sound/oss/msnd.c

   1 /*********************************************************************
   2  *
   3  * msnd.c - Driver Base
   4  *
   5  * Turtle Beach MultiSound Sound Card Driver for Linux
   6  *
   7  * Copyright (C) 1998 Andrew Veliath
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * $Id: msnd.c,v 1.17 1999/03/21 16:50:09 andrewtv Exp $
  24  *
  25  ********************************************************************/
  26
  27 #include <linux/version.h>
  28 #include <linux/module.h>
  29 #include <linux/kernel.h>
  30 #include <linux/slab.h>
  31 #include <linux/vmalloc.h>
  32 #include <linux/types.h>
  33 #include <linux/delay.h>
  34 #include <linux/mm.h>
  35 #include <linux/init.h>
  36 #include <asm/io.h>
  37 #include <asm/uaccess.h>
  38 #include <linux/spinlock.h>
  39 #include <asm/irq.h>
  40 #include "msnd.h"
  41
  42 #define LOGNAME                 "msnd"
  43
  44 #define MSND_MAX_DEVS           4
  45
  46 static multisound_dev_t         *devs[MSND_MAX_DEVS];
  47 static int                      num_devs;
  48
  49 int __init msnd_register(multisound_dev_t *dev)
  50 {
  51         int i;
  52
  53         for (i = 0; i < MSND_MAX_DEVS; ++i)
  54                 if (devs[i] == NULL)
  55                         break;
  56
  57         if (i == MSND_MAX_DEVS)
  58                 return -ENOMEM;
  59
  60         devs[i] = dev;
  61         ++num_devs;
  62         return 0;
  63 }
  64
  65 void msnd_unregister(multisound_dev_t *dev)
  66 {
  67         int i;
  68
  69         for (i = 0; i < MSND_MAX_DEVS; ++i)
  70                 if (devs[i] == dev)
  71                         break;
  72
  73         if (i == MSND_MAX_DEVS) {
  74                 printk(KERN_WARNING LOGNAME ": Unregistering unknown device\n");
  75                 return;
  76         }
  77
  78         devs[i] = NULL;
  79         --num_devs;
  80 }
  81
  82 int msnd_get_num_devs(void)
  83 {
  84         return num_devs;
  85 }
  86
  87 multisound_dev_t *msnd_get_dev(int j)
  88 {
  89         int i;
  90
  91         for (i = 0; i < MSND_MAX_DEVS && j; ++i)
  92                 if (devs[i] != NULL)
  93                         --j;
  94
  95         if (i == MSND_MAX_DEVS || j != 0)
  96                 return NULL;
  97
  98         return devs[i];
  99 }
 100
 101 void msnd_init_queue(unsigned long base, int start, int size)
 102 {
 103         isa_writew(PCTODSP_BASED(start), base + JQS_wStart);
 104         isa_writew(PCTODSP_OFFSET(size) - 1, base + JQS_wSize);
 105         isa_writew(0, base + JQS_wHead);
 106         isa_writew(0, base + JQS_wTail);
 107 }
 108
 109 void msnd_fifo_init(msnd_fifo *f)
 110 {
 111         f->data = NULL;
 112 }
 113
 114 void msnd_fifo_free(msnd_fifo *f)
 115 {
 116         if (f->data) {
 117                 vfree(f->data);
 118                 f->data = NULL;
 119         }
 120 }
 121
 122 int msnd_fifo_alloc(msnd_fifo *f, size_t n)
 123 {
 124         msnd_fifo_free(f);
 125         f->data = (char *)vmalloc(n);
 126         f->n = n;
 127         f->tail = 0;
 128         f->head = 0;
 129         f->len = 0;
 130
 131         if (!f->data)
 132                 return -ENOMEM;
 133
 134         return 0;
 135 }
 136
 137 void msnd_fifo_make_empty(msnd_fifo *f)
 138 {
 139         f->len = f->tail = f->head = 0;
 140 }
 141
 142 int msnd_fifo_write(msnd_fifo *f, const char *buf, size_t len, int user)
 143 {
 144         int count = 0;
 145
 146         if (f->len == f->n)
 147                 return 0;
 148
 149         while ((count < len) && (f->len != f->n)) {
 150
 151                 int nwritten;
 152
 153                 if (f->head <= f->tail) {
 154                         nwritten = len - count;
 155                         if (nwritten > f->n - f->tail)
