[ALSA] dynamic minors (1/6): store device type in struct snd_minor

Instead of a comment string, store the device type in the snd_minor
structure.  This makes snd_minor more flexible, and has the nice side
effect that we don't need anymore to create a separate snd_minor
template for registering a device but can pass the file_operations
directly to snd_register_device().
Signed-off-by: Clemens Ladisch <clemens@ladisch.de>

include/sound/core.h

@@ -185,8 +185,8 @@ static inline int snd_power_wait(struct snd_card *card, unsigned int state, stru
 struct snd_minor {
 	struct list_head list;		/* list of all minors per card */
 	int number;			/* minor number */
+	int type;			/* SNDRV_DEVICE_TYPE_XXX */
 	int device;			/* device number */
-	const char *comment;		/* for /proc/asound/devices */
 	struct file_operations *f_ops;	/* file operations */
 	char name[0];			/* device name (keep at the end of
 								structure) */
@@ -199,11 +199,13 @@ extern int snd_ecards_limit;
 
 void snd_request_card(int card);
 
-int snd_register_device(int type, struct snd_card *card, int dev, struct snd_minor *reg, const char *name);
+int snd_register_device(int type, struct snd_card *card, int dev,
+			struct file_operations *f_ops, const char *name);
 int snd_unregister_device(int type, struct snd_card *card, int dev);
 
 #ifdef CONFIG_SND_OSSEMUL
-int snd_register_oss_device(int type, struct snd_card *card, int dev, struct snd_minor *reg, const char *name);
+int snd_register_oss_device(int type, struct snd_card *card, int dev,
+			    struct file_operations *f_ops, const char *name);
 int snd_unregister_oss_device(int type, struct snd_card *card, int dev);
 #endif
 

include/sound/pcm.h

@@ -402,7 +402,6 @@ struct snd_pcm_str {
 	struct snd_pcm_oss_stream oss;
 #endif
 	struct snd_pcm_file *files;
-	struct snd_minor *reg;
 	struct snd_info_entry *proc_root;
 	struct snd_info_entry *proc_info_entry;
 #ifdef CONFIG_SND_DEBUG
@@ -441,7 +440,7 @@ struct snd_pcm_notify {
  */
 
 extern struct snd_pcm *snd_pcm_devices[];
-extern struct snd_minor snd_pcm_reg[2];
+extern struct file_operations snd_pcm_f_ops[2];
 
 int snd_pcm_new(struct snd_card *card, char *id, int device,
 		int playback_count, int capture_count,

sound/core/control.c

@@ -1264,12 +1264,6 @@ static struct file_operations snd_ctl_f_ops =
 	.fasync =	snd_ctl_fasync,
 };
 
-static struct snd_minor snd_ctl_reg =
-{
-	.comment =	"ctl",
-	.f_ops =	&snd_ctl_f_ops,
-};
-
 /*
  * registration of the control device
  */
@@ -1284,7 +1278,7 @@ static int snd_ctl_dev_register(struct snd_device *device)
 	snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO);
 	sprintf(name, "controlC%i", cardnum);
 	if ((err = snd_register_device(SNDRV_DEVICE_TYPE_CONTROL,
-					card, 0, &snd_ctl_reg, name)) < 0)
+				       card, -1, &snd_ctl_f_ops, name)) < 0)
 		return err;
 	return 0;
 }
@@ -1336,7 +1330,8 @@ static int snd_ctl_dev_unregister(struct snd_device *device)
 	snd_assert(card != NULL, return -ENXIO);
 	cardnum = card->number;
 	snd_assert(cardnum >= 0 && cardnum < SNDRV_CARDS, return -ENXIO);
-	if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL, card, 0)) < 0)
+	if ((err = snd_unregister_device(SNDRV_DEVICE_TYPE_CONTROL,
+					 card, -1)) < 0)
 		return err;
 	return snd_ctl_dev_free(device);
 }

sound/core/hwdep.c

@@ -330,12 +330,6 @@ static struct file_operations snd_hwdep_f_ops =
 	.mmap =		snd_hwdep_mmap,
 };
 
