drivers/bluetooth/bt3c_cs.c - kernel/msm-4.19 - Gitiles

 /*
  *
  *  Driver for the 3Com Bluetooth PCMCIA card
  *
  *  Copyright (C) 2001-2002  Marcel Holtmann <marcel@holtmann.org>
  *                           Jose Orlando Pereira <jop@di.uminho.pt>
  *
  *
  *  This program is free software; you can redistribute it and/or modify
  *  it under the terms of the GNU General Public License version 2 as
  *  published by the Free Software Foundation;
  *
  *  Software distributed under the License is distributed on an "AS
  *  IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
  *  implied. See the License for the specific language governing
  *  rights and limitations under the License.
  *
  *  The initial developer of the original code is David A. Hinds
  *  <dahinds@users.sourceforge.net>.  Portions created by David A. Hinds
  *  are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
  *
  */

 #include <linux/module.h>

 #include <linux/kernel.h>
 #include <linux/init.h>
 #include <linux/slab.h>
 #include <linux/types.h>
 #include <linux/delay.h>
 #include <linux/errno.h>
 #include <linux/ptrace.h>
 #include <linux/ioport.h>
 #include <linux/spinlock.h>
 #include <linux/moduleparam.h>

 #include <linux/skbuff.h>
 #include <linux/string.h>
 #include <linux/serial.h>
 #include <linux/serial_reg.h>
 #include <linux/bitops.h>
 #include <asm/io.h>

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

 #include <pcmcia/cistpl.h>
 #include <pcmcia/ciscode.h>
 #include <pcmcia/ds.h>
 #include <pcmcia/cisreg.h>

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


 /* ======================== Module parameters ======================== */


 MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
 MODULE_DESCRIPTION("Bluetooth driver for the 3Com Bluetooth PCMCIA card");
 MODULE_LICENSE("GPL");
 MODULE_FIRMWARE("BT3CPCC.bin");


 /* ======================== Local structures ======================== */


 struct bt3c_info {
 	struct pcmcia_device *p_dev;

 	struct hci_dev *hdev;

 	spinlock_t lock;		/* For serializing operations */

 	struct sk_buff_head txq;
 	unsigned long tx_state;

 	unsigned long rx_state;
 	unsigned long rx_count;
 	struct sk_buff *rx_skb;
 };


 static int bt3c_config(struct pcmcia_device *link);
 static void bt3c_release(struct pcmcia_device *link);

 static void bt3c_detach(struct pcmcia_device *p_dev);


 /* Transmit states  */
 #define XMIT_SENDING  1
 #define XMIT_WAKEUP   2
 #define XMIT_WAITING  8

 /* Receiver states */
 #define RECV_WAIT_PACKET_TYPE   0
 #define RECV_WAIT_EVENT_HEADER  1
 #define RECV_WAIT_ACL_HEADER    2
 #define RECV_WAIT_SCO_HEADER    3
 #define RECV_WAIT_DATA          4


 /* ======================== Special I/O functions ======================== */


 #define DATA_L   0
 #define DATA_H   1
 #define ADDR_L   2
 #define ADDR_H   3
 #define CONTROL  4


 static inline void bt3c_address(unsigned int iobase, unsigned short addr)
 {
 	outb(addr & 0xff, iobase + ADDR_L);
 	outb((addr >> 8) & 0xff, iobase + ADDR_H);
 }


 static inline void bt3c_put(unsigned int iobase, unsigned short value)
 {
 	outb(value & 0xff, iobase + DATA_L);
 	outb((value >> 8) & 0xff, iobase + DATA_H);
 }


 static inline void bt3c_io_write(unsigned int iobase, unsigned short addr, unsigned short value)
 {
 	bt3c_address(iobase, addr);
 	bt3c_put(iobase, value);
 }


 static inline unsigned short bt3c_get(unsigned int iobase)
 {
 	unsigned short value = inb(iobase + DATA_L);

 	value |= inb(iobase + DATA_H) << 8;

 	return value;
 }


 static inline unsigned short bt3c_read(unsigned int iobase, unsigned short addr)
 {
 	bt3c_address(iobase, addr);

 	return bt3c_get(iobase);
 }


 /* ======================== Interrupt handling ======================== */


 static int bt3c_write(unsigned int iobase, int fifo_size, __u8 *buf, int len)
 {
 	int actual = 0;

 	bt3c_address(iobase, 0x7080);

 	/* Fill FIFO with current frame */
 	while (actual < len) {
 		/* Transmit next byte */
 		bt3c_put(iobase, buf[actual]);
 		actual++;
 	}

 	bt3c_io_write(iobase, 0x7005, actual);

 	return actual;
 }


 static void bt3c_write_wakeup(struct bt3c_info *info)
 {
 	if (!info) {
 		BT_ERR("Unknown device");
 		return;
 	}

 	if (test_and_set_bit(XMIT_SENDING, &(info->tx_state)))
 		return;

 	do {
 		unsigned int iobase = info->p_dev->resource[0]->start;
 		register struct sk_buff *skb;
 		int len;

 		if (!pcmcia_dev_present(info->p_dev))
 			break;

 		skb = skb_dequeue(&(info->txq));
 		if (!skb) {
 			clear_bit(XMIT_SENDING, &(info->tx_state));
 			break;
 		}

