Initial Contribution
msm-2.6.38: tag AU_LINUX_ANDROID_GINGERBREAD.02.03.04.00.142
Signed-off-by: Bryan Huntsman <bryanh@codeaurora.org>
diff --git a/drivers/bluetooth/hci_ibs.c b/drivers/bluetooth/hci_ibs.c
new file mode 100644
index 0000000..2a6f3f8
--- /dev/null
+++ b/drivers/bluetooth/hci_ibs.c
@@ -0,0 +1,820 @@
+/*
+ * Qualcomm's Bluetooth Software In-Band Sleep UART protocol
+ *
+ * HCI_IBS (HCI In-Band Sleep) is Qualcomm's power management
+ * protocol extension to H4.
+ *
+ * Copyright (C) 2007 Texas Instruments, Inc.
+ * Copyright (c) 2010, Code Aurora Forum. All rights reserved.
+ *
+ * Acknowledgements:
+ * This file is based on hci_ll.c, which was...
+ * Written by Ohad Ben-Cohen <ohad@bencohen.org>
+ * which was in turn based on hci_h4.c, which was written
+ * by Maxim Krasnyansky and Marcel Holtmann.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+
+#include <linux/init.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/interrupt.h>
+#include <linux/ptrace.h>
+#include <linux/poll.h>
+
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/signal.h>
+#include <linux/ioctl.h>
+#include <linux/timer.h>
+#include <linux/skbuff.h>
+#include <linux/serial_core.h>
+
+#ifdef CONFIG_SERIAL_MSM_HS
+#include <mach/msm_serial_hs.h>
+#endif
+
+#include <net/bluetooth/bluetooth.h>
+#include <net/bluetooth/hci_core.h>
+
+#include "hci_uart.h"
+
+/* HCI_IBS protocol messages */
+#define HCI_IBS_SLEEP_IND 0xFE
+#define HCI_IBS_WAKE_IND 0xFD
+#define HCI_IBS_WAKE_ACK 0xFC
+
+/* HCI_IBS receiver States */
+#define HCI_IBS_W4_PACKET_TYPE 0
+#define HCI_IBS_W4_EVENT_HDR 1
+#define HCI_IBS_W4_ACL_HDR 2
+#define HCI_IBS_W4_SCO_HDR 3
+#define HCI_IBS_W4_DATA 4
+
+/* HCI_IBS transmit side sleep protocol states */
+enum tx_ibs_states_e {
+ HCI_IBS_TX_ASLEEP,
+ HCI_IBS_TX_WAKING,
+ HCI_IBS_TX_AWAKE,
+};
+
+/* HCI_IBS receive side sleep protocol states */
+enum rx_states_e {
+ HCI_IBS_RX_ASLEEP,
+ HCI_IBS_RX_AWAKE,
+};
+
+/* HCI_IBS transmit and receive side clock state vote */
+enum hci_ibs_clock_state_vote_e {
+ HCI_IBS_VOTE_STATS_UPDATE,
+ HCI_IBS_TX_VOTE_CLOCK_ON,
+ HCI_IBS_TX_VOTE_CLOCK_OFF,
+ HCI_IBS_RX_VOTE_CLOCK_ON,
+ HCI_IBS_RX_VOTE_CLOCK_OFF,
+};
+
+static unsigned long wake_retrans = 1;
+static unsigned long tx_idle_delay = (HZ * 2);
+
+struct hci_ibs_cmd {
+ u8 cmd;
+} __attribute__((packed));
+
+struct ibs_struct {
+ unsigned long rx_state;
+ unsigned long rx_count;
+ struct sk_buff *rx_skb;
+ struct sk_buff_head txq;
+ struct sk_buff_head tx_wait_q; /* HCI_IBS wait queue */
+ spinlock_t hci_ibs_lock; /* HCI_IBS state lock */
+ unsigned long tx_ibs_state; /* HCI_IBS transmit side power state */
+ unsigned long rx_ibs_state; /* HCI_IBS receive side power state */