-static struct snd_minor snd_hwdep_reg =
-{
-	.comment =	"hardware dependent",
-	.f_ops =	&snd_hwdep_f_ops,
-};
-
 /**
  * snd_hwdep_new - create a new hwdep instance
  * @card: the card instance
@@ -416,7 +410,7 @@ static int snd_hwdep_dev_register(struct snd_device *device)
 	sprintf(name, "hwC%iD%i", hwdep->card->number, hwdep->device);
 	if ((err = snd_register_device(SNDRV_DEVICE_TYPE_HWDEP,
 				       hwdep->card, hwdep->device,
-				       &snd_hwdep_reg, name)) < 0) {
+				       &snd_hwdep_f_ops, name)) < 0) {
 		snd_printk(KERN_ERR "unable to register hardware dependent device %i:%i\n",
 			   hwdep->card->number, hwdep->device);
 		snd_hwdep_devices[idx] = NULL;
@@ -431,7 +425,8 @@ static int snd_hwdep_dev_register(struct snd_device *device)
 		} else {
 			if (snd_register_oss_device(hwdep->oss_type,
 						    hwdep->card, hwdep->device,
-						    &snd_hwdep_reg, hwdep->oss_dev) < 0) {
+						    &snd_hwdep_f_ops,
+						    hwdep->oss_dev) < 0) {
 				snd_printk(KERN_ERR "unable to register OSS compatibility device %i:%i\n",
 					   hwdep->card->number, hwdep->device);
 			} else

sound/core/oss/mixer_oss.c

@@ -398,12 +398,6 @@ static struct file_operations snd_mixer_oss_f_ops =
 	.compat_ioctl =	snd_mixer_oss_ioctl_compat,
 };
 
-static struct snd_minor snd_mixer_oss_reg =
-{
-	.comment =	"mixer",
-	.f_ops =	&snd_mixer_oss_f_ops,
-};
-
 /*
  *  utilities
  */
@@ -1292,7 +1286,7 @@ static int snd_mixer_oss_notify_handler(struct snd_card *card, int cmd)
 		sprintf(name, "mixer%i%i", card->number, 0);
 		if ((err = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIXER,
 						   card, 0,
-						   &snd_mixer_oss_reg,
+						   &snd_mixer_oss_f_ops,
 						   name)) < 0) {
 			snd_printk(KERN_ERR "unable to register OSS mixer device %i:%i\n",
 				   card->number, 0);

sound/core/oss/pcm_oss.c

@@ -2444,18 +2444,12 @@ static struct file_operations snd_pcm_oss_f_reg =
 	.mmap =		snd_pcm_oss_mmap,
 };
 
-static struct snd_minor snd_pcm_oss_reg =
-{
-	.comment =	"digital audio",
-	.f_ops =	&snd_pcm_oss_f_reg,
-};
-
 static void register_oss_dsp(struct snd_pcm *pcm, int index)
 {
 	char name[128];
 	sprintf(name, "dsp%i%i", pcm->card->number, pcm->device);
 	if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_PCM,
-				    pcm->card, index, &snd_pcm_oss_reg,
+				    pcm->card, index, &snd_pcm_oss_f_reg,
 				    name) < 0) {
 		snd_printk(KERN_ERR "unable to register OSS PCM device %i:%i\n",
 			   pcm->card->number, pcm->device);

sound/core/pcm.c

@@ -597,7 +597,6 @@ int snd_pcm_new_stream(struct snd_pcm *pcm, int stream, int substream_count)
 	pstr->stream = stream;
 	pstr->pcm = pcm;
 	pstr->substream_count = substream_count;
-	pstr->reg = &snd_pcm_reg[stream];
 	if (substream_count > 0) {
 		err = snd_pcm_stream_proc_init(pstr);
 		if (err < 0) {
@@ -897,7 +896,10 @@ static int snd_pcm_dev_register(struct snd_device *device)
 			devtype = SNDRV_DEVICE_TYPE_PCM_CAPTURE;
 			break;
 		}
-		if ((err = snd_register_device(devtype, pcm->card, pcm->device, pcm->streams[cidx].reg, str)) < 0) {
+		if ((err = snd_register_device(devtype, pcm->card,
+					       pcm->device,
+					       &snd_pcm_f_ops[cidx], str)) < 0)
+		{
 			snd_pcm_devices[idx] = NULL;
 			up(&register_mutex);
 			return err;

sound/core/pcm_native.c

@@ -3370,40 +3370,29 @@ static int snd_pcm_hw_params_old_user(struct snd_pcm_substream *substream,
  *  Register section
  */
 