 		/* Send frame */
 		len = bt3c_write(iobase, 256, skb->data, skb->len);

 		if (len != skb->len)
 			BT_ERR("Very strange");

 		kfree_skb(skb);

 		info->hdev->stat.byte_tx += len;

 	} while (0);
 }


 static void bt3c_receive(struct bt3c_info *info)
 {
 	unsigned int iobase;
 	int size = 0, avail;

 	if (!info) {
 		BT_ERR("Unknown device");
 		return;
 	}

 	iobase = info->p_dev->resource[0]->start;

 	avail = bt3c_read(iobase, 0x7006);

 	bt3c_address(iobase, 0x7480);
 	while (size < avail) {
 		size++;
 		info->hdev->stat.byte_rx++;

 		/* Allocate packet */
 		if (!info->rx_skb) {
 			info->rx_state = RECV_WAIT_PACKET_TYPE;
 			info->rx_count = 0;
 			info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
 			if (!info->rx_skb) {
 				BT_ERR("Can't allocate mem for new packet");
 				return;
 			}
 		}


 		if (info->rx_state == RECV_WAIT_PACKET_TYPE) {

 			hci_skb_pkt_type(info->rx_skb) = inb(iobase + DATA_L);
 			inb(iobase + DATA_H);

 			switch (hci_skb_pkt_type(info->rx_skb)) {

 			case HCI_EVENT_PKT:
 				info->rx_state = RECV_WAIT_EVENT_HEADER;
 				info->rx_count = HCI_EVENT_HDR_SIZE;
 				break;

 			case HCI_ACLDATA_PKT:
 				info->rx_state = RECV_WAIT_ACL_HEADER;
 				info->rx_count = HCI_ACL_HDR_SIZE;
 				break;

 			case HCI_SCODATA_PKT:
 				info->rx_state = RECV_WAIT_SCO_HEADER;
 				info->rx_count = HCI_SCO_HDR_SIZE;
 				break;

 			default:
 				/* Unknown packet */
 				BT_ERR("Unknown HCI packet with type 0x%02x received",
 				       hci_skb_pkt_type(info->rx_skb));
 				info->hdev->stat.err_rx++;

 				kfree_skb(info->rx_skb);
 				info->rx_skb = NULL;
 				break;

 			}

 		} else {

 			__u8 x = inb(iobase + DATA_L);

 			skb_put_u8(info->rx_skb, x);
 			inb(iobase + DATA_H);
 			info->rx_count--;

 			if (info->rx_count == 0) {

 				int dlen;
 				struct hci_event_hdr *eh;
 				struct hci_acl_hdr *ah;
 				struct hci_sco_hdr *sh;

 				switch (info->rx_state) {

 				case RECV_WAIT_EVENT_HEADER:
 					eh = hci_event_hdr(info->rx_skb);
 					info->rx_state = RECV_WAIT_DATA;
 					info->rx_count = eh->plen;
 					break;

 				case RECV_WAIT_ACL_HEADER:
 					ah = hci_acl_hdr(info->rx_skb);
 					dlen = __le16_to_cpu(ah->dlen);
 					info->rx_state = RECV_WAIT_DATA;
 					info->rx_count = dlen;
 					break;

 				case RECV_WAIT_SCO_HEADER:
 					sh = hci_sco_hdr(info->rx_skb);
 					info->rx_state = RECV_WAIT_DATA;
 					info->rx_count = sh->dlen;
 					break;

 				case RECV_WAIT_DATA:
 					hci_recv_frame(info->hdev, info->rx_skb);
 					info->rx_skb = NULL;
 					break;

 				}

 			}

 		}

 	}

 	bt3c_io_write(iobase, 0x7006, 0x0000);
 }


 static irqreturn_t bt3c_interrupt(int irq, void *dev_inst)
 {
 	struct bt3c_info *info = dev_inst;
 	unsigned int iobase;
 	int iir;
 	irqreturn_t r = IRQ_NONE;

 	if (!info || !info->hdev)
 		/* our irq handler is shared */
 		return IRQ_NONE;

 	iobase = info->p_dev->resource[0]->start;

 	spin_lock(&(info->lock));

 	iir = inb(iobase + CONTROL);
 	if (iir & 0x80) {
 		int stat = bt3c_read(iobase, 0x7001);

 		if ((stat & 0xff) == 0x7f) {
 			BT_ERR("Very strange (stat=0x%04x)", stat);
 		} else if ((stat & 0xff) != 0xff) {
 			if (stat & 0x0020) {
 				int status = bt3c_read(iobase, 0x7002) & 0x10;
 				BT_INFO("%s: Antenna %s", info->hdev->name,
 							status ? "out" : "in");
 			}
 			if (stat & 0x0001)
 				bt3c_receive(info);
 			if (stat & 0x0002) {
 				clear_bit(XMIT_SENDING, &(info->tx_state));
 				bt3c_write_wakeup(info);
 			}

 			bt3c_io_write(iobase, 0x7001, 0x0000);

 			outb(iir, iobase + CONTROL);
 		}
 		r = IRQ_HANDLED;
 	}

 	spin_unlock(&(info->lock));

 	return r;
 }


 /* ======================== HCI interface ======================== */


 static int bt3c_hci_flush(struct hci_dev *hdev)
 {
 	struct bt3c_info *info = hci_get_drvdata(hdev);

