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1// SPDX-License-Identifier: GPL-2.0-or-later2/*3 * OSS compatible sequencer driver4 *5 * registration of device and proc6 *7 * Copyright (C) 1998,99 Takashi Iwai <tiwai@suse.de>8 */9 10#include <linux/init.h>11#include <linux/module.h>12#include <linux/mutex.h>13#include <linux/compat.h>14#include <sound/core.h>15#include <sound/minors.h>16#include <sound/initval.h>17#include "seq_oss_device.h"18#include "seq_oss_synth.h"19 20/*21 * module option22 */23MODULE_AUTHOR("Takashi Iwai <tiwai@suse.de>");24MODULE_DESCRIPTION("OSS-compatible sequencer module");25MODULE_LICENSE("GPL");26/* Takashi says this is really only for sound-service-0-, but this is OK. */27MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_SEQUENCER);28MODULE_ALIAS_SNDRV_MINOR(SNDRV_MINOR_OSS_MUSIC);29 30 31/*32 * prototypes33 */34static int register_device(void);35static void unregister_device(void);36#ifdef CONFIG_SND_PROC_FS37static int register_proc(void);38static void unregister_proc(void);39#else40static inline int register_proc(void) { return 0; }41static inline void unregister_proc(void) {}42#endif43 44static int odev_open(struct inode *inode, struct file *file);45static int odev_release(struct inode *inode, struct file *file);46static ssize_t odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset);47static ssize_t odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset);48static long odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg);49static __poll_t odev_poll(struct file *file, poll_table * wait);50 51 52/*53 * module interface54 */55 56static struct snd_seq_driver seq_oss_synth_driver = {57 .driver = {58 .name = KBUILD_MODNAME,59 .probe = snd_seq_oss_synth_probe,60 .remove = snd_seq_oss_synth_remove,61 },62 .id = SNDRV_SEQ_DEV_ID_OSS,63 .argsize = sizeof(struct snd_seq_oss_reg),64};65 66static int __init alsa_seq_oss_init(void)67{68 int rc;69 70 rc = register_device();71 if (rc < 0)72 goto error;73 rc = register_proc();74 if (rc < 0) {75 unregister_device();76 goto error;77 }78 rc = snd_seq_oss_create_client();79 if (rc < 0) {80 unregister_proc();81 unregister_device();82 goto error;83 }84 85 rc = snd_seq_driver_register(&seq_oss_synth_driver);86 if (rc < 0) {87 snd_seq_oss_delete_client();88 unregister_proc();89 unregister_device();90 goto error;91 }92 93 /* success */94 snd_seq_oss_synth_init();95 96 error:97 return rc;98}99 100static void __exit alsa_seq_oss_exit(void)101{102 snd_seq_driver_unregister(&seq_oss_synth_driver);103 snd_seq_oss_delete_client();104 unregister_proc();105 unregister_device();106}107 108module_init(alsa_seq_oss_init)109module_exit(alsa_seq_oss_exit)110 111/*112 * ALSA minor device interface113 */114 115static DEFINE_MUTEX(register_mutex);116 117static int118odev_open(struct inode *inode, struct file *file)119{120 int level, rc;121 122 if (iminor(inode) == SNDRV_MINOR_OSS_MUSIC)123 level = SNDRV_SEQ_OSS_MODE_MUSIC;124 else125 level = SNDRV_SEQ_OSS_MODE_SYNTH;126 127 mutex_lock(®ister_mutex);128 rc = snd_seq_oss_open(file, level);129 mutex_unlock(®ister_mutex);130 131 return rc;132}133 134static int135odev_release(struct inode *inode, struct file *file)136{137 struct seq_oss_devinfo *dp;138 139 dp = file->private_data;140 if (!dp)141 return 0;142 143 mutex_lock(®ister_mutex);144 snd_seq_oss_release(dp);145 mutex_unlock(®ister_mutex);146 147 return 0;148}149 150static ssize_t151odev_read(struct file *file, char __user *buf, size_t count, loff_t *offset)152{153 struct seq_oss_devinfo *dp;154 dp = file->private_data;155 if (snd_BUG_ON(!dp))156 return -ENXIO;157 return snd_seq_oss_read(dp, buf, count);158}159 160 