-static struct file_operations snd_pcm_f_ops_playback = {
-	.owner =	THIS_MODULE,
-	.write =	snd_pcm_write,
-	.writev =	snd_pcm_writev,
-	.open =		snd_pcm_open,
-	.release =	snd_pcm_release,
-	.poll =		snd_pcm_playback_poll,
-	.unlocked_ioctl =	snd_pcm_playback_ioctl,
-	.compat_ioctl = snd_pcm_ioctl_compat,
-	.mmap =		snd_pcm_mmap,
-	.fasync =	snd_pcm_fasync,
-};
-
-static struct file_operations snd_pcm_f_ops_capture = {
-	.owner =	THIS_MODULE,
-	.read =		snd_pcm_read,
-	.readv =	snd_pcm_readv,
-	.open =		snd_pcm_open,
-	.release =	snd_pcm_release,
-	.poll =		snd_pcm_capture_poll,
-	.unlocked_ioctl =	snd_pcm_capture_ioctl,
-	.compat_ioctl = snd_pcm_ioctl_compat,
-	.mmap =		snd_pcm_mmap,
-	.fasync =	snd_pcm_fasync,
-};
-
-struct snd_minor snd_pcm_reg[2] =
-{
+struct file_operations snd_pcm_f_ops[2] = {
 	{
-		.comment =	"digital audio playback",
-		.f_ops =	&snd_pcm_f_ops_playback,
+		.owner =		THIS_MODULE,
+		.write =		snd_pcm_write,
+		.writev =		snd_pcm_writev,
+		.open =			snd_pcm_open,
+		.release =		snd_pcm_release,
+		.poll =			snd_pcm_playback_poll,
+		.unlocked_ioctl =	snd_pcm_playback_ioctl,
+		.compat_ioctl = 	snd_pcm_ioctl_compat,
+		.mmap =			snd_pcm_mmap,
+		.fasync =		snd_pcm_fasync,
 	},
 	{
-		.comment =	"digital audio capture",
-		.f_ops =	&snd_pcm_f_ops_capture,
+		.owner =		THIS_MODULE,
+		.read =			snd_pcm_read,
+		.readv =		snd_pcm_readv,
+		.open =			snd_pcm_open,
+		.release =		snd_pcm_release,
+		.poll =			snd_pcm_capture_poll,
+		.unlocked_ioctl =	snd_pcm_capture_ioctl,
+		.compat_ioctl = 	snd_pcm_ioctl_compat,
+		.mmap =			snd_pcm_mmap,
+		.fasync =		snd_pcm_fasync,
 	}
 };

sound/core/rawmidi.c

@@ -1367,12 +1367,6 @@ static struct file_operations snd_rawmidi_f_ops =
 	.compat_ioctl =	snd_rawmidi_ioctl_compat,
 };
 