 	/* Drop TX queue */
 	skb_queue_purge(&(info->txq));

 	return 0;
 }


 static int bt3c_hci_open(struct hci_dev *hdev)
 {
 	return 0;
 }


 static int bt3c_hci_close(struct hci_dev *hdev)
 {
 	bt3c_hci_flush(hdev);

 	return 0;
 }


 static int bt3c_hci_send_frame(struct hci_dev *hdev, struct sk_buff *skb)
 {
 	struct bt3c_info *info = hci_get_drvdata(hdev);
 	unsigned long flags;

 	switch (hci_skb_pkt_type(skb)) {
 	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;
 	}

 	/* Prepend skb with frame type */
 	memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
 	skb_queue_tail(&(info->txq), skb);

 	spin_lock_irqsave(&(info->lock), flags);

 	bt3c_write_wakeup(info);

 	spin_unlock_irqrestore(&(info->lock), flags);

 	return 0;
 }


 /* ======================== Card services HCI interaction ======================== */


 static int bt3c_load_firmware(struct bt3c_info *info,
 			      const unsigned char *firmware,
 			      int count)
 {
 	char *ptr = (char *) firmware;
 	char b[9];
 	unsigned int iobase, tmp;
 	unsigned long size, addr, fcs;
 	int i, err = 0;

 	iobase = info->p_dev->resource[0]->start;

 	/* Reset */
 	bt3c_io_write(iobase, 0x8040, 0x0404);
 	bt3c_io_write(iobase, 0x8040, 0x0400);

 	udelay(1);

 	bt3c_io_write(iobase, 0x8040, 0x0404);

 	udelay(17);

 	/* Load */
 	while (count) {
 		if (ptr[0] != 'S') {
 			BT_ERR("Bad address in firmware");
 			err = -EFAULT;
 			goto error;
 		}

 		memset(b, 0, sizeof(b));
 		memcpy(b, ptr + 2, 2);
 		if (kstrtoul(b, 16, &size) < 0)
 			return -EINVAL;

 		memset(b, 0, sizeof(b));
 		memcpy(b, ptr + 4, 8);
 		if (kstrtoul(b, 16, &addr) < 0)
 			return -EINVAL;

 		memset(b, 0, sizeof(b));
 		memcpy(b, ptr + (size * 2) + 2, 2);
 		if (kstrtoul(b, 16, &fcs) < 0)
 			return -EINVAL;

 		memset(b, 0, sizeof(b));
 		for (tmp = 0, i = 0; i < size; i++) {
 			memcpy(b, ptr + (i * 2) + 2, 2);
 			tmp += simple_strtol(b, NULL, 16);
 		}

 		if (((tmp + fcs) & 0xff) != 0xff) {
 			BT_ERR("Checksum error in firmware");
 			err = -EILSEQ;
 			goto error;
 		}

 		if (ptr[1] == '3') {
 			bt3c_address(iobase, addr);

 			memset(b, 0, sizeof(b));
 			for (i = 0; i < (size - 4) / 2; i++) {
 				memcpy(b, ptr + (i * 4) + 12, 4);
 				tmp = simple_strtoul(b, NULL, 16);
 				bt3c_put(iobase, tmp);
 			}
 		}

 		ptr   += (size * 2) + 6;
 		count -= (size * 2) + 6;
 	}

 	udelay(17);

 	/* Boot */
 	bt3c_address(iobase, 0x3000);
 	outb(inb(iobase + CONTROL) | 0x40, iobase + CONTROL);

 error:
 	udelay(17);

 	/* Clear */
 	bt3c_io_write(iobase, 0x7006, 0x0000);
 	bt3c_io_write(iobase, 0x7005, 0x0000);
 	bt3c_io_write(iobase, 0x7001, 0x0000);

 	return err;
 }


 static int bt3c_open(struct bt3c_info *info)
 {
 	const struct firmware *firmware;
 	struct hci_dev *hdev;
 	int err;

 	spin_lock_init(&(info->lock));

 	skb_queue_head_init(&(info->txq));

 	info->rx_state = RECV_WAIT_PACKET_TYPE;
 	info->rx_count = 0;
 	info->rx_skb = NULL;

