/*
 * sound/oss/sb_card.c
 *
 * Detection routine for the ISA Sound Blaster and compatible sound
 * cards.
 *
 * This file is distributed under the GNU GENERAL PUBLIC LICENSE (GPL)
 * Version 2 (June 1991). See the "COPYING" file distributed with this
 * software for more info.
 *
 * This is a complete rewrite of the detection routines. This was
 * prompted by the PnP API change during v2.5 and the ugly state the
 * code was in.
 *
 * Copyright (C) by Paul Laufer 2002. Based on code originally by
 * Hannu Savolainen which was modified by many others over the
 * years. Authors specifically mentioned in the previous version were:
 * Daniel Stone, Alessandro Zummo, Jeff Garzik, Arnaldo Carvalho de
 * Melo, Daniel Church, and myself.
 *
 * 02-05-2003 Original Release, Paul Laufer <paul@laufernet.com>
 * 02-07-2003 Bug made it into first release. Take two.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/slab.h>
#include <linux/init.h>
#include "sound_config.h"
#include "sb_mixer.h"
#include "sb.h"
#ifdef CONFIG_PNP
#include <linux/pnp.h>
#endif /* CONFIG_PNP */
#include "sb_card.h"

MODULE_DESCRIPTION("OSS Soundblaster ISA PnP and legacy sound driver");
MODULE_LICENSE("GPL");

extern void *smw_free;

static int __initdata mpu_io    = 0;
static int __initdata io        = -1;
static int __initdata irq       = -1;
static int __initdata dma       = -1;
static int __initdata dma16     = -1;
static int __initdata type      = 0; /* Can set this to a specific card type */
static int __initdata esstype   = 0; /* ESS chip type */
static int __initdata acer      = 0; /* Do acer notebook init? */
static int __initdata sm_games  = 0; /* Logitech soundman games? */

static struct sb_card_config *legacy = NULL;

#ifdef CONFIG_PNP
static int pnp_registered;
static int __initdata pnp       = 1;
/*
static int __initdata uart401   = 0;
*/
#else
static int __initdata pnp       = 0;
#endif

module_param(io, int, 000);
MODULE_PARM_DESC(io,       "Soundblaster i/o base address (0x220,0x240,0x260,0x280)");
module_param(irq, int, 000);
MODULE_PARM_DESC(irq,      "IRQ (5,7,9,10)");
module_param(dma, int, 000);
MODULE_PARM_DESC(dma,      "8-bit DMA channel (0,1,3)");
module_param(dma16, int, 000);
MODULE_PARM_DESC(dma16,    "16-bit DMA channel (5,6,7)");
module_param(mpu_io, int, 000);
MODULE_PARM_DESC(mpu_io,   "MPU base address");
module_param(type, int, 000);
MODULE_PARM_DESC(type,     "You can set this to specific card type (doesn't " \
                 "work with pnp)");
module_param(sm_games, int, 000);
MODULE_PARM_DESC(sm_games, "Enable support for Logitech soundman games " \
                 "(doesn't work with pnp)");
module_param(esstype, int, 000);
MODULE_PARM_DESC(esstype,  "ESS chip type (doesn't work with pnp)");
module_param(acer, int, 000);
MODULE_PARM_DESC(acer,     "Set this to detect cards in some ACER notebooks "\
                 "(doesn't work with pnp)");

#ifdef CONFIG_PNP
module_param(pnp, int, 000);
MODULE_PARM_DESC(pnp,     "Went set to 0 will disable detection using PnP. "\
                  "Default is 1.\n");
/* Not done yet.... */
/*
module_param(uart401, int, 000);
MODULE_PARM_DESC(uart401,  "When set to 1, will attempt to detect and enable"\
                 "the mpu on some clones");
*/
#endif /* CONFIG_PNP */

