bt3c_cs.c

Linux下蓝牙驱动

/*
 *
 *  Driver for the 3Com Bluetooth PCMCIA card
 *
 *  Copyright (C) 2001-2002  Marcel Holtmann <[e-mail]>
 *                           Jose Orlando Pereira <[e-mail]>
 *
 *
 *  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
 *  <[e-mail]>.  Portions created by David A. Hinds
 *  are Copyright (C) 1999 David A. Hinds.  All Rights Reserved.
 *
 */

#include <linux/config.h>
#include <linux/module.h>

#define __KERNEL_SYSCALLS__

#include <linux/kernel.h>
#include <linux/kmod.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/delay.h>
#include <linux/timer.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/ptrace.h>
#include <linux/ioport.h>
#include <linux/spinlock.h>

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

#include <pcmcia/version.h>
#include <pcmcia/cs_types.h>
#include <pcmcia/cs.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 ======================== */


/* Bit map of interrupts to choose from */
static u_int irq_mask = 0xffff;
static int irq_list[4] = { -1 };

MODULE_PARM(irq_mask, "i");
MODULE_PARM(irq_list, "1-4i");

MODULE_AUTHOR("Marcel Holtmann <[e-mail]>, Jose Orlando Pereira <[e-mail]>");
MODULE_DESCRIPTION("BlueZ driver for the 3Com Bluetooth PCMCIA card");
MODULE_LICENSE("GPL");



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


typedef struct bt3c_info_t {
	dev_link_t link;
	dev_node_t node;

	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;
} bt3c_info_t;


void bt3c_config(dev_link_t *link);
void bt3c_release(u_long arg);
int bt3c_event(event_t event, int priority, event_callback_args_t *args);

static dev_info_t dev_info = "bt3c_cs";

dev_link_t *bt3c_attach(void);
void bt3c_detach(dev_link_t *);

static dev_link_t *dev_list = NULL;


/* 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


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


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


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


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

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

	return value;
}


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(bt3c_info_t *info, int from)
{
	unsigned long flags;

	if (!info) {
		printk(KERN_WARNING "bt3c_cs: Call of write_wakeup for unknown device.\n");
		return;
	}

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

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

	do {
		register unsigned int iobase = info->link.io.BasePort1;
		register struct sk_buff *skb;
		register int len;

		if (!(info->link.state & DEV_PRESENT))
			break;


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

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

		if (len != skb->len) {
			printk(KERN_WARNING "bt3c_cs: very strange\n");
		}

		kfree_skb(skb);

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

	} while (0);

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


static void bt3c_receive(bt3c_info_t *info)
{
	unsigned int iobase;
	int size = 0, avail;

	if (!info) {
		printk(KERN_WARNING "bt3c_cs: Call of receive for unknown device.\n");
		return;
	}

	iobase = info->link.io.BasePort1;

	avail = bt3c_read(iobase, 0x7006);
	//printk("bt3c_cs: receiving %d bytes\n", avail);

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

		/* Allocate packet */
		if (info->rx_skb == NULL) {
			info->rx_state = RECV_WAIT_PACKET_TYPE;
			info->rx_count = 0;
			if (!(info->rx_skb = bluez_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC))) {
				printk(KERN_WARNING "bt3c_cs: Can't allocate mem for new packet.\n");
				return;
			}
		}


		if (info->rx_state == RECV_WAIT_PACKET_TYPE) {

			info->rx_skb->dev = (void *)&(info->hdev);
			info->rx_skb->pkt_type = inb(iobase + DATA_L);
			inb(iobase + DATA_H);
			//printk("bt3c: PACKET_TYPE=%02x\n", info->rx_skb->pkt_type);

			switch (info->rx_skb->pkt_type) {

			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 */
				printk(KERN_WARNING "bt3c_cs: Unknown HCI packet with type 0x%02x received.\n", info->rx_skb->pkt_type);
				info->hdev.stat.err_rx++;
				clear_bit(HCI_RUNNING, &(info->hdev.flags));

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

			}

		} else {

			__u8 x = inb(iobase + DATA_L);

			*skb_put(info->rx_skb, 1) = x;
			inb(iobase + DATA_H);
			info->rx_count--;

			if (info->rx_count == 0) {

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

				switch (info->rx_state) {

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

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

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

				}

			}

		}

	}

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


void bt3c_interrupt(int irq, void *dev_inst, struct pt_regs *regs)
{
	bt3c_info_t *info = dev_inst;
	unsigned int iobase;
	int iir;

	if (!info) {
		printk(KERN_WARNING "bt3c_cs: Call of irq %d for unknown device.\n", irq);
		return;
	}

	iobase = info->link.io.BasePort1;

	spin_lock(&(info->lock));

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

		if ((stat & 0xff) == 0x7f) {
			printk(KERN_WARNING "bt3c_cs: STRANGE stat=%04x\n", stat);
		} else if ((stat & 0xff) != 0xff) {
			if (stat & 0x0020) {
				int stat = bt3c_read(iobase, 0x7002) & 0x10;
				printk(KERN_WARNING "bt3c_cs: antena %s\n", stat ? "OUT" : "IN");
			}
			if (stat & 0x0001)
				bt3c_receive(info);
			if (stat & 0x0002) {
				//printk("bt3c_cs: ACK %04x\n", stat);
				clear_bit(XMIT_SENDING, &(info->tx_state));
				bt3c_write_wakeup(info, 1);
			}

			bt3c_io_write(iobase, 0x7001, 0x0000);

			outb(iir, iobase + CONTROL);
		}
	}

	spin_unlock(&(info->lock));
}




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


static int bt3c_hci_flush(struct hci_dev *hdev)
{
	bt3c_info_t *info = (bt3c_info_t *)(hdev->driver_data);

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

	return 0;
}


static int bt3c_hci_open(struct hci_dev *hdev)
{
	set_bit(HCI_RUNNING, &(hdev->flags));

	return 0;
}


static int bt3c_hci_close(struct hci_dev *hdev)
{
	if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags)))
		return 0;

	bt3c_hci_flush(hdev);

	return 0;
}


static int bt3c_hci_send_frame(struct sk_buff *skb)
{
	bt3c_info_t *info;
	struct hci_dev *hdev = (struct hci_dev *)(skb->dev);

	if (!hdev) {
		printk(KERN_WARNING "bt3c_cs: Frame for unknown HCI device (hdev=NULL).");
		return -ENODEV;
	}

	info = (bt3c_info_t *) (hdev->driver_data);

	switch (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;
	};

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

	bt3c_write_wakeup(info, 0);

	return 0;
}