/*
 *
 *  A driver for Nokia Connectivity Card DTL-1 devices
 *
 *  Copyright (C) 2001-2002  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 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/config.h>
#include <linux/module.h>

#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/errno.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 <marcel@holtmann.org>");
MODULE_DESCRIPTION("BlueZ driver for Nokia Connectivity Card DTL-1");
MODULE_LICENSE("GPL");



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


typedef struct dtl1_info_t {
	dev_link_t link;
	dev_node_t node;

	struct hci_dev hdev;

	spinlock_t lock;		/* For serializing operations */

	unsigned long flowmask;		/* HCI flow mask */
	int ri_latch;

	struct sk_buff_head txq;
	unsigned long tx_state;

	unsigned long rx_state;
	unsigned long rx_count;
	struct sk_buff *rx_skb;
} dtl1_info_t;


void dtl1_config(dev_link_t *link);
void dtl1_release(u_long arg);
int dtl1_event(event_t event, int priority, event_callback_args_t *args);

static dev_info_t dev_info = "dtl1_cs";

dev_link_t *dtl1_attach(void);
void dtl1_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_NSH   0
#define RECV_WAIT_DATA  1


typedef struct {
	u8 type;
	u8 zero;
	u16 len;
} __attribute__ ((packed)) nsh_t;	/* Nokia Specific Header */

#define NSHL  4				/* Nokia Specific Header Length */



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


static int dtl1_write(unsigned int iobase, int fifo_size, __u8 *buf, int len)
{
	int actual = 0;

	/* Tx FIFO should be empty */
	if (!(inb(iobase + UART_LSR) & UART_LSR_THRE))
		return 0;

	/* Fill FIFO with current frame */
	while ((fifo_size-- > 0) && (actual < len)) {
		/* Transmit next byte */
		outb(buf[actual], iobase + UART_TX);
		actual++;
	}

	return actual;
}


static void dtl1_write_wakeup(dtl1_info_t *info)
{
	if (!info) {
		printk(KERN_WARNING "dtl1_cs: Call of write_wakeup for unknown device.\n");
		return;
	}

	if (test_bit(XMIT_WAITING, &(info->tx_state))) {
		set_bit(XMIT_WAKEUP, &(info->tx_state));
		return;
	}

	if (test_and_set_bit(XMIT_SENDING, &(info->tx_state))) {
		set_bit(XMIT_WAKEUP, &(info->tx_state));
		return;
	}

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

		clear_bit(XMIT_WAKEUP, &(info->tx_state));

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

		if (!(skb = skb_dequeue(&(info->txq))))
			break;

		/* Send frame */
		len = dtl1_write(iobase, 32, skb->data, skb->len);

		if (len == skb->len) {
			set_bit(XMIT_WAITING, &(info->tx_state));
			kfree_skb(skb);
		} else {
			skb_pull(skb, len);
			skb_queue_head(&(info->txq), skb);
		}

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

	} while (test_bit(XMIT_WAKEUP, &(info->tx_state)));

	clear_bit(XMIT_SENDING, &(info->tx_state));
}


static void dtl1_control(dtl1_info_t *info, struct sk_buff *skb)
{
	u8 flowmask = *(u8 *)skb->data;
	int i;

	printk(KERN_INFO "dtl1_cs: Nokia control data = ");
	for (i = 0; i < skb->len; i++) {
		printk("%02x ", skb->data[i]);
	}
	printk("\n");

	/* transition to active state */
	if (((info->flowmask & 0x07) == 0) && ((flowmask & 0x07) != 0)) {
		clear_bit(XMIT_WAITING, &(info->tx_state));
		dtl1_write_wakeup(info);
	}

	info->flowmask = flowmask;

	kfree_skb(skb);
}


static void dtl1_receive(dtl1_info_t *info)
{
	unsigned int iobase;
	nsh_t *nsh;
	int boguscount = 0;

	if (!info) {
		printk(KERN_WARNING "dtl1_cs: Call of receive for unknown device.\n");
		return;
	}

	iobase = info->link.io.BasePort1;

	do {
		info->hdev.stat.byte_rx++;

		/* Allocate packet */
		if (info->rx_skb == NULL)
			if (!(info->rx_skb = bluez_skb_alloc(HCI_MAX_FRAME_SIZE, GFP_ATOMIC))) {
				printk(KERN_WARNING "dtl1_cs: Can't allocate mem for new packet.\n");
				info->rx_state = RECV_WAIT_NSH;
				info->rx_count = NSHL;
				return;
			}