+ unsigned long tx_vote; /* clock must be on for TX */
+ unsigned long rx_vote; /* clock must be on for RX */
+ struct timer_list tx_idle_timer;
+ struct timer_list wake_retrans_timer;
+ /* debug */
+ unsigned long ibs_sent_wacks;
+ unsigned long ibs_sent_slps;
+ unsigned long ibs_sent_wakes;
+ unsigned long ibs_recv_wacks;
+ unsigned long ibs_recv_slps;
+ unsigned long ibs_recv_wakes;
+ unsigned long vote_last_jif;
+ unsigned long vote_on_ticks;
+ unsigned long vote_off_ticks;
+ unsigned long tx_votes_on;
+ unsigned long rx_votes_on;
+ unsigned long tx_votes_off;
+ unsigned long rx_votes_off;
+ unsigned long votes_on;
+ unsigned long votes_off;
+};
+
+#ifdef CONFIG_SERIAL_MSM_HS
+static void __ibs_msm_serial_clock_on(struct tty_struct *tty)
+{
+ struct uart_state *state = tty->driver_data;
+ struct uart_port *port = state->uart_port;
+
+ msm_hs_request_clock_on(port);
+}
+
+static void __ibs_msm_serial_clock_request_off(struct tty_struct *tty)
+{
+ struct uart_state *state = tty->driver_data;
+ struct uart_port *port = state->uart_port;
+
+ msm_hs_request_clock_off(port);
+}
+#else
+static inline void __ibs_msm_serial_clock_on(struct tty_struct *tty) {}
+static inline void __ibs_msm_serial_clock_request_off(struct tty_struct *tty) {}
+#endif
+
+/* clock_vote needs to be called with the ibs lock held */
+static void ibs_msm_serial_clock_vote(unsigned long vote, struct hci_uart *hu)
+{
+ struct ibs_struct *ibs = hu->priv;
+
+ unsigned long old_vote = (ibs->tx_vote | ibs->rx_vote);
+ unsigned long new_vote;
+
+ switch (vote) {
+ default: /* error */
+ BT_ERR("voting irregularity");
+ return;
+ case HCI_IBS_VOTE_STATS_UPDATE:
+ if (old_vote)
+ ibs->vote_off_ticks += (jiffies - ibs->vote_last_jif);
+ else
+ ibs->vote_on_ticks += (jiffies - ibs->vote_last_jif);
+ return;
+ case HCI_IBS_TX_VOTE_CLOCK_ON:
+ ibs->tx_vote = 1;
+ ibs->tx_votes_on++;
+ new_vote = 1;
+ break;
+ case HCI_IBS_RX_VOTE_CLOCK_ON:
+ ibs->rx_vote = 1;
+ ibs->rx_votes_on++;
+ new_vote = 1;
+ break;
+ case HCI_IBS_TX_VOTE_CLOCK_OFF:
+ ibs->tx_vote = 0;
+ ibs->tx_votes_off++;
+ new_vote = ibs->rx_vote | ibs->tx_vote;
+ break;
+ case HCI_IBS_RX_VOTE_CLOCK_OFF:
+ ibs->rx_vote = 0;
+ ibs->rx_votes_off++;
+ new_vote = ibs->rx_vote | ibs->tx_vote;
+ break;
+ }
+ if (new_vote != old_vote) {
+ if (new_vote)
+ __ibs_msm_serial_clock_on(hu->tty);
+ else
+ __ibs_msm_serial_clock_request_off(hu->tty);
+
+ BT_DBG("HCIUART_IBS: vote msm_serial_hs clock %lu(%lu)",
+ new_vote, vote);
+ /* debug */
+ if (new_vote) {
+ ibs->votes_on++;
+ ibs->vote_off_ticks += (jiffies - ibs->vote_last_jif);
+ } else {
+ ibs->votes_off++;
+ ibs->vote_on_ticks += (jiffies - ibs->vote_last_jif);
+ }
+ ibs->vote_last_jif = jiffies;
+ }
+}
+
+/*
+ * Builds and sends an HCI_IBS command packet.
