// SPDX-License-Identifier: GPL-2.0-only
/*
 * This file contains functions used in USB interface module.
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/delay.h>
#include <linux/module.h>
#include <linux/firmware.h>
#include <linux/netdevice.h>
#include <linux/slab.h>
#include <linux/usb.h>
#include <linux/olpc-ec.h>

#ifdef CONFIG_OLPC
#include <asm/olpc.h>
#endif

#define DRV_NAME "usb8xxx"

#include "host.h"
#include "decl.h"
#include "defs.h"
#include "dev.h"
#include "cmd.h"
#include "if_usb.h"

#define INSANEDEBUG     0
#define lbs_deb_usb2(...) do { if (INSANEDEBUG) lbs_deb_usbd(__VA_ARGS__); } while (0)

#define MESSAGE_HEADER_LEN      4

MODULE_FIRMWARE("libertas/usb8388_v9.bin");
MODULE_FIRMWARE("libertas/usb8388_v5.bin");
MODULE_FIRMWARE("libertas/usb8388.bin");
MODULE_FIRMWARE("libertas/usb8682.bin");
MODULE_FIRMWARE("usb8388.bin");

enum {
        MODEL_UNKNOWN = 0x0,
        MODEL_8388 = 0x1,
        MODEL_8682 = 0x2
};

/* table of firmware file names */
static const struct lbs_fw_table fw_table[] = {
        { MODEL_8388, "libertas/usb8388_olpc.bin", NULL },
        { MODEL_8388, "libertas/usb8388_v9.bin", NULL },
        { MODEL_8388, "libertas/usb8388_v5.bin", NULL },
        { MODEL_8388, "libertas/usb8388.bin", NULL },
        { MODEL_8388, "usb8388.bin", NULL },
        { MODEL_8682, "libertas/usb8682.bin", NULL },
        { 0, NULL, NULL }
};

static const struct usb_device_id if_usb_table[] = {
        /* Enter the device signature inside */
        { USB_DEVICE(0x1286, 0x2001), .driver_info = MODEL_8388 },
        { USB_DEVICE(0x05a3, 0x8388), .driver_info = MODEL_8388 },
        {}      /* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, if_usb_table);

static void if_usb_receive(struct urb *urb);
static void if_usb_receive_fwload(struct urb *urb);
static void if_usb_prog_firmware(struct lbs_private *priv, int ret,
                                 const struct firmware *fw,
                                 const struct firmware *unused);
static int if_usb_host_to_card(struct lbs_private *priv, uint8_t type,
                               uint8_t *payload, uint16_t nb);
static int usb_tx_block(struct if_usb_card *cardp, uint8_t *payload,
                        uint16_t nb);
static void if_usb_free(struct if_usb_card *cardp);
static int if_usb_submit_rx_urb(struct if_usb_card *cardp);
static int if_usb_reset_device(struct if_usb_card *cardp);

/**
 * if_usb_write_bulk_callback - callback function to handle the status
 * of the URB
 * @urb:        pointer to &urb structure
 * returns:     N/A
 */
static void if_usb_write_bulk_callback(struct urb *urb)
{
        struct if_usb_card *cardp = (struct if_usb_card *) urb->context;

        /* handle the transmission complete validations */

        if (urb->status == 0) {
                struct lbs_private *priv = cardp->priv;

                lbs_deb_usb2(&urb->dev->dev, "URB status is successful\n");
                lbs_deb_usb2(&urb->dev->dev, "Actual length transmitted %d\n",
                             urb->actual_length);

                /* Boot commands such as UPDATE_FW and UPDATE_BOOT2 are not
                 * passed up to the lbs level.
                 */
                if (priv && priv->dnld_sent != DNLD_BOOTCMD_SENT)
                        lbs_host_to_card_done(priv);
        } else {
                /* print the failure status number for debug */
                pr_info("URB in failure status: %d\n", urb->status);
        }
}

/**
 * if_usb_free - free tx/rx urb, skb and rx buffer
 * @cardp:      pointer to &if_usb_card
 * returns:     N/A
 */
static void if_usb_free(struct if_usb_card *cardp)
{
        /* Unlink tx & rx urb */
        usb_kill_urb(cardp->tx_urb);
        usb_kill_urb(cardp->rx_urb);

        usb_free_urb(cardp->tx_urb);
        cardp->tx_urb = NULL;

        usb_free_urb(cardp->rx_urb);
        cardp->rx_urb = NULL;

