// SPDX-License-Identifier: GPL-2.0-only
/*
 *  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, 2018 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.
 */

#include <linux/kernel.h>
#include <linux/clk.h>
#include <linux/completion.h>
#include <linux/debugfs.h>
#include <linux/delay.h>
#include <linux/devcoredump.h>
#include <linux/device.h>
#include <linux/gpio/consumer.h>
#include <linux/mod_devicetable.h>
#include <linux/module.h>
#include <linux/of.h>
#include <linux/acpi.h>
#include <linux/platform_device.h>
#include <linux/pwrseq/consumer.h>
#include <linux/regulator/consumer.h>
#include <linux/serdev.h>
#include <linux/string_choices.h>
#include <linux/mutex.h>
#include <linux/unaligned.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

#define IBS_WAKE_RETRANS_TIMEOUT_MS     100
#define IBS_BTSOC_TX_IDLE_TIMEOUT_MS    200
#define IBS_HOST_TX_IDLE_TIMEOUT_MS     2000
#define CMD_TRANS_TIMEOUT_MS            100
#define MEMDUMP_TIMEOUT_MS              8000
#define IBS_DISABLE_SSR_TIMEOUT_MS \
        (MEMDUMP_TIMEOUT_MS + FW_DOWNLOAD_TIMEOUT_MS)
#define FW_DOWNLOAD_TIMEOUT_MS          3000

/* susclk rate */
#define SUSCLK_RATE_32KHZ       32768

/* Controller debug log header */
#define QCA_DEBUG_HANDLE        0x2EDC

/* max retry count when init fails */
#define MAX_INIT_RETRIES 3

/* Controller dump header */
#define QCA_SSR_DUMP_HANDLE             0x0108
#define QCA_DUMP_PACKET_SIZE            255
#define QCA_LAST_SEQUENCE_NUM           0xFFFF
#define QCA_CRASHBYTE_PACKET_LEN        1096
#define QCA_MEMDUMP_BYTE                0xFB

enum qca_flags {
        QCA_IBS_DISABLED,
        QCA_DROP_VENDOR_EVENT,
        QCA_SUSPENDING,
        QCA_MEMDUMP_COLLECTION,
        QCA_HW_ERROR_EVENT,
        QCA_SSR_TRIGGERED,
        QCA_BT_OFF,
        QCA_ROM_FW,
        QCA_DEBUGFS_CREATED,
};

enum qca_capabilities {
        QCA_CAP_WIDEBAND_SPEECH = BIT(0),
        QCA_CAP_VALID_LE_STATES = BIT(1),
        QCA_CAP_HFP_HW_OFFLOAD  = BIT(2),
};

/* 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,
};

/* Controller memory dump states */
enum qca_memdump_states {
        QCA_MEMDUMP_IDLE,
        QCA_MEMDUMP_COLLECTING,
        QCA_MEMDUMP_COLLECTED,
        QCA_MEMDUMP_TIMEOUT,
};

struct qca_memdump_info {
        u32 current_seq_no;
        u32 received_dump;
        u32 ram_dump_size;
};

struct qca_memdump_event_hdr {
        __u8    evt;
        __u8    plen;
        __u16   opcode;
        __le16   seq_no;
        __u8    reserved;
} __packed;


struct qca_dump_size {
        __le32 dump_size;
} __packed;

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   */
        struct sk_buff_head rx_memdump_q;       /* Memdump 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;
        struct work_struct ctrl_memdump_evt;
        struct delayed_work ctrl_memdump_timeout;
        struct qca_memdump_info *qca_memdump;
        unsigned long flags;
        struct completion drop_ev_comp;
        wait_queue_head_t suspend_wait_q;
        enum qca_memdump_states memdump_state;
        struct mutex hci_memdump_lock;

        u16 fw_version;
        u16 controller_id;
        /* 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;
};

enum qca_speed_type {
        QCA_INIT_SPEED = 1,
        QCA_OPER_SPEED
};

/*
 * Voltage regulator information required for configuring the
 * QCA Bluetooth chipset
 */
struct qca_vreg {
        const char *name;
        unsigned int load_uA;
};

struct qca_device_data {
        enum qca_btsoc_type soc_type;
        struct qca_vreg *vregs;
        size_t num_vregs;
        uint32_t capabilities;
};

/*
 * Platform data for the QCA Bluetooth power driver.
 */
struct qca_power {
        struct device *dev;
        struct regulator_bulk_data *vreg_bulk;
        int num_vregs;
        bool vregs_on;
        struct pwrseq_desc *pwrseq;
};

struct qca_serdev {
        struct hci_uart  serdev_hu;
        struct gpio_desc *bt_en;
        struct gpio_desc *sw_ctrl;
        struct clk       *susclk;
        enum qca_btsoc_type btsoc_type;
        struct qca_power *bt_power;
        u32 init_speed;
        u32 oper_speed;
        bool bdaddr_property_broken;
        bool support_hfp_hw_offload;
        const char *firmware_name[2];
};

static int qca_regulator_enable(struct qca_serdev *qcadev);
static void qca_regulator_disable(struct qca_serdev *qcadev);
static void qca_power_shutdown(struct hci_uart *hu);
static int qca_power_off(struct hci_dev *hdev);
static void qca_controller_memdump(struct work_struct *work);
static void qca_dmp_hdr(struct hci_dev *hdev, struct sk_buff *skb);

static enum qca_btsoc_type qca_soc_type(struct hci_uart *hu)
{
        enum qca_btsoc_type soc_type;

        if (hu->serdev) {
                struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);

                soc_type = qsd->btsoc_type;
        } else {
                soc_type = QCA_ROME;
        }

        return soc_type;
}

static const char *qca_get_firmware_name(struct hci_uart *hu)
{
        if (hu->serdev) {
                struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);

                return qsd->firmware_name[0];
        } else {
                return NULL;
        }
}

static const char *qca_get_rampatch_name(struct hci_uart *hu)
{
        if (hu->serdev) {
                struct qca_serdev *qsd = serdev_device_get_drvdata(hu->serdev);

                return qsd->firmware_name[1];
        } else {
                return NULL;
        }
}

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++;
                break;

        case HCI_IBS_RX_VOTE_CLOCK_ON:
                qca->rx_vote = true;
                qca->rx_votes_on++;
                break;

        case HCI_IBS_TX_VOTE_CLOCK_OFF:
                qca->tx_vote = false;
                qca->tx_votes_off++;
                break;

        case HCI_IBS_RX_VOTE_CLOCK_OFF:
                qca->rx_vote = false;
                qca->rx_votes_off++;
                break;

        default:
                BT_ERR("Voting irregularity");
                return;
        }

        new_vote = qca->rx_vote | qca->tx_vote;

        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)", str_true_false(new_vote),
                       str_true_false(vote));

                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_u8(skb, 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;
        unsigned long flags;

        BT_DBG("hu %p wq awake device", hu);

        /* Vote for serial clock */
        serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_ON, hu);

        spin_lock_irqsave(&qca->hci_ibs_lock, flags);

        /* 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_irqrestore(&qca->hci_ibs_lock, flags);

        /* 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;
        unsigned long flags;

        BT_DBG("hu %p wq awake rx", hu);

        serial_clock_vote(HCI_IBS_RX_VOTE_CLOCK_ON, hu);

        spin_lock_irqsave(&qca->hci_ibs_lock, flags);
        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_irqrestore(&qca->hci_ibs_lock, flags);

        /* 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(struct timer_list *t)
{
        struct qca_data *qca = timer_container_of(qca, t, tx_idle_timer);
        struct hci_uart *hu = qca->hu;
        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:
        default:
                BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
                break;
        }

        spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
}

static void hci_ibs_wake_retrans_timeout(struct timer_list *t)
{
        struct qca_data *qca = timer_container_of(qca, t, wake_retrans_timer);
        struct hci_uart *hu = qca->hu;
        unsigned long flags, retrans_delay;
        bool retransmit = false;

        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);

        /* Don't retransmit the HCI_IBS_WAKE_IND when suspending. */
        if (test_bit(QCA_SUSPENDING, &qca->flags)) {
                spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
                return;
        }

        switch (qca->tx_ibs_state) {
        case HCI_IBS_TX_WAKING:
                /* No WAKE_ACK, retransmit WAKE */
                retransmit = true;
                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:
        default:
                BT_ERR("Spurious timeout tx state %d", qca->tx_ibs_state);
                break;
        }

        spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);

        if (retransmit)
                hci_uart_tx_wakeup(hu);
}


static void qca_controller_memdump_timeout(struct work_struct *work)
{
        struct qca_data *qca = container_of(work, struct qca_data,
                                        ctrl_memdump_timeout.work);
        struct hci_uart *hu = qca->hu;

        mutex_lock(&qca->hci_memdump_lock);
        if (test_bit(QCA_MEMDUMP_COLLECTION, &qca->flags)) {
                qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
                if (!test_bit(QCA_HW_ERROR_EVENT, &qca->flags)) {
                        /* Inject hw error event to reset the device
                         * and driver.
                         */
                        hci_reset_dev(hu->hdev);
                }
        }

        mutex_unlock(&qca->hci_memdump_lock);
}


/* Initialize protocol */
static int qca_open(struct hci_uart *hu)
{
        struct qca_serdev *qcadev;
        struct qca_data *qca;

