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 <linux/interrupt.h>
  37
  38 #include <asm/io.h>
  39 #include <asm/uaccess.h>
  40 #include <linux/spinlock.h>
  41 #include <asm/irq.h>
  42 #include "msnd.h"
  43
  44 #define LOGNAME                 "msnd"
  45
  46 #define MSND_MAX_DEVS           4
  47
  48 static multisound_dev_t         *devs[MSND_MAX_DEVS];
  49 static int                      num_devs;
  50
  51 int __init msnd_register(multisound_dev_t *dev)
  52 {
  53         int i;
  54
  55         for (i = 0; i < MSND_MAX_DEVS; ++i)
  56                 if (devs[i] == NULL)
  57                         break;
  58
  59         if (i == MSND_MAX_DEVS)
  60                 return -ENOMEM;
  61
  62         devs[i] = dev;
  63         ++num_devs;
  64         return 0;
  65 }
  66
  67 void msnd_unregister(multisound_dev_t *dev)
  68 {
  69         int i;
  70
  71         for (i = 0; i < MSND_MAX_DEVS; ++i)
  72                 if (devs[i] == dev)
  73                         break;
  74
  75         if (i == MSND_MAX_DEVS) {
  76                 printk(KERN_WARNING LOGNAME ": Unregistering unknown device\n");
  77                 return;
  78         }
  79
  80         devs[i] = NULL;
  81         --num_devs;
  82 }
  83
  84 void msnd_init_queue(void __iomem *base, int start, int size)
  85 {
  86         writew(PCTODSP_BASED(start), base + JQS_wStart);
  87         writew(PCTODSP_OFFSET(size) - 1, base + JQS_wSize);
  88         writew(0, base + JQS_wHead);
  89         writew(0, base + JQS_wTail);
  90 }
  91
  92 void msnd_fifo_init(msnd_fifo *f)
  93 {
  94         f->data = NULL;
  95 }
  96
  97 void msnd_fifo_free(msnd_fifo *f)
  98 {
  99         if (f->data) {
 100                 vfree(f->data);
 101                 f->data = NULL;
 102         }
 103 }
 104
 105 int msnd_fifo_alloc(msnd_fifo *f, size_t n)
 106 {
 107         msnd_fifo_free(f);
 108         f->data = (char *)vmalloc(n);
 109         f->n = n;
 110         f->tail = 0;
 111         f->head = 0;
 112         f->len = 0;
 113
 114         if (!f->data)
 115                 return -ENOMEM;
 116
 117         return 0;
 118 }
 119
 120 void msnd_fifo_make_empty(msnd_fifo *f)
 121 {
 122         f->len = f->tail = f->head = 0;
 123 }
 124
 125 int msnd_fifo_write_io(msnd_fifo *f, char __iomem *buf, size_t len)
 126 {
 127         int count = 0;
 128
 129         while ((count < len) && (f->len != f->n)) {
 130
 131                 int nwritten;
 132
 133                 if (f->head <= f->tail) {
 134                         nwritten = len - count;
 135                         if (nwritten > f->n - f->tail)
 136                                 nwritten = f->n - f->tail;
 137                 }
 138                 else {
 139                         nwritten = f->head - f->tail;
 140                         if (nwritten > len - count)
 141                                 nwritten = len - count;
 142                 }
 143
 144                 memcpy_fromio(f->data + f->tail, buf, nwritten);
 145
 146                 count += nwritten;
 147                 buf += nwritten;
 148                 f->len += nwritten;
 149                 f->tail += nwritten;
 150                 f->tail %= f->n;
 151         }
 152
 153         return count;
 154 }
 155
 156 int msnd_fifo_write(msnd_fifo *f, const char *buf, size_t len)
 157 {
 158         int count = 0;
 159
 160         while ((count < len) && (f->len != f->n)) {
 161
 162                 int nwritten;
 163
 164                 if (f->head <= f->tail) {
 165                         nwritten = len - count;
 166                         if (nwritten > f->n - f->tail)
 167                                 nwritten = f->n - f->tail;
 168                 }
 169                 else {
 170                         nwritten = f->head - f->tail;