-static struct snd_minor snd_rawmidi_reg =
-{
-	.comment =	"raw midi",
-	.f_ops =	&snd_rawmidi_f_ops,
-};
-
 static int snd_rawmidi_alloc_substreams(struct snd_rawmidi *rmidi,
 					struct snd_rawmidi_str *stream,
 					int direction,
@@ -1516,7 +1510,7 @@ static int snd_rawmidi_dev_register(struct snd_device *device)
 	sprintf(name, "midiC%iD%i", rmidi->card->number, rmidi->device);
 	if ((err = snd_register_device(SNDRV_DEVICE_TYPE_RAWMIDI,
 				       rmidi->card, rmidi->device,
-				       &snd_rawmidi_reg, name)) < 0) {
+				       &snd_rawmidi_f_ops, name)) < 0) {
 		snd_printk(KERN_ERR "unable to register rawmidi device %i:%i\n", rmidi->card->number, rmidi->device);
 		snd_rawmidi_devices[idx] = NULL;
 		up(&register_mutex);
@@ -1533,7 +1527,8 @@ static int snd_rawmidi_dev_register(struct snd_device *device)
 	rmidi->ossreg = 0;
 	if ((int)rmidi->device == midi_map[rmidi->card->number]) {
 		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
-					    rmidi->card, 0, &snd_rawmidi_reg, name) < 0) {
+					    rmidi->card, 0,
+					    &snd_rawmidi_f_ops, name) < 0) {
 			snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 0);
 		} else {
 			rmidi->ossreg++;
@@ -1544,7 +1539,8 @@ static int snd_rawmidi_dev_register(struct snd_device *device)
 	}
 	if ((int)rmidi->device == amidi_map[rmidi->card->number]) {
 		if (snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MIDI,
-					    rmidi->card, 1, &snd_rawmidi_reg, name) < 0) {
+					    rmidi->card, 1,
+					    &snd_rawmidi_f_ops, name) < 0) {
 			snd_printk(KERN_ERR "unable to register OSS rawmidi device %i:%i\n", rmidi->card->number, 1);
 		} else {
 			rmidi->ossreg++;

sound/core/seq/oss/seq_oss.c

@@ -217,11 +217,6 @@ static struct file_operations seq_oss_f_ops =
 	.compat_ioctl =	odev_ioctl_compat,
 };
 
-static struct snd_minor seq_oss_reg = {
-	.comment =	"sequencer",
-	.f_ops =	&seq_oss_f_ops,
-};
-
 static int __init
 register_device(void)
 {
@@ -230,7 +225,7 @@ register_device(void)
 	down(&register_mutex);
 	if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER,
 					  NULL, 0,
-					  &seq_oss_reg,
+					  &seq_oss_f_ops,
 					  SNDRV_SEQ_OSS_DEVNAME)) < 0) {
 		snd_printk(KERN_ERR "can't register device seq\n");
 		up(&register_mutex);
@@ -238,7 +233,7 @@ register_device(void)
 	}
 	if ((rc = snd_register_oss_device(SNDRV_OSS_DEVICE_TYPE_MUSIC,
 					  NULL, 0,
-					  &seq_oss_reg,
+					  &seq_oss_f_ops,
 					  SNDRV_SEQ_OSS_DEVNAME)) < 0) {
 		snd_printk(KERN_ERR "can't register device music\n");
 		snd_unregister_oss_device(SNDRV_OSS_DEVICE_TYPE_SEQUENCER, NULL, 0);

sound/core/seq/seq_clientmgr.c

@@ -2520,13 +2520,6 @@ static struct file_operations snd_seq_f_ops =
 	.compat_ioctl =	snd_seq_ioctl_compat,
 };
 
-static struct snd_minor snd_seq_reg =
-{
-	.comment =	"sequencer",
-	.f_ops =	&snd_seq_f_ops,
-};
-
-
 /* 
  * register sequencer device 
  */
@@ -2537,7 +2530,8 @@ int __init snd_sequencer_device_init(void)
 	if (down_interruptible(&register_mutex))
 		return -ERESTARTSYS;
 
-	if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0, &snd_seq_reg, "seq")) < 0) {
+	if ((err = snd_register_device(SNDRV_DEVICE_TYPE_SEQUENCER, NULL, 0,
+				       &snd_seq_f_ops, "seq")) < 0) {
 		up(&register_mutex);
 		return err;
 	}

