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root/sound/pci/cs5530.c

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DEFINITIONS

This source file includes following definitions.
  1. snd_cs5530_free
  2. snd_cs5530_dev_free
  3. snd_cs5530_remove
  4. snd_cs5530_mixer_read
  5. snd_cs5530_create
  6. snd_cs5530_probe
  7. alsa_card_cs5530_init
  8. alsa_card_cs5530_exit

/*
 * cs5530.c - Initialisation code for Cyrix/NatSemi VSA1 softaudio
 *
 *      (C) Copyright 2007 Ash Willis <ashwillis@programmer.net>
 *      (C) Copyright 2003 Red Hat Inc <alan@redhat.com>
 *
 * This driver was ported (shamelessly ripped ;) from oss/kahlua.c but I did
 * mess with it a bit. The chip seems to have to have trouble with full duplex
 * mode. If we're recording in 8bit 8000kHz, say, and we then attempt to
 * simultaneously play back audio at 16bit 44100kHz, the device actually plays
 * back in the same format in which it is capturing. By forcing the chip to
 * always play/capture in 16/44100, we can let alsa-lib convert the samples and
 * that way we can hack up some full duplex audio. 
 * 
 * XpressAudio(tm) is used on the Cyrix MediaGX (now NatSemi Geode) systems.
 * The older version (VSA1) provides fairly good soundblaster emulation
 * although there are a couple of bugs: large DMA buffers break record,
 * and the MPU event handling seems suspect. VSA2 allows the native driver
 * to control the AC97 audio engine directly and requires a different driver.
 *
 * Thanks to National Semiconductor for providing the needed information
 * on the XpressAudio(tm) internals.
 *
 * 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, 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.
 *
 * TO DO:
 *      Investigate whether we can portably support Cognac (5520) in the
 *      same manner.
 */

#include <linux/delay.h>
#include <linux/moduleparam.h>
#include <linux/pci.h>
#include <sound/core.h>
#include <sound/sb.h>
#include <sound/initval.h>

MODULE_AUTHOR("Ash Willis");
MODULE_DESCRIPTION("CS5530 Audio");
MODULE_LICENSE("GPL");

static int index[SNDRV_CARDS] = SNDRV_DEFAULT_IDX;
static char *id[SNDRV_CARDS] = SNDRV_DEFAULT_STR;
static int enable[SNDRV_CARDS] = SNDRV_DEFAULT_ENABLE_PNP;

struct snd_cs5530 {
        struct snd_card *card;
        struct pci_dev *pci;
        struct snd_sb *sb;
        unsigned long pci_base;
};

static struct pci_device_id snd_cs5530_ids[] = {
        {PCI_VENDOR_ID_CYRIX, PCI_DEVICE_ID_CYRIX_5530_AUDIO, PCI_ANY_ID,
                                                        PCI_ANY_ID, 0, 0},
        {0,}
};

MODULE_DEVICE_TABLE(pci, snd_cs5530_ids);

static int snd_cs5530_free(struct snd_cs5530 *chip)
{
        pci_release_regions(chip->pci);
        pci_disable_device(chip->pci);
        kfree(chip);
        return 0;
}

static int snd_cs5530_dev_free(struct snd_device *device)
{
        struct snd_cs5530 *chip = device->device_data;
        return snd_cs5530_free(chip);
}

static void __devexit snd_cs5530_remove(struct pci_dev *pci)
{
        snd_card_free(pci_get_drvdata(pci));
        pci_set_drvdata(pci, NULL);
}

static u8 __devinit snd_cs5530_mixer_read(unsigned long io, u8 reg)
{
        outb(reg, io + 4);
        udelay(20);
        reg = inb(io + 5);
        udelay(20);
        return reg;
}

static int __devinit snd_cs5530_create(struct snd_card *card,
                                       struct pci_dev *pci,
                                       struct snd_cs5530 **rchip)
{
        struct snd_cs5530 *chip;
        unsigned long sb_base;
        u8 irq, dma8, dma16 = 0;
        u16 map;
        void __iomem *mem;
        int err;

        static struct snd_device_ops ops = {
                .dev_free = snd_cs5530_dev_free,
        };
        *rchip = NULL;

        err = pci_enable_device(pci);
        if (err < 0)
                return err;

        chip = kzalloc(sizeof(*chip), GFP_KERNEL);
        if (chip == NULL) {
                pci_disable_device(pci);
                return -ENOMEM;
        }

        chip->card = card;
        chip->pci = pci;

        err = pci_request_regions(pci, "CS5530");
        if (err < 0) {
                kfree(chip); 
                pci_disable_device(pci);
                return err;
        }
        chip->pci_base = pci_resource_start(pci, 0);

        mem = ioremap_nocache(chip->pci_base, pci_resource_len(pci, 0));
        if (mem == NULL) {
                kfree(chip);
                pci_disable_device(pci);
                return -EBUSY;
        }

        map = readw(mem + 0x18);
        iounmap(mem);

