QCA61x4 chips have supported sleep feature using In-Band-Sleep commands to enable sleep feature based on H4 protocol. After sending patch/nvm configuration is done, IBS mode will be up and running Signed-off-by: Ben Young Tae Kim <ytkim@xxxxxxxxxxxxxxxx> --- drivers/bluetooth/Kconfig | 13 + drivers/bluetooth/Makefile | 1 + drivers/bluetooth/hci_ldisc.c | 6 + drivers/bluetooth/hci_qca.c | 1004 +++++++++++++++++++++++++++++++++++++++++ drivers/bluetooth/hci_uart.h | 8 +- 5 files changed, 1031 insertions(+), 1 deletion(-) create mode 100644 drivers/bluetooth/hci_qca.c diff --git a/drivers/bluetooth/Kconfig b/drivers/bluetooth/Kconfig index f580334..0bd88c9 100644 --- a/drivers/bluetooth/Kconfig +++ b/drivers/bluetooth/Kconfig @@ -155,6 +155,19 @@ config BT_HCIUART_BCM Say Y here to compile support for Broadcom protocol. +config BT_HCIUART_QCA + bool "Qualcomm Atheros protocol support" + depends on BT_HCIUART + select BT_HCIUART_H4 + select BT_QCA + help + The Qualcomm Atheros
protocol supports HCI In-Band Sleep feature + over serial port interface(H4) between controller and host. + This protocol is required for UART clock control for QCA Bluetooth + devices. + + Say Y here to compile support for QCA protocol. + config BT_HCIBCM203X tristate "HCI BCM203x USB driver" depends on USB diff --git a/drivers/bluetooth/Makefile b/drivers/bluetooth/Makefile index 15a0d1d..07c9cf3 100644 --- a/drivers/bluetooth/Makefile +++ b/drivers/bluetooth/Makefile @@ -35,6 +35,7 @@ hci_uart-$(CONFIG_BT_HCIUART_ATH3K) += hci_ath.o hci_uart-$(CONFIG_BT_HCIUART_3WIRE) += hci_h5.o hci_uart-$(CONFIG_BT_HCIUART_INTEL) += hci_intel.o hci_uart-$(CONFIG_BT_HCIUART_BCM) += hci_bcm.o +hci_uart-$(CONFIG_BT_HCIUART_QCA) += hci_qca.o hci_uart-objs := $(hci_uart-y) ccflags-y += -D__CHECK_ENDIAN__ diff --git a/drivers/bluetooth/hci_ldisc.c b/drivers/bluetooth/hci_ldisc.c index 20c2ac1..0d5a05a 100644 --- a/drivers/bluetooth/hci_ldisc.c +++ b/drivers/bluetooth/hci_ldisc.c @@ -810,6
+810,9 @@ static int __init hci_uart_init(void) #ifdef CONFIG_BT_HCIUART_BCM bcm_init(); #endif +#ifdef CONFIG_BT_HCIUART_QCA + qca_init(); +#endif return 0; } @@ -839,6 +842,9 @@ static void __exit hci_uart_exit(void) #ifdef CONFIG_BT_HCIUART_BCM bcm_deinit(); #endif +#ifdef CONFIG_BT_HCIUART_QCA + qca_deinit(); +#endif /* Release tty registration of line discipline */ err = tty_unregister_ldisc(N_HCI); diff --git a/drivers/bluetooth/hci_qca.c b/drivers/bluetooth/hci_qca.c new file mode 100644 index 0000000..f4afa4a --- /dev/null +++ b/drivers/bluetooth/hci_qca.c @@ -0,0 +1,1004 @@ +/* + * Bluetooth Software UART Qualcomm 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 The Linux Foundation. All rights reserved. + * + * Acknowledgements: + * This file is based on hci_ll.c, which was... + * Written by Ohad Ben-Cohen <ohad@xxxxxxxxxxxx> + *
