// SPDX-License-Identifier: GPL-2.0-or-later

  /*
   *
   *  Digianswer Bluetooth USB driver
   *

   *  Copyright (C) 2004-2007  Marcel Holtmann <marcel@holtmann.org>

   */

  #include <linux/kernel.h>

  #include <linux/module.h>

  #include <linux/init.h>
  #include <linux/slab.h>
  #include <linux/types.h>

  #include <linux/sched.h>

  #include <linux/errno.h>

  #include <linux/skbuff.h>

  
  #include <linux/usb.h>
  
  #include <net/bluetooth/bluetooth.h>
  #include <net/bluetooth/hci_core.h>

  #include "h4_recv.h"

  
  #define VERSION "0.11"

  static const struct usb_device_id bpa10x_table[] = {

  	/* Tektronix BPA 100/105 (Digianswer) */
  	{ USB_DEVICE(0x08fd, 0x0002) },
  
  	{ }	/* Terminating entry */
  };
  
  MODULE_DEVICE_TABLE(usb, bpa10x_table);

  struct bpa10x_data {

  	struct hci_dev    *hdev;
  	struct usb_device *udev;

  	struct usb_anchor tx_anchor;
  	struct usb_anchor rx_anchor;

  	struct sk_buff *rx_skb[2];

  };

  static void bpa10x_tx_complete(struct urb *urb)

  {

  	struct sk_buff *skb = urb->context;
  	struct hci_dev *hdev = (struct hci_dev *) skb->dev;

  	BT_DBG("%s urb %p status %d count %d", hdev->name,
  					urb, urb->status, urb->actual_length);

  	if (!test_bit(HCI_RUNNING, &hdev->flags))
  		goto done;
  
  	if (!urb->status)
  		hdev->stat.byte_tx += urb->transfer_buffer_length;

  	else

  		hdev->stat.err_tx++;

  done:
  	kfree(urb->setup_packet);

  	kfree_skb(skb);
  }

  #define HCI_VENDOR_HDR_SIZE 5
  
  #define HCI_RECV_VENDOR \
  	.type = HCI_VENDOR_PKT, \
  	.hlen = HCI_VENDOR_HDR_SIZE, \
  	.loff = 3, \
  	.lsize = 2, \
  	.maxlen = HCI_MAX_FRAME_SIZE
  
  static const struct h4_recv_pkt bpa10x_recv_pkts[] = {
  	{ H4_RECV_ACL,     .recv = hci_recv_frame },
  	{ H4_RECV_SCO,     .recv = hci_recv_frame },
  	{ H4_RECV_EVENT,   .recv = hci_recv_frame },
  	{ HCI_RECV_VENDOR, .recv = hci_recv_diag  },
  };

  static void bpa10x_rx_complete(struct urb *urb)
  {
  	struct hci_dev *hdev = urb->context;

  	struct bpa10x_data *data = hci_get_drvdata(hdev);

  	int err;

  	BT_DBG("%s urb %p status %d count %d", hdev->name,
  					urb, urb->status, urb->actual_length);

  	if (!test_bit(HCI_RUNNING, &hdev->flags))
  		return;

  	if (urb->status == 0) {

  		bool idx = usb_pipebulk(urb->pipe);
  
  		data->rx_skb[idx] = h4_recv_buf(hdev, data->rx_skb[idx],

  						urb->transfer_buffer,

  						urb->actual_length,
  						bpa10x_recv_pkts,
  						ARRAY_SIZE(bpa10x_recv_pkts));
  		if (IS_ERR(data->rx_skb[idx])) {

  			bt_dev_err(hdev, "corrupted event packet");

  			hdev->stat.err_rx++;

  			data->rx_skb[idx] = NULL;

  		}

  	}

  	usb_anchor_urb(urb, &data->rx_anchor);
  
  	err = usb_submit_urb(urb, GFP_ATOMIC);
  	if (err < 0) {

  		bt_dev_err(hdev, "urb %p failed to resubmit (%d)", urb, -err);

  		usb_unanchor_urb(urb);

  	}
  }

  static inline int bpa10x_submit_intr_urb(struct hci_dev *hdev)

  {

  	struct bpa10x_data *data = hci_get_drvdata(hdev);

  	struct urb *urb;
  	unsigned char *buf;
  	unsigned int pipe;
  	int err, size = 16;