        BT_DBG("hu %p qca_open", hu);

        if (!hci_uart_has_flow_control(hu))
                return -EOPNOTSUPP;

        qca = kzalloc_obj(*qca);
        if (!qca)
                return -ENOMEM;

        skb_queue_head_init(&qca->txq);
        skb_queue_head_init(&qca->tx_wait_q);
        skb_queue_head_init(&qca->rx_memdump_q);
        spin_lock_init(&qca->hci_ibs_lock);
        mutex_init(&qca->hci_memdump_lock);
        qca->workqueue = alloc_ordered_workqueue("qca_wq", 0);
        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);
        INIT_WORK(&qca->ctrl_memdump_evt, qca_controller_memdump);
        INIT_DELAYED_WORK(&qca->ctrl_memdump_timeout,
                          qca_controller_memdump_timeout);
        init_waitqueue_head(&qca->suspend_wait_q);

        qca->hu = hu;
        init_completion(&qca->drop_ev_comp);

        /* 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;

        qca->vote_last_jif = jiffies;

        hu->priv = qca;

        if (hu->serdev) {
                qcadev = serdev_device_get_drvdata(hu->serdev);

                switch (qcadev->btsoc_type) {
                case QCA_WCN3950:
                case QCA_WCN3988:
                case QCA_WCN3990:
                case QCA_WCN3991:
                case QCA_WCN3998:
                case QCA_WCN6750:
                        hu->init_speed = qcadev->init_speed;
                        break;

                default:
                        break;
                }

                if (qcadev->oper_speed)
                        hu->oper_speed = qcadev->oper_speed;
        }

        timer_setup(&qca->wake_retrans_timer, hci_ibs_wake_retrans_timeout, 0);
        qca->wake_retrans = IBS_WAKE_RETRANS_TIMEOUT_MS;

        timer_setup(&qca->tx_idle_timer, hci_ibs_tx_idle_timeout, 0);
        qca->tx_idle_delay = IBS_HOST_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;

        if (test_and_set_bit(QCA_DEBUGFS_CREATED, &qca->flags))
                return;

        ibs_dir = debugfs_create_dir("ibs", hdev->debugfs);

        /* read only */
        mode = 0444;
        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, &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, &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 = 0644;
        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);
        skb_queue_purge(&qca->rx_memdump_q);
        /*
         * Shut the timers down so they can't be rearmed when
         * destroy_workqueue() drains pending work which in turn might try
         * to arm a timer.  After shutdown rearm attempts are silently
         * ignored by the timer core code.
         */
        timer_shutdown_sync(&qca->tx_idle_timer);
        timer_shutdown_sync(&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++;

        /* Don't wake the rx up when suspending. */
        if (test_bit(QCA_SUSPENDING, &qca->flags)) {
                spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
                return;
        }

        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 in %d state", hu, qca->rx_ibs_state);

        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:
                break;

        default:
                /* Any other state is illegal */
                BT_ERR("Received HCI_IBS_SLEEP_IND in rx state %d",
                       qca->rx_ibs_state);
                break;
        }

        wake_up_interruptible(&qca->suspend_wait_q);

        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++;

        /* Don't react to the wake-up-acknowledgment when suspending. */
        if (test_bit(QCA_SUSPENDING, &qca->flags)) {
                spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
                return;
        }

        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 */
                timer_delete(&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:
        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 transmission (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);

        if (test_bit(QCA_SSR_TRIGGERED, &qca->flags)) {
                /* As SSR is in progress, ignore the packets */
                bt_dev_dbg(hu->hdev, "SSR is in progress");
                kfree_skb(skb);
                return 0;
        }

        /* Prepend skb with frame type */
        memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);

        spin_lock_irqsave(&qca->hci_ibs_lock, flags);

        /* Don't go to sleep in middle of patch download or
         * Out-Of-Band(GPIOs control) sleep is selected.
         * Don't wake the device up when suspending.
         */
        if (test_bit(QCA_IBS_DISABLED, &qca->flags) ||
            test_bit(QCA_SUSPENDING, &qca->flags)) {
                skb_queue_tail(&qca->txq, skb);
                spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);
                return 0;
        }

        /* 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);
                dev_kfree_skb_irq(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;
}

static int qca_recv_acl_data(struct hci_dev *hdev, struct sk_buff *skb)
{
        /* We receive debug logs from chip as an ACL packets.
         * Instead of sending the data to ACL to decode the
         * received data, we are pushing them to the above layers
         * as a diagnostic packet.
         */
        if (get_unaligned_le16(skb->data) == QCA_DEBUG_HANDLE)
                return hci_recv_diag(hdev, skb);

        return hci_recv_frame(hdev, skb);
}

static void qca_dmp_hdr(struct hci_dev *hdev, struct sk_buff *skb)
{
        struct hci_uart *hu = hci_get_drvdata(hdev);
        struct qca_data *qca = hu->priv;
        char buf[80];

        snprintf(buf, sizeof(buf), "Controller Name: 0x%x\n",
                qca->controller_id);
        skb_put_data(skb, buf, strlen(buf));

        snprintf(buf, sizeof(buf), "Firmware Version: 0x%x\n",
                qca->fw_version);
        skb_put_data(skb, buf, strlen(buf));

        snprintf(buf, sizeof(buf), "Vendor:Qualcomm\n");
        skb_put_data(skb, buf, strlen(buf));

        snprintf(buf, sizeof(buf), "Driver: %s\n",
                hu->serdev->dev.driver->name);
        skb_put_data(skb, buf, strlen(buf));
}

static void qca_controller_memdump(struct work_struct *work)
{
        struct qca_data *qca = container_of(work, struct qca_data,
                                            ctrl_memdump_evt);
        struct hci_uart *hu = qca->hu;
        struct sk_buff *skb;
        struct qca_memdump_event_hdr *cmd_hdr;
        struct qca_memdump_info *qca_memdump = qca->qca_memdump;
        struct qca_dump_size *dump;
        u16 seq_no;
        u32 rx_size;
        int ret = 0;
        enum qca_btsoc_type soc_type = qca_soc_type(hu);

        while ((skb = skb_dequeue(&qca->rx_memdump_q))) {

                mutex_lock(&qca->hci_memdump_lock);
                /* Skip processing the received packets if timeout detected
                 * or memdump collection completed.
                 */
                if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT ||
                    qca->memdump_state == QCA_MEMDUMP_COLLECTED) {
                        mutex_unlock(&qca->hci_memdump_lock);
                        return;
                }

                if (!qca_memdump) {
                        qca_memdump = kzalloc_obj(*qca_memdump, GFP_ATOMIC);
                        if (!qca_memdump) {
                                mutex_unlock(&qca->hci_memdump_lock);
                                return;
                        }

                        qca->qca_memdump = qca_memdump;
                }

                qca->memdump_state = QCA_MEMDUMP_COLLECTING;
                cmd_hdr = (void *) skb->data;
                seq_no = __le16_to_cpu(cmd_hdr->seq_no);
                skb_pull(skb, sizeof(struct qca_memdump_event_hdr));

                if (!seq_no) {

                        /* This is the first frame of memdump packet from
                         * the controller, Disable IBS to receive dump
                         * with out any interruption, ideally time required for
                         * the controller to send the dump is 8 seconds. let us
                         * start timer to handle this asynchronous activity.
                         */
                        set_bit(QCA_IBS_DISABLED, &qca->flags);
                        set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
                        dump = (void *) skb->data;
                        qca_memdump->ram_dump_size = __le32_to_cpu(dump->dump_size);
                        if (!(qca_memdump->ram_dump_size)) {
                                bt_dev_err(hu->hdev, "Rx invalid memdump size");
                                kfree(qca_memdump);
                                kfree_skb(skb);
                                mutex_unlock(&qca->hci_memdump_lock);
                                return;
                        }

                        queue_delayed_work(qca->workqueue,
                                           &qca->ctrl_memdump_timeout,
                                           msecs_to_jiffies(MEMDUMP_TIMEOUT_MS));
                        skb_pull(skb, sizeof(qca_memdump->ram_dump_size));
                        qca_memdump->current_seq_no = 0;
                        qca_memdump->received_dump = 0;
                        ret = hci_devcd_init(hu->hdev, qca_memdump->ram_dump_size);
                        bt_dev_info(hu->hdev, "hci_devcd_init Return:%d",
                                    ret);
                        if (ret < 0) {
                                kfree(qca->qca_memdump);
                                qca->qca_memdump = NULL;
                                qca->memdump_state = QCA_MEMDUMP_COLLECTED;
                                cancel_delayed_work(&qca->ctrl_memdump_timeout);
                                clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
                                clear_bit(QCA_IBS_DISABLED, &qca->flags);
                                mutex_unlock(&qca->hci_memdump_lock);
                                return;
                        }

                        bt_dev_info(hu->hdev, "QCA collecting dump of size:%u",
                                    qca_memdump->ram_dump_size);