+ * These are very simple packets with only 1 cmd byte
+ */
+static int send_hci_ibs_cmd(u8 cmd, struct hci_uart *hu)
+{
+ int err = 0;
+ struct sk_buff *skb = NULL;
+ struct ibs_struct *ibs = hu->priv;
+ struct hci_ibs_cmd *hci_ibs_packet;
+
+ BT_DBG("hu %p cmd 0x%x", hu, cmd);
+
+ /* allocate packet */
+ skb = bt_skb_alloc(1, GFP_ATOMIC);
+ if (!skb) {
+ BT_ERR("cannot allocate memory for HCI_IBS packet");
+ err = -ENOMEM;
+ goto out;
+ }
+
+ /* prepare packet */
+ hci_ibs_packet = (struct hci_ibs_cmd *) skb_put(skb, 1);
+ hci_ibs_packet->cmd = cmd;
+ skb->dev = (void *) hu->hdev;
+
+ /* send packet */
+ skb_queue_tail(&ibs->txq, skb);
+out:
+ return err;
+}
+
+static void hci_ibs_tx_idle_timeout(unsigned long arg)
+{
+ struct hci_uart *hu = (struct hci_uart *) arg;
+ struct ibs_struct *ibs = hu->priv;
+ unsigned long flags;
+ unsigned long vote_tx_sleep = 0;
+
+ BT_DBG("hu %p idle timeout in %lu state", hu, ibs->tx_ibs_state);
+
+ spin_lock_irqsave_nested(&ibs->hci_ibs_lock,
+ flags, SINGLE_DEPTH_NESTING);
+
+ switch (ibs->tx_ibs_state) {
+ default:
+ case HCI_IBS_TX_ASLEEP:
+ case HCI_IBS_TX_WAKING:
+ BT_ERR("spurrious timeout in tx state %ld", ibs->tx_ibs_state);
+ goto out;
+ case HCI_IBS_TX_AWAKE: /* TX_IDLE, go to SLEEP */
+ if (send_hci_ibs_cmd(HCI_IBS_SLEEP_IND, hu) < 0) {
+ BT_ERR("cannot send SLEEP to device");
+ goto out;
+ }
+ ibs->tx_ibs_state = HCI_IBS_TX_ASLEEP;
+ ibs->ibs_sent_slps++; /* debug */
+ vote_tx_sleep = 1;
+ break;
+ }
+
+ spin_unlock_irqrestore(&ibs->hci_ibs_lock, flags);
+
+ hci_uart_tx_wakeup(hu); /* run HCI tx handling unlocked */
+
+ if (!vote_tx_sleep)
+ return;
+ /* now that message queued to tty driver, vote for tty clocks off */
+ /* It is up to the tty driver to pend the clocks off until tx done. */
+
+ spin_lock_irqsave_nested(&ibs->hci_ibs_lock,
+ flags, SINGLE_DEPTH_NESTING);
+ ibs_msm_serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
+out:
+ spin_unlock_irqrestore(&ibs->hci_ibs_lock, flags);
+}
+
+static void hci_ibs_wake_retrans_timeout(unsigned long arg)
+{
+ struct hci_uart *hu = (struct hci_uart *) arg;
+ struct ibs_struct *ibs = hu->priv;
+ unsigned long flags;
+ unsigned long retransmit = 0;
+
+ BT_DBG("hu %p wake retransmit timeout in %lu state",
+ hu, ibs->tx_ibs_state);
+
+ spin_lock_irqsave_nested(&ibs->hci_ibs_lock,
