[mirror_ubuntu-jammy-kernel.git] / arch / um / drivers / hostaudio_kern.c

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

#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_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("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("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 __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
        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 const 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 const 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:
 */
Commit	Line	Data
1da177e4 LT	1	/*
	2	* Copyright (C) 2002 Steve Schmidtke
	3	* Licensed under the GPL
	4	*/
	5
1da177e4 LT	6	#include "linux/module.h"
	7	#include "linux/init.h"
	8	#include "linux/slab.h"
	9	#include "linux/fs.h"
	10	#include "linux/sound.h"
	11	#include "linux/soundcard.h"
	12	#include "asm/uaccess.h"
	13	#include "kern_util.h"
	14	#include "init.h"
	15	#include "os.h"
	16
	17	struct hostaudio_state {
	18	int fd;
	19	};
	20
	21	struct hostmixer_state {
	22	int fd;
	23	};
	24
	25	#define HOSTAUDIO_DEV_DSP "/dev/sound/dsp"
	26	#define HOSTAUDIO_DEV_MIXER "/dev/sound/mixer"
	27
	28	/* Only changed from linux_main at boot time */
	29	char *dsp = HOSTAUDIO_DEV_DSP;
	30	char *mixer = HOSTAUDIO_DEV_MIXER;
	31
	32	#define DSP_HELP \
	33	" This is used to specify the host dsp device to the hostaudio driver.\n" \
	34	" The default is \"" HOSTAUDIO_DEV_DSP "\".\n\n"
	35
	36	#define MIXER_HELP \
	37	" This is used to specify the host mixer device to the hostaudio driver.\n"\
	38	" The default is \"" HOSTAUDIO_DEV_MIXER "\".\n\n"
	39
	40	#ifndef MODULE
	41	static int set_dsp(char name, int add)
	42	{
	43	dsp = name;
	44	return(0);
	45	}
	46
	47	__uml_setup("dsp=", set_dsp, "dsp=<dsp device>\n" DSP_HELP);
	48
	49	static int set_mixer(char name, int add)
	50	{
	51	mixer = name;
	52	return(0);
	53	}
	54
	55	__uml_setup("mixer=", set_mixer, "mixer=<mixer device>\n" MIXER_HELP);
	56
	57	#else /MODULE/
	58
20a64f1d	59	module_param(dsp, charp, 0644);
1da177e4 LT	60	MODULE_PARM_DESC(dsp, DSP_HELP);
1da177e4 LT	61
20a64f1d	62	module_param(mixer, charp, 0644);
1da177e4 LT	63	MODULE_PARM_DESC(mixer, MIXER_HELP);
	64
	65	#endif
	66
	67	/* /dev/dsp file operations */
	68
4d338e1a AV	69	static ssize_t hostaudio_read(struct file file, char __user buffer,
4d338e1a AV	70	size_t count, loff_t *ppos)
1da177e4 LT	71	{
	72	struct hostaudio_state *state = file->private_data;
	73	void *kbuf;
	74	int err;
	75
	76	#ifdef DEBUG
	77	printk("hostaudio: read called, count = %d\n", count);
	78	#endif
	79
	80	kbuf = kmalloc(count, GFP_KERNEL);
	81	if(kbuf == NULL)
	82	return(-ENOMEM);
	83
	84	err = os_read_file(state->fd, kbuf, count);
	85	if(err < 0)
	86	goto out;
	87
	88	if(copy_to_user(buffer, kbuf, err))
	89	err = -EFAULT;
	90
	91	out:
	92	kfree(kbuf);
	93	return(err);
	94	}
	95
4d338e1a	96	static ssize_t hostaudio_write(struct file file, const char __user buffer,
1da177e4 LT	97	size_t count, loff_t *ppos)
	98	{
	99	struct hostaudio_state *state = file->private_data;
	100	void *kbuf;
	101	int err;
	102
	103	#ifdef DEBUG