                }

                /* If sequence no 0 is missed then there is no point in
                 * accepting the other sequences.
                 */
                if (!test_bit(QCA_MEMDUMP_COLLECTION, &qca->flags)) {
                        bt_dev_err(hu->hdev, "QCA: Discarding other packets");
                        kfree(qca_memdump);
                        kfree_skb(skb);
                        mutex_unlock(&qca->hci_memdump_lock);
                        return;
                }
                /* There could be chance of missing some packets from
                 * the controller. In such cases let us store the dummy
                 * packets in the buffer.
                 */
                /* For QCA6390, controller does not lost packets but
                 * sequence number field of packet sometimes has error
                 * bits, so skip this checking for missing packet.
                 */
                while ((seq_no > qca_memdump->current_seq_no + 1) &&
                        (soc_type != QCA_QCA6390) &&
                        seq_no != QCA_LAST_SEQUENCE_NUM) {
                        bt_dev_err(hu->hdev, "QCA controller missed packet:%d",
                                   qca_memdump->current_seq_no);
                        rx_size = qca_memdump->received_dump;
                        rx_size += QCA_DUMP_PACKET_SIZE;
                        if (rx_size > qca_memdump->ram_dump_size) {
                                bt_dev_err(hu->hdev,
                                           "QCA memdump received %d, no space for missed packet",
                                           qca_memdump->received_dump);
                                break;
                        }
                        hci_devcd_append_pattern(hu->hdev, 0x00,
                                QCA_DUMP_PACKET_SIZE);
                        qca_memdump->received_dump += QCA_DUMP_PACKET_SIZE;
                        qca_memdump->current_seq_no++;
                }

                rx_size = qca_memdump->received_dump  + skb->len;
                if (rx_size <= qca_memdump->ram_dump_size) {
                        if ((seq_no != QCA_LAST_SEQUENCE_NUM) &&
                            (seq_no != qca_memdump->current_seq_no)) {
                                bt_dev_err(hu->hdev,
                                           "QCA memdump unexpected packet %d",
                                           seq_no);
                        }
                        bt_dev_dbg(hu->hdev,
                                   "QCA memdump packet %d with length %d",
                                   seq_no, skb->len);
                        hci_devcd_append(hu->hdev, skb);
                        qca_memdump->current_seq_no += 1;
                        qca_memdump->received_dump = rx_size;
                } else {
                        bt_dev_err(hu->hdev,
                                   "QCA memdump received no space for packet %d",
                                    qca_memdump->current_seq_no);
                }

                if (seq_no == QCA_LAST_SEQUENCE_NUM) {
                        bt_dev_info(hu->hdev,
                                "QCA memdump Done, received %d, total %d",
                                qca_memdump->received_dump,
                                qca_memdump->ram_dump_size);
                        hci_devcd_complete(hu->hdev);
                        cancel_delayed_work(&qca->ctrl_memdump_timeout);
                        kfree(qca->qca_memdump);
                        qca->qca_memdump = NULL;
                        qca->memdump_state = QCA_MEMDUMP_COLLECTED;
                        clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
                }

                mutex_unlock(&qca->hci_memdump_lock);
        }

}

static int qca_controller_memdump_event(struct hci_dev *hdev,
                                        struct sk_buff *skb)
{
        struct hci_uart *hu = hci_get_drvdata(hdev);
        struct qca_data *qca = hu->priv;

        set_bit(QCA_SSR_TRIGGERED, &qca->flags);
        skb_queue_tail(&qca->rx_memdump_q, skb);
        queue_work(qca->workqueue, &qca->ctrl_memdump_evt);

        return 0;
}

static int qca_recv_event(struct hci_dev *hdev, struct sk_buff *skb)
{
        struct hci_uart *hu = hci_get_drvdata(hdev);
        struct qca_data *qca = hu->priv;

        if (test_bit(QCA_DROP_VENDOR_EVENT, &qca->flags)) {
                struct hci_event_hdr *hdr = (void *)skb->data;

                /* For the WCN3990 the vendor command for a baudrate change
                 * isn't sent as synchronous HCI command, because the
                 * controller sends the corresponding vendor event with the
                 * new baudrate. The event is received and properly decoded
                 * after changing the baudrate of the host port. It needs to
                 * be dropped, otherwise it can be misinterpreted as
                 * response to a later firmware download command (also a
                 * vendor command).
                 */

                if (hdr->evt == HCI_EV_VENDOR)
                        complete(&qca->drop_ev_comp);

                kfree_skb(skb);

                return 0;
        }
        /* We receive chip memory dump as an event packet, With a dedicated
         * handler followed by a hardware error event. When this event is
         * received we store dump into a file before closing hci. This
         * dump will help in triaging the issues.
         */
        if ((skb->data[0] == HCI_VENDOR_PKT) &&
            (get_unaligned_be16(skb->data + 2) == QCA_SSR_DUMP_HANDLE))
                return qca_controller_memdump_event(hdev, skb);

        return hci_recv_frame(hdev, skb);
}

#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 = qca_recv_acl_data },
        { H4_RECV_SCO,             .recv = hci_recv_frame    },
        { H4_RECV_EVENT,           .recv = qca_recv_event    },
        { H4_RECV_ISO,             .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, 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_dev_err(hu->hdev, "Frame reassembly failed (%d)", 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 3200000:
                return QCA_BAUDRATE_3200000;
        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_3200000)
                return -EINVAL;

        cmd[4] = baudrate;

        skb = bt_skb_alloc(sizeof(cmd), GFP_KERNEL);
        if (!skb) {
                bt_dev_err(hdev, "Failed to allocate baudrate packet");
                return -ENOMEM;
        }

        /* Assign commands to change baudrate and packet type. */
        skb_put_data(skb, cmd, sizeof(cmd));
        hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;

        skb_queue_tail(&qca->txq, skb);
        hci_uart_tx_wakeup(hu);

        /* Wait for the baudrate change request to be sent */

        while (!skb_queue_empty(&qca->txq))
                usleep_range(100, 200);

        if (hu->serdev)
                serdev_device_wait_until_sent(hu->serdev,
                      msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));

        /* Give the controller time to process the request */
        switch (qca_soc_type(hu)) {
        case QCA_WCN3950:
        case QCA_WCN3988:
        case QCA_WCN3990:
        case QCA_WCN3991:
        case QCA_WCN3998:
        case QCA_WCN6750:
        case QCA_WCN6855:
        case QCA_WCN7850:
                usleep_range(1000, 10000);
                break;

        default:
                msleep(300);
        }

        return 0;
}

static inline void host_set_baudrate(struct hci_uart *hu, unsigned int speed)
{
        if (hu->serdev)
                serdev_device_set_baudrate(hu->serdev, speed);
        else
                hci_uart_set_baudrate(hu, speed);
}

static int qca_send_power_pulse(struct hci_uart *hu, bool on)
{
        int ret;
        int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
        u8 cmd = on ? QCA_WCN3990_POWERON_PULSE : QCA_WCN3990_POWEROFF_PULSE;

        /* These power pulses are single byte command which are sent
         * at required baudrate to wcn3990. On wcn3990, we have an external
         * circuit at Tx pin which decodes the pulse sent at specific baudrate.
         * For example, wcn3990 supports RF COEX antenna for both Wi-Fi/BT
         * and also we use the same power inputs to turn on and off for
         * Wi-Fi/BT. Powering up the power sources will not enable BT, until
         * we send a power on pulse at 115200 bps. This algorithm will help to
         * save power. Disabling hardware flow control is mandatory while
         * sending power pulses to SoC.
         */
        bt_dev_dbg(hu->hdev, "sending power pulse %02x to controller", cmd);

        serdev_device_write_flush(hu->serdev);
        hci_uart_set_flow_control(hu, true);
        ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));
        if (ret < 0) {
                bt_dev_err(hu->hdev, "failed to send power pulse %02x", cmd);
                return ret;
        }

        serdev_device_wait_until_sent(hu->serdev, timeout);
        hci_uart_set_flow_control(hu, false);

        /* Give to controller time to boot/shutdown */
        if (on)
                msleep(100);
        else
                usleep_range(1000, 10000);

        return 0;
}

static unsigned int qca_get_speed(struct hci_uart *hu,
                                  enum qca_speed_type speed_type)
{
        unsigned int speed = 0;

        if (speed_type == QCA_INIT_SPEED) {
                if (hu->init_speed)
                        speed = hu->init_speed;
                else if (hu->proto->init_speed)
                        speed = hu->proto->init_speed;
        } else {
                if (hu->oper_speed)
                        speed = hu->oper_speed;
                else if (hu->proto->oper_speed)
                        speed = hu->proto->oper_speed;
        }

        return speed;
}

static int qca_check_speeds(struct hci_uart *hu)
{
        switch (qca_soc_type(hu)) {
        case QCA_WCN3950:
        case QCA_WCN3988:
        case QCA_WCN3990:
        case QCA_WCN3991:
        case QCA_WCN3998:
        case QCA_WCN6750:
        case QCA_WCN6855:
        case QCA_WCN7850:
                if (!qca_get_speed(hu, QCA_INIT_SPEED) &&
                    !qca_get_speed(hu, QCA_OPER_SPEED))
                        return -EINVAL;
                break;

        default:
                if (!qca_get_speed(hu, QCA_INIT_SPEED) ||
                    !qca_get_speed(hu, QCA_OPER_SPEED))
                        return -EINVAL;
        }

        return 0;
}

static int qca_set_speed(struct hci_uart *hu, enum qca_speed_type speed_type)
{
        unsigned int speed, qca_baudrate;
        struct qca_data *qca = hu->priv;
        int ret = 0;

        if (speed_type == QCA_INIT_SPEED) {
                speed = qca_get_speed(hu, QCA_INIT_SPEED);
                if (speed)
                        host_set_baudrate(hu, speed);
        } else {
                enum qca_btsoc_type soc_type = qca_soc_type(hu);

                speed = qca_get_speed(hu, QCA_OPER_SPEED);
                if (!speed)
                        return 0;