/* OSS subsystem card registration shared by PnP and legacy routines */
static int sb_register_oss(struct sb_card_config *scc, struct sb_module_options *sbmo)
{
        if (!request_region(scc->conf.io_base, 16, "soundblaster")) {
                printk(KERN_ERR "sb: ports busy.\n");
                kfree(scc);
                return -EBUSY;
        }

        if (!sb_dsp_detect(&scc->conf, 0, 0, sbmo)) {
                release_region(scc->conf.io_base, 16);
                printk(KERN_ERR "sb: Failed DSP Detect.\n");
                kfree(scc);
                return -ENODEV;
        }
        if(!sb_dsp_init(&scc->conf, THIS_MODULE)) {
                printk(KERN_ERR "sb: Failed DSP init.\n");
                kfree(scc);
                return -ENODEV;
        }
        if(scc->mpucnf.io_base > 0) {
                scc->mpu = 1;
                printk(KERN_INFO "sb: Turning on MPU\n");
                if(!probe_sbmpu(&scc->mpucnf, THIS_MODULE))
                        scc->mpu = 0;
        }

        return 1;
}

static void sb_unload(struct sb_card_config *scc)
{
        sb_dsp_unload(&scc->conf, 0);
        if(scc->mpu)
                unload_sbmpu(&scc->mpucnf);
        kfree(scc);
}

/* Register legacy card with OSS subsystem */
static int __init sb_init_legacy(void)
{
        struct sb_module_options sbmo = {0};

        if((legacy = kzalloc(sizeof(struct sb_card_config), GFP_KERNEL)) == NULL) {
                printk(KERN_ERR "sb: Error: Could not allocate memory\n");
                return -ENOMEM;
        }

        legacy->conf.io_base      = io;
        legacy->conf.irq          = irq;
        legacy->conf.dma          = dma;
        legacy->conf.dma2         = dma16;
        legacy->conf.card_subtype = type;

        legacy->mpucnf.io_base = mpu_io;
        legacy->mpucnf.irq     = -1;
        legacy->mpucnf.dma     = -1;
        legacy->mpucnf.dma2    = -1;

        sbmo.esstype  = esstype;
        sbmo.sm_games = sm_games;
        sbmo.acer     = acer;

        return sb_register_oss(legacy, &sbmo);
}

#ifdef CONFIG_PNP

/* Populate the OSS subsystem structures with information from PnP */
static void sb_dev2cfg(struct pnp_dev *dev, struct sb_card_config *scc)
{
        scc->conf.io_base   = -1;
        scc->conf.irq       = -1;
        scc->conf.dma       = -1;
        scc->conf.dma2      = -1;
        scc->mpucnf.io_base = -1;
        scc->mpucnf.irq     = -1;
        scc->mpucnf.dma     = -1;
        scc->mpucnf.dma2    = -1;

        /* All clones layout their PnP tables differently and some use
           different logical devices for the MPU */
        if(!strncmp("CTL",scc->card_id,3)) {
                scc->conf.io_base   = pnp_port_start(dev,0);
                scc->conf.irq       = pnp_irq(dev,0);
                scc->conf.dma       = pnp_dma(dev,0);
                scc->conf.dma2      = pnp_dma(dev,1);
                scc->mpucnf.io_base = pnp_port_start(dev,1);
                return;
        }
        if(!strncmp("tBA",scc->card_id,3)) {
                scc->conf.io_base   = pnp_port_start(dev,0);
                scc->conf.irq       = pnp_irq(dev,0);
                scc->conf.dma       = pnp_dma(dev,0);
                scc->conf.dma2      = pnp_dma(dev,1);
                return;
        }
        if(!strncmp("ESS",scc->card_id,3)) {
                scc->conf.io_base   = pnp_port_start(dev,0);
                scc->conf.irq       = pnp_irq(dev,0);
                scc->conf.dma       = pnp_dma(dev,0);
                scc->conf.dma2      = pnp_dma(dev,1);
                scc->mpucnf.io_base = pnp_port_start(dev,2);
                return;
        }
        if(!strncmp("CMI",scc->card_id,3)) {
                scc->conf.io_base = pnp_port_start(dev,0);
                scc->conf.irq     = pnp_irq(dev,0);
                scc->conf.dma     = pnp_dma(dev,0);
                scc->conf.dma2    = pnp_dma(dev,1);
                return;
        }
        if(!strncmp("RWB",scc->card_id,3)) {
                scc->conf.io_base = pnp_port_start(dev,0);
                scc->conf.irq     = pnp_irq(dev,0);
                scc->conf.dma     = pnp_dma(dev,0);
                return;
        }
        if(!strncmp("ALS",scc->card_id,3)) {
                if(!strncmp("ALS0007",scc->card_id,7)) {
                        scc->conf.io_base = pnp_port_start(dev,0);
                        scc->conf.irq     = pnp_irq(dev,0);
                        scc->conf.dma     = pnp_dma(dev,0);
                } else {
                        scc->conf.io_base = pnp_port_start(dev,0);
                        scc->conf.irq     = pnp_irq(dev,0);
                        scc->conf.dma     = pnp_dma(dev,1);
                        scc->conf.dma2    = pnp_dma(dev,0);
                }
                return;
        }
        if(!strncmp("RTL",scc->card_id,3)) {
                scc->conf.io_base = pnp_port_start(dev,0);
                scc->conf.irq     = pnp_irq(dev,0);
                scc->conf.dma     = pnp_dma(dev,1);
                scc->conf.dma2    = pnp_dma(dev,0);
        }
}

static unsigned int sb_pnp_devices;