 156                                 nwritten = f->n - f->tail;
 157                 }
 158                 else {
 159                         nwritten = f->head - f->tail;
 160                         if (nwritten > len - count)
 161                                 nwritten = len - count;
 162                 }
 163
 164                 if (user) {
 165                         if (copy_from_user(f->data + f->tail, buf, nwritten))
 166                                 return -EFAULT;
 167                 } else
 168                         isa_memcpy_fromio(f->data + f->tail, (unsigned long) buf, nwritten);
 169
 170                 count += nwritten;
 171                 buf += nwritten;
 172                 f->len += nwritten;
 173                 f->tail += nwritten;
 174                 f->tail %= f->n;
 175         }
 176
 177         return count;
 178 }
 179
 180 int msnd_fifo_read(msnd_fifo *f, char *buf, size_t len, int user)
 181 {
 182         int count = 0;
 183
 184         if (f->len == 0)
 185                 return f->len;
 186
 187         while ((count < len) && (f->len > 0)) {
 188
 189                 int nread;
 190
 191                 if (f->tail <= f->head) {
 192                         nread = len - count;
 193                         if (nread > f->n - f->head)
 194                                 nread = f->n - f->head;
 195                 }
 196                 else {
 197                         nread = f->tail - f->head;
 198                         if (nread > len - count)
 199                                 nread = len - count;
 200                 }
 201
 202                 if (user) {
 203                         if (copy_to_user(buf, f->data + f->head, nread))
 204                                 return -EFAULT;
 205                 } else
 206                         isa_memcpy_toio((unsigned long) buf, f->data + f->head, nread);
 207
 208                 count += nread;
 209                 buf += nread;
 210                 f->len -= nread;
 211                 f->head += nread;
 212                 f->head %= f->n;
 213         }
 214
 215         return count;
 216 }
 217
 218 int msnd_wait_TXDE(multisound_dev_t *dev)
 219 {
 220         register unsigned int io = dev->io;
 221         register int timeout = 1000;
 222
 223         while(timeout-- > 0)
 224                 if (inb(io + HP_ISR) & HPISR_TXDE)
 225                         return 0;
 226
 227         return -EIO;
 228 }
 229
 230 int msnd_wait_HC0(multisound_dev_t *dev)
 231 {
 232         register unsigned int io = dev->io;
 233         register int timeout = 1000;
 234
 235         while(timeout-- > 0)
 236                 if (!(inb(io + HP_CVR) & HPCVR_HC))
 237                         return 0;
 238
 239         return -EIO;
 240 }
 241
 242 int msnd_send_dsp_cmd(multisound_dev_t *dev, BYTE cmd)
 243 {
 244         unsigned long flags;
 245
 246         spin_lock_irqsave(&dev->lock, flags);
 247         if (msnd_wait_HC0(dev) == 0) {
 248                 outb(cmd, dev->io + HP_CVR);
 249                 spin_unlock_irqrestore(&dev->lock, flags);
 250                 return 0;
 251         }
 252         spin_unlock_irqrestore(&dev->lock, flags);
 253
 254         printk(KERN_DEBUG LOGNAME ": Send DSP command timeout\n");
 255
 256         return -EIO;
 257 }
 258
 259 int msnd_send_word(multisound_dev_t *dev, unsigned char high,
 260                    unsigned char mid, unsigned char low)
 261 {
 262         register unsigned int io = dev->io;
 263
 264         if (msnd_wait_TXDE(dev) == 0) {
 265                 outb(high, io + HP_TXH);
 266                 outb(mid, io + HP_TXM);
 267                 outb(low, io + HP_TXL);
 268                 return 0;
 269         }
 270
 271         printk(KERN_DEBUG LOGNAME ": Send host word timeout\n");
