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btsdio.c

/*
 *
 *  Generic Bluetooth SDIO driver
 *
 *  Copyright (C) 2007  Cambridge Silicon Radio Ltd.
 *  Copyright (C) 2007  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/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/mmc/sdio_ids.h>
#include <linux/mmc/sdio_func.h>

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

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

#define VERSION "0.1"

static const struct sdio_device_id btsdio_table[] = {
      /* Generic Bluetooth Type-A SDIO device */
      { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_A) },

      /* Generic Bluetooth Type-B SDIO device */
      { SDIO_DEVICE_CLASS(SDIO_CLASS_BT_B) },

      { }   /* Terminating entry */
};

MODULE_DEVICE_TABLE(sdio, btsdio_table);

struct btsdio_data {
      struct hci_dev   *hdev;
      struct sdio_func *func;

      struct work_struct work;

      struct sk_buff_head txq;
};

#define REG_RDAT     0x00     /* Receiver Data */
#define REG_TDAT     0x00     /* Transmitter Data */
#define REG_PC_RRT   0x10     /* Read Packet Control */
#define REG_PC_WRT   0x11     /* Write Packet Control */
#define REG_RTC_STAT 0x12     /* Retry Control Status */
#define REG_RTC_SET  0x12     /* Retry Control Set */
#define REG_INTRD    0x13     /* Interrupt Indication */
#define REG_CL_INTRD 0x13     /* Interrupt Clear */
#define REG_EN_INTRD 0x14     /* Interrupt Enable */
#define REG_MD_STAT  0x20     /* Bluetooth Mode Status */

static int btsdio_tx_packet(struct btsdio_data *data, struct sk_buff *skb)
{
      int err;

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

      /* Prepend Type-A header */
      skb_push(skb, 4);
      skb->data[0] = (skb->len & 0x0000ff);
      skb->data[1] = (skb->len & 0x00ff00) >> 8;
      skb->data[2] = (skb->len & 0xff0000) >> 16;
      skb->data[3] = bt_cb(skb)->pkt_type;

      err = sdio_writesb(data->func, REG_TDAT, skb->data, skb->len);
      if (err < 0) {
            sdio_writeb(data->func, 0x01, REG_PC_WRT, NULL);
            return err;
      }

      data->hdev->stat.byte_tx += skb->len;

      kfree_skb(skb);

      return 0;
}

static void btsdio_work(struct work_struct *work)
{
      struct btsdio_data *data = container_of(work, struct btsdio_data, work);
      struct sk_buff *skb;
      int err;

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

      sdio_claim_host(data->func);

      while ((skb = skb_dequeue(&data->txq))) {
            err = btsdio_tx_packet(data, skb);
            if (err < 0) {
                  data->hdev->stat.err_tx++;
                  skb_queue_head(&data->txq, skb);
                  break;
            }
      }

      sdio_release_host(data->func);
}

static int btsdio_rx_packet(struct btsdio_data *data)
{
      u8 hdr[4] __attribute__ ((aligned(4)));
      struct sk_buff *skb;
      int err, len;

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

      err = sdio_readsb(data->func, hdr, REG_RDAT, 4);
      if (err < 0)
            return err;

      len = hdr[0] | (hdr[1] << 8) | (hdr[2] << 16);
      if (len < 4 || len > 65543)
            return -EILSEQ;

      skb = bt_skb_alloc(len - 4, GFP_KERNEL);
      if (!skb) {
            /* Out of memory. Prepare a read retry and just
             * return with the expectation that the next time
             * we're called we'll have more memory. */
            return -ENOMEM;
      }

      skb_put(skb, len - 4);

      err = sdio_readsb(data->func, skb->data, REG_RDAT, len - 4);
      if (err < 0) {
            kfree(skb);
            return err;
      }

      data->hdev->stat.byte_rx += len;

      skb->dev = (void *) data->hdev;
      bt_cb(skb)->pkt_type = hdr[3];

      err = hci_recv_frame(skb);
      if (err < 0) {
            kfree(skb);
            return err;
      }

      sdio_writeb(data->func, 0x00, REG_PC_RRT, NULL);

      return 0;
}

static void btsdio_interrupt(struct sdio_func *func)
{
      struct btsdio_data *data = sdio_get_drvdata(func);
      int intrd;

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

      intrd = sdio_readb(func, REG_INTRD, NULL);
      if (intrd & 0x01) {
            sdio_writeb(func, 0x01, REG_CL_INTRD, NULL);

            if (btsdio_rx_packet(data) < 0) {
                  data->hdev->stat.err_rx++;
                  sdio_writeb(data->func, 0x01, REG_PC_RRT, NULL);
            }
      }
}

static int btsdio_open(struct hci_dev *hdev)
{
      struct btsdio_data *data = hdev->driver_data;
      int err;

