/*======================================================================

    A driver for PCMCIA parallel port adapters

    (specifically, for the Quatech SPP-100 EPP card: other cards will
    probably require driver tweaks)
    
    parport_cs.c 1.20 2000/11/02 23:15:05

    The contents of this file are subject to the Mozilla Public
    License Version 1.1 (the "License"); you may not use this file
    except in compliance with the License. You may obtain a copy of
    the License at http://www.mozilla.org/MPL/

    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.

    Alternatively, the contents of this file may be used under the
    terms of the GNU Public License version 2 (the "GPL"), in which
    case the provisions of the GPL are applicable instead of the
    above.  If you wish to allow the use of your version of this file
    only under the terms of the GPL and not to allow others to use
    your version of this file under the MPL, indicate your decision
    by deleting the provisions above and replace them with the notice
    and other provisions required by the GPL.  If you do not delete
    the provisions above, a recipient may use your version of this
    file under either the MPL or the GPL.
    
======================================================================*/

#include <pcmcia/config.h>
#include <pcmcia/k_compat.h>

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/ptrace.h>
#include <linux/malloc.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/ioport.h>

#include <linux/parport.h>
#include <linux/parport_pc.h>

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

#ifdef PCMCIA_DEBUG
static int pc_debug = PCMCIA_DEBUG;
MODULE_PARM(pc_debug, "i");
#define DEBUG(n, args...) if (pc_debug>(n)) printk(KERN_DEBUG args)
static char *version =
"parport_cs.c 1.20 2000/11/02 23:15:05 (David Hinds)";
#else
#define DEBUG(n, args...)
#endif

/*====================================================================*/

/* Parameters that can be set with 'insmod' */

/* Bit map of interrupts to choose from */
static u_int irq_mask = 0xdeb8;
static int irq_list[4] = { -1 };
static int epp_mode = 1;

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

/*====================================================================*/

#define FORCE_EPP_MODE	0x08

typedef struct parport_info_t {
    dev_link_t		link;
    int			ndev;
    dev_node_t		node;
    struct parport	*port;
} parport_info_t;

static dev_link_t *parport_attach(void);
static void parport_detach(dev_link_t *);
static void parport_config(dev_link_t *link);
static void parport_cs_release(u_long arg);
static int parport_event(event_t event, int priority,
			 event_callback_args_t *args);

static dev_info_t dev_info = "parport_cs";
static dev_link_t *dev_list = NULL;

extern struct parport_operations parport_pc_ops;
static struct parport_operations parport_cs_ops;

/*====================================================================*/

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

/*======================================================================

    parport_attach() creates an "instance" of the driver, allocating
    local data structures for one device.  The device is registered
    with Card Services.

======================================================================*/

static dev_link_t *parport_attach(void)
{
    parport_info_t *info;
    dev_link_t *link;
    client_reg_t client_reg;
    int i, ret;
    
    DEBUG(0, "parport_attach()\n");

    /* Create new parport 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 = &parport_cs_release;
    link->release.data = (u_long)link;
    link->io.Attributes1 = IO_DATA_PATH_WIDTH_8;
    link->io.Attributes2 = IO_DATA_PATH_WIDTH_8;
    link->irq.Attributes = IRQ_TYPE_EXCLUSIVE;
    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->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 = &parport_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);
	parport_detach(link);
	return NULL;
    }
    
    return link;
} /* parport_attach */

/*======================================================================

    This deletes a driver "instance".  The device is de-registered
    with Card Services.  If it has been released, all local data
    structures are freed.  Otherwise, the structures will be freed
    when the device is released.

======================================================================*/

static void parport_detach(dev_link_t *link)
{
    dev_link_t **linkp;
    int ret;

    DEBUG(0, "parport_detach(0x%p)\n", link);
    
    /* 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)
	parport_cs_release((u_long)link);
    
    if (link->handle) {
	ret = CardServices(DeregisterClient, link->handle);
	if (ret != CS_SUCCESS)
	    cs_error(link->handle, DeregisterClient, ret);
    }
    
    /* Unlink, free device structure */
    *linkp = link->next;
    kfree(link->priv);
    
} /* parport_detach */

/*======================================================================

    parport_config() is scheduled to run after a CARD_INSERTION event
    is received, to configure the PCMCIA socket, and to make the
    parport device available to the system.

