1 files changed, 353 insertions, 0 deletions
diff --git a/arch/um/drivers/hostaudio_kern.c b/arch/um/drivers/hostaudio_kern.c
new file mode 100644
index 000000000..5b064d360
--- /dev/null
+++ b/arch/um/drivers/hostaudio_kern.c
@@ -0,0 +1,353 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (C) 2002 Steve Schmidtke
+ */
+
+#include <linux/fs.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/sound.h>
+#include <linux/soundcard.h>
+#include <linux/mutex.h>
+#include <linux/uaccess.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"
+
+/*
+ * Changed either at boot time or module load time.  At boot, this is
+ * single-threaded; at module load, multiple modules would each have
+ * their own copy of these variables.
+ */
+static char *dsp = HOSTAUDIO_DEV_DSP;
+static 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"
+
+module_param(dsp, charp, 0644);
+MODULE_PARM_DESC(dsp, DSP_HELP);
+module_param(mixer, charp, 0644);
+MODULE_PARM_DESC(mixer, MIXER_HELP);
+
+#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);
+#endif
+
+static DEFINE_MUTEX(hostaudio_mutex);
+
+/* /dev/dsp file operations */
+
+static ssize_t hostaudio_read(struct file *file, char __user *buffer,
+			      size_t count, loff_t *ppos)
+{
+	struct hostaudio_state *state = file->private_data;
+	void *kbuf;
+	int err;
+
+#ifdef DEBUG
+	printk(KERN_DEBUG "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 __user *buffer,
+			       size_t count, loff_t *ppos)
+{
+	struct hostaudio_state *state = file->private_data;
+	void *kbuf;
+	int err;
+
+#ifdef DEBUG
+	printk(KERN_DEBUG "hostaudio: write called, count = %d\n", count);
+#endif
+
+	kbuf = memdup_user(buffer, count);
+	if (IS_ERR(kbuf))
+		return PTR_ERR(kbuf);
+
+	err = os_write_file(state->fd, kbuf, count);
+	if (err < 0)
+		goto out;
+	*ppos += err;
+
+ out:
+	kfree(kbuf);
+	return err;
+}
+
+static __poll_t hostaudio_poll(struct file *file,
+				struct poll_table_struct *wait)
+{
+#ifdef DEBUG
+	printk(KERN_DEBUG "hostaudio: poll called (unimplemented)\n");
+#endif
+
+	return 0;
+}
+
+static long hostaudio_ioctl(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(KERN_DEBUG "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 __user *) 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 __user *) 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
+	kernel_param_lock(THIS_MODULE);
+	printk(KERN_DEBUG "hostaudio: open called (host: %s)\n", dsp);
+	kernel_param_unlock(THIS_MODULE);
+#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;
+
+	kernel_param_lock(THIS_MODULE);
+	mutex_lock(&hostaudio_mutex);
+	ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
+	mutex_unlock(&hostaudio_mutex);
+	kernel_param_unlock(THIS_MODULE);
+
+	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(KERN_DEBUG "hostaudio: release called\n");
+#endif
+	os_close_file(state->fd);
+	kfree(state);
+
+	return 0;
+}
+
+/* /dev/mixer file operations */
+
+static long hostmixer_ioctl_mixdev(struct file *file,
+				  unsigned int cmd, unsigned long arg)
+{
+	struct hostmixer_state *state = file->private_data;
+
+#ifdef DEBUG
+	printk(KERN_DEBUG "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(KERN_DEBUG "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;
+
+	kernel_param_lock(THIS_MODULE);
+	mutex_lock(&hostaudio_mutex);
+	ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0);
+	mutex_unlock(&hostaudio_mutex);
+	kernel_param_unlock(THIS_MODULE);
+
+	if (ret < 0) {
+		kernel_param_lock(THIS_MODULE);
+		printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', "
+		       "err = %d\n", dsp, -ret);
+		kernel_param_unlock(THIS_MODULE);
+		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(KERN_DEBUG "hostmixer: release called\n");
+#endif
+
+	os_close_file(state->fd);
+	kfree(state);
+
+	return 0;
+}
+
+/* kernel module operations */
+
+static const struct file_operations hostaudio_fops = {
+	.owner          = THIS_MODULE,
+	.llseek         = no_llseek,
+	.read           = hostaudio_read,
+	.write          = hostaudio_write,
+	.poll           = hostaudio_poll,
+	.unlocked_ioctl	= hostaudio_ioctl,
+	.compat_ioctl	= compat_ptr_ioctl,
+	.mmap           = NULL,
+	.open           = hostaudio_open,
+	.release        = hostaudio_release,
+};
+
+static const struct file_operations hostmixer_fops = {
+	.owner          = THIS_MODULE,
+	.llseek         = no_llseek,
+	.unlocked_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)
+{
+	kernel_param_lock(THIS_MODULE);
+	printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n",
+	       dsp, mixer);
+	kernel_param_unlock(THIS_MODULE);
+
+	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);