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> +#include <linux/debugfs.h> + +#include <net/bluetooth/bluetooth.h> +#include <net/bluetooth/hci_core.h> + +#include "hci_uart.h" +#include "btqca.h" + +/* HCI_IBS protocol messages */ +#define HCI_IBS_SLEEP_IND 0xFE +#define HCI_IBS_WAKE_IND 0xFD +#define HCI_IBS_WAKE_ACK 0xFC +#define HCI_MAX_IBS_SIZE 10 + +/* Controller states */ +#define STATE_IN_BAND_SLEEP_ENABLED 1 + +#define IBS_WAKE_RETRANS_TIMEOUT 100 +#define IBS_TX_IDLE_TIMEOUT 2000 +#define BAUDRATE_SETTLE_TIMEOUT 300 + +/* 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 int wake_retrans; +static unsigned int tx_idle_delay; + +struct qca_data { + struct hci_uart *hu; + 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 */ + u8 tx_ibs_state; /* HCI_IBS transmit side power state*/ + u8 rx_ibs_state; /* HCI_IBS receive side power state */ + bool tx_vote; /* clock must be on for TX */ + bool 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; + struct dentry *ibs_dir; + unsigned long flags; + + /* debug */ + u64 ibs_sent_wacks; + u64 ibs_sent_slps; + u64 ibs_sent_wakes; + u64 ibs_recv_wacks; + u64 ibs_recv_slps; + u64 ibs_recv_wakes; + u64 vote_last_jif; + u32 vote_on_ms; + u32 vote_off_ms; + u64 tx_votes_on; + u64 rx_votes_on; + u64 tx_votes_off; + u64 rx_votes_off; + u64 votes_on; + u64 votes_off; +}; + +static void __serial_clock_on(struct tty_struct *tty) +{ + /* TODO: Some chipset requires to enable UART clock on client + * side to save power consumption or manual work is required. + * Please put your code to control UART clock here if needed + */ +} + +static void __serial_clock_off(struct tty_struct *tty) +{ + /* TODO: Some chipset requires to disable UART clock on client + * side to save power consumption or manual work is required. + * Please put your code to control UART clock off here if needed + */ +} + +/* clock_vote needs to be called with the ibs lock held */ +static void
serial_clock_vote(unsigned long vote, struct hci_uart *hu) +{ + struct qca_data *qca = hu->priv; + unsigned int diff; + + bool old_vote = (qca->tx_vote | qca->rx_vote); + bool new_vote; + + switch (vote) { + case HCI_IBS_VOTE_STATS_UPDATE: + diff = jiffies_to_msecs(jiffies - qca->vote_last_jif); + + if (old_vote) + qca->vote_off_ms += diff; + else + qca->vote_on_ms += diff; + return; + + case HCI_IBS_TX_VOTE_CLOCK_ON: + qca->tx_vote = true; + qca->tx_votes_on++; + new_vote = true; + break; + + case HCI_IBS_RX_VOTE_CLOCK_ON: + qca->rx_vote = true; + qca->rx_votes_on++; + new_vote = true; + break; + + case HCI_IBS_TX_VOTE_CLOCK_OFF: + qca->tx_vote = false; + qca->tx_votes_off++; + new_vote = qca->rx_vote | qca->tx_vote; + break; + + case HCI_IBS_RX_VOTE_CLOCK_OFF: + qca->rx_vote = false; + qca->rx_votes_off++; + new_vote = qca->rx_vote | qca->tx_vote; + break; + + default: + BT_ERR("voting irregularity"); + return; + } + + if (new_vote != old_vote) { + if (new_vote) +
__serial_clock_on(hu->tty); + else + __serial_clock_off(hu->tty); + + BT_DBG("HCIUART_IBS: vote serial clock %s(%s)", + new_vote? "true" : "false", + vote? "true" : "false"); + + /* debug */ + diff = jiffies_to_msecs(jiffies - qca->vote_last_jif); + + if (new_vote) { + qca->votes_on++; + qca->vote_off_ms += diff; + } else { + qca->votes_off++; + qca->vote_on_ms += diff; + } + qca->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 qca_data *qca = hu->priv; + + BT_DBG("hu %p send hci ibs 