======================================================================*/

#define CS_CHECK(fn, args...) \
while ((last_ret=CardServices(last_fn=(fn), args))!=0) goto cs_failed

#define CFG_CHECK(fn, args...) \
if (CardServices(fn, args) != 0) goto next_entry

static struct { u_int flag; char *name; } mode[] = {
    { PARPORT_MODE_TRISTATE, "PS2" },
    { PARPORT_MODE_EPP, "EPP" },
    { PARPORT_MODE_ECP, "ECP" },
#if (LINUX_VERSION_CODE < VERSION(2,3,6))
    { PARPORT_MODE_PCECPEPP, "ECPEPP" },
    { PARPORT_MODE_PCECPPS2, "ECPPS2" }
#endif
};

void parport_config(dev_link_t *link)
{
    client_handle_t handle = link->handle;
    parport_info_t *info = link->priv;
    tuple_t tuple;
    u_short buf[128];
    cisparse_t parse;
    config_info_t conf;
    cistpl_cftable_entry_t *cfg = &parse.cftable_entry;
    cistpl_cftable_entry_t dflt = { 0 };
    struct parport *p;
    int i, last_ret, last_fn;
    
    DEBUG(0, "parport_config(0x%p)\n", link);
    
    tuple.TupleData = (cisdata_t *)buf;
    tuple.TupleOffset = 0; tuple.TupleDataMax = 255;
    tuple.Attributes = 0;
    tuple.DesiredTuple = CISTPL_CONFIG;
    CS_CHECK(GetFirstTuple, handle, &tuple);
    CS_CHECK(GetTupleData, handle, &tuple);
    CS_CHECK(ParseTuple, handle, &tuple, &parse);
    link->conf.ConfigBase = parse.config.base;
    link->conf.Present = parse.config.rmask[0];
    
    /* Configure card */
    link->state |= DEV_CONFIG;

    /* Not sure if this is right... look up the current Vcc */
    CS_CHECK(GetConfigurationInfo, handle, &conf);
    
    tuple.DesiredTuple = CISTPL_CFTABLE_ENTRY;
    tuple.Attributes = 0;
    CS_CHECK(GetFirstTuple, handle, &tuple);
    while (1) {
	CFG_CHECK(GetTupleData, handle, &tuple);
	CFG_CHECK(ParseTuple, handle, &tuple, &parse);

	if ((cfg->io.nwin > 0) || (dflt.io.nwin > 0)) {
	    cistpl_io_t *io = (cfg->io.nwin) ? &cfg->io : &dflt.io;
	    link->conf.ConfigIndex = cfg->index;
	    if (epp_mode)
		link->conf.ConfigIndex |= FORCE_EPP_MODE;
	    link->io.BasePort1 = io->win[0].base;
	    link->io.NumPorts1 = io->win[0].len;
	    link->io.IOAddrLines = io->flags & CISTPL_IO_LINES_MASK;
	    if (io->nwin == 2) {
		link->io.BasePort2 = io->win[1].base;
		link->io.NumPorts2 = io->win[1].len;
	    }
	    CFG_CHECK(RequestIO, link->handle, &link->io);
	    /* If we've got this far, we're done */
	    break;
	}
	
    next_entry:
	if (cfg->flags & CISTPL_CFTABLE_DEFAULT) dflt = *cfg;
	CS_CHECK(GetNextTuple, handle, &tuple);
    }
    
    CS_CHECK(RequestIRQ, handle, &link->irq);
    CS_CHECK(RequestConfiguration, handle, &link->conf);

    p = parport_pc_probe_port(link->io.BasePort1, link->io.BasePort2,
			      link->irq.AssignedIRQ, PARPORT_DMA_NONE,
			      NULL);
    if (p == NULL) {
	printk(KERN_NOTICE "parport_cs: parport_pc_probe_port() at "
	       "0x%3x, irq %u failed\n", link->io.BasePort1,
	       link->irq.AssignedIRQ);
	goto failed;
    }

