arch/um/drivers/hostaudio_kern.c - linux - Git at Google

 /*
  * Copyright (C) 2002 Steve Schmidtke
  * Licensed under the GPL
  */

 #include "linux/fs.h"
 #include "linux/module.h"
 #include "linux/slab.h"
 #include "linux/sound.h"
 #include "linux/soundcard.h"
 #include "linux/smp_lock.h"
 #include "asm/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"

 #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_param(dsp, charp, 0644);
 MODULE_PARM_DESC(dsp, DSP_HELP);

 module_param(mixer, charp, 0644);
 MODULE_PARM_DESC(mixer, MIXER_HELP);

 #endif

 /* /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 = 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(KERN_DEBUG "hostaudio: poll called (unimplemented)\n");
 #endif

 	return mask;
 }

 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
 	kparam_block_sysfs_write(dsp);
 	printk(KERN_DEBUG "hostaudio: open called (host: %s)\n", dsp);
 	kparam_unblock_sysfs_write(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;

 	kparam_block_sysfs_write(dsp);
 	lock_kernel();
 	ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
 	unlock_kernel();
 	kparam_unblock_sysfs_write(dsp);

 	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;

 	kparam_block_sysfs_write(mixer);
 	lock_kernel();
 	ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0);
 	unlock_kernel();
 	kparam_unblock_sysfs_write(mixer);

 	if (ret < 0) {
 		kparam_block_sysfs_write(dsp);
 		printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', "
 		       "err = %d\n", dsp, -ret);
 		kparam_unblock_sysfs_write(dsp);
 		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,
 	.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();
 	printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n",
 	       dsp, mixer);
 	__kernel_param_unlock();

 	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);
	/*
	* Copyright (C) 2002 Steve Schmidtke
	* Licensed under the GPL
	*/

	#include "linux/fs.h"
	#include "linux/module.h"
	#include "linux/slab.h"
	#include "linux/sound.h"
	#include "linux/soundcard.h"
	#include "linux/smp_lock.h"
	#include "asm/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"

	#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_param(dsp, charp, 0644);
	MODULE_PARM_DESC(dsp, DSP_HELP);

	module_param(mixer, charp, 0644);
	MODULE_PARM_DESC(mixer, MIXER_HELP);

	#endif

	/* /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 = 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(KERN_DEBUG "hostaudio: poll called (unimplemented)\n");
	#endif

	return mask;
	}

	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
	kparam_block_sysfs_write(dsp);
	printk(KERN_DEBUG "hostaudio: open called (host: %s)\n", dsp);
	kparam_unblock_sysfs_write(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;

	kparam_block_sysfs_write(dsp);
	lock_kernel();
	ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
	unlock_kernel();
	kparam_unblock_sysfs_write(dsp);

	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;

	kparam_block_sysfs_write(mixer);
	lock_kernel();
	ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0);
	unlock_kernel();
	kparam_unblock_sysfs_write(mixer);

	if (ret < 0) {
	kparam_block_sysfs_write(dsp);
	printk(KERN_ERR "hostaudio_open_mixdev failed to open '%s', "
	"err = %d\n", dsp, -ret);
	kparam_unblock_sysfs_write(dsp);
	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,
	.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();
	printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n",
	dsp, mixer);
	__kernel_param_unlock();

	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);