+ flags, SINGLE_DEPTH_NESTING);
+
+ switch (ibs->tx_ibs_state) {
+ default:
+ case HCI_IBS_TX_ASLEEP:
+ case HCI_IBS_TX_AWAKE:
+ BT_ERR("spurrious timeout tx state %ld", ibs->tx_ibs_state);
+ goto out;
+ case HCI_IBS_TX_WAKING: /* No WAKE_ACK, retransmit WAKE */
+ retransmit = 1;
+ if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) {
+ BT_ERR("cannot acknowledge device wake up");
+ goto out;
+ }
+ ibs->ibs_sent_wakes++; /* debug */
+ mod_timer(&ibs->wake_retrans_timer, jiffies + wake_retrans);
+ break;
+ }
+out:
+ spin_unlock_irqrestore(&ibs->hci_ibs_lock, flags);
+ if (retransmit)
+ hci_uart_tx_wakeup(hu);
+}
+
+/* Initialize protocol */
+static int ibs_open(struct hci_uart *hu)
+{
+ struct ibs_struct *ibs;
+
+ BT_DBG("hu %p", hu);
+
+ ibs = kzalloc(sizeof(*ibs), GFP_ATOMIC);
+ if (!ibs)
+ return -ENOMEM;
+
+ skb_queue_head_init(&ibs->txq);
+ skb_queue_head_init(&ibs->tx_wait_q);
+ spin_lock_init(&ibs->hci_ibs_lock);
+
+ /* Assume we start with both sides asleep -- extra wakes OK */
+ ibs->tx_ibs_state = HCI_IBS_TX_ASLEEP;
+ ibs->rx_ibs_state = HCI_IBS_RX_ASLEEP;
+ /* clocks actually on, but we start votes off */
+ ibs->tx_vote = 0;
+ ibs->rx_vote = 0;
+
+ /* debug */
+ ibs->ibs_sent_wacks = 0;
+ ibs->ibs_sent_slps = 0;
+ ibs->ibs_sent_wakes = 0;
+ ibs->ibs_recv_wacks = 0;
+ ibs->ibs_recv_slps = 0;
+ ibs->ibs_recv_wakes = 0;
+ ibs->vote_last_jif = jiffies;
+ ibs->vote_on_ticks = 0;
+ ibs->vote_off_ticks = 0;
+ ibs->votes_on = 0;
+ ibs->votes_off = 0;
+ ibs->tx_votes_on = 0;
+ ibs->tx_votes_off = 0;
+ ibs->rx_votes_on = 0;
+ ibs->rx_votes_off = 0;
+
+ hu->priv = ibs;
+
+ init_timer(&ibs->wake_retrans_timer);
+ ibs->wake_retrans_timer.function = hci_ibs_wake_retrans_timeout;
+ ibs->wake_retrans_timer.data = (u_long) hu;
+
+ init_timer(&ibs->tx_idle_timer);
+ ibs->tx_idle_timer.function = hci_ibs_tx_idle_timeout;
+ ibs->tx_idle_timer.data = (u_long) hu;
+
+ BT_INFO("HCI_IBS open, tx_idle_delay=%lu, wake_retrans=%lu",
+ tx_idle_delay, wake_retrans);
+
+ return 0;
+}
+
+void ibs_log_local_stats(struct ibs_struct *ibs)
+{
+ BT_INFO("HCI_IBS stats: tx_idle_delay=%lu, wake_retrans=%lu",
+ tx_idle_delay, wake_retrans);
+
+ BT_INFO("HCI_IBS stats: tx_ibs_state=%lu, rx_ibs_state=%lu",
+ ibs->tx_ibs_state, ibs->rx_ibs_state);
+ BT_INFO("HCI_IBS stats: sent: sleep=%lu, wake=%lu, wake_ack=%lu",