 	/* Initialize HCI device */
 	hdev = hci_alloc_dev();
 	if (!hdev) {
 		BT_ERR("Can't allocate HCI device");
 		return -ENOMEM;
 	}

 	info->hdev = hdev;

 	hdev->bus = HCI_PCCARD;
 	hci_set_drvdata(hdev, info);
 	SET_HCIDEV_DEV(hdev, &info->p_dev->dev);

 	hdev->open  = bt3c_hci_open;
 	hdev->close = bt3c_hci_close;
 	hdev->flush = bt3c_hci_flush;
 	hdev->send  = bt3c_hci_send_frame;

 	/* Load firmware */
 	err = request_firmware(&firmware, "BT3CPCC.bin", &info->p_dev->dev);
 	if (err < 0) {
 		BT_ERR("Firmware request failed");
 		goto error;
 	}

 	err = bt3c_load_firmware(info, firmware->data, firmware->size);

 	release_firmware(firmware);

 	if (err < 0) {
 		BT_ERR("Firmware loading failed");
 		goto error;
 	}

 	/* Timeout before it is safe to send the first HCI packet */
 	msleep(1000);

 	/* Register HCI device */
 	err = hci_register_dev(hdev);
 	if (err < 0) {
 		BT_ERR("Can't register HCI device");
 		goto error;
 	}

 	return 0;

 error:
 	info->hdev = NULL;
 	hci_free_dev(hdev);
 	return err;
 }


 static int bt3c_close(struct bt3c_info *info)
 {
 	struct hci_dev *hdev = info->hdev;

 	if (!hdev)
 		return -ENODEV;

 	bt3c_hci_close(hdev);

 	hci_unregister_dev(hdev);
 	hci_free_dev(hdev);

 	return 0;
 }

 static int bt3c_probe(struct pcmcia_device *link)
 {
 	struct bt3c_info *info;

 	/* Create new info device */
 	info = devm_kzalloc(&link->dev, sizeof(*info), GFP_KERNEL);
 	if (!info)
 		return -ENOMEM;

 	info->p_dev = link;
 	link->priv = info;

 	link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_VPP |
 		CONF_AUTO_SET_IO;

 	return bt3c_config(link);
 }


 static void bt3c_detach(struct pcmcia_device *link)
 {
 	bt3c_release(link);
 }

 static int bt3c_check_config(struct pcmcia_device *p_dev, void *priv_data)
 {
 	int *try = priv_data;

 	if (!try)
 		p_dev->io_lines = 16;

 	if ((p_dev->resource[0]->end != 8) || (p_dev->resource[0]->start == 0))
 		return -EINVAL;

 	p_dev->resource[0]->end = 8;
 	p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
 	p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;

 	return pcmcia_request_io(p_dev);
 }

 static int bt3c_check_config_notpicky(struct pcmcia_device *p_dev,
 				      void *priv_data)
 {
 	static unsigned int base[5] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, 0x0 };
 	int j;

 	if (p_dev->io_lines > 3)
 		return -ENODEV;

 	p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
 	p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_8;
 	p_dev->resource[0]->end = 8;

 	for (j = 0; j < 5; j++) {
 		p_dev->resource[0]->start = base[j];
 		p_dev->io_lines = base[j] ? 16 : 3;
 		if (!pcmcia_request_io(p_dev))
 			return 0;
 	}
 	return -ENODEV;
 }

 static int bt3c_config(struct pcmcia_device *link)
 {
 	struct bt3c_info *info = link->priv;
 	int i;
 	unsigned long try;

 	/* First pass: look for a config entry that looks normal.
 	   Two tries: without IO aliases, then with aliases */
 	for (try = 0; try < 2; try++)
 		if (!pcmcia_loop_config(link, bt3c_check_config, (void *) try))
 			goto found_port;

 	/* Second pass: try to find an entry that isn't picky about
 	   its base address, then try to grab any standard serial port
 	   address, and finally try to get any free port. */
 	if (!pcmcia_loop_config(link, bt3c_check_config_notpicky, NULL))
 		goto found_port;

 	BT_ERR("No usable port range found");
 	goto failed;

 found_port:
 	i = pcmcia_request_irq(link, &bt3c_interrupt);
 	if (i != 0)
 		goto failed;

 	i = pcmcia_enable_device(link);
 	if (i != 0)
 		goto failed;

 	if (bt3c_open(info) != 0)
 		goto failed;

 	return 0;

 failed:
 	bt3c_release(link);
 	return -ENODEV;
 }


 static void bt3c_release(struct pcmcia_device *link)
 {
 	struct bt3c_info *info = link->priv;

 	bt3c_close(info);

 	pcmcia_disable_device(link);
 }


 static const struct pcmcia_device_id bt3c_ids[] = {
 	PCMCIA_DEVICE_PROD_ID13("3COM", "Bluetooth PC Card", 0xefce0a31, 0xd4ce9b02),
 	PCMCIA_DEVICE_NULL
 };
 MODULE_DEVICE_TABLE(pcmcia, bt3c_ids);

