/*
 *  Copyright (c) 1998-2002 by Paul Davis <pbd@op.net>
 *
 *  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/io.h>
#include <linux/init.h>
#include <linux/time.h>
#include <linux/wait.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/firmware.h>
#include <sound/core.h>
#include <sound/snd_wavefront.h>
#include <sound/initval.h>

/* Control bits for the Load Control Register
 */

#define FX_LSB_TRANSFER 0x01    /* transfer after DSP LSB byte written */
#define FX_MSB_TRANSFER 0x02    /* transfer after DSP MSB byte written */
#define FX_AUTO_INCR    0x04    /* auto-increment DSP address after transfer */

#define WAIT_IDLE       0xff

static int
wavefront_fx_idle (snd_wavefront_t *dev)

{
        int i;
        unsigned int x = 0x80;

        for (i = 0; i < 1000; i++) {
                x = inb (dev->fx_status);
                if ((x & 0x80) == 0) {
                        break;
                }
        }

        if (x & 0x80) {
                snd_printk ("FX device never idle.\n");
                return 0;
        }

        return (1);
}

static void
wavefront_fx_mute (snd_wavefront_t *dev, int onoff)

{
        if (!wavefront_fx_idle(dev)) {
                return;
        }

        outb (onoff ? 0x02 : 0x00, dev->fx_op);
}

static int
wavefront_fx_memset (snd_wavefront_t *dev,
                     int page,
                     int addr,
                     int cnt,
                     unsigned short *data)
{
        if (page < 0 || page > 7) {
                snd_printk ("FX memset: "
                        "page must be >= 0 and <= 7\n");
                return -EINVAL;
        }

        if (addr < 0 || addr > 0x7f) {
                snd_printk ("FX memset: "
                        "addr must be >= 0 and <= 7f\n");
                return -EINVAL;
        }

        if (cnt == 1) {

                outb (FX_LSB_TRANSFER, dev->fx_lcr);
                outb (page, dev->fx_dsp_page);
                outb (addr, dev->fx_dsp_addr);
                outb ((data[0] >> 8), dev->fx_dsp_msb);
                outb ((data[0] & 0xff), dev->fx_dsp_lsb);

                snd_printk ("FX: addr %d:%x set to 0x%x\n",
                        page, addr, data[0]);

        } else {
                int i;

                outb (FX_AUTO_INCR|FX_LSB_TRANSFER, dev->fx_lcr);
                outb (page, dev->fx_dsp_page);
                outb (addr, dev->fx_dsp_addr);

                for (i = 0; i < cnt; i++) {
                        outb ((data[i] >> 8), dev->fx_dsp_msb);
                        outb ((data[i] & 0xff), dev->fx_dsp_lsb);
                        if (!wavefront_fx_idle (dev)) {
                                break;
                        }
                }

                if (i != cnt) {
                        snd_printk ("FX memset "
                                    "(0x%x, 0x%x, 0x%lx, %d) incomplete\n",
                                    page, addr, (unsigned long) data, cnt);
                        return -EIO;
                }
        }

        return 0;
}

int
snd_wavefront_fx_detect (snd_wavefront_t *dev)

{
        /* This is a crude check, but its the best one I have for now.
           Certainly on the Maui and the Tropez, wavefront_fx_idle() will
           report "never idle", which suggests that this test should
           work OK.
        */

        if (inb (dev->fx_status) & 0x80) {
                snd_printk ("Hmm, probably a Maui or Tropez.\n");
                return -1;
        }

        return 0;
}

int
snd_wavefront_fx_open (struct snd_hwdep *hw, struct file *file)

{
        if (!try_module_get(hw->card->module))
                return -EFAULT;
        file->private_data = hw;
        return 0;
}

int 
snd_wavefront_fx_release (struct snd_hwdep *hw, struct file *file)

{
        module_put(hw->card->module);
        return 0;
}

int
snd_wavefront_fx_ioctl (struct snd_hwdep *sdev, struct file *file,
                        unsigned int cmd, unsigned long arg)

{
        struct snd_card *card;
        snd_wavefront_card_t *acard;
        snd_wavefront_t *dev;
        wavefront_fx_info r;
        unsigned short *page_data = NULL;
        unsigned short *pd;
        int err = 0;

        card = sdev->card;
        if (snd_BUG_ON(!card))
                return -ENODEV;
        if (snd_BUG_ON(!card->private_data))
                return -ENODEV;

        acard = card->private_data;
        dev = &acard->wavefront;

        if (copy_from_user (&r, (void __user *)arg, sizeof (wavefront_fx_info)))
                return -EFAULT;

        switch (r.request) {
        case WFFX_MUTE:
                wavefront_fx_mute (dev, r.data[0]);
                return -EIO;

        case WFFX_MEMSET:
                if (r.data[2] <= 0) {
                        snd_printk ("cannot write "
                                "<= 0 bytes to FX\n");
                        return -EIO;
                } else if (r.data[2] == 1) {
                        pd = (unsigned short *) &r.data[3];
                } else {
                        if (r.data[2] > 256) {
                                snd_printk ("cannot write "
                                            "> 512 bytes to FX\n");
                                return -EIO;
                        }
                        page_data = memdup_user((unsigned char __user *)
                                                r.data[3],
                                                r.data[2] * sizeof(short));
                        if (IS_ERR(page_data))
                                return PTR_ERR(page_data);
                        pd = page_data;
                }

                err = wavefront_fx_memset (dev,
                             r.data[0], /* page */
                             r.data[1], /* addr */
                             r.data[2], /* cnt */
                             pd);
                kfree(page_data);
                break;

        default:
                snd_printk ("FX: ioctl %d not yet supported\n",
                            r.request);
                return -ENOTTY;
        }
        return err;
}

/* YSS225 initialization.

   This code was developed using DOSEMU. The Turtle Beach SETUPSND
   utility was run with I/O tracing in DOSEMU enabled, and a reconstruction
   of the port I/O done, using the Yamaha faxback document as a guide
   to add more logic to the code. Its really pretty weird.

   This is the approach of just dumping the whole I/O
   sequence as a series of port/value pairs and a simple loop
   that outputs it.
*/

int
snd_wavefront_fx_start (snd_wavefront_t *dev)
{
        unsigned int i;
        int err;
        const struct firmware *firmware = NULL;

        if (dev->fx_initialized)
                return 0;

        err = request_firmware(&firmware, "yamaha/yss225_registers.bin",
                               dev->card->dev);
        if (err < 0) {
                err = -1;
                goto out;
        }

        for (i = 0; i + 1 < firmware->size; i += 2) {
                if (firmware->data[i] >= 8 && firmware->data[i] < 16) {
                        outb(firmware->data[i + 1],
                             dev->base + firmware->data[i]);
                } else if (firmware->data[i] == WAIT_IDLE) {
                        if (!wavefront_fx_idle(dev)) {
                                err = -1;
                                goto out;
                        }
                } else {
                        snd_printk(KERN_ERR "invalid address"
                                   " in register data\n");
                        err = -1;
                        goto out;
                }
        }

        dev->fx_initialized = 1;
        err = 0;

out:
        release_firmware(firmware);
        return err;
}

MODULE_FIRMWARE("yamaha/yss225_registers.bin");