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seq_file is _the_ standard interface for simple text proc files. Though, we still need to support the binary proc files and the text file write, and also we need to manage the device disconnection gracefully. Thus this patch just replaces the text file read code with seq_file while keeping the rest intact. snd_iprintf() helper function is now a macro to expand itself to seq_printf() to be compatible with the existing code. The seq_file object is stored to the unused entry->rbuffer->buffer pointer. When the output size is expected to be large (greater than PAGE_SIZE), the driver should set entry->size field beforehand. Then the given size will be preallocated and the multiple show calls can be avoided. Acked-by: Jaroslav Kysela <perex@perex.cz> Signed-off-by: Takashi Iwai <tiwai@suse.de>
213 lines
7.3 KiB
C
213 lines
7.3 KiB
C
#ifndef __SOUND_INFO_H
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#define __SOUND_INFO_H
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/*
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* Header file for info interface
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* Copyright (c) by Jaroslav Kysela <perex@perex.cz>
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#include <linux/poll.h>
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#include <linux/seq_file.h>
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/* buffer for information */
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struct snd_info_buffer {
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char *buffer; /* pointer to begin of buffer */
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unsigned int curr; /* current position in buffer */
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unsigned int size; /* current size */
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unsigned int len; /* total length of buffer */
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int stop; /* stop flag */
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int error; /* error code */
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};
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#define SNDRV_INFO_CONTENT_TEXT 0
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#define SNDRV_INFO_CONTENT_DATA 1
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struct snd_info_entry;
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struct snd_info_entry_text {
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void (*read)(struct snd_info_entry *entry,
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struct snd_info_buffer *buffer);
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void (*write)(struct snd_info_entry *entry,
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struct snd_info_buffer *buffer);
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};
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struct snd_info_entry_ops {
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int (*open)(struct snd_info_entry *entry,
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unsigned short mode, void **file_private_data);
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int (*release)(struct snd_info_entry *entry,
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unsigned short mode, void *file_private_data);
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ssize_t (*read)(struct snd_info_entry *entry, void *file_private_data,
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struct file *file, char __user *buf,
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size_t count, loff_t pos);
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ssize_t (*write)(struct snd_info_entry *entry, void *file_private_data,
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struct file *file, const char __user *buf,
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size_t count, loff_t pos);
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loff_t (*llseek)(struct snd_info_entry *entry,
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void *file_private_data, struct file *file,
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loff_t offset, int orig);
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unsigned int (*poll)(struct snd_info_entry *entry,
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void *file_private_data, struct file *file,
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poll_table *wait);
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int (*ioctl)(struct snd_info_entry *entry, void *file_private_data,
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struct file *file, unsigned int cmd, unsigned long arg);
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int (*mmap)(struct snd_info_entry *entry, void *file_private_data,
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struct inode *inode, struct file *file,
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struct vm_area_struct *vma);
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};
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struct snd_info_entry {
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const char *name;
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umode_t mode;
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long size;
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unsigned short content;
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union {
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struct snd_info_entry_text text;
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struct snd_info_entry_ops *ops;
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} c;
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struct snd_info_entry *parent;
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struct snd_card *card;
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struct module *module;
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void *private_data;
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void (*private_free)(struct snd_info_entry *entry);
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struct proc_dir_entry *p;
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struct mutex access;
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struct list_head children;
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struct list_head list;
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};
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#if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS)
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int snd_info_minor_register(void);
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int snd_info_minor_unregister(void);
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#else
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#define snd_info_minor_register() /* NOP */
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#define snd_info_minor_unregister() /* NOP */
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#endif
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#ifdef CONFIG_PROC_FS
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extern struct snd_info_entry *snd_seq_root;
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#ifdef CONFIG_SND_OSSEMUL
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extern struct snd_info_entry *snd_oss_root;
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void snd_card_info_read_oss(struct snd_info_buffer *buffer);
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#else
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#define snd_oss_root NULL
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static inline void snd_card_info_read_oss(struct snd_info_buffer *buffer) {}
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#endif
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/**
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* snd_iprintf - printf on the procfs buffer
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* @buf: the procfs buffer
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* @fmt: the printf format
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*
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* Outputs the string on the procfs buffer just like printf().