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"); + return -ENOMEM; + } + + /* prepare packet */ + *skb_put(skb, 1) = cmd; + + /* send packet */ + skb_queue_tail(&qca->txq, skb); + +
return err; +} + +static void qca_wq_awake_device(struct work_struct *work) +{ + struct qca_data *qca = container_of(work, struct qca_data, + ws_awake_device); + struct hci_uart *hu = qca->hu; + unsigned long retrans_delay; + + BT_DBG(" %p wq awake device", hu); + + /* Vote for serial clock */ + serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu); + + spin_lock(&qca->hci_ibs_lock); + + /* send wake indication to device */ + if (send_hci_ibs_cmd(HCI_IBS_WAKE_IND, hu) < 0) + BT_ERR("cannot send WAKE to device"); + + qca->ibs_sent_wakes++; /* debug */ + + /* start retransmit timer */ + retrans_delay = msecs_to_jiffies(wake_retrans); + mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay); + + spin_unlock(&qca->hci_ibs_lock); + + /* actually send the packets */ + hci_uart_tx_wakeup(hu); +} + +static void qca_wq_awake_rx(struct work_struct *work) +{ + struct qca_data *qca = container_of(work, struct qca_data, + ws_awake_rx); + struct hci_uart *hu = qca->hu; + + BT_DBG(" %p wq
awake rx", hu); + + serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu); + + spin_lock(&qca->hci_ibs_lock); + qca->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"); + + qca->ibs_sent_wacks++; /* debug */ + + spin_unlock(&qca->hci_ibs_lock); + + /* actually send the packets */ + hci_uart_tx_wakeup(hu); +} + +static void qca_wq_serial_rx_clock_vote_off(struct work_struct *work) +{ + struct qca_data *qca = container_of(work, struct qca_data, + ws_rx_vote_off); + struct hci_uart *hu = qca->hu; + + BT_DBG("hu %p rx clock vote off", hu); + + serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_OFF, hu); +} + +static void qca_wq_serial_tx_clock_vote_off(struct work_struct *work) +{ + struct qca_data *qca = container_of(work, struct qca_data, + ws_tx_vote_off); + struct hci_uart *hu = qca->hu; + + BT_DBG("hu %p tx clock vote
off", 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. + */ + 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 qca_data *qca = hu->priv; + unsigned long flags; + + BT_DBG("hu %p idle timeout in %hhu state", hu, qca->tx_ibs_state); + + spin_lock_irqsave_nested(&qca->hci_ibs_lock, + flags, SINGLE_DEPTH_NESTING); + + switch (qca->tx_ibs_state) { + 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"); + break; + } + qca->tx_ibs_state = HCI_IBS_TX_ASLEEP; + qca->ibs_sent_slps++; /* debug */ + queue_work(qca->workqueue, &qca->ws_tx_vote_off); + break; + + case HCI_IBS_TX_ASLEEP: + case HCI_IBS_TX_WAKING: + default: +
BT_ERR("spurious timeout in tx state %hhu", qca->tx_ibs_state); + break; + } + + spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); +} + +static void hci_ibs_wake_retrans_timeout(unsigned long arg) +{ + struct hci_uart *hu = (struct hci_uart *)arg; + struct qca_data *qca = hu->priv; + unsigned long flags, retrans_delay; + unsigned long retransmit = 0; + + BT_DBG("hu %p wake retransmit timeout in %hhu state", + hu, qca->tx_ibs_state); + + spin_lock_irqsave_nested(&qca->hci_ibs_lock, + flags, SINGLE_DEPTH_NESTING); + + switch (qca->tx_ibs_state) { + 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"); + break; + } + qca->ibs_sent_wakes++; /* debug */ + retrans_delay = msecs_to_jiffies(wake_retrans); + mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay); + break; + + case HCI_IBS_TX_ASLEEP: + case HCI_IBS_TX_AWAKE: + default: + BT_ERR("spurrious