+ ibs->ibs_sent_slps, ibs->ibs_sent_wakes, ibs->ibs_sent_wacks);
+ BT_INFO("HCI_IBS stats: recv: sleep=%lu, wake=%lu, wake_ack=%lu",
+ ibs->ibs_recv_slps, ibs->ibs_recv_wakes, ibs->ibs_recv_wacks);
+
+ BT_INFO("HCI_IBS stats: queues: txq=%s, txwaitq=%s",
+ skb_queue_empty(&(ibs->txq)) ? "empty" : "full",
+ skb_queue_empty(&(ibs->tx_wait_q)) ? "empty" : "full");
+
+ BT_INFO("HCI_IBS stats: vote state: tx=%lu, rx=%lu",
+ ibs->tx_vote, ibs->rx_vote);
+ BT_INFO("HCI_IBS stats: tx votes cast: on=%lu, off=%lu",
+ ibs->tx_votes_on, ibs->tx_votes_off);
+ BT_INFO("HCI_IBS stats: rx votes cast: on=%lu, off=%lu",
+ ibs->rx_votes_on, ibs->rx_votes_off);
+ BT_INFO("HCI_IBS stats: msm_clock votes cast: on=%lu, off=%lu",
+ ibs->votes_on, ibs->votes_off);
+ BT_INFO("HCI_IBS stats: vote ticks: on=%lu, off=%lu",
+ ibs->vote_on_ticks, ibs->vote_off_ticks);
+}
+
+/* Flush protocol data */
+static int ibs_flush(struct hci_uart *hu)
+{
+ struct ibs_struct *ibs = hu->priv;
+
+ BT_DBG("hu %p", hu);
+
+ skb_queue_purge(&ibs->tx_wait_q);
+ skb_queue_purge(&ibs->txq);
+
+ return 0;
+}
+
+/* Close protocol */
+static int ibs_close(struct hci_uart *hu)
+{
+ struct ibs_struct *ibs = hu->priv;
+
+ BT_DBG("hu %p", hu);
+
+ ibs_msm_serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu);
+ ibs_log_local_stats(ibs);
+
+ skb_queue_purge(&ibs->tx_wait_q);
+ skb_queue_purge(&ibs->txq);
+ del_timer(&ibs->tx_idle_timer);
+ del_timer(&ibs->wake_retrans_timer);
+
+ kfree_skb(ibs->rx_skb);
+
+ hu->priv = NULL;
+
+ kfree(ibs);
+
+ return 0;
+}
+
+/*
+ * Called upon a wake-up-indication from the device
+ */
+static void ibs_device_want_to_wakeup(struct hci_uart *hu)
+{
+ unsigned long flags;
+ struct ibs_struct *ibs = hu->priv;
+
+ BT_DBG("hu %p", hu);
+
+ /* lock hci_ibs state */
+ spin_lock_irqsave(&ibs->hci_ibs_lock, flags);
+
+ /* debug */
+ ibs->ibs_recv_wakes++;
+
+ switch (ibs->rx_ibs_state) {
+ case HCI_IBS_RX_ASLEEP:
+ /* Make sure clock is on - we may have turned clock off since
+ * receiving the wake up indicator
+ */
+ ibs_msm_serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu);
+ ibs->rx_ibs_state = HCI_IBS_RX_AWAKE;
+ /* deliberate fall-through */
+ case HCI_IBS_RX_AWAKE:
+ /* Always acknowledge device wake up,
+ * sending IBS message doesn't count as TX ON.