 171                         if (nwritten > len - count)
 172                                 nwritten = len - count;
 173                 }
 174
 175                 memcpy(f->data + f->tail, buf, nwritten);
 176
 177                 count += nwritten;
 178                 buf += nwritten;
 179                 f->len += nwritten;
 180                 f->tail += nwritten;
 181                 f->tail %= f->n;
 182         }
 183
 184         return count;
 185 }
 186
 187 int msnd_fifo_read_io(msnd_fifo *f, char __iomem *buf, size_t len)
 188 {
 189         int count = 0;
 190
 191         while ((count < len) && (f->len > 0)) {
 192
 193                 int nread;
 194
 195                 if (f->tail <= f->head) {
 196                         nread = len - count;
 197                         if (nread > f->n - f->head)
 198                                 nread = f->n - f->head;
 199                 }
 200                 else {
 201                         nread = f->tail - f->head;
 202                         if (nread > len - count)
 203                                 nread = len - count;
 204                 }
 205
 206                 memcpy_toio(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_fifo_read(msnd_fifo *f, char *buf, size_t len)
 219 {
 220         int count = 0;
 221
 222         while ((count < len) && (f->len > 0)) {
 223
 224                 int nread;
 225
 226                 if (f->tail <= f->head) {
 227                         nread = len - count;
 228                         if (nread > f->n - f->head)
 229                                 nread = f->n - f->head;
 230                 }
 231                 else {
 232                         nread = f->tail - f->head;
 233                         if (nread > len - count)
 234                                 nread = len - count;
 235                 }
 236
 237                 memcpy(buf, f->data + f->head, nread);
 238
 239                 count += nread;
 240                 buf += nread;
 241                 f->len -= nread;
 242                 f->head += nread;
 243                 f->head %= f->n;
 244         }
 245
 246         return count;
 247 }
 248
 249 static int msnd_wait_TXDE(multisound_dev_t *dev)
 250 {
 251         register unsigned int io = dev->io;
 252         register int timeout = 1000;
 253
 254         while(timeout-- > 0)
 255                 if (msnd_inb(io + HP_ISR) & HPISR_TXDE)
 256                         return 0;
 257
 258         return -EIO;
 259 }
 260
 261 static int msnd_wait_HC0(multisound_dev_t *dev)
 262 {
 263         register unsigned int io = dev->io;
 264         register int timeout = 1000;
 265
 266         while(timeout-- > 0)
 267                 if (!(msnd_inb(io + HP_CVR) & HPCVR_HC))
 268                         return 0;
 269
 270         return -EIO;
 271 }
 272
 273 int msnd_send_dsp_cmd(multisound_dev_t *dev, BYTE cmd)
 274 {
 275         unsigned long flags;
 276
 277         spin_lock_irqsave(&dev->lock, flags);
 278         if (msnd_wait_HC0(dev) == 0) {
 279                 msnd_outb(cmd, dev->io + HP_CVR);
 280                 spin_unlock_irqrestore(&dev->lock, flags);
 281                 return 0;
 282         }
 283         spin_unlock_irqrestore(&dev->lock, flags);
 284
 285         printk(KERN_DEBUG LOGNAME ": Send DSP command timeout\n");
 286
 287         return -EIO;
 288 }
 289
 290 int msnd_send_word(multisound_dev_t *dev, unsigned char high,
 291                    unsigned char mid, unsigned char low)
 292 {
 293         register unsigned int io = dev->io;
 294
 295         if (msnd_wait_TXDE(dev) == 0) {
 296                 msnd_outb(high, io + HP_TXH);
 297                 msnd_outb(mid, io + HP_TXM);
 298                 msnd_outb(low, io + HP_TXL);
 299                 return 0;
 300         }
