// SPDX-License-Identifier: GPL-2.0-or-later /* * Digital Audio (PCM) abstract layer / OSS compatible * Copyright (c) by Jaroslav Kysela <[email protected]> */ #if 0 #define PLUGIN_DEBUG #endif #if 0 #define OSS_DEBUG #endif #include <linux/init.h> #include <linux/slab.h> #include <linux/sched/signal.h> #include <linux/time.h> #include <linux/vmalloc.h> #include <linux/module.h> #include <linux/math64.h> #include <linux/string.h> #include <linux/compat.h> #include <sound/core.h> #include <sound/minors.h> #include <sound/pcm.h> #include <sound/pcm_params.h> #include "pcm_plugin.h" #include <sound/info.h> #include <linux/soundcard.h> #include <sound/initval.h> #include <sound/mixer_oss.h> #define OSS_ALSAEMULVER … static int dsp_map[SNDRV_CARDS]; static int adsp_map[SNDRV_CARDS] = …; static bool nonblock_open = …; MODULE_AUTHOR(…) …; MODULE_DESCRIPTION(…) …; MODULE_LICENSE(…) …; module_param_array(…); MODULE_PARM_DESC(…) …; module_param_array(…); MODULE_PARM_DESC(…) …; module_param(nonblock_open, bool, 0644); MODULE_PARM_DESC(…) …; MODULE_ALIAS_SNDRV_MINOR(…); MODULE_ALIAS_SNDRV_MINOR(…); static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file); static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file); static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file); /* * helper functions to process hw_params */ static int snd_interval_refine_min(struct snd_interval *i, unsigned int min, int openmin) { … } static int snd_interval_refine_max(struct snd_interval *i, unsigned int max, int openmax) { … } static int snd_interval_refine_set(struct snd_interval *i, unsigned int val) { … } /** * snd_pcm_hw_param_value_min * @params: the hw_params instance * @var: parameter to retrieve * @dir: pointer to the direction (-1,0,1) or NULL * * Return the minimum value for field PAR. */ static unsigned int snd_pcm_hw_param_value_min(const struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var, int *dir) { … } /** * snd_pcm_hw_param_value_max * @params: the hw_params instance * @var: parameter to retrieve * @dir: pointer to the direction (-1,0,1) or NULL * * Return the maximum value for field PAR. */ static int snd_pcm_hw_param_value_max(const struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var, int *dir) { … } static int _snd_pcm_hw_param_mask(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var, const struct snd_mask *val) { … } static int snd_pcm_hw_param_mask(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var, const struct snd_mask *val) { … } static int _snd_pcm_hw_param_min(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var, unsigned int val, int dir) { … } /** * snd_pcm_hw_param_min * @pcm: PCM instance * @params: the hw_params instance * @var: parameter to retrieve * @val: minimal value * @dir: pointer to the direction (-1,0,1) or NULL * * Inside configuration space defined by PARAMS remove from PAR all * values < VAL. Reduce configuration space accordingly. * Return new minimum or -EINVAL if the configuration space is empty */ static int snd_pcm_hw_param_min(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var, unsigned int val, int *dir) { … } static int _snd_pcm_hw_param_max(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var, unsigned int val, int dir) { … } /** * snd_pcm_hw_param_max * @pcm: PCM instance * @params: the hw_params instance * @var: parameter to retrieve * @val: maximal value * @dir: pointer to the direction (-1,0,1) or NULL * * Inside configuration space defined by PARAMS remove from PAR all * values >= VAL + 1. Reduce configuration