  	BT_DBG("%s", hdev->name);

  	urb = usb_alloc_urb(0, GFP_KERNEL);
  	if (!urb)
  		return -ENOMEM;

  	buf = kmalloc(size, GFP_KERNEL);
  	if (!buf) {
  		usb_free_urb(urb);
  		return -ENOMEM;
  	}

  	pipe = usb_rcvintpipe(data->udev, 0x81);

  	usb_fill_int_urb(urb, data->udev, pipe, buf, size,
  						bpa10x_rx_complete, hdev, 1);

  	urb->transfer_flags |= URB_FREE_BUFFER;

  	usb_anchor_urb(urb, &data->rx_anchor);

  	err = usb_submit_urb(urb, GFP_KERNEL);
  	if (err < 0) {

  		bt_dev_err(hdev, "urb %p submission failed (%d)", urb, -err);

  		usb_unanchor_urb(urb);

  	}

  	usb_free_urb(urb);

  	return err;

  }

  static inline int bpa10x_submit_bulk_urb(struct hci_dev *hdev)

  {

  	struct bpa10x_data *data = hci_get_drvdata(hdev);

  	struct urb *urb;

  	unsigned char *buf;

  	unsigned int pipe;
  	int err, size = 64;

  	BT_DBG("%s", hdev->name);

  	urb = usb_alloc_urb(0, GFP_KERNEL);

  	if (!urb)

  		return -ENOMEM;

  	buf = kmalloc(size, GFP_KERNEL);

  	if (!buf) {
  		usb_free_urb(urb);

  		return -ENOMEM;

  	}

  	pipe = usb_rcvbulkpipe(data->udev, 0x82);

  	usb_fill_bulk_urb(urb, data->udev, pipe,
  					buf, size, bpa10x_rx_complete, hdev);

  	urb->transfer_flags |= URB_FREE_BUFFER;

  	usb_anchor_urb(urb, &data->rx_anchor);

  	err = usb_submit_urb(urb, GFP_KERNEL);
  	if (err < 0) {

  		bt_dev_err(hdev, "urb %p submission failed (%d)", urb, -err);

  		usb_unanchor_urb(urb);

  	}

  	usb_free_urb(urb);

  
  	return err;

  }
  
  static int bpa10x_open(struct hci_dev *hdev)
  {

  	struct bpa10x_data *data = hci_get_drvdata(hdev);

  	int err;

  	BT_DBG("%s", hdev->name);

  	err = bpa10x_submit_intr_urb(hdev);
  	if (err < 0)
  		goto error;

  	err = bpa10x_submit_bulk_urb(hdev);
  	if (err < 0)
  		goto error;

  	return 0;

  error:
  	usb_kill_anchored_urbs(&data->rx_anchor);

  	return err;
  }
  
  static int bpa10x_close(struct hci_dev *hdev)
  {

  	struct bpa10x_data *data = hci_get_drvdata(hdev);

  	BT_DBG("%s", hdev->name);

  	usb_kill_anchored_urbs(&data->rx_anchor);

  
  	return 0;
  }
  
  static int bpa10x_flush(struct hci_dev *hdev)
  {

  	struct bpa10x_data *data = hci_get_drvdata(hdev);

  	BT_DBG("%s", hdev->name);

  	usb_kill_anchored_urbs(&data->tx_anchor);

  
  	return 0;
  }

  static int bpa10x_setup(struct hci_dev *hdev)
  {

  	static const u8 req[] = { 0x07 };

  	struct sk_buff *skb;
  
  	BT_DBG("%s", hdev->name);
  
  	/* Read revision string */
  	skb = __hci_cmd_sync(hdev, 0xfc0e, sizeof(req), req, HCI_INIT_TIMEOUT);
  	if (IS_ERR(skb))
  		return PTR_ERR(skb);

  	bt_dev_info(hdev, "%s", (char *)(skb->data + 1));

  	hci_set_fw_info(hdev, "%s", skb->data + 1);

  	kfree_skb(skb);
  	return 0;
  }

  static int bpa10x_send_frame(struct hci_dev *hdev, struct sk_buff *skb)

  {

  	struct bpa10x_data *data = hci_get_drvdata(hdev);

  	struct usb_ctrlrequest *dr;
  	struct urb *urb;
  	unsigned int pipe;
  	int err;

  	BT_DBG("%s", hdev->name);

  	skb->dev = (void *) hdev;

  	urb = usb_alloc_urb(0, GFP_KERNEL);

  	if (!urb)
  		return -ENOMEM;