                /* Disable flow control for wcn3990 to deassert RTS while
                 * changing the baudrate of chip and host.
                 */
                switch (soc_type) {
                case QCA_WCN3950:
                case QCA_WCN3988:
                case QCA_WCN3990:
                case QCA_WCN3991:
                case QCA_WCN3998:
                case QCA_WCN6750:
                case QCA_WCN6855:
                case QCA_WCN7850:
                        hci_uart_set_flow_control(hu, true);
                        break;

                default:
                        break;
                }

                switch (soc_type) {
                case QCA_WCN3990:
                        reinit_completion(&qca->drop_ev_comp);
                        set_bit(QCA_DROP_VENDOR_EVENT, &qca->flags);
                        break;

                default:
                        break;
                }

                qca_baudrate = qca_get_baudrate_value(speed);
                bt_dev_dbg(hu->hdev, "Set UART speed to %d", speed);
                ret = qca_set_baudrate(hu->hdev, qca_baudrate);
                if (ret)
                        goto error;

                host_set_baudrate(hu, speed);

error:
                switch (soc_type) {
                case QCA_WCN3950:
                case QCA_WCN3988:
                case QCA_WCN3990:
                case QCA_WCN3991:
                case QCA_WCN3998:
                case QCA_WCN6750:
                case QCA_WCN6855:
                case QCA_WCN7850:
                        hci_uart_set_flow_control(hu, false);
                        break;

                default:
                        break;
                }

                switch (soc_type) {
                case QCA_WCN3990:
                        /* Wait for the controller to send the vendor event
                         * for the baudrate change command.
                         */
                        if (!wait_for_completion_timeout(&qca->drop_ev_comp,
                                                 msecs_to_jiffies(100))) {
                                bt_dev_err(hu->hdev,
                                           "Failed to change controller baudrate\n");
                                ret = -ETIMEDOUT;
                        }

                        clear_bit(QCA_DROP_VENDOR_EVENT, &qca->flags);
                        break;

                default:
                        break;
                }
        }

        return ret;
}

static int qca_send_crashbuffer(struct hci_uart *hu)
{
        struct qca_data *qca = hu->priv;
        struct sk_buff *skb;

        skb = bt_skb_alloc(QCA_CRASHBYTE_PACKET_LEN, GFP_KERNEL);
        if (!skb) {
                bt_dev_err(hu->hdev, "Failed to allocate memory for skb packet");
                return -ENOMEM;
        }

        /* We forcefully crash the controller, by sending 0xfb byte for
         * 1024 times. We also might have chance of losing data, To be
         * on safer side we send 1096 bytes to the SoC.
         */
        memset(skb_put(skb, QCA_CRASHBYTE_PACKET_LEN), QCA_MEMDUMP_BYTE,
               QCA_CRASHBYTE_PACKET_LEN);
        hci_skb_pkt_type(skb) = HCI_COMMAND_PKT;
        bt_dev_info(hu->hdev, "crash the soc to collect controller dump");
        skb_queue_tail(&qca->txq, skb);
        hci_uart_tx_wakeup(hu);

        return 0;
}

static void qca_wait_for_dump_collection(struct hci_dev *hdev)
{
        struct hci_uart *hu = hci_get_drvdata(hdev);
        struct qca_data *qca = hu->priv;

        wait_on_bit_timeout(&qca->flags, QCA_MEMDUMP_COLLECTION,
                            TASK_UNINTERRUPTIBLE, MEMDUMP_TIMEOUT_MS);

        clear_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
}

static void qca_hw_error(struct hci_dev *hdev, u8 code)
{
        struct hci_uart *hu = hci_get_drvdata(hdev);
        struct qca_data *qca = hu->priv;

        set_bit(QCA_SSR_TRIGGERED, &qca->flags);
        set_bit(QCA_HW_ERROR_EVENT, &qca->flags);
        bt_dev_info(hdev, "mem_dump_status: %d", qca->memdump_state);

        if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
                /* If hardware error event received for other than QCA
                 * soc memory dump event, then we need to crash the SOC
                 * and wait here for 8 seconds to get the dump packets.
                 * This will block main thread to be on hold until we
                 * collect dump.
                 */
                set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
                qca_send_crashbuffer(hu);
                qca_wait_for_dump_collection(hdev);
        } else if (qca->memdump_state == QCA_MEMDUMP_COLLECTING) {
                /* Let us wait here until memory dump collected or
                 * memory dump timer expired.
                 */
                bt_dev_info(hdev, "waiting for dump to complete");
                qca_wait_for_dump_collection(hdev);
        }

        mutex_lock(&qca->hci_memdump_lock);
        if (qca->memdump_state != QCA_MEMDUMP_COLLECTED) {
                bt_dev_err(hu->hdev, "clearing allocated memory due to memdump timeout");
                hci_devcd_abort(hu->hdev);
                if (qca->qca_memdump) {
                        kfree(qca->qca_memdump);
                        qca->qca_memdump = NULL;
                }
                qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
                cancel_delayed_work(&qca->ctrl_memdump_timeout);
        }
        mutex_unlock(&qca->hci_memdump_lock);

        if (qca->memdump_state == QCA_MEMDUMP_TIMEOUT ||
            qca->memdump_state == QCA_MEMDUMP_COLLECTED) {
                cancel_work_sync(&qca->ctrl_memdump_evt);
                skb_queue_purge(&qca->rx_memdump_q);
        }

        /*
         * If the BT chip's bt_en pin is connected to a 3.3V power supply via
         * hardware and always stays high, driver cannot control the bt_en pin.
         * As a result, during SSR (SubSystem Restart), QCA_SSR_TRIGGERED and
         * QCA_IBS_DISABLED flags cannot be cleared, which leads to a reset
         * command timeout.
         * Add an msleep delay to ensure controller completes the SSR process.
         *
         * Host will not download the firmware after SSR, controller to remain
         * in the IBS_WAKE state, and the host needs to synchronize with it
         *
         * Since the bluetooth chip has been reset, clear the memdump state.
         */
        if (!hci_test_quirk(hu->hdev, HCI_QUIRK_NON_PERSISTENT_SETUP)) {
                /*
                 * When the SSR (SubSystem Restart) duration exceeds 2 seconds,
                 * it triggers host tx_idle_delay, which sets host TX state
                 * to sleep. Reset tx_idle_timer after SSR to prevent
                 * host enter TX IBS_Sleep mode.
                 */
                mod_timer(&qca->tx_idle_timer, jiffies +
                                  msecs_to_jiffies(qca->tx_idle_delay));

                /* Controller reset completion time is 50ms */
                msleep(50);

                clear_bit(QCA_SSR_TRIGGERED, &qca->flags);
                clear_bit(QCA_IBS_DISABLED, &qca->flags);

                qca->tx_ibs_state = HCI_IBS_TX_AWAKE;
                qca->memdump_state = QCA_MEMDUMP_IDLE;
        }

        clear_bit(QCA_HW_ERROR_EVENT, &qca->flags);
}

static void qca_reset(struct hci_dev *hdev)
{
        struct hci_uart *hu = hci_get_drvdata(hdev);
        struct qca_data *qca = hu->priv;

        set_bit(QCA_SSR_TRIGGERED, &qca->flags);
        if (qca->memdump_state == QCA_MEMDUMP_IDLE) {
                set_bit(QCA_MEMDUMP_COLLECTION, &qca->flags);
                qca_send_crashbuffer(hu);
                qca_wait_for_dump_collection(hdev);
        } else if (qca->memdump_state == QCA_MEMDUMP_COLLECTING) {
                /* Let us wait here until memory dump collected or
                 * memory dump timer expired.
                 */
                bt_dev_info(hdev, "waiting for dump to complete");
                qca_wait_for_dump_collection(hdev);
        }

        mutex_lock(&qca->hci_memdump_lock);
        if (qca->memdump_state != QCA_MEMDUMP_COLLECTED) {
                qca->memdump_state = QCA_MEMDUMP_TIMEOUT;
                if (!test_bit(QCA_HW_ERROR_EVENT, &qca->flags)) {
                        /* Inject hw error event to reset the device
                         * and driver.
                         */
                        hci_reset_dev(hu->hdev);
                }
        }
        mutex_unlock(&qca->hci_memdump_lock);
}

static bool qca_wakeup(struct hci_dev *hdev)
{
        struct hci_uart *hu = hci_get_drvdata(hdev);
        bool wakeup;

        if (!hu->serdev)
                return true;

