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-rw-r--r--arch/um/drivers/hostaudio_kern.c352
1 files changed, 352 insertions, 0 deletions
diff --git a/arch/um/drivers/hostaudio_kern.c b/arch/um/drivers/hostaudio_kern.c
new file mode 100644
index 000000000000..d5742783e19d
--- /dev/null
+++ b/arch/um/drivers/hostaudio_kern.c
@@ -0,0 +1,352 @@
+/*
+ * Copyright (C) 2002 Steve Schmidtke
+ * Licensed under the GPL
+ */
+
+#include "linux/config.h"
+#include "linux/module.h"
+#include "linux/init.h"
+#include "linux/slab.h"
+#include "linux/fs.h"
+#include "linux/sound.h"
+#include "linux/soundcard.h"
+#include "asm/uaccess.h"
+#include "kern_util.h"
+#include "init.h"
+#include "os.h"
+
+struct hostaudio_state {
+ int fd;
+};
+
+struct hostmixer_state {
+ int fd;
+};
+
+#define HOSTAUDIO_DEV_DSP "/dev/sound/dsp"
+#define HOSTAUDIO_DEV_MIXER "/dev/sound/mixer"
+
+/* Only changed from linux_main at boot time */
+char *dsp = HOSTAUDIO_DEV_DSP;
+char *mixer = HOSTAUDIO_DEV_MIXER;
+
+#define DSP_HELP \
+" This is used to specify the host dsp device to the hostaudio driver.\n" \
+" The default is \"" HOSTAUDIO_DEV_DSP "\".\n\n"
+
+#define MIXER_HELP \
+" This is used to specify the host mixer device to the hostaudio driver.\n"\
+" The default is \"" HOSTAUDIO_DEV_MIXER "\".\n\n"
+
+#ifndef MODULE
+static int set_dsp(char *name, int *add)
+{
+ dsp = name;
+ return(0);
+}
+
+__uml_setup("dsp=", set_dsp, "dsp=<dsp device>\n" DSP_HELP);
+
+static int set_mixer(char *name, int *add)
+{
+ mixer = name;
+ return(0);
+}
+
+__uml_setup("mixer=", set_mixer, "mixer=<mixer device>\n" MIXER_HELP);
+
+#else /*MODULE*/
+
+MODULE_PARM(dsp, "s");
+MODULE_PARM_DESC(dsp, DSP_HELP);
+
+MODULE_PARM(mixer, "s");
+MODULE_PARM_DESC(mixer, MIXER_HELP);
+
+#endif
+
+/* /dev/dsp file operations */
+
+static ssize_t hostaudio_read(struct file *file, char *buffer, size_t count,
+ loff_t *ppos)
+{
+ struct hostaudio_state *state = file->private_data;
+ void *kbuf;
+ int err;
+
+#ifdef DEBUG
+ printk("hostaudio: read called, count = %d\n", count);
+#endif
+
+ kbuf = kmalloc(count, GFP_KERNEL);
+ if(kbuf == NULL)
+ return(-ENOMEM);
+
+ err = os_read_file(state->fd, kbuf, count);
+ if(err < 0)
+ goto out;
+
+ if(copy_to_user(buffer, kbuf, err))
+ err = -EFAULT;
+
+ out:
+ kfree(kbuf);
+ return(err);
+}
+
+static ssize_t hostaudio_write(struct file *file, const char *buffer,
+ size_t count, loff_t *ppos)
+{
+ struct hostaudio_state *state = file->private_data;
+ void *kbuf;
+ int err;
+
+#ifdef DEBUG
+ printk("hostaudio: write called, count = %d\n", count);
+#endif
+
+ kbuf = kmalloc(count, GFP_KERNEL);
+ if(kbuf == NULL)
+ return(-ENOMEM);
+
+ err = -EFAULT;
+ if(copy_from_user(kbuf, buffer, count))
+ goto out;
+
+ err = os_write_file(state->fd, kbuf, count);
+ if(err < 0)
+ goto out;
+ *ppos += err;
+
+ out:
+ kfree(kbuf);
+ return(err);
+}
+
+static unsigned int hostaudio_poll(struct file *file,
+ struct poll_table_struct *wait)
+{
+ unsigned int mask = 0;
+
+#ifdef DEBUG
+ printk("hostaudio: poll called (unimplemented)\n");
+#endif
+
+ return(mask);
+}
+
+static int hostaudio_ioctl(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct hostaudio_state *state = file->private_data;
+ unsigned long data = 0;
+ int err;
+
+#ifdef DEBUG
+ printk("hostaudio: ioctl called, cmd = %u\n", cmd);
+#endif
+ switch(cmd){
+ case SNDCTL_DSP_SPEED:
+ case SNDCTL_DSP_STEREO:
+ case SNDCTL_DSP_GETBLKSIZE:
+ case SNDCTL_DSP_CHANNELS:
+ case SNDCTL_DSP_SUBDIVIDE:
+ case SNDCTL_DSP_SETFRAGMENT:
+ if(get_user(data, (int *) arg))
+ return(-EFAULT);
+ break;
+ default:
+ break;
+ }
+
+ err = os_ioctl_generic(state->fd, cmd, (unsigned long) &data);
+
+ switch(cmd){
+ case SNDCTL_DSP_SPEED:
+ case SNDCTL_DSP_STEREO:
+ case SNDCTL_DSP_GETBLKSIZE:
+ case SNDCTL_DSP_CHANNELS:
+ case SNDCTL_DSP_SUBDIVIDE:
+ case SNDCTL_DSP_SETFRAGMENT:
+ if(put_user(data, (int *) arg))
+ return(-EFAULT);
+ break;
+ default:
+ break;
+ }
+
+ return(err);
+}
+