		*skb_put(info->rx_skb, 1) = inb(iobase + UART_RX);
		nsh = (nsh_t *)info->rx_skb->data;

		info->rx_count--;

		if (info->rx_count == 0) {

			switch (info->rx_state) {
			case RECV_WAIT_NSH:
				info->rx_state = RECV_WAIT_DATA;
				info->rx_count = nsh->len + (nsh->len & 0x0001);
				break;
			case RECV_WAIT_DATA:
				info->rx_skb->pkt_type = nsh->type;

				/* remove PAD byte if it exists */
				if (nsh->len & 0x0001) {
					info->rx_skb->tail--;
					info->rx_skb->len--;
				}

				/* remove NSH */
				skb_pull(info->rx_skb, NSHL);

				switch (info->rx_skb->pkt_type) {
				case 0x80:
					/* control data for the Nokia Card */
					dtl1_control(info, info->rx_skb);
					break;
				case 0x82:
				case 0x83:
				case 0x84:
					/* send frame to the HCI layer */
					info->rx_skb->dev = (void *)&(info->hdev);
					info->rx_skb->pkt_type &= 0x0f;
					hci_recv_frame(info->rx_skb);
					break;
				default:
					/* unknown packet */
					printk(KERN_WARNING "dtl1_cs: Unknown HCI packet with type 0x%02x received.\n", info->rx_skb->pkt_type);
					kfree_skb(info->rx_skb);
					break;
				}

				info->rx_state = RECV_WAIT_NSH;
				info->rx_count = NSHL;
				info->rx_skb = NULL;
				break;
			}

		}

		/* Make sure we don't stay here to long */
		if (boguscount++ > 32)
			break;

	} while (inb(iobase + UART_LSR) & UART_LSR_DR);
}


void dtl1_interrupt(int irq, void *dev_inst, struct pt_regs *regs)
{
	dtl1_info_t *info = dev_inst;
	unsigned int iobase;
	unsigned char msr;
	int boguscount = 0;
	int iir, lsr;

	if (!info) {
		printk(KERN_WARNING "dtl1_cs: Call of irq %d for unknown device.\n", irq);
		return;
	}

	iobase = info->link.io.BasePort1;

	spin_lock(&(info->lock));

	iir = inb(iobase + UART_IIR) & UART_IIR_ID;
	while (iir) {

		/* Clear interrupt */
		lsr = inb(iobase + UART_LSR);

		switch (iir) {
		case UART_IIR_RLSI:
			printk(KERN_NOTICE "dtl1_cs: RLSI\n");
			break;
		case UART_IIR_RDI:
			/* Receive interrupt */
			dtl1_receive(info);
			break;
		case UART_IIR_THRI:
			if (lsr & UART_LSR_THRE) {
				/* Transmitter ready for data */
				dtl1_write_wakeup(info);
			}
			break;
		default:
			printk(KERN_NOTICE "dtl1_cs: Unhandled IIR=%#x\n", iir);
			break;
		}

		/* Make sure we don't stay here to long */
		if (boguscount++ > 100)
			break;

		iir = inb(iobase + UART_IIR) & UART_IIR_ID;

	}

	msr = inb(iobase + UART_MSR);

	if (info->ri_latch ^ (msr & UART_MSR_RI)) {
		info->ri_latch = msr & UART_MSR_RI;
		clear_bit(XMIT_WAITING, &(info->tx_state));
		dtl1_write_wakeup(info);
	}

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



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


static int dtl1_hci_open(struct hci_dev *hdev)
{
	set_bit(HCI_RUNNING, &(hdev->flags));

	return 0;
}


static int dtl1_hci_flush(struct hci_dev *hdev)
{
	dtl1_info_t *info = (dtl1_info_t *)(hdev->driver_data);

