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)
 143 {
 144         int count = 0;
 145
 146         while ((count < len) && (f->len != f->n)) {
 147
 148                 int nwritten;
 149
 150                 if (f->head <= f->tail) {
 151                         nwritten = len - count;
 152                         if (nwritten > f->n - f->tail)
 153                                 nwritten = f->n - f->tail;
 154                 }
 155                 else {
 156                         nwritten = f->head - f->tail;
 157                         if (nwritten > len - count)
 158                                 nwritten = len - count;
 159                 }
 160
 161                 isa_memcpy_fromio(f->data + f->tail, (unsigned long) buf, nwritten);
 162
 163                 count += nwritten;
 164                 buf += nwritten;
 165                 f->len += nwritten;
 166                 f->tail += nwritten;
 167                 f->tail %= f->n;
 168         }
 169
 170         return count;
 171 }
 172
 173 int msnd_fifo_read(msnd_fifo *f, char *buf, size_t len)
 174 {
 175         int count = 0;
 176
 177         while ((count < len) && (f->len > 0)) {
 178
 179                 int nread;
 180
 181                 if (f->tail <= f->head) {
 182                         nread = len - count;
 183                         if (nread > f->n - f->head)
 184                                 nread = f->n - f->head;
 185                 }
 186                 else {
 187                         nread = f->tail - f->head;
 188                         if (nread > len - count)
 189                                 nread = len - count;
 190                 }
 191
 192                 isa_memcpy_toio((unsigned long) buf, f->data + f->head, nread);
 193
 194                 count += nread;
 195                 buf += nread;
 196                 f->len -= nread;
 197                 f->head += nread;
 198                 f->head %= f->n;
 199         }
 200
 201         return count;
 202 }
 203
 204 int msnd_wait_TXDE(multisound_dev_t *dev)
 205 {
 206         register unsigned int io = dev->io;
 207         register int timeout = 1000;
 208
 209         while(timeout-- > 0)
 210                 if (inb(io + HP_ISR) & HPISR_TXDE)
 211                         return 0;
 212
 213         return -EIO;
 214 }
 215
 216 int msnd_wait_HC0(multisound_dev_t *dev)
 217 {
 218         register unsigned int io = dev->io;
 219         register int timeout = 1000;
 220
 221         while(timeout-- > 0)
 222                 if (!(inb(io + HP_CVR) & HPCVR_HC))
 223                         return 0;
 224
 225         return -EIO;
 226 }
 227
 228 int msnd_send_dsp_cmd(multisound_dev_t *dev, BYTE cmd)
 229 {
 230         unsigned long flags;
 231
 232         spin_lock_irqsave(&dev->lock, flags);
 233         if (msnd_wait_HC0(dev) == 0) {
 234                 outb(cmd, dev->io + HP_CVR);
 235                 spin_unlock_irqrestore(&dev->lock, flags);
 236                 return 0;
 237         }
 238         spin_unlock_irqrestore(&dev->lock, flags);
 239
 240         printk(KERN_DEBUG LOGNAME ": Send DSP command timeout\n");
 241
 242         return -EIO;
 243 }
 244
 245 int msnd_send_word(multisound_dev_t *dev, unsigned char high,
 246                    unsigned char mid, unsigned char low)
 247 {
 248         register unsigned int io = dev->io;
 249
 250         if (msnd_wait_TXDE(dev) == 0) {
 251                 outb(high, io + HP_TXH);
 252                 outb(mid, io + HP_TXM);
 253                 outb(low, io + HP_TXL);
 254                 return 0;
 255         }
 256
 257         printk(KERN_DEBUG LOGNAME ": Send host word timeout\n");
 258
 259         return -EIO;