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*
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* Return: zero for success, or a negative error code.
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*/
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#define snd_iprintf(buf, fmt, args...) \
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seq_printf((struct seq_file *)(buf)->buffer, fmt, ##args)
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int snd_info_init(void);
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int snd_info_done(void);
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int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len);
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const char *snd_info_get_str(char *dest, const char *src, int len);
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struct snd_info_entry *snd_info_create_module_entry(struct module *module,
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const char *name,
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struct snd_info_entry *parent);
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struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card,
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const char *name,
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struct snd_info_entry *parent);
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void snd_info_free_entry(struct snd_info_entry *entry);
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int snd_info_store_text(struct snd_info_entry *entry);
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int snd_info_restore_text(struct snd_info_entry *entry);
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int snd_info_card_create(struct snd_card *card);
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int snd_info_card_register(struct snd_card *card);
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int snd_info_card_free(struct snd_card *card);
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void snd_info_card_disconnect(struct snd_card *card);
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void snd_info_card_id_change(struct snd_card *card);
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int snd_info_register(struct snd_info_entry *entry);
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/* for card drivers */
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int snd_card_proc_new(struct snd_card *card, const char *name,
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struct snd_info_entry **entryp);
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static inline void snd_info_set_text_ops(struct snd_info_entry *entry,
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void *private_data,
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void (*read)(struct snd_info_entry *, struct snd_info_buffer *))
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{
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entry->private_data = private_data;
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entry->c.text.read = read;
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}
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int snd_info_check_reserved_words(const char *str);
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#else
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#define snd_seq_root NULL
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#define snd_oss_root NULL
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static inline int snd_iprintf(struct snd_info_buffer *buffer, char *fmt, ...) { return 0; }
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static inline int snd_info_init(void) { return 0; }
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static inline int snd_info_done(void) { return 0; }
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static inline int snd_info_get_line(struct snd_info_buffer *buffer, char *line, int len) { return 0; }
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static inline char *snd_info_get_str(char *dest, char *src, int len) { return NULL; }
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static inline struct snd_info_entry *snd_info_create_module_entry(struct module *module, const char *name, struct snd_info_entry *parent) { return NULL; }
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static inline struct snd_info_entry *snd_info_create_card_entry(struct snd_card *card, const char *name, struct snd_info_entry *parent) { return NULL; }
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static inline void snd_info_free_entry(struct snd_info_entry *entry) { ; }
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static inline int snd_info_card_create(struct snd_card *card) { return 0; }
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static inline int snd_info_card_register(struct snd_card *card) { return 0; }
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static inline int snd_info_card_free(struct snd_card *card) { return 0; }
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static inline void snd_info_card_disconnect(struct snd_card *card) { }
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static inline void snd_info_card_id_change(struct snd_card *card) { }
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static inline int snd_info_register(struct snd_info_entry *entry) { return 0; }
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static inline int snd_card_proc_new(struct snd_card *card, const char *name,
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struct snd_info_entry **entryp) { return -EINVAL; }
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static inline void snd_info_set_text_ops(struct snd_info_entry *entry __attribute__((unused)),
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void *private_data,
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void (*read)(struct snd_info_entry *, struct snd_info_buffer *)) {}
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static inline int snd_info_check_reserved_words(const char *str) { return 1; }
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#endif
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/*
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* OSS info part
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*/
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#if defined(CONFIG_SND_OSSEMUL) && defined(CONFIG_PROC_FS)
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#define SNDRV_OSS_INFO_DEV_AUDIO 0
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#define SNDRV_OSS_INFO_DEV_SYNTH 1
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#define SNDRV_OSS_INFO_DEV_MIDI 2
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#define SNDRV_OSS_INFO_DEV_TIMERS 4
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#define SNDRV_OSS_INFO_DEV_MIXERS 5
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#define SNDRV_OSS_INFO_DEV_COUNT 6
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int snd_oss_info_register(int dev, int num, char *string);
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#define snd_oss_info_unregister(dev, num) snd_oss_info_register(dev, num, NULL)
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#endif /* CONFIG_SND_OSSEMUL && CONFIG_PROC_FS */
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#endif /* __SOUND_INFO_H */
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