 static struct pcmcia_driver bt3c_driver = {
 	.owner		= THIS_MODULE,
 	.name		= "bt3c_cs",
 	.probe		= bt3c_probe,
 	.remove		= bt3c_detach,
 	.id_table	= bt3c_ids,
 };
 module_pcmcia_driver(bt3c_driver);
	/*
	*
	* Driver for the 3Com Bluetooth PCMCIA card
	*
	* Copyright (C) 2001-2002 Marcel Holtmann <marcel@holtmann.org>
	* Jose Orlando Pereira <jop@di.uminho.pt>
	*
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License version 2 as
	* published by the Free Software Foundation;
	*
	* Software distributed under the License is distributed on an "AS
	* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
	* implied. See the License for the specific language governing
	* rights and limitations under the License.
	*
	* The initial developer of the original code is David A. Hinds
	* <dahinds@users.sourceforge.net>. Portions created by David A. Hinds
	* are Copyright (C) 1999 David A. Hinds. All Rights Reserved.
	*
	*/

	#include <linux/module.h>

	#include <linux/kernel.h>
	#include <linux/init.h>
	#include <linux/slab.h>
	#include <linux/types.h>
	#include <linux/delay.h>
	#include <linux/errno.h>
	#include <linux/ptrace.h>
	#include <linux/ioport.h>
	#include <linux/spinlock.h>
	#include <linux/moduleparam.h>

	#include <linux/skbuff.h>
	#include <linux/string.h>
	#include <linux/serial.h>
	#include <linux/serial_reg.h>
	#include <linux/bitops.h>
	#include <asm/io.h>

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

	#include <pcmcia/cistpl.h>
	#include <pcmcia/ciscode.h>
	#include <pcmcia/ds.h>
	#include <pcmcia/cisreg.h>

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



	/* ======================== Module parameters ======================== */


	MODULE_AUTHOR("Marcel Holtmann <marcel@holtmann.org>");
	MODULE_DESCRIPTION("Bluetooth driver for the 3Com Bluetooth PCMCIA card");
	MODULE_LICENSE("GPL");
	MODULE_FIRMWARE("BT3CPCC.bin");



	/* ======================== Local structures ======================== */


	struct bt3c_info {
	struct pcmcia_device *p_dev;

	struct hci_dev *hdev;

	spinlock_t lock; /* For serializing operations */

	struct sk_buff_head txq;
	unsigned long tx_state;

	unsigned long rx_state;
	unsigned long rx_count;
	struct sk_buff *rx_skb;
	};


	static int bt3c_config(struct pcmcia_device *link);
	static void bt3c_release(struct pcmcia_device *link);

	static void bt3c_detach(struct pcmcia_device *p_dev);


	/* Transmit states */
	#define XMIT_SENDING 1
	#define XMIT_WAKEUP 2
	#define XMIT_WAITING 8

	/* Receiver states */
	#define RECV_WAIT_PACKET_TYPE 0
	#define RECV_WAIT_EVENT_HEADER 1
	#define RECV_WAIT_ACL_HEADER 2
	#define RECV_WAIT_SCO_HEADER 3
	#define RECV_WAIT_DATA 4



	/* ======================== Special I/O functions ======================== */


	#define DATA_L 0
	#define DATA_H 1
	#define ADDR_L 2
	#define ADDR_H 3
	#define CONTROL 4


	static inline void bt3c_address(unsigned int iobase, unsigned short addr)
	{
	outb(addr & 0xff, iobase + ADDR_L);
	outb((addr >> 8) & 0xff, iobase + ADDR_H);
	}


	static inline void bt3c_put(unsigned int iobase, unsigned short value)
	{
	outb(value & 0xff, iobase + DATA_L);
	outb((value >> 8) & 0xff, iobase + DATA_H);
	}


	static inline void bt3c_io_write(unsigned int iobase, unsigned short addr, unsigned short value)
	{
	bt3c_address(iobase, addr);
	bt3c_put(iobase, value);
	}


	static inline unsigned short bt3c_get(unsigned int iobase)
	{
	unsigned short value = inb(iobase + DATA_L);

	value \|= inb(iobase + DATA_H) << 8;

	return value;
	}


	static inline unsigned short bt3c_read(unsigned int iobase, unsigned short addr)
	{
	bt3c_address(iobase, addr);

	return bt3c_get(iobase);
	}



	/* ======================== Interrupt handling ======================== */


	static int bt3c_write(unsigned int iobase, int fifo_size, __u8 *buf, int len)
	{
	int actual = 0;

	bt3c_address(iobase, 0x7080);

	/* Fill FIFO with current frame */
	while (actual < len) {
	/* Transmit next byte */
	bt3c_put(iobase, buf[actual]);
	actual++;
	}

	bt3c_io_write(iobase, 0x7005, actual);

	return actual;
	}


	static void bt3c_write_wakeup(struct bt3c_info *info)
	{
	if (!info) {
	BT_ERR("Unknown device");
	return;
	}

	if (test_and_set_bit(XMIT_SENDING, &(info->tx_state)))
	return;

	do {
	unsigned int iobase = info->p_dev->resource[0]->start;
	register struct sk_buff *skb;
	int len;

	if (!pcmcia_dev_present(info->p_dev))
	break;

	skb = skb_dequeue(&(info->txq));
	if (!skb) {
	clear_bit(XMIT_SENDING, &(info->tx_state));
	break;
	}

