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Bluetooth: hci_intel: Introduce LPM support

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Enable controller Low-Power-Mode if we have a pdev to manage host
wake-up. Once LPM is enabled, controller notifies its TX status via
a vendor specific packet (tx_idle/tx_active).
tx_active means that there is more data upcoming from controller.
tx_idle means that controller can be put in suspended state.

Signed-off-by: Loic Poulain <loic.poulain@intel.com>
Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
This commit is contained in:
Loic Poulain 2015-08-29 13:38:19 +02:00 committed by Marcel Holtmann
parent 765ea3abd1
commit b98469f4be
1 changed files with 90 additions and 3 deletions
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93
drivers/bluetooth/hci_intel.c
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@ -44,6 +44,20 @@
#define STATE_FIRMWARE_LOADED 2
#define STATE_FIRMWARE_FAILED 3
#define STATE_BOOTING 4
#define STATE_LPM_ENABLED 5
#define STATE_TX_ACTIVE 6
#define HCI_LPM_PKT 0xf1
#define HCI_LPM_MAX_SIZE 10
#define HCI_LPM_HDR_SIZE HCI_EVENT_HDR_SIZE
#define LPM_OP_TX_NOTIFY 0x00
struct hci_lpm_pkt {
__u8 opcode;
__u8 dlen;
__u8 data[0];
} __packed;
struct intel_device {
struct list_head list;
@ -316,11 +330,14 @@ static int intel_setup(struct hci_uart *hu)
{
static const u8 reset_param[] = { 0x00, 0x01, 0x00, 0x01,
0x00, 0x08, 0x04, 0x00 };
static const u8 lpm_param[] = { 0x03, 0x07, 0x01, 0x0b };
struct intel_data *intel = hu->priv;
struct intel_device *idev = NULL;
struct hci_dev *hdev = hu->hdev;
struct sk_buff *skb;
struct intel_version *ver;
struct intel_boot_params *params;
struct list_head *p;
const struct firmware *fw;
const u8 *fw_ptr;
char fwname[64];
@ -680,6 +697,35 @@ done:
BT_INFO("%s: Device booted in %llu usecs", hdev->name, duration);
/* Enable LPM if matching pdev with wakeup enabled */
spin_lock(&intel_device_list_lock);
list_for_each(p, &intel_device_list) {
struct intel_device *dev = list_entry(p, struct intel_device,
list);
if (hu->tty->dev->parent == dev->pdev->dev.parent) {
if (device_may_wakeup(&dev->pdev->dev))
idev = dev;
break;
}
}
spin_unlock(&intel_device_list_lock);
if (!idev)
goto no_lpm;
BT_INFO("%s: Enabling LPM", hdev->name);
skb = __hci_cmd_sync(hdev, 0xfc8b, sizeof(lpm_param), lpm_param,
HCI_CMD_TIMEOUT);
if (IS_ERR(skb)) {
BT_ERR("%s: Failed to enable LPM", hdev->name);
goto no_lpm;
}
kfree_skb(skb);
set_bit(STATE_LPM_ENABLED, &intel->flags);
no_lpm:
skb = __hci_cmd_sync(hdev, HCI_OP_RESET, 0, NULL, HCI_CMD_TIMEOUT);
if (IS_ERR(skb))
return PTR_ERR(skb);
@ -740,10 +786,51 @@ recv:
return hci_recv_frame(hdev, skb);
}
static void intel_recv_lpm_notify(struct hci_dev *hdev, int value)
{
struct hci_uart *hu = hci_get_drvdata(hdev);
struct intel_data *intel = hu->priv;
BT_DBG("%s: TX idle notification (%d)", hdev->name, value);
if (value)
set_bit(STATE_TX_ACTIVE, &intel->flags);
else
clear_bit(STATE_TX_ACTIVE, &intel->flags);
}
static int intel_recv_lpm(struct hci_dev *hdev, struct sk_buff *skb)
{
struct hci_lpm_pkt *lpm = (void *)skb->data;
switch (lpm->opcode) {
case LPM_OP_TX_NOTIFY:
if (lpm->dlen)
intel_recv_lpm_notify(hdev, lpm->data[0]);
break;
default:
BT_ERR("%s: unknown LPM opcode (%02x)", hdev->name,
lpm->opcode);
break;
}
kfree_skb(skb);
return 0;
}
#define INTEL_RECV_LPM \
.type = HCI_LPM_PKT, \
.hlen = HCI_LPM_HDR_SIZE, \
.loff = 1, \
.lsize = 1, \
.maxlen = HCI_LPM_MAX_SIZE
static const struct h4_recv_pkt intel_recv_pkts[] = {
{ H4_RECV_ACL, .recv = hci_recv_frame },
{ H4_RECV_SCO, .recv = hci_recv_frame },
{ H4_RECV_EVENT, .recv = intel_recv_event },
{ H4_RECV_ACL, .recv = hci_recv_frame },
{ H4_RECV_SCO, .recv = hci_recv_frame },
{ H4_RECV_EVENT, .recv = intel_recv_event },
{ INTEL_RECV_LPM, .recv = intel_recv_lpm },
};
static int intel_recv(struct hci_uart *hu, const void *data, int count)