sound/core/sound.c

@@ -195,7 +195,7 @@ static int snd_kernel_minor(int type, struct snd_card *card, int dev)
  * @type: the device type, SNDRV_DEVICE_TYPE_XXX
  * @card: the card instance
  * @dev: the device index
- * @reg: the struct snd_minor record
+ * @f_ops: the file operations
  * @name: the device file name
  *
  * Registers an ALSA device file for the given card.
@@ -203,7 +203,8 @@ static int snd_kernel_minor(int type, struct snd_card *card, int dev)
  *
  * Retrurns zero if successful, or a negative error code on failure.
  */
-int snd_register_device(int type, struct snd_card *card, int dev, struct snd_minor * reg, const char *name)
+int snd_register_device(int type, struct snd_card *card, int dev,
+			struct file_operations *f_ops, const char *name)
 {
 	int minor = snd_kernel_minor(type, card, dev);
 	struct snd_minor *preg;
@@ -212,12 +213,13 @@ int snd_register_device(int type, struct snd_card *card, int dev, struct snd_min
 	if (minor < 0)
 		return minor;
 	snd_assert(name, return -EINVAL);
-	preg = kmalloc(sizeof(struct snd_minor) + strlen(name) + 1, GFP_KERNEL);
+	preg = kzalloc(sizeof(struct snd_minor) + strlen(name) + 1, GFP_KERNEL);
 	if (preg == NULL)
 		return -ENOMEM;
-	*preg = *reg;
 	preg->number = minor;
+	preg->type = type;
 	preg->device = dev;
+	preg->f_ops = f_ops;
 	strcpy(preg->name, name);
 	down(&sound_mutex);
 	if (snd_minor_search(minor)) {
@@ -276,6 +278,28 @@ int snd_unregister_device(int type, struct snd_card *card, int dev)
 
 static struct snd_info_entry *snd_minor_info_entry = NULL;
 
+static const char *snd_device_type_name(int type)
+{
+	switch (type) {
+	case SNDRV_DEVICE_TYPE_CONTROL:
+		return "control";
+	case SNDRV_DEVICE_TYPE_HWDEP:
+		return "hardware dependent";
+	case SNDRV_DEVICE_TYPE_RAWMIDI:
+		return "raw midi";
+	case SNDRV_DEVICE_TYPE_PCM_PLAYBACK:
+		return "digital audio playback";
+	case SNDRV_DEVICE_TYPE_PCM_CAPTURE:
+		return "digital audio capture";
+	case SNDRV_DEVICE_TYPE_SEQUENCER:
+		return "sequencer";
+	case SNDRV_DEVICE_TYPE_TIMER:
+		return "timer";
+	default:
+		return "?";
+	}
+}
+
 static void snd_minor_info_read(struct snd_info_entry *entry, struct snd_info_buffer *buffer)
 {
 	int card, device;
@@ -288,11 +312,11 @@ static void snd_minor_info_read(struct snd_info_entry *entry, struct snd_info_bu
 			mptr = list_entry(list, struct snd_minor, list);
 			if (SNDRV_MINOR_DEVICE(mptr->number) != SNDRV_MINOR_GLOBAL) {
 				if ((device = mptr->device) >= 0)
-					snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, device, mptr->comment);
+					snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, device, snd_device_type_name(mptr->type));
 				else
-					snd_iprintf(buffer, "%3i: [%i]   : %s\n", mptr->number, card, mptr->comment);
+					snd_iprintf(buffer, "%3i: [%i]   : %s\n", mptr->number, card, snd_device_type_name(mptr->type));
 			} else {
-				snd_iprintf(buffer, "%3i:       : %s\n", mptr->number, mptr->comment);
+				snd_iprintf(buffer, "%3i:       : %s\n", mptr->number, snd_device_type_name(mptr->type));
 			}
 		}
 	}

sound/core/sound_oss.c

@@ -91,7 +91,7 @@ static int snd_oss_kernel_minor(int type, struct snd_card *card, int dev)
 }
 
 int snd_register_oss_device(int type, struct snd_card *card, int dev,
-			    struct snd_minor * reg, const char *name)
+			    struct file_operations *f_ops, const char *name)
 {
 	int minor = snd_oss_kernel_minor(type, card, dev);
 	int minor_unit;
@@ -103,12 +103,13 @@ int snd_register_oss_device(int type, struct snd_card *card, int dev,
 
