diff options
Diffstat (limited to 'sound/isa/gus/gus_mem_proc.c')
| -rw-r--r-- | sound/isa/gus/gus_mem_proc.c | 135 |
1 files changed, 135 insertions, 0 deletions
diff --git a/sound/isa/gus/gus_mem_proc.c b/sound/isa/gus/gus_mem_proc.c new file mode 100644 index 00000000000..886763f1213 --- /dev/null +++ b/sound/isa/gus/gus_mem_proc.c @@ -0,0 +1,135 @@ +/* + * Copyright (c) by Jaroslav Kysela <perex@suse.cz> + * GUS's memory access via proc filesystem + * + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, + * but WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + * GNU General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + */ + +#include <sound/driver.h> +#include <linux/slab.h> +#include <sound/core.h> +#include <sound/gus.h> +#include <sound/info.h> + +typedef struct gus_proc_private { + int rom; /* data are in ROM */ + unsigned int address; + unsigned int size; + snd_gus_card_t * gus; +} gus_proc_private_t; + +static long snd_gf1_mem_proc_dump(snd_info_entry_t *entry, void *file_private_data, + struct file *file, char __user *buf, + unsigned long count, unsigned long pos) +{ + long size; + gus_proc_private_t *priv = entry->private_data; + snd_gus_card_t *gus = priv->gus; + int err; + + size = count; + if (pos + size > priv->size) + size = (long)priv->size - pos; + if (size > 0) { + if ((err = snd_gus_dram_read(gus, buf, pos, size, priv->rom)) < 0) + return err; + return size; + } + return 0; +} + +static long long snd_gf1_mem_proc_llseek(snd_info_entry_t *entry, + void *private_file_data, + struct file *file, + long long offset, + int orig) +{ + gus_proc_private_t *priv = entry->private_data; + + switch (orig) { + case 0: /* SEEK_SET */ + file->f_pos = offset; + break; + case 1: /* SEEK_CUR */ + file->f_pos += offset; + break; + case 2: /* SEEK_END, offset is negative */ + file->f_pos = priv->size + offset; + break; + default: + return -EINVAL; + } + if (file->f_pos > priv->size) + file->f_pos = priv->size; + return file->f_pos; +} + +static void snd_gf1_mem_proc_free(snd_info_entry_t *entry) +{ + gus_proc_private_t *priv = entry->private_data; + kfree(priv); +} + +static struct snd_info_entry_ops snd_gf1_mem_proc_ops = { + .read = snd_gf1_mem_proc_dump, + .llseek = snd_gf1_mem_proc_llseek, +}; + +int snd_gf1_mem_proc_init(snd_gus_card_t * gus) +{ + int idx; + char name[16]; + gus_proc_private_t *priv; + snd_info_entry_t *entry; + + for (idx = 0; idx < 4; idx++) { + if (gus->gf1.mem_alloc.banks_8[idx].size > 0) { + priv = kcalloc(1, sizeof(*priv), GFP_KERNEL); + if (priv == NULL) + return -ENOMEM; + priv->gus = gus; + sprintf(name, "gus-ram-%i", idx); + if (! snd_card_proc_new(gus->card, name, &entry)) { + entry->content = SNDRV_INFO_CONTENT_DATA; + entry->private_data = priv; + entry->private_free = snd_gf1_mem_proc_free; + entry->c.ops = &snd_gf1_mem_proc_ops; + priv->address = gus->gf1.mem_alloc.banks_8[idx].address; + priv->size = entry->size = gus->gf1.mem_alloc.banks_8[idx].size; + } + } + } + for (idx = 0; idx < 4; idx++) { + if (gus->gf1.rom_present & (1 << idx)) { + priv = kcalloc(1, sizeof(*priv), GFP_KERNEL); + if (priv == NULL) + return -ENOMEM; + priv->rom = 1; + priv->gus = gus; + sprintf(name, "gus-rom-%i", idx); + if (! snd_card_proc_new(gus->card, name, &entry)) { + entry->content = SNDRV_INFO_CONTENT_DATA; + entry->private_data = priv; + entry->private_free = snd_gf1_mem_proc_free; + entry->c.ops = &snd_gf1_mem_proc_ops; + priv->address = idx * 4096 * 1024; + priv->size = entry->size = gus->gf1.rom_memory; + } + } + } + return 0; +} |