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root/sound/isa/sb/sb_common.c

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DEFINITIONS

This source file includes following definitions.
  1. snd_sbdsp_command
  2. snd_sbdsp_get_byte
  3. snd_sbdsp_reset
  4. snd_sbdsp_version
  5. snd_sbdsp_probe
  6. snd_sbdsp_free
  7. snd_sbdsp_dev_free
  8. snd_sbdsp_create
  9. alsa_sb_common_init
  10. alsa_sb_common_exit

/*
 *  Copyright (c) by Jaroslav Kysela <perex@perex.cz>
 *                   Uros Bizjak <uros@kss-loka.si>
 *
 *  Lowlevel routines for control of Sound Blaster cards
 *
 *   This program is free software; you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *   GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program; if not, write to the Free Software
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 */

#include <linux/delay.h>
#include <linux/init.h>
#include <linux/interrupt.h>
#include <linux/slab.h>
#include <linux/ioport.h>
#include <sound/core.h>
#include <sound/sb.h>
#include <sound/initval.h>

#include <asm/io.h>
#include <asm/dma.h>

MODULE_AUTHOR("Jaroslav Kysela <perex@perex.cz>");
MODULE_DESCRIPTION("ALSA lowlevel driver for Sound Blaster cards");
MODULE_LICENSE("GPL");

#define BUSY_LOOPS 100000

#undef IO_DEBUG

int snd_sbdsp_command(struct snd_sb *chip, unsigned char val)
{
        int i;
#ifdef IO_DEBUG
        snd_printk(KERN_DEBUG "command 0x%x\n", val);
#endif
        for (i = BUSY_LOOPS; i; i--)
                if ((inb(SBP(chip, STATUS)) & 0x80) == 0) {
                        outb(val, SBP(chip, COMMAND));
                        return 1;
                }
        snd_printd("%s [0x%lx]: timeout (0x%x)\n", __func__, chip->port, val);
        return 0;
}

int snd_sbdsp_get_byte(struct snd_sb *chip)
{
        int val;
        int i;
        for (i = BUSY_LOOPS; i; i--) {
                if (inb(SBP(chip, DATA_AVAIL)) & 0x80) {
                        val = inb(SBP(chip, READ));
#ifdef IO_DEBUG
                        snd_printk(KERN_DEBUG "get_byte 0x%x\n", val);
#endif
                        return val;
                }
        }
        snd_printd("%s [0x%lx]: timeout\n", __func__, chip->port);
        return -ENODEV;
}

int snd_sbdsp_reset(struct snd_sb *chip)
{
        int i;

        outb(1, SBP(chip, RESET));
        udelay(10);
        outb(0, SBP(chip, RESET));
        udelay(30);
        for (i = BUSY_LOOPS; i; i--)
                if (inb(SBP(chip, DATA_AVAIL)) & 0x80) {
                        if (inb(SBP(chip, READ)) == 0xaa)
                                return 0;
                        else
                                break;
                }
        snd_printdd("%s [0x%lx] failed...\n", __func__, chip->port);
        return -ENODEV;
}

static int snd_sbdsp_version(struct snd_sb * chip)
{
        unsigned int result = -ENODEV;

        snd_sbdsp_command(chip, SB_DSP_GET_VERSION);
        result = (short) snd_sbdsp_get_byte(chip) << 8;
        result |= (short) snd_sbdsp_get_byte(chip);
        return result;
}

static int snd_sbdsp_probe(struct snd_sb * chip)
{
        int version;
        int major, minor;
        char *str;
        unsigned long flags;

        /*
         *  initialization sequence
         */

        spin_lock_irqsave(&chip->reg_lock, flags);
        if (snd_sbdsp_reset(chip) < 0) {
                spin_unlock_irqrestore(&chip->reg_lock, flags);
                return -ENODEV;
        }
        version = snd_sbdsp_version(chip);
        if (version < 0) {
                spin_unlock_irqrestore(&chip->reg_lock, flags);
                return -ENODEV;
        }
        spin_unlock_irqrestore(&chip->reg_lock, flags);
        major = version >> 8;
        minor = version & 0xff;
        snd_printdd("SB [0x%lx]: DSP chip found, version = %i.%i\n",
                    chip->port, major, minor);

        switch (chip->hardware) {
        case SB_HW_AUTO:
                switch (major) {
                case 1:
                        chip->hardware = SB_HW_10;
                        str = "1.0";
                        break;
                case 2:
                        if (minor) {
                                chip->hardware = SB_HW_201;
                                str = "2.01+";
                        } else {
                                chip->hardware = SB_HW_20;
                                str = "2.0";
                        }
                        break;
                case 3:
                        chip->hardware = SB_HW_PRO;
                        str = "Pro";
                        break;
                case 4:
                        chip->hardware = SB_HW_16;
                        str = "16";
                        break;
                default:
                        snd_printk(KERN_INFO "SB [0x%lx]: unknown DSP chip version %i.%i\n",
                                   chip->port, major, minor);
                        return -ENODEV;
                }
                break;
        case SB_HW_ALS100:
                str = "16 (ALS-100)";
                break;
        case SB_HW_ALS4000:
                str = "16 (ALS-4000)";
                break;
        case SB_HW_DT019X:
                str = "(DT019X/ALS007)";
                break;
        case SB_HW_CS5530:
                str = "16 (CS5530)";
                break;
        default:
                return -ENODEV;
        }
        sprintf(chip->name, "Sound Blaster %s", str);
        chip->version = (major << 8) | minor;
        return 0;
}

