT_WORK(&hu->init_ready, hci_uart_init_work);
spin_lock_init(&hu->rx_lock);
/* Flush any pending characters in the driver and line discipline. */
@ -302,7 +333,8 @@ static void hci_uart_tty_close(struct tty_struct *tty)
if (test_and_clear_bit(HCI_UART_PROTO_SET, &hu->flags)) {
if (hdev) {
hci_unregister_dev(hdev);
if (test_bit(HCI_UART_REGISTERED, &hu->flags))
hci_unregister_dev(hdev);
hci_free_dev(hdev);
}
hu->proto->close(hu);
@ -402,12 +434,17 @@ static int hci_uart_register_dev(struct hci_uart *hu)
else
hdev->dev_type = HCI_BREDR;
if (test_bit(HCI_UART_INIT_PENDING, &hu->hdev_flags))
return 0;
if (hci_register_dev(hdev) < 0) {
BT_ERR("Can't register HCI device");
hci_free_dev(hdev);
return -ENODEV;
}
set_bit(HCI_UART_REGISTERED, &hu->flags);
return 0;
}

5
drivers/bluetooth/hci_uart.h
View File

@ -47,6 +47,7 @@
#define HCI_UART_RAW_DEVICE 0
#define HCI_UART_RESET_ON_INIT 1
#define HCI_UART_CREATE_AMP 2
#define HCI_UART_INIT_PENDING 3
struct hci_uart;
@ -66,6 +67,8 @@ struct hci_uart {
unsigned long flags;
unsigned long hdev_flags;
struct work_struct init_ready;
struct hci_uart_proto *proto;
void *priv;
@ -76,6 +79,7 @@ struct hci_uart {
/* HCI_UART proto flag bits */
#define HCI_UART_PROTO_SET 0
#define HCI_UART_REGISTERED 1
/* TX states */
#define HCI_UART_SENDING 1
@ -84,6 +88,7 @@ struct hci_uart {
int hci_uart_register_proto(struct hci_uart_proto *p);
int hci_uart_unregister_proto(struct hci_uart_proto *p);
int hci_uart_tx_wakeup(struct hci_uart *hu);
int hci_uart_init_ready(struct hci_uart *hu);
#ifdef CONFIG_BT_HCIUART_H4
int h4_init(void);