+ */
+ if (send_hci_ibs_cmd(HCI_IBS_WAKE_ACK, hu) < 0) {
+ BT_ERR("cannot acknowledge device wake up");
+ goto out;
+ }
+ ibs->ibs_sent_wacks++; /* debug */
+ break;
+ default:
+ /* any other state is illegal */
+ BT_ERR("received HCI_IBS_WAKE_IND in rx state %ld",
+ ibs->rx_ibs_state);
+ break;
+ }
+
+out:
+ spin_unlock_irqrestore(&ibs->hci_ibs_lock, flags);
+
+ /* actually send the packets */
+ hci_uart_tx_wakeup(hu);
+}
+
+/*
+ * Called upon a sleep-indication from the device
+ */
+static void ibs_device_want_to_sleep(struct hci_uart *hu)
+{
+ unsigned long flags;
+ struct ibs_struct *ibs = hu->priv;
+
+ BT_DBG("hu %p", hu);
+
+ /* lock hci_ibs state */
+ spin_lock_irqsave(&ibs->hci_ibs_lock, flags);
+
+ /* debug */
+ ibs->ibs_recv_slps++;
+
+ switch (ibs->rx_ibs_state) {
+ case HCI_IBS_RX_AWAKE:
+ /* update state */
+ ibs->rx_ibs_state = HCI_IBS_RX_ASLEEP;
+ ibs_msm_serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu);
+ break;
+ case HCI_IBS_RX_ASLEEP:
+ /* deliberate fall-through */
+ default:
+ /* any other state is illegal */
+ BT_ERR("received HCI_IBS_SLEEP_IND in rx state %ld",
+ ibs->rx_ibs_state);
+ break;
+ }
+
+ spin_unlock_irqrestore(&ibs->hci_ibs_lock, flags);
+}
+
+/*
+ * Called upon wake-up-acknowledgement from the device
+ */
+static void ibs_device_woke_up(struct hci_uart *hu)
+{
+ unsigned long flags;
+ struct ibs_struct *ibs = hu->priv;
+ struct sk_buff *skb = NULL;
+
+ BT_DBG("hu %p", hu);
+
+ /* lock hci_ibs state */
+ spin_lock_irqsave(&ibs->hci_ibs_lock, flags);
+
+ /* debug */
+ ibs->ibs_recv_wacks++;
+
+ switch (ibs->tx_ibs_state) {
+ case HCI_IBS_TX_ASLEEP:
+ /* This could be spurrious rx wake on the BT chip.
+ * Send it another SLEEP othwise it will stay awake. */
+ default:
+ BT_ERR("received HCI_IBS_WAKE_ACK in tx state %ld",
+ ibs->tx_ibs_state);
+ break;
+ case HCI_IBS_TX_AWAKE:
+ /* expect one if we send 2 WAKEs */
+ BT_DBG("received HCI_IBS_WAKE_ACK in tx state %ld",
+ ibs->tx_ibs_state);
+ break;
+ case HCI_IBS_TX_WAKING:
+ /* send pending packets */
+ while ((skb = skb_dequeue(&ibs->tx_wait_q)))
+ skb_queue_tail(&ibs->txq, skb);
+ /* switch timers and change state to HCI_IBS_TX_AWAKE */
+ del_timer(&ibs->wake_retrans_timer);
+ mod_timer(&ibs->tx_idle_timer, jiffies + tx_idle_delay);
+ ibs->tx_ibs_state = HCI_IBS_TX_AWAKE;
+ }
+
+ spin_unlock_irqrestore(&ibs->hci_ibs_lock, flags);
+
+ /* actually send the packets */
+ hci_uart_tx_wakeup(hu);
+}
+
+/* Enqueue frame for transmittion (padding, crc, etc) */
+/* may be called from two simultaneous tasklets */
+static int ibs_enqueue(struct hci_uart *hu, struct sk_buff *skb)
+{
+ unsigned long flags = 0;
+ struct ibs_struct *ibs = hu->priv;
+
+ BT_DBG("hu %p skb %p", hu, skb);
+