timeout tx state %hhu", qca->tx_ibs_state); + break; + } + + spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); + + if (retransmit) + hci_uart_tx_wakeup(hu); +} + +/* Initialize protocol */ +static int qca_open(struct hci_uart *hu) +{ + struct qca_data *qca; + + BT_DBG("hu %p qca_open", hu); + + qca = kzalloc(sizeof(struct qca_data), GFP_ATOMIC); + if (!qca) + return -ENOMEM; + + skb_queue_head_init(&qca->txq); + skb_queue_head_init(&qca->tx_wait_q); + spin_lock_init(&qca->hci_ibs_lock); + qca->workqueue = create_singlethread_workqueue("qca_wq"); + if (!qca->workqueue) { + BT_ERR("QCA Workqueue not initialized properly"); + kfree(qca); + return -ENOMEM; + } + + INIT_WORK(&qca->ws_awake_rx, qca_wq_awake_rx); + INIT_WORK(&qca->ws_awake_device, qca_wq_awake_device); + INIT_WORK(&qca->ws_rx_vote_off, qca_wq_serial_rx_clock_vote_off); + INIT_WORK(&qca->ws_tx_vote_off, qca_wq_serial_tx_clock_vote_off); + + qca->hu = hu; + + /* Assume we start with both sides asleep -- extra wakes
OK */ + qca->tx_ibs_state = HCI_IBS_TX_ASLEEP; + qca->rx_ibs_state = HCI_IBS_RX_ASLEEP; + /* clocks actually on, but we start votes off */ + qca->tx_vote = false; + qca->rx_vote = false; + qca->flags = 0; + + /* debug */ + qca->ibs_sent_wacks = 0; + qca->ibs_sent_slps = 0; + qca->ibs_sent_wakes = 0; + qca->ibs_recv_wacks = 0; + qca->ibs_recv_slps = 0; + qca->ibs_recv_wakes = 0; + qca->vote_last_jif = jiffies; + qca->vote_on_ms = 0; + qca->vote_off_ms = 0; + qca->votes_on = 0; + qca->votes_off = 0; + qca->tx_votes_on = 0; + qca->tx_votes_off = 0; + qca->rx_votes_on = 0; + qca->rx_votes_off = 0; + + hu->priv = qca; + + init_timer(&qca->wake_retrans_timer); + qca->wake_retrans_timer.function = hci_ibs_wake_retrans_timeout; + qca->wake_retrans_timer.data = (u_long)hu; + wake_retrans = IBS_WAKE_RETRANS_TIMEOUT; + + init_timer(&qca->tx_idle_timer); + qca->tx_idle_timer.function = hci_ibs_tx_idle_timeout; + qca->tx_idle_timer.data = (u_long)hu; + tx_idle_delay = IBS_TX_IDLE_TIMEOUT;
+ + BT_INFO("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u", + tx_idle_delay, wake_retrans); + + return 0; +} + +static void qca_debugfs_init(struct hci_dev *hdev) +{ + struct hci_uart *hu = hci_get_drvdata(hdev); + struct qca_data *qca = hu->priv; + umode_t mode; + + if (!hdev->debugfs) + return; + + qca->ibs_dir = debugfs_create_dir("ibs", hdev->debugfs); + + /* read only */ + mode = S_IRUGO; + debugfs_create_u8("tx_ibs_state", mode, qca->ibs_dir, + &qca->tx_ibs_state); + debugfs_create_u8("rx_ibs_state", mode, qca->ibs_dir, + &qca->rx_ibs_state); + debugfs_create_u64("ibs_sent_sleeps", mode, qca->ibs_dir, + &qca->ibs_sent_slps); + debugfs_create_u64("ibs_sent_wakes", mode, qca->ibs_dir, + &qca->ibs_sent_wakes); + debugfs_create_u64("ibs_sent_wake_acks", mode, qca->ibs_dir, + &qca->ibs_sent_wacks); + debugfs_create_u64("ibs_recv_sleeps", mode, qca->ibs_dir, + &qca->ibs_recv_slps); + debugfs_create_u64("ibs_recv_wakes", mode, qca->ibs_dir, + &qca->ibs_recv_wakes); +