space accordingly. * Return new maximum or -EINVAL if the configuration space is empty */ static int snd_pcm_hw_param_max(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var, unsigned int val, int *dir) { … } static int boundary_sub(int a, int adir, int b, int bdir, int *c, int *cdir) { … } static int boundary_lt(unsigned int a, int adir, unsigned int b, int bdir) { … } /* Return 1 if min is nearer to best than max */ static int boundary_nearer(int min, int mindir, int best, int bestdir, int max, int maxdir) { … } /** * snd_pcm_hw_param_near * @pcm: PCM instance * @params: the hw_params instance * @var: parameter to retrieve * @best: value to set * @dir: pointer to the direction (-1,0,1) or NULL * * Inside configuration space defined by PARAMS set PAR to the available value * nearest to VAL. Reduce configuration space accordingly. * This function cannot be called for SNDRV_PCM_HW_PARAM_ACCESS, * SNDRV_PCM_HW_PARAM_FORMAT, SNDRV_PCM_HW_PARAM_SUBFORMAT. * Return the value found. */ static int snd_pcm_hw_param_near(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var, unsigned int best, int *dir) { … } static int _snd_pcm_hw_param_set(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var, unsigned int val, int dir) { … } /** * snd_pcm_hw_param_set * @pcm: PCM instance * @params: the hw_params instance * @var: parameter to retrieve * @val: value to set * @dir: pointer to the direction (-1,0,1) or NULL * * Inside configuration space defined by PARAMS remove from PAR all * values != VAL. Reduce configuration space accordingly. * Return VAL or -EINVAL if the configuration space is empty */ static int snd_pcm_hw_param_set(struct snd_pcm_substream *pcm, struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var, unsigned int val, int dir) { … } static int _snd_pcm_hw_param_setinteger(struct snd_pcm_hw_params *params, snd_pcm_hw_param_t var) { … } /* * plugin */ #ifdef CONFIG_SND_PCM_OSS_PLUGINS static int snd_pcm_oss_plugin_clear(struct snd_pcm_substream *substream) { … } static int snd_pcm_plugin_insert(struct snd_pcm_plugin *plugin) { … } int snd_pcm_plugin_append(struct snd_pcm_plugin *plugin) { … } #endif /* CONFIG_SND_PCM_OSS_PLUGINS */ static long snd_pcm_oss_bytes(struct snd_pcm_substream *substream, long frames) { … } static long snd_pcm_alsa_frames(struct snd_pcm_substream *substream, long bytes) { … } static inline snd_pcm_uframes_t get_hw_ptr_period(struct snd_pcm_runtime *runtime) { … } /* define extended formats in the recent OSS versions (if any) */ /* linear formats */ #define AFMT_S32_LE … #define AFMT_S32_BE … #define AFMT_S24_LE … #define AFMT_S24_BE … #define AFMT_S24_PACKED … /* other supported formats */ #define AFMT_FLOAT … #define AFMT_SPDIF_RAW … /* unsupported formats */ #define AFMT_AC3 … #define AFMT_VORBIS … static snd_pcm_format_t snd_pcm_oss_format_from(int format) { … } static int snd_pcm_oss_format_to(snd_pcm_format_t format) { … } static int snd_pcm_oss_period_size(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *oss_params, struct snd_pcm_hw_params *slave_params) { … } static int choose_rate(struct snd_pcm_substream *substream, struct snd_pcm_hw_params *params, unsigned int best_rate) { … } /* parameter locking: returns immediately if tried during streaming */ static int lock_params(struct snd_pcm_runtime *runtime) { … } static void unlock_params(struct snd_pcm_runtime *runtime) { … } static void snd_pcm_oss_release_buffers(struct snd_pcm_substream *substream) { … } /* call with params_lock held */ static int snd_pcm_oss_change_params_locked(struct