+ /* Prepend skb with frame type */
+ memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1);
+
+ /* lock hci_ibs state */
+ spin_lock_irqsave(&ibs->hci_ibs_lock, flags);
+
+ /* act according to current state */
+ switch (ibs->tx_ibs_state) {
+ case HCI_IBS_TX_AWAKE:
+ BT_DBG("device awake, sending normally");
+ skb_queue_tail(&ibs->txq, skb);
+ mod_timer(&ibs->tx_idle_timer, jiffies + tx_idle_delay);
+ break;
+
+ case HCI_IBS_TX_ASLEEP:
+ BT_DBG("device asleep, waking up and queueing packet");
+ ibs_msm_serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu);
+ /* save packet for later */
+ skb_queue_tail(&ibs->tx_wait_q, skb);
+ /* awake device */
+ if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) {
+ BT_ERR("cannot send WAKE to device");
+ break;
+ }
+ ibs->ibs_sent_wakes++; /* debug */
+
+ /* start retransmit timer */
+ mod_timer(&ibs->wake_retrans_timer, jiffies + wake_retrans);
+
+ ibs->tx_ibs_state = HCI_IBS_TX_WAKING;
+ break;
+
+ case HCI_IBS_TX_WAKING:
+ BT_DBG("device waking up, queueing packet");
+ /* transient state; just keep packet for later */
+ skb_queue_tail(&ibs->tx_wait_q, skb);
+ break;
+
+ default:
+ BT_ERR("illegal tx state: %ld (losing packet)",
+ ibs->tx_ibs_state);
+ kfree_skb(skb);
+ break;
+ }
+
+ spin_unlock_irqrestore(&ibs->hci_ibs_lock, flags);
+
+ return 0;
+}
+
+static inline int ibs_check_data_len(struct ibs_struct *ibs, int len)
+{
+ register int room = skb_tailroom(ibs->rx_skb);
+
+ BT_DBG("len %d room %d", len, room);
+
+ if (!len) {
+ hci_recv_frame(ibs->rx_skb);
+ } else if (len > room) {
+ BT_ERR("Data length is too large");
+ kfree_skb(ibs->rx_skb);
+ } else {
+ ibs->rx_state = HCI_IBS_W4_DATA;
+ ibs->rx_count = len;
+ return len;
+ }
+
+ ibs->rx_state = HCI_IBS_W4_PACKET_TYPE;
+ ibs->rx_skb = NULL;
+ ibs->rx_count = 0;
+
+ return 0;
+}
+
+/* Recv data */
+static int ibs_recv(struct hci_uart *hu, void *data, int count)
+{
+ struct ibs_struct *ibs = hu->priv;
+ register char *ptr;
+ struct hci_event_hdr *eh;
+ struct hci_acl_hdr *ah;
+ struct hci_sco_hdr *sh;
+ register int len, type, dlen;
+
+ BT_DBG("hu %p count %d rx_state %ld rx_count %ld",
+ hu, count, ibs->rx_state, ibs->rx_count);
+
+ ptr = data;
+ while (count) {
+ if (ibs->rx_count) {
+ len = min_t(unsigned int, ibs->rx_count, count);
+ memcpy(skb_put(ibs->rx_skb, len), ptr, len);
+ ibs->rx_count -= len; count -= len; ptr += len;
+
+ if (ibs->rx_count)
+ continue;
+
+ switch (ibs->rx_state) {
+ case HCI_IBS_W4_DATA:
+ BT_DBG("Complete data");
+ hci_recv_frame(ibs->rx_skb);
+
+ ibs->rx_state = HCI_IBS_W4_PACKET_TYPE;
+ ibs->rx_skb = NULL;
+ continue;
+
+ case HCI_IBS_W4_EVENT_HDR:
+ eh = (struct hci_event_hdr *) ibs->rx_skb->data;
+
+ BT_DBG("Event header: evt 0x%2.2x plen %d",