debugfs_create_u64("ibs_recv_wake_acks", mode, qca->ibs_dir, + &qca->ibs_recv_wacks); + debugfs_create_bool("tx_vote", mode, qca->ibs_dir, + (u32 *)&qca->tx_vote); + debugfs_create_u64("tx_votes_on", mode, qca->ibs_dir, + &qca->tx_votes_on); + debugfs_create_u64("tx_votes_off", mode, qca->ibs_dir, + &qca->tx_votes_off); + debugfs_create_bool("rx_vote", mode, qca->ibs_dir, + (u32 *)&qca->rx_vote); + debugfs_create_u64("rx_votes_on", mode, qca->ibs_dir, + &qca->rx_votes_on); + debugfs_create_u64("rx_votes_off", mode, qca->ibs_dir, + &qca->rx_votes_off); + debugfs_create_u64("votes_on", mode, qca->ibs_dir, &qca->votes_on); + debugfs_create_u64("votes_off", mode, qca->ibs_dir, &qca->votes_off); + debugfs_create_u32("vote_on_ms", mode, qca->ibs_dir, + &qca->vote_on_ms); + debugfs_create_u32("vote_off_ms", mode, qca->ibs_dir, + &qca->vote_off_ms); +} + +/* Flush protocol data */ +static int qca_flush(struct hci_uart *hu) +{ + struct qca_data *qca = hu->priv; + + BT_DBG("hu %p qca
flush", hu); + + skb_queue_purge(&qca->tx_wait_q); + skb_queue_purge(&qca->txq); + + return 0; +} + +/* Close protocol */ +static int qca_close(struct hci_uart *hu) +{ + struct qca_data *qca = hu->priv; + + BT_DBG("hu %p qca close", hu); + + serial_clock_vote(HCI_IBS_VOTE_STATS_UPDATE, hu); + + skb_queue_purge(&qca->tx_wait_q); + skb_queue_purge(&qca->txq); + del_timer(&qca->tx_idle_timer); + del_timer(&qca->wake_retrans_timer); + destroy_workqueue(qca->workqueue); + qca->hu = NULL; + + kfree_skb(qca->rx_skb); + + hu->priv = NULL; + + kfree(qca); + + return 0; +} + +/* + * Called upon a wake-up-indication from the device + */ +static void device_want_to_wakeup(struct hci_uart *hu) +{ + unsigned long flags; + struct qca_data *qca = hu->priv; + + BT_DBG("hu %p want to wake up", hu); + + spin_lock_irqsave(&qca->hci_ibs_lock, flags); + + /* debug */ + qca->ibs_recv_wakes++; + + switch (qca->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(qca->workqueue, &qca->ws_awake_rx); + spin_unlock_irqrestore(&qca->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"); + break; + } + qca->ibs_sent_wacks++; /* debug */ + break; + + default: + /* any other state is illegal */ + BT_ERR("received HCI_IBS_WAKE_IND in rx state %hhu", + qca->rx_ibs_state); + break; + } + + spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); + + /* actually send the packets */ + hci_uart_tx_wakeup(hu); +} + +/* + * Called upon a sleep-indication from the device + */ +static void device_want_to_sleep(struct hci_uart *hu) +{ + unsigned long flags; + struct qca_data *qca = hu->priv; + + BT_DBG("hu %p want to sleep", hu); + + spin_lock_irqsave(&qca->hci_ibs_lock, flags);