	/* Send frame */
	len = bt3c_write(iobase, 256, skb->data, skb->len);

	if (len != skb->len)
	BT_ERR("Very strange");

	kfree_skb(skb);

	info->hdev->stat.byte_tx += len;

	} while (0);
	}


	static void bt3c_receive(struct bt3c_info *info)
	{
	unsigned int iobase;
	int size = 0, avail;

	if (!info) {
	BT_ERR("Unknown device");
	return;
	}

	iobase = info->p_dev->resource[0]->start;

	avail = bt3c_read(iobase, 0x7006);

	bt3c_address(iobase, 0x7480);
	while (size < avail) {
	size++;
	info->hdev->stat.byte_rx++;

	/* Allocate packet */
	if (!info->rx_skb) {
	info->rx_state = RECV_WAIT_PACKET_TYPE;
	info->rx_count = 0;
	info->rx_skb = bt_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC);
	if (!info->rx_skb) {
	BT_ERR("Can't allocate mem for new packet");
	return;
	}
	}


	if (info->rx_state == RECV_WAIT_PACKET_TYPE) {

	hci_skb_pkt_type(info->rx_skb) = inb(iobase + DATA_L);
	inb(iobase + DATA_H);

	switch (hci_skb_pkt_type(info->rx_skb)) {

	case HCI_EVENT_PKT:
	info->rx_state = RECV_WAIT_EVENT_HEADER;
	info->rx_count = HCI_EVENT_HDR_SIZE;
	break;

	case HCI_ACLDATA_PKT:
	info->rx_state = RECV_WAIT_ACL_HEADER;
	info->rx_count = HCI_ACL_HDR_SIZE;
	break;

	case HCI_SCODATA_PKT:
	info->rx_state = RECV_WAIT_SCO_HEADER;
	info->rx_count = HCI_SCO_HDR_SIZE;
	break;

	default:
	/* Unknown packet */
	BT_ERR("Unknown HCI packet with type 0x%02x received",
	hci_skb_pkt_type(info->rx_skb));
	info->hdev->stat.err_rx++;

	kfree_skb(info->rx_skb);
	info->rx_skb = NULL;
	break;

	}

	} else {

	__u8 x = inb(iobase + DATA_L);

	skb_put_u8(info->rx_skb, x);
	inb(iobase + DATA_H);
	info->rx_count--;

	if (info->rx_count == 0) {

	int dlen;
	struct hci_event_hdr *eh;
	struct hci_acl_hdr *ah;
	struct hci_sco_hdr *sh;

	switch (info->rx_state) {

	case RECV_WAIT_EVENT_HEADER:
	eh = hci_event_hdr(info->rx_skb);
	info->rx_state = RECV_WAIT_DATA;
	info->rx_count = eh->plen;
	break;

	case RECV_WAIT_ACL_HEADER:
	ah = hci_acl_hdr(info->rx_skb);
	dlen = __le16_to_cpu(ah->dlen);
	info->rx_state = RECV_WAIT_DATA;
	info->rx_count = dlen;
	break;

	case RECV_WAIT_SCO_HEADER:
	sh = hci_sco_hdr(info->rx_skb);
	info->rx_state = RECV_WAIT_DATA;
	info->rx_count = sh->dlen;
	break;

	case RECV_WAIT_DATA:
	hci_recv_frame(info->hdev, info->rx_skb);
	info->rx_skb = NULL;
	break;

	}

	}

	}

	}

	bt3c_io_write(iobase, 0x7006, 0x0000);
	}


	static irqreturn_t bt3c_interrupt(int irq, void *dev_inst)
	{
	struct bt3c_info *info = dev_inst;
	unsigned int iobase;
	int iir;
	irqreturn_t r = IRQ_NONE;

	if (!info \|\| !info->hdev)
	/* our irq handler is shared */
	return IRQ_NONE;

	iobase = info->p_dev->resource[0]->start;

	spin_lock(&(info->lock));

	iir = inb(iobase + CONTROL);
	if (iir & 0x80) {
	int stat = bt3c_read(iobase, 0x7001);

	if ((stat & 0xff) == 0x7f) {
	BT_ERR("Very strange (stat=0x%04x)", stat);
	} else if ((stat & 0xff) != 0xff) {
	if (stat & 0x0020) {
	int status = bt3c_read(iobase, 0x7002) & 0x10;
	BT_INFO("%s: Antenna %s", info->hdev->name,
	status ? "out" : "in");
	}
	if (stat & 0x0001)
	bt3c_receive(info);
	if (stat & 0x0002) {
	clear_bit(XMIT_SENDING, &(info->tx_state));
	bt3c_write_wakeup(info);
	}

	bt3c_io_write(iobase, 0x7001, 0x0000);

	outb(iir, iobase + CONTROL);
	}
	r = IRQ_HANDLED;
	}

	spin_unlock(&(info->lock));

	return r;
	}



	/* ======================== HCI interface ======================== */


	static int bt3c_hci_flush(struct hci_dev *hdev)
	{
	struct bt3c_info *info = hci_get_drvdata(hdev);