        kfree(cardp->ep_out_buf);
        cardp->ep_out_buf = NULL;
}

static void if_usb_setup_firmware(struct lbs_private *priv)
{
        struct if_usb_card *cardp = priv->card;
        struct cmd_ds_set_boot2_ver b2_cmd;
        struct cmd_ds_802_11_fw_wake_method wake_method;

        b2_cmd.hdr.size = cpu_to_le16(sizeof(b2_cmd));
        b2_cmd.action = 0;
        b2_cmd.version = cardp->boot2_version;

        if (lbs_cmd_with_response(priv, CMD_SET_BOOT2_VER, &b2_cmd))
                lbs_deb_usb("Setting boot2 version failed\n");

        priv->wol_gpio = 2; /* Wake via GPIO2... */
        priv->wol_gap = 20; /* ... after 20ms    */
        lbs_host_sleep_cfg(priv, EHS_WAKE_ON_UNICAST_DATA,
                        (struct wol_config *) NULL);

        wake_method.hdr.size = cpu_to_le16(sizeof(wake_method));
        wake_method.action = cpu_to_le16(CMD_ACT_GET);
        if (lbs_cmd_with_response(priv, CMD_802_11_FW_WAKE_METHOD, &wake_method)) {
                netdev_info(priv->dev, "Firmware does not seem to support PS mode\n");
                priv->fwcapinfo &= ~FW_CAPINFO_PS;
        } else {
                if (le16_to_cpu(wake_method.method) == CMD_WAKE_METHOD_COMMAND_INT) {
                        lbs_deb_usb("Firmware seems to support PS with wake-via-command\n");
                } else {
                        /* The versions which boot up this way don't seem to
                           work even if we set it to the command interrupt */
                        priv->fwcapinfo &= ~FW_CAPINFO_PS;
                        netdev_info(priv->dev,
                                    "Firmware doesn't wake via command interrupt; disabling PS mode\n");
                }
        }
}

static void if_usb_fw_timeo(struct timer_list *t)
{
        struct if_usb_card *cardp = timer_container_of(cardp, t, fw_timeout);

        if (cardp->fwdnldover) {
                lbs_deb_usb("Download complete, no event. Assuming success\n");
        } else {
                pr_err("Download timed out\n");
                cardp->surprise_removed = 1;
        }
        wake_up(&cardp->fw_wq);
}

#ifdef CONFIG_OLPC
static void if_usb_reset_olpc_card(struct lbs_private *priv)
{
        printk(KERN_CRIT "Resetting OLPC wireless via EC...\n");
        olpc_ec_cmd(0x25, NULL, 0, NULL, 0);
}
#endif

/**
 * if_usb_probe - sets the configuration values
 * @intf:       &usb_interface pointer
 * @id: pointer to usb_device_id
 * returns:     0 on success, error code on failure
 */
static int if_usb_probe(struct usb_interface *intf,
                        const struct usb_device_id *id)
{
        struct usb_device *udev;
        struct usb_host_interface *iface_desc;
        struct usb_endpoint_descriptor *endpoint;
        struct lbs_private *priv;
        struct if_usb_card *cardp;
        int r = -ENOMEM;
        int i;

        udev = interface_to_usbdev(intf);

        cardp = kzalloc_obj(struct if_usb_card);
        if (!cardp)
                goto error;

        timer_setup(&cardp->fw_timeout, if_usb_fw_timeo, 0);
        init_waitqueue_head(&cardp->fw_wq);

        cardp->udev = udev;
        cardp->model = (uint32_t) id->driver_info;
        iface_desc = intf->cur_altsetting;

        lbs_deb_usbd(&udev->dev, "bcdUSB = 0x%X bDeviceClass = 0x%X"
                     " bDeviceSubClass = 0x%X, bDeviceProtocol = 0x%X\n",
                     le16_to_cpu(udev->descriptor.bcdUSB),
                     udev->descriptor.bDeviceClass,
                     udev->descriptor.bDeviceSubClass,
                     udev->descriptor.bDeviceProtocol);

        for (i = 0; i < iface_desc->desc.bNumEndpoints; ++i) {
                endpoint = &iface_desc->endpoint[i].desc;
                if (usb_endpoint_is_bulk_in(endpoint)) {
                        cardp->ep_in_size = le16_to_cpu(endpoint->wMaxPacketSize);
                        cardp->ep_in = usb_endpoint_num(endpoint);

                        lbs_deb_usbd(&udev->dev, "in_endpoint = %d\n", cardp->ep_in);
                        lbs_deb_usbd(&udev->dev, "Bulk in size is %d\n", cardp->ep_in_size);

                } else if (usb_endpoint_is_bulk_out(endpoint)) {
                        cardp->ep_out_size = le16_to_cpu(endpoint->wMaxPacketSize);
                        cardp->ep_out = usb_endpoint_num(endpoint);

