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bcm203x.c

/*
 *
 *  Broadcom Blutonium firmware driver
 *
 *  Copyright (C) 2003  Maxim Krasnyansky <maxk@qualcomm.com>
 *  Copyright (C) 2003  Marcel Holtmann <marcel@holtmann.org>
 *
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */

#include <linux/module.h>

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

#include <linux/device.h>
#include <linux/firmware.h>

#include <linux/usb.h>

#include <net/bluetooth/bluetooth.h>

#ifndef CONFIG_BT_HCIBCM203X_DEBUG
#undef  BT_DBG
#define BT_DBG(D...)
#endif

#define VERSION "1.1"

static int ignore = 0;

static struct usb_device_id bcm203x_table[] = {
      /* Broadcom Blutonium (BCM2033) */
      { USB_DEVICE(0x0a5c, 0x2033) },

      { }   /* Terminating entry */
};

MODULE_DEVICE_TABLE(usb, bcm203x_table);

#define BCM203X_ERROR         0
#define BCM203X_RESET         1
#define BCM203X_LOAD_MINIDRV  2
#define BCM203X_SELECT_MEMORY 3
#define BCM203X_CHECK_MEMORY  4
#define BCM203X_LOAD_FIRMWARE 5
#define BCM203X_CHECK_FIRMWARE      6

#define BCM203X_IN_EP         0x81
#define BCM203X_OUT_EP        0x02

struct bcm203x_data {
      struct usb_device *udev;

      unsigned long           state;

      struct work_struct      work;

      struct urb        *urb;
      unsigned char           *buffer;

      unsigned char           *fw_data;
      unsigned int            fw_size;
      unsigned int            fw_sent;
};

static void bcm203x_complete(struct urb *urb)
{
      struct bcm203x_data *data = urb->context;
      struct usb_device *udev = urb->dev;
      int len;

      BT_DBG("udev %p urb %p", udev, urb);

      if (urb->status) {
            BT_ERR("URB failed with status %d", urb->status);
            data->state = BCM203X_ERROR;
            return;
      }

      switch (data->state) {
      case BCM203X_LOAD_MINIDRV:
            memcpy(data->buffer, "#", 1);

            usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, BCM203X_OUT_EP),
                        data->buffer, 1, bcm203x_complete, data);

            data->state = BCM203X_SELECT_MEMORY;

            schedule_work(&data->work);
            break;

      case BCM203X_SELECT_MEMORY:
            usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, BCM203X_IN_EP),
                        data->buffer, 32, bcm203x_complete, data, 1);

            data->state = BCM203X_CHECK_MEMORY;

            if (usb_submit_urb(data->urb, GFP_ATOMIC) < 0)
                  BT_ERR("Can't submit URB");
            break;

      case BCM203X_CHECK_MEMORY:
            if (data->buffer[0] != '#') {
                  BT_ERR("Memory select failed");
                  data->state = BCM203X_ERROR;
                  break;
            }

            data->state = BCM203X_LOAD_FIRMWARE;

      case BCM203X_LOAD_FIRMWARE:
            if (data->fw_sent == data->fw_size) {
                  usb_fill_int_urb(urb, udev, usb_rcvintpipe(udev, BCM203X_IN_EP),
                        data->buffer, 32, bcm203x_complete, data, 1);

                  data->state = BCM203X_CHECK_FIRMWARE;
            } else {
                  len = min_t(uint, data->fw_size - data->fw_sent, 4096);

                  usb_fill_bulk_urb(urb, udev, usb_sndbulkpipe(udev, BCM203X_OUT_EP),
                        data->fw_data + data->fw_sent, len, bcm203x_complete, data);

                  data->fw_sent += len;
            }

            if (usb_submit_urb(data->urb, GFP_ATOMIC) < 0)
                  BT_ERR("Can't submit URB");
            break;

      case BCM203X_CHECK_FIRMWARE:
            if (data->buffer[0] != '.') {
                  BT_ERR("Firmware loading failed");
                  data->state = BCM203X_ERROR;
                  break;
            }

            data->state = BCM203X_RESET;
            break;
      }
}

static void bcm203x_work(struct work_struct *work)
{
      struct bcm203x_data *data =
            container_of(work, struct bcm203x_data, work);

      if (usb_submit_urb(data->urb, GFP_ATOMIC) < 0)
            BT_ERR("Can't submit URB");
}

static int bcm203x_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
      const struct firmware *firmware;
      struct usb_device *udev = interface_to_usbdev(intf);
      struct bcm203x_data *data;
      int size;

