136 lines
3.7 KiB
C
136 lines
3.7 KiB
C
/*
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* Copyright (c) by Jaroslav Kysela <perex@suse.cz>
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* GUS's memory access via proc filesystem
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <sound/driver.h>
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#include <linux/slab.h>
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#include <sound/core.h>
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#include <sound/gus.h>
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#include <sound/info.h>
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typedef struct gus_proc_private {
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int rom; /* data are in ROM */
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unsigned int address;
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unsigned int size;
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snd_gus_card_t * gus;
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} gus_proc_private_t;
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static long snd_gf1_mem_proc_dump(snd_info_entry_t *entry, void *file_private_data,
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struct file *file, char __user *buf,
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unsigned long count, unsigned long pos)
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{
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long size;
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gus_proc_private_t *priv = entry->private_data;
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snd_gus_card_t *gus = priv->gus;
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int err;
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size = count;
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if (pos + size > priv->size)
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size = (long)priv->size - pos;
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if (size > 0) {
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if ((err = snd_gus_dram_read(gus, buf, pos, size, priv->rom)) < 0)
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return err;
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return size;
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}
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return 0;
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}
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static long long snd_gf1_mem_proc_llseek(snd_info_entry_t *entry,
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void *private_file_data,
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struct file *file,
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long long offset,
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int orig)
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{
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gus_proc_private_t *priv = entry->private_data;
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switch (orig) {
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case 0: /* SEEK_SET */
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file->f_pos = offset;
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break;
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case 1: /* SEEK_CUR */
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file->f_pos += offset;
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break;
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case 2: /* SEEK_END, offset is negative */
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file->f_pos = priv->size + offset;
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break;
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default:
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return -EINVAL;
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}
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if (file->f_pos > priv->size)
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file->f_pos = priv->size;
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return file->f_pos;
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}
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static void snd_gf1_mem_proc_free(snd_info_entry_t *entry)
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{
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gus_proc_private_t *priv = entry->private_data;
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kfree(priv);
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}
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static struct snd_info_entry_ops snd_gf1_mem_proc_ops = {
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.read = snd_gf1_mem_proc_dump,
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.llseek = snd_gf1_mem_proc_llseek,
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};
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int snd_gf1_mem_proc_init(snd_gus_card_t * gus)
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{
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int idx;
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char name[16];
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gus_proc_private_t *priv;
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snd_info_entry_t *entry;
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for (idx = 0; idx < 4; idx++) {
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if (gus->gf1.mem_alloc.banks_8[idx].size > 0) {
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priv = kcalloc(1, sizeof(*priv), GFP_KERNEL);
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if (priv == NULL)
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return -ENOMEM;
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priv->gus = gus;
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sprintf(name, "gus-ram-%i", idx);
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if (! snd_card_proc_new(gus->card, name, &entry)) {
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entry->content = SNDRV_INFO_CONTENT_DATA;
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entry->private_data = priv;
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entry->private_free = snd_gf1_mem_proc_free;
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entry->c.ops = &snd_gf1_mem_proc_ops;
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priv->address = gus->gf1.mem_alloc.banks_8[idx].address;
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priv->size = entry->size = gus->gf1.mem_alloc.banks_8[idx].size;
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}
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}
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}
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for (idx = 0; idx < 4; idx++) {
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if (gus->gf1.rom_present & (1 << idx)) {
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priv = kcalloc(1, sizeof(*priv), GFP_KERNEL);
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if (priv == NULL)
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return -ENOMEM;
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priv->rom = 1;
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priv->gus = gus;
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sprintf(name, "gus-rom-%i", idx);
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if (! snd_card_proc_new(gus->card, name, &entry)) {
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entry->content = SNDRV_INFO_CONTENT_DATA;
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entry->private_data = priv;
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entry->private_free = snd_gf1_mem_proc_free;
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entry->c.ops = &snd_gf1_mem_proc_ops;
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priv->address = idx * 4096 * 1024;
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priv->size = entry->size = gus->gf1.rom_memory;
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}
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}
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}
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return 0;
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}
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