113 lines
2.7 KiB
C
113 lines
2.7 KiB
C
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Functions for the OPL4 proc file
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* Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
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*/
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#include "opl4_local.h"
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#include <linux/vmalloc.h>
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#include <linux/export.h>
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#include <sound/info.h>
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static int snd_opl4_mem_proc_open(struct snd_info_entry *entry,
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unsigned short mode, void **file_private_data)
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{
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struct snd_opl4 *opl4 = entry->private_data;
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mutex_lock(&opl4->access_mutex);
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if (opl4->memory_access) {
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mutex_unlock(&opl4->access_mutex);
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return -EBUSY;
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}
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opl4->memory_access++;
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mutex_unlock(&opl4->access_mutex);
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return 0;
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}
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static int snd_opl4_mem_proc_release(struct snd_info_entry *entry,
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unsigned short mode, void *file_private_data)
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{
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struct snd_opl4 *opl4 = entry->private_data;
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mutex_lock(&opl4->access_mutex);
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opl4->memory_access--;
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mutex_unlock(&opl4->access_mutex);
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return 0;
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}
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static ssize_t snd_opl4_mem_proc_read(struct snd_info_entry *entry,
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void *file_private_data,
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struct file *file, char __user *_buf,
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size_t count, loff_t pos)
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{
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struct snd_opl4 *opl4 = entry->private_data;
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char* buf;
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buf = vmalloc(count);
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if (!buf)
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return -ENOMEM;
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snd_opl4_read_memory(opl4, buf, pos, count);
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if (copy_to_user(_buf, buf, count)) {
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vfree(buf);
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return -EFAULT;
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}
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vfree(buf);
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return count;
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}
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static ssize_t snd_opl4_mem_proc_write(struct snd_info_entry *entry,
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void *file_private_data,
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struct file *file,
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const char __user *_buf,
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size_t count, loff_t pos)
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{
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struct snd_opl4 *opl4 = entry->private_data;
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char *buf;
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buf = vmalloc(count);
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if (!buf)
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return -ENOMEM;
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if (copy_from_user(buf, _buf, count)) {
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vfree(buf);
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return -EFAULT;
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}
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snd_opl4_write_memory(opl4, buf, pos, count);
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vfree(buf);
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return count;
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}
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static const struct snd_info_entry_ops snd_opl4_mem_proc_ops = {
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.open = snd_opl4_mem_proc_open,
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.release = snd_opl4_mem_proc_release,
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.read = snd_opl4_mem_proc_read,
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.write = snd_opl4_mem_proc_write,
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};
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int snd_opl4_create_proc(struct snd_opl4 *opl4)
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{
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struct snd_info_entry *entry;
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entry = snd_info_create_card_entry(opl4->card, "opl4-mem", opl4->card->proc_root);
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if (entry) {
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if (opl4->hardware < OPL3_HW_OPL4_ML) {
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/* OPL4 can access 4 MB external ROM/SRAM */
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entry->mode |= 0200;
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entry->size = 4 * 1024 * 1024;
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} else {
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/* OPL4-ML has 1 MB internal ROM */
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entry->size = 1 * 1024 * 1024;
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}
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entry->content = SNDRV_INFO_CONTENT_DATA;
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entry->c.ops = &snd_opl4_mem_proc_ops;
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entry->module = THIS_MODULE;
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entry->private_data = opl4;
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}
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opl4->proc_entry = entry;
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return 0;
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}
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void snd_opl4_free_proc(struct snd_opl4 *opl4)
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{
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snd_info_free_entry(opl4->proc_entry);
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}
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