	104	printk("hostaudio: write called, count = %d\n", count);
	105	#endif
	106
	107	kbuf = kmalloc(count, GFP_KERNEL);
	108	if(kbuf == NULL)
	109	return(-ENOMEM);
	110
	111	err = -EFAULT;
	112	if(copy_from_user(kbuf, buffer, count))
	113	goto out;
	114
	115	err = os_write_file(state->fd, kbuf, count);
	116	if(err < 0)
	117	goto out;
	118	*ppos += err;
	119
	120	out:
	121	kfree(kbuf);
	122	return(err);
	123	}
	124
	125	static unsigned int hostaudio_poll(struct file *file,
	126	struct poll_table_struct *wait)
	127	{
	128	unsigned int mask = 0;
	129
	130	#ifdef DEBUG
	131	printk("hostaudio: poll called (unimplemented)\n");
	132	#endif
	133
	134	return(mask);
	135	}
	136
	137	static int hostaudio_ioctl(struct inode inode, struct file file,
	138	unsigned int cmd, unsigned long arg)
	139	{
	140	struct hostaudio_state *state = file->private_data;
	141	unsigned long data = 0;
	142	int err;
	143
	144	#ifdef DEBUG
	145	printk("hostaudio: ioctl called, cmd = %u\n", cmd);
	146	#endif
	147	switch(cmd){
	148	case SNDCTL_DSP_SPEED:
	149	case SNDCTL_DSP_STEREO:
	150	case SNDCTL_DSP_GETBLKSIZE:
	151	case SNDCTL_DSP_CHANNELS:
	152	case SNDCTL_DSP_SUBDIVIDE:
	153	case SNDCTL_DSP_SETFRAGMENT:
4d338e1a	154	if(get_user(data, (int __user *) arg))
1da177e4 LT	155	return(-EFAULT);
	156	break;
	157	default:
	158	break;
	159	}
	160
	161	err = os_ioctl_generic(state->fd, cmd, (unsigned long) &data);
	162
	163	switch(cmd){
	164	case SNDCTL_DSP_SPEED:
	165	case SNDCTL_DSP_STEREO:
	166	case SNDCTL_DSP_GETBLKSIZE:
	167	case SNDCTL_DSP_CHANNELS:
	168	case SNDCTL_DSP_SUBDIVIDE:
	169	case SNDCTL_DSP_SETFRAGMENT:
4d338e1a	170	if(put_user(data, (int __user *) arg))
1da177e4 LT	171	return(-EFAULT);
	172	break;
	173	default:
	174	break;
	175	}
	176
	177	return(err);
	178	}
	179
	180	static int hostaudio_open(struct inode inode, struct file file)
	181	{
	182	struct hostaudio_state *state;
	183	int r = 0, w = 0;
	184	int ret;
	185
	186	#ifdef DEBUG
	187	printk("hostaudio: open called (host: %s)\n", dsp);
	188	#endif
	189
	190	state = kmalloc(sizeof(struct hostaudio_state), GFP_KERNEL);
	191	if(state == NULL)
	192	return(-ENOMEM);
	193
	194	if(file->f_mode & FMODE_READ) r = 1;
	195	if(file->f_mode & FMODE_WRITE) w = 1;
	196
	197	ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
	198	if(ret < 0){
	199	kfree(state);
	200	return(ret);
	201	}
	202
	203	state->fd = ret;
	204	file->private_data = state;
	205	return(0);
	206	}
	207
	208	static int hostaudio_release(struct inode inode, struct file file)
	209	{
	210	struct hostaudio_state *state = file->private_data;
	211
	212	#ifdef DEBUG
	213	printk("hostaudio: release called\n");
	214	#endif
	215
	216	os_close_file(state->fd);
	217	kfree(state);
	218
	219	return(0);
	220	}
	221
	222	/* /dev/mixer file operations */
	223
	224	static int hostmixer_ioctl_mixdev(struct inode inode, struct file file,
	225	unsigned int cmd, unsigned long arg)
	226	{
	227	struct hostmixer_state *state = file->private_data;
	228
	229	#ifdef DEBUG
	230	printk("hostmixer: ioctl called\n");
	231	#endif
	232
	233	return(os_ioctl_generic(state->fd, cmd, arg));
	234	}
235
