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https://github.com/torvalds/linux
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73029e0ff1
The llseek implementation is identical for existing driver implementations, so let's merge to the common layer. The same code for the text proc file can be used even for the binary proc file. The driver can provide its own llseek method if needed. Then the common code will be skipped. Signed-off-by: Takashi Iwai <tiwai@suse.de>
133 lines
3.4 KiB
C
133 lines
3.4 KiB
C
/*
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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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* 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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#include "opl4_local.h"
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#include <linux/vmalloc.h>
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#include <sound/info.h>
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#ifdef CONFIG_PROC_FS
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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, size_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 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 |= S_IWUSR;
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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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if (snd_info_register(entry) < 0) {
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snd_info_free_entry(entry);
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entry = NULL;
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}
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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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#endif /* CONFIG_PROC_FS */
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