                        lbs_deb_usbd(&udev->dev, "out_endpoint = %d\n", cardp->ep_out);
                        lbs_deb_usbd(&udev->dev, "Bulk out size is %d\n", cardp->ep_out_size);
                }
        }
        if (!cardp->ep_out_size || !cardp->ep_in_size) {
                lbs_deb_usbd(&udev->dev, "Endpoints not found\n");
                goto dealloc;
        }
        if (!(cardp->rx_urb = usb_alloc_urb(0, GFP_KERNEL))) {
                lbs_deb_usbd(&udev->dev, "Rx URB allocation failed\n");
                goto dealloc;
        }
        if (!(cardp->tx_urb = usb_alloc_urb(0, GFP_KERNEL))) {
                lbs_deb_usbd(&udev->dev, "Tx URB allocation failed\n");
                goto dealloc;
        }
        cardp->ep_out_buf = kmalloc(MRVDRV_ETH_TX_PACKET_BUFFER_SIZE, GFP_KERNEL);
        if (!cardp->ep_out_buf) {
                lbs_deb_usbd(&udev->dev, "Could not allocate buffer\n");
                goto dealloc;
        }

        priv = lbs_add_card(cardp, &intf->dev);
        if (IS_ERR(priv)) {
                r = PTR_ERR(priv);
                goto err_add_card;
        }

        cardp->priv = priv;

        priv->hw_host_to_card = if_usb_host_to_card;
        priv->enter_deep_sleep = NULL;
        priv->exit_deep_sleep = NULL;
        priv->reset_deep_sleep_wakeup = NULL;
        priv->is_polling = false;
#ifdef CONFIG_OLPC
        if (machine_is_olpc())
                priv->reset_card = if_usb_reset_olpc_card;
#endif

        cardp->boot2_version = udev->descriptor.bcdDevice;

        usb_get_dev(udev);
        usb_set_intfdata(intf, cardp);

        r = lbs_get_firmware_async(priv, &udev->dev, cardp->model,
                                   fw_table, if_usb_prog_firmware);
        if (r)
                goto err_get_fw;

        return 0;

err_get_fw:
        usb_put_dev(udev);
        lbs_remove_card(priv);
err_add_card:
        if_usb_reset_device(cardp);
dealloc:
        if_usb_free(cardp);
        kfree(cardp);

error:
        return r;
}

/**
 * if_usb_disconnect - free resource and cleanup
 * @intf:       USB interface structure
 * returns:     N/A
 */
static void if_usb_disconnect(struct usb_interface *intf)
{
        struct if_usb_card *cardp = usb_get_intfdata(intf);
        struct lbs_private *priv = cardp->priv;

        cardp->surprise_removed = 1;

        if (priv) {
                lbs_stop_card(priv);
                lbs_remove_card(priv);
        }

        /* Unlink and free urb */
        if_usb_free(cardp);
        kfree(cardp);

        usb_set_intfdata(intf, NULL);
        usb_put_dev(interface_to_usbdev(intf));
}

/**
 * if_usb_send_fw_pkt - download FW
 * @cardp:      pointer to &struct if_usb_card
 * returns:     0
 */
static int if_usb_send_fw_pkt(struct if_usb_card *cardp)
{
        struct fwdata *fwdata = cardp->ep_out_buf;
        const uint8_t *firmware = cardp->fw->data;

        /* If we got a CRC failure on the last block, back
           up and retry it */
        if (!cardp->CRC_OK) {
                cardp->totalbytes = cardp->fwlastblksent;
                cardp->fwseqnum--;
        }

        lbs_deb_usb2(&cardp->udev->dev, "totalbytes = %d\n",
                     cardp->totalbytes);

        /* struct fwdata (which we sent to the card) has an
           extra __le32 field in between the header and the data,
           which is not in the struct fwheader in the actual
           firmware binary. Insert the seqnum in the middle... */
        memcpy(&fwdata->hdr, &firmware[cardp->totalbytes],
               sizeof(struct fwheader));

        cardp->fwlastblksent = cardp->totalbytes;
        cardp->totalbytes += sizeof(struct fwheader);

        memcpy(fwdata->data, &firmware[cardp->totalbytes],
               le32_to_cpu(fwdata->hdr.datalength));

        lbs_deb_usb2(&cardp->udev->dev, "Data length = %d\n",
                     le32_to_cpu(fwdata->hdr.datalength));

        fwdata->seqnum = cpu_to_le32(++cardp->fwseqnum);
        cardp->totalbytes += le32_to_cpu(fwdata->hdr.datalength);