	/* Drop TX queue */
	skb_queue_purge(&(info->txq));

	return 0;
	}


	static int bt3c_hci_open(struct hci_dev *hdev)
	{
	return 0;
	}


	static int bt3c_hci_close(struct hci_dev *hdev)
	{
	bt3c_hci_flush(hdev);

	return 0;
	}


	static int bt3c_hci_send_frame(struct hci_dev hdev, struct sk_buff skb)
	{
	struct bt3c_info *info = hci_get_drvdata(hdev);
	unsigned long flags;

	switch (hci_skb_pkt_type(skb)) {
	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;
	}

	/* Prepend skb with frame type */
	memcpy(skb_push(skb, 1), &hci_skb_pkt_type(skb), 1);
	skb_queue_tail(&(info->txq), skb);

	spin_lock_irqsave(&(info->lock), flags);

	bt3c_write_wakeup(info);

	spin_unlock_irqrestore(&(info->lock), flags);

	return 0;
	}



	/* ======================== Card services HCI interaction ======================== */


	static int bt3c_load_firmware(struct bt3c_info *info,
	const unsigned char *firmware,
	int count)
	{
	char ptr = (char ) firmware;
	char b[9];
	unsigned int iobase, tmp;
	unsigned long size, addr, fcs;
	int i, err = 0;

	iobase = info->p_dev->resource[0]->start;

	/* Reset */
	bt3c_io_write(iobase, 0x8040, 0x0404);
	bt3c_io_write(iobase, 0x8040, 0x0400);

	udelay(1);

	bt3c_io_write(iobase, 0x8040, 0x0404);

	udelay(17);

	/* Load */
	while (count) {
	if (ptr[0] != 'S') {
	BT_ERR("Bad address in firmware");
	err = -EFAULT;
	goto error;
	}

	memset(b, 0, sizeof(b));
	memcpy(b, ptr + 2, 2);
	if (kstrtoul(b, 16, &size) < 0)
	return -EINVAL;

	memset(b, 0, sizeof(b));
	memcpy(b, ptr + 4, 8);
	if (kstrtoul(b, 16, &addr) < 0)
	return -EINVAL;

	memset(b, 0, sizeof(b));
	memcpy(b, ptr + (size * 2) + 2, 2);
	if (kstrtoul(b, 16, &fcs) < 0)
	return -EINVAL;

	memset(b, 0, sizeof(b));
	for (tmp = 0, i = 0; i < size; i++) {
	memcpy(b, ptr + (i * 2) + 2, 2);
	tmp += simple_strtol(b, NULL, 16);
	}

	if (((tmp + fcs) & 0xff) != 0xff) {
	BT_ERR("Checksum error in firmware");
	err = -EILSEQ;
	goto error;
	}

	if (ptr[1] == '3') {
	bt3c_address(iobase, addr);

	memset(b, 0, sizeof(b));
	for (i = 0; i < (size - 4) / 2; i++) {
	memcpy(b, ptr + (i * 4) + 12, 4);
	tmp = simple_strtoul(b, NULL, 16);
	bt3c_put(iobase, tmp);
	}
	}

	ptr += (size * 2) + 6;
	count -= (size * 2) + 6;
	}

	udelay(17);

	/* Boot */
	bt3c_address(iobase, 0x3000);
	outb(inb(iobase + CONTROL) \| 0x40, iobase + CONTROL);

	error:
	udelay(17);

	/* Clear */
	bt3c_io_write(iobase, 0x7006, 0x0000);
	bt3c_io_write(iobase, 0x7005, 0x0000);
	bt3c_io_write(iobase, 0x7001, 0x0000);

	return err;
	}


	static int bt3c_open(struct bt3c_info *info)
	{
	const struct firmware *firmware;
	struct hci_dev *hdev;
	int err;

	spin_lock_init(&(info->lock));

	skb_queue_head_init(&(info->txq));

	info->rx_state = RECV_WAIT_PACKET_TYPE;
	info->rx_count = 0;
	info->rx_skb = NULL;

	/* Initialize HCI device */
	hdev = hci_alloc_dev();
	if (!hdev) {
	BT_ERR("Can't allocate HCI device");
	return -ENOMEM;
	}

	info->hdev = hdev;

	hdev->bus = HCI_PCCARD;
	hci_set_drvdata(hdev, info);
	SET_HCIDEV_DEV(hdev, &info->p_dev->dev);

	hdev->open = bt3c_hci_open;
	hdev->close = bt3c_hci_close;
	hdev->flush = bt3c_hci_flush;
	hdev->send = bt3c_hci_send_frame;