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

	return 0;
}


static int dtl1_hci_close(struct hci_dev *hdev)
{
	if (!test_and_clear_bit(HCI_RUNNING, &(hdev->flags)))
		return 0;

	dtl1_hci_flush(hdev);

	return 0;
}


static int dtl1_hci_send_frame(struct sk_buff *skb)
{
	dtl1_info_t *info;
	struct hci_dev *hdev = (struct hci_dev *)(skb->dev);
	struct sk_buff *s;
	nsh_t nsh;

	if (!hdev) {
		printk(KERN_WARNING "dtl1_cs: Frame for unknown HCI device (hdev=NULL).");
		return -ENODEV;
	}

	info = (dtl1_info_t *)(hdev->driver_data);

	switch (skb->pkt_type) {
	case HCI_COMMAND_PKT:
		hdev->stat.cmd_tx++;
		nsh.type = 0x81;
		break;
	case HCI_ACLDATA_PKT:
		hdev->stat.acl_tx++;
		nsh.type = 0x82;
		break;
	case HCI_SCODATA_PKT:
		hdev->stat.sco_tx++;
		nsh.type = 0x83;
		break;
	};

	nsh.zero = 0;
	nsh.len = skb->len;

	s = bluez_skb_alloc(NSHL + skb->len + 1, GFP_ATOMIC);
	skb_reserve(s, NSHL);
	memcpy(skb_put(s, skb->len), skb->data, skb->len);
	if (skb->len & 0x0001)
		*skb_put(s, 1) = 0;	/* PAD */

	/* Prepend skb with Nokia frame header and queue */
	memcpy(skb_push(s, NSHL), &nsh, NSHL);
	skb_queue_tail(&(info->txq), s);

	dtl1_write_wakeup(info);

	kfree_skb(skb);

	return 0;
}


static void dtl1_hci_destruct(struct hci_dev *hdev)
{
}


static int dtl1_hci_ioctl(struct hci_dev *hdev, unsigned int cmd,  unsigned long arg)
{
	return -ENOIOCTLCMD;
}



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


int dtl1_open(dtl1_info_t *info)
{
	unsigned long flags;
	unsigned int iobase = info->link.io.BasePort1;
	struct hci_dev *hdev;

	spin_lock_init(&(info->lock));

	skb_queue_head_init(&(info->txq));

	info->rx_state = RECV_WAIT_NSH;
	info->rx_count = NSHL;
	info->rx_skb = NULL;

	set_bit(XMIT_WAITING, &(info->tx_state));

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

	/* Reset UART */
	outb(0, iobase + UART_MCR);

	/* Turn off interrupts */
	outb(0, iobase + UART_IER);

	/* Initialize UART */
	outb(UART_LCR_WLEN8, iobase + UART_LCR);	/* Reset DLAB */
	outb((UART_MCR_DTR | UART_MCR_RTS | UART_MCR_OUT2), iobase + UART_MCR);

	info->ri_latch = inb(info->link.io.BasePort1 + UART_MSR) & UART_MSR_RI;

	/* Turn on interrupts */
	outb(UART_IER_RLSI | UART_IER_RDI | UART_IER_THRI, iobase + UART_IER);

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

	/* Timeout before it is safe to send the first HCI packet */
	set_current_state(TASK_INTERRUPTIBLE);
	schedule_timeout(HZ * 2);


	/* Initialize and register HCI device */

	hdev = &(info->hdev);

	hdev->type = HCI_PCCARD;
	hdev->driver_data = info;

	hdev->open = dtl1_hci_open;
	hdev->close = dtl1_hci_close;
	hdev->flush = dtl1_hci_flush;
	hdev->send = dtl1_hci_send_frame;
	hdev->destruct = dtl1_hci_destruct;
	hdev->ioctl = dtl1_hci_ioctl;

	if (hci_register_dev(hdev) < 0) {
		printk(KERN_WARNING "dtl1_cs: Can't register HCI device %s.\n", hdev->name);
		return -ENODEV;
	}

	return 0;
}


int dtl1_close(dtl1_info_t *info)
{
	unsigned long flags;
	unsigned int iobase = info->link.io.BasePort1;
	struct hci_dev *hdev = &(info->hdev);

	dtl1_hci_close(hdev);

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

	/* Reset UART */
	outb(0, iobase + UART_MCR);

	/* Turn off interrupts */
	outb(0, iobase + UART_IER);

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

	if (hci_unregister_dev(hdev) < 0)
		printk(KERN_WARNING "dtl1_cs: Can't unregister HCI device %s.\n", hdev->name);

	return 0;
}



/* ======================== Card services ======================== */


static void cs_error(client_handle_t handle, int func, int ret)
{
	error_info_t err = { func, ret };

	CardServices(ReportError, handle, &err);
}


dev_link_t *dtl1_attach(void)
{
	dtl1_info_t *info;
	client_reg_t client_reg;
	dev_link_t *link;
	int i, ret;