        usb_tx_block(cardp, cardp->ep_out_buf, sizeof(struct fwdata) +
                     le32_to_cpu(fwdata->hdr.datalength));

        if (fwdata->hdr.dnldcmd == cpu_to_le32(FW_HAS_DATA_TO_RECV)) {
                lbs_deb_usb2(&cardp->udev->dev, "There are data to follow\n");
                lbs_deb_usb2(&cardp->udev->dev, "seqnum = %d totalbytes = %d\n",
                             cardp->fwseqnum, cardp->totalbytes);
        } else if (fwdata->hdr.dnldcmd == cpu_to_le32(FW_HAS_LAST_BLOCK)) {
                lbs_deb_usb2(&cardp->udev->dev, "Host has finished FW downloading\n");
                lbs_deb_usb2(&cardp->udev->dev, "Downloading FW JUMP BLOCK\n");

                cardp->fwfinalblk = 1;
        }

        lbs_deb_usb2(&cardp->udev->dev, "Firmware download done; size %d\n",
                     cardp->totalbytes);

        return 0;
}

static int if_usb_reset_device(struct if_usb_card *cardp)
{
        struct cmd_header *cmd = cardp->ep_out_buf + 4;
        int ret;

        *(__le32 *)cardp->ep_out_buf = cpu_to_le32(CMD_TYPE_REQUEST);

        cmd->command = cpu_to_le16(CMD_802_11_RESET);
        cmd->size = cpu_to_le16(sizeof(cmd));
        cmd->result = cpu_to_le16(0);
        cmd->seqnum = cpu_to_le16(0x5a5a);
        usb_tx_block(cardp, cardp->ep_out_buf, 4 + sizeof(struct cmd_header));

        msleep(100);
        ret = usb_reset_device(cardp->udev);
        msleep(100);

#ifdef CONFIG_OLPC
        if (ret && machine_is_olpc())
                if_usb_reset_olpc_card(NULL);
#endif

        return ret;
}

/**
 *  usb_tx_block - transfer the data to the device
 *  @cardp:     pointer to &struct if_usb_card
 *  @payload:   pointer to payload data
 *  @nb:        data length
 *  returns:    0 for success or negative error code
 */
static int usb_tx_block(struct if_usb_card *cardp, uint8_t *payload, uint16_t nb)
{
        int ret;

        /* check if device is removed */
        if (cardp->surprise_removed) {
                lbs_deb_usbd(&cardp->udev->dev, "Device removed\n");
                ret = -ENODEV;
                goto tx_ret;
        }

        usb_kill_urb(cardp->tx_urb);

        usb_fill_bulk_urb(cardp->tx_urb, cardp->udev,
                          usb_sndbulkpipe(cardp->udev,
                                          cardp->ep_out),
                          payload, nb, if_usb_write_bulk_callback, cardp);

        cardp->tx_urb->transfer_flags |= URB_ZERO_PACKET;

        if ((ret = usb_submit_urb(cardp->tx_urb, GFP_ATOMIC))) {
                lbs_deb_usbd(&cardp->udev->dev, "usb_submit_urb failed: %d\n", ret);
        } else {
                lbs_deb_usb2(&cardp->udev->dev, "usb_submit_urb success\n");
                ret = 0;
        }

tx_ret:
        return ret;
}

static int __if_usb_submit_rx_urb(struct if_usb_card *cardp,
                                  void (*callbackfn)(struct urb *urb))
{
        struct sk_buff *skb;
        int ret = -1;

        if (!(skb = dev_alloc_skb(MRVDRV_ETH_RX_PACKET_BUFFER_SIZE))) {
                pr_err("No free skb\n");
                goto rx_ret;
        }

        cardp->rx_skb = skb;

        /* Fill the receive configuration URB and initialise the Rx call back */
        usb_fill_bulk_urb(cardp->rx_urb, cardp->udev,
                          usb_rcvbulkpipe(cardp->udev, cardp->ep_in),
                          skb->data + IPFIELD_ALIGN_OFFSET,
                          MRVDRV_ETH_RX_PACKET_BUFFER_SIZE, callbackfn,
                          cardp);

        lbs_deb_usb2(&cardp->udev->dev, "Pointer for rx_urb %p\n", cardp->rx_urb);
        if ((ret = usb_submit_urb(cardp->rx_urb, GFP_ATOMIC))) {
                lbs_deb_usbd(&cardp->udev->dev, "Submit Rx URB failed: %d\n", ret);
                kfree_skb(skb);
                cardp->rx_skb = NULL;
                ret = -1;
        } else {
                lbs_deb_usb2(&cardp->udev->dev, "Submit Rx URB success\n");
                ret = 0;
        }