        /* BT SoC attached through the serial bus is handled by the serdev driver.
         * So we need to use the device handle of the serdev driver to get the
         * status of device may wakeup.
         */
        wakeup = device_may_wakeup(&hu->serdev->ctrl->dev);
        bt_dev_dbg(hu->hdev, "wakeup status : %d", wakeup);

        return wakeup;
}

static int qca_port_reopen(struct hci_uart *hu)
{
        int ret;

        /* Now the device is in ready state to communicate with host.
         * To sync host with device we need to reopen port.
         * Without this, we will have RTS and CTS synchronization
         * issues.
         */
        serdev_device_close(hu->serdev);
        ret = serdev_device_open(hu->serdev);
        if (ret) {
                bt_dev_err(hu->hdev, "failed to open port");
                return ret;
        }

        hci_uart_set_flow_control(hu, false);

        return 0;
}

static int qca_regulator_init(struct hci_uart *hu)
{
        enum qca_btsoc_type soc_type = qca_soc_type(hu);
        struct qca_serdev *qcadev;
        int ret;
        bool sw_ctrl_state;

        /* Check for vregs status, may be hci down has turned
         * off the voltage regulator.
         */
        qcadev = serdev_device_get_drvdata(hu->serdev);

        if (!qcadev->bt_power->vregs_on) {
                serdev_device_close(hu->serdev);
                ret = qca_regulator_enable(qcadev);
                if (ret)
                        return ret;

                ret = serdev_device_open(hu->serdev);
                if (ret) {
                        bt_dev_err(hu->hdev, "failed to open port");
                        return ret;
                }
        }

        switch (soc_type) {
        case QCA_WCN3950:
        case QCA_WCN3988:
        case QCA_WCN3990:
        case QCA_WCN3991:
        case QCA_WCN3998:
                /* Forcefully enable wcn399x to enter in to boot mode. */
                host_set_baudrate(hu, 2400);
                ret = qca_send_power_pulse(hu, false);
                if (ret)
                        return ret;
                break;

        default:
                break;
        }

        /* For wcn6750 need to enable gpio bt_en */
        if (qcadev->bt_en) {
                gpiod_set_value_cansleep(qcadev->bt_en, 0);
                msleep(50);
                gpiod_set_value_cansleep(qcadev->bt_en, 1);
                msleep(50);
                if (qcadev->sw_ctrl) {
                        sw_ctrl_state = gpiod_get_value_cansleep(qcadev->sw_ctrl);
                        bt_dev_dbg(hu->hdev, "SW_CTRL is %d", sw_ctrl_state);
                }
        }

        qca_set_speed(hu, QCA_INIT_SPEED);

        switch (soc_type) {
        case QCA_WCN3950:
        case QCA_WCN3988:
        case QCA_WCN3990:
        case QCA_WCN3991:
        case QCA_WCN3998:
                ret = qca_send_power_pulse(hu, true);
                if (ret)
                        return ret;
                break;

        default:
                break;
        }

        return qca_port_reopen(hu);
}

static int qca_power_on(struct hci_dev *hdev)
{
        struct hci_uart *hu = hci_get_drvdata(hdev);
        enum qca_btsoc_type soc_type = qca_soc_type(hu);
        struct qca_serdev *qcadev;
        struct qca_data *qca = hu->priv;
        int ret = 0;

        /* Non-serdev device usually is powered by external power
         * and don't need additional action in driver for power on
         */
        if (!hu->serdev)
                return 0;

        switch (soc_type) {
        case QCA_WCN3950:
        case QCA_WCN3988:
        case QCA_WCN3990:
        case QCA_WCN3991:
        case QCA_WCN3998:
        case QCA_WCN6750:
        case QCA_WCN6855:
        case QCA_WCN7850:
        case QCA_QCA6390:
                ret = qca_regulator_init(hu);
                break;

        default:
                qcadev = serdev_device_get_drvdata(hu->serdev);
                if (qcadev->bt_en) {
                        gpiod_set_value_cansleep(qcadev->bt_en, 1);
                        /* Controller needs time to bootup. */
                        msleep(150);
                }
        }

        clear_bit(QCA_BT_OFF, &qca->flags);
        return ret;
}

static void hci_coredump_qca(struct hci_dev *hdev)
{
        int err;
        static const u8 param[] = { 0x26 };

        err = __hci_cmd_send(hdev, 0xfc0c, 1, param);
        if (err < 0)
                bt_dev_err(hdev, "%s: trigger crash failed (%d)", __func__, err);
}

static int qca_get_data_path_id(struct hci_dev *hdev, __u8 *data_path_id)
{
        /* QCA uses 1 as non-HCI data path id for HFP */
        *data_path_id = 1;
        return 0;
}

static int qca_configure_hfp_offload(struct hci_dev *hdev)
{
        bt_dev_info(hdev, "HFP non-HCI data transport is supported");
        hdev->get_data_path_id = qca_get_data_path_id;
        /* Do not need to send HCI_Configure_Data_Path to configure non-HCI
         * data transport path for QCA controllers, so set below field as NULL.
         */
        hdev->get_codec_config_data = NULL;
        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;
        unsigned int retries = 0;
        enum qca_btsoc_type soc_type = qca_soc_type(hu);
        const char *firmware_name = qca_get_firmware_name(hu);
        const char *rampatch_name = qca_get_rampatch_name(hu);
        int ret;
        struct qca_btsoc_version ver;
        struct qca_serdev *qcadev = serdev_device_get_drvdata(hu->serdev);
        const char *soc_name;

        ret = qca_check_speeds(hu);
        if (ret)
                return ret;

        clear_bit(QCA_ROM_FW, &qca->flags);
        /* Patch downloading has to be done without IBS mode */
        set_bit(QCA_IBS_DISABLED, &qca->flags);

        /* Enable controller to do both LE scan and BR/EDR inquiry
         * simultaneously.
         */
        hci_set_quirk(hdev, HCI_QUIRK_SIMULTANEOUS_DISCOVERY);

        switch (soc_type) {
        case QCA_QCA2066:
                soc_name = "qca2066";
                break;

        case QCA_WCN3950:
        case QCA_WCN3988:
        case QCA_WCN3990:
        case QCA_WCN3991:
        case QCA_WCN3998:
                soc_name = "wcn399x";
                break;

        case QCA_WCN6750:
                soc_name = "wcn6750";
                break;

        case QCA_WCN6855:
                soc_name = "wcn6855";
                break;

        case QCA_WCN7850:
                soc_name = "wcn7850";
                break;

        default:
                soc_name = "ROME/QCA6390";
        }
        bt_dev_info(hdev, "setting up %s", soc_name);

        qca->memdump_state = QCA_MEMDUMP_IDLE;

retry:
        ret = qca_power_on(hdev);
        if (ret)
                goto out;

        clear_bit(QCA_SSR_TRIGGERED, &qca->flags);

        switch (soc_type) {
        case QCA_WCN3950:
        case QCA_WCN3988:
        case QCA_WCN3990:
        case QCA_WCN3991:
        case QCA_WCN3998:
        case QCA_WCN6750:
        case QCA_WCN6855:
        case QCA_WCN7850:
                if (qcadev->bdaddr_property_broken)
                        hci_set_quirk(hdev, HCI_QUIRK_BDADDR_PROPERTY_BROKEN);

                hci_set_aosp_capable(hdev);

                ret = qca_read_soc_version(hdev, &ver, soc_type);
                if (ret)
                        goto out;
                break;

        default:
                qca_set_speed(hu, QCA_INIT_SPEED);
        }

        /* Setup user speed if needed */
        speed = qca_get_speed(hu, QCA_OPER_SPEED);
        if (speed) {
                ret = qca_set_speed(hu, QCA_OPER_SPEED);
                if (ret)
                        goto out;

                qca_baudrate = qca_get_baudrate_value(speed);
        }

        switch (soc_type) {
        case QCA_WCN3950:
        case QCA_WCN3988:
        case QCA_WCN3990:
        case QCA_WCN3991:
        case QCA_WCN3998:
        case QCA_WCN6750:
        case QCA_WCN6855:
        case QCA_WCN7850:
                break;

        default:
                /* Get QCA version information */
                ret = qca_read_soc_version(hdev, &ver, soc_type);
                if (ret)
                        goto out;
        }

        /* Setup patch / NVM configurations */
        ret = qca_uart_setup(hdev, qca_baudrate, soc_type, ver,
                        firmware_name, rampatch_name);
        if (!ret) {
                clear_bit(QCA_IBS_DISABLED, &qca->flags);
                qca_debugfs_init(hdev);
                hu->hdev->hw_error = qca_hw_error;
                hu->hdev->reset = qca_reset;
                if (hu->serdev) {
                        if (device_can_wakeup(hu->serdev->ctrl->dev.parent))
                                hu->hdev->wakeup = qca_wakeup;
                }
        } else if (ret == -ENOENT) {
                /* No patch/nvm-config found, run with original fw/config */
                set_bit(QCA_ROM_FW, &qca->flags);
                ret = 0;
        } else if (ret == -EAGAIN) {
                /*
                 * Userspace firmware loader will return -EAGAIN in case no
                 * patch/nvm-config is found, so run with original fw/config.
                 */
                set_bit(QCA_ROM_FW, &qca->flags);
                ret = 0;
        }

out:
        if (ret) {
                qca_power_shutdown(hu);

                if (retries < MAX_INIT_RETRIES) {
                        bt_dev_warn(hdev, "Retry BT power ON:%d", retries);
                        if (hu->serdev) {
                                serdev_device_close(hu->serdev);
                                ret = serdev_device_open(hu->serdev);
                                if (ret) {
                                        bt_dev_err(hdev, "failed to open port");
                                        return ret;
                                }
                        }
                        retries++;
                        goto retry;
                }
                return ret;
        }