#if (LINUX_VERSION_CODE < VERSION(2,3,6))
#if (LINUX_VERSION_CODE >= VERSION(2,2,8))
    p->private_data = kmalloc(sizeof(struct parport_pc_private),
			      GFP_KERNEL);
    ((struct parport_pc_private *)(p->private_data))->ctr = 0x0c;
#endif
    parport_proc_register(p);
    p->flags |= PARPORT_FLAG_COMA;
    parport_pc_write_econtrol(p, 0x00);
    parport_pc_write_control(p, 0x0c);
    parport_pc_write_data(p, 0x00);
#endif

    p->modes |= PARPORT_MODE_PCSPP;
    if (epp_mode)
	p->modes |= PARPORT_MODE_TRISTATE | PARPORT_MODE_EPP;
    info->ndev = 1;
    info->node.major = LP_MAJOR;
    info->node.minor = p->number;
    info->port = p;
    strcpy(info->node.dev_name, p->name);
    link->dev = &info->node;
    printk(KERN_INFO "%s: PC-style PCMCIA at %#x", p->name,
	   link->io.BasePort1);
    if (link->io.NumPorts2)
	printk(" & %#x", link->io.BasePort2);
    printk(", irq %u [SPP", link->irq.AssignedIRQ);
    for (i = 0; i < 5; i++)
	if (p->modes & mode[i].flag) printk(",%s", mode[i].name);
    printk("]\n");
    
    link->state &= ~DEV_CONFIG_PENDING;
    return;
    
cs_failed:
    cs_error(link->handle, last_fn, last_ret);
failed:
    parport_cs_release((u_long)link);

} /* parport_config */

/*======================================================================

    After a card is removed, parport_cs_release() will unregister the
    device, and release the PCMCIA configuration.  If the device is
    still open, this will be postponed until it is closed.
    
======================================================================*/

void parport_cs_release(u_long arg)
{
    dev_link_t *link = (dev_link_t *)arg;
    parport_info_t *info = link->priv;
    
    DEBUG(0, "parport_release(0x%p)\n", link);

    if (info->ndev) {
	struct parport *p = info->port;
#if (LINUX_VERSION_CODE < VERSION(2,3,6))
	if (!(p->flags & PARPORT_FLAG_COMA))
	    parport_quiesce(p);
#endif
	parport_proc_unregister(p);
#if (LINUX_VERSION_CODE >= VERSION(2,2,8))
	kfree(p->private_data);
#endif
	parport_unregister_port(p);
    }
    info->ndev = 0;
    link->dev = NULL;
    
    CardServices(ReleaseConfiguration, link->handle);
    CardServices(ReleaseIO, link->handle, &link->io);
    CardServices(ReleaseIRQ, link->handle, &link->irq);
    
    link->state &= ~DEV_CONFIG;

} /* parport_cs_release */

/*======================================================================

    The card status event handler.  Mostly, this schedules other
    stuff to run after an event is received.
    
======================================================================*/

int parport_event(event_t event, int priority,
		  event_callback_args_t *args)
{
    dev_link_t *link = args->client_data;

    DEBUG(1, "parport_event(0x%06x)\n", event);
    
    switch (event) {
    case CS_EVENT_CARD_REMOVAL:
	link->state &= ~DEV_PRESENT;
	if (link->state & DEV_CONFIG)
	    mod_timer(&link->release, jiffies + HZ/20);
	break;
    case CS_EVENT_CARD_INSERTION:
	link->state |= DEV_PRESENT | DEV_CONFIG_PENDING;
	parport_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;
} /* parport_event */

/*====================================================================*/

#if (LINUX_VERSION_CODE < VERSION(2,3,6))

static void inc_use_count(void)
{
    MOD_INC_USE_COUNT;
    parport_pc_ops.inc_use_count();
}

static void dec_use_count(void)
{
    MOD_DEC_USE_COUNT;
    parport_pc_ops.dec_use_count();
}

#endif

/*====================================================================*/

static int __init init_parport_cs(void)
{
    servinfo_t serv;
    DEBUG(0, "%s\n", version);
    CardServices(GetCardServicesInfo, &serv);
    if (serv.Revision != CS_RELEASE_CODE) {
	printk(KERN_NOTICE "parport_cs: Card Services release "
	       "does not match!\n");
	return -1;
    }

#if (LINUX_VERSION_CODE < VERSION(2,3,6))
    /* This is to protect against unloading modules out of order */
    parport_cs_ops = parport_pc_ops;
    parport_cs_ops.inc_use_count = &inc_use_count;
    parport_cs_ops.dec_use_count = &dec_use_count;
#endif

    register_pccard_driver(&dev_info, &parport_attach, &parport_detach);
    return 0;
}

static void __exit exit_parport_cs(void)
{
    DEBUG(0, "parport_cs: unloading\n");
    unregister_pccard_driver(&dev_info);
    while (dev_list != NULL)
	parport_detach(dev_list);
}

module_init(init_parport_cs);
module_exit(exit_parport_cs);