rx_ret:
        return ret;
}

static int if_usb_submit_rx_urb_fwload(struct if_usb_card *cardp)
{
        return __if_usb_submit_rx_urb(cardp, &if_usb_receive_fwload);
}

static int if_usb_submit_rx_urb(struct if_usb_card *cardp)
{
        return __if_usb_submit_rx_urb(cardp, &if_usb_receive);
}

static void if_usb_receive_fwload(struct urb *urb)
{
        struct if_usb_card *cardp = urb->context;
        struct sk_buff *skb = cardp->rx_skb;
        struct fwsyncheader *syncfwheader;
        struct bootcmdresp bootcmdresp;

        if (urb->status) {
                lbs_deb_usbd(&cardp->udev->dev,
                             "URB status is failed during fw load\n");
                kfree_skb(skb);
                return;
        }

        if (cardp->fwdnldover) {
                __le32 *tmp = (__le32 *)(skb->data + IPFIELD_ALIGN_OFFSET);

                if (tmp[0] == cpu_to_le32(CMD_TYPE_INDICATION) &&
                    tmp[1] == cpu_to_le32(MACREG_INT_CODE_FIRMWARE_READY)) {
                        pr_info("Firmware ready event received\n");
                        wake_up(&cardp->fw_wq);
                } else {
                        lbs_deb_usb("Waiting for confirmation; got %x %x\n",
                                    le32_to_cpu(tmp[0]), le32_to_cpu(tmp[1]));
                        if_usb_submit_rx_urb_fwload(cardp);
                }
                kfree_skb(skb);
                return;
        }
        if (cardp->bootcmdresp <= 0) {
                memcpy (&bootcmdresp, skb->data + IPFIELD_ALIGN_OFFSET,
                        sizeof(bootcmdresp));

                if (le16_to_cpu(cardp->udev->descriptor.bcdDevice) < 0x3106) {
                        kfree_skb(skb);
                        if_usb_submit_rx_urb_fwload(cardp);
                        cardp->bootcmdresp = BOOT_CMD_RESP_OK;
                        lbs_deb_usbd(&cardp->udev->dev,
                                     "Received valid boot command response\n");
                        return;
                }
                if (bootcmdresp.magic != cpu_to_le32(BOOT_CMD_MAGIC_NUMBER)) {
                        if (bootcmdresp.magic == cpu_to_le32(CMD_TYPE_REQUEST) ||
                            bootcmdresp.magic == cpu_to_le32(CMD_TYPE_DATA) ||
                            bootcmdresp.magic == cpu_to_le32(CMD_TYPE_INDICATION)) {
                                if (!cardp->bootcmdresp)
                                        pr_info("Firmware already seems alive; resetting\n");
                                cardp->bootcmdresp = -1;
                        } else {
                                pr_info("boot cmd response wrong magic number (0x%x)\n",
                                            le32_to_cpu(bootcmdresp.magic));
                        }
                } else if ((bootcmdresp.cmd != BOOT_CMD_FW_BY_USB) &&
                           (bootcmdresp.cmd != BOOT_CMD_UPDATE_FW) &&
                           (bootcmdresp.cmd != BOOT_CMD_UPDATE_BOOT2)) {
                        pr_info("boot cmd response cmd_tag error (%d)\n",
                                bootcmdresp.cmd);
                } else if (bootcmdresp.result != BOOT_CMD_RESP_OK) {
                        pr_info("boot cmd response result error (%d)\n",
                                bootcmdresp.result);
                } else {
                        cardp->bootcmdresp = 1;
                        lbs_deb_usbd(&cardp->udev->dev,
                                     "Received valid boot command response\n");
                }
                kfree_skb(skb);
                if_usb_submit_rx_urb_fwload(cardp);
                return;
        }

        syncfwheader = kmemdup(skb->data + IPFIELD_ALIGN_OFFSET,
                               sizeof(struct fwsyncheader), GFP_ATOMIC);
        if (!syncfwheader) {
                lbs_deb_usbd(&cardp->udev->dev, "Failure to allocate syncfwheader\n");
                kfree_skb(skb);
                return;
        }

        if (!syncfwheader->cmd) {
                lbs_deb_usb2(&cardp->udev->dev, "FW received Blk with correct CRC\n");
                lbs_deb_usb2(&cardp->udev->dev, "FW received Blk seqnum = %d\n",
                             le32_to_cpu(syncfwheader->seqnum));
                cardp->CRC_OK = 1;
        } else {
                lbs_deb_usbd(&cardp->udev->dev, "FW received Blk with CRC error\n");
                cardp->CRC_OK = 0;
        }

        kfree_skb(skb);