+ + /* debug */ + qca->ibs_recv_slps++; + + switch (qca->rx_ibs_state) { + case HCI_IBS_RX_AWAKE: + /* update state */ + qca->rx_ibs_state = HCI_IBS_RX_ASLEEP; + /* vote off rx clock under workqueue */ + queue_work(qca->workqueue, &qca->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 %hhu", + qca->rx_ibs_state); + break; + } + + spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); +} + +/* + * Called upon wake-up-acknowledgement from the device + */ +static void device_woke_up(struct hci_uart *hu) +{ + unsigned long flags, idle_delay; + struct qca_data *qca = hu->priv; + struct sk_buff *skb = NULL; + + BT_DBG("hu %p woke up", hu); + + spin_lock_irqsave(&qca->hci_ibs_lock, flags); + + /* debug */ + qca->ibs_recv_wacks++; + + switch (qca->tx_ibs_state) { + case HCI_IBS_TX_AWAKE: + /* expect one if we send 2 WAKEs */ + BT_DBG("received
HCI_IBS_WAKE_ACK in tx state %hhu", + qca->tx_ibs_state); + break; + + case HCI_IBS_TX_WAKING: + /* send pending packets */ + while ((skb = skb_dequeue(&qca->tx_wait_q))) + skb_queue_tail(&qca->txq, skb); + + /* switch timers and change state to HCI_IBS_TX_AWAKE */ + del_timer(&qca->wake_retrans_timer); + idle_delay = msecs_to_jiffies(tx_idle_delay); + mod_timer(&qca->tx_idle_timer, jiffies + idle_delay); + qca->tx_ibs_state = HCI_IBS_TX_AWAKE; + break; + + 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 %hhu", + qca->tx_ibs_state); + break; + } + + spin_unlock_irqrestore(&qca->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 qca_enqueue(struct hci_uart *hu, struct sk_buff
*skb) +{ + unsigned long flags = 0, idle_delay; + struct qca_data *qca = hu->priv; + + BT_DBG("hu %p qca enq skb %p tx_ibs_state %hhu", hu, skb, + qca->tx_ibs_state); + + /* Prepend skb with frame type */ + memcpy(skb_push(skb, 1), &bt_cb(skb)->pkt_type, 1); + + /* don't go to sleep in middle of patch download or + * Out-Of-Band(GPIOs control) sleep is selected + */ + if (!test_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags)) { + skb_queue_tail(&qca->txq, skb); + return 0; + } + + spin_lock_irqsave(&qca->hci_ibs_lock, flags); + + /* act according to current state */ + switch (qca->tx_ibs_state) { + case HCI_IBS_TX_AWAKE: + BT_DBG("device awake, sending normally"); + skb_queue_tail(&qca->txq, skb); + idle_delay = msecs_to_jiffies(tx_idle_delay); + mod_timer(&qca->tx_idle_timer, jiffies + idle_delay); + break; + + case HCI_IBS_TX_ASLEEP: + BT_DBG("device asleep, waking up and queueing packet"); + /* save packet for later */ + skb_queue_tail(&qca->tx_wait_q, skb); + +
qca->tx_ibs_state = HCI_IBS_TX_WAKING; + /* schedule a work queue to wake up device */ + queue_work(qca->workqueue, &qca->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(&qca->tx_wait_q, skb); + break; + + default: + BT_ERR("illegal tx state: %hhu (losing packet)", + qca->tx_ibs_state); + kfree_skb(skb); + break; + } + + spin_unlock_irqrestore(&qca->hci_ibs_lock, flags); + + return 0; +} + +#define QCA_IBS_SLEEP_IND_EVENT \ + .type = HCI_IBS_SLEEP_IND, \ + .hlen = 0, \ + .loff = 0, \ + .lsize = 0, \ + .maxlen = HCI_MAX_IBS_SIZE + +#define QCA_IBS_WAKE_IND_EVENT \ + .type = HCI_IBS_WAKE_IND, \ + .hlen = 0, \ + .loff = 0, \ + .lsize = 0, \ + .maxlen = HCI_MAX_IBS_SIZE + +#define QCA_IBS_WAKE_ACK_EVENT \ + .type = HCI_IBS_WAKE_ACK, \ + .hlen = 0, \ + .loff = 0, \ + .lsize = 0, \ + .maxlen = HCI_MAX_IBS_SIZE + +static int qca_ibs_recv_frame(struct hci_dev
