--- /dev/null
+/*
+ * 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@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/kernel.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_MS 100
+#define IBS_TX_IDLE_TIMEOUT_MS 2000
+#define BAUDRATE_SETTLE_TIMEOUT_MS 300
+
+/* HCI_IBS transmit side sleep protocol states */
+enum tx_ibs_states {
+ HCI_IBS_TX_ASLEEP,
+ HCI_IBS_TX_WAKING,
+ HCI_IBS_TX_AWAKE,
+};
+
+/* HCI_IBS receive side sleep protocol states */
+enum rx_states {
+ HCI_IBS_RX_ASLEEP,
+ HCI_IBS_RX_AWAKE,
+};
+
+/* HCI_IBS transmit and receive side clock state vote */
+enum hci_ibs_clock_state_vote {
+ 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,
+};
+
+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;
+ u32 tx_idle_delay;
+ struct timer_list wake_retrans_timer;
+ u32 wake_retrans;
+ 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;
+ unsigned long flags;
+
+ /* For debugging purpose */
+ 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
+ */
+}
+
+/* serial_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("Vote serial clock %s(%s)", new_vote? "true" : "false",
+ vote? "true" : "false");
+
+ 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);
+
+ skb = bt_skb_alloc(1, GFP_ATOMIC);
+ if (!skb) {
+ BT_ERR("Failed to allocate memory for HCI_IBS packet");
+ return -ENOMEM;
+ }
+
+ /* Assign HCI_IBS type */
+ *skb_put(skb, 1) = cmd;
+
+ 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("hu %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("Failed to send WAKE to device");
+
+ qca->ibs_sent_wakes++;
+
+ /* Start retransmit timer */
+ retrans_delay = msecs_to_jiffies(qca->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("hu %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("Failed to acknowledge device wake up");
+
+ qca->ibs_sent_wacks++;
+
+ 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);
+
+ /* Run HCI tx handling unlocked */
+ hci_uart_tx_wakeup(hu);
+
+ /* 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 %d 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("Failed to send SLEEP to device");
+ break;
+ }
+ qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
+ qca->ibs_sent_slps++;
+ queue_work(qca->workqueue, &qca->ws_tx_vote_off);
+ break;
+
+ case HCI_IBS_TX_ASLEEP:
+ case HCI_IBS_TX_WAKING:
+ /* Fall through */
+
+ default:
+ BT_ERR("Spurrious timeout tx state %d", 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 %d 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("Failed to acknowledge device wake up");
+ break;
+ }
+ qca->ibs_sent_wakes++;
+ retrans_delay = msecs_to_jiffies(qca->wake_retrans);
+ mod_timer(&qca->wake_retrans_timer, jiffies + retrans_delay);
+ break;
+
+ case HCI_IBS_TX_ASLEEP:
+ case HCI_IBS_TX_AWAKE:
+ /* Fall through */
+
+ default:
+ BT_ERR("Spurrious timeout tx state %d", 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;
+
+ 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;
+ qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;
+
+ init_timer(&qca->tx_idle_timer);
+ qca->tx_idle_timer.function = hci_ibs_tx_idle_timeout;
+ qca->tx_idle_timer.data = (u_long)hu;
+ qca->tx_idle_delay = IBS_TX_IDLE_TIMEOUT_MS;
+
+ BT_DBG("HCI_UART_QCA open, tx_idle_delay=%u, wake_retrans=%u",
+ qca->tx_idle_delay, qca->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;
+ struct dentry *ibs_dir;
+ umode_t mode;
+
+ if (!hdev->debugfs)
+ return;
+
+ ibs_dir = debugfs_create_dir("ibs", hdev->debugfs);
+
+ /* read only */
+ mode = S_IRUGO;
+ debugfs_create_u8("tx_ibs_state", mode, ibs_dir, &qca->tx_ibs_state);
+ debugfs_create_u8("rx_ibs_state", mode, ibs_dir, &qca->rx_ibs_state);
+ debugfs_create_u64("ibs_sent_sleeps", mode, ibs_dir,
+ &qca->ibs_sent_slps);
+ debugfs_create_u64("ibs_sent_wakes", mode, ibs_dir,
+ &qca->ibs_sent_wakes);
+ debugfs_create_u64("ibs_sent_wake_acks", mode, ibs_dir,
+ &qca->ibs_sent_wacks);
+ debugfs_create_u64("ibs_recv_sleeps", mode, ibs_dir,
+ &qca->ibs_recv_slps);
+ debugfs_create_u64("ibs_recv_wakes", mode, ibs_dir,
+ &qca->ibs_recv_wakes);
+ debugfs_create_u64("ibs_recv_wake_acks", mode, ibs_dir,
+ &qca->ibs_recv_wacks);
+ debugfs_create_bool("tx_vote", mode, ibs_dir, (u32 *)&qca->tx_vote);
+ debugfs_create_u64("tx_votes_on", mode, ibs_dir, &qca->tx_votes_on);
+ debugfs_create_u64("tx_votes_off", mode, ibs_dir, &qca->tx_votes_off);