161static ssize_t162odev_write(struct file *file, const char __user *buf, size_t count, loff_t *offset)163{164 struct seq_oss_devinfo *dp;165 dp = file->private_data;166 if (snd_BUG_ON(!dp))167 return -ENXIO;168 return snd_seq_oss_write(dp, buf, count, file);169}170 171static long172odev_ioctl(struct file *file, unsigned int cmd, unsigned long arg)173{174 struct seq_oss_devinfo *dp;175 long rc;176 177 dp = file->private_data;178 if (snd_BUG_ON(!dp))179 return -ENXIO;180 181 if (cmd != SNDCTL_SEQ_SYNC &&182 mutex_lock_interruptible(®ister_mutex))183 return -ERESTARTSYS;184 rc = snd_seq_oss_ioctl(dp, cmd, arg);185 if (cmd != SNDCTL_SEQ_SYNC)186 mutex_unlock(®ister_mutex);187 return rc;188}189 190#ifdef CONFIG_COMPAT191static long odev_ioctl_compat(struct file *file, unsigned int cmd,192 unsigned long arg)193{194 return odev_ioctl(file, cmd, (unsigned long)compat_ptr(arg));195}196#else197#define odev_ioctl_compat NULL198#endif199 200static __poll_t201odev_poll(struct file *file, poll_table * wait)202{203 struct seq_oss_devinfo *dp;204 dp = file->private_data;205 if (snd_BUG_ON(!dp))206 return EPOLLERR;207 return snd_seq_oss_poll(dp, file, wait);208}209 210/*211 * registration of sequencer minor device212 */213 214static const struct file_operations seq_oss_f_ops =215{216 .owner = THIS_MODULE,217 .read = odev_read,218 .write = odev_write,219 .open = odev_open,220 .release = odev_release,221 .poll = odev_poll,222 .unlocked_ioctl = odev_ioctl,223 .compat_ioctl = odev_ioctl_compat,224 .llseek = noop_llseek,225};226 227static int __init228register_device(void)229{230 int rc;231 232 mutex_lock(®ister_mutex);233 rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,234 NULL, 0,235 &seq_oss_f_ops, NULL);236 if (rc < 0) {237 pr_err("ALSA: seq_oss: can't register device seq\n");238 mutex_unlock(®ister_mutex);239 return rc;240 }241 rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC,242 NULL, 0,243 &seq_oss_f_ops, NULL);244 if (rc < 0) {245 pr_err("ALSA: seq_oss: can't register device music\n");246 snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0);247 mutex_unlock(®ister_mutex);248 return rc;249 }250 mutex_unlock(®ister_mutex);251 return 0;252}253 254static void255unregister_device(void)256{257 mutex_lock(®ister_mutex);258 if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC, NULL, 0) < 0) 259 pr_err("ALSA: seq_oss: error unregister device music\n");260 if (snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0) < 0)261 pr_err("ALSA: seq_oss: error unregister device seq\n");262 mutex_unlock(®ister_mutex);263}264 265/*266 * /proc interface267 */268 269#ifdef CONFIG_SND_PROC_FS270 271static struct snd_info_entry *info_entry;272 273static void274info_read(struct snd_info_entry *entry, struct snd_info_buffer *buf)275{276 mutex_lock(®ister_mutex);277 snd_iprintf(buf, "OSS sequencer emulation version %s\n", SNDRV_SEQ_OSS_VERSION_STR);278 snd_seq_oss_system_info_read(buf);279 snd_seq_oss_synth_info_read(buf);280 snd_seq_oss_midi_info_read(buf);281 mutex_unlock(®ister_mutex);282}283 284 285static int __init286register_proc(void)287{288 struct snd_info_entry *entry;289 290 entry = snd_info_create_module_entry(THIS_MODULE, SNDRV_SEQ_OSS_PROCNAME, snd_seq_root);291 if (entry == NULL)292 return -ENOMEM;293 294 entry->content = SNDRV_INFO_CONTENT_TEXT;295 entry->private_data = NULL;296 entry->c.text.read = info_read;297 if (snd_info_register(entry) < 0) {298 snd_info_free_entry(entry);299 return -ENOMEM;300 }301 info_entry = entry;302 return 0;303}304 305static void306unregister_proc(void)307{308 snd_info_free_entry(info_entry);309 info_entry = NULL;310}311#endif /* CONFIG_SND_PROC_FS */312