        /* Give device 5s to either write firmware to its RAM or eeprom */
        mod_timer(&cardp->fw_timeout, jiffies + (HZ*5));

        if (cardp->fwfinalblk) {
                cardp->fwdnldover = 1;
                goto exit;
        }

        if_usb_send_fw_pkt(cardp);

 exit:
        if_usb_submit_rx_urb_fwload(cardp);

        kfree(syncfwheader);
}

#define MRVDRV_MIN_PKT_LEN      30

static inline void process_cmdtypedata(int recvlength, struct sk_buff *skb,
                                       struct if_usb_card *cardp,
                                       struct lbs_private *priv)
{
        if (recvlength > MRVDRV_ETH_RX_PACKET_BUFFER_SIZE + MESSAGE_HEADER_LEN
            || recvlength < MRVDRV_MIN_PKT_LEN) {
                lbs_deb_usbd(&cardp->udev->dev, "Packet length is Invalid\n");
                kfree_skb(skb);
                return;
        }

        skb_reserve(skb, IPFIELD_ALIGN_OFFSET);
        skb_put(skb, recvlength);
        skb_pull(skb, MESSAGE_HEADER_LEN);

        lbs_process_rxed_packet(priv, skb);
}

static inline void process_cmdrequest(int recvlength, uint8_t *recvbuff,
                                      struct sk_buff *skb,
                                      struct if_usb_card *cardp,
                                      struct lbs_private *priv)
{
        unsigned long flags;
        u8 i;

        if (recvlength > LBS_CMD_BUFFER_SIZE) {
                lbs_deb_usbd(&cardp->udev->dev,
                             "The receive buffer is too large\n");
                kfree_skb(skb);
                return;
        }

        spin_lock_irqsave(&priv->driver_lock, flags);

        i = (priv->resp_idx == 0) ? 1 : 0;
        BUG_ON(priv->resp_len[i]);
        priv->resp_len[i] = (recvlength - MESSAGE_HEADER_LEN);
        memcpy(priv->resp_buf[i], recvbuff + MESSAGE_HEADER_LEN,
                priv->resp_len[i]);
        dev_kfree_skb_irq(skb);
        lbs_notify_command_response(priv, i);

        spin_unlock_irqrestore(&priv->driver_lock, flags);

        lbs_deb_usbd(&cardp->udev->dev,
                    "Wake up main thread to handle cmd response\n");
}

/**
 *  if_usb_receive - read the packet into the upload buffer,
 *  wake up the main thread and initialise the Rx callack
 *
 *  @urb:       pointer to &struct urb
 *  returns:    N/A
 */
static void if_usb_receive(struct urb *urb)
{
        struct if_usb_card *cardp = urb->context;
        struct sk_buff *skb = cardp->rx_skb;
        struct lbs_private *priv = cardp->priv;
        int recvlength = urb->actual_length;
        uint8_t *recvbuff = NULL;
        uint32_t recvtype = 0;
        __le32 *pkt = (__le32 *)(skb->data + IPFIELD_ALIGN_OFFSET);
        uint32_t event;

        if (recvlength) {
                if (urb->status) {
                        lbs_deb_usbd(&cardp->udev->dev, "RX URB failed: %d\n",
                                     urb->status);
                        kfree_skb(skb);
                        goto setup_for_next;
                }

                recvbuff = skb->data + IPFIELD_ALIGN_OFFSET;
                recvtype = le32_to_cpu(pkt[0]);
                lbs_deb_usbd(&cardp->udev->dev,
                            "Recv length = 0x%x, Recv type = 0x%X\n",
                            recvlength, recvtype);
        } else if (urb->status) {
                kfree_skb(skb);
                return;
        }

        switch (recvtype) {
        case CMD_TYPE_DATA:
                process_cmdtypedata(recvlength, skb, cardp, priv);
                break;

        case CMD_TYPE_REQUEST:
                process_cmdrequest(recvlength, recvbuff, skb, cardp, priv);
                break;

        case CMD_TYPE_INDICATION:
                /* Event handling */
                event = le32_to_cpu(pkt[1]);
                lbs_deb_usbd(&cardp->udev->dev, "**EVENT** 0x%X\n", event);
                kfree_skb(skb);

                /* Icky undocumented magic special case */
                if (event & 0xffff0000) {
                        u32 trycount = (event & 0xffff0000) >> 16;