+ debugfs_create_bool("rx_vote", mode, ibs_dir, (u32 *)&qca->rx_vote);
+ debugfs_create_u64("rx_votes_on", mode, ibs_dir, &qca->rx_votes_on);
+ debugfs_create_u64("rx_votes_off", mode, ibs_dir, &qca->rx_votes_off);
+ debugfs_create_u64("votes_on", mode, ibs_dir, &qca->votes_on);
+ debugfs_create_u64("votes_off", mode, ibs_dir, &qca->votes_off);
+ debugfs_create_u32("vote_on_ms", mode, ibs_dir, &qca->vote_on_ms);
+ debugfs_create_u32("vote_off_ms", mode, ibs_dir, &qca->vote_off_ms);
+
+ /* read/write */
+ mode = S_IRUGO | S_IWUSR;
+ debugfs_create_u32("wake_retrans", mode, ibs_dir, &qca->wake_retrans);
+ debugfs_create_u32("tx_idle_delay", mode, ibs_dir,
+ &qca->tx_idle_delay);
+}
+
+/* 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);
+
+ 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("Failed to acknowledge device wake up");
+ break;
+ }
+ qca->ibs_sent_wacks++;
+ break;
+
+ default:
+ /* Any other state is illegal */
+ BT_ERR("Received HCI_IBS_WAKE_IND in rx state %d",
+ 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);
+
+ 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:
+ /* Fall through */
+
+ default:
+ /* Any other state is illegal */
+ BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d",
+ 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);
+
+ 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 %d",
+ 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(qca->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:
+ /* Fall through */
+
+ default:
+ BT_ERR("Received HCI_IBS_WAKE_ACK in tx state %d",
+ 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 %d", 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(qca->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: %d (losing packet)",
+ qca->tx_ibs_state);
+ kfree_skb(skb);
+ break;
+ }
+
+ spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
+
+ return 0;
+}
+
+static int qca_ibs_sleep_ind(struct hci_dev *hdev, struct sk_buff *skb)
+{
+ struct hci_uart *hu = hci_get_drvdata(hdev);
+
+ BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_SLEEP_IND);
+
+ device_want_to_sleep(hu);
+
+ kfree_skb(skb);
+ return 0;
+}
+
+static int qca_ibs_wake_ind(struct hci_dev *hdev, struct sk_buff *skb)
+{
+ struct hci_uart *hu = hci_get_drvdata(hdev);
+
+ BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_IND);
+
+ device_want_to_wakeup(hu);
+
+ kfree_skb(skb);
+ return 0;
+}
+
+static int qca_ibs_wake_ack(struct hci_dev *hdev, struct sk_buff *skb)
+{
+ struct hci_uart *hu = hci_get_drvdata(hdev);
+
+ BT_DBG("hu %p recv hci ibs cmd 0x%x", hu, HCI_IBS_WAKE_ACK);
+
+ device_woke_up(hu);
+
+ kfree_skb(skb);
+ 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 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_wake_ind },
+ { QCA_IBS_WAKE_ACK_EVENT, .recv = qca_ibs_wake_ack },
+ { QCA_IBS_SLEEP_IND_EVENT, .recv = qca_ibs_sleep_ind },
+};
+
+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;
+
+ skb = bt_skb_alloc(sizeof(cmd), GFP_ATOMIC);
+ if (!skb) {
+ BT_ERR("Failed to allocate memory for baudrate packet");
+ return -ENOMEM;
+ }
+
+ /* Assign commands to change baudrate and packet type. */
+ memcpy(skb_put(skb, sizeof(cmd)), cmd, sizeof(cmd));
+ bt_cb(skb)->pkt_type = HCI_COMMAND_PKT;
+
+ 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_MS));
+ 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: Failed to change the baud rate (%d)",
+ hdev->name, ret);
+ return ret;
+ }
+ hci_uart_set_baudrate(hu, speed);
+ }
+
+ /* Setup patch / NVM configurations */
+ ret = qca_uart_setup_rome(hdev, qca_baudrate);
+ if (!ret) {
+ set_bit(STATE_IN_BAND_SLEEP_ENABLED, &qca->flags);
+ qca_debugfs_init(hdev);
+ }
+
+ /* Setup bdaddr */
+ hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
+
+ return ret;
+}
+
+static struct hci_uart_proto qca_proto = {
+ .id = HCI_UART_QCA,
+ .name = "QCA",
+ .init_speed = 115200,
+ .oper_speed = 3000000,
+ .open = qca_open,
+ .close = qca_close,
+ .flush = qca_flush,
+ .setup = qca_setup,
+ .recv = qca_recv,
+ .enqueue = qca_enqueue,
+ .dequeue = qca_dequeue,
+};
+
+int __init qca_init(void)
+{
+ return hci_uart_register_proto(&qca_proto);
+}
+
+int __exit qca_deinit(void)
+{
+ return hci_uart_unregister_proto(&qca_proto);
+}
projects / platform / kernel / linux-exynos.git / commitdiff