236	static int hostmixer_open_mixdev(struct inode inode, struct file file)
237	{
238	struct hostmixer_state *state;
239	int r = 0, w = 0;
240	int ret;
241
242	#ifdef DEBUG
243	printk("hostmixer: open called (host: %s)\n", mixer);
244	#endif
245
246	state = kmalloc(sizeof(struct hostmixer_state), GFP_KERNEL);
247	if(state == NULL) return(-ENOMEM);
248
249	if(file->f_mode & FMODE_READ) r = 1;
250	if(file->f_mode & FMODE_WRITE) w = 1;
251
252	ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0);
253
254	if(ret < 0){
255	printk("hostaudio_open_mixdev failed to open '%s', err = %d\n",
256	dsp, -ret);
257	kfree(state);
258	return(ret);
259	}
260
261	file->private_data = state;
262	return(0);
263	}
264
265	static int hostmixer_release(struct inode inode, struct file file)
266	{
267	struct hostmixer_state *state = file->private_data;
268
269	#ifdef DEBUG
270	printk("hostmixer: release called\n");
271	#endif
272
273	os_close_file(state->fd);
274	kfree(state);
275
276	return(0);
277	}
278
279
280	/* kernel module operations */
281
5e7672ec	282	static const struct file_operations hostaudio_fops = {
1da177e4 LT	283	.owner = THIS_MODULE,
	284	.llseek = no_llseek,
	285	.read = hostaudio_read,
	286	.write = hostaudio_write,
	287	.poll = hostaudio_poll,
	288	.ioctl = hostaudio_ioctl,
	289	.mmap = NULL,
	290	.open = hostaudio_open,
	291	.release = hostaudio_release,
	292	};
	293
5e7672ec	294	static const struct file_operations hostmixer_fops = {
1da177e4 LT	295	.owner = THIS_MODULE,
	296	.llseek = no_llseek,
	297	.ioctl = hostmixer_ioctl_mixdev,
	298	.open = hostmixer_open_mixdev,
	299	.release = hostmixer_release,
	300	};
	301
	302	struct {
	303	int dev_audio;
	304	int dev_mixer;
	305	} module_data;
	306
	307	MODULE_AUTHOR("Steve Schmidtke");
	308	MODULE_DESCRIPTION("UML Audio Relay");
	309	MODULE_LICENSE("GPL");
	310
	311	static int __init hostaudio_init_module(void)
	312	{
	313	printk(KERN_INFO "UML Audio Relay (host dsp = %s, host mixer = %s)\n",
	314	dsp, mixer);
	315
	316	module_data.dev_audio = register_sound_dsp(&hostaudio_fops, -1);
	317	if(module_data.dev_audio < 0){
	318	printk(KERN_ERR "hostaudio: couldn't register DSP device!\n");
	319	return -ENODEV;
	320	}
	321
	322	module_data.dev_mixer = register_sound_mixer(&hostmixer_fops, -1);
	323	if(module_data.dev_mixer < 0){
	324	printk(KERN_ERR "hostmixer: couldn't register mixer "
	325	"device!\n");
	326	unregister_sound_dsp(module_data.dev_audio);
	327	return -ENODEV;
	328	}
	329
	330	return 0;
	331	}
	332
	333	static void __exit hostaudio_cleanup_module (void)
	334	{
	335	unregister_sound_mixer(module_data.dev_mixer);
	336	unregister_sound_dsp(module_data.dev_audio);
	337	}
	338
	339	module_init(hostaudio_init_module);
	340	module_exit(hostaudio_cleanup_module);
	341
	342	/*
	343	* Overrides for Emacs so that we follow Linus's tabbing style.
	344	* Emacs will notice this stuff at the end of the file and automatically
	345	* adjust the settings for this buffer only. This must remain at the end
	346	* of the file.
	347	* ---------------------------------------------------------------------------
	348	* Local variables:
	349	* c-file-style: "linux"
	350	* End:
	351	*/