	/* Load firmware */
	err = request_firmware(&firmware, "BT3CPCC.bin", &info->p_dev->dev);
	if (err < 0) {
	BT_ERR("Firmware request failed");
	goto error;
	}

	err = bt3c_load_firmware(info, firmware->data, firmware->size);

	release_firmware(firmware);

	if (err < 0) {
	BT_ERR("Firmware loading failed");
	goto error;
	}

	/* Timeout before it is safe to send the first HCI packet */
	msleep(1000);

	/* Register HCI device */
	err = hci_register_dev(hdev);
	if (err < 0) {
	BT_ERR("Can't register HCI device");
	goto error;
	}

	return 0;

	error:
	info->hdev = NULL;
	hci_free_dev(hdev);
	return err;
	}


	static int bt3c_close(struct bt3c_info *info)
	{
	struct hci_dev *hdev = info->hdev;

	if (!hdev)
	return -ENODEV;

	bt3c_hci_close(hdev);

	hci_unregister_dev(hdev);
	hci_free_dev(hdev);

	return 0;
	}

	static int bt3c_probe(struct pcmcia_device *link)
	{
	struct bt3c_info *info;

	/* Create new info device */
	info = devm_kzalloc(&link->dev, sizeof(*info), GFP_KERNEL);
	if (!info)
	return -ENOMEM;

	info->p_dev = link;
	link->priv = info;

	link->config_flags \|= CONF_ENABLE_IRQ \| CONF_AUTO_SET_VPP \|
	CONF_AUTO_SET_IO;

	return bt3c_config(link);
	}


	static void bt3c_detach(struct pcmcia_device *link)
	{
	bt3c_release(link);
	}

	static int bt3c_check_config(struct pcmcia_device p_dev, void priv_data)
	{
	int *try = priv_data;

	if (!try)
	p_dev->io_lines = 16;

	if ((p_dev->resource[0]->end != 8) \|\| (p_dev->resource[0]->start == 0))
	return -EINVAL;

	p_dev->resource[0]->end = 8;
	p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
	p_dev->resource[0]->flags \|= IO_DATA_PATH_WIDTH_8;

	return pcmcia_request_io(p_dev);
	}

	static int bt3c_check_config_notpicky(struct pcmcia_device *p_dev,
	void *priv_data)
	{
	static unsigned int base[5] = { 0x3f8, 0x2f8, 0x3e8, 0x2e8, 0x0 };
	int j;

	if (p_dev->io_lines > 3)
	return -ENODEV;

	p_dev->resource[0]->flags &= ~IO_DATA_PATH_WIDTH;
	p_dev->resource[0]->flags \|= IO_DATA_PATH_WIDTH_8;
	p_dev->resource[0]->end = 8;

	for (j = 0; j < 5; j++) {
	p_dev->resource[0]->start = base[j];
	p_dev->io_lines = base[j] ? 16 : 3;
	if (!pcmcia_request_io(p_dev))
	return 0;
	}
	return -ENODEV;
	}

	static int bt3c_config(struct pcmcia_device *link)
	{
	struct bt3c_info *info = link->priv;
	int i;
	unsigned long try;

	/* First pass: look for a config entry that looks normal.
	Two tries: without IO aliases, then with aliases */
	for (try = 0; try < 2; try++)
	if (!pcmcia_loop_config(link, bt3c_check_config, (void *) try))
	goto found_port;

	/* Second pass: try to find an entry that isn't picky about
	its base address, then try to grab any standard serial port
	address, and finally try to get any free port. */
	if (!pcmcia_loop_config(link, bt3c_check_config_notpicky, NULL))
	goto found_port;

	BT_ERR("No usable port range found");
	goto failed;

	found_port:
	i = pcmcia_request_irq(link, &bt3c_interrupt);
	if (i != 0)
	goto failed;

	i = pcmcia_enable_device(link);
	if (i != 0)
	goto failed;

	if (bt3c_open(info) != 0)
	goto failed;

	return 0;

	failed:
	bt3c_release(link);
	return -ENODEV;
	}


	static void bt3c_release(struct pcmcia_device *link)
	{
	struct bt3c_info *info = link->priv;

	bt3c_close(info);

	pcmcia_disable_device(link);
	}


	static const struct pcmcia_device_id bt3c_ids[] = {
	PCMCIA_DEVICE_PROD_ID13("3COM", "Bluetooth PC Card", 0xefce0a31, 0xd4ce9b02),
	PCMCIA_DEVICE_NULL
	};
	MODULE_DEVICE_TABLE(pcmcia, bt3c_ids);

	static struct pcmcia_driver bt3c_driver = {
	.owner = THIS_MODULE,
	.name = "bt3c_cs",
	.probe = bt3c_probe,
	.remove = bt3c_detach,
	.id_table = bt3c_ids,
	};
	module_pcmcia_driver(bt3c_driver);