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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-07 18:49:45 +0000 |
commit | 2c3c1048746a4622d8c89a29670120dc8fab93c4 (patch) | |
tree | 848558de17fb3008cdf4d861b01ac7781903ce39 /arch/um/drivers/hostaudio_kern.c | |
parent | Initial commit. (diff) | |
download | linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.tar.xz linux-2c3c1048746a4622d8c89a29670120dc8fab93c4.zip |
Adding upstream version 6.1.76.upstream/6.1.76upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'arch/um/drivers/hostaudio_kern.c')
-rw-r--r-- | arch/um/drivers/hostaudio_kern.c | 353 |
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); |