	/* Create new info device */
	info = kmalloc(sizeof(*info), GFP_KERNEL);
	if (!info)
		return NULL;
	memset(info, 0, sizeof(*info));

	link = &info->link;
	link->priv = info;

	link->release.function = &dtl1_release;
	link->release.data = (u_long)link;
	link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
	link->io.NumPorts1 = 8;
	link->irq.Attributes = IRQ_TYPE_EXCLUSIVE | IRQ_HANDLE_PRESENT;
	link->irq.IRQInfo1 = IRQ_INFO2_VALID | IRQ_LEVEL_ID;

	if (irq_list[0] == -1)
		link->irq.IRQInfo2 = irq_mask;
	else
		for (i = 0; i < 4; i++)
			link->irq.IRQInfo2 |= 1 << irq_list[i];

	link->irq.Handler = dtl1_interrupt;
	link->irq.Instance = info;

	link->conf.Attributes = CONF_ENABLE_IRQ;
	link->conf.Vcc = 50;
	link->conf.IntType = INT_MEMORY_AND_IO;

	/* Register with Card Services */
	link->next = dev_list;
	dev_list = link;
	client_reg.dev_info = &dev_info;
	client_reg.Attributes = INFO_IO_CLIENT | INFO_CARD_SHARE;
	client_reg.EventMask =
		CS_EVENT_CARD_INSERTION | CS_EVENT_CARD_REMOVAL |
		CS_EVENT_RESET_PHYSICAL | CS_EVENT_CARD_RESET |
		CS_EVENT_PM_SUSPEND | CS_EVENT_PM_RESUME;
	client_reg.event_handler = &dtl1_event;
	client_reg.Version = 0x0210;
	client_reg.event_callback_args.client_data = link;

	ret = CardServices(RegisterClient, &link->handle, &client_reg);
	if (ret != CS_SUCCESS) {
		cs_error(link->handle, RegisterClient, ret);
		dtl1_detach(link);
		return NULL;
	}

	return link;
}


void dtl1_detach(dev_link_t *link)
{
	dtl1_info_t *info = link->priv;
	dev_link_t **linkp;
	int ret;

	/* Locate device structure */
	for (linkp = &dev_list; *linkp; linkp = &(*linkp)->next)
		if (*linkp == link)
			break;

	if (*linkp == NULL)
		return;

	del_timer(&link->release);
	if (link->state & DEV_CONFIG)
		dtl1_release((u_long)link);

	if (link->handle) {
		ret = CardServices(DeregisterClient, link->handle);
		if (ret != CS_SUCCESS)
			cs_error(link->handle, DeregisterClient, ret);
	}

	/* Unlink device structure, free bits */
	*linkp = link->next;

	kfree(info);
}


static int get_tuple(int fn, client_handle_t handle, tuple_t *tuple, cisparse_t *parse)
{
	int i;

	i = CardServices(fn, handle, tuple);
	if (i != CS_SUCCESS)
		return CS_NO_MORE_ITEMS;

	i = CardServices(GetTupleData, handle, tuple);
	if (i != CS_SUCCESS)
		return i;

	return CardServices(ParseTuple, handle, tuple, parse);
}


#define first_tuple(a, b, c) get_tuple(GetFirstTuple, a, b, c)
#define next_tuple(a, b, c) get_tuple(GetNextTuple, a, b, c)

void dtl1_config(dev_link_t *link)
{
	client_handle_t handle = link->handle;
	dtl1_info_t *info = link->priv;
	tuple_t tuple;
	u_short buf[256];
	cisparse_t parse;
	cistpl_cftable_entry_t *cf = &parse.cftable_entry;
	config_info_t config;
	int i, last_ret, last_fn;

	tuple.TupleData = (cisdata_t *)buf;
	tuple.TupleOffset = 0;
	tuple.TupleDataMax = 255;
	tuple.Attributes = 0;

	/* Get configuration register information */
	tuple.DesiredTuple = CISTPL_CONFIG;
	last_ret = first_tuple(handle, &tuple, &parse);
	if (last_ret != CS_SUCCESS) {
		last_fn = ParseTuple;
		goto cs_failed;
	}
	link->conf.ConfigBase = parse.config.base;
	link->conf.Present = parse.config.rmask[0];

