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Bluetooth: btusb: Provide hardware error handler for Intel devices 

The Intel Bluetooth controllers can provide an additional exception
info string when a hardware error event occurs. The core will now
call hdev->hw_error to let the driver read out this information.

This change will cause a reset of the hardware to bring it back
into functional state and then read the Intel exception info
string and print it along with the error information.

Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Johan Hedberg <johan.hedberg@intel.com>
This commit is contained in:
Marcel Holtmann 2015-01-28 11:09:56 -08:00
parent c7741d16a5
commit 385a768c3b
1 changed files with 42 additions and 0 deletions
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42
drivers/bluetooth/btusb.c
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@ -2266,6 +2266,46 @@ static int btusb_setup_intel_new(struct hci_dev *hdev)
return 0;
}
static void btusb_hw_error_intel(struct hci_dev *hdev, u8 code)
{
struct sk_buff *skb;
u8 type = 0x00;
BT_ERR("%s: Hardware error 0x%2.2x", hdev->name, code);
skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_INIT_TIMEOUT);
if (IS_ERR(skb)) {
BT_ERR("%s: Reset after hardware error failed (%ld)",
hdev->name, PTR_ERR(skb));
return;
}
kfree_skb(skb);
skb = __hci_cmd_sync(hdev, 0xfc22, 1, &type, HCI_INIT_TIMEOUT);
if (IS_ERR(skb)) {
BT_ERR("%s: Retrieving Intel exception info failed (%ld)",
hdev->name, PTR_ERR(skb));
return;
}
if (skb->len != 13) {
BT_ERR("%s: Exception info size mismatch", hdev->name);
kfree_skb(skb);
return;
}
if (skb->data[0] != 0x00) {
BT_ERR("%s: Exception info command failure (%02x)",
hdev->name, skb->data[0]);
kfree_skb(skb);
return;
}
BT_ERR("%s: Exception info %s", hdev->name, (char *)(skb->data + 1));
kfree_skb(skb);
}
static int btusb_set_bdaddr_intel(struct hci_dev *hdev, const bdaddr_t *bdaddr)
{
struct sk_buff *skb;
@ -2649,12 +2689,14 @@ static int btusb_probe(struct usb_interface *intf,
if (id->driver_info & BTUSB_INTEL) {
hdev->setup = btusb_setup_intel;
hdev->hw_error = btusb_hw_error_intel;
hdev->set_bdaddr = btusb_set_bdaddr_intel;
}
if (id->driver_info & BTUSB_INTEL_NEW) {
hdev->send = btusb_send_frame_intel;
hdev->setup = btusb_setup_intel_new;
hdev->hw_error = btusb_hw_error_intel;
hdev->set_bdaddr = btusb_set_bdaddr_intel;
}