 260 }
 261
 262 int msnd_upload_host(multisound_dev_t *dev, char *bin, int len)
 263 {
 264         int i;
 265
 266         if (len % 3 != 0) {
 267                 printk(KERN_WARNING LOGNAME ": Upload host data not multiple of 3!\n");
 268                 return -EINVAL;
 269         }
 270
 271         for (i = 0; i < len; i += 3)
 272                 if (msnd_send_word(dev, bin[i], bin[i + 1], bin[i + 2]) != 0)
 273                         return -EIO;
 274
 275         inb(dev->io + HP_RXL);
 276         inb(dev->io + HP_CVR);
 277
 278         return 0;
 279 }
 280
 281 int msnd_enable_irq(multisound_dev_t *dev)
 282 {
 283         unsigned long flags;
 284
 285         if (dev->irq_ref++)
 286                 return 0;
 287
 288         printk(KERN_DEBUG LOGNAME ": Enabling IRQ\n");
 289
 290         spin_lock_irqsave(&dev->lock, flags);
 291         if (msnd_wait_TXDE(dev) == 0) {
 292                 outb(inb(dev->io + HP_ICR) | HPICR_TREQ, dev->io + HP_ICR);
 293                 if (dev->type == msndClassic)
 294                         outb(dev->irqid, dev->io + HP_IRQM);
 295                 outb(inb(dev->io + HP_ICR) & ~HPICR_TREQ, dev->io + HP_ICR);
 296                 outb(inb(dev->io + HP_ICR) | HPICR_RREQ, dev->io + HP_ICR);
 297                 enable_irq(dev->irq);
 298                 msnd_init_queue(dev->DSPQ, dev->dspq_data_buff, dev->dspq_buff_size);
 299                 spin_unlock_irqrestore(&dev->lock, flags);
 300                 return 0;
 301         }
 302         spin_unlock_irqrestore(&dev->lock, flags);
 303
 304         printk(KERN_DEBUG LOGNAME ": Enable IRQ failed\n");
 305
 306         return -EIO;
 307 }
 308
 309 int msnd_disable_irq(multisound_dev_t *dev)
 310 {
 311         unsigned long flags;
 312
 313         if (--dev->irq_ref > 0)
 314                 return 0;
 315
 316         if (dev->irq_ref < 0)
 317                 printk(KERN_DEBUG LOGNAME ": IRQ ref count is %d\n", dev->irq_ref);
 318
 319         printk(KERN_DEBUG LOGNAME ": Disabling IRQ\n");
 320
 321         spin_lock_irqsave(&dev->lock, flags);
 322         if (msnd_wait_TXDE(dev) == 0) {
 323                 outb(inb(dev->io + HP_ICR) & ~HPICR_RREQ, dev->io + HP_ICR);
 324                 if (dev->type == msndClassic)
 325                         outb(HPIRQ_NONE, dev->io + HP_IRQM);
 326                 disable_irq(dev->irq);
 327                 spin_unlock_irqrestore(&dev->lock, flags);
 328                 return 0;
 329         }
 330         spin_unlock_irqrestore(&dev->lock, flags);
 331
 332         printk(KERN_DEBUG LOGNAME ": Disable IRQ failed\n");
 333
 334         return -EIO;
 335 }
 336
 337 #ifndef LINUX20
 338 EXPORT_SYMBOL(msnd_register);
 339 EXPORT_SYMBOL(msnd_unregister);
 340 EXPORT_SYMBOL(msnd_get_num_devs);
 341 EXPORT_SYMBOL(msnd_get_dev);
 342
 343 EXPORT_SYMBOL(msnd_init_queue);
 344
 345 EXPORT_SYMBOL(msnd_fifo_init);
 346 EXPORT_SYMBOL(msnd_fifo_free);
 347 EXPORT_SYMBOL(msnd_fifo_alloc);
 348 EXPORT_SYMBOL(msnd_fifo_make_empty);
 349 EXPORT_SYMBOL(msnd_fifo_write);
 350 EXPORT_SYMBOL(msnd_fifo_read);
 351
 352 EXPORT_SYMBOL(msnd_wait_TXDE);
 353 EXPORT_SYMBOL(msnd_wait_HC0);
 354 EXPORT_SYMBOL(msnd_send_dsp_cmd);
 355 EXPORT_SYMBOL(msnd_send_word);
 356 EXPORT_SYMBOL(msnd_upload_host);
 357
 358 EXPORT_SYMBOL(msnd_enable_irq);
 359 EXPORT_SYMBOL(msnd_disable_irq);
 360 #endif
 361
 362 #ifdef MODULE
 363 MODULE_AUTHOR                           ("Andrew Veliath <andrewtv@usa.net>");
 364 MODULE_DESCRIPTION                      ("Turtle Beach MultiSound Driver Base");
 365 MODULE_LICENSE("GPL");
 366
 367
 368 int init_module(void)
 369 {
 370         return 0;
 371 }
 372
 373 void cleanup_module(void)
 374 {
 375 }
 376 #endif