	/* Configure card */
	link->state |= DEV_CONFIG;
	i = CardServices(GetConfigurationInfo, handle, &config);
	link->conf.Vcc = config.Vcc;

	tuple.TupleData = (cisdata_t *)buf;
	tuple.TupleOffset = 0;
	tuple.TupleDataMax = 255;
	tuple.Attributes = 0;
	tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;

	/* Look for a generic full-sized window */
	link->io.NumPorts1 = 8;
	i = first_tuple(handle, &tuple, &parse);
	while (i != CS_NO_MORE_ITEMS) {
		if ((i == CS_SUCCESS) && (cf->io.nwin == 1) && (cf->io.win[0].len > 8)) {
			link->conf.ConfigIndex = cf->index;
			link->io.BasePort1 = cf->io.win[0].base;
			link->io.NumPorts1 = cf->io.win[0].len;	/*yo */
			link->io.IOAddrLines = cf->io.flags & CISTPL_IO_LINES_MASK;
			i = CardServices(RequestIO, link->handle, &link->io);
			if (i == CS_SUCCESS)
				break;
		}
		i = next_tuple(handle, &tuple, &parse);
	}

	if (i != CS_SUCCESS) {
		cs_error(link->handle, RequestIO, i);
		goto failed;
	}

	i = CardServices(RequestIRQ, link->handle, &link->irq);
	if (i != CS_SUCCESS) {
		cs_error(link->handle, RequestIRQ, i);
		link->irq.AssignedIRQ = 0;
	}

	i = CardServices(RequestConfiguration, link->handle, &link->conf);
	if (i != CS_SUCCESS) {
		cs_error(link->handle, RequestConfiguration, i);
		goto failed;
	}

	MOD_INC_USE_COUNT;

	if (dtl1_open(info) != 0)
		goto failed;

	strcpy(info->node.dev_name, info->hdev.name);
	link->dev = &info->node;
	link->state &= ~DEV_CONFIG_PENDING;

	return;

cs_failed:
	cs_error(link->handle, last_fn, last_ret);

failed:
	dtl1_release((u_long)link);
}


void dtl1_release(u_long arg)
{
	dev_link_t *link = (dev_link_t *)arg;
	dtl1_info_t *info = link->priv;

	if (link->state & DEV_PRESENT)
		dtl1_close(info);

	MOD_DEC_USE_COUNT;

	link->dev = NULL;

	CardServices(ReleaseConfiguration, link->handle);
	CardServices(ReleaseIO, link->handle, &link->io);
	CardServices(ReleaseIRQ, link->handle, &link->irq);

	link->state &= ~DEV_CONFIG;
}


int dtl1_event(event_t event, int priority, event_callback_args_t *args)
{
	dev_link_t *link = args->client_data;
	dtl1_info_t *info = link->priv;

	switch (event) {
	case CS_EVENT_CARD_REMOVAL:
		link->state &= ~DEV_PRESENT;
		if (link->state & DEV_CONFIG) {
			dtl1_close(info);
			mod_timer(&link->release, jiffies + HZ / 20);
		}
		break;
	case CS_EVENT_CARD_INSERTION:
		link->state |= DEV_PRESENT | DEV_CONFIG_PENDING;
		dtl1_config(link);
		break;
	case CS_EVENT_PM_SUSPEND:
		link->state |= DEV_SUSPEND;
		/* Fall through... */
	case CS_EVENT_RESET_PHYSICAL:
		if (link->state & DEV_CONFIG)
			CardServices(ReleaseConfiguration, link->handle);
		break;
	case CS_EVENT_PM_RESUME:
		link->state &= ~DEV_SUSPEND;
		/* Fall through... */
	case CS_EVENT_CARD_RESET:
		if (DEV_OK(link))
			CardServices(RequestConfiguration, link->handle, &link->conf);
		break;
	}

	return 0;
}



/* ======================== Module initialization ======================== */


int __init init_dtl1_cs(void)
{
	servinfo_t serv;
	int err;

	CardServices(GetCardServicesInfo, &serv);
	if (serv.Revision != CS_RELEASE_CODE) {
		printk(KERN_NOTICE "dtl1_cs: Card Services release does not match!\n");
		return -1;
	}

	err = register_pccard_driver(&dev_info, &dtl1_attach, &dtl1_detach);

	return err;
}


void __exit exit_dtl1_cs(void)
{
	unregister_pccard_driver(&dev_info);

	while (dev_list != NULL)
		dtl1_detach(dev_list);
}


module_init(init_dtl1_cs);
module_exit(exit_dtl1_cs);