static int snd_sbdsp_free(struct snd_sb *chip)
{
        if (chip->res_port)
                release_and_free_resource(chip->res_port);
        if (chip->irq >= 0)
                free_irq(chip->irq, (void *) chip);
#ifdef CONFIG_ISA
        if (chip->dma8 >= 0) {
                disable_dma(chip->dma8);
                free_dma(chip->dma8);
        }
        if (chip->dma16 >= 0 && chip->dma16 != chip->dma8) {
                disable_dma(chip->dma16);
                free_dma(chip->dma16);
        }
#endif
        kfree(chip);
        return 0;
}

static int snd_sbdsp_dev_free(struct snd_device *device)
{
        struct snd_sb *chip = device->device_data;
        return snd_sbdsp_free(chip);
}

int snd_sbdsp_create(struct snd_card *card,
                     unsigned long port,
                     int irq,
                     irq_handler_t irq_handler,
                     int dma8,
                     int dma16,
                     unsigned short hardware,
                     struct snd_sb **r_chip)
{
        struct snd_sb *chip;
        int err;
        static struct snd_device_ops ops = {
                .dev_free =     snd_sbdsp_dev_free,
        };

        if (snd_BUG_ON(!r_chip))
                return -EINVAL;
        *r_chip = NULL;
        chip = kzalloc(sizeof(*chip), GFP_KERNEL);
        if (chip == NULL)
                return -ENOMEM;
        spin_lock_init(&chip->reg_lock);
        spin_lock_init(&chip->open_lock);
        spin_lock_init(&chip->midi_input_lock);
        spin_lock_init(&chip->mixer_lock);
        chip->irq = -1;
        chip->dma8 = -1;
        chip->dma16 = -1;
        chip->port = port;
        
        if (request_irq(irq, irq_handler,
                        (hardware == SB_HW_ALS4000 ||
                         hardware == SB_HW_CS5530) ?
                        IRQF_SHARED : IRQF_DISABLED,
                        "SoundBlaster", (void *) chip)) {
                snd_printk(KERN_ERR "sb: can't grab irq %d\n", irq);
                snd_sbdsp_free(chip);
                return -EBUSY;
        }
        chip->irq = irq;

        if (hardware == SB_HW_ALS4000)
                goto __skip_allocation;
        
        if ((chip->res_port = request_region(port, 16, "SoundBlaster")) == NULL) {
                snd_printk(KERN_ERR "sb: can't grab port 0x%lx\n", port);
                snd_sbdsp_free(chip);
                return -EBUSY;
        }

#ifdef CONFIG_ISA
        if (dma8 >= 0 && request_dma(dma8, "SoundBlaster - 8bit")) {
                snd_printk(KERN_ERR "sb: can't grab DMA8 %d\n", dma8);
                snd_sbdsp_free(chip);
                return -EBUSY;
        }
        chip->dma8 = dma8;
        if (dma16 >= 0) {
                if (hardware != SB_HW_ALS100 && (dma16 < 5 || dma16 > 7)) {
                        /* no duplex */
                        dma16 = -1;
                } else if (request_dma(dma16, "SoundBlaster - 16bit")) {
                        snd_printk(KERN_ERR "sb: can't grab DMA16 %d\n", dma16);
                        snd_sbdsp_free(chip);
                        return -EBUSY;
                }
        }
        chip->dma16 = dma16;
#endif

      __skip_allocation:
        chip->card = card;
        chip->hardware = hardware;
        if ((err = snd_sbdsp_probe(chip)) < 0) {
                snd_sbdsp_free(chip);
                return err;
        }
        if ((err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops)) < 0) {
                snd_sbdsp_free(chip);
                return err;
        }
        *r_chip = chip;
        return 0;
}

EXPORT_SYMBOL(snd_sbdsp_command);
EXPORT_SYMBOL(snd_sbdsp_get_byte);
EXPORT_SYMBOL(snd_sbdsp_reset);
EXPORT_SYMBOL(snd_sbdsp_create);
/* sb_mixer.c */
EXPORT_SYMBOL(snd_sbmixer_write);
EXPORT_SYMBOL(snd_sbmixer_read);
EXPORT_SYMBOL(snd_sbmixer_new);
EXPORT_SYMBOL(snd_sbmixer_add_ctl);
#ifdef CONFIG_PM
EXPORT_SYMBOL(snd_sbmixer_suspend);
EXPORT_SYMBOL(snd_sbmixer_resume);
#endif

/*
 *  INIT part
 */

static int __init alsa_sb_common_init(void)
{
        return 0;
}

static void __exit alsa_sb_common_exit(void)
{
}

module_init(alsa_sb_common_init)
module_exit(alsa_sb_common_exit)

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