        /* Setup bdaddr */
        if (soc_type == QCA_ROME)
                hu->hdev->set_bdaddr = qca_set_bdaddr_rome;
        else
                hu->hdev->set_bdaddr = qca_set_bdaddr;

        if (qcadev->support_hfp_hw_offload)
                qca_configure_hfp_offload(hdev);

        qca->fw_version = le16_to_cpu(ver.patch_ver);
        qca->controller_id = le16_to_cpu(ver.rom_ver);
        hci_devcd_register(hdev, hci_coredump_qca, qca_dmp_hdr, NULL);

        return ret;
}

static const struct hci_uart_proto qca_proto = {
        .id             = HCI_UART_QCA,
        .name           = "QCA",
        .manufacturer   = 29,
        .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,
};

static const struct qca_device_data qca_soc_data_wcn3950 __maybe_unused = {
        .soc_type = QCA_WCN3950,
        .vregs = (struct qca_vreg []) {
                { "vddio", 15000  },
                { "vddxo", 60000  },
                { "vddrf", 155000 },
                { "vddch0", 585000 },
        },
        .num_vregs = 4,
};

static const struct qca_device_data qca_soc_data_wcn3988 __maybe_unused = {
        .soc_type = QCA_WCN3988,
        .vregs = (struct qca_vreg []) {
                { "vddio", 15000  },
                { "vddxo", 80000  },
                { "vddrf", 300000 },
                { "vddch0", 450000 },
        },
        .num_vregs = 4,
};

static const struct qca_device_data qca_soc_data_wcn3990 __maybe_unused = {
        .soc_type = QCA_WCN3990,
        .vregs = (struct qca_vreg []) {
                { "vddio", 15000  },
                { "vddxo", 80000  },
                { "vddrf", 300000 },
                { "vddch0", 450000 },
        },
        .num_vregs = 4,
};

static const struct qca_device_data qca_soc_data_wcn3991 __maybe_unused = {
        .soc_type = QCA_WCN3991,
        .vregs = (struct qca_vreg []) {
                { "vddio", 15000  },
                { "vddxo", 80000  },
                { "vddrf", 300000 },
                { "vddch0", 450000 },
        },
        .num_vregs = 4,
        .capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
};

static const struct qca_device_data qca_soc_data_wcn3998 __maybe_unused = {
        .soc_type = QCA_WCN3998,
        .vregs = (struct qca_vreg []) {
                { "vddio", 10000  },
                { "vddxo", 80000  },
                { "vddrf", 300000 },
                { "vddch0", 450000 },
        },
        .num_vregs = 4,
};

static const struct qca_device_data qca_soc_data_qca2066 __maybe_unused = {
        .soc_type = QCA_QCA2066,
        .num_vregs = 0,
        .capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES |
                        QCA_CAP_HFP_HW_OFFLOAD,
};

static const struct qca_device_data qca_soc_data_qca6390 __maybe_unused = {
        .soc_type = QCA_QCA6390,
        .num_vregs = 0,
};

static const struct qca_device_data qca_soc_data_wcn6750 __maybe_unused = {
        .soc_type = QCA_WCN6750,
        .vregs = (struct qca_vreg []) {
                { "vddio", 5000 },
                { "vddaon", 26000 },
                { "vddbtcxmx", 126000 },
                { "vddrfacmn", 12500 },
                { "vddrfa0p8", 102000 },
                { "vddrfa1p7", 302000 },
                { "vddrfa1p2", 257000 },
                { "vddrfa2p2", 1700000 },
                { "vddasd", 200 },
        },
        .num_vregs = 9,
        .capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES,
};

static const struct qca_device_data qca_soc_data_wcn6855 __maybe_unused = {
        .soc_type = QCA_WCN6855,
        .vregs = (struct qca_vreg []) {
                { "vddio", 5000 },
                { "vddbtcxmx", 126000 },
                { "vddrfacmn", 12500 },
                { "vddrfa0p8", 102000 },
                { "vddrfa1p7", 302000 },
                { "vddrfa1p2", 257000 },
        },
        .num_vregs = 6,
        .capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES |
                        QCA_CAP_HFP_HW_OFFLOAD,
};

static const struct qca_device_data qca_soc_data_wcn7850 __maybe_unused = {
        .soc_type = QCA_WCN7850,
        .vregs = (struct qca_vreg []) {
                { "vddio", 5000 },
                { "vddaon", 26000 },
                { "vdddig", 126000 },
                { "vddrfa0p8", 102000 },
                { "vddrfa1p2", 257000 },
                { "vddrfa1p9", 302000 },
        },
        .num_vregs = 6,
        .capabilities = QCA_CAP_WIDEBAND_SPEECH | QCA_CAP_VALID_LE_STATES |
                        QCA_CAP_HFP_HW_OFFLOAD,
};

static void qca_power_shutdown(struct hci_uart *hu)
{
        struct qca_serdev *qcadev;
        struct qca_data *qca = hu->priv;
        unsigned long flags;
        enum qca_btsoc_type soc_type = qca_soc_type(hu);
        bool sw_ctrl_state;
        struct qca_power *power;

        /* From this point we go into power off state. But serial port is
         * still open, stop queueing the IBS data and flush all the buffered
         * data in skb's.
         */
        spin_lock_irqsave(&qca->hci_ibs_lock, flags);
        set_bit(QCA_IBS_DISABLED, &qca->flags);
        qca_flush(hu);
        spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);

        /* Non-serdev device usually is powered by external power
         * and don't need additional action in driver for power down
         */
        if (!hu->serdev)
                return;

        qcadev = serdev_device_get_drvdata(hu->serdev);
        power = qcadev->bt_power;

        if (power && power->pwrseq) {
                pwrseq_power_off(power->pwrseq);
                set_bit(QCA_BT_OFF, &qca->flags);
                return;
        }

        switch (soc_type) {
        case QCA_WCN3988:
        case QCA_WCN3990:
        case QCA_WCN3991:
        case QCA_WCN3998:
                host_set_baudrate(hu, 2400);
                qca_send_power_pulse(hu, false);
                qca_regulator_disable(qcadev);
                break;

        case QCA_WCN6750:
        case QCA_WCN6855:
                gpiod_set_value_cansleep(qcadev->bt_en, 0);
                msleep(100);
                qca_regulator_disable(qcadev);
                if (qcadev->sw_ctrl) {
                        sw_ctrl_state = gpiod_get_value_cansleep(qcadev->sw_ctrl);
                        bt_dev_dbg(hu->hdev, "SW_CTRL is %d", sw_ctrl_state);
                }
                break;

        default:
                gpiod_set_value_cansleep(qcadev->bt_en, 0);
        }

        set_bit(QCA_BT_OFF, &qca->flags);
}

static int qca_power_off(struct hci_dev *hdev)
{
        struct hci_uart *hu = hci_get_drvdata(hdev);
        struct qca_data *qca = hu->priv;
        enum qca_btsoc_type soc_type = qca_soc_type(hu);

        hu->hdev->hw_error = NULL;
        hu->hdev->reset = NULL;

        timer_delete_sync(&qca->wake_retrans_timer);
        timer_delete_sync(&qca->tx_idle_timer);

        /* Stop sending shutdown command if soc crashes. */
        if (soc_type != QCA_ROME
                && qca->memdump_state == QCA_MEMDUMP_IDLE) {
                qca_send_pre_shutdown_cmd(hdev);
                usleep_range(8000, 10000);
        }

        qca_power_shutdown(hu);
        return 0;
}

static int qca_regulator_enable(struct qca_serdev *qcadev)
{
        struct qca_power *power = qcadev->bt_power;
        int ret;

        if (power->pwrseq)
                return pwrseq_power_on(power->pwrseq);

        /* Already enabled */
        if (power->vregs_on)
                return 0;

        BT_DBG("enabling %d regulators)", power->num_vregs);

        ret = regulator_bulk_enable(power->num_vregs, power->vreg_bulk);
        if (ret)
                return ret;

        power->vregs_on = true;

        ret = clk_prepare_enable(qcadev->susclk);
        if (ret)
                qca_regulator_disable(qcadev);

        return ret;
}

static void qca_regulator_disable(struct qca_serdev *qcadev)
{
        struct qca_power *power;

        if (!qcadev)
                return;

        power = qcadev->bt_power;