/* Probe callback function for the PnP API */
static int sb_pnp_probe(struct pnp_card_link *card, const struct pnp_card_device_id *card_id)
{
        struct sb_card_config *scc;
        struct sb_module_options sbmo = {0}; /* Default to 0 for PnP */
        struct pnp_dev *dev = pnp_request_card_device(card, card_id->devs[0].id, NULL);
        
        if(!dev){
                return -EBUSY;
        }

        if((scc = kzalloc(sizeof(struct sb_card_config), GFP_KERNEL)) == NULL) {
                printk(KERN_ERR "sb: Error: Could not allocate memory\n");
                return -ENOMEM;
        }

        printk(KERN_INFO "sb: PnP: Found Card Named = \"%s\", Card PnP id = " \
               "%s, Device PnP id = %s\n", card->card->name, card_id->id,
               dev->id->id);

        scc->card_id = card_id->id;
        scc->dev_id = dev->id->id;
        sb_dev2cfg(dev, scc);

        printk(KERN_INFO "sb: PnP:      Detected at: io=0x%x, irq=%d, " \
               "dma=%d, dma16=%d\n", scc->conf.io_base, scc->conf.irq,
               scc->conf.dma, scc->conf.dma2);

        pnp_set_card_drvdata(card, scc);
        sb_pnp_devices++;

        return sb_register_oss(scc, &sbmo);
}

static void sb_pnp_remove(struct pnp_card_link *card)
{
        struct sb_card_config *scc = pnp_get_card_drvdata(card);

        if(!scc)
                return;

        printk(KERN_INFO "sb: PnP: Removing %s\n", scc->card_id);

        sb_unload(scc);
}

static struct pnp_card_driver sb_pnp_driver = {
        .name          = "OSS SndBlstr", /* 16 character limit */
        .id_table      = sb_pnp_card_table,
        .probe         = sb_pnp_probe,
        .remove        = sb_pnp_remove,
};
MODULE_DEVICE_TABLE(pnp_card, sb_pnp_card_table);
#endif /* CONFIG_PNP */

static void sb_unregister_all(void)
{
#ifdef CONFIG_PNP
        if (pnp_registered)
                pnp_unregister_card_driver(&sb_pnp_driver);
#endif
}

static int __init sb_init(void)
{
        int lres = 0;
        int pres = 0;

        printk(KERN_INFO "sb: Init: Starting Probe...\n");

        if(io != -1 && irq != -1 && dma != -1) {
                printk(KERN_INFO "sb: Probing legacy card with io=%x, "\
                       "irq=%d, dma=%d, dma16=%d\n",io, irq, dma, dma16);
                lres = sb_init_legacy();
        } else if((io != -1 || irq != -1 || dma != -1) ||
                  (!pnp && (io == -1 && irq == -1 && dma == -1)))
                printk(KERN_ERR "sb: Error: At least io, irq, and dma "\
                       "must be set for legacy cards.\n");

#ifdef CONFIG_PNP
        if(pnp) {
                int err = pnp_register_card_driver(&sb_pnp_driver);
                if (!err)
                        pnp_registered = 1;
                pres = sb_pnp_devices;
        }
#endif
        printk(KERN_INFO "sb: Init: Done\n");

        /* If either PnP or Legacy registered a card then return
         * success */
        if (pres == 0 && lres <= 0) {
                sb_unregister_all();
                return -ENODEV;
        }
        return 0;
}

static void __exit sb_exit(void)
{
        printk(KERN_INFO "sb: Unloading...\n");

        /* Unload legacy card */
        if (legacy) {
                printk (KERN_INFO "sb: Unloading legacy card\n");
                sb_unload(legacy);
        }

        sb_unregister_all();

        vfree(smw_free);
        smw_free = NULL;
}

module_init(sb_init);
module_exit(sb_exit);