+ eh->evt, eh->plen);
+
+ ibs_check_data_len(ibs, eh->plen);
+ continue;
+
+ case HCI_IBS_W4_ACL_HDR:
+ ah = (struct hci_acl_hdr *) ibs->rx_skb->data;
+ dlen = __le16_to_cpu(ah->dlen);
+
+ BT_DBG("ACL header: dlen %d", dlen);
+
+ ibs_check_data_len(ibs, dlen);
+ continue;
+
+ case HCI_IBS_W4_SCO_HDR:
+ sh = (struct hci_sco_hdr *) ibs->rx_skb->data;
+
+ BT_DBG("SCO header: dlen %d", sh->dlen);
+
+ ibs_check_data_len(ibs, sh->dlen);
+ continue;
+ }
+ }
+
+ /* HCI_IBS_W4_PACKET_TYPE */
+ switch (*ptr) {
+ case HCI_EVENT_PKT:
+ BT_DBG("Event packet");
+ ibs->rx_state = HCI_IBS_W4_EVENT_HDR;
+ ibs->rx_count = HCI_EVENT_HDR_SIZE;
+ type = HCI_EVENT_PKT;
+ break;
+
+ case HCI_ACLDATA_PKT:
+ BT_DBG("ACL packet");
+ ibs->rx_state = HCI_IBS_W4_ACL_HDR;
+ ibs->rx_count = HCI_ACL_HDR_SIZE;
+ type = HCI_ACLDATA_PKT;
+ break;
+
+ case HCI_SCODATA_PKT:
+ BT_DBG("SCO packet");
+ ibs->rx_state = HCI_IBS_W4_SCO_HDR;
+ ibs->rx_count = HCI_SCO_HDR_SIZE;
+ type = HCI_SCODATA_PKT;
+ break;
+
+ /* HCI_IBS signals */
+ case HCI_IBS_SLEEP_IND:
+ BT_DBG("HCI_IBS_SLEEP_IND packet");
+ ibs_device_want_to_sleep(hu);
+ ptr++; count--;
+ continue;
+
+ case HCI_IBS_WAKE_IND:
+ BT_DBG("HCI_IBS_WAKE_IND packet");
+ ibs_device_want_to_wakeup(hu);
+ ptr++; count--;
+ continue;
+
+ case HCI_IBS_WAKE_ACK:
+ BT_DBG("HCI_IBS_WAKE_ACK packet");
+ ibs_device_woke_up(hu);
+ ptr++; count--;
+ continue;
+
+ default:
+ BT_ERR("Unknown HCI packet type %2.2x", (__u8)*ptr);
+ hu->hdev->stat.err_rx++;
+ ptr++; count--;
+ continue;
+ };
+
+ ptr++; count--;
+
+ /* Allocate packet */
+ ibs->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
+ if (!ibs->rx_skb) {
+ BT_ERR("Can't allocate mem for new packet");
+ ibs->rx_state = HCI_IBS_W4_PACKET_TYPE;
+ ibs->rx_count = 0;
+ return 0;
+ }
+
+ ibs->rx_skb->dev = (void *) hu->hdev;
+ bt_cb(ibs->rx_skb)->pkt_type = type;
+ }
+
+ return count;
+}
+
+static struct sk_buff *ibs_dequeue(struct hci_uart *hu)
+{
+ struct ibs_struct *ibs = hu->priv;
+ return skb_dequeue(&ibs->txq);
+}
+
+static struct hci_uart_proto ibs_p = {
+ .id = HCI_UART_IBS,
+ .open = ibs_open,
+ .close = ibs_close,
+ .recv = ibs_recv,
+ .enqueue = ibs_enqueue,
+ .dequeue = ibs_dequeue,
+ .flush = ibs_flush,
+};
+
+int ibs_init(void)
+{
+ int err = hci_uart_register_proto(&ibs_p);
+
+ if (!err)
+ BT_INFO("HCI_IBS protocol initialized");
+ else
+ BT_ERR("HCI_IBS protocol registration failed");
+
+ return err;
+}
+
+int ibs_deinit(void)
+{
+ return hci_uart_unregister_proto(&ibs_p);
+}
+
+module_param(wake_retrans, ulong, 0644);
+MODULE_PARM_DESC(wake_retrans, "Delay (1/HZ) to retransmit WAKE_IND");
+
+module_param(tx_idle_delay, ulong, 0644);
+MODULE_PARM_DESC(tx_idle_delay, "Delay (1/HZ) since last tx for SLEEP_IND");