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 guard(mutex)(&opl4->access_mutex); 18 if (opl4->memory_access) 19 return -EBUSY; 20 opl4->memory_access++; 21 return 0; 22 } 23 24 static int snd_opl4_mem_proc_release(struct snd_info_entry *entry, 25 unsigned short mode, void *file_private_data) 26 { 27 struct snd_opl4 *opl4 = entry->private_data; 28 29 guard(mutex)(&opl4->access_mutex); 30 opl4->memory_access--; 31 return 0; 32 } 33 34 static ssize_t snd_opl4_mem_proc_read(struct snd_info_entry *entry, 35 void *file_private_data, 36 struct file *file, char __user *_buf, 37 size_t count, loff_t pos) 38 { 39 struct snd_opl4 *opl4 = entry->private_data; 40 char* buf; 41 42 buf = vmalloc(count); 43 if (!buf) 44 return -ENOMEM; 45 snd_opl4_read_memory(opl4, buf, pos, count); 46 if (copy_to_user(_buf, buf, count)) { 47 vfree(buf); 48 return -EFAULT; 49 } 50 vfree(buf); 51 return count; 52 } 53 54 static ssize_t snd_opl4_mem_proc_write(struct snd_info_entry *entry, 55 void *file_private_data, 56 struct file *file, 57 const char __user *_buf, 58 size_t count, loff_t pos) 59 { 60 struct snd_opl4 *opl4 = entry->private_data; 61 char *buf; 62 63 buf = vmalloc(count); 64 if (!buf) 65 return -ENOMEM; 66 if (copy_from_user(buf, _buf, count)) { 67 vfree(buf); 68 return -EFAULT; 69 } 70 snd_opl4_write_memory(opl4, buf, pos, count); 71 vfree(buf); 72 return count; 73 } 74 75 static const struct snd_info_entry_ops snd_opl4_mem_proc_ops = { 76 .open = snd_opl4_mem_proc_open, 77 .release = snd_opl4_mem_proc_release, 78 .read = snd_opl4_mem_proc_read, 79 .write = snd_opl4_mem_proc_write, 80 }; 81 82 int snd_opl4_create_proc(struct snd_opl4 *opl4) 83 { 84 struct snd_info_entry *entry; 85 86 entry = snd_info_create_card_entry(opl4->card, "opl4-mem", opl4->card->proc_root); 87 if (entry) { 88 if (opl4->hardware < OPL3_HW_OPL4_ML) { 89 /* OPL4 can access 4 MB external ROM/SRAM */ 90 entry->mode |= 0200; 91 entry->size = 4 * 1024 * 1024; 92 } else { 93 /* OPL4-ML has 1 MB internal ROM */ 94 entry->size = 1 * 1024 * 1024; 95 } 96 entry->content = SNDRV_INFO_CONTENT_DATA; 97 entry->c.ops = &snd_opl4_mem_proc_ops; 98 entry->module = THIS_MODULE; 99 entry->private_data = opl4; 100 } 101 opl4->proc_entry = entry; 102 return 0; 103 } 104 105 void snd_opl4_free_proc(struct snd_opl4 *opl4) 106 { 107 snd_info_free_entry(opl4->proc_entry); 108 } 109