        /* Already disabled? */
        if (!power->vregs_on)
                return;

        regulator_bulk_disable(power->num_vregs, power->vreg_bulk);
        power->vregs_on = false;

        clk_disable_unprepare(qcadev->susclk);
}

static int qca_init_regulators(struct qca_power *qca,
                                const struct qca_vreg *vregs, size_t num_vregs)
{
        struct regulator_bulk_data *bulk;
        int ret;
        int i;

        bulk = devm_kcalloc(qca->dev, num_vregs, sizeof(*bulk), GFP_KERNEL);
        if (!bulk)
                return -ENOMEM;

        for (i = 0; i < num_vregs; i++)
                bulk[i].supply = vregs[i].name;

        ret = devm_regulator_bulk_get(qca->dev, num_vregs, bulk);
        if (ret < 0)
                return ret;

        for (i = 0; i < num_vregs; i++) {
                ret = regulator_set_load(bulk[i].consumer, vregs[i].load_uA);
                if (ret)
                        return ret;
        }

        qca->vreg_bulk = bulk;
        qca->num_vregs = num_vregs;

        return 0;
}

static int qca_serdev_probe(struct serdev_device *serdev)
{
        struct qca_serdev *qcadev;
        struct hci_dev *hdev;
        const struct qca_device_data *data;
        int err;
        bool power_ctrl_enabled = true;

        qcadev = devm_kzalloc(&serdev->dev, sizeof(*qcadev), GFP_KERNEL);
        if (!qcadev)
                return -ENOMEM;

        qcadev->serdev_hu.serdev = serdev;
        data = device_get_match_data(&serdev->dev);
        serdev_device_set_drvdata(serdev, qcadev);
        device_property_read_string_array(&serdev->dev, "firmware-name",
                                         qcadev->firmware_name, ARRAY_SIZE(qcadev->firmware_name));
        device_property_read_u32(&serdev->dev, "max-speed",
                                 &qcadev->oper_speed);
        if (!qcadev->oper_speed)
                BT_DBG("UART will pick default operating speed");

        qcadev->bdaddr_property_broken = device_property_read_bool(&serdev->dev,
                        "qcom,local-bd-address-broken");

        if (data)
                qcadev->btsoc_type = data->soc_type;
        else
                qcadev->btsoc_type = QCA_ROME;

        switch (qcadev->btsoc_type) {
        case QCA_WCN3950:
        case QCA_WCN3988:
        case QCA_WCN3990:
        case QCA_WCN3991:
        case QCA_WCN3998:
        case QCA_WCN6750:
        case QCA_WCN6855:
        case QCA_WCN7850:
        case QCA_QCA6390:
                qcadev->bt_power = devm_kzalloc(&serdev->dev,
                                                sizeof(struct qca_power),
                                                GFP_KERNEL);
                if (!qcadev->bt_power)
                        return -ENOMEM;
                break;
        default:
                break;
        }

        switch (qcadev->btsoc_type) {
        case QCA_WCN6855:
        case QCA_WCN7850:
        case QCA_WCN6750:
                if (!device_property_present(&serdev->dev, "enable-gpios")) {
                        /*
                         * Backward compatibility with old DT sources. If the
                         * node doesn't have the 'enable-gpios' property then
                         * let's use the power sequencer. Otherwise, let's
                         * drive everything ourselves.
                         */
                        qcadev->bt_power->pwrseq = devm_pwrseq_get(&serdev->dev,
                                                                   "bluetooth");

                        /*
                         * Some modules have BT_EN enabled via a hardware pull-up,
                         * meaning it is not defined in the DTS and is not controlled
                         * through the power sequence. In such cases, fall through
                         * to follow the legacy flow.
                         */
                        if (IS_ERR(qcadev->bt_power->pwrseq))
                                qcadev->bt_power->pwrseq = NULL;
                        else
                                break;
                }
                fallthrough;
        case QCA_WCN3950:
        case QCA_WCN3988:
        case QCA_WCN3990:
        case QCA_WCN3991:
        case QCA_WCN3998:
                qcadev->bt_power->dev = &serdev->dev;
                err = qca_init_regulators(qcadev->bt_power, data->vregs,
                                          data->num_vregs);
                if (err) {
                        BT_ERR("Failed to init regulators:%d", err);
                        return err;
                }

                qcadev->bt_power->vregs_on = false;

                qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
                                               GPIOD_OUT_LOW);
                if (IS_ERR(qcadev->bt_en))
                        return dev_err_probe(&serdev->dev,
                                             PTR_ERR(qcadev->bt_en),
                                             "failed to acquire BT_EN gpio\n");

                if (!qcadev->bt_en &&
                    (data->soc_type == QCA_WCN6750 ||
                     data->soc_type == QCA_WCN6855))
                        power_ctrl_enabled = false;

                qcadev->sw_ctrl = devm_gpiod_get_optional(&serdev->dev, "swctrl",
                                               GPIOD_IN);
                if (IS_ERR(qcadev->sw_ctrl) &&
                    (data->soc_type == QCA_WCN6750 ||
                     data->soc_type == QCA_WCN6855 ||
                     data->soc_type == QCA_WCN7850)) {
                        dev_err(&serdev->dev, "failed to acquire SW_CTRL gpio\n");
                        return PTR_ERR(qcadev->sw_ctrl);
                }

                qcadev->susclk = devm_clk_get_optional(&serdev->dev, NULL);
                if (IS_ERR(qcadev->susclk)) {
                        dev_err(&serdev->dev, "failed to acquire clk\n");
                        return PTR_ERR(qcadev->susclk);
                }
                break;

        case QCA_QCA6390:
                if (dev_of_node(&serdev->dev)) {
                        qcadev->bt_power->pwrseq = devm_pwrseq_get(&serdev->dev,
                                                                   "bluetooth");
                        if (IS_ERR(qcadev->bt_power->pwrseq))
                                return PTR_ERR(qcadev->bt_power->pwrseq);
                        break;
                }
                fallthrough;

        default:
                qcadev->bt_en = devm_gpiod_get_optional(&serdev->dev, "enable",
                                               GPIOD_OUT_LOW);
                if (IS_ERR(qcadev->bt_en)) {
                        dev_err(&serdev->dev, "failed to acquire enable gpio\n");
                        return PTR_ERR(qcadev->bt_en);
                }

                if (!qcadev->bt_en)
                        power_ctrl_enabled = false;

                qcadev->susclk = devm_clk_get_optional_enabled_with_rate(
                                        &serdev->dev, NULL, SUSCLK_RATE_32KHZ);
                if (IS_ERR(qcadev->susclk)) {
                        dev_warn(&serdev->dev, "failed to acquire clk\n");
                        return PTR_ERR(qcadev->susclk);
                }
        }
        
        err = hci_uart_register_device(&qcadev->serdev_hu, &qca_proto);
        if (err) {
                BT_ERR("serdev registration failed");
                return err;
        }

        hdev = qcadev->serdev_hu.hdev;

        if (power_ctrl_enabled) {
                hci_set_quirk(hdev, HCI_QUIRK_NON_PERSISTENT_SETUP);
                hdev->shutdown = qca_power_off;
        }

        if (data) {
                /* Wideband speech support must be set per driver since it can't
                 * be queried via hci. Same with the valid le states quirk.
                 */
                if (data->capabilities & QCA_CAP_WIDEBAND_SPEECH)
                        hci_set_quirk(hdev,
                                      HCI_QUIRK_WIDEBAND_SPEECH_SUPPORTED);

                if (!(data->capabilities & QCA_CAP_VALID_LE_STATES))
                        hci_set_quirk(hdev, HCI_QUIRK_BROKEN_LE_STATES);

                if (data->capabilities & QCA_CAP_HFP_HW_OFFLOAD)
                        qcadev->support_hfp_hw_offload = true;
        }

        return 0;
}

static void qca_serdev_remove(struct serdev_device *serdev)
{
        struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
        struct qca_power *power = qcadev->bt_power;

        switch (qcadev->btsoc_type) {
        case QCA_WCN3988:
        case QCA_WCN3990:
        case QCA_WCN3991:
        case QCA_WCN3998:
        case QCA_WCN6750:
        case QCA_WCN6855:
        case QCA_WCN7850:
                if (power->vregs_on)
                        qca_power_shutdown(&qcadev->serdev_hu);
                break;
        default:
                break;
        }

        hci_uart_unregister_device(&qcadev->serdev_hu);
}

static void qca_serdev_shutdown(struct serdev_device *serdev)
{
        int ret;
        int timeout = msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS);
        struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
        struct hci_uart *hu = &qcadev->serdev_hu;
        struct hci_dev *hdev = hu->hdev;
        const u8 ibs_wake_cmd[] = { 0xFD };
        const u8 edl_reset_soc_cmd[] = { 0x01, 0x00, 0xFC, 0x01, 0x05 };

        if (qcadev->btsoc_type == QCA_QCA6390) {
                /* The purpose of sending the VSC is to reset SOC into a initial
                 * state and the state will ensure next hdev->setup() success.
                 * if HCI_QUIRK_NON_PERSISTENT_SETUP is set, it means that
                 * hdev->setup() can do its job regardless of SoC state, so
                 * don't need to send the VSC.
                 * if HCI_SETUP is set, it means that hdev->setup() was never
                 * invoked and the SOC is already in the initial state, so
                 * don't also need to send the VSC.
                 */
                if (hci_test_quirk(hdev, HCI_QUIRK_NON_PERSISTENT_SETUP) ||
                    hci_dev_test_flag(hdev, HCI_SETUP))
                        return;

