[ALSA] dynamic minors (3/6): store device-specific object pointers dynamically

Instead of storing the pointers to the device-specific structures in an
array, put them into the struct snd_minor, and look them up dynamically.

This makes the device type modules independent of the minor number
encoding.

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

1 files changed, 7 insertions, 2 deletions

diff --git a/include/sound/core.h b/include/sound/core.h
index 67b0a7e764e..90ac6132ea3 100644
--- a/include/sound/core.h
+++ b/include/sound/core.h
@@ -187,6 +187,7 @@ struct snd_minor {
         int card;                       /* card number */
         int device;                     /* device number */
         struct file_operations *f_ops;  /* file operations */
+        void *private_data;             /* private data for f_ops->open */
         char name[0];                   /* device name (keep at the end of
                                                                 structure) */
 };
@@ -199,13 +200,17 @@ extern int snd_ecards_limit;
 void snd_request_card(int card);
 
 int snd_register_device(int type, struct snd_card *card, int dev,
-                        struct file_operations *f_ops, const char *name);
+                        struct file_operations *f_ops, void *private_data,
+                        const char *name);
 int snd_unregister_device(int type, struct snd_card *card, int dev);
+void *snd_lookup_minor_data(unsigned int minor, int type);
 
 #ifdef CONFIG_SND_OSSEMUL
 int snd_register_oss_device(int type, struct snd_card *card, int dev,
-                            struct file_operations *f_ops, const char *name);
+                            struct file_operations *f_ops, void *private_data,
+                            const char *name);
 int snd_unregister_oss_device(int type, struct snd_card *card, int dev);
+void *snd_lookup_oss_minor_data(unsigned int minor, int type);
 #endif
 
 int snd_minor_info_init(void);