/* $Id: teles_cs.c,v 1.1.2.2 2004/01/25 15:07:06 keil Exp $ */
/*======================================================================

    A teles S0 PCMCIA client driver

    Based on skeleton by David Hinds, dhinds@allegro.stanford.edu
    Written by Christof Petig, christof.petig@wtal.de
    
    Also inspired by ELSA PCMCIA driver 
    by Klaus Lichtenwalder <Lichtenwalder@ACM.org>
    
    Extentions to new hisax_pcmcia by Karsten Keil

    minor changes to be compatible with kernel 2.4.x
    by Jan.Schubert@GMX.li

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

#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/ptrace.h>
#include <linux/slab.h>
#include <linux/string.h>
#include <linux/timer.h>
#include <linux/ioport.h>
#include <asm/io.h>
#include <asm/system.h>

#include <pcmcia/cistpl.h>
#include <pcmcia/cisreg.h>
#include <pcmcia/ds.h>
#include "hisax_cfg.h"

MODULE_DESCRIPTION("ISDN4Linux: PCMCIA client driver for Teles PCMCIA cards");
MODULE_AUTHOR("Christof Petig, christof.petig@wtal.de, Karsten Keil, kkeil@suse.de");
MODULE_LICENSE("GPL");


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

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

static int protocol = 2;        /* EURO-ISDN Default */
module_param(protocol, int, 0);

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

/*
   The event() function is this driver's Card Services event handler.
   It will be called by Card Services when an appropriate card status
   event is received.  The config() and release() entry points are
   used to configure or release a socket, in response to card insertion
   and ejection events.  They are invoked from the teles_cs event
   handler.
*/

static int teles_cs_config(struct pcmcia_device *link) __devinit ;
static void teles_cs_release(struct pcmcia_device *link);

/*
   The attach() and detach() entry points are used to create and destroy
   "instances" of the driver, where each instance represents everything
   needed to manage one actual PCMCIA card.
*/

static void teles_detach(struct pcmcia_device *p_dev) __devexit ;

typedef struct local_info_t {
	struct pcmcia_device	*p_dev;
    int                 busy;
    int			cardnr;
} local_info_t;

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

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

    The dev_link structure is initialized, but we don't actually
    configure the card at this point -- we wait until we receive a
    card insertion event.

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

static int __devinit teles_probe(struct pcmcia_device *link)
{
    local_info_t *local;

    dev_dbg(&link->dev, "teles_attach()\n");

    /* Allocate space for private device-specific data */
    local = kzalloc(sizeof(local_info_t), GFP_KERNEL);
    if (!local) return -ENOMEM;
    local->cardnr = -1;

    local->p_dev = link;
    link->priv = local;

    /*
      General socket configuration defaults can go here.  In this
      client, we assume very little, and rely on the CIS for almost
      everything.  In most clients, many details (i.e., number, sizes,
      and attributes of IO windows) are fixed by the nature of the
      device, and can be hard-wired here.
    */
    link->config_flags |= CONF_ENABLE_IRQ | CONF_AUTO_SET_IO;

    return teles_cs_config(link);
} /* teles_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 __devexit teles_detach(struct pcmcia_device *link)
{
	local_info_t *info = link->priv;

	dev_dbg(&link->dev, "teles_detach(0x%p)\n", link);

	info->busy = 1;
	teles_cs_release(link);

	kfree(info);
} /* teles_detach */

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

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

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

static int teles_cs_configcheck(struct pcmcia_device *p_dev, void *priv_data)
{
	int j;

	p_dev->io_lines = 5;
	p_dev->resource[0]->end = 96;
	p_dev->resource[0]->flags &= IO_DATA_PATH_WIDTH;
	p_dev->resource[0]->flags |= IO_DATA_PATH_WIDTH_AUTO;

	if ((p_dev->resource[0]->end) && p_dev->resource[0]->start) {
		printk(KERN_INFO "(teles_cs: looks like the 96 model)\n");
		if (!pcmcia_request_io(p_dev))
			return 0;
	} else {
		printk(KERN_INFO "(teles_cs: looks like the 97 model)\n");
		for (j = 0x2f0; j > 0x100; j -= 0x10) {
			p_dev->resource[0]->start = j;
			if (!pcmcia_request_io(p_dev))
				return 0;
		}
	}
	return -ENODEV;
}

static int __devinit teles_cs_config(struct pcmcia_device *link)
{
    local_info_t *dev;
    int i;
    IsdnCard_t icard;

    dev_dbg(&link->dev, "teles_config(0x%p)\n", link);
    dev = link->priv;

    i = pcmcia_loop_config(link, teles_cs_configcheck, NULL);
    if (i != 0)
	goto cs_failed;

    if (!link->irq)
        goto cs_failed;

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

    /* Finally, report what we've done */
    dev_info(&link->dev, "index 0x%02x:",
	    link->config_index);
    printk(", irq %d", link->irq);
    if (link->resource[0])
	printk(" & %pR", link->resource[0]);
    if (link->resource[1])
	printk(" & %pR", link->resource[1]);
    printk("\n");

    icard.para[0] = link->irq;
    icard.para[1] = link->resource[0]->start;
    icard.protocol = protocol;
    icard.typ = ISDN_CTYPE_TELESPCMCIA;
    
    i = hisax_init_pcmcia(link, &(((local_info_t*)link->priv)->busy), &icard);
    if (i < 0) {
    	printk(KERN_ERR "teles_cs: failed to initialize Teles PCMCIA %d at i/o %#x\n",
			i, (unsigned int) link->resource[0]->start);
    	teles_cs_release(link);
	return -ENODEV;
    }

    ((local_info_t*)link->priv)->cardnr = i;
    return 0;

cs_failed:
    teles_cs_release(link);
    return -ENODEV;
} /* teles_cs_config */

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

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

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

static void teles_cs_release(struct pcmcia_device *link)
{
    local_info_t *local = link->priv;

    dev_dbg(&link->dev, "teles_cs_release(0x%p)\n", link);

    if (local) {
    	if (local->cardnr >= 0) {
    	    /* no unregister function with hisax */
	    HiSax_closecard(local->cardnr);
	}
    }

    pcmcia_disable_device(link);
} /* teles_cs_release */

static int teles_suspend(struct pcmcia_device *link)
{
	local_info_t *dev = link->priv;

        dev->busy = 1;

	return 0;
}

static int teles_resume(struct pcmcia_device *link)
{
	local_info_t *dev = link->priv;

        dev->busy = 0;

	return 0;
}


static struct pcmcia_device_id teles_ids[] = {
	PCMCIA_DEVICE_PROD_ID12("TELES", "S0/PC", 0x67b50eae, 0xe9e70119),
	PCMCIA_DEVICE_NULL,
};
MODULE_DEVICE_TABLE(pcmcia, teles_ids);

static struct pcmcia_driver teles_cs_driver = {
	.owner		= THIS_MODULE,
	.drv		= {
		.name	= "teles_cs",
	},
	.probe		= teles_probe,
	.remove		= __devexit_p(teles_detach),
	.id_table       = teles_ids,
	.suspend	= teles_suspend,
	.resume		= teles_resume,
};

static int __init init_teles_cs(void)
{
	return pcmcia_register_driver(&teles_cs_driver);
}

static void __exit exit_teles_cs(void)
{
	pcmcia_unregister_driver(&teles_cs_driver);
}

module_init(init_teles_cs);
module_exit(exit_teles_cs);