snd_pcm_substream *substream) { … } /* this one takes the lock by itself */ static int snd_pcm_oss_change_params(struct snd_pcm_substream *substream, bool trylock) { … } static int snd_pcm_oss_get_active_substream(struct snd_pcm_oss_file *pcm_oss_file, struct snd_pcm_substream **r_substream) { … } /* call with params_lock held */ /* NOTE: this always call PREPARE unconditionally no matter whether * runtime->oss.prepare is set or not */ static int snd_pcm_oss_prepare(struct snd_pcm_substream *substream) { … } static int snd_pcm_oss_make_ready(struct snd_pcm_substream *substream) { … } /* call with params_lock held */ static int snd_pcm_oss_make_ready_locked(struct snd_pcm_substream *substream) { … } static int snd_pcm_oss_capture_position_fixup(struct snd_pcm_substream *substream, snd_pcm_sframes_t *delay) { … } snd_pcm_sframes_t snd_pcm_oss_write3(struct snd_pcm_substream *substream, const char *ptr, snd_pcm_uframes_t frames, int in_kernel) { … } snd_pcm_sframes_t snd_pcm_oss_read3(struct snd_pcm_substream *substream, char *ptr, snd_pcm_uframes_t frames, int in_kernel) { … } #ifdef CONFIG_SND_PCM_OSS_PLUGINS snd_pcm_sframes_t snd_pcm_oss_writev3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames) { … } snd_pcm_sframes_t snd_pcm_oss_readv3(struct snd_pcm_substream *substream, void **bufs, snd_pcm_uframes_t frames) { … } #endif /* CONFIG_SND_PCM_OSS_PLUGINS */ static ssize_t snd_pcm_oss_write2(struct snd_pcm_substream *substream, const char *buf, size_t bytes, int in_kernel) { … } static ssize_t snd_pcm_oss_write1(struct snd_pcm_substream *substream, const char __user *buf, size_t bytes) { … } static ssize_t snd_pcm_oss_read2(struct snd_pcm_substream *substream, char *buf, size_t bytes, int in_kernel) { … } static ssize_t snd_pcm_oss_read1(struct snd_pcm_substream *substream, char __user *buf, size_t bytes) { … } static int snd_pcm_oss_reset(struct snd_pcm_oss_file *pcm_oss_file) { … } static int snd_pcm_oss_post(struct snd_pcm_oss_file *pcm_oss_file) { … } static int snd_pcm_oss_sync1(struct snd_pcm_substream *substream, size_t size) { … } static int snd_pcm_oss_sync(struct snd_pcm_oss_file *pcm_oss_file) { … } static int snd_pcm_oss_set_rate(struct snd_pcm_oss_file *pcm_oss_file, int rate) { … } static int snd_pcm_oss_get_rate(struct snd_pcm_oss_file *pcm_oss_file) { … } static int snd_pcm_oss_set_channels(struct snd_pcm_oss_file *pcm_oss_file, unsigned int channels) { … } static int snd_pcm_oss_get_channels(struct snd_pcm_oss_file *pcm_oss_file) { … } static int snd_pcm_oss_get_block_size(struct snd_pcm_oss_file *pcm_oss_file) { … } static int snd_pcm_oss_get_formats(struct snd_pcm_oss_file *pcm_oss_file) { … } static int snd_pcm_oss_set_format(struct snd_pcm_oss_file *pcm_oss_file, int format) { … } static int snd_pcm_oss_get_format(struct snd_pcm_oss_file *pcm_oss_file) { … } static int snd_pcm_oss_set_subdivide1(struct snd_pcm_substream *substream, int subdivide) { … } static int snd_pcm_oss_set_subdivide(struct snd_pcm_oss_file *pcm_oss_file, int subdivide) { … } static int snd_pcm_oss_set_fragment1(struct snd_pcm_substream *substream, unsigned int val) { … } static int snd_pcm_oss_set_fragment(struct snd_pcm_oss_file *pcm_oss_file, unsigned int val) { … } static int snd_pcm_oss_nonblock(struct file * file) { … } static int snd_pcm_oss_get_caps1(struct snd_pcm_substream *substream, int res) { … } static int snd_pcm_oss_get_caps(struct snd_pcm_oss_file *pcm_oss_file) { … } static void snd_pcm_oss_simulate_fill(struct snd_pcm_substream *substream, snd_pcm_uframes_t hw_ptr) { … } static