*hdev, struct sk_buff *skb) +{ + struct hci_uart *hu = hci_get_drvdata(hdev); + u8 pkt_type; + + pkt_type = bt_cb(skb)->pkt_type; + + switch (pkt_type) { + case HCI_IBS_SLEEP_IND: + BT_DBG("HCI_IBS_SLEEP_IND packet"); + device_want_to_sleep(hu); + break; + + case HCI_IBS_WAKE_IND: + BT_DBG("HCI_IBS_WAKE_IND packet"); + device_want_to_wakeup(hu); + break; + + case HCI_IBS_WAKE_ACK: + BT_DBG("HCI_IBS_WAKE_ACK packet"); + device_woke_up(hu); + break; + + default: + BT_ERR("Unknown HCI packet type %2.2x", (__u8)*skb->data); + hdev->stat.err_rx++; + break; + } + + kfree_skb(skb); + return 0; +} + +static const struct h4_recv_pkt qca_recv_pkts[] = { + { H4_RECV_ACL, .recv = hci_recv_frame }, + { H4_RECV_SCO, .recv = hci_recv_frame }, + { H4_RECV_EVENT, .recv = hci_recv_frame }, + { QCA_IBS_WAKE_IND_EVENT, .recv = qca_ibs_recv_frame }, + { QCA_IBS_WAKE_ACK_EVENT, .recv = qca_ibs_recv_frame }, + { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_recv_frame }, +}; + +static int
qca_recv(struct hci_uart *hu, const void *data, int count) +{ + struct qca_data *qca = hu->priv; + + if (!test_bit(HCI_UART_REGISTERED, &hu->flags)) + return -EUNATCH; + + qca->rx_skb = h4_recv_buf(hu->hdev, qca->rx_skb, data, count, + qca_recv_pkts, ARRAY_SIZE(qca_recv_pkts)); + if (IS_ERR(qca->rx_skb)) { + int err = PTR_ERR(qca->rx_skb); + BT_ERR("%s: Frame reassembly failed (%d)", hu->hdev->name, err); + qca->rx_skb = NULL; + return err; + } + + return count; +} + +static struct sk_buff *qca_dequeue(struct hci_uart *hu) +{ + struct qca_data *qca = hu->priv; + + return skb_dequeue(&qca->txq); +} + +static uint8_t qca_get_baudrate_value(int speed) +{ + switch(speed) { + case 9600: + return QCA_BAUDRATE_9600; + case 19200: + return QCA_BAUDRATE_19200; + case 38400: + return QCA_BAUDRATE_38400; + case 57600: + return QCA_BAUDRATE_57600; + case 115200: + return QCA_BAUDRATE_115200; + case 230400: + return QCA_BAUDRATE_230400; + case 460800: + return QCA_BAUDRATE_460800; + case
500000: + return QCA_BAUDRATE_500000; + case 921600: + return QCA_BAUDRATE_921600; + case 1000000: + return QCA_BAUDRATE_1000000; + case 2000000: + return QCA_BAUDRATE_2000000; + case 3000000: + return QCA_BAUDRATE_3000000; + case 3500000: + return QCA_BAUDRATE_3500000; + default: + return QCA_BAUDRATE_115200; + } +} + +static int qca_set_baudrate(struct hci_dev *hdev, uint8_t baudrate) +{ + struct hci_uart *hu = hci_get_drvdata(hdev); + struct qca_data *qca = hu->priv; + struct sk_buff *skb; + u8 cmd[] = {0x01, 0x48, 0xFC, 0x01, 0x00}; + + if (baudrate > QCA_BAUDRATE_3000000) + return -EINVAL; + + cmd[4] = baudrate; + + /* allocate packet */ + skb = bt_skb_alloc(sizeof(cmd), GFP_ATOMIC); + if (!skb) { + BT_ERR("cannot allocate memory for baudrate packet"); + return -ENOMEM; + } + + /* prepare packet */ + memcpy(skb_put(skb, sizeof(cmd)), cmd, sizeof(cmd)); + bt_cb(skb)->pkt_type = HCI_COMMAND_PKT; + + /* send packet */ + skb_queue_tail(&qca->txq, skb); +