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

      if (test_and_set_bit(HCI_RUNNING, &hdev->flags))
            return 0;

      sdio_claim_host(data->func);

      err = sdio_enable_func(data->func);
      if (err < 0) {
            clear_bit(HCI_RUNNING, &hdev->flags);
            goto release;
      }

      err = sdio_claim_irq(data->func, btsdio_interrupt);
      if (err < 0) {
            sdio_disable_func(data->func);
            clear_bit(HCI_RUNNING, &hdev->flags);
            goto release;
      }

      if (data->func->class == SDIO_CLASS_BT_B)
            sdio_writeb(data->func, 0x00, REG_MD_STAT, NULL);

      sdio_writeb(data->func, 0x01, REG_EN_INTRD, NULL);

release:
      sdio_release_host(data->func);

      return err;
}

static int btsdio_close(struct hci_dev *hdev)
{
      struct btsdio_data *data = hdev->driver_data;

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

      if (!test_and_clear_bit(HCI_RUNNING, &hdev->flags))
            return 0;

      sdio_claim_host(data->func);

      sdio_writeb(data->func, 0x00, REG_EN_INTRD, NULL);

      sdio_release_irq(data->func);
      sdio_disable_func(data->func);

      sdio_release_host(data->func);

      return 0;
}

static int btsdio_flush(struct hci_dev *hdev)
{
      struct btsdio_data *data = hdev->driver_data;

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

      skb_queue_purge(&data->txq);

      return 0;
}

static int btsdio_send_frame(struct sk_buff *skb)
{
      struct hci_dev *hdev = (struct hci_dev *) skb->dev;
      struct btsdio_data *data = hdev->driver_data;

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

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

      switch (bt_cb(skb)->pkt_type) {
      case HCI_COMMAND_PKT:
            hdev->stat.cmd_tx++;
            break;

      case HCI_ACLDATA_PKT:
            hdev->stat.acl_tx++;
            break;

      case HCI_SCODATA_PKT:
            hdev->stat.sco_tx++;
            break;

      default:
            return -EILSEQ;
      }

      skb_queue_tail(&data->txq, skb);

      schedule_work(&data->work);

      return 0;
}

static void btsdio_destruct(struct hci_dev *hdev)
{
      struct btsdio_data *data = hdev->driver_data;

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

      kfree(data);
}

static int btsdio_probe(struct sdio_func *func,
                        const struct sdio_device_id *id)
{
      struct btsdio_data *data;
      struct hci_dev *hdev;
      struct sdio_func_tuple *tuple = func->tuples;
      int err;

      BT_DBG("func %p id %p class 0x%04x", func, id, func->class);

      while (tuple) {
            BT_DBG("code 0x%x size %d", tuple->code, tuple->size);
            tuple = tuple->next;
      }

      data = kzalloc(sizeof(*data), GFP_KERNEL);
      if (!data)
            return -ENOMEM;

      data->func = func;

      INIT_WORK(&data->work, btsdio_work);

      skb_queue_head_init(&data->txq);

      hdev = hci_alloc_dev();
      if (!hdev) {
            kfree(data);
            return -ENOMEM;
      }

      hdev->type = HCI_SDIO;
      hdev->driver_data = data;

      data->hdev = hdev;

      SET_HCIDEV_DEV(hdev, &func->dev);

      hdev->open     = btsdio_open;
      hdev->close    = btsdio_close;
      hdev->flush    = btsdio_flush;
      hdev->send     = btsdio_send_frame;
      hdev->destruct = btsdio_destruct;

      hdev->owner = THIS_MODULE;

      err = hci_register_dev(hdev);
      if (err < 0) {
            hci_free_dev(hdev);
            kfree(data);
            return err;
      }

      sdio_set_drvdata(func, data);

      return 0;
}

static void btsdio_remove(struct sdio_func *func)
{
      struct btsdio_data *data = sdio_get_drvdata(func);
      struct hci_dev *hdev;

      BT_DBG("func %p", func);

      if (!data)
            return;

      hdev = data->hdev;

      sdio_set_drvdata(func, NULL);

      hci_unregister_dev(hdev);

      hci_free_dev(hdev);
}

static struct sdio_driver btsdio_driver = {
      .name       = "btsdio",
      .probe            = btsdio_probe,
      .remove           = btsdio_remove,
      .id_table   = btsdio_table,
};

static int __init btsdio_init(void)
{
      BT_INFO("Generic Bluetooth SDIO driver ver %s", VERSION);

      return sdio_register_driver(&btsdio_driver);
}

static void __exit btsdio_exit(void)
{
      sdio_unregister_driver(&btsdio_driver);
}

module_init(btsdio_init);
module_exit(btsdio_exit);

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

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