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

      if (ignore || (intf->cur_altsetting->desc.bInterfaceNumber != 0))
            return -ENODEV;

      data = kzalloc(sizeof(*data), GFP_KERNEL);
      if (!data) {
            BT_ERR("Can't allocate memory for data structure");
            return -ENOMEM;
      }

      data->udev  = udev;
      data->state = BCM203X_LOAD_MINIDRV;

      data->urb = usb_alloc_urb(0, GFP_KERNEL);
      if (!data->urb) {
            BT_ERR("Can't allocate URB");
            kfree(data);
            return -ENOMEM;
      }

      if (request_firmware(&firmware, "BCM2033-MD.hex", &udev->dev) < 0) {
            BT_ERR("Mini driver request failed");
            usb_free_urb(data->urb);
            kfree(data);
            return -EIO;
      }

      BT_DBG("minidrv data %p size %d", firmware->data, firmware->size);

      size = max_t(uint, firmware->size, 4096);

      data->buffer = kmalloc(size, GFP_KERNEL);
      if (!data->buffer) {
            BT_ERR("Can't allocate memory for mini driver");
            release_firmware(firmware);
            usb_free_urb(data->urb);
            kfree(data);
            return -ENOMEM;
      }

      memcpy(data->buffer, firmware->data, firmware->size);

      usb_fill_bulk_urb(data->urb, udev, usb_sndbulkpipe(udev, BCM203X_OUT_EP),
                  data->buffer, firmware->size, bcm203x_complete, data);

      release_firmware(firmware);

      if (request_firmware(&firmware, "BCM2033-FW.bin", &udev->dev) < 0) {
            BT_ERR("Firmware request failed");
            usb_free_urb(data->urb);
            kfree(data->buffer);
            kfree(data);
            return -EIO;
      }

      BT_DBG("firmware data %p size %d", firmware->data, firmware->size);

      data->fw_data = kmalloc(firmware->size, GFP_KERNEL);
      if (!data->fw_data) {
            BT_ERR("Can't allocate memory for firmware image");
            release_firmware(firmware);
            usb_free_urb(data->urb);
            kfree(data->buffer);
            kfree(data);
            return -ENOMEM;
      }

      memcpy(data->fw_data, firmware->data, firmware->size);
      data->fw_size = firmware->size;
      data->fw_sent = 0;

      release_firmware(firmware);

      INIT_WORK(&data->work, bcm203x_work);

      usb_set_intfdata(intf, data);

      schedule_work(&data->work);

      return 0;
}

static void bcm203x_disconnect(struct usb_interface *intf)
{
      struct bcm203x_data *data = usb_get_intfdata(intf);

      BT_DBG("intf %p", intf);

      usb_kill_urb(data->urb);

      usb_set_intfdata(intf, NULL);

      usb_free_urb(data->urb);
      kfree(data->fw_data);
      kfree(data->buffer);
      kfree(data);
}

static struct usb_driver bcm203x_driver = {
      .name       = "bcm203x",
      .probe            = bcm203x_probe,
      .disconnect = bcm203x_disconnect,
      .id_table   = bcm203x_table,
};

static int __init bcm203x_init(void)
{
      int err;

      BT_INFO("Broadcom Blutonium firmware driver ver %s", VERSION);

      err = usb_register(&bcm203x_driver);
      if (err < 0)
            BT_ERR("Failed to register USB driver");

      return err;
}

static void __exit bcm203x_exit(void)
{
      usb_deregister(&bcm203x_driver);
}

module_init(bcm203x_init);
module_exit(bcm203x_exit);

module_param(ignore, bool, 0644);
MODULE_PARM_DESC(ignore, "Ignore devices from the matching table");

MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
MODULE_DESCRIPTION("Broadcom Blutonium firmware driver ver " VERSION);
MODULE_VERSION(VERSION);
MODULE_LICENSE("GPL");
MODULE_FIRMWARE("BCM2033-MD.hex");
MODULE_FIRMWARE("BCM2033-FW.bin");

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