1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) by Jaroslav Kysela <perex@perex.cz>
4 * GUS's memory access via proc filesystem
5 */
6
7#include <linux/slab.h>
8#include <sound/core.h>
9#include <sound/gus.h>
10#include <sound/info.h>
11
12struct gus_proc_private {
13 int rom; /* data are in ROM */
14 unsigned int address;
15 unsigned int size;
16 struct snd_gus_card * gus;
17};
18
19static ssize_t snd_gf1_mem_proc_dump(struct snd_info_entry *entry,
20 void *file_private_data,
21 struct file *file, char __user *buf,
22 size_t count, loff_t pos)
23{
24 struct gus_proc_private *priv = entry->private_data;
25 struct snd_gus_card *gus = priv->gus;
26 int err;
27
28 err = snd_gus_dram_read(gus, ptr: buf, addr: pos, size: count, rom: priv->rom);
29 if (err < 0)
30 return err;
31 return count;
32}
33
34static void snd_gf1_mem_proc_free(struct snd_info_entry *entry)
35{
36 struct gus_proc_private *priv = entry->private_data;
37 kfree(objp: priv);
38}
39
40static const struct snd_info_entry_ops snd_gf1_mem_proc_ops = {
41 .read = snd_gf1_mem_proc_dump,
42};
43
44int snd_gf1_mem_proc_init(struct snd_gus_card * gus)
45{
46 int idx;
47 char name[16];
48 struct gus_proc_private *priv;
49 struct snd_info_entry *entry;
50
51 for (idx = 0; idx < 4; idx++) {
52 if (gus->gf1.mem_alloc.banks_8[idx].size > 0) {
53 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
54 if (priv == NULL)
55 return -ENOMEM;
56 priv->gus = gus;
57 sprintf(buf: name, fmt: "gus-ram-%i", idx);
58 if (! snd_card_proc_new(card: gus->card, name, entryp: &entry)) {
59 entry->content = SNDRV_INFO_CONTENT_DATA;
60 entry->private_data = priv;
61 entry->private_free = snd_gf1_mem_proc_free;
62 entry->c.ops = &snd_gf1_mem_proc_ops;
63 priv->address = gus->gf1.mem_alloc.banks_8[idx].address;
64 priv->size = entry->size = gus->gf1.mem_alloc.banks_8[idx].size;
65 }
66 }
67 }
68 for (idx = 0; idx < 4; idx++) {
69 if (gus->gf1.rom_present & (1 << idx)) {
70 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
71 if (priv == NULL)
72 return -ENOMEM;
73 priv->rom = 1;
74 priv->gus = gus;
75 sprintf(buf: name, fmt: "gus-rom-%i", idx);
76 if (! snd_card_proc_new(card: gus->card, name, entryp: &entry)) {
77 entry->content = SNDRV_INFO_CONTENT_DATA;
78 entry->private_data = priv;
79 entry->private_free = snd_gf1_mem_proc_free;
80 entry->c.ops = &snd_gf1_mem_proc_ops;
81 priv->address = idx * 4096 * 1024;
82 priv->size = entry->size = gus->gf1.rom_memory;
83 }
84 }
85 }
86 return 0;
87}
88

source code of linux/sound/isa/gus/gus_mem_proc.c