                /* The serdev must be in open state when control logic arrives
                 * here, so also fix the use-after-free issue caused by that
                 * the serdev is flushed or wrote after it is closed.
                 */
                serdev_device_write_flush(serdev);
                ret = serdev_device_write_buf(serdev, ibs_wake_cmd,
                                              sizeof(ibs_wake_cmd));
                if (ret < 0) {
                        BT_ERR("QCA send IBS_WAKE_IND error: %d", ret);
                        return;
                }
                serdev_device_wait_until_sent(serdev, timeout);
                usleep_range(8000, 10000);

                serdev_device_write_flush(serdev);
                ret = serdev_device_write_buf(serdev, edl_reset_soc_cmd,
                                              sizeof(edl_reset_soc_cmd));
                if (ret < 0) {
                        BT_ERR("QCA send EDL_RESET_REQ error: %d", ret);
                        return;
                }
                serdev_device_wait_until_sent(serdev, timeout);
                usleep_range(8000, 10000);
        }
}

static int __maybe_unused qca_suspend(struct device *dev)
{
        struct serdev_device *serdev = to_serdev_device(dev);
        struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
        struct hci_uart *hu = &qcadev->serdev_hu;
        struct qca_data *qca = hu->priv;
        unsigned long flags;
        bool tx_pending = false;
        int ret = 0;
        u8 cmd;
        u32 wait_timeout = 0;

        set_bit(QCA_SUSPENDING, &qca->flags);

        /* if BT SoC is running with default firmware then it does not
         * support in-band sleep
         */
        if (test_bit(QCA_ROM_FW, &qca->flags))
                return 0;

        /* During SSR after memory dump collection, controller will be
         * powered off and then powered on.If controller is powered off
         * during SSR then we should wait until SSR is completed.
         */
        if (test_bit(QCA_BT_OFF, &qca->flags) &&
            !test_bit(QCA_SSR_TRIGGERED, &qca->flags))
                return 0;

        if (test_bit(QCA_IBS_DISABLED, &qca->flags) ||
            test_bit(QCA_SSR_TRIGGERED, &qca->flags)) {
                wait_timeout = test_bit(QCA_SSR_TRIGGERED, &qca->flags) ?
                                        IBS_DISABLE_SSR_TIMEOUT_MS :
                                        FW_DOWNLOAD_TIMEOUT_MS;

                /* QCA_IBS_DISABLED flag is set to true, During FW download
                 * and during memory dump collection. It is reset to false,
                 * After FW download complete.
                 */
                wait_on_bit_timeout(&qca->flags, QCA_IBS_DISABLED,
                            TASK_UNINTERRUPTIBLE, msecs_to_jiffies(wait_timeout));

                if (test_bit(QCA_IBS_DISABLED, &qca->flags)) {
                        bt_dev_err(hu->hdev, "SSR or FW download time out");
                        ret = -ETIMEDOUT;
                        goto error;
                }
        }

        cancel_work_sync(&qca->ws_awake_device);
        cancel_work_sync(&qca->ws_awake_rx);

        spin_lock_irqsave_nested(&qca->hci_ibs_lock,
                                 flags, SINGLE_DEPTH_NESTING);

        switch (qca->tx_ibs_state) {
        case HCI_IBS_TX_WAKING:
                timer_delete(&qca->wake_retrans_timer);
                fallthrough;
        case HCI_IBS_TX_AWAKE:
                timer_delete(&qca->tx_idle_timer);

                serdev_device_write_flush(hu->serdev);
                cmd = HCI_IBS_SLEEP_IND;
                ret = serdev_device_write_buf(hu->serdev, &cmd, sizeof(cmd));

                if (ret < 0) {
                        BT_ERR("Failed to send SLEEP to device");
                        break;
                }

                qca->tx_ibs_state = HCI_IBS_TX_ASLEEP;
                qca->ibs_sent_slps++;
                tx_pending = true;
                break;

        case HCI_IBS_TX_ASLEEP:
                break;

        default:
                BT_ERR("Spurious tx state %d", qca->tx_ibs_state);
                ret = -EINVAL;
                break;
        }

        spin_unlock_irqrestore(&qca->hci_ibs_lock, flags);

        if (ret < 0)
                goto error;

        if (tx_pending) {
                serdev_device_wait_until_sent(hu->serdev,
                                              msecs_to_jiffies(CMD_TRANS_TIMEOUT_MS));
                serial_clock_vote(HCI_IBS_TX_VOTE_CLOCK_OFF, hu);
        }

        /* Wait for HCI_IBS_SLEEP_IND sent by device to indicate its Tx is going
         * to sleep, so that the packet does not wake the system later.
         */
        ret = wait_event_interruptible_timeout(qca->suspend_wait_q,
                        qca->rx_ibs_state == HCI_IBS_RX_ASLEEP,
                        msecs_to_jiffies(IBS_BTSOC_TX_IDLE_TIMEOUT_MS));
        if (ret == 0) {
                ret = -ETIMEDOUT;
                goto error;
        }

        return 0;

error:
        clear_bit(QCA_SUSPENDING, &qca->flags);

        return ret;
}

static int __maybe_unused qca_resume(struct device *dev)
{
        struct serdev_device *serdev = to_serdev_device(dev);
        struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
        struct hci_uart *hu = &qcadev->serdev_hu;
        struct qca_data *qca = hu->priv;

        clear_bit(QCA_SUSPENDING, &qca->flags);

        return 0;
}

static SIMPLE_DEV_PM_OPS(qca_pm_ops, qca_suspend, qca_resume);

#ifdef CONFIG_OF
static const struct of_device_id qca_bluetooth_of_match[] = {
        { .compatible = "qcom,qca2066-bt", .data = &qca_soc_data_qca2066},
        { .compatible = "qcom,qca6174-bt" },
        { .compatible = "qcom,qca6390-bt", .data = &qca_soc_data_qca6390},
        { .compatible = "qcom,qca9377-bt" },
        { .compatible = "qcom,wcn3950-bt", .data = &qca_soc_data_wcn3950},
        { .compatible = "qcom,wcn3988-bt", .data = &qca_soc_data_wcn3988},
        { .compatible = "qcom,wcn3990-bt", .data = &qca_soc_data_wcn3990},
        { .compatible = "qcom,wcn3991-bt", .data = &qca_soc_data_wcn3991},
        { .compatible = "qcom,wcn3998-bt", .data = &qca_soc_data_wcn3998},
        { .compatible = "qcom,wcn6750-bt", .data = &qca_soc_data_wcn6750},
        { .compatible = "qcom,wcn6855-bt", .data = &qca_soc_data_wcn6855},
        { .compatible = "qcom,wcn7850-bt", .data = &qca_soc_data_wcn7850},
        { /* sentinel */ }
};
MODULE_DEVICE_TABLE(of, qca_bluetooth_of_match);
#endif

#ifdef CONFIG_ACPI
static const struct acpi_device_id qca_bluetooth_acpi_match[] = {
        { "QCOM2066", (kernel_ulong_t)&qca_soc_data_qca2066 },
        { "QCOM6390", (kernel_ulong_t)&qca_soc_data_qca6390 },
        { "DLA16390", (kernel_ulong_t)&qca_soc_data_qca6390 },
        { "DLB16390", (kernel_ulong_t)&qca_soc_data_qca6390 },
        { "DLB26390", (kernel_ulong_t)&qca_soc_data_qca6390 },
        { },
};
MODULE_DEVICE_TABLE(acpi, qca_bluetooth_acpi_match);
#endif

#ifdef CONFIG_DEV_COREDUMP
static void hciqca_coredump(struct device *dev)
{
        struct serdev_device *serdev = to_serdev_device(dev);
        struct qca_serdev *qcadev = serdev_device_get_drvdata(serdev);
        struct hci_uart *hu = &qcadev->serdev_hu;
        struct hci_dev  *hdev = hu->hdev;

        if (hdev->dump.coredump)
                hdev->dump.coredump(hdev);
}
#endif

static struct serdev_device_driver qca_serdev_driver = {
        .probe = qca_serdev_probe,
        .remove = qca_serdev_remove,
        .shutdown = qca_serdev_shutdown,
        .driver = {
                .name = "hci_uart_qca",
                .of_match_table = of_match_ptr(qca_bluetooth_of_match),
                .acpi_match_table = ACPI_PTR(qca_bluetooth_acpi_match),
                .pm = &qca_pm_ops,
#ifdef CONFIG_DEV_COREDUMP
                .coredump = hciqca_coredump,
#endif
        },
};

int __init qca_init(void)
{
        serdev_device_driver_register(&qca_serdev_driver);

        return hci_uart_register_proto(&qca_proto);
}

int __exit qca_deinit(void)
{
        serdev_device_driver_unregister(&qca_serdev_driver);

        return hci_uart_unregister_proto(&qca_proto);
}