                        lbs_send_tx_feedback(priv, trycount);
                } else
                        lbs_queue_event(priv, event & 0xFF);
                break;

        default:
                lbs_deb_usbd(&cardp->udev->dev, "Unknown command type 0x%X\n",
                             recvtype);
                kfree_skb(skb);
                break;
        }

setup_for_next:
        if_usb_submit_rx_urb(cardp);
}

/**
 *  if_usb_host_to_card - downloads data to FW
 *  @priv:      pointer to &struct lbs_private structure
 *  @type:      type of data
 *  @payload:   pointer to data buffer
 *  @nb:        number of bytes
 *  returns:    0 for success or negative error code
 */
static int if_usb_host_to_card(struct lbs_private *priv, uint8_t type,
                               uint8_t *payload, uint16_t nb)
{
        struct if_usb_card *cardp = priv->card;

        lbs_deb_usbd(&cardp->udev->dev,"*** type = %u\n", type);
        lbs_deb_usbd(&cardp->udev->dev,"size after = %d\n", nb);

        if (type == MVMS_CMD) {
                *(__le32 *)cardp->ep_out_buf = cpu_to_le32(CMD_TYPE_REQUEST);
                priv->dnld_sent = DNLD_CMD_SENT;
        } else {
                *(__le32 *)cardp->ep_out_buf = cpu_to_le32(CMD_TYPE_DATA);
                priv->dnld_sent = DNLD_DATA_SENT;
        }

        memcpy((cardp->ep_out_buf + MESSAGE_HEADER_LEN), payload, nb);

        return usb_tx_block(cardp, cardp->ep_out_buf, nb + MESSAGE_HEADER_LEN);
}

/**
 *  if_usb_issue_boot_command - issues Boot command to the Boot2 code
 *  @cardp:     pointer to &if_usb_card
 *  @ivalue:    1:Boot from FW by USB-Download
 *              2:Boot from FW in EEPROM
 *  returns:    0 for success or negative error code
 */
static int if_usb_issue_boot_command(struct if_usb_card *cardp, int ivalue)
{
        struct bootcmd *bootcmd = cardp->ep_out_buf;

        /* Prepare command */
        bootcmd->magic = cpu_to_le32(BOOT_CMD_MAGIC_NUMBER);
        bootcmd->cmd = ivalue;
        memset(bootcmd->pad, 0, sizeof(bootcmd->pad));

        /* Issue command */
        usb_tx_block(cardp, cardp->ep_out_buf, sizeof(*bootcmd));

        return 0;
}


/**
 *  check_fwfile_format - check the validity of Boot2/FW image
 *
 *  @data:      pointer to image
 *  @totlen:    image length
 *  returns:     0 (good) or 1 (failure)
 */
static int check_fwfile_format(const uint8_t *data, uint32_t totlen)
{
        uint32_t bincmd, exit;
        uint32_t blksize, offset, len;
        int ret;

        ret = 1;
        exit = len = 0;

        do {
                struct fwheader *fwh = (void *)data;

                bincmd = le32_to_cpu(fwh->dnldcmd);
                blksize = le32_to_cpu(fwh->datalength);
                switch (bincmd) {
                case FW_HAS_DATA_TO_RECV:
                        offset = sizeof(struct fwheader) + blksize;
                        data += offset;
                        len += offset;
                        if (len >= totlen)
                                exit = 1;
                        break;
                case FW_HAS_LAST_BLOCK:
                        exit = 1;
                        ret = 0;
                        break;
                default:
                        exit = 1;
                        break;
                }
        } while (!exit);

        if (ret)
                pr_err("firmware file format check FAIL\n");
        else
                lbs_deb_fw("firmware file format check PASS\n");

        return ret;
}

static void if_usb_prog_firmware(struct lbs_private *priv, int ret,
                                 const struct firmware *fw,
                                 const struct firmware *unused)
{
        struct if_usb_card *cardp = priv->card;
        int i = 0;
        static int reset_count = 10;

        if (ret) {
                pr_err("failed to find firmware (%d)\n", ret);
                goto done;
        }

        cardp->fw = fw;
        if (check_fwfile_format(cardp->fw->data, cardp->fw->size)) {
                ret = -EINVAL;
                goto done;
        }