        /* Map bits
                0:1     * 0x20 + 0x200 = sb base
                2       sb enable
                3       adlib enable
                5       MPU enable 0x330
                6       MPU enable 0x300

           The other bits may be used internally so must be masked */

        sb_base = 0x220 + 0x20 * (map & 3);

        if (map & (1<<2))
                printk(KERN_INFO "CS5530: XpressAudio at 0x%lx\n", sb_base);
        else {
                printk(KERN_ERR "Could not find XpressAudio!\n");
                snd_cs5530_free(chip);
                return -ENODEV;
        }

        if (map & (1<<5))
                printk(KERN_INFO "CS5530: MPU at 0x300\n");
        else if (map & (1<<6))
                printk(KERN_INFO "CS5530: MPU at 0x330\n");

        irq = snd_cs5530_mixer_read(sb_base, 0x80) & 0x0F;
        dma8 = snd_cs5530_mixer_read(sb_base, 0x81);

        if (dma8 & 0x20)
                dma16 = 5;
        else if (dma8 & 0x40)
                dma16 = 6;
        else if (dma8 & 0x80)
                dma16 = 7;
        else {
                printk(KERN_ERR "CS5530: No 16bit DMA enabled\n");
                snd_cs5530_free(chip);
                return -ENODEV;
        }

        if (dma8 & 0x01)
                dma8 = 0;
        else if (dma8 & 02)
                dma8 = 1;
        else if (dma8 & 0x08)
                dma8 = 3;
        else {
                printk(KERN_ERR "CS5530: No 8bit DMA enabled\n");
                snd_cs5530_free(chip);
                return -ENODEV;
        }

        if (irq & 1)
                irq = 9;
        else if (irq & 2)
                irq = 5;
        else if (irq & 4)
                irq = 7;
        else if (irq & 8)
                irq = 10;
        else {
                printk(KERN_ERR "CS5530: SoundBlaster IRQ not set\n");
                snd_cs5530_free(chip);
                return -ENODEV;
        }

        printk(KERN_INFO "CS5530: IRQ: %d DMA8: %d DMA16: %d\n", irq, dma8, 
                                                                        dma16);

        err = snd_sbdsp_create(card, sb_base, irq, snd_sb16dsp_interrupt, dma8,
                                                dma16, SB_HW_CS5530, &chip->sb);
        if (err < 0) {
                printk(KERN_ERR "CS5530: Could not create SoundBlaster\n");
                snd_cs5530_free(chip);
                return err;
        }

        err = snd_sb16dsp_pcm(chip->sb, 0, &chip->sb->pcm);
        if (err < 0) {
                printk(KERN_ERR "CS5530: Could not create PCM\n");
                snd_cs5530_free(chip);
                return err;
        }

        err = snd_sbmixer_new(chip->sb);
        if (err < 0) {
                printk(KERN_ERR "CS5530: Could not create Mixer\n");
                snd_cs5530_free(chip);
                return err;
        }

        err = snd_device_new(card, SNDRV_DEV_LOWLEVEL, chip, &ops);
        if (err < 0) {
                snd_cs5530_free(chip);
                return err;
        }

        snd_card_set_dev(card, &pci->dev);
        *rchip = chip;
        return 0;
}

static int __devinit snd_cs5530_probe(struct pci_dev *pci,
                                        const struct pci_device_id *pci_id)
{
        static int dev;
        struct snd_card *card;
        struct snd_cs5530 *chip = NULL;
        int err;

        if (dev >= SNDRV_CARDS)
                return -ENODEV;
        if (!enable[dev]) {
                dev++;
                return -ENOENT;
        }

        card = snd_card_new(index[dev], id[dev], THIS_MODULE, 0);

        if (card == NULL)
                return -ENOMEM;

        err = snd_cs5530_create(card, pci, &chip);
        if (err < 0) {
                snd_card_free(card);
                return err;
        }

        strcpy(card->driver, "CS5530");
        strcpy(card->shortname, "CS5530 Audio");
        sprintf(card->longname, "%s at 0x%lx", card->shortname, chip->pci_base);

        err = snd_card_register(card);
        if (err < 0) {
                snd_card_free(card);
                return err;
        }
        pci_set_drvdata(pci, card);
        dev++;
        return 0;
}

static struct pci_driver driver = {
        .name = "CS5530_Audio",
        .id_table = snd_cs5530_ids,
        .probe = snd_cs5530_probe,
        .remove = __devexit_p(snd_cs5530_remove),
};

static int __init alsa_card_cs5530_init(void)
{
        return pci_register_driver(&driver);
}

static void __exit alsa_card_cs5530_exit(void)
{
        pci_unregister_driver(&driver);
}

module_init(alsa_card_cs5530_init)
module_exit(alsa_card_cs5530_exit)


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