 272
 273         return -EIO;
 274 }
 275
 276 int msnd_upload_host(multisound_dev_t *dev, char *bin, int len)
 277 {
 278         int i;
 279
 280         if (len % 3 != 0) {
 281                 printk(KERN_WARNING LOGNAME ": Upload host data not multiple of 3!\n");
 282                 return -EINVAL;
 283         }
 284
 285         for (i = 0; i < len; i += 3)
 286                 if (msnd_send_word(dev, bin[i], bin[i + 1], bin[i + 2]) != 0)
 287                         return -EIO;
 288
 289         inb(dev->io + HP_RXL);
 290         inb(dev->io + HP_CVR);
 291
 292         return 0;
 293 }
 294
 295 int msnd_enable_irq(multisound_dev_t *dev)
 296 {
 297         unsigned long flags;
 298
 299         if (dev->irq_ref++)
 300                 return 0;
 301
 302         printk(KERN_DEBUG LOGNAME ": Enabling IRQ\n");
 303
 304         spin_lock_irqsave(&dev->lock, flags);
 305         if (msnd_wait_TXDE(dev) == 0) {
 306                 outb(inb(dev->io + HP_ICR) | HPICR_TREQ, dev->io + HP_ICR);
 307                 if (dev->type == msndClassic)
 308                         outb(dev->irqid, dev->io + HP_IRQM);
 309                 outb(inb(dev->io + HP_ICR) & ~HPICR_TREQ, dev->io + HP_ICR);
 310                 outb(inb(dev->io + HP_ICR) | HPICR_RREQ, dev->io + HP_ICR);
 311                 enable_irq(dev->irq);
 312                 msnd_init_queue(dev->DSPQ, dev->dspq_data_buff, dev->dspq_buff_size);
 313                 spin_unlock_irqrestore(&dev->lock, flags);
 314                 return 0;
 315         }
 316         spin_unlock_irqrestore(&dev->lock, flags);
 317
 318         printk(KERN_DEBUG LOGNAME ": Enable IRQ failed\n");
 319
 320         return -EIO;
 321 }
 322
 323 int msnd_disable_irq(multisound_dev_t *dev)
 324 {
 325         unsigned long flags;
 326
 327         if (--dev->irq_ref > 0)
 328                 return 0;
 329
 330         if (dev->irq_ref < 0)
 331                 printk(KERN_DEBUG LOGNAME ": IRQ ref count is %d\n", dev->irq_ref);
 332
 333         printk(KERN_DEBUG LOGNAME ": Disabling IRQ\n");
 334
 335         spin_lock_irqsave(&dev->lock, flags);
 336         if (msnd_wait_TXDE(dev) == 0) {
 337                 outb(inb(dev->io + HP_ICR) & ~HPICR_RREQ, dev->io + HP_ICR);
 338                 if (dev->type == msndClassic)
 339                         outb(HPIRQ_NONE, dev->io + HP_IRQM);
 340                 disable_irq(dev->irq);
 341                 spin_unlock_irqrestore(&dev->lock, flags);
 342                 return 0;
 343         }
 344         spin_unlock_irqrestore(&dev->lock, flags);
 345
 346         printk(KERN_DEBUG LOGNAME ": Disable IRQ failed\n");
 347
 348         return -EIO;
 349 }
 350
 351 #ifndef LINUX20
 352 EXPORT_SYMBOL(msnd_register);
 353 EXPORT_SYMBOL(msnd_unregister);
 354 EXPORT_SYMBOL(msnd_get_num_devs);
 355 EXPORT_SYMBOL(msnd_get_dev);
 356
 357 EXPORT_SYMBOL(msnd_init_queue);
 358
 359 EXPORT_SYMBOL(msnd_fifo_init);
 360 EXPORT_SYMBOL(msnd_fifo_free);
 361 EXPORT_SYMBOL(msnd_fifo_alloc);
 362 EXPORT_SYMBOL(msnd_fifo_make_empty);
 363 EXPORT_SYMBOL(msnd_fifo_write);
 364 EXPORT_SYMBOL(msnd_fifo_read);
 365
 366 EXPORT_SYMBOL(msnd_wait_TXDE);
 367 EXPORT_SYMBOL(msnd_wait_HC0);
 368 EXPORT_SYMBOL(msnd_send_dsp_cmd);
 369 EXPORT_SYMBOL(msnd_send_word);
 370 EXPORT_SYMBOL(msnd_upload_host);
 371
 372 EXPORT_SYMBOL(msnd_enable_irq);
 373 EXPORT_SYMBOL(msnd_disable_irq);
 374 #endif
 375
 376 #ifdef MODULE
 377 MODULE_AUTHOR                           ("Andrew Veliath <andrewtv@usa.net>");
 378 MODULE_DESCRIPTION                      ("Turtle Beach MultiSound Driver Base");
 379 MODULE_LICENSE("GPL");
 380
 381
 382 int init_module(void)
 383 {
 384         return 0;
 385 }
 386
 387 void cleanup_module(void)
 388 {
 389 }
 390 #endif