        /* Cancel any pending usb business */
        usb_kill_urb(cardp->rx_urb);
        usb_kill_urb(cardp->tx_urb);

        cardp->fwlastblksent = 0;
        cardp->fwdnldover = 0;
        cardp->totalbytes = 0;
        cardp->fwfinalblk = 0;
        cardp->bootcmdresp = 0;

restart:
        if (if_usb_submit_rx_urb_fwload(cardp) < 0) {
                lbs_deb_usbd(&cardp->udev->dev, "URB submission is failed\n");
                ret = -EIO;
                goto done;
        }

        cardp->bootcmdresp = 0;
        do {
                int j = 0;
                i++;
                if_usb_issue_boot_command(cardp, BOOT_CMD_FW_BY_USB);
                /* wait for command response */
                do {
                        j++;
                        msleep_interruptible(100);
                } while (cardp->bootcmdresp == 0 && j < 10);
        } while (cardp->bootcmdresp == 0 && i < 5);

        if (cardp->bootcmdresp == BOOT_CMD_RESP_NOT_SUPPORTED) {
                /* Return to normal operation */
                ret = -EOPNOTSUPP;
                usb_kill_urb(cardp->rx_urb);
                usb_kill_urb(cardp->tx_urb);
                if (if_usb_submit_rx_urb(cardp) < 0)
                        ret = -EIO;
                goto done;
        } else if (cardp->bootcmdresp <= 0) {
                if (--reset_count >= 0) {
                        if_usb_reset_device(cardp);
                        goto restart;
                }
                ret = -EIO;
                goto done;
        }

        i = 0;

        cardp->totalbytes = 0;
        cardp->fwlastblksent = 0;
        cardp->CRC_OK = 1;
        cardp->fwdnldover = 0;
        cardp->fwseqnum = -1;
        cardp->totalbytes = 0;
        cardp->fwfinalblk = 0;

        /* Send the first firmware packet... */
        if_usb_send_fw_pkt(cardp);

        /* ... and wait for the process to complete */
        wait_event_interruptible(cardp->fw_wq, cardp->surprise_removed || cardp->fwdnldover);

        timer_delete_sync(&cardp->fw_timeout);
        usb_kill_urb(cardp->rx_urb);

        if (!cardp->fwdnldover) {
                pr_info("failed to load fw, resetting device!\n");
                if (--reset_count >= 0) {
                        if_usb_reset_device(cardp);
                        goto restart;
                }

                pr_info("FW download failure, time = %d ms\n", i * 100);
                ret = -EIO;
                goto done;
        }

        cardp->priv->fw_ready = 1;
        if_usb_submit_rx_urb(cardp);

        if (lbs_start_card(priv))
                goto done;

        if_usb_setup_firmware(priv);

        /*
         * EHS_REMOVE_WAKEUP is not supported on all versions of the firmware.
         */
        priv->wol_criteria = EHS_REMOVE_WAKEUP;
        if (lbs_host_sleep_cfg(priv, priv->wol_criteria, NULL))
                priv->ehs_remove_supported = false;

 done:
        cardp->fw = NULL;
}


#ifdef CONFIG_PM
static int if_usb_suspend(struct usb_interface *intf, pm_message_t message)
{
        struct if_usb_card *cardp = usb_get_intfdata(intf);
        struct lbs_private *priv = cardp->priv;
        int ret;

        if (priv->psstate != PS_STATE_FULL_POWER) {
                ret = -1;
                goto out;
        }

#ifdef CONFIG_OLPC
        if (machine_is_olpc()) {
                if (priv->wol_criteria == EHS_REMOVE_WAKEUP)
                        olpc_ec_wakeup_clear(EC_SCI_SRC_WLAN);
                else
                        olpc_ec_wakeup_set(EC_SCI_SRC_WLAN);
        }
#endif

        ret = lbs_suspend(priv);
        if (ret)
                goto out;

        /* Unlink tx & rx urb */
        usb_kill_urb(cardp->tx_urb);
        usb_kill_urb(cardp->rx_urb);

 out:
        return ret;
}

static int if_usb_resume(struct usb_interface *intf)
{
        struct if_usb_card *cardp = usb_get_intfdata(intf);
        struct lbs_private *priv = cardp->priv;

        if_usb_submit_rx_urb(cardp);

        lbs_resume(priv);

        return 0;
}
#else
#define if_usb_suspend NULL
#define if_usb_resume NULL
#endif

static struct usb_driver if_usb_driver = {
        .name = DRV_NAME,
        .probe = if_usb_probe,
        .disconnect = if_usb_disconnect,
        .id_table = if_usb_table,
        .suspend = if_usb_suspend,
        .resume = if_usb_resume,
        .reset_resume = if_usb_resume,
        .disable_hub_initiated_lpm = 1,
};

module_usb_driver(if_usb_driver);

MODULE_DESCRIPTION("8388 USB WLAN Driver");
MODULE_AUTHOR("Marvell International Ltd. and Red Hat, Inc.");
MODULE_LICENSE("GPL");