 	if (minor < 0)
 		return minor;
-	preg = (struct snd_minor *)kmalloc(sizeof(struct snd_minor), GFP_KERNEL);
+	preg = kzalloc(sizeof(struct snd_minor), GFP_KERNEL);
 	if (preg == NULL)
 		return -ENOMEM;
-	*preg = *reg;
 	preg->number = minor;
+	preg->type = type;
 	preg->device = dev;
+	preg->f_ops = f_ops;
 	down(&sound_oss_mutex);
 	list_add_tail(&preg->list, &snd_oss_minors_hash[cidx]);
 	minor_unit = SNDRV_MINOR_OSS_DEVICE(minor);
@@ -125,11 +126,12 @@ int snd_register_oss_device(int type, struct snd_card *card, int dev,
 	}
 	if (card)
 		carddev = card->dev;
-	register1 = register_sound_special_device(reg->f_ops, minor, carddev);
+	register1 = register_sound_special_device(f_ops, minor, carddev);
 	if (register1 != minor)
 		goto __end;
 	if (track2 >= 0) {
-		register2 = register_sound_special_device(reg->f_ops, track2, carddev);
+		register2 = register_sound_special_device(f_ops, track2,
+							  carddev);
 		if (register2 != track2)
 			goto __end;
 	}
@@ -190,6 +192,25 @@ int snd_unregister_oss_device(int type, struct snd_card *card, int dev)
 
 static struct snd_info_entry *snd_minor_info_oss_entry = NULL;
 
+static const char *snd_oss_device_type_name(int type)
+{
+	switch (type) {
+	case SNDRV_OSS_DEVICE_TYPE_MIXER:
+		return "mixer";
+	case SNDRV_OSS_DEVICE_TYPE_SEQUENCER:
+	case SNDRV_OSS_DEVICE_TYPE_MUSIC:
+		return "sequencer";
+	case SNDRV_OSS_DEVICE_TYPE_PCM:
+		return "digital audio";
+	case SNDRV_OSS_DEVICE_TYPE_MIDI:
+		return "raw midi";
+	case SNDRV_OSS_DEVICE_TYPE_DMFM:
+		return "hardware dependent";
+	default:
+		return "?";
+	}
+}
+
 static void snd_minor_info_oss_read(struct snd_info_entry *entry,
 				    struct snd_info_buffer *buffer)
 {
@@ -205,9 +226,9 @@ static void snd_minor_info_oss_read(struct snd_info_entry *entry,
 		        if (dev != SNDRV_MINOR_OSS_SNDSTAT &&
 			    dev != SNDRV_MINOR_OSS_SEQUENCER &&
 			    dev != SNDRV_MINOR_OSS_MUSIC)
-				snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, dev, mptr->comment);
+				snd_iprintf(buffer, "%3i: [%i-%2i]: %s\n", mptr->number, card, dev, snd_oss_device_type_name(mptr->type));
 			else
-				snd_iprintf(buffer, "%3i:       : %s\n", mptr->number, mptr->comment);
+				snd_iprintf(buffer, "%3i:       : %s\n", mptr->number, snd_oss_device_type_name(mptr->type));
 		}
 	}
 	up(&sound_oss_mutex);

sound/core/timer.c

@@ -1924,12 +1924,6 @@ static struct file_operations snd_timer_f_ops =
 	.fasync = 	snd_timer_user_fasync,
 };
 
-static struct snd_minor snd_timer_reg =
-{
-	.comment =	"timer",
-	.f_ops =	&snd_timer_f_ops,
-};
-
 /*
  *  ENTRY functions
  */
@@ -1959,7 +1953,7 @@ static int __init alsa_timer_init(void)
 		snd_printk(KERN_ERR "unable to register system timer (%i)\n",
 			   err);
 	if ((err = snd_register_device(SNDRV_DEVICE_TYPE_TIMER,
-					NULL, 0, &snd_timer_reg, "timer"))<0)
+				       NULL, 0, &snd_timer_f_ops, "timer")) < 0)
 		snd_printk(KERN_ERR "unable to register timer device (%i)\n",
 			   err);
 	return 0;