 301
 302         printk(KERN_DEBUG LOGNAME ": Send host word timeout\n");
 303
 304         return -EIO;
 305 }
 306
 307 int msnd_upload_host(multisound_dev_t *dev, char *bin, int len)
 308 {
 309         int i;
 310
 311         if (len % 3 != 0) {
 312                 printk(KERN_WARNING LOGNAME ": Upload host data not multiple of 3!\n");
 313                 return -EINVAL;
 314         }
 315
 316         for (i = 0; i < len; i += 3)
 317                 if (msnd_send_word(dev, bin[i], bin[i + 1], bin[i + 2]) != 0)
 318                         return -EIO;
 319
 320         msnd_inb(dev->io + HP_RXL);
 321         msnd_inb(dev->io + HP_CVR);
 322
 323         return 0;
 324 }
 325
 326 int msnd_enable_irq(multisound_dev_t *dev)
 327 {
 328         unsigned long flags;
 329
 330         if (dev->irq_ref++)
 331                 return 0;
 332
 333         printk(KERN_DEBUG LOGNAME ": Enabling IRQ\n");
 334
 335         spin_lock_irqsave(&dev->lock, flags);
 336         if (msnd_wait_TXDE(dev) == 0) {
 337                 msnd_outb(msnd_inb(dev->io + HP_ICR) | HPICR_TREQ, dev->io + HP_ICR);
 338                 if (dev->type == msndClassic)
 339                         msnd_outb(dev->irqid, dev->io + HP_IRQM);
 340                 msnd_outb(msnd_inb(dev->io + HP_ICR) & ~HPICR_TREQ, dev->io + HP_ICR);
 341                 msnd_outb(msnd_inb(dev->io + HP_ICR) | HPICR_RREQ, dev->io + HP_ICR);
 342                 enable_irq(dev->irq);
 343                 msnd_init_queue(dev->DSPQ, dev->dspq_data_buff, dev->dspq_buff_size);
 344                 spin_unlock_irqrestore(&dev->lock, flags);
 345                 return 0;
 346         }
 347         spin_unlock_irqrestore(&dev->lock, flags);
 348
 349         printk(KERN_DEBUG LOGNAME ": Enable IRQ failed\n");
 350
 351         return -EIO;
 352 }
 353
 354 int msnd_disable_irq(multisound_dev_t *dev)
 355 {
 356         unsigned long flags;
 357
 358         if (--dev->irq_ref > 0)
 359                 return 0;
 360
 361         if (dev->irq_ref < 0)
 362                 printk(KERN_DEBUG LOGNAME ": IRQ ref count is %d\n", dev->irq_ref);
 363
 364         printk(KERN_DEBUG LOGNAME ": Disabling IRQ\n");
 365
 366         spin_lock_irqsave(&dev->lock, flags);
 367         if (msnd_wait_TXDE(dev) == 0) {
 368                 msnd_outb(msnd_inb(dev->io + HP_ICR) & ~HPICR_RREQ, dev->io + HP_ICR);
 369                 if (dev->type == msndClassic)
 370                         msnd_outb(HPIRQ_NONE, dev->io + HP_IRQM);
 371                 disable_irq(dev->irq);
 372                 spin_unlock_irqrestore(&dev->lock, flags);
 373                 return 0;
 374         }
 375         spin_unlock_irqrestore(&dev->lock, flags);
 376
 377         printk(KERN_DEBUG LOGNAME ": Disable IRQ failed\n");
 378
 379         return -EIO;
 380 }
 381
 382 #ifndef LINUX20
 383 EXPORT_SYMBOL(msnd_register);
 384 EXPORT_SYMBOL(msnd_unregister);
 385
 386 EXPORT_SYMBOL(msnd_init_queue);
 387
 388 EXPORT_SYMBOL(msnd_fifo_init);
 389 EXPORT_SYMBOL(msnd_fifo_free);
 390 EXPORT_SYMBOL(msnd_fifo_alloc);
 391 EXPORT_SYMBOL(msnd_fifo_make_empty);
 392 EXPORT_SYMBOL(msnd_fifo_write_io);
 393 EXPORT_SYMBOL(msnd_fifo_read_io);
 394 EXPORT_SYMBOL(msnd_fifo_write);
 395 EXPORT_SYMBOL(msnd_fifo_read);
 396
 397 EXPORT_SYMBOL(msnd_send_dsp_cmd);
 398 EXPORT_SYMBOL(msnd_send_word);
 399 EXPORT_SYMBOL(msnd_upload_host);
 400
 401 EXPORT_SYMBOL(msnd_enable_irq);
 402 EXPORT_SYMBOL(msnd_disable_irq);
 403 #endif
 404
 405 #ifdef MODULE
 406 MODULE_AUTHOR                           ("Andrew Veliath <andrewtv@usa.net>");
 407 MODULE_DESCRIPTION                      ("Turtle Beach MultiSound Driver Base");
 408 MODULE_LICENSE("GPL");
 409
 410
 411 int init_module(void)
 412 {
 413         return 0;
 414 }
 415
 416 void cleanup_module(void)
 417 {
 418 }
 419 #endif