sound/drivers/opl4/opl4_proc.c

   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Functions for the OPL4 proc file
   4  * Copyright (c) 2003 by Clemens Ladisch <clemens@ladisch.de>
   5  */
   6
   7 #include "opl4_local.h"
   8 #include <linux/vmalloc.h>
   9 #include <linux/export.h>
  10 #include <sound/info.h>
  11
  12 static int snd_opl4_mem_proc_open(struct snd_info_entry *entry,
  13                                   unsigned short mode, void **file_private_data)
  14 {
  15         struct snd_opl4 *opl4 = entry->private_data;
  16
  17         mutex_lock(&opl4->access_mutex);
  18         if (opl4->memory_access) {
  19                 mutex_unlock(&opl4->access_mutex);
  20                 return -EBUSY;
  21         }
  22         opl4->memory_access++;
  23         mutex_unlock(&opl4->access_mutex);
  24         return 0;
  25 }
  26
  27 static int snd_opl4_mem_proc_release(struct snd_info_entry *entry,
  28                                      unsigned short mode, void *file_private_data)
  29 {
  30         struct snd_opl4 *opl4 = entry->private_data;
  31
  32         mutex_lock(&opl4->access_mutex);
  33         opl4->memory_access--;
  34         mutex_unlock(&opl4->access_mutex);
  35         return 0;
  36 }
  37
  38 static ssize_t snd_opl4_mem_proc_read(struct snd_info_entry *entry,
  39                                       void *file_private_data,
  40                                       struct file *file, char __user *_buf,
  41                                       size_t count, loff_t pos)
  42 {
  43         struct snd_opl4 *opl4 = entry->private_data;
  44         char* buf;
  45
  46         buf = vmalloc(count);
  47         if (!buf)
  48                 return -ENOMEM;
  49         snd_opl4_read_memory(opl4, buf, pos, count);
  50         if (copy_to_user(_buf, buf, count)) {
  51                 vfree(buf);
  52                 return -EFAULT;
  53         }
  54         vfree(buf);
  55         return count;
  56 }
  57
  58 static ssize_t snd_opl4_mem_proc_write(struct snd_info_entry *entry,
  59                                        void *file_private_data,
  60                                        struct file *file,
  61                                        const char __user *_buf,
  62                                        size_t count, loff_t pos)
  63 {
  64         struct snd_opl4 *opl4 = entry->private_data;
  65         char *buf;
  66
  67         buf = vmalloc(count);
  68         if (!buf)
  69                 return -ENOMEM;
  70         if (copy_from_user(buf, _buf, count)) {
  71                 vfree(buf);
  72                 return -EFAULT;
  73         }
  74         snd_opl4_write_memory(opl4, buf, pos, count);
  75         vfree(buf);
  76         return count;
  77 }
  78
  79 static const struct snd_info_entry_ops snd_opl4_mem_proc_ops = {
  80         .open = snd_opl4_mem_proc_open,
  81         .release = snd_opl4_mem_proc_release,
  82         .read = snd_opl4_mem_proc_read,
  83         .write = snd_opl4_mem_proc_write,
  84 };
  85
  86 int snd_opl4_create_proc(struct snd_opl4 *opl4)
  87 {
  88         struct snd_info_entry *entry;
  89
  90         entry = snd_info_create_card_entry(opl4->card, "opl4-mem", opl4->card->proc_root);
  91         if (entry) {
  92                 if (opl4->hardware < OPL3_HW_OPL4_ML) {
  93                         /* OPL4 can access 4 MB external ROM/SRAM */
  94                         entry->mode |= 0200;
  95                         entry->size = 4 * 1024 * 1024;
  96                 } else {
  97                         /* OPL4-ML has 1 MB internal ROM */
  98                         entry->size = 1 * 1024 * 1024;
  99                 }
 100                 entry->content = SNDRV_INFO_CONTENT_DATA;
 101                 entry->c.ops = &snd_opl4_mem_proc_ops;
 102                 entry->module = THIS_MODULE;
 103                 entry->private_data = opl4;
 104         }
 105         opl4->proc_entry = entry;
 106         return 0;
 107 }
 108
 109 void snd_opl4_free_proc(struct snd_opl4 *opl4)
 110 {
 111         snd_info_free_entry(opl4->proc_entry);
 112 }