hci_uart_tx_wakeup(hu); + + /* wait 300ms to change new baudrate on controller side + * controller will come back after they receive this HCI command + * then host can communicate with new baudrate to controller + */ + set_current_state(TASK_UNINTERRUPTIBLE); + schedule_timeout(msecs_to_jiffies(BAUDRATE_SETTLE_TIMEOUT)); + set_current_state(TASK_INTERRUPTIBLE); + + return 0; +} + +static int qca_setup(struct hci_uart *hu) +{ + struct hci_dev *hdev = hu->hdev; + struct qca_data *qca = hu->priv; + unsigned int speed, qca_baudrate = QCA_BAUDRATE_115200; + int ret; + + BT_INFO("%s: ROME setup", hdev->name); + + /* Patch downloading has to be done without IBS mode */ + clear_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags); + + /* setup initial baudrate */ + speed = 0; + if (hu->init_speed) + speed = hu->init_speed; + else if (hu->proto->init_speed) + speed = hu->proto->init_speed; + + if (speed) + hci_uart_set_baudrate(hu, speed); + + /* setup user speed if needed */ + speed = 0; +
if (hu->oper_speed) + speed = hu->oper_speed; + else if (hu->proto->oper_speed) + speed = hu->proto->oper_speed; + + if (speed) { + qca_baudrate = qca_get_baudrate_value(speed); + + BT_INFO("%s: Set UART speed to %d", hdev->name, speed); + ret = qca_set_baudrate(hdev, qca_baudrate); + if (ret) { + BT_ERR("%s: can't change the baud rate (%d)", + hdev->name, ret); + return ret; + } + hci_uart_set_baudrate(hu, speed); + } + + /* setup patch / nvm configurations */ + ret = rome_uart_setup(hdev, qca_baudrate); +#ifdef QCA_FEATURE_UART_IN_BAND_SLEEP + if (!ret) { + set_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags); +#ifdef CONFIG_DEBUG_FS + qca_debugfs_init(hdev); +#endif + } +#endif + /* setup bdaddr */ + hu->hdev->set_bdaddr = rome_set_bdaddr; + + return ret; +} + +static struct hci_uart_proto qca_p = { + .id = HCI_UART_QCA, + .name = "QCA", + .open = qca_open, + .init_speed = 115200, + .oper_speed = 3000000, + .close = qca_close, + .recv = qca_recv, + .enqueue = qca_enqueue, +
.dequeue = qca_dequeue, + .flush = qca_flush, + .setup = qca_setup, +}; + +int __init qca_init(void) +{ + return hci_uart_register_proto(&qca_p); +} + +int __exit qca_deinit(void) +{ + return hci_uart_unregister_proto(&qca_p); +} + +module_param(wake_retrans, uint, 0644); +MODULE_PARM_DESC(wake_retrans, "Delay ms to retransmit WAKE_IND"); + +module_param(tx_idle_delay, uint, 0644); +MODULE_PARM_DESC(tx_idle_delay, "Delay ms since last tx for SLEEP_IND"); diff --git a/drivers/bluetooth/hci_uart.h b/drivers/bluetooth/hci_uart.h index 496587a..495b9ef 100644 --- a/drivers/bluetooth/hci_uart.h +++ b/drivers/bluetooth/hci_uart.h @@ -35,7 +35,7 @@ #define HCIUARTGETFLAGS _IOR('U', 204, int) /* UART protocols */ -#define HCI_UART_MAX_PROTO 8 +#define HCI_UART_MAX_PROTO 9 #define HCI_UART_H4 0 #define HCI_UART_BCSP 1 @@ -45,6 +45,7 @@ #define HCI_UART_ATH3K 5 #define HCI_UART_INTEL 6 #define HCI_UART_BCM 7 +#define HCI_UART_QCA 8 #define HCI_UART_RAW_DEVICE 0 #define
HCI_UART_RESET_ON_INIT 1 @@ -176,3 +177,8 @@ int intel_deinit(void); int bcm_init(void); int bcm_deinit(void); #endif + +#ifdef CONFIG_BT_HCIUART_QCA +int qca_init(void); +int qca_deinit(void); +#endif -- 2.0.5
--
To unsubscribe from this list: send the line "unsubscribe linux-bluetooth" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
