asgardius/android_kernel_samsung_heroqlte
1
0
Fork 0
Code Issues Pull requests Projects Releases Packages Wiki Activity Actions
android_kernel_samsung_hero.../drivers/bluetooth/hci_ibs.c
HackerOO7 2bd1731e0a init: OSRC G9300ZCU2APF7
2016-08-17 16:41:52 +08:00

910 lines
22 KiB
C
Raw Permalink Blame History

/*
* 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, 2012, 2014, The Linux Foundation. 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.
*/
#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 <linux/platform_data/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
/* TX idle time out value */
#define TX_IDLE_TO 1000
/* 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;
} __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;
struct workqueue_struct *workqueue;
struct work_struct ws_awake_rx;
struct work_struct ws_awake_device;
struct work_struct ws_rx_vote_off;
struct work_struct ws_tx_vote_off;
void *ibs_hu; /* keeps the hci_uart pointer for reference */
/* 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 ibs_wq_awake_device(struct work_struct *work)
{
struct ibs_struct *ibs = container_of(work, struct ibs_struct,
ws_awake_device);
struct hci_uart *hu = (struct hci_uart *)ibs->ibs_hu;
unsigned long flags;
BT_DBG(" %p ", hu);
/* Vote for serial clock */
ibs_msm_serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu);
spin_lock_irqsave(&ibs->hci_ibs_lock, flags);
/* send wake indication to device */
if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0)
BT_ERR("cannot send WAKE to device");
ibs->ibs_sent_wakes++; /* debug */
/* start retransmit timer */
mod_timer(&ibs->wake_retrans_timer, jiffies + msecs_to_jiffies(10));
spin_unlock_irqrestore(&ibs->hci_ibs_lock, flags);
}
static void ibs_wq_awake_rx(struct work_struct *work)
{
struct ibs_struct *ibs = container_of(work, struct ibs_struct,
ws_awake_rx);
struct hci_uart *hu = (struct hci_uart *)ibs->ibs_hu;
unsigned long flags;
BT_DBG(" %p ", hu);
ibs_msm_serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu);
spin_lock_irqsave(&ibs->hci_ibs_lock, flags);
ibs->rx_ibs_state = 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");
ibs->ibs_sent_wacks++; /* debug */
spin_unlock_irqrestore(&ibs->hci_ibs_lock, flags);
/* actually send the packets */
hci_uart_tx_wakeup(hu);
}
static void ibs_wq_serial_rx_clock_vote_off(struct work_struct *work)
{
struct ibs_struct *ibs = container_of(work, struct ibs_struct,
ws_rx_vote_off);
struct hci_uart *hu = (struct hci_uart *)ibs->ibs_hu;
BT_DBG(" %p ", hu);
ibs_msm_serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu);
}
static void ibs_wq_serial_tx_clock_vote_off(struct work_struct *work)
{
struct ibs_struct *ibs = container_of(work, struct ibs_struct,
ws_tx_vote_off);
struct hci_uart *hu = (struct hci_uart *)ibs->ibs_hu;
BT_DBG(" %p ", hu);
hci_uart_tx_wakeup(hu); /* run HCI tx handling unlocked */
/* 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. */
ibs_msm_serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
}
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;
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 */
break;
}
queue_work(ibs->workqueue, &ibs->ws_tx_vote_off);
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);
ibs->workqueue = create_singlethread_workqueue("ibs_wq");
if (!ibs->workqueue) {
BT_ERR("IBS Workqueue not initialized properly");
kfree(ibs);
return -ENOMEM;
}
INIT_WORK(&ibs->ws_awake_rx, ibs_wq_awake_rx);
INIT_WORK(&ibs->ws_awake_device, ibs_wq_awake_device);
INIT_WORK(&ibs->ws_rx_vote_off, ibs_wq_serial_rx_clock_vote_off);
INIT_WORK(&ibs->ws_tx_vote_off, ibs_wq_serial_tx_clock_vote_off);
ibs->ibs_hu = (void *)hu;
/* 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);
destroy_workqueue(ibs->workqueue);
ibs->ibs_hu = NULL;
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
*/
/* awake rx clock */
queue_work(ibs->workqueue, &ibs->ws_awake_rx);
spin_unlock_irqrestore(&ibs->hci_ibs_lock, flags);
return;
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;
/* vote off rx clock under workqueue */
queue_work(ibs->workqueue, &ibs->ws_rx_vote_off);
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-acknowledgment 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 +
msecs_to_jiffies(TX_IDLE_TO));
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 +
msecs_to_jiffies(TX_IDLE_TO));
break;
case HCI_IBS_TX_ASLEEP:
BT_DBG("device asleep, waking up and queueing packet");
/* save packet for later */
skb_queue_tail(&ibs->tx_wait_q, skb);
ibs->tx_ibs_state = HCI_IBS_TX_WAKING;
/* schedule a work queue to wake up device */
queue_work(ibs->workqueue, &ibs->ws_awake_device);
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 hci_dev *hdev,
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(hdev, 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(hu->hdev, 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(hu->hdev, 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(hu->hdev, 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(hu->hdev, ibs, sh->dlen);
continue;
}
}
/* HCI_IBS_W4_PACKET_TYPE */
switch ((unsigned char) *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");
Reference in a new issue View git blame Copy permalink