int snd_pcm_oss_set_trigger(struct snd_pcm_oss_file *pcm_oss_file, int trigger) { … } static int snd_pcm_oss_get_trigger(struct snd_pcm_oss_file *pcm_oss_file) { … } static int snd_pcm_oss_get_odelay(struct snd_pcm_oss_file *pcm_oss_file) { … } static int snd_pcm_oss_get_ptr(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct count_info __user * _info) { … } static int snd_pcm_oss_get_space(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct audio_buf_info __user *_info) { … } static int snd_pcm_oss_get_mapbuf(struct snd_pcm_oss_file *pcm_oss_file, int stream, struct buffmem_desc __user * _info) { … } static const char *strip_task_path(const char *path) { … } static void snd_pcm_oss_look_for_setup(struct snd_pcm *pcm, int stream, const char *task_name, struct snd_pcm_oss_setup *rsetup) { … } static void snd_pcm_oss_release_substream(struct snd_pcm_substream *substream) { … } static void snd_pcm_oss_init_substream(struct snd_pcm_substream *substream, struct snd_pcm_oss_setup *setup, int minor) { … } static int snd_pcm_oss_release_file(struct snd_pcm_oss_file *pcm_oss_file) { … } static int snd_pcm_oss_open_file(struct file *file, struct snd_pcm *pcm, struct snd_pcm_oss_file **rpcm_oss_file, int minor, struct snd_pcm_oss_setup *setup) { … } static int snd_task_name(struct task_struct *task, char *name, size_t size) { … } static int snd_pcm_oss_open(struct inode *inode, struct file *file) { … } static int snd_pcm_oss_release(struct inode *inode, struct file *file) { … } static long snd_pcm_oss_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { … } #ifdef CONFIG_COMPAT /* all compatible */ static long snd_pcm_oss_ioctl_compat(struct file *file, unsigned int cmd, unsigned long arg) { … } #else #define snd_pcm_oss_ioctl_compat … #endif static ssize_t snd_pcm_oss_read(struct file *file, char __user *buf, size_t count, loff_t *offset) { … } static ssize_t snd_pcm_oss_write(struct file *file, const char __user *buf, size_t count, loff_t *offset) { … } static int snd_pcm_oss_playback_ready(struct snd_pcm_substream *substream) { … } static int snd_pcm_oss_capture_ready(struct snd_pcm_substream *substream) { … } static __poll_t snd_pcm_oss_poll(struct file *file, poll_table * wait) { … } static int snd_pcm_oss_mmap(struct file *file, struct vm_area_struct *area) { … } #ifdef CONFIG_SND_VERBOSE_PROCFS /* * /proc interface */ static void snd_pcm_oss_proc_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer) { … } static void snd_pcm_oss_proc_free_setup_list(struct snd_pcm_str * pstr) { … } static void snd_pcm_oss_proc_write(struct snd_info_entry *entry, struct snd_info_buffer *buffer) { … } static void snd_pcm_oss_proc_init(struct snd_pcm *pcm) { … } static void snd_pcm_oss_proc_done(struct snd_pcm *pcm) { … } #else /* !CONFIG_SND_VERBOSE_PROCFS */ static inline void snd_pcm_oss_proc_init(struct snd_pcm *pcm) { } static inline void snd_pcm_oss_proc_done(struct snd_pcm *pcm) { } #endif /* CONFIG_SND_VERBOSE_PROCFS */ /* * ENTRY functions */ static const struct file_operations snd_pcm_oss_f_reg = …; static void register_oss_dsp(struct snd_pcm *pcm, int index) { … } static int snd_pcm_oss_register_minor(struct snd_pcm *pcm) { … } static int snd_pcm_oss_disconnect_minor(struct snd_pcm *pcm) { … } static int snd_pcm_oss_unregister_minor(struct snd_pcm *pcm) { … } static struct snd_pcm_notify snd_pcm_oss_notify = …; static int __init alsa_pcm_oss_init(void) { … } static void __exit alsa_pcm_oss_exit(void) { … } module_init(…) … module_exit(…)
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