  
  	/* Prepend skb with frame type */

  	*(u8 *)skb_push(skb, 1) = hci_skb_pkt_type(skb);

  	switch (hci_skb_pkt_type(skb)) {

  	case HCI_COMMAND_PKT:

  		dr = kmalloc(sizeof(*dr), GFP_KERNEL);

  		if (!dr) {
  			usb_free_urb(urb);
  			return -ENOMEM;
  		}
  
  		dr->bRequestType = USB_TYPE_VENDOR;
  		dr->bRequest     = 0;
  		dr->wIndex       = 0;
  		dr->wValue       = 0;
  		dr->wLength      = __cpu_to_le16(skb->len);
  
  		pipe = usb_sndctrlpipe(data->udev, 0x00);
  
  		usb_fill_control_urb(urb, data->udev, pipe, (void *) dr,
  				skb->data, skb->len, bpa10x_tx_complete, skb);

  		hdev->stat.cmd_tx++;

  		break;
  
  	case HCI_ACLDATA_PKT:

  		pipe = usb_sndbulkpipe(data->udev, 0x02);
  
  		usb_fill_bulk_urb(urb, data->udev, pipe,
  				skb->data, skb->len, bpa10x_tx_complete, skb);

  		hdev->stat.acl_tx++;

  		break;
  
  	case HCI_SCODATA_PKT:

  		pipe = usb_sndbulkpipe(data->udev, 0x02);
  
  		usb_fill_bulk_urb(urb, data->udev, pipe,
  				skb->data, skb->len, bpa10x_tx_complete, skb);

  		hdev->stat.sco_tx++;

  		break;

  	default:

  		usb_free_urb(urb);

  		return -EILSEQ;
  	}
  
  	usb_anchor_urb(urb, &data->tx_anchor);

  	err = usb_submit_urb(urb, GFP_KERNEL);

  	if (err < 0) {

  		bt_dev_err(hdev, "urb %p submission failed", urb);

  		kfree(urb->setup_packet);
  		usb_unanchor_urb(urb);
  	}

  	usb_free_urb(urb);

  	return err;

  }

  static int bpa10x_set_diag(struct hci_dev *hdev, bool enable)
  {
  	const u8 req[] = { 0x00, enable };
  	struct sk_buff *skb;
  
  	BT_DBG("%s", hdev->name);
  
  	if (!test_bit(HCI_RUNNING, &hdev->flags))
  		return -ENETDOWN;
  
  	/* Enable sniffer operation */
  	skb = __hci_cmd_sync(hdev, 0xfc0e, sizeof(req), req, HCI_INIT_TIMEOUT);
  	if (IS_ERR(skb))
  		return PTR_ERR(skb);
  
  	kfree_skb(skb);
  	return 0;
  }

  static int bpa10x_probe(struct usb_interface *intf,
  			const struct usb_device_id *id)

  {

  	struct bpa10x_data *data;

  	struct hci_dev *hdev;

  	int err;
  
  	BT_DBG("intf %p id %p", intf, id);

  	if (intf->cur_altsetting->desc.bInterfaceNumber != 0)

  		return -ENODEV;

  	data = devm_kzalloc(&intf->dev, sizeof(*data), GFP_KERNEL);

  	if (!data)

  		return -ENOMEM;

  	data->udev = interface_to_usbdev(intf);

  	init_usb_anchor(&data->tx_anchor);
  	init_usb_anchor(&data->rx_anchor);

  
  	hdev = hci_alloc_dev();

  	if (!hdev)

  		return -ENOMEM;

  	hdev->bus = HCI_USB;

  	hci_set_drvdata(hdev, data);

  
  	data->hdev = hdev;

  	SET_HCIDEV_DEV(hdev, &intf->dev);

  	hdev->open     = bpa10x_open;
  	hdev->close    = bpa10x_close;
  	hdev->flush    = bpa10x_flush;

  	hdev->setup    = bpa10x_setup;

  	hdev->send     = bpa10x_send_frame;

  	hdev->set_diag = bpa10x_set_diag;

  	set_bit(HCI_QUIRK_RESET_ON_CLOSE, &hdev->quirks);

  	err = hci_register_dev(hdev);
  	if (err < 0) {

  		hci_free_dev(hdev);
  		return err;
  	}
  
  	usb_set_intfdata(intf, data);
  
  	return 0;
  }
  
  static void bpa10x_disconnect(struct usb_interface *intf)
  {
  	struct bpa10x_data *data = usb_get_intfdata(intf);

  
  	BT_DBG("intf %p", intf);

  	if (!data)

  		return;
  
  	usb_set_intfdata(intf, NULL);

  	hci_unregister_dev(data->hdev);

  	hci_free_dev(data->hdev);

  	kfree_skb(data->rx_skb[0]);
  	kfree_skb(data->rx_skb[1]);

  }
  
  static struct usb_driver bpa10x_driver = {

  	.name		= "bpa10x",
  	.probe		= bpa10x_probe,
  	.disconnect	= bpa10x_disconnect,
  	.id_table	= bpa10x_table,

  	.disable_hub_initiated_lpm = 1,

  };

  module_usb_driver(bpa10x_driver);

  MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
  MODULE_DESCRIPTION("Digianswer Bluetooth USB driver ver " VERSION);
  MODULE_VERSION(VERSION);
  MODULE_LICENSE("GPL");