+static int hostaudio_open(struct inode *inode, struct file *file)
+{
+ struct hostaudio_state *state;
+ int r = 0, w = 0;
+ int ret;
+
+#ifdef DEBUG
+ printk("hostaudio: open called (host: %s)\n", dsp);
+#endif
+
+ state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL);
+ if(state == NULL)
+ return(-ENOMEM);
+
+ if(file->f_mode & FMODE_READ) r = 1;
+ if(file->f_mode & FMODE_WRITE) w = 1;
+
+ ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
+ if(ret < 0){
+ kfree(state);
+ return(ret);
+ }
+
+ state->fd = ret;
+ file->private_data = state;
+ return(0);
+}
+
+static int hostaudio_release(struct inode *inode, struct file *file)
+{
+ struct hostaudio_state *state = file->private_data;
+
+#ifdef DEBUG
+ printk("hostaudio: release called\n");
+#endif
+
+ os_close_file(state->fd);
+ kfree(state);
+
+ return(0);
+}
+
+/* /dev/mixer file operations */
+
+static int hostmixer_ioctl_mixdev(struct inode *inode, struct file *file,
+ unsigned int cmd, unsigned long arg)
+{
+ struct hostmixer_state *state = file->private_data;
+
+#ifdef DEBUG
+ printk("hostmixer: ioctl called\n");
+#endif
+
+ return(os_ioctl_generic(state->fd, cmd, arg));
+}
+
+static int hostmixer_open_mixdev(struct inode *inode, struct file *file)
+{
+ struct hostmixer_state *state;
+ int r = 0, w = 0;
+ int ret;
+
+#ifdef DEBUG
+ printk("hostmixer: open called (host: %s)\n", mixer);
+#endif
+
+ state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL);
+ if(state == NULL) return(-ENOMEM);
+
+ if(file->f_mode & FMODE_READ) r = 1;
+ if(file->f_mode & FMODE_WRITE) w = 1;
+
+ ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0);
+
+ if(ret < 0){
+ printk("hostaudio_open_mixdev failed to open '%s', err = %d\n",
+ dsp, -ret);
+ kfree(state);
+ return(ret);
+ }
+
+ file->private_data = state;
+ return(0);
+}
+
+static int hostmixer_release(struct inode *inode, struct file *file)
+{
+ struct hostmixer_state *state = file->private_data;
+
+#ifdef DEBUG
+ printk("hostmixer: release called\n");
+#endif
+
+ os_close_file(state->fd);
+ kfree(state);
+
+ return(0);
+}
+
+
+/* kernel module operations */
+
+static struct file_operations hostaudio_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .read = hostaudio_read,
+ .write = hostaudio_write,
+ .poll = hostaudio_poll,
+ .ioctl = hostaudio_ioctl,
+ .mmap = NULL,
+ .open = hostaudio_open,
+ .release = hostaudio_release,
+};
+
+static struct file_operations hostmixer_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .ioctl = hostmixer_ioctl_mixdev,
+ .open = hostmixer_open_mixdev,
+ .release = hostmixer_release,
+};
+
+struct {
+ int dev_audio;
+ int dev_mixer;
+} module_data;
+
+MODULE_AUTHOR("Steve Schmidtke");
+MODULE_DESCRIPTION("UML Audio Relay");
+MODULE_LICENSE("GPL");
+
+static int __init hostaudio_init_module(void)
+{
+ printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n",
+ dsp, mixer);
+
+ module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1);
+ if(module_data.dev_audio < 0){
+ printk(KERN_ERR "hostaudio: couldn't register DSP device!\n");
+ return -ENODEV;
+ }
+
+ module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1);
+ if(module_data.dev_mixer < 0){
+ printk(KERN_ERR "hostmixer: couldn't register mixer "
+ "device!\n");
+ unregister_sound_dsp(module_data.dev_audio);
+ return -ENODEV;
+ }
+
+ return 0;
+}
+
+static void __exit hostaudio_cleanup_module (void)
+{
+ unregister_sound_mixer(module_data.dev_mixer);
+ unregister_sound_dsp(module_data.dev_audio);
+}
+
+module_init(hostaudio_init_module);
+module_exit(hostaudio_cleanup_module);
+
+/*
+ * Overrides for Emacs so that we follow Linus's tabbing style.
+ * Emacs will notice this stuff at the end of the file and automatically
+ * adjust the settings for this buffer only. This must remain at the end
+ * of the file.
+ * ---------------------------------------------------------------------------
+